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Isothermal extrusion die and extrusion method thereof

A technology of isothermal extrusion and die, applied in the field of alloy processing, can solve the problems of long heating time and low efficiency, and achieve the effect of increasing the output rate, increasing the preheating temperature and prolonging the service life

Pending Publication Date: 2022-06-17
CITIC DICASTAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The bar is usually heated by induction furnace and electric heating wire furnace before extrusion. The induction furnace conducts induction heating on the bar. The advantage is fast heating, which is suitable for fast-paced production, but the disadvantage is also obvious. The internal and external heating will be caused by time and other reasons. The temperature of the inner and outer layers of the bar is not uniform, and the advantage of using an electric heating wire furnace is that the temperature of the inner and outer layers of the heated bar is more uniform, but the heating time is longer and the efficiency is lower.

Method used

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  • Isothermal extrusion die and extrusion method thereof
  • Isothermal extrusion die and extrusion method thereof
  • Isothermal extrusion die and extrusion method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Rapid extrusion process: use the gradient temperature form of heating 100℃ / 1 hour, heat the extrusion cylinder 1 to 450℃~480℃, heat the mold to 460℃~500℃, and keep the temperature for 2-4 hours; A proper amount of aluminum rods are heated to 460℃~500℃ in a resistance furnace, and kept for 30 minutes; after the mold is assembled, the mold is locked in the extrusion position, and the heated aluminum rods are raised to the alignment position of the material tank by the feeding frame; Open the five sets of temperature sensor controllers, cooling pipes 6 and compensation pipes 7; the main cylinder is extruded forward, and the heat loss of each section in the rapid extrusion process is less than the temperature increase caused by extrusion. Both the environmental and practical correction results work, and the compensation pipe 7 does not work; the primary deformation cylinder 2 cooling pipe 6 is cooled according to the theoretical calculation and practical correction results t...

Embodiment 2

[0046] Rapid extrusion process: use the gradient temperature form of heating 100 ° C / 1 hour, heat the extrusion cylinder 1 to 450 ° C, heat the mold to 480 ° C, and keep it for 2-4 hours; take an appropriate amount of aluminum rod into the resistance The furnace is heated to 480°C and kept for 30 minutes; after assembling the mold, lock the mold in the extrusion position, and use the feeding rack to raise the heated aluminum rod to the alignment position of the material tank; open the five sets of temperature sensors, cool down Pipe 6 and compensation pipe 7; the main cylinder is extruded forward, the heat loss of each section in the rapid extrusion process is less than the temperature increase caused by extrusion, and each cooling pipe 6 works according to theoretical calculation, heat dissipation environment and practical correction results, The compensation tube 7 does not work; the cooling tube 6 of the primary deformation cylinder 2 is cooled according to the theoretical c...

Embodiment 3

[0049] Medium-speed extrusion process: adopt the form of heating 100℃ / 1 hour gradient, heat the extrusion cylinder 1 to 300℃, heat the die to 320℃, and keep the temperature for 2-4 hours; The resistance furnace was heated to 350°C, and kept for 30 minutes; further, after the mold was assembled, the mold was locked in the extrusion position, and further, the heated magnesium rod was raised to the alignment position of the material gallbladder using the feeding rack; open Temperature sensor controller, compensation pipe 7 and cooling pipe 6, the main cylinder is extruded forward; in the medium-speed extrusion process, the heat loss in the transition zone and the forming zone is greater than the temperature increase caused by the extrusion friction, the compensation pipe 7 works, and the extrusion The heat loss in the area is less than the temperature increase caused by the extrusion, and the cooling pipe 6 works; the cooling pipe 6 of the primary deformation cylinder 2 is cooled ...

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Abstract

The isothermal extrusion die comprises an extrusion cylinder, a flow guide cylinder and a forming cylinder which are axially arranged from left to right, the cross sectional areas are sequentially reduced, the extrusion cylinder and the flow guide cylinder are in butt joint communication through a first-stage deformation cylinder, and the flow guide cylinder and the forming cylinder are in butt joint communication through a second-stage deformation cylinder. The extrusion cylinder, the flow guide cylinder and the forming cylinder are equal in cross sectional area and same in shape on the two sides, the cross sectional area of the first-stage deformation cylinder and the cross sectional area of the second-stage deformation cylinder are gradually decreased from left to right, cooling pipes are wound outside the flow guide cylinder, the forming cylinder, the first-stage deformation cylinder and the second-stage deformation cylinder, and a temperature sensing controller is further arranged in the mold. The conditions of stress concentration and temperature rising and falling in the extrusion process can be effectively dispersed, the extrusion temperature change of the die and the bar in the cavity is detected in the whole process, the whole extrusion process is conducted in a constant-temperature state, the temperatures of the inner layer and the outer layer of the discharged material and the front section and the tail section of the extruded bar are balanced and uniform, and the output rate is high. Deformation of the die caused by high temperature, high pressure and high friction is effectively prevented, and the service life of the die is prolonged.

Description

technical field [0001] The invention relates to the field of alloy processing, in particular to an isothermal extrusion die and an extrusion method thereof. Background technique [0002] At present, there is still a big gap between China's aluminum alloy hot deformation extrusion process and foreign developed countries. Many aluminum extrusion production hopes to adopt new low-temperature rapid extrusion technology. Usually, the extrusion speed of solid profiles is 15m / min-50m / min. Between 10m / min-35m / min for hollow profiles, rapid extrusion means that the extruded product flows out of the die hole at a speed of more than 60m / min, due to the uneven flow of metal during extrusion (in the absence of lubrication It is especially serious when extruding), the bar itself has a certain temperature, and a lot of energy is generated during the extrusion production process, which leads to the continuous increase of the mold temperature, the bar is easily over-burned, and the discharge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C25/02B21C31/00B21C23/04B21C29/04
CPCB21C25/02B21C31/00B21C23/04B21C29/04B21C23/08B21C23/001
Inventor 黄礼新朱志华王渭新谢理光李永飞贾超航谷馨宇李世德董秀松魏晨光曹健强
Owner CITIC DICASTAL
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