CN114346022A - Aluminum profile stretch bending core rod structure and design method - Google Patents
Aluminum profile stretch bending core rod structure and design method Download PDFInfo
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- CN114346022A CN114346022A CN202111540975.XA CN202111540975A CN114346022A CN 114346022 A CN114346022 A CN 114346022A CN 202111540975 A CN202111540975 A CN 202111540975A CN 114346022 A CN114346022 A CN 114346022A
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 95
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 95
- 238000005452 bending Methods 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005491 wire drawing Methods 0.000 claims description 23
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 230000008602 contraction Effects 0.000 claims description 7
- 229910000838 Al alloy Inorganic materials 0.000 claims description 5
- 238000004088 simulation Methods 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 239000000945 filler Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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Abstract
The invention discloses an aluminum profile stretch bending mandrel structure which comprises a first rubber shell and a second rubber shell which are detachably connected, wherein a first cavity is arranged in the middle of the first rubber shell, a second cavity is arranged in the middle of the second rubber shell, springs are arranged in the first cavity and the second cavity, two ends of each spring are in limit fit with limiting plates, the two limiting plates are connected through an adjusting mechanism, and the adjusting mechanism is used for adjusting the distance between the two limiting plates. The invention also discloses a design method of the aluminum profile stretch-bending mandrel structure, which comprises the steps of obtaining the length, the diameter and the elastic coefficient of the spring and the longitudinal allowable expansion amount and the transverse allowable expansion amount of the spring according to the maximum bending stress, obtaining the longitudinal precompression amount of the spring according to the maximum longitudinal expansion amount and the longitudinal allowable expansion amount of the aluminum profile, and obtaining the transverse precompression amount of the spring according to the maximum transverse expansion amount and the transverse allowable expansion amount of the aluminum profile. The invention improves the stretch bending quality of the aluminum profile and is suitable for aluminum profiles with different sizes.
Description
Technical Field
The invention relates to the technical field of material stretch bending forming, in particular to an aluminum profile stretch bending core rod structure and a design method.
Background
Along with the continuous deepening of the lightweight technology, the application of the aluminum alloy on the automobile body and the chassis is more and more extensive, the forming process of the aluminum alloy mainly comprises bending and stretch bending, because the section structure of the aluminum profile is generally a special-shaped structure, numerical control bending can not be realized, a stretch bending process is generally adopted, in the stretch bending process, the aluminum profile has the defects of depression and the like due to lack of internal mechanical support, and secondary internal high-pressure bulging needs to be carried out after the stretch bending process in order to ensure the quality of the product, so that the development cost and the development period of the product are greatly increased, therefore, in order to reduce the development cost and the cycle time, the internal support is generally enhanced by adding a certain filler in the aluminum profile, sand, chains and plastic are generally used as the filler, however, these fillers are only suitable for stretch bending with small deformations, and they do not provide effective support for large deformation stretch bending with twisting. Therefore, the development of the core rod with variable strength is extremely beneficial to improving the stretch bending quality of the aluminum profile.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an aluminum profile stretch bending mandrel structure and a design method thereof.
In order to achieve the purpose, the invention provides an aluminum profile stretch bending mandrel structure which comprises a first rubber shell and a second rubber shell which are detachably connected, wherein a first cavity is arranged in the middle of the first rubber shell, a second cavity is arranged in the middle of the second rubber shell, springs are arranged in the first cavity and the second cavity, two ends of each spring are in limit fit with limit plates, the two limit plates are connected through an adjusting mechanism, and the adjusting mechanism is used for adjusting the distance between the two limit plates.
Furthermore, a first transverse flexible wire drawing and a second transverse flexible wire drawing which are perpendicular to each other are connected to the inner circle of each circle of the spring.
Furthermore, both ends of the first transverse flexible drawn wire and the second transverse flexible drawn wire are connected with adjusting screw rods, fixing nuts are arranged on the inner circles of each circle of the spring, and the fixing nuts are in threaded fit with the adjusting screw rods.
Furthermore, the spring is a rectangular spring, a transition arc section is arranged at a corner of the rectangular spring, and the side lengths of the transverse flexible drawn wire and the longitudinal flexible drawn wire are respectively parallel to the side length of the rectangular spring.
Further, adjustment mechanism includes flexible regulation wire drawing and adjusting nut, flexible regulation wire drawing both ends pass behind the limiting plate with adjusting nut screw-thread fit.
Furthermore, the two ends of the first rubber shell are provided with first connectors, the first connectors are provided with connecting holes, and the two ends of the second rubber shell are provided with second connectors which are connected with the connecting holes through connecting bolts.
A design method based on the aluminum profile stretch bending mandrel structure comprises the following steps: the method comprises the steps of equating the stretching amount of a bending section of an aluminum profile to the stretching amount of a spring, obtaining the maximum longitudinal stretching amount, the maximum transverse stretching amount and the maximum bending stress of the aluminum profile through bending simulation analysis of the aluminum profile, obtaining the length, the diameter and the elastic coefficient of the spring and the longitudinal allowable stretching amount and the transverse allowable stretching amount of the spring according to the maximum bending stress, obtaining the longitudinal precompression amount of the spring according to the maximum longitudinal stretching amount and the longitudinal allowable stretching amount of the aluminum profile, and obtaining the transverse precompression amount of the spring according to the maximum transverse stretching amount and the transverse allowable stretching amount of the aluminum profile.
Further, the method for determining the longitudinal pre-compression amount of the spring further comprises the steps that the maximum longitudinal expansion amount of the aluminum profile comprises the maximum longitudinal expansion amount of the central lines of the four longitudinal planes of the aluminum profile, the maximum longitudinal expansion amount of the spring is obtained according to the maximum longitudinal expansion amount of the central lines of the four longitudinal planes of the aluminum profile and the preset longitudinal pre-compression amount of the spring, and the preset longitudinal pre-compression amount of the spring is obtained according to the relation that the absolute value of the maximum longitudinal expansion amount of the spring is smaller than the longitudinal allowable expansion amount of the spring.
Further, the spring is longitudinally precompressed by an amount LLongitudinal 0Is obtained by the following formula
max(|LLongitudinal 1+LLongitudinal 0|,|LLongitudinal 2+LLongitudinal 0|,|LLongitudinal 3+LLongitudinal 0|,|LLongitudinal 4+LLongitudinal 0|)＜LLongitudinal allowable use
In the formula, LLongitudinal 1Is the maximum longitudinal extension of the central line of the first longitudinal plane of the aluminum profile, LLongitudinal 2The maximum longitudinal extension of the central line of the second longitudinal plane of the aluminum profile, LLongitudinal 3The maximum longitudinal extension, L, of the central line of the third longitudinal plane of the aluminum profileLongitudinal 4The maximum longitudinal extension of the central line of the fourth longitudinal plane of the aluminum profile, LLongitudinal allowable useThe longitudinal allowable amount of expansion and contraction of the spring.
Further, the spring is laterally precompressed by an amount LHorizontal 0Is obtained by the following formula
max(|LCross 1+LHorizontal 0|,|LHorizontal bar 2+LHorizontal 0|)＜LAllowed to use horizontally
In the formula, LCross 1Is the maximum longitudinal extension of the first central line of the transverse plane of the aluminum profile, LHorizontal bar 2The maximum longitudinal extension of the second central line of the transverse plane of the aluminum profile, the central line of the first transverse plane is perpendicular to the central line of the second transverse plane, and L isAllowed to use horizontallyThe allowable transverse expansion of the spring.
Further, the initial length of the aluminum profile bending section is obtained through bending simulation analysis on the aluminum profile, and the length of the core rod is determined according to the initial length of the aluminum profile bending section.
Further, the length of the core rod is larger than or equal to the initial length of the aluminum profile bending section.
Further, the length of the flexible adjusting wire is determined according to the length of the spring and the maximum allowable stretching amount.
Further, the length of the flexible adjusting wire is larger than the sum of the length of the spring and the maximum allowable expansion and contraction amount.
The invention has the beneficial effects that:
1. the stretch bending quality of the aluminum profile is improved. The spring is arranged in the core rod, the core rod generates bending deformation along with the aluminum profile in the bending process after being inserted into the aluminum profile cavity, the core rod is in a bending deformation state after the bending is finished, the core rod which is leaked outside the aluminum profile is pulled out of the aluminum profile through forced pulling, and the core rod can return to an initial state by the restoring force of the spring after the bending part of the spring is separated from the bending part of the aluminum profile because the reverse deformation force of the core rod mainly comes from the spring. Therefore, the core rod can provide enough internal supporting force to prevent the bent section of the aluminum profile from sinking in the whole bending process, and the stretch bending quality is improved.
2. The method is suitable for core rods with different section sizes and bending stresses. According to the invention, the spring with adjustable longitudinal precompression and transverse precompression is arranged in the rubber shell of the core rod, the longitudinal precompression of the spring is adjusted through the limiting plate and the adjusting mechanism, and the transverse precompression of the spring is adjusted through adjusting the tightness of the first transverse flexible wire drawing and the second transverse flexible wire drawing. The outer dimension of the core rod is changed through adjustment, so that the outer dimension of the core rod is adapted to aluminum profiles with different section dimensions, the capability of resisting radial bending of the spring is improved after the spring is pre-compressed, and the pre-compression amount of the spring can be adjusted according to the aluminum profiles with different bending stresses.
Drawings
FIG. 1 is an exploded view of a mandrel construction of the present invention.
Fig. 2 is a schematic structural diagram of the inner ring of the spring.
Fig. 3 is a schematic structural diagram of a spring and an adjusting mechanism.
The components in the figures are numbered as follows: the flexible wire drawing device comprises a first rubber housing 1, a first connecting head 101, a connecting hole 102, a first cavity 103, a second rubber housing 2, a second connecting head 201, a connecting bolt 202, a second cavity 203, a spring 3, a limiting plate 4, a flexible adjusting wire drawing 5, an adjusting nut 6, a first transverse flexible wire drawing 7, a second transverse flexible wire drawing 8, an adjusting screw 9 and a fixing nut 10.
Detailed Description
The following detailed description is provided to further explain the claimed embodiments of the present invention in order to make it clear for those skilled in the art to understand the claims. The scope of the invention is not limited to the following specific examples. It is intended that the scope of the invention be determined by those skilled in the art from the following detailed description, which includes claims that are directed to this invention.
As shown in fig. 1, an aluminium alloy stretch bending mandrel structure, including first rubber housing 1 and the second rubber housing 2 that can dismantle the connection, the middle part of first rubber housing 1 is equipped with first cavity 103, the middle part of second rubber housing 2 is equipped with second cavity 203, when first rubber housing 1 and second rubber housing 2 connect, first cavity 103 and second cavity 203 merge into an overall confined cavity, be equipped with spring 3 that is in vertical precompression state in first cavity 103 and the second cavity 203, spring 3's both ends all with limiting plate 4 spacing cooperation, connect through adjustment mechanism between two limiting plates 4, adjustment mechanism includes flexible regulation wire drawing 5 and adjusting nut 6, flexible regulation wire drawing 5 both ends are equipped with the external screw thread, flexible regulation wire drawing 5 both ends pass behind the limiting plate 4 with adjusting nut 6 screw-thread fit. The distance between the limiting plates at the two ends is adjusted by rotating the adjusting nut, so that the longitudinal precompression amount of the spring is adjusted.
The inner circle of each circle of the spring 3 is connected with a first transverse flexible wire drawing 7 and a second transverse flexible wire drawing 8 which are perpendicular to each other. The two ends of the first transverse flexible drawn wire 7 and the second transverse flexible drawn wire 8 are both connected with adjusting screws 9, each circle of the inner circle of the spring 3 is provided with a fixing nut 10, and the fixing nuts 10 are in threaded fit with the adjusting screws 9. The tightness of the first transverse flexible wire drawing and the second transverse flexible wire drawing are adjusted by rotating the adjusting screw rod and the fixing nut to move relatively, and the adjustment of the transverse precompression amount of the spring is realized.
The spring 3 is a rectangular spring, the corner of the rectangular spring is a transition arc section, and the transverse flexible drawn wire 7 and the longitudinal flexible drawn wire 8 are respectively parallel to the side length of the rectangular spring. The shape of the rectangular spring is matched with the cross sections of the inner cavities of the core rod and the aluminum profile, so that sufficient internal supporting force can be provided for all positions of the cross section of the aluminum profile, and the stretch bending quality of the aluminum profile is improved.
Two ends of the first rubber shell 1 are provided with first connectors 101, the first connectors are provided with connecting holes 102, two ends of the second rubber shell 2 are provided with second connectors 201, and the second connectors 201 are connected with the connecting holes through connecting bolts 202. Like this first rubber housing realizes dismantling with the second rubber housing and is connected, when the plug is used for the aluminium alloy of different models, different bending stress.
When the aluminum profile bending device is used, after the core rod is inserted into the aluminum profile cavity, the core rod generates bending deformation along with the aluminum profile in the bending process, after the bending is finished, the core rod is in a bending deformation state, the core rod which is leaked outside the aluminum profile is pulled out from the aluminum profile through forced pulling, and due to the fact that the anti-deformation force of the core rod mainly comes from the spring, after the bending part of the spring is separated from the bending part of the aluminum profile, the core rod can return to the initial state through the restoring force of the spring. Therefore, the core rod can provide enough internal supporting force to prevent the bent section of the aluminum profile from sinking in the whole bending process, and the stretch bending quality is improved.
The outer dimension of the core rod is changed by adjusting the longitudinal precompression amount and the transverse precompression amount of the spring so as to adapt to aluminum profiles with different section dimensions, the strength of the spring resisting radial bending is improved after precompression, and the precompression amount of the spring can be adjusted according to the aluminum profiles with different bending stresses. And the adjustment of the local bending strength of the spring is realized by adjusting the transverse precompression amount of different transverse sections of the spring, for example, the transverse precompression amount of the transverse section of the spring at the position corresponding to the maximum section of the bending stress of the aluminum profile is increased, so that the supporting force of the spring to the aluminum profile can be improved.
The design method of the aluminum profile stretch bending core rod structure comprises the following steps:
1. firstly, the sectional dimension of the core rod is determined according to the sectional shape and the dimension of the aluminum profile.
2. And then, carrying out bending simulation analysis on the aluminum profile to obtain the initial length of the aluminum profile bending section, the maximum longitudinal stretching amount and the maximum transverse stretching amount of the central lines of the four longitudinal planes, the cross section where the maximum bending stress is located and the maximum bending stress, wherein the maximum bending stress of the aluminum profile is the internal required supporting force provided by the core rod.
3. Firstly, the length of the core rod is determined according to the initial length of the bending section of the aluminum profile, in order to enable the core rod to provide the inner wall supporting force in the whole bending section of the aluminum profile, the length of the core rod is larger than or equal to the initial length of the bending section of the aluminum profile, and therefore the external dimension of the core rod is determined. And obtaining the length, the diameter and the elastic coefficient of the spring and the longitudinal allowable expansion amount and the transverse allowable expansion amount of the spring according to the maximum bending stress of the aluminum profile and the external dimension of the core rod. The length and diameter of the spring are determined by taking the overall dimensions of the core rod and the maximum elastic deformation stress of the spring into consideration, since the spring can only be elastically deformed after providing the internal supporting force.
4. In the using process of the core rod, the core rod is kept relatively fixed with the aluminum profile through the gasket, and the inner cloth supporting force provided by the core rod is basically provided by the spring, so that the stretching amount of the bending section of the aluminum profile is equivalent to the stretching amount of the spring, and the bending stress borne by the aluminum profile is equivalent to the bending stress borne by the spring at the same section position.
Spring longitudinal precompression LLongitudinal 0Is obtained by the following formula
max(|LLongitudinal 1+LLongitudinal 0|,|LLongitudinal 2+LLongitudinal 0|,|LLongitudinal 3+LLongitudinal 0|,|LLongitudinal 4+LLongitudinal 0|)＜LLongitudinal allowable use
In the formula, LLongitudinal 1Is the maximum longitudinal extension of the central line of the first longitudinal plane of the aluminum profile, LLongitudinal 2The maximum longitudinal extension of the central line of the second longitudinal plane of the aluminum profile, LLongitudinal 3The maximum longitudinal extension, L, of the central line of the third longitudinal plane of the aluminum profileLongitudinal 4The maximum longitudinal extension of the central line of the fourth longitudinal plane of the aluminum profile, LLongitudinal allowable useThe longitudinal allowable amount of expansion and contraction of the spring.
In the formula, LLongitudinal 1、LLongitudinal 2、LLongitudinal 3And LLongitudinal 4The spring length is equivalent to the length change amount of the four longitudinal plane center lines of the spring from the initial state to the bent state, but the longitudinal precompression of the spring is added to obtain the expansion and contraction amount of the four longitudinal plane center lines of the spring after bending.
Spring lateral precompression LHorizontal 0Is obtained by the following formula
max(|LCross 1+LHorizontal 0|,|LHorizontal bar 2+LHorizontal 0|)＜LAllowed to use horizontally
In the formula, LCross 1Is the maximum longitudinal extension of the first central line of the transverse plane of the aluminum profile, LHorizontal bar 2The maximum longitudinal extension of the second central line of the transverse plane of the aluminum profile, the central line of the first transverse plane is vertical to the central line of the second transverse plane, and L isAllowed to use horizontallyThe allowable transverse expansion of the spring. Because the spring is a rectangular spring, and the cross section of the spring is rectangular, the central line of the first transverse plane and the central line of the second transverse plane are respectively parallel to four sides of the spring pairwise.
5. And determining the length of the flexible adjusting wire drawing according to the length of the spring and the maximum allowable expansion and contraction amount. The length of the flexible adjusting wire is greater than the sum of the length of the spring and the maximum allowable expansion and contraction amount. This ensures that the flexible adjustment wires can adjust the spring to the maximum elastic elongation.
Claims (10)
1. The utility model provides an aluminium alloy stretch bending plug structure which characterized in that: including first rubber housing (1) and second rubber housing (2) that can dismantle the connection, the middle part of first rubber housing (1) is equipped with first cavity (103), the middle part of second rubber housing (2) is equipped with second cavity (203), first cavity (103) with be equipped with spring (3) in second cavity (203), the both ends of spring (3) all with limiting plate (4) spacing cooperation, two connect through adjustment mechanism between limiting plate (4), adjustment mechanism is used for adjusting the distance between two limiting plate (4).
2. The aluminum profile stretch-bending mandrel structure according to claim 1, characterized in that: and a first transverse flexible wire drawing (7) and a second transverse flexible wire drawing (8) which are perpendicular to each other are connected to the inner circle of each circle of the spring (3).
3. The aluminum profile stretch-bending mandrel structure according to claim 2, characterized in that: the two ends of the first transverse flexible drawn wire (7) and the second transverse flexible drawn wire (8) are connected with adjusting screw rods (9), each circle of the inner circle of the spring (3) is provided with a fixing nut (10), and the fixing nuts (10) are in threaded fit with the adjusting screw rods (9).
4. The aluminum profile stretch-bending mandrel structure according to claim 3, characterized in that: the spring (3) is a rectangular spring, the corner of the rectangular spring is a transition arc section, and the side lengths of the transverse flexible drawn wire (7), the longitudinal flexible drawn wire (8) and the rectangular spring are respectively two by two parallel.
5. The aluminum profile stretch-bending mandrel structure according to claim 1, characterized in that: the adjusting mechanism comprises a flexible adjusting wire drawing (5) and an adjusting nut (6), and the two ends of the flexible adjusting wire drawing (5) are in threaded fit with the adjusting nut (6) after penetrating through the limiting plate (4).
6. The aluminum profile stretch-bending mandrel structure according to claim 1, characterized in that: the two ends of the first rubber housing (1) are provided with first connectors (101), the first connectors are provided with connecting holes (102), the two ends of the second rubber housing (2) are provided with second connectors (201), and the second connectors (201) are connected with the connecting holes through connecting bolts (202).
7. A design method of an aluminum profile stretch bending mandrel structure based on any one of the claims 1 to 6 is characterized by comprising the following steps: the method comprises the steps of equating the stretching amount of a bending section of an aluminum profile to the stretching amount of a spring, obtaining the maximum longitudinal stretching amount, the maximum transverse stretching amount and the maximum bending stress of the aluminum profile through bending simulation analysis of the aluminum profile, obtaining the length, the diameter and the elastic coefficient of the spring and the longitudinal allowable stretching amount and the transverse allowable stretching amount of the spring according to the maximum bending stress, obtaining the longitudinal precompression amount of the spring according to the maximum longitudinal stretching amount and the longitudinal allowable stretching amount of the aluminum profile, and obtaining the transverse precompression amount of the spring according to the maximum transverse stretching amount and the transverse allowable stretching amount of the aluminum profile.
8. The design method of the aluminum profile stretch-bending mandrel structure according to claim 7, characterized in that: the method for determining the longitudinal pre-compression amount of the spring further comprises the steps that the maximum longitudinal expansion amount of the aluminum profile comprises the maximum longitudinal expansion amount of the central lines of four longitudinal planes of the aluminum profile, the maximum longitudinal expansion amount of the spring is obtained according to the maximum longitudinal expansion amount of the central lines of the four longitudinal planes of the aluminum profile and the preset longitudinal pre-compression amount of the spring, and the preset longitudinal pre-compression amount of the spring is obtained according to the relation that the absolute value of the maximum longitudinal expansion amount of the spring is smaller than the longitudinal allowable expansion amount of the spring.
9. The design method of the aluminum profile stretch-bending mandrel structure according to claim 7, characterized in that: the method comprises the steps of obtaining the initial length of an aluminum profile bending section by performing bending simulation analysis on the aluminum profile, and determining the length of a core rod according to the initial length of the aluminum profile bending section.
10. The design method of the aluminum profile stretch-bending mandrel structure according to claim 7, characterized in that: and determining the length of the flexible adjusting wire drawing according to the length of the spring and the maximum allowable expansion and contraction amount.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111540975.XA CN114346022B (en) | 2021-12-16 | 2021-12-16 | Aluminum profile stretch bending core rod structure and design method |
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| CN202111540975.XA CN114346022B (en) | 2021-12-16 | 2021-12-16 | Aluminum profile stretch bending core rod structure and design method |
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| CN114346022A true CN114346022A (en) | 2022-04-15 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006040061A1 (en) * | 2006-08-26 | 2008-02-28 | Boris Bergmann | Method for bending of hollow sections or tubes by flexible rod, comprises configuring the diameter of rod for the adjustment of workpiece of different diameter and/or for inserting and/or removing into and/or from workpiece to be bent |
| WO2008061762A2 (en) * | 2006-11-23 | 2008-05-29 | Tracto-Technik Gmbh & Co. Kg | Device for clamping hollow profiles |
| CN103240311A (en) * | 2013-05-27 | 2013-08-14 | 倪慨宇 | Flexibility core rod for stretching hollow metal tube section bar to be bent |
| CN108580619A (en) * | 2018-04-28 | 2018-09-28 | 浙江大学 | A kind of bend pipe plug of variable-diameter |
| CN110102618A (en) * | 2019-05-13 | 2019-08-09 | 浙江大学 | One kind is for the curved elastic dual-gripper variable diameter plug of aircraft engine metal catheter |
-
2021
- 2021-12-16 CN CN202111540975.XA patent/CN114346022B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006040061A1 (en) * | 2006-08-26 | 2008-02-28 | Boris Bergmann | Method for bending of hollow sections or tubes by flexible rod, comprises configuring the diameter of rod for the adjustment of workpiece of different diameter and/or for inserting and/or removing into and/or from workpiece to be bent |
| WO2008061762A2 (en) * | 2006-11-23 | 2008-05-29 | Tracto-Technik Gmbh & Co. Kg | Device for clamping hollow profiles |
| CN103240311A (en) * | 2013-05-27 | 2013-08-14 | 倪慨宇 | Flexibility core rod for stretching hollow metal tube section bar to be bent |
| CN108580619A (en) * | 2018-04-28 | 2018-09-28 | 浙江大学 | A kind of bend pipe plug of variable-diameter |
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Non-Patent Citations (1)
| Title |
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| 申世军;杨合;李恒;詹梅;: "薄壁管小弯曲半径数控绕弯成形芯模效用的实验研究", 塑性工程学报, no. 04 * |
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