CN103934333B - A kind of bending process of linear pattern heating furnace tube - Google Patents

A kind of bending process of linear pattern heating furnace tube Download PDF

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Publication number
CN103934333B
CN103934333B CN201410147223.0A CN201410147223A CN103934333B CN 103934333 B CN103934333 B CN 103934333B CN 201410147223 A CN201410147223 A CN 201410147223A CN 103934333 B CN103934333 B CN 103934333B
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China
Prior art keywords
fixture
bending
dipper crowding
crowding gear
boiler tube
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CN201410147223.0A
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CN103934333A (en
Inventor
楼碧云
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JIANGSU BINXIN STEEL GROUP CO., LTD.
Original Assignee
楼碧云
方小刚
方新刚
吴刚
方流生
汪贤女
吴扬华
舒泳军
汪涛
夏雨
吴杨
王康
张关池
吴美俊
钟潘霄
吴延飞
张建锋
刘芝英
王燕红
张延�
张关莲
刘美福
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Application filed by 楼碧云, 方小刚, 方新刚, 吴刚, 方流生, 汪贤女, 吴扬华, 舒泳军, 汪涛, 夏雨, 吴杨, 王康, 张关池, 吴美俊, 钟潘霄, 吴延飞, 张建锋, 刘芝英, 王燕红, 张延�, 张关莲, 刘美福 filed Critical 楼碧云
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Abstract

A kind of bending machining technique of linear pattern furnace tubing, it uses a kind of crooking of the tubes equipment, described crooking of the tubes equipment comprises left frame (13) and dipper crowding gear (10), dipper crowding gear (10) is in left frame (13) right, the rear portion, right side of described left frame (13) is fixedly connected with dovetail guide (15), dovetail guide (15) horizontal-extending in the lateral direction, the left end of dovetail guide (15) is fixedly connected with described left frame (13), dovetail groove in the right-hand member of dovetail guide (15) and the rear portion of dipper crowding gear (10) is slidably connected, the front portion of described left frame (13) is provided with the through hole passed for boiler tube, described dovetail guide (15) slides successively from left to right between described left frame (13) and dipper crowding gear (10) and is provided with three bending hydraulic means (9).

Description

A kind of bending process of linear pattern heating furnace tube
Technical field
The application relates to the making of heating furnace tube, is specially a kind of linear heating furnace tube bending process.
Background technology
Heating furnace has a wide range of applications in the industry, such as heating steel billet, heat treatment of workpieces etc.In order to increase the heating uniformity of heating furnace, heating furnace tube is often in a bent form.
In the prior art, in order to ensure the requirement of concrete heating furnace shape and meet the requirement respectively of concrete heating heat, usually need to carry out the bending of concrete shape to the shape of boiler tube.Bending for heating furnace tube, often adopts stamping forming mode in the prior art.This molding mode efficiently can realize bending machining rapidly, and machining accuracy is high, and cost is lower, has extensive use in the prior art.But, this mode of heating easily produces significantly a large amount of inhomogeneous deformations on the longitudinal direction of heating furnace tube, the cross-sectional area of heating furnace tube is caused to have larger variation on the longitudinal direction of boiler tube, this makes heating uniformity in heating process be difficult to control, and, easily in the process used, produce uneven stress to concentrate, thus cause the stability in use of heating furnace, security greatly reduces, and shortens the service life of heating furnace.
Also have in the prior art and use bending to roll the scheme bent workpiece.But, this scheme often adopts curved bending one by one to workpiece, because the longitudinal size of workpiece is comparatively large, in the complete rotation process of workpiece, this processing often needs larger processing space, and, because process is adopt mode curved one by one, process is longer, and working (machining) efficiency is lower, cause processing cost to rise thus, and be difficult to the form accuracy ensureing processing.
Summary of the invention
A kind of heating furnace tube bending process of the present invention, it is intended to solve the defects such as machining deformation in prior art is uneven and process is long, form accuracy is low, and provides a kind of bending process with the heating furnace tube of concrete shape.
The technical solution used in the present invention is as follows:
The linear pattern crooking of the tubes technique of stress relief annealing is carried out with chucking position sensor, it uses a kind of crooking of the tubes equipment, described crooking of the tubes equipment comprises left frame and dipper crowding gear, dipper crowding gear is in left frame right, the rear portion, right side of described left frame is fixedly connected with dovetail guide, dovetail guide is horizontal-extending in the lateral direction, the left end of dovetail guide is fixedly connected with described left frame, dovetail groove in the right-hand member of dovetail guide and the rear portion of dipper crowding gear is slidably connected, and the front portion of described left frame is provided with the through hole passed for boiler tube; Described dovetail guide slides successively from left to right between described left frame and dipper crowding gear and is provided with three bending hydraulic means; The front portion, left side of dipper crowding gear is fixedly installed the first fixture, the right front of left frame is fixedly installed the second fixture, fromer rail is provided with between described left frame and dipper crowding gear, described fromer rail straight line between the second fixture and the first fixture extends, and when dipper crowding gear slides along described dovetail guide, the first fixture can slide along fromer rail towards the second fixture; Described fromer rail is also provided with the 3rd fixture and the 4th fixture slidably between the second fixture and the first fixture, four described fixtures include clip base, rear fixture block and front fixture block, the described rear fixture block of each described fixture and front fixture block are all relatively arranged along the fore-and-aft direction in the plane of bending when described boiler tube generation plain bending, and can realize contact gripping and be separated the action of unclamping in clip base; Wherein, described rear fixture block is all positioned at described fromer rail rear, and is rectangular shape, described front fixture block, is all positioned at described fromer rail front, and is cylindrical shape; The longitudinal axis of described rectangular shape and cylindrical shape is all perpendicular to plane of bending during described boiler tube generation plain bending.
Wherein, the right flank of the rear fixture block of described second fixture is provided with the right extension limited block extended to the right, the left surface of the rear fixture block of described first fixture is provided with the left extension limited block extended to the left, the left and right side of the rear fixture block of the 3rd fixture and the 4th fixture is provided with respectively the left extension limited block extended to the left and the right extension limited block extended to the right.
Each in described three bending hydraulic means includes driving hydraulic cylinder, and described driving hydraulic cylinder is arranged relative to the longitudinal axis orthogonal of dovetail guide, and can slide on dovetail guide; The hydraulic stem end of described driving hydraulic cylinder is hinged with bending rolling, and drives hydraulic cylinder can roll applying bend pipe thrust forward along the direction vertical with dovetail guide driving to bending; Each in described three bending hydraulic means all also comprises hoofing part mechanism, slides into diverse location in order to drive corresponding bending hydraulic means respectively along dovetail guide.
The right side of described dipper crowding gear is provided with support bar telescoping mechanism, support bar telescoping mechanism is arranged on the front of described dovetail guide, support bar telescoping mechanism has retractility support bar, retractility support bar can be used in extending in described boiler tube through the left side leaving dipper crowding gear from the right side of dipper crowding gear, thus play the effect supporting boiler tube and prevent boiler tube generation undesirably bending, and can move back and forth in the lateral direction under the driving of support bar telescoping mechanism.
Described crooking of the tubes technique comprises the steps:
A., linear pattern boiler tube is provided;
B. described linear pattern boiler tube penetrated a through hole on described left frame and advance to the right, until the length thereof that described linear pattern boiler tube will carry out bending machining stretches out in described left frame;
C. the left end of described linear pattern boiler tube clamps by described second fixture;
D. dipper crowding gear motion, to make the right-hand member of the first clamp linear pattern boiler tube;
E. the 3rd fixture and the 4th fixture clamp linear pattern boiler tube between the second fixture and the first fixture, and make the second fixture, the 3rd fixture, the 4th fixture and the first fixture the forearm of linear pattern boiler tube is separated into three equal length sections of length; Described fromer rail is fixedly installed left chucking position detecting sensor and right chucking position detecting sensor, wherein, the left chucking position detecting sensor of described fromer rail when the position of the 3rd fixture with it to sending signal time corresponding, the right chucking position detecting sensor of described fromer rail when the position of the 4th fixture with it to sending signal time corresponding; Described chucking position detecting sensor on fromer rail is positioned to contribute to realizing the corresponding processing sections of boiler tube to be divided into three equal length sections of described length on fromer rail, described location aware sensor is hall effect sensor and magnetic effect sensor, or one is hall effect sensor, another is magnetic effect sensor;
F. each in described three bending hydraulic means makes it bendingly roll the mid point contacting corresponding each length section in described three length sections respectively;
G. retractility support bar stretches in the pipe of linear pattern boiler tube by the support bar telescoping mechanism of dipper crowding gear, and first length section from left to right stayed in described three length sections is not supported, from left to right second and the 3rd length section supported;
H. bending outwards described first length section of top pressure that begin of getting away of the bending hydraulic means in left side, thus it is bending to make it that linear occur, dipper crowding gear synchronously follows pushing along with bending carrying out, meanwhile, and the 3rd fixture, the also synchronously accompany movement of the 4th fixture; In the process of top pressure, the bending hydraulic means in left side to left movement, thus makes it bending roll the position keeping corresponding to described first length section mid point under the driving of its hoofing part mechanism; When the right extension limited block of the second fixture contacts with the left extension limited block of the 3rd fixture, bending the rolling of the bending hydraulic means in described left side stops top pressure, and dipper crowding gear stops continuing urged forward;
I. retractility support bar bounces back by the support bar telescoping mechanism of dipper crowding gear, thus first length section from left to right making to stay in described three length sections and from left to right second length section are not all supported, and the 3rd length section is supported from left to right;
J. the bending hydraulic means in the middle of starts second length section from left to right described in the pressure of top, until the right extension limited block of the 3rd fixture contacts with the left extension limited block of the 4th fixture;
K. dipper crowding gear makes described support bar bounce back completely, is not all supported to make three length sections;
L. the bending hydraulic means on right side starts the 3rd length section from left to right described in the pressure of top, until the right extension limited block of the 4th fixture contacts with the left extension limited block of the first fixture;
M. each fixture unclamps, and takes the heating furnace tube that bending machining is complete away.
N. heating furnace tube complete for bending machining is put into destressing heat-treatment furnace and carry out stress relief annealing, the process conditions of annealing are: holding temperature degree Celsius, temperature retention time hour.
Due in the present invention, each fixture have employed extension limited block, thus after limited block is contacted, a locking can be carried out to the boiler tube after shaping, under the effect of follow-up elaboration power, can not the curved shape after precise forming be impacted, and to have employed be cuboid while be columniform fixture, while making to ensure that enough clamping forces, level and smooth flexural deformation can be formed to the boiler tube be shaped again, whole process, while in longitudinal direction feeding, while utilize bending rolling work to carry out bending, therefore, to which obviate in prior art on the longitudinal direction of boiler tube process the problem that bending position produces larger linear deformation, and, in process, it adopts unique form processing, feeding on one side, bending rolling is carried out action and moves on parallel longitudinal direction direction in vertical longitudinal direction, thus keep bending and roll the relative position relation with institute's crooked position, and boiler tube is longitudinally sent under the moving integrally of other clamping devices, therefore, ensure that boiler tube entirety keeps longitudinal direction and bent one by one, whole BENDING PROCESS is continuous, without the need to repeating, clamping and dismounting are carried out to boiler tube, make whole process processing space little, process is short and ensure that the form accuracy of processing.And multiple fixture can slide in process, ensure that the locking all the time boiler tube in process to clamping position.
Accompanying drawing explanation
Fig. 1 is the schematic top plan view of bending apparatus of the present invention.
Fig. 2 is the schematic top plan view of bending apparatus after completing the crooking of the tubes in Fig. 1 of the present invention.
Fig. 3 is the schematic top plan view of the boiler tube shape after having bent.
Detailed description of the invention
Below in conjunction with accompanying drawing 1-3, the present invention is described in detail.
The linear pattern crooking of the tubes technique of stress relief annealing is carried out with chucking position sensor, it uses a kind of crooking of the tubes equipment, described crooking of the tubes equipment comprises left frame 13 and dipper crowding gear 10, dipper crowding gear 10 is in left frame 13 right, the rear portion, right side of described left frame 13 is fixedly connected with dovetail guide 15, dovetail guide 15 horizontal-extending in the lateral direction, the left end of dovetail guide 15 is fixedly connected with described left frame 13, dovetail groove in the right-hand member of dovetail guide 15 and the rear portion of dipper crowding gear 10 is slidably connected, the front portion of described left frame 13 is provided with the through hole passed for boiler tube, described dovetail guide 15 slides successively from left to right between described left frame 13 and dipper crowding gear 10 and is provided with three bending hydraulic means 9, the front portion, left side of dipper crowding gear 10 is fixedly installed the first fixture 1, the right front of left frame 13 is fixedly installed the second fixture 4, fromer rail is provided with between described left frame 13 and dipper crowding gear 10, described fromer rail straight line between the second fixture 4 and the first fixture 1 extends, and when dipper crowding gear 10 slides along described dovetail guide 15, the first fixture 1 can slide along fromer rail towards the second fixture 4, described fromer rail is also provided with the 3rd fixture 3 and the 4th fixture 2 slidably between the second fixture 4 and the first fixture 1, four described fixtures 1,2,3,4 include clip base, rear fixture block 41 and front fixture block 42, the described rear fixture block 41 of each described fixture and front fixture block 42 are all relatively arranged along the fore-and-aft direction in the plane of bending when described boiler tube generation plain bending, and can realize contact gripping and be separated the action of unclamping in clip base, wherein, described rear fixture block 41 is all positioned at described fromer rail rear, and is rectangular shape, and described front fixture block 42 is all positioned at described fromer rail front, and is cylindrical shape, the longitudinal axis of described rectangular shape and cylindrical shape is all perpendicular to plane of bending during described boiler tube generation plain bending.
Wherein, the right flank of the rear fixture block of described second fixture 4 is provided with the right extension limited block 43 extended to the right, the left and right side left surface of the rear fixture block of described first fixture 1 being provided with the rear fixture block of left extension limited block the 14, three fixture 3 and the 4th fixture 2 extended to the left is provided with the left extension limited block extended to the left and the right extension limited block extended to the right respectively.
Each in described three bending hydraulic means 9 includes driving hydraulic cylinder, and described driving hydraulic cylinder is arranged relative to the longitudinal axis orthogonal of dovetail guide 15, and can slide on dovetail guide 15; The hydraulic stem end of described driving hydraulic cylinder is hinged with and bendingly rolls 91, and drives hydraulic cylinder can drive along the direction vertical with dovetail guide 15 to roll 91 applyings bend pipe thrust forward to bending; Each in described three bending hydraulic means 9 all also comprises hoofing part mechanism, slides into diverse location in order to drive corresponding bending hydraulic means 9 respectively along dovetail guide 15.
The right side of described dipper crowding gear 10 is provided with support bar telescoping mechanism 12, support bar telescoping mechanism 12 is arranged on the front of described dovetail guide 15, support bar telescoping mechanism 12 has retractility support bar 120, retractility support bar 120 can be used in extending in described boiler tube through the left side leaving dipper crowding gear 10 from the right side of dipper crowding gear 10, thus play the effect supporting boiler tube and prevent boiler tube generation undesirably bending, and can move back and forth in the lateral direction under the driving of support bar telescoping mechanism 12.
Described crooking of the tubes technique comprises the steps:
A., linear pattern boiler tube is provided;
B. described linear pattern boiler tube penetrated a through hole on described left frame 13 and advance to the right, until the length thereof that described linear pattern boiler tube will carry out bending machining stretches out in described left frame 13;
C. the left end of described linear pattern boiler tube clamps by described second fixture 4;
D. dipper crowding gear 10 moves, with the right-hand member making the first fixture 1 clamp linear pattern boiler tube;
E. the 3rd fixture 3 and the 4th fixture 2 clamp linear pattern boiler tube between the second fixture 4 and the first fixture 1, and make the second fixture 4, the 3rd fixture 3, the 4th fixture 2 and the first fixture 1 forearm of linear pattern boiler tube is separated into three equal length sections of length; Described fromer rail is fixedly installed left chucking position detecting sensor and right chucking position detecting sensor, wherein, the left chucking position detecting sensor of described fromer rail when the position of the 3rd fixture 3 with it to sending signal time corresponding, the right chucking position detecting sensor of described fromer rail when the position of the 4th fixture 2 with it to sending signal time corresponding; Described chucking position detecting sensor on fromer rail is positioned to contribute to realizing the corresponding processing sections of boiler tube to be divided into three equal length sections of described length on fromer rail, described location aware sensor is hall effect sensor and magnetic effect sensor, or one is hall effect sensor, another is magnetic effect sensor;
F. each in described three bending hydraulic means 9 makes it bendingly roll the mid point that 91 contact corresponding each length section in described three length sections respectively;
G. retractility support bar 120 stretches in the pipe of linear pattern boiler tube by the support bar telescoping mechanism 12 of dipper crowding gear 10, and first length section from left to right stayed in described three length sections is not supported, from left to right second and the 3rd length section supported;
H. bending outwards described first length section of top pressure that begin of getting away of the bending hydraulic means 9 in left side, thus it is bending to make it that linear occur, dipper crowding gear 10 synchronously follows pushing along with bending carrying out, meanwhile, and the 3rd fixture 3, the also synchronously accompany movement of the 4th fixture 2; In the process of top pressure, the bending hydraulic means 9 in left side to left movement, thus makes it bending roll the position keeping corresponding to described first length section mid point under the driving of its hoofing part mechanism; When the right extension limited block 43 of the second fixture 4 contacts with the left extension limited block of the 3rd fixture 3, bending the rolling of the bending hydraulic means 9 in described left side stops top pressure, and dipper crowding gear 10 stops continuing urged forward;
I. retractility support bar 120 bounces back by the support bar telescoping mechanism 12 of dipper crowding gear 10, thus first length section from left to right making to stay in described three length sections and from left to right second length section are not all supported, and the 3rd length section is supported from left to right;
J. the bending hydraulic means 9 in the middle of starts second length section from left to right described in the pressure of top, until the right extension limited block of the 3rd fixture 3 contacts with the left extension limited block of the 4th fixture 2;
K. dipper crowding gear 10 makes described support bar 120 bounce back completely, is not all supported to make three length sections;
L. the bending hydraulic means 9 on right side starts the 3rd length section from left to right described in the pressure of top, until the right extension limited block of the 4th fixture 2 contacts with the left extension limited block of the first fixture 1;
M. each fixture unclamps, and takes the heating furnace tube that bending machining is complete away.
N. heating furnace tube complete for bending machining is put into destressing heat-treatment furnace and carry out stress relief annealing, the process conditions of annealing are: holding temperature 300 degrees Celsius, temperature retention time 3 hours.

Claims (1)

1. carry out the linear pattern crooking of the tubes technique of stress relief annealing with chucking position sensor, it uses a kind of crooking of the tubes equipment, described crooking of the tubes equipment comprises left frame (13) and dipper crowding gear (10), dipper crowding gear (10) is in left frame (13) right, the rear portion, right side of described left frame (13) is fixedly connected with dovetail guide (15), dovetail guide (15) horizontal-extending in the lateral direction, the left end of dovetail guide (15) is fixedly connected with described left frame (13), dovetail groove in the right-hand member of dovetail guide (15) and the rear portion of dipper crowding gear (10) is slidably connected, the front portion of described left frame (13) is provided with the through hole passed for boiler tube, described dovetail guide (15) slides successively from left to right between described left frame (13) and dipper crowding gear (10) and is provided with three bending hydraulic means (9), the front portion, left side of dipper crowding gear (10) is fixedly installed the first fixture (1), the right front of left frame (13) is fixedly installed the second fixture (4), fromer rail is provided with between described left frame (13) and dipper crowding gear (10), described fromer rail straight line between the second fixture (4) and the first fixture (1) extends, and when dipper crowding gear (10) slides along described dovetail guide (15), the first fixture (1) can slide along fromer rail towards the second fixture (4), described fromer rail is also provided with between the second fixture (4) and the first fixture (1) the 3rd fixture (3) and the 4th fixture (2) slidably, four described fixtures (1,2,3,4) include clip base, rear fixture block (41) and front fixture block (42), the described rear fixture block (41) of each described fixture and front fixture block (42) are all relatively arranged along the fore-and-aft direction in the plane of bending when described boiler tube generation plain bending, and can realize contact gripping and be separated the action of unclamping in clip base, wherein, described rear fixture block (41) is all positioned at described fromer rail rear, and is rectangular shape, and described front fixture block (42) is all positioned at described fromer rail front, and is cylindrical shape, the longitudinal axis of described rectangular shape and cylindrical shape is all perpendicular to plane of bending during described boiler tube generation plain bending,
Wherein, the right flank of the rear fixture block of described second fixture (4) is provided with the right extension limited block (43) extended to the right, the left surface of the rear fixture block of described first fixture (1) is provided with the left extension limited block (14) extended to the left, the left and right side of the rear fixture block of the 3rd fixture (3) and the 4th fixture (2) is provided with respectively the left extension limited block extended to the left and the right extension limited block extended to the right;
Each in described three bending hydraulic means (9) includes driving hydraulic cylinder, and described driving hydraulic cylinder is arranged relative to the longitudinal axis orthogonal of dovetail guide (15), and can slide dovetail guide (15) is upper; The hydraulic stem end of described driving hydraulic cylinder is hinged with bending rolling (91), and drives hydraulic cylinder can drive bending the bend pipe thrust of rolling (91) and applying forward along the direction vertical with dovetail guide (15); Each in described three bending hydraulic means (9) all also comprises hoofing part mechanism, slides into diverse location in order to drive corresponding bending hydraulic means (9) respectively along dovetail guide (15);
The right side of described dipper crowding gear (10) is provided with support bar telescoping mechanism (12), support bar telescoping mechanism (12) is arranged on the front of described dovetail guide (15), support bar telescoping mechanism (12) has retractility support bar (120), retractility support bar (120) can be used in extending in described boiler tube through the left side leaving dipper crowding gear (10) from the right side of dipper crowding gear (10), thus play the effect supporting boiler tube and prevent boiler tube generation undesirably bending, and can move back and forth in the lateral direction under the driving of support bar telescoping mechanism (12),
Described crooking of the tubes technique comprises the steps:
A., linear pattern boiler tube is provided;
B. described linear pattern boiler tube penetrated a through hole on described left frame (13) and advance to the right, until the length thereof that described linear pattern boiler tube will carry out bending machining stretches out in described left frame (13);
C. the left end of described linear pattern boiler tube clamps by described second fixture (4);
D. dipper crowding gear (10) motion, with the right-hand member making the first fixture (1) clamp linear pattern boiler tube;
E. the 3rd fixture (3) and the 4th fixture (2) clamp linear pattern boiler tube between the second fixture (4) and the first fixture (1), and make the second fixture (4), the 3rd fixture (3), the 4th fixture (2) and the first fixture (1) forearm of linear pattern boiler tube is separated into three equal length sections of length; Described fromer rail is fixedly installed left chucking position detecting sensor and right chucking position detecting sensor, wherein, the left chucking position detecting sensor of described fromer rail when the position of the 3rd fixture (3) with it to sending signal time corresponding, the right chucking position detecting sensor of described fromer rail when the position of the 4th fixture (2) with it to sending signal time corresponding; Described chucking position detecting sensor on fromer rail is positioned to contribute to realizing the corresponding processing sections of boiler tube to be divided into three equal length sections of described length on fromer rail, described location aware sensor is hall effect sensor and magnetic effect sensor, or one is hall effect sensor, another is magnetic effect sensor;
F. each in described three bending hydraulic means (9) makes it bendingly roll the mid point that (91) contact corresponding each length section in described three length sections respectively;
G. retractility support bar (120) stretches in the pipe of linear pattern boiler tube by the support bar telescoping mechanism (12) of dipper crowding gear (10), and first length section from left to right stayed in described three length sections is not supported, from left to right second and the 3rd length section supported;
H. bending outwards described first length section of top pressure that begin of getting away of the bending hydraulic means (9) in left side, thus it is bending to make it that linear occur, dipper crowding gear (10) synchronously follows pushing along with bending carrying out, meanwhile, the 3rd fixture (3), the 4th fixture (2) also synchronously accompany movement; In the process of top pressure, the bending hydraulic means (9) in left side to left movement, thus makes it bending roll the position keeping corresponding to described first length section mid point under the driving of its hoofing part mechanism; When the right extension limited block (43) of the second fixture (4) contacts with the left extension limited block of the 3rd fixture (3), bending the rolling of the bending hydraulic means (9) in described left side stops top pressure, and dipper crowding gear (10) stops continuing urged forward;
I. retractility support bar (120) bounces back by the support bar telescoping mechanism (12) of dipper crowding gear (10), thus first length section from left to right making to stay in described three length sections and from left to right second length section are not all supported, the 3rd length section is supported from left to right;
J. the bending hydraulic means (9) in the middle of starts second length section from left to right described in the pressure of top, until the right extension limited block of the 3rd fixture (3) contacts with the left extension limited block of the 4th fixture (2);
K. dipper crowding gear (10) makes described support bar (120) bounce back completely, is not all supported to make three length sections;
L. the bending hydraulic means (9) on right side starts the 3rd length section from left to right described in the pressure of top, until the right extension limited block of the 4th fixture (2) contacts with the left extension limited block of the first fixture (1);
M. each fixture unclamps, and takes the heating furnace tube that bending machining is complete away;
N. heating furnace tube complete for bending machining is put into destressing heat-treatment furnace and carry out stress relief annealing, the process conditions of annealing are: holding temperature 300 degrees Celsius, temperature retention time 3 hours.
CN201410147223.0A 2014-04-14 2014-04-14 A kind of bending process of linear pattern heating furnace tube Active CN103934333B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3762196A (en) * 1970-07-29 1973-10-02 D Kempken Pipe bending machine
US4112728A (en) * 1975-08-22 1978-09-12 Deutsche Babcock Aktiengesellschaft Device for bending pipes
CN201940475U (en) * 2010-12-09 2011-08-24 江苏金方圆数控机床有限公司 Flat bending mould
CN103191962A (en) * 2013-04-22 2013-07-10 天津凯创拓达金属结构有限公司 Multi-angle bender
CN203437475U (en) * 2013-07-08 2014-02-19 常州市常蒸制冷科技有限公司 Connecting pipe forming tool

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3762196A (en) * 1970-07-29 1973-10-02 D Kempken Pipe bending machine
US4112728A (en) * 1975-08-22 1978-09-12 Deutsche Babcock Aktiengesellschaft Device for bending pipes
CN201940475U (en) * 2010-12-09 2011-08-24 江苏金方圆数控机床有限公司 Flat bending mould
CN103191962A (en) * 2013-04-22 2013-07-10 天津凯创拓达金属结构有限公司 Multi-angle bender
CN203437475U (en) * 2013-07-08 2014-02-19 常州市常蒸制冷科技有限公司 Connecting pipe forming tool

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