A kind of aluminum alloy hollow profile extrusion die

A hollow profile and extrusion die technology, applied in metal extrusion die and other directions, can solve the problems of high Al-Zn-Mg alloy viscosity, high flow stress, low die life and other problems, achieve high flow stress, improve stress, The effect of improving the life of the mold

Active Publication Date: 2017-06-06
广西南南铝加工有限公司
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Problems solved by technology

[0004] In the general hollow profile mold design, the core head is directly supported by the shunt bridge, and the empty knife in front of the core head working belt is generally vertical. Orientation, most prone to cracking, low die life

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  • A kind of aluminum alloy hollow profile extrusion die
  • A kind of aluminum alloy hollow profile extrusion die
  • A kind of aluminum alloy hollow profile extrusion die

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Embodiment Construction

[0021] The invention discloses an aluminum alloy hollow profile extrusion die, which comprises an upper die 1 and a lower die 2 superimposed front and back. The feed surface of the upper die 1 is evenly distributed with a plurality of shunt bridges 4, and a shunt flow is formed between adjacent shunt bridges 4. Hole 5, the shunt bridge 4 connects and supports the core head 9 located in the center of the upper mold 1; the core head 9 is provided with a through hole along its central axis, and a matching rod is provided in the through hole, and the two ends of the rod are formed Squeeze both ends of core head 9.

[0022] Aiming at the problems that Al-Zn-Mg alloy has high viscosity and large flow stress, it is most likely to crack in the exit direction of shunt bridge 4 and core head 9, and the mold life is low, the invention adopts the design of dispersing extrusion force. That is, a through hole is arranged along the central axis of the core head 9, and rods with matching size...

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Abstract

The invention relates to the field of an aluminium alloy profile extrusion die and provides an aluminium alloy hollow profile extrusion die, which comprises an upper die, a lower die and a die backer which are overlapped front and back; a plurality of flow dividing bridges are uniformly distributed on the feeding face of the upper die; flow dividing holes are formed between the adjacent flow dividing bridges; the flow dividing bridges are connected with a core head positioned in the center of the upper die and supports the core head; a through hole is formed in the core head along the center axis of the core head; a matched rod part is arranged in the through hole; two end faces of the core head are extruded by the two ends of the rod part. According to the invention, stress of the flow dividing bridges is improved, the service life of the die is prolonged, the temperature of an extrusion ingot also can be reduced, recrystallization is prevented and excellent economic benefits are achieved.

Description

technical field [0001] The invention relates to the field of aluminum alloy profile extrusion dies, in particular to an Al-Zn-Mg alloy hollow profile extrusion die for high-speed rail car bodies. Background technique [0002] With the rapid development of China's high-speed rail, from the introduction, digestion, absorption, innovation, to the localization of key aluminum alloy materials for car bodies, China's aluminum extrusion has also ushered in new development. For Al-Zn-Mg alloy hollow profiles, which are the most difficult to extrude for high-speed rail car bodies, the requirements for molds are very strict. Al-Zn-Mg alloy belongs to 7xxx alloy, which has high viscosity and high hardness, and its flow stress is much larger than 6xxx. This type of alloy is generally a solid profile, which is easier to squeeze, but for this type of alloy hollow profile, it is very difficult to squeeze. Very easy to crack. Extruded at high temperature, the alloy is prone to recrystalli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C25/02
CPCB21C25/02
Inventor 李飞龙庞远清李振华刘志伟蓝峥卢晓温林韬袁冰梅
Owner 广西南南铝加工有限公司
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