CN102773299A

CN102773299A - Cross-axle cold extrusion die

Info

Publication number: CN102773299A
Application number: CN2011101228670A
Authority: CN
Inventors: 金佩瑾
Original assignee: Ningbo Jiabijia Industry & Trade Co Ltd
Current assignee: Ningbo Jiabijia Industry & Trade Co Ltd
Priority date: 2011-05-10
Filing date: 2011-05-10
Publication date: 2012-11-14

Abstract

A cross-axle cold extrusion die comprises an upper die, a lower die and positioning pins arranged between the upper die and the lower die, wherein the upper and lower sides of a central cavity of upper and lower modules are provided with push rod chambers; the periphery of the central cavity is provided with a plurality of radial axle head cavities; and each of the axle head cavities close to the central cavity is provided with a necking ring. The cross-axle cold extrusion die is characterized in that end parts of the axle head cavities are provided with chamfering surfaces which are connected to the necking rings. The chamfering surfaces are arranged on the end parts of the axle head cavities, so there is no need to carry out the chamfering treatment of a cross axle once molded through cold extrusion, thereby the production operation is reduced, the working efficiency is improved, and simultaneously a raw material is saved. The structure of the cross-axle cold extrusion die is reasonable, so the cross-axle cold extrusion die has the advantages of improvement of the production efficiency and the raw material utilization rate, cost reduction, stable product quality, and high product precision on the premise that the service life of the die is long.

Description

A kind of cross axle cold extrusion die

Technical field

The present invention relates to a kind of diel, be specifically related to a kind of structure that is exclusively used in the cross axle cold extrusion molding mould of universal joint.

Background technology

Traditional processing method is a cross axle through behind forge hot or the cold-extrusion shaping, and four spindle noses of product are to accomplish through the mode that punch press washes upside down angle or Vehicle Processing chamfering.But these two kinds of methods all exist defective separately.The meeting that washes upside down the angle through punch press produces two kinds of common deficiencies.The first, the junction of the chamfering root and the diameter of axle can be protruding, in follow-up mill process, can produce and beat, and causes diameter of axle circularity over tolerance, also needs frequent reconditioning emery wheel simultaneously, and production efficiency is low; The second, because the diameter of axle of the error of frock or product is big or small, can produce the chamfering non-uniform phenomenon.Also can produce two kinds of common deficiencies through the Vehicle Processing chamfering.The first, the Vehicle Processing product can produce the bad of fineness, and this also is the common fault of machining; The second, also can produce the chamfering non-uniform phenomenon because of the error of frock or the diameter of axle size of product.

The stock utilization that just should be traditional handicraft is low, manufacturing procedure is complicated and the defective of low precision; In order to improve stock utilization; Reducing manufacturing procedure, conventional molds is improved, is 89102227.9 Chinese patent " blank of cross axle moulding process and mould " like the patent No.; Adopt warm extrusion forming process at first bar to be heated to 500 ℃～1200 ℃; Bar after will heating is then put into the hole, material road of the extrusion die that is installed on the forcing press, starts forcing press, is contained in extrusion head on the press ram and bar is pressed into moulding in the die cavity of extrusion die.It is to adopt hot extrusion molding, but energy consumption is big, production cost is high and production environment and noise do not meet environmental requirement.The cold extrusion of employing mode production and processing universal-joint cross trunnion is also arranged at present; Corresponding mould has also appearred; Like the patent No. is the Chinese patent " cross axle cold extrusion die " of 01239582.X; Comprise upper die and lower die and be located at alignment pin therebetween, it is characterized in that the said upper and lower sides of the central cavity of module up and down is provided with the push rod chamber; Be outside equipped with several radial spindle nose die cavities in central cavity, and the spindle nose die cavity of nearly central cavity side is provided with the necking down ring.This cross axle cold extrusion die has had large increase on stock utilization and production efficiency, and easy to process, but the spindle nose of the cross axle after the moulding also need pass through follow-up chamfered ability final molding, so not only waste material but also cumbersome.

Summary of the invention

Technical problem to be solved by this invention is that the cross axle cold extrusion die that need not chamfered after a kind of rational in infrastructure, moulding is provided to the above-mentioned state of the art.

The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of cross axle cold extrusion die; Comprise mold, bed die and be located at alignment pin therebetween; Be provided with the push rod chamber at the upper and lower sides of the central cavity of module up and down, be provided with several radial spindle nose die cavities in the central cavity periphery, and the spindle nose die cavity of nearly central cavity side be provided with the necking down ring; The end that it is characterized in that said spindle nose die cavity is provided with fillet surface, is connected on the necking down ring.

Do not produce boss for solving its chamfering root and diameter of axle junction, the difference that the internal diameter of necking down ring and spindle nose die cavity is set is 0.04～0.06mm.The fillet surface afterbody adopts and does not seal simultaneously, is open type, to guarantee that material has enough distance of flow in mould, prevents product dieback in mould.

As improvement, the angle of said fillet surface and said spindle nose die cavity periphery is＜45 °.

At last, said spindle nose die cavity is four, is the periphery that crosswise is symmetricly set on central cavity.

Compared with prior art; The invention has the advantages that: the end at the spindle nose die cavity is provided with fillet surface; Just need not to carry out again chamfered through the one-time formed cross axle of cold extrusion like this, reduced production process, improved operating efficiency; Avoid washing upside down the weak point of angle and Vehicle Processing chamfering, also practiced thrift raw material simultaneously.Structure of the present invention is more reasonable, guaranteeing to have improved utilization rate of raw materials under the prerequisite of mould than the long life, has reduced cost, and has improved production efficiency, constant product quality, precision height.

Description of drawings

Fig. 1 is the structural representation of the mold of the embodiment of the invention;

Fig. 2 is the structural representation of the bed die of the embodiment of the invention;

Fig. 3 is the vertical view of Fig. 1.

The specific embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

Like Fig. 1-3 signal, a kind of cross axle cold extrusion die comprises mold A, bed die B and is located at alignment pin therebetween; Select for use carbide alloy or high speed steel material to make upper and lower module 1,1 '; Be shaped on central cavity 2 in upper and lower module 1,1 ' center, central cavity 2 peripheries are shaped on four and are the symmetrically arranged spindle nose die cavity 3 of crosswise, and the spindle nose die cavity 3 of nearly central cavity side is provided with the necking down ring; And be provided with fillet surface 31 in the end of spindle nose die cavity 3; Be connected on the necking down ring 32, do not produce boss for solving its chamfering root and diameter of axle junction, the difference that the internal diameter of necking down ring and spindle nose die cavity is set is 0.04～0.06mm.The fillet surface afterbody adopts and does not seal simultaneously, is open type, to guarantee that material has enough distance of flow in mould, prevents product dieback in mould, and said fillet surface 31 is＜45 ° with the angle of said spindle nose die cavity 3 peripheries; Be provided with pre-tightening sleeve 6 and overcoat 5 in upper and lower module 1,1 ' the outside; On pre-tightening sleeve 6, be provided with dowel hole 8; The inboard of pre-tightening sleeve 6 and the bottom of module are provided with pad 7; And be provided with the push rod chamber of running through 4 in the center of module and pad 7, constitute mold A and the bed die B that is mutually symmetrical basically thus, and be separately positioned on the bottom plate and portable plate of forcing press.

During production, the round steel that adopts steel plant to produce is a raw material, the softening processing of process successively, phosphatization lubricated after the blanking; The blanking pole is being put into push rod chamber 4, and along with forcing press drives the mold pressed downward, the blanking pole backs down push rod and counterdie pressing; Under the cooperation of dowel hole 8 and alignment pin, be that upper and lower module 1,1 ' closely fastens simultaneously, the forcing press continuation is descending; By push rod extruding blanking pole, make it in mould, press to spindle nose die cavity 3, and one-shot forming form fillet surface 31 in the spindle nose end from central cavity 2; The spindle nose of the cross axle after the moulding just need not to carry out chamfered again like this, has reduced production process, has improved operating efficiency; Also practice thrift raw material simultaneously, reduced cost, and pushed cross axle long service life, the steady quality of coming out.

Claims

1. cross axle cold extrusion die; Comprise mold, bed die and be located at alignment pin therebetween; Be provided with the push rod chamber at the upper and lower sides of the central cavity of module up and down, be provided with several radial spindle nose die cavities in the central cavity periphery, and the spindle nose die cavity of nearly central cavity side be provided with the necking down ring; The end that it is characterized in that said spindle nose die cavity is provided with fillet surface, is connected on the necking down ring.

2. cross axle cold extrusion die according to claim 1, the difference that it is characterized in that the internal diameter of said necking down ring and spindle nose die cavity is 0.04～0.06mm, the fillet surface afterbody is adopted open type simultaneously.

3. cross axle cold extrusion die according to claim 1 is characterized in that the angle of said fillet surface and said spindle nose die cavity periphery is＜45 °.

4. according to claim 1 or 2 or 3 described cross axle cold extrusion dies, it is characterized in that said spindle nose die cavity is four, be the periphery that crosswise is symmetricly set on central cavity.