Preparation method of aluminium alloy semi-solid state blank for large size forging

An aluminum alloy, large-size technology, applied in the field of preparation of aluminum alloy semi-solid billets, can solve the problems of uneven deformation, rapid heating of the billet, and the uniformity of the billet temperature cannot be well controlled, so as to achieve uniform temperature uniformity and shorten heating Unified effect of time and heating

Active Publication Date: 2008-10-15
CSIC NO 12 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a semi-solid aluminum alloy blank for large-scale forging, which is used for forming and processing larger aluminum alloy parts, and solves the uneven deformation of the blank when the cold deformation amount is large enough, and The rapid heating of the billet and the problem that the uniformity of the billet temperature cannot be well controlled

Method used

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  • Preparation method of aluminium alloy semi-solid state blank for large size forging
  • Preparation method of aluminium alloy semi-solid state blank for large size forging
  • Preparation method of aluminium alloy semi-solid state blank for large size forging

Examples

Experimental program
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Effect test

Embodiment 1

[0052] The commercially available 7A09 aluminum alloy extruded bar is cut off with a sawing machine and the two ends are flattened to make a round bar blank with a diameter of Φ90mm and a length of 150mm, and the round bar blank is placed in a resistance furnace , at a temperature of 400°C, keep warm for 1h for annealing, then cool with the furnace at a cooling rate of less than 30°C / h; forge the annealed round bar blank on a 500Kg air hammer, and the hammer anvil preheating temperature 100°C; forging follows the principle of "light-heavy-light", that is, light beating first, so that the end face of the billet and the hammer anvil are firmly attached, and the contact area between the end face of the round bar billet and the hammer anvil is less than 30% of the area of ​​the end face of the round bar billet , and then hit again, each time hitting 1.5mm ~ 2mm. The diameter of the upper part of the round bar blank exceeds the diameter of the lower part by 4mm, and it is turned ar...

Embodiment 2

[0054] The commercially available 7A09 aluminum alloy extruded bar is cut off with a sawing machine and the two ends are flattened to make a round bar blank with a diameter of Φ140mm and a length of 225mm, and the round bar blank is placed in a resistance furnace , at a temperature of 420°C, keep warm for 3 hours for annealing, then cool with the furnace at a cooling rate of less than 30°C / h; forge the heat-treated round bar blank on a 750Kg air hammer, and the hammer anvil preheating temperature 250°C; forging follows the principle of "light-heavy-light", that is, at the beginning of hammering, hit lightly so that the end face of the billet and the hammer anvil are firmly attached, and the contact area between the end face of the round bar billet and the hammer anvil is smaller than that of the end face of the round bar billet 30% of the area, and then hit again, each time 1.5mm ~ 2mm, the diameter of the upper part exceeds the diameter of the lower part by 4mm, turn around fo...

Embodiment 3

[0056] The commercially available 7A09 aluminum alloy extruded bar is cut off with a sawing machine and the two ends are flattened to make a round bar blank with a diameter of Φ110mm and a length of 188mm, and the round bar blank is placed in a resistance furnace , at a temperature of 410°C, keep warm for 2 hours for annealing, and then cool with the furnace at a cooling rate of less than 30°C / h; forge the heat-treated round bar blank on a 750Kg air hammer, and the hammer anvil preheats the temperature The temperature is 175°C; forging follows the principle of "light-heavy-light", that is, at the beginning of hammering, hit lightly so that the end face of the billet and the hammer anvil are firmly attached, and the contact area between the end face of the round bar billet and the hammer anvil is smaller than that of the end face of the round bar billet 30% of the area, and then hit again, each time 1.5mm ~ 2mm, the diameter of the upper part exceeds the diameter of the lower pa...

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Abstract

The invention discloses a method for preparing semisolid aluminum alloy blank forged in big size and comprises the steps of processing a forged aluminum alloy extrusion rod to be sold on the market into a blank 150-225mm long; placing the blank in an environment with a temperature of 400DEG C-420DEG C, keeping the temperature for 1h-3h, and cooling the blank with a furnace at a speed less than 30DEG C/h; and forging the blank by adopting the dynamic loading narrow anvil small deformation technology. The preheating temperature of the anvil is 100DEG C-250DEG C, the contact area of the blank with the anvil is less than 30%, the forging principle of light-heavy-light is followed, and the total deformation degree of the blank is 20%-40%. The heating module of forging technology simulation software is used for optimizing heating technology, and triple heating technology is adopted to realize the quick uniformity and heating of the blank. Therefore, the forged fine semisolid aluminum alloy blank of big size is good in spheroidization, and uniform in grain size. The method solves the problems that the blank is too big to deform uniformly under cold deformation, and that the quick heating of the big blank and the uniformity of the blank temperature are not easy to control.

Description

technical field [0001] The invention belongs to the technical field of metal material thermoforming, and relates to the preparation of an aluminum alloy blank for forging, in particular to a method for preparing an aluminum alloy semi-solid blank for large-scale forging. Background technique [0002] Semi-solid forming processing is one of the advanced manufacturing technologies with the most development potential at present. It has the advantages of long mold life, low pressure, small equipment tonnage, high productivity, and energy saving. The manufactured parts have high quality and superior Performance, and can realize the near and net shape of the parts. [0003] In the semi-solid billet forming method, a semi-solid billet with a non-dendritic structure and a near-spherical structure must first be prepared. The literature [K.P.Young, C.P.Kyonka and J.a.Courtois, "Fine grained metalcompositon", U.S. Patent, 4415374, 1038 (1983)] discloses the strain-induced melt activat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J1/00B21J1/06B21J5/00C22F1/04
Inventor 赵孟舟雍艺龙陈鹏波马敏团黄引平何源郝炜
Owner CSIC NO 12 RES INST
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