CN1693507A

CN1693507A - Manufacturing method of aluminium alloy piston

Info

Publication number: CN1693507A
Application number: CN 200510010000
Authority: CN
Inventors: 姜文举; 张万金; 刘维州; 宋薇; 金龙兵
Original assignee: Northeast Light Alloy Co Ltd
Current assignee: Northeast Light Alloy Co Ltd
Priority date: 2005-05-20
Filing date: 2005-05-20
Publication date: 2005-11-09
Anticipated expiration: 2025-05-20
Also published as: CN100334242C

Abstract

A technology for making Al-alloy piston with high antiwear and anticorrosion performance includes such steps as providing a cylindrical cast Al-alloy ingot containing proportionally Si, Fe, Cu, Mn, Mg, Ni, Zn, Cr, Ti and Al, heating to 450-470 deg.C, squeezing, cutting short, free forging, die forging, quenching and ageing twice.

Description

The manufacture method of aluminium-alloy piston

Technical field:

The present invention relates to a kind of train and take turns the manufacture method of piston peculiar to vessel.

Background technology:

Along with the development of sea transport and transportation by railroad, oil engine has substituted the steamer that falls behind.Piston is as one of key part in the locomotive in the diesel locomotive, it is the alloy of 4A11 or 2A70 that past is adopted spheroidal graphite cast iron and model always, yet the wear resistance of 4A11 or 2A70 alloy, erosion resistance, thermal expansivity etc. are relatively poor, influenced the work-ing life of piston, and the proportion of cast iron is bigger than aluminium alloy, the piston weight of cast iron is heavy, also is unfavorable for the work of diesel locomotive.

Summary of the invention:

In order to overcome existing train and to take turns the relatively poor defective such as wear resistance, erosion resistance, thermal expansivity of piston peculiar to vessel, a kind of manufacture method of aluminium-alloy piston is provided, thereby can produce a kind of wear resistance, erosion resistance is strong, low, the lightweight aluminium-alloy piston of thermal expansivity.Technical scheme of the present invention realizes by following step: one, columned alloy cast ingot is heated to 450～470 ℃, Si is 11.5%～13.5% in the weight percent of described alloy cast ingot, and Fe is≤0.10%, Cu is 0.5%～1.3%, Mn is≤0.20%, and Mg is 0.8%～1.3%, and Ni is 0.5%～1.3%, Zn is≤0.25%, Cr is≤0.10%, and Ti is≤0.15%, single impurity≤0.05%, add up to impurity≤0.15%, all the other are Al; Two, by cutting off after the extruding, make rough forging; Three, woolen cloth quenches behind free forging and die forging; Four, carry out ageing treatment.The invention has the advantages that: 1, piston abrasion-proof and the erosion resistance with present method manufacturing is improved, and piston IC engine is extended for overhaul more than 500,000 kilometers by 300,000 kilometers original overhauls.2, reduced finished weight, adopting the manufacturing of spheroidal graphite cast iron method originally is each about 65.5 kilograms, about 22.5 kilograms of the piston that present method is made, and loss of weight is more than one times.3, the thermal expansivity of piston is less, and the working condition of oil engine is greatly improved.

Embodiment:

Embodiment one: present embodiment realizes by following step: one, columned alloy cast ingot is heated to 450～470 ℃, Si is 11.5%～13.5% in the weight percent of described alloy cast ingot, and Fe is≤0.10%, Cu is 0.5%～1.3%, Mn is≤0.20%, and Mg is 0.8%～1.3%, and Ni is 0.5%～1.3%, Zn is≤0.25%, Cr is≤0.10%, and Ti is≤0.15%, single impurity≤0.05%, add up to impurity≤0.15%, all the other are Al; Two, by cutting off after the extruding, make rough forging; Three, woolen cloth quenches behind free forging and die forging; Four, carry out ageing treatment.

Embodiment two: in the present embodiment, step 1 interalloy ingot casting is heated to 452 ℃, and Si is 11.7% in the weight percent of described alloy cast ingot, Fe is 0.02%, and Cu is 0.7%, and Mn is 0.05%, Mg is 0.9%, Ni is 0.7%, and Zn is 0, and Cr is 0.01%, Ti is 0.02%, single impurity≤0.05% adds up to impurity≤0.15%, and all the other are Al; Quenching temperature is 520～525 ℃ in the step 3, and the soaking time of quenching is 230～250 minutes, and the temperature of quenching institute water is 50～60 ℃; The one-level aging temp is 140～145 ℃ in the step 4, and soaking time is 3.5～4.5 hours; The secondary time effect temperature is 165～170 ℃, and soaking time is 2.5～3 hours.

Embodiment three: in the present embodiment, step 1 interalloy ingot casting is heated to 452 ℃, and Si is 12.5% in the weight percent of described alloy cast ingot, Fe is 0, and Cu is 1.0%, and Mn is 0.10%, Mg is 1.0%, Ni is 1.0%, and Zn is≤0.1%, and Cr is 0.05%, Ti is 0, single impurity≤0.05% adds up to impurity≤0.15%, and all the other are Al; Quenching temperature is 522 ℃ in the step 3, and the soaking time of quenching is 235 minutes, and the temperature of quenching institute water is 52 ℃; The one-level aging temp is 142 ℃ in the step 4, and soaking time is 3.8 hours; The secondary time effect temperature is 166 ℃, and soaking time is 2.6 hours.

Embodiment four: in the present embodiment, step 1 interalloy ingot casting is heated to 452 ℃, and Si is 13% in the weight percent of described alloy cast ingot, Fe is 0.05%, and Cu is 1.2%, and Mn is 0, Mg is 1.2%, Ni is 1.2%, and Zn is 0.2, and Cr is 0, Ti is 0.1%, single impurity≤0.05% adds up to impurity≤0.15%, and all the other are Al; Quenching temperature is 524 ℃ in the step 3, and the soaking time of quenching is 245 minutes, and the temperature of quenching institute water is 58 ℃; The one-level aging temp is 144 ℃ in the step 4, and soaking time is 4.2 hours; The secondary time effect temperature is 168 ℃, and soaking time is 2.8 hours.

Claims

1, the manufacture method of aluminium-alloy piston, it is characterized in that it realizes by following step: one, columned alloy cast ingot is heated to 450～470 ℃, Si is 11.5%～13.5% in the weight percent of described alloy cast ingot, Fe is≤0.10%, and Cu is 0.5%～1.3%, and Mn is≤0.20%, Mg is 0.8%～1.3%, Ni is 0.5%～1.3%, and Zn is≤0.25%, and Cr is≤0.10%, Ti is≤0.15%, single impurity≤0.05% adds up to impurity≤0.15%, and all the other are Al; Two, by cutting off after the extruding, make rough forging; Three, woolen cloth quenches behind free forging and die forging; Four, carry out ageing treatment.

2, the manufacture method of aluminium-alloy piston according to claim 1 is characterized in that step 1 interalloy ingot casting is heated to 452 ℃, and Si is 11.7% in the weight percent of described alloy cast ingot, Fe is 0.02%, and Cu is 0.7%, and Mn is 0.05%, Mg is 0.9%, Ni is 0.7%, and Zn is 0, and Cr is 0.01%, Ti is 0.02%, single impurity≤0.05% adds up to impurity≤0.15%, and all the other are Al; Quenching temperature is 520～525 ℃ in the step 3, and the soaking time of quenching is 230～250 minutes, and the temperature of quenching institute water is 50～60 ℃; The one-level aging temp is 140～145 ℃ in the step 4, and soaking time is 3.5～4.5 hours; The secondary time effect temperature is 165～170 ℃, and soaking time is 2.5～3 hours.

3, the manufacture method of aluminium-alloy piston according to claim 1 is characterized in that step 1 interalloy ingot casting is heated to 452 ℃, and Si is 12.5% in the weight percent of described alloy cast ingot, Fe is 0, and Cu is 1.0%, and Mn is 0.10%, Mg is 1.0%, Ni is 1.0%, and Zn is≤0.1%, and Cr is 0.05%, Ti is 0, single impurity≤0.05% adds up to impurity≤0.15%, and all the other are Al; Quenching temperature is 522 ℃ in the step 3, and the soaking time of quenching is 235 minutes, and the temperature of quenching institute water is 52 ℃; The one-level aging temp is 142 ℃ in the step 4, and soaking time is 3.8 hours; The secondary time effect temperature is 166 ℃, and soaking time is 2.6 hours.

4, the manufacture method of aluminium-alloy piston according to claim 1 is characterized in that step 1 interalloy ingot casting is heated to 452 ℃, and Si is 13% in the weight percent of described alloy cast ingot, Fe is 0.05%, and Cu is 1.2%, and Mn is 0, Mg is 1.2%, Ni is 1.2%, and Zn is 0.2, and Cr is 0, Ti is 0.1%, single impurity≤0.05% adds up to impurity≤0.15%, and all the other are Al; Quenching temperature is 524 ℃ in the step 3, and the soaking time of quenching is 245 minutes, and the temperature of quenching institute water is 58 ℃; The one-level aging temp is 144 ℃ in the step 4, and soaking time is 4.2 hours; The secondary time effect temperature is 168 ℃, and soaking time is 2.8 hours.