CN108543849B

CN108543849B - Forming method and equipment of magnesium alloy box-shaped part

Info

Publication number: CN108543849B
Application number: CN201810385090.9A
Authority: CN
Inventors: 王哲峰; 朴凤贤
Original assignee: Shenyang Aerospace University
Current assignee: Shenyang Aerospace University
Priority date: 2018-04-26
Filing date: 2018-04-26
Publication date: 2021-04-09
Anticipated expiration: 2038-04-26
Also published as: CN108543849A

Abstract

The invention discloses a forming method and equipment of a magnesium alloy box-shaped piece, wherein an AZ31 magnesium alloy plate with the thickness of 0.5-4mm is adopted as a blank in stamping forming; heating the blank (2), the male die (1) and the female die (4) to the specified temperature of 100 ℃ and 400 ℃ by using a heating ring (5), and then driving the male die (1) to move; the forming of the magnesium alloy integral box-shaped article (6) is completed by a press forming method of gradually and continuously forming by releasing the side part and the preferential corner part. The invention is suitable for stamping and forming the flange-free box-shaped part, does not need to increase equipment, has low investment and meets the requirements of various batch production.

Description

Forming method and equipment of magnesium alloy box-shaped part

Technical Field

The invention relates to a metal plastic processing technology, in particular to a method and equipment for forming a magnesium alloy box-shaped part.

Background

With the development of the times, the modern manufacturing trend is very obvious towards the direction of high strength and low weight, so that various novel materials are widely applied in various fields such as aerospace, high-speed trains, high-grade automobiles, military equipment, 3C consumer electronics and the like, and magnesium alloy is one of the materials. However, the problem of processing and forming magnesium alloy is always the key to the large-scale application of magnesium alloy. From the raw materials, China is a high-yield magnesium country, the production of cast magnesium alloy and wrought magnesium alloy has no technical obstacle, even the rolling technology of magnesium alloy is rapidly developed, magnesium alloy plates are originally rolled into wide plates by narrow plates with the width less than 200mm, the maximum width can reach 500mm, the thickness is 0.5-4mm, and the requirements of processing and forming such as stamping and the like can be completely met. However, the real magnesium alloy product is rarely seen in the market (the aluminum magnesium alloy in the market is a common aluminum alloy and is irrelevant to the magnesium alloy), and the magnesium alloy still serves as a sacrificial anode for corrosion prevention of ships at the maximum consumption at present, namely, the magnesium alloy is used once. The key to this situation is the lag in the process forming technique. Research on the forming of magnesium alloys has been ongoing for some time, and the problems have been focused on the problems of deep drawing of the box-shaped member and efficient and rapid production. The Hunan university makes a magnesium alloy stamping part with the thickness of 0.3mm, the drawing height is less than 5mm, and a magnesium alloy plate with the thickness of 0.3mm is adopted, so that the mass production capacity is not formed, and the strength is lower. In addition, magnesium alloys containing various rare earth elements have been proposed, which have been improved in punching properties, but have two problems: 1. the production of rare earth elements is limited in mass production; 2. after the components of the universal AZ31 magnesium alloy are changed, the subsequent existing mature anticorrosion and coating treatment technology needs to be researched again, and a large amount of manpower, material resources and time are consumed. We have developed a new press forming method by continuous forming step by step with edge portions and preferential corner portions released, by theoretical analysis and practical experiments, on the basis of the AZ31 magnesium alloy sheet having a thickness of 0.5 to 4mm, which is most commonly used in the market.

Disclosure of Invention

The invention aims to provide a novel method for gradually and continuously forming edges and preferential corners by releasing edges in order to overcome the defects of the traditional magnesium alloy stamping technology. The method is a continuous hot stamping forming method, and solves the technical problems of low processing precision, low forming rate and low yield caused by unreasonable process in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme: comprises the following components in sequence from top to bottom: the device comprises a male die (1), a cushion block (3), a female die (4) and a heating ring (5); the magnesium alloy blank (2) is arranged between the male die (1) and the cushion block (3).

A method for forming a magnesium alloy box-shaped piece comprises the following steps: heating the magnesium alloy blank (2), the male die (1) and the female die (4) to a specified temperature of 100-; the forming of the magnesium alloy integral box-shaped article (6) is completed by a press forming method of gradually and continuously forming by releasing the side part and the preferential corner part.

The magnesium alloy blank (2) is a magnesium alloy plate with the thickness of 0.5-4 mm.

The invention has the beneficial effects that:

the forming mechanism of the invention is relatively complex, namely the traditional box-shaped piece is formed by one-time deep drawing and is decomposed into three processes of corner multidirectional bending forming, corner slight wrinkle flattening and edge bending forming, but the three processes are continuously completed in one-time stamping process. Therefore, for production, the stamping forming process is simple and continuous, no equipment is required to be added, the stamping forming method is suitable for stamping forming of the flange-free magnesium alloy box-shaped part, the investment is low, no requirement is imposed on production batch, and the large-batch continuous production and the small-batch intermittent production can be realized.

Drawings

FIG. 1 is a schematic view of a male die of a stamping forming device for a magnesium alloy box-shaped part;

FIG. 2 is a schematic illustration of a magnesium alloy box stamping blank;

FIG. 3 is a schematic diagram of a cushion block of a stamping forming device for a magnesium alloy box-shaped part;

FIG. 4 is a schematic view of a female die of a stamping forming device for a magnesium alloy box-shaped part;

FIG. 5 is a schematic view of a heating ring of a stamping and forming apparatus for a magnesium alloy box-shaped part;

FIG. 6 is a schematic view of a stamped and formed part of a magnesium alloy box;

FIG. 7 is a schematic assembly view of a magnesium alloy box stamping device;

1. a male die; 2. a blank; 3. cushion blocks; 4. a female die; 5. and heating the ring.

Detailed Description

Example 1

As shown in fig. 1-7, the blank 2, the male die 1 and the female die 4 are all heated to the specified temperature of 100-; then the press drives the male die 1 to move downwards, the blank 2 is firstly formed at four corners of the female die 4, and the edges of the blank 2 are not in contact with the female die 4 and are in a free state; as the punch 1 descends, the corner of the blank 2 takes the shape required by the product, but the edge material near the corner of the blank 2 is slightly wrinkled, while the edge material far from the corner of the blank 2 is not deformed; the male die 1 continues to descend, and the slight wrinkles of the blank 2 close to the corner are flattened under the combined action of the curved surface shape of the corner of the female die 4, the male die 1 and the cushion block 3 and become a part of the side wall of the magnesium alloy box-shaped part 6; and the male die 1 continues to descend, and the edge material of the blank 2 is formed into the side wall part of the workpiece 6 through a bending method until the edge material of the blank 2 is completely formed into the side wall part of the workpiece 6, so that the forming of the magnesium alloy integral box-shaped workpiece 6 is completed.

Example 2

As shown in fig. 1-7, the blank 2, the male die 1 and the female die 4 are all heated to a specified temperature of 280 ℃ by a heating ring 5; then the press drives the male die 1 to move downwards, the blank 2 is firstly formed at four corners of the female die 4, and the edges of the blank 2 are not in contact with the female die 4 and are in a free state; as the punch 1 descends, the corner of the blank 2 takes the shape required by the product, but the edge material near the corner of the blank 2 is slightly wrinkled, while the edge material far from the corner of the blank 2 is not deformed; the male die 1 continues to descend, and the slight wrinkles of the blank 2 close to the corner are flattened under the combined action of the curved surface shape of the corner of the female die 4, the male die 1 and the cushion block 3 and become a part of the side wall of the magnesium alloy box-shaped part 6; and the male die 1 continues to descend, and the edge material of the blank 2 is formed into the side wall part of the workpiece 6 through a bending method until the edge material of the blank 2 is completely formed into the side wall part of the workpiece 6, so that the forming of the magnesium alloy integral box-shaped workpiece 6 is completed.

The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope and spirit of the invention as defined in the following claims.

Claims

1. A method for forming a magnesium alloy box-shaped piece is characterized in that a forming device used in the method sequentially comprises the following steps from top to bottom: the device comprises a male die (1), a cushion block (3), a female die (4) and a heating ring (5); the magnesium alloy blank (2) is arranged between the male die (1) and the cushion block (3);

wherein the method comprises the steps of: heating the magnesium alloy blank (2), the male die (1) and the female die (4) to a specified temperature of 100-; then the male die (1) is driven to move; the forming of the magnesium alloy integral box-shaped product (6) is completed by a stamping forming method of releasing the edge part, the preferential corner part and gradually and continuously forming; the method specifically comprises the following steps: the blank (2) is firstly formed at four corners of the female die (4), and the edge part of the blank (2) is not contacted with the female die (4) and is in a free state; as the punch (1) descends, the corner of the blank (2) is formed into the shape required by the product, but the edge material close to the corner of the blank (2) is slightly wrinkled, and the edge material far away from the corner of the blank (2) is not deformed; the male die (1) continues to move downwards, and the slight wrinkles of the blank (2) close to the corner are flattened under the combined action of the curved surface shape of the corner of the female die (4), the male die (1) and the cushion block (3) and become a part of the side wall of the magnesium alloy box-shaped part (6); and (3) continuing descending the male die (1), and forming the edge material of the blank (2) into the side wall part of the workpiece (6) by a bending method until the edge material of the blank (2) is completely formed into the side wall part of the workpiece (6), so as to finish the forming of the magnesium alloy integral box-shaped workpiece (6).

2. A method of forming a magnesium alloy box according to claim 1, wherein said magnesium alloy blank (2) is a magnesium alloy sheet having a thickness of 0.5-4 mm.

3. A method for forming a magnesium alloy box according to claim 1, wherein the magnesium alloy blank (2), the punch (1) and the die (4) are heated to a specified temperature of 280 ℃ by using a heating ring (5).