CN210280380U - Machining die for balance block of automobile engine - Google Patents
Machining die for balance block of automobile engine Download PDFInfo
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- CN210280380U CN210280380U CN201920430852.2U CN201920430852U CN210280380U CN 210280380 U CN210280380 U CN 210280380U CN 201920430852 U CN201920430852 U CN 201920430852U CN 210280380 U CN210280380 U CN 210280380U
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Abstract
The utility model provides a mold processing of automobile engine's balancing piece, its technical problem that can solve the quick production that uses current mould can't realize automobile engine's balancing piece and ensure its overall dimension simultaneously. The utility model provides a mold processing of automobile engine's balancing piece, its includes upper die base and die holder, and upper die base and die holder pass through outer guide pillar, outer guide pin bushing direction compound die, its characterized in that: the processing die further comprises a shearing structure, a feeding mechanism, a first forming structure, a chamfering structure, a second forming structure, a punching structure and a burr beating structure which are sequentially arranged along the feeding direction. The upper die base and the lower die base are assembled once, six steps can be completed simultaneously, the continuous processing and the rapid production of the balance block of the automobile engine can be realized, and the qualification rate is high; the small downward convex hull is preset at the center through hole of the top wall of the balance block of the automobile engine, so that the material flow is controlled in the forming process, the top wall is prevented from being too thin, and the product quality is ensured.
Description
Technical Field
The utility model relates to a mould field, concretely relates to mold processing of automobile engine's balancing piece.
Background
The utility model provides a balancing piece of automobile engine, its part shape is shown in figure 5, and the balancing piece of automobile engine wholly is the lid structure, includes roof and the round lateral wall that downwardly extending from roof circumference, and roof and lateral wall enclose to close and form lower extreme open-ended cavity, have seted up the pilot hole on the roof, and the middle part of lateral wall is equipped with round arc flange, and the position that the lateral wall is located the upside of arc flange and the position of downside are the structure of basic symmetry. Conventional dies do not allow for rapid production thereof while ensuring shape definition requirements and boundary dimensions.
SUMMERY OF THE UTILITY MODEL
The utility model provides a mold processing of automobile engine's balancing piece, its technical problem that can solve the quick production that uses current mould can't realize automobile engine's balancing piece and ensure its overall dimension simultaneously.
Its technical scheme is such, a mold processing of automobile engine's balancing piece, and it includes upper die base and die holder, the upper die base with the die holder passes through outer guide pillar, outer guide pin bushing direction cooperation, its characterized in that: the processing die further comprises a shearing structure, a feeding structure, and a first forming structure, a chamfering structure, a second forming structure, a punching structure and a burr beating structure which are sequentially arranged along the feeding direction;
the shearing structure comprises a shearing stripper plate, a shearing punch, a shearing knife edge and a shearing sinking disc, the shearing stripper plate is elastically connected below the upper die base through a nitrogen spring and is in guiding fit with the upper die base through an inner guide pillar and an inner guide sleeve, the shearing punch is arranged below the upper die base through a punch clamping plate and a punch base plate and can penetrate through the shearing stripper plate downwards, the shearing knife edge is arranged on the shearing sinking disc, and the shearing sinking disc is arranged on the lower die base;
the feeding structure comprises a material supporting plate, a feeding sliding block, a guide pressing block and a sliding cylinder, a blanking groove extending perpendicular to the feeding direction is formed in the position, below the shearing knife opening, of the lower die base, the guide pressing blocks are symmetrically arranged on two sides of the blanking groove, the feeding sliding block is slidably arranged between a pair of the guide pressing blocks and connected with the sliding cylinder, the material supporting plate is arranged on the feeding sliding block, and a circle of positioning needles arranged around the material sheet are arranged on the material supporting plate;
the first forming structure comprises a first forming female die, a first stripper plate, a convex hull punch, a first forming male die, a convex hull female die, a forming pressure plate and a first forming sinking disc, the first forming female die is arranged below the upper die base through a male clamping plate and a male clamping backing plate, the first stripper plate is elastically connected below the upper die base through a nitrogen spring and can penetrate through the first forming female die downwards, the convex hull punch is arranged on the first stripper plate, the first forming convex die is arranged on the first forming sinking disc and can penetrate through the forming material pressing plate upwards, the first forming convex die is matched with the first forming concave die, the convex hull concave die is arranged on the first forming convex die and is matched with the convex hull punch, the forming material pressing plate is elastically connected below the upper die base through a nitrogen spring, and the first forming sinking disc is arranged on the lower die base and is positioned below the forming material pressing plate;
the chamfering structure comprises a chamfering pressure plate, a chamfering upper ejection rod, a chamfering male die, a chamfering female die, a chamfering fixing seat and a chamfering lower ejection rod, the chamfering pressure plate is mounted below the upper die seat through a male clamping plate and a male clamping backing plate, the chamfering upper ejection rod is elastically connected below the upper die seat through a nitrogen spring and can penetrate through the chamfering pressure plate downwards, the chamfering male die is embedded in the chamfering fixing seat and surrounds the periphery of the chamfering female die, the chamfering fixing seat is mounted on the lower die seat, the chamfering female die is elastically connected on the lower die seat through the nitrogen spring, and the chamfering lower ejection rod is elastically connected on the lower die seat through the nitrogen spring and can penetrate through the chamfering female die upwards;
the second forming structure comprises a second forming material pressing plate, a second forming upper ejector rod, a second forming male die, a second forming fixing seat, a second forming female die and a second forming lower ejector rod, the second forming material pressing plate is arranged below the upper die base through a male clamping plate and a male clamping backing plate, the second forming upper ejector rod is elastically connected below the upper die base through a nitrogen spring and can penetrate through the second forming material pressing plate downwards, the second forming convex die is embedded in the second forming fixed seat and surrounds the periphery of the second forming concave die, the second forming fixed seat is arranged on the lower die seat, the second forming female die is elastically connected on the lower die seat through a nitrogen spring and limited on the second forming male die by a hanging table, the second forming lower ejector rod is elastically connected to the lower die holder through a nitrogen spring and can penetrate through the second forming female die upwards;
the punching structure comprises a punching punch, a punching material pressing insert, a punching stripper plate, a punching material pressing back plate, a punching lower die edge and a lower die pad elevation plate, the punching punch is fixed below the upper die base through a male clamping plate and a male clamping pad plate and can penetrate through the punching stripper plate and the punching material pressing insert downwards, the punching material pressing insert is embedded in the punching stripper plate, the punching stripper plate is fixed below the punching material pressing back plate and is in guiding fit with the upper die base through an inner guide pillar and an inner guide sleeve and is limited through an equal-height sleeve, the punching stripper plate is elastically connected below the upper die base through a nitrogen spring, the punching lower die edge is fixed on the lower die pad elevation plate through the edge clamping plate and the edge pad plate, and the lower die pad elevation plate is installed on the lower die base;
the burr beating structure comprises a burr beating pressure plate, a burr beating punch and a burr beating sinking plate, the burr beating pressure plate is installed under the upper die bed plate, the upper die bed plate is installed under the upper die base, the burr beating punch is installed in the burr beating sinking plate, and the burr beating sinking plate is fixed on the lower die bed plate through the lower die fixing clamp plate and the lower die backing plate.
Furthermore, pay-off structure still includes wear-resisting V shaped plate and wear-resisting dull and stereotyped, wear-resisting V shaped plate with wear-resisting dull and stereotyped install in the bottom of charging chute and with pay-off slider sliding fit, pay-off slider still with wear-resisting V shaped plate direction cooperation.
The utility model discloses a processing mould, its be equipped with between upper die base and the die holder shearing structure and along the first forming structure, chamfer structure, second forming structure, the structure of punching a hole and clap the burr structure that the pay-off direction set gradually, its upper die base and die holder compound die once, can accomplish six process steps simultaneously, can realize the continuous processing of automobile engine's balancing piece, quick production to guarantee shape profile tolerance requirement and boundary size, the qualification rate is high; a small downward convex hull is preset at a central through hole of the top wall of a balance block of an automobile engine, so that the small downward convex hull is not only used for positioning in the subsequent process step, but also used for controlling material flow in the forming process to prevent the top wall from being too thin, and further ensure the product quality; add string platform and nitrogen spring in chamfer structure, the second forming structure of mould, realize the operation of going up top of chamfer fixing base and second forming fixing base and play limiting displacement, cooperate corresponding liftout bar down, ensure that the work piece is deviate from smoothly.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of a part enlarged at a in fig. 1, namely a sectional structural diagram of a first viewing angle of the shearing structure and the feeding structure.
Fig. 3 is a schematic structural diagram of a portion B in fig. 1 after being enlarged, that is, a schematic structural diagram of a cross section of a first viewing angle of the first forming structure, the chamfering structure, the second forming structure, the punching structure and the burr beating structure.
Fig. 4 is a schematic cross-sectional structure diagram of a second viewing angle of the shearing structure and the feeding structure according to the present invention.
FIG. 5 is a schematic view of the shape of the components of the counterweight of the automobile engine.
Fig. 6 is a schematic technical view of the continuous processing of the mold corresponding to the material tape, in which the first step (SAT # 1) is omitted.
Detailed Description
As shown in fig. 1 to 4, a processing mold for a balance weight of an automobile engine comprises an upper mold base 1 and a lower mold base 2, wherein the upper mold base 1 and the lower mold base 2 are in guiding fit through an outer guide pillar 3 and an outer guide sleeve 5, 4 is an outer guide pillar fixing base, 6 is an outer guide sleeve fixing base, and the processing mold further comprises a shearing structure, a feeding structure, and a first forming structure, a chamfering structure, a second forming structure, a punching structure and a burr beating structure which are sequentially arranged along a feeding direction;
the shearing structure comprises a shearing stripper plate 7, a shearing punch 11, a shearing knife edge 13 and a shearing sinking disc 14, the shearing stripper plate 7 is elastically connected below the upper die base 1 through a first upper die nitrogen spring 10, the shearing stripper plate 7 is in guiding fit with the upper die base 1 through an inner guide pillar 8 and an inner guide sleeve 9 and is limited through a hook 15, the shearing punch 11 is installed below the upper die base 1 through a punch clamping plate 12 and a punch backing plate and can penetrate through the shearing stripper plate 7 downwards, the shearing knife edge 13 is installed on the shearing sinking disc 14, and the shearing sinking disc 14 is installed on the lower die base 2;
the feeding structure comprises a material supporting plate 16, a feeding sliding block 17, guide pressing blocks 20 and a sliding cylinder 22, a blanking groove extending perpendicular to the feeding direction is formed in the position, below the shearing knife edge 13, of the lower die holder 2, the guide pressing blocks 20 are symmetrically arranged on two sides of the blanking groove, the feeding sliding block 17 is slidably arranged between the pair of guide pressing blocks 20 and connected with the sliding cylinder 22, 23 is a piston rod of the cylinder, the material supporting plate 16 is arranged on the feeding sliding block 17, and a circle of positioning needles arranged around the material sheet are arranged on the material supporting plate 16;
the first forming structure comprises a first forming female die 24, a first stripper plate 27, a convex hull punch 29, a first forming male die 30, a convex hull female die 34 and a forming pressure plate 31, wherein the first forming female die 24 is arranged below an upper die holder 1 through a first male clamp plate 25 and a first male clamp backing plate 26, the first stripper plate 27 is elastically connected below the upper die holder 1 through a second upper die nitrogen spring 28 and can penetrate through the first forming female die 24 downwards, the convex hull punch 29 is arranged on the first stripper plate 27, the first forming male die 30 is arranged on a lower die holder 2 through a lower die clamp plate 33 and a clamp backing plate and can penetrate through the forming pressure plate 31 upwards, the first forming male die 30 is matched with the first forming female die 24, the convex hull female die 34 is arranged on the first forming male die 30 and matched with the convex hull punch 29, the forming pressure plate 31 is elastically connected below the upper die holder through a first lower die nitrogen spring 32 and is limited by an equal-height sleeve, the molding material-pressing plate 31 is surrounded by the first molding die 24;
the chamfering structure comprises a chamfering pressing plate 35, a chamfering upper material pushing rod 39 and a chamfering male die 41, the chamfering die comprises a chamfering female die 43, a chamfering fixed seat 40 and a chamfering lower ejection rod 46, wherein the chamfering pressure plate 35 is installed below the upper die holder 1 through a second male clamp plate 36 and a second male clamp backing plate 37, the chamfering upper ejection rod 39 is elastically connected below the upper die holder 1 through a third upper die nitrogen spring 39 and can downwards penetrate through the chamfering pressure plate 35, a chamfering male die 41 is embedded in the chamfering fixed seat 40 and surrounds the periphery of the chamfering female die, the chamfering fixed seat 40 is installed on the lower die holder 2 through a backing plate 42, the chamfering female die 43 is elastically connected on the lower die holder 2 through a second lower die nitrogen spring 45 and is limited on the chamfering male die 41 through a hanging table 44, the chamfering lower ejection rod 46 is elastically connected on the lower die holder 2 through a nitrogen spring 47 and can upwards penetrate through the chamfering female die 43, and the chamfering lower ejection rod 46 is limited on the chamfering female die 43 through;
the second molding structure comprises a second molding press plate 48, a second molding upper ejector rod 51, a second molding male die 53, a second molding fixing seat 54, a second molding female die 55 and a second molding lower ejector rod 58, the second molding press plate 48 is mounted below the upper die holder 1 through a male clamping plate 50 and a male clamping backing plate 49, the second molding upper ejector rod 51 is elastically connected below the upper die holder 1 through a fourth upper die nitrogen spring 52 and can penetrate through the second molding press plate 48 downwards, the second molding male die 53 is embedded in the second molding fixing seat 54 and surrounds the periphery of the second molding female die, the second molding fixing seat 54 is mounted on the lower die holder 2 through a backing plate 42, the second molding female die 55 is elastically connected on the lower die holder 2 through a fourth lower die nitrogen spring 58 and is limited on the second molding male die 53 by a hanging table 56, the second molding lower ejector rod 58 is elastically connected on the lower die holder 2 through a nitrogen spring 59 and can penetrate through the second molding female die 55 upwards, the second molding lower ejector rod 58 is limited to the second molding female die 55 by a hanging table;
the punching structure comprises a first punching punch 60, a second punching punch 61, a punching press insert 67, a punching stripper plate 64, a punching stripper plate 65 and a punching lower die edge 68, wherein the first punching punch 60 and the second punching punch 61 are fixed below the upper die holder 1 through a third male clamp plate 62 and a third male clamp backing plate 63 and can downwards penetrate through the punching stripper plate and the punching press insert 67, the punching press insert 67 is embedded in the punching stripper plate 64, the punching stripper plate 64 is fixed below the punching stripper plate 65, the punching stripper plate 64 is guided and matched with the upper die holder 1 through an inner guide pillar and an inner guide sleeve and limited through an equal-height sleeve, the punching stripper plate 65 is elastically connected below the upper die holder 1 through a fifth upper die nitrogen spring 66, the punching lower die edge 68 is fixed on a lower die pad plate through an edge clamping plate 69 and a lower die pad plate, and the pad plate is arranged on the lower die holder 2;
the burr beating structure comprises a burr beating pressure plate 70, a burr beating punch 73 and a burr beating sinking plate 72, the burr beating pressure plate 70 is installed under an upper die bed plate, the upper die bed plate is installed under an upper die base 1, the burr beating punch 73 is installed in the burr beating sinking plate 72, and the burr beating sinking plate 72 is fixed on the lower die bed plate through a lower die fixing clamp plate 71 and a lower die bed plate.
The feeding structure further comprises a wear-resistant V-shaped plate 19 and a wear-resistant flat plate, the wear-resistant V-shaped plate 19 and the wear-resistant flat plate are mounted at the bottom of the blanking groove and are in sliding fit with the feeding sliding block 17, and the feeding sliding block 17 is further in guiding fit with the wear-resistant V-shaped plate 19.
Use the utility model discloses a mold processing is processed automobile engine's balancing piece, and six process steps can be accomplished simultaneously to its upper die base 1 and 2 compound dies of die holder once, as shown in fig. 6:
first step (SAT # 1): in the die closing process, the shearing sinking disc 14 is matched with the shearing stripping plate 7 to press the material belt, the shearing punch 11 of the shearing structure is matched with the shearing knife edge 13 to cut the circular material plate from the material belt, the cut material plate falls onto the material supporting plate 16, is pulled by the sliding cylinder 22 to be separated, and is transferred to the material placing sinking disc on the right side of the figure 2 by the manipulator;
second step (SAT # 2): in the die assembly process, firstly, the first forming female die 24 is matched with a forming material pressing plate 31 to press a material plate, then the first forming male die 30 is matched with the first forming female die 24 to realize one-step forming operation, namely, the top wall is bent downwards in the circumferential direction and the upper half part of the side wall is formed, then a convex hull punch 29 and a convex hull female die 34 are matched with the center of the top wall to form a downward small convex hull, and the small convex hull is used for matching with a lower material ejecting rod of a subsequent process step to realize workpiece positioning;
third step (SAT # 3): in the die closing process, firstly, the chamfer pressing plate 35 is matched with the chamfer lower ejector rod 46 to press the workpiece processed in the second step, then the chamfer male die 41 and the chamfer female die 43 are matched with the bottom of the side wall to form an inward-bent chamfer, and in the die opening process, the chamfer female die 43 and the chamfer lower ejector rod 46 are respectively under the action of a nitrogen spring and are matched with each other to eject the workpiece;
fourth step (SAT # 4): in the die closing process, firstly, the second forming material pressing plate 48 is matched with the second forming lower ejector rod 58 to press the workpiece processed in the third step, then the second forming male die 53 is matched with the second forming female die 55 to form the lower half part shape of the side wall, and in the die opening process, the second forming female die 55 and the second forming lower ejector rod 58 are respectively under the action of a nitrogen spring and are mutually matched to eject the workpiece;
fifth step (SAT # 5): in the die closing process, the punching pressing insert 67 and the punching lower die knife edge 68 are matched to press the workpiece processed in the fourth step, and then the first punching punch 60 and the second punching punch 61 are matched with the lower die knife edge to remove the small convex hull and punch out a hole position to be processed;
sixth step (SAT # 6): in the die assembly process, the burr pressing plate 70 and the burr pressing sinking plate 72 are matched to press the workpiece processed in the fifth step, and the burr pressing punch 73 acts on the edge of a hole site formed after the middle punching is removed so as to remove burrs generated by punching.
Claims (2)
1. The utility model provides a mold processing of automobile engine's balancing piece, its includes upper die base and die holder, the upper die base with the die holder passes through outer guide pillar, outer guide pin bushing direction cooperation, its characterized in that: the processing die further comprises a shearing structure, a feeding structure, and a first forming structure, a chamfering structure, a second forming structure, a punching structure and a burr beating structure which are sequentially arranged along the feeding direction;
the shearing structure comprises a shearing stripper plate, a shearing punch, a shearing knife edge and a shearing sinking disc, the shearing stripper plate is elastically connected below the upper die base through a nitrogen spring and is in guiding fit with the upper die base through an inner guide pillar and an inner guide sleeve, the shearing punch is arranged below the upper die base through a punch clamping plate and a punch base plate and can penetrate through the shearing stripper plate downwards, the shearing knife edge is arranged on the shearing sinking disc, and the shearing sinking disc is arranged on the lower die base;
the feeding structure comprises a material supporting plate, a feeding sliding block, a guide pressing block and a sliding cylinder, a blanking groove extending perpendicular to the feeding direction is formed in the position, below the shearing knife opening, of the lower die base, the guide pressing blocks are symmetrically arranged on two sides of the blanking groove, the feeding sliding block is slidably arranged between a pair of the guide pressing blocks and connected with the sliding cylinder, the material supporting plate is arranged on the feeding sliding block, and a circle of positioning needles arranged around the material sheet are arranged on the material supporting plate;
the first forming structure comprises a first forming female die, a first stripper plate, a convex hull punch, a first forming male die, a convex hull female die, a forming pressure plate and a first forming sinking disc, the first forming female die is arranged below the upper die base through a male clamping plate and a male clamping backing plate, the first stripper plate is elastically connected below the upper die base through a nitrogen spring and can penetrate through the first forming female die downwards, the convex hull punch is arranged on the first stripper plate, the first forming convex die is arranged on the first forming sinking disc and can penetrate through the forming material pressing plate upwards, the first forming convex die is matched with the first forming concave die, the convex hull concave die is arranged on the first forming convex die and is matched with the convex hull punch, the forming material pressing plate is elastically connected below the upper die base through a nitrogen spring, and the first forming sinking disc is arranged on the lower die base and is positioned below the forming material pressing plate;
the chamfering structure comprises a chamfering pressure plate, a chamfering upper ejection rod, a chamfering male die, a chamfering female die, a chamfering fixing seat and a chamfering lower ejection rod, the chamfering pressure plate is mounted below the upper die seat through a male clamping plate and a male clamping backing plate, the chamfering upper ejection rod is elastically connected below the upper die seat through a nitrogen spring and can penetrate through the chamfering pressure plate downwards, the chamfering male die is embedded in the chamfering fixing seat and surrounds the periphery of the chamfering female die, the chamfering fixing seat is mounted on the lower die seat, the chamfering female die is elastically connected on the lower die seat through the nitrogen spring, and the chamfering lower ejection rod is elastically connected on the lower die seat through the nitrogen spring and can penetrate through the chamfering female die upwards;
the second forming structure comprises a second forming material pressing plate, a second forming upper ejector rod, a second forming male die, a second forming fixing seat, a second forming female die and a second forming lower ejector rod, the second forming material pressing plate is arranged below the upper die base through a male clamping plate and a male clamping backing plate, the second forming upper ejector rod is elastically connected below the upper die base through a nitrogen spring and can penetrate through the second forming material pressing plate downwards, the second forming convex die is embedded in the second forming fixed seat and surrounds the periphery of the second forming concave die, the second forming fixed seat is arranged on the lower die seat, the second forming female die is elastically connected on the lower die seat through a nitrogen spring and limited on the second forming male die by a hanging table, the second forming lower ejector rod is elastically connected to the lower die holder through a nitrogen spring and can penetrate through the second forming female die upwards;
the punching structure comprises a punching punch, a punching material pressing insert, a punching stripper plate, a punching material pressing back plate, a punching lower die edge and a lower die pad elevation plate, the punching punch is fixed below the upper die base through a male clamping plate and a male clamping pad plate and can penetrate through the punching stripper plate and the punching material pressing insert downwards, the punching material pressing insert is embedded in the punching stripper plate, the punching stripper plate is fixed below the punching material pressing back plate and is in guiding fit with the upper die base through an inner guide pillar and an inner guide sleeve and is limited through an equal-height sleeve, the punching stripper plate is elastically connected below the upper die base through a nitrogen spring, the punching lower die edge is fixed on the lower die pad elevation plate through the edge clamping plate and the edge pad plate, and the lower die pad elevation plate is installed on the lower die base;
the burr beating structure comprises a burr beating pressure plate, a burr beating punch and a burr beating sinking plate, the burr beating pressure plate is installed under an upper die bed plate, the upper die bed plate is installed under an upper die base, the burr beating punch is installed in the burr beating sinking plate, and the burr beating sinking plate is fixed on the lower die bed plate through a lower die fixing clamp plate and a lower die backing plate.
2. The processing mold for the balance weight of the automobile engine according to claim 1, wherein: the feeding structure further comprises a wear-resistant V-shaped plate and a wear-resistant flat plate, the wear-resistant V-shaped plate and the wear-resistant flat plate are mounted at the bottom of the blanking groove and are in sliding fit with the feeding sliding block, and the feeding sliding block is further in guiding fit with the wear-resistant V-shaped plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920430852.2U CN210280380U (en) | 2019-04-01 | 2019-04-01 | Machining die for balance block of automobile engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920430852.2U CN210280380U (en) | 2019-04-01 | 2019-04-01 | Machining die for balance block of automobile engine |
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| Publication Number | Publication Date |
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| CN210280380U true CN210280380U (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920430852.2U Active CN210280380U (en) | 2019-04-01 | 2019-04-01 | Machining die for balance block of automobile engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112935092A (en) * | 2021-01-22 | 2021-06-11 | 苏州三维精密金属制品有限公司 | Mold and method for extruding sharp corner by stretching excircle |
-
2019
- 2019-04-01 CN CN201920430852.2U patent/CN210280380U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112935092A (en) * | 2021-01-22 | 2021-06-11 | 苏州三维精密金属制品有限公司 | Mold and method for extruding sharp corner by stretching excircle |
| CN112935092B (en) * | 2021-01-22 | 2022-09-02 | 苏州三维精密金属制品有限公司 | Mold and method for extruding sharp corner by stretching excircle |
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