CN111299377A - Metal material bending device and method - Google Patents
Metal material bending device and method Download PDFInfo
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- CN111299377A CN111299377A CN201911009552.8A CN201911009552A CN111299377A CN 111299377 A CN111299377 A CN 111299377A CN 201911009552 A CN201911009552 A CN 201911009552A CN 111299377 A CN111299377 A CN 111299377A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/08—Bending rods, profiles, or tubes by passing between rollers or through a curved die
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/12—Bending rods, profiles, or tubes with programme control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
Abstract
The invention relates to a metal material bending method and a processing device, wherein the device comprises: the bending mechanism, the rotating platform (6), the frame (5) and the stretching device; the bending mechanism is arranged at the upper part of the frame (5); the rotary platform (6) and the stretching device are both of a symmetrical structure, and the rotary platform (6) is arranged on two sides of the rack (5); the stretching device is arranged on the rotating platform (6); a metal material workpiece (4) penetrates through the bending mechanism and is placed on the rack (5), and two ends of the metal material workpiece are respectively and fixedly connected to the stretching devices on two sides of the rack (5); the stretching device provides tension for the metal material workpiece (4), so that the defects of wrinkling, waving and the like of a product are effectively overcome, and the roll bending forming quality is improved. The main principle of the processing method is that tensile stress is introduced into the roll bending forming process, and the stress state of a workpiece is changed, so that the purpose of improving the defects of wrinkling, waves and the like of the workpiece is achieved.
Description
Technical Field
The invention relates to the technical field of metal material bending processing, in particular to a metal material bending processing device and a metal material bending processing method.
Background
The existing bending process is an important processing method of metal materials, bent products are widely applied to the industries of aerospace, transportation, electric power, chemical engineering, pharmacy and the like, particularly, along with the rapid development of light weight of automobiles, the aluminum alloy section bending structure is applied to parts such as an anti-collision beam, a roof side beam, an A column and the like in a large scale, and meanwhile, higher and higher requirements are provided for the quality of the bent products.
Bending processes can be divided into two categories according to the forming principle: one is bending forming, such as stretch bending, bending around, bending and the like, depending on the shape of a mold; and the other type of bending forming, such as roll bending and the like, depends on the relative displacement between the workpiece and the die. The metal bending process adopts a roll bending forming process, however, roll bending is plastic bending deformation generated by the action of the stress of a workpiece between rollers, so that the defects of wrinkling, wave equal pressure and stress instability generally exist in production, and in addition, because the stress states of the inner side and the outer side of the workpiece are inconsistent in the roll bending process, the elastic recovery directions are inconsistent after unloading, so that the shape and the size change are large, the problems of springback, twisting and the like are prominent, manual trimming needs to be added, so that the production cost is increased, the production efficiency is reduced, and even the product is scrapped.
In order to solve the above problems in roll bending, chinese patent CN208758405U discloses a workpiece clamping mechanism of a roll bending machine, which is used for clamping and limiting a profile in a roll bending process, so as to prevent the profile from slight displacement such as end tilting in the process of processing, and further improve the problem of dimensional deviation caused by workpiece displacement. Chinese patent CN208575136U discloses a high-precision radian roll bending device, which can eliminate the straight line segment defects at two ends of a workpiece by adding two upper and lower rollers capable of moving up and down and left and right on the basis of a traditional roll bending machine, thereby reducing the production cost and reducing the material waste.
From patent analysis, the idea of solving the quality problem of roll bending is to optimally control the production and manufacturing process by adding auxiliary tools without changing the deformation characteristics of roll bending formed workpieces, so that the quality problem of roll bending is difficult to effectively solve.
Disclosure of Invention
In order to solve the roll bending quality problem in the prior art, the invention provides a system and a method for improving the quality of roll bending formed products.
The technical scheme provided by the invention is as follows:
a metal material bending apparatus comprising: the bending mechanism, the rotating platform (6), the frame (5) and the stretching device;
the bending mechanism is arranged at the upper part of the frame (5);
the rotary platform (6) and the stretching device are both of a symmetrical structure, and the rotary platform (6) is arranged on two sides of the rack (5); the stretching device is arranged on the rotating platform (6);
a metal material workpiece (4) penetrates through the bending mechanism and is placed on the rack (5), and two ends of the metal material workpiece are respectively and fixedly connected to the stretching devices on two sides of the rack (5);
the stretching device provides a tensioning force for the metal material workpiece (4).
Preferably, the stretching device includes: a stretching mechanism (9);
the stretching mechanism (9) is driven by hydraulic pressure.
Preferably, the stretching device further comprises: a moving slide block (7), a fixing device (8) and a clamping device (10);
the fixing device (8) and the clamping device (10) are respectively arranged at two ends of the stretching mechanism (9); the fixing device (8) is arranged on the rotating platform (6) in a sliding manner through the moving slide block (7); the clamping device (10) is used for clamping the metal material workpiece (4);
wherein the length of the stretching mechanism (9) is less than the length of the rotating platform (6).
Preferably, the rotating platform (6) is of a cylindrical structure, and the moving slide block (7) is of a cube structure with a groove on the bottom surface;
the groove structure is clamped on the rotating platform (6) and can horizontally slide along the rotating platform (6).
Preferably, the fixing device (8) is in a U shape of a laid down;
the stretching structure (9) is fixed in a U-shaped clamping groove of the fixing device (8);
one side of the U-shaped clamping groove of the fixing device (8) is fixedly arranged on the moving slide block (7). 6. The apparatus of claim 1, further comprising: a stress sensor and a displacement sensor;
the stress sensor and the displacement sensor are respectively arranged on the stretching mechanism (9);
the stress sensor is used for monitoring the tensile deformation state of the metal material workpiece (4) in real time;
the displacement sensor is used for determining the horizontal displacement of the stretching mechanism (9) and the rotation angle of the rotating platform (6) by monitoring the length of the metal material workpiece (4).
Preferably, the apparatus further comprises: two rotating platform fixing devices (11), rotating platform fixing devices (11) are arranged on two sides of the rack (5), and the rotating platform (6) is rotatably connected with the rotating platform fixing devices (11).
Preferably, the bending mechanism includes: a first bending roller (1), a second bending roller (2) and a third bending roller (3);
the metal material workpiece (4) passes through the bending mechanism.
A metal material bending method characterized by processing a metal material (4) using a metal material bending apparatus, the method comprising:
arranging a bending mechanism on a rack (5), and adjusting the position of the bending mechanism to enable a metal material workpiece (4) to pass through gaps between the bending mechanisms;
the frame (5) is rotationally connected with the stretching device through the rotating platform (6), so that the stretching device clamps and prestretches two ends of the metal material workpiece (4);
further, the bending mechanism bends the metal workpiece (4).
Preferably, the frame (5) is rotatably connected with a stretching device through a rotating platform (6), so that the stretching device can tighten and pre-stretch two ends of the metal material workpiece (4), and the stretching device comprises:
a stretching mechanism (9) of the stretching device is fixed on the moving slide block (7) through a fixing device (8);
moving a clamping device (10) on a stretching mechanism (9) along the horizontal direction of a rotating platform (6), so that the stretching mechanism (9) continuously keeps the tension (F) on the metal material workpiece (4) while the metal material workpiece (4) is bent and deformed;
the cross section of the metal material workpiece (4) is completely in a tensile stress state.
A control system for a bending process of a metallic material, the control system (12) comprising:
metal material bending device to and with the host computer that metal material bending device is connected, the host computer includes:
the adjusting module is used for adjusting the position of the bending mechanisms so that the metal material workpiece (4) can pass through gaps among the bending mechanisms;
the control module is used for controlling the rotary platform (6) and the stretching device rotationally connected with the rack (5) so that the stretching device clamps and prestretches two ends of the metal material workpiece (4);
the bending module is used for bending the metal material workpiece (4).
Preferably, the control module includes:
the clamping control unit is used for controlling two ends of the metal material workpiece (4) so that the clamping control unit moves along the horizontal direction of the rotating platform (6);
the control module further comprises:
a stretching control unit for controlling to continuously maintain the stretching of the metallic material workpiece (4) while the metallic material workpiece (4) is bent and deformed.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a metal material bending device, comprising: the bending mechanism, the rotating platform (6), the frame (5) and the stretching device; the bending mechanism is arranged at the upper part of the frame (5); the rotary platform (6) and the stretching device are both of a symmetrical structure, and the rotary platform (6) is arranged on two sides of the rack (5); the stretching device is arranged on the rotating platform (6); a metal material workpiece (4) penetrates through the bending mechanism and is placed on the rack (5), and two ends of the metal material workpiece are respectively and fixedly connected to the stretching devices on two sides of the rack (5); the stretching device provides tension for the metal material workpiece (4), the system effectively improves the defects of wrinkling, waving and the like of products, improves the size precision of the products and improves the quality of roll-bending formed products.
2. The invention provides a metal material bending method, which comprises the following steps: arranging a bending mechanism on a frame 5, and adjusting the position of the bending mechanism to enable a workpiece 4 to pass through a gap between the bending mechanisms; the frame 5 is rotationally connected with the stretching device through a rotating platform 6, so that the stretching device clamps and prestretches two ends of the metal material workpiece 4; and then the bending mechanism bends the metal material workpiece 4, and the method can be realized by adding an auxiliary tool on the basis of the existing roll bending forming equipment, can realize online control and realize automatic production.
3. The invention provides a control system for bending metal materials, which has the advantages of simple equipment transformation, convenient installation and compact structure, and one piece of equipment can realize two procedures of a prestretching stage and a bending deformation stage.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1-a shows the pre-stretching stage of the present invention;
FIG. 1-b illustrates a bending stage of the present invention;
FIG. 2 is an isometric view of the apparatus of the present invention;
FIG. 3 is a top view of the apparatus of the present invention;
FIG. 4 is a side view of the apparatus of the present invention;
FIG. 5 is a schematic diagram showing the comparison of the maximum tensile stress inside the profile of the prior art with the apparatus of the present invention;
fig. 6 is a schematic diagram comparing the bending angle of the inner side of the profile in the prior art with the device of the present invention.
In the figure: 1-a first bending roll; 2-a second bending roll; 3-a third bending roll; 4-a workpiece; 5-a frame; 6-rotating the platform; 7-moving the slide block by the stretching mechanism; 8-a stretching mechanism fixing device; 9-a stretching mechanism; 10-hydraulic clamping means; 11-rotating platform fixing means; 12-a control system; f-pulling force.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
The invention provides a system and a method for improving the quality of roll-bending formed products, which mainly comprise the following parts: 1-a first bending roll; 2-a second bending roll; 3-a third bending roll; 4-a workpiece; 5-a frame; 6-rotating the platform; 7-moving the slide block by the stretching mechanism; 8-a stretching mechanism fixing device; 9-a stretching mechanism; 10-hydraulic clamping means; 11-rotating platform fixing means; 12-a control system; f-pulling force.
As shown in fig. 1-4, a bending process schematic, an apparatus isometric view, an apparatus top view, and an apparatus side view are provided, respectively.
The main idea of the invention is to introduce tensile stress when the workpiece is formed by roll bending, change the stress state of the workpiece, namely reduce the magnitude of compressive stress when the workpiece is bent, and further improve the forming quality of the product.
The specific idea is as follows:
the compressive stress is the main reason for generating wrinkle and wave defects when metal is bent, the inner side of the workpiece is in a compressive stress state when the workpiece is bent and deformed by roll bending, the magnitude of the compressive stress when the workpiece is bent is reduced by increasing the tensile stress, and even the workpiece is bent under the state of no compressive stress, so that the purpose of improving the instability defects of the compressive stress such as wrinkle and wave is achieved.
The metal can generate the rebound phenomenon after the forming is finished, according to the plastic forming principle, the rebound problem can be effectively improved by increasing the plastic deformation degree, and the purpose of increasing the deformation degree can be exactly achieved by introducing the tensile stress. On the other hand, the stress state of the section of the workpiece is changed by increasing the tensile stress, so that the whole section is under the action of the tensile stress, the bending moment generated by different stress states of the inner layer and the outer layer of the section can be reduced or even eliminated, and the rebound problems of twisting and the like are further improved.
Therefore, in the roll bending forming process of the workpiece, the deformation degree can be increased by introducing tensile stress, so that the rebound quantity after bending is reduced, and the purpose of improving the dimensional precision of the product is achieved.
In addition, during actual production, the performance fluctuation of the material is difficult to avoid, the performance difference of the material among different batches is large, and the instability of the material performance brings great challenges to process control, so that the product quality consistency is poor. The idea for solving the problems is to add a pre-stretching process in the roll bending forming process, and for raw materials with performance fluctuation, the yield state is achieved through pre-stretching, so that the materials enter a bending deformation stage after reaching the consistent yield state, and the dimensional precision consistency of the materials can be effectively improved.
According to the above thought, the technical scheme provided by the invention is as follows:
the workpiece bending deformation mainly comprises two stages, firstly, the workpiece is pre-stretched as shown in a in figure 1, so that the workpiece is enabled to yield, the difference of material properties of different batches is eliminated, then, the workpiece is roll-bent as shown in b in figure 1 under the condition of keeping a certain tensile stress, the magnitude of the tensile stress is adjusted according to the shape and the size of the workpiece, the material properties, the bending radian and the like, the compression stress on the inner side of the workpiece is eliminated as much as possible, and the section of the workpiece is enabled to be in the tensile stress state. In addition, for workpieces with complex shapes or three-dimensional bending, the rolling bending can be repeatedly performed back and forth according to the forming requirements.
In order to achieve the above technical solution, the present invention provides a bending apparatus, which can be implemented by modifying a conventional roll bending apparatus, and includes: a frame 5, a bending mechanism, a stretching mechanism 9, a stress sensor, a driving device, a control system 12 and the like,
crooked mechanism comprises a initiative bending roll and two driven bending rolls, specifically includes: the first bending roller 1, the second bending roller 2 and the third bending roller 3 mainly have the functions of realizing the bending deformation of the section bar,
the rotary platform 6 that the stretching mechanism 9 is fixed on the frame 5 is distributed on both sides of the bending mechanism, the stretching mechanism 9 is provided with a hydraulic clamping device 10 which can clamp and stretch the workpiece 4, and the stretching mechanism 9 can keep a certain tension F at the bending deformation stage and drive the workpiece 4 to move under the action of the rotary platform 6.
The method comprises the following specific implementation steps:
firstly, a workpiece 4 is placed on a pre-stretching device for stretching, and the device consists of a rotating platform 6, a stretching mechanism moving slide block 7, a stretching mechanism fixing device 8, a stretching mechanism 9, a clamping device 10 and a rotating platform fixing device 11 which are symmetrically distributed on two sides of a frame 5.
The position of the first bending roll 1 is adjusted to enable a workpiece 4 to pass through the first bending roll 1 and the second bending roll 2, a gap between the third bending rolls 3 is reserved, two ends of the workpiece 4 are clamped by clamping devices 10, the clamping devices 10 can adjust the section size to meet the clamping requirements of workpieces of different sizes, the clamping devices 10 are connected with stretching mechanisms 9, the stretching mechanisms 9 are driven by hydraulic pressure, the stretching force can be adjusted according to the material performance of the workpiece, the section size and the like, the stretching mechanisms 9 are fixed on the moving sliding blocks 7 through fixing devices 8, the moving sliding blocks 7 can drive the stretching mechanisms 9 to move in the horizontal direction, and the stretching requirements of workpieces of different lengths are met. The stress sensor can detect the tensile deformation state of the workpiece in real time, and the workpiece stops being continuously stretched when reaching the yield state.
And after the pre-stretching is finished, bending and deforming the workpiece. The position of the first bending roller 1 is adjusted to enable the first bending roller to contact the upper surface of the workpiece 4, the rotating speed and the pressure of the first bending roller 1, the second bending roller 2 and the third bending roller 3 are adjusted to carry out bending deformation on the workpiece, wherein the first bending roller 1 is driven by a lifting device to adjust the pressing amount in real time, so that the bending deformation of products with different curvatures is realized. Particularly, when the workpiece is bent, the stretching mechanism continuously keeps the tension on the workpiece, so that the section of the workpiece is in a tensile stress state, when the workpiece is bent, the stretching mechanism 9 is driven by the moving slide block 7 to horizontally move to realize real-time feeding of the workpiece, and in order to avoid cracking of the workpiece caused by severe deformation, the stretching mechanism 9 is driven by the rotating platform 6 to realize rotation around the central line of the rack 5.
Example 2
Based on the same inventive concept, the invention also provides a metal material bending method, which comprises the following steps:
arranging a bending mechanism on a frame 5, and adjusting the position of the bending mechanism to enable a workpiece 4 to pass through a gap between the bending mechanisms;
the frame 5 is rotationally connected with the stretching device through a rotating platform 6, so that the stretching device clamps and prestretches two ends of the metal material workpiece 4;
further, the bending mechanism bends the metal workpiece 4.
Example 3:
the invention provides a control system for metal material bending processing based on the same invention concept, which can realize on-line control and automatic production;
the control system 12 drives the hydraulic clamping device 10 and the pre-stretching device, drives the hydraulic clamping device 10 to clamp two ends of the workpiece 4, and enables the pre-stretching device to move in the horizontal direction, so as to meet the stretching requirements of the workpieces 4 with different length and size, and comprises:
a stretching mechanism 9 of the pre-stretching device is fixed on the moving slide block 7 of the stretching mechanism through a fixing device 8 of the stretching mechanism;
the hydraulic clamping device 10 on the stretching mechanism 9 is driven by the control system 12 to move along the horizontal direction of the rotating platform 6, so that the stretching mechanism 9 continuously keeps the tension F on the workpiece 4 while the workpiece 4 is bent and deformed;
the length of the stretching mechanism 9 is less than the length of the rotating platform 6.
The cross section of the workpiece 4 is completely in a tensile stress state.
Example 4:
in order to better illustrate the advantages and effects of the roll bending forming method provided by the invention in the aspect of controlling the springback and wrinkle defects of products, a finite element simulation calculation means is adopted to carry out bending simulation on a typical bent section, and fig. 3 shows the shape and the size of the section, the sectional dimension is 50 multiplied by 50mm, the wall thickness of the section is 3mm, and the length is 1180 mm.
Fig. 5 is a statistical result of the maximum bending stress of the inner side of the profile with different bending radii, and it can be seen that, compared with the conventional bending process, the bending process provided by the present invention can effectively reduce the compressive stress, thereby improving the problems of wrinkles and waves on the inner side of the profile, taking the profile with a bending radius of 300mm as an example, as shown in fig. 6, the maximum compressive stress of the inner side of the profile under the conventional bending process condition is 100Mpa, and the maximum compressive stress of the inner side of the profile is reduced to 58Mpa by the process of the present invention.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and those skilled in the art will appreciate that various modifications and changes can be made to the present invention. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present invention is included in the scope of the claims of the present invention filed as filed.
Claims (12)
1. A metal material bending apparatus, comprising: the bending mechanism, the rotating platform (6), the frame (5) and the stretching device;
the bending mechanism is arranged at the upper part of the frame (5);
the rotary platform (6) and the stretching device are both of a symmetrical structure, and the rotary platform (6) is arranged on two sides of the rack (5); the stretching device is arranged on the rotating platform (6);
a metal material workpiece (4) penetrates through the bending mechanism and is placed on the rack (5), and two ends of the metal material workpiece are respectively and fixedly connected to the stretching devices on two sides of the rack (5);
the stretching device provides a tensioning force for the metal material workpiece (4).
2. The apparatus of claim 1, wherein the stretching means comprises: a stretching mechanism (9);
the stretching mechanism (9) is driven by hydraulic pressure.
3. The apparatus of claim 2, wherein the stretching apparatus further comprises: a moving slide block (7), a fixing device (8) and a clamping device (10);
the fixing device (8) and the clamping device (10) are respectively arranged at two ends of the stretching mechanism (9); the fixing device (8) is arranged on the rotating platform (6) in a sliding manner through the moving slide block (7); the clamping device (10) is used for clamping the metal material workpiece (4);
wherein the length of the stretching mechanism (9) is less than the length of the rotating platform (6).
4. The device according to claim 3, characterized in that the rotary platform (6) is of a cylindrical structure and the moving slider (7) is of a square bottom grooved structure;
the groove structure is clamped on the rotating platform (6) and can horizontally slide along the rotating platform (6).
5. A device according to claim 3, characterized in that said fixing means (8) are in the form of a laid-down U;
the stretching structure (9) is fixed in a U-shaped clamping groove of the fixing device (8);
one side of the U-shaped clamping groove of the fixing device (8) is fixedly arranged on the moving slide block (7).
6. The apparatus of claim 1, further comprising: a stress sensor and a displacement sensor;
the stress sensor and the displacement sensor are respectively arranged on the stretching mechanism (9);
the stress sensor is used for monitoring the tensile deformation state of the metal material workpiece (4) in real time;
the displacement sensor is used for determining the horizontal displacement of the stretching mechanism (9) and the rotation angle of the rotating platform (6) by monitoring the length of the metal material workpiece (4).
7. The apparatus of claim 1, further comprising: two rotating platform fixing devices (11), rotating platform fixing devices (11) are arranged on two sides of the rack (5), and the rotating platform (6) is rotatably connected with the rotating platform fixing devices (11).
8. The apparatus of claim 1, wherein the bending mechanism comprises: a first bending roller (1), a second bending roller (2) and a third bending roller (3);
the metal material workpiece (4) passes through the bending mechanism.
9. A metallic material bending processing method characterized by processing a metallic material (4) using the metallic material bending processing apparatus according to any one of claims 1 to 8, the method comprising: arranging a bending mechanism on a rack (5), and adjusting the position of the bending mechanism to enable a metal material workpiece (4) to pass through gaps between the bending mechanisms;
the frame (5) is rotationally connected with the stretching device through the rotating platform (6), so that the stretching device clamps and prestretches two ends of the metal material workpiece (4);
further, the bending mechanism bends the metal workpiece (4).
10. Method according to claim 9, characterized in that the frame (5) is rotatably connected to the stretching device by means of a rotating platform (6) so that the stretching device tightens and prestretches both ends of the piece (4) of metallic material, comprising:
a stretching mechanism (9) of the stretching device is fixed on the moving slide block (7) through a fixing device (8);
moving a clamping device (10) on a stretching mechanism (9) along the horizontal direction of a rotating platform (6), so that the stretching mechanism (9) continuously keeps the tension (F) on the metal material workpiece (4) while the metal material workpiece (4) is bent and deformed;
the cross section of the metal material workpiece (4) is completely in a tensile stress state.
11. A control system for bending metal material is characterized in that: the control system (12) comprises:
a metal material bending apparatus according to any one of claims 1 to 9, and an upper computer connected to said metal material bending apparatus, said upper computer including:
the adjusting module is used for adjusting the position of the bending mechanisms so that the metal material workpiece (4) can pass through gaps among the bending mechanisms;
the control module is used for controlling the rotary platform (6) and the stretching device rotationally connected with the rack (5) so that the stretching device clamps and prestretches two ends of the metal material workpiece (4);
the bending module is used for bending the metal material workpiece (4).
12. The system of claim 11, wherein the control module comprises:
the clamping control unit is used for controlling two ends of the metal material workpiece (4) so that the clamping control unit moves along the horizontal direction of the rotating platform (6);
the control module further comprises:
a stretching control unit for controlling to continuously maintain the stretching of the metallic material workpiece (4) while the metallic material workpiece (4) is bent and deformed.
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|---|---|---|---|
| CN201911009552.8A CN111299377A (en) | 2019-10-23 | 2019-10-23 | Metal material bending device and method |
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| CN201911009552.8A CN111299377A (en) | 2019-10-23 | 2019-10-23 | Metal material bending device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113617903A (en) * | 2021-06-15 | 2021-11-09 | 浙江大学 | Hot bending forming device suitable for multi-size rectangular pipes |
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| CN113617903B (en) * | 2021-06-15 | 2022-06-10 | 浙江大学 | Hot bending forming device suitable for multi-size rectangular pipes |
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