A new energy high-precision motor rear end cover precision manufacturing process

Abstract

The application discloses a precision manufacturing process for a new-energy high-precision motor rear end cover and belongs to the technical field of automobile part machining. The precision manufacturing process for the new-energy high-precision motor rear end cover is invented from aspects of machining equipment selection, process scheme design and tool fixture design, and problems such as high-precision dimension chain, high-precision geometric tolerance, high cleanliness and extreme cost reduction of new-energy automobile products are solved, and the precision manufacturing process is suitable for the iteration and development requirements of the automobile industry.

Description

Technical Field

[0001] This invention belongs to the field of automotive parts processing technology, specifically relating to a precision manufacturing process for the rear end cover of a high-precision electric motor for new energy vehicles. Background Technology

[0002] The impact of new energy vehicles on the traditional automobile manufacturing industry is increasing daily. Our company is facing a critical stage of transformation and upgrading. New energy products require high-precision dimensional chains, high geometrical tolerances, high cleanliness, and low cost, posing a severe challenge to us. The high-precision motor rear end cover for new energy vehicles has stringent requirements in terms of dimensional chains, geometrical tolerances, and cleanliness, while also demanding lower costs. This is one of the key difficulties our company must overcome in its transformation and upgrading process. Therefore, we must develop a precision manufacturing process for the high-precision motor rear end cover for new energy vehicles, addressing issues such as high-precision dimensional chains, high geometrical tolerances, high cleanliness, and extreme cost reduction in new energy vehicle products, to adapt to the iterative development needs of the automotive industry. Summary of the Invention

[0003] In order to overcome the shortcomings of the existing technology, the purpose of this invention is to provide a precision manufacturing process for the rear end cover of a high-precision electric motor for new energy.

[0004] The technical solution adopted by this invention to solve its technical problem is: A precision manufacturing process for a high-precision motor rear end cover for new energy vehicles. The processing device used in the precision manufacturing process of the high-precision motor rear end cover for new energy vehicles includes a machining center, a testing machine, and a cleaning machine. The processing fixture used in the precision manufacturing process of the high-precision motor rear end cover for new energy vehicles includes a first processing fixture, a second processing fixture, and a first testing fixture. The rear end cover of the motor is provided with reference surface A, reference surface E, first positioning hole and second positioning hole; The processing method includes the following steps: OP10 machining process: The first positioning hole and the second positioning hole of the motor rear end cover are engaged and fixed with the first machining fixture, and the machining center is used to machine the parts of the motor rear end cover in the A reference plane direction and the parts in the E reference plane direction respectively. OP20 machining process: The first and second positioning holes of the motor rear end cover are engaged and fixed with the second machining fixture, and the part of the motor rear end cover in the E reference plane direction is machined by the machining center; OP30 laser marking process: A QR code containing the part number, production date and serial number, as well as a clear code, is marked on the rear end cover of the motor. OP40 Leakage Testing Procedure: The rear end cover of the motor is fitted and fixed with the leakage testing fixture. Pressurized gas is introduced into the cavity of the rear end cover of the motor through the leakage testing machine, and the leakage amount is detected using a leak meter. OP50 Cleaning Process: The product is cleaned using a cleaning machine; OP60 full inspection process: manual inspection of product appearance defects and conformity marks; OP70 Air Cleaning Process: Use an air gun to clean the product surface, inner holes and cavities by blowing air. OP80 Packaging Process: Packaging is carried out using special packaging materials.

[0005] Preferably, the first processing fixture includes a first fixture transverse base plate, a first fixture steering base plate, and a first steering mechanism. The first steering mechanism is disposed on the first fixture transverse base plate, and the drive end of the first steering mechanism is connected to the first fixture steering base plate. The first fixture steering base plate is provided with a first fixture clearance position, a first transverse fixture cylinder device, and a first transverse fixture positioning member. The first transverse fixture cylinder device and the first transverse fixture positioning member are arranged around the first fixture clearance position. When the motor rear end cover is fixed to the first processing fixture, the part of the motor rear end cover in the E reference plane direction corresponds to the position of the first fixture clearance position. The second machining fixture includes a second fixture transverse base plate, and a second transverse fixture hydraulic cylinder device and a second transverse fixture positioning component are provided on the second fixture transverse base plate. When the motor rear end cover is fixed to the second machining fixture, the part of the motor rear end cover in the E reference plane direction is set towards the machining end direction of the machining center.

[0006] Preferably, the first steering mechanism includes a steering base, a steering shaft, and a limiting rod. There are two steering bases connected to the transverse base plate of the first clamp. The steering shaft is rotatably engaged with the steering base and is the driving end of the first steering mechanism. The first clamp steering base plate is located between the two steering bases. The limiting rod is located on the steering base, and one end of the limiting rod can abut against the steering shaft.

[0007] Preferably, the first test clamp includes a first test horizontal base plate and a first test vertical support. The first test horizontal base plate is provided with a first test bottom sealing device, and the first test vertical support is provided with a first test top sealing device. When the motor rear end cover is fixed to the first test clamp, the first test bottom sealing device cooperates with the cavity of the motor rear end cover, and the first test top sealing device cooperates with the end face of the motor rear end cover.

[0008] Preferably, in the OP10 process, the first steering mechanism rotates the first fixture steering base plate and sets the part of the motor rear end cover in the direction of the A reference surface toward the machining end of the machining center, and uses a carbide end mill to mill the gate of the motor rear end cover in the direction of the A reference surface. The first steering mechanism rotates the first fixture steering base plate and sets the part of the motor rear end cover in the direction of the E reference surface toward the machining end of the machining center. The PCD milling cutter is used to mill the E surface, φ52 hole end face, φ62 hole end face and two first small end faces of the motor rear end cover. The inner side of the φ52 hole end face at the rear end cover of the motor was milled and the root was cleaned using a PCD milling cutter. The φ6 hole at the rear end cover of the motor was precision drilled using a carbide drill bit and a PCD reamer. The φ52xφ49 hole at the rear end cover of the motor was rough bored using a PCD rough boring tool. The first steering mechanism rotates the first fixture steering base plate and sets the part of the motor rear end cover in the direction of the reference surface A toward the machining end of the machining center. The A surface and the φ62 hole end face of the motor rear end cover are milled using a PCD milling cutter. The φ62 hole at the rear end cover of the motor was rough-bored and fine-bored using a PCD rough boring tool and a PCD fine boring tool. The φ49 hole, φ52 hole, and φ57.7xφ62 hole at the rear end cover of the motor were precision bored using a PCD precision boring tool. The φ8 hole at the rear end cover of the motor was drilled and reamed using a PCD drill and reamer. The rear end cover of the motor was threaded using a carbide drill bit; The first steering mechanism rotates the first fixture steering base plate and sets the side portion of the motor rear end cover toward the machining end of the machining center, using a PCD drill bit to form a φ21.7 hole and using an OSG tap to machine a threaded hole.

[0009] Preferably, in the OP20 process, a carbide end mill is used to mill the end face of the φ21.7 hole on the side of the motor rear end cover; The five second small end faces and two process tables of the motor rear end cover in the E reference plane direction were milled using a carbide end mill. The second small end face of the motor rear end cover and the process table are milled and the root is cleaned using a disc milling cutter. The rear end cover of the motor was drilled using a PCD drill bit and a PCD drill reamer. The motor rear end cover was threaded using a carbide drill bit and an OSG tap.

[0010] Preferably, in the OP30 process, a QR code containing the part number, production date, and serial number is engraved on the blank surface of the motor rear end cover in the E reference plane direction. The engraving control requirements are as follows: QR code size: 8mm × 8mm; before engraving the QR code, a white background is engraved in the corresponding position, with a size of 10mm × 10mm; when scanning the QR code, the displayed content is consistent with the serial number and there are no missing numbers; the engraving design rule is: part number + processing batch year / month / day + production shift + production date + serial number.

[0011] Preferably, in the OP40 process, the leakage requirements for the cavity of the motor rear end cover are as follows: 60 kPa pressure gas is introduced into the cavity, the test time is 10 seconds, and the leakage is less than 5 CC / min. A dry-type leak tester is selected, coupled with a high-precision COSMO leak meter for leak testing. The leak testing process parameters are: pre-inflation time: 2 seconds, inflation time: 30 seconds, balancing time: 1 second, stabilization time: 15 seconds, detection time: 10 seconds, venting time: 1 second; leak testing frequency: 100% inspection; before operation, ensure that the workbench surface, fixture positioning surface, and sealing surface are free of slag and debris; before operation, OK and NG samples are verified; during operation, OK samples are automatically tested, and NG samples trigger audible and visual alarms.

[0012] Preferably, in the OP50 process, the cleanliness requirements are: 2.5 mg / 1000 cm², maximum metal particle size not exceeding 600 μm, and non-metal particle size <800 x 1000 μm. Due to the stringent cleanliness requirements, the cleaning machine is a multi-tank high-pressure cleaner. The cleaning process is as follows: the first tank is a high-pressure water cleaning tank using tap water for rough washing → the second tank is a high-pressure water spray cleaning tank using cleaning agents for fine washing → the third tank is an air blowing tank to remove most of the moisture from the workpiece surface → the fourth tank is a drying tank to completely dry the workpiece.

[0013] Preferably, in the OP70 process, aluminum shavings, fibers, hair, and plastic particles are removed from the product surface a second time to ensure the product meets high cleanliness requirements.

[0014] Compared with the prior art, the beneficial effects of the present invention include: This invention optimizes processing parameters and tooling design, effectively solving processing technical problems such as high-precision hole diameter, high-precision geometric tolerance, and high-precision dimensional chain tolerance. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic flowchart of the processing method of the present invention; Figure 2 This is a schematic diagram of the motor rear end cover in the direction of reference plane A of the present invention; Figure 3 This is a schematic diagram of the E-reference plane direction of the motor rear end cover of the present invention; Figure 4 This is a schematic diagram of the motor rear end cover of the present invention from a side view. Figure 5 This is a front view schematic diagram of the first machining fixture of the present invention; Figure 6 This is a top view schematic diagram of the first machining fixture of the present invention; Figure 7 This is a schematic diagram of the structure of the first processing fixture of the present invention being fixed to the rear end cover of the motor; Figure 8 This is a top view schematic diagram of the second machining fixture of the present invention; Figure 9 This is a schematic diagram of the structure of the second processing fixture of the present invention being fixed to the rear end cover of the motor; Figure 10 This is a schematic diagram of the structure of the first test clamp of the present invention being fixed to the rear end cover of the motor.

[0017] 1-Motor rear end cover, 101-First positioning hole, 102-Second positioning hole; 2-First machining fixture, 201-First fixture transverse base plate, 202-First fixture steering base plate, 203-First fixture clearance position, 204-First transverse fixture hydraulic cylinder device, 205-First transverse fixture positioning component, 206-Steering base, 207-Steering shaft, 208-Limit rod; 3-Second machining fixture, 301-Second fixture transverse base plate, 302-Second transverse fixture hydraulic cylinder device, 303-Second transverse fixture positioning component; 4-First test clamp, 401-First test horizontal base plate, 402-First test vertical support, 403-First test bottom sealing device, 404-First test top sealing device. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. Many specific details are set forth in the following description to provide a thorough understanding of the present invention; the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0020] Example: like Figure 1-10 As shown, this embodiment provides a precision manufacturing process for a high-precision motor rear end cover for new energy vehicles. The processing device for the precision manufacturing process of the high-precision motor rear end cover for new energy vehicles includes a machining center, a testing machine, and a cleaning machine. The processing fixture for the precision manufacturing process of the high-precision motor rear end cover for new energy vehicles includes a first processing fixture 2, a second processing fixture 3, and a first testing fixture 4. The first machining fixture 2 includes a first fixture transverse base plate 201, a first fixture steering base plate 202, and a first steering mechanism. The first steering mechanism is located on the first fixture transverse base plate 201, and the drive end of the first steering mechanism is connected to the first fixture steering base plate 202. The first fixture steering base plate 202 is provided with a first fixture clearance position 203, a first transverse fixture cylinder device 204, and a first transverse fixture positioning component 205. The first transverse fixture cylinder device 204 and the first transverse fixture positioning component 205 are arranged around the first fixture clearance position 203. When the motor rear end cover 1 is fixed to the first machining fixture 2, the part of the motor rear end cover 1 in the E reference plane direction corresponds to the position of the first fixture clearance position 203. The second machining fixture 3 includes a second fixture transverse base plate 301. A second transverse fixture cylinder device 302 and a second transverse fixture positioning component 303 are provided on the second fixture transverse base plate 301. When the motor rear end cover 1 is fixed to the second machining fixture 3, the part of the motor rear end cover 1 in the E reference plane direction is set towards the machining end direction of the machining center. The first steering mechanism includes a steering base 206, a steering shaft 207 and a limiting rod 208. There are two steering bases 206 and they are connected to the first fixture transverse base plate 201. The steering shaft 207 is rotatably engaged with the steering base 206. The steering shaft 207 is the driving end of the first steering mechanism. The first fixture steering base plate 202 is located between the two steering bases 206. The limiting rod 208 is located on the steering base 206. One end of the limiting rod 208 can abut against the steering shaft 207.

[0021] Specifically, the first test clamp 4 includes a first test horizontal base plate 401 and a first test vertical support 402. The first test horizontal base plate 401 is provided with a first test bottom sealing device 403, and the first test vertical support 402 is provided with a first test top sealing device 404. When the motor rear end cover 1 is fixed with the first test clamp 4, the first test bottom sealing device 403 cooperates with the cavity of the motor rear end cover 1, and the first test top sealing device 404 cooperates with the end face of the motor rear end cover 1.

[0022] The rear end cover 1 of the motor is provided with reference surface A, reference surface E, first positioning hole 101 and second positioning hole 102; The processing method includes the following steps: OP10 machining process: The first positioning hole 101 and the second positioning hole 102 of the motor rear end cover 1 are fitted and fixed with the first machining fixture 2, and the parts in the A reference plane direction and the E reference plane direction of the motor rear end cover 1 are machined by the machining center respectively. Specifically, in the OP10 process, the first steering mechanism rotates the first fixture steering base plate 202 and sets the part of the motor rear end cover 1 in the direction of the A reference surface toward the machining end of the machining center. The gate of the A reference surface of the motor rear end cover 1 is milled using a carbide end mill. This step removes the die-cast gate and most of the machining allowance to prevent poor machining roughness and flatness when finishing milling the A reference surface. The first steering mechanism rotates the first fixture steering base plate 202, and sets the part of the motor rear end cover 1 in the direction of the E reference plane toward the machining end of the machining center. The PCD milling cutter is used to mill the E surface, the end face of the φ52 hole, the end face of the φ62 hole, and the two first small end faces at the motor rear end cover 1. The φ52 hole and φ62 hole in this step have a perpendicularity requirement of φ0.01 relative to the A reference plane, which must be ensured by reverse boring in the direction of the A reference plane. The inner side of the φ52 hole end face at the rear end cover 1 of the motor is milled and the root is cleared using a PCD milling cutter. Specifically, the PCD milling cutter is a PCD small milling cutter because there are small rounded corners on the side wall of the φ52 hole end face, which cannot be machined by a large diameter milling cutter. Therefore, a PCD small milling cutter must be used to clear the residual material by following the trajectory. The φ6 hole at the rear end cover of the motor was precision drilled using a carbide drill bit and a PCD reamer. The φ52xφ49 hole at the rear end cover of the motor was rough bored using a PCD rough boring tool. The first steering mechanism rotates the first fixture steering base plate 202 and sets the part of the motor rear end cover 1 in the direction of the reference surface A toward the machining end of the machining center. The PCD milling cutter is used to mill the A surface and the φ62 hole end face of the motor rear end cover 1. The φ62 hole at the rear end cover of the motor was rough-bored and fine-bored using a PCD rough boring tool and a PCD fine boring tool. The φ49 hole, φ52 hole, and φ57.7xφ62 hole at the rear end cover of the motor were precision bored using a PCD precision boring tool. The φ8 hole at the rear end cover of the motor was drilled and reamed using a PCD drill and reamer. The above machining sequence was carried out in the same process and in the same direction to ensure that the machining dimensional chain and related geometric tolerances met the accuracy requirements. Use a carbide drill bit to machine the threaded hole in the rear cover 1 of the motor; The first steering mechanism rotates the first fixture steering base plate 202 and sets the side part of the motor rear end cover 1 toward the machining end of the machining center, using a PCD drill bit to form a φ21.7 hole and using an OSG tap to machine a threaded hole.

[0023] The A-side, φ62 hole end face, and φ8 hole after the above processing can be used as the precision positioning reference for the following OP20 machining process to ensure the dimensional stability of the OP20 process.

[0024] OP20 machining process: The first positioning hole 101 and the second positioning hole 102 of the motor rear end cover 1 are engaged and fixed with the second machining fixture 3, and the part of the motor rear end cover 1 in the E reference plane direction is machined by the machining center. In the OP20 process, a carbide end mill is used to mill the end face of the φ21.7 hole on the side of the motor rear cover 1. The machining of the end face of the φ21.7 hole is considered in the OP20 process to balance the cycle time. The five second small end faces of the motor rear end cover 1 in the direction of the E reference plane and the two process tables were milled using carbide end mills. The second small end face of the motor rear end cover 1 and the process table are milled and the root is cleaned using a disc milling cutter. The rear end cover 1 of the motor was drilled using a PCD drill bit and a PCD drill reamer. Use a carbide drill bit and an OSG tap to machine the threaded hole in the rear cover 1 of the motor. After processing, edge cleaning and deburring are performed to remove aluminum shavings, burrs, cutting fluid, etc. from the product, laying the foundation for subsequent production processes.

[0025] OP30 Laser Engraving Process: A QR code containing the part number, production date, and serial number, along with a clear code, is engraved on the rear end cover 1 of the motor. Specifically, the QR code containing the part number, production date, and serial number is engraved on the rough surface of the rear end cover 1 in the E reference plane direction. Engraving control requirements: QR code size: 8mm × 8mm; Before engraving the QR code, a white background of 10mm × 10mm is engraved in the corresponding position; Scanning the QR code: The displayed content is consistent with the serial number, with no missing numbers; The engraving design rule is: Part number + processing batch year / month / day + production shift + production date + serial number; OP40 Leakage Testing Procedure: The rear end cover 1 of the motor is fitted and fixed to the leakage testing fixture. Pressurized gas is introduced into the cavity of the rear end cover 1 using the leakage testing machine. A leak meter is used to detect the leakage. Specifically, the leakage requirements for the cavity of the rear end cover 1 are: 60 kPa pressurized gas is introduced into the cavity, the test time is 10 seconds, and the leakage is less than 5 CC / min. A dry leakage testing machine is selected, coupled with a high-precision COSMO leak meter for the leakage test. The leakage testing process parameters are: pre-inflation time: 2 seconds, inflation time: 30 seconds, balancing time: 1 second, stabilization time: 15 seconds, detection time: 10 seconds, exhaust time: 1 second; testing frequency: 100% inspection; before operation, ensure that the worktable surface, fixture positioning surface, and sealing surface are free of slag and debris; before operation, OK and NG samples are verified; during operation, OK samples are automatically checked, and NG samples trigger audible and visual alarms; OP50 Cleaning Process: The product is cleaned using a cleaning machine. Specifically, the cleanliness requirements are: 2.5mg / 1000cm², maximum metal particle size not exceeding 600um, and non-metal particle size <800x1000um. Due to the strict cleanliness requirements, a multi-tank high-pressure cleaner is used. The cleaning process is as follows: The first tank is a high-pressure water cleaning tank using tap water for rough cleaning → the second tank is a high-pressure water spray cleaning tank using cleaning agents for fine cleaning → the third tank is an air blowing tank to remove most of the moisture from the workpiece surface → the fourth tank is a drying tank to completely dry the workpiece. OP60 full inspection process: manual inspection of product appearance defects and conformity marks; OP70 air cleaning process: Use an air gun to clean the product surface, inner holes and cavities by blowing air. Specifically, this process removes aluminum shavings, fibers, hair, plastic particles and other foreign matter from the product surface to ensure a high level of cleanliness. OP80 Packaging Process: Packaging is carried out using special packaging materials.

[0026] 1. The precision manufacturing process for the rear end cover of the new energy high-precision motor proposed in this invention combines the machining requirements of the machining center to design machining fixtures, thereby meeting the machining requirements of different machining surfaces of the motor rear end cover.

[0027] 2. The optimization of machining parameters and the design of the entire tooling effectively solved the machining technical problems such as high-precision hole diameter, high-precision geometric tolerance, and high-precision dimensional chain.

[0028] 3. By using high-pressure cleaning equipment in conjunction with air blowing cleaning process, we ensure that the products meet the requirements for ultra-high cleanliness.

[0029] 4. By optimizing the process flow, this invention significantly improves the quality stability and processing efficiency of mass production, meeting the needs of industrialized mass production and extreme cost reduction.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A precision manufacturing process for the rear end cover of a high-precision electric motor for new energy applications, characterized in that, The processing device for the precision manufacturing process of the rear end cover of the new energy high-precision motor includes a machining center, a testing machine and a cleaning machine. The processing fixture for the precision manufacturing process of the rear end cover of the new energy high-precision motor includes a first processing fixture, a second processing fixture and a first testing fixture. The rear end cover of the motor is provided with reference surface A, reference surface E, first positioning hole and second positioning hole; The processing method includes the following steps: OP10 machining process: The first positioning hole and the second positioning hole of the motor rear end cover are engaged and fixed with the first machining fixture, and the machining center is used to machine the parts of the motor rear end cover in the A reference plane direction and the parts in the E reference plane direction respectively. OP20 machining process: The first and second positioning holes of the motor rear end cover are engaged and fixed with the second machining fixture, and the part of the motor rear end cover in the E reference plane direction is machined by the machining center; OP30 laser marking process: A QR code containing the part number, production date and serial number, as well as a clear code, is marked on the rear end cover of the motor. OP40 Leakage Testing Procedure: The rear end cover of the motor is fitted and fixed with the leakage testing fixture. Pressurized gas is introduced into the cavity of the rear end cover of the motor through the leakage testing machine, and the leakage amount is detected using a leak meter. OP50 Cleaning Process: The product is cleaned using a cleaning machine; OP60 full inspection process: manual inspection of product appearance defects and conformity marks; OP70 Air Cleaning Process: Use an air gun to clean the product surface, inner holes and cavities by blowing air. OP80 Packaging Process: Packaging is carried out using special packaging materials.

2. The precision manufacturing process of the rear end cover of the high-precision motor for new energy vehicles according to claim 1, characterized in that, The first machining fixture includes a first fixture transverse base plate, a first fixture steering base plate, and a first steering mechanism. The first steering mechanism is disposed on the first fixture transverse base plate, and the drive end of the first steering mechanism is connected to the first fixture steering base plate. The first fixture steering base plate is provided with a first fixture clearance position, a first transverse fixture cylinder device, and a first transverse fixture positioning member. The first transverse fixture cylinder device and the first transverse fixture positioning member are arranged around the first fixture clearance position. When the motor rear end cover is fixed to the first machining fixture, the part of the motor rear end cover in the E reference plane direction corresponds to the position of the first fixture clearance position. The second machining fixture includes a second fixture transverse base plate, and a second transverse fixture hydraulic cylinder device and a second transverse fixture positioning component are provided on the second fixture transverse base plate. When the motor rear end cover is fixed to the second machining fixture, the part of the motor rear end cover in the E reference plane direction is set towards the machining end direction of the machining center.

3. The precision manufacturing process for the rear end cover of the high-precision motor for new energy vehicles according to claim 2, characterized in that, The first steering mechanism includes a steering base, a steering shaft, and a limiting rod. There are two steering bases, which are connected to the transverse base plate of the first fixture. The steering shaft is rotatably engaged with the steering base and is the driving end of the first steering mechanism. The first fixture steering base plate is located between the two steering bases. The limiting rod is located on the steering base, and one end of the limiting rod can abut against the steering shaft.

4. The precision manufacturing process of the rear end cover of the high-precision motor for new energy vehicles according to claim 1, characterized in that, The first test clamp includes a first test horizontal base plate and a first test vertical support. The first test horizontal base plate is provided with a first test bottom sealing device, and the first test vertical support is provided with a first test top sealing device. When the motor rear end cover is fixed to the first test clamp, the first test bottom sealing device cooperates with the cavity of the motor rear end cover, and the first test top sealing device cooperates with the end face of the motor rear end cover.

5. The precision manufacturing process for the rear end cover of the high-precision motor for new energy vehicles according to claim 1, characterized in that, In the OP10 process, the first steering mechanism rotates the first fixture steering base plate and sets the part of the motor rear end cover in the direction of the A reference surface toward the machining end of the machining center. A carbide end mill is used to mill the gate of the motor rear end cover in the direction of the A reference surface. The first steering mechanism rotates the first fixture steering base plate and sets the part of the motor rear end cover in the direction of the E reference surface toward the machining end of the machining center. The PCD milling cutter is used to mill the E surface, φ52 hole end face, φ62 hole end face and two first small end faces of the motor rear end cover. The inner side of the φ52 hole end face at the rear end cover of the motor was milled and the root was cleaned using a PCD milling cutter. The φ6 hole at the rear end cover of the motor was precision drilled using a carbide drill bit and a PCD reamer. The φ52xφ49 hole at the rear end cover of the motor was rough bored using a PCD rough boring tool. The first steering mechanism rotates the first fixture steering base plate and sets the part of the motor rear end cover in the direction of the reference surface A toward the machining end of the machining center. The A surface and the φ62 hole end face of the motor rear end cover are milled using a PCD milling cutter. The φ62 hole at the rear end cover of the motor was rough-bored and fine-bored using a PCD rough boring tool and a PCD fine boring tool. The φ49 hole, φ52 hole, and φ57.7xφ62 hole at the rear end cover of the motor were precision bored using a PCD precision boring tool. The φ8 hole at the rear end cover of the motor was drilled and reamed using a PCD drill and reamer. The rear end cover of the motor was threaded using a carbide drill bit; The first steering mechanism rotates the first fixture steering base plate and sets the side portion of the motor rear end cover toward the machining end of the machining center, using a PCD drill bit to form a φ21.7 hole and using an OSG tap to machine a threaded hole.

6. The precision manufacturing process for the rear end cover of the high-precision motor for new energy vehicles according to claim 1, characterized in that, In the OP20 process, a carbide end mill is used to mill the end face of the φ21.7 hole on the side of the motor rear end cover; The five second small end faces and two process tables of the motor rear end cover in the E reference plane direction were milled using a carbide end mill. The second small end face of the motor rear end cover and the process table are milled and the root is cleaned using a disc milling cutter. The rear end cover of the motor was drilled using a PCD drill bit and a PCD drill reamer. The motor rear end cover was threaded using a carbide drill bit and an OSG tap.

7. The precision manufacturing process for the rear end cover of the high-precision motor for new energy vehicles according to claim 1, characterized in that, In the OP30 process, a QR code containing the part number, production date, and serial number is engraved on the blank surface of the motor rear end cover in the E reference plane direction. The engraving control requirements are as follows: QR code size: 8mm×8mm; before engraving the QR code, a white background of 10mm×10mm is engraved in the corresponding position; when scanning the QR code, the displayed content is consistent with the serial number and there are no missing numbers; the engraving design rule is: part number + processing batch year / month / day + production shift + production date + serial number.

8. The precision manufacturing process of the rear end cover of the high-precision motor for new energy vehicles according to claim 1, characterized in that, In the OP40 process, the leakage requirements for the cavity of the motor rear end cover are as follows: 60 kPa pressure gas is introduced into the cavity, the test time is 10 seconds, and the leakage rate is less than 5 CC / min. A dry-type leak tester is selected, coupled with a high-precision COSMO leak meter for the leak test. The leak test process parameters are: pre-inflation time: 2 seconds, inflation time: 30 seconds, balancing time: 1 second, stabilization time: 15 seconds, detection time: 10 seconds, venting time: 1 second; leak test frequency: 100% inspection; before operation, ensure that the workbench surface, fixture positioning surface, and sealing surface are free of slag and debris; before operation, verify with OK and NG samples. During operation, OK parts are automatically marked, while NG parts trigger an audible and visual alarm.

9. The precision manufacturing process of the rear end cover of the high-precision motor for new energy vehicles according to claim 1, characterized in that, In the OP50 process, the cleanliness requirements are: 2.5mg / 1000cm2, maximum metal particle size not exceeding 600um, and non-metal particle size <800x1000um. Strict cleanliness requirements are required. The cleaning machine is a multi-tank high-pressure cleaner. The cleaning process is as follows: the first tank is a high-pressure water cleaning tank that uses tap water for rough cleaning → the second tank is a high-pressure water spray cleaning tank that uses cleaning agent for fine cleaning → the third tank is an air blowing tank that removes most of the moisture from the surface of the workpiece → the fourth tank is a drying tank that dries the workpiece as a whole.

10. The precision manufacturing process for the rear end cover of the high-precision motor for new energy vehicles according to claim 1, characterized in that, In the OP70 process, aluminum shavings, fibers, hair, and plastic particles are removed from the product surface a second time to ensure the product meets high cleanliness requirements.

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