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Method for preparing forging piece of aluminum-steel composite structure track plate

A composite structure and track shoe technology, which is applied in the field of metal material processing, can solve the problems of not meeting the mechanical performance index of static breaking of special vehicles, difficult control of internal metallurgical quality, and low aluminum-steel bonding strength, so as to achieve lightweight , Reliable overall strength and reliable structural performance

Active Publication Date: 2017-03-22
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Although the deformed aluminum alloy has high strength, its wear resistance is poor. The track shoes with aluminum-steel composite structure can realize the requirements of weight reduction and wear resistance at the same time.
At present, Beijing General Research Institute of Nonferrous Metals has successfully realized aluminum-steel composite structure track shoes by using liquid die forging technology, but the essence of liquid die forging alloy is composed of a large number of casting structures and a small number of deformed structures, the structure is loose and not dense, and the internal metallurgical quality Difficult to control, poor fatigue performance, low aluminum-steel bonding strength, does not meet the mechanical performance index of static breaking of special vehicles, and is not suitable for special vehicles with large tonnage

Method used

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Examples

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preparation example Construction

[0019] A method for preparing an aluminum-steel composite structure track shoe, specifically as follows:

[0020] 1) Using 2XXX series or 7XXX series deformed aluminum alloys as raw materials, such as 7075 aluminum alloys, according to the alloy composition and ingredients specified in GB / T 3190, first melt pure aluminum in a crucible furnace at 800-850 °C, and then add Cu at 740 °C , after stirring evenly, add Zn at 720°C, continue to stir evenly, add Mg, then add Cr and other trace elements, then add hexachloroethane refining agent to refine for 3 times, degassing, slag removal, standing for 20min, and transfer the aluminum melt Put it into the pre-casting tank, heat up to 690-710°C, and start semi-continuous casting. The ingot size is Φ500mm. The specific process parameters are as follows: casting temperature 700°C, casting speed 20-30mm / min, water pressure 0.04-0.08MPa.

[0021] 2) Peel the ingot to Φ450±2mm, the length is not less than 700mm, extrude the ingot into a rect...

Embodiment 1

[0026] 1) 2A14 aluminum alloy is used as raw material, and the ingredients are prepared according to the chemical composition required by GB / T 3190. Firstly, pure aluminum is melted in a crucible furnace at 820°C, then Cu is added at 740°C, after stirring evenly, Mg is added, and then Mn, etc. Trace elements and alloy elements are thoroughly melted and stirred evenly, then refined with hexachloroethane refining agent twice, degassed, slag removed, and left to stand for 20 minutes, then transfer the aluminum melt to the pre-casting tank, heat up to 705°C, Start semi-continuous casting, ingot size Φ640mm, specific process parameters are as follows: casting temperature 705°C, casting speed 35mm / min, water pressure 0.06MPa.

[0027] 2) Peel the ingot to Φ580mm, the length is 703mm, the ingot heating temperature is 460°C, the extrusion cylinder is heated to 450°C, the extrusion speed is 0.4mm / min, and the ingot is extruded into Φ120mm by a 5500-ton reverse extrusion machine The ext...

Embodiment 2

[0032] 1) Use 7050 aluminum alloy as the raw material, mix according to the required chemical composition, first melt the pure aluminum in a crucible furnace at 840°C, then add Cu at 740°C, stir evenly, add Zn at 720°C, continue stirring evenly and add Mg , then add trace elements such as Zr, then add hexachloroethane refining agent to refine for 5 times, degass, remove slag, and let it stand for 20 minutes, transfer the aluminum melt to the pre-casting tank, heat up to 695°C, and start semi-continuous Casting, ingot size Φ480mm, specific process parameters are as follows: casting temperature 695°C, casting speed 27mm / min, water pressure 0.05MPa.

[0033]2) Peel the ingot to Φ448mm, length 790mm, heat the ingot at 400°C, heat the extrusion barrel to 450°C, extrude at a speed of 0.2mm / min, and extrude the ingot to 280mm through an 8200-ton forward extrusion machine The extruded strip plate with a cross-section of ×60mm is cut into a length of 110mm / piece according to the size r...

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Abstract

The invention belongs to the field of metal material processing, and relates to a track plate preparation method, in particular to a method for preparing a forging piece of an aluminum-steel composite structure track plate. The method includes the steps that an ingot casting is prepared by means of semi-continuous casting at first; then the aluminum alloy ingot casting is prepared into an extrusion material by the adoption of forward or backward extrusion; the extrusion material is blanked according to the dimension, and an aluminum alloy track plate pre-forging piece is pre-forged through constant temperature die forging; and afterwards, a cast steel block and a pre-forged aluminum alloy track plate are forged into a whole by means of finish forging, so that the aluminum-steel composite structure is formed. The weight of the aluminum-steel composite structure track plate prepared through the method is lowered by 30% compared with a steel track plate; and meanwhile the abrasion resistance and overall strength of the track plate can be guaranteed, and the structural performance is reliable.

Description

technical field [0001] The invention belongs to the field of metal material processing, and relates to a method for preparing a track shoe, in particular to a method for preparing a forging of a track shoe with an aluminum-steel composite structure. Background technique [0002] At present, the track shoes of infantry fighting vehicles in our country are mainly made of cast steel. The excessive weight of the steel track shoes leads to low combat mobility of the tank, which seriously affects the combat effectiveness of our infantry fighting vehicles. At present, a light-duty infantry fighting vehicle has used aluminum alloy track shoes, while a light armored fighting vehicle with a larger tonnage still uses steel track shoes. In order to adapt to the rapid assembly and conversion of troops, light infantry fighting vehicles urgently need to use aluminum track shoes. Therefore, it is urgent to develop a high-strength aluminum alloy track shoe to replace the steel track shoe. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00B21J5/02B21J1/06
CPCB21J1/06B21J5/002B21J5/02B23P15/00
Inventor 高文林孙刚李国爱孙进宝陆政
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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