A processing method for a split differential housing

Abstract

This invention discloses a method for machining a split differential housing. First, the left journal, left flange, left step, right journal, right flange, right step, and planetary gear mounting surface are rough-machined on separate left and right housings. Then, the left and right housings are pre-assembled to obtain a semi-finished split differential housing. Finally, the left journal, left flange, left step, right journal, right flange, right step, and planetary gear mounting surface of the semi-finished split differential housing are finish-machined. This ensures the coaxiality of the left and right journals and the planetary gear mounting surface, and guarantees the runout of the left flange end face relative to the right journal, as well as the runout of the right flange end face relative to the left journal. The resulting split differential housing has high precision, simplifies the process, reduces the number of clamping operations, improves machining efficiency, and thus increases production output.

Description

Technical Field

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

[0002] With the development of the new energy vehicle industry, improving driving range has always been a goal for automakers, and lightweighting of components is an important way to achieve this goal. The automotive differential is a crucial component of the drive axle assembly, mainly composed of the differential housing, half-shaft gears, planetary gears, and gear carrier. Its function is to allow the left and right (or front and rear) wheels to rotate at different speeds when the vehicle is turning or driving on uneven surfaces, ensuring that the drive wheels on both sides perform pure rolling motion and reducing tire-to-ground friction. The differential housing serves as the mounting base for all components within the differential, providing protection for these internal parts.

[0003] The structure of the split differential housing in the prior art is as follows: Figure 1 As shown, the differential housing includes a left housing 1 and a right housing 2, which are fixedly connected by bolts. The left housing 1 includes a left flange 105, a left planetary gear mounting part, a left transition housing part, a left journal 101, and a mating boss 106. The left flange 105 has multiple evenly distributed left connecting holes 108. The left planetary gear mounting part has a planetary gear mounting surface 104, which is an outer cylindrical surface. The mating boss 106 protrudes from the end face of the left flange 105. A left step 109 is provided at the connection between the left journal 101 and the left transition housing part. The left journal 101 has a left half-shaft hole 102 and a left half-shaft gear hole 103. A spiral oil passage, referred to as the left oil passage 107, is provided in the left half-shaft hole 102. The right housing 2 includes a right flange 205, a right planetary shaft mounting part, a right transition housing part, a right journal 201, and a mating groove 206. The mating boss 106 of the left housing 1 is adapted to the mating groove 206 of the right housing 2. The right flange 205 has multiple evenly distributed right connecting holes 208. The right planetary shaft mounting part has an outer cylindrical circumferential surface, referred to as the right circumferential surface 210. The right planetary shaft mounting part has a planetary shaft hole 204. A planetary gear washer mounting surface is provided on the inner wall of the right housing 2 at the planetary shaft hole 204. The planetary gear washer mounting surface is an inner spherical surface 211. A right step 209 is provided at the connection between the right journal 201 and the right transition housing part. The right journal 201 has a right half-shaft hole 202 and a right half-shaft gear hole 203. A spiral oil passage, referred to as the right oil passage 207, is provided in the right half-shaft hole 202. The right planetary shaft mounting part has a pin hole 212 that vertically penetrates the planetary shaft hole 204.

[0004] The current manufacturing process for split differential housings is as follows:

[0005] 1. First, perform rough machining on the left housing, left journal, left half shaft hole, left flange, left connecting hole, etc., according to the technical requirements of the drawings, and then perform fine machining.

[0006] 2. Roughly machine the right journal, right half shaft hole, right flange, planetary shaft hole, inner spherical surface, and connecting hole of the differential right housing according to the technical requirements of the drawings, and then perform fine machining.

[0007] 3. Send the finished left and right shells to the assembly plant.

[0008] Because the left and right housings are machined separately, the coaxiality of the left and right journals and the planetary gear mounting surfaces is difficult to guarantee. Furthermore, the runout of the left flange end face relative to the right journal and the right flange end face relative to the left journal are also difficult to guarantee, meaning machining accuracy is hard to ensure. Additionally, the complex processes and numerous clamping operations result in long machining times and low production output. Summary of the Invention

[0009] To overcome the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a machining method for a split differential housing, which produces a split differential housing with high precision, simplifies the process, reduces the number of clamping operations, improves machining efficiency, and thus increases production output.

[0010] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0011] A method for processing a split differential housing, characterized in that it includes processing the left housing (1) of the split differential housing and processing the right housing (2) of the split differential housing, then pre-assembling the left housing (1) and the right housing (2) to obtain a semi-finished split differential housing (3), and processing the semi-finished split differential housing (3);

[0012] The processing of the left housing includes the following steps:

[0013] a. Select a qualified differential left housing blank, and use the end face of the left journal (101), the outer circumferential surface of the left journal (101) and the blank surface of the left half shaft hole (102) as references for clamping and positioning. Roughly machine the planetary gear mounting surface (104), the outer circumferential surface and two end faces of the left flange (105), and the outer circumferential surface of the mating boss (106).

[0014] b. Using the outer circumferential surface and left end face of the left flange (105) and the planetary gear mounting surface (104) obtained in step a as reference, clamp and position the left journal (101), the end face of the left half shaft hole (102), the left half shaft gear hole (103), and the left oil passage (107) as rough and finish turning, and rough turning the outer circumferential surface of the left journal (101) and the left step (109).

[0015] c. Using the left journal (101), left step (109) and left half shaft hole (102) obtained in step b as references, clamp and position them, finish machine the right end face of the left flange (105), the outer circumferential surface of the mating boss (106) and the end face, and machine the left connecting hole (108).

[0016] The processing of the right housing includes the following steps:

[0017] d. Select a qualified differential right housing blank, and use the end face of the right journal (201), the outer circumferential surface of the right journal (201) and the blank surface of the right half shaft hole (202) as references for clamping and positioning. Rough turn the outer circumferential surface of the right flange (205) and the left end face of the right flange (205), and finish turn the right circumferential surface (210) of the right planetary shaft mounting part.

[0018] e. Using the outer circumferential surface of the right flange (205) obtained in step d, the left end face of the right flange (205) and the right circumferential surface (210) as references, clamp and position the right journal (201), the end face of the right half shaft hole (202), the right half shaft gear hole (203) and the right oil passage (207) as rough and finish turning, and rough turning the outer circumferential surface, the right step (209) and the inner spherical surface (211) of the right journal (201);

[0019] f. Using the end face and outer circumferential surface of the right journal (201) obtained in step e, the right step (209), and the outer circumferential surface of the right flange (205) as references, clamp and position the right flange (205), finish machine the left end face, the circumferential surface and end face of the mating groove (206), and the inner spherical surface (211), and machine the planetary shaft hole (204), the right connecting hole (208), and the pin hole (212);

[0020] The processing of the semi-finished split differential housing includes the following steps:

[0021] g. Using the left half-shaft hole (102), the right half-shaft hole (202), and the planetary shaft hole (204) of the semi-finished split differential housing as references, clamp and position the outer circumferential surface of the left journal (101), the left step (109), the outer circumferential surface of the right journal (201), the right step (209), the planetary gear mounting surface (104), the outer circumferential surface and left end face of the left flange (105), and the outer circumferential surface of the right flange (205).

[0022] Preferably, in step a, a general-purpose CNC lathe is used for machining, the three-jaw chuck of the general-purpose CNC lathe is used to clamp the left journal (101), and at the same time, the center (3) of the general-purpose CNC lathe is pushed into the left half-shaft hole (102) to complete the clamping and positioning in step a.

[0023] Preferably, in step a, the machining sequence is as follows: rough turning the outer circumferential surface of the mating boss (106), rough turning the right end face, outer circumferential surface and left end face of the left flange (105), and rough turning the planetary gear mounting surface (104).

[0024] Preferably, in step b, a general-purpose CNC lathe is used for machining, and the double-layer self-centering fixture of the general-purpose CNC lathe clamps the planetary gear mounting surface (104), the outer circumferential surface of the left flange (105) and the left end face to complete the clamping and positioning in step b.

[0025] Preferably, in step b, the machining sequence is as follows: rough turning the end face of the left journal (101), rough turning the outer circumferential surface of the left journal (101), rough turning the end face of the left step (109), rough turning and finish turning the left half-shaft gear hole 103, rough turning and finish turning the left half-shaft hole (102), and rough turning and finish turning the left oil passage (107).

[0026] Preferably, in step c, a general-purpose CNC lathe is used for machining. The three-jaw chuck of the general-purpose CNC lathe clamps the left journal (101), and at the same time, the center (3) of the general-purpose CNC lathe is pushed into the left half-shaft hole (102) to complete the clamping and positioning in step c.

[0027] Preferably, in step c, the processing sequence is as follows: machining the left connecting hole (108), precision machining the right end face of the left flange (105), and precision machining the outer circumferential surface and end face of the mating boss (106).

[0028] Preferably, in step d, a general-purpose CNC lathe is used for machining, the three-jaw chuck of the general-purpose lathe is used to clamp the right journal (201), and at the same time, the center (3) of the general-purpose CNC lathe is pushed into the right half-shaft hole (202) to complete the clamping and positioning in step d.

[0029] Preferably: In step g, a general-purpose CNC lathe is used for machining, the center (3) of the general-purpose CNC lathe is inserted into the left half-shaft hole (102), and the right half-shaft hole (202) and the planetary shaft hole (204) are positioned by a combination tooling to complete the clamping and positioning in step g;

[0030] The combined positioning fixture includes a planetary shaft hole positioning cylindrical rod, a center connecting rod, and a center. The center connecting rod is coaxial with and fixedly connected to the center. A central threaded hole is provided at the conical head of the center. One end of the center connecting rod is threadedly connected to the central threaded hole.

[0031] The planetary shaft hole positioning cylindrical rod is perpendicular to the center connecting rod and is threadedly connected. There are two planetary shaft hole positioning cylindrical rods, which are symmetrical with respect to the center connecting rod.

[0032] Preferably, in step g, the machining sequence is as follows: finish turning the outer circumferential surface of the left journal (101), finish turning the left step (109), finish turning the planetary gear mounting surface (104), finish turning the left end face of the left flange (105), finish turning the outer circumferential surface of the left flange (105), finish turning the outer circumferential surface of the right flange (205), finish turning the right step (209), and finish turning the outer circumferential surface of the right journal (201).

[0033] After adopting the above technical solution, the beneficial effects of the present invention are:

[0034] The machining method of the split differential housing of the present invention involves first rough machining the left journal, left flange, left step, right journal, right flange, right step, and planetary gear mounting surface on the separate left and right housings. Then, the left and right housings are pre-assembled to obtain a semi-finished split differential housing. Finally, the left journal, left flange, left step, right journal, right flange, right step, and planetary gear mounting surface of the semi-finished split differential housing are finish machined. This ensures the coaxiality of the left journal, right journal, and planetary gear mounting surface, and guarantees the runout of the left flange end face relative to the right journal, as well as the runout of the right flange end face relative to the left journal. This results in a high-precision split differential housing, simplifies the process, reduces the number of clamping operations, improves machining efficiency, and thus increases production output. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the split differential housing of the present invention;

[0036] Figure 2 This is a schematic diagram of the machining process a for the left shell.

[0037] Figure 3 This is a schematic diagram of the b-processing step for the left shell.

[0038] Figure 4 This is a schematic diagram of the c-process of the left shell.

[0039] Figure 5 This is a schematic diagram of the d-process machining of the right shell;

[0040] Figure 6 This is a schematic diagram of the machining process e on the right shell.

[0041] Figure 7 This is a schematic diagram of the right shell machining process (f).

[0042] Figure 8 This is a schematic diagram of the g-processing of the semi-finished split differential housing;

[0043] Figure 9 yes Figure 8 Schematic diagram of the combined positioning fixture;

[0044] In the picture:

[0045] 1. Left housing; 101. Left journal; 102. Left half-shaft hole; 103. Left half-shaft gear hole; 104. Planetary gear mounting surface; 105. Left flange; 106. Mating boss; 107. Left oil passage; 108. Left connecting hole; 109. Left step; 2. Right housing; 201. Right journal; 202. Right half-shaft hole; 203. Right half-shaft gear hole; 204. Planetary shaft hole; 205. Right flange; 206. Mating groove; 207. Right oil passage; 208. Right connecting hole; 209. Right step; 210. Right circumferential surface; 211. Inner spherical surface; 212. Pin hole; 3. Center; 4. Planetary shaft hole positioning cylindrical rod; 5. Center connecting rod; 301. Center cone. Detailed Implementation

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0047] It should be noted that, Figures 2 to 8 In the middle, the bolded lines represent the parts that need to be processed in each step.

[0048] An embodiment of the present invention discloses a method for processing a split differential housing, including processing the left housing 1 of the split differential housing and processing the right housing 2 of the split differential housing, then pre-assembling the left housing 1 and the right housing 2 to obtain a semi-finished split differential housing 3, and processing the semi-finished split differential housing 3.

[0049] The processing of the left housing includes the following steps:

[0050] a. Select a qualified left differential housing blank, such as Figure 2 As shown, the end face of the left journal 101, the outer circumferential surface of the left journal 101, and the blank surface of the left half-shaft hole 102 are used as references for clamping and positioning. The planetary gear mounting surface 104, the outer circumferential surface and two end faces of the left flange 105, and the outer circumferential surface of the mating boss 106 are rough-machined.

[0051] The aforementioned differential left housing blank is obtained by integral casting.

[0052] b, such as Figure 3 As shown, the outer circumferential surface and left end face of the left flange 105 and the planetary gear mounting surface 104 obtained in step a are used as references for clamping and positioning. The end face of the left journal 101, the left half shaft hole 102, the left half shaft gear hole 103, and the left oil passage 107 are rough-machined and finish-machined. The outer circumferential surface of the left journal 101 and the left step 109 are rough-machined.

[0053] c. For example Figure 4 As shown, the left journal 101, left step 109 and left half shaft hole 102 obtained in step b are used as references for clamping and positioning. The right end face of the left flange 105, the outer circumferential surface of the mating boss 106 and the end face are precision machined, and the left connecting hole 108 is machined.

[0054] The processing of the right housing includes the following steps:

[0055] d. For example Figure 5 As shown, a qualified differential right housing blank is selected, and the end face of the right journal 201, the outer circumferential surface of the right journal 201 and the blank surface of the right half shaft hole 202 are used as references for clamping and positioning. The outer circumferential surface of the right flange 205 and the left end face of the right flange 205 are rough-machined, and the right circumferential surface 210 of the right planetary shaft mounting part is finish-machined.

[0056] e. For example Figure 6 As shown, the outer circumferential surface of the right flange 205, the left end face of the right flange 205, and the right circumferential surface 210 obtained in step d are used as references for clamping and positioning. The end face of the right journal 201, the right half-shaft hole 202, the right half-shaft gear hole 203, and the right oil passage 207 are rough-machined and finish-machined. The outer circumferential surface, the right step 209, and the inner spherical surface 211 of the right journal 201 are rough-machined.

[0057] f. For example Figure 7As shown, the end face and outer peripheral surface of the right journal 201, the right step 209, and the outer peripheral surface of the right flange 205, which were processed in step e, are used as references for clamping and positioning. The left end face, the peripheral surface and end face of the mating groove 206, and the inner spherical surface 211 of the right flange 205 are precision machined, and the planetary shaft hole 204, the right connecting hole 208, and the pin hole 212 are machined.

[0058] The aforementioned differential right housing blank is obtained by integral casting.

[0059] The machining of the semi-finished split-type differential housing includes the following steps:

[0060] g, such as Figure 8 As shown, the left half-shaft hole 102, the right half-shaft hole 202, and the planetary shaft hole 204 of the semi-finished split differential housing are used as references for clamping and positioning. The outer circumferential surface of the left journal 101, the left step 109, the outer circumferential surface of the right journal 201, the right step 209, the planetary gear mounting surface 104, the outer circumferential surface and left end face of the left flange 105, and the outer circumferential surface of the right flange 205 are precision machined.

[0061] The left and right housings can be machined simultaneously on different CNC lathes to save time. A semi-finished split-type differential housing is formed by pre-assembling the left and right housings with bolts. Then, the left journal, left flange, left step, right journal, right flange, right step, and planetary gear mounting surface of the semi-finished split-type differential housing are precision machined. This ensures the coaxiality of the left and right journals and the planetary gear mounting surface, and guarantees the runout of the left flange end face relative to the right journal, as well as the runout of the right flange end face relative to the left journal.

[0062] The left and right housings are pre-assembled with bolts, and the bolt tightening force is 7 N·m to 9 N·m during pre-assembly.

[0063] In some embodiments, as Figure 2 As shown, in step a, a general-purpose CNC lathe is used for machining. The three-jaw chuck of the general-purpose CNC lathe clamps the left journal 101. At the same time, the center 3 of the general-purpose CNC lathe is pushed into the left half-shaft hole 102 to complete the clamping and positioning in step a.

[0064] In some embodiments, in step a, the machining sequence is as follows: rough turning the outer circumferential surface of the mating boss 106, rough turning the right end face, outer circumferential surface and left end face of the left flange 105, and rough turning the planetary gear mounting surface 104.

[0065] In some embodiments, in step b, a general-purpose CNC lathe is used for machining, and the double-layer self-centering fixture of the general-purpose CNC lathe clamps the planetary gear mounting surface 104, the outer circumferential surface of the left flange 105 and the left end face to complete the clamping and positioning in step b.

[0066] In some embodiments, in step b, the machining sequence is as follows: rough turning the end face of the left journal 101, rough turning the outer circumferential surface of the left journal 101, rough turning the end face of the left step 109, rough turning and finish turning the left half-shaft gear hole 103, rough turning and finish turning the left half-shaft hole 102, and rough turning and finish turning the left oil passage 107.

[0067] In some embodiments, in step c, a general-purpose CNC lathe is used for machining. The three-jaw chuck of the general-purpose CNC lathe clamps the left journal 101, and at the same time, the center 3 of the general-purpose CNC lathe is pushed into the left half-shaft hole 102 to complete the clamping and positioning in step c.

[0068] In some embodiments, in step c, the processing sequence is as follows: machining the left connecting hole 108, precision machining the right end face of the left flange 105, and precision machining the outer circumferential surface and end face of the mating boss 106.

[0069] In some embodiments, in step d, a general-purpose CNC lathe is used for machining. The three-jaw chuck of the general-purpose lathe clamps the right journal 201, and at the same time, the center 3 of the general-purpose CNC lathe is pushed into the right half-shaft hole 202. The clamping and positioning in step d is completed in one clamping.

[0070] In some embodiments, in step d, the machining sequence is as follows: rough machining of the outer circumferential surface of the right flange 205, rough machining of the left end face of the right flange 205, and finish machining of the right circumferential surface 210.

[0071] In some embodiments, in step e, a general-purpose CNC lathe is used for machining, and the double-layer self-centering fixture of the general-purpose CNC lathe clamps the right circumferential surface 210 of the right planetary shaft mounting part, the outer circumferential surface of the right flange 205 and the left end face to complete the clamping and positioning in step e.

[0072] In some embodiments, in step e, the machining sequence is as follows: rough turning the end face of the right journal 201, rough turning the outer circumferential surface of the right journal 201, rough turning the end face of the right step 209, rough turning the inner spherical surface 211, rough turning and finish turning the right half-shaft gear hole 203, rough turning and finish turning the right half-shaft hole 202, and rough turning and finish turning the right oil passage 207.

[0073] In some embodiments, in step f, a general-purpose CNC lathe is used for machining, and the double-layer self-centering fixture of the general-purpose CNC lathe clamps the outer circumferential surface of the right journal 201, the outer end face of the right journal 201, and the outer circumferential surface of the right flange 205 to complete the clamping and positioning in step f.

[0074] In some embodiments, in step f, the machining sequence is as follows: rough turning and finish turning the circumferential surface and end face of the mating groove 206, finish turning the left end face of the right flange 205, finish turning the inner spherical surface 211, drilling and reaming the planetary shaft hole 204, drilling the right connecting hole 208, and drilling the pin hole 212.

[0075] In some embodiments, in step g, a general-purpose CNC lathe is used for machining, the center (3) of the general-purpose CNC lathe is inserted into the left half-shaft hole (102), and the right half-shaft hole (202) and the planetary shaft hole (204) are positioned by a combination fixture to complete the clamping and positioning in step g;

[0076] like Figure 8 and Figure 9 As shown, the combined positioning fixture includes a planetary shaft hole positioning cylindrical rod 4, a center connecting rod 5, and a center. The center connecting rod 5 is coaxial with and fixedly connected to the center. A central threaded hole is provided at the cone 301 of the center. One end of the center connecting rod 5 is threadedly connected to the central threaded hole.

[0077] The planetary shaft hole positioning cylindrical rod 4 and the center connecting rod 5 are perpendicular to each other and threaded together. There are two planetary shaft hole positioning cylindrical rods 4, which are symmetrical with respect to the center connecting rod 5.

[0078] During positioning, the two planetary shaft hole positioning cylindrical rods 4 pass through the two opposite planetary shaft holes 204 respectively, and the cone 301 of the tip enters the right half shaft hole (202). Its conical surface positions the right half shaft hole (202). The tip connecting rod 5 is fixedly connected to the tip and the planetary shaft hole positioning cylindrical rod 4 respectively. Then, the overall cross-shaped combination positioning fixture and the tip of the positioning left housing cooperate to position the semi-finished split-type differential housing.

[0079] In some embodiments, in step g, the machining sequence is as follows: finish turning the outer circumferential surface of the left journal 101, finish turning the left step 109, finish turning the planetary gear mounting surface 104, finish turning the left end face of the left flange 105, finish turning the outer circumferential surface of the left flange 105, finish turning the outer circumferential surface of the right flange 205, finish turning the right step 209, and finish turning the outer circumferential surface of the right journal 201.

[0080] Both the left housing 1 and the right housing 2 are machined using CNC lathes, which requires fewer types of machine tools and saves costs.

[0081] The machining method for the split differential housing of this invention involves first rough machining the left journal, left flange, left step, right journal, right flange, right step, and planetary gear mounting surface on the separate left and right housings. Then, the left journal, left flange, left step, right journal, right flange, right step, and planetary gear mounting surface of the semi-finished split differential housing are finish machined. This ensures the coaxiality of the left journal, right journal, and planetary gear mounting surface, and guarantees the runout of the left flange end face relative to the right journal, as well as the runout of the right flange end face relative to the left journal. This method ensures the machining accuracy of the split differential housing, simplifies the process, reduces the number of clamping operations, improves machining efficiency, and thus increases production output.

[0082] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A method for machining a split-type differential housing, characterized in that, The process includes machining the left housing (1) of the split differential housing and machining the right housing (2) of the split differential housing. Then, the left housing (1) and the right housing (2) are pre-assembled to obtain a semi-finished split differential housing (3), and the semi-finished split differential housing (3) is machined. The processing of the left housing includes the following steps: a. Select a qualified differential left housing blank, and use the end face of the left journal (101), the outer circumferential surface of the left journal (101) and the blank surface of the left half shaft hole (102) as references for clamping and positioning. Roughly machine the planetary gear mounting surface (104), the outer circumferential surface and two end faces of the left flange (105), and the outer circumferential surface of the mating boss (106). b. Using the outer circumferential surface and left end face of the left flange (105) and the planetary gear mounting surface (104) obtained in step a as reference, clamp and position the left journal (101), the end face of the left half shaft hole (102), the left half shaft gear hole (103), and the left oil passage (107) as rough and finish turning, and rough turning the outer circumferential surface of the left journal (101) and the left step (109). c. Using the left journal (101), left step (109) and left half shaft hole (102) obtained in step b as references, clamp and position them, finish machine the right end face of the left flange (105), the outer circumferential surface of the mating boss (106) and the end face, and machine the left connecting hole (108). The processing of the right housing includes the following steps: d. Select a qualified differential right housing blank, and use the end face of the right journal (201), the outer circumferential surface of the right journal (201) and the blank surface of the right half shaft hole (202) as references for clamping and positioning. Rough turn the outer circumferential surface of the right flange (205) and the left end face of the right flange (205), and finish turn the right circumferential surface (210) of the right planetary shaft mounting part. e. Using the outer circumferential surface of the right flange (205) obtained in step d, the left end face of the right flange (205) and the right circumferential surface (210) as references, clamp and position the right journal (201), the end face of the right half shaft hole (202), the right half shaft gear hole (203) and the right oil passage (207) as rough and finish turning, and rough turning the outer circumferential surface, the right step (209) and the inner spherical surface (211) of the right journal (201); f. Using the end face and outer circumferential surface of the right journal (201) obtained in step e, the right step (209), and the outer circumferential surface of the right flange (205) as references, clamp and position the right flange (205), finish machine the left end face, the circumferential surface and end face of the mating groove (206), and the inner spherical surface (211), and machine the planetary shaft hole (204), the right connecting hole (208), and the pin hole (212); The processing of the semi-finished split differential housing includes the following steps: g. Using the left half-shaft hole (102), the right half-shaft hole (202), and the planetary shaft hole (204) of the semi-finished split differential housing as references, clamp and position the outer circumferential surface of the left journal (101), the left step (109), the outer circumferential surface of the right journal (201), the right step (209), the planetary gear mounting surface (104), the outer circumferential surface and left end face of the left flange (105), and the outer circumferential surface of the right flange (205).

2. The processing method of a split differential housing as described in claim 1, characterized in that: In step a, a general-purpose CNC lathe is used for machining. The three-jaw chuck of the general-purpose CNC lathe clamps the left journal (101). At the same time, the center (3) of the general-purpose CNC lathe is pushed into the left half-shaft hole (102) to complete the clamping and positioning in step a.

3. The processing method of a split differential housing as described in claim 1, characterized in that: In step a, the machining sequence is as follows: rough turning the outer circumferential surface of the mating boss (106), rough turning the right end face, outer circumferential surface and left end face of the left flange (105), and rough turning the planetary gear mounting surface (104).

4. The method for processing a split differential housing as described in claim 1, characterized in that: In step b, a general-purpose CNC lathe is used for machining. The double-layer self-centering fixture of the general-purpose CNC lathe clamps the planetary gear mounting surface (104), the outer circumferential surface of the left flange (105), and the left end face to complete the clamping and positioning in step b.

5. The processing method of a split differential housing as described in claim 1, characterized in that: In step b, the machining sequence is as follows: rough turning the end face of the left journal (101), rough turning the outer circumferential surface of the left journal (101), rough turning the end face of the left step (109), rough turning and finish turning the left half-shaft gear hole 103, rough turning and finish turning the left half-shaft hole (102), and rough turning and finish turning the left oil passage (107).

6. The method for processing a split differential housing as described in claim 1, characterized in that: In step c, a general-purpose CNC lathe is used for machining. The three-jaw chuck of the general-purpose CNC lathe clamps the left journal (101). At the same time, the center (3) of the general-purpose CNC lathe is pushed into the left half-shaft hole (102) to complete the clamping and positioning in step c.

7. The method for processing a split differential housing as described in claim 1, characterized in that: In step c, the processing sequence is as follows: machining the left connecting hole (108), precision machining the right end face of the left flange (105), and precision machining the outer circumferential surface and end face of the mating boss (106).

8. The method for processing a split differential housing as described in claim 1, characterized in that: In step d, a general-purpose CNC lathe is used for machining. The three-jaw chuck of the general-purpose CNC lathe clamps the right journal (201). At the same time, the center (3) of the general-purpose CNC lathe is pushed into the right half-shaft hole (202) to complete the clamping and positioning in step d.

9. The method for processing a split differential housing as described in claim 1, characterized in that: In step g, a general-purpose CNC lathe is used for machining. The center (3) of the general-purpose CNC lathe is inserted into the left half-shaft hole (102), and the right half-shaft hole (202) and the planetary shaft hole (204) are positioned using a combination positioning fixture to complete the clamping and positioning in step g. The combined positioning fixture includes a planetary shaft hole positioning cylindrical rod, a center connecting rod, and a center. The center connecting rod is coaxial with and fixedly connected to the center. A central threaded hole is provided at the conical head of the center. One end of the center connecting rod is threadedly connected to the central threaded hole. The planetary shaft hole positioning cylindrical rod is perpendicular to the center connecting rod and is threadedly connected. There are two planetary shaft hole positioning cylindrical rods, which are symmetrical with respect to the center connecting rod.

10. A method for processing a split differential housing as described in claim 1, characterized in that: In step g, the machining sequence is as follows: finish turning the outer circumferential surface of the left journal (101), finish turning the left step (109), finish turning the planetary gear mounting surface (104), finish turning the left end face of the left flange (105), finish turning the outer circumferential surface of the left flange (105), finish turning the outer circumferential surface of the right flange (205), finish turning the right step (209), and finish turning the outer circumferential surface of the right journal (201).

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