CN116020920A - Bending method for bending piece - Google Patents
Bending method for bending piece Download PDFInfo
- Publication number
- CN116020920A CN116020920A CN202310301314.4A CN202310301314A CN116020920A CN 116020920 A CN116020920 A CN 116020920A CN 202310301314 A CN202310301314 A CN 202310301314A CN 116020920 A CN116020920 A CN 116020920A
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- bending
- piece
- bent
- center
- supporting blocks
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- 238000005452 bending Methods 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 33
- 125000006850 spacer group Chemical group 0.000 claims description 6
- 230000007306 turnover Effects 0.000 abstract description 3
- 239000000945 filler Substances 0.000 description 15
- 238000010586 diagram Methods 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention provides a bending forming method of a bending piece, which aims to ensure the accuracy of the bending center position of the bending piece in the bending forming process and improve the bending forming quality, and relates to the technical field of bending forming. The bending forming method of the bending piece comprises the steps of respectively placing two ends of the piece to be bent on two supporting blocks which can turn over in opposite directions and are provided with a bending forming cavity between the two supporting blocks, and adjusting the position of the piece to be bent to enable the theoretical bending center of the piece to be bent to coincide with the central line of a connecting line between the two supporting blocks; fixing the position of a piece to be bent; and stamping the piece to be bent from the theoretical bending center of the piece to be bent into the bending forming cavity by using a pressing die, so that the piece to be bent is bent to a required size, wherein in the bending process, when the offset of the actual bending center of the piece to be bent exceeds the requirement, the support block on the side of the offset of the actual bending center is raised, and then the piece to be bent is stamped from the theoretical bending center into the bending forming cavity by using a pressing film, so that the position of the actual bending center is adjusted.
Description
Technical Field
The invention relates to the technical field of bending forming, in particular to a bending forming method of a bending piece.
Background
The bending forming is a forming mode of bending a plate blank, a bar stock, a pipe or a section bar into a shape with a certain curvature and a certain angle, and in some special occasions, the requirement on the position accuracy of the bending center of a bending piece is higher. If the main pipeline hot section for the nuclear power station is provided, two integrated filler neck are located at two sides of the bending section, the included angle of the two integrated filler neck is 45 degrees, the distance from the bending section is different, the position and size error of the two integrated filler neck is required to be +/-1.5 mm, and one of the two integrated filler neck is close to the bending section and participates in bending deformation. Because of the existence of the integrated filler neck, the continuity and symmetry of bending deformation are damaged, the strength and plasticity of the tube blank are uneven, the stress conditions on two sides of the tube blank in the bending forming process are asymmetrical, and the bending center can deviate. The position size of the integrated filler neck after the deflection of the bending center can change, which can cause that the position size of the integrated filler neck is difficult to meet the design requirement, namely, the bending quality is difficult to be ensured. The forming mode of the bending piece is to compensate by adopting a mode of increasing the allowance of the nozzle before bending forming, but after the excircle size of the integrated nozzle is increased, the weight of the tube blank is greatly increased during forging, meanwhile, the forging forming difficulty of the integrated nozzle is increased, and for the integrated filler neck near the bending section, after the outer diameter of the nozzle is increased, the asymmetric phenomenon in the bending forming process is more obvious.
Disclosure of Invention
The invention aims to solve the technical problem of providing a bending forming method of a bending piece, so as to ensure the accuracy of the bending center position of the bending piece in the bending forming process and improve the bending forming quality.
The technical scheme adopted for solving the technical problems is as follows: a method of bending a curved member, comprising the steps of:
step one: respectively placing two ends of a piece to be bent on two supporting blocks which can turn over in opposite directions and are provided with a bending forming cavity between the two supporting blocks, and adjusting the position of the piece to be bent to enable the theoretical bending center of the piece to be bent to coincide with the central line of a connecting line between the two supporting blocks;
step two: fixedly connecting one end of a piece to be bent with a corresponding supporting block, and fixing the position of the piece to be bent;
step three: and stamping the piece to be bent from the theoretical bending center of the piece to be bent into the bending forming cavity by using a pressing die, so that the piece to be bent is bent to a required size, wherein when the offset of the actual bending center of the piece to be bent exceeds the requirement in the bending process, a supporting block on one side of the offset of the actual bending center is raised by using a cushion block, and then the piece to be bent is stamped from the theoretical bending center into the bending forming cavity by using the pressing die, so that the position of the actual bending center is adjusted until the position meets the requirement.
And in a new step, the supporting blocks are provided with positioning grooves matched with the outer Zhou Shi of the piece to be bent, and when the two ends of the piece to be bent are respectively placed on the two supporting blocks, the two ends of the piece to be bent are respectively clamped into the positioning grooves of the corresponding supporting blocks.
Further, the cushion block is a wedge block.
Further, in the third step, the support block on the side where the actual bending center is offset is raised by the spacer by an amount not exceeding the offset amount of the actual bending center.
The beneficial effects of the invention are as follows: according to the bending forming method of the bending piece, the piece to be bent is placed on the two supporting blocks capable of turning over in opposite directions, the supporting blocks can rotate along with the deformation of the piece to be bent, the piece to be bent can be bent from the theoretical bending center of the piece to be bent as much as possible during bending, and the deflection of the bending center in the bending process can be reduced. When the actual bending center in the bending forming process deviates from the theoretical requirement value due to poor continuity and symmetry and uneven strength and plasticity of the piece to be bent in the bending process, the supporting block on the side with the offset actual bending center is lifted to change the stress of the workpiece, so that the bending deformation point of the workpiece is offset towards the theoretical bending center, the position of the actual bending center is adjusted, and the method meets the requirements.
Drawings
FIG. 1 is a schematic diagram of a main pipe hot leg for a nuclear power plant;
FIG. 2 is a flow chart of the bending formation of the bending member of the present invention;
FIG. 3 is a schematic view of adjusting the bending center of a piece to be bent;
FIG. 4 is a schematic diagram of the structure of a pad;
reference numerals: 1-main pipeline hot section, 2-piece to be bent, 3-supporting block, 4-press die, 5-cushion block, 21-theoretical bending center, 22-actual bending center, 31-center line, 32-bending forming cavity and 33-turning shaft.
Detailed Description
The invention will be further described with reference to the drawings and examples.
As shown in fig. 1, in the main pipe hot segment 1 for a nuclear power plant, two integrated filler neck 12 are located at two sides of a bending segment 11, the included angle of the two integrated filler neck 12 is 45 degrees, the distance from the two integrated filler neck 12 to the bending segment 11 is different, the position and size error of the two integrated filler neck 12 is required to be +/-1.5 mm, and one filler neck is close to the bending segment and is involved in bending deformation. Because of the existence of the integrated filler neck, the continuity and symmetry of bending deformation are damaged, the strength and plasticity of the tube blank are uneven, the stress conditions on two sides of the tube blank are asymmetrical in the bending forming process, the bending center can deviate, and the position and the size of the integrated filler neck can be difficult to meet the design requirement. In order to ensure the accuracy of the bending center position of the bending piece in the bending forming process in the special occasions and ensure the bending forming quality, as shown in fig. 2 and 3, the bending forming method of the bending piece comprises the following steps:
step one: respectively placing two ends of a piece 2 to be bent on two supporting blocks 3 which can turn over in opposite directions and are provided with a bending forming cavity 32 between the two supporting blocks, and adjusting the position of the piece 2 to be bent to enable the theoretical bending center 21 of the piece 2 to be bent to coincide with the central line 31 of a connecting line between the two supporting blocks 3 (see figure 2);
step two: fixedly connecting one end of the piece 2 to be bent with the corresponding supporting block 3, and fixing the position of the piece 2 to be bent (see fig. 2);
step three: the pressing die 4 is used for pressing the to-be-bent piece 2 from the theoretical bending center 21 of the to-be-bent piece 2 into the bending forming cavity 32, so that the to-be-bent piece 2 is bent to a required size, wherein when the offset of the actual bending center 22 of the to-be-bent piece 2 exceeds the requirement in the bending process, the supporting block 3 on the offset side of the actual bending center 22 is lifted by the cushion block 5, and then the pressing die 4 is used for pressing the to-be-bent piece 2 from the theoretical bending center 21 into the bending forming cavity 32, so that the position of the actual bending center 22 is adjusted until the position meets the requirement.
According to the bending forming method of the bending piece, the piece 2 to be bent is placed on the two supporting blocks 3 which can be turned over in opposite directions, the supporting blocks 3 can rotate along with the deformation of the piece 2 to be bent, the piece 2 to be bent can be bent from the theoretical bending center 21 of the piece 2 to be bent as much as possible during bending, and the deflection of the bending center in the bending process can be reduced. When the actual bending center 22 in the bending forming process deviates from the theoretical requirement value due to poor continuity and symmetry and uneven strength and plasticity of the piece to be bent in the bending process of the bending piece, the supporting block 3 on the side, which is deviated from the actual bending center 22, is lifted, so that the stress of the workpiece is changed, and the bending deformation point of the workpiece deviates towards the theoretical bending center 21, thereby adjusting the position of the actual bending center 22 and ensuring that the actual bending center 22 meets the requirements. The method is simple and convenient.
In order to fix the piece 2 to be bent conveniently, the supporting blocks 3 are provided with positioning grooves matched with the outer Zhou Shi of the piece 2 to be bent, and when two ends of the piece 2 to be bent are respectively placed on the two supporting blocks 3, the two ends of the piece 2 to be bent are respectively clamped into the positioning grooves of the corresponding supporting blocks 3.
The amount of the raised support block 3 is determined according to the amount of the offset of the actual bending center 22 of the piece to be bent in the bending process, and the larger the offset of the actual bending center 22 is, the higher the raised support block 3 on the offset side is, and the offset of the actual bending center 22 is generally not exceeded. In order to facilitate the adjustment of the amount of lift of the support block 3 according to the amount of deflection of the actual bending center 22 of the piece to be bent during bending, the spacer block 5 is a wedge-shaped block as shown in fig. 4. The cushion block 5 is a wedge-shaped block, the thickness of the cushion block is gradually increased from one end to the other end, and different positions of the cushion block 5 are conveniently selected as supporting points according to requirements, so that the height of the cushion block 3 meets the requirements. In the embodiment of the present invention, as shown in fig. 3, the spacer 5 is arranged below the turning shaft 33 of the support block 3 to raise the support block 3, and the cross section of the spacer 5 is arranged in a crescent shape.
Claims (4)
1. The bending forming method of the bending piece is characterized by comprising the following steps of:
step one: the two ends of the piece (2) to be bent are respectively placed on two supporting blocks (3) which can be turned over in opposite directions and are provided with a bending forming cavity (32) between the two supporting blocks, and the position of the piece (2) to be bent is adjusted to enable the theoretical bending center (21) of the piece (2) to be bent to coincide with the central line (31) of a connecting line between the two supporting blocks (3);
step two: fixedly connecting one end of a piece (2) to be bent with a corresponding supporting block (3), and fixing the position of the piece (2) to be bent;
step three: and stamping the piece (2) to be bent from the theoretical bending center (21) of the piece (2) to be bent into the bending forming cavity (32) by using a pressing die (4), so that the piece (2) to be bent is bent to a required size, wherein when the offset of the actual bending center (22) of the piece (2) to be bent exceeds the requirement in the bending process, the supporting block (3) on the side, which is offset by the actual bending center (22), is lifted by using a cushion block (5), and then the piece (2) to be bent is stamped from the theoretical bending center (21) into the bending forming cavity (32) by using the pressing die (4) so as to adjust the position of the actual bending center (22) until the position meets the requirement.
2. The bending forming method of the bending piece according to claim 1, wherein the supporting blocks (3) are provided with positioning grooves matched with the outer sides Zhou Shi of the piece (2) to be bent, and when two ends of the piece (2) to be bent are respectively placed on the two supporting blocks (3), the two ends of the piece (2) to be bent are respectively clamped into the positioning grooves of the corresponding supporting blocks (3).
3. A bending method of a bending piece according to claim 1, characterized in that the spacer (5) is a wedge-shaped block.
4. A bending forming method of a bending member according to claim 1, wherein in the third step, the support block (3) on the side where the actual bending center (22) is offset is raised by a spacer (5) by an amount not exceeding the offset of the actual bending center (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310301314.4A CN116020920A (en) | 2023-03-27 | 2023-03-27 | Bending method for bending piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310301314.4A CN116020920A (en) | 2023-03-27 | 2023-03-27 | Bending method for bending piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116020920A true CN116020920A (en) | 2023-04-28 |
Family
ID=86072741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310301314.4A Pending CN116020920A (en) | 2023-03-27 | 2023-03-27 | Bending method for bending piece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116020920A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06519U (en) * | 1992-06-03 | 1994-01-11 | 水谷精工株式会社 | Bending machine |
| JPH08141655A (en) * | 1994-11-21 | 1996-06-04 | Amada Co Ltd | Method for bending and device therefor |
| JPH09164430A (en) * | 1995-12-14 | 1997-06-24 | Kawasaki Denki Kk | Electric wire bending device |
| JP2008149344A (en) * | 2006-12-15 | 2008-07-03 | Toyota Motor Corp | Device and method for bending tubular member |
| CN202114149U (en) * | 2011-05-31 | 2012-01-18 | 二重集团（德阳）重型装备股份有限公司 | Combined open type bending die |
| JP2012210650A (en) * | 2011-03-31 | 2012-11-01 | Komatsu Ltd | Bending device of steel plate, bending method and bending program |
| CN103350136A (en) * | 2013-07-15 | 2013-10-16 | 首帆动力设备制造(上海)有限公司 | Method using standard die to processing any circular arc |
| CN104028642A (en) * | 2014-07-06 | 2014-09-10 | 山西汾西重工有限责任公司 | Compression molding tool for asymmetric reducing oval streamline form medium aluminum plate surrounding shell |
| CN206763658U (en) * | 2017-04-18 | 2017-12-19 | 汉正检测技术有限公司 | A kind of bending apparatus |
| CN112588904A (en) * | 2020-11-27 | 2021-04-02 | 贵州航天新力科技有限公司 | Forge piece bending die and bending process |
-
2023
- 2023-03-27 CN CN202310301314.4A patent/CN116020920A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06519U (en) * | 1992-06-03 | 1994-01-11 | 水谷精工株式会社 | Bending machine |
| JPH08141655A (en) * | 1994-11-21 | 1996-06-04 | Amada Co Ltd | Method for bending and device therefor |
| JPH09164430A (en) * | 1995-12-14 | 1997-06-24 | Kawasaki Denki Kk | Electric wire bending device |
| JP2008149344A (en) * | 2006-12-15 | 2008-07-03 | Toyota Motor Corp | Device and method for bending tubular member |
| JP2012210650A (en) * | 2011-03-31 | 2012-11-01 | Komatsu Ltd | Bending device of steel plate, bending method and bending program |
| CN202114149U (en) * | 2011-05-31 | 2012-01-18 | 二重集团（德阳）重型装备股份有限公司 | Combined open type bending die |
| CN103350136A (en) * | 2013-07-15 | 2013-10-16 | 首帆动力设备制造(上海)有限公司 | Method using standard die to processing any circular arc |
| CN104028642A (en) * | 2014-07-06 | 2014-09-10 | 山西汾西重工有限责任公司 | Compression molding tool for asymmetric reducing oval streamline form medium aluminum plate surrounding shell |
| CN206763658U (en) * | 2017-04-18 | 2017-12-19 | 汉正检测技术有限公司 | A kind of bending apparatus |
| CN112588904A (en) * | 2020-11-27 | 2021-04-02 | 贵州航天新力科技有限公司 | Forge piece bending die and bending process |
Non-Patent Citations (1)
| Title |
|---|
| 郭延辉,吴转萍: "卡环弯曲工艺及模具设计", 模具工业, no. 03, pages 32 - 33 * |
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Application publication date: 20230428 |
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| RJ01 | Rejection of invention patent application after publication |