CN110614302A - Multi-roller-based hollow member free bending forming device and technological parameter analysis method - Google Patents
Multi-roller-based hollow member free bending forming device and technological parameter analysis method Download PDFInfo
- Publication number
- CN110614302A CN110614302A CN201911034866.3A CN201911034866A CN110614302A CN 110614302 A CN110614302 A CN 110614302A CN 201911034866 A CN201911034866 A CN 201911034866A CN 110614302 A CN110614302 A CN 110614302A
- Authority
- CN
- China
- Prior art keywords
- forming
- roller
- bending
- section
- forming roller
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/08—Bending rods, profiles, or tubes by passing between rollers or through a curved die
Abstract
The invention discloses a hollow member free bending forming device based on multiple rollers and a process parameter analysis method, wherein three pairs of rollers and a forming roller on the same horizontal line are arranged at the front end of a blank, the number relations among geometric shape parameters of a straight section, a transition section and a bending section of the axis of the blank, the movement speed u of the forming roller in an XY plane, the feeding speed v of the blank in a Z direction, the movement time t, the distance D between the center of the forming roller and the center of a pair of guide rollers at the front end and the radius H of the roller are established, and then the obtained movement parameters of the forming roller are transmitted to a multi-roller free bending forming device, so that the free bending forming of a hollow member is completed under the combined action of the rollers and a motor. The hollow member free bending forming system based on the multiple rollers simplifies the structure of the guide device, the direction of the bending force is vertical to the axis in real time, and the contact stress is effectively reduced.
Description
Technical Field
The invention belongs to the technical field of free bending forming of hollow members, and particularly relates to a multi-roller-based free bending forming device for hollow members and a technological parameter analysis method.
Background
The bending pieces with various cross-sectional shapes have wide application in various fields such as aerospace, nuclear engineering, automobile manufacturing, ship manufacturing, petrochemical industry and other civil industries. For the bending hollow component, the space configuration of the complex bending component with the variable bending radius and the axis of the complex bending component which is a plane or a space curve is more flexible. The research on the manufacturing of the component can effectively reduce the production cost of the national defense industry and the civil industry, and has very important significance for reducing the weight of key system parts in the related field.
At present, the main processes for producing the hollow member comprise bending, stretch bending and press bending and bending forming processes derived from the processes, and the practical production defects of the hollow member are that a mould needs to be replaced every time the hollow member is bent at a bending section with different bending radius, so that the production efficiency is greatly reduced. In addition, in the case of a complex member having a variable bending radius and an axis of a plane or a spatial curve, the bending configuration is limited, and high-precision bending of the complex member cannot be achieved.
Disclosure of Invention
The invention provides a multi-roller-based hollow member free bending forming process parameter analysis method aiming at the defects of the traditional hollow member bending technology. The method comprises the steps of firstly segmenting the axis of the hollow component, then supplementing a transition section, establishing a quantitative relation between the geometric axis of different sections and forming process parameters, and finally transmitting the process parameters to multi-roller-based free bending forming equipment to finally obtain the bent hollow component with high dimensional precision.
The invention adopts the following technical scheme:
a hollow member free bending forming device based on multiple rollers comprises three pairs of guide rollers and more than three pairs of guide rollers and a forming roller, wherein the three pairs of guide rollers and more than three pairs of guide rollers form a guide roller group, the guide roller group ensures that the central axis of a blank is always on the same straight line in the feeding process, the forming roller is connected with a free arm servo motor, the arm servo motor controls the forming roller to finish the translational motion and the rotational motion in a space, and when a propelling mechanism at the tail part of the blank pushes the blank to reach the forming roller group, the free arm servo motor controls the spatial posture of the forming roller to apply forming acting force to the blank, so that the multiple-roller free bending forming of the hollow member is finished.
The forming roller comprises the following motion forming processes: the forming roller rotates around the axis of the pipe in the X-axis/Y-axis plane and moves linearly up and down, left and right in the X-axis/Y-axis plane, and the pipe can generate plane bending characteristics in any direction; meanwhile, the forming roller rotates for a certain displacement in the Z-axis direction, and the pipe can generate space bending characteristics.
According to the multi-roller-based free bending forming device for the hollow member, three pairs of guide rollers (1) are arranged behind a pushing mechanism along the pushing direction of the pushing mechanism, a forming roller (2) is arranged behind the guide rollers, and when the pushing mechanism pushes a blank to reach the forming roller (2), the forming roller (2) applies bending acting force to the blank to complete multi-roller free bending forming of the hollow member.
According to the multi-roller-based free bending forming device for the hollow member, the roller radius of the forming roller is equal to or larger than the pipe radius.
The method for analyzing the forming process parameters of the free bending forming device of the hollow member comprises the following steps:
firstly, extracting the geometric axis of the complex hollow component;
secondly, decomposing the geometric axis of the complex hollow component, wherein the geometric axis comprises a straight section and a bent section;
thirdly, supplementing transition sections among different bending sections; the device comprises an initial transition section and a return transition section, wherein the initial transition section is used for supplementing transition from a straight section to a bent section and the return transition section is used for supplementing transition from the bent section to a straight section;
fourthly, establishing the length L of the straight section including the straight section, the transition section and the bending sectionStraight barThe geometrical parameters including the bending radius R and the bending angle theta are related to the quantity among the moving speed u of the forming roller (2) in the XY plane, the feeding speed v of the blank Z direction, the moving time t, the distance D between the center of the forming roller and the center of the front pair of guide rollers and the roller radius H.
The fourth step is a specific method of analyzing the forming process parameters, which comprises the following steps:
straight section: the moving speed u of the forming roller (2) is 0, and the moving time isThe blank keeps constant speed v along the Z-direction feeding speed;
initial transition section: speed of movement of the forming roller (2)Time of exercise
Bending section: the moving speed u of the forming roller (2) is 0, and the moving time isWherein
And (3) returning to the transition section: speed of movement of the forming roller (2)Time of exercise
Advantageous effects
1. The invention is a matching process parameter analysis method of a multi-roller-based hollow member free bending forming system, which fully exerts the advantage that the system can realize the bending forming of hollow members with different bending radiuses only by means of the posture adjustment of a forming roller;
2. the guide device is three pairs of fixed rollers on the same horizontal line, so that the structure of the guide device is simplified; the contact angle between the forming roller and the blank can reach 180 degrees, the direction of the bending force is vertical to the axis in real time, and the contact stress is effectively reduced;
3. the method is simple and feasible, has high production efficiency, and has important engineering application value and obvious economic benefit in the engineering fields of aviation, aerospace, automobile manufacturing and the like.
The main body of the multi-roller free bending forming device comprises three pairs of guide rollers and one forming roller, wherein the three pairs of guide rollers can ensure that the central axis of a blank is always in a straight line in the feeding process, and the forming roller is externally connected with a free arm servo motor and can control the forming roller to finish translational motion and rotational motion in a space. The working principle of the equipment is that when a pushing mechanism at the tail of the blank pushes the blank to reach a forming roller, a free arm servo motor controls the space posture of the forming roller, forming acting force is applied to the blank, and multi-roller free bending forming of the hollow component is completed. The multi-roller-based hollow member free bending forming system can realize the roll bending forming of hollow members with different bending radiuses by means of the posture adjustment of the forming rollers, can effectively reduce the production cost, and has very important innovative significance for the production of hollow members with complex shapes.
Drawings
FIG. 1 is a schematic view of a multi-roll based freeform bend forming apparatus;
in the figure: 1-guide roller; 2-forming rollers; 3, blank;
FIG. 2 is a schematic diagram of analysis of parameters of a multi-roll based free bend forming process;
FIG. 3 is a schematic size diagram of an example parameter analysis of a multi-roller free bending forming process for a U-shaped elbow;
FIG. 4 is a schematic view, in section, of the axis of the "U" bend;
in the figure: 4- "first straight section", 5- "first transition section", 6- "first bending section", 7- "second transition section", 8- "second straight section", 9- "third transition section", 10- "second bending section", 11- "fourth transition section", 12- "third straight section".
Detailed Description
Referring to fig. 1, a hollow member free bending forming device based on multiple rollers comprises three pairs of guide rollers and a forming roller, wherein the three pairs of guide rollers form a guide roller group, the guide roller group ensures that the central axis of a blank is always on the same straight line in the feeding process, the forming roller is connected with a free arm servo motor, the arm servo motor controls the forming roller to complete translation and rotation movement in space, when a pushing mechanism at the tail of the blank pushes the blank to reach the forming roller group, the free arm servo motor controls the space posture of the forming roller, forming acting force is applied to the blank, the direction of the forming acting force is vertical to the axis of a pipe in real time, and the multiple-roller free bending forming of the hollow member is completed.
The forming roller comprises the following motion forming processes: the forming roller rotates around the axis of the pipe in the X-axis/Y-axis plane and moves linearly up and down, left and right in the X-axis/Y-axis plane, and the pipe can generate plane bending characteristics in any direction; meanwhile, the forming roller rotates for a certain displacement in the Z-axis direction, and the pipe can generate space bending characteristics.
Three pairs of guide rollers (1) are arranged behind the propelling mechanism along the propelling direction of the propelling mechanism, a forming roller (2) is arranged behind the guide rollers, and when the propelling mechanism pushes the blank to reach the forming roller (2), the forming roller (2) applies bending acting force to the blank to finish multi-roller free bending forming of the hollow member.
The radius of the forming roller is equal to or larger than that of the pipe, and the contact angle between the forming roller and the blank can reach 180 degrees.
The present invention is described in detail below with reference to specific examples of "U" bends.
The embodiment of the invention adopts a multi-roller-based free bending forming system, which comprises a forming roller, a guide roller, a servo motor and the like, wherein the forming roller moves in an XY plane under the driving action of the servo motor.
Firstly, extracting the geometric axis of the U-shaped bent pipe in the figure 3;
secondly, dividing the axis into three straight sections and two curved sections, as shown in fig. 4, respectively: a first straight section 4, a second straight section 8, a third straight section 12, a first curved section 6, a second curved section 10;
thirdly, as shown in fig. 4, the transition section is supplemented between the straight section and the bending section, and since the U-shaped bent pipe has a bilateral symmetry structure, there are 4 transition sections in the bent pipe: the process parameters of the first transition section 5, the second transition section 7, the third transition section 9 and the fourth transition section 11 are completely consistent, and the process parameters of the first transition section 5, the fourth transition section 11, the second transition section 7 and the third transition section 9 are completely consistent;
fourthly, the feeding speed v of the pipe Z in the direction is 10mm/s, the distance D between the center of the forming roller and the center of the foremost pair of guide rollers is 35mm, and the radius H of the rollers is 13 mm. Establishing the quantitative relations among the geometric parameters of the straight section, the first transition section, the bent section and the second transition section, namely the bending radius R and the bending angle theta, the movement speed u and the movement time t of the forming roller as follows:
the first straight section 4: the forming roller is fixed, the pipe is axially fed at a constant speed, and the movement time delta t is 5.0 s;
first transition section 5: forward moving speed of forming roller to Y-axis
The movement time delta t is 3.05 s;
first bent segment 6: the forming roller is fixed, the pipe is axially fed at a constant speed, and the movement time delta t is 12.80 s;
second transition section 7: forming roll moving towards Y-axis negative directionThe movement time delta t is 3.0 s;
second straight section 8: the forming roller is fixed, the pipe is axially fed at a constant speed, and the movement time delta t is 4.0s
Third transition section 9: forward moving speed of forming roller to Y-axis The movement time delta t is 3.05 s;
second curved section 10: the forming roller is fixed, the pipe is axially fed at a constant speed, and the movement time delta t is 12.80s
Fourth transition section 11: speed of forming roller moving towards Y-axis negative directionThe movement time delta t is 3.0 s;
third straight section 12: the forming roller is fixed, the pipe is axially fed at a constant speed, and the movement time delta t is 2.0s
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (6)
1. A hollow member free bending forming device based on multiple rollers is characterized by comprising three pairs of guide rollers and more than three pairs of guide rollers and a forming roller, wherein the three pairs of guide rollers and more than three pairs of guide rollers form a guide roller group, the guide roller group ensures that the central axis of a blank is always on the same straight line in the feeding process, the forming roller is connected with a free arm servo motor, the arm servo motor controls the forming roller to complete translation and rotation movement in space, and when a pushing mechanism at the tail of the blank pushes the blank to reach the forming roller group, the free arm servo motor controls the space posture of the forming roller to apply forming acting force to the blank, so that the multiple-roller free bending forming of the hollow member is completed.
2. The multi-roll based hollow member free-form sweep forming apparatus of claim 1 wherein the forming rollers include the following kinematic forming processes: the forming roller rotates around the axis of the pipe in the X-axis/Y-axis plane and moves linearly up and down, left and right in the X-axis/Y-axis plane, and the pipe can generate plane bending characteristics in any direction; meanwhile, the forming roller rotates for a certain displacement in the Z-axis direction, and the pipe can generate space bending characteristics.
3. The device for freely bending and forming the hollow member based on the multiple rollers as claimed in claim 1, wherein along the advancing direction of the advancing mechanism, three pairs of guide rollers (1) are arranged behind the advancing mechanism, a forming roller (2) is arranged behind the guide rollers, and when the advancing mechanism pushes the blank to reach the forming roller (2), the forming roller (2) applies bending force to the blank to complete the multiple-roller free bending and forming of the hollow member.
4. The multiple roll-based hollow member free-form sweep forming apparatus of claim 1 wherein the forming rolls have a roll radius equal to or greater than the tube radius.
5. The method for analyzing the parameters of the forming process of the apparatus for freely bending and forming a hollow member according to any one of claims 1 to 4, comprising the steps of:
firstly, extracting the geometric axis of the complex hollow component;
secondly, decomposing the geometric axis of the complex hollow component, wherein the geometric axis comprises a straight section and a bent section;
thirdly, supplementing transition sections among different bending sections; the device comprises an initial transition section and a return transition section, wherein the initial transition section is used for supplementing transition from a straight section to a bent section and the return transition section is used for supplementing transition from the bent section to a straight section;
fourthly, establishing the length L of the straight section including the straight section, the transition section and the bending sectionStraight barThe geometrical parameters including the bending radius R and the bending angle theta are related to the quantity among the moving speed u of the forming roller (2) in the XY plane, the feeding speed v of the blank Z direction, the moving time t, the distance D between the center of the forming roller and the center of the front pair of guide rollers and the roller radius H.
6. The method for analyzing parameters of a forming process according to claim 5, wherein the fourth step is a specific method comprising:
straight section: the moving speed u of the forming roller (2) is 0, and the moving time isThe blank keeps constant speed v along the Z-direction feeding speed;
initial transition section: speed of movement of the forming roller (2)Time of exercise
Bending section: the moving speed u of the forming roller (2) is 0, and the moving time isWherein
And (3) returning to the transition section: speed of movement of the forming roller (2)Time of exercise
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911034866.3A CN110614302A (en) | 2019-10-29 | 2019-10-29 | Multi-roller-based hollow member free bending forming device and technological parameter analysis method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911034866.3A CN110614302A (en) | 2019-10-29 | 2019-10-29 | Multi-roller-based hollow member free bending forming device and technological parameter analysis method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110614302A true CN110614302A (en) | 2019-12-27 |
Family
ID=68926912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911034866.3A Pending CN110614302A (en) | 2019-10-29 | 2019-10-29 | Multi-roller-based hollow member free bending forming device and technological parameter analysis method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110614302A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111580464A (en) * | 2020-05-20 | 2020-08-25 | 南京航空航天大学 | Method for analyzing forming track of three-dimensional constant curvature member freely bent by multiple rollers |
| CN112916685A (en) * | 2020-12-23 | 2021-06-08 | 凌云工业股份有限公司 | Pipe beam composite radius bending forming device |
| CN114515778A (en) * | 2022-01-27 | 2022-05-20 | 南京航空航天大学 | Composite bending forming process analysis method and device based on industrial robot |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2927145A1 (en) * | 1979-07-05 | 1981-01-08 | Rofo Rohrbogen Und Formstuecke | Pipe bending machine with two guide rollers - has freely rotatable support roller and freely rotatable bending roller opposite guide rollers |
| DE10330753A1 (en) * | 2003-07-07 | 2005-02-10 | Rosenberger Ag | Bending machine esp. for tubes has two bending heads with associated roll bending heads to form integrated units |
| CN102489564A (en) * | 2011-11-24 | 2012-06-13 | 上海第二工业大学 | Device and method for realizing spatial three-dimensional variable curvature bending of pipe |
| WO2013132912A1 (en) * | 2012-03-07 | 2013-09-12 | 本田技研工業株式会社 | Three-dimensional hot bending device |
| CN106270059A (en) * | 2016-11-08 | 2017-01-04 | 南京航空航天大学 | A kind of metal complex component 3D free bend forming technology optimization method |
| CN106475445A (en) * | 2016-11-08 | 2017-03-08 | 南京航空航天大学 | A kind of metal pipe material 3D free bend manufacturing process and five axle free bend equipment |
| CN107931416A (en) * | 2017-09-26 | 2018-04-20 | 南京航空航天大学 | A kind of device and method of spinning tube reducing and space free bend synchronous forming |
| CN107052110B (en) * | 2017-05-10 | 2018-11-09 | 南京航空航天大学 | Variable cross-section three-dimensional complex component part spinning and 3 D auto roll bending synthesis building mortion and method |
-
2019
- 2019-10-29 CN CN201911034866.3A patent/CN110614302A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2927145A1 (en) * | 1979-07-05 | 1981-01-08 | Rofo Rohrbogen Und Formstuecke | Pipe bending machine with two guide rollers - has freely rotatable support roller and freely rotatable bending roller opposite guide rollers |
| DE10330753A1 (en) * | 2003-07-07 | 2005-02-10 | Rosenberger Ag | Bending machine esp. for tubes has two bending heads with associated roll bending heads to form integrated units |
| CN102489564A (en) * | 2011-11-24 | 2012-06-13 | 上海第二工业大学 | Device and method for realizing spatial three-dimensional variable curvature bending of pipe |
| WO2013132912A1 (en) * | 2012-03-07 | 2013-09-12 | 本田技研工業株式会社 | Three-dimensional hot bending device |
| CN106270059A (en) * | 2016-11-08 | 2017-01-04 | 南京航空航天大学 | A kind of metal complex component 3D free bend forming technology optimization method |
| CN106475445A (en) * | 2016-11-08 | 2017-03-08 | 南京航空航天大学 | A kind of metal pipe material 3D free bend manufacturing process and five axle free bend equipment |
| CN107052110B (en) * | 2017-05-10 | 2018-11-09 | 南京航空航天大学 | Variable cross-section three-dimensional complex component part spinning and 3 D auto roll bending synthesis building mortion and method |
| CN107931416A (en) * | 2017-09-26 | 2018-04-20 | 南京航空航天大学 | A kind of device and method of spinning tube reducing and space free bend synchronous forming |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111580464A (en) * | 2020-05-20 | 2020-08-25 | 南京航空航天大学 | Method for analyzing forming track of three-dimensional constant curvature member freely bent by multiple rollers |
| CN111580464B (en) * | 2020-05-20 | 2021-06-29 | 南京航空航天大学 | Method for analyzing forming track of three-dimensional constant curvature member freely bent by multiple rollers |
| CN112916685A (en) * | 2020-12-23 | 2021-06-08 | 凌云工业股份有限公司 | Pipe beam composite radius bending forming device |
| CN114515778A (en) * | 2022-01-27 | 2022-05-20 | 南京航空航天大学 | Composite bending forming process analysis method and device based on industrial robot |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110614302A (en) | Multi-roller-based hollow member free bending forming device and technological parameter analysis method | |
| CN106270059B (en) | A kind of metal complex component 3D free bend forming technology optimization methods | |
| Liang et al. | Flexible 3D stretch-bending technology for aluminum profile | |
| CN106862330B (en) | Six axis free bend Forming Equipments of special-shaped cross section metal hollow unit and analytic process method | |
| CN107052110B (en) | Variable cross-section three-dimensional complex component part spinning and 3 D auto roll bending synthesis building mortion and method | |
| Cai et al. | Principle and theoretical analysis of continuous roll forming for three-dimensional surface parts | |
| CN106903191A (en) | A kind of complex components three-dimensional free bend manufacturing process based on polypody parallel robot | |
| CN107931383B (en) | Three-dimensional free bending and numerical control winding composite forming equipment | |
| CN107234443B (en) | Three-dimensional variable-curvature section bar on-line bending forming device actively drawn by robot | |
| CN102366770B (en) | Design method of stretch bending loading trace of novel stretch bender | |
| CN102489564A (en) | Device and method for realizing spatial three-dimensional variable curvature bending of pipe | |
| Peng et al. | Kinetic locus design for longitudinal stretch forming of aircraft skin components | |
| Wang et al. | Continuous-forming method for three-dimensional surface parts combining rolling process with multipoint-forming technology | |
| CN107931416B (en) | Device and method for synchronous forming of spinning diameter reduction and space free bending | |
| CN110369548A (en) | A kind of titanium alloy is seamless square and rectangular pipe and its manufacturing method and application | |
| Zhou et al. | Residual stress and springback analysis for 304 stainless steel tubes in flexible-bending process | |
| Liang et al. | Effect of roller dies on springback law of profile for flexible 3D multi-point stretch bending | |
| CN111085580A (en) | Continuous free bending accurate forming method | |
| Staupendahl et al. | The reciprocal effects of bending and torsion on springback during 3D bending of profiles | |
| CN108723142B (en) | Flexible forming method for space straight-section-free complex-bending hollow component | |
| CN107944155A (en) | The 3 D auto bending process analysis method of section bar | |
| CN108723131B (en) | A kind of metal tube variable curvature bending method based on eccentric wheel | |
| CN207655684U (en) | A kind of preparation facilities being adapted to 3 D auto bending forming titanium alloy tube | |
| Zhou et al. | Application and correction of L-shaped thin-wall aluminum in flexible-bending processing | |
| CN113579022A (en) | Parallel-track type intelligent robot composite bending forming processing method and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20200616 Address after: Yudaojie Qinhuai District of Nanjing City, Jiangsu Province, No. 29 211106 Applicant after: Nanjing University of Aeronautics and Astronautics Applicant after: NANJING GOLDEN DRAGON BUS Co.,Ltd. Address before: Yudaojie Qinhuai District of Nanjing City, Jiangsu Province, No. 29 211106 Applicant before: Nanjing University of Aeronautics and Astronautics |
|
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191227 |