Tempering Of CNC Milling
The tempering treatment after CNC milling is usually similar to the tempering treatment after CNC Turning or other metal processing, which is a part of the heat treatment process aimed at improving the properties of the material. The following are clear steps and related information for tempering after CNC milling:
1. Determine the purpose of tempering
Determine the purpose of tempering based on the material, usage requirements, and technical standards of the workpiece, such as adjusting mechanical properties, reducing internal stress, stabilizing dimensions, etc.
2. Choose tempering temperature
Select the appropriate tempering temperature based on the material of the workpiece and the required performance.
Low temperature tempering (150-250 ℃): maintaining high hardness and wear resistance, suitable for tools, cutting tools, etc. of high carbon steel.
Medium temperature tempering (350-500 ℃): Obtaining high elasticity and yield point, suitable for springs, springs, etc.
High temperature tempering (500-650 ℃): Obtaining comprehensive mechanical properties with good strength, plasticity, and toughness, suitable for important load-bearing structural components such as connecting rods and bolts.
3. Prepare the tempering furnace
Ensure that the tempering furnace is in good working condition and clean the furnace to avoid contaminating the workpiece.
4. Heat the workpiece
Place the CNC Milling processed workpiece into a tempering furnace and heat it to the predetermined tempering temperature.
During the heating process, attention should be paid to controlling the heating rate to avoid cracks or deformation of the workpiece due to rapid temperature changes.
5. Insulation
After the workpiece reaches the predetermined temperature, maintain it for a certain period of time to fully transform the internal structure of the workpiece.
The length of insulation time depends on the material, size, and required performance of the workpiece.
6. Cooling
After the insulation is completed, remove the workpiece from the tempering furnace and slowly cool it.
During the cooling process, attention should be paid to controlling the cooling speed to avoid cracks or deformation of the workpiece due to excessive cooling.
7. Inspection and testing
After cooling, inspect the workpiece to ensure that there are no defects such as cracks or deformations.
Conduct mechanical performance tests as needed, such as hardness, strength, toughness, etc., to verify the tempering effect.
matters needing attention
Before tempering treatment, the surface of the workpiece should be cleaned to ensure that there are no pollutants such as oil stains and rust.
Select the appropriate tempering temperature and holding time based on the material and performance requirements of the workpiece.
Strictly control the temperature changes and speed during heating and cooling processes to avoid cracks or deformation of the workpiece.
During the tempering process, attention should be paid to safety protection measures to avoid accidents such as fires and burns.