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Aluminum alloy for preparing air cylinder piston for ship and preparation method thereof

A technology of cylinder piston and aluminum alloy, applied in the field of aluminum alloy, can solve the problems of short service life of marine cylinder piston and decline in creep resistance, and achieve the reduction of grain size, improvement of casting fluidity, and improvement of hardness and friction resistance. Effect

Inactive Publication Date: 2017-05-31
重庆顺博铝合金股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the continuous development of the shipbuilding industry, the load capacity and speed of the ship continue to increase, and its requirements for power are getting higher and higher, resulting in the cylinder of the engine producing more and more pressure and friction on the piston during the working process. The aluminum alloy used to prepare the marine cylinder piston needs to have stronger mechanical strength. The existing technology mainly increases the friction resistance of the aluminum alloy by increasing the rigidity of the aluminum alloy, but the increase in rigidity will reduce the yield strength and creep resistance of the aluminum alloy. Degraded performance, marine cylinder pistons generally have a short lifespan and need to be replaced frequently

Method used

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  • Aluminum alloy for preparing air cylinder piston for ship and preparation method thereof
  • Aluminum alloy for preparing air cylinder piston for ship and preparation method thereof

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preparation example Construction

[0029] A method for preparing an aluminum alloy for a marine cylinder piston, comprising:

[0030] Weigh the raw materials in proportion, melt the raw materials in the container, pass the inert gas preheated for 2-3 minutes into the melt from the bottom of the container and let it stand for 30-40 minutes to make the scum fully float on the surface, remove the scum and keep it warm Stand still for 10-20 minutes, and cast to obtain an aluminum alloy ingot.

[0031] The aluminum alloy ingot is subjected to hot extrusion treatment, quenching treatment and aging treatment in sequence; the temperature of hot extrusion treatment is 400-420°C, and the speed is 0.2-0.5m / min; the temperature of quenching treatment is 530-540°C; The temperature of the treatment is 180-200°C.

[0032] More preferably, when feeding raw materials, first add pure aluminum ingots to the smelting furnace, raise the temperature to about 600°C, and then gradually raise the temperature to about 700°C at a heatin...

Embodiment 1

[0041] A method for preparing aluminum alloys for marine cylinder pistons, comprising:

[0042] Aluminum alloy raw materials were prepared according to the composition in Table 1, and the raw materials were melted in a container to obtain a melt. Inject the inert gas preheated for 2 minutes from the bottom of the container into the melt and let it stand for 30 minutes to make the scum fully float on the surface of the aluminum alloy liquid, remove the scum and let it stand for 10 minutes, then cast the formed aluminum alloy ingot. The aluminum alloy ingot was hot extruded at a temperature of 400° C. at an extrusion speed of 0.2 m / min. Heat the aluminum alloy ingot after hot extrusion treatment to 530°C and keep it warm for 10 minutes; cool the heat-preserved aluminum alloy ingot to 300°C within 5 minutes, and then cool it down to room temperature at a cooling rate of 10°C / min to complete quenching deal with. The quenched aluminum alloy ingot was heated to 180° C. and kept fo...

Embodiment 2

[0044] A method for preparing aluminum alloys for marine cylinder pistons, comprising:

[0045] Aluminum alloy raw materials were prepared according to the composition in Table 1, and the raw materials were melted in a container to obtain a melt. Inject the inert gas preheated for 2 minutes from the bottom of the container into the melt and let it stand for 30 minutes to make the scum fully float on the surface of the aluminum alloy liquid, remove the scum and let it stand for 10 minutes, then cast the formed aluminum alloy ingot. The aluminum alloy ingot was hot extruded at a temperature of 400° C. at an extrusion speed of 0.3 m / min. Heat the aluminum alloy ingot after hot extrusion treatment to 530°C and keep it warm for 10 minutes; cool the heat-preserved aluminum alloy ingot to 315°C within 4 minutes, and then cool it down to room temperature at a cooling rate of 10°C / min to complete quenching deal with. The quenched aluminum alloy ingot was heated to 180° C. and kept fo...

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Abstract

The invention provides an aluminum alloy for preparing an air cylinder piston for a ship and a preparation method thereof and belongs to the field of aluminum alloys. The aluminum alloy comprises, by weight, 15-17% of silicon, 1.25-2.45% of copper, 0.5-1.5% of iron, 0.2-0.4% of magnesium, 0.02-0.05% of boron, 0.02-0.07% of titanium, 0.03-0.07% of zirconium, 0.03-0.08% of vanadium, 0.01-0.02% of praseodymium, 0.01-0.02% of scandium, 0.01-0.02% of holmium, 0.01-0.03% of yttrium and the balance aluminum. The aluminum alloy is high in friction-resistant property, yield strength and creep-resistant property. The aluminum alloy preparation method sequentially comprises the following steps of ingot casting, hot extrusion, quenching and aging treatment according to a formula, the preparation technique is simple, alloy internal stress can be effectively removed, and the mechanical property of the alloy is reinforced.

Description

technical field [0001] The invention relates to the field of aluminum alloys, and in particular to an aluminum alloy used for preparing marine cylinder pistons and a preparation method thereof. Background technique [0002] Aluminum alloy is a general term for alloys based on aluminum. The main alloying elements are copper, silicon, magnesium, zinc or manganese, and the secondary alloying elements are nickel, iron, titanium, chromium or lithium. Aluminum alloy has good processability, especially hypoeutectic silicon-aluminum alloy, which not only has good processability, but also has light specific gravity, beautiful surface and corrosion resistance, good casting performance, and good comprehensive mechanical properties of products, which can be used to make various forms of parts. Widely used in many fields. In view of the above advantages, the existing marine pistons are usually cast with aluminum alloy as material. [0003] With the continuous development of the shipbui...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22F1/043F02F3/00
CPCC22C21/02C22F1/002C22F1/043F02F3/0084F05C2201/903
Inventor 王增潮李新生罗乐
Owner 重庆顺博铝合金股份有限公司
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