CN113732128A

CN113732128A - A seamless bending device and bending method

Info

Publication number: CN113732128A
Application number: CN202110985947.2A
Authority: CN
Inventors: 王亦伟; 董春涛; 钟海泉; 焦刚勇
Original assignee: Zhuhai Fuji Intelligent Co ltd
Current assignee: Zhuhai Fuji Intelligent Co ltd
Priority date: 2021-08-26
Filing date: 2021-08-26
Publication date: 2021-12-03

Abstract

The invention discloses a seamless bending device, comprising: a frame; a workpiece placing table connected to the frame; the workpiece placing table is provided with a profiling recess, and the workpiece placing table is used for placing L-shaped workpieces; a bending head, slidingly connected The frame, the bending head can slide in the front and rear directions, the upper end of the bending head is protruded with a stop, the front end of the bending head is used to push the web of the L-shaped workpiece, and the front end of the stop is used to push the L-shaped workpiece. The side plate, the bending head cooperates with the profiling recess to bend the L-shaped workpiece, and a stop is set on the bending head. When the front end of the bending head abuts on the web of the L-shaped workpiece, the front end of the stop can be Abutting the rear end edge of the side plate of the L-shaped workpiece, because the web and the side plate of the L-shaped workpiece are abutted, and the bending head cooperates with the profiling recess, so that the side plate of the L-shaped workpiece is not bent when it is bent. There will be extrusion bulge deformation. After the L-shaped workpiece is bent, there is no gap at the bending of the side plate, and the bent L-shaped workpiece is suitable for use.

Description

Seamless bending device and bending method

Technical Field

The invention relates to the technical field of bending, in particular to a seamless bending device and a bending method.

Background

The L-shaped workpiece is a long workpiece with an L-shaped cross section, is similar to angle steel, and consists of a web plate and a side plate.

Conventionally, when an L-shaped workpiece is bent, a bending head is brought into contact with a web of the L-shaped workpiece to push the L-shaped workpiece into a profiling recess to bend the L-shaped workpiece, and in order to avoid deformation of an edge plate due to extrusion bulging, an opening is required in the edge plate, the L-shaped workpiece having the opening in the edge plate has a gap after bending, and the L-shaped workpiece having the gap in the edge plate is not suitable for use.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a seamless bending device which can bend an L-shaped workpiece, and the bent L-shaped workpiece has no gap at the bending position and is suitable for use.

The invention further provides a bending method.

According to an embodiment of the first aspect of the invention, a seamless bending device comprises: a frame; the workpiece placing table is connected with the rack and provided with a profiling concave part, and the workpiece placing table is used for placing the L-shaped workpiece; the bending head is connected with the rack in a sliding mode, the bending head can slide in the front-back direction, a blocking table is convexly arranged at the upper end of the bending head, the front end of the bending head is used for pushing a web plate of the L-shaped workpiece, the front end of the blocking table is used for pushing a side plate of the L-shaped workpiece, and the bending head is matched with the profiling concave portion to bend the L-shaped workpiece.

The seamless bending device provided by the embodiment of the invention at least has the following beneficial effects: the bending head is provided with the baffle table, when the front end of the bent head abuts against the web plate of the L-shaped workpiece, the front end of the baffle table can abut against the rear end edge of the side plate of the L-shaped workpiece, because the web plate and the side plate of the L-shaped workpiece are abutted against each other, and the bent head is matched with the profiling concave part, so that the side plate of the L-shaped workpiece cannot be extruded, bulged and deformed when the L-shaped workpiece is bent, no gap is formed at the bent part of the side plate after the L-shaped workpiece is bent, and the bent L-shaped workpiece is suitable for use.

According to some embodiments of the present invention, the bending head and the blocking platform are both arranged in a V shape, after the L-shaped workpiece is bent, the bending position of the L-shaped workpiece is taken as a boundary line, the web of the L-shaped workpiece is divided into two adjacent sections, two inclined planes of the V-shaped bending head respectively abut against the two adjacent sections of the web of the L-shaped workpiece, that is, the bending head of the V shape can limit the bending angle of the web of the L-shaped workpiece, and similarly, the blocking platform of the V shape is also used for limiting the bending angle of the side plate of the L-shaped workpiece.

According to some embodiments of the invention, the lower end of the bend is provided with a receding groove for accommodating a wing plate of the L-shaped workpiece, and the receding groove is arranged to prevent the wing plate of the L-shaped workpiece from causing mechanical interference on the bend.

According to some embodiments of the invention, the workpiece placing table comprises: the support plate is connected with the rack and arranged in front of the bending head; the copying bending plate is connected to the upper end of the supporting plate, and the copying concave part is arranged at the rear end of the copying bending plate; the sealing plate is connected to the upper end of the copying bending plate, the left end and the right end of the sealing plate are provided with first step platforms, a heating coil is embedded in the sealing plate, and a preheating space is defined by the sealing plate, the copying bending plate and the supporting plate; two fixed plates are connected the profile modeling board of bending, two the fixed plate sets up respectively the left end and the right-hand member of shrouding, be provided with the second step on the fixed plate, second step lock joint first step, simple structure, easy to assemble and dismantlement.

According to some embodiments of the invention, the bending machine further comprises a positioning component, the positioning component is movably connected with the machine frame and is used for connecting the L-shaped workpiece, and the positioning component is arranged to prevent the L-shaped workpiece from being distorted and deformed when the L-shaped workpiece is bent.

According to some embodiments of the invention, the positioning assembly comprises: the articulated shaft is connected with the rack in a sliding manner, can slide along the front and back direction and extends along the vertical direction; one end of each of the two driving rods is rotatably connected with the hinge shaft, and the rotating axis of each driving rod extends vertically; the reference column, the reference column with the actuating lever one-to-one, the reference column is connected the other end of actuating lever, two the reference column is arranged along left right direction, the reference column is used for rotating the grafting L shape work piece, simple structure, the reference column that sets up can with L shape work piece is fixed, because the articulated shaft is sliding connection the frame, the actuating lever rotates to be connected the articulated shaft, the reference column rotates again to be pegged graft L shape work piece, so the reference column can not influence the bending process of L shape work piece, the reference column is used for preventing L shape work piece is in the upset of front and back direction.

According to some embodiments of the present invention, the frame is provided with a waist hole, a length direction of the waist hole extends along a front-back direction, the hinge shaft is slidably connected in the waist hole, and the waist hole facilitates sliding of the hinge shaft.

According to some embodiments of the invention, the bending device further comprises at least two guide blocks, the at least two guide blocks are arranged at intervals in the left-right direction, the at least two guide blocks define a guide channel in the left-right direction, the guide channel extends along the front-back direction, and the bending head can slide in the guide channel, so that the sliding direction of the bending head is fixed, and the bending head is prevented from deviating from the sliding direction due to the influence of external force, thereby influencing the bending process.

According to some embodiments of the invention, the bending device further comprises a power part, the power part is connected with the bending head, the power part is used for driving the bending head to move in the front-back direction, the power part can provide stable thrust, manual force application is omitted, manpower is saved, and bending efficiency is improved.

A bending method according to an embodiment of the first aspect of the present invention includes the steps of:

placing a workpiece, placing the L-shaped workpiece on a workpiece placing table, and aligning the bending part of the L-shaped workpiece with the profiling concave part;

preheating a workpiece, namely accommodating the L-shaped workpiece in a preheating space, and locally preheating the bent part of the L-shaped workpiece by a built-in heating coil on the sealing plate;

the workpiece is abutted, the bending head is driven to slide forwards, the front end of the bending head is abutted against a web plate at the bending position of the L-shaped workpiece, and meanwhile, the front end of a baffle table on the bending head is abutted against a side plate at the bending position of the L-shaped workpiece;

and bending, namely driving the bending head to continuously move forwards, so that the bending head pushes the L-shaped workpiece into the profiling concave part, and the bending head is matched with the profiling concave part to bend the L-shaped workpiece.

According to the bending method provided by the embodiment of the invention, at least the following beneficial effects are achieved: the baffle table is arranged on the bending head, when the front end of the bending head abuts against the web plate of the L-shaped workpiece, the front end of the baffle table can abut against the rear end edge of the side plate of the L-shaped workpiece, because the web plate and the side plate of the L-shaped workpiece are both abutted against, and the bending head is matched with the profiling concave part, the side plate of the L-shaped workpiece cannot generate extrusion bulging deformation when the L-shaped workpiece is bent, no gap exists at the bending position of the side plate after the L-shaped workpiece is bent, and the bent L-shaped workpiece is suitable for use; in addition, the L-shaped workpiece is preheated by the heating coil, so that the bending process is easier and smoother, the preheating space is arranged for collecting heat, the L-shaped workpiece can be preheated more quickly, and the preheating space can also play a role in limiting the upward arching of the L-shaped workpiece in the bending process.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural diagram of a seamless bending apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic view of the seamless bending apparatus shown in FIG. 1 with clamping blocks;

FIG. 3 is an exploded view of the seamless bending apparatus shown in FIG. 2;

FIG. 4 is a schematic view of the seamless bending apparatus shown in FIG. 1 with the workpiece positioning table and positioning assembly removed;

FIG. 5 is a schematic diagram of the bending head of the seamless bending apparatus shown in FIG. 1 abutting an L-shaped workpiece;

fig. 6 is an exploded view of fig. 5.

The frame 100, the waist hole 110, the guide block 120 and the guide channel 121;

a workpiece placing table 200, a supporting plate 210, a copying bending plate 220, a sealing plate 230, a first step 231, a heating coil 232, a fixing plate 240, a second step 241, a copying concave part 250, a clamping block 251 and a preheating space 260;

the bend 300, the baffle table 310 and the abdicating groove 320;

the positioning assembly 400, the hinge shaft 410, the driving rod 420 and the positioning column 430;

a power member 500;

an L-shaped workpiece 600, a web 610, a wing panel 611, and an edge panel 620.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1 to 6, a seamless bending apparatus includes: a frame 100; a workpiece placing table 200 connected to the frame 100, the workpiece placing table 200 being provided with a profiling recess 250, the workpiece placing table 200 being used for placing an L-shaped workpiece 600; the bending head 300 is connected with the machine frame 100 in a sliding manner, the bending head 300 can slide along the front-back direction, the upper end of the bending head 300 is convexly provided with a baffle table 310, the front end of the bending head 300 is used for pushing a web 610 of the L-shaped workpiece 600, the front end of the baffle table 310 is used for pushing a side plate 620 of the L-shaped workpiece 600, the bending head 300 is matched with the profiling concave part 250 to bend the L-shaped workpiece 600, the baffle table 310 is arranged on the bending head 300, when the front end of the bending head 300 is abutted against the web 610 of the L-shaped workpiece 600, the front end of the baffle table 310 can be abutted against the rear end edge of the side plate 620 of the L-shaped workpiece 600, because the web 610 and the side plate 620 of the L-shaped workpiece 600 are abutted against, and the bending head 300 is matched with the profiling concave part 250, the side plate 620 of the L-shaped workpiece 600 can not generate extrusion bulging deformation when being bent, and no gap is formed at the bending position of the side plate 620 after the L-shaped workpiece 600 is bent, and the L-shaped workpiece 600 after being bent is suitable for use, it can be understood that, because of the use requirement, the web 610 of the L-shaped workpiece 600 is further connected with a wing plate 611, the baffle table 310 protrudes upwards to form the bending head 300, a predetermined distance is set from the front end of the bending head 300 to the front end of the baffle table 310, and the predetermined distance is the width of the side plate 620 in the front-back direction, it can be understood that the L-shaped workpiece 600 is a long workpiece with an L-shaped cross section, which is similar to an angle iron, the L-shaped workpiece 600 is composed of the web 610 and the side plate 620, and because of the use requirement, the web 610 of some L-shaped workpieces is further provided with the wing plate 611; note that the workpiece placing table 200 is provided in front of the bending head 300.

In some embodiments, referring to fig. 2 and 3, two clamping blocks 251 are connected in the profiling recess 250, the front ends of the two clamping blocks 251 are abutted, the rear ends of the two clamping blocks 251 are separated, the included angle between the two clamping blocks 251 is a right angle, the L-shaped workpiece can be pushed into the space between the two clamping blocks 251, and the L-shaped workpiece can be bent by 90 ° under the limitation of the two clamping blocks 251.

In some embodiments, the bending head 300 and the stopping platform 310 are both arranged in a V shape, after the L-shaped workpiece 600 is bent, the bent portion of the L-shaped workpiece 600 is taken as a boundary line, the web 610 of the L-shaped workpiece 600 is divided into two adjacent sections, two inclined surfaces of the V-shaped bending head 300 respectively abut against the two adjacent sections of the web 610 of the L-shaped workpiece 600, that is, the V-shaped bending head 300 can limit the bending angle of the web 610 of the L-shaped workpiece 600, and similarly, the V-shaped stopping platform 310 is also used for limiting the bending angle of the side plate 620 of the L-shaped workpiece 600.

In some embodiments, the lower end of the bending head 300 is provided with a relief groove 320, the relief groove 320 is used for accommodating the wing plate 611 of the L-shaped workpiece 600, the relief groove 320 is arranged to prevent the wing plate 611 of the L-shaped workpiece 600 from causing mechanical interference with the bending head 300, it is to be noted that the relief groove 320 is also arranged in a V shape, so that the wing plate 611 can be snapped into the V-shaped relief groove 320 after the L-shaped workpiece 600 is bent.

It is noted that the apexes of the V-shaped tips of the bending head 300, the abutment 310 and the abdicating groove 320 are in the same vertical plane, and the V-shaped tips are all directed forward.

In some embodiments, the workpiece placement station 200 includes: a support plate 210 connected to the frame 100, the support plate 210 being disposed in front of the bending head 300; a profile bending plate 220 connected to an upper end of the support plate 210, the profile recess 250 being provided at a rear end of the profile bending plate 220; the sealing plate 230 is connected to the upper end of the profile bending plate 220, the left end and the right end of the sealing plate 230 are both provided with a first step 231, a heating coil 232 is embedded in the sealing plate 230, and a preheating space 260 is defined by the sealing plate 230, the profile bending plate 220 and the support plate 210; two fixed plates 240 connect the profile modeling board 220 of bending, and two fixed plates set up respectively at the left end and the right-hand member of shrouding 230, are provided with second step 241 on the fixed plate, and first step 231 is buckled to second step 241, simple structure, and easy to assemble and dismantlement can understand, and first step 231 and second step 241 lock joint each other.

In some embodiments, the heating coil 232 is embedded in the sealing plate 230, the sealing plate 230 protrudes backward, the rear end of the bending plate 220 is located forward than the rear end of the sealing plate 230, the bending plate 220 and the support plate 210 define a preheating space, the L-shaped workpiece 600 is placed in the preheating space before bending, and the bending portion of the L-shaped workpiece 600 is aligned with the bending recess 250.

In some embodiments, the positioning assembly 400 is further included, the positioning assembly 400 is movably connected with the frame 100, the positioning assembly 400 is used for connecting the L-shaped workpiece 600, and the positioning assembly 400 is arranged to prevent the L-shaped workpiece 600 from being distorted when being bent.

In some embodiments, the positioning assembly 400 includes: a hinge shaft 410 slidably coupled to the frame 100, the hinge shaft 410 being slidable in a front-rear direction, the hinge shaft 410 extending vertically; two driving rods 420, wherein one end of each driving rod 420 is rotatably connected with the hinge shaft 410, and the rotating axis of each driving rod 420 extends vertically; reference column 430, reference column 430 and actuating lever 420 one-to-one, the other end at actuating lever 420 is connected to reference column 430, two reference columns 430 are arranged along left right direction, reference column 430 is used for rotating grafting L shape work piece 600, moreover, the steam generator is simple in structure, the reference column 430 that sets up can be fixed L shape work piece 600, because articulated shaft 410 is sliding connection frame 100, actuating lever 420 rotates and connects articulated shaft 410, reference column 430 rotates grafting L shape work piece 600 again, so reference column 430 can not influence the bending process of L shape work piece 600, reference column 430 is used for preventing L shape work piece 600 from overturning in the front and back direction. It can be understood that the hinge shaft 410 is connected with a linear driving device, such as an air cylinder or a hydraulic cylinder, etc., and because the hinge shaft 410, the driving rod 420 and the positioning column 430 are connected into a whole, the hinge shaft 410 slides in the front-back direction, and simultaneously, the driving rod 420 and the positioning column 430 also move in the front-back direction, i.e., the linear driving device can pull the L-shaped workpiece into the profiling recess 250 through the positioning column 430, and can perform a bending operation on the L-shaped workpiece 600 more easily in cooperation with the bending head 300.

In some embodiments, the positioning assembly 400 may also be a robotic arm.

In some embodiments, the frame 100 is provided with a waist hole 110, the length direction of the waist hole 110 extends along the front-back direction, the hinge shaft 410 is slidably connected in the waist hole 110, and the waist hole 110 facilitates the sliding of the hinge shaft 410.

In some embodiments, the bending device further comprises at least two guide blocks 120, the at least two guide blocks 120 are spaced in the left-right direction, the at least two guide blocks 120 define a guide channel 121 in the left-right direction, the guide channel 121 extends in the front-back direction, and the bending head 300 can slide in the guide channel 121, so that the sliding direction of the bending head 300 is fixed, and the bending head 300 is prevented from deviating from the sliding direction due to the influence of an external force, thereby influencing the bending process.

In some embodiments, the power member 500 is further included, the power member 500 is connected to the bending head 300, the power member 500 is used for driving the bending head 300 to move in the front-back direction, the power member 500 can provide stable thrust, manual force application is omitted, manpower is saved, and bending efficiency is improved.

In some embodiments, the bending head 300 is detachably connected to the power member 500, so that different bending heads 300 can be replaced conveniently.

A method of bending comprising the steps of:

placing a workpiece, placing the L-shaped workpiece 600 on the workpiece placing table 200, and aligning the bending part of the L-shaped workpiece 600 with the profiling concave part 250;

preheating the workpiece, namely accommodating the L-shaped workpiece 600 in the preheating space 260, and locally preheating the bending part of the L-shaped workpiece 600 by the built-in heating coil 232 on the sealing plate 230;

the workpiece is abutted, the bending head 300 is driven to slide forwards, the front end of the bending head 300 is abutted to a web plate 610 at the bending part of the L-shaped workpiece 600, and meanwhile, the front end of a baffle table 310 on the bending head 300 is abutted to a side plate 620 at the bending part of the L-shaped workpiece 600;

and (3) bending, driving the bending head 300 to move forwards continuously, so that the bending head 300 pushes the L-shaped workpiece 600 into the profiling concave part 250, and the bending head 300 and the profiling concave part 250 are matched to bend the L-shaped workpiece 600.

The bending head 300 is provided with the baffle table 310, when the front end of the bent head 300 abuts against the web 610 of the L-shaped workpiece 600, the front end of the baffle table 310 can abut against the rear end edge of the side plate 620 of the L-shaped workpiece 600, because the web 610 and the side plate 620 of the L-shaped workpiece 600 are both abutted against, and the bent head 300 is matched with the profiling concave part 250, the side plate 620 of the L-shaped workpiece 600 can not generate extrusion bulging deformation when the L-shaped workpiece 600 is bent, no gap exists at the bent part of the side plate 620 after the L-shaped workpiece 600 is bent, and the bent L-shaped workpiece 600 is suitable for use; in addition, the L-shaped workpiece is preheated by the heating coil 232, so that the bending process is easier and smoother, the preheating space 260 is provided to collect heat, so that the L-shaped workpiece 600 can be preheated more quickly, and the preheating space 260 also plays a role in limiting the L-shaped workpiece 600 from arching upwards during the bending process, it can be understood that the heating coil 232 generates an eddy current effect on the L-shaped workpiece 600, and the L-shaped workpiece 600 is heated by the eddy current.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. a seamless bending device for bending an L-shaped workpiece, characterized in that, comprising:

frame;

a workpiece placing table, connected to the frame, the workpiece placing table is provided with a profiling recess, and the workpiece placing table is used for placing the L-shaped workpiece;

The bending head is slidably connected to the frame, the bending head can slide in the front-rear direction, the upper end of the bending head is protruded with a stop, and the front end of the bending head is used to push the L-shaped head The web of the workpiece, the front end of the stop is used to push up the side plate of the L-shaped workpiece, and the bending head cooperates with the profiling recess to bend the L-shaped workpiece.

2 . The seamless bending device according to claim 1 , wherein the bending head and the stop are both set in a V shape. 3 .

3. A seamless bending device according to claim 2, characterized in that: the lower end of the bending head is provided with a let-away groove, and the let-away groove is used for accommodating the wings of the L-shaped workpiece plate.

4. A seamless bending device according to claim 1, wherein the workpiece placing table comprises:

a support plate, connected to the frame, the support plate is arranged in front of the bending head;

The profiling bending plate is connected to the upper end of the support plate, and the profiling recess is arranged at the rear end of the profiling bending plate;

The sealing plate is connected to the upper end of the profiling bending plate, the left end and the right end of the sealing plate are both provided with a first step platform, a heating coil is embedded in the sealing plate, the sealing plate, the The profiling bending plate and the supporting plate define a preheating space;

Two fixed plates are connected to the profiling bending plate, the two fixed plates are respectively arranged on the left end and the right end of the sealing plate, and the fixed plate is provided with a second step platform, the second step platform The first step platform is buckled.

5 . The seamless bending device according to claim 1 , further comprising a positioning assembly, the positioning assembly is movably connected to the frame, and the positioning assembly is used to connect the L-shaped workpiece. 6 .

6. The seamless bending device according to claim 5, wherein the positioning assembly comprises:

a hinge shaft, slidably connected to the frame, the hinge shaft can slide in the front-rear direction, and the hinge shaft extends vertically;

two driving rods, each of which is connected to the hinge shaft at one end in rotation, and the rotation axis of the driving rod extends vertically;

The positioning column corresponds to the driving rod one-to-one. The positioning column is connected to the other end of the driving rod. The two positioning columns are arranged in the left and right direction. The positioning columns are used for rotating and plugging. The L-shaped workpiece.

7 . The seamless bending device according to claim 6 , wherein the frame is provided with a waist hole, the length direction of the waist hole extends in the front-rear direction, and the hinge shaft is slidably connected to the in the waist hole.

8 . The seamless bending device according to claim 1 , further comprising at least two guide blocks, the at least two guide blocks are arranged at intervals in the left-right direction, and the at least two guide blocks are arranged at intervals in the left-right direction. 9 . The guide block defines a guide channel in the left-right direction, the guide channel extends in the front-rear direction, and the bending head can slide in the guide channel.

9. A seamless bending device according to any one of claims 1 to 8, characterized in that: further comprising a power member, the power member is connected to the bending head, and the power member is used to drive the The bending head moves in the front-rear direction.

10. A bending method, characterized in that, comprising the following steps:

Place the workpiece, place the L-shaped workpiece on the workpiece placement table, and align the bending of the L-shaped workpiece with the profiling recess;

Preheating the workpiece, the built-in heating coil on the sealing plate preheats the bending part of the L-shaped workpiece locally;

Abut the workpiece, drive the bending head to slide forward, so that the front end of the bending head abuts against the web at the bend of the L-shaped workpiece, and at the same time, the front end of the stop on the bending head abuts the edge of the L-shaped workpiece at the bend plate;

Bending, drive the bending head to continue to move forward, so that the bending head pushes the L-shaped workpiece into the profiling recess, and the bending head and the profiling recess cooperate to bend the L-shaped workpiece.