CN202137237U - Small-radius bending die for thin-walled stainless steel pipes - Google Patents
Small-radius bending die for thin-walled stainless steel pipes Download PDFInfo
- Publication number
- CN202137237U CN202137237U CN201020679972U CN201020679972U CN202137237U CN 202137237 U CN202137237 U CN 202137237U CN 201020679972 U CN201020679972 U CN 201020679972U CN 201020679972 U CN201020679972 U CN 201020679972U CN 202137237 U CN202137237 U CN 202137237U
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- stainless steel
- steel tube
- clamping claw
- tube workpiece
- bending die
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Abstract
The utility model discloses a small-radius bending die for thin-walled stainless steel pipes, which comprises a bending die, a combined clamping jaw, a pressing plate, an creasing-preventive plate and a special flattening-preventive core rod. The bending die is positioned on the inner side of a stainless steel pipe workpiece and attached to the inner side of the stainless steel pipe workpiece, the pressing plate is mounted on the outer side of one end of the stainless steel pipe workpiece, the creasing-preventive plate is mounted on the inner side of one end of the stainless steel pipe workpiece, the special flattening-preventive core rod is inserted into an inner cavity at the end of the stainless steel workpiece with the creasing-preventive plate, and the combined clamping jaw is mounted on the outer wall of the other end of the stainless steel pipe workpiece. The small-radius bending die solves problems that the thin-walled stainless steel pipes are creased and flattened after being bent.
Description
Technical field
The utility model relates to a kind of thin-wall stainless steel minor radius bending mould.
Background technology
The stainless steel tube bending molding process is widely used in the manufacturing industry such as automobile, boats and ships, aircraft, food machinery, chemical industry equipment, and for example the car blast pipe is just by the stainless steel tube brake forming.But in engineering practice; To thin-wall stainless steel carry out minor radius very easily cause when crooked brake forming gross distortion---the inboard is significantly wrinkling; Obviously flatten along the flexural center in the outside, and its cross sectional shape becomes the pancake after the bending by the circle before crooked, and sectional area also significantly shrinks.This not only causes appearance quality, and the more important thing is that meeting influence service property (quality), during for example as automobile exhaust pipe the effective area of exhaust emissions is reduced, and resistance increases, and causes exhaust not smooth.Crooked wrinkling, flattening problem when therefore, thin-wall stainless steel carries out the minor radius brake forming must solve.
The utility model content
The purpose of the utility model is to provide a kind of thin-wall stainless steel minor radius bending mould, uses the mould of the utility model can solve the problem that thin-wall stainless steel canal curvature rear curved is wrinkling, flatten.
In order to reach above-mentioned purpose, the solution of the utility model is:
A kind of thin-wall stainless steel minor radius bending mould comprises bending die, combined type clamping claw, holding pad, wrinkle resistant plate and the anti-special core rod that flattens; Wherein bending die is positioned at the inboard of stainless steel tube workpiece, and is close to the inboard of stainless steel tube workpiece; Holding pad is installed in the outside of an end of stainless steel tube workpiece, and wrinkle resistant plate is installed in the inboard of an end of stainless steel tube workpiece, and the insertion of the inner chamber of the stainless steel tube workpiece of this end is equipped with the anti-special core rod that flattens; The combined type clamping claw is installed on the outer wall of the other end of stainless steel tube workpiece.
Offer the forming tank of annular on the circumference of described bending die, make the stainless steel tube workpiece just be positioned at forming tank; Offer the breach that is used for installation and combination formula clamping claw on the bending die.
Described bending die radius is 50mm; The width of the notch of described forming tank is the overgauge of getting stainless steel tube workpiece 1 diameter, and the purpose of getting overgauge is that assurance stainless steel tube workpiece 1 is gone into groove; The degree of depth of forming tank is got the minus deviation of stainless steel tube workpiece radius, and the purpose of getting minus deviation is to guarantee that workpiece clamps.
Described combined type clamping claw comprises first clamping claw and second clamping claw, and all offers annular groove in the middle of first clamping claw and second clamping claw, and the width of rebate of annular groove is identical with width of rebate, the degree of depth of forming tank; And the length L of first clamping claw and second clamping claw is 2.5-3 times of the stainless steel tube diameter of work.
Described holding pad and wrinkle resistant plate all are made into the indent radian plate that the circumference with the bending die forming tank is complementary, and wrinkle resistant plate bottom is provided with the protruding semicircular ring identical with forming tank width of rebate, the degree of depth of bending die; The length of described holding pad and wrinkle resistant plate is 100-200mm.
Described anti-flattening special core rod comprises the head of columniform support portion and trapezoidal setting, and its diameter is than the little 0.3-0.4mm of stainless steel tube workpiece.
The beneficial effect of the utility model is: the mould that uses the utility model; Make do not produce distortion, particularly inboard behind the thin-wall stainless steel canal curvature can be significantly not wrinkling, the outside can obviously not flattened along the flexural center yet; Can not cause the quality problems of outward appearance, more can not influence service property (quality).
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the structural representation of bending die 2 among Fig. 1;
Fig. 3 is the upward view of Fig. 2;
Fig. 4 is the A-A cutaway view of combined type clamping claw among Fig. 1;
Fig. 5 is the left view of second clamping claw 4 in Fig. 2 combined type clamping claw;
Fig. 6 is the B-B cutaway view of holding pad and wrinkle resistant plate among Fig. 1.
The specific embodiment
A kind of thin-wall stainless steel minor radius bending mould of present embodiment: comprise bending die 2, combined type clamping claw, holding pad 5, wrinkle resistant plate 6 and the anti-special core rod 7 that flattens; Wherein bending die 2 is positioned at the inboard of stainless steel tube, and is close to the inboard of stainless steel tube; Holding pad 5 is installed in the outside of an end of stainless steel tube workpiece 1, and wrinkle resistant plate 6 is installed in the inboard of an end of stainless steel tube workpiece 1, and the insertion of the inner chamber of the stainless steel tube workpiece 1 of this end is equipped with the anti-special core rod 7 that flattens; The combined type clamping claw is installed on the outer wall of the other end of stainless steel tube workpiece 1.Offer the forming tank 21 of annular on the circumference of described bending die 2, make stainless steel tube workpiece 1 just be positioned at forming tank 21; Offer the breach 22 that is used for installation and combination formula clamping claw on the bending die 2.Breach 22 is used to support the combined type clamping claw, puts in place with the clamping claw supporting and is advisable.Because of the workpiece relative bending radius is very little, can not consider springback factor, described bending die 2 radiuses are 50mm; Bending die thickness H is advisable to satisfy rigidity.The diameter of the stainless steel tube workpiece 1 of present embodiment is 32; The width of the notch of described forming tank 21 is got the overgauge of stainless steel tube workpiece 1 diameter 32 for
width of forming tank 21, and the purpose of getting overgauge is that assurance stainless steel tube workpiece 1 is gone into groove; The degree of depth is got the minus deviation of stainless steel tube workpiece 1 radius 16 for
degree of depth, and the purpose of getting minus deviation is to guarantee that workpiece clamps.Described combined type clamping claw comprises first clamping claw 3 and second clamping claw 4; And all offer annular groove 8 in the middle of first clamping claw 3 and second clamping claw 4; During work; Clamp stainless steel tube workpiece 1 in the groove, and the width of rebate of annular groove 8 is identical with width of rebate, the degree of depth of forming tank 21; In order to guarantee reliable clamping; The clamping face plucking that skids when avoiding bending, the curved interior unstability is wrinkling, and the length L of first clamping claw 3 and second clamping claw 4 should be longer relatively; This also helps improving the rigidity of workpiece; But oversize clamping length be prone to increase difficulty of processing, and possibly cause the other end distortion of workpiece to crush and destroy bending quality, so the length L of first clamping claw 3 and second clamping claw 4 is 2.5-3 times of stainless steel tube workpiece 1 diameter.Described holding pad 5 and wrinkle resistant plate 6 all are made into the indent radian plate that the circumference with bending die 2 forming tank 21 is complementary, and wrinkle resistant plate 6 bottoms are provided with the protruding semicircular ring 9 identical with forming tank 21 width of rebate, the degree of depth of bending die 2; The length of described holding pad 5 and wrinkle resistant plate 6 is 100-200mm.Add man-hour, but holding pad 5 process with wrinkle resistant plate 6 one, after the middle perforate, the placed in the middle incision gets final product.Described anti-flattening special core rod 7 (being called for short A core rod), anti-flat to guarantee, processing is simple, easy accessibility is a principle.Practice shows, common round end plug processing and easy to use, but anti-flat effect is relatively poor; C core rod (movable joint plug) can guarantee good anti-flat effect, but makes complicacy, the mounting or dismounting inconvenience after the brake forming, in case fatigue fracture takes place, movable joint must be reformed; And A core rod (more difficult slightly than round end plug) easy to process, anti-flat (poorer slightly) satisfactory for result than C core rod.In the automobile exhaust pipe bending molding process, through test of many times relatively, confirm to select for use A core rod.Described anti-flattening special core rod 7 comprises the head 11 of columniform support portion 10 and trapezoidal setting, and its diameter is than stainless steel tube workpiece 1 little 0.3-0.4mm.Practice shows, plug should have a small lead when installing, and this confirms according to actual conditions (comprising bending conditions such as material, bending radius, pipe fitting diameter, wall thickness), accurately locatees then, to guarantee the stability of Forming Quality.
The stainless steel tube workpiece 1 brake forming principle of the utility model is: stainless steel tube workpiece 1 stress; Receive external force Pz effect; Its outside receive action of pulling stress and produce bullet, plastic deformation is extended because the crooked relative amount of tension of thin-wall stainless steel of minor radius is bigger, and pipe fitting often rigidity is relatively poor; Cause material when also fully not accomplishing the tangential plastic elongation, to produce radial shear surrender, i.e. τ＞τ
S' (τ refers to shear stress, τ
S' shear yield stress), causes radially (normal direction) plasticity dislocation (distortion) and present macroscopic view and " cave in ", promptly produce and flatten phenomenon.Inboard compression chord effect and produce bullet, plasticity compression; Because of decrement reaches pipe fitting rigidity deficiency more greatly, material at first produces elastic instability equally, and crooked circumferencial direction is corrugated in external force N effect lower edge; Cause the pipe fitting regional area to bear the effect of shear stress; Along with the increase of P power, material production shear yielding, i.e. τ＞τ
s, (τ refers to shear stress, τ
sRefer to the shearing resistance yield stress) thus the wrinkling of generation unidirectional setback in pipe.During brake forming, at stainless steel tube workpiece 1 bend tension limit inner chamber anti-flattening special core rod 7 being set is for balance shear stress, eliminates shear yielding, avoids normal direction plasticity dislocation (distortion), thereby solves the flattening problem.In brake forming power Pz effect, stainless steel tube workpiece 1 axially imposes tensile force P
xWith wrinkle resistant supporting, P
xProvided by the combined type clamping claw, wrinkle resistant supporting is realized by wrinkle resistant support plate 6.Consequent tension should be not less than because the compression of the crooked compressional zone that brake forming produces with equilibrium pressure stress, is eliminated elastic instability, avoids the pipe fitting setback, thereby solves wrinkling problem.
Use the mould of present embodiment to the processing step that thin-wall stainless steel carries out the minor radius bending to be: 1) outside of stainless steel tube workpiece 1 one ends is installed in the groove of holding pad 5; The installed inside of stainless steel tube workpiece 1 is installed on the bending die 2 after then holding pad 5 and wrinkle resistant plate 6 combinations being fixed in the groove holding pad of wrinkle resistant plate 3 simultaneously; 2) insert at the inner chamber of an end of the stainless steel tube workpiece 1 that holding pad 5 and wrinkle resistant plate 6 are installed the anti-special core rod 7 that flattens is installed; 3) outer wall of the other end of stainless steel tube workpiece 1 is equipped with the combined type clamping claw, and the combined type clamping claw is installed on the bending die 2; 4) on the combined type clamping claw, act on forming force P then
Z, P
X, implement brake forming,, bending accomplishes bending molding process after putting in place.
Claims (6)
1. a thin-wall stainless steel minor radius bending mould is characterized in that: comprise bending die (2), combined type clamping claw, holding pad (5), wrinkle resistant plate (6) and the anti-special core rod (7) that flattens; Wherein bending die (2) is positioned at the inboard of stainless steel tube workpiece (1), and is close to the inboard of stainless steel tube workpiece (1); Holding pad (5) is installed in the outside of an end of stainless steel tube workpiece (1), and wrinkle resistant plate (6) is installed in the inboard of an end of stainless steel tube workpiece (1), and the insertion of the inner chamber of the stainless steel tube workpiece (1) of this end is equipped with the anti-special core rod (7) that flattens; The combined type clamping claw is installed on the outer wall of the other end of stainless steel tube workpiece (1).
2. a kind of thin-wall stainless steel minor radius bending mould as claimed in claim 1 is characterized in that: offer the forming tank (21) of annular on the circumference of described bending die (2), make stainless steel tube workpiece (1) just be positioned at forming tank (21); Offer the breach (22) that is used for installation and combination formula clamping claw on the bending die (2).
3. a kind of thin-wall stainless steel minor radius bending mould as claimed in claim 2 is characterized in that: described bending die (2) radius is 50mm; The width of the notch of described forming tank (21) is got the overgauge of stainless steel tube workpiece (1) diameter; The degree of depth of forming tank (21) is got the minus deviation of stainless steel tube workpiece (1) radius.
4. a kind of thin-wall stainless steel minor radius bending mould as claimed in claim 1; It is characterized in that: described combined type clamping claw comprises first clamping claw (3) and second clamping claw (4); And all offer annular groove (8) in the middle of first clamping claw (3) and second clamping claw (4), and the width of rebate of annular groove (8) is identical with width of rebate, the degree of depth of forming tank (21); And the length L of first clamping claw (3) and second clamping claw (4) is 2.5-3 times of stainless steel tube workpiece (1) diameter.
5. a kind of thin-wall stainless steel minor radius bending mould as claimed in claim 1; It is characterized in that: described holding pad (5) and wrinkle resistant plate (6) all are made into the indent radian plate that the circumference with bending die (2) forming tank (21) is complementary, and wrinkle resistant plate (6) bottom is provided with the protruding semicircular ring (9) identical with forming tank (21) width of rebate, the degree of depth of bending die (2); The length of described holding pad (5) and wrinkle resistant plate (6) is 100-200mm.
6. a kind of thin-wall stainless steel minor radius bending mould as claimed in claim 1; It is characterized in that: described anti-flattening special core rod (7) comprises the head (11) of columniform support portion (10) and trapezoidal setting, and its diameter is than the little 0.3-0.4mm of stainless steel tube workpiece (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020679972U CN202137237U (en) | 2010-12-14 | 2010-12-14 | Small-radius bending die for thin-walled stainless steel pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020679972U CN202137237U (en) | 2010-12-14 | 2010-12-14 | Small-radius bending die for thin-walled stainless steel pipes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202137237U true CN202137237U (en) | 2012-02-08 |
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ID=45548316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020679972U Expired - Fee Related CN202137237U (en) | 2010-12-14 | 2010-12-14 | Small-radius bending die for thin-walled stainless steel pipes |
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|---|---|
| CN (1) | CN202137237U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102172691A (en) * | 2010-12-14 | 2011-09-07 | 绍兴文理学院 | Thin-wall stainless steel tube small-radium bending process and mold |
| CN102921780A (en) * | 2012-10-19 | 2013-02-13 | 上海大俊凯电器科技有限公司 | Heat exchanger bending device |
| CN111389980A (en) * | 2020-03-20 | 2020-07-10 | 苏州工业园区良裕科技有限公司 | Control method and system for powerful post-boosting pipe bending of pipe bending machine |
-
2010
- 2010-12-14 CN CN201020679972U patent/CN202137237U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102172691A (en) * | 2010-12-14 | 2011-09-07 | 绍兴文理学院 | Thin-wall stainless steel tube small-radium bending process and mold |
| CN102921780A (en) * | 2012-10-19 | 2013-02-13 | 上海大俊凯电器科技有限公司 | Heat exchanger bending device |
| CN111389980A (en) * | 2020-03-20 | 2020-07-10 | 苏州工业园区良裕科技有限公司 | Control method and system for powerful post-boosting pipe bending of pipe bending machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120208 Termination date: 20141214 |
|
| EXPY | Termination of patent right or utility model |