阅读说明：本技术 一种反复多层卷弯强变形模具及其使用方法 (Repeated multi-layer bending strong deformation die and use method thereof ) 是由 顾勇飞 李彦贤 骆俊廷 刘亮 张丽丽 张春祥 于 2020-06-10 设计创作，主要内容包括：本发明公开一种反复多层卷弯强变形模具及其使用方法,包括夹头和卷辊,夹头内设有矩形槽一,板材的一端固定在矩形槽一内；卷辊的外周平行于轴线开设有矩形槽二,板材的另一端固定在矩形槽二内。首先用夹头将板材一端固定,板材的另一端固定在卷辊上,夹头提供拉力将板材拉直。卷弯时卷辊先正向旋转,板材发生弯曲塑性变形覆盖在卷辊上。当板材正向卷弯完成时,卷辊反向旋转,同时夹头提供拉力,将板材展开,展开后卷辊继续旋转,使板材反向卷弯塑性变形。正向卷弯与反向卷弯为一个道次,重复上述动作,直到将板材反复卷弯到规定道次。通过反复多层弯曲,本发明可以实现整个板材的大应变量变形,从而有效细化晶粒,提高板材力学性能。(The invention discloses a repeated multi-layer bending strong deformation die and a using method thereof, wherein the die comprises a chuck and a winding roller, a first rectangular groove is formed in the chuck, and one end of a plate is fixed in the first rectangular groove; the periphery of the winding roller is parallel to the axis and is provided with a second rectangular groove, and the other end of the plate is fixed in the second rectangular groove. Firstly, one end of the plate is fixed by a chuck, the other end of the plate is fixed on a roller, and the chuck provides a pulling force to straighten the plate. When in bending, the winding roller rotates forwards, and the plate is covered on the winding roller after being bent and plastically deformed. When the forward bending of the plate is finished, the winding roller rotates reversely, meanwhile, the chuck provides tension to unwind the plate, and the winding roller continues to rotate after unwinding, so that the plate is subjected to reverse bending plastic deformation. And the forward bending and the reverse bending are performed in one pass, and the actions are repeated until the plate is reversely bent to a specified pass. Through repeated multilayer bending, the invention can realize large-strain deformation of the whole plate, thereby effectively refining crystal grains and improving the mechanical property of the plate.)

1. The utility model provides a mould is warp by force to relapse multilayer book bending which characterized in that: the winding device comprises a chuck and a winding roller, wherein a first rectangular groove is formed in the chuck, and one end of a plate is fixed in the first rectangular groove; the periphery of the winding roller is provided with a rectangular groove II parallel to the axis, and the other end of the plate is fixed in the rectangular groove II; the winding roller can rotate positively and negatively, and when the winding roller rotates, the plate is bent and coated on the peripheral surface of the winding roller.

2. The repeated multi-layer roll bending strong deformation mold according to claim 1, wherein: the height of the first rectangular groove is the same as the thickness of the plate.

3. The repeated multi-layer roll bending strong deformation mold according to claim 1, wherein: the specification of the second rectangular groove is the same as that of the first rectangular groove, and the height of the second rectangular groove is the same as the thickness of the plate.

4. The repeated multi-layer roll bending strong deformation mold according to claim 1, wherein: the chuck moves in a horizontal direction.

5. The repeated multi-layer roll bending strong deformation mold according to claim 1, wherein: the diameter of the winding roller depends on the material yield strength and the thickness of the plate, and the diameter calculation formula of the winding roller is as follows:

φ＝0.2σ×t，

wherein phi is the diameter of the winding roll, sigma is the yield strength of the material, and t is the thickness of the plate.

6. The use method of the repeated multi-layer roll bending strong deformation die is applied to the repeated multi-layer roll bending strong deformation die in any one of claims 1 to 5, and is characterized by comprising the following steps:

(1) fixing one end of a plate by using a chuck, fixing the other end of the plate on a winding roller, and straightening the plate by providing a pulling force by using the chuck;

(2) the winding roller rotates forwards, and the plate is bent and plastically deformed to cover the outer peripheral surface of the winding roller;

(3) when the plate is bent in the forward direction, the winding roller rotates in the reverse direction, meanwhile, the chuck provides tension to unwind the plate, and the winding roller continues to rotate after unwinding, so that the plate is bent in the reverse direction and covered on the outer peripheral surface of the winding roller in a plastic deformation manner;

(4) and (4) repeating the steps (2) to (3) until the plate is reversely bent to the specified requirement.

7. The use method of the repeated multi-layer roll bending strong deformation die according to claim 6, characterized in that: one operation from the forward rotation bending in the step (2) to the reverse rotation bending in the step (3) is one pass.

8. The use method of the repeated multi-layer roll bending strong deformation die according to claim 7, is characterized in that: in the step (4), the steps (2) to (3) are repeated until the plate is reversely bent to a specified pass.

Technical Field

The invention relates to the technical field of bending deformation of metal plates, in particular to a repeated multi-layer bending strong deformation die and a using method thereof.

Background

The bending is a press working method in which a plate placed in a bending die is pressed by a die to cause local plastic flow, thereby obtaining a shape corresponding to the die. The common bending only locally deforms the plate, the deformation is small, the work hardening effect of the plate is small, the high-strength metal plate is difficult to prepare, and the application range of the high-strength metal plate is limited.

Disclosure of Invention

The invention aims to provide a repeated multi-layer bending strong deformation die and a using method thereof, which are used for solving the problems in the prior art, and the repeated multi-layer bending can realize large-strain deformation of the whole plate, thereby effectively refining crystal grains and improving the mechanical property of the plate.

In order to achieve the purpose, the invention provides the following scheme: the invention provides a repeated multi-layer bending strong deformation die which comprises a chuck and a winding roller, wherein a first rectangular groove is formed in the chuck, and one end of a plate is fixed in the first rectangular groove; the periphery of the winding roller is provided with a rectangular groove II parallel to the axis, and the other end of the plate is fixed in the rectangular groove II; the winding roller can rotate positively and negatively, and when the winding roller rotates, the plate is bent and coated on the peripheral surface of the winding roller.

Preferably, the height of the first rectangular groove is the same as the thickness of the plate.

Preferably, the second rectangular groove has the same specification as the first rectangular groove, and the height of the second rectangular groove is the same as the thickness of the plate.

Preferably, the collet moves in a horizontal direction.

Preferably, the diameter of the winding roller depends on the material yield strength and the thickness of the plate, and the diameter of the winding roller is calculated by the following formula:

φ＝0.2σ×t

wherein phi is the diameter of the winding roll, sigma is the yield strength of the material, and t is the thickness of the plate.

The invention also provides a use method of the repeated multilayer roll bending strong deformation die, which is applied to the repeated multilayer roll bending strong deformation die and comprises the following steps:

(1) fixing one end of a plate by using a chuck, fixing the other end of the plate on a winding roller, and straightening the plate by providing a pulling force by using the chuck;

(2) the winding roller rotates forwards, and the plate is bent and plastically deformed to cover the outer peripheral surface of the winding roller;

(3) when the plate is bent in the forward direction, the winding roller rotates in the reverse direction, meanwhile, the chuck provides tension to unwind the plate, and the winding roller continues to rotate after unwinding, so that the plate is bent in the reverse direction and covered on the outer peripheral surface of the winding roller in a plastic deformation manner;

(4) and (4) repeating the steps (2) to (3) until the plate is reversely bent to the specified requirement.

Preferably, one operation from the forward-rotation bending in the step (2) to the reverse-rotation bending in the step (3) is one pass.

Preferably, in the step (4), the steps (2) to (3) are repeated until the plate is reversely bent to a specified pass.

Compared with the prior art, the invention has the following technical effects:

the repeated multi-layer bending strong deformation die and the use method thereof provided by the invention realize the repeated multi-layer bending strong deformation of the plate through the matching of the winding roller and the chuck, and the reverse bending can accumulate a large amount of strain on the plate, can refine material crystal grains and improve the mechanical property of the material.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed 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 to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram showing the positions of a plate, a chuck and a mold when the plate, the chuck and the mold are not deformed in the present invention;

FIG. 2 is a schematic diagram showing the positions of the plate, the collet and the mold at the end of forward bending in the present invention;

FIG. 3 is a schematic diagram showing the positions of the plate, the clamping head and the mold at the end of the backward bending in the present invention;

wherein, 1, winding roller; 2, plates; 3, clamping the head.

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.

The invention aims to provide a repeated multi-layer bending strong deformation die and a using method thereof, which are used for solving the problems in the prior art, and the repeated multi-layer bending can realize large-strain deformation of the whole plate, thereby effectively refining crystal grains and improving the mechanical property of the plate.

The invention provides a repeated multi-layer bending strong deformation die which comprises a chuck and a winding roller, wherein a first rectangular groove is formed in the chuck, and one end of a plate is fixed in the first rectangular groove; the periphery of the winding roller is parallel to the axis and is provided with a rectangular groove II, and the other end of the plate is fixed in the rectangular groove II; the winding roller can rotate positively and negatively, and when the winding roller rotates, the plate is bent and coated on the peripheral surface of the winding roller.

Firstly, one end of the plate is fixed by a chuck, the other end of the plate is fixed on a roller, and the chuck provides a pulling force to straighten the plate. When in bending, the winding roller rotates forwards, and the plate is covered on the winding roller after being bent and plastically deformed. When the forward bending of the plate is finished, the winding roller rotates reversely, meanwhile, the chuck provides tension to unwind the plate, and the winding roller continues to rotate after unwinding, so that the plate is subjected to reverse bending plastic deformation. And the forward bending and the reverse bending are performed in one pass, and the actions are repeated until the plate is reversely bent to a specified pass.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 1-3, the invention provides a repeated multi-layer bending strong deformation die, which comprises a chuck 3 and a winding roller 1, wherein a first rectangular groove is formed in the chuck 3, and one end of a plate 2 is fixed in the first rectangular groove; the periphery of the winding roller 1 is provided with a rectangular groove II parallel to the axis, and the other end of the plate 2 is fixed in the rectangular groove II; the winding roller 1 is rotatable forward and backward, and when the winding roller 1 rotates, the sheet material 2 is bent and wrapped around the outer peripheral surface of the winding roller 1.

In order to enable the two ends of the plate to be matched and fixed on the chuck 3 and the winding roller 1, the height of the first rectangular groove on the chuck 3 is the same as the thickness of the plate, and the specification of the second rectangular groove in the winding roller 1 is the same as that of the first rectangular groove, namely the height of the second rectangular groove is also the same as the thickness of the plate.

Different metal materials have different plastic deformation capacities, the plate thickness influences the bending radius, the diameter of the winding roller 1 can be determined by an empirical formula, the diameter of the winding roller 1 depends on the material yield strength of the plate 2 and the thickness of the plate 2, and the diameter calculation formula of the winding roller 1 is as follows:

φ＝0.2σ×t

wherein phi is the diameter of the winding roll 1, sigma is the yield strength of the material, and t is the thickness of the plate 2.

The application method of the repeated multi-layer bending strong deformation mold comprises the following steps:

(1) fixing one end of the plate 2 by using a chuck 3, fixing the other end of the plate 2 on a winding roller 1, and straightening the plate 2 by providing a pulling force by using the chuck 3;

(2) the winding roller 1 rotates forwards, and the plate 2 is bent and plastically deformed to cover the outer peripheral surface of the winding roller 1;

(3) when the plate 2 is bent in the forward direction, the winding roller 1 is rotated in the reverse direction, meanwhile, the chuck 3 provides tension to unwind the plate 2, and the winding roller 1 continues to rotate after unwinding, so that the plate 2 is bent in the reverse direction and is covered on the peripheral surface of the winding roller 1 in a plastic deformation manner;

(4) and (3) repeating the steps (2) - (3) for one pass from the forward rotating bending in the step (2) to the reverse rotating bending in the step (3) until the plate 2 is reversely bent to the specified pass.