Surface burning of the induction quenching is often a major defect that causes workpiece scrap, so it is necessary to prevent it. . GuangYuan · GuangZhiYuan has also analyzed the local grunge problem of induction quenching parts, and organizes relevant precautions to help us better production.
1. Sensor's effective ring and workpiece clearance are too small if the active ring of the inductor is too small, and the short circuit is generated during heating, the surface is burned, and the preventive measures are as follows:
(1) The insulative temperature resistant material is applied to the active ring. It used to apply a enamel layer. Now it is improved to spray alumina or coated other high temperature resistance materials, such as Polyfiber sleeve, high silicon oxygen web, etc.
(2) Insulation of the heating workpiece and the active ring, such as the workpiece positioned on top of the insulating sleeve, etc., the workpiece even does not generate a burnt.
(3) Enhance the rigidity of the active ring, there is no vibration due to the action of electromagnetic force, and the gap is changed.
(4) Install the interval positioning block, such as a spacing positioning block on the crankshaft sensor, ensuring that the effective ring does not contact the workpiece, and the positioning block is preferably made of temperature, anti-impact, and cold-resistant materials.
(5) Install the ground fault breaker. The modern inductive quenching machine is installed on a ground fault shutdrope safety device, and when the workpiece is burned. When inductive heating, low power density can reduce the burnt.
2. Casting defect castings (such as shrinkage, loose, inclusions, etc.) often cause the induction current to be partially concentrated, causing the workpiece to be burned. When inductive heating, low power density can reduce the burnt.
3. Improvement of workpiece design to avoid ribs, sharp corners, chamfers, small holes and thickness, etc., thereby avoiding local eddy currents.
4. Improve the effective ring design such as partial amplification gap, partially back to the magnet, shield plate, etc.