Lost foam mould of motor casing

Abstract

The evanescent mode mold comprises a top mold, a middle mold and a bottom mold, the middle mold comprises a middle shell, a fixed core mold, a movable core mold and eight movable side molds, the fixed core mold is fixedly arranged in the center of the bottom of the middle shell, the movable core mold is coaxially and slidably arranged on the outer side of the fixed core mold in a sleeving mode, and the movable side molds are arranged on the bottom of the middle shell. The eight movable side molds are opened and closed in a sliding mode between the fixed core mold and the middle shell, a cavity formed by the eight movable side molds, the fixed core mold and the movable core molds is a forming cavity of the motor shell, and the fixed core mold is further movably connected with a movable core block. According to the evanescent mode mold of the motor shell, the eight movable side molds are driven by the push-pull air cylinder to be automatically opened and closed, the lifting air cylinder pushes the movable core mold to move upwards to eject a formed motor shell product, and the movable core block is used for forming an inner cavity of a junction box on the motor shell. The method is suitable for producing the motor shell with the radiating fins on the eight surfaces and the junction box at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of lost foam molds, in particular to a lost foam mold for a motor shell. Background Art

[0002] The lost foam mold is a tool that is widely used in industrial practice. Its principle is to form a shell mold, then pour plastic foam and other materials into the inside of the mold, and wait for cooling and molding to form a lost foam mold of the required specific shape. This plastic foam type model can also be further used for subsequent actual product processing and manufacturing.

[0003] The motor housing is produced using a lost foam mold. Traditional lost foam molds for motor housings are only used to produce motor housings with heat sinks on all sides, and no junction box is set on the outside of the motor housing. In order to meet the diverse needs of the market, the appearance of motor housing products has undergone tremendous changes. The existing motor housing is not only equipped with multiple heat sinks on all sides, but also multiple heat sinks on the four corners. In addition, a junction box is also integrally formed on the outside of the motor housing. However, the existing lost foam molds for motor housings can no longer meet the production of motor housings with heat sinks on the four corners and a junction box on the outside, which urgently requires a new type of lost foam mold for motor housings. Utility Model Content

[0004] In view of the above problems, the purpose of the utility model is to provide a lost foam mold for a motor housing to solve the problem that the existing lost foam mold for a motor housing can no longer meet the production requirements of a motor housing having heat sinks at the four corners and a junction box on the outside.

[0005] The utility model is achieved in this way:

[0006] A lost foam mold for a motor housing comprises a top mold, an intermediate mold and a bottom mold which are arranged in sequence from top to bottom along a vertical direction; the intermediate mold comprises an intermediate housing, a fixed core mold, a movable core mold and eight movable side molds distributed along the same circumferential direction; the fixed core mold is fixedly arranged at the center position of the bottom of the intermediate housing; the movable core mold is coaxially slidably sleeved on the outer side of the fixed core mold; the eight movable side molds are slidably opened and closed between the fixed core mold and the intermediate housing; the cavity formed by the eight movable side molds, the fixed core mold and the movable core mold is a molding cavity for the motor housing; and a movable core block is movably connected to the fixed core mold.

[0007] Furthermore, the middle shell is octagonal, and eight push-pull cylinders are fixedly arranged on the outer wall of the middle shell, and the movable end of each push-pull cylinder is fixedly connected to the corresponding movable side mold.

[0008] Furthermore, a plurality of lifting cylinders are fixedly provided at the bottom of the intermediate shell body, the plurality of lifting cylinders are vertically arranged upward, and the movable ends of the lifting cylinders are fixedly connected to the bottom of the movable core mold.

[0009] Furthermore, eight guide plates are fixedly provided on the top of the intermediate shell body, the guide plates are of a trapezoidal structure, and two sides of the guide plates are respectively abutted against corresponding movable side molds.

[0010] Furthermore, eight limiting protrusions are fixedly provided on the top of the bottom mold, and eight limiting holes are correspondingly opened on the bottom of the intermediate shell. Each limiting protrusion is inserted into the corresponding limiting hole, and one side surface of the limiting protrusion is in contact with the outer wall of the corresponding movable side mold.

[0011] Furthermore, the bottom mold and the intermediate shell are connected via a plurality of screws, and springs are sleeved on the outer sides of the screws.

[0012] Furthermore, the bottom of the movable core block is plugged and fixed to the top of the fixed core mold, and the movable core block includes a plurality of stacked movable blocks, and adjacent movable blocks are fixed by plugging.

[0013] Furthermore, an upper core block is protrudingly provided at the center of the bottom of the top mold, and the upper core block is a truncated cone structure.

[0014] Furthermore, the inner wall of the movable side mold is provided with a plurality of vertical ribs, and the outer wall of the movable side mold is fixedly connected to the movable end of the push-pull cylinder.

[0015] Furthermore, a plurality of top plates are provided on the top of the movable core mold and the bottom wall of the intermediate shell, and a bottom plate is correspondingly provided on the bottom of the movable side mold, and the bottom plate is in contact with the top plate.

[0016] The beneficial effects of the utility model are:

[0017] The utility model discloses a lost foam mold for a motor shell, wherein eight movable side molds are arranged to open and close the mold under the drive of a push-pull cylinder, and a lifting cylinder is arranged to push the movable core mold to eject the molded motor shell product when it moves upward; the movable core block is arranged to form the inner cavity of the junction box on the motor shell, and the eight movable side molds are convenient for demoulding of the mold, and the utility model is suitable for the production of a motor shell with heat sinks on eight sides and a junction box with an inner cavity at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model when the mold is closed;

[0019] Figure 2 It is an exploded view of the three-dimensional structure of the utility model;

[0020] Figure 3 It is a three-dimensional structural schematic diagram of some components of the intermediate mold, bottom mold and movable core block of the utility model;

[0021] Figure 4 It is a three-dimensional structural schematic diagram of some components of the intermediate mold and the movable core block of the utility model;

[0022] Figure 5 It is a three-dimensional structural schematic diagram of the top mold of the utility model;

[0023] Figure 6 It is a three-dimensional structural schematic diagram of the fixed core mold and the movable core block of the utility model;

[0024] Figure 7 It is a top view of the eight movable side molds of the utility model when the mold is closed;

[0025] Figure 8 It is a top view of the eight movable side molds of the utility model when the mold is opened.

[0026] Description of reference numerals:

[0027] 1. Top mold; 11. First positioning block; 12. Upper core block;

[0028] 2. Intermediate mold; 21. Intermediate shell; 211. Guide plate; 212. Second positioning block; 213. Limiting hole; 22. Fixed core mold; 23. Movable core mold; 231. Top plate; 24. Movable side mold; 241. Bottom plate; 25. Push-pull cylinder; 26. Lifting cylinder;

[0029] 3. Bottom mold; 31. Third positioning block; 32. Limiting convex block;

[0030] 4. Movable core block; 41. First movable block; 42. Second movable block; 43. Third movable block; 44. Fourth movable block; 45. Fifth movable block; 5. Screw rod; 6. Nut; 7. Spring; 8. Motor housing. DETAILED DESCRIPTION

[0031] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0032] like Figures 1 to 8The figure shows the lost foam mold of the motor housing of the utility model, including a top mold 1, an intermediate mold 2 and a bottom mold 3 arranged in sequence from top to bottom in the vertical direction, the intermediate mold 2 includes an intermediate shell 21, a fixed core mold 22, a movable core mold 23 and eight movable side molds 24 distributed along the same circumferential direction, the fixed core mold 22 is fixedly arranged at the center position of the bottom of the intermediate shell 21, the movable core mold 23 is coaxially slidably sleeved on the outer side of the fixed core mold 22, the eight movable side molds 24 slide and open and close between the fixed core mold 22 and the intermediate shell 21, the cavity formed by the eight movable side molds 24, the fixed core mold 22, the movable core mold 23 and the top mold 1 is the molding cavity of the motor shell 8, and the fixed core mold 22 is also movably connected to the movable core block 4.

[0033] like Figure 2 to Figure 4 As shown, the middle mold 2 includes an intermediate shell 21, a fixed core mold 22, a movable core mold 23 and eight movable side molds 24. The intermediate shell 21 is octagonal. Eight push-pull cylinders 25 are fixedly arranged on the outer wall of the intermediate shell 21. The movable ends of each push-pull cylinder 25 are fixedly connected to the corresponding movable side molds 24. The central axis enclosed by the eight movable side molds 24 is on the same straight line as the central axis of the fixed core mold 22. A plurality of lifting cylinders 26 are fixedly arranged at the bottom of the intermediate shell 21. The plurality of lifting cylinders 26 are vertically arranged upward. The movable ends of the lifting cylinders 26 are fixedly connected to the bottom of the movable core mold 23. In this embodiment, the number of the lifting cylinders 26 is four, and the four lifting cylinders 26 are evenly arranged along the circumferential direction of the intermediate shell 21. The movable core mold 23 is an annular structure. The movable core mold 23 is slidably sleeved on the outer side of the fixed core mold 22. The lifting cylinders 26 are telescopic to drive the movable core mold 23 fixedly connected to its movable end to move up and down in the vertical direction. Preferably, the fixed core mold 22 is a truncated cone structure, which facilitates the flexible movement of the movable core mold 23 sleeved on its outer side. The push-pull cylinder 25 is actuated to drive the movable side mold 24 fixedly connected to its movable end to move back and forth, and the moving direction of the movable side mold 24 is along the radial direction of the fixed core mold 22. Eight guide plates 211 are fixedly provided on the top of the intermediate shell 21. The guide plates 211 are trapezoidal structures. The two sides of the guide plates 211 are respectively abutted against the two side surfaces of the corresponding movable side molds 24 to play a guiding role, so that the movable side mold 24 moves along a fixed motion trajectory. The inner wall of the movable side mold 24 is provided with a plurality of vertical ribs, and the plurality of vertical ribs are mutually enclosed to form the heat sink of the motor housing 8. The outer wall of the movable side mold 24 is fixedly connected to the movable end of the push-pull cylinder 25, and the push-pull cylinder 25 is actuated to drive the movable side mold 24 to move back and forth.

[0034] like Figure 5As shown, the top mold 1 is also octagonal in shape. The top mold 1 covers the top of the intermediate shell 21. A plurality of first positioning blocks 11 are provided on the outer periphery of the top mold 1. A positioning groove is provided on one side of the first positioning block 11 close to the outer periphery of the top mold 1. A plurality of second positioning blocks 212 are provided on the upper part of the outer periphery of the intermediate shell 21. The plurality of second positioning blocks 212 are arranged corresponding to the first positioning blocks 11, and the second positioning blocks 212 are respectively clamped in the positioning grooves of the corresponding first positioning blocks 11 to achieve precise positioning between the intermediate shell 21 and the top mold 1. An upper core block 12 is convexly provided at the center position of the bottom of the top mold 1. The upper core block 12 is a truncated cone structure, and the diameter of the upper core block 12 gradually decreases from top to bottom. When the top mold 1 covers the top of the intermediate shell 21, the bottom of the upper core block 12 contacts the top of the fixed core mold 22. A plurality of second positioning blocks 212 are also provided at the lower part of the outer periphery of the intermediate shell 21, and a plurality of third positioning blocks 31 are provided at the outer periphery of the bottom mold 3. The third positioning blocks 31 have the same shape and size as the first positioning blocks 11. The second positioning blocks 212 provided at the lower part of the outer periphery of the intermediate shell 21 are provided correspondingly to the third positioning blocks 31, and the second positioning blocks 212 are respectively clamped in the positioning grooves of the corresponding third positioning blocks 31 to achieve precise positioning between the intermediate shell 21 and the bottom mold 3.

[0035] The fixed core mold 22 is fixedly arranged at the center of the bottom of the intermediate housing 21. The fixed core mold 22 is also movably connected with a movable core block 4. The bottom of the movable core block 4 is plugged and fixed to the top of the fixed core mold 22. The movable core block 4 includes a plurality of stacked movable blocks, and adjacent movable blocks are fixed by plugging. In this embodiment, Figure 6 As shown, the movable core block 4 includes a first movable block 41, a second movable block 42, a third movable block 43, a fourth movable block 44 and a fifth movable block 45 which are placed in sequence from bottom to top. The bottom of the first movable block 41 is plugged and fixed with the top of the fixed core mold 22. A conical groove is provided on the upper part of the first movable block 41. The second movable block 42 has a conical surface adapted to the conical groove, so that the first movable block 41 and the second movable block 42 are plugged and fixed through the conical surface and the conical groove, and the setting of the conical surface and the conical groove makes the mutual movement between the two more convenient and flexible. The third movable block 43 and the fourth movable block 44 are both provided with positioning grooves and positioning protrusions, and the second movable block 42 and the fifth movable block 45 are correspondingly provided with positioning grooves, so that the positions of adjacent movable blocks when inserted are more accurate, ensuring the reliability and stability of the connection between the movable blocks.

[0036] like Figure 1 to Figure 3As shown, eight limiting protrusions 32 are fixedly arranged on the top of the bottom mold 3, and eight limiting holes 213 are correspondingly opened at the bottom of the intermediate shell 21. Each limiting protrusion 32 is inserted into the corresponding limiting hole 213, and one side of the limiting protrusion 32 abuts against the outer wall of the corresponding movable side mold 24. The positions of the eight limiting protrusions 32 are respectively set corresponding to the eight movable side molds 24, and the eight movable side molds 24 are respectively limited to prevent the eight movable side molds 24 from pushing the movable side molds 24 outward due to the large internal air pressure when they are in the mold closing state, so as to ensure that the movable side molds 24 are in a tightly closed state when working. The bottom mold 3 and the intermediate shell 21 are connected by a plurality of screws 5 and nuts 6, and a spring 7 is sleeved on the outer side of the screw 5. When the bottom mold 3, the intermediate mold 2 and the top mold 1 are in the mold closing state, the spring 7 is compressed, and the bottom mold 3 and the intermediate shell 21 of the intermediate mold 2 are locked and fixed by the screws 5 and nuts 6, so that the bottom mold 3, the intermediate mold 2 and the top mold 1 are in a tightly combined state after the mold closing. When the mold needs to be opened, the top mold 1 is removed from the top of the middle mold 2, so that the nut 6 and the screw 5 are loosened, and the spring 7 is stretched and restored to its natural length under the action of elastic potential energy. The spring 7 pushes the upper middle mold 2 to move upward during the stretching process. At this time, there is a certain gap between the middle mold 2 and the bottom mold 3 in the vertical direction. At the same time, the bottom of the movable side mold 24 is higher than the top of the limiting protrusion 32, and the limiting protrusion 32 no longer limits the movable side mold 24, and the movable side mold 24 can move freely along its movement trajectory. A plurality of top plates 231 are provided on the top of the movable core mold 23 and the bottom wall of the intermediate shell 21, and a bottom plate 241 is correspondingly provided at the bottom of the movable side mold 24, and the bottom plate 241 is abutted against the top plate 231. Specifically, two bottom plates 241 are fixedly provided at the bottom of each movable side mold 24, and the size and position of the bottom plate 241 are set corresponding to the top plate 231. When the movable side mold 24 moves, the bottom plate 241 thereof moves along the top of the movable core mold 23 and the top plate 231 on the intermediate shell 21, and the bottom of the bottom plate 241 contacts and rubs with the top of the top plate 231. Both the top plate 231 and the bottom plate 241 are made of copper plates, which have wear-resistant properties and greatly reduce the wear of the movable side mold 24 during repeated opening and closing, thereby increasing the service life of the mold.

[0037] The lost foam mold of the motor housing of the utility model is before the mold is closed, such as Figure 8As shown in the figure, the eight movable side molds 24 are in the mold opening state, there is a certain gap between the intermediate shell 21 and the bottom mold 3, the bottom of the movable side mold 24 is higher than the top of the limiting protrusion 32, the lifting cylinder 26 is in the natural state and the movable core mold 23 is at the bottom, the bottom of the movable core mold 23 is in contact with the bottom of the inner wall of the intermediate shell 21, the assembled movable core block 4 is installed on the top of the fixed core mold 22, and each push-pull cylinder 25 is started. The eight push-pull cylinders 25 respectively drive the movable side molds 24 fixedly connected thereto to move inward to each other After the mold is closed, the top mold 1 is placed on the top of the middle mold 2. The top mold 1 and the middle mold 2 move downward at the same time under the effect of increased weight. The spring 7 between the middle mold 2 and the bottom mold 3 is compressed until the middle mold 2, the bottom mold 3 and the top mold 1 are tightly combined without gaps. At this time, the bottom of the movable side mold 24 is lower than the top of the limiting protrusion 32. The side of the limiting protrusion 32 contacts and resists the side wall of the movable side mold 24 to limit the outward movement of the movable side mold 24. Finally, the nut 6 and the screw 5 are tightened to complete the mold closing. The mold closing state of the eight movable side molds 24 is as follows: Figure 7 As shown. When the mold needs to be opened, first remove the top mold 1 from the top of the middle mold 2, then loosen the nut 6 connecting the middle mold 2 and the bottom mold 3, and the spring 7 returns to its natural length while pushing the middle mold 2 upward. There is a certain distance between the middle mold 2 and the bottom mold 3, and the bottom of the movable side mold 24 on the middle mold 2 is higher than the top of the limiting protrusion 32. Start the push-pull cylinder 25, so that the eight push-pull cylinders 25 respectively drive their respective movable side molds 24 to move outward for a certain distance, and the eight movable side molds 24 are no longer in contact with each other and are separated from the outer wall of the formed motor housing 8. Then start the lifting cylinder 26, the lifting cylinder 26 is extended, and the movable core mold 23 is pushed upward to drive the motor housing 8 formed on the movable core mold 23 to move upward, and separate the inner wall of the motor housing 8 from the outer wall of the fixed core mold 22. Then take out the formed motor housing 8, and manually take out the multiple movable blocks in the cavity of its junction box to complete the demolding of the mold.

[0038] Although the present invention discloses a preferred specific embodiment to achieve the above-mentioned purpose, it is not intended to limit the structural features of the present invention. Any person skilled in the art should know that under the technical spirit of the present invention, any easily conceivable changes or modifications are possible and are all covered by the scope of the patent application of the present invention.

Claims

1. A lost foam mold for a motor housing, characterized in that: The invention comprises a top mold (1), a middle mold (2) and a bottom mold (3) which are arranged in sequence from top to bottom in a vertical direction. The middle mold (2) comprises an intermediate shell (21), a fixed core mold (22), a movable core mold (23) and eight movable side molds (24) distributed along the same circumferential direction. The fixed core mold (22) is fixedly arranged at the center position of the bottom of the intermediate shell (21). The movable core mold (23) is coaxially slidably sleeved on the outer side of the fixed core mold (22). The eight movable side molds (24) are slidably opened and closed between the fixed core mold (22) and the intermediate shell (21). The cavity formed by the eight movable side molds (24), the fixed core mold (22) and the movable core mold (23) is a molding cavity of the motor shell (8). The fixed core mold (22) is also movably connected to a movable core block (4).

2. The lost foam mold of the motor housing according to claim 1, characterized in that: The intermediate shell (21) is octagonal, and eight push-pull cylinders (25) are fixedly disposed on the outer wall of the intermediate shell (21), and the movable end of each push-pull cylinder (25) is fixedly connected to the corresponding movable side mold (24).

3. The lost foam mold of the motor housing according to claim 1 or 2, characterized in that: A plurality of lifting cylinders (26) are fixedly arranged at the bottom of the intermediate shell (21), and the plurality of lifting cylinders (26) are arranged vertically upwards, and the movable ends of the lifting cylinders (26) are fixedly connected to the bottom of the movable core mold (23).

4. The lost foam mold for a motor housing according to any one of claims 1 or 2, characterized in that: Eight guide plates (211) are fixedly provided on the top of the intermediate shell (21), the guide plates (211) being of a trapezoidal structure, and two sides of the guide plates (211) are respectively in contact with corresponding movable side molds (24).

5. The lost foam mold of the motor housing according to claim 1, characterized in that: Eight limiting protrusions (32) are fixedly provided on the top of the bottom mold (3), and eight limiting holes (213) are correspondingly opened on the bottom of the intermediate shell (21). Each limiting protrusion (32) is inserted into a corresponding limiting hole (213), and a side surface of the limiting protrusion (32) abuts against an outer wall of a corresponding movable side mold (24).

6. The lost foam mold of the motor housing according to claim 1, characterized in that: The bottom mold (3) and the intermediate housing (21) are connected via a plurality of screw rods (5), and springs (7) are sleeved on the outer sides of the screw rods (5).

7. The lost foam mold of the motor housing according to claim 1 or 2, characterized in that: The bottom of the movable core block (4) is plugged and fixed to the top of the fixed core mold (22); the movable core block (4) comprises a plurality of stacked movable blocks, and adjacent movable blocks are fixed by plugging.

8. The lost foam mold of the motor housing according to claim 1 or 2, characterized in that: An upper core block (12) is protrudingly provided at the center of the bottom of the top mold (1), and the upper core block (12) is a truncated cone structure.

9. The lost foam mold of the motor housing according to claim 2, characterized in that: The inner wall of the movable side mold (24) is provided with a plurality of vertical ribs, and the outer wall of the movable side mold (24) is fixedly connected to the movable end of the push-pull cylinder (25).

10. The lost foam mold of the motor housing according to claim 1 or 2, characterized in that: A plurality of top plates (231) are provided on the top of the movable core mold (23) and the bottom wall of the intermediate shell (21), and a bottom plate (241) is correspondingly provided at the bottom of the movable side mold (24), and the bottom plate (241) is in contact with the top plate (231).

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