Three-in-one motor and processing method of motor shell of three-in-one motor

Abstract

The invention relates to a three-in-one motor and a processing method of a motor shell thereof. The invention discloses a machining method of a three-in-one motor shell. The machining method comprises the following steps that S1, an aluminum block blank is selected for blanking; s2, the aluminum block blank is subjected to shape milling, and therefore a first motor shell semi-finished product with the initial shape is formed; s3, rough machining is conducted on the first motor shell semi-finished product, so that a second motor shell semi-finished product with a motor cavity, a speed reduction cavity and an electric control cavity is formed; s4, the motor cavity assembly end face, the speed reduction cavity assembly end face and the electric control cavity assembly end face of the second motor shell semi-finished product are subjected to rough machining, so that a third motor shell semi-finished product is obtained; s5, stress release is conducted on the third motor shell semi-finished product in a natural aging mode; and S6, after stress release is completed, the motor cavity assembly end face, the speed reduction cavity assembly end face and the electric control cavity assembly end face of the third motor shell semi-finished product are subjected to finish machining, and therefore a motor shell finished product is obtained. And the processing quality of the three-in-one motor can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motor manufacturing, and in particular to a three-in-one motor and a processing method for its motor housing. Background Art

[0002] The structure of a three-in-one motor includes a housing, a motor body, a controller, a reducer, and auxiliary accessories. It can integrate the three core components of a traditional decentralized motor, an electric control system, and a reducer into a single module, not only optimizing the power transmission path, greatly improving the overall efficiency and space utilization rate of the system, providing a more compact, efficient, and lightweight motor solution for new energy vehicles, and becoming a key development direction for the powertrain of new energy vehicles and the drive system of high-end equipment.

[0003] In the prior art, the three-in-one motor housing is usually made of an aluminum alloy blank obtained by a casting process, and then prepared through rough machining, heat treatment, and finish machining. However, during the process of casting the aluminum alloy blank in the early stage, shrinkage porosity defects are likely to occur inside the aluminum alloy blank, resulting in blistering and deformation of the casting. During the subsequent heat treatment process, the air holes inside the aluminum alloy blank will cause surface deterioration and out-of-control dimensional accuracy of the aluminum alloy blank, and will also lead to a decrease in the mechanical properties of the manufactured motor housing. Therefore, there is an urgent need for a processing technology suitable for the three-in-one motor housing to improve the manufacturing quality of the three-in-one motor housing. Summary of the Invention

[0004] The applicant of the present invention aims at the above-mentioned disadvantages in the existing production technology and provides a three-in-one motor and a processing method for its motor housing. By setting six steps, it can avoid the problems of surface deterioration and out-of-control dimensional accuracy of the aluminum block blank during the processing, effectively improve the mechanical properties of the prepared motor housing, and thus improve the processing quality of the three-in-one motor.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A processing method for a three-in-one motor housing includes the following steps:

[0007] S1. Select an aluminum block blank for blanking;

[0008] S2. Perform contour milling on the aluminum block blank to form a first motor housing semi-finished product with a preliminary contour;

[0009] S3. Perform rough machining on the first motor housing semi-finished product to form a second motor housing semi-finished product with a motor cavity, a reduction cavity, and an electric control cavity;

[0010] S4. Perform rough machining on the motor cavity assembly end face, the reduction cavity assembly end face, and the electric control cavity assembly end face of the second motor housing semi-finished product respectively to obtain a third motor housing semi-finished product;

[0011] S5. Stress relief is carried out on the semi-finished product of the third motor housing by natural aging;

[0012] S6. After the stress relief is completed, finish machining is respectively carried out on the motor cavity assembly end face, reduction cavity assembly end face, and electronic control cavity assembly end face of the semi-finished product of the third motor housing, so as to obtain the finished motor housing.

[0013] As a further improvement of the above technical solution:

[0014] In S1., the aluminum block blank is in a cubic shape.

[0015] In S1., the aluminum block blank is forged from aluminum-magnesium alloy AZ91D material.

[0016] In S2., S3., and S4., a three-axis vertical CNC machining equipment is used for machining.

[0017] In S5., under natural aging, the standing time of the semi-finished product of the third motor housing is at least 24h.

[0018] In S6., a five-axis horizontal CNC machining equipment is used for finish machining.

[0019] A three-in-one motor includes a motor housing prepared by the above processing method.

[0020] The beneficial effects of the present invention are as follows:

[0021] The structure of the present invention is compact, reasonable, and convenient to operate. By setting six steps, it can avoid the problems of surface deterioration and out-of-control dimensional accuracy of the aluminum block blank during the processing, and can effectively improve the mechanical properties of the prepared motor housing, thereby improving the processing quality of the three-in-one motor; by directly machining the aluminum block blank into the semi-finished product of the first motor housing with a preliminary shape through contour milling, compared with the conventional casting process, it can avoid the generation of bubbles and deformation inside the aluminum block blank, thereby avoiding the problems of surface deterioration and out-of-control dimensional accuracy in the subsequent process, and improving the mechanical properties of the finished motor housing; by setting a stress relief step, the residual stress inside the material can be released, avoiding cracking or deformation caused by stress concentration after processing, and further improving the processing quality. Description of the Drawings

[0022] Figure 1 is a schematic structural view of the motor housing in the present invention Figure 1 .

[0023] Figure 2 is Figure 1 the rear view of.

[0024] Figure 3 is Figure 1Top view.

[0025] Figure 4 is Figure 1 bottom view.

[0026] Figure 5 is the structural schematic diagram of the motor housing in the present invention Figure 2 .

[0027] Wherein: 1. Motor housing body; 2. Motor cavity; 3. Reduction cavity; 4. Electric control cavity. Specific embodiments

[0028] The following combines the accompanying drawings to illustrate the specific embodiments of the present invention.

[0029] As Figures 1 - 5 shown, the processing method of the three-in-one motor housing in this embodiment includes the following steps:

[0030] S1. Select an aluminum block blank for blanking;

[0031] The aluminum block blank is forged from the aluminum magnesium alloy AZ91D material. It is light in weight itself, which can ensure that the finished motor housing has the advantage of being light in weight. And during the subsequent external milling, rough machining, and finish machining processes, cutting fluid needs to be used to improve processing efficiency, extend tool life, improve surface quality, and maintain the geometric accuracy of the workpiece;

[0032] The aluminum block blank is in a cube shape. According to the design requirements, select an aluminum block blank with appropriate dimensions for blanking to ensure maximum utilization rate while meeting the subsequent processing requirements, reduce waste, and thus control production costs.

[0033] S2. Perform external milling on the aluminum block blank to form a first motor housing semi-finished product with a preliminary shape;

[0034] Specifically, before blanking, first perform data analysis on the motor housing drawing according to the design requirements, determine the processing difficulties and key dimensions, modify and compile the machine tool control program, and then use a three-axis vertical CNC machining equipment for processing, so as to mill the cube-shaped aluminum block blank into a first motor housing semi-finished product corresponding to the shape of the motor housing.

[0035] S3. Perform rough machining on the first motor housing semi-finished product to form a second motor housing semi-finished product with a motor cavity, a reduction cavity, and an electric control cavity;

[0036] Specifically, use a three-axis vertical CNC machining equipment for processing, so as to open a motor cavity, a reduction cavity, and an electric control cavity on the first motor housing semi-finished product. Through rough machining, most of the surplus can be quickly removed, reducing the workload of subsequent finish machining and improving processing efficiency.

[0037] S4. Rough machine the motor cavity assembly end face, reduction cavity assembly end face, and electronic control cavity assembly end face of the second motor housing semi-finished product respectively, so as to obtain the third motor housing semi-finished product;

[0038] Specifically, use a three-axis vertical CNC machining equipment for machining. By rough machining each assembly end face on the second motor housing semi-finished product, the basic shapes and dimensional parameter symbols of each end face can be ensured to meet the requirements, preparing for subsequent finish machining;

[0039] In this embodiment, the motor cavity assembly end face includes the inner circumferential surface of the motor cavity for fitting and installing with the motor body, the first assembly face (the first assembly face is a plane) for fitting and installing with the motor cover, and the inner thread surfaces of several first threaded holes opened on the first assembly face;

[0040] The reduction cavity assembly end face includes the inner circumferential surfaces of several transmission gear mounting holes, the second assembly face for fitting and installing with the lower box cover of the gearbox, and the inner thread surfaces of several second threaded holes opened on the second assembly face;

[0041] The electronic control cavity assembly end face includes the third assembly face for fitting and installing with the rear cover of the electronic control box, and the inner thread surfaces of several third threaded holes opened on the third assembly face;

[0042] S5. Use the natural aging method to release the stress of the third motor housing semi-finished product;

[0043] In this embodiment, under natural aging, the standing time of the third motor housing semi-finished product is at least 24h. By releasing the stress of the third motor housing semi-finished product after rough machining, the residual stress inside the material can be released, thereby reducing deformation during subsequent machining and use, avoiding cracking and deformation caused by stress concentration after machining, and effectively improving the stability and reliability of the product.

[0044] S6. After the stress release is completed, finish machine the motor cavity assembly end face, reduction cavity assembly end face, and electronic control cavity assembly end face of the third motor housing semi-finished product respectively, so as to obtain the finished motor housing;

[0045] Specifically, use a five-axis horizontal CNC machining equipment for finish machining. By finish machining, further improve the dimensional accuracy and surface quality of the finished motor housing to ensure that the finished product meets the design requirements and improve the overall performance and reliability of the product.

[0046] In addition, in this embodiment, multiple fourth assembly faces are also provided on the outer side wall surface of the motor housing for fitting and installing with external accessories such as detection equipment. The fourth assembly faces are arranged for rough machining and finish machining in sequence following the motor cavity assembly end face, reduction cavity assembly end face, and electronic control cavity assembly end face, so that the fourth assembly faces can meet the assembly requirements.

[0047] The three-in-one motor of this embodiment includes a motor housing prepared by the above-mentioned processing method. As Figures 1 - 5 shown, the motor housing includes a motor housing body 1, and a motor cavity 2, a reduction cavity 3, and an electric control cavity 4 are respectively formed on the motor housing body 1; wherein, the motor cavity 2 is used for being cooperatively installed with the motor body, the reduction cavity 3 is used for installing a gear reduction assembly, and the electric control cavity 4 installs a motor control system, so as to integrate the motor, the electric control system, and the reducer into a single module, which has a compact structure, high machining precision and good surface quality of the motor housing, thereby improving the overall performance and reliability of the motor.

[0048] The above description is an explanation of the present invention, not a limitation of the invention. For the scope defined by the present invention, refer to the claims. Any form of modification can be made within the protection scope of the present invention.

Claims

1. A processing method for a three-in-one motor housing, characterized in that: It includes the following steps: S1. Select an aluminum block blank for blanking; S2. Milling the outer shape of the aluminum block blank to form a first semi-finished motor housing with a preliminary outer shape; S3. Rough machining the first semi-finished motor housing to form a second semi-finished motor housing with a motor cavity, a reduction cavity, and an electronic control cavity; S4. Rough machining the motor cavity assembly end face, the reduction cavity assembly end face, and the electronic control cavity assembly end face of the second semi-finished motor housing respectively to obtain a third semi-finished motor housing; S5. Release the stress of the third semi-finished motor housing by natural aging; S6. After the stress release is completed, finish machining the motor cavity assembly end face, the reduction cavity assembly end face, and the electronic control cavity assembly end face of the third semi-finished motor housing respectively to obtain a finished motor housing.

2. The processing method of a three-in-one motor housing according to claim 1, characterized in that: In S1., the aluminum block blank is in a cube shape.

3. The processing method of a three-in-one motor housing as claimed in claim 1, characterized in that: In S1., the aluminum block blank is forged from aluminum magnesium alloy AZ91D material.

4. The processing method of a three-in-one motor housing according to claim 1, characterized in that: In S2., S3., and S4., a three-axis vertical CNC machining equipment is used for machining.

5. The processing method of a three-in-one motor housing according to claim 1, characterized in that: In S5., under natural aging, the standing time of the third semi-finished motor housing is at least 24h.

6. The processing method of a three-in-one motor housing according to claim 1, characterized in that: In S6., a five-axis horizontal CNC machining equipment is used for finish machining.

7. A three-in-one motor, characterized in that: It includes a motor housing prepared by the processing method according to any one of claims 1-6.

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