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 Θέμα :Plugged graphite bearing,plugged graphite bushing, graphite plugged br..
Πέμπτη, 22 Μάρτιος 2018 
slidebearing
Junior
Συμμετοχή από: 2018-03-16 06:39:18
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Θέμα :Plugged graphite bearing,plugged graphite bushing, graphite plugged bronze bushing

GCr15 steel bearing ring quenching quality of the process
The defect in the common one, bearing ring quenching cooling process


precision linear slides parts are widely used as a quenching medium, the main reason for GCr15 steel bushing is the third stage of the process of oil in the cooling phase (convection) special slow cooling rate.Production use of the past 10, 20, machine oil between 650 ~ 500 ℃ for 20 ~ 50 ℃ / s.Convection period starting around 300 ℃, continued to room temperature, as it happens and the martensite turn temperature requirements of the GEC radial spherical plain bearing smaller cooling speed, so that the bearing parts in the process of quenching deformation and cracking tendency is greatly reduced.But in the way of operation is manual hoist will ring into the oil, the oil ring in the upper and lower movement of frequency and amplitude is controlled by the operator manually, it is difficult to meet the technological requirements, namely the ring in oil dynamic time not less than 3 s/mm.Therefore, in the process of cooling ring often appear the following quality problems: 1) poor hardness uniformity: the same ring divergence HRC hardness > 2, the same ring uniform hardness HRC > 1 or 2.2) ring surface area soft point or local soft point.3) for effective wall thickness > 7 mm ring, microstructure of 45 # steel bushing organization in mesh troostite.


After the plugged graphite bearing,plugged graphite bushing, graphite plugged bronze bushing heat treatment quality analysis in 1998, because of the furnace for quenching cooling adverse to repair tin bronze bushing fire repair rate of 51.5%, ring in the cooling process of defects, and results in the decrease of bearing stiffness, strength, abrasion resistance and fatigue resistance performance degradation.
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