Optimization Design of Several Aluminum Profile Extrusion Dies

Foreword : The quality and efficiency of aluminum profile production are closely related to the design and structure of extrusion die. Based on the work experience and production experience over the past few years, the author briefly introduces several optimizations of aluminum extrusion die which often have problems in actual production. Design practice, discussed with colleagues.

1. Optimization of some large section hollow profile moulds

In the case of conventional design, hollow sections with large hollow sections often have large surface wave, uneven gaps, obvious weld defects, etc. These problems occur, usually due to the irrationality of the mold design structure. To this end, the author in the mold design: the upper mold uses a partial bridge, the lower mold in the silo with a convex rib design.

Due to defects in the large surface of the profile and the gap between the plane gaps in the production process, it is generally caused by the fact that the large-surface splitting hole is close to the center and the metal flow rate is fast. Therefore, it is appropriate to place the large-faced die hole in the welding chamber. The length of the rib, so that when the metal flows to the die hole, the rib acts like a low wall to hinder the flow of the metal, and if the obstruction is too much, it is also convenient to repair the mold.

At the same time, the quality of certain welds is also optimized accordingly.

For some rectangular cavities, square tube profiles with large aspect ratios, the weld line often appears on the large decorative surface. It is now possible to change the symmetrical bridge to a partial bridge type. The weld is formed because the metal flow through the split hole is not sufficiently welded before entering the hole under the split bridge. Obtaining high-strength and high-quality welds is of course our ideal. However, if the weld is inevitably present on the large side of the profile or on the decorative surface during the production process, it may be as far as possible from the large or decorative surface. In the case of the split hole, the center line of the mold bridge is shifted outward (a: b = 2: 1, a1 = a2). Generally, since the metal flow velocity in the large-surface split hole is fast, when the form of the split bridge is designed to be a bridge type, this increases the space in which the flow in the large-surface split hole is filled to both sides, and with the center of the split bridge The outward offset of the line also shifts the position of the flow soldering station. Therefore, this adjusts the flow rate of the large surface metal and makes the weld be away from the center.

2. Optimization of double-die hole easy-wall hollow profile mould

Under normal circumstances, whether the two mold holes are discharged up and down, or left and right discharge, the metal flow rate near the center side is fast, and the supply is sufficient, so that the upper mold core is elastically deformed outward, causing the profile to be away from the center and a thin wall. Partial wall defects. Therefore, in the mold design process, when the section size of the profile is increased, the offset dimension of the cross-wall which usually produces the partial wall is reserved in advance. If the two die holes share the center split hole, in order to ensure relatively stable supply of the two die holes, a baffle type splitter bar can be added in the middle position of the two holes in the silo, which is also advantageous for repairing the mold.

3. Optimization of flat profile mould with small opening and large hanging wall area

Under the condition of the flat mold design which is usually fully fed directly, the profile of the cantilever is easy to be deformed so much that it is broken or dropped. In this case, it can be designed as a hanging core mold, but it is not easy to repair the mold. Some profiles have very small openings and are almost closed. This can be combined, but the openings need to be tight.

Generally, the flat profile with small opening and large armrest area can design the straight feed plate as a bridge feed plate or a cantilever bridge feed plate, and place the forceful suspended wall surface under the bridge, so that the profile can be The cantilever is protected. When the metal stream fills the die hole, the metal flow from the feed plate passes through the bridge of the bridge feed plate to block the cantilever without directly acting thereon, thereby reducing the positive pressure on the die cantilever. Improve the stress state of the cantilever. Extends the life of the mold.

4. Optimized design of long section flat profile die with large aspect ratio

Because the length-to-thickness ratio of the profile is relatively large, the wall thickness is sometimes thin, and the flow velocity of the metal near the center is relatively fast. The flow velocity of the die hole is limited only by the length of the working tape, so deformation defects are easily generated. The bridge feeding rice is now used, so that the intermediate metal flow rate can be effectively adjusted, so that the flow velocity of the die holes is balanced and good results can be obtained.

5 Conclusion

Practice has proved that the optimization of the above several aluminum extrusion die designs is effective in actual production. Compared with the past, the extruded aluminum alloy profile has been well formed, dimensional accuracy, easy to guarantee, and surface quality has been improved. Thereby, the production efficiency of profile extrusion is greatly improved and the production cost of the product is lowered.

For the extrusion die design of aluminum profile products, with the rapid development of various industries, the shape of the profile of the profile is complicated and diversified, and it is designed according to the conventional common form, and there are many shortcomings. Therefore, in order to obtain high-quality profiles, we must constantly learn, accumulate, and constantly transform and innovate in production and life.