CN2439344Y

CN2439344Y - Integral key cold extruding forming die

Info

Publication number: CN2439344Y
Application number: CN 00241948
Authority: CN
Inventors: 朱伟成; 徐成林; 王秋菊; 李文成
Original assignee: CHANGCHUN INST OF AUTOMOBILE MATERIALS
Priority date: 2000-06-30
Filing date: 2000-06-30
Publication date: 2001-07-18
Anticipated expiration: 2010-06-30

Abstract

The utility model discloses an internal integral key cold extrusion forming die. The front end of a male die 3 is provided with a smooth straight bar section to cause the male die to accurately enter into component holes processed to ensure the precision of part teeth. When the utility model is in operation, the male die enters the component holes which is arranged in a female die 4 to carry out extrusion; after the operation, the male die moves up away from work pieces, and the work pieces are ejected out from the female die under the action of an ejector. The utility model can process internal integral keys of through hole components and internal integral keys of blind holes. The utility model has the advantages of low cost, high productive efficiency, high tooth strength, high tooth surface smoothness, etc.

Description

Internal spline cold extrusion forming mould

The utility model relates to the precision forging shaping dies, especially a kind of internal spline cold extrusion forming mould.

The processing internal spline has two kinds of methods at present, and for the internal spline of processing through-hole parts, the general employing drawn the tooth processing method.And, adopt the processing method of gear shaping to the internal spline of processing blind hole part more.No matter use any processing method, all the call for bids lattice are than expensive special purpose machine tool and dedicated tool.Cutter often takes place to beat the tooth phenomenon aborning, and production efficiency is also lower, Gu and increased the cost of processing parts.In addition, because above-mentioned processing method all is that bits processing is arranged, part to be processed flank of tooth metallic fiber is cut off, Gu and having reduced the intensity of tooth, tooth surface fineness is also lower.

The purpose of this utility model provides that a kind of part processing cost is low, production efficiency is high, tooth intensity height, the flank of tooth are highly polished a kind ofly can process the through-hole parts internal spline, but the also internal spline cold extrusion forming mould of processing blind hole part internal spline.

To achieve these goals, the utility model part to be processed is contained in the die hole.The punch front end has a smooth straight bar part, and during work, straight bar part at first enters part to be processed and plays correcting and positioning action, and the tooth on the punch enters part to be processed and carries out extrusion molding then, thereby has guaranteed the precision of part to be processed profile of tooth.In order to prevent that part to be processed is out of shape in extrusion process, die hole and part to be processed cylindrical adopt little matched in clearance.

Below in conjunction with accompanying drawing the specific embodiment of the present utility model is described in further detail.

Fig. 1 is the structural representation of utility model; Fig. 2 is a punch working portion schematic diagram; Fig. 3 is the punch tooth A of a portion partial enlarged drawing.As shown in Figure 1, the utility model is made up of upper plate 1, fixed head 2, punch 3, stripper 4, die 5, backing plate 6, backing-out punch 7, lower shoe 8 etc.Punch 3 is loaded on upper plate 1 by fixed head 2, and die 5 is loaded on the lower shoe 8 by backing plate 6, and backing-out punch 7 is contained in the hole of backing plate 6 and lower shoe 8.In punch working portion schematic diagram shown in Figure 2, punch front end straight bar part diameter d ₁, length h ₁, the rear portion diameter d ₂Equidimension is decided according to the concrete size of part to be processed, and h ₁=1.5d ₁, h ₂=1.5d ₁, α ₂=20 °～45 °.In Fig. 3 punch tooth A of portion partial enlarged drawing, push in order to guarantee flank of tooth quality and the punch spline tooth to be entered in the part to be processed hole smoothly, at tine length direction two chamfer α ₁, and α ₁=15 °～45 °, the length h of tooth decides on the part to be processed internal spline length, and h=10～20mm.When work piece is the blind hole internal spline, can suitably reduce h ₁Size.

During work, upper plate 1 is contained on the press ram, lower shoe 8 is contained on the press bench face, punch 3 pushes with moving up under the slide block in the hole in piece part that is contained in die 5 holes, after impulse stroke finished, punch 3 was with moving on the slide block, and workpiece ejects die by backing-out punch 7 and stays on the punch 3, along with slide block moves on further, workpiece is backed off by stripper.

Claims

1, a kind of internal spline cold extrusion forming mould is made up of upper plate 1, fixed head 2, punch 3, stripper 4, die 5, backing plate 6, backing-out punch 7, lower shoe 8 etc., and it is characterized in that: punch 3 front ends have a smooth straight bar part.

2, internal spline cold extrusion forming mould according to claim 1 is characterized in that: punch 3 tooth length are 10～20mm.