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Xiamen Zhong Li Da Machinery Co., Ltd is professional in CNC machining service since 2009. Really factory with ISO9001 and ITAF 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
  • Industrial Control Switch Hardware

    Industrial Control Switch Hardware

    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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  • Electrical Accessories

    Electrical Accessories

    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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  • LED Light Metal Parts

    LED Light Metal 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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  • Furniture Hardware

    Furniture Hardware

    High-end furniture hardware accessories


    High entrance furniture hardware with CNC machining service with good-looking.


    For chair , desk and table so on.

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  • High precision Pin

    High precision Pin

    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.
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
Bathroom door knob

Bathroom door knob with bright chrome plated

Bathroom door knob with bright chrome plated is an indispensable functional accessory for home improvement。
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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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Tungsten disulfide powder as lubricant coating

Tungsten disulfide powder as lubricant coating

Tungsten disulfide powder as lubricant coating Tungsten disulfide powder can be sprayed on the surface of the substrate by dry cold air under 0.8Mpa (120psi) pressure. Spraying can be performed at room temperature and the coating is 0.5 micron thick. Alternatively, the powder is mixed with isopropanol to apply a sticky substance to the substrate. At present, tungsten disulfide coating has been used in many fields, such as automotive parts, racing engine parts, aviation parts, bearings, shafts, deep-sea vehicles, cutting tools, blades, cutting tools, knives, mold release, high-precision bearings, Valve components, pistons, chains, etc. In addition, tungsten disulfide is also used as a colored brush in the carbon industry. It can also be applied to super-hard materials and welding wire materials. Tungsten disulfide can completely replace molybdenum disulfide, with comparable price, better quality and stronger performance. In addition, due to the extremely low friction coefficient (0.03 under dynamic and 0.07 under static) of tungsten disulfide powder, its application field is infinitely broad. Anything is possible if you want to get it.
Which products can be processed by CNC machining center

Which products can be processed by CNC machining center

Which products can be processed by CNC machining center 1. Which products can be processed by CNC machining center Machining centers are suitable for complex machining, many procedures, and high requirements, which require the use of various types of ordinary machine tools and many tools, fixtures, and multiple machining and adjustment to complete the parts. The main objects of processing are box parts, complex curved surfaces, shaped parts, disks, sleeves, plate parts and special beads processing. 2. CNC machining center can process box parts Box parts generally refer to parts with more than one hole system, a cavity inside, and a certain proportion in the length, width, and height directions. Such parts are more commonly used in machine tools, automobiles, and aircraft manufacturing. Such parts generally require multi-position hole system and plane processing, with high tolerance requirements, especially strict shape and position tolerance requirements, usually through milling, drilling, expanding, boring, reaming, countersinking, tapping and other processes. There are many tools, it is difficult to process on ordinary machine tools, the number of tooling sets is high, the cost is high, the processing cycle is long, multiple clampings are required, the calibration is correct, and the number of manual measurements is large. The tools must be frequently changed during processing. The important thing is that accuracy is difficult to guarantee. For machining centers that process box-type parts, when there are many machining stations, parts that require multiple rotations of the table can be completed. Generally, horizontal boring and milling machining centers are selected. When there are fewer machining stations and the span is not large. When it is large, you can choose a vertical machining center to process from one end. Complex surface The CNC machining center occupies a particularly important place in the machining industry, especially in the aerospace industry. It is difficult or impossible to complete the complex surface using ordinary machining methods. In China, the traditional method is to use precision casting, and it is conceivable that its accuracy is very low. 3.CNC machining center can process complex curved surface parts Such as: various impellers, wind guide wheels, spherical surfaces, various curved forming dies, propellers and propellers of underwater vehicles, and some other free-form surfaces. These parts can be processed by machining centers. The more typical ones are: a.CNC machining center cam Cams, as the basic components of mechanical information storage and transmission, are widely used in various automatic machines. Such parts have various curved disk cams, cylindrical cams, conical cams, barrel cams, and end cams. Machining this kind of parts can choose three-axis, four-axis linkage or five-axis linkage machining center according to the complicated program of cam. b. Integral impeller of CNC machining center Such parts a...
What is CNC machining?

What is CNC machining?

CNC machining Generally CNC machining refers to computer-controlled precision machining, CNC machining lathes, CNC machining milling machines, CNC machining boring and milling machines, etc. Introduction CNC is also called computer gong, CNCCH or CNC machine tool. It is actually a name from Hong Kong. Later it was introduced to the Pearl River Delta in mainland China. It is actually a CNC milling machine. This is a new type of processing technology. The main job is to compile processing programs, that is, to turn the original manual work into computer programming. Of course, you need to have experience in manual processing. Determination of CNC machining routes NC lathe feed processing route refers to the path that the turning tool moves from the tool setting point (or fixed origin of the machine tool) until it returns to that point and ends the machining program, including the path of cutting processing and non-cutting such as cutting in and out Empty travel path. The feed route for finishing is basically performed along the contour of its parts. Therefore, the focus of determining the feed route is to determine the feed route for rough machining and empty stroke. In CNC lathe processing, the determination of processing routes generally follows the following principles. ① The precision and surface roughness of the workpiece to be processed should be guaranteed. ② Make the processing route the shortest, reduce the idle travel time, and improve the processing efficiency. ③ Simplify the workload of numerical calculation and simplify the processing procedures. ④ For some reusable programs, subroutines should be used. CNC pros and cons CNC machining has the following advantages: ① Reduce the number of tooling a lot, and do not need complicated tooling to process parts with complex shapes. If you want to change the shape and size of the part, you only need to modify the part processing program, which is suitable for new product development and modification. ② Stable processing quality, high processing accuracy and high repeat accuracy, adapt to the processing requirements of the aircraft. ③ The production efficiency is higher in the case of multi-variety and small batch production, which can reduce the time for production preparation, machine tool adjustment and process inspection, and reduce the cutting time due to the use of the optimal cutting amount. ④ It can process complex profiles that are difficult to process by conventional methods, and even machining parts that cannot be observed. The disadvantage of NC machining is that the cost of machine tools and equipment is high, requiring a high level of maintenance personnel. CNC machining NC machining refers to machining performed by CNC machining tools. CNC index controlled machine tools are programmed and controlled by CNC machining language, usually G code. The NC machining G code language tells the NC machine tool which Cartesian position coordinates are used, and controls the tool feed speed an...
Metal Connectors

Metal Connectors

CONNECTORS A connector is a coupling device that joins electrical terminations to create an electrical circuit. Connectors enable contact between wires, cables, printed circuit boards, and electronic components.  we attend customer design and manufacture an expansive portfolio of connectors that are engineered to reliably transmit data, power, and signal in the harshest environments, under the most extreme use. Our connectors are manufactured to reduce application size and power usage while enabling increased performance. Our audio and visual connectors offer enhanced board retention and EMI shielding. Our automotive connectors are build to withstand harsh conditions of highway and off-road transportation. Our card edge connectors and sockets support the current SDRAM and DDR memory generations and the new DDR2, DDR3, and DDR4 as well as FBDIMM generations.
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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 lowe...
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
CNC machining process of shaft parts

CNC machining process of shaft parts

CNC machining process of shaft parts Shaft parts are one of the products we received the most orders. According to the structure of the shaft, it can be divided into three types: optical axis, step axis and special axis. Their role is to support gears, belt wheels and other transmission parts to transmit torque or motion. The processing technology of stepped shaft is more typical, which reflects most of the content and basic rules of shaft parts processing. The following uses the transmission shaft in the reduction gearbox as an example to introduce the processing technology of a general step shaft, that is CNC machining parts. 1.Part drawing analysis The parts shown in Figure A-1 are the drive shafts in the reducer. It belongs to the step shaft type parts, which is composed of cylindrical surface, shaft shoulder, thread, screw tail retraction groove, grinding wheel overtravel groove and key groove. The shaft shoulder is generally used to install the axial position of the part on the shaft. The role of each ring groove is to make the part have a correct position when assembling, and to make it easy to retract the tool when grinding the outer circle or thread. Install keys to transmit torque; threads are used to install various lock nuts and adjustment nuts. According to the working performance and conditions, the transmission shaft pattern (Figure A-1) specifies the main journals M, N, the outer circles P, Q and the shoulders G, H, I have higher dimensions, position accuracy and smaller Surface roughness value and heat treatment requirements. These technical requirements must be ensured during processing. Therefore, the key process of this transmission shaft is the machining of journals M, N and outer circles P, Q. For example brass nozzle. 2.Determine the blank The material of the transmission shaft is 45 steel. Because it belongs to a general transmission shaft, 45 steel can be selected to meet its requirements. In this example, the transmission shaft belongs to medium and small transmission shafts, and the diameter of each outer circle is not much different, so a 60mm hot-rolled round steel is selected as the blank. 3.Determine the machining method of the main surface Drive shafts are mostly rotary surfaces, and are mainly formed by turning and cylindrical grinding. Due to the higher tolerance grade (IT6) of the main surfaces of the drive shaft M, N, P, and Q, and the low surface roughness Ra (Ra = 0.8 um), grinding is required after turning. The machining scheme of the outer surface (refer to Table A-3) can be: Rough turning → semi-finishing turning → grinding. 4.Positioning reference Reasonably selecting the positioning reference has a decisive effect on the size and position accuracy of the part. Since the several main mating surfaces (Q, P, N, M) and shoulder surfaces (H, G) of the transmission shaft have radial circle runout and end face circle runout requirements for the reference axis AB, it is a solid shaft Therefore, the cen...
Dec 23, 2019
  • 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 lowe...
  • 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...
  • 23

    Dec, 2019

    CNC machining process of shaft parts

    CNC machining process of shaft parts Shaft parts are one of the products we received the most orders. According to the structure of the shaft, it can be divided into three types: optical axis, step axis and special axis. Their role is to support gears, belt wheels and other transmission parts to transmit torque or motion. The processing technology of stepped shaft is more typical, which reflects most of the content and basic rules of shaft parts processing. The following uses the transmission shaft in the reduction gearbox as an example to introduce the processing technology of a general step shaft, that is CNC machining parts. 1.Part drawing analysis The parts shown in Figure A-1 are the drive shafts in the reducer. It belongs to the step shaft type parts, which is composed of cylindrical surface, shaft shoulder, thread, screw tail retraction groove, grinding wheel overtravel groove and key groove. The shaft shoulder is generally used to install the axial position of the part on the shaft. The role of each ring groove is to make the part have a correct position when assembling, and to make it easy to retract the tool when grinding the outer circle or thread. Install keys to transmit torque; threads are used to install various lock nuts and adjustment nuts. According to the working performance and conditions, the transmission shaft pattern (Figure A-1) specifies the main journals M, N, the outer circles P, Q and the shoulders G, H, I have higher dimensions, position accuracy and smaller Surface roughness value and heat treatment requirements. These technical requirements must be ensured during processing. Therefore, the key process of this transmission shaft is the machining of journals M, N and outer circles P, Q. For example brass nozzle. 2.Determine the blank The material of the transmission shaft is 45 steel. Because it belongs to a general transmission shaft, 45 steel can be selected to meet its requirements. In this example, the transmission shaft belongs to medium and small transmission shafts, and the diameter of each outer circle is not much different, so a 60mm hot-rolled round steel is selected as the blank. 3.Determine the machining method of the main surface Drive shafts are mostly rotary surfaces, and are mainly formed by turning and cylindrical grinding. Due to the higher tolerance grade (IT6) of the main surfaces of the drive shaft M, N, P, and Q, and the low surface roughness Ra (Ra = 0.8 um), grinding is required after turning. The machining scheme of the outer surface (refer to Table A-3) can be: Rough turning → semi-finishing turning → grinding. 4.Positioning reference Reasonably selecting the positioning reference has a decisive effect on the size and position accuracy of the part. Since the several main mating surfaces (Q, P, N, M) and shoulder surfaces (H, G) of the transmission shaft have radial circle runout and end face circle runout requirements for the reference axis AB, it is a solid shaft Therefore, the cen...
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