CN101709366B - Heat treatment method for improving mechanical property of thin-wall case aluminium alloy castings - Google Patents

Abstract

The invention discloses a heat treatment method for improving the mechanical property of thin-wall case aluminum alloy castings, belonging to the heat treatment method of nonferrous metal, and aiming at providing a heat treatment method for improving the mechanical property of thin-wall case aluminum alloy castings. The method comprises two steps of a quenching technology and an ageing treatment technology: heating the furnace to the quenching temperature from below 300 DEG C after a casting is placed into a quenching furnace, and keeping the temperature conventionally, taking out the casting from the furnace and quenching; heating an ageing treatment furnace to 150+/-5 DEG C from room temperature after the casting is placed into the ageing treatment furnace, keeping the temperature for 4+/-0.5h, and taking out the casting from the furnace to be cooled. Each mechanical property index of the aluminum alloy casting treated by the invention is utilized, thus not only the requirement of GB/T117-1995 can be completely achieved, but also the special requirement of users to the distortion amount of the torque force can be satisfied.

Description

Improve the heat treating method of mechanical property of thin-wall case aluminium alloy castings

Technical field: the present invention relates to a kind of method that nonferrous materials is heat-treated, relate in particular to a kind of method that aluminum alloy casting is heat-treated.

Background technology: the RRU communication equipment is the distributed base station equipment that is widely used in the network of communication, its shell is that the aluminium alloy casting of ZL116 forms by code name normally, belong to the thin-walled shell class part of structure more complicated, mainly be installed in-60 ℃～60 ℃ open air; Since the long term operation of RRU communication equipment in rugged environment relatively and deadweight bigger, therefore require foundry goods must have stronger salt fog resistance corrosive power and higher mechanical properties.Yet,, can not satisfy the requirement of foundry goods working load because the mechanical property of aluminum alloy casting when as cast condition is generally lower; And when adopting gravity casting method casting parts of thin-wall casing, and adopt the prior heat treatment method that part is heat-treated (promptly according to the determined cast aluminium alloy heat treatment regime of standard GB/T1173-1995), but do not reach the mechanical performance index of GB/T1173-1995 defined, can not satisfy the particular requirement of user simultaneously part torsion experiment deflection.

Summary of the invention: at the above-mentioned defective that exists in the prior art, the present invention aims to provide a kind of heat treating method that improves mechanical property of thin-wall case aluminium alloy castings, utilizes this method to make and adopts the mechanical property of the aluminium alloy thin-walled shell-pieces of ZL116 of gravity casting method casting to be improved significantly.

To achieve these goals, the present invention is by the following technical solutions: it comprises quenching technology and aging treatment process two big steps, and detailed process is as follows:

1) quenching furnance of according to a conventional method foundry goods being packed into, the gap that keeps 20～25mm between control foundry goods batch≤90%, foundry goods and the foundry goods;

2) by the heat-up rate of 100 ℃/h with the temperature of quenching furnance from being heated to predetermined quenching temperature below 300 ℃, processing requirement insulation for some time routinely then;

3) the foundry goods quenching of coming out of the stove, the transfer time≤15S that quenches, quenchant is 80～100 ℃ a water;

4) foundry goods after method set by step 1) will be quenched is packed in the aging oven;

5) heat-up rate routinely rises to 150 ± 5 ℃ with aging oven from room temperature, insulation 4 ± 0.5h; The foundry goods cooling of coming out of the stove.

Compared with the prior art, therefore the present invention has improved foundry goods metallographic structure performance owing to adopted technique scheme, not only increased substantially foundry goods mechanical property, satisfied the particular requirement of user to the torsion deflection, but also reduced energy consumption.Be to adopt the determined cast aluminium alloy heat treatment regime of GB/T1173-1995 and the inventive method respectively 100 RRU communication equipment shells to be heat-treated one group of obtained mechanical property test mean value below:

Table 1: adopt two kinds of methods to heat-treat the mechanical property correlation data of back foundry goods

Above-mentioned evidence, after employing the inventive method was heat-treated RRU communication equipment shell, every mechanical performance index of foundry goods can reach the requirement of GB/T1173-1995 fully, and can also satisfy the particular requirement of user to the torsion deflection.

Embodiment: following is example with RRU communication equipment shell, and the invention will be further described in conjunction with specific embodiments, and detailed process is as follows:

1) quenching furnance of according to a conventional method foundry goods being packed into, the gap that keeps 20～25mm between control foundry goods batch≤90%, foundry goods and the foundry goods;

2) by the heat-up rate of 100 ℃/h with the temperature of quenching furnance from being heated to determined 535 ± 5 ℃ of national standard below 300 ℃, then by this national standard insulation 10～14h;

3) the foundry goods quenching of coming out of the stove, the transfer time≤15S that quenches, quenchant are 80～100 ℃ water;

4) foundry goods after method set by step 1) will be quenched is packed in the aging oven;

5) heat-up rate routinely rises to 150 ± 5 ℃ with aging oven from room temperature, insulation 4 ± 0.5h; The foundry goods cooling of coming out of the stove.

Claims (1)

1. a heat treating method that improves thin-wall case class ZL116 aluminum alloy casting mechanical property comprises quenching technology and aging treatment process two big steps, it is characterized in that detailed process is as follows:

1) quenching furnance of according to a conventional method foundry goods being packed into, the gap that keeps 20～25mm between control foundry goods batch≤90%, foundry goods and the foundry goods;

2) by the heat-up rate of 100 ℃/h with the temperature of quenching furnance from being heated to quenching temperature below 300 ℃, processing requirement insulation routinely then;

3) the foundry goods quenching of coming out of the stove, the transfer time≤15S that quenches, quenchant is 80～100 ℃ a water;

4) foundry goods after method set by step 1) will be quenched is packed in the aging oven;

5) heat-up rate routinely rises to 150 ± 5 ℃ with aging oven from room temperature, insulation 4 ± 0.5h; The foundry goods cooling of coming out of the stove.