CN102941260A - Bending blank manufacturing method for beta-phase titanium alloy flash welding thin-wall ring profiles - Google Patents
Bending blank manufacturing method for beta-phase titanium alloy flash welding thin-wall ring profiles Download PDFInfo
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- CN102941260A CN102941260A CN2012104804953A CN201210480495A CN102941260A CN 102941260 A CN102941260 A CN 102941260A CN 2012104804953 A CN2012104804953 A CN 2012104804953A CN 201210480495 A CN201210480495 A CN 201210480495A CN 102941260 A CN102941260 A CN 102941260A
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Abstract
The invention discloses a bending blank manufacturing method for beta-phase titanium alloy flash welding thin-wall ring profiles. The method comprises the steps that a beta-phase titanium alloy profile fed according to specifications is divided into five segments of mn, no, op, pq and qw, heated to a temperature of 800 DEG C+/-20 DEG C and fed in a bending machine for positioning. The op segment is bent, rotation linear speeds of an upper roller and two lower rollers are 2400 mm/min, the upward moving speeds of the two lower rollers are 7.5 mm/min, the bending is repeated for 4 times, and the op arc segment at this moment achieves a preset curvature radius; and the no segment and the pq segment are bent, the rotation linear speeds of the upper roller and the two lower rollers are 1200 mm/min, the downward moving speeds of the two lower rollers are 9.5 mm/min, the bending is repeated for 4 times, and the no and pq arc segments at this moment achieve preset curvature radii. The profile is bent and deformed into a D-shaped ring blank, two straight sides and an arc portion of the ring blank are connected through a transition arc segment, and phenomena of bent angles at connection positions of the two straight sides and the arc portion and indentations on the surface of the ring blank are eliminated.
Description
Technical field
The present invention relates to a kind of bending method of section bar, particularly related to the shape bending blank-making method of beta titanium alloy flash welding thin-walled ring.
Background technology
Along with the increase of the industries such as Aeronautics and Astronautics, boats and ships, gas turbine, wind energy, nuclear energy and bearing to the ring demand, the ring that adopts traditional milling method to be shaped is large owing to machine-finish allowance, stock utilization is low, not only waste a large amount of materials, but also make the cost of ring high.And the ring of employing Flash Butt Welding explained hereafter, it is few that machine adds surplus, and stock utilization is high, and cost also reduces thereupon greatly, is conducive to make ring to be shaped towards the Precision Forming Technology future development.The technology of preparing of flash of light weld-ring base is one of key technology of producing the flash welding ring.
Mainly adopt following methods for the preparation of flash of light weld-ring base in the prior art: bend to approximate circle on the bending machine of first section bar being packed into, and respectively stay one section straight flange at section bar two ends position; On the type machine of school, straight portion and the circular arc portion of section bar bent to a knuckle again, the straight flange at section bar two ends is alignd mutually, be convenient to flash butt welder to the clamping of ring base and weld.Adopt the flash of light weld-ring base of said method preparation, can produce knuckle at the circular arc portion of ring base and the junction of two ends straight portion, produce easily impression on the surface of ring base; Described ring base is after flash welding is configured as ring, need to carry out bulging school circle processes, the knuckle place produces easily stress and concentrates and to be caused ring to be scrapped by spalling during bulging, the school bowlder, need a large amount of man-hour and the energy consumptions of cost that knuckle is repaired, and can not be completely eliminated, the whole ovality of ring is larger behind the circle of school; Because the allowance of flash welding ring is less, the ring ovality reaches more greatly the surface and exists impression all can affect the dimensional accuracy of ring, causes dimensional accuracy low, is unfavorable for obtaining few flash welding ring without surplus processing.
Summary of the invention
The technical problem to be solved in the present invention provides the crooked base that a kind of method of on bending machine section bar being carried out the segmentation bending realizes beta titanium alloy flash welding thin-walled ring section bar, knuckle and impression that the method produces in the time of eliminating crooked beta titanium alloy section bar are conducive to improve flash welding ring dimensional accuracy and crudy.
For solving the problems of the technologies described above, the shape bending blank-making method of beta titanium alloy flash welding thin-walled ring of the present invention, its technical scheme may further comprise the steps:
Beta titanium alloy section bar by the specification blanking is divided into five sections of mn, no, op, pq and qw, and the ratio of described each section is
Mn:
No:
Op:
Pq:
Qw=
1.0:
2.0 ~ 2.5:
7.0 ~ 8.0:
2.0 ~ 2.5:
1.0, more described section bar is heated to 800 ℃ ± 20 ℃;
Described section bar is put into bending machine, by top roll and two lower rolls of bending machine it is positioned, make the center of described section bar and the center-aligned of described top roll, described top roll and two lower rolls are positioned at the op section of described section bar;
Control that described top roll rotates in the counterclockwise direction, two lower rolls are rotated in a clockwise direction, driving section bar moves to its right-hand member direction, simultaneously the power of two lower rolls loading 158KN made its top die mould material that moves up, when the lower-left roller contacts with the o point of section bar, change the direction of rotation of top roll and two lower rolls, drive section bar and move to its left end direction; When the bottom right roller contacts with the p point of section bar, change again the direction of rotation of top roll and two lower rolls, drive section bar and move to its right-hand member direction, until top roll contacts with the mid point of section bar op section; Two lower rolls top die mould material that always moves up all the time in the BENDING PROCESS; The rotational line speed of described upper and lower roll is 2400mm/min, and the speed that described two lower rolls move up is 7.5mm/min; Repeat aforesaid operations 4 times, at this moment, the op arc section reaches predetermined radius of curvature;
Shut down to detect the temperature of described section bar, if continue bending operation during more than or equal to 600 ℃, if less than 600 ℃, melt down continue again after being heated to 800 ℃ ± 20 ℃ crooked;
The no section of described section bar is positioned at the center-aligned that makes its mid point and top roll on the bending machine; Control that top roll is rotated in a clockwise direction, two lower rolls rotate in the counterclockwise direction, drive section bar and move to its left end direction, the power that simultaneously two lower rolls is loaded 230KN makes its top die mould material that moves up; When the bottom right roller contacts with the o point of section bar, change the direction of rotation of top roll and two lower rolls, drive section bar and move to its right-hand member direction; When the lower-left roller contacts with the n point of section bar, change again the direction of rotation of top roll and two lower rolls, drive section bar and move to its left end direction, until top roll contacts with the mid point of the no section of section bar; Two lower rolls top die mould material that always moves up all the time in the BENDING PROCESS; The rotational line speed of described upper and lower roll is 1200mm/min, and the speed that described two lower rolls move up is 9.5mm/min; Repeat aforesaid operations 4 times, at this moment, the no arc section reaches predetermined radius of curvature;
By the crooked pq section of the step of above-mentioned crooked no section, until the pq arc section after the bending reaches predetermined radius of curvature, the mn section of described section bar and the alignment of qw section.
Preferably, the radius of curvature of described each crooked arc section is determined by following formula:
In the formula:
R---the radius of curvature (mm) of crooked rear corresponding circle segmental arc;
Centre distance (mm) between a---two lower rolls;
δ---the distance (mm) that lower roll rises during crooked corresponding circle segmental arc;
The radius of r---lower roll (mm);
The thickness of d---section bar (mm).
Preferably, the rotary speed of the speed that moves up of described lower roll and described upper and lower roll is determined by following formula:
In the formula:
V
2---the speed (mm/min) that lower roll moves up during crooked corresponding circle segmental arc;
V
1---the rotary speed of top roll or lower roll (mm/min) during crooked corresponding segmental arc;
R---the radius of curvature (mm) of crooked rear corresponding circle segmental arc;
δ---the distance (mm) that lower roll rises during crooked corresponding circle segmental arc;
The number of times (inferior) of n---corresponding circle segmental arc repeated flex.
Preferably, described bending machine loads to can the move up minimum force of top die mould material of lower roll and is determined by following formula:
In the formula:
F---bending machine loads to can the move up minimum force (N) of top die mould material of lower roll;
The rigidity of EJ---bar.Wherein, E is elastic modelling quantity (GPa), and J is the cross section moments of inertia (cm of bar
4);
Centre distance (mm) between a---two lower rolls;
The distance that δ---lower roll moves up (mm).
Preferably, described β two titanium alloys are TB2.
Preferably, the axial cross section size maximum of described ring is 65mm * 30mm.
Adopt the ring base of the flash welding thin-walled ring of described method bending forming to be " D " font, be comprised of two straight flanges, arc sections and the excessive arc section that connects described straight flange and arc sections, relative position, end has opening between two straight flanges.
Compared with prior art, beneficial effect of the present invention is as follows:
The shape bending blank-making method of beta titanium alloy flash welding thin-walled ring of the present invention is divided into five sections of mn, no, op, pq and qw to described section bar in BENDING PROCESS, the ratio of described each section is
Mn:
No:
Op:
Pq:
Qw=
1.0:
2.0 ~ 2.5:
7.0 ~ 8.0:
2.0 ~ 2.5:
1.0, make the radius of curvature of crooked rear op section greater than the radius of curvature of no or pq section, be conducive to the ring base that flexural deformation and acquisition are " D " font.And two straight flanges of ring base are connected by the transition circle segmental arc with arc sections after crooked, eliminated two straight flanges and produced knuckle being connected of arc sections and encircling the surperficial phenomenon that produces impression of base, not only make the base process be easy to carry out, and the flash welding ring of having avoided welding forming knuckle place in follow-up bulging school sired results skill produce easily that stress is concentrated and problem that spalling causes ring to be scrapped; Simultaneously, also so that bulging school circle process is easy to carry out, can save a large amount of man-hours and energy consumption, eliminate ovality, improve dimensional accuracy and the crudy of ring, obtain few flash welding ring without surplus processing.
In described shape bending process, when the radius of curvature of each crooked arc section satisfies
, the rotary speed of the speed that lower roll moves up and top roll, lower roll satisfies
The time, can make smooth rounding off and bending forming between each crooked arc section.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is the ring base schematic diagram that adopts the flash welding thin-walled ring that prior art produces.
Fig. 2 is the structural representation of bending machine.
Fig. 3 is the segmentation schematic diagram of beta titanium alloy section bar.
Fig. 4 is the installation schematic diagram of beta titanium alloy section bar.
Fig. 5 is the BENDING PROCESS schematic diagram of beta titanium alloy section bar op section.
Fig. 6 is the BENDING PROCESS schematic diagram of beta titanium alloy section bar no section.
Fig. 7 is the view after the beta titanium alloy shape bending finishes.
Fig. 8 is the ring base schematic diagram that adopts the beta titanium alloy flash welding thin-walled ring that the present invention produces.
The specific embodiment
The shape bending blank-making method of implementing beta titanium alloy flash welding thin-walled ring of the present invention need to provide the equipment such as profile bender, heating furnace, manipulator.
Fig. 1 shows the schematic diagram of the ring base 10 of the beta titanium alloy flash welding thin-walled ring that adopts prior art production, this ring base 10 is comprised of two straight flanges 11 and arc sections 13, between two straight flanges, have opening 14, two straight flanges 11 respectively and the junction between the arc sections 13 form knuckle 12.
Fig. 2 shows the schematic diagram of bending machine, described bending machine 1 has top roll 2 and two lower rolls 3, described top roll 2 is installed on the bearing 5, described two lower rolls 3 are contained in respectively on two cranks 4 and can move up and down, and described top roll 2 and two lower roll 3 distributions triangular in shape also can be rotated clockwise or counterclockwise; This bending machine 1 also has the velocity of rotation of adjusting upper roll 2, two lower rolls 3 and the control device that two lower rolls 3 move up and down speed; The radius of described top roll 2 and two lower rolls 3 is 200mm, and the centre distance of two lower rolls 3 is 450mm.
The specific embodiment of the titanium alloy of the below take China's material trademark as TB2 shape bending blank-making method of beta titanium alloy flash welding thin-walled ring of the present invention as example describes in detail:
The main chemical elements content (percentage by weight) of this alloy is: contain Mo amount 4.7% ~ 5.7%, contain V amount 4.7% ~ 5.7%, contain Cr amount 7.5% ~ 8.5%, contain Al amount 2.5% ~ 3.5%, contain Fe amount≤0.30%, C content≤0.05, contain N amount≤0.04%, contain H amount 0.015%, contain O amount 0.15%, surplus is Ti, other element summation≤0.40.
The processing step of concrete crooked base is as follows:
Step 1: blanking.As shown in Figure 3, the cross section be rectangular TB2 titanium alloy material by specification blanking forming material 20, the length of this section bar 20 determines that according to the diameter dimension of welding ring its maximum secting area is the 65mm(width) * 30mm(thickness).This section bar 20 is divided into five sections of mn, no, op, pq and qw by m, n, o, p, q, w, for make crooked after the radius of curvature of op section be the ring base of " D " font greater than radius of curvature and the acquisition of no or pq section, the ratio of each section is
Mn:
No:
Op:
Pq:
Qw=
1.0:
2.0 ~ 2.5:
7.0 ~ 8.0:
2.0 ~ 2.5:
1.0, can take at section bar 20 methods such as marking that each section distinguished during segmentation.
Step 2: heating.Section bar 20 is heated to 800 ℃ ± 20 ℃, and temperature retention time is 6 min/10mm～8 min/10mm, and insulation total time is less than 2h.
Step 3: installation.As shown in Figure 4, section bar 20 is put into bending machine 1, the installation after section bar 20 lie in two lower rolls 3 above, the center-aligned of its center and top roll 2, described top roll 2 and two lower rolls 3 are positioned at the op section of section bar 20, control two lower rolls 3 of crank 4 promotions and move up, until section bar 20 contacts with top roll 2, by top roll 2 and two lower rolls 3 section bar 20 is positioned on the bending machine 1.
Step 4: the op section of bent section 20.As shown in Figure 5, control that top roll 2 rotates in the counterclockwise direction, two lower rolls 3 are rotated in a clockwise direction, driving section bar 20 moves to its right-hand member direction, described upper and lower roll 2 and 3 rotational line speed are 2400mm/min, simultaneously, the power that two lower rolls 3 is loaded 158KN makes its speed with 7.5mm/min top die mould material 20 that moves up; When lower-left roller 3 contacts with the o point of section bar 20, change the direction of rotation of top roll 2 and two lower rolls 3, drive section bar 20 and move to its left end direction, and the speed that the rotational line speed of top roll 2 and two lower rolls 3 of guaranteeing is constant and two lower rolls 3 move up is constant; When bottom right roller 3 contacts with the p point of section bar 20, change again the direction of rotation of top roll 2 and two lower rolls 3, driving section bar 20 moves to its right-hand member direction, and the speed that the rotational line speed that guarantees top roll 2 and two lower rolls 3 is constant and two lower rolls 3 move up is constant, until top roll 2 contacts with the mid point of the op section of section bar 20.Two lower rolls 3 top die mould material 20 that always moves up all the time in the BENDING PROCESS.Repeat aforesaid operations 4 times, at this moment, the op arc section reaches predetermined radius of curvature.
Step 5: shut down to detect the temperature of section bar 20, if continue bending operation during more than or equal to 600 ℃, if less than 600 ℃, melt down by step 2 and continue after being heated to 800 ℃ ± 20 ℃ crookedly again, temperature retention time reduces by half.
Step 6: the no section of bent section 20.As shown in Figure 6, the no section with section bar 20 is placed on two lower rolls 3 of bending machine 1 center-aligned of the mid point of no section and top roll 2; Control crank 4 promotion section bars 20 and move up, until section bar 20 contacts with top roll 2, by top roll 2 and two lower rolls 3 section bar 20 is positioned on the bending machine 1.Control that top roll 2 is rotated in a clockwise direction, two lower rolls 3 rotate in the counterclockwise direction, driving section bar 20 moves to its left end direction, the rotational line speed of described top roll 2 and two lower rolls 3 is 1200mm/min, simultaneously, the power that two lower rolls 3 is loaded 230KN makes its speed with 9.5mm/min top die mould material that moves up; When bottom right roller 3 contacts with the o point of section bar 20, change the direction of rotation of top roll 2 and two lower rolls 3, drive section bar 20 and move to its right-hand member direction, and the speed that the rotational line speed of top roll 2 and two lower rolls 3 of guaranteeing is constant and two lower rolls 3 move up is constant; When lower-left roller 3 contacts with the n point of section bar 20, change again the direction of rotation of top roll 2 and two lower rolls 3, driving section bar 20 moves to its left end direction, and the speed that the rotational line speed that guarantees top roll 2 and two lower rolls 3 is constant and two lower rolls 3 move up is constant, until top roll 2 contacts with the mid point of the no section of section bar 20.Two lower rolls 3 top die mould material 20 that always moves up all the time in the BENDING PROCESS.Repeat aforesaid operations 4 times, at this moment, the no arc section reaches predetermined radius of curvature.
Step 7: the pq section of bent section 20.Its operating process is with step 6, until the pq arc section after the bending reaches predetermined radius of curvature.View when Fig. 7 is section bar 20 crooked the end, at this moment, the mn section of section bar 20 and the alignment of qw section.The radius of curvature of described pq arc section radius of curvature=no arc section.
Fig. 8 shows the schematic diagram of the ring base 20 of the TB2 alloy flash welding thin-walled ring that adopts the method for the invention bending forming, this ring base 20 is " D " font, be comprised of two straight flanges 21, arc sections 23 and the excessive arc section 22 that connects described straight flange 21 and arc sections 23, relative position, end has opening 24 between two straight flanges.
Claims (7)
1. the shape bending blank-making method of a beta titanium alloy flash welding thin-walled ring is characterized in that, may further comprise the steps:
Beta titanium alloy section bar by the specification blanking is divided into five sections of mn, no, op, pq and qw, and the ratio of described each section is
Mn:
No:
Op:
Pq:
Qw=
1.0:
2.0 ~ 2.5:
7.0 ~ 8.0:
2.0 ~ 2.5:
1.0, more described section bar is heated to 800 ℃ ± 20 ℃;
Described section bar is put into bending machine, by top roll and two lower rolls of bending machine it is positioned, make the center of described section bar and the center-aligned of described top roll, described top roll and two lower rolls are positioned at the op section of described section bar;
Control that described top roll rotates in the counterclockwise direction, two lower rolls are rotated in a clockwise direction, driving section bar moves to its right-hand member direction, simultaneously the power of two lower rolls loading 158KN made its top die mould material that moves up, when the lower-left roller contacts with the o point of section bar, change the direction of rotation of top roll and two lower rolls, drive section bar and move to its left end direction; When the bottom right roller contacts with the p point of section bar, change again the direction of rotation of top roll and two lower rolls, drive section bar 20 and move to its right-hand member direction, until top roll contacts with the mid point of section bar op section; Two lower rolls top die mould material that always moves up all the time in the BENDING PROCESS; The rotational line speed of described upper and lower roll is 2400mm/min, and the speed that described two lower rolls move up is 7.5mm/min; Repeat aforesaid operations 4 times, at this moment, the op arc section reaches predetermined radius of curvature;
Shut down to detect the temperature of described section bar, if continue bending operation during more than or equal to 600 ℃, if less than 600 ℃, melt down continue again after being heated to 800 ℃ ± 20 ℃ crooked;
The no section of described section bar is positioned at the center-aligned that makes its mid point and top roll on the bending machine; Control that top roll is rotated in a clockwise direction, two lower rolls rotate in the counterclockwise direction, drive section bar and move to its left end direction, the power that simultaneously two lower rolls is loaded 230KN makes its top die mould material that moves up; When the bottom right roller contacts with the o point of section bar, change the direction of rotation of top roll and two lower rolls, drive section bar and move to its right-hand member direction; When the lower-left roller contacts with the n point of section bar, change again the direction of rotation of top roll and two lower rolls, drive section bar and move to its left end direction, until top roll contacts with the mid point of the no section of section bar; Two lower rolls top die mould material that always moves up all the time in the BENDING PROCESS; The rotational line speed of described upper and lower roll is 1200mm/min, and the speed that described two lower rolls move up is 9.5mm/min; Repeat aforesaid operations 4 times, at this moment, the no arc section reaches predetermined radius of curvature;
By the crooked pq section of the step of above-mentioned crooked no section, until the pq arc section after the bending reaches predetermined radius of curvature, the mn section of described section bar and the alignment of qw section.
2. the shape bending blank-making method of beta titanium alloy flash welding thin-walled ring according to claim 1 is characterized in that: the radius of curvature of described each crooked arc section is determined by following formula:
In the formula:
R---the radius of curvature (mm) of crooked rear corresponding circle segmental arc;
Centre distance (mm) between a---two lower rolls;
δ---the distance (mm) that lower roll rises during crooked corresponding circle segmental arc;
The radius of r---lower roll (mm);
The thickness of d---section bar (mm).
3. the shape bending blank-making method of beta titanium alloy flash welding thin-walled ring according to claim 1 is characterized in that: the matching relationship of the speed that described lower roll moves up and the rotary speed of described upper and lower roll is determined by following formula:
In the formula:
V
2---the speed (mm/min) that lower roll moves up during crooked corresponding circle segmental arc;
V
1---the rotary speed of top roll or lower roll (mm/min) during crooked corresponding segmental arc;
R---the radius of curvature (mm) of crooked rear corresponding circle segmental arc;
δ---the distance (mm) that lower roll rises during crooked corresponding circle segmental arc;
The number of times (inferior) of n---corresponding circle segmental arc repeated flex.
4. the shape bending blank-making method of beta titanium alloy flash welding thin-walled ring according to claim 1 is characterized in that: described bending machine loads to can the move up minimum force of top die mould material of lower roll to be determined by following formula:
In the formula:
F---bending machine loads to can the move up minimum force (N) of top die mould material of lower roll;
The rigidity of EJ---bar.Wherein, E is elastic modelling quantity (GPa), and J is the cross section moments of inertia (cm of bar
4);
Centre distance (mm) between a---two lower rolls;
The distance that δ---lower roll moves up (mm).
5. the shape bending blank-making method of each described beta titanium alloy flash welding thin-walled ring in 4 according to claim 1, it is characterized in that: described beta titanium alloy is TB2.
6. the shape bending blank-making method of each described beta titanium alloy flash welding thin-walled ring in 4 according to claim 1, it is characterized in that: the axial cross section size maximum of described ring is 65mm * 30mm.
7. the shape bending blank-making method of each described beta titanium alloy flash welding thin-walled ring in 4 according to claim 1, it is characterized in that: adopt the ring base of the flash welding thin-walled ring of described method bending forming to be " D " font, be comprised of two straight flanges, arc sections and the transition circle segmental arc that connects described straight flange and arc sections, relative position, end has opening between two straight flanges.
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|---|---|---|---|
| CN201210480495.3A CN102941260B (en) | 2012-11-23 | 2012-11-23 | Bending blank manufacturing method for beta-phase titanium alloy flash welding thin-wall ring profiles |
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|---|---|---|---|
| CN201210480495.3A CN102941260B (en) | 2012-11-23 | 2012-11-23 | Bending blank manufacturing method for beta-phase titanium alloy flash welding thin-wall ring profiles |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3105079A1 (en) * | 1981-02-12 | 1982-08-19 | Kotflügelfabrik H. Köver GmbH & Co KG, 2150 Buxtehude | Bending machine for roll-bending sheet-metal blanks and a method for the production of mudguards |
| JPS58173026A (en) * | 1982-04-02 | 1983-10-11 | Toshiba Corp | Bending method |
| FR2517226B1 (en) * | 1981-11-30 | 1985-02-15 | Floquet Monopole | |
| JPH06190453A (en) * | 1992-12-24 | 1994-07-12 | Miyake Kogyo Kk | Method and device for bending metallic material by bending roll |
| CN1340390A (en) * | 2000-08-29 | 2002-03-20 | 株式会社三晴 | Bending-processed product and its bending processing method and its bending processing device used |
| CN200981082Y (en) * | 2006-03-28 | 2007-11-28 | 多林股份公司 | Profile bending machine |
-
2012
- 2012-11-23 CN CN201210480495.3A patent/CN102941260B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3105079A1 (en) * | 1981-02-12 | 1982-08-19 | Kotflügelfabrik H. Köver GmbH & Co KG, 2150 Buxtehude | Bending machine for roll-bending sheet-metal blanks and a method for the production of mudguards |
| FR2517226B1 (en) * | 1981-11-30 | 1985-02-15 | Floquet Monopole | |
| JPS58173026A (en) * | 1982-04-02 | 1983-10-11 | Toshiba Corp | Bending method |
| JPH06190453A (en) * | 1992-12-24 | 1994-07-12 | Miyake Kogyo Kk | Method and device for bending metallic material by bending roll |
| CN1340390A (en) * | 2000-08-29 | 2002-03-20 | 株式会社三晴 | Bending-processed product and its bending processing method and its bending processing device used |
| CN200981082Y (en) * | 2006-03-28 | 2007-11-28 | 多林股份公司 | Profile bending machine |
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|---|---|
| CN102941260B (en) | 2014-12-17 |
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