CN203390140U - Cold-heading and hole-shrinkage mould - Google Patents

Abstract

The utility model discloses a cold heading shrinking die; it includes a cold heading groove punch and a cold heading groove die; the cold heading groove die includes a mold sleeve, a mold core and a mold pad; the mold core and the mold pad are installed In the mold sleeve; the number of reducing bands of the cold heading groove die core is equal to the number of grooves; the width of the reducing band of the die core is the same; the starting position of the narrowing angle of the reducing band is different, and the end position of the narrowing rear angle different. The non-die shrinkage zone of the cold heading groove die has a radial deformation allowance. The advantages are: the cold heading of multi-groove workpieces is realized, the product processing technology is optimized, the production cost is greatly reduced, and it is very suitable for mass production of automotive fasteners.

Description

A kind of cold heading shrinking die

technical field

The utility model belongs to the technical field of cold heading forming, and relates to a cold heading shrinking die, which is especially suitable for manufacturing multi-groove eccentric bolts.

Background technique

Eccentric bolt products are widely used in the adjustment of the chassis of various models of passenger cars. The known processing methods of multi-groove eccentric bolts are: chip milling after the thread rolling process, manual deburring of the milling grooves, low production efficiency and difficult processing. high cost.

The die diameter reduction zone of the existing cold heading reduction die has a cross section perpendicular to the mold axis and is a circle uniformly distributed radially on the same circumference. The metal material that has been uniformly reduced on the surface is uniformly thinned and deformed in the radial direction on the same circumference, and the cross-sectional shape of the part rod is circular before and after deformation.

The known ZL201010501895.9 requires a chamfered and multi-groove bolt forming process, and the processing steps are: the first step of cold heading, and the second step of thread rolling; it is disclosed that the inner sleeve of the mold for cold heading grooves uses two materials with different hardness The material of the punched groove part has a lower hardness than that of other parts of the punched part and has a limited structure with certain toughness. Those skilled in the art prejudicially think that it is difficult to cold-head out grooves with conventional cold-heading dies, and mold fracture will occur; thereby abandoning the scheme design of cold-heading out grooves with conventional cold-heading dies. Simplify the process and overcome the prejudice. Chipless processing of multi-groove eccentric bolts with cold heading reducing die is a subject to be studied.

Contents of the invention

The utility model discloses a cold heading shrinking die, which solves the problems in the prior art that multi-groove eccentric workpieces have chip processing and milling grooves, low production efficiency, high processing cost and the like.

The utility model discloses a cold heading shrinking die, which includes a cold heading groove punch and a cold heading groove die; the cold heading groove die includes a mold sleeve, a mold core, and a mold pad; In the mold sleeve; it is characterized in that: the number of shrinking bands of the die core of the cold heading groove is equal to the number of grooves; the width of the shrinking bands of the die core is the same; The end position of the thin relief angle is different. The non-die shrinkage zone of the cold heading groove die has a radial deformation allowance; the diameter of the rod portion in the uniform deformation area is guaranteed to increase slightly. The workpiece blank is locally radially cold-headed and deformed along the diameter-reducing zone, and the part of the metal that undergoes local diameter-reducing deformation forms circular arc grooves after deformation. Slot eccentric workpiece section.

The cold heading shrinking die disclosed by the utility model has two shrinking bands of the cold heading groove die, and the width of the shrinking bands of the die is the same; the starting position of the first narrowing angle is at the second narrowing band Before the start position of the taper; the end position of the first taper is after the end position of the second taper. the

Working process: The bolt ends, bolt flanges, screws, and screw grooves are sequentially processed at each station of the cold heading machine; the diameter of the rod is divided into a uniform deformation area and a non-uniform deformation area; the cold heading groove mold The number of shrinking bands of the die is equal to the number of grooves; the width of the shrinking bands of the die is the same; the starting position of the narrowing angle of the narrowing bands is different, and the end position of the narrowing back angle is different; the difference between the metal in the non-uniform deformation area and the uniform deformation area Velocity flow; when the rod blank of the part is deformed by the cold heading groove mold, the workpiece blank is locally radially cold heading and deformed along the shrinking zone, and the part of the metal that undergoes local shrinking deformation forms an arc after deformation Groove, the rod of the part is a circular cross section before deformation, and after deformation, a multi-groove eccentric workpiece cross section is formed; the blank of the part is deformed by cold heading, and grooves of a certain length distributed in the circumferential direction equal to the number of reducing bands are formed on the rod of the part. Thread rolling, the thread rolling machine processes the threads on the screw.

The positive effect of the utility model lies in that: the cold heading forming of the multi-groove workpiece is realized, the product processing technology is optimized, the production cost is greatly reduced, and the utility model is very suitable for mass production of automobile fasteners.

Description of drawings

Figure 1 is a schematic diagram of an eccentric bolt;

Fig. 2 is the sectional view of eccentric bolt A-A;

Fig. 3 is the sectional view of eccentric bolt B-B;

Figure 4 is a diagram of the deformation area of the bolt shank;

Figure 5 is a schematic diagram of the structure of the cold heading groove die;

Figure 6 is a C-C sectional view of the cold heading groove die;

In the figure: J workpiece, J1 bolt end, J2 bolt flange, J3 screw rod, J4 thread, J5 first groove, J6 second groove, J7 uniform deformation area, J8 uniform deformation area, 1 mold sleeve, 2 mold cores, 3 Die Pad, 2a Reduced Diameter Strip Width, 2b Start Position of First Groove Taper Angle, 2c End Position of First Groove Taper Back Angle, 2d Start Position of Second Groove Taper Angle, 2e Second Groove Taper Angle Thin relief end position.

Detailed ways

The cold heading shrinking die of the embodiment of the utility model is shown in Figure 5 and Figure 6, including a cold heading groove punch and a cold heading groove die; a cold heading groove die includes a mold cover 1, a mold core 2, a Pad 3; mold core 2 and mold pad 3 are installed in mold sleeve 1; the number of shrinkage bands of cold heading groove die core 2 is two, which is equal to the number of grooves; the width of die core 2 shrinkage bands is the same; The starting position 2b of the first groove reduction angle in the first diameter reduction zone is before the starting position 2d of the second reduction zone reduction angle; the end position 2c of the first reduction relief angle is at the end position of the second reduction relief angle After 2e. The non-die diameter reduction zone of the cold heading groove die has a radial deformation allowance; the diameter of the rod portion of the uniform deformation area J7 and the uniform deformation area J8 is guaranteed to increase slightly.

The manufacturing process of a 2-slot eccentric workpiece is shown in Figure 1, Figure 2, and Figure 3: the first step: cold heading, each station of the cold heading machine sequentially processes the bolt end J1, bolt flange J2, screw J3, The first groove J5 and the second groove J6 of the screw groove; the second step: thread rolling, the thread rolling machine processes the thread on the screw J3.

As shown in FIG. 4 , the rod portion J3 is divided into a uniform deformation zone J7 and a uniform deformation zone J8 , and a first groove J5 and a second groove J6 in a non-uniform deformation zone. The first groove J5 and the second groove J6 in the non-uniform deformation area flow at different speeds relative to the uniform deformation area J7 and the uniform deformation area J8; Partial radial cold heading shrinkage deformation at the radial belt, the part of the metal that undergoes local diameter shrinkage deformation forms arc grooves after deformation, the J rod of the workpiece is a circular cross section before deformation, and forms a multi-groove eccentric workpiece cross section after deformation ; The workpiece J blank is cold-headed and deformed, and the first groove J5 and the second groove J6 with a certain length distributed in the circumferential direction that are equal to the number of shrinking bands are formed on the rod of the part.

Apparently, the description of this embodiment and the accompanying drawings is only for better understanding of the present invention, and does not obviously limit the protection scope of the claims. Those skilled in the art can make simple adjustments or improvements to the drawings and the above embodiments after reading, which still fall within the protection scope of the following claims.

Claims (2)

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.

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