A method for machining an outer casing of an electric motor

Abstract

This invention proposes a method for machining an outer casing of a motor housing, comprising: fixing the outer casing blank with its A end face facing down on a machining fixture; machining the inner hole of the outer casing using a first boring bar; machining the B-side step using a second boring bar; and machining the A-side step using a back boring bar. This method fixes the outer casing blank on the machining fixture, first machining the inner hole of the outer casing blank, then machining the B-side step, and finally machining the A-side step with a back boring bar. Compared with existing machining methods, this reduces the number of blank flipping steps, ensuring the concentricity of the A-side and B-side steps. By placing the inner hole machining step before the step machining step, this method avoids burrs at the junction of the A-side step and the inner hole, improving machining quality.

Description

Technical Field

[0001] This invention relates to the field of motor manufacturing technology, and in particular to a method for processing an outer casing of a motor. Background Technology

[0002] The motor housing consists of an outer sleeve, an inner sleeve, and an intermediate component located between them. The outer sleeve and inner sleeve are welded together with an aluminum ring, and the internal space forms a fluid channel. The outer sleeve and inner sleeve have steps at the locations where the aluminum ring is installed. These steps support the aluminum ring and facilitate its mating. The motor housing has two end faces, A and B; therefore, the steps also include steps on face A and face B.

[0003] In the existing technology, the processing of the outer casing often involves two separate processes: the A-side step and the B-side step. Specifically, the first process processes the A-side step, and after processing, the outer casing is flipped over. The second process processes the B-side step first, and then processes the inner hole of the outer casing.

[0004] In the process of realizing this invention, the inventors discovered at least the following problems in the prior art: the existing shell outer casing step processing technology involves two clamping operations, which results in positioning errors, causing the concentricity of the A-side step and the B-side step to exceed the tolerance, thus preventing the aluminum ring from being installed properly. In addition, processing the B-side step before processing the inner hole of the outer casing in the second sequence causes burrs to be generated at the junction of the A-side step and the inner hole, which are difficult to remove, affecting production efficiency and yield. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the related art.

[0006] Therefore, the purpose of this invention is to provide a method for processing the outer casing of a motor housing, ensuring the concentricity of the steps on surface A and surface B, and avoiding the formation of burrs at the junction of the steps on surface A and the inner hole of the outer casing.

[0007] To achieve the above objectives, the present invention proposes a method for processing an outer casing of a motor housing, comprising:

[0008] Step S100: Fix the A end face of the outer blank of the motor housing downwards onto the machining fixture;

[0009] Step S200: Use the first boring tool to machine the inner hole of the outer sleeve;

[0010] Step S300: Use the second boring tool to machine the B-side step;

[0011] Step S400: Use a reverse boring tool to machine the step on surface A.

[0012] According to the method for machining the outer casing of the motor housing of the present invention, the outer casing blank is fixed on a machining fixture. First, the inner hole of the outer casing blank is machined, then the B-side step is machined, and finally, the A-side step is machined using a back boring tool. Compared with existing machining methods, this method reduces the number of flipping steps on the outer casing blank, ensuring the concentricity of the A-side and B-side steps. By placing the inner hole machining step before the step machining step, the method avoids burrs at the junction of the A-side step and the inner hole, thus improving machining quality.

[0013] According to one embodiment of the present invention, the machining fixture includes a base plate, a plurality of support blocks, a plurality of cylinders and a plurality of pressure plates. The base plate has a through hole in the middle. The support blocks are arranged around the through hole. The cylinders are mounted on the base plate. The pressure plates are fixedly connected to the push rods of the cylinders. The support blocks are used to place the outer blank. The pressure plates are used to clamp the end face of the outer blank.

[0014] According to one embodiment of the present invention, the pressure plate includes a first pressure plate, a second pressure plate and a third pressure plate, wherein the first pressure plate, the second pressure plate and the third pressure plate are spaced apart and point toward the axis of the outer blank.

[0015] According to one embodiment of the present invention, the machining fixture further includes a support ring, which is coaxially mounted on the base plate with the through hole.

[0016] According to one embodiment of the present invention, the A end face is provided with a pin hole, and the support ring is provided with a positioning pin adapted to the pin hole.

[0017] According to one embodiment of the present invention, the top of the support block has an inclined surface, and the support block is mounted on the support ring.

[0018] According to one embodiment of the present invention, the extension line of the line connecting the highest point and the lowest point of the inclined plane passes through the axis of the outer blank, and the lowest point of the inclined plane is closer to the outer blank than the highest point.

[0019] According to one embodiment of the present invention, the pin hole includes a first pin hole and a second pin hole, and the positioning pin includes a first positioning pin and a second positioning pin. The first pin hole is used to insert the first positioning pin, and the second pin hole is used to insert the second positioning pin.

[0020] According to one embodiment of the present invention, the support block includes a first support block, a second support block, and a third support block of the same shape, wherein the first support block, the second support block, and the third support block are spaced apart.

[0021] According to one embodiment of the present invention, the processing fixture further includes an air pipe having a plurality of branches and nozzles provided on the branches, the nozzles being used to blow air to clean the processing process.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. Wherein:

[0024] Figure 1 This is a schematic diagram of the outer casing of the motor housing.

[0025] Figure 2 This is a schematic diagram of the outer jacket being installed on the processing fixture.

[0026] Figure 3 This is a schematic diagram of the machining tooling.

[0027] Figure 4 This is a schematic flowchart of the motor housing outer sleeve processing method proposed in an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1-First pin hole, 2-A-face step, 3-Second pin hole, 4-Outer sleeve inner hole, 5-A-end face, 6-B-face step, 7-First pressure plate, 8-Second pressure plate, 9-Third pressure plate, 10-B-end face, 11-First positioning pin, 12-First support block, 13-Second support block, 14-Third support block, 15-Second positioning pin, 20-Air pipe, 21-Nozzle, 22-Support ring. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the invention, and should not be construed as limiting the invention. Rather, embodiments of the invention include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0031] Figure 1 This is a structural diagram of the outer casing of the motor housing. (Combined with...) Figure 1 , Figure 2As shown, the finished outer sleeve has two end faces, A end face 5 and B end face 10, and an inner hole 4 in the middle. The inner hole 4 has an A-face step 2 near the A end face 5 and a B-face step 6 near the B end face 10. The A-face step 2 and B-face step 6 support the aluminum ring and ensure proper mating. It is required that the concentricity of these two steps be satisfactory, and that there be no burrs or flanges at the steps; only in this way can the aluminum ring be installed correctly.

[0032] Combination Figures 1 to 4 As shown in the figure, this invention proposes a method for machining an outer casing of a motor. The implementation process of this machining method is as follows:

[0033] Step S100: Fix the A end face 5 of the outer casing blank of the motor housing downwards onto the machining fixture.

[0034] In this embodiment, the outer blank is made of metal material and can be detachably fixed to the machining fixture.

[0035] Step S200: Use the first boring tool to machine the inner hole 4 of the outer sleeve.

[0036] In this embodiment, the first boring tool is clamped on the CNC machining center, the outer blank remains stationary, and the first boring tool is rotated to machine the inner hole 4 of the outer blank.

[0037] Step S300: Use the second boring tool to machine the step 2 on surface A.

[0038] In this embodiment, based on the inner diameter of step 2 on surface A, a suitable second boring tool is selected and clamped on the CNC machining center, while the outer blank remains stationary. The second boring tool is rotated to machine step 2 on surface A.

[0039] Step S400: Use a back boring tool to machine the B-side step 6.

[0040] In this embodiment, a suitable back boring tool is selected and clamped on the CNC machining center according to the inner diameter of the B-side step. The outer blank is kept stationary, and the back boring tool extends below the B-side end face. The back boring tool is rotated to machine the B-side step 6.

[0041] According to an embodiment of the present invention, a method for machining the outer casing of a motor housing involves fixing the outer casing blank on a machining fixture, machining the inner hole of the outer casing blank first, machining the B-side step, and finally machining the A-side step using a back boring tool. Compared with existing machining methods, this method reduces the number of flipping steps on the outer casing blank, ensuring the concentricity of the A-side and B-side steps. By placing the inner hole machining step before the step machining step, the method avoids burrs at the junction of the A-side step and the inner hole, thus improving machining quality.

[0042] In some embodiments, such as Figure 3As shown, the machining fixture includes a base plate, several support blocks, several cylinders, and several pressure plates. The base plate provides support and has a through hole in its center. This through hole allows machining debris to pass through. The support blocks surround the through hole. The cylinders are mounted on the base plate, and the pressure plates are fixedly connected to the cylinder push rods. The support blocks hold the outer blank, separating the base plate from the A-end face of the outer blank, facilitating the machining of the A-side step 2 by the back boring tool. The pressure plates clamp the end face of the outer blank.

[0043] In one example, the pressure plates include a first pressure plate 7, a second pressure plate 8, and a third pressure plate 9, which are mounted above the push rods of different cylinders. The first pressure plate 7, the second pressure plate 8, and the third pressure plate 9 are spaced apart and point towards the axis of the outer blank, which enables the end face of the outer blank to be subjected to uniform force and be firmly fixed.

[0044] The machining fixture also includes a support ring 22, which is coaxially mounted on the base plate with the through hole. To prevent misalignment or displacement between the machining device and the outer blank during machining, a pin hole is provided on the end face of the outer blank, and a positioning pin adapted to the pin hole is provided on the support ring 22. Optionally, the pin hole includes a first pin hole 1 and a second pin hole 3, and the positioning pin includes a first positioning pin 11 and a second positioning pin 15. The first pin hole 1 is used to insert the first positioning pin 11, and the second pin hole 3 is used to insert the second positioning pin 15.

[0045] This invention provides a method for machining an outer casing of a motor housing. Before step S100, the method includes step S90, in which the A end face 5 of the outer casing blank is fixed upwards on a machining fixture, and a pin hole is machined on the A end face 5. The function of the pin hole is as described above and will not be repeated here.

[0046] In some embodiments, the support block includes a first support block 12, a second support block 13, and a third support block 14 of the same shape, which are spaced apart. The top of the support block has a slope, and the support block is mounted on a support ring 22. The extension line connecting the highest and lowest points of the slope of the support block passes through the axis of the outer blank, and the lowest point of the slope is closer to the outer blank than the highest point. After the outer blank is fixed on the slope of the support block, the lower part of the slope is separated from the A-end face of the outer blank, allowing the back boring tool sufficient space to machine the A-side step.

[0047] In addition, the machining fixture also includes an air pipe 20, which has several branches with nozzles 21 installed on them. The nozzles 21 are used to blow air to clean the machining process. The nozzles 21 can remove debris from the surface of the blank and also cool the cutting part of the blank, maintaining the working temperature of the tool and extending its service life.

[0048] It should be noted that in the description of this invention, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0049] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] In the description of this invention, the terms "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0052] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of the invention pertain.

[0053] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0054] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for processing an outer casing of a motor housing, characterized in that, include: Step S100: Fix the A end face (5) of the outer casing blank of the motor housing downwards on the machining fixture; Before step S100, step S90 is also included, in which the A end face 5 of the outer blank is facing upward and fixed on the machining fixture, and a pin hole is machined on the A end face 5. Step S200: Use the first boring tool to machine the inner hole of the outer sleeve (4); Step S300: Use the second boring tool to machine the B-side step (6); Step S400: Use a back boring tool to machine the step on surface A (2); The processing fixture includes a base plate, several support blocks, several cylinders and several pressure plates. The base plate has a through hole in the middle. The support blocks are arranged around the through hole. The cylinders are mounted on the base plate. The pressure plates are fixedly connected to the push rods of the cylinders. The support blocks are used to place the outer blank. The pressure plates are used to clamp the end face of the outer blank. The machining fixture also includes a support ring (22), which is coaxially mounted on the base plate with the through hole; a pin hole is provided on the A end face (5), and a positioning pin adapted to the pin hole is provided on the support ring (22); the top of the support block has an inclined surface, and the support block is mounted on the support ring (22); The extension of the line connecting the highest and lowest points of the inclined plane passes through the axis of the outer blank, and the lowest point of the inclined plane is closer to the outer blank than the highest point.

2. The method for processing an outer casing of a motor housing according to claim 1, characterized in that, The pressure plate includes a first pressure plate (7), a second pressure plate (8), and a third pressure plate (9), which are spaced apart and point towards the axis of the outer blank.

3. The method for processing an outer casing of a motor housing according to claim 1, characterized in that, The pin hole includes a first pin hole (1) and a second pin hole (3), and the positioning pin includes a first positioning pin (11) and a second positioning pin (15). The first pin hole (1) is used to insert the first positioning pin (11), and the second pin hole (3) is used to insert the second positioning pin (15).

4. The method for processing an outer casing of a motor housing according to claim 1, characterized in that, The support block includes a first support block (12), a second support block (13), and a third support block (14) of the same shape, which are spaced apart.

5. The method for processing an outer casing of a motor housing according to any one of claims 1 to 4, characterized in that, The processing fixture also includes an air pipe (20), which has several branches and nozzles (21) on the branches. The nozzles (21) are used to blow air to clean the processing process.

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