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The technical points of automatic lathe machining stainless steel

Article source:CNC machiningResponsible editor:adminauthor:Kang Ding hardwarePopularity: Publication time:2017-04-12 15:57 font size:【 large middle Small
The technical points of automatic lathe machining stainless steel

  1, stainless steel processing tools for the basic requirements

  Requirements for geometric parameters of cutting tools

  Improving the surface finish of the cutting part can reduce the resistance of chip formation and improve the durability of the cutting tool. Compared with ordinary steel processing, processing of stainless steel should be appropriate to reduce the amount of cutting to reduce tool wear; at the same time to choose appropriate lubricant, in order to reduce the cutting heat and cutting force in the cutting process, prolong the service life of the cutter.

  Requirements for tool rod materials

  Stainless steel, due to the larger cutting force, so the knife must have sufficient strength and rigidity, so as not to occur in the process of cutting chatter and deformation. This requires the use of an appropriate large cross-sectional area of the cutter, but also the use of high strength materials to make the knife rod, such as the use of quenching and tempering treatment of 45 steel or steel No. 50.

  Requirements for cutting tool parts

  When machining stainless steel, it is required that the cutting part of the tool has a high wear resistance, and can maintain its cutting performance at a high temperature. At present, the commonly used materials are: high speed steel and cemented carbide. Because of the high speed steel can only be maintained at 600 degrees below C cutting performance, it is not suitable for high-speed cutting, but only for low speed processing of stainless steel. Because the cemented carbide has better heat resistance and wear resistance than the high speed steel, the cutting tool made of cemented carbide material is more suitable for the cutting of stainless steel.

  When machining stainless steel, the geometry of the cutting part of the cutting tool should be considered in the selection of the front and back angles. In the selection of the front angle, to consider the roll groove type, there is no chamfer and edge angle of the positive and negative angles and other factors. No matter what kind of cutting tools, stainless steel must be used when the larger rake angle. Increasing the rake angle of the tool can reduce the resistance in the chip cutting and cleaning process. The selection of the rear angle is not very strict, but not too small, the rear angle is too small and easy to produce a serious surface friction, so that the surface roughness of the deterioration of the tool wear. And because of the strong friction, enhance the effect of surface hardening stainless steel; cutting angle should not be too large, after the angle is too large, so that the tool wedge angle decreases, reducing the cutting edge strength, accelerate the wear of cutting tool. Generally, the rear angle should be larger than the ordinary carbon steel.

  2, the choice of geometric parameters

  Choose the angle after the rough machining, strong cutting tool on the cutting edge of the requirements of high strength, should take the small angle after finishing; when the tool wear occurs mainly in the cutting edge and the flank area, for the stainless steel prone to work hardening of the material, then the knife surface friction on the larger the machined surface quality and the effect of tool wear, the reasonable angle should be: the processing of austenitic stainless steel (185HB), followed by a desirable angle of 6 DEG ~8 DEG; processing of martensitic stainless steel (above 250HB), followed by the angle of 6 DEG ~8 DEG; processing of martensitic stainless steel (250HB), followed by the angle of 6 DEG ~10 DEG is appropriate. The size and direction of the inclination angle of the cutting edge of the cutting edge, the direction of the chip flow is determined, and the ~20 of the edge angle of the blade is ls, which is usually suitable for -10 deg. In the micro fine car outside the circle, fine car hole, fine plane plane, should use a large blade angle cutter: should take LS45 degrees ~75 degrees. 4 the choice of cutting parameters in order to suppress the formation of the chip and the scale of thorns, improve the surface quality, the use of carbide cutting tools for processing, cutting the amount of carbon steel than the work of turning a little lower, especially

  Cutting speed should not be too high, generally recommended cutting speed of Vc=60~80m/min, cutting depth of ap=4~7mm, feed f=0.15~0.6mm/r is appropriate.

  Before the selection of angle and heat generated from the cutting heat side, can reduce the cutting heat generated increases the rake angle, cutting temperature is not too high, but the angle is too large for the cutter head cooling volume decreases, the cutting temperature increased. Reducing the rake angle can improve the heat dissipation condition of the cutter head, the cutting temperature may be reduced, but the front angle is too small, the cutting deformation is serious, and the heat generated by the cutting is not easy to disperse. The practice shows that the ~20 angle of go=15 degrees is the most suitable.

  3, the choice of tool material

  The cutting performance of the cutting tool material is related to the durability and productivity of the cutting tool. Should choose high hardness, good toughness and anti caking tool materials, such as YG kind of hard alloy, it is best not to use YT hard alloy, especially in austenitic stainless steel 1Gr18Ni9Ti should absolutely avoid selection of YT hard alloy, stainless steel because of titanium (Ti) and YT hard alloy Ti Pro role of chip to the Ti in the alloy to wear away, cutting tool. The production practice shows that the choice of YG532, YG813 and YW2 three grades of stainless steel has good processing effect.

  Requirements for surface roughness of cutting tool

  Tungsten carbide cobalt alloy (YG) and tungsten cobalt titanium alloy (YT) two categories. Tungsten cobalt alloy with good toughness, made the cutter can be grinded by relatively sharp edge angle and blade large, in the process of cutting chip deformation, cutting easy, not easy to stick a knife cutting, so in general, with tungsten cobalt alloy suitable for processing stainless steel. Especially in the vibration of the coarse and intermittent cutting processing should be more than the use of tungsten cobalt alloy blade, it is not as hard and brittle as tungsten cobalt titanium alloy, not easy to grind, easy to collapse. Tungsten cobalt titanium alloy has better red hardness and wear resistance than tungsten cobalt alloy at high temperature, but its brittleness is large, and it is not resistant to impact and vibration.

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