Common defects in the operation of the trolley furnace for heat treatment operations (quenching and tempering): The hardness is low or the cause of the defect in the soft block is as follows:
1. Quenching temperature is low, heating time is short
2. Preheating time is too short and preheating temperature is too low
3. A large number of furnaces, parts arranged too dense, there yin and yang
4. Raw material has severe graphitic carbon, or coarse granular carbides
5. Decarburization of raw materials or quenched heating decarburization
6. Quench cooling is slow, isothermal quenching is too hot or the temperature is too long
7. The tempering temperature is high, the tempering of the air furnace does not circulate, and the tempering is not sufficient
8. Different materials mixed, raw material decarburized layer is not removed
9. The furnace temperature is not uniform, the meter indicates that the value is not accurate
10. The workpiece is too shallow from the furnace surface or the workpiece is exposed to the following salt slag, so that the temperature is not uniform.
1. Strengthen raw material inspection, grinding sparks, and see spectral or laboratory components
2. Remove the decarburized layer of raw materials. Before the trolley furnace is heated, the oxygen is removed from the slag, and the air oven heating component is added with a protective agent (gas). It is best to use vacuum heating.
3. Correctly control the parameters such as temperature and time during the quenching and tempering process
4. Use a suitable quench medium
5. Water quenching - oil cooling water cooling time can not be too short
6. Familiar with heating furnace and instrument performance, master the error value
7. Check the hardness after quenching. How to deal with this defect:
1. If there is too much residual austenite, the hardness can be increased by cold treatment or tempered to increase the hardness value.
2. Reheat quenching, tempering
3. Cutting tools not exceeding the decarburized layer are treated as defective or waste products
Original article copyright belongs to Danyang Jiaheng Furnace Co., Ltd., please indicate the source
1. Quenching temperature is low, heating time is short
2. Preheating time is too short and preheating temperature is too low
3. A large number of furnaces, parts arranged too dense, there yin and yang
4. Raw material has severe graphitic carbon, or coarse granular carbides
5. Decarburization of raw materials or quenched heating decarburization
6. Quench cooling is slow, isothermal quenching is too hot or the temperature is too long
7. The tempering temperature is high, the tempering of the air furnace does not circulate, and the tempering is not sufficient
8. Different materials mixed, raw material decarburized layer is not removed
9. The furnace temperature is not uniform, the meter indicates that the value is not accurate
10. The workpiece is too shallow from the furnace surface or the workpiece is exposed to the following salt slag, so that the temperature is not uniform.
1. Strengthen raw material inspection, grinding sparks, and see spectral or laboratory components
2. Remove the decarburized layer of raw materials. Before the trolley furnace is heated, the oxygen is removed from the slag, and the air oven heating component is added with a protective agent (gas). It is best to use vacuum heating.
3. Correctly control the parameters such as temperature and time during the quenching and tempering process
4. Use a suitable quench medium
5. Water quenching - oil cooling water cooling time can not be too short
6. Familiar with heating furnace and instrument performance, master the error value
7. Check the hardness after quenching. How to deal with this defect:
1. If there is too much residual austenite, the hardness can be increased by cold treatment or tempered to increase the hardness value.
2. Reheat quenching, tempering
3. Cutting tools not exceeding the decarburized layer are treated as defective or waste products
Original article copyright belongs to Danyang Jiaheng Furnace Co., Ltd., please indicate the source
Sub-Control Box,Integration Led Dimmer,Led Dimmer Artnet Controller,Mini Lighting Led Dimmer
Shen zhen SH LED Technology Co.,Ltd , https://www.pixellightsolution.com