A mold for planetary carrier casting and its casting process

Abstract

This invention discloses a mold for planetary carrier casting and its casting process, relating to the casting field. The mold includes a mold body comprising a first template, a second template, a third template, and a fourth template, which are sequentially assembled to form the mold body. A forming space is provided within the mold body, and a gating system communicating with the forming space is provided at the top of the first template. A gating structure is provided at the top of the gating system, comprising a direct heating sleeve, a first sand-coated gating cup, a filter structure, and a second sand-coated gating cup. These components are sequentially assembled and fixed from bottom to top. A clamp is fitted onto the outer side of the mold body. The gating system of this invention, as a unique pouring location, is situated at the intersection of the tooth head and the plane, and can utilize a semi-cylindrical riser to create a feeding channel for the tooth portion within the mold body.

Description

Technical Field

[0001] This invention relates to the field of casting, and in particular to a mold for casting planetary carriers and its casting process. Background Technology

[0002] The maximum dimensions of the ductile iron planetary carrier casting are φ333mm×355mm, with a wall thickness of about 60mm in key areas and a single piece weight of about 65Kg. Currently, it is mostly produced using self-hardening resin sand and other methods. However, after multiple batch productions, it was found that the shrinkage cavity and porosity scrap rate of the ductile iron planetary carrier can sometimes reach as high as 50%, resulting in serious cost losses. Moreover, the ductile iron planetary carriers in the above proportion do not include those that were not discovered after processing. Therefore, it can be seen that the ductile iron planetary carriers produced according to the current technology still have certain safety hazards.

[0003] Regarding the above issues, the applicant, based on observations at the production site and years of production experience, has found that the commonly used design method for planetary carriers made of ductile iron is self-hardening resin sand molding, using a complete gating system or independent gating and riser shapes. Therefore, even if the hot core box casting process is used, if the gating and riser positions and riser pad designs are improper, if flat casting and vertical casting are not used, and if special clamps are not used to secure the sand mold, then the casting will still experience shrinkage cavities and porosity. Even if shrinkage cavities and porosity do not occur during machining, there is still a certain risk. Therefore, not only is the scrap rate high, but the process yield is also low and the cost is high. Summary of the Invention

[0004] This application proposes a mold for planetary carrier casting and its casting process, which solves the technical problems mentioned in the background art.

[0005] To achieve the above objectives, this application adopts the following technical solution: a mold for planetary carrier casting, comprising a mold body, the mold body comprising a first template, a second template, a third template and a fourth template, the first template, the second template, the third template and the fourth template being sequentially assembled to form the mold body, the mold body having a forming space, and the top of the first template having a gating and riser communicating with the forming space, the top of the gating and riser having a gating structure, the gating structure comprising a direct heating sleeve, a first sand-coated gating cup, a filter structure and a second sand-coated gating cup, the direct heating sleeve, the first sand-coated gating cup, the filter structure and the second sand-coated gating cup being sequentially assembled and fixed from bottom to top, and a clamping device being fitted on the outer side of the mold body.

[0006] Preferably, the filter structure is a ceramic filter screen, and the riser is specifically set as a semi-cylindrical riser and located in the intersection area between the tooth head of the workpiece and the plane in the subsequent casting mold body.

[0007] Preferably, the clamp consists of two first clamping plates and a first fastener installed between the two first clamping plates, and the two first clamping plates are located outside the first template side and the fourth template side, respectively, when clamping.

[0008] Preferably, the front and rear ends of the two first clamping plates are provided with semi-open slots, and the two semi-open slots in adjacent positions form an assembly space. The fastener includes a long bolt and a second clamping plate. The long bolt is fitted into the corresponding assembly space, and one end of the long bolt is threaded with a second limiting nut. The helical locking of the second limiting nut and the long bolt can clamp and limit the two first clamping plates and the mold body between the two first clamping plates.

[0009] Preferably, the clamp consists of a second clamping plate, a third clamping plate, and a second fastener installed between the second and third clamping plates. The front and rear ends of the second clamping plate and the front and rear ends of the third clamping plate are provided with clearance holes. The second fastener includes a long screw and first limiting nuts threaded to the surfaces of the two ends of the long screw. The two ends of the long screw are respectively fitted into two clearance holes in adjacent positions. The two first limiting nuts are respectively threaded to the surfaces of the two ends of the long screw and respectively fit against the sides of the second clamping plate and the sides of the third clamping plate.

[0010] Preferably, the front and rear ends of the second clamping plate and the front and rear ends of the third clamping plate are provided with threaded holes. The threaded holes on the second clamping plate are connected to the clearance holes inside the clamping plate. The threaded holes on the third clamping plate are connected to the clearance holes inside the clamping plates. An auxiliary positioning screw is threaded into the threaded holes to press and limit the long screw installed in the clearance holes.

[0011] Preferably, a mounting hole is provided in the middle of the second clamping plate, and a support frame plate is fixedly nested in the mounting hole. An adjustment space is formed between the surface of the support frame plate and the inner wall of the mounting hole. A top-pressure transmission assembly is provided on one side of the support frame plate. The top-pressure transmission assembly includes several L-shaped pressure plates and support screws. Several L-shaped pressure plates are installed on the surface of the support frame plate along the circumference of the mounting hole. One end of the L-shaped pressure plate passes through the adjustment space and extends to the outside of the fourth template. Two L-shaped pressure plates in opposite positions can clamp and center the fourth template with the center of the support frame plate as a reference.

[0012] Preferably, an arc-shaped pressure block is fixed to the other end surface of the L-shaped pressure plate, the support screw is fixed to the middle surface of the support frame plate, a folding spring sheet is installed between the other end face of the L-shaped pressure plate and the surface of the support screw, and a slide rail fixed to one side of the support frame plate is snapped into the inside of the L-shaped pressure plate.

[0013] Preferably, a linkage pressing assembly is fitted on the outer side of the support screw. The linkage pressing assembly includes an inner threaded sleeve and an outer pressure sleeve. The inner threaded sleeve is fixedly nested in the middle inner side of the outer pressure sleeve in a coaxial manner. The inner threaded sleeve can be threadedly connected to the support screw. During the threaded connection between the inner threaded sleeve and the support screw, the outer pressure sleeve can synchronously press the arc-shaped pressure blocks on the two adjacent L-shaped pressure plates, so that the two adjacent L-shaped pressure plates automatically clamp and center the fourth template. The long screw has several detection holes opened laterally along its own structure, and the detection holes include detection holes that can be aligned with the second template, the third template, and the fourth template, respectively.

[0014] Preferably, the casting process is operated as follows:

[0015] S1. The first template, the second template, the third template and the fourth template are spliced ​​together in sequence to form a mold body with a flat construction and vertical casting. The position of the gating gate is changed to the intersection area between the head of the tooth of the workpiece to be formed and the plane. At the same time, the gating gate is supplemented and the gating gate neck parameters are adjusted to ensure that the feeding channel for the tooth part in the mold body is opened.

[0016] S2. The direct heating jacket, the first sand-coated pouring cup, the filter structure and the second sand-coated pouring cup are assembled and fixed from bottom to top to form an independent pouring structure and connect it with the riser and gating system to complete the assembly work.

[0017] S3. The two first clamping plates and the first fastener installed between the two first clamping plates are assembled into a clamp and installed on the outside of the mold body to clamp and stabilize the mold body.

[0018] S4. Casting operations are carried out inside the mold body through the gating structure, and the carbon equivalent of the casting should be controlled at C%: 3.75±0.05%, Si%: 2.4±0.05%, CE%=C%+1 / 3Si%, CE%: 4.6±0.05%, and the pouring temperature of the casting is limited to 1350-1410°C.

[0019] In summary, the present invention has the following beneficial effects:

[0020] 1. The gating and riser provided in this invention is a unique pouring position located at the junction of the tooth head and the plane. Subsequently, a semi-cylindrical riser can be used to fill the shrinkage channel of the tooth part in the mold body, thus solving the existing problems.

[0021] 2. The direct heating sleeve, the first sand-coated pouring cup, the filter structure, and the second sand-coated pouring cup provided in this invention are combined to form an independent top pouring gate structure that has both slag filtering and feeding functions. When used in combination with the mold body, it can further improve the casting processing quality.

[0022] 3. The present invention adopts a method of flat casting and vertical casting, and cooperates with corresponding fixtures, thereby ensuring the stable dimensions of the casting while ensuring sequential and simultaneous solidification of the casting, resulting in a sound and dense casting.

[0023] 4. In this invention, the carbon equivalent of the casting raw material is controlled within the range of C%: 3.8±0.05%, Si%: 2.4±0.05%, CE%=C%+1 / 3Si%, and CE%: 4.6±0.05%, which helps to obtain a sound casting. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of Embodiment 1 of the present invention;

[0025] Figure 2 This is a front view schematic diagram of the gate structure of the present invention;

[0026] Figure 3 This is a top view of the gating system of the present invention;

[0027] Figure 4 This is a three-dimensional schematic diagram of Embodiment 2 of the present invention;

[0028] Figure 5 This is a front view schematic diagram of Embodiment 2 of the present invention;

[0029] Figure 6 This is a cross-sectional schematic diagram of the top-pressure transmission assembly of the present invention;

[0030] Figure 7 This is an enlarged schematic diagram of the L-shaped pressure plate of the present invention;

[0031] Figure 8 yes Figure 7 Enlarged diagram of point A in the middle.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. First template; 2. Second template; 3. Third template; 4. Fourth template; 5. Gating and riser; 6. Direct heating sleeve; 7. First sand-coated pouring cup; 8. Filter structure; 9. Second sand-coated pouring cup; 10. First clamping plate; 11. Long bolt; 12. Second clamping plate; 13. Third clamping plate; 14. Long screw; 15. First limiting nut; 16. Support frame plate; 17. Top pressure transmission assembly; 171. L-shaped pressure plate; 172. Support screw; 173. Internal threaded sleeve; 174. External pressure sleeve; 175. Arc-shaped pressure block; 176. Slide rail; 177. Folding spring sheet; 18. Auxiliary positioning screw; 19. Inspection hole; 20. Second limiting nut. Detailed Implementation

[0034] The technical solution of the present invention will be clearly and completely described below with reference to preferred embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1

[0036] like Figures 1-3 A mold for planetary carrier casting includes a mold body, which includes a first template 1, a second template 2, a third template 3, and a fourth template 4. The first template 1, the second template 2, the third template 3, and the fourth template 4 are sequentially assembled to form the mold body. A forming space is provided inside the mold body. A gating gate 5 communicating with the forming space is provided on the top of the first template 1. A gating structure is provided on the top of the gating gate 5. The gating structure includes a direct heating sleeve 6, a first sand-coated gating cup 7, a filter structure 8, and a second sand-coated gating cup 9. The direct heating sleeve 6, the first sand-coated gating cup 7, the filter structure 8, and the second sand-coated gating cup 9 are sequentially assembled and fixed from bottom to top.

[0037] The filter structure 8 specifically adopts a ceramic filter screen, which ensures that its own structure is resistant to high temperature while filtering the filter residue in the casting raw material, thereby improving the subsequent casting quality. The riser 5 is specifically set as a semi-cylindrical riser and is located in the intersection area between the tooth head of the molded workpiece and the plane in the subsequent casting mold body, thereby ensuring that the feeding channel for the tooth part in the mold body is opened.

[0038] The outer side of the mold body is fitted with a clamp, which consists of two first clamping plates 10 and a first fastener installed between the two first clamping plates 10. When clamping, the two first clamping plates 10 are located on the outside of the first template 1 and the fourth template 4 respectively, thereby meeting the requirement of no shrinkage porosity in the casting of the mold body. The front and rear ends of the two first clamping plates 10 are provided with semi-open slots to facilitate the subsequent disassembly and replacement of the fasteners. The two semi-open slots in adjacent positions form an assembly space. The fasteners include a long bolt 11 and a second clamping plate 12. The long bolt 11 is fitted in the corresponding assembly space, and one end of the long bolt 11 is threadedly connected to a second limiting nut 20. The spiral locking of the second limiting nut 20 and the long bolt 11 can clamp and limit the two first clamping plates 10 and the mold body between the two first clamping plates 10, ensuring the stability and reliability of the mold body in subsequent use.

[0039] In use, the mold body is formed by assembling the first template 1, the second template 2, the third template 3, and the fourth template 4 in sequence. Then, the two first clamping plates 10 are positioned on the outside of the first template 1 and the fourth template 4 respectively and aligned. Next, the long bolt 11 is fitted into the two semi-open slots of the two first clamping plates 10 in relatively adjacent positions to form an assembly space. Then, the second limiting nut 20 is threaded to one end of the long bolt 11. Similarly, the remaining long bolt 11 is operated in the same way to finally clamp the mold body with the two first clamping plates 10 and form the mold body in a flat casting form. After that, the gating structure formed by assembling the direct heating sleeve 6, the first sand-coated gating cup 7, the filter structure 8, and the second sand-coated gating cup 9 is covered on the top of the gating riser 5 to complete the assembly work. Subsequently, the casting material is sent into the forming space of the mold body through the gating structure and the gating riser 5. After the workpiece is formed, the fixture and the mold body are disassembled.

[0040] Example 2

[0041] like Figures 4-8 The clamp consists of a second clamping plate 12, a third clamping plate 13, and a second fastener installed between the second clamping plate 12 and the third clamping plate 13. Relief holes are provided in the front and rear ends of the second clamping plate 12 and the front and rear ends of the third clamping plate 13. The second fastener includes a long screw 14 and first limiting nuts 15 threaded to the surfaces of both ends of the long screw 14. The two ends of the long screw 14 are respectively fitted into two relief holes in adjacent positions. The two first limiting nuts 15 are threaded to the surfaces of the ends of the long screw 14 and respectively fit against the sides of the second clamping plate 12 and the third clamping plate 13. Threaded holes are provided in the front and rear ends of the second clamping plate 12 and the front and rear ends of the third clamping plate 13. The threaded holes on the second clamping plate 12 communicate with the relief holes within it, and the threaded holes on the third clamping plate 13 communicate with the relief holes within it. An auxiliary positioning screw 18, capable of pressing and limiting the long screw 14 fitted into the relief holes, is threaded into the threaded holes.

[0042] A mounting hole is provided in the middle of the second clamping plate 12, and a support frame plate 16 is fixedly nested in the mounting hole. An adjustment space is formed between the surface of the support frame plate 16 and the inner wall of the mounting hole. A top-pressing transmission assembly 17 is provided on one side of the support frame plate 16. The top-pressing transmission assembly 17 includes several L-shaped pressure plates 171 and support screws 172. The several L-shaped pressure plates 171 are installed on the surface of the support frame plate 16 along the circumference of the mounting hole. One end of the L-shaped pressure plate 171 passes through the adjustment space and extends to the fourth template 4. On the outside, two L-shaped pressure plates 171 in relative positions can clamp and center the fourth template 4 with the center of the support frame plate 16 as a reference. An arc-shaped pressure block 175 is fixed on the other end surface of the L-shaped pressure plate 171. The support screw 172 is fixed on the middle surface of the support frame plate 16. A folding spring sheet 177 is installed between the other end face of the L-shaped pressure plate 171 and the surface of the support screw 172. The L-shaped pressure plate 171 is internally engaged with a slide rail 176 fixed on one side of the support frame plate 16.

[0043] A linkage pressing assembly is fitted on the outer side of the support screw 172. The linkage pressing assembly includes an inner threaded sleeve 173 and an outer pressure sleeve 174. The inner threaded sleeve 173 is fixedly nested in the middle inner side of the outer pressure sleeve 174 in a coaxial manner. The inner threaded sleeve 173 can be threadedly connected to the support screw 172. During the threaded connection between the inner threaded sleeve 173 and the support screw 172, the outer pressure sleeve 174 can simultaneously apply pressure to the arc-shaped pressure blocks 175 on the two adjacent L-shaped pressure plates 171, so that the two adjacent L-shaped pressure plates 171 automatically clamp and center the fourth template 4. The long screw 14 has several detection holes 19 opened laterally along its own structure. Among the several detection holes 19, there are detection holes 19 that can be aligned with the second template 2, the third template 3, and the fourth template 4 respectively.

[0044] In use, the first template 1, the second template 2, the third template 3 and the fourth template 4 are assembled together in sequence to form the mold body. Then, the second clamping plate 12 and the third clamping plate 13 are placed on the outside of the fourth template 4 and the outside of the first template 1 respectively and aligned.

[0045] Next, the outer pressure sleeve 174 is turned so that the outer pressure sleeve 174 drives the inner threaded sleeve 173 to rotate synchronously. Then, the inner threaded sleeve 173 and the support screw 172 engage with each other to simultaneously press the arc-shaped pressure blocks 175 on multiple L-shaped pressure plates 171. This allows two adjacent L-shaped pressure plates 171 to clamp and center the columnar surface of the fourth template 4, thus achieving the initial installation effect.

[0046] After the second clamping plate 12 and the fourth template 4 are assembled, one end of the long screw 14 is passed through the clearance hole inside the second clamping plate 12 and then through the clearance hole inside the third clamping plate 13. Then, the two first limiting nuts 15 are threaded to the two ends of the long screw 14 respectively. Similarly, the remaining long screw 14 is operated in the same way. Finally, the second clamping plate 12 and the third clamping plate 13 are clamped relative to the mold body and the mold body is formed into a flat casting form. Then, the gate structure formed by assembling the direct heating sleeve 6, the first sand-coated gate cup 7, the filter structure 8, and the second sand-coated gate cup 9 is covered on the top of the gating and riser 5 to complete the assembly work. Subsequently, the casting material is sent into the forming space of the mold body through the gate structure and the gating and riser 5. After the workpiece is formed, the fixture and the mold body are disassembled.

[0047] After the fixture is installed, the installation accuracy of each component inside the mold body can be initially checked by using multiple inspection holes 19 inside the long screw 14 in conjunction with an existing vernier caliper. Specifically, the inspection rod of the vernier caliper is inserted through the inspection hole 19 to contact the corresponding second template 2, third template 3, or fourth template 4, and the distance between the outer surface of the long screw 14 and the corresponding second template 2, third template 3, or fourth template 4 is measured. Then, the distance is compared with the inspection data of the pre-used standard parts. If it is within the error range, it indicates that the assembly accuracy of the mold body is good. Conversely, if it is not within the error range, it indicates that the assembly accuracy of the mold body is poor and rework is required in time.

[0048] like Figures 1-3 The specific operation of this casting process is as follows:

[0049] S1. The first template 1, the second template 2, the third template 3 and the fourth template 4 are spliced ​​together in sequence to form a mold body with a flat construction and vertical casting form. The position of the gating gate is changed to the intersection area between the head of the tooth of the workpiece to be formed and the plane. At the same time, the gating gate 5 is supplemented and the gating gate neck parameters are adjusted to ensure that the feeding channel for the tooth part in the mold body is opened.

[0050] S2. The direct heating sleeve 6, the first sand-coated pouring cup 7, the filter structure 8 and the second sand-coated pouring cup 9 are spliced ​​and fixed from bottom to top to form an independent pouring structure and connect it with the pouring and rising port 5 to complete the assembly work. More specifically, the ceramic filter has a diameter of 100mm and a thickness of 15mm.

[0051] S3. The two first clamping plates 10 and the first fastener installed between the two first clamping plates 10 are assembled into a clamp and installed on the outside of the mold body to clamp and stabilize the mold body.

[0052] S4. Casting operations are carried out inside the mold body through the gating structure, and the carbon equivalent of the casting should be controlled at C%: 3.75±0.05%, Si%: 2.4±0.05%, CE%=C%+1 / 3Si%, CE%: 4.6±0.05%, and the pouring temperature of the casting is limited to 1350-1410°C.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention. The invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A mold for casting a planetary carrier, comprising a mold body, characterized in that: The mold body includes a first template (1), a second template (2), a third template (3) and a fourth template (4), and the first template (1), the second template (2), the third template (3) and the fourth template (4) are sequentially spliced ​​to form a mold body in the form of flat casting. The mold body is provided with a molding space, and the top of the first template (1) is provided with a gating gate (5) that communicates with the molding space. The top of the gating gate (5) is provided with a gating structure. The gating structure includes a direct heating sleeve (6), a first sand-coated gating cup (7), a filter structure (8) and a second sand-coated gating cup (9). The direct heating sleeve (6), the first sand-coated gating cup (7), the filter structure (8) and the second sand-coated gating cup (9) are sequentially spliced ​​and fixed from bottom to top. The outside of the mold body is fitted with a clamp. The filter structure (8) specifically adopts a ceramic filter screen. The riser (5) is specifically set as a semi-cylindrical riser and is located in the intersection area of ​​the tooth head and the plane of the workpiece formed in the subsequent casting mold body. The fixture consists of two first clamping plates (10) and a first fastener installed between the two first clamping plates (10). When clamping, the two first clamping plates (10) are located outside the first template (1) and outside the fourth template (4) respectively. The front and rear ends of the two first clamping plates (10) are provided with semi-open slots, and the two semi-open slots in adjacent positions form an assembly space. The fastener includes a long bolt (11). The long bolt (11) is fitted in the corresponding assembly space, and one end of the long bolt (11) is threaded with a second limiting nut (20). The second limiting nut (20) and the long bolt (11) are screwed together to clamp and limit the two first clamping plates (10) and the mold body between the two first clamping plates (10).

2. A casting process utilizing the planetary carrier casting mold as described in claim 1, characterized in that: The specific operation of this casting process is as follows: S1. The first template (1), the second template (2), the third template (3) and the fourth template (4) are spliced ​​together in sequence to form a mold body in the form of flat casting and vertical pouring. The position of the gating gate is changed to the intersection area of ​​the tooth head of the workpiece to be formed and the plane. At the same time, the gating gate (5) is supplemented and the gating gate neck parameters are adjusted to ensure that the feeding channel for the tooth part in the mold body is opened. S2. The direct heating sleeve (6), the first sand-coated pouring cup (7), the filter structure (8) and the second sand-coated pouring cup (9) are spliced ​​and fixed from bottom to top to form an independent pouring structure and connect it with the riser and gating (5) to complete the assembly work. S3. The two first clamping plates (10) and the first fastener installed between the two first clamping plates (10) are assembled into a clamp and installed outside the mold body to clamp and stabilize the mold body. S4. Casting operations are carried out inside the mold body through the gating structure, and the carbon equivalent of the casting should be controlled at C%: 3.75±0.05%, Si%: 2.4±0.05%, CE%=C%+1 / 3Si%, CE%: 4.6±0.05%, and the casting temperature is limited to 1350-1410℃.

3. A mold for casting a planetary carrier, comprising a mold body, characterized in that: The mold body includes a first template (1), a second template (2), a third template (3), and a fourth template (4). The first template (1), the second template (2), the third template (3), and the fourth template (4) are sequentially spliced ​​to form a mold body in the form of flat casting and vertical casting. A forming space is provided inside the mold body. The top of the first template (1) is provided with a gating gate (5) that communicates with the forming space. The top of the gating gate (5) is provided with a gating structure. The gating structure includes a direct heating sleeve (6), a first sand-coated gating cup (7), a filter structure (8), and a second sand-coated gating cup (9). The direct heating sleeve (6), the first sand-coated gating cup (7), the filter structure (8), and the second sand-coated gating cup (9) are sequentially spliced ​​and fixed from bottom to top. A clamp is fitted on the outside of the mold body. The filter structure (8) is specifically a ceramic filter screen. The gating gate (5) is specifically set as a semi-cylindrical riser and is located in the intersection area of ​​the tooth head of the molded workpiece and the plane inside the subsequent casting mold body. The clamp consists of a second clamping plate (12), a third clamping plate (13), and a second fastener installed between the second clamping plate (12) and the third clamping plate (13). The front and rear ends of the second clamping plate (12) and the front and rear ends of the third clamping plate (13) are provided with clearance holes. The second fastener includes a long screw (14) and a first limiting nut (15) threaded to the surfaces of the two ends of the long screw (14). The two ends of the long screw (14) are respectively fitted into two clearance holes in adjacent positions. The two first limiting nuts (15) are respectively threaded to the surfaces of the ends of the long screw (14) and respectively fit against the side of the second clamping plate (12) and the side of the third clamping plate (13). In use, the first template (1), the second template (2), the third template (3) and the fourth template (4) are assembled together in sequence to form the mold body. Then, the second clamping plate (12) and the third clamping plate (13) are placed on the outside of the fourth template (4) and the outside of the first template (1) respectively and aligned.

4. The mold for casting a planetary carrier according to claim 3, characterized in that: The front and rear ends of the second clamping plate (12) and the front and rear ends of the third clamping plate (13) are provided with threaded holes. The threaded holes on the second clamping plate (12) are connected to the relief holes inside the plate. The threaded holes on the third clamping plate (13) are connected to the relief holes inside the plate. An auxiliary positioning screw (18) is threadedly connected inside the threaded hole to press and limit the long screw (14) fitted inside the relief hole.

5. A mold for casting a planetary carrier according to claim 4, characterized in that: The second clamping plate (12) has a mounting hole in the middle, and a support frame plate (16) is fixedly nested in the mounting hole. An adjustment space is formed between the surface of the support frame plate (16) and the inner wall of the mounting hole. A top pressure transmission assembly (17) is provided on one side of the support frame plate (16). The top pressure transmission assembly (17) includes several L-shaped pressure plates (171) and a support screw (172). Several L-shaped pressure plates (171) are installed on the surface of the support frame plate (16) along the circumference of the mounting hole. One end of the L-shaped pressure plate (171) passes through the adjustment space and extends to the outside of the fourth template (4). Two L-shaped pressure plates (171) in opposite positions can clamp and center the fourth template (4) with the center of the support frame plate (16) as a reference.

6. A mold for casting a planetary carrier according to claim 5, characterized in that: The other end of the L-shaped pressure plate (171) is fixed with an arc-shaped pressure block (175), the support screw (172) is fixed on the middle surface of the support frame plate (16), a folding spring sheet (177) is installed between the other end face of the L-shaped pressure plate (171) and the surface of the support screw (172), and a slide rail (176) fixed on one side of the support frame plate (16) is snapped into the inside of the L-shaped pressure plate (171).

7. A mold for casting a planetary carrier according to claim 6, characterized in that: The outer side of the support screw (172) is fitted with a linkage pressing assembly, which includes an inner threaded sleeve (173) and an outer pressure sleeve (174). The inner threaded sleeve (173) is fixedly nested in the middle inner side of the outer pressure sleeve (174) in a coaxial manner. The inner threaded sleeve (173) can be threadedly connected to the support screw (172). During the threaded connection between the inner threaded sleeve (173) and the support screw (172), the outer pressure sleeve (174) can simultaneously apply pressure to the arc-shaped pressure blocks (175) on the two L-shaped pressure plates (171) in opposite positions, so that the two L-shaped pressure plates (171) in opposite positions automatically clamp and center the fourth template (4). The long screw (14) has several detection holes (19) opened laterally along its own structure. Among the several detection holes (19), there are detection holes (19) that can be aligned with the second template (2), the third template (3), and the fourth template (4) respectively.

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