CN100384558C - Thin-wall tube curvature-variable push-bending process and die - Google Patents
Thin-wall tube curvature-variable push-bending process and die Download PDFInfo
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- CN100384558C CN100384558C CNB2004100918240A CN200410091824A CN100384558C CN 100384558 C CN100384558 C CN 100384558C CN B2004100918240 A CNB2004100918240 A CN B2004100918240A CN 200410091824 A CN200410091824 A CN 200410091824A CN 100384558 C CN100384558 C CN 100384558C
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- bending
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- variable curvature
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Abstract
The present invention relates to a thin wall tube variable curvature push-bending process and a die. The thin wall tube variable curvature push-bending process of the present invention comprises the following steps: a tube blank (2) is firstly placed on the straight line part in a variable curvature type slot (41) of a bending die; a pressing machine descends to drive a push-bending punching head to push the tube blank (2) for bending deformation; parts (3) are taken out after die opening. The die used by the thin wall tube variable curvature push-bending process of the present invention comprises the push-bending punching head (1), the bending die (4), a lower die plate (5), a punching head fixing plate (8) and an upper die plate (9), wherein the push-bending punching head (1) is arranged on the punching head fixing plate (8) connected with the upper die plate (9) through a connecting piece (10), the bending die (4) arranged at the lower part of the push-bending punching head (1) is arranged on the lower die plate (5), the variable curvature type slot (41) is arranged in the bending die (4), and the tube blank (2) is arranged on the straight line part in the variable curvature type slot (41) of the bending die (4). Since the present invention adopts the variable curvature type slot to replace the traditional constant curvature type slot, the variable curvature bending process disperses large centralized deformation to be completed in different stages, in one push-bending process, corresponding to constant curvature bending, larger deformation can be obtained, and a large bending angle and a smaller bend radius can be obtained. The present invention can increase the tube bending deformation degree and increase the production efficiency of the bending tube. The die used by the thin wall tube variable curvature push-bending process of the present invention has the advantages of simple structure, convenience and practicality.
Description
Technical field:
The present invention is a kind of variable camber bending process and die of thin-walled tubes, belongs to the innovative technology of light-wall pipe push-bending process and mould.
Background technology:
Crooked pipe part is widely used in industries such as petrochemical industry, building construction, automobile, aviation.This is not only because crooked pipe part has the pipe-line system of change logistics direction function, also since the hollow bent pipe part to possess area of section little, the feature that the bending resistant section coefficient is big, the ability of when bearing external applied load, can improve bending resistance, turning round.Rationally use hollow crooked part not only can guarantee the quality of machinery equipment, can also save material, weight reduction reduces cost.Traditional light-wall pipe bending process, mainly contain go for a stroll, roll curved, bend and push away methods such as curved.No matter but be which kind of method, when carrying out bending, when flector that pipe passes through or mould, its bending radius is constant, promptly permanent curvature bending.Because the Transformation of Bendt Pipe degree is relevant with relative bending radius and relative thickness, different materials all has certain restriction with different bending methods to bending radius and angle of bend etc., therefore, if obtain bigger deformation extent, must adopting repeatedly, the bending machining mode just can reach.Used the bend pipe part that hydroforming can obtain minor radius in recent years, but hydroforming needs special equipment and hydraulic system, production efficiency is lower, is subjected to certain restriction so apply.The present invention uses the bend pipe part of the flexure type groove shaping minor radius of variable curvature in the mould.
Summary of the invention:
The objective of the invention is to overcome above-mentioned shortcoming and a kind of Transformation of Bendt Pipe degree that both can improve is provided, can improve the thin-wall tube curvature-variable push-bending process of the production efficiency of bend pipe again.The present invention can significantly reduce production costs, and improves the quality of products, and creates remarkable economic efficiency.
Another object of the present invention is to provide a kind of simple in structure, convenient and practical used mould of thin-wall tube curvature-variable push-bending process.
Thin-wall tube curvature-variable push-bending process of the present invention comprises the steps:
1) earlier pipe is placed on straight line portion in the variable curvature type groove of bending die;
2) the descending drive of forcing press pushes away curved drift and promotes pipe and carry out flexural deformation;
3) part is taken out in die sinking.
The mould that thin-wall tube curvature-variable push-bending process of the present invention is used, include and push away curved drift, bending die, lower bolster, drift fixed head, cope match-plate pattern, pushing away curved drift is installed on the drift fixed head, the drift fixed head is connected with cope match-plate pattern by connector, bending die places the below that pushes away curved drift, and be installed on the lower bolster, wherein be provided with variable curvature type groove in the bending die, pipe is placed on the straight line portion in the variable curvature type groove of bending die.
Above-mentioned lower bolster is provided with two guide pillars, cope match-plate pattern with the corresponding position of guide pillar on be provided with two guide pin bushings that can slide along guide pillar.
The contact-making surface of above-mentioned pressing plate and drift fixed head is provided with backing plate.
The end face of above-mentioned bending die is provided with limiting plate.
The below of above-mentioned drift fixed head also is equiped with the cushion that contacts with limiting plate.
The top of above-mentioned bending die one side is equiped with ejector block.
The both sides of above-mentioned bending die are equiped with fixed block respectively.
Lubricant is coated on the surface of above-mentioned pipe variable curvature type groove.
The inner chamber of above-mentioned pipe can be equipped with filler or plug.
The present invention is owing to adopt variable curvature type groove to substitute traditional permanent curvature type groove, its variable curvature bending process is dispersed in the different stages with big concentrated distortion and finishes, once pushing away the curved permanent relatively curvature bending of process, bigger distortion can be obtained, big angle of bend and less bending radius can be obtained.Along with Development on numerical control (NC) Technology, the processing of curve and curved surface no longer becomes difficulty, has practical promotional value so improve the curvature-variable push-bending process of pipe fitting flexural deformation degree.The present invention both can improve the Transformation of Bendt Pipe degree, can improve the production efficiency of bend pipe again, was a kind of can significantly reducing production costs, and improved the quality of products, and created the thin-wall tube curvature-variable push-bending process of distinct economic.The used mould structure of thin-wall tube curvature-variable push-bending process of the present invention is simple, convenient and practical.
Description of drawings:
Fig. 1 is the variable curvature track configuration schematic diagram of the variable curvature type groove of bending die among the mould embodiment 1 of the present invention;
Fig. 2 is the structural representation of mould embodiment 1 of the present invention;
Fig. 3 is the structural representation of mould embodiment 2 of the present invention.
The specific embodiment:
Embodiment 1:
Thin-wall tube curvature-variable push-bending process of the present invention comprises the steps:
1) earlier pipe 2 is placed on straight line portion in the variable curvature type groove 41 of bending die 4;
2) be about to push away curved drift 1 promotion pipe 2 under the forcing press and carry out flexural deformation;
3) part 3 is taken out in die sinking.
The embodiment of the invention from production application easily angle select the variable curvature equation of locus of involute for use as the variable curvature type groove 41 of bending die 4, when using involute and pushing away curved leading line as rectangle or circular tube, both can on same curve, select for use different intervals to satisfy and be bent the requirement of part angle of bend and radius, also can be by choosing corresponding curve interval on the involute that forms by different base radius.Its structural representation as shown in Figure 1, if select to push away the variable curvature radius bend pipe that curves 90 ° in a) at Fig. 1, minimum bending radius is r=20mm.At first obtain the position of least radius:
Add 90 ° then on this basis and promptly obtain the interval θ that requires
e=114,6 °+90 °=204,6 °, as Fig. 1 b) shown in, according to the flexure type groove of selected section processing as Fig. 1 c) shown in.Can choose desired section similarly. in addition can also also choose corresponding section thereon by the base radius of conversion involute.
The structural representation of the mould that thin-wall tube curvature-variable push-bending process of the present invention is used as shown in Figure 2, include and push away curved drift 1, bending die 4, lower bolster 5, drift fixed head 8, cope match-plate pattern 9, pushing away curved drift 1 is installed on the drift fixed head 8, drift fixed head 8 is connected with cope match-plate pattern 9 by connector 10, bending die 4 places the below that pushes away curved drift 1, and be installed on the lower bolster 5, wherein be provided with variable curvature type groove 41 in the bending die 4, pipe 2 is placed on the straight line portion in the variable curvature type groove 41 of bending die 4.
Steady in order to ensure the motion that pushes away curved drift 1, above-mentioned lower bolster 5 is provided with two guide pillars 6, cope match-plate pattern 9 with guide pillar 6 corresponding positions on be provided with two guide pin bushings 7 that can slide along guide pillar 6.
For the ease of determining to push away the movement travel of curved drift 1, the end face of above-mentioned bending die 4 is provided with limiting plate 12.
For the ease of bending die 4 is installed, the both sides of above-mentioned bending die 4 are equiped with fixed block 15 respectively.
The distortion situation of pipe and prevent the generation of bad phenomenon such as unstability is wrinkling when improving bending, lubricant is coated on the surface of above-mentioned pipe 2 variable curvature type grooves 41, and the inner chamber of above-mentioned pipe 2 can be equipped with filler or plug.
When the present invention works, earlier pipe 2 is placed on the straight line portion in the variable curvature type groove 41 of bending die 4, is about to push away curved drift 1 under the forcing press and promotes pipe 2 and carry out flexural deformation be configured as part 3 in variable curvature type groove 41, part 3 is taken out in last die sinking.
Embodiment 2:
Thin-wall tube curvature-variable push-bending process of the present invention is identical with embodiment 1.The structural representation of its mould therefor as shown in Figure 3, its structure is identical with embodiment 1, difference is that bool need finish in long pushing away in the detour footpath, for this reason, the below of above-mentioned drift fixed head 8 also is equiped with the cushion 13 that contacts with limiting plate 12, and is bigger with the impulsive force of limiting plate 12 to avoid pushing away curved drift 1.In addition, take out part 3 for making things convenient for die sinking, the top of above-mentioned bending die 4 one sides is equiped with ejector block 14.
Operation principle of the present invention is identical with embodiment 1.
Claims (10)
1. a thin-wall tube curvature-variable push-bending process is characterized in that comprising the steps:
1) earlier pipe (2) is placed on straight line portion in the variable curvature type groove (41) of bending die (4);
2) be about to push away curved drift (1) promotion pipe (2) under the forcing press and carry out flexural deformation by variable curvature type groove (41);
3) part (3) is taken out in die sinking.
2. according to the used mould of the described thin-wall tube curvature-variable push-bending process of claim 1, it is characterized in that including and push away curved drift (1), bending die (4), lower bolster (5), drift fixed head (8), cope match-plate pattern (9), pushing away curved drift (1) is installed on the drift fixed head (8), drift fixed head (8) is connected with cope match-plate pattern (9) by connector (10), bending die (4) places the below that pushes away curved drift (1), and be installed on the lower bolster (5), wherein be provided with variable curvature type groove (41) in the bending die (4), pipe (2) is placed on the straight line portion in the variable curvature type groove (41) of bending die (4).
3. mould according to claim 2 is characterized in that above-mentioned lower bolster (5) is provided with some guide pillars (6), cope match-plate pattern (9) with the corresponding position of guide pillar (6) on be provided with some guide pin bushings (7) that can slide along guide pillar (6).
4. mould according to claim 2 is characterized in that the above-mentioned cope match-plate pattern (9) and the contact-making surface of drift fixed head (8) are provided with backing plate (11).
5. mould according to claim 2 is characterized in that the end face of above-mentioned bending die (4) is provided with limiting plate (12).
6. according to claim 2 or 3 or 4 or 5 described moulds, it is characterized in that the below of above-mentioned drift fixed head (8) also is equiped with the cushion (13) that contacts with limiting plate (12).
7. mould according to claim 6 is characterized in that the top of above-mentioned bending die (4) one sides is equiped with ejector block (14).
8. mould according to claim 7 is characterized in that the both sides of above-mentioned bending die (4) are equiped with fixed block (15) respectively.
9. mould according to claim 8 is characterized in that lubricant is coated on the surface of above-mentioned pipe (2) variable curvature type groove (41).
10. mould according to claim 9 is characterized in that the inner chamber of above-mentioned pipe (2) can be equipped with filler or plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100918240A CN100384558C (en) | 2004-12-31 | 2004-12-31 | Thin-wall tube curvature-variable push-bending process and die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100918240A CN100384558C (en) | 2004-12-31 | 2004-12-31 | Thin-wall tube curvature-variable push-bending process and die |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1799722A CN1799722A (en) | 2006-07-12 |
| CN100384558C true CN100384558C (en) | 2008-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100918240A Expired - Fee Related CN100384558C (en) | 2004-12-31 | 2004-12-31 | Thin-wall tube curvature-variable push-bending process and die |
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| CN (1) | CN100384558C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102000723A (en) * | 2010-09-14 | 2011-04-06 | 肇庆市骏驰科技有限公司 | Multi-boss molding device for automotive pipeline |
| CN102225447B (en) * | 2011-05-13 | 2013-07-03 | 重庆飞龙江利汽车部件有限公司 | Cylinder head cover breather pipe machining die |
| CN103286172A (en) * | 2012-02-27 | 2013-09-11 | 辽阳石化机械设计制造有限公司 | Stainless steel cold-extruding bending machine |
| CN103920765B (en) * | 2014-04-03 | 2016-07-13 | 南京航空航天大学 | Thin metallic tubd pushes away o ing method |
| CN105268839A (en) * | 2014-07-04 | 2016-01-27 | 杭州萧山民主模具厂 | Stamping die |
| CN105215113B (en) * | 2015-09-25 | 2017-10-27 | 沈阳航空航天大学 | A kind of continuous recurvation Aluminum Alloy Tube pushes away o ing device and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4875353A (en) * | 1988-11-01 | 1989-10-24 | Kabushiki Kaisha Asahi Kinzoku Kogyosho | Method and apparatus for manufacturing curved pipe |
| US4989435A (en) * | 1989-12-11 | 1991-02-05 | Kabushiki Kaisha Asahi Kinzoku Hogyosho | Method and apparatus for manufacturing curved pipe |
| CN1050835A (en) * | 1990-08-01 | 1991-04-24 | 大连弯头化工机械厂 | Variable-diameter special-shaped seamless metal pipe bend forming method |
| JP2003170226A (en) * | 2001-12-06 | 2003-06-17 | Mitsubishi Heavy Ind Ltd | Apparatus and method for bending pipe |
| CN2762912Y (en) * | 2004-12-31 | 2006-03-08 | 广东工业大学 | Die sued for bending thin-wall tube variable curvature |
-
2004
- 2004-12-31 CN CNB2004100918240A patent/CN100384558C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4875353A (en) * | 1988-11-01 | 1989-10-24 | Kabushiki Kaisha Asahi Kinzoku Kogyosho | Method and apparatus for manufacturing curved pipe |
| US4989435A (en) * | 1989-12-11 | 1991-02-05 | Kabushiki Kaisha Asahi Kinzoku Hogyosho | Method and apparatus for manufacturing curved pipe |
| CN1050835A (en) * | 1990-08-01 | 1991-04-24 | 大连弯头化工机械厂 | Variable-diameter special-shaped seamless metal pipe bend forming method |
| JP2003170226A (en) * | 2001-12-06 | 2003-06-17 | Mitsubishi Heavy Ind Ltd | Apparatus and method for bending pipe |
| CN2762912Y (en) * | 2004-12-31 | 2006-03-08 | 广东工业大学 | Die sued for bending thin-wall tube variable curvature |
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| Publication number | Publication date |
|---|---|
| CN1799722A (en) | 2006-07-12 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Yangxi Elevator Parts Co., Ltd. Assignor: Guangdong University of Technology Contract fulfillment period: 2009.3.16 to 2015.3.15 contract change Contract record no.: 2009440000390 Denomination of invention: Thin-wall tube curvature-variable push-bending process and die Granted publication date: 20080430 License type: Exclusive license Record date: 2009.5.22 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.3.16 TO 2015.3.15; CHANGE OF CONTRACT Name of requester: YANGXI ELEVATOR FITTINGS CO., LTD. Effective date: 20090522 |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080430 Termination date: 20121231 |