Trimming die capable of preventing deformation of crankshaft forge piece

Abstract

The utility model discloses a trimming die for preventing deformation of a crankshaft forge piece, which comprises an upper trimming die and a lower trimming die, the top of the lower trimming die is provided with a protruding supporting structure, the supporting structure forms an annular material containing cavity with the same shape as the forge piece, and the crankshaft forge piece with a flash is placed in the material containing cavity. Lower cutting edges are arranged on the portion, making contact with the crankshaft forge piece with the flash, of the periphery of the containing cavity, upper cutting edges are arranged on the upper cutting die, and the lower cutting edges correspond to the upper cutting edges and are distributed on the periphery of the crankshaft forge piece with the flash. The supporting structure is a structure with local fall; the supporting surface of the easily deformed counterweight part of the crankshaft is lower than the supporting surfaces of other parts, and the fall height is greater than the trimming depth of the crankshaft; the lower cutting edge is of an inclined edge structure. The crankshaft forge piece has the advantages that deformation force borne by the crankshaft forge piece is reduced; the resistance between the cutting edge structure and the forging in the trimming process of the crankshaft forging is reduced, and the problems that the straightness of the crankshaft forging is out of tolerance, indexing is out of tolerance, and the balance weight is seriously deformed are solved.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to a stamping die for a crankshaft, more particularly to a die for cutting off flash. Background Art

[0002] The crankshaft forging is a forging with a relatively complex structure. The shape complexity coefficient of the forging is usually S3. The existing trimming die includes an upper die and a lower die. When working, the crankshaft forging is placed on the lower die. The lower die is designed with a support structure and a lower cutting edge structure. The support structure of the crankshaft forging is a plane, and the lower cutting edge structure is a straight edge. Then the upper die punches the crankshaft forging placed on the lower die, and the crankshaft forging is separated from the flash by the support structure and the lower cutting edge structure, thereby achieving the effect of stamping and trimming. However, during the stamping process, the force area of ​​the lower die support structure and the resistance of the lower cutting edge structure and the crankshaft forging during the trimming process are likely to cause deformation of the crankshaft forging body. After the crankshaft forging is deformed, it causes a number of problems such as excessive straightness, excessive indexing, and serious deformation of the counterweight. In addition, the unstable quality of the crankshaft forging has a great impact on subsequent processing, and there may be problems of subsequent machining waste of the finished crankshaft product. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a trimming die to prevent deformation of crankshaft forgings, including a trimming upper die and a trimming lower die, a protruding support structure is arranged on the top of the trimming lower die, the support structure forms an annular material cavity with the same shape as the forging, a crankshaft forging with flash is placed in the material cavity, a lower cutting edge is arranged at a contact part of the material cavity around the crankshaft forging with flash, the trimming upper die is provided with an upper cutting edge, the lower cutting edge corresponds to the upper cutting edge, and is distributed around the crankshaft forging with flash; the support structure is a structure with a local drop; the support surface of the balancing weight part of the crankshaft that is easily deformed is lower than the support surface of the other parts, and this drop height is greater than the trimming depth of the crankshaft; the lower cutting edge is a beveled edge structure.

[0004] Preferably, the angle between the lower cutting edge and the vertical direction is 3-4°.

[0005] To ensure a smooth transition, the supporting surface of the counterweight is connected to the supporting surfaces of the other parts through an inclined plane.

[0006] The utility model has the advantages that the support structure in the trimming lower die is changed from a plane structure to a structure with a local drop, the support surface of the counterweight part of the crankshaft that is easy to deform is lower than the other parts, the drop height is greater than the trimming depth of the crankshaft, the trimming force is changed from acting on all crankshaft forgings at the same time to first cutting off a part of the flash and then cutting off the flash of the counterweight part, under the condition that the trimming pressure remains unchanged, the force area of ​​the flash at the same time in the trimming process is reduced, the trimming speed is accelerated, and the deformation force on the crankshaft forging is reduced; in addition, the lower cutting edge structure is changed from the existing straight edge structure to an oblique edge structure through high-strength alloy welding materials, which ensures the service life of the lower cutting edge structure and reduces the resistance of the cutting edge structure to the forging during the trimming process of the crankshaft forging. Through the improvement of the two structures of the trimming lower die, the deformation of the crankshaft forging during the trimming process is effectively controlled, and the problems of crankshaft forging straightness out of tolerance, indexing out of tolerance, serious deformation of the counterweight and the like are solved, and the improvement of the quality of the crankshaft forging also improves the quality of subsequent finished product processing, and reduces the waste of the finished crankshaft due to forging quality problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the structure of the trimming upper die, crankshaft and trimming lower die;

[0008] Figure 2 is a schematic diagram of the die under trimming;

[0009] Figure 3 for Figure 2 A magnified schematic diagram of position A;

[0010] Figure 4 for Figure 2 A magnified schematic diagram of position B;

[0011] Figure 5 It is a schematic diagram of a support structure with a local drop of the utility model;

[0012] In the figure, 1 is the trimming upper die, 2 is the trimming lower die, 3 is the supporting structure, 4 is the material holding cavity, 5 is the crankshaft forging, 6 is the lower cutting edge 6, 7 is the upper cutting edge, 8 is the flash, and 9 is the forging after trimming. DETAILED DESCRIPTION

[0013] The utility model is described in detail below with reference to the accompanying drawings. As shown in the figure, the utility model comprises a trimming upper die 1 and a trimming lower die 2. A protruding support structure 3 is provided on the top of the trimming lower die 2. The support structure 3 forms an annular material cavity 4 with the same shape as the forging. A crankshaft forging 5 with flash is placed in the material cavity 4. A lower cutting edge 6 is provided at a contact portion of the material cavity 4 with the crankshaft forging 5 with flash. The trimming upper die 1 is provided with an upper cutting edge 7. The lower cutting edge 6 corresponds to the upper cutting edge 7 and is distributed around the crankshaft forging 5 with flash 8. The support structure 3 is a structure with a local drop. The support surface 32 of the counterweight portion of the crankshaft that is easily deformed is lower than the support surface 31 of the other portions, and the drop height is greater than the trimming depth of the crankshaft. The lower cutting edge 6 is a beveled edge structure.

[0014] The angle a between the lower cutting edge and the vertical direction is 3-4°.

[0015] The supporting surface 32 of the counterweight portion is connected to the supporting surfaces 31 of the remaining portions via an inclined surface 33 .

Claims

1. A trimming die for preventing deformation of a crankshaft forging, comprising a trimming upper die and a trimming lower die, wherein a protruding support structure is provided on the top of the trimming lower die, wherein the support structure forms an annular material cavity having the same shape as the forging, wherein the crankshaft forging with flash is placed in the material cavity, wherein a lower cutting edge is provided at a contact portion of the material cavity around the crankshaft forging with flash, wherein the trimming upper die is provided with an upper cutting edge, wherein the lower cutting edge corresponds to the upper cutting edge and is distributed around the crankshaft forging with flash; wherein the lower cutting edge corresponds to the upper cutting edge and is distributed around the crankshaft forging with flash; wherein the lower cutting edge corresponds to the upper cutting edge and is distributed around the crankshaft forging with flash; wherein the lower cutting edge corresponds to the upper cutting edge and is distributed around the crankshaft forging with flash; The support structure is a structure with a local drop; the support surface of the balance weight part of the crankshaft that is easily deformed is lower than the support surface of the other parts, and the drop height is greater than the cutting depth of the crankshaft; the lower cutting edge is a bevel blade structure.

2. The anti-crankshaft forging deformation trimming die according to claim 1, characterized in that: The angle between the lower cutting edge and the vertical direction is 3-4°.

3. The anti-crankshaft forging deformation trimming die according to claim 1, characterized in that: The supporting surface of the counterweight part is connected with the supporting surfaces of other parts through an inclined plane.

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