CN102773300A - Rigid alloy cold extrusion die with irregular cavity - Google Patents

Abstract

The invention discloses a rigid alloy cold extrusion die with an irregular cavity. The rigid alloy cold extrusion die comprises a die core, a pre-stress inner ring coated at the outer side of the die core, and a pre-stress outer ring coated at the outer side of the pre-stress inner ring; and an annular working belt with a diameter of 3-5 mm is arranged in the die cavity inside the die core. Compared with the prior art, the rigid alloy cold extrusion die has the advantages as follows: a cavity structure is combined by using three layers of pre-stress, so that an extrusion force is reduced; the annular working belt with the diameter of 3-5 mm is arranged inside the die cavity, so that the impact of the die is reduced, and the service life of the die is further prolonged; and the pre-stress inner ring and the pre-stress outer ring are made of high-speed steel, and the die core is made of rigid alloy, so that the anti-abrasion property is strong.

Description

Irregular cavity carbide alloy cold extrusion die

Technical field

The present invention designs a kind of cold extrusion die, particularly a kind of irregular cavity carbide alloy cold extrusion die.

Background technology

Because it is big that cold-extrusion technology has extruding force, high to the cold extrusion die requirement, usually adopt two layers of prestressing force cover or three layers of prestressing force mold structure; Core material often adopts high-speed steel; The length of extruding work zone often is greater than the length of cold-extruded part, owing on whole extruded wall, have frictional force and resistance of deformation, makes extruding force very big; Can't be guaranteed die life, and mould wear out failure very easily.

Summary of the invention

In order to overcome above defective, the invention provides a kind of die life of high, wear-resistant novel cold extrusion die

For realizing above-mentioned purpose, adopt following technical scheme:

A kind of irregular cavity carbide alloy cold extrusion die, it comprises core rod, be coated on the prestressing force inner ring in the core rod outside and be coated on the prestressing force outer ring in the prestressing force inner ring outside, in the inner mold cavity of core rod, is provided with the annular working band of 3-5mm.

Described prestressing force inner ring 2 adopts high-speed steel to process with prestressing force outer ring 3; Described core rod 1 adopts carbide alloy to process.

The hardness of described core rod 1 is 90-92HRA.

The present invention's advantage compared with prior art is: adopt three layers of prestressing combination die structure, improved mould strength, in mold cavity, be provided with the annular working band of 3-5mm, reduced the impulsive force to mould, further prolonged the service life of mould; Prestressing force inner ring and prestressing force outer ring adopt high-speed steel to process, and core rod adopts hard alloy to process, and abrasion resistance is strong.

Description of drawings

Fig. 1 is a vertical view of the present invention;

Fig. 2 is the cutaway view of Figure 1A-A.

The specific embodiment

In order better technical scheme of the present invention to be understood, technical scheme is elaborated below in conjunction with accompanying drawing.

Like Fig. 1, irregular cavity carbide alloy cold extrusion die shown in Figure 2; It comprises core rod 1, be coated on the prestressing force inner ring 2 in core rod 1 outside and be coated on the prestressing force outer ring 3 in prestressing force inner ring 2 outsides; Wherein, carbide alloy core rod 1 respectively has 0.3% to 0.7% the magnitude of interference with prestressing force inner ring 2, prestressing force inner ring 2 with the prestressing force outer ring, in the mold cavity of core rod 1 inside, is provided with the annular working band 4 of 3-5mm; The geomery of work zone 4 is identical with the cold-extruded part geomery; Above work zone 4, be designed with into modular angle, angle be 15 the degree to 30 the degree, be beneficial to workpiece and get into die cavity smoothly.

The present invention puts it in the die sleeve in use, and the top adopts gland to fix, and extrusion is put into into die orifice, through the forcing press moulding.

Those of ordinary skill in the art will be appreciated that; Above enforcement only is to be used for explaining the present invention; And be not to be used as qualification of the present invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention above-described variation, modification.

Claims (4)

1. irregular cavity carbide alloy cold extrusion die; It is characterized in that; It comprises core rod (1), be coated on the prestressing force inner ring (2) and the prestressing force outer ring (3) that is coated on prestressing force inner ring (2) outside in core rod (1) outside, in the mold cavity of core rod (1) inside, is provided with the annular working band (4) of 3-5mm.

2. irregular cavity carbide alloy cold extrusion die according to claim 1 is characterized in that: described prestressing force inner ring (2) and prestressing force outer ring (3) adopt high-speed steel to process.

3. irregular cavity carbide alloy cold extrusion die according to claim 1 is characterized in that: described core rod (1) adopts carbide alloy to process.

4. irregular cavity carbide alloy cold extrusion die according to claim 3 is characterized in that: the hardness of described core rod (1) is 90-92HRA.

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