Semiconductor Parts,Semiconductor Machine Parts,Cnc Semiconductor Processing Parts,Semiconductor Parts Machining Equipment Shenzhen Kairui Precision Technology Co., Ltd. , https://www.kailiseiko.com
Workpieces subjected to alternating loads such as torsion and bending require that the surface layer be subjected to higher stress or wear resistance than the core, and reinforcement requirements must be imposed on the surface of the workpiece. This is suitable for steels with a carbon content of We=0.40 to 0.50%.
Second, the process method
The combination of rapid heating and immediate quench cooling.
By rapid heating, the surface of the steel to be processed reaches the quenching temperature, and the unequal heat is rapidly cooled to the center, only the surface layer is hardened to martensite, and the center is still unquenched and the original plasticity and toughness are better (or positive). Fire and conditioning) organization.
Third, the main method:
Induction heating surface quenching (high frequency, intermediate frequency, power frequency), flame heating surface quenching, electrical contact heating surface quenching, electrolyte heating surface quenching, laser heating surface quenching, electron beam heating surface quenching.
Fourth, induction heating surface quenching
(a) The basic principle:
The workpiece is placed in an inductor wound in a hollow copper tube and an induction current of the same frequency is formed on the surface of the workpiece after passing through an intermediate frequency or high frequency alternating current, and the surface of the part is rapidly heated (800-800C in a few seconds). 1000 degrees, the heart is still close to room temperature) immediately after spraying water cooling (or oil quenching), so that the surface layer hardened. (As shown below)
1
(2) Selection of heating frequency The relationship between the depth δ (mm) of the induced current flowing into the surface of the workpiece at room temperature and the frequency f (HZ) is 2
As the frequency increases, the current penetration depth decreases and the harden layer decreases.
The commonly used current frequency is:
1, high frequency heating: 100 ~ 500KHZ, commonly used 200 ~ 300KHZ, for the electronic tube type high frequency heating, hardened layer depth of 0.5 ~ 2.5mm, suitable for small and medium-sized parts.
2, IF heating: current frequency is 500 ~ 10000HZ, commonly used 2500 ~ 8000HZ, power supply equipment for the mechanical IF heating device or SCR intermediate frequency generator. Hardened layer depth ~ 10 mm. Suitable for larger diameter shafts, medium and large gears, etc.
3, power frequency heating: current frequency is 50HZ. Mechanical power heating power supply equipment, hardened layer depth of up to 10 ~ 20mm, suitable for surface quenching of large diameter workpieces.
(C) Induction heating surface quenching applications:
Compared with ordinary heating quenching:
1, the heating speed is very fast, can expand the A body transition temperature range, shorten the transition time.
2, after quenching the surface of the workpiece can be obtained very fine cryptocrystalline martensite, hardness slightly higher (2 ~ 3HRC). Lower brittleness and higher fatigue strength.
3, the workpiece processed by the process is not easy to oxidize decarburization, and even some parts can be assembled directly after processing.
4, deep hardened layer, easy to control operation, easy to implement mechanization and automation.
Fifth, the flame surface heating quenching
Suitable for flame surface hardening of medium carbon steel 35, 45 steel and medium carbon alloy structural steel 40Cr and 65Mn, grey cast iron, alloy cast iron. It is a flame jet that uses the acetylene-oxygen or gas-oxygen mixture to rapidly heat the workpiece. After the surface of the workpiece reached the quenching temperature, spray cooling was performed immediately. Hardened layer depth of 2 ~ 6mm, otherwise it will cause the workpiece surface serious overheating and deformation cracking.
First, application: