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Preparation before heat treatment (equipment: aluminum alloy solid solution (quenching) furnace):

 

1. Before heat treatment, check whether the heat treatment equipment, control system and instruments are normal.

 

2. Castings should be dry and free of oil stains, dirt, and explosives before being loaded into the furnace. Castings that have been treated should be classified according to the winning number, external dimensions, casting wall thickness, and heat treatment specifications. Different grades should not be mixed in the furnace.

 

3. Castings that are prone to warping in shape should be placed on a dedicated chassis or bracket, and there should be no suspended cantilever parts. Large castings should be individually placed on a dedicated bracket for furnace installation.

 

4. Single cast or auxiliary cast test bars for checking the performance of castings should be heat treated together with the parts in the same furnace to determine the performance of the castings.

 

 

Heating and insulation of T6 heat treatment equipment for aluminum alloy castings:

 

1. After heating to the set temperature, the temperature of each part of the furnace (± 2 ℃) should be checked and corrected at any time during the insulation period to prevent local high temperature or burning.

 

2. When the power outage cannot be restored for a short period of time, the castings in insulation should be quickly quenched and discharged from the furnace. After returning to normal, they should be loaded into the furnace, insulated, and subjected to heat treatment. The total insulation time should be slightly extended.

 

Discharge cooling:

 

1. After the insulation is completed, open the furnace door and lower the material basket to quickly drop the casting into the water tank, and quench it into the specified cooling medium for cooling.

 

2. The quenching transfer time refers to the total time from the casting being discharged from the furnace to the casting being fully quenched into the medium, which should not exceed 15 seconds.

 

 

Correction of casting deformation:

 

The deformation of castings should be corrected immediately after quenching, and the correction molds and tools should be prepared in advance before quenching.

 

2. Select the corresponding correction method based on the characteristics and deformation of the casting, and the force should not be too strong during correction, but should be slow and uniform.

 

Aging operation: (equipment: aluminum alloy aging furnace):

 

1. Castings that require artificial aging should undergo aging treatment as soon as possible within 0.5 hours after quenching. The quenched material basket can be directly pushed into the aging furnace, but the temperature of the product must not exceed the aging temperature.

 

2. Set the temperature of the automatic temperature control instrument, then power it on for heating and turn on the fan.

 

3. After the insulation time has expired, disconnect the power supply.