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Heat treatment method for cast aluminum alloy gearbox

A technology of casting aluminum alloy and heat treatment method, which is applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as plasticity decline, strength not reaching an ideal high value, internal stress removal and aging strengthening cannot achieve ideal results at the same time, etc. , to achieve the effect of low quenching water temperature, large aging strengthening effect, and improving comprehensive mechanical properties

Inactive Publication Date: 2018-12-14
ZHUZHOU JIUZHOU TRANSMISSION MACHINERY
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  • Abstract
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Problems solved by technology

At present, the post-casting heat treatment methods of the two are solution treatment and aging treatment, but there is a problem that the removal of internal stress and aging strengthening cannot achieve the desired results at the same time: if the full aging treatment is carried out to fully remove the internal stress, the plasticity will drop significantly. Incomplete aging treatment can not fully remove the internal stress and the strength can not reach the ideal high value

Method used

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  • Heat treatment method for cast aluminum alloy gearbox

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Effect test

Embodiment 1

[0028] as attached figure 1 Shown, a kind of heat treatment method of casting aluminum alloy gearbox, comprises the following steps:

[0029] A1: The cast aluminum alloy gearbox is firstly subjected to solution treatment, the solution treatment temperature is 535°C, and the holding time is n 1 hours, where n 1 It is equal to dividing the maximum wall thickness of the gearbox by 25 mm and then adding 1. In this embodiment, the maximum wall thickness of the gearbox is 65 mm. Dividing by 25 mm equals 2.6, and the heat preservation is 3.6 hours;

[0030] B1: Immediately put the gear box into the water after the solution treatment, the transfer time is not longer than 25s, and the quenching temperature is 65°C;

[0031] C1: Immediately after quenching, transfer it into the furnace for aging treatment. The aging temperature is 205°C. The temperature rise rate in the furnace for aging treatment is not greater than 50°C. After holding time for 8 hours, it is out of the furnace and a...

Embodiment 2

[0035] as attached figure 1 Shown, a kind of heat treatment method of casting aluminum alloy gearbox, comprises the following steps:

[0036] A2: The cast aluminum alloy gearbox is subjected to solution treatment first, the solution treatment temperature is 538°C, and the holding time is n 1 hours, where n 1 Equal to the maximum wall thickness of the gearbox divided by 25 mm and then add 1. In this embodiment, the maximum wall thickness of the gearbox is 65 mm, divided by 25 mm equals 2.6, then the heat preservation is 3.6 hours;

[0037] B2: Immediately put the gearbox into water after the solution treatment, the transfer time is not longer than 25s, and the quenching temperature is 62°C;

[0038] C2: Immediately after quenching, it is transferred into the furnace for aging treatment. The aging temperature is 175°C. The existing aging treatment temperature is the incomplete aging temperature or the complete aging temperature. The temperature of the present invention is betw...

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Abstract

A heat treatment method for a cast aluminum alloy gearbox comprises the following steps that A, solid solution treatment is carried out on the cast aluminum alloy gearbox, wherein the temperature of solid solution treatment is 530-540 DEG C, the heat preservation time is n1 hours, and n1 is equal to the value obtained after dividing the largest wall thickness by 25 mm and then plus 1; B, after solid solution treatment is finished, water is immediately added into the gearbox, wherein the duration is not longer than 25 s, and the quenching temperature is 60-70 DEG C; C, after quenching is finished, the gearbox is immediately transferred into a furnace for ageing treatment in the two following modes, wherein the ageing temperature is 200-210 DEG C, and gearbox is taken out of the furnace forair-cooling after 7-9 hours of heat preservation; the ageing temperature is 170-180 DEG C, the heat preservation time is n2 hours, n2 equals to the value obtained after dividing the largest wall thickness by 25 mm and then plus 2, and vibration aging treatment in the cooling process is immediately carried out after the gearbox is discharged from the furnace. According to the method, internal stress can be fully removed while ideal high comprehensive mechanical performance is achieved, so that the structure and size of the gearbox are stable, and deformation of the subsequent finish machining size and precision cannot be caused.

Description

technical field [0001] The invention relates to a heat treatment method of a cast aluminum alloy, in particular to a heat treatment method of a cast aluminum alloy gear box. Background technique [0002] Aluminum alloy has low density, but relatively high strength, which is close to or surpasses high-quality steel. It has good plasticity, good processing performance, excellent electrical conductivity, thermal conductivity and corrosion resistance. It is widely used in industry, and its usage is second only to steel. The vast majority of aluminum alloys can obtain good mechanical properties, physical properties and corrosion resistance after heat treatment, especially the ratio of strength to specific gravity of aluminum alloys is better than that of many alloy steels, making them ideal structural materials and widely used in machinery manufacturing and transportation Machinery, power machinery and aviation industry, etc. [0003] Aluminum alloys also have good castability. ...

Claims

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Application Information

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IPC IPC(8): C21D9/00C22F1/043
CPCC21D9/0068C22F1/002C22F1/043
Inventor 刘波
Owner ZHUZHOU JIUZHOU TRANSMISSION MACHINERY
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