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High frequency quenching of high speed steel super Feng electrical three tips
High frequency quenching of high speed steel superFeng electrical trick
Quenching heating temperature, high speed steelquenching temperature selection: from the increase in quantity, improve carbide into Austenitic Alloy’s perspective, the austenitizing temperature, the higher the better, in order to increase the wear resistance of steel and red hardness. But from thegrain, strength perspective, with the increase of austenitizing temperature, grain coarsening steel,after reaching a certain limit, after reaching acertain limit, strength and toughness of steel willfall. And there is a close relationship betweenthese two aspects and the tool life, so the choice of quenching temperature correctly, has greatinfluence on the service life of the tool. With the increase of heating temperature high frequencyquenching furnace, carbide continuously into thematrix, high speed steel, steel residual carbidescontinue into, Henan Feng electrical equipmentlimited company for the matrix of high speed steel,the number of residual carbides in steel decreased continuously. From the perspective of alloying, hope to improve the quenching temperature, the carbidedissolve into the matrix as much as possible. But with the increase of quenching temperature, the grain size of steel grew up. As the grain sizedecreases, the strength of steel, increased brittleness. Effect of grain size on the tool lifesituation is more complex, the discontinuous cuttingtools, the influence law is significant, and the finer the grain size, the higher the tool life. Thismay bear a certain impact and discontinuous cuttingtool cutting tool, has high toughness about. Thecontinuous cutting tools, grain size on the cutting tool life, some test data, but the opposite conclusion.
Cutting tools of different types, different specifications, different conditions of use, choose the quenching furnace temperature is the carbidesolubility and grain size control to the best state,so that the wear resistance, toughness, red hardnessand good cooperation, so as to get the best toollife. The cutting force is small, bearing the bruntof small tools, such as quenching temperature toolshould choose higher. The heavy load, discontinuous cutting tool bear greater impact quenching heating temperature should be selected high. The heavy load,discontinuous cutting tool bear greater impactshould choose the quenching temperature low. In order to prevent the complex shape and slender, thin and tough tool quenching crack quenching distortionand reduce, should adopt the quenching temperatureslightly lower. The factory can choose quenching heating temperature under conditions of use in the manufacture of their own tools. As a tool in cuttingdifficult to machine materials or in high speed and small amount of feed of the cutting conditions,should choose the quenching temperature slightly higher. If cutting large impact force or equipmentvibration should choose the quenching temperatureslightly lower. May be necessary to determine the optimum quenching temperature some tools in theplant specific conditions of use by cutting test.
High frequency quenching of high speed steel superFeng Electrical key two
Quenching heating time, heating time of high-speed steel tool with effective thickness is heating coefficient tool to calculate. The heatingcoefficient is calculated to shoulder heatingheating time basis, in the actual production of a lot of charging, consideration must be given to theheating furnace type, structure, power, clampingsize, preheating and other factors to determine the final heat insulation time. High speed steelquenching, to achieve the dissolution of carbiderelatively full, get a higher degree of AusteniteFormation, quenching heating temperature and holding time are important, but the temperature of thegreater role.
High frequency quenching of high speed steel superFeng Electrical key three
Cooling of high speed steel must be sufficient to ensure that the cooling rate during cooling no carbide precipitation from a saturated austenite inquenching, so as not to reduce the austenitic alloy,reduce the hardness after quenching red, or even reduce the quenching hardness. If the quench coolingprocess of carbide along the grain boundaries, it will reduce the toughness of the steel. The quenching cooling method of high-speed steel tool for heating in salt bath is mostly used in salt bathquenching. Small size tools can be cooled by air.Tool requirements such as high red hardness toolcommonly used oil cooling. With complex shape, large tool or quenching distortion requirements more stringent tool by austempering. The cooling temperature quenching usually 550 or 600 degrees Celsius, quenching holding time and quenchingheating equipment heat preservation time is the same. When the quenching temperature more than 650 degrees Celsius will make the cutting life ofdiscontinuous cutting tool down, this is because thegraded temperature is too high, stay in the process of classification of carbide precipitates along the grain boundaries, reduce the toughness of steel. So the discontinuous cutting tools, quenchingtemperature to no more than 650 degrees Celsius for good. The continuous cutting tools, due to very small impact cutting, is not high on the toughness requirements, thus improving graded temperature can increase the precipitation of carbides, but the effect on the cutting tool life is not significantly more quenching for enquiry please call 159-9369-2891engineering consulting the article written byhttp://www.cfjrsb.com/2