CN202667306U - Forward extrusion structure for improving stress state - Google Patents
Forward extrusion structure for improving stress state Download PDFInfo
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- CN202667306U CN202667306U CN 201220377407 CN201220377407U CN202667306U CN 202667306 U CN202667306 U CN 202667306U CN 201220377407 CN201220377407 CN 201220377407 CN 201220377407 U CN201220377407 U CN 201220377407U CN 202667306 U CN202667306 U CN 202667306U
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- punching head
- forward extrusion
- drift
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Abstract
A forward extrusion structure for improving stress state is characterized that a punching head comprises a tail end, a punching head body and a work end, wherein the periphery of the work end is provided with a work blade band segment of a circular-table-shaped structure, the work blade band segment extends from the end portion of the work end to the punching head body portion, the length of the work blade band segment is 8 millimeters to 10 millimeters, and the diameter of the work blade band segment of the circular-table-shaped structure is 0.3 millimeter larger than that of a punching head segment. A tapered boss with a height of 2 millimeters to 3 millimeters and an angle of 45 degrees is arranged on the end face of the work end. A tapered transitional face with the angle of 2 degrees is arranged on a portion between the root portion of the tapered boss and the periphery portion of the work blade band segment of the circular-table-shaped structure. The diameter of the root portion of the tapered boss is 0.7 time that of the periphery portion of the work blade band segment of the circular-table-shaped structure. The forward extrusion structure is designed specific to a forward extrusion punching head research in cold extrusion forming, serves as a forward extrusion punching head in the cold extrusion forming, can effectively solve the problem of punching head failures due to generation of circular crack on the work end portion during production of the forward extrusion punching head, prolongs service life of the punching head, and saves production cost.
Description
Technical field
The utility model relates to and belongs to the metal forming processing technique field, relates to specifically a kind of punch structure form that can improve suffered stress state when the forward extrusion drift is worked in the cold extrusion.
Technical background
Be to affect the key factor that can cold extrusion production be carried out smoothly die life, also is related to precision and the quality of cold-extruded part.The failure mode of mould mainly contains plastic deformation, cracks in the cold extrusion, fracture, concentrated wear, part fall piece etc.Mould structure is very large on the impact of mould stress, and is stressed even, reasonable when reasonably mould structure can make mold work, is difficult for unbalance loading, and stress is concentrated little.
In cold extrusion, forward extrusion is widely used as a kind of main forming technology.And in the production reality, also there is the problem that can not continue to use because of inefficacy in the forward extrusion drift, and its failure mode mainly contains and cracks and fracture etc., the form that wherein cracks has multiple, and annular or semi-circular crackle (seeing accompanying drawing 1) that the drift operative end surface produces near cylindrical are a kind of main failure modes, this crackle fecund is born in the annular region at drift cylindrical 3～6mm place, the main cause of its generation is, end face is subjected to pressure at right angle (seeing accompanying drawing 2) to produce strain during drift work, drift is pushed by interior metal near the cylindrical position, to outer wall direction strain, and drift cylindrical wall does not have corresponding equilibrant force, after rushing first work shape stroke end, this distortional stress disappears again.Drift is through one section use like this, and this position just produces fatigue crack under the effect of alternate stress, and drift was lost efficacy very soon.
Summary of the invention
The purpose of this utility model provides a kind of forward extrusion nose of punch version rational in infrastructure for existing weak point in the above-mentioned prior art just, the stress of work end effectively solves the problem that forward extrusion punch end face circumferential crack produces when adopting the forward extrusion drift of this version can improve its work.
The purpose of this utility model can realize by following technique measures:
The forward extrusion punch structure that improves stress state of the present utility model comprises tail end, drift body and working end; Described working end cylindrical is provided with the work land section that the length of partly being extended to the drift body by the end, working end is the ring platform shape structure of 8～10mm, and the diameter of the work land section of described ring platform shape structure is greater than drift figure diameter 0.3mm; It highly is that 2～3mm, angle are 45 ° conical boss that end face in described working end arranges one, and it is 2 ° the excessive face of circular cone that conical boss root to the work land excircle part of encircling platform shape structure is provided with angle; Wherein, described conical boss root diameter (RD) is 0.7 times of the work land section outside diameter of ring platform shape structure.
Knuckle between the table top of conical boss described in the utility model and the conical surface of conical boss and conical boss root and angle are that the knuckle between 2 ° the excessive face of circular cone is R1.5mm.
The beneficial effects of the utility model are as follows:
Because the utility model adopts the version design of forward extrusion drift work end, end stress state in the time of can changing drift work, produce the compression of a sensing drift inside, thereby can effectively solve the problem that forward extrusion drift operative end surface circumferential crack produces, improve drift service life, save production cost.
Description of drawings
Fig. 1 is forward extrusion punch end face circumferential crack schematic diagram.
The arrow indication is the circumferential crack that produces in the flat punch use procedure among the figure.
Fig. 2 is the stressed schematic diagram of common planar end surface forward extrusion drift.
Fig. 3 is forward extrusion punch structure form full figure of the present utility model.
Fig. 4 is the stressed schematic diagram in forward extrusion drift work end of the present utility model.
Fig. 5 is forward extrusion punch structure form work of the present utility model end enlarged drawing.
The specific embodiment
The utility model further describes below with reference to embodiment (accompanying drawing):
Such as Fig. 3, shown in Figure 5, drift described in the utility model mainly comprises tail end 1, drift body 2 and working end 3 three parts; Described working end cylindrical is provided with the work land section that the length L 2 of partly being extended to the drift body by the end, working end is the ring platform shape structure of 8～10mm, and the diameter d 1 of the work land section of described ring platform shape structure is greater than drift figure diameter d 3 0.3mm; It is that 2～3mm, angle are 45 ° conical boss that end face in described working end arranges a height L1, and it is 2 ° the excessive face of circular cone that conical boss root to the work land excircle part of encircling platform shape structure is provided with angle; Wherein, described conical boss root diameter (RD) d2 is 0.7 times of the work land section outside diameter d1 of ring platform shape structure.
Knuckle between the table top of conical boss described in the utility model and the conical surface of conical boss and conical boss root and angle are that the knuckle between 2 ° the excessive face of circular cone is R1.5mm.
Specific works principle of the present utility model is: when drift is worked, the set boss of punch end face and the conical surface are subject to the reaction force P of blank metal, and this masterpiece is when being used on the taper seat, can produce the component F2 of a sensing drift inside, consist of the compression of pointing to drift inside, thereby can change stress state near the annular region of drift cylindrical, the generation (referring to Fig. 4) that effectively solves end face ring shape crackle.In addition, it highly is the work land of the ring platform shape structure of 8～10mm that the working end cylindrical arranges one, can reduce the contact area of drift cylindrical and die inwall in the drift course of work, can reduce because of fractureing that the drift clamping is not just bringing.
Claims (2)
1. forward extrusion punch structure that improves stress state, it is characterized in that: described drift comprises tail end, drift body and working end; Described working end cylindrical is provided with the work land section that the length of partly being extended to the drift body by the end, working end is the ring platform shape structure of 8～10mm, and the diameter of the work land section of described ring platform shape structure is greater than drift figure diameter 0.3mm; It highly is that 2～3mm, angle are 45 ° conical boss that end face in described working end arranges one, and it is 2 ° the excessive face of circular cone that conical boss root to the work land excircle part of encircling platform shape structure is provided with angle; Wherein, described conical boss root diameter (RD) is 0.7 times of the work land section outside diameter of ring platform shape structure.
2. the forward extrusion punch structure that improves stress state according to claim 1 is characterized in that: the knuckle between the table top of described conical boss and the conical surface of conical boss and conical boss root and angle are that the knuckle between 2 ° the excessive face of circular cone is R1.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220377407 CN202667306U (en) | 2012-08-01 | 2012-08-01 | Forward extrusion structure for improving stress state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220377407 CN202667306U (en) | 2012-08-01 | 2012-08-01 | Forward extrusion structure for improving stress state |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202667306U true CN202667306U (en) | 2013-01-16 |
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ID=47488240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220377407 Withdrawn - After Issue CN202667306U (en) | 2012-08-01 | 2012-08-01 | Forward extrusion structure for improving stress state |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202667306U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102744283A (en) * | 2012-08-01 | 2012-10-24 | 郑州机械研究所 | Direct extrusion punch structure for improving stress state |
-
2012
- 2012-08-01 CN CN 201220377407 patent/CN202667306U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102744283A (en) * | 2012-08-01 | 2012-10-24 | 郑州机械研究所 | Direct extrusion punch structure for improving stress state |
| CN102744283B (en) * | 2012-08-01 | 2015-03-11 | 郑州机械研究所 | Direct extrusion punch structure for improving stress state |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130116 Effective date of abandoning: 20150311 |
|
| RGAV | Abandon patent right to avoid regrant |