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Extrusion molding mould and molding method of large-length-width-ratio aluminum alloy rectangular box-shaped piece

A technology for extrusion forming and box-shaped parts, applied in the direction of metal extrusion dies, etc., can solve the problems such as the increase of allowable deep drawing deformation, the phenomenon of the lug at the end of the box-shaped part, and the difficulty in controlling the lug defect, and achieve a single The effect of low cost of parts, improvement of lug defects, and improvement of material utilization

Active Publication Date: 2012-10-17
安徽金铂新材料科技有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

However, this method only increases the allowable drawing deformation of the sheet by 10% to 15%, and the improvement effect is limited.
[0004] Further search found that in order to replace the multi-pass deep drawing process of thin-walled rectangular box-shaped parts with large aspect ratio, KIM et al. in the paper "Investigation of lubrication effect on the backward extrusion of thin-walled rectangular aluminum case with large aspect ratio" (Journal of Materials Processing Technology, 2006, 180(1-3): 185-192) (The influence of lubrication on the back extrusion forming of thin-walled rectangular aluminum box parts with large aspect ratio) mentioned the use of back extrusion process A rectangular box-shaped part with a large aspect ratio is formed, but due to the use of a conventional flat-bottomed extrusion punch, there are obvious lugs at the end of the box-shaped part, and this lug defect cannot be directly eliminated by improving the lubrication condition
Obviously, the lug phenomenon will reduce material utilization and increase unit cost
[0005] Moreover, deep drawing cannot form a rectangular box-shaped part with a small boss for assembly at the bottom. It is difficult to control the defects of the lugs after extrusion with a conventional flat-bottomed punch. After extrusion, it may be necessary to add a set of special lug removal dies. To improve production efficiency, there is an urgent need for a new precision forming method for rectangular box-shaped parts with a large aspect ratio

Method used

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  • Extrusion molding mould and molding method of large-length-width-ratio aluminum alloy rectangular box-shaped piece
  • Extrusion molding mould and molding method of large-length-width-ratio aluminum alloy rectangular box-shaped piece
  • Extrusion molding mould and molding method of large-length-width-ratio aluminum alloy rectangular box-shaped piece

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Experimental program
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Effect test

Embodiment 1

[0030] The first step is to use the annealed 1060 aluminum alloy aluminum material for rough preparation, according to figure 2 The part diagram of the rectangular box-shaped part (with convex column) that needs to be formed is shown, and the size of the rectangular blank is determined as: 167.9mm×43.9mm×13.9mm;

[0031] The second step is to corrode the blank with 10%wt. NaOH solution for 10 minutes;

[0032] The third step is to evenly coat zinc stearate powder on the corroded blank to provide lubrication for subsequent extrusion;

[0033] The fourth step, use such as figure 1 The shown punch with damping ribs is used to extrude rectangular box-shaped parts at an extrusion speed of 10mm / s. There are 6 damping ribs distributed symmetrically and equidistantly at the bottom of the punch. The specific parameters are: the length of the longest damping rib L=90.0mm, the angle α=60°, the width d=3.7mm, and the thickness t=1.0mm.

[0034] The fifth step, according to the height ...

Embodiment 2

[0037] The first step is to use the annealed 1060 aluminum alloy aluminum material for rough preparation, according to figure 2 The part diagram of the rectangular box-shaped part (with convex column) that needs to be formed is shown, and the size of the rectangular blank is determined as: 167.9mm×43.9mm×14.7mm

[0038] The second step is to corrode the blank with 10%wt. NaOH solution for 10 minutes;

[0039] The third step is to evenly coat zinc stearate powder on the corroded blank to provide lubrication for subsequent extrusion;

[0040] The fourth step, use such as figure 1 The shown punch with damping ribs is used to extrude rectangular box-shaped parts at an extrusion speed of 10mm / s. There are 6 damping ribs distributed symmetrically and equidistantly at the bottom of the punch. The specific parameters are: the longest damping rib length L=110.0mm, angle α=100°, width d=2.2mm, thickness t=0.8mm.

[0041] The fifth step, according to the height of the box-shaped piec...

Embodiment 3

[0044] The first step is to use the annealed 1060 aluminum alloy aluminum material for rough preparation, according to image 3 The part diagram of the rectangular box-shaped part (without convex column) shown in the figure, the size of the rectangular blank is determined as: 167.9mm×43.9mm×14.0mm;

[0045] The second step is to corrode the blank with 10%wt. NaOH solution for 10 minutes;

[0046] The third step is to evenly coat zinc stearate powder on the corroded blank to provide lubrication for subsequent extrusion;

[0047] The fourth step, use such as figure 1 The shown punch with damping ribs is used to extrude rectangular box-shaped parts at an extrusion speed of 10mm / s. There are 6 damping ribs distributed symmetrically and equidistantly at the bottom of the punch. The specific parameters are: the length of the longest damping rib L=90.0mm, the angle α=60°, the width d=3.7mm, and the thickness t=1.0mm.

[0048] The fifth step, according to the height of the box-shaped...

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Abstract

The invention provides an extrusion molding mould and a molding method of a large-length-width-ratio aluminum alloy rectangular box-shaped piece, and belongs to the technical field of plastic molding of metal. The method comprises the following steps of: 1. utilizing annealed-state aluminum alloy raw materials to prepare a blank; 2. corroding the blank by using an NaOH solution and corroding for 8-15 minutes; 3. uniformly coating zinc stearate powder on a corroded blank and providing lubrication for subsequent extrusion molding; 4. utilizing a convex mould with a damping rib to carry out the extrusion molding on the rectangular box-shaped piece; and 5, according to the height of the box-shaped piece, meeting the design and use requirements that the end surface of the box-shaped piece which is subjected to saw cutting and extruding. The extrusion molding mould and the molding method of the large-length-width-ratio aluminum alloy rectangular box-shaped piece avoid the defects of wrinkling, cracking, ledging and the like in a forming process of the rectangular box-shaped piece and improve the product yield; and meanwhile, the machining procedure is effectively reduced, the material utilization rate is increased, the mold cost is saved and the production cost of a single piece is reduced.

Description

technical field [0001] The invention relates to a device and method in the technical field of metal plastic forming, in particular to an extrusion forming die for an aluminum alloy rectangular box-shaped piece with an aspect ratio of 3.5 or more and a forming method thereof. Background technique [0002] In view of the advantage that the forming force required for deep drawing is small, the forming and manufacturing of rectangular box-shaped parts often adopts deep drawing. The wall of a rectangular box-shaped part is composed of long sides, short sides and rounded corners. During deep drawing, each part interacts and restricts, which is prone to uneven deformation, especially for parts with large aspect ratios. Similar to deep drawing of cylindrical parts, uneven deformation can easily lead to forming defects such as wrinkling, uneven wall thickness and bottom cracking; when there is no blank holder for deep drawing, it is easy to form obvious ear defects. When the depth o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C25/02B21C23/00
Inventor 胡成亮孟丽芬赵震
Owner 安徽金铂新材料科技有限公司
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