Table Mould Hardness Defects And Preventive Measures
The use of Table Mould(FURNITUREMOULD) is now very extensive. In order to improve the manufacturing process performance of table mould, the heat treatment process is usually carried out for the moulds. The common defects in heat treatment of the moulds are: quenching, deformation, poor hardness, electric machining cracking, grinding cracks, Early damage to the mould, etc. It can be seen that insufficient hardness of the table mould is one of the common types of defects.
What are the reasons for the lack of defects in the table mould and the preventive measures?
There are four main aspects:
1. The quenching temperature is too low. Mainly due to improper process setting temperature, temperature control system error, improper furnace installation or improper entry into the cooling tank, etc., the process temperature should be corrected, and the temperature control system should be repaired. When the furnace is installed, the workpiece spacing should be placed evenly and evenly. Slots are not allowed to be stacked or bundled into the trough for cooling.
2. The quenching temperature is too high. This is caused by improper process temperature setting or temperature control system error. The process temperature should be corrected and the photoelectric control shaft of the temperature control system should be overhauled.
3, over the temper. This is caused by the tempering temperature setting being too high, the temperature control system failure error or the furnace temperature is too high, and the furnace temperature should be corrected, and the inspection and temperature control system should be repaired.
4. Improper cooling. The reason is that the pre-cooling time is too long, the cooling medium is improperly selected, the quenching medium temperature is gradually increased, the cooling performance is lowered, the stirring is poor, or the bathing temperature is too high. Measures: quick release, slotting, etc.; master the cooling characteristics of quenching medium; oil temperature 60~80°C, water temperature below 30°C, when the table mould is quenched and the cooling medium is warmed, cooling quenching medium should be added or other The cooling bath is cooled; the agitation of the coolant is enhanced; the threaded grinding insert is taken out at Ms + 50 °C.