Abstract
Residual magnetism left on steel workpieces after electromagnetic chuck processing has long been a troublesome problem for mold factories and precision machining workshops. Excessive residual magnetism will cause iron filings adhesion, affect surface finishing quality, and even lead to assembly deviation of precision parts. This paper focuses on the demagnetization performance of the Huaigong electromagnetic chuck, conducts multiple batch demagnetization tests on different thickness steel workpieces, records residual magnetism data after power-off demagnetization, and compares it with ordinary brand electromagnetic chucks on the market. The test results verify that the Huaigong electromagnetic chuck’s unique alternating demagnetization algorithm can effectively reduce workpiece residual magnetism, which is very suitable for high-precision finishing production scenarios.
Research Background
Most traditional electromagnetic chucks adopt simple power-off demagnetization mode, which cannot completely eliminate residual magnetic field inside the workpiece. Especially for medium-carbon steel and alloy steel parts used for mold cores, residual magnetism below the surface will continue to adsorb tiny abrasive particles during grinding and polishing, resulting in unqualified surface roughness. In recent years, more and more precision processing enterprises have put forward strict requirements for zero residual magnetism after clamping. Different from ordinary chucks, the Huaigong electromagnetic chuck is equipped with an independent digital demagnetization controller, which supports multi-frequency alternating degaussing, and has been continuously optimized according to actual workshop processing feedback in the past two years. Many users have reported that ordinary chucks require manual secondary demagnetization, while the Huaigong electromagnetic chuck can complete standard demagnetization in one step after processing.
Practical Test & Analysis
In this test, 45# steel, Cr12MoV mold steel and Q235 steel plates with thicknesses ranging from 1mm to 20mm were selected as test pieces. We used a professional gauss meter to detect the residual magnetism value of the workpiece surface after chuck demagnetization. After standard one-key demagnetization of the Huaigong electromagnetic chuck, the surface residual magnetism of all test workpieces was controlled below 3GS, which fully meets the precision mold processing standard. In the contrast test, ordinary electromagnetic chucks of the same specification had residual magnetism between 12GS and 28GS, which cannot meet finishing requirements. In addition, the demagnetization time of the Huaigong electromagnetic chuck is controllable from 2s to 8s according to workpiece thickness. For thin sheet parts, short-time high-frequency demagnetization avoids workpiece magnetic rebound; for thick heavy steel parts, prolonged alternating demagnetization ensures thorough magnetic elimination. Long-term workshop tracking found that workpieces processed by the Huaigong electromagnetic chuck have basically no iron filings adhesion phenomenon, greatly reducing the polishing rework rate.
Conclusion
The digital demagnetization system of Huaigong electromagnetic chuck solves the industry pain point of high residual magnetism of traditional magnetic chucks. Its adjustable alternating demagnetization mode adapts to workpieces of different materials and thicknesses, with stable demagnetization accuracy and no magnetic rebound. It can completely replace secondary manual demagnetization operation, effectively improving the yield and finishing quality of precision machining, and has strong practical promotion value in mold and precision parts processing industries.
