CN1031628C - Process for local radial contraction for metal tube - Google Patents
Process for local radial contraction for metal tube Download PDFInfo
- Publication number
- CN1031628C CN1031628C CN 93120472 CN93120472A CN1031628C CN 1031628 C CN1031628 C CN 1031628C CN 93120472 CN93120472 CN 93120472 CN 93120472 A CN93120472 A CN 93120472A CN 1031628 C CN1031628 C CN 1031628C
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- CN
- China
- Prior art keywords
- metal tube
- mould
- cross
- section
- section line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The present invention relates to a technology for leading a metal pipe to locally and radially retract. A metal pipe is placed in a fixing lower mould cavity and is punched by aligning an upper mould which is connected to a punching head of a punching machine to a lower mould, so the metal pipe in the mould cavity is formed in a master form mode. The method of the present invention overcomes the defects of special equipment using, complex technology and high production cost of the existing technologies, such as liquor expansion, air expansion, rotary extrusion, etc. The present invention has the advantages of simple and convenient processing method, easy operation and high rate of finished products, and the product quality is guaranteed.
Description
The invention belongs to metal tube compression molding technology field.
Product behind the local undergauge of metal tube is for building industry and furniture manufacturing industry adopt in a large number, but to the ways and means difference of metal tube part undergauge, production cost of products and quality differed widely.A kind of mould pressing process that makes the local undergauge of metal tube is disclosed among the patent document CN1057217A, if but the mould design is improper, and metal tube still can crack wrinkling in the undergauge process.
Purpose foot of the present invention provides a kind of die apparatus that can implement above-mentioned documents technology.
Technical scheme of the present invention is as follows:
Mould is divided into upper and lower mould, and the die cavity of upper and lower mould is a symmetric shape, and die cavity by the character that vertical formed mould cross-section line with axial line is had is: 1. the air line distance of two-end-point is more than 1.1 times of metal tube green diameter; 2. the center be one section with the metal tube moulding after the identical circular arc of curvature.One section line (ac a ' c ') between outer end points of mould cross-section line and circular arc end points can be involute The initial segment shape, and the circular arc action h of this cross-section line center is less than the radius of this circular arc.
A, the present invention have following advantage compared with prior art:
1, must not adopt special equipment, production cost is low;
2, process is simple, easy operating;
3, the metal tube undergauge is even, smooth surface, no wrinkle;
4, yield rate improves 25% than prior art.
Further set forth content of the present invention below in conjunction with Figure of description and embodiment:
Fig. 1 is a longitudinal sectional view of the present invention;
Fig. 2 is the view along die cavity axial line A-A cross section;
Fig. 3 is the letter meaning view of A-A section.
Shown by reference numeral is: 1-metal tube, 2-mold, 3-bed die, 4-drift, 5-workbench
Be made up of mold 2 and bed die 3 by the diel of the metal tube 1 of punching press, the die cavity of upper and lower mould is symmetry fully, and bed die is fixed on earlier on the workbench 5 of punch press, and metal tube 1 is placed in the bed die die cavity.Mold 2 is connected on the drift 4 of punch press, and upper and lower die cavity will be aimed at fully.During work, drift drives patrix 2 and carries out punching press downwards, metal tube pattern and reach the purpose that local radial is shunk under the extruding of upper and lower die cavity.
In the punching press means, the design of upper and lower mould cavity matches and seems very important.The present embodiment mold materials is selected steel for use No. 45, utilizes electric spark or profiling machine to dig die cavity, and whole die cavity is the curved surface of a cylindricality, forms through upper and lower symmetrical closure.
Die cavity by the characteristics of vertical formed mould cross-section line with axial line is: the air line distance of two-end-point aa ' is more than 1.1 times of metal tube green diameter; The center of this cross section be one section with the metal tube moulding after the identical circular arc of curvature.And, one section line ac or a ' c ' between outer end points of this cross-section line and circular arc end points can be involute The initial segment shape, the circular arc action h of this cross-section line center is less than the radius of this circular arc, in order that make metal tube when distortion, enough strain spaces be arranged, make metal tube be subjected to one section of one-shot energy pattern moulding whenever.
During concrete operations, every impact once, the operator rotates angle of metal tube, allows the local undergauge of metal tube finish gradually in the several times impact process.
Claims (3)
1, the local undergauge mould of metal tube, upper and lower mould draw close the die cavity that the back constitutes axial symmetrical section wavy curve wheel profile for local undergauge after the axisymmetric shape that coincide each other of the wavy curved profile of axial cross section outer rim of metal tube product, it is characterized in that: the die cavity of upper and lower mould is a symmetric shape, and die cavity is following character by vertical formed mould cross-section line with axial line:
The air line distance of A, mould cross-section line two-end-point a, a ' is more than 1.1 times of metal tube green diameter;
B, mould cross-section line center be one section with the metal tube moulding after the identical circular arc of curvature.
2,, it is characterized in that the one section line (ac or a ' c ') between outer end points of cross-section line and circular arc end points can be involute The initial segment shape by the described mould of claim 1.
3,, it is characterized in that the radius of the circular arc action h of cross-section line center less than this circular arc by claim 1 or 2 described moulds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93120472 CN1031628C (en) | 1993-12-09 | 1993-12-09 | Process for local radial contraction for metal tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93120472 CN1031628C (en) | 1993-12-09 | 1993-12-09 | Process for local radial contraction for metal tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1100677A CN1100677A (en) | 1995-03-29 |
| CN1031628C true CN1031628C (en) | 1996-04-24 |
Family
ID=4993322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93120472 Expired - Fee Related CN1031628C (en) | 1993-12-09 | 1993-12-09 | Process for local radial contraction for metal tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1031628C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI417153B (en) * | 2011-01-07 | 2013-12-01 | Li Yun Yang | Barrel of pen and manufacturing method therefor |
| CN102602195A (en) * | 2011-01-20 | 2012-07-25 | 杨丽云 | Pen tube and forming and manufacturing method thereof |
| CN103008496B (en) * | 2012-12-28 | 2015-12-23 | 德阳万鑫电站产品开发有限公司 | A kind of manufacture method of nonmagnetic steel heavy wall annular forging piece |
| CN110369534A (en) * | 2019-07-18 | 2019-10-25 | 安徽润盈建材有限公司 | A kind of metal bamboo incremental extrusion mould-forming process |
| CN113600732B (en) * | 2021-06-16 | 2023-04-07 | 初冠南 | Die for shortening local circumference of tube blank and using method thereof |
-
1993
- 1993-12-09 CN CN 93120472 patent/CN1031628C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1100677A (en) | 1995-03-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |