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Design method for in-plane bend-formed roller molded surface

A technology of forming rolls and design methods, applied in metal rolling and other directions, can solve the problems of uneven thickness and circumferential directions of strips, difficulty in coordination of deformation, and difficulty in precise control of large width and expansion.

Active Publication Date: 2016-08-17
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the problems existing in the existing methods, such as the difficulty in coordinating the uneven deformation of the strip in the thickness direction and the circumferential direction, it is difficult to form a ring with a small bending radius, and it is easy to produce defects such as wrinkles and twists, and the width is too large to be accurately controlled. Invention Proposes a Design Method for Roll Profiles Used in In-Plane Bending Forming

Method used

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  • Design method for in-plane bend-formed roller molded surface
  • Design method for in-plane bend-formed roller molded surface
  • Design method for in-plane bend-formed roller molded surface

Examples

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Embodiment 1

[0113] This embodiment is a method for designing the profile of a roll for in-plane bending. In this example, the workpiece to be formed is selected from 3A21O aluminum alloy, and the initial plate width b 0 is 20mm, the initial plate thickness t 0 2.0mm. During forming, the rotational speed of the rolls is set at 40 rpm; the angle between the end faces of the two rolls 4 is the roll wedge angle β; the position where the strip 5 is put into the wedge-shaped roll gap is the discharge position 6, that is, z 0 ,z 0 It is defined as the distance from the intersection of the b-end of the strip 5 in the wedge-shaped roll gap and the x-axis to the intersection of a pair of roll axes, such as Figure 5 shown. The discharge position 6 is set to z 0 = 5mm, the strip is in a critically depressed state, that is, the plate thickness at end b is the initial plate thickness t 0 , the plate thickness at end a is t 1 , so the relative thickness of the strip is t 1 / t 0 = 0.20. For co...

Embodiment 2

[0167] This embodiment is a method for designing the profile of a roll for in-plane bending. In this example, the workpiece to be formed is selected from 3A21O aluminum alloy, and the initial plate width b 0 is 20mm, the initial plate thickness t 0 2.0mm. During forming, the rotational speed of the rolls is set at 40 rpm; the angle between the end faces of the two rolls 4 is the roll wedge angle β; the position where the strip 5 is put into the wedge-shaped roll gap is the discharge position 6, that is, z 0 ,z 0 It is defined as the distance from the intersection of the b-end of the strip 5 in the wedge-shaped roll gap and the x-axis to the intersection of a pair of roll axes, such as Figure 5 shown. The discharge position 6 is set to z 0 = 20mm, the strip is in the state of critical compression, that is, the plate thickness at end b is the initial plate thickness t 0 , the plate thickness at end a is t 1 , so the relative thickness of the strip is t 1 / t 0 = 0.50. ...

Embodiment 3

[0225] This embodiment is a method for designing the profile of a roll for in-plane bending. In this example, the workpiece to be formed is selected from 3A21O aluminum alloy, and the initial plate width b 0 is 20mm, the initial plate thickness t 0 2.0mm. During forming, the rotational speed of the rolls is set at 40 rpm; the angle between the end faces of the two rolls 4 is the roll wedge angle β; the position where the strip 5 is put into the wedge-shaped roll gap is the discharge position 6, that is, z 0 ,z 0 It is defined as the distance from the intersection of the b-end of the strip 5 in the wedge-shaped roll gap and the x-axis to the intersection of a pair of roll axes, such as Figure 5 shown. The discharge position 6 is set to z 0 = 30mm, the strip is in the state of critical compression, that is, the plate thickness at end b is the initial plate thickness t 0 , the plate thickness at end a is t 1 , so the relative thickness of the strip is t 1 / t 0 = 0.60. ...

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Abstract

The invention provides a design method for an in-plane bend-formed roller molded surface. In the aspect of facilitating coordination of the nonuniform deformation of plate strips, a function relationship between deformation parameters and rolling results is optimized, it is determined that the type of a roller with the inward bending limit of a nonuniform pressed surface being increased is a double-curve type, and the method for selection of the coefficient value m of a main face function and interception of the curve is provided. When a generatrix is used as a curved generatrix of the double-curve type for rolling the plate strips, the plate strips extend longitudinally in the plate width direction to be distributed linearly. In this way, compression deformation, consumed by deformation coordination, in the thickness direction is reduced or eliminated, and the extension ratio of strip elements on the outer edge and the inner edge of a deformation zone and the formation limit of the inward bending of the nonuniform pressed surfaces of the plate strips are increased. According to the design method for the in-plane bend-formed roller molded surface, the bending limit of the plate strips is increased, the risk of defect generation is lowered, the widthwise elongation is reduced, and thus accurate control over the formation is achieved.

Description

technical field [0001] The invention relates to the field of plastic processing, and relates to a design method for in-plane bending forming roll profiles. Background technique [0002] The in-plane bending forming technology of strip has a wide application value in the field of plastic processing of light flange products, profile bending parts, ring parts, etc. During the forming process, the material is in a three-dimensional compressive stress state in the deformation zone, which is conducive to the plasticity of the metal material, can fully tap the forming potential of the material, and greatly improves the forming limit. At present, for the manufacture of in-plane bending parts of the strip, the traditional plastic bending method and punching method are used. The stress state of the outer zone under tension and the inner zone under plastic bending can easily lead to cracking in the outer zone and wrinkling in the inner zone, making it difficult to form in-plane bendin...

Claims

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Application Information

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IPC IPC(8): B21H1/06B21H1/22
CPCB21H1/06B21H1/22
Inventor 李宏伟柯伟杨合任广义李云海
Owner NORTHWESTERN POLYTECHNICAL UNIV