CN102941262B - Method for section bar bending blank manufacturing of ball bearing steel flash welding thin-wall annular member - Google Patents
Method for section bar bending blank manufacturing of ball bearing steel flash welding thin-wall annular member Download PDFInfo
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- CN102941262B CN102941262B CN201210480650.1A CN201210480650A CN102941262B CN 102941262 B CN102941262 B CN 102941262B CN 201210480650 A CN201210480650 A CN 201210480650A CN 102941262 B CN102941262 B CN 102941262B
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Abstract
The invention discloses a method for section bar bending blank manufacturing of a ball bearing steel flash welding thin-wall annular member. The method includes: dividing the ball bearing steel section bar discharged into an mn section, an no section, an op section, a pq section and a qw section, heating the five sections to the temperature of 73020DEG C and then filling the five sections into a bending machine for positioning; firstly bending the op section, wherein the rotating linear speed of an upper roller and two lower rollers of the bending machine is 240mm/min, and the upward moving speed of the two lower rollers is 6.0mm/min; repeating bending, and additionally enabling the op arc section to reach the preset radius of curvature; then bending the no section and the pq section, wherein the rotating linear speed of the upper roller and the two lower rollers is 1200mm/min, and the upward moving speed of the two lower rollers is 12.7mm/min; and repeating bending, enabling the no arc section and the pq arc section to reach the preset radius of curvature. The section bar is formed by using the method, two straight edges of the annular blank and the arc part are connected through a transition arc section, and bent angles is removed and creasing is avoided at the time of correcting the shape.
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 bearing steel flash welding thin-walled ring.
Background technology
Along with the increase of industry to ring demand such as Aeronautics and Astronautics, boats and ships, gas turbine, wind energy, nuclear energy and bearings, adopt the ring of traditional milling method shaping because machine-finish allowance is large, 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 Precision Forming Technology future development.The technology of preparing of flash of light weld-ring base is one of key technology of producing flash welding ring.
Preparation for flash of light weld-ring base in prior art mainly adopts following methods: first section bar is packed into and on bending machine, bend to approximate circle, and respectively stay one section of straight flange at section bar two ends position; On the type machine of school, the straight portion of section bar and circular arc portion are 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.The flash of light weld-ring base that adopts said method to prepare, can produce knuckle at the ring circular arc portion of base and the junction of two ends straight portion, on the surface of ring base, easily produces impression; Described ring base is after flash welding is configured as ring, need to carry out bulging school circle processes, during bulging, knuckle place easily produces stress and concentrates and to be caused ring to be scrapped by spalling, school bowlder, need to spend a large amount of man-hours and energy consumption repairs knuckle, and can not be completely eliminated, after the circle of school, the whole ovality of ring is larger; Because the allowance of flash welding ring is less, the large and surface of ring ovality 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 is to provide the crooked base that a kind of method of on bending machine, section bar being carried out to segmentation bending realizes bearing steel flash welding thin-walled ring section bar, knuckle and impression that the method produces in the time of eliminating crooked bearing steel profile, be 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 bearing steel flash welding thin-walled ring of the present invention, its technical scheme comprises the following steps:
Bearing steel section bar by 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 730 ℃ ± 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, drive section bar to move to its right-hand member direction, the power of two lower rolls loading 286KN is made to its top die mould material that moves up simultaneously, when 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 to move to its left end direction; When 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 to 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 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 10.0mm/min; Repeat aforesaid operations 3 times, now, op arc section reaches predetermined radius of curvature;
Shut down to detect the temperature of described section bar, if continue bending operation while being more than or equal to 530 ℃, if be less than 530 ℃, melt down after being heated to 730 ℃ ± 20 ℃ and continue again crooked no section;
The no section of described section bar is positioned to the center-aligned that makes its mid point and top roll on bending machine; Control that top roll is rotated in a clockwise direction, two lower rolls rotate in the counterclockwise direction, drive section bar to move to its left end direction, the power that simultaneously two lower rolls is loaded to 418KN makes its top die mould material that moves up; When 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 to move to its right-hand member direction; When 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 to 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 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 12.7mm/min; Repeat aforesaid operations 3 times, now, 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 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 formula:
R---the radius of curvature (mm) of crooked rear corresponding circle segmental arc;
A---the centre distance (mm) between two lower rolls;
δ---the distance (mm) that during crooked corresponding circle segmental arc, lower roll rises;
The radius of r---lower roll (mm);
The thickness of d---section bar (mm).
Preferably, the speed that described lower roll moves up and the rotational line speed of described upper and lower roll are determined by following formula:
In formula:
V
2---the speed (mm/min) that during crooked corresponding circle segmental arc, lower roll moves up;
V
1---the rotational line speed (mm/min) of top roll or lower roll during crooked corresponding circle segmental arc;
R---the radius of curvature (mm) of crooked rear corresponding circle segmental arc;
δ---the distance (mm) that during crooked corresponding circle segmental arc, lower roll rises;
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 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), the cross section moments of inertia (cm that J is bar
4);
A---the centre distance (mm) between two lower rolls;
The distance that δ---lower roll moves up (mm).
Preferably, described bearing steel is G20Cr2Ni4.
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, two straight flanges, arc sections and the excessive arc section that connects described straight flange and arc sections, consist of, between two straight flanges, relative position, end has opening.
Compared with prior art, beneficial effect of the present invention is as follows:
The shape bending blank-making method of bearing steel flash welding thin-walled ring of the present invention is divided into five sections of mn, no, op, pq and qw described section bar in BENDING PROCESS, 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, make the crooked radius of curvature of op section afterwards be 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 after crooked, two straight flanges of ring base are connected by transition circle segmental arc with arc sections, 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 base process be easy to carry out, and avoided flash welding ring knuckle place in the sired results skill of follow-up bulging school of welding forming easily to produce that stress is concentrated and problem that spalling causes ring to be scrapped; Meanwhile, also make bulging school circle process be 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 meets
the rotational line speed of the speed that lower roll moves up and top roll, lower roll meets
time, can make smooth rounding off and bending forming between each crooked arc section.
Accompanying drawing explanation
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 bearing steel section bar.
Fig. 4 is the installation schematic diagram of bearing steel section bar.
Fig. 5 is the BENDING PROCESS schematic diagram of bearing steel section bar op section.
Fig. 6 is the BENDING PROCESS schematic diagram of bearing steel section bar no section.
Fig. 7 is the view after bearing steel shape bending finishes.
Fig. 8 is the ring base schematic diagram that adopts the bearing steel flash welding thin-walled ring that the present invention produces.
The specific embodiment
The shape bending blank-making method of implementing bearing steel 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 bearing steel 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, the junction at two straight flanges 11 respectively and between arc sections 13 forms 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 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 bearing steel that China's material trademark of take is below G20Cr2Ni4 shape bending blank-making method of bearing steel 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: C content 0.17%～0.23%, containing Mn amount 0.30%～0.60%, si content 0.15%～0.40%, containing S amount≤0.030%, P content≤0.030%, containing Cr amount 1.25%～1.75%, ni content 3.25%～3.75%, containing Cu amount≤0.25, surplus, be Fe.
The processing step of concrete crooked base is as follows:
Step 1: blanking.As shown in Figure 3, cross section, be that rectangular G20Cr2Ni4 alloy material is cutting into section bar 20 by specification, the length of this section bar 20 is definite according to the diameter dimension of welding ring, and its maximum secting area is 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 and the acquisition that are greater than no or pq section of the radius of curvature of op section be the ring base of " D " font, 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, during segmentation, can on section bar 20, take the methods such as marking that each section distinguished.
Step 2: heating.Section bar 20 is heated to 730 ℃ ± 20 ℃, and temperature retention time is 3min/10mm～8min/10mm, and insulation is less than 2h total time.
Step 3: installation.As shown in Figure 4, section bar 20 is put into bending machine 1, 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 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, drive section bar 20 to move to its right-hand member direction, described upper and lower roll 2 and 3 rotational line speed are 2400mm/min, meanwhile, the power that two lower rolls 3 is loaded to 286KN makes its speed with 10.0mm/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 to 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, drive section bar 20 to move 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 BENDING PROCESS.Repeat aforesaid operations 3 times, now, op arc section reaches predetermined radius of curvature.
Step 5: shut down to detect the temperature of section bar 20, if continue bending operation while being more than or equal to 530 ℃, if be less than 530 ℃, then melt down after being heated to 730 ℃ ± 20 ℃ and continue crooked no section again by step 2, temperature retention time reduces by half.
Step 6: the no section of bent section 20.As shown in Figure 6, the no section of section bar 20 is placed on two lower rolls 3 of bending machine 1 to the 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 bending machine 1.Control that top roll 2 is rotated in a clockwise direction, two lower rolls 3 rotate in the counterclockwise direction, drive section bar 20 to move to its left end direction, the rotational line speed of described top roll 2 and two lower rolls 3 is 1200mm/min, meanwhile, the power that two lower rolls 3 is loaded to 418KN makes its speed with 12.7mm/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 to 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, drive section bar 20 to move 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 BENDING PROCESS.Repeat aforesaid operations 3 times, now, 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 bending reaches predetermined radius of curvature.View when Fig. 7 is section bar 20 crooked end, now, 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 G20Cr2Ni4 alloy flash welding thin-walled ring that adopts the method for the invention bending forming, this ring base 20 is " D " font, two straight flanges 21, arc sections 23 and the excessive arc section 22 that connects described straight flange 21 and arc sections 23, consist of, between two straight flanges, relative position, end has opening 24.
Claims (7)
1. a shape bending blank-making method for bearing steel flash welding thin-walled ring, is characterized in that, comprises the following steps:
Bearing steel section bar by 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 730 ℃ ± 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, drive section bar to move to its right-hand member direction, the power of two lower rolls loading 286KN is made to its top die mould material that moves up simultaneously, when 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 to move to its left end direction; When 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 to 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 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 10.0mm/min; Repeat aforesaid operations 3 times, now, op arc section reaches predetermined radius of curvature;
Shut down to detect the temperature of described section bar, if continue bending operation while being more than or equal to 530 ℃, if be less than 530 ℃, melt down after being heated to 730 ℃ ± 20 ℃ and continue again crooked no section;
The no section of described section bar is positioned to the center-aligned that makes its mid point and top roll on bending machine; Control that top roll is rotated in a clockwise direction, two lower rolls rotate in the counterclockwise direction, drive section bar to move to its left end direction, the power that simultaneously two lower rolls is loaded to 418KN makes its top die mould material that moves up; When 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 to move to its right-hand member direction; When 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 to 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 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 12.7mm/min; Repeat aforesaid operations 3 times, now, 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 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 bearing steel 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 formula:
R---the radius of curvature (mm) of crooked rear corresponding circle segmental arc;
A---the centre distance (mm) between two lower rolls;
δ---the distance (mm) that during crooked corresponding circle segmental arc, lower roll rises;
The radius of r---lower roll (mm);
The thickness of d---section bar (mm).
3. the shape bending blank-making method of bearing steel flash welding thin-walled ring according to claim 1, is characterized in that: the matching relationship of the rotational line speed of the speed that described lower roll moves up and described upper and lower roll is determined by following formula:
In formula:
V
2---the speed (mm/min) that during crooked corresponding circle segmental arc, lower roll moves up;
V
1---the rotational line speed (mm/min) of top roll or lower roll during crooked corresponding circle segmental arc;
R---the radius of curvature (mm) of crooked rear corresponding circle segmental arc;
δ---the distance (mm) that during crooked corresponding circle segmental arc, lower roll rises;
The number of times (inferior) of n---corresponding circle segmental arc repeated flex.
4. the shape bending blank-making method of bearing steel 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 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), the cross section moments of inertia (cm that J is bar
4);
A---the centre distance (mm) between two lower rolls;
The distance that δ---lower roll moves up (mm).
5. according to the shape bending blank-making method of the bearing steel flash welding thin-walled ring described in any one in claim 1 to 4, it is characterized in that: described bearing steel is G20Cr2Ni4.
6. according to the shape bending blank-making method of the bearing steel flash welding thin-walled ring described in any one in claim 1 to 4, it is characterized in that: the axial cross section size maximum of described ring is 65mm * 30mm.
7. according to the shape bending blank-making method of the bearing steel flash welding thin-walled ring described in any one in claim 1 to 4, 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, two straight flanges, arc sections and the transition circle segmental arc that connects described straight flange and arc sections, consist of, between two straight flanges, relative position, end has opening.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210480650.1A CN102941262B (en) | 2012-11-23 | 2012-11-23 | Method for section bar bending blank manufacturing of ball bearing steel flash welding thin-wall annular member |
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|---|---|---|---|
| CN201210480650.1A CN102941262B (en) | 2012-11-23 | 2012-11-23 | Method for section bar bending blank manufacturing of ball bearing steel flash welding thin-wall annular member |
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|---|---|---|---|---|
| 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 |
| 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 |
| EP1342514A2 (en) * | 2002-03-06 | 2003-09-10 | Rasi Maschinenbau Und -Handels Gmbh | Device for detecting a ring bending angle, and method of regulating a bending machine |
| EP2248611A1 (en) * | 2009-05-06 | 2010-11-10 | CML International S.P.A. | A machine for continuously bending an elongated workpiece at predetermined radii |
| CN102445921A (en) * | 2010-09-30 | 2012-05-09 | 成都飞机工业（集团）有限责任公司 | Method for designing loading track for multi-pass roll bending of wall plate and generating numerical control code |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITRM20080078A1 (en) * | 2008-02-12 | 2009-08-13 | Cml Intarnational S P A | METHOD OF VERIFICATION AND COMMAND TO CURVE IN AN CONTINUOUS WAY A PIECE EXTENDED ACCORDING TO VARIABLE CURCATORS SPOKES AND MACHINE SO COMMANDED |
-
2012
- 2012-11-23 CN CN201210480650.1A patent/CN102941262B/en active Active
Patent Citations (5)
| 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 |
| 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 |
| EP1342514A2 (en) * | 2002-03-06 | 2003-09-10 | Rasi Maschinenbau Und -Handels Gmbh | Device for detecting a ring bending angle, and method of regulating a bending machine |
| EP2248611A1 (en) * | 2009-05-06 | 2010-11-10 | CML International S.P.A. | A machine for continuously bending an elongated workpiece at predetermined radii |
| CN102445921A (en) * | 2010-09-30 | 2012-05-09 | 成都飞机工业（集团）有限责任公司 | Method for designing loading track for multi-pass roll bending of wall plate and generating numerical control code |
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