A part of textile machinery CT267X high-speed dobby device. Its material is 45 steel. The inner diameter of a hole with a diameter of 20mm requires quenching and strengthening with a high-frequency induction heating machine. The depth of the quenching layer is 0.8-1.0mm and the hardness is 50-60HRC. During production, it was found that high-frequency induction heating and quenching of small holes with a diameter of 20mm is difficult. On the one hand, conventional inner hole sensors are difficult to make and are more difficult to set as conductors; on the other hand, whether water is sprayed through the sensor or a special water spray jacket is used, The cooling method has poor quenching and cooling effect on the workpiece. The hardness of the inner hole is uneven and cannot meet the technical requirements.
The high-frequency induction heating quenching of the workpiece used an inner spiral inner hole quenching inductor. The inductor is wound with a 4MM diameter pure copper tube, with an outer diameter of 16mm, a pitch of 7mm, and a total of 3 turns. It is cooled by flowing water. . During use, it was found that the inductor was not only difficult to make, but also had poor cooling water flow, resulting in uneven heating temperatures, watering for cooling after quenching and heating, difficulty in synchronizing power outages and watering, insufficient cooling water, slow cooling of the workpiece, and structural transformation. Incomplete, because the workpiece has uneven hardness after quenching and cannot meet the technical requirements.
After that, the spiral wire inductor submerged water quenching process test was carried out. During high-frequency induction heating, the surface temperature of the workpiece increases, and the surrounding water is vaporized to form a stable vapor film surrounding the workpiece, which isolates the workpiece from the flowing cooling water. The steam film has poor thermal conductivity and plays an insulating and protective role. The temperature of the workpiece quickly rises to the quenching temperature and is quenched. At this time, the power is turned off, the steam film on the surface of the workpiece breaks, the workpiece is rapidly cooled by the flowing cooling water, the structural transformation is completed, and the surface of the workpiece is hardened. The test results are as follows: the inner diameter hardness of the inner hole is 55-63HRC, the quenching layer depth is 1.0-1.5mm, the hardness is evenly distributed, the hole shrinkage is about 0.015-0.03mm, the deformation is small, and the technical requirements are met. The production efficiency is 200 pieces/h. .
Conduct experiments to improve process methods and apply them in production. The workpiece quality is excellent, the process is stable and reliable, and meets the technical requirements.
Things to note during production are as follows:
1. The heating effect is better if the diameter of the steel wire is 2mm, while other types are easy to burn out.
2. Since the steel wire is thin and has low rigidity, the pitch cannot be too small, otherwise they will easily contact each other and cause a short circuit after being powered on. However, if the pitch is too large, the heating will be uneven and the hardness of the hardened layer will be uneven. The ownership is related to the thickness of the workpiece. If there are too few turns, the hardness of the hardened layer will be uneven. If there are too many turns, the sensor impedance will be large and the heating effect will decrease. The pitch and ownership of the inductor should be selected appropriately to achieve better quenching performance.
3. The copper wire of the sensor is thin and has poor rigidity. It will vibrate under the action of the magnetic field after being energized. In order to prevent the sensor from vibrating and causing the lighter to burn out, a sensor reinforcement device is designed to reduce the vibration.
en 
cn 
jp 
ko 
de 
es 
it 
ru 
pt 
vi 
th 
pl 
GS-ZP-1200
