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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

Our Videos
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
  • Custom fasteners

    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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  • Metal Connectors

    Metal 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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  • Mechanical Shaft

    Mechanical 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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  • Custom CNC and NC machining parts

    Custom CNC and NC machining parts

    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 precision parts

    Auto precision 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 dowel pin and its function

What is dowel pin and its function

Locating pins, parts involved in limiting the degree of freedom of objects, have certain applications in some mechanical motion equipment, mainly used for position determination in two-dimensional space Locating pin, using the workpiece hole as the positioning reference, is involved in the part that restricts the degree of freedom of the object, and controls the linear movement of the object in the three axial directions of X, Y, and Z, and six free movements around the rotational movement of X, Y, and Z degree. In a mold composed of two or more parts, a pin designed to accurately position two adjacent parts of the mold. Application When the machine body is formed by connecting multiple parts, and each part needs to maintain a precise position during processing and assembly, positioning pins should be used for positioning. For example, the split box body is composed of a machine cover and a machine base, and the processing of the bearing holes on it has higher precision requirements. Therefore, in the design, two positioning pins far apart should be set on the split surface to ensure Its processing and assembly accuracy. Classification and standards According to its structure, it can be divided into: small positioning pin, fixed positioning pin, replaceable positioning pin and positioning plug. Small positioning pin. Fixed positioning pin Reasonable structure of positioning pin. In order to maintain the accuracy of the relative position between the two parts after the certificate is installed, cylindrical pins or tapered pins are often used for positioning, so higher requirements for pins and pin holes. For the convenience of processing pin holes and pins, if possible, make the pin holes as through holes as possible, as shown in Figure (a).
Control method of nonconforming product

Control method of nonconforming product

1. The purpose of nonconforming product control Prevent the unintended use or delivery of substandard products. 2. The method of controlling nonconforming product is Recognize first and then control. Control process of unqualified products 1. Identification Identify unqualified: the basis or standard for judging whether the product is qualified or not. -Product Standards —Customer requirements —Process documents -Inspection documents -Template -Explanation and advice from superiors 2. Identification Identification of inspection status —Identifies "pending" or "unqualified". —Production team: unqualified semi-finished products and raw materials should be marked with "to be processed" or "unqualified". —The inspector stamps the inspection stamp in the corresponding item column of the random card, process card or "rework order" as a "unqualified" mark. -Its role is: traceability. —Final inspection: identification of unqualified brand. Or write down (notify) unqualified phenomena, such as (leakage, cracking, few holes, wrong model, serious indentation, few processes, wrong materials, etc.). 3. Isolation Requirements: Clear separation from normal qualified products. —Red plastic tray/material box. —Special independent defective product rack. -Divide the unqualified area and place the defective products in the unqualified area. —The placement of the production area is different from that of other products to show the difference, and then pull it to the repair or rework area as required. —Regularly arrange personnel to the defective product area for confirmation and quantity registration 4. Record -Correctly record the type, batch, inspection date, inspection basis, quantity of non-conforming products, and inspection results of the unqualified products on the prescribed inspection report. —The inspection report is reviewed and approved as required. -Process: 5. Review When the amount is large, or when it has a large impact on the company's reputation and funds, it must be reviewed. (1) Incoming inspection: Disposal opinions signed by the inspection supervisor and above (if necessary, the technical department, production, supply chain, and related departments shall be organized to conduct review). (2) Process inspection: For batches of unqualified products, the Quality Management Department organizes relevant departments and relevant personnel to review. (3) Final inspection: The person in charge of the quality control department approves the disposal conclusion, and when necessary, the technical department participates in the review. 6. Disposal Including the following: selection and use, repair, concession, disposal, corrective and preventive measures. (1) Disposal of unqualified purchases —Return -Concession acceptance —Require the supplier to take relevant corrective and preventive measures -Our factory will arrange personnel to review the factory for many consecutive batches of unqualified suppliers and a large number of severely unqualified supplie...
What is plunge milling? What is its use in processing?

What is plunge milling? What is its use in processing?

Plunge milling, also known as Z-axis milling, is one of the most effective machining methods for high removal rate metal cutting. For surface machining, grooving and machining with large tool overhangs of difficult-to-machine materials, the processing efficiency of plunge milling is much higher than that of conventional end milling. In fact, when a large amount of metal material needs to be removed quickly, the plunge milling method can reduce the processing time by more than half. ▉advantage In addition, plunge milling has the following advantages: ①It can reduce the deformation of the workpiece; ②It can reduce the radial cutting force acting on the milling machine, which means that the spindle whose shaft system has been worn can still be used for plunge milling without affecting the processing quality of the workpiece; ③The tool overhang is large, This is very beneficial to the milling of the groove or surface of the workpiece; ④It can realize the grooving of high-temperature alloy materials (such as Inconel). Plunge milling is very suitable for rough machining of mold cavities and is recommended for efficient machining of aerospace parts. One of the special applications is plunge milling of turbine blades on a three-axis or four-axis milling machine. This kind of processing usually needs to be performed on a dedicated machine tool. ▉ Working principle When the turbine blade is plunge-milled, it can be milled from the top of the workpiece down to the root of the workpiece. Through simple translation of the X-Y plane, extremely complex surface geometries can be processed. When implementing plunge milling, the cutting edge of the milling cutter is formed by overlapping the profile of each blade, and the plunge milling depth can reach 250mm without vibration or distortion. The cutting motion direction of the tool relative to the workpiece can be either downward or downward. Upward, but generally cutting downward is more common. When plunge milling the inclined plane, the plunge milling cutter makes compound movement along the Z axis and X axis. In some processing occasions, spherical milling cutters, face milling cutters or other milling cutters can also be used to mill grooves, milling surfaces, milling bevels, and milling cavities. ▉ Scope of application The special plunge milling cutter is mainly used for roughing or semi-finishing. It can cut into the concave part of the workpiece or cut along the edge of the workpiece. It can also mill complex geometric shapes, including root cutting. In order to ensure a constant cutting temperature, all shank plunge milling cutters adopt internal cooling. The cutter body and insert design of the plunge milling cutter can cut into the workpiece at the best angle. Usually the cutting edge angle of the plunge milling cutter is 87° or 90°, and the feed rate ranges from 0.08 to 0.25 mm/tooth. The number of inserts clamped on each plunge milling cutter depends on the diameter of the milling cutter. For example, ...
what different is CNC & NC

what different is CNC & NC

NC (Numerical Control, digital control, referred to as numerical control) refers to the use of discrete digital information to control the operation of machinery and other devices, which can only be programmed by the operator. CNC CNC technology application   The development of CNC technology is quite rapid, which greatly improves the productivity of mold processing. Among them, the CPU with faster operation speed is the core of the development of CNC technology. The improvement of CPU is not only the improvement of operation speed, but the speed itself also involves the improvement of CNC technology in other aspects. Because of the great changes in CNC technology in recent years, it is worth a review of the current application of CNC technology in the mold manufacturing industry.       Block processing time and others Due to the increase in CPU processing speed, and CNC manufacturers applying high-speed CPUs to highly integrated CNC systems, the performance of CNC has been significantly improved. Faster and more sensitive systems achieve more than just higher program processing speed. In fact, a system that can process part machining programs at a fairly high speed may also behave like a low-speed processing system during operation, because even a fully functional CNC system has some potential problems that may become limitations The bottleneck of processing speed.   At present, most mold factories realize that high-speed machining requires more than short processing time. In many ways, this situation is very similar to driving a car. Will the fastest car win the race? Even a spectator who watches the car race occasionally knows that in addition to speed, there are many factors that affect the outcome of the race.   First of all, the driver's knowledge of the track is important: he must know where there are sharp turns so that he can slow down appropriately and pass the curve safely and efficiently. In the process of processing molds with high feed speed, the to-be-processed trajectory monitoring technology in CNC can obtain the information of sharp curves in advance. This function plays the same role.   Similarly, the driver's sensitivity to other drivers' actions and uncertainties is similar to the number of servo feedbacks in the CNC. Servo feedback in CNC mainly includes position feedback, speed feedback and current feedback.   When a driver is driving around the track, the consistency of the movement, whether he can brake and accelerate skillfully, has a very important impact on the driver's performance on the spot. Similarly, the bell-shaped acceleration/deceleration and to-be-processed track monitoring functions of the CNC system use slow acceleration/deceleration instead of abrupt speed changes to ensure smooth acceleration of the machine tool.   In addition, there are other similarities between the car and the CNC system. The power of the racing engine is similar to the drive and motor of the...
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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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