Stamping die for side wall notch of automobile motor shell

Abstract

The utility model relates to automobile parts technology, concretely relates to the processing of automobile motor casing, especially a kind of stamping die of automobile motor casing side wall notch. The stamping die of automobile motor casing side wall notch includes upper die assembly and lower die assembly, and the lower die assembly is connected with the cutting recess die matched with casing, the side wall of cutting recess die is provided with recess, and the two side edges of recess are blade edge;The bottom of upper die assembly is movably connected with cutting punch, cutting punch can be extended into recess and form shearing fit with blade edge, and upper die assembly is provided with elastic pressing part on the side of cutting punch;The lower die assembly further includes lower stopper on the side of cutting recess die, and the side surface of lower stopper towards cutting recess die is provided with inclined plane.The motor casing side wall large notch is once stamping forming, avoids the positioning error and process gap problem of traditional multiple stamping, improves production efficiency;At the same time, reduce stamping procedure, reduce scrap rate.

Description

Technical Field

[0001] This utility model relates to automotive parts technology, specifically to the processing of automotive motor housings, and in particular to a stamping die for a notch in the side wall of an automotive motor housing. Background Technology

[0002] like Figure 1 The automotive motor housing shown has a large notch (point A in the figure) on its side wall that completely penetrates the top of the housing for mounting the wiring harness of the motor frame. There are two methods for manufacturing this large notch:

[0003] The first method involves two stamping processes: one for stamping the top notch of the housing and the other for stamping the sidewall notch. This method introduces positioning errors, and a stamping process notch needs to be created between the top and sidewall notches. Due to the large area of ​​the sidewall notch, an inside-out stamping die structure is required. Furthermore, the rounded corners at the top of the housing cannot fully align with the die edge during stamping, easily resulting in stamping burrs and inconsistent housing quality. Simultaneously, the two stamping processes increase production costs, reduce the product's cost-effectiveness, and consequently decrease the motor's market competitiveness.

[0004] The second method uses a one-time stamping process. The mold structure adopts a stamping die and an inclined structure for the motor housing. The stamping punch moves up and down relative to the cutting edge area of ​​the die. During the process of the stamping punch applying a straight punching force to the motor housing material, the back punching force of the motor housing material itself is too large. After the notch stamping is completed, the elasticity of the material causes the notch size of the motor side wall to increase. The larger the notch area, the greater the elasticity of the material, and the more unstable the notch size of the motor housing. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to solve the problems of large positioning error and many burrs in the manufacturing of large notches on the side wall of motor housing in the above-mentioned background art, or large springback and unstable dimensions of material in a single stamping, a stamping die for the side wall notch of automotive motor housing is provided, which realizes the one-time stamping forming of large notches on the side wall, avoids the positioning error of traditional stamping in multiple stages, and at the same time reduces material springback and improves the dimensional stability of the notch by elastic clamping and rotary blanking.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a stamping die for a notch in the side wall of an automotive motor housing, comprising an upper die assembly and a lower die assembly.

[0007] The lower mold assembly is connected to a cutting die that mates with the housing. The sidewall of the cutting die has a groove, and the two sides of the groove are cutting edges.

[0008] The bottom of the upper mold assembly is movably connected to a cutting punch, which can extend into the groove and form a shearing engagement with the cutting edge. The upper mold assembly is provided with an elastic clamping element on one side of the cutting punch.

[0009] The lower die assembly also includes a lower stop block located on one side of the cutting die, and the lower stop block has an inclined surface on one side facing the cutting die.

[0010] The cutting die has grooves and cutting edges on its sidewalls to work with the cutting punch to shear the material on the sidewalls of the housing, ensuring clean cut edges and avoiding burrs. The cutting punch is connected to a movable joint, allowing it to adjust its angle adaptively during stamping, preventing material deformation or springback caused by rigid stamping. The elastic clamping element applies continuous pressure during stamping to prevent housing displacement and improve stamping accuracy. The inclined surface of the lower stop guides the movement trajectory of the cutting punch, ensuring stable rotation during stamping, reducing the impact of lateral forces on the die, and extending die life.

[0011] According to one embodiment of the present invention, the lower surface of the cutting die is an inclined plane, which, after being fixed, makes the upper surface of the shell form an angle of 5° to 30° with the horizontal plane.

[0012] The shell is tilted to optimize the punching angle, allowing the cutting punch to cut into the material at a better angle, reducing punching resistance, avoiding material springback caused by direct punching, and improving the accuracy of the notch size.

[0013] According to one embodiment of the present invention, the bottom surface of the elastic clamping member is provided with an inclined surface that matches the inclined surface of the upper surface of the housing.

[0014] Matching the inclined surface of the shell ensures uniform distribution of clamping force, prevents the shell from warping or shifting during punching, improves punching stability, and reduces cut deformation caused by uneven force.

[0015] According to one embodiment of the present invention, the elastic clamping member is made of polyurethane rubber.

[0016] Polyurethane rubber possesses high elasticity and wear resistance, enabling it to maintain stable clamping force over a long period and preventing clamping failure caused by metal fatigue. Compared to ordinary rubber, it has stronger resistance to compression deformation, ensuring that the housing remains stably fitted to the die during the stamping process.

[0017] According to one embodiment of the present invention, the lower part of the lower stop block is provided with a groove for part of the cutting die to extend into.

[0018] The cutting die extends into the slot, enhancing the structural stability of the lower stop and preventing it from deforming under stress during punching. At the same time, it ensures the precise movement trajectory of the cutting punch and avoids punching deviations caused by loosening of the lower stop.

[0019] According to one embodiment of the present invention, the lower part of the side of the lower stop block facing the cutting die is a straight surface with a groove, and the upper part is an inclined surface.

[0020] The upper inclined surface guides the rotation of the cutting punch, allowing it to smoothly enter the blanking position; the lower straight surface provides rigid support after blanking, counteracting the material reaction force and preventing the cutting punch from springing back.

[0021] According to one embodiment of the present invention, both the cutting die and the housing are provided with positioning pin mounting holes.

[0022] Ensure precise positioning of the housing to avoid deviation in the cut position due to housing offset during stamping, thereby improving the consistency of batch production and reducing the scrap rate.

[0023] According to one embodiment of the present invention, the upper end of the cutting punch is provided with a rotating shaft hole, and the lower part of the side facing the elastic clamping member is provided with a cutting edge, and the opposite side is a vertical surface, which is connected to the bottom surface by a rounded transition.

[0024] The rotating shaft hole facilitates hinge connection, allowing the cutting punch to adaptively adjust its angle; the cutting edge directly participates in shearing, ensuring a smooth cut edge; the vertical surface provides rigid support, and the rounded corner transition reduces stress concentration and improves mold life.

[0025] According to one embodiment of the present invention, the upper mold assembly includes an upper mold base, an upper pad, and an upper fixing plate connected sequentially from top to bottom. The cutting punch is hinged to the upper fixing plate by a pin passing through a rotating shaft hole, and the elastic clamping member is connected to the upper fixing plate by screws.

[0026] The three-layer structure of the upper die holder, upper backing plate, and upper fixing plate enhances rigidity, disperses punching force, and prevents die deformation; the pin hinge ensures that the cutting punch can rotate flexibly to adapt to different punching angles; the screw fixation of the elastic clamping parts facilitates replacement and maintenance.

[0027] According to one embodiment of the present invention, the lower mold assembly includes a lower mold base and a lower fixing plate connected sequentially from bottom to top, and the cutting die and the lower stop block are both fixed to the lower fixing plate by bolts.

[0028] The lower die base and lower fixed plate provide stable support to ensure that the die does not shift during the punching process; the bolts fix the cutting die and the lower stop block, which facilitates disassembly and maintenance, while ensuring the positioning accuracy of the cutting die and the lower stop block.

[0029] The beneficial effects of this utility model are:

[0030] (1) The motor housing sidewall of this utility model is formed by one-time stamping with a large notch, which avoids the positioning error and process gap problem of traditional stamping in multiple stages, and improves production efficiency; at the same time, it reduces the stamping process and reduces the scrap rate.

[0031] (2) By using rotary punching and elastic clamping, material springback is suppressed to ensure stable notch size;

[0032] (3) The cutting edges are precisely matched to reduce burrs and meet the assembly requirements of high-precision motor housings;

[0033] (3) The inclined plane and elastic structure buffer the punching force and reduce die wear;

[0034] (4) Layered mold base and positioning structure to ensure consistency in mass production. Attached Figure Description

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] Figure 1 This is a schematic diagram of the structure of the motor housing to be processed according to this utility model.

[0037] Figure 2 This is a schematic diagram of the structure of this utility model.

[0038] Figure 3 This is a schematic diagram of the cutting die in this utility model.

[0039] Figure 4 yes Figure 3 A schematic diagram of the structure from another direction.

[0040] Figure 5 This is a schematic diagram of the cutting punch in this utility model.

[0041] Figure 6 This is a schematic diagram of the structure of the lower stop block in this utility model.

[0042] Figure 7 This is a schematic diagram of the structure of this utility model in its open state.

[0043] Figure 8 This is a schematic diagram of the structure of this utility model in a semi-closed state.

[0044] Figure 9 This is a schematic diagram of the structure of this utility model in its fully closed state.

[0045] In the diagram: 1. Upper mold base; 2. Upper backing plate; 3. Upper fixing plate; 4. Lower mold base; 5. Lower fixing plate; 6. Cutting punch; 61. Rotating shaft hole; 62. Vertical surface; 63. Rounded corner; 64. Cutting edge; 7. Elastic clamping element; 8. Cutting die; 81. Groove; 82. Cutting edge; 83. Positioning pin mounting hole; 9. Lower stop block; 91. Slot; 92. Straight surface; 10. Housing; 11. Pin; 12. Positioning pin. Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0047] like Figures 2-7 As shown, a stamping die for a side wall notch of an automotive motor housing includes an upper die assembly and a lower die assembly. The upper die assembly includes an upper die base 1, an upper pad 2, and an upper fixing plate 3 connected sequentially from top to bottom. The lower die assembly includes a lower die base 4 and a lower fixing plate 5 connected sequentially from bottom to top. A cutting punch 6 is hinged to the upper fixing plate 3 by a pin 11. An elastic clamping member 7 is provided on one side of the cutting punch 6. The elastic clamping member 7 is connected to the upper fixing plate 3 by screws. A cutting die 8 that mates with the housing 10 is connected to the lower fixing plate 5 by bolts. A groove 81 is provided on the side wall of the cutting die 8. The two sides of the groove 81 are cutting edges 82. The cutting punch 6 can extend into the groove 81 and form a shearing engagement with the cutting edges 82. A lower stop block 9 located on one side of the cutting die 8 is also connected to the lower fixing plate 5 by bolts. The side of the lower stop block 9 facing the cutting die 8 has an inclined surface.

[0048] like Figure 3 and Figure 4 As shown, the lower surface of the cutting die 8 is an inclined plane, which, after being fixed, causes the upper surface of the housing 10 to form an angle α of 5° to 30° with the horizontal plane. The cutting die 8 has positioning pin mounting holes 83, and the housing 10 also has corresponding positioning pin mounting holes. Combined with... Figure 2 The bottom surface of the elastic clamping member 7 is provided with an inclined surface that matches the inclined surface of the upper surface of the housing 10. The material of the elastic clamping member 7 is preferably polyurethane rubber.

[0049] like Figure 5 As shown, the upper end of the cutting punch 6 is provided with a rotating shaft hole 61, and the lower part of the side facing the elastic clamping member 7 is provided with a cutting edge 64. The opposite side is a vertical surface 62, which is connected to the bottom surface by a rounded corner 63.

[0050] like Figure 6 As shown, the lower stop block 9 has a slot 91 at its lower part, into which part of the cutting die 8 extends. The lower part of the side of the lower stop block 9 facing the cutting die 8 is a straight surface 92 with a slot 91, and its upper part is a slope.

[0051] The specific work process is as follows:

[0052] like Figure 7 As shown, when the stamping die of this embodiment is in the open state, the housing 10 is fixed on the cutting die 8 with the positioning pin 12. The upper die assembly is pressed down, and the cutting edge 64 of the cutting punch 6 first contacts the side wall of the housing 10. After the cutting edge 64 of the cutting punch 6 contacts the side wall of the housing 10, it rotates outward along the axis of the pin 11 until the rounded corner 63 of the cutting punch 6 contacts the inclined surface of the lower stop block 9. At this time, the inclined surface of the elastic clamping member 7 abuts against the upper surface of the housing 10.

[0053] like Figure 8 As shown, the upper die assembly continues to move downwards, and the rounded corner 63 of the cutting punch 6 rotates along the inclined surface of the lower stop 9 and toward the housing 10 along the axis of the pin 11. The cutting edge 64 of the cutting punch 6 shears the side wall of the housing 10. After the rounded corner 63 of the cutting punch 6 finishes moving along the inclined surface of the lower stop 9, the straight surface 92 of the lower stop 9 cancels the reverse pushing force generated by the side wall material of the housing 10 on the cutting punch 6 during the shearing process. During the downward pressing of the upper die assembly, due to the good compressibility of the elastic clamping member 7, its inclined surface always abuts against the upper surface of the housing 10, and the housing 10 is stably pressed onto the cutting die 8.

[0054] like Figure 9 As shown, when the upper mold assembly is pressed down to the set position, the cutting punch 6 cuts through the shell 10 and enters the groove 81 of the cutting die 8. The upper mold assembly and the lower mold assembly reach a closed state, and the cutting waste falls downward into the waste outlet.

[0055] After the stamping is completed, the upper die assembly rises, the cutting punch 6 leaves the cutting die 8, the elastic clamping part 7 returns to its initial state, and finally, the shell 10 with the cut completed is taken out.

[0056] In this embodiment, the stamping die completes a large-area notch from the side wall to the top surface of the motor housing 10 in a single stamping operation, avoiding quality problems such as burrs caused by positioning errors in the secondary stamping process. The cutting edge 64 of the cutting punch 6 cooperates with the lower stop 9 to perform a "shearing then stamping" action on the material of the side wall of the housing 10, avoiding the situation where the punching force on the housing material is too large due to the vertical punching of the punch and die in conventional stamping, and the notch size becomes larger and the quality of the housing 10 is unstable due to the springback of the material after the notch stamping is completed. The stamping die of this embodiment adopts a shearing then stamping method, which preemptively offsets most of the springback force of the housing 10 material, ensuring the stability of the notch size.

[0057] Furthermore, the stamping die structure of this embodiment is simple, has low manufacturing cost, is easy to disassemble and assemble, saves stamping costs, has high production efficiency, and meets the needs of mass production.

[0058] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A stamping die for a notch in the side wall of an automotive motor housing, comprising an upper die assembly and a lower die assembly, characterized in that: The lower mold assembly is connected to a cutting die (8) that cooperates with the housing (10). The side wall of the cutting die (8) is provided with a groove (81), and the two sides of the groove (81) are cutting edges (82). The bottom of the upper mold assembly is movably connected to a cutting punch (6), which can extend into the groove (81) and form a shearing fit with the cutting edge (82). The upper mold assembly is provided with an elastic clamping member (7) on one side of the cutting punch (6). The lower die assembly also includes a lower stop (9) located on one side of the cutting die (8), and the lower stop (9) has an inclined surface on one side facing the cutting die (8).

2. The stamping die for the side wall notch of the automotive motor housing according to claim 1, characterized in that: The lower surface of the cutting die (8) is an inclined plane, which, when fixed, makes the upper surface of the shell (10) form an angle of 5° to 30° with the horizontal plane.

3. The stamping die for the side wall notch of the automotive motor housing according to claim 2, characterized in that: The bottom surface of the elastic clamping member (7) is provided with an inclined surface that matches the inclined surface of the upper surface of the housing (10).

4. The stamping die for the side wall notch of the automotive motor housing according to claim 1 or 3, characterized in that: The elastic clamping element (7) is made of polyurethane rubber.

5. The stamping die for the side wall notch of the automotive motor housing according to claim 1, characterized in that: The lower stop (9) has a slot (91) at its lower part for part of the cutting die (8) to extend into.

6. The stamping die for the side wall notch of the automotive motor housing according to claim 5, characterized in that: The lower stop block (9) has a straight surface (92) on the lower side facing the cutting die (8) and a slot (91) on the upper side, and an inclined surface on the upper side.

7. The stamping die for the side wall notch of the automotive motor housing according to claim 1, characterized in that: Both the cutting die (8) and the housing (10) are provided with positioning pin mounting holes (83).

8. The stamping die for the side wall notch of the automotive motor housing according to claim 1, characterized in that: The upper end of the cutting punch (6) is provided with a rotating shaft hole (61), and the lower part of one side facing the elastic clamping member (7) is provided with a cutting edge (64), and the opposite side is a vertical surface (62), which is connected to the bottom surface by a rounded corner (63).

9. The stamping die for the side wall notch of the automotive motor housing according to claim 8, characterized in that: The upper mold assembly includes an upper mold base (1), an upper pad (2), and an upper fixing plate (3) connected from top to bottom. The cutting punch (6) is hinged to the upper fixing plate (3) by a pin (11) passing through the rotating shaft hole (61). The elastic clamping member (7) is connected to the upper fixing plate (3) by screws.

10. The stamping die for the side wall notch of the automotive motor housing according to claim 1, characterized in that: The lower mold assembly includes a lower mold base (4) and a lower fixing plate (5) connected sequentially from bottom to top. The cutting die (8) and the lower stop block (9) are both fixed to the lower fixing plate (5) by bolts.

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