Split bearing seat machining process

Abstract

The application provides a split bearing seat machining process and relates to the technical field of bearing seat machining.The process comprises the following steps: first, processing the through hole of the base into a first positioning hole, the threaded hole into a second positioning hole, and finishing the bottom surface, the butt joint top surface and the pin hole; second, processing the through hole of the cover plate into a third positioning hole, and finishing the butt joint bottom surface and the pin hole; third, installing multiple bases on the process plate with the first positioning hole as the reference, overlapping the cover plate between adjacent bases, and positioning the third positioning hole and the second positioning hole; wherein the semicircular holes of the cover plate and the base are located at the top and are horizontally staggered; fourth, rough machining the semicircular holes of the cover plate and the base simultaneously; fifth, combining the base and the cover plate after rough machining, and transferring to the lathe for finishing the inner hole; and finally, processing the through hole and the threaded hole on the base and the cover plate in place.The application realizes the unification of the rough machining and finishing reference of multiple pieces through the positioning hole, solves the problem of low single piece machining efficiency, and significantly improves the machining efficiency and precision.

Description

Technical Field

[0001] This invention belongs to the field of bearing housing processing technology, specifically relating to a processing technology for a split bearing housing. Background Technology

[0002] Split-type bearing housings are primarily used in scenarios where direct operation is difficult, such as with long shafts or in confined spaces. Their design aims to solve the problems of difficult installation and maintenance. The bearing housing mainly consists of a top cover and a base, each with a semi-circular groove on opposite sides. When closed, they form a complete circular hole for bearing installation. Currently, the top cover and base are typically cast and then machined to their final dimensions. The conventional process involves rough machining each component separately using a CNC machine tool, followed by precision machining of the inner hole on a lathe or precision boring using a CNC machine tool after assembling the two components.

[0003] However, existing machining methods, especially in the rough machining stage of the inner hole, adopt a single-piece machining mode, which requires separate material loading and alignment, making the process cumbersome and inefficient. Furthermore, in the subsequent lathe finishing process, the datum formed by rough machining is difficult to effectively align with the axis of the inner hole after mold closing, resulting in the datum not being accurately continued and utilized, which affects the machining accuracy and consistency. Summary of the Invention

[0004] This invention provides a machining process for a split bearing housing, which aims to solve the problems of low machining efficiency and inaccurate reference transfer in the prior art, which makes it difficult to guarantee the machining accuracy of the inner hole after assembly.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a processing technology for a split bearing housing, comprising the following steps: Step 1: Machine the first positioning hole at the position of the two through holes on each base, machine the second positioning hole at the position of the two threaded holes on the base, and finish machine the mating top surface on the base; machine the third positioning hole at the position of the two through holes on each cover plate, and finish machine the mating bottom surface on the cover plate. Step 2: Multiple bases are simultaneously positioned and installed on the process plate with their respective first positioning holes as references, and the multiple bases are spaced apart along a preset direction; a cover plate is placed above each pair of adjacent bases, with the semi-circular openings of the cover plate and the semi-circular openings of the bases both facing upwards; the cover plate is positioned by its two third positioning holes respectively being positioned with one of the second positioning holes of the two corresponding bases. Step 3: Simultaneously rough-machine the semi-circular holes on the cover plate and the base. Step 4: Remove the base and the cover plate from the process plate, and fasten the bottom mating surface of the cover plate to the top mating surface of the base one by one to form a bearing seat; at the same time, the semi-circular hole on the cover plate and the semi-circular hole on the base form the inner hole of the bearing seat, and transfer the bearing seat to the lathe for precision machining of the inner hole of the bearing seat. Step 5: After the finishing process is completed, machine the through holes and threaded holes on the base and the through holes on the cover plate.

[0006] In one possible implementation, step 1 further includes: A process threaded hole is machined at the bottom of the second positioning hole on the base. In step 2, the third positioning hole is aligned with the second positioning hole. A process bolt is passed through the third positioning hole and the second positioning hole in sequence and threadedly connected to the process threaded hole.

[0007] In one possible implementation, step 1 further includes: when the base is machining the first positioning hole and the second positioning hole, the pin hole on the mating top surface is also machined at the same time; when the cover plate is machining the third positioning hole, the pin hole on the mating bottom surface is also machined at the same time. Step 3 also includes: Remove the cover plate that has been rough-machined with the semi-circular hole, and place another cover plate above the two adjacent bases. Position the cover plate by using the two third positioning holes of the cover plate to one of the second positioning holes of the two corresponding bases. After verifying the position of the cover plate by checking the coordinates of the pin holes on the cover plate, process the new cover plate.

[0008] In one possible implementation, the process board includes: A base plate is provided with a first keyway arranged along a fourth direction in the length direction; and a second keyway arranged along a third direction in the length direction; A first positioning key is slidably disposed inside the first keyway, and a first bolt is threadedly connected to the first positioning key, with the middle part of the first bolt slidingly engaging with the first positioning hole. The second positioning key is slidably disposed inside the second keyway, and a second bolt is threadedly connected to the second positioning key, with the middle part of the second bolt slidingly engaging with the first positioning hole; A T-shaped pad is installed on top of the first positioning key and is snapped into the intersection of the first keyway and the second keyway. The T-shaped pad is provided with a guide hole that slides with the first bolt.

[0009] In one possible implementation, bolt platforms are provided on both sides of the cover plate, and the third positioning hole is located on the bolt platform. Step 1 further includes: Using the rough surface of the bottom surface of the cover plate as a reference, the top surface of the bolt platform is precision machined; Flip the cover plate so that the top surface of the bolt platform faces downwards for clamping, and then finish machine the mating bottom surface of the cover plate, the pin hole, and the third positioning hole; In step 2, the top surface of the bolt platform faces downward and abuts against the mating top surface of the base.

[0010] In one possible implementation, in step 4, when assembling the base and the cover plate, a pin is installed between the pin holes on the base and the pin holes on the cover plate to position the relative positions of the base and the cover plate.

[0011] In one possible implementation, in step 4, the spacing direction of the two first positioning holes is set as the machining reference of the bearing seat along the first direction, and the axial direction of the first positioning holes is set as the machining reference of the bearing seat along the second direction; wherein, the first direction and the second direction are perpendicular to each other.

[0012] In one possible implementation, in step 4, a clamping fixture is used to fix the bearing housing onto the lathe, the clamping fixture comprising: A clamping plate is used to mount the machine onto a lathe, and a support platform is provided on the outer side of the clamping plate. There are two support blocks, both of which are mounted on the support platform, and the positions of the two support blocks on the support platform have a degree of freedom to be adjusted along a first direction. A positioning pin is detachably mounted on the support block, and the positioning pin slides in conjunction with the first positioning hole. A clamping mechanism, installed on the clamping plate, is used to press the bearing housing as a whole onto the two support blocks.

[0013] In one possible implementation, the clamping mechanism includes: The pressure plate is slidably disposed on the clamping plate along the second direction and is arranged parallel to the support platform at a distance. An elastic element is installed between the pressure plate and the clamping plate to push the pressure plate to move away from the support platform; A pressure rod is hinged in the middle to the clamping plate. One end of the pressure rod is used to press the pressure plate, and the other end of the pressure rod is hinged to a connecting rod, which is used to connect to the drive end of the lathe hydraulic cylinder.

[0014] In one possible implementation, the distance between the axes of the two first positioning holes and the axis of the inner hole of the bearing seat along the first direction is equal. The projection line of the axis of the clamping plate on the support platform is defined as the reference line. The distance between the axes of the two positioning pins and the reference line along the first direction is equal. The two support blocks are equidistantly translated on the support platform relative to the reference line.

[0015] The solution shown in this application, compared with the prior art, involves pre-processing the base and cover plate of the split bearing housing. Specifically, the through holes on the base are machined to form the first positioning hole, and the threaded holes on the base are machined to form the second positioning hole. The bottom surface, the mating surface of the top, and the pin hole of the base are then precision machined to ensure that the base's reference surface meets the positioning accuracy requirements. Correspondingly, the through holes on the cover plate are machined to form the third positioning hole, and the mating surface of the bottom of the cover plate and the pin hole are then precision machined. This pre-processing lays a unified reference foundation for subsequent batch positioning and rough machining.

[0016] After pretreatment, the rough machining stage involves clamping and processing. Multiple bases are positioned and mounted on the process plate using the first positioning hole as a reference, achieving precise positioning and fixation of the bases on the process plate. Subsequently, a cover plate is overlapped between two adjacent bases, ensuring the third positioning hole on the cover plate coincides with the second positioning hole on the corresponding base, and connected with a pin to precisely position the cover plate. It is important to note that in this clamping state, the semi-circular holes on both the cover plate and the base are located at the top of their respective components, and they are horizontally staggered; that is, the semi-circular holes are not directly opposite each other, but rather arranged in an alternating manner. Under these clamping and positioning conditions, rough machining is simultaneously performed on the semi-circular holes on both the cover plate and the base. Because multiple bases are fixed to the same process plate and the cover plate is precisely aligned with the base through the positioning holes, this process enables batch rough machining of multiple bearing housing parts, significantly improving efficiency.

[0017] After rough machining, the corresponding base and cover plate are assembled into a complete bearing housing, which is then transferred to a lathe for finish machining of its inner hole. Since a unified datum was established using the first, second, and third positioning holes before rough machining, and this datum was maintained during the rough machining process, the semi-circular hole formed during rough machining can be effectively aligned with the axis of the inner hole after mold assembly during finish machining on the lathe, ensuring the accurate continuation of the datum. After all finish machining is completed, the through holes and threaded holes on the base are machined to their final dimensions, and the through holes on the cover plate are machined into place. This avoids damaging the established positioning features during finish machining, ultimately resulting in a high-precision, highly consistent split-type bearing housing. Attached Figure Description

[0018] Figure 1This is an exploded structural diagram of the base and cover plate provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the base and cover plate installed on the process plate according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the connection structure between the base and the cover plate on the process plate provided in an embodiment of the present invention; Figure 4 A side sectional view of the base plate provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the clamping fixture provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the installation structure of the pressure bar provided in an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1. Base; 11. First positioning hole; 12. Second positioning hole; 13. Pin hole; 2. Cover plate; 21. Third positioning hole; 3. Process plate; 31. Base plate; 32. First positioning key; 33. First bolt; 34. Second positioning key; 35. Second bolt; 36. T-shaped pad; 37. Process bolt; 4. Clamping fixture; 41. Clamping plate; 42. Support platform; 43. Support block; 44. Positioning pin; 45. Clamping mechanism; 451. Pressure plate; 452. Elastic element; 453. Pressure rod; 454. Connecting rod. Detailed Implementation

[0020] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0021] Please refer to the following: Figures 1 to 6 The processing technology for the split bearing housing provided by this invention will now be described. The processing technology for the split bearing housing includes the following steps: Step 1: Machining the through hole on the base 1 as the first positioning hole 11, machining the threaded hole on the base 1 as the second positioning hole 12, and finishing machining the bottom and top mating surfaces and pin holes 13 of the base 1; machining the through hole on the cover plate 2 as the third positioning hole 21, and finishing machining the bottom mating surface and pin holes 13 of the cover plate 2. Step 2: Multiple bases 1 are positioned and installed on the process plate 3 with the first positioning hole 11 as the reference. The cover plate 2 overlaps between two adjacent bases 1, and the position of the cover plate 2 is positioned by aligning the third positioning hole 21 on the cover plate 2 with the second positioning hole 12 on the corresponding base 1. Among them, the semi-circular holes on the cover plate 2 and the semi-circular holes on the base 1 are both located at the top and are staggered relative to each other in the horizontal direction; Step 3: Simultaneously rough-machine the semi-circular holes on the cover plate 2 and the base 1. Step 4: Assemble base 1 and cover plate 2, and transfer them to the lathe for precision machining of the inner hole of the bearing housing; Step 5: After the finishing process is completed, machine the through holes and threaded holes on the base 1 and machine the through holes on the cover plate 2.

[0022] Compared with existing technologies, the machining process for the split bearing housing provided in this embodiment first involves pre-processing the base 1 and the cover plate 2. Specifically, the through holes on the base 1 are machined to form the first positioning hole 11, and the threaded holes on the base 1 are machined to form the second positioning hole 12. The bottom surface, the mating top surface, and the pin hole 13 of the base 1 are then precision machined to ensure that the reference surface of the base 1 meets the positioning accuracy requirements. Correspondingly, the through holes on the cover plate 2 are machined to form the third positioning hole 21, and the mating bottom surface and the pin hole 13 of the cover plate 2 are then precision machined. This pre-processing lays a unified reference foundation for subsequent batch positioning and rough machining.

[0023] After pretreatment, the rough machining stage begins with clamping and processing. Multiple bases 1 are positioned and mounted on the process plate 3 using the first positioning hole 11 as a reference, achieving precise positioning and fixation of the bases 1 on the process plate 3. Subsequently, a cover plate 2 is overlapped between two adjacent bases 1, with the third positioning hole 21 on the cover plate 2 coinciding with the second positioning hole 12 on the corresponding base 1, and connected using pins to precisely position the cover plate 2. It should be noted that in this clamping state, the semicircular holes on the cover plate 2 and the base 1 are both located at the top of their respective components, and they are horizontally staggered; that is, the semicircular holes are not directly opposite each other, but rather arranged in an alternating manner. Under these clamping and positioning conditions, rough machining is simultaneously performed on the semicircular holes on both the cover plate 2 and the base 1. Since multiple bases 1 are fixed on the same process plate 3 and the cover plate 2 is precisely aligned with the base 1 through the positioning holes, this process enables multiple bearing seat parts to be rough-machined in batches by simply aligning the machining coordinates of the process plate 3 once, which significantly improves efficiency.

[0024] After rough machining, the corresponding base 1 and cover plate 2 are combined to form a complete bearing housing, which is then transferred to a lathe for finish machining of its inner hole. Since a unified datum was established before rough machining using the first positioning hole 11, the second positioning hole 12, and the third positioning hole 21, and this datum was maintained during rough machining, the semi-circular hole formed during rough machining can be effectively aligned with the axis of the inner hole after mold closing, ensuring the accurate continuation of the datum. After all finish machining is completed, the through holes and threaded holes on the base 1 are machined to their final dimensions, and the through holes on the cover plate 2 are machined into place. This avoids damage to the established positioning features during finish machining, ultimately resulting in a high-precision, highly consistent split-type bearing housing.

[0025] Specifically, in this embodiment, the inner diameter of the first positioning hole 11 is not greater than the size of the through hole after the finished product, the inner diameter of the second positioning hole 12 is not greater than the size of the threaded hole after the finished product, and the inner diameter of the third positioning hole 21 is not greater than the size of the through hole after the finished product.

[0026] Specifically, in this embodiment, in step 5, a drilling machine can be used directly to complete the hole enlargement operation.

[0027] In some embodiments, see Figure 2 , Figure 3 Step 1 further includes: A process threaded hole is machined at the bottom of the second positioning hole 12 on the base 1. In step 2, the third positioning hole 21 is aligned with the second positioning hole 12. A process bolt 37 is passed through the third positioning hole 21 and the second positioning hole 12 in sequence and is threadedly connected to the process threaded hole.

[0028] Specifically, in this embodiment, the size of the process threaded hole is smaller than the size of the threaded hole designed on the base 1.

[0029] In the preprocessing step 1, in addition to machining the first positioning hole 11 and the second positioning hole 12 and finishing the relevant mating surfaces, a process threaded hole is further machined at the bottom of the second positioning hole 12 on the base 1. The axis of the bottom hole of the process threaded hole is coaxial with the second positioning hole 12, and this process threaded hole is used for threaded connection when temporarily fixing the cover plate 2 later. Accordingly, in the positioning and installation process of step 2, the cover plate 2 is fixedly installed onto the base 1 using process bolts 37. The process bolts 37 are designed to have two functional parts: one part is a guide part, and the other part is a threaded part. The guide portion forms a sliding fit with the second positioning hole 12 and the third positioning hole 21. That is, when the cover plate 2 overlaps with the adjacent base 1 and the third positioning hole 21 coincides with the second positioning hole 12, the guide portion of the process bolt 37 can smoothly pass through the third positioning hole 21 of the cover plate 2 and enter the second positioning hole 12 of the base 1, serving as a centering guide. The threaded portion forms a threaded fit with the process threaded hole on the base 1, and by tightening the process bolt 37, the cover plate 2 is pressed and fixed onto the base 1. Through this structure, the process bolt 37 achieves rapid and accurate positioning between the cover plate 2 and the base 1, and also provides a reliable clamping force to resist cutting forces during rough machining. Simultaneously, since the guide portion and the positioning hole are in a sliding fit rather than a threaded connection, damage to the positioning hole threads is avoided due to repeated disassembly and assembly, ensuring the stability of the positioning reference. After completing subsequent rough and finish machining, the process bolt 37 can be removed, and the through holes and threaded holes on the base 1 and the through holes on the cover plate 2 can be machined to their final dimensions.

[0030] Specifically, in this embodiment, the tolerance between the second positioning hole 12 and the third positioning hole 21 is +0.02mm to +0.04mm, while the tolerance of the guide portion on the process bolt 37 is -0.02mm to 0mm, ensuring that the guide portion on the process bolt 37 can be slidably disposed inside the second positioning hole 12 and the third positioning hole 21. The design using the process bolt 37 allows the cover plate 2 to be fixed to the base 1, simultaneously achieving the positioning of the relative positions between the base 1 and the cover plate 2, reducing the need for subsequent pressure plates 451 and fasteners, and making it more convenient for operators to load and unload materials.

[0031] In some embodiments, see Figure 2 , Figure 3 Step 1 further includes: when the base 1 is machining the first positioning hole 11 and the second positioning hole 12, the pin hole 13 on the mating top surface is also machined at the same time; when the cover plate 2 is machining the third positioning hole 21, the pin hole 13 on the mating bottom surface is also machined at the same time. Step 3 also includes: Remove the cover plate 2 that has been rough-machined with semi-circular holes, and place another cover plate 2 above the two adjacent bases 1. Position the cover plate 2 by connecting the two third positioning holes 21 of the cover plate 2 with one of the second positioning holes 12 of the two corresponding bases 1. After verifying the position of the cover plate 2 by checking the coordinates of the pin holes 13 on the cover plate 2, process the new cover plate 2.

[0032] After rough machining the semi-circular holes on the cover plate 2 and base 1 in step 3, the cover plate 2 is replaced and supplemented. Specifically, multiple bases 1 are arranged sequentially along a third direction, and the length direction of the bases 1 is also set along the third direction, forming a neat array layout. In this layout, each cover plate 2 overlaps between two adjacent bases 1, that is, the cover plate 2 spans and connects two adjacent bases 1, forming an alternating combination structure of "base 1-cover plate 2-base 1-cover plate 2-base 1". Since the cover plate 2 needs to rely on the bases 1 on both sides for support and positioning, in the case of a single-row arrangement, the two bases 1 at the first and last ends each lack an adjacent base 1 to overlap the cover plate 2, resulting in the number of cover plates 2 in the entire row being one less than the number of bases 1. After completing the rough machining in step 3, the machined cover plate 2 is removed from the base 1, at which point the position between the two adjacent bases 1 originally covered by the cover plate 2 is vacated. Then, a new cover plate 2 is installed between these two bases 1, and the above positioning and clamping operations are repeated. In this embodiment, after all the bases 1 of the same specification and batch are processed, there will be multiple cover plates 2 remaining. At this time, the above method can be used to process the excess cover plates 2 without the need for additional tooling to process the cover plates 2 separately, which effectively reduces tooling costs and process complexity.

[0033] Meanwhile, since the cover plate 2 is repeatedly disassembled and installed during the processing, it is necessary to check the position of the newly installed cover plate 2. At this time, the coordinates of the pin hole 13 machined on the cover plate 2 in step 1 can be used to check the installation position of the cover plate 2. When the coordinate position is within the preset error range, the subsequent roughing of the semi-circular hole on the cover plate 2 is then carried out. In this way, subsequent roughing deviations caused by clamping errors are effectively avoided, ensuring the machining accuracy and consistency of the semi-circular hole on the cover plate 2.

[0034] Specifically, in this embodiment, by simultaneously installing the base 1 and the cover plate 2 on the process plate 3 for synchronous processing, the subsequent assembly process and the CNC machining process can be carried out synchronously. At the same time, by stacking the cover plate 2 on the base 1, the space on the process plate 3 can be better utilized, enabling the synchronous clamping of multiple workpieces and improving production efficiency.

[0035] In some embodiments, the process plate 3 described above can be adopted as follows: Figure 2 , Figure 3 and Figure 4 The structure shown. See also... Figure 2 , Figure 3 and Figure 4 The process plate 3 includes a base plate 31, a first positioning key 32, a second positioning key 34, and a T-shaped pad 36. The base plate 31 has a first keyway extending along a fourth direction and a second keyway extending along a third direction. The first positioning key 32 is slidably disposed inside the first keyway, and a first bolt 33 is threadedly connected to the first positioning key 32, with the middle portion of the first bolt 33 slidingly engaging with a first positioning hole 11. The second positioning key 34 is slidably disposed inside the second keyway, and a second bolt 35 is threadedly connected to the second positioning key 34, with the middle portion of the second bolt 35 slidingly engaging with the first positioning hole 11. The T-shaped pad 36 is installed on top of the first positioning key 32 and is engaged at the intersection of the first and second keyways. The T-shaped pad 36 has a guide hole that slides with the first bolt 33.

[0036] In this embodiment, the process plate 3 is specifically constructed as a combination structure including a base plate 31, a first positioning key 32, a second positioning key 34, and a T-shaped pad 36. The base plate 31 is provided with a first keyway extending along a fourth direction and a second keyway extending along a third direction. The third and fourth directions intersect each other and are typically set perpendicularly to form a grid-like positioning layout. The first positioning key 32 is slidably disposed inside the first keyway, meaning the first positioning key 32 can move and adjust its position along the length direction of the first keyway. A first bolt 33 is threadedly connected to the first positioning key 32, and the middle part of the first bolt 33 forms a sliding engagement with the first positioning hole 11 on the base 1, thereby achieving the positioning and initial fixation of the base 1 on the process plate 3. The second positioning key 34 is slidably disposed inside the second keyway, meaning the second positioning key 34 can move and adjust its position along the length direction of the second keyway. A second bolt 35 is threadedly connected to the second positioning key 34, and the middle part of the second bolt 35 also slides and engages with the first positioning hole 11.

[0037] T-shaped pads 36 are installed on top of the first positioning key 32 and are engaged at the intersection of the first keyway and the second keyway. That is, the T-shaped pads 36 are simultaneously embedded within the cross-shaped area formed by the first and second keyways, serving a dual function of limiting positioning and bearing load. Since the first positioning key 32 is slidably disposed within the first keyway, the T-shaped pads 36, combined with the first bolts 33, can fix the first positioning key 32 to the intersection of the first and second keyways. The appropriate position of the second keyway can be selected according to the dimensions of the base 1. With this structure, when the base 1 is installed on the base plate 31, a first positioning hole 11 on the end of the base 1 is positioned at the intersection of the first and second keyways by the first bolts 33. The subsequent bases 1 are arranged sequentially along the length of the second keyway, thus allowing for the unique positioning of multiple bases 1 on the base plate 31. During machining, the base plate 31 can be used to establish a machining coordinate system, simultaneously machining the semi-circular holes on multiple bases 1 and the cover plate 2. This clamping process can simultaneously locate the position of the base 1 on the base plate 31. During processing, a coordinate system can be established through the base plate 31. When processing the base 1 in subsequent batches, there is no need to repeatedly re-align and establish the processing coordinate system, which significantly improves the efficiency and consistency of batch processing.

[0038] Preferably, in this embodiment, a single first keyway is connected to multiple second keyways, enabling multiple rows of bases 1 to be simultaneously mounted on the base plate 31, and allowing multiple rows of bases 1 to be mounted on a single base plate 31 for simultaneous processing. It is also suitable for various bases 1 whose positions on the base plate 31 can be freely adjusted by selecting the appropriate second keyway according to requirements.

[0039] In some embodiments, bolt platforms are provided on both sides of the cover plate 2, and the third positioning hole 21 is located on the bolt platform. Step 1 further includes: Using the blank surface of the bottom surface of the cover plate 2 as a reference, the top surface of the bolt platform is precision machined; Flip the cover plate so that the top surface of the bolt platform faces down for clamping, and finish machine the mating bottom surface of the cover plate 2, the pin hole 13, and the third positioning hole 21; In step 2, the top surface of the bolt platform faces downward and abuts against the mating top surface of the base 1.

[0040] In this embodiment, the following pre-processing steps are used when machining the cover plate 2. First, as in step 1, the top surface of the bolt platform on the cover plate 2 is precision machined using the rough surface of the bottom mating surface as a reference. This bolt platform is a boss structure on the cover plate 2 used to accommodate connecting bolts, and its top surface, after precision machining, serves as an important positioning reference for subsequent clamping. After completing the top surface precision machining, step 2 is performed, where the cover plate 2 is clamped with the top surface of the bolt platform facing down, that is, the precision-machined top surface of the bolt platform serves as a support surface in contact with the worktable or fixture. In this clamping state, the mating bottom surface of the cover plate 2, the pin hole 13, and the third positioning hole 21 are precision machined. This ensures that the third positioning hole 21 and the corresponding pin hole 13 are machined in the same state, thereby guaranteeing the accuracy of their relative positions.

[0041] Specifically, in this embodiment, the top surface of the bolt platform on the cover plate 2 serves as the machining reference for the mating bottom surface on the cover plate 2, and also as the clamping reference for clamping with the base 1 in step 2.

[0042] Since the top surface of cover plate 2 is mostly arc-shaped, it is not convenient for support and clamping. By adopting the above processing method, on the one hand, the reference for machining the bottom surface of cover plate 2 is prefabricated using the bolt platform, realizing the transfer and unification of the reference, which facilitates clamping and effectively ensures the stability of clamping during processing; on the other hand, the top surface of the bolt platform is machined with the blank surface of the bottom surface of cover plate 2 as the reference. During alignment, the support height of each support point is adjusted to keep the machining amount of each part of the blank surface of the bottom surface of cover plate 2 uniform. This ensures that sufficient machining allowance can be left in each part when machining the bottom surface of cover plate 2 later, effectively avoiding local under-machining or over-machining caused by blank deviation, and improving the yield and dimensional consistency of cover plate 2.

[0043] Preferably, in this embodiment, during the machining of the base 1 in step 1, the bottom surface of the base 1 is machined first using the rough top surface of the base 1 as a reference, i.e., the bottom surface of the base 1 is machined with the bottom surface facing upwards. Then, the rough top surface of the base 1, the pin hole 13, the first positioning hole 11, and the second positioning hole 12 are machined using the finished bottom surface as a reference. This ensures that the pin hole 13, the first positioning hole 11, and the second positioning hole 12 are machined synchronously under the same clamping condition, guaranteeing the accuracy of their relative positions.

[0044] In some embodiments, in step 4, when assembling the base 1 and the cover plate 2, a pin is installed between the pin hole 13 on the base 1 and the pin hole 13 on the cover plate 2 to position the relative position between the base 1 and the cover plate 2. In this embodiment, after the rough machining of the semi-circular holes of the base 1 and the cover plate 2 is completed, the two need to be assembled for subsequent internal hole finishing. During assembly, a pin is installed between the pin hole 13 on the base 1 and the pin hole 13 on the cover plate 2. The precise positioning of the relative position between the base 1 and the cover plate 2 is achieved through the precise fit between the pin and the pin hole 13. It should be noted that the pin hole 13 is the positioning reference when the finished base 1 and the cover plate 2 are combined together. That is, when finally assembled into a complete bearing housing product, the relative positional relationship between the base 1 and the cover plate 2 is determined by this pair of pin holes 13 and pins. Therefore, pre-installing pins for positioning before finishing the inner hole ensures that the relative position of the base 1 and the cover plate 2 during the finishing process remains consistent with the final assembled state, thereby guaranteeing a precise positional relationship between the axis of the finished inner hole and the mating surface of the base 1 and the cover plate 2. By introducing the positioning reference of the finished product into the finishing process in advance, deviations in the inner hole position caused by assembly and clamping errors are avoided, effectively ensuring the assembly accuracy and performance of the finished bearing housing.

[0045] In some embodiments, see Figure 5 , Figure 6 In step 4, the spacing direction of the two first positioning holes 11 is set as the machining reference of the bearing seat along the first direction, and the axial direction of the first positioning holes 11 is set as the machining reference of the bearing seat along the second direction; wherein, the first direction and the second direction are perpendicular to each other.

[0046] In this embodiment, when transferring the assembled bearing housing to the lathe for finishing the inner hole in step 4, a unified machining datum needs to be established. Specifically, the spacing direction of the two first positioning holes 11 on the base 1 is set as the machining datum of the bearing housing along the first direction, and the axial direction of the first positioning holes 11 is set as the machining datum of the bearing housing along the second direction. The first and second directions are perpendicular to each other, and both are perpendicular to the axis of the lathe spindle. Through the above datum setting, the clamping posture of the bearing housing on the lathe is clearly defined: the straight line direction determined by the two first positioning holes 11 is perpendicular to the axis of the lathe spindle, and the axial direction of the first positioning holes 11 is also perpendicular to the spindle axis, that is, the axial direction of the inner hole of the bearing housing is parallel to the spindle axis. This datum selection method allows the axis of the inner hole to form a precise spatial geometric relationship with the positioning datum and bottom surface datum on the base 1 during the finishing process. Since the first positioning hole 11 has been precision machined in the previous process and has high dimensional and positional accuracy, using it as the positioning datum for precision machining can effectively reduce the accumulation of errors caused by datum conversion, and ensure that the inner hole after precision machining has accurate position relative to the bearing housing as a whole, thereby improving the assembly interchangeability and reliability of the finished bearing housing.

[0047] Preferably, in this embodiment, when processing the two first positioning holes 11 on the base 1 in step 1, the arrangement direction of the two first positioning holes 11 is set along the axis perpendicular to the inner hole. At the same time, the bottom surface of the base 1 is processed so that the axial direction of the first positioning holes 11 is perpendicular to the bottom surface.

[0048] In some embodiments, the clamping fixture 4 described above can be as follows: Figure 5 , Figure 6 The structure shown. See also... Figure 5 , Figure 6 In step 4, the bearing housing is fixed to the lathe using a clamping fixture 4. The clamping fixture 4 includes a clamping plate 41, support blocks 43, locating pins 44, and a clamping mechanism 45. The clamping plate 41 is used to install onto the lathe, and a support platform 42 protrudes from the outer side of the clamping plate 41. There are two support blocks 43, both of which are mounted on the support platform 42, and the positions of the two support blocks 43 on the support platform 42 have a degree of freedom for adjustment along a first direction. The locating pins 44 are detachably mounted on the support blocks 43, and the locating pins 44 slide in engagement with the first locating hole 11. The clamping mechanism 45 is mounted on the clamping plate 41 and is used to press the bearing housing as a whole onto the two support blocks 43.

[0049] The clamping fixture 4 includes a clamping plate 41, support blocks 43, locating pins 44, and a clamping mechanism 45. The clamping plate 41 is mounted on a lathe and fixed to it by a three-jaw chuck. A support platform 42 protrudes from the outer side of the clamping plate 41, providing a mounting base for the support blocks 43. There are two support blocks 43, both mounted on the support platform 42. The positions of the two support blocks 43 on the support platform 42 have a degree of freedom for adjustment along a first direction. This means that the relative positions of the two support blocks 43 can be flexibly adjusted according to the distance between the two first positioning holes 11 on different bearing seats to meet the processing requirements of products of different specifications. The locating pin 44 is detachably mounted on the support block 43 and fixed in a relative position to the support block 43. For example, a guide hole is designed on the support block 43, and a guide post is designed on the locating pin 44 to slide and engage with the guide hole, accommodating the clamping of bases 1 with first positioning holes 11 of different sizes. The locating pin 44 forms a sliding engagement with the first positioning hole 11 on the base 1. The clamping mechanism 45 is mounted on the clamping plate 41 and is used to press the bearing housing as a whole onto the two support blocks 43. Specifically, in this embodiment, the position of the bearing housing along the first direction is limited by the position of the two support blocks 43, that is, the two support blocks 43 jointly determine the positioning reference surface of the bearing housing in the first direction; while the position adjustment along the second direction is achieved by adding shims of different thicknesses above the support blocks 43. By selecting the thickness of the shims, the position of the inner hole on the bearing housing along the second direction can be adjusted, so that the axis of the inner hole is precisely aligned with the axis of the lathe spindle.

[0050] In practice, firstly, based on the distance between the two first positioning holes 11 on the bearing housing to be processed, the positions of the two support blocks 43 on the support table 42 are adjusted along the first direction so that the distance between the two positioning pins 44 fixedly installed on the support blocks 43 matches the distance between the two first positioning holes 11. Simultaneously, the thickness of the shims on the two support blocks 43 restricts the positioning of the bearing housing in the second direction. Based on the design position of the inner hole, shims of appropriate thickness are added above the support blocks 43 to adjust the position of the bearing housing along the second direction, ensuring that the inner hole axis coincides with the spindle axis. Then, the assembled bearing housing is placed on the clamping fixture 4, so that the two positioning pins 44 are respectively inserted into the two first positioning holes 11 on the base 1, achieving precise positioning of the bearing housing on the clamping plate 41. Finally, the clamping mechanism 45 presses the bearing housing as a whole onto the two support blocks 43 and the shims, ensuring that the bearing housing maintains a stable clamping state during the rotation of the lathe spindle and finishing process. By using the above-described clamping fixture 4 and implementation method, the two first positioning holes 11 on the base 1 are used as positioning references. With the two support blocks 43 restricting the position in the first direction and adjusting the position in the second direction by the thickness of the shim above the support blocks 43, the fast and accurate clamping of bearing seats of different specifications and the precise alignment of the inner hole axis with the spindle axis are realized. This effectively shortens the auxiliary time of the finishing process and ensures the accuracy and consistency of the inner hole machining.

[0051] Specifically, in this embodiment, the aforementioned clamping fixture 4 is used on a lathe for finishing the inner hole of the bearing housing. After the first bearing housing is aligned, subsequent bearing housings can be directly positioned using the first positioning hole 11. Simultaneously, the clamping mechanism 45 provides sufficient clamping force for rapid positioning of the bearing housings, improving production efficiency in mass production. Furthermore, the first positioning hole 11 is used for positioning during both roughing on the CNC milling machine and finishing on the lathe, eliminating the need for additional positioning and machining references and simplifying the machining process.

[0052] In some embodiments, the aforementioned clamping mechanism 45 may employ, for example... Figure 5 , Figure 6 The structure shown. See also... Figure 5 , Figure 6 The clamping mechanism 45 includes a pressure plate 451, an elastic element 452, and a pressure rod 453. The pressure plate 451 is slidably disposed on the clamping plate 41 along the second direction and is arranged parallel to the support table 42 at a distance. The elastic element 452 is installed between the pressure plate 451 and the clamping plate 41 and is used to push the pressure plate 451 to move away from the support table 42. The pressure rod 453 is hinged to the clamping plate 41 in the middle. One end of the pressure rod 453 is used to press the pressure plate 451, and the other end of the pressure rod 453 is hinged to a connecting rod 454, which is used to connect to the drive end of the lathe hydraulic cylinder.

[0053] The clamping mechanism 45 includes a pressure plate 451, an elastic element 452, and a pressure rod 453. The pressure plate 451 is slidably disposed on the clamping plate 41 along a second direction and is spaced parallel to the support table 42, forming a clamping space between the pressure plate 451 and the support table 42 to accommodate the bearing seat. The elastic element 452 is installed between the pressure plate 451 and the clamping plate 41 and is used to push the pressure plate 451 to move away from the support table 42, thereby keeping the pressure plate 451 in a loose position when not clamped, facilitating the removal and placement of the bearing seat. The middle part of the pressure rod 453 is hinged to the clamping plate 41. One end of the pressure rod 453 is used to press the pressure plate 451, and the other end of the pressure rod 453 is hinged to a connecting rod 454, which is used to connect to the drive end of the lathe hydraulic cylinder and is hinged to the drive end of the hydraulic cylinder. In practical implementation, when the lathe hydraulic cylinder actuates, the driving end of the hydraulic cylinder drives the connecting rod 454 to move. The connecting rod 454 drives the pressure rod 453 to rotate around its central hinge point. One end of the pressure rod 453 presses against the pressure plate 451, causing the pressure plate 451 to overcome the elastic force of the elastic element 452 and move towards the support table 42, thereby pressing the bearing seat placed on the support table 42. When the hydraulic cylinder reverses its action, the pressing force of the pressure rod 453 on the pressure plate 451 is released, and the elastic element 452 pushes the pressure plate 451 back to its original position away from the support table 42, releasing the bearing seat. Through the above-mentioned clamping mechanism 45, using the lathe's own hydraulic cylinder as a power source, the automatic clamping and loosening of the bearing seat on the clamping fixture 4 is realized, eliminating the need for manual locking and improving clamping efficiency and clamping force stability.

[0054] Specifically, the hydraulic cylinders on the lathe are hydraulic cylinders used to drive the hydraulic chuck. This allows the existing control program of the machine tool to control the clamping and disassembly of the bearing housing, eliminating the need for additional cylinders and control modules.

[0055] Preferably, in this embodiment, two guide posts are fixedly installed on the pressure plate 451, and two guide seats that slide in cooperation with the two guide posts are fixedly installed on the clamping plate 41. The elastic element 452 is a spring, with one end of the spring abutting against the guide seat and the other end abutting against the pressure plate 451. The design of the two guide posts guides the movement direction of the pressure plate 451.

[0056] In some embodiments, see also Figure 1 , Figure 5 The distance between the axes of the two first positioning holes 11 and the axis of the inner hole of the bearing seat along the first direction is equal. The projection line of the axis of the clamping plate 41 on the support platform 42 is defined as the reference line. The distance between the axes of the two positioning pins 44 and the reference line along the first direction is equal. The two support blocks 43 are equidistantly translated on the support platform 42 relative to the reference line.

[0057] During the preprocessing in step 1, two first positioning holes 11 are machined on the base 1, and the distance between the axes of the two first positioning holes 11 and the axis of the inner hole of the bearing seat along the first direction is equal. That is, the two first positioning holes 11 are symmetrically arranged with respect to the axis of the inner hole of the bearing seat, and their radial distances are the same. This design ensures that the position of the inner hole axis can be accurately determined with the two first positioning holes 11 as a reference during subsequent finishing. Correspondingly, on the clamping fixture 4, the projection line of the axis of the clamping plate 41 on the support table 42 is defined as the reference line, and the distance between the axes of the positioning pins 44 on the two support blocks 43 and the reference line is equal, and the two support blocks 43 are equidistantly translated on the support table 42 with respect to the reference line. That is, the arrangement of the two support blocks 43 on the support table 42 is consistent with the arrangement of the two first positioning holes 11 on the base 1, both being equidistantly distributed with the reference line as the center of symmetry. With the above structure, when the bearing housing is installed onto the two locating pins 44 through the two first locating holes 11, the axis of the inner hole of the bearing housing naturally coincides with the axis of the clamping plate 41, without the need for additional alignment adjustment.

[0058] In practice, the symmetrical arrangement parameters of the two support blocks 43 on the support table 42 are first determined based on the distance between the two first positioning holes 11 on the bearing housing to be machined and the design position of the inner hole. The positions of the two support blocks 43 are adjusted along the first direction so that the axes of the two positioning pins 44 are equidistant from the reference line, and the two support blocks 43 are symmetrically distributed relative to the reference line. Then, the assembled bearing housing is placed on the clamping fixture 4, and the two positioning pins 44 are inserted into the two first positioning holes 11 on the base 1. Since the two first positioning holes 11 are symmetrical with respect to the inner hole axis, and the two positioning pins 44 are symmetrical with respect to the reference line, the axis of the bearing housing's inner hole automatically coincides with the axis of the clamping plate 41. Finally, the bearing housing is clamped and fixed by the clamping mechanism 45. Through the above-mentioned symmetrically arranged positioning structure, the bearing housing achieves self-centering clamping on the lathe, eliminating the need to adjust the coaxiality of the inner hole and the spindle each time, significantly improving the clamping efficiency and repeatability of the finishing process, while ensuring the roundness and positional accuracy requirements of the machined inner hole.

[0059] Preferably, in this embodiment, two support blocks 43 are slidably disposed on the support platform 42 along a first direction. A lead screw is rotatably disposed on the support platform 42, and the lead screw is threadedly connected to the two support blocks 43. The thread pitch of the lead screw and the two support blocks 43 is the same, but the direction of rotation is opposite. Thus, the relative position of the two support blocks 43 on the support platform 42 can be adjusted by rotating the lead screw. After the position adjustment is completed, the self-locking characteristic of the lead screw's own thread can lock the position of the support blocks 43 without the need for an additional locking device. If further rigidity is required, locking screws can be added to the support blocks 43 to press against the support platform 42 for auxiliary locking.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A machining process for a split bearing housing, characterized in that, Includes the following steps: Step 1: Machine the first positioning hole (11) at the position of the two through holes on each base (1), machine the second positioning hole (12) at the position of the two threaded holes on the base (1), and finish machine the mating top surface on the base (1); machine the third positioning hole (21) at the position of the two through holes on each cover plate (2), and finish machine the mating bottom surface on the cover plate (2); Step 2: Multiple bases (1) are simultaneously positioned and installed on the process plate (3) with their respective first positioning holes (11) as references, and the multiple bases (1) are spaced apart along a preset direction; a cover plate (2) is arranged above each pair of adjacent bases (1), and the semi-circular openings of the cover plate (2) and the semi-circular openings of the bases (1) are both facing upwards; the cover plate (2) is positioned by the two third positioning holes (21) of the cover plate (2) and one of the second positioning holes (12) of the corresponding two bases (1); Step 3: Simultaneously rough-machine the semi-circular holes on the cover plate (2) and the base (1); Step 4: Remove the base (1) and the cover plate (2) from the process plate (3), and fasten the bottom surface of the cover plate (2) and the top surface of the base (1) one by one to form a bearing seat; at the same time, the semi-circular hole on the cover plate (2) and the semi-circular hole on the base (1) form the inner hole of the bearing seat, and transfer the bearing seat to the lathe to finish machining the inner hole of the bearing seat; Step 5: After the finishing process is completed, the through holes and threaded holes on the base (1) are machined to the correct position, and the through holes on the cover plate (2) are machined to the correct position.

2. The processing technology for the split bearing housing as described in claim 1, characterized in that, Step 1 also includes: A process thread hole is machined at the bottom of the second positioning hole (12) on the base (1). In step 2, the third positioning hole (21) is aligned with the second positioning hole (12) vertically. A process bolt is passed through the third positioning hole (21) and the second positioning hole (12) in sequence and is threadedly connected to the process thread hole.

3. The processing technology for the split bearing housing as described in claim 1, characterized in that, Step 1 further includes: when the base (1) is machining the first positioning hole (11) and the second positioning hole (12), the pin hole (13) on the top surface is also machined at the same time; when the cover plate (2) is machining the third positioning hole (21), the pin hole (13) on the bottom surface is also machined at the same time. Step 3 also includes: Remove the cover plate (2) that has been rough-machined with semi-circular holes, and place another cover plate (2) above the two adjacent bases (1). Position the cover plate (2) by using the two third positioning holes (21) of the cover plate (2) to one of the second positioning holes (12) of the corresponding two bases (1). After verifying the position of the cover plate (2) by checking the coordinates of the pin hole (13) on the cover plate (2), process the new cover plate (2).

4. The processing technology for the split bearing housing as described in claim 3, characterized in that, The process plate (3) includes: The base plate (31) is provided with a first keyway arranged along the fourth direction in the length direction; and a second keyway arranged along the third direction in the length direction; The first positioning key (32) is slidably disposed inside the first keyway. The first positioning key (32) is threadedly connected to the first bolt (33), and the middle part of the first bolt (33) is slidably engaged with the first positioning hole (11). The second positioning key (34) is slidably disposed inside the second keyway. The second positioning key (34) is threadedly connected to the second bolt (35), and the middle part of the second bolt (35) is slidably engaged with the first positioning hole (11). A T-shaped pad (36) is installed on the top of the first positioning key (32) and is snapped into the intersection of the first keyway and the second keyway. The T-shaped pad (36) is provided with a guide hole that slides with the first bolt (33).

5. The processing technology for the split bearing housing as described in claim 1, characterized in that, The cover plate (2) has bolt platforms on both sides, and the third positioning hole (21) is located on the bolt platform. Step 1 further includes: Using the blank surface of the bottom surface of the cover plate (2) as a reference, the top surface of the bolt platform is precision machined; Flip the cover plate (2) so that the top surface of the bolt platform faces down for clamping, and finish machine the mating bottom surface of the cover plate (2), the pin hole (13) and the third positioning hole (21); In step 2, the top surface of the bolt platform faces downward and abuts against the mating top surface of the base (1).

6. The processing technology for the split bearing housing as described in claim 1, characterized in that, In step 4, when assembling the base (1) and the cover plate (2), a pin is installed between the pin hole (13) on the base (1) and the pin hole (13) on the cover plate (2) to position the relative position between the base (1) and the cover plate (2).

7. The machining process for the split bearing housing as described in claim 1, characterized in that, In step 4, the spacing direction of the two first positioning holes (11) is set as the machining reference of the bearing seat along the first direction, and the axial direction of the first positioning hole (11) is set as the machining reference of the bearing seat along the second direction; wherein, the first direction and the second direction are perpendicular to each other.

8. The machining process for the split bearing housing as described in claim 7, characterized in that, In step 4, the bearing housing is fixed to the lathe using a clamping fixture (4), which includes: A clamping plate (41) is used to be mounted on a lathe, and a support platform (42) is provided on the outer side of the clamping plate (41); There are two support blocks (43), both of which are mounted on the support platform (42), and the positions of the two support blocks (43) on the support platform (42) have a degree of freedom to be adjusted along a first direction; A positioning pin (44) is detachably mounted on the support block (43), and the positioning pin (44) slides in conjunction with the first positioning hole (11); A clamping mechanism (45) is installed on the clamping plate (41) for pressing the bearing seat as a whole onto the two support blocks (43).

9. The machining process for the split bearing housing as described in claim 8, characterized in that, The clamping mechanism (45) includes: The pressure plate (451) is slidably disposed on the clamping plate (41) along the second direction and is arranged parallel to the support platform (42) at intervals; An elastic element (452) is installed between the pressure plate (451) and the clamping plate (41) for pushing the pressure plate (451) to move away from the support platform (42); A pressure rod (453) is hinged in the middle on the clamping plate (41). One end of the pressure rod (453) is used to press the pressure plate (451), and the other end of the pressure rod (453) is hinged to a connecting rod (454). The connecting rod (454) is used to connect to the drive end of the lathe hydraulic cylinder.

10. The machining process for the split bearing housing as described in claim 8, characterized in that, The distance between the axes of the two first positioning holes (11) and the axis of the bearing seat inner hole along the first direction is equal. The projection line of the axis of the clamping plate (41) on the support platform (42) is defined as the reference line. The distance between the axes of the two positioning pins (44) and the reference line along the first direction is equal. The two support blocks (43) are equidistantly translated on the support platform (42) relative to the reference line.

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