CN203390140U

CN203390140U - Cold-heading and hole-shrinkage mould

Info

Publication number: CN203390140U
Application number: CN201320452886.4U
Authority: CN
Inventors: 李兴慧
Original assignee: Fawer Automotive Parts Co Ltd
Current assignee: Fawer Automotive Parts Co Ltd
Priority date: 2013-07-29
Filing date: 2013-07-29
Publication date: 2014-01-15
Anticipated expiration: 2023-07-29

Abstract

The utility model discloses a cold-heading and hole-shrinkage mould which comprises a cold-heading groove punch and a cold-heading groove die. The cold-heading groove die comprises a sleeve, a core and a cushion. The sleeve and the cushion are mounted in the sleeve. The number of hole-shrinkage belts of the core of the cold-heading groove die is equal to the number of grooves. The hole-shrinkage belts of the core of the die are identical in width. Shrinkage fine angles of the hole-shrinkage belts are different in initial positions and shrinkage relief angles are different in end positions. Non-die hole-shrinkage belts of the cold-heading groove die has a radial deforming allowance. The cold-heading and hole-shrinkage mould has the advantages that cold-heading forming of multi-groove workpieces is achieved, processing technique of a product is optimized, production cost is greatly lowered, and the cold-heading and hole-shrinkage mould is quite suitable for mass production of automobile fasteners.

Description

A kind of cold-heading stem reducing mould

Technical field

The utility model belongs to cold-heading molding technical field, relates to a kind of cold-heading stem reducing mould; Be specially adapted to the manufacture of multiple-grooved eccentric bolt.

Background technology

Eccentric bolt series products is widely used in the adjustment on each vehicle chassis of passenger car, and known multiple-grooved eccentric bolt processing method is: after rolled thread operation, have bits processing groove milling, manually remove groove milling burr, production efficiency is low, processing cost is high.

The die undergauge band of existing cold-heading stem reducing mould, it is the radially equally distributed circle of same circumference perpendicular to mold axis cross section, when part is out of shape in shrinking, on same radial circumference, there is the metal material of uniform minimizing in the size of part bar portion diameter, at same circumference, shrinking distortion radially evenly occurs, part bar cross section shape is all circular before and after distortion.

Known ZL201010501895.9 needs the bolt molding process of chamfering and multiple-grooved, step processing: first step cold-heading, second step thread rolling; Disclosed is that the mould inner sleeve of cold-heading groove adopts two kinds of materials that hardness is different, and the material hardness at other position of the relative punching press of material of stamped recess part is low and have a limiting structure of certain toughness.Think to those skilled in the art's prejudice that use cold upsetting die of car is routinely difficult to cold-heading and goes out groove, the phenomenon of mould fracture can occur; Thereby abandon the conceptual design that conventional cold upsetting die of car cold-heading goes out groove.Simplify technique, overcoming prejudice is the problem requiring study with cold-heading stem reducing mould ELEMENTARY INTRODUCTION TO NON multiple-grooved eccentric bolt.

Summary of the invention

The utility model discloses a kind of cold-heading stem reducing mould, to solve the problems such as multiple-grooved eccentric work piece in prior art has bits processing groove milling, and production efficiency is low, processing cost is high.

The disclosed a kind of cold-heading stem reducing mould of the utility model, comprises cold-heading groove punch, cold-heading groove die; Cold-heading groove die comprises die sleeve, core rod, die-cushion; Core rod, die-cushion are arranged in die sleeve; It is characterized in that: the undergauge band quantity of cold-heading groove die core rod equals groove quantity; Die core rod undergauge bandwidth is identical; The original position difference at undergauge band shrinking angle, shrinking relief angle end position difference.The non-die undergauge band of cold-heading groove die has radial deformation surplus; The bar portion diameter dimension that guarantees homogeneous deformation region rises slightly.Along the distortion of undergauge band place local radial cold-heading shrinking, there is the part metal of local reducing distortion in workpiece blank, forms arc groove after distortion, before the distortion of part bar portion, is circular cross-section, forms multiple-grooved eccentric work piece cross section after distortion.

The disclosed cold-heading stem reducing mould of the utility model, two of cold-heading groove die undergauge band quantity, die undergauge bandwidth is identical; The original position at the first undergauge band shrinking angle is before the original position at the second undergauge band shrinking angle; The first shrinking relief angle end position is after the second shrinking relief angle end position.

The course of work: process respectively successively bolt end, bolt flange, screw rod, screw flutes at each station of cold headers; Bar portion diameter is circumferentially divided into homogeneous deformation region, nonhomogeneous deformation region; The die undergauge band quantity of cold-heading female mold tool equals groove quantity; Die undergauge bandwidth is identical; The original position difference at undergauge band shrinking angle, shrinking relief angle end position difference; The Metal Phase in nonhomogeneous deformation region flows to homogeneous deformation area differentiation speed; When the bar portion blank of part is out of shape by cold-heading female mold tool, workpiece blank is out of shape along undergauge band place local radial cold-heading shrinking, there is the part metal of local reducing distortion, after distortion, form arc groove, before the distortion of part bar portion, be circular cross-section, after distortion, form multiple-grooved eccentric work piece cross section; Part blank cold-heading is out of shape, and forms the groove of the circumferential distribution certain length equating with undergauge band quantity in the bar portion of part.Thread rolling, thread rolling machine processes the screw thread on screw rod.

Good effect of the present utility model is: realized multiple-grooved workpiece cold upset forming, optimizing product processing technology, reduces production costs greatly, is applicable to very much the production in enormous quantities of fastening parts of automobiles.

Accompanying drawing explanation

Fig. 1 is eccentric bolt schematic diagram;

Fig. 2 is eccentric bolt A-A cut-away view;

Fig. 3 is eccentric bolt B-B cut-away view;

Fig. 4 is bolt shank deformed region figure;

Fig. 5 is cold-heading groove cavity die structure schematic diagram;

Fig. 6 is cold-heading groove die C-C cut-away view;

In figure: the original position at the original position at J workpiece, J1 bolt end, J2 bolt flange, J3 screw rod, J4 screw thread, J5 the first groove, J6 the second groove, J7 homogeneous deformation region, J8 homogeneous deformation region, 1 die sleeve, 2 core rods, 3 die-cushions, 2a undergauge bandwidth, 2b the first groove shrinking angle, 2c the first groove shrinking relief angle end position, 2d the second groove shrinking angle, 2e the second groove shrinking relief angle end position.

The specific embodiment

The utility model embodiment cold-heading stem reducing mould as shown in Figure 5, Figure 6, comprises cold-heading groove punch, cold-heading groove die; Cold-heading groove die comprises die sleeve 1, core rod 2, die-cushion 3; Core rod 2, die-cushion 3 are arranged in die sleeve 1; Two of the undergauge band quantity of cold-heading groove die core rod 2, equal groove quantity; Die core rod 2 undergauge bandwidth are identical; The original position 2b at first undergauge band the first groove shrinking angle is before the original position 2d at the second undergauge band shrinking angle; The first shrinking relief angle end position 2c is after the second shrinking relief angle end position 2e.The non-die undergauge band of cold-heading groove die has radial deformation surplus; The bar portion diameter dimension that guarantees homogeneous deformation region J7 and homogeneous deformation region J8 rises slightly.

2 groove eccentric work piece manufacture processes are as shown in Figure 1, Figure 2, Figure 3 shows: the first step: cold-heading, processes respectively bolt end J1, bolt flange J2, screw rod J3, screw flutes the first groove J5 and the second groove J6 successively at each station of cold headers; Second step: thread rolling, thread rolling machine processes the screw thread on screw rod J3.

As shown in Figure 4: the J3 of bar portion diameter is circumferentially divided into homogeneous deformation region J7 and homogeneous deformation region J8, nonhomogeneous deformation region the first groove J5 and the second groove J6.The first groove J5 in nonhomogeneous deformation region and the second groove J6 Metal Phase flow to homogeneous deformation region J7 and homogeneous deformation region J8 differential speeds; When the bar portion blank of workpiece J is out of shape by cold-heading female mold tool, workpiece J blank is out of shape along undergauge band place local radial cold-heading shrinking, there is the part metal of local reducing distortion, after distortion, form arc groove, before the distortion of workpiece J bar portion, be circular cross-section, after distortion, form multiple-grooved eccentric work piece cross section; The cold-heading of workpiece J blank is out of shape, and forms the first groove J5 and the second groove J6 of the circumferential distribution certain length equating with undergauge band quantity in the bar portion of part.

Clearly, the description of the present embodiment and accompanying drawing is understood the present invention just to better, to the not significantly restriction of the protection domain of claim.Those skilled in the art make simple adjustment or improvement to accompanying drawing and above-described embodiment after reading, still in the protection domain of following claim.

Claims

1. a cold-heading stem reducing mould; Comprise cold-heading groove punch, cold-heading groove die; Cold-heading groove die comprises die sleeve, core rod, die-cushion; Core rod, die-cushion are arranged in die sleeve; It is characterized in that: the undergauge band quantity of cold-heading groove die core rod equals groove quantity; Die core rod undergauge bandwidth is identical; The original position difference at undergauge band shrinking angle, shrinking relief angle end position difference; The non-die undergauge band of cold-heading groove die has radial deformation surplus.

2. cold-heading stem reducing mould according to claim 1, is characterized in that: two of cold-heading groove die undergauge band quantity, and die undergauge bandwidth is identical; The original position at the first undergauge band shrinking angle is before the original position at the second undergauge band shrinking angle; The first shrinking relief angle end position is after the second shrinking relief angle end position.