CN2485128Y

CN2485128Y - Cold extruding die for spider

Info

Publication number: CN2485128Y
Application number: CN01239582U
Authority: CN
Inventors: 汪爱兴; 齐长红
Original assignee: Wanxiang Qianchao Co Ltd
Current assignee: Wanxiang Qianchao Co Ltd
Priority date: 2001-05-27
Filing date: 2001-05-27
Publication date: 2002-04-10
Anticipated expiration: 2011-05-27

Abstract

The utility model relates to a cold extruding die for spider, which is provided with an upper roof bar on the outside of the central cavity of the upper and lower dies, and a plurality of radiating shaft head type cavities is arranged on the outside of the central cavity, and a shank reducing ring is positioned on the shaft head shape cavity near to the central cavity, thereby the utility model has the advantages that: the squeezing friction is greatly reduced, and the quality for the blanks is stable, and the internal quality is obviously improved with high precision and stable size, and the rough degree on the surface is greatly reduced, and the utility model improves the use rate of the raw material, reduces the processing quantity, reduces the rejection ratio of the after processing and improves the working efficiency.

Description

The cross axle cold extrusion die

The utility model relates to a kind of diel, especially relates to a kind of structure that is exclusively used in the cross axle cold extrusion molding mould of universal joint.

In order to have improved raw-material utilization rate, reduce processing capacity, Hubei Universal-Joint Factory once applied for " blank of cross axle moulding process and mould " by name utility model patent (application number 89102227.9) it be at first bar is heated to certain temperature, put into the extrusion die extrusion modling then, changed the method that original loose tool forges the processing blank of cross axle, though improved raw-material utilization rate, reduced processing capacity etc.But still exist need to heat bar about 800 ℃ to 1000 ℃ after, hot extrusion molding again, consumes energy is big, production environment is relatively poor, comparatively defective such as complexity of technology.

On the other hand, cold extrusion is a kind of comparatively advanced technology, but having relatively high expectations to mould.For this reason, people had once done many effort to this.For example, that Yano Engineering Co Ltd of Japan had once applied for was by name " assembling die that extrusion process is used and extruding method thereof,, patent of invention (application number 93103180.X).It mainly processes support holes in the core side, and to overhanging this support holes of passing, this sells on the supporting end face of two overhang brackets in the locating hole of core positioning module fulcrum post with its two end, core is inserted again and is positioned in the positioning module and constitutes a formpiston.Though improved the processing of core slightly, make it more or less freely, simultaneously, but still it is comparatively complicated to exist mould structure, the more high deficiency of cost of manufacture.

Goal of the invention of the present utility model is to overcome the deficiencies in the prior art, provides a kind of rational in infrastructure, and frictional force is less in the cold extrusion process, and shaping block surface slickness cross axle cold extrusion die preferably.

Goal of the invention of the present utility model mainly is achieved by following technical proposals: the described 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.For example, three forked, cross axle shape etc., described necking down ring is arranged between central cavity and the spindle nose die cavity, and the internal diameter of the width of its setting and spindle nose die cavity and the difference of necking down ring need decide according to size, the material of products such as cross axle.In other words, described necking down ring is by behind two in the upper and lower mould die cavity semicircular ring matched moulds that slightly protrude from the die cavity body, form a ring body that slightly shrinks, make spindle nose by the cold extrusion base substrate of its moulding, avoided in the follow-up cold extrusion process and mould shaft head dummy chamber wall between brute force friction etc.

A kind of comparatively suitable structure parameter is: the width of described necking down ring is 2-5mm, and the internal diameter in its outboard shafts head dummy chamber and the difference of necking down ring are 0.02-0.08mm.When if the narrower or difference of described necking down ring is big, its intensity susceptible to, and be easy to produce the vestige of extruding at the spindle nose base portion; On the contrary, if necking down ring broad or both differences are hour, the intended purposes of the frictional force when reducing extruding will be affected.

In addition, in order to improve the overall construction intensity of base substrate, the joint face between described central cavity and each the spindle nose die cavity is the spherical calotte body.

Described spindle nose die cavity has four, and is the periphery that crosswise is arranged symmetrically in central cavity.

Therefore, the utlity model has following characteristics: 1. because the spindle nose die cavity is provided with the structure of necking down ring, the frictional resistance of cold steel when die for molding is greatly reduced, for it has created the one-time formed condition of employing cold extrusion, thereby the minimizing operation improves work efficiency greatly; 2. guaranteeing to have improved the dimensionally stable of blank of cross axle under the prerequisite of mould than the long life, reduce percent defective, improved raw-material utilization rate, reduced processing capacity, reduced the percent defective of following process; 3. defective such as eliminated that cross axle base portion or near the stress that is produced by metalworking, cutting are concentrated, and make blank quality stable, inherent quality obviously improves, the precision height, and surface roughness greatly reduces.

Accompanying drawing 1 is the structure cutaway view of a kind of counterdie of the present utility model;

Accompanying drawing 2 is structure cutaway views of a kind of patrix of the present utility model;

Accompanying drawing 3 is that the K of accompanying drawing 1 is to view.

Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.

Embodiment: select for use carbide alloy or high speed steel material to make module 3 up and down, adopt existing mould making process, be shaped on four of central cavity 6 by designing requirement in the district in the central and be the spindle nose die cavities 4 that cross is arranged, and between to be provided with width be necking down ring 5 about 3mm; The diameter of described necking down ring 5 is than the little 0.08mm of diameter of spindle nose die cavity 4, the promptly monolateral spindle nose die cavity 4 about 0.04mm that protrude from.Arranged outside in module 3 has pre-tightening sleeve 10 and overcoat 11; Be provided with dowel hole 15 on the coat, its bottom inboard and module 3 is provided with backing plate 13; And being provided with the push rod chamber of running through 12 in the center of module 3 and backing plate 13, it is built-in with push rod and brute spring; Constitute mold and the bed die that is mutually symmetrical substantially thus, and be separately positioned on the head and support of forcing press.

During production, columniform blank steel column is put into ejector pin of die set chamber 12, when progressively depressing along with forcing press driving mold, the blank steel column backs down push rod (compression spring) and counterdie pressing, and under the cooperation of dowel hole 15 and alignment pin, two moulds closely fasten about making, forcing press continues operation downwards then, by push rod extruding steel column base substrate, make its in mould through central cavity 6 through necking down ring 5, press to spindle nose die cavity 4.Because the diameter of spindle nose die cavity 4 is slightly less than necking down ring 5, so in the process of cross axle spindle nose extrusion modling, spindle nose and the 4 no strong frictions (extrusion friction mainly concentrates on positions such as necking down ring 5) of spindle nose die cavity, not only obviously reduce crush resistance, improve die life, and necking down ring 5 is reasonable in design, can not occur comparatively significantly impression mark on cross axle.Therefore, it is attractive in appearance that the workpiece that uses this mould to squeeze out has moulding, and the mould molding resistance is little, work efficiency height, characteristics such as die life is long, and workpiece strength height, quality are good, only process on a small quantity in the spindle nose end, and waste of material is few.

Claims

1. a cross axle cold extrusion die comprises upper die and lower die and the alignment pin of being located at therebetween, it is characterized in that the described upper and lower sides of the central cavity (6) of module (3) up and down is provided with push rod chamber (12); Be outside equipped with several radial spindle nose die cavities (4) in central cavity (6), and the spindle nose die cavity (4) of nearly central cavity side is provided with necking down ring (5).

2. cross axle cold extrusion die according to claim 1, the width that it is characterized in that described necking down ring (5) is 2-5mm, the internal diameter in its outboard shafts head dummy chamber (4) and the difference of necking down ring are 0.02-0.08mm.

3. cross axle cold extrusion die according to claim 1 is characterized in that the joint face (7) between described central cavity (6) and each the spindle nose die cavity (4) is the spherical calotte body.

4. cross axle cold extrusion die according to claim 2 is characterized in that the joint face (7) between described central cavity (6) and each the spindle nose die cavity (4) is the spherical calotte body.

5. according to the described cross axle cold extrusion die of claim 1 to 4, it is characterized in that described spindle nose die cavity (4) has four, and be the periphery that crosswise is arranged symmetrically in central cavity (6).