A machining process for rapidly machining a bearing seat

Abstract

The application discloses a machining process for rapidly machining a bearing seat, four processes are relatively concentrated, which is favorable for unification of process datum and positioning datum, meanwhile, the machining process reduces intermediate turnover links, four devices (three horizontal devices and one vertical device) can be reasonably arranged for production, and turnover space is reduced.

Description

Technical Field

[0001] This invention relates to the field of bearing housing processing, and more specifically to a rapid processing technology for bearing housings. Background Technology

[0002] Current sliding bearing housings are divided into upper and lower housings. During machining, the upper and lower housings are processed separately, and then assembled by splicing. Because the assembly precision between sliding bearing housings is relatively high, multiple processes are used to ensure the accuracy of the upper and lower housings during machining. Previously, upper housing machining mainly included rough and fine machining of the assembly surface, fine machining of the top surface, machining of mounting holes, spherical surfaces, and stops. Each of these processes required a separate machine tool. The lower housing machining also required the same steps, resulting in a large number of machine tools and multiple transfers of the workpiece between machines. This not only increased the workload of the workers but also amplified errors through multiple clamping operations, affecting subsequent assembly. Furthermore, multiple machine tools increased the required workspace. Summary of the Invention

[0003] To address the shortcomings of the existing technologies, this invention proposes a rapid machining process for bearing housings. The four processes are relatively concentrated, which is conducive to the unification of process and positioning references. At the same time, it reduces intermediate turnover links. The unit production of four machines (three horizontal and one vertical) can achieve reasonable production arrangement and reduce turnover space.

[0004] To achieve the above objectives, the present invention provides a rapid machining process for bearing housings.

[0005] Step 1: An exchange table is set up in the first horizontal machining center. The upper and lower bearing seats are clamped on the exchange table. The work position is switched by rotating the exchange table. The clamping of the upper seat uses three points on the upper seat flange surface, two points on the assembly surface, and one point on the outer wall as positioning references. The horizontal machining center is used to rough mill the assembly surface of the upper seat, and machine all the holes on the assembly surface and the first positioning pin hole. The horizontal machining center is used to finish mill the top surface of the upper seat and machine the hole system on the top surface of the upper seat, and open the oil drain groove of the upper seat. The exchange table rotates the lower seat to the machining position of the horizontal machining center. The clamping of the lower seat uses three points on the lower seat flange surface, two points on the assembly surface, and one point on the outer wall as positioning references. The horizontal machining center is used to rough mill the assembly surface of the lower seat, and machine all the holes on the assembly surface and the second positioning pin hole. The horizontal machining center is used to finish mill the bottom surface of the lower seat and machine the hole system on the bottom surfaces of the upper and lower seats. The third positioning pin hole is added by drilling and countersinking processes. Finally, the threaded holes on both sides are machined, and the oil drain groove of the lower seat is opened.

[0006] Step 2: A changeover table is also set up in the second horizontal machining center. The upper and lower bearing seats are respectively clamped on the changeover table. The work position is switched by rotating the changeover table. The upper seat is machined by rough milling the two end faces, mounting holes, stop, and spherical surface of the upper seat using the assembly surface and the first locating pin hole on the assembly surface of the upper seat as the positioning reference. The hole system on the two end faces of the upper seat is machined, and the stop is semi-finished and finished milled. The changeover table rotates the lower seat to the machining position of the horizontal machining center. The lower seat is machined by rough milling the two end faces, mounting holes, stop, and spherical surface of the lower seat using the assembly surface and the second locating pin hole on the assembly surface of the lower seat as the positioning reference. The hole system on the two end faces of the lower seat is machined, and the stop is semi-finished and finished milled.

[0007] Step 3: The upper and lower bearing housings are clamped in the same vertical machining center with their assembly surfaces facing upwards. The upper housing uses its top surface and the hole system on the top surface of the upper housing as positioning references. The assembly surface of the upper housing is machined by semi-finish milling and finish milling of the vertical machining center. The lower housing uses its bottom surface and the third positioning pin hole on the bottom surface of the lower housing as positioning references. The assembly surface of the lower housing is machined by semi-finish milling and finish milling of the vertical machining center.

[0008] Step 4: Attach the upper and lower seats together and secure them with pins. After assembly, clamp the upper and lower seats onto the third horizontal machining center. Using the bottom surface of the lower seat and the fourth locating pin hole as the positioning reference, semi-finish mill the mounting hole, the lower seat stop, and the end faces of the upper and lower seats. Machin the third locating pin hole on the end faces of the upper and lower seats. Finish mill the lower seat stop and the end faces of the upper and lower seats. Finish bore the mounting hole.

[0009] Preferably, the two first positioning pin holes on the assembly surface of the upper seat in process one serve as positioning references for the roughing and finishing milling surfaces in processes two and three, ensuring the positional accuracy and consistency of the remaining holes in subsequent processes. The lower seat is designed with two additional third positioning pin holes on the bottom surface. The subsequent processing of the lower seat uses the third positioning pin holes on the bottom surface as positioning references, ensuring the positional accuracy and consistency of the remaining holes in processes two, three, and four of the lower seat. This design is suitable for batch processing, ensuring quality and rapid adjustment.

[0010] Preferably, in the first step, the assembly surface of the upper seat is rough milled, leaving a margin. The assembly surface of the upper seat is then fixed, drilled, and countersunk as the first positioning pin holes and assembly holes for the next two steps. The turntable clamping the upper seat is rotated 180°, and the top surface of the upper seat is finely milled to ensure that the dimensions are the same as the assembly surface. The top surface holes and threads are then drilled, countersunk, and tapped.

[0011] Preferably, in step one, the assembly surface of the lower seat is first rough milled, leaving a margin. The assembly surface of the lower seat is then fixed, drilled, and countersunk as the second positioning pin holes and assembly holes for the next two steps. The turntable clamping the lower seat is rotated 180° to finish mill the bottom surface of the lower seat, ensuring that the flatness of the bottom surface of the lower seat is less than 0.03mm, and ensuring that the dimensions of the bottom surface of the lower seat and the assembly surface of the lower seat are the same. All holes on the bottom surface and the threaded holes are drilled, countersunk, and tapped. The turntable is then rotated 90° to process the hole system on one side of the lower seat. The turntable is then rotated 180° to process the hole system on the other side.

[0012] Preferably, in step two, the end face, mounting hole, stop, and spherical surface of the upper seat are rough milled sequentially, and the hole system on the end face of the upper seat is drilled sequentially. The stop of the upper seat is semi-finished and finished milled sequentially. The turntable is rotated 180°, and the other end face, mounting hole, stop, and spherical surface of the upper seat are rough milled sequentially, and the hole system on the other end face of the upper seat is drilled. The lower seat is processed in the same way as the upper seat.

[0013] Preferably, the rough machining of the end faces and stops of the upper and lower seats in step two is to control the finishing allowance in steps three and four. Most importantly, it is to prevent workpiece deformation from causing subsequent form and position errors such as flatness, position, and cylindricity. The rough machining of the spherical end mill with a radius of radius (R) on the horizontal lathe is replaced by rough turning on the lathe.

[0014] Preferably, in step three, when semi-finish milling the upper seat assembly surface, a 0.05mm allowance is left, and the first locating pin hole and assembly hole on the upper seat assembly surface are drilled, countersunk, and reamed. The upper seat assembly surface is then finish milled to ensure that the flatness of the assembly surface is less than 0.012mm. When semi-finish milling the lower seat assembly surface, a 0.05mm allowance is left, and the second locating pin hole and assembly hole on the lower seat assembly surface are drilled, countersunk, and reamed. The lower seat assembly surface is then finish milled to ensure that the flatness of the assembly surface is less than 0.012mm. Using a single-edged insert to process the assembly surface can improve the flatness and roughness of the assembly surface by one level.

[0015] Preferably, the precision milling of the assembly surface in step three must be performed after step two. After rough milling the spherical surface, the workpiece will deform. Once the workpiece deformation is stable, the assembly surface is precision milled to better control the flatness of the assembly surface.

[0016] Preferably, in step four, the mounting hole and lower seat stop at one end of the bearing housing are semi-finish milled, leaving a 0.2mm allowance; the holes on the end face of one end of the bearing housing are drilled and tapped; the turntable is rotated 180° to semi-finish mill the mounting hole and lower seat stop at the other end of the bearing housing, leaving a allowance; the holes on the end face of the other end of the bearing housing are drilled and tapped; the turntable is rotated 180° in the opposite direction to finish mill the lower seat stop and the end face of the bearing housing, ensuring a flatness of less than 0.025mm; the mounting hole is precision bored; the turntable is rotated 180° to finish mill the lower cover stop and mounting hole at the other end of the lower seat.

[0017] Preferably, in step four, the tooling fixtures of the horizontal machining center that simultaneously process the upper and lower seats ensure that, under the conditions of consistent processing temperature, humidity, cutting fluid, and processing accuracy achieved by the same machine tool, the pin hole size and center distance of the workpieces in the same group processed together by assembling the upper and lower seats of the bearing housing are consistent. This makes it easy to ensure the assembly effect when assembling the upper and lower seats.

[0018] Compared with the prior art, the advantages of the present invention are: the four processes are relatively concentrated, which is conducive to the unification of process benchmarks and positioning benchmarks, while reducing intermediate turnover links. The four-machine unit production (three horizontal and one vertical) can achieve reasonable production arrangement and reduce turnover space. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the upper part of the present invention (bolts and positioning pins have been inserted into the holes on the assembly surface).

[0020] Figure 2 This is a schematic diagram of the lower part of the present invention. Implementation

[0021] The invention is further illustrated with the accompanying drawings.

[0022] like Figure 1-2 As shown, a rapid machining process for bearing housings is employed.

[0023] Process 1: An exchange table is set up in the first horizontal machining center. The upper and lower bearing seats are clamped on the exchange table, and the work position is switched by rotating the exchange table. The clamping of the upper seat uses three points on the flange surface, two points on the assembly surface, and one point on the outer wall as positioning references. Three points on the bottom surface of one flange limit the plane of the upper seat, while two points on the assembly surface and one point on the outer wall of the upper seat serve as positioning references. The upper seat is clamped using a one-face, two-pin positioning method, and the upper end face of the upper seat is clamped by a clamping assembly. The upper assembly surface is rough-milled using a horizontal machining center, machining all holes on the assembly surface and the first locating pin hole (the locating reference for the rear row). An oil drain groove is opened on the upper assembly. The upper assembly is clamped using a turntable, which is rotated 180°. The top surface of the upper assembly is then finish-milled on the horizontal machining center, along with the hole system on the top surface (the top surface of the upper assembly is needed as a locating reference during subsequent finish milling of the assembly surface; the machined hole system and plane ensure the accuracy of subsequent finish machining of the assembly surface). The lower assembly is then rotated to the machining position on the horizontal machining center by changing the worktable. The lower assembly is then clamped under the lower assembly. Three points on the flange face, two points on the assembly surface, and one point on the outer wall serve as positioning references (the positioning and clamping methods are the same as the upper seat). The lower seat assembly surface is rough-milled using a horizontal machining center, and all holes on the assembly surface, as well as the second positioning pin hole (which also serves as a positioning reference for subsequent steps), are machined. The lower seat oil drain groove is opened, and the lower seat is clamped using a turntable. The turntable rotates 180°, and the bottom surface of the lower seat is finish-milled using a horizontal machining center, along with the hole system on both the upper and lower seat bottom surfaces. The third positioning pin hole, which requires drilling and countersinking, is added, and then the threaded holes on both sides are machined. The above process is the main... The main purpose is to machine the positioning datum of the upper seat top surface and the lower seat bottom surface (as the positioning datum for the subsequent fine machining of the assembly surface), rough machine the assembly surface of the upper and lower seats, and drill positioning pin holes as the positioning datum for subsequent positioning. The positioning pin holes serve as the positioning datum for the subsequent machining of the stop surface, spherical surface, mounting hole and end face. The upper and lower seats are installed on a horizontal machining center at the same time, and the workpieces are processed alternately by changing the worktable. This process is relatively concentrated, and the upper and lower seats are machined on the same machine tool at the same time, which ensures the consistency of the process datum and the positioning datum.

[0024] Step Two: A changeover table is also set up in the second horizontal machining center. The upper and lower bearing seats are respectively clamped on the changeover table, and the work position is switched by rotating the changeover table. Using the assembly surface and the first locating pin hole on the upper seat assembly surface as the positioning reference, the horizontal machining center rough-mills one end face, mounting hole, stop, and spherical surface of the upper seat, leaving a allowance. The hole system on one end face of the upper seat is then machined, followed by semi-finish milling and finish milling of the stop, leaving a allowance. The upper seat is also clamped by a rotary table, and after rotating the rotary table 180°, the other end face, mounting hole, stop, and spherical surface of the upper seat are rough-milled by the horizontal machining center, leaving a allowance. The upper seat is then machined. The holes on one end face are semi-finish milled and finish milled, leaving a margin. The worktable is changed to rotate the lower seat to the machining position of the horizontal machining center. The lower seat is positioned with the assembly surface and the second locating pin hole on the assembly surface of the lower seat as the positioning reference. The end face, mounting hole, stop and spherical surface of one end of the lower seat are rough milled by the horizontal machining center, leaving a margin. The holes on one end face of the upper seat are machined, semi-finish milled and finish milled, leaving a margin. The lower seat is also clamped by the turntable. The turntable is rotated 180° and the end face, mounting hole, stop and spherical surface of the other end of the lower seat are rough milled by the horizontal machining center, leaving a margin. The holes on one end face of the lower seat are machined, semi-finish milled and finish milled, leaving a margin.

[0025] Step 3: The upper and lower bearing housings are clamped together on the same vertical machining center, with their assembly surfaces facing upwards. The upper housing uses its top surface and the hole system on its top surface as positioning references. The assembly surface of the upper housing is machined using semi-finish milling and finish milling on the vertical machining center to machine the hole system. The lower housing uses its bottom surface and the third locating pin hole on its bottom surface as positioning references. The assembly surface of the lower housing is machined using semi-finish milling and finish milling on the vertical machining center to machine the hole system. This simultaneous machining of the assembly surfaces of the upper and lower housings on the same vertical machining center facilitates subsequent assembly of the upper and lower housings and ensures the flatness of the assembly surfaces.

[0026] Step 4: Attach the upper and lower bearing seats together and secure them with pins. After assembly, clamp the upper and lower bearing seats onto the third horizontal machining center. Using the bottom surface of the lower bearing seat and the fourth locating pin hole as the positioning reference, semi-finish mill the mounting holes, the lower bearing seat stop, and the end faces of the upper and lower bearing seats. Machin the third locating pin hole on the end faces of the upper and lower bearing seats. Finish mill the lower bearing seat stop and the end faces of the upper and lower bearing seats. Finish bore the mounting holes. By assembling the bearing seats, the mounting holes, stops, and end faces are machined together to ensure the concentricity of the upper and lower bearing seats after assembly.

[0027] Furthermore: The two first locating pin holes on the assembly surface of the upper seat in process one serve as the locating references for the roughing and finishing milling surfaces in processes two and three, ensuring the positional accuracy and consistency of the remaining holes in subsequent machining, and guaranteeing the accuracy of subsequent machining; the lower seat design adds two third locating pin holes on the bottom surface, and the subsequent machining of the lower seat uses the third locating pin holes on the bottom surface as the locating references, ensuring the positional accuracy and consistency of the remaining holes in processes two, three, and four of the lower seat, suitable for batch processing, ensuring quality and rapid adjustment (by adjusting the third locating pin holes, the machining positional accuracy of the remaining holes can be adjusted, and the positional accuracy of multiple holes can be adjusted, achieving rapid adjustment).

[0028] Further: In the first process, the assembly surface of the upper seat is first rough milled, leaving a margin. On the assembly surface of the upper seat, holes are drilled, countersunk, and fixed as the first locating pin holes and assembly holes for the subsequent two processes. The turntable clamping the upper seat is rotated 180°, and the top surface of the upper seat is finish milled to ensure its dimensions are consistent with the assembly surface. Holes and threads on the top surface are drilled, countersunk, and tapped. The first locating pin hole is machined on the assembly surface of the upper seat. The first locating pin hole on the upper seat serves as the machining point for the end face, stop, and spherical surface of the upper seat. This ensures the positional accuracy of the upper seat's assembly surface relative to the end face, stop, and spherical surface. This is then followed by... During assembly, ensure that the end faces, stops, and spherical surfaces of the upper and lower seats are properly aligned after assembly to facilitate subsequent assembly. The top surface of the upper seat is precision-milled with a flat surface and machined holes. When machining the upper seat flat surface, use the precision-milled flat surface and hole system on the top surface of the upper seat as the positioning reference. The dimensions of the upper seat flat surface must be consistent with the dimensions of the upper seat assembly surface. Since the precision milling accuracy of the upper seat top surface is relatively high, ensure the flatness of the assembly surface when precision machining the upper seat assembly surface to facilitate subsequent assembly of the upper and lower seats.

[0029] Further: In step one, the assembly surface of the lower seat is first rough milled, leaving a margin (for subsequent semi-finishing and finishing). The assembly surface of the lower seat is then fixed, drilled, and countersunk as the second locating pin holes and assembly holes for the following two steps. In subsequent machining of the lower seat's end face, stop, mounting holes, and spherical surface, the second locating pin holes serve as positioning references. This ensures the positional accuracy of the end face, stop, mounting holes, spherical surface, and assembly surface, facilitating subsequent assembly. The turntable clamping the lower seat is rotated 180°, and the bottom surface of the lower seat is finish milled, ensuring the flatness of the lower seat's bottom surface is less than 0.03mm, guaranteeing the alignment of the lower seat's bottom surface with the lower seat. In the assembly process, the dimensions of the first assembly surface are drilled, countersinked, tapped, and the bottom surface holes and threaded holes are machined. In the fourth process, the upper and lower seats need to be assembled and the end faces, stops, mounting holes, and spherical surfaces are machined to ensure the concentricity of the end faces, stops, mounting holes, and spherical surfaces after the upper and lower seats are assembled. The fourth process uses the third locating pin hole on the bottom surface of the lower seat as the positioning reference to ensure the flatness of the bottom surface of the lower seat. This can improve the positional accuracy of the end faces, stops, mounting holes, and spherical surfaces, thus ensuring the quality of the bearing seat. The turntable is rotated 90° to machine the hole system on one side of the lower seat, and the turntable is rotated 180° to machine the hole system on the other side.

[0030] Further: In the second process, one end face, mounting hole, stop, and spherical surface of the upper seat are rough milled sequentially, leaving allowance. The hole system on one end face of the upper seat is drilled. Then, the stop on one end of the upper seat is semi-finished and finished milled sequentially. This process, which uses the same set of positioning references to process the end face, mounting hole, stop, and spherical surface with relatively high positional accuracy, can ensure the positional accuracy of the end face, mounting hole, stop, and spherical surface. The turntable is rotated 180° to rough mill the other end face, mounting hole, stop, and spherical surface of the upper seat, leaving allowance. The hole system on the other end face of the upper seat is drilled. The end faces, mounting holes, stops, and spherical surfaces of the upper seat at both ends are processed separately. This can avoid tool runout caused by excessively long horizontal machining tools, which would affect accuracy. At the same time, the end faces, mounting holes, stops, and spherical surfaces of the upper seat at both ends are processed on a horizontal machining center, which ensures the accuracy of the end faces, mounting holes, stops, and spherical surfaces. The lower seat is processed in the same way as the upper seat, and the principle is the same.

[0031] Further: The rough machining of the end faces and stops of the upper and lower seats in process two is to control the finishing allowance in processes three and four. Most importantly, it is to prevent workpiece deformation from causing subsequent form and position errors such as flatness, position, and cylindricity. By rough machining the end faces and stops of the upper or lower seats in process two, there is a margin for finishing after workpiece deformation, which will not affect the accuracy. The addition of a milling cutter with R-foot for rough machining of spherical surfaces on the horizontal lathe replaces the rough turning on the lathe. Machining spherical surfaces with a milling cutter with R-foot is more convenient and faster.

[0032] Further: In the third process, when semi-finish milling the upper seat assembly surface, leave a 0.05mm allowance, drill, countersink, and ream the first locating pin hole and assembly hole on the upper seat assembly surface, and finish mill the upper seat assembly surface to ensure that the flatness of the assembly surface is less than 0.012mm; when semi-finish milling the lower seat assembly surface, leave a 0.05mm allowance, drill, countersink, and ream the second locating pin hole and assembly hole on the lower seat assembly surface, and finish mill the lower seat assembly surface to ensure that the flatness of the assembly surface is less than 0.012mm, ensuring the flatness of the upper seat assembly surface and the lower seat assembly surface. This ensures that the upper seat and lower seat can be sealed when assembled; using a single-edged insert to process the assembly surface can improve the flatness and roughness of the assembly surface by one level.

[0033] Further: The precision milling of the assembly surface in step three must be performed after step two. After rough milling the spherical surface, the workpiece will deform. Once the workpiece deformation stabilizes, the assembly surface is precision milled to ensure good control of its flatness. The spherical surface on the inner wall of the upper and lower seats is milled by a milling cutter. During rough milling, the milling cutter moves to the inner wall of the upper / lower seat to process the spherical surface. However, during the processing of the spherical surface, the milling cutter squeezes the workpiece outward, causing the assembly surface of the workpiece to tilt slightly inward. This makes it impossible to guarantee the flatness of the assembly surface. Therefore, after rough milling the spherical surface, the assembly surface is precision milled again to ensure its flatness and facilitate the subsequent assembly of the upper and lower seats.

[0034] Further: In step four, the mounting hole and lower seat stop at one end of the bearing housing are semi-finish milled, leaving a 0.2mm allowance. The holes on the end face of one end of the bearing housing are drilled and tapped. The turntable is rotated 180° to semi-finish mill the mounting hole and lower seat stop at the other end of the bearing housing, leaving a allowance. The holes on the end face of the other end of the bearing housing are drilled and tapped. The turntable is rotated 180° in the opposite direction to finish mill the lower seat stop and the bearing housing end face, ensuring a flatness of less than 0.025mm. The mounting hole is precision bored. The turntable is rotated 180° to finish mill the lower cover stop and mounting hole at the other end of the lower seat. The mounting holes and lower seat stops of the upper / lower seat are semi-finish milled and finish milled respectively. Since the mounting holes and stops need to be installed with the shaft, the accuracy requirements are relatively high. The finish milling allowance is controlled by semi-finish milling first, and then the accuracy is controlled by finish milling, thus ensuring accuracy.

[0035] Furthermore: In process four, the tooling fixtures of the horizontal machining center that simultaneously process the upper and lower seats ensure that the processing temperature, humidity, cutting fluid, and processing accuracy can be achieved on the same machine tool. When the upper and lower seats of the bearing housing are assembled and processed together, the pin hole size and center distance of the same group of workpieces are consistent. It is easy to ensure the assembly effect when assembling the upper and lower seats.

Claims

1. A rapid machining process for bearing housings, characterized in that: Step 1: An exchange table is set up in the first horizontal machining center. The upper and lower bearing seats are clamped on the exchange table. The work position is switched by rotating the exchange table. The clamping of the upper seat uses three points on the upper seat flange surface, two points on the assembly surface, and one point on the outer wall as positioning references. The horizontal machining center is used to rough mill the assembly surface of the upper seat, and machine all the holes on the assembly surface and the first positioning pin hole. The horizontal machining center is used to finish mill the top surface of the upper seat and machine the hole system on the top surface of the upper seat, and open the oil drain groove of the upper seat. The exchange table rotates the lower seat to the machining position of the horizontal machining center. The clamping of the lower seat uses three points on the lower seat flange surface, two points on the assembly surface, and one point on the outer wall as positioning references. The horizontal machining center is used to rough mill the assembly surface of the lower seat, and machine all the holes on the assembly surface and the second positioning pin hole. The horizontal machining center is used to finish mill the bottom surface of the lower seat and machine the hole system on the bottom surfaces of the upper and lower seats. The third positioning pin hole is added by drilling and countersinking processes. Finally, the threaded holes on both sides are machined, and the oil drain groove of the lower seat is opened. Step 2: A changeover table is also set up in the second horizontal machining center. The upper and lower bearing seats are respectively clamped on the changeover table. The work position is switched by rotating the changeover table. The upper seat is machined by rough milling the two end faces, mounting holes, stop, and spherical surface of the upper seat using the assembly surface and the first locating pin hole on the assembly surface of the upper seat as the positioning reference. The hole system on the two end faces of the upper seat is machined, and the stop is semi-finished and finished milled. The changeover table rotates the lower seat to the machining position of the horizontal machining center. The lower seat is machined by rough milling the two end faces, mounting holes, stop, and spherical surface of the lower seat using the assembly surface and the second locating pin hole on the assembly surface of the lower seat as the positioning reference. The hole system on the two end faces of the lower seat is machined, and the stop is semi-finished and finished milled. Step 3: The upper and lower bearing housings are clamped in the same vertical machining center with their assembly surfaces facing upwards. The upper housing uses its top surface and the hole system on the top surface as the positioning reference. The assembly surface of the upper housing is machined by semi-finish milling and finish milling of the vertical machining center. The lower housing uses its bottom surface and the third locating pin hole on the bottom surface as the positioning reference. The assembly surface of the lower housing is machined by semi-finish milling and finish milling of the vertical machining center. Step 4: Attach the upper and lower seats together and secure them with pins. After assembly, clamp the upper and lower seats onto the third horizontal machining center. Using the bottom surface of the lower seat and the fourth locating pin hole as the positioning reference, semi-finish mill the mounting hole, the lower seat stop, and the end faces of the upper and lower seats. Machin the third locating pin hole on the end faces of the upper and lower seats. Finish mill the lower seat stop and the end faces of the upper and lower seats. Finish bore the mounting hole.

2. The machining process for a rapid bearing housing according to claim 1, characterized in that: The two first positioning pin holes on the assembly surface of the upper seat in process one serve as the positioning references for the roughing and finishing milling surfaces in processes two and three, ensuring the positional accuracy and consistency of the remaining holes in subsequent machining. The lower seat design adds two third positioning pin holes on the bottom surface. The subsequent machining of the lower seat uses the third positioning pin holes on the bottom surface as the positioning references, ensuring the positional accuracy and consistency of the remaining holes in processes two, three, and four of the lower seat. This design is suitable for batch processing, ensuring quality and rapid adjustment.

3. The machining process for a rapid bearing housing according to claim 2, characterized in that: In the first process, the assembly surface of the upper seat is rough milled, leaving a margin. The assembly surface of the upper seat is then fixed, drilled, and countersunk as the first positioning pin holes and assembly holes for the next two processes. The turntable clamping the upper seat is rotated 180°, and the top surface of the upper seat is finely milled to ensure that the dimensions are the same as the assembly surface. All holes and threads on the top surface are then drilled, countersunk, and tapped.

4. The machining process for a rapid bearing housing according to claim 3, characterized in that: In the first step, the assembly surface of the lower seat is rough milled, leaving a margin. The assembly surface of the lower seat is then fixed, drilled, and countersunk to serve as the second positioning pin holes and assembly holes for the next two steps. The turntable clamping the lower seat is rotated 180° to finish mill the bottom surface of the lower seat, ensuring that the flatness of the bottom surface of the lower seat is less than 0.03mm and that the dimensions of the bottom surface of the lower seat and the assembly surface of the lower seat are the same. All holes on the bottom surface and the threaded holes are drilled, countersunk, and tapped. The turntable is then rotated 90° to machine the hole system on one side of the lower seat. The turntable is then rotated 180° to machine the hole system on the other side.

5. The machining process for a rapid bearing housing according to claim 1 or 4, characterized in that: In the second process, the end face, mounting hole, stop, and spherical surface of the upper seat are rough milled sequentially, and the hole system on the end face of the upper seat is drilled. The stop on one end of the upper seat is then semi-finish milled and finished milled sequentially. The turntable is rotated 180°, and the other end face, mounting hole, stop, and spherical surface of the upper seat are rough milled sequentially, and the hole system on the other end face of the upper seat is drilled. The lower seat is processed in the same way as the upper seat.

6. The machining process for a rapid bearing housing according to claim 5, characterized in that: In process two, the rough machining of the end faces and stops of the upper and lower seats is to control the finishing allowance of processes three and four. Most importantly, it is to prevent workpiece deformation and subsequent form and position errors such as flatness, position, and cylindricity. The rough machining of the workpiece is replaced by a milling cutter with a spherical design and R-foot on the lathe.

7. The machining process for a rapid bearing housing according to claim 6, characterized in that: In the third process, when semi-finish milling the upper assembly surface, leave a 0.05mm allowance, drill, countersink, and ream the first locating pin hole and assembly hole on the upper assembly surface, and finish mill the upper assembly surface to ensure that the flatness of the assembly surface is less than 0.012mm; when semi-finish milling the lower assembly surface, leave a 0.05mm allowance, drill, countersink, and ream the second locating pin hole and assembly hole on the lower assembly surface, and finish mill the lower assembly surface to ensure that the flatness of the assembly surface is less than 0.012mm; using a single-edged insert to process the assembly surface can improve the flatness and roughness of the assembly surface by one level.

8. The machining process for a rapid bearing housing according to claim 7, characterized in that: The precision milling of the assembly surface in step three must be done after step two. After rough milling the spherical surface, the workpiece will deform. Once the workpiece deformation is stable, the assembly surface is precision milled to better control the flatness of the assembly surface.

9. The machining process for a rapid bearing housing according to claim 8, characterized in that: In step four, the mounting hole and lower seat stop at one end of the bearing housing are semi-finish milled, leaving a 0.2mm allowance. The holes on one end face of the bearing housing are drilled and tapped. The turntable is rotated 180° to semi-finish mill the mounting hole and lower seat stop at the other end of the bearing housing, leaving a allowance. The holes on the other end face of the bearing housing are drilled and tapped. The turntable is rotated 180° in the opposite direction to finish mill the lower seat stop and the bearing housing end face, ensuring a flatness of less than 0.025mm. The mounting hole is precision bored. The turntable is rotated 180° to finish mill the lower cover stop and mounting hole at the other end of the lower seat.

10. The machining process for a rapid bearing housing according to claim 9, characterized in that: In process four, the tooling fixtures of the horizontal machining center that simultaneously process the upper and lower seats ensure that, under the conditions of consistent processing temperature, humidity, cutting fluid, and processing accuracy on the same machine tool, the pin hole size and center distance of the workpieces in the same group processed together by assembling the upper and lower seats of the bearing housing are consistent. It is easy to ensure the assembly effect when assembling the upper and lower seats.

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