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Xiamen Zhong Li Da Machinery Co., Ltd is professional in CNC machining service since 2009. Really factory with ISO9001 and IATF 16949 certification.
Xiamen Zhong Li Da Machinery Co., Ltd
Xiamen Zhong Li Da Machinery Co., Ltd. is the indirect supplier of ABB, the largest security manufacturer, Domestic power equipment manufacturing enterprises in China. Professional in processing various types of electrical performance, magnetic properties, mechanical properties, functional special plating, heat treatment and other hardware spare parts, non-standard equipment accessories, tooling, fixture, fixture design and processing.  Our company was established in 2009, located in Xiamen City, Fujian. With plant area of 1, 500 square meters; Now existing four-axis machining center, turning and milling compound center, CNC lathes, automatic lathes and other precision Production equipment. Strictly control the quality with Big QC department(IQC, IPQC, FQ). And full inspection products before shipment. Also large test room for our Metal lographic analyzer, Coordinate measuring instrument, image measurement, X-ray coating tester, Roughness measuring instrument, Salt spray machine, Hardness tester, and other testing equipment.  At the same time, the company introduced ISO9001: 2008 standard, designed to further optimize the process, standardize management; Our advantages: Processing all kinds of metal products, quality and stability, delivery on time customers. Company organization is stable with internal business, production, quality control, administration, engineering, procurement six departments.  Comprehensive training staff customer awareness, quality awareness; To ensure effective and fast to provide customers with quality products and services to win customer satisfaction. Faith in the "technology as the root, quality-oriented, reputation for a living, service for the purpose", with a number of enterprises to establish Long-term relationship. 
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  • Processing according to customer drawing
    Processing according to customer drawing
    All products are customer design
  • Stable quality
    Stable quality
    Complete quality inspection system to ensure quality
  • Delivery on time
    Delivery on time
    Samples: 3-7 days Mass production, 15 days
Our Partners
Xiamen Zhong Li Da Machinery Co., Ltd is the partner with ABB, TE connectivity and Samsung and so on famous company.

Hope to be your reliable strategic partner! Contact Us or View More Our Partners

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Xiamen Zhong Li Da Machinery Co., Ltd major business is CNC machining processing for different customized drawing/design.
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Products categories
Xiamen Zhong Li Da Machinery Co., Ltd major parts is CNC machining parts, customized special fasteners like standoff, cable connectors, standoff, precision pins, precision shaft and so on
  • Non-standard custom fasteners

    Non-standard custom fasteners

    Zhong Li Da machining  automation and control products and solutions cover the breadth of the industrial, infrastructure and building sectors -- from programmable relays to motion controllers and interface modules, for applications from simple machines to complex process systems.



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  • Connectors

    Connectors

    Product range can be tailored to produce custom solutions based on customer requests, working through a specific process leveraging engineering capability and experience of design and manufacture for harsh environments to create a product that suits a specific need.
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  • Shaft

    Shaft

    ZHONG LI DA offers a broad line of surge protection adapters and accessories used for device testing, installation and safety. All of our accessories are manufactured to rigorous quality standards from high quality materials.

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  • Electrical accessories

    Electrical accessories

    Milling service with our CNC lathe for LED Light Metal Parts, like cover, tube and so on.

    Polishing with passivation are available.

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  • Auto parts

    Auto parts

    High tolerance requested Pin with CNC machining service.

    Thread, Grinding and knurl are available.

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Hot Products
Xiamen Zhong Li Da Machinery Co., Ltd processing all kind of special fasteners, table connectors, customized precision hardware parts, shaft, standoffs and so on.
Brass Knob Cabinet Knob

Furniture Hardware Brass Hexagonal Cabinet Knob

Furniture Hardware Brass Hexagonal Cabinet Knob Unique design,Beautiful appearance,made by brass.
M3 threaded Knurled insert nuts

Knurled M4 threaded inserts nuts for plastic

Brass Knurled M4 threaded insert nuts made of brass hpb59-1 The main use is: injection molding, heating into the plastic parts or direct mold injection.
metric cable gland

Small M20 Brass Armoured Cable Gland Manufacturers

Cable glands are used to secure and connect the ends of each cable to electrical or telecommunication equipment.
Metal cable gland

Stainless Steel Explosion Proof Double Compression Emc Cable Gland Connector

Cable glands are available for all types of power, control, instrumentation, data and telecommunications cables. They are used as sealing and termination devices to ensure that the characteristics of the housing into which the cable enters are adequately maintained.
T Shaped Bronze  Bearings Bushing

T Shaped Bronze Bearings Bushing

T Shaped Bronze  Bearings Bushing offen made of bronze or brass .Generally speaking, the bushing and bearing housing adopt interference fit, while the shaft adopts clearance fit.
Brass Knob Cabinet Knob

Custom brass modern cabinet knob

Brass  modern cabinet knob made of brass ,Unique and novel design
M4 threaded  round Standoffs

M3 length 10mm Colour Anodized Round Standoff

Red anodized round Standoffs made of aluminum,all size can be customized according to customer requirements
Cabinet Knob

Polished Brass Cabinet Knob

Knobs and Pulls. These handy features are more than a means to open cabinetry.
Cabinet Knob

Custom M6-M8 brass drawer handle

Custom M6-M8 brass drawer handle These handy features are more than a means to open cabinetry.
Brass Dresser Handle For Furniture

Gold Brass Dresser Handle For Kitchen Cabinet Doors

Custom Gold Brass Dresser Handle Mount the handle on the profile for easy opening and carrying
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Applications
our products are customized according to customer technical drawings. we mainly produce non-standard precision mechanical parts. precision mechanical parts are widely used in mobile phones, televisions, computers and some small household appliances. they are also used in the fields of automobiles, mechanical equipment, communication equipment, medical equipment, aerospace and electronics.
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what is Low Speed Wire Cut

what is Low Speed Wire Cut

Low speed wire cut, also known as low-speed walking, uses continuous moving thin metal wires (called electrode wires, generally copper wires) as electrodes to perform pulsed spark discharge on the work piece, which generates high temperatures above 6000 degrees, etc. A CNC machining machine that becomes a work piece. The principle of slow wire processing is the phenomenon that there is a gap between the wire electrode and the work piece, and the electrical discharge is continuously removed. Walk slowly. Unlike CNC turning, which is suitable for processing Dowel Pins, Low speed wire cut is more suitable for irregular workpieces that require right-angle cutting. Since the Low speed wire cut machine adopts the method of continuous wire feeding of the wire electrode, that is, the wire electrode completes the processing during the movement, so even if the wire electrode is worn, it can be continuously supplemented, which can improve the processing accuracy of the part. The surface roughness of the work piece processed by the slow-feed wire cutting machine can usually reach Ra = 0.8 μm and above, and the roundness error, straight line error and dimensional error of the slow-feed wire cutting machine are much better than those of the fast-feed wire cutting machine. For high-precision parts, Low speed wire cut machines are widely used. In addition to early small and medium-sized enterprises, it is also very common in processing plants of large enterprises such as aviation, automotive, and medical. WORKING PRINCIPLE Jog wire is a machining machine that uses continuous moving thin metal wires (called electrode wires) as electrodes to perform pulse spark discharge on the work piece to remove metal and cut and form. Loose contact light pressure discharge between the wire electrode and the work piece during slow wire processing. When the flexible electrode wire and the work piece are close to the commonly considered discharge gap (for example, 8 to 10 μm), spark discharge does not occur. Even when the electrode wire has contacted the work piece and the gap is no longer visible from the microscope, it is often not visible. To the spark, a normal spark discharge occurs only when the work piece bends the electrode wire and deviates a certain distance (a few microns to several tens of microns). At this time, for each 1 μm of wire electrode feed, the discharge gap does not decrease by 1 μm, but the electrode wire increases a little tension between the wires, and the work piece increases a little lateral pressure. Obviously, only after maintaining a slight contact pressure between the electrode wire and the work piece In order to form a spark discharge. Based on this, it is believed that there is some kind of electrochemically generated insulating film medium between the electrode wire and the work piece Processing characteristics Surface Quality (1) Nanosecond high peak current pulse power technology In the EDM process, there are two types of metal erosion: meltin...
The difference between CNC lathe processing

The difference between CNC lathe processing

In the processing of parts, those small parts such as bars need to be processed at one time, and those parts need to be processed in batches. In most cases, it will be used. Pogo Pin, Brass Threaded Inserts for Plastic, 316 stainless steel dowel pins, small appliances shafts, brass cable connectors and other round symmetrical products fall into this range, as long as it involves the processing of rod-like parts, as long as the diameter of the processed part is not When the diameter is too large (the diameter cannot be greater than 52mm), the CNC lathe has great advantages in all aspects. If coupled with the matching equipment-feeder (CNC CNC PRECISION AUTOMATIC LATHE), it will generally be used for distribution. Can have a greater advantage), so in terms of this set of equipment, it is a relatively typical small automated production line, whether it is in the speed of processing parts, the molding rate of the product or the cost of the entire production, It has advantages unmatched by other machine tools. The biggest and most important difference between CNC PRECISION AUTOMATIC LATHE and the walking machine is that during the work of the walking machine, the knife moves while the workpiece does not move. CNC PRECISION AUTOMATIC LATHE has long been called a slitting machine in China. It is mainly used for batch processing of small rod-shaped parts. Most feeders pass the bar through the through hole of the spindle, and the collet is automatically clamped. If the parts that need to be processed in the processing process are protruding outward for a certain distance, then the parts need to be equipped with a tip. If the tail needs to be processed, a second spindle is required. If the machined parts need to be machined with four or six drill holes, then a power tool holder and spindle indexing are needed. For CNC PRECISION AUTOMATIC LATHE, the biggest limitation is the limitation of the rod material diameter. At present, the largest type of center lathe can only process parts with a diameter of 50 mm. As long as it is a part that can be machined by CNC PRECISION AUTOMATIC LATHE, its machining accuracy, machining speed, and cutting machine can't match it. There are a lot of CNC PRECISION AUTOMATIC LATHE, but its main advantage is that one time clamping of the part can cut the part up to 200mm in length without stopping the spindle. If you need to process a relatively small part (10mm), both CNC PRECISION AUTOMATIC LATHE and the cutter can be used, but CNC PRECISION AUTOMATIC LATHE can do a lot of this small part without stopping the spindle, but the cutter cannot . The cutting position of CNC PRECISION AUTOMATIC LATHE in the cutting process is always the nearest position where the part is fixed, so the rigidity is very good. The cutter can process more complex and irregular parts. For some flat plate seats that require grooves, the irregular and asymmetric CNC machining part cutter is more suitable than the CNC PRECISION AUTOMATIC LATHE. Zhonglida mach...
Plain bearing bushing Common considerations

Plain bearing bushing Common considerations

In the moving parts, the parts are worn due to long-term friction. When the clearance between the shaft and the hole wears to a certain extent, the parts must be replaced. Therefore, the designer chooses a lower hardness and better wear resistance when designing. The material is a shaft sleeve or a bushing, which can reduce the wear of the shaft and the seat. When the shaft sleeve or the bushing is worn to a certain extent, it can be replaced. This can save the cost of replacing the shaft or the seat. Generally, the bushing and the seat are used. Interference fit, and clearance fit with the shaft, because wear is unavoidable in any case, can only extend the life, and shaft parts are relatively easy to process; some new designers do not like this design, think that It is an increase in cost during manufacture, but after a period of use, it is still necessary to modify it in accordance with this method. However, the modification is likely to reduce the accuracy of the equipment. The reason is simple. Secondary processing cannot guarantee the position of the center of the seat hole. In addition, the bushing is used to replace rolling bearings (such as camshafts) in places with low speed, high radial load and high clearance requirements (actually, the bushing is also considered as a plain bearing). The material requires low hardness and resistance Grinding, the inner hole of the shaft sleeve can be ground and scraped to achieve high matching accuracy. There must be an oil groove on the inner wall. Lubrication of the shaft sleeve is very important. If dry grinding, the shaft and shaft sleeve will be scrapped quickly. Recommended here Scrap the inner hole wall of the sleeve during installation, which can leave many small pits and enhance lubrication 1. Plain bearing bushing generally function as sliding bearings. In order to save material, the wall thickness of the sleeve is designed according to the axial load required by the bearing. Generally, cast copper and bearing alloy materials are used. The shaft sleeve is divided into open and non-open, which depends on the needs of the structure. Generally, the sleeve cannot bear axial load, or can only bear small axial load. Or add thrust bearings. The shaft is generally round. 2.Bushings generally function as linings. The shaft can be of various shapes, as is the bushing. Bushings can be used to prevent corrosion, eliminate assembly gaps, etc. The shaft sleeve generally plays the role of axial positioning, and the end is in contact with the gear bearing and other parts under compressive stress. Sometimes the shaft must be matched with seals and other standard parts, and it is necessary to ensure that the middle part can pass through the shaft end. The shaft sleeve and seal ring can be made thin to ensure that the parts pass through. Plain bearing bushing have different uses in different occasions, can be axially positioned, can reduce friction and vibration, and can also be used to isolate the shaft from h...
Flange (tool part)

Flange (tool part)

Flange (tool part) Flange (Flange), also known as flange flange or flange. The flange is a part that connects the shaft and the shaft, and is used for the connection between the pipe ends. It is also used in the equipment inlet and outlet for the connection between two devices, such as the reducer flange. The flange connection or flange joint refers to a detachable connection in which a flange, a gasket and a bolt are connected to each other as a group of combined sealing structures. Pipe flange refers to the flange used for piping in pipeline installations, and used on equipment refers to the inlet and outlet flanges of equipment. There are holes in the flange, and the bolts tightly connect the two flanges. The flanges are sealed with gaskets. Flange is divided into threaded connection (thread connection) flange, welding flange and clip flange. The flanges are used in pairs. Wire joint flanges can be used for low pressure pipelines, and welded flanges can be used for pressures above 4 kg. Add a gasket between the two flanges and tighten with bolts. Different pressure flanges have different thicknesses, and they use different bolts. When pumps and valves are connected to pipelines, the parts of these equipment and equipment are also made into corresponding flange shapes, also known as flange connections. Any connection parts that are bolted at the periphery of two planes and closed at the same time are generally referred to as "flange", such as the connection of ventilation ducts, this type of parts can be called "flange parts". However, this connection is only a part of the equipment, such as the connection between the flange and the water pump, it is difficult to call the water pump a "flange-type part". Relatively small ones, such as valves, can be called "flange parts". Reducer flange, used to connect the motor and the reducer, and the connection between the reducer and other equipment. Flange connection is to fix two pipes, pipe fittings or equipment respectively on a flange plate first, and add flange pads between the two flange plates, and fasten them with bolts to complete the connection. . Some pipe fittings and equipment already have flanges, which are also flange connections. Flange connection is an important connection method for pipeline construction. The flange connection is easy to use and can withstand large pressures. In industrial piping, in the home, the diameter of the pipe is small and the pressure is low, and the flange connection is not visible. If in a boiler room or production site, flanged pipes and equipment are everywhere. [1] According to the connection method, the flange connection types can be divided into: plate type flat welding flange, neck flat welding flange, neck welding flange, socket welding flange, thread flange, flange cover, neck welding ring Loose sleeve flange, flat welding ring loose sleeve flange, ring groove surface flange and flange cover, large diameter flat flange, large diameter high neck flange,...
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How Zhonglida Machinery develop in 2020

How Zhonglida Machinery develop in 2020

Made in China is gradually upgrading, and Zhonglida Machinery is also participating in this wave. Gradually developed from several automatic lathes to now have 20 CNC machining centers, 30 automatic lathes, more than 20 auxiliary processing and testing equipment. For products that are simple and cheap, people tend to buy them nearby or in their own country. Because long-distance transportation and product import both cost, if the product is cheap, the cost of transportation and import may have exceeded the price purchased nearby. But why are more and more people importing machined hardware products from China? After several upgrades, Chinese industry has become one of the important members of global manufacturing. The reason why she can develop rapidly and continue to be inseparable from the increasingly perfect domestic supply chain system Customers' needs often require multiple factories to collaborate, and even cross-industry cooperation to complete. If the customer needs to find the factory for each processing technology and find the appropriate assembly factory, it will take a lot of time, energy and cost. But if you find an experienced and powerful factory, it already has a perfect network of relationships, and cooperates with other supporting factories for many years to cooperate perfectly. This will save customers a lot of unnecessary costs. Xiamen Zhonglida Machinery Co., Ltd. has been continuously screened since its establishment in 2005, and has already established a complete supporting supply chain system that has been subsequently processed. Able to provide customers with all services of finished hardware parts from raw materials to qualified products after understanding their needs. The steps are simplified as follows: make a request → confirm the drawing → confirm the sample → pay → receive the goods. Strong processing equipment, processing capacity and perfect management system, after passing ISO9001: 2016 and TS16949 certification, we provide many large factories including but not limited to custom screws, custom nuts, various shafts, shaft sleeves, engine spools Electromagnetic parts, Cable Gland Adaptor and other OEM stainless steel, iron, copper, aluminum, carbon steel, low carbon steel and non-metal parts. Made in China is gradually upgrading, and Zhonglida Machinery is also participating in this wave. Gradually developed from several automatic lathes to now have 20 CNC machining centers, 30 automatic lathes, more than 20 auxiliary processing and testing equipment. For products that are simple and cheap, people tend to buy them nearby or in their own country. Because long-distance transportation and product import both cost, if the product is cheap, the cost of transportation and import may have exceeded the price purchased nearby. But why are more and more people importing machined hardware products from China? After several upgrades, Chinese industry has become one of the important members of global manufacturing. The reaso...
Apr 30, 2020
Pin shaft commonly used materials

Pin shaft commonly used materials

pin shafts are a type of standardized fasteners that can be fixedly connected statically or moved relative to the connected part. They are mainly used at the hinge of two parts to form a hinge connection. The pin shaft is usually locked with a split pin shaft, which is reliable and easy to disassemble. The international standard for pin shafts is ISO 2341: 1986. Chinese standard GB / T882-2008 . Common materials C45(1.0503) The GB / T699-1999 standard stipulates that the 45 steel has a tensile strength of 600 MPa, a yield strength of 355 MPa, an elongation of 16%, a section shrinkage of 40%, and an impact energy of 39. C45 steel is a common material for shaft parts. It is cheap and can be obtained after quenching and tempering (or normalizing). It can also obtain comprehensive mechanical properties such as high strength and toughness. The surface hardness after quenching can be Up to 45 ~ 52HRC. 40Cr and other alloy structural steels are suitable for medium-precision and high-speed shaft parts. After tempering and quenching, this type of steel has good comprehensive mechanical properties. motor shaft extension coupler. C45 steel (DIN EN C45 / JIS S45C / ASTM 1045) is widely used in machinery manufacturing, and its mechanical properties are very good. But this is a medium carbon steel, the quenching performance is not good, 45 steel can be hardened to HRC42 ~ 46. Therefore, if the surface hardness is required, and the superior mechanical properties of 45 # steel are desired, the surface of 45 # steel is often quenched (high-frequency quenching or direct quenching), so that the required surface hardness can be obtained. 2, 40Cr 40Cr is a commonly used material for shaft parts. It is cheap and can be obtained after quenching and tempering (or normalizing). It can also obtain comprehensive mechanical properties such as high strength and toughness. The surface hardness after quenching can reach 45 ~ 52HRC. 40Cr and other alloy structural steels are suitable for medium-precision and high-speed shaft parts. After quenching and tempering, this type of steel has good comprehensive mechanical properties. 40Cr is China's GB standard steel number. 40Cr steel is one of the most widely used steels in machinery manufacturing. After quenched and tempered, it has good comprehensive mechanical properties, good low temperature impact toughness and low notch sensitivity. Steel has good hardenability. It can be hardened to Ф28 ~ 60mm when water quenched, and Φ15 ~ 40mm when oil quenched. In addition to quenching and tempering, this steel is also suitable for cyanidation and induction hardening. The cutting performance is good. When the hardness is HB174 ~ 229, the relative cutting workability is 60%. 3, 30CrMnTi It has higher strength and hardenability than 20CrMnTi steel, but its impact toughness is slightly lower. It is mainly used as carburizing steel. After carburizing, it can be directly quenched by lowering the tempe...
Jan 08, 2020
Machining of shaft parts

Machining of shaft parts

Shaft parts In industrial products, shaft parts are suitable for one or more CNC machined parts maintenance operations. Shaft parts are one of the typical parts often encountered in hardware accessories. It is mainly used to support transmission parts, transmit torque and bear loads. According to the structure of shaft parts, they can be divided into optical shafts, stepped shafts and special shapes. Three types of shafts; or solid shafts and hollow shafts. Surface roughness Ra2.5 ~ 0.63μm Radial runout 0.01 ~ 0.03mm Processing diameter 42mm Non-standard shaft parts batch processing equipment Shaft parts are one of the typical parts often encountered in hardware accessories. It is mainly used to support transmission parts, transmit torque and bear loads. According to the structure of shaft parts, they can be divided into optical shafts, stepped shafts and special shapes. Three types of shafts; or solid shafts and hollow shafts. They are used in machines to support transmission parts such as gears, belt wheels, etc. to transmit torque or motion. Shaft parts are rotating parts, whose length is greater than the diameter, and are generally composed of the outer cylindrical surface, conical surface, inner hole and thread of the concentric shaft and the corresponding end surface. According to different structural shapes, shaft parts can be divided into optical axis, stepped shaft, hollow shaft and crankshaft. A shaft with an aspect ratio of less than 5 is called a short shaft, and a shaft with an aspect ratio of more than 20 is called an slender shaft. Most shafts are in between. The shaft is supported by a bearing, and the shaft section that cooperates with the bearing is called a journal. Journals are shaft assembly standards, and their accuracy and surface quality are generally high. Technical requirements are generally based on the main functions and working conditions of the shaft. Generally, there are the following: (a) Surface roughness Generally, the surface roughness of the shaft diameter matched with the transmission is Ra2.5 ~ 0.63μm, and the surface roughness of the support shaft diameter matched with the bearing is Ra0.63 ~ 0.16μm. Zhonglida Machinery Co., Ltd. can process a surface finish of Ra0.05μm. (b) mutual position accuracy The position accuracy requirements of shaft parts are mainly determined by the position and function of the shaft in the machine. Normally, the coaxiality of the bearing assembly journal to the support journal should be guaranteed, otherwise it will affect the transmission precision of the transmission member (gear, etc.) and generate noise. For a normal-precision shaft, the radial runout of the supporting shaft journal to the supporting journal is generally 0.01 ~ 0.03mm, and the high-precision shaft (such as the main shaft) is usually 0.001 ~ 0.005mm. (c) Geometry accuracy The geometric accuracy of shaft parts mainly refers to the roundness and cylindricity of the journal, outer tapered surface, Morse taper, et...
Dec 30, 2019
  • 30

    Apr, 2020

    How Zhonglida Machinery develop in 2020

    Made in China is gradually upgrading, and Zhonglida Machinery is also participating in this wave. Gradually developed from several automatic lathes to now have 20 CNC machining centers, 30 automatic lathes, more than 20 auxiliary processing and testing equipment. For products that are simple and cheap, people tend to buy them nearby or in their own country. Because long-distance transportation and product import both cost, if the product is cheap, the cost of transportation and import may have exceeded the price purchased nearby. But why are more and more people importing machined hardware products from China? After several upgrades, Chinese industry has become one of the important members of global manufacturing. The reason why she can develop rapidly and continue to be inseparable from the increasingly perfect domestic supply chain system Customers' needs often require multiple factories to collaborate, and even cross-industry cooperation to complete. If the customer needs to find the factory for each processing technology and find the appropriate assembly factory, it will take a lot of time, energy and cost. But if you find an experienced and powerful factory, it already has a perfect network of relationships, and cooperates with other supporting factories for many years to cooperate perfectly. This will save customers a lot of unnecessary costs. Xiamen Zhonglida Machinery Co., Ltd. has been continuously screened since its establishment in 2005, and has already established a complete supporting supply chain system that has been subsequently processed. Able to provide customers with all services of finished hardware parts from raw materials to qualified products after understanding their needs. The steps are simplified as follows: make a request → confirm the drawing → confirm the sample → pay → receive the goods. Strong processing equipment, processing capacity and perfect management system, after passing ISO9001: 2016 and TS16949 certification, we provide many large factories including but not limited to custom screws, custom nuts, various shafts, shaft sleeves, engine spools Electromagnetic parts, Cable Gland Adaptor and other OEM stainless steel, iron, copper, aluminum, carbon steel, low carbon steel and non-metal parts. Made in China is gradually upgrading, and Zhonglida Machinery is also participating in this wave. Gradually developed from several automatic lathes to now have 20 CNC machining centers, 30 automatic lathes, more than 20 auxiliary processing and testing equipment. For products that are simple and cheap, people tend to buy them nearby or in their own country. Because long-distance transportation and product import both cost, if the product is cheap, the cost of transportation and import may have exceeded the price purchased nearby. But why are more and more people importing machined hardware products from China? After several upgrades, Chinese industry has become one of the important members of global manufacturing. The reaso...
  • 08

    Jan, 2020

    Pin shaft commonly used materials

    pin shafts are a type of standardized fasteners that can be fixedly connected statically or moved relative to the connected part. They are mainly used at the hinge of two parts to form a hinge connection. The pin shaft is usually locked with a split pin shaft, which is reliable and easy to disassemble. The international standard for pin shafts is ISO 2341: 1986. Chinese standard GB / T882-2008 . Common materials C45(1.0503) The GB / T699-1999 standard stipulates that the 45 steel has a tensile strength of 600 MPa, a yield strength of 355 MPa, an elongation of 16%, a section shrinkage of 40%, and an impact energy of 39. C45 steel is a common material for shaft parts. It is cheap and can be obtained after quenching and tempering (or normalizing). It can also obtain comprehensive mechanical properties such as high strength and toughness. The surface hardness after quenching can be Up to 45 ~ 52HRC. 40Cr and other alloy structural steels are suitable for medium-precision and high-speed shaft parts. After tempering and quenching, this type of steel has good comprehensive mechanical properties. motor shaft extension coupler. C45 steel (DIN EN C45 / JIS S45C / ASTM 1045) is widely used in machinery manufacturing, and its mechanical properties are very good. But this is a medium carbon steel, the quenching performance is not good, 45 steel can be hardened to HRC42 ~ 46. Therefore, if the surface hardness is required, and the superior mechanical properties of 45 # steel are desired, the surface of 45 # steel is often quenched (high-frequency quenching or direct quenching), so that the required surface hardness can be obtained. 2, 40Cr 40Cr is a commonly used material for shaft parts. It is cheap and can be obtained after quenching and tempering (or normalizing). It can also obtain comprehensive mechanical properties such as high strength and toughness. The surface hardness after quenching can reach 45 ~ 52HRC. 40Cr and other alloy structural steels are suitable for medium-precision and high-speed shaft parts. After quenching and tempering, this type of steel has good comprehensive mechanical properties. 40Cr is China's GB standard steel number. 40Cr steel is one of the most widely used steels in machinery manufacturing. After quenched and tempered, it has good comprehensive mechanical properties, good low temperature impact toughness and low notch sensitivity. Steel has good hardenability. It can be hardened to Ф28 ~ 60mm when water quenched, and Φ15 ~ 40mm when oil quenched. In addition to quenching and tempering, this steel is also suitable for cyanidation and induction hardening. The cutting performance is good. When the hardness is HB174 ~ 229, the relative cutting workability is 60%. 3, 30CrMnTi It has higher strength and hardenability than 20CrMnTi steel, but its impact toughness is slightly lower. It is mainly used as carburizing steel. After carburizing, it can be directly quenched by lowering the tempe...
  • 30

    Dec, 2019

    Machining of shaft parts

    Shaft parts In industrial products, shaft parts are suitable for one or more CNC machined parts maintenance operations. Shaft parts are one of the typical parts often encountered in hardware accessories. It is mainly used to support transmission parts, transmit torque and bear loads. According to the structure of shaft parts, they can be divided into optical shafts, stepped shafts and special shapes. Three types of shafts; or solid shafts and hollow shafts. Surface roughness Ra2.5 ~ 0.63μm Radial runout 0.01 ~ 0.03mm Processing diameter 42mm Non-standard shaft parts batch processing equipment Shaft parts are one of the typical parts often encountered in hardware accessories. It is mainly used to support transmission parts, transmit torque and bear loads. According to the structure of shaft parts, they can be divided into optical shafts, stepped shafts and special shapes. Three types of shafts; or solid shafts and hollow shafts. They are used in machines to support transmission parts such as gears, belt wheels, etc. to transmit torque or motion. Shaft parts are rotating parts, whose length is greater than the diameter, and are generally composed of the outer cylindrical surface, conical surface, inner hole and thread of the concentric shaft and the corresponding end surface. According to different structural shapes, shaft parts can be divided into optical axis, stepped shaft, hollow shaft and crankshaft. A shaft with an aspect ratio of less than 5 is called a short shaft, and a shaft with an aspect ratio of more than 20 is called an slender shaft. Most shafts are in between. The shaft is supported by a bearing, and the shaft section that cooperates with the bearing is called a journal. Journals are shaft assembly standards, and their accuracy and surface quality are generally high. Technical requirements are generally based on the main functions and working conditions of the shaft. Generally, there are the following: (a) Surface roughness Generally, the surface roughness of the shaft diameter matched with the transmission is Ra2.5 ~ 0.63μm, and the surface roughness of the support shaft diameter matched with the bearing is Ra0.63 ~ 0.16μm. Zhonglida Machinery Co., Ltd. can process a surface finish of Ra0.05μm. (b) mutual position accuracy The position accuracy requirements of shaft parts are mainly determined by the position and function of the shaft in the machine. Normally, the coaxiality of the bearing assembly journal to the support journal should be guaranteed, otherwise it will affect the transmission precision of the transmission member (gear, etc.) and generate noise. For a normal-precision shaft, the radial runout of the supporting shaft journal to the supporting journal is generally 0.01 ~ 0.03mm, and the high-precision shaft (such as the main shaft) is usually 0.001 ~ 0.005mm. (c) Geometry accuracy The geometric accuracy of shaft parts mainly refers to the roundness and cylindricity of the journal, outer tapered surface, Morse taper, et...
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