Die for casting electric drive axle and casting process

Abstract

The invention provides an electric drive axle casting mold and a casting technology.The electric drive axle casting mold comprises an upper mold and a lower mold which are oppositely arranged, an axle housing inner mold is arranged between the upper mold and the lower mold, an upper mold groove is formed in the lower end of the upper mold, and a lower mold groove is formed in the upper end of the lower mold; a connecting edge, a blocking edge and an inner supporting edge which are gradually thickened are outwards arranged on the front and rear edges of the middle part of the axle housing inner mold; outer supporting edges corresponding to the inner supporting edge in a sleeving manner are downwards arranged on the front and rear edges of the lower end of the upper mold; supporting frames are upwards arranged on the left side and the right side of the upper end of the upper die, negative pressure sliding grooves are formed in the supporting frames and penetrate through the upper die downwards, piston sliding blocks are connected to the negative pressure sliding grooves in a sealed and sliding mode, the lower ends of the piston sliding blocks are matched with the upper die grooves in shape, connecting sliding holes are formed in the upper portions of the supporting frames, and connecting sliding shafts are upwards arranged at the upper ends of the blocking discs. Integrated casting of the drive axle housing can be completed through the die, the production process of integrated casting of the drive axle housing is simplified, and the casting cost of the drive axle housing is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of integral casting, and relates to a mold and a casting process for an electric drive axle casting. Background Art

[0002] With the rapid development of the electric vehicle market, the requirements for the drive system are also constantly increasing. As one of the key components in the electric vehicle drive system, the performance of the electric drive axle directly affects the power performance, economy and reliability of the whole vehicle. As an important structural part for supporting and protecting the internal mechanical components of the electric drive axle, the drive axle housing of the electric drive axle not only needs to have high strength and high stiffness to withstand complex load conditions, but also needs to have good heat dissipation performance to ensure the stable operation of the electric drive system.

[0003] Traditional drive axle housings mostly adopt a split design and manufacturing method, that is, different parts are separately cast or forged and then connected together by welding or bolts. However, this manufacturing method is likely to cause a decrease in the strength of the joint and may increase the overall weight, which is not conducive to the development trend of vehicle lightweight. In view of this, the prior art proposes to design the drive axle housing as an integral structure in order to effectively improve its overall performance. The integral structure drive axle housing can reduce the weight while ensuring the strength, and further improve the working efficiency and service life of the whole electric drive axle.

[0004] However, there are many challenges in realizing the integral casting of the drive axle housing. Since the inside of the drive axle housing is a hollow structure, traditional molds cannot be directly used for integral molding. For this reason, the industry usually adopts the sand core method or the lost foam casting method to solve this problem. The sand core method is to use a sand core to form the inner cavity structure during the casting process, while the lost foam casting method is to first make a foam plastic model and embed it in the sand mold before casting, and the foam model gasifies and disappears when pouring the molten metal, thus leaving the required shape. Although these two methods can meet the requirements of integral casting to a certain extent, they also have obvious disadvantages: the process steps are cumbersome, the production cycle is long, and a set of sand cores or foam models need to be consumed for each product produced, resulting in the mold not being reusable, which increases the manufacturing cost. Summary of the Invention

[0005] The purpose of the present invention is to provide a mold and a casting process for an electric drive axle casting, which can complete the integral casting of the drive axle housing by the mold, simplify the production process of its integral casting and reduce its casting cost.

[0006] In order to solve the above technical problems, the present invention provides a casting mold for an electric drive axle, comprising an upper mold and a lower mold arranged relatively to each other, an inner mold of an axle housing having the same shape as the drive axle housing is arranged between the upper mold and the lower mold, an upper mold groove matching the shape of the inner mold of the axle housing is arranged at the lower end of the upper mold, a lower mold groove matching the shape of the inner mold of the axle housing is arranged at the upper end of the lower mold, a connecting edge, a blocking edge and an inner supporting edge with gradually thickening thickness are arranged outwardly on the front and rear sides of the middle part of the inner mold of the axle housing, an outer supporting edge corresponding to the inner supporting edge and sealedly connected to the outer supporting edge is arranged downwardly on the front and rear sides of the lower end of the upper mold, and end sealing strips connected to the ends of the two outer supporting edges are arranged downwardly on the left and right ends of the lower side of the upper mold;

[0007] Support frames are arranged upward on the left and right sides of the upper end of the upper die, and a negative pressure slide groove is provided in each support frame and penetrates downward through the upper die, and each negative pressure slide groove is sealed and slidably connected with a piston slider, and the lower end of each piston slider is a shape that matches the upper die groove, and the upper end of each piston slider is provided with a blocking disk with a cross-section larger than the corresponding negative pressure slide groove, and a connecting slide hole is provided on the top of each support frame, and each blocking disk is provided with a connecting slide shaft upward, and the upper end of each connecting slide shaft is provided with a hydraulic connecting disk through the corresponding connecting slide hole;

[0008] An upper riser connected to the upper mold groove is opened inwardly at the upper end of the middle part of the upper mold, side risers connected to the interior of the corresponding outer supporting edge are opened inwardly on both the front and rear sides of the middle part of the upper mold, and a lower riser connected to the lower mold groove is opened inwardly on the side of the lower mold. The upper mold is divided into two upper half molds that can be separated outwardly from the middle, and the lower mold is divided into two lower half molds that can be separated outwardly from the middle.

[0009] The present invention is further configured such that the thickness of each outer supporting edge and each end sealing strip is equal to the thickness of the inner supporting edge.

[0010] The present invention is further configured such that a limiting support sleeve is provided upwardly on the upper end of each blocking plate, and when the blocking plate contacts the upper end of the upper mold, the lower side of the piston slider seamlessly transitions with the upper mold groove, and when the upper end of the limiting support sleeve contacts the top inside the support frame, the piston slider does not fall out of the negative pressure slide groove.

[0011] The present invention is further configured such that a hydraulic support rod is provided between the inner top of each support frame and the corresponding blocking plate.

[0012] The present invention is further configured such that each support frame is in a U-shape with an opening downward.

[0013] The present invention is further configured such that the two upper half - molds are connected by upper hydraulic cylinders located on the front and rear sides. On both the front and rear sides of each upper half - mold, upper connecting plates connected to the corresponding upper hydraulic cylinders are provided outward. The two lower half - molds are connected by lower hydraulic cylinders located on the front and rear sides. On both the front and rear sides of each lower half - mold, lower connecting plates connected to the corresponding lower hydraulic cylinders are provided outward.

[0014] The present invention is further configured such that an upper exhaust hole communicating with the upper mold cavity is opened downward at the upper end of the lower mold. A side exhaust hole passing through the outer support edge is opened downward at the upper end of the upper mold. A lower exhaust hole communicating with the lower mold cavity is opened inward at the upper part of the lower mold.

[0015] The present invention is further configured such that the two upper half - molds divide the upper riser and each side riser into two equal parts, and the two lower half - molds divide the lower riser into two equal parts.

[0016] The present invention also discloses an electric drive axle casting process, which includes the following steps:

[0017] Step 1: Place the inner mold of the axle housing on the upper mold, cover the upper mold on the upper end of the inner mold of the axle housing, so that the inner mold of the axle housing is located between the upper mold cavity and the lower mold cavity, and the outer support edge sleeves the inner support edge, and tightly press the upper mold on the upper end of the lower mold through the hydraulic system;

[0018] Step 2: Pour molten iron into the upper mold cavity from the upper riser, pour molten iron into the lower mold cavity from the lower riser, and the molten iron finally flows into the gap between the blocking edge and the inner mold of the axle housing;

[0019] Step 3: After the molten iron in the upper mold cavity cools and solidifies to form an upper casting, and the molten iron in the lower mold cavity cools and solidifies to form a lower casting, the edges of the upper casting and the lower casting are splicing edges extending into the gap between the blocking edge and the inner mold of the axle housing;

[0020] Step 4: Pull the connecting sliding shaft upward through the hydraulic system. The piston slider moves upward to generate negative pressure in the negative pressure chute to suck the upper casting. Continue to pull the connecting sliding shaft upward to drive the upper mold and the upper casting to rise together, and then take away the inner mold of the axle housing;

[0021] Step 5: Continue to push the connecting sliding shaft downward through the hydraulic system to press the upper mold, and the piston slider moves downward to make the upper casting fall off from the top of the upper mold cavity and contact the lower casting, so that the upper and lower splicing edges are joined;

[0022] Step 6: Pour molten iron from the side riser to gradually fill the gap between the splicing edge and the outer support edge;

[0023] Step 7: After the molten iron between the edges to be spliced and the outer support edge is cooled and solidified, the hydraulic system pulls up the connecting sliding shaft, pulling the upper mold upward, and then the drive axle housing formed by connecting the upper casting and the lower casting can be removed.

[0024] Further preferably, the molten iron is cast steel molten iron, the casting temperature in Step 2 and Step 6 is 1540 - 1560 °C, and the temperature after cooling in Step 3 is 400 - 500 °C.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] First, through the design of the upper mold, the lower mold, and the inner mold of the axle housing, combined with unique casting steps, the integrated manufacturing of the drive axle housing is realized. Compared with the traditional split design, the integrated structure can effectively improve the overall strength and stiffness of the drive axle housing, while reducing the weight, which helps to improve the overall performance and energy efficiency of electric vehicles.

[0027] Second, the use of a hydraulic system for operation, including controlling the movement of the piston slider to generate negative pressure to suck the casting, adjusting the connecting sliding shaft to separate the upper and lower molds, etc., makes the demolding process smoother, reduces defects caused by the casting being stuck, and improves production efficiency and the finished product rate.

[0028] Third, although the sand core method or the lost foam casting method can also achieve the integrated casting of the drive axle housing, this process avoids the disadvantage of non-reusable molds in these methods, reduces production costs, and the surface of the cast drive axle housing is smoother and has higher precision. Description of the Drawings

[0029] Figure 1 is the overall structure schematic diagram of the present invention;

[0030] Figure 2 used to show the bottom structure of the upper mold;

[0031] Figure 3 is the overall structure schematic diagram of the upper half mold;

[0032] Figure 4 used to show the negative pressure chute and the connecting slide hole;

[0033] Figure 5 used to show the connection between the piston slider and the connecting sliding shaft;

[0034] Figure 6 used to show the lower mold groove at the upper end of the lower mold;

[0035] Figure 7 is the overall structure schematic diagram of the inner mold of the axle housing.

[0036] Among them, 1. upper mold; 2. lower mold; 3. inner mold of axle housing; 4. upper mold groove; 5. lower mold groove; 6. connecting edge; 7. blocking edge; 8. inner support edge; 9. outer support edge; 10. end sealing strip; 11. support frame; 12. negative pressure chute; 13. piston slider; 14. blocking disc; 15. connecting sliding hole; 16. connecting sliding shaft; 17. hydraulic connection disc; 18. limit support sleeve; 19. hydraulic support rod; 20. upper riser; 21. side riser; 22. lower riser; 23. upper exhaust hole; 24. side exhaust hole; 25. lower exhaust hole; 26. upper hydraulic cylinder; 27. upper connecting plate; 28. lower hydraulic cylinder; 29. lower connecting plate. Specific embodiments

[0037] The following further details a mold for casting an electric drive axle and a casting process proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, only for the purpose of conveniently and clearly assisting in explaining the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar components.

[0038] Example 1, referring to Figure 1-7 , a mold for casting an electric drive axle, including an upper mold 1 and a lower mold 2 arranged opposite to each other. There is an inner mold 3 of the axle housing with the same shape as the drive axle housing between the upper mold 1 and the lower mold 2. A upper mold groove 4 matching the shape of the inner mold 3 of the axle housing is provided at the lower end of the upper mold 1. A lower mold groove 5 matching the shape of the inner mold 3 of the axle housing is provided at the upper end of the lower mold 2. On both the front and rear sides in the middle of the inner mold 3 of the axle housing, there are respectively arranged a connecting edge 6, a blocking edge 7 and an inner support edge 8 with gradually increasing thickness outwards. On both the front and rear sides at the lower end of the upper mold 1, there is respectively arranged an outer support edge 9 sleeved outside and hermetically connected to the corresponding inner support edge 8. At the left and right ends of the upper mold groove 4 at the lower end of the upper mold 1, there is respectively arranged an end sealing strip 10 connected to the ends of the two outer support edges 9. The thickness of each outer support edge 9 and each end sealing strip 10 is equal to the thickness of the inner support edge 8. Through the connection between the outer support edge 9 and the upper end of the lower mold groove 5, there are casting gaps between the inner mold 3 of the axle housing and the upper mold groove 4 and the lower mold groove 5.

[0039] On both the left and right sides of the upper end of the upper mold 1, a support frame 11 is upwardly provided. Each support frame 11 is in a U shape with an opening downward. Inside each support frame 11, a negative pressure chute 12 is downwardly penetrated through the upper mold 1. Each negative pressure chute 12 is hermetically slidably connected with a piston slider 13. The lower end of each piston slider 13 is in a shape matching the upper mold cavity 4, making the top of the upper mold cavity 4 smoother. On the upper end of each piston slider 13, a blocking disk 14 with a cross-section larger than the corresponding negative pressure chute 12 is provided. Above the corresponding piston slider 13 in each support frame 11, a connecting slide hole 15 is opened. On the upper end of each blocking disk 14, a connecting slide shaft 16 is upwardly provided. The upper end of each connecting slide shaft 16 passes through the corresponding connecting slide hole 15 and is provided with a hydraulic connection disk 17, and the hydraulic connection disk 17 is used to connect the hydraulic system. On the upper end of each blocking disk 14, a limit support sleeve 18 sleeving the corresponding connecting slide shaft 16 is upwardly provided in a circle. When the blocking disk 14 contacts the upper end of the upper mold 1, there is a seamless transition between the lower side of the piston slider 13 and the upper mold cavity 4. When the upper end of the limit support sleeve 18 contacts the top inside the support frame 11, the piston slider 13 does not come out of the negative pressure chute 12. Between the inner top of each support frame 11 and the corresponding blocking disk 14, two hydraulic support rods 19 are provided. When it is necessary to take out the cast drive axle housing, the piston slider 13 is pushed downward by the elongation of the hydraulic support rods 19 to cancel the negative pressure attracting the drive axle housing.

[0040] An upper riser 20 communicating with the upper mold cavity 4 is inwardly opened at the upper end of the middle part of the upper mold 1. On the front and rear sides of the middle part of the upper mold 1, a side riser 21 communicating with the inside of the corresponding outer support edge 9 is inwardly opened. A lower riser 22 communicating with the lower mold cavity 5 is inwardly opened on the side of the lower mold 2. Two upper exhaust holes 23 communicating with the upper mold cavity 4 are downwardly opened at the upper end of the lower mold 2. A plurality of side exhaust holes 24 passing through the outer support edge 9 are downwardly opened at the upper end of the upper mold 1. Two lower exhaust holes 25 communicating with the lower mold cavity 5 are inwardly opened at the upper part of the lower mold 2. The upper mold 1 is split into two separable upper half-molds from the middle. The two upper half-molds divide the upper riser 20 and each side riser 21 into two equal parts. The lower mold 2 is split into two separable lower half-molds from the middle. The two lower half-molds divide the lower riser 22 into two equal parts. The upper mold 1 and the lower mold 2 can both be split in half, which is convenient for demolding and taking out the cast drive axle housing. The two upper half-molds are connected by an upper hydraulic cylinder 26 located on the front and rear sides. On the front and rear sides of each upper half-mold, an upper connecting plate 27 connected to the corresponding upper hydraulic cylinder 26 is outwardly provided. The two lower half-molds are connected by a lower hydraulic cylinder 28 located on the front and rear sides. On the front and rear sides of each lower half-mold, a lower connecting plate 29 connected to the corresponding lower hydraulic cylinder 28 is outwardly provided.

[0041] Embodiment 2, an electric drive axle casting process, based on the mold for casting an electric drive axle in Embodiment 1, includes the following steps:

[0042] Step 1: Place the inner mold 3 of the axle housing on the upper mold 1, cover the upper mold 1 on the upper end of the inner mold 3 of the axle housing, so that the inner mold 3 of the axle housing is located between the upper mold groove 4 and the lower mold groove 5, and the outer support edge 9 sleeves the inner support edge 8, and tightly press the upper mold 1 on the upper end of the lower mold 2 through the hydraulic system;

[0043] Step 2: Pour the molten iron into the upper mold groove 4 from the upper riser 20, pour the molten iron into the lower mold groove 5 from the lower riser 22, and the molten iron finally flows into the gap between the blocking edge 7 and the inner mold 3 of the axle housing, and the casting temperature is 1540 - 1560 °C;

[0044] Step 3: After the molten iron in the upper mold groove 4 cools and solidifies to form the upper casting, and the molten iron in the lower mold groove 5 cools and solidifies to form the lower casting, the edges of the upper casting and the lower casting are splicing edges extending into the gap between the blocking edge 7 and the inner mold 3 of the axle housing, and the temperature after cooling is 400 - 500 °C;

[0045] Step 4: First, shorten the hydraulic support rod 19, make the piston slider 13 move upward to generate negative pressure in the negative pressure chute 12 to suck the upper casting, pull the connecting sliding shaft 16 upward through the hydraulic system, continue to pull the connecting sliding shaft 16 upward, drive the upper mold 1 and the upper casting to rise together, and then remove the inner mold 3 of the axle housing;

[0046] Step 5: Push the connecting sliding shaft 16 downward to press the upper mold 1 through the hydraulic system, and the piston slider 13 moves downward to make the upper casting fall off from the top of the upper mold groove 4 and contact the lower casting, so that the upper and lower splicing edges are connected;

[0047] Step 6: Pour the molten iron from the side riser 21, so that the molten iron gradually fills the gap between the splicing edge and the outer support edge 9, and the casting temperature is 1540 - 1560 °C;

[0048] Step 7: After the molten iron between the splicing edge and the outer support edge 9 cools and solidifies, fix the length of the hydraulic support rod 19 to prevent the piston slider 13 from moving upward to generate negative pressure to suck the drive axle housing, extend both the upper hydraulic cylinder 26 and the upper hydraulic cylinder 26, so that the upper mold 1 and the lower mold 2 are separated in half, prevent the casting at the riser from getting stuck and affecting demolding, and finally pull the connecting sliding shaft 16 upward through the hydraulic system, pull the upper mold 1 upward, and remove the drive axle housing formed by connecting the upper casting and the lower casting.

[0049] It should also be supplemented and explained that all "settings" and similar descriptive words in this application (especially in the specification) express that there is a connection relationship between two structures, but the specific means of connection between the two are not overly limited, and usually are conventional connection means, that is, it should be understood that such means are prior art and do not need to be elaborated too much. For example, "n is provided on m" only expresses that there is an n structure on the m structure, and whether the two are connected by welding, riveting, adhesive connection or integrally formed is within the protection scope of this application; another example is "y is rotatably provided on x", which only expresses that y and x can rotate relative to each other, and as for whether the two are rotatably connected by a bearing, or y directly passes through x and is rotatably connected to x, or other achievable ways, they are all within the protection scope of this application.

[0050] The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention based on the above disclosure are within the protection scope of the claims.

Claims

1. A mold for casting an electric drive axle, comprising an upper mold (1) and a lower mold (2) which are oppositely arranged, characterized in that, A bridge housing inner mold (3) having the same shape as the drive axle housing is provided between the upper mold and the lower mold. The lower end of the upper mold is provided with an upper mold groove (4) that matches the shape of the bridge housing inner mold. The upper end of the lower mold is provided with a lower mold groove (5) that matches the shape of the bridge housing inner mold. On both the front and rear sides of the middle part of the bridge housing inner mold, there are connecting edges (6), blocking edges (7), and inner support edges (8) that gradually increase in thickness outward. On both the front and rear sides of the lower end of the upper mold, there are outer support edges (9) that are sleeved on and hermetically connected to the corresponding inner support edges and extend downward. At both the left and right ends of the lower side of the upper mold, there are end sealing strips (10) that are connected to the ends of the two outer support edges and extend downward. On both the left and right sides of the upper end of the upper mold, there are support frames (11) that extend upward. Inside each support frame, a negative pressure chute (12) penetrates downward through the upper mold. Each negative pressure chute is hermetically and slidably connected to a piston slider (13). The lower end of each piston slider has a shape that matches the upper mold groove. The upper end of each piston slider is provided with a blocking disk (14) whose cross-section is larger than the corresponding negative pressure chute. Above each support frame, there is a connecting slide hole (15). Each blocking disk is provided with a connecting slide shaft (16) that extends upward. The upper end of each connecting slide shaft passes through the corresponding connecting slide hole and is provided with a hydraulic connection disk (17). An upper riser (20) that communicates with the upper mold groove is opened inward at the upper end of the middle part of the upper mold. Side risers (21) that communicate with the inside of the corresponding outer support edges are opened inward on both the front and rear sides of the middle part of the upper mold. A lower riser (22) that communicates with the lower mold groove is opened inward on the side of the lower mold. The upper mold is split into two separable upper half-molds from the middle. The lower mold is split into two separable lower half-molds from the middle.

2. The mold for casting an electric drive axle according to claim 1, characterized in that, The thickness of each outer support edge and each end sealing strip is equal to the thickness of the inner support edge.

3. The mold for casting an electric drive axle according to claim 1, characterized in that, An upper end of each blocking disk is provided with a limiting support sleeve (18). When the blocking disk contacts the upper end of the upper mold, the lower side of the piston slider has a seamless transition with the upper mold groove. When the upper end of the limiting support sleeve contacts the top inside the support frame, the piston slider does not come out of the negative pressure chute.

4. A mold for casting an electric drive axle according to claim 1, characterized in that A hydraulic support rod (19) is provided between the inner top of each support frame and the corresponding blocking disk.

5. The mold for casting an electric drive axle according to claim 1, characterized in that, Each support frame is in a U shape with an open bottom.

6. The mold for casting an electric drive axle according to claim 1, wherein The two upper half-molds are connected by upper hydraulic cylinders (26) located on the front and rear sides. On both the front and rear sides of each upper half-mold, there are upper connecting plates (27) that are connected to the corresponding upper hydraulic cylinders. The two lower half-molds are connected by lower hydraulic cylinders (28) located on the front and rear sides. On both the front and rear sides of each lower half-mold, there are lower connecting plates (29) that are connected to the corresponding lower hydraulic cylinders.

7. A mold for casting an electric drive axle according to claim 1, characterized in that, An upper exhaust hole (23) that communicates with the upper mold groove is opened downward at the upper end of the lower mold. A side exhaust hole (24) that passes through the outer support edge is opened downward at the upper end of the upper mold. A lower exhaust hole (25) that communicates with the lower mold groove is opened inward at the upper part of the lower mold.

8. A mold for casting an electric drive axle according to claim 1, characterized in that, Two upper half-molds divide the upper riser and each side riser into two equal parts, and two lower half-molds divide the lower riser into two equal parts.

9. An electric drive bridge casting process, using the mold for casting an electric drive bridge according to any one of claims 1-8, characterized in that, It includes the following steps: Step 1: Place the inner mold of the axle housing on the upper mold, cover the upper mold on the upper end of the inner mold of the axle housing, so that the inner mold of the axle housing is located between the upper mold groove and the lower mold groove, and the outer support edge sleeves the inner support edge, and tightly press the upper mold on the upper end of the lower mold through the hydraulic system; Step 2: Pour molten iron into the upper mold groove from the upper riser, and pour molten iron into the lower mold groove from the lower riser. The molten iron finally flows into the gap between the blocking edge and the inner mold of the axle housing; Step 3: After the molten iron in the upper mold groove cools and solidifies to form an upper casting, and the molten iron in the lower mold groove cools and solidifies to form a lower casting. The edges of the upper casting and the lower casting are splicing edges extending into the gap between the blocking edge and the inner mold of the axle housing; Step 4: Pull up the connecting sliding shaft through the hydraulic system. The piston slider moves upward to generate negative pressure in the negative pressure chute to suck the upper casting. Continue to pull up the connecting sliding shaft to drive the upper mold and the upper casting to rise together, and then take away the inner mold of the axle housing; Step 5: Push down the upper mold by continuing to push the connecting sliding shaft through the hydraulic system, and the piston slider moves downward to make the upper casting fall off from the top of the upper mold groove and contact the lower casting, so that the upper and lower splicing edges are joined; Step 6: Pour molten iron from the side riser to gradually fill the gap between the splicing edge and the outer support edge; Step 7: After the molten iron between the splicing edge and the outer support edge cools and solidifies, the hydraulic system pulls up the connecting sliding shaft, pulls the upper mold upward, and removes the drive axle housing formed by connecting the upper casting and the lower casting together.

10. A casting process for an electric drive axle according to claim 9, characterized in that, The molten iron is cast steel molten iron. The casting temperature in Step 2 and Step 6 is 1540 - 1560 °C, and the temperature after cooling in Step 3 is 400 - 500 °C.

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