CN114669661B

CN114669661B - Stamping die of special steel part

Info

Publication number: CN114669661B
Application number: CN202111296445.5A
Authority: CN
Inventors: 高存关; 常建军; 裴志荣; 杨文香; 杨冬; 宋艳; 王俊; 迟瑞春; 高文杰; 李俊发; 吴呈奇; 王昌
Original assignee: Inner Mongolia First Machinery Group Corp
Current assignee: Inner Mongolia First Machinery Group Corp
Priority date: 2021-11-03
Filing date: 2021-11-03
Publication date: 2023-08-15
Anticipated expiration: 2041-11-03
Also published as: CN114669661A

Abstract

The invention relates to a stamping die for special steel parts, which also comprises an upper template 3, an upper convex module, a lower convex module and a lower template 4; the center of the upper surface of the lower convex module is provided with a lower convex die groove, the lower convex die groove of the lower convex die is matched with the surface of the upper convex die, the cambered surface of the bending position of the surface of the upper convex die is identical to the cambered surface structure of the bending position of the surface of the lower convex die groove, the cambered surface of the bending position is formed by naturally transiting a concave arc and a convex arc, the arc radius of the cambered surface of the bending position is R1=0.67R, the radius of two arcs at the bending position of a machined bending part is R, and the centers of the two arcs at the bending position of the lower convex die are not overlapped with the arc centers of the two arcs at the bending position of the machined bending part. The invention ensures the precision of the whole dimension between the circular arcs of the part groove, reduces the repair of the circular arcs at each position of the part and improves the production efficiency.

Description

Stamping die of special steel part

Technical Field

The invention belongs to the technical field of machining, and particularly relates to a stamping die for special steel parts.

Background

The special steel part is usually stamped by adopting an oil press mounting die, the stamping die is formed by adopting an integral composite cold stamping die, when the die is designed, the radius of a convex-concave die arc of a die R arc groove, the position of the center of the convex-concave die arc relative to the center of an original part arc (the position relationship is determined by the clearance value of a convex die and a concave die), and the numerical value determination of the center distance between the grooves on two sides are strictly calculated, and the die is repaired for many times in production, but because the material strength of the part is high (sigma b=95 MPa), the forming is complex, the size rebound of the groove part is large, the parameters cannot be fixed, and the quality problem always exists.

The existing stamping method causes the problems of parts that: because the material strength of the part is high, and the material heat treatment states are different, the rebound of stamping after the heat treatment (tempering) of the part blank is difficult to determine, the forming is complex, the rebound accumulation of each part causes the problem that the whole size between the arc and the arc of the groove of the part is difficult to control, the arc forming of each position needs to be repaired by adopting a special groove die for carrying out the rebound or a numerical control bending machine, the production efficiency is low, and the quality of the part is poor.

Disclosure of Invention

The invention aims to provide a stamping die for special steel parts, which ensures the precision of the whole size between the circular arcs of the grooves of the parts, reduces the repair of the circular arcs at all positions of the parts and improves the production efficiency.

The technical scheme of the invention is that the stamping die for the special steel part comprises a lower die body 2, an upper die body 1, an upper template 3, an upper convex module, a lower convex module and a lower template 4;

the upper die plate 3 is fixed on the lower surface of the upper die body 1, the upper punch block is fixed at the center of the upper die plate 3, the lower die plate 4 is fixed on the upper surface of the lower die body 2, the lower punch block is fixed on the upper surface of the lower die plate 4, a lower punch groove is arranged at the center of the upper surface of the lower punch block, the lower punch groove of the lower punch block is matched with the surface of the upper punch block, the cambered surface of the bending part of the surface of the upper punch block is identical with the cambered surface structure of the bending part of the surface of the lower punch groove of the lower punch block, the cambered surface of the bending part is formed by naturally transiting a concave arc and a convex arc,

the inclined planes on two sides of the upper die body 1 are used for forming inclined planes on two sides of a machined bent part, the concave arc radius and the convex arc radius of an arc surface of a bent part of a lower male die are R1, R1=0.67R, the centers of two arcs of the bent part of the lower male die are not overlapped with the centers of the arcs of the two arcs of the bent part of the machined bent part, X and Y are respectively the horizontal distance and the vertical distance between the center of the arc surface of the bent part of the machined bent part and the center of the arc corresponding to the arc center of the arc surface of the bent part of the lower male die, Y=0.33R, X=0.1 t, and t is the distance between the connecting line of the center of the concave arc and the center of the convex arc of the arc surface of the bent part of the machined bent part and the contour.

The invention has the beneficial effects that the structure of the upper convex module and the lower convex module is adopted, so that the heating stamping is realized, the stamping quality of the parts is ensured, the stamping process of the same type of parts is effectively solved, the dimensional accuracy of the workpiece is well ensured, the service life of the die is long, the quality is stable, the operation is convenient, the repair of circular arcs at all positions of the parts is reduced, and the production efficiency is improved.

Drawings

FIG. 1 is a schematic structural view of a stamping die for a special steel part according to the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a partial schematic view of the assembled structure of the present invention in use;

FIG. 4 is an enlarged partial view of FIG. 3;

fig. 5 is a part drawing of a part to be machined.

Detailed Description

The technical scheme of the invention is further described in detail below with reference to the attached drawings.

As shown in fig. 1 to 4, the stamping die for the special steel part comprises a lower die body 2, an upper die body 1, an upper template 3, an upper convex module, a lower convex module and a lower template 4.

The upper die body 1 is fixed on the lower bottom surface of the upper beam of the oil press through bolts and bolt pressing plates, and can also adopt various structures such as welding or casting, wherein the inclined planes on two sides of the upper die body 1 are used for forming inclined planes on two sides of a processed bent part (large bent angle and circular arc on two sides of the processed bent part). An upper molding plate 3 is fixed on the lower surface of the upper mold body 1, and an upper male mold block is fixed at the center of the upper molding plate 3. The lower plate 4 is fixed on the upper surface of the lower die body 2. The lower die body 2 is fixed on a workbench of the oil press. The lower male die block is fixed on the upper surface of the lower die plate 4, a lower male die groove is arranged in the center of the upper surface of the lower male die block, the lower male die groove of the lower male die block is matched with the surface of the upper male die block, a cambered surface of a bent part to be processed is formed in a space between the surface of the upper male die block and the surface of the lower male die block, the cambered surface of the bent part of the surface of the upper male die block is identical to the cambered surface of the bent part of the surface of the lower male die groove of the lower male die block in structure, and the lower male die block are formed by natural transition of a concave arc and a convex arc.

The radius of the concave arc and the radius of the convex arc of the arc surface at the bending position of the lower male die are R1, R1=0.67R, the radius of two arcs at the bending position of the machined bending part is R, the height of the lower male die is H, and the H value is the same as the depth of the arc groove on the machined bending part. The centers of the two circular arcs at the bending position of the lower punch block are not coincident with the centers of the two circular arcs at the bending position of the processed bending part.

The center of the concave arc and the center of the convex arc in the arc surface of the bent part to be processed are connected, the distance t between two intersection points of the connecting line and the profile is Y=R-R1=0.33R, X=0.1 t, and X and Y are the horizontal distance and the vertical distance between the center of the arc (the center of the concave arc or the center of the convex arc) in the arc surface of the bent part to be processed and the center of the arc corresponding to the arc surface of the bent part of the lower male die respectively. All units are millimeters.

Heating a processed bent part to 900 ℃ in a blank, then stamping, determining L1 and L2 by combining the overall size of a convex-concave die corresponding to the center distance of a groove at the bending position at two sides of the processed bent part with the R1 value and the X, Y value, wherein L1 is the distance between the connecting points of concave arcs and convex arcs of cambered surfaces at two sides of an upper male die block, L2 is the distance between the connecting points of concave arcs and convex arcs of cambered surfaces at two sides of a lower male die block, and weighting the L1 and L2 in a cold state, wherein the weighting coefficient is 1.007.

The whole die is formed by stamping after the upper die plate and the lower die plate are closed by the beam of the oil press, and the stamping blank of the part is stamped after being heated (900 ℃).

Through verifying the part mold, the mold is used for stamping in a heating state, so that the completely qualified part is obtained at one time, the fixed design basis for solving the design of the similar part mold is obtained, the dimensional tolerance requirement of the part after stamping forming is ensured, and the use requirement of a product is met.

Claims

1. The utility model provides a stamping die of special steel part, this stamping die includes lower die body and last die body, characterized by: the stamping die further comprises an upper shaping plate, an upper male die block, a lower male die block and a lower shaping plate;

the upper die plate is fixed on the lower surface of the upper die body, the upper punch block is fixed at the center of the upper die plate, the lower die plate is fixed on the upper surface of the lower die body, the lower punch block is fixed on the upper surface of the lower die plate, a lower punch groove is arranged at the center of the upper surface of the lower punch block, the lower punch groove of the lower punch block is matched with the surface of the upper punch block, the cambered surface of the bending position of the surface of the upper punch block is identical to the cambered surface of the bending position of the surface of the lower punch groove of the lower punch block, and the cambered surface of the bending position is formed by naturally transiting a concave arc and a convex arc;

the upper die body is used for forming inclined planes on two sides of a machined bent part, the concave arc radius and the convex arc radius of an arc surface at the bending position of the lower male die block are R1, R1=0.67R, the radius of two arcs at the bending position of the machined bent part is R, the centers of the two arcs at the bending position of the lower male die block are not coincident with the arc centers of the two arcs at the bending position of the machined bent part, X and Y are respectively the horizontal distance and the vertical distance between the arc center of the arc surface at the bending position of the machined bent part and the arc center corresponding to the arc center of the arc surface at the bending position of the lower male die block, Y=0.33R, X=0.1 t, and t is the distance between the connecting line of the concave arc center and the convex arc center of the arc surface at the bending position of the machined bent part and two intersection points of the contour.