CN110961499B - Working surface molded line of U-shaped forming machine die and generation method thereof - Google Patents

Working surface molded line of U-shaped forming machine die and generation method thereof Download PDF

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CN110961499B
CN110961499B CN201811141667.8A CN201811141667A CN110961499B CN 110961499 B CN110961499 B CN 110961499B CN 201811141667 A CN201811141667 A CN 201811141667A CN 110961499 B CN110961499 B CN 110961499B
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line
base circle
section
center
forming machine
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CN110961499A (en
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李新文
王啸修
郭运
谢仕强
郭胜
吴毅文
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0209—Tools therefor

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Abstract

The invention discloses a working surface molded line of a U-shaped forming machine die, which is symmetrical about a central line, wherein the molded line positioned on one side of the central line comprises an involute section and an arc section, and the involute section is smoothly connected with the arc section. The invention also discloses a method for generating the working surface profile of the U-shaped forming machine die. By adopting the working surface profile of the die of the U-shaped forming machine, the die can finish U-shaped forming of the thin steel plate at one time.

Description

Working surface molded line of U-shaped forming machine die and generation method thereof
Technical Field
The invention relates to the field of steel pipe manufacturing, in particular to a profile of a working surface of a U-shaped forming machine die and a generating method thereof.
Background
The longitudinal submerged arc welded pipe is a welded pipe made of steel plates through different forming processes and is divided into UOE, JCOE, RBE, CFE, PFE and the like according to a forming mode. The UOE forming method comprises the steps of firstly pressing a pre-bent steel plate into a U shape in a forming die of a U forming machine, then pressing the steel plate into an O shape in the forming die of the O forming machine, welding the steel plate into a pipe blank, then expanding the pipe blank integrally, and finally performing water pressure, nondestructive inspection and chamfering to obtain a finished pipe.
Fig. 1 is an ideal state diagram of a U-shaped forming machine pressing a pre-crimped steel plate into a U-shaped tube 6. The sidewall depression H of the U-shaped cylinder 6 should be less than a target value, typically 15 mm; and the width W of the U-shaped cylinder 6 should be as close as possible to the nominal diameter of the finished tube. However, the working surface profile of the existing U-shaped forming machine die is circular, when a thin-walled steel tube needs to be produced, the problems that the side wall depression H of the U-shaped cylinder 6 exceeds the standard, the surface of the steel plate has indentation, out-of-roundness exceeds the standard and the like can occur, and the U-shaped forming process needs to be repeated for many times.
Aiming at the problems in the prior art, the provision of a new working surface profile of the die of the U-shaped forming machine is of great significance.
Disclosure of Invention
In order to solve the problems, the invention provides a working surface profile of a die of a U-shaped forming machine, which can enable the die to finish U-shaped forming of a thin steel plate at one time.
In order to achieve the purpose, the molded line of the working surface of the die of the U-shaped forming machine is symmetrical about a central line, the molded line positioned on one side of the central line comprises a gradually-opened line section and an arc section, and the gradually-opened line section is smoothly connected with the arc section.
Preferably, a rectangular coordinate system is established with the center of the base circle as the origin, and the equation of the prototype of the involute segment is:
Figure BDA0001815946820000021
θ∈[θ1，θ2]，
wherein R isbTheta is the included angle between the connecting line of the tangent point of the base circle and the center of the base circle and the x axis, and theta is the included angle between the normal line of any point on the involute section and the x axis1The normal of the starting point on the involute section is tangent to the included angle between the connecting line of the tangent point of the base circle and the circle center of the base circle and the x axis, theta2The normal of the end point on the involute section is tangent to the included angle between the connecting line of the tangent point of the base circle and the center of the base circle and the x axis;
Figure BDA0001815946820000022
Figure BDA0001815946820000023
Figure BDA0001815946820000024
wherein D isnIs the nominal diameter of the finished tube;
the circular arc section is smoothly connected with the starting point of the gradually-opened line section, the central angle alpha of the circular arc section is 45 degrees, and the radius of the circular arc section
Figure BDA0001815946820000025
The invention discloses a method for generating a working surface profile of a U-shaped forming machine die, which comprises the following steps:
s1, generating a prototype of the gradual-open line segment according to the equation of the prototype of the gradual-open line segment;
s2, rotating the prototype of the gradually-opened line segment around the center of the base circle by theta clockwise2Generating the arc segment from the starting point of the gradually-opening segment to form a molded line positioned on the left side of the central line;
and S3, obtaining a molded line positioned on the right side of the central line according to the symmetry principle, and generating the whole molded line.
The bottom of the working surface profile of the U-shaped forming machine die is in an involute form, so that the steel sheet is in a circular arc shape at the bottom of a U-shaped cylinder obtained by pressing the steel sheet in the U-shaped forming machine die, and the out-of-roundness is ensured to reach the standard; meanwhile, the adoption of the arc section with the radius of R can ensure that the thin steel plate is easy to generate plastic deformation at two points A, D, and ensure that the side wall depression H of the U-shaped cylinder is less than 15 mm.
Drawings
FIG. 1 is an ideal state diagram of a U-shaped tube pressed by a U-shaped forming machine;
FIG. 2 is a schematic view of the face profile of the U-shaped forming machine die of the present invention;
FIG. 3 is a diagram of a prototype of the involute segment AB of the present invention;
fig. 4 is a U-forming process of a U-former die using the inventive face profile.
Detailed Description
The structure, operation, and the like of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 2, the profile of the working surface of the U-shaped forming machine die of the present invention is symmetrical about the center line BF, the profile on one side of the center line BF includes an involute section BA and an arc section AC, the involute section BA and the arc section AC are smoothly connected, i.e., the curvature radius at the intersection point a is the same; correspondingly, the molded line on the other side of the center line BF includes an involute segment BD and an arc segment DE, and the involute segment BD and the arc segment DE are smoothly connected, i.e., the curvature radius at the intersection point D is the same.
Referring to fig. 3, a rectangular coordinate system is established with the center O of the base circle as the origin, and the equation of the prototype of the involute segment BA is:
Figure BDA0001815946820000041
θ∈[θ1，θ2]，
wherein R isbTheta is the included angle between the line connecting the tangent point of the base circle and the center O of the base circle and the x axis, and theta is the radius of the base circle1The normal line of the starting point A on the involute section BA is tangent to the included angle between the connecting line OG of the tangent point G of the base circle and the center O of the base circle and the x axis2The included angle between the connecting line OF OF the tangent point F OF the base circle and the center O OF the base circle and the axis x is the normal OF the end point B on the involute section BA;
Figure BDA0001815946820000042
Figure BDA0001815946820000043
Figure BDA0001815946820000044
wherein D isnIs the nominal diameter of the finished tube;
the arc section AC is smoothly connected with the starting point A of the involute section BA, and the center of the circle of the arc section ACAngle alpha is 45 degrees, radius of arc segment AC
Figure BDA0001815946820000045
Referring to fig. 2 in combination with fig. 3, the method for generating the working surface profile of the U-shaped forming machine mold includes the following steps:
s1, generating a prototype of the gradual-open line segment BA according to the equation of the prototype of the gradual-open line segment BA;
s2, rotating the prototype of the gradually-opening line segment BA clockwise by theta around the center O of the base circle2Starting from a starting point A of the involute section BA, generating an arc section AC to form a molded line positioned on the left side of a central line BF;
and S3, obtaining a molded line (including a gradually-opened line segment BD and an arc segment DE) positioned on the right side of the central line BF according to the symmetry principle, and generating a molded line of the working surface of the whole U-shaped forming machine mold.
The U forming process of the U forming machine die adopting the working surface molded line comprises the following steps: as shown in fig. 4a, the pre-flanged steel plate 3 is transferred to the U-forming machine and stops on the lateral gantry 4 of the U-forming machine; as shown in fig. 4b, the movable beam 1 carries the die 2 to move downwards until the steel plate 3 is clamped between the die 2 and the middle roller 5, and the steel plate 3 is clamped between the die 2 and the middle roller 5 and is pressed downwards by the die 2 until the die 2 moves to a set target value; as shown in fig. 4c, the both side gantries 4 move toward the center line direction until reaching the set target positions of the side gantries 4; finally, as shown in fig. 4d, the lateral rack 4 is reset, the movable beam 1 drives the mold 2 to ascend, the middle roller table 5 supports the formed U-shaped cylinder to ascend, and the U-shaped cylinder is moved out of the U-shaped forming machine, so that the U-shaped forming process is completed. Wherein, during the U forming process, the maximum acting force of the lateral racks 4 on the steel plate on the two sides respectively acts at A, D points.
The U forming machine die of the working surface profile can finish the U forming of the thin steel plate at one time, the bottom of the working surface profile adopts an involute form, the thin steel plate is favorably in a circular arc shape at the bottom of a U-shaped cylinder obtained by pressing the thin steel plate by the U forming machine die, and the out-of-roundness is ensured to reach the standard; meanwhile, the adoption of the arc section with the radius of R can ensure that the thin steel plate is easy to generate plastic deformation at two points A, D, and ensure that the side wall depression H of the U-shaped cylinder is less than 15 mm.
The foregoing is merely illustrative of the present invention, and it will be appreciated by those skilled in the art that various modifications may be made without departing from the principles of the invention, and the scope of the invention is to be determined accordingly.

Claims (2)

1. The working surface molded line of the U-shaped forming machine die is characterized in that the molded line is symmetrical about a central line, the molded line positioned on one side of the central line comprises an involute section and an arc section, and the involute section is smoothly connected with the arc section;
and establishing a rectangular coordinate system by taking the center of the base circle as an origin, wherein the equation of the prototype of the gradually-opened line segment is as follows:
Figure FDA0002941587850000011
θ∈[θ1，θ2]，
wherein R isbTheta is the included angle between the connecting line of the tangent point of the base circle and the center of the base circle and the x axis, and theta is the included angle between the normal line of any point on the involute section and the x axis1The normal of the starting point on the involute section is tangent to the included angle between the connecting line of the tangent point of the base circle and the center of the base circle and the x axis, theta2The normal of the end point on the involute section is tangent to the included angle between the connecting line of the tangent point of the base circle and the center of the base circle and the x axis;
Figure FDA0002941587850000012
Figure FDA0002941587850000013
Figure FDA0002941587850000014
wherein D isnIs the nominal diameter of the finished tube;
the circular arc section is smoothly connected with the starting point of the gradually-opened line section, the central angle alpha of the circular arc section is 45 degrees, and the radius of the circular arc section
Figure FDA0002941587850000015
2. The method of forming a face profile for a U-shape machine die of claim 1 including the steps of:
s1, generating a prototype of the gradual-open line segment according to the equation of the prototype of the gradual-open line segment;
s2, rotating the prototype of the gradually-opened line segment around the center of the base circle by theta clockwise2Generating the arc segment from the starting point of the gradually-opening segment to form a molded line positioned on the left side of the central line;
and S3, obtaining a molded line positioned on the right side of the central line according to the symmetry principle, and generating the whole molded line.
CN201811141667.8A 2018-09-28 2018-09-28 Working surface molded line of U-shaped forming machine die and generation method thereof Active CN110961499B (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911709A (en) * 1973-10-17 1975-10-14 Mannesmann Ag Bending the edges of sheet or plate stock
CN86107514A (en) * 1985-12-28 1987-07-08 株式会社中田制作所 Format roll in the tuber, forming method and equipment thereof
JPH09192749A (en) * 1996-01-10 1997-07-29 Nakata Seisakusho:Kk Break down roll device in tube mill
CN101428319A (en) * 2008-12-14 2009-05-13 天水锻压机床有限公司 Pre-bend mould
CN201342451Y (en) * 2008-12-14 2009-11-11 天水锻压机床有限公司 Die of steel tube reeling straightening machine
CN202006238U (en) * 2011-02-22 2011-10-12 宝山钢铁股份有限公司 Mould for pre-flanging machine
CN202591379U (en) * 2012-03-23 2012-12-12 宝山钢铁股份有限公司 Pre-flanging machine die
CN106132577A (en) * 2014-03-31 2016-11-16 杰富意钢铁株式会社 Bending and stamping mould

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911709A (en) * 1973-10-17 1975-10-14 Mannesmann Ag Bending the edges of sheet or plate stock
CN86107514A (en) * 1985-12-28 1987-07-08 株式会社中田制作所 Format roll in the tuber, forming method and equipment thereof
JPH09192749A (en) * 1996-01-10 1997-07-29 Nakata Seisakusho:Kk Break down roll device in tube mill
CN101428319A (en) * 2008-12-14 2009-05-13 天水锻压机床有限公司 Pre-bend mould
CN201342451Y (en) * 2008-12-14 2009-11-11 天水锻压机床有限公司 Die of steel tube reeling straightening machine
CN202006238U (en) * 2011-02-22 2011-10-12 宝山钢铁股份有限公司 Mould for pre-flanging machine
CN202591379U (en) * 2012-03-23 2012-12-12 宝山钢铁股份有限公司 Pre-flanging machine die
CN106132577A (en) * 2014-03-31 2016-11-16 杰富意钢铁株式会社 Bending and stamping mould

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
基于曲线匹配的模具轮廓曲线方程求解模型;李新文;《宝钢技术》;20170615(第03期);全文 *

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