【 Bearing Knowledge Points 】 The Various Reasons Why Bearings Run Laps?
【 Bearing knowledge points 】 The various reasons why bearings run laps?
PRODUCT
Die heat treatment process specification
by：Waxing
2020-10-03
Forging die and tire mold: quenching tempering furnace (1) immediately after the oil into the prepared.
Tempering (1) 5 crnimo back to heat the cold.
Note: (1) dovetail with self-made tempering.
Quenching process: small mold (
H≤250毫米)
All the oil '5' ~ 8 (
Medium and large oil '8 ~ 12')
Dovetail oil level is put forward, and then to reduce oil level is burned into oil again, again and again 2 ~ 3 times to dovetail tempering on its own.
Medium mould H = 250 ~ 400 mm, large mould H> 400 mm.
The oil temperature is 250 ~ 300 ℃, shall not be lower than 250 ℃, and preparing a 350 ~ 400 ℃ tempering furnace, immediately after the oil into the tempering furnace.
Blanking die quenching (1) 8 cr3, precooling temperature of 780 ℃ ~.
Tempering 3.
Die heat treatment considerations: (1) mold repair or renovation must first annealing to prevent cracking.
2 die quenching heating are to protect forging die, protect see diagram, other mold raw iron both application and drying of charcoal to protect its working face, in case of decarburization and will die cushion 50 ~ 100 mm.
(3) shall be promptly tempering after quenching.
(4) curve of the heat preservation time = mould height x heating coefficient (
Points/mm)
。
'Through' refers to the furnace to warm up to each color of workpiece and the duration of the chamber of a stove or furnace consistent color so far.
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