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 Θέμα :Square flange sintered bronze bushing oilless bearing Manufacturer..
Πέμπτη, 22 Μάρτιος 2018 
slidebearing
Junior
Συμμετοχή από: 2018-03-16 06:39:18
Καταχωρήσεις: 10
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the bearing ring heat treatment study and application of new technology


The cooling capacity of quenching medium and hardening ability is an important factor affecting the quality of precision linear bearings ring heat treatment.Apparently and artifacts of metallurgical factors, the shape of the curve C on cooling and cooling conditions and so on.The cooling capacity of quenching medium, can make the work piece after quenching hardness higher or deeper hardening layer.In fact, the key of hardening is at the tip curve C cold speed should be enough big, but in martensitic transformation required cooling speed is relatively small.The application of new technology is adapted to this feature.By changing the workpiece and the relative speed of quenching oil, change the cooling of quenching medium and hardening ability, satisfy the workpiece formed under different temperature requirements of different cooling rate, thus obtain ideal quenching quality.


1. Cooling strength test analysis


Analysis after many experiments show that the new process change cooling mode,
Square flange sintered bronze bushing can improve the oil cooling intensity, thus improve the quality of heat treatment.The parameters of the cooling intensity H is the ability to reflect the cooling medium, H = alpha lambda / 2 (alpha as the interface heat transfer coefficient; lambda thermal conductivity of steel).Static water H value is 0.1.The more the cooling capacity of the H value, the greater the medium.In the experiment, according to quenching medium under the condition of different agitation, cooling intensity changes are shown in table 1, with strong stirring oil quenching, H value can reach 0.7, usually oil quenching H value is 0.3.


2. The organization analysis and hardness test


Ring in the process of testing the product model at 314/01, quenching temperature is 840.40 ℃, machine oil, coolant for 10 ring in static quenching and cooling conditions, through many experiments, it is concluded that ring troostite level changes in the microstructure, ring in static and dynamic cooling conditions, organization closely size differ about 5 ~ 10 times, under the condition of channeling dynamic cooling, fell to 0.5 hardness difference of the same race.

3. The application of new technology and equipment improvement


New technology is by changing the production facilities, the quenching oil and water jacket cooling circulation cooling, cooling with large flow pump the oil from the bottom of the quench tank after injection, to form the circulation under the funnel, uniform, again after a two layer oil column of orifice plate to form homogeneous swells up injection, boiled in oil tank are angled.And by changing the pump output flow, change the relative speed ring and oil, meet in the process of organization form to the requirement of different cooling rate, while the upper heat up the oil drain in time, make basic equilibrium in the oil tank, the lower the oil temperature.Not only makes the oil filter oil cooling system can fully cooling, and makes oil can get very good purification.New process which satisfies the requirement of GCr15 steel for high temperature cooling rate high request, to ensure the uniformity of quenching hardness and hardness, and can meet the workpiece under the low temperature austenitizing grain finer and low carbon, chromium content austenitic required critical quenching speed, refined martensite matrix organization, avoid quenching crack, the bearing ring quenching hardness stability control in HRC64 ~ 65.5, quenching microstructure of 2 ~ 3 grade.With 2 levels of multiple, outer diameter ¢above 100 mm ring diameter changes after quenching amount of super rate fell to about 7%, the workpiece surface after quenching brightness increased, the quality of all qualified, reduce the waste and loss of repair.


Production facilities improvement is hot quenching tank upper-middle-class oil overflow to the filtration unit, and then into a set of overhead of brass tube cooler in (place) in the cleaning cycle pool, and then after cooling in oil pump oil pump into the bottom of the quench tank, between two layers of aperture is ¢5 mm, pitch of 20 mm x 20 mm of porous plate, orifice on the second floor of a staggered,GE ES spherical plain bearing ensure uniform cooling oil on the rise.
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