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HPM75 non magnetic steel how to process
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Die characteristics of non-magnetic steel HPM75
Non-magnetic steel HPM75 is a Japanese HITACHI metal (HITACHI) brand, HPM series non-magnetic plastic die steel, free cutting plastic die steel; Aged up to 40-45HRC, non-magnetic high hardness stainless steel with the following magnetic steels
Features:
L Permeability (μ) =1.01, with non-magnetic and imported SUS304
L High hardness 40-45HRC can be obtained by aging treatment at 700℃*5h
L Good wear resistance, can be nitriding treatment.
No magnetic steel HPM75 application
HPM75 high hardness non-magnetic plastic plastic mold steel has the following uses:
L Magnetic plastics
L Abrasion resistant non-magnetic tools
Note: work hardening is easy to occur, and low speed machining is recommended.
Processing analysis of HPM75 non magnetic steel
HPM75 non-magnetic steel this special material because of its alloy composition contains a lot of alloy carbide, which makes the non-magnetic steel matrix strengthened. But our cutting machine processing used in the common drill and tool heat resistance, wear resistance is poor, hardness is relatively low.
When the cutting speed of the tool is low on HPM75 non-magnetic steel, the cutting bottom surface of the material and the cutting front surface of the tool form a new material surface with high chemical activity during the cutting process. Under the action of high temperature and high pressure, the material surface will produce chip flow. Chip flow is relatively stable on the surface of the material, but when vibration or load is not uniform during the cutting process, chip flow can fall off and cause tool wear. The chip flow beyond the edge will cut instead of the edge, which will leave marks on the surface of the finished material and affect the machining accuracy.
When HPM75 non-magnetic steel die parts are subjected to intense pressure and impact pressure in the process of drilling, the austenite structure of non-magnetic steel is easy to change into fine grain martensite, and the hardness of non-magnetic steel material is increased from the original 200HB (about 20HRC) to 550HB (about 55HC). Under the high temperature formed by friction and extrusion, the material surface is easy to form a high hard oxide layer (Mn2O3), but also makes the material thermal conductivity is very low (about 25% of S45C die steel), less heat emission. As a result, the bit is easy to anneal, resulting in cutting edge crushing, which affects tool life.
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