A method for machining an inclined hole of a front cover housing

Abstract

The application provides a method for processing an inclined hole of a front cover shell, the front cover shell is fixed on a support platform of a clamp, the axis of the inclined hole is parallel to the XZ plane, then the front cover shell is rotated by 90 degrees, the axis of the inclined hole is parallel to the XY plane, the axis of the inclined hole is at an angle alpha with the XZ plane, the connecting head is rotated, the angle beta between the axis of the cutter and the XZ plane is equal to alpha, the X axis, the Y axis and the Z axis of the machine tool are controlled to move, the distance between the end surface of the cutter and the end surface of the inclined hole is L, the axis of the cutter is coaxial with the axis of the inclined hole, the cutter is started to rotate, the X axis and the Y axis of the machine tool are controlled to move to interpolate, the axis of the inclined hole is always coaxial with the axis of the cutter and the inclined hole is processed by the cutter. The application can realize integrated processing of the inclined hole in the front cover shell, the front cover shell only needs to be fed in the X axis direction and the Y axis direction in the processing feeding process, the Z axis feeding is not needed, and the inclined hole is convenient to process.

Description

Technical Field

[0001] This invention relates to the field of automotive parts processing technology, specifically to a method for processing inclined holes in a front cover housing. Background Technology

[0002] The front cover is usually an engine cover or decorative cover. It is an important component of the car engine. It is installed on the engine and can shield it from dust, moisture, oil and foreign objects, preventing contamination of precision components such as spark plugs and solenoid valves, thereby reducing the risk of corrosion and short circuits. At the same time, it can protect key engine components, reduce noise, improve aesthetics and ease of maintenance.

[0003] For example, Chinese patent document No. 202110737970.X, published on September 17, 2021, discloses a front cover and its processing method. The front cover processing method includes a first, a second, and a third processing step. The first processing step includes: clamping the front cover body to be processed on a first processing center for processing; the second processing step includes: clamping the front cover body processed in the first processing step on a second processing center for processing; and the third processing step includes: clamping the front cover body processed in the second processing step on a third processing center for processing.

[0004] The aforementioned literature describes a process in the machining of the front cover of an automobile engine, where multi-faceted machining is achieved through rotary machining at machining centers of different processes. This eliminates positioning errors and adjusts the process cycle time, thus solving the problems of poor dimensional stability and uneven cycle time in traditional processes. However, for the machining of holes in components with special requirements in the front cover, such as the machining of inclined holes in protrusions, which are easy to fix at an angle, this process cannot be implemented. In the machining field, because the inclined holes are set at an angle, if the surface to be machined is placed horizontally and then machined with a tool on a horizontal surface, the inclined tool cannot reliably act on the surface to be machined due to the lack of reliable support after the tool is placed, resulting in poor machining effect. If multiple machining operations are used, the entire structure will be more complex and the machining efficiency will be low. Summary of the Invention

[0005] The purpose of this invention is to provide a method for machining inclined holes in a front cover housing, which can achieve integrated machining of inclined holes in the front cover housing. During the machining feed process, the front cover housing only needs to be fed in the X-axis and Y-axis directions, and does not require Z-axis feed, which facilitates the machining of inclined holes.

[0006] This invention provides the following technical solution: a method for machining inclined holes in a front cover housing, comprising the following steps: S1. Fix the front cover housing on the support platform of the fixture, so that the bottom surface of the front cover housing is parallel to the XY plane and parallel to the upper surface of the support platform. At the same time, ensure that the axis of the inclined hole is parallel to the XZ plane. Then, drive the support platform and the front cover housing to rotate 90° through the driving device of the fixture, so that the front cover housing is in the vertical plane, the axis of the inclined hole is parallel to the XY plane, and the axis of the inclined hole makes an angle α with the XZ plane, where 10° < α < 30°.

[0007] S2. Using the XZ plane as the reference plane, rotate the connector of the tool assembly so that the axis of the tool on the connector is parallel to the reference plane.

[0008] S3. Rotate the connector head so that the axis of the tool and the clamp β of the XZ plane are equal to α.

[0009] S4. Control the X, Y and Z axes of the machine tool to make the distance between the end face of the tool and the end face of the inclined hole L, and make the axis of the tool coaxial with the axis of the inclined hole.

[0010] S5. Start the tool to rotate, control the X and Y axis interpolation motion of the machine tool to keep the axis of the inclined hole coaxial with the axis of the tool, and process the inclined hole with the tool. The tool is a forming tool corresponding to the size of the inclined hole, and the axis of the tool is perpendicular to the axis of the machine tool spindle.

[0011] The above method, because the inclined hole to be machined on the front cover housing is inclined upwards relative to the bottom surface of the front cover housing, and the front cover housing is an irregular part, requires fixing the front cover housing to a fixture first to facilitate machining and ensure coordination with the machining tool, while ensuring that the axis of the inclined hole is parallel to the XZ plane. After horizontally fixing the front cover housing to the support platform, the support platform is rotated into a vertical plane, i.e., the XZ plane, using the fixture. The tool assembly is then positioned on one side of the XZ plane where the fixture is located, allowing the protruding part of the front cover housing with the inclined hole to be positioned outwards within the XZ plane. Then, the support... After the platform rotates, the XZ plane becomes the reference plane. This allows the cutting tool to be rotated at the preset tilt angle of the inclined hole using a rotating head, aligning the tool with the machining position within the reference plane. After the housing is rotated 90°, the axis of the inclined hole is parallel to the XY plane. During machining, since the tool is aligned with the axis of the inclined hole in the Z-axis direction, only the X and Y axes of the machine tool need to feed together, ensuring the feed path is parallel to the tool's axis, to machine the inclined hole in one pass. This improves machining efficiency and accuracy. When the included angle α is between 10° and 30°, the feed distance of the X-axis is greater than that of the Y-axis per unit time, resulting in better operability.

[0012] Furthermore, one end of the mounting base in the tool assembly is connected to the spindle of the machine tool, and the other end of the mounting base is rotatably connected to one end of the connector. The connector is rotatably set in the horizontal plane around the axis of the mounting base. The connector is L-shaped, and the tool is connected to the other end of the connector.

[0013] The above settings facilitate rotating the connector to adjust the deflection angle of the tool, thereby aligning it with the inclined hole to be machined.

[0014] Furthermore, the tool assembly includes a limiting component, which is located on the outside of the connector and near the end connected to the rotating seat. The limiting component includes a fixing ring, an elastic element, a sleeve body, a limiting post, a positioning post, and a washer. The fixing ring is fixedly sleeved on the outside of the connector after passing through a first positioning hole on the outside of the fixing ring by a fixing element. The positioning element passes through a second positioning hole on the outside of the fixing ring to limit and fix the lower part of the limiting post located in the through hole of the fixing ring. The sleeve body is movably sleeved on the limiting post. The two ends of the elastic element are respectively connected to the top of the fixing ring and the internal step of the sleeve body. The washer is screwed to the outside of the sleeve body. The upper part of the limiting post protrudes from the sleeve body.

[0015] The above configuration allows the fixing ring to be fixed to the outside of the connector by the fixing component, thus making the fixing component and the connector an integral unit. The positioning component can fix the limiting post in the through hole of the fixing ring. At the same time, the elastic component allows the sleeve to abut against the limiting block set on the machine tool under the guidance of the limiting post. This facilitates the limiting block to limit the protruding limiting post, thereby preventing the integral structure formed by the connector and the limiting component from rotating during the tool processing. In other words, it plays a locking and limiting role for the tool after rotation and deflection.

[0016] Furthermore, a positioning protrusion is provided on one side of the sleeve body, and a third positioning hole is provided on the positioning protrusion. A positioning post set on the fixing ring protrudes through the third positioning hole and is positioned on the positioning protrusion. One end of the positioning protrusion is embedded in the limiting cavity located outside the rotating seat.

[0017] The above configuration uses the positioning pin to limit the sleeve body and the rotating seat to limit the positioning protrusion. This double limitation prevents the sleeve body from rotating around the positioning pin. As a result, the overall structure of the limiting component can limit the positioning pin through the positioning hole and the sleeve body through the rotating seat, thereby improving the stability of the locking connector through limiting at different positions.

[0018] Furthermore, a limiting block is provided on one side of the rotating seat at the machine tool position. The limiting block is fixed to the machine tool by a locking member passing through the fourth positioning hole of the limiting block. The limiting block is provided with two or more limiting parts that protrude upward from the limiting block, and the limiting parts form a limiting opening that matches the upper part of the limiting post.

[0019] The above settings enable the limiting port to limit the limiting post, preventing the connector from rotating, thereby indirectly locking the tool after it has rotated by an angle.

[0020] Furthermore, the cutting tool includes a first cutting body, a second cutting body, and a third cutting body. The first cutting body is connected to the connector. An inclined surface is formed between the first cutting body and the second cutting body. A protruding first blade is provided on the inclined surface. One end of the first blade extends from the first cutting body through the inclined surface to the second cutting body. A stepped portion is formed between the second cutting body and the third cutting body. One end of the second blade located on the second cutting body extends from the second cutting body to the stepped portion. The end of the third cutting body is provided with a guide bevel.

[0021] The above setup allows the first machining hole, the second machining hole, and the chamfered portion in the inclined hole to be machined to be integrally formed by the third cutting tool body, the first cutting tool, and the second cutting tool.

[0022] Furthermore, in S1, the front cover housing fixed on the support platform rotates 90° toward the side closer to the tool.

[0023] The above settings facilitate the alignment of the cutting tool with the position of the inclined hole to be machined.

[0024] Furthermore, the support platform includes a support plate, a rotating plate connected to both ends of the support plate, support columns, positioning columns, and a pressing device; more than three support columns are provided on the support plate, and the pressing device is provided on the support plate; in S1, the top surface of the support column supports the bottom surface of the front cover housing, the positioning column is inserted into the positioning hole of the front cover housing, and the pressing device presses against the front cover housing.

[0025] The above setup, through the support columns and positioning columns, enables the front cover housing to be positioned quickly and accurately, and the front cover housing is pressed tightly by the clamping device.

[0026] Furthermore, one side of the front cover housing is a reference surface, which forms an angle γ with the axis of the inclined hole. A dial indicator is used on the reference surface to verify whether the installation position of the front cover housing is accurate, so as to ensure that the axis of the inclined hole is parallel to the XZ plane.

[0027] The above settings can more accurately verify whether the axis of the inclined hole is parallel to the XZ plane, thus improving the machining accuracy of the inclined hole.

[0028] Furthermore, the top surface of the front cover has a horizontal reference surface, which is the plane of the bottom surface of the front cover. A dial indicator is used to verify whether the bottom surface of the front cover is parallel to the horizontal plane by acting on the horizontal reference surface.

[0029] The above settings can verify whether the bottom surface of the front cover is parallel to the horizontal plane, thus improving machining accuracy. Attached Figure Description

[0030] Figure 1 This is a flowchart of the process of the present invention.

[0031] Figure 2 This is a schematic diagram of the front cover housing being fixed on the support platform in this invention.

[0032] Figure 3 This is a schematic diagram of the tool assembly in this invention.

[0033] Figure 4 for Figure 3 Enlarged view of point A in the image.

[0034] Figure 5 This is a schematic diagram of the tool structure in this invention.

[0035] Figure 6 This is a schematic diagram of the inclined hole to be processed in this invention.

[0036] Figure 7 This is a schematic diagram of the positioning hole in the present invention.

[0037] Figure 8 This is a front view of the positioning hole in this invention.

[0038] Figure 9 This is a top view of the positioning hole in this invention.

[0039] Figure 10 This is a schematic diagram of the front cover housing.

[0040] Figure 11 This is a three-dimensional schematic diagram of the front cover housing of the present invention.

[0041] Figure 12 This is a schematic diagram showing the front view of the front cover housing of the present invention.

[0042] Figure 13 This is a schematic diagram of the left-side view of the front cover housing of the present invention.

[0043] Figure 14 This is a top view of the front cover housing of the present invention. Detailed Implementation

[0044] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0045] like Figure 1-9As shown, this invention provides a method for machining an inclined hole in a front cover housing. This is achieved through a tool assembly mounted on a machine tool spindle and a fixture 2 for fixing the front cover housing 1. In this invention, a CNC milling machine is used. The tool assembly includes a tool, a rotating base 3, a connecting head 4, and a limiting assembly. One end of the rotating base 3 is connected to the machine tool spindle, and the other end of the rotating base 3 is rotatably connected to one end of the connecting head 4. The rotating base 3 uses a standard Morse taper shank. The connecting head 4 is L-shaped and rotates around the axis 34 of the rotating base 3 in a horizontal plane. The tool is connected to the other end of the connecting head 4. When the tool assembly is mounted on the machine tool spindle, the axis of the tool is parallel to the horizontal plane, which facilitates rotating the connecting head 4 to adjust the deflection angle of the tool and align it with the inclined hole A3 to be machined. In this invention, the tool is a forming tool.

[0046] The fixture 2 is mounted on the machine tool's worktable, which is movable in the X-axis and Y-axis directions. The fixture 2 includes a base 21, support seats 22, a drive unit 23, and a support platform 24. The base 21 is mounted on the X-axis worktable 20, and support seats 22 are fixed at both ends of the base 21. The drive unit 23 is mounted on one of the support seats 22. The support platform 24 includes a support plate 241, rotating plates 242 connected to both ends of the support plate, support columns 243, positioning columns 244, and a clamping device 245. One rotating plate 242 is rotatably mounted on one support seat 22 via bearings and a shaft, while the other rotating plate 242 is connected to the drive shaft of the drive unit 23. Three or more support columns 243 and three or more support columns 244 that can be inserted into the positioning holes of the front cover housing are provided on the support plate 241. The clamping device 245 is mounted on the support plate 241 and uses an existing clamping device.

[0047] The drive device 21 is a drive motor that drives the support platform to rotate. In this embodiment, a double-axis bearing is provided at the upper end of the connector 4, the rotating seat 3 passes through the double-axis bearing, and a vertical bevel gear is provided on the lower bearing. A horizontal bevel gear is connected to the vertical bevel gear. The meshing of the vertical and horizontal bevel gears drives the tool head 5 to rotate. The first tool body 22 of the tool is connected to the tool head 5. The upper end of the rotating seat 3 is mounted on the spindle of the machine tool. The spindle of the machine tool drives the rotating seat 3 to rotate. The rotation of the connector 3 is limited by the limiting component. The specific structure of the rotating seat 3 and the connector 4 is similar to that disclosed in patent application number CN202610131672.9.

[0048] like Figure 3-4As shown, the limiting assembly is located on the outside of the connector 4 and near the end connected to the rotating seat 3. The limiting assembly includes a fixing ring 6, an elastic element 7, a sleeve body 8, a limiting post 9, a positioning post 10, and a washer 11. The fixing ring 6 is fixedly sleeved on the outside of the connector 4 after passing through the first positioning hole on the outside of the fixing ring 6 through the fixing element 12. The lower part of the limiting post 9, which is located in the through hole of the fixing ring 6, is limited and fixed by the positioning element (not shown in the figure) passing through the second positioning hole 13 on the outside of the fixing ring 6. The sleeve body 8 is movably sleeved on the limiting post 9. The two ends of the elastic element 7 are respectively connected to the top of the fixing ring 6 and the internal step of the sleeve body 8. The washer 11 is threaded... A spiral connection is provided on the outside of the sleeve body 8, and the upper part of the limiting post 9 protrudes from the sleeve body 8. This allows the fixing ring 6 to be fixed to the outside of the connector 4 via the fixing member 12, thus making the fixing member 12 and the connector 4 an integral unit. The positioning member fixes the limiting post 9 within the through hole of the fixing ring 6. Simultaneously, the elastic member 7 guides the sleeve body 8, which, under the guidance of the limiting post 9, abuts against the limiting block 16 on the machine tool. This facilitates the limiting block 16 in limiting the protruding limiting post 9, preventing the integral structure formed by the connector 4 and the limiting assembly from rotating during tool processing, effectively locking and limiting the tool after rotational deflection. In this embodiment, two fixing members 12, two first positioning holes, two positioning members, and two second positioning holes 13 are provided, and the fixing member 12 and the positioning member are locking bolts.

[0049] like Figure 4 As shown, a positioning protrusion 14 is provided on one side of the sleeve body 8. The positioning protrusion 14 has a third positioning hole. The positioning post 10, which is set on the fixing ring 6, protrudes from the positioning protrusion 14 through the third positioning hole (not shown in the figure). One end of the positioning protrusion 14 is embedded in the limiting cavity 15 located outside the rotating seat 3. In this way, the positioning post 10 can limit the sleeve body 8, and the rotating seat 3 can limit the positioning protrusion 14. The double limiting can prevent the sleeve body 8 from rotating around the limiting post 9. Therefore, for the overall structure of the limiting component, the limiting post 9 can be limited by the positioning hole, and the sleeve body 8 can be limited by the rotating seat 3. Thus, the stability of the locking connector 4 is improved by limiting at different positions.

[0050] like Figure 4 , Figures 7-9As shown, a limiting block 16 is provided on one side of the rotating seat 3 at the machine tool position. The limiting block 16 is fixed to the machine tool by a locking element (not shown in the figure) passing through the fourth positioning hole 17 of the limiting block 16. The locking element can be a bolt. There are two fourth positioning holes 17, which are located at both ends of the positioning block. The limiting block 16 has two or more limiting parts 18 that protrude upward from the limiting block 16. The limiting parts 18 form a limiting opening 19 that matches the upper part of the limiting post 9. The two sides inside the limiting opening 19 are first guide slopes 20a. The upper part of the column 9 is provided with a second guide slope 21a that is parallel to the first guide slope 20a. In this way, when the overall structure of the limiting component is installed, the limiting column 9 can be made to abut against the limiting port 19. Then, the limiting part 18 can limit the left and right sides of the limiting column 9 to prevent the limiting column 9 from rotating. This indirectly locks the tool after the rotation deflection angle, ensuring that the connector 4 and the tool connected to the connector 4 do not rotate around the axis 34 of the rotating seat 3 in the horizontal plane, thus ensuring the machining accuracy of the tool processing.

[0051] like Figure 5-6 As shown, the cutting tool includes a first cutting body 22a, a second cutting body 23a, and a third cutting body 24a. The first cutting body 22a is connected to the cutting head 5. An inclined surface 29 is formed between the first cutting body 22a and the second cutting body 23a. A protruding first blade 25 is provided on the inclined surface 29. One end of the first blade 25 extends from the first cutting body 22a through the inclined surface 29 to the second cutting body 23a. A stepped portion 27 is formed between the second cutting body 23a and the third cutting body 24a. One end of the second blade 26 located on the second cutting body 23a extends from the second cutting body... The third cutting tool 24a extends to the stepped portion 27. The end of the third cutting tool 24a is provided with a cutting edge 28. The third cutting tool 24a, the first cutting edge 25, and the second cutting edge 26 can integrally machine the first machining hole 30, the second machining hole 31, and the chamfered portion 32 in the inclined hole A3 to be machined. In this embodiment, the first cutting edge 25 and the second cutting edge 26 are both integrally formed cutting edges, fixed to different positions on the cutting tool by welding. The chamfered portion 32 of the first cutting edge 25 is inclined towards the side closer to the axis of the first cutting tool 22a relative to the outer side of the first cutting tool 22a, with an inclination angle of b, to conform to the shape requirements of the inclined hole A3 to be machined.

[0052] like Figure 1 As shown, the method for machining the inclined hole in the front cover housing in this embodiment specifically includes the following steps: S1. The support plate 241 is made parallel to the horizontal plane by the drive device 23. Figures 11 to 14In this configuration, the horizontal plane is the XY plane. The front cover housing 1 is fixed to the support platform of the clamp 2, specifically by: supporting the bottom surface of the front cover housing with the top surface of the support column 243 to ensure that the bottom surface of the front cover housing is parallel to the horizontal plane; inserting the positioning column 244 into the positioning hole of the front cover housing; and pressing the clamping device onto the front cover housing 1. This allows for multiple degrees of freedom limitation of the front cover housing. After the front cover housing is installed, one side of the front cover housing serves as the reference surface 100, such as... Figure 10 As shown, the reference surface 100 forms an angle γ with the axis of the inclined hole. A dial indicator is used on the reference surface to verify the accuracy of the front cover housing's installation position, ensuring that the axis of the inclined hole is parallel to the XZ plane. Specifically, the dial indicator's base is magnetically attached to the machine tool spindle. By moving the X-axis work platform and using trigonometric functions for conversion, the parallelism of the inclined hole's axis to the XZ plane is determined. Of course, a parallelism error of ±0.1mm is permissible at this point. Using trigonometric functions for conversion is existing technology. Simultaneously, the top surface of the front cover housing has a horizontal reference surface 200, which is the plane of the front cover housing's bottom surface. A dial indicator is used on the horizontal reference surface to verify whether the bottom surface of the front cover housing is parallel to the horizontal plane. The method for using the dial indicator is the same as the method for verifying the axis of the inclined hole described above. Through the above methods, the accuracy of the front cover housing's installation can be verified.

[0053] Thus, as Figures 11 to 14 As shown, the bottom surface of the front cover housing 1 can be placed on a horizontal plane and parallel to the support platform. Then, the support platform is rotated 90° by the driving device of the clamp 2, so that the front cover housing 1 is in the vertical plane, i.e., the XZ plane. The axis F of the inclined hole is parallel to the XY plane, and the axis of the inclined hole makes an angle α with the XZ plane, where 10° < α < 30°. In this example, α is 15°.

[0054] S2. Using the vertical plane (XZ plane) where the support platform is located after rotating 90° as the reference plane, loosen the fixing member 12, rotate the connector 4 so that the tool on the connector 4 is parallel to the reference plane, rotate the connector 4 again so that the angle after the tool on the connector rotates to the side closer to the reference plane is equal to the preset tilt angle of the tilting hole, tighten the fixing member 12. At this time, the axis of the tool and the clamp β of the XZ plane are equal to α, so that the fixing ring 6 is fixed on the outside of the connector 4. This allows the overall structure of the limiting component to be fixed on the outside of the connector 4, forming an integral part with the connector 4, thereby limiting and locking the connector 4 after the rotation angle, preventing the connector 4 from shifting at an angle during the tool processing process, which would affect the processing accuracy. In this embodiment, as Figure 6As shown, the bottom surface 33 of the front cover housing is set parallel to the support platform. After the front cover housing is rotated into the vertical plane by the support platform, the rotating seat 3 is in a vertical state. Then, the fixing member 12 is released to release the restriction between the rotating seat 3 and the limiting component. Then, it is manually rotated to be set parallel to the vertical plane. The angle of the position parallel to the vertical plane is recorded as 0° by the measuring ruler below the fixing member 12 on the rotating seat. Then, the rotating seat 3 is rotated to the position with a scale of 15° on the measuring ruler. This ensures that after rotation, the tool on the rotating seat 3 forms an angle with the vertical plane that is the same as the preset tilt angle of the tilting hole.

[0055] S3. Adjust the tool position using the machine tool. (See details below.) Figure 6 First, the tool moves along the Z-axis moving module to be at the same height and aligned with the position of the inclined hole A3 to be processed. Then, it moves simultaneously along the X-axis moving module and the Y-axis moving module. The actual movement direction of the tool after the synchronous movement of the X-axis moving module and the Y-axis moving module is along the axis 34 of the inclined hole A3 to be processed. The first processing hole 30, the second processing hole 31 and the chamfer 32 in the inclined hole A3 to be processed are processed in sequence. Specifically, the first processing hole 30 is processed by the first tool body 22, the second processing hole 31 is processed by the second insert based on the hole processed by the first tool body 22, and the chamfer 32 is processed by the first insert 25 based on the hole processed by the second insert. The inclined hole A3 to be processed is formed in one piece. This can ensure that the position of the tool does not deviate, thereby avoiding affecting the processing accuracy. At the same time, the different processing parts in the inclined hole can be processed in one piece by using an integrated tool, which can improve the processing efficiency while ensuring the processing accuracy.

[0056] S4. After the tool moves to a preset distance L along the axis of the inclined hole A3 to be machined, stop the tool rotation. The machine tool drives the tool to move in the opposite direction and disengage from the machined inclined hole, thus completing the inclined hole machining.

[0057] Because the inclined hole to be machined on the front cover housing is inclined upwards relative to the bottom surface of the front cover housing, and the front cover housing is an irregular part, in order to facilitate machining and cooperate with the machining tool, it is necessary to first fix the front cover housing on the fixture, ensuring that the axis of the inclined hole is parallel to the XZ plane. After fixing the front cover housing horizontally on the support platform, the support platform is rotated into the vertical plane, i.e., the XZ plane, using the fixture. Then, the tool assembly is located on one side of the XZ plane where the fixture is located, so that the protrusion of the front cover housing with the inclined hole is set outwards in the XZ plane. Then, the support platform... The XZ plane after rotation serves as the reference plane. This allows the cutting tool to be rotated at the preset tilt angle of the hole to be machined via the rotating head, aligning the tool with the machining position within the reference plane. After the housing has been rotated 90°, the axis of the tilted hole is parallel to the XY plane. During machining, since the tool is already aligned with the axis of the tilted hole in the Z-axis direction, only the X and Y axes of the machine tool need to feed together, ensuring the feed path is parallel to the tool's axis, to machine the tilted hole in one pass, thus improving machining efficiency and accuracy. When the included angle α is within 15°, the feed distance of the X-axis is greater than that of the Y-axis per unit time, resulting in better operability.

Claims

1. A method for machining an inclined hole in a front cover housing, characterized in that: Includes the following steps: S1. Fix the front cover housing on the support platform of the fixture, so that the bottom surface of the front cover housing is parallel to the XY plane and parallel to the upper surface of the support platform, while ensuring that the axis of the inclined hole is parallel to the XZ plane. Then, drive the support platform and the front cover housing to rotate 90° through the driving device of the fixture, so that the front cover housing is in the vertical plane, the axis of the inclined hole is parallel to the XY plane, and the axis of the inclined hole makes an angle α with the XZ plane, where 10° < α < 30°. S2. Using the XZ plane as the reference plane, rotate the connector of the tool assembly so that the axis of the tool on the connector is parallel to the reference plane. S3. Rotate the connector head so that the axis of the tool and the clamp β of the XZ plane are equal to α; S4. Control the X, Y and Z axes of the machine tool to make the distance between the end face of the tool and the end face of the inclined hole L, and make the axis of the tool coaxial with the axis of the inclined hole. S5. Start the tool to rotate, control the X and Y axis interpolation motion of the machine tool to keep the axis of the inclined hole coaxial with the axis of the tool, and process the inclined hole with the tool. The tool is a forming tool corresponding to the size of the inclined hole, and the axis of the tool is perpendicular to the axis of the machine tool spindle.

2. The method for machining an inclined hole in a front cover housing according to claim 1, characterized in that: One end of the mounting base in the tool assembly is connected to the spindle of the machine tool, and the other end of the mounting base is rotatably connected to one end of the connector. The connector is set to rotate in the horizontal plane around the axis of the mounting base. The connector is L-shaped, and the tool is connected to the other end of the connector.

3. The method for machining an inclined hole in a front cover housing according to claim 1, characterized in that: The tool assembly includes a limiting component, which is located on the outside of the connector and near the end connected to the mounting base. The limiting component includes a fixing ring, an elastic element, a sleeve body, a limiting post, a positioning post, and a washer. The fixing ring is fixedly sleeved on the outside of the connector after passing through a first positioning hole on the outside of the fixing ring by a fixing element. The positioning element passes through a second positioning hole on the outside of the fixing ring to limit and fix the lower part of the limiting post located in the through hole of the fixing ring. The sleeve body is movably sleeved on the limiting post. The two ends of the elastic element are respectively connected to the top of the fixing ring and the internal step of the sleeve body. The washer is screwed to the outside of the sleeve body. The upper part of the limiting post protrudes from the sleeve body.

4. The method for machining an inclined hole in a front cover housing according to claim 3, characterized in that: The sleeve body is provided with a positioning protrusion on one side, and a third positioning hole is provided on the positioning protrusion. The positioning post set on the fixing ring passes through the third positioning hole and protrudes from the positioning protrusion. One end of the positioning protrusion is embedded in the limiting cavity located outside the mounting base.

5. The method for machining an inclined hole in a front cover housing according to claim 2, characterized in that: The mounting base is provided with a limiting block on one side at the machine tool position. The limiting block is fixed to the machine tool by a locking member passing through the fourth positioning hole of the limiting block. The limiting block is provided with two or more limiting parts that protrude upward from the limiting block, and the limiting parts form a limiting opening that matches the upper part of the limiting post.

6. The method for machining an inclined hole in a front cover housing according to claim 1, characterized in that: The cutting tool includes a first cutting body, a second cutting body, and a third cutting body. The first cutting body is connected to a connector. An inclined surface is formed between the first cutting body and the second cutting body. A protruding first blade is provided on the inclined surface. One end of the first blade extends from the first cutting body through the inclined surface to the second cutting body. A stepped portion is formed between the second cutting body and the third cutting body. One end of the second blade located on the second cutting body extends from the second cutting body to the stepped portion. The end of the third cutting body is provided with a guide bevel.

7. The method for machining an inclined hole in a front cover housing according to claim 1, characterized in that: In S1, the front cover housing, which is fixed on the support platform, rotates 90° toward the side closer to the tool.

8. The method for machining an inclined hole in a front cover housing according to claim 1, characterized in that: The support platform includes a support plate, a rotating plate connected to both ends of the support plate, support columns, positioning columns, and a pressing device; three or more support columns are provided on the support plate, and the pressing device is provided on the support plate; in S1, the top surface of the support column supports the bottom surface of the front cover housing, the positioning column is inserted into the positioning hole of the front cover housing, and the pressing device presses against the front cover housing.

9. A method for machining an inclined hole in a front cover housing according to claim 8, characterized in that: One side of the front cover housing is a reference surface. The reference surface is at an angle γ to the axis of the inclined hole. A dial indicator is used on the reference surface to check whether the installation position of the front cover housing is accurate to ensure that the axis of the inclined hole is parallel to the XZ plane.

10. A method for machining an inclined hole in a front cover housing according to claim 8, characterized in that: The top surface of the front cover has a horizontal reference surface, which is the plane of the bottom surface of the front cover. A dial indicator is used to check whether the bottom surface of the front cover is parallel to the horizontal plane by acting on the horizontal reference surface.

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