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Processing stainless tool requirements

Author : Xinrui Carbide Date : 2013/4/19 20:54:50
When processing stainless steel tool geometry parameters of the request, the geometry of the cutting portion of the tool, generally the front angle, back angle options to consider. To consider in the choice of the anterior horn on Chip groove, or without chamfer and the positive and negative edge inclination angle size and other factors. Whatever tool machining stainless steel must be larger rake angle. The increased tool rake angle can be reduced to chips cut from and cleared the resistance encountered by the process. On the posterior horn of the selection requirements are not very strict, but not too small, after the angle is too small and the workpiece surface is easy to generate serious friction surface roughness deterioration accelerated tool wear. And due to the strong friction, enhance the effect of hardening the surface of stainless steel; tool angle is not too large, after the angle is too large, so that the wedge angle of the tool is reduced, reducing the strength of the cutting edge, and accelerated wear of the tool. Typically, the posterior horn should be higher than the processing of ordinary carbon steel suitably large.

Improve the tool cutting part of the surface roughness of the cutting part of the tool surface finish to reduce the chip formation curled resistance, to improve the durability of the tool. In comparison with the processing of ordinary carbon steel, stainless steels should be appropriate to reduce the amount of cutting in order to reduce tool wear; also select the appropriate coolant in order to reduce heat and cutting force of the cutting process, the cutting tool life.

BAR material requirements when processing stainless steel, due to large cutting force, the BAR must have sufficient strength and rigidity, in order to avoid chatter and deformation occurs in the cutting process. This requires the selection of appropriate Arbor cross-sectional area, at the same time should also be used in high-strength materials to create Arbor, such as the use of quenched and tempered steel 45 or 50 gauge steel.

Requirements when processing stainless steel material on the tool cutting portion, the requirements of the cutting portion of the tool material having a high wear resistance, and can maintain its cutting performance at higher temperatures. The commonly used materials are: high-speed steel and carbide. As the cutting performance of high-speed steel can only be maintained below 600 ° C, it is not appropriate for high-speed cutting, but only to the low speed processing of stainless steel. Carbide than high speed steel having better heat resistance and abrasion resistance, stainless steel is more suitable for the cutting tool made of carbide materials.

Carbide sub-tungsten-cobalt alloy (YG) and tungsten-cobalt alloy (YT) two categories. Tungsten-cobalt alloy with good toughness tool made large rake angle and sharpening the sharp edge chip deformation in the cutting process, cutting light, the chip is not easy to stick the knife, so in general case, the tungsten-cobalt alloy processing stainless steel more appropriate. Especially in vibration roughing and interrupted machining should adopt tungsten cobalt alloy blade, it is not as hard and brittle like the tungsten-cobalt alloy, not grinding, chipping easy. Red hardness of tungsten-cobalt alloy is better than the tungsten-cobalt alloy wear under high temperature conditions, but it is more brittle, the impact of intolerance, vibration, usually stainless steel finish turning tool.

The anterior horn Select from cutting heat generation and cooling, increasing the rake angle can reduce the cutting heat generation, Buzhi Yu cutting temperature is too high, but the front is too large due to head cooling volume decreases, instead of cutting temperature increased. Reduced rake angle can improve the cooling conditions of the head, cutting temperature may decrease, but the rake angle is too small, the cutting severe deformation, not easily dissipate the heat generated by cutting. Practice shows that take rake angle go = 15 ° to 20 ° is the most appropriate.

Posterior horn of choice for roughing, powerful cutting tool cutting edge, high strength, you should take a smaller posterior horn; finishing, the tool wear occurs mainly in the cutting edge area and the flank face, stainless steel this prone to work-hardening material and subsequently flank friction impact, reasonable posterior horn of the machined surface quality and tool wear should be: machining austenitic stainless steel (185HB), subsequent angular desirable ° ~~ 8 °; processing martensitic stainless steel (250HB), followed by angle of 6 ° to 8 ° of; processing martensitic stainless steel (250HB), subsequent angle of 6 ° to 10 ° is appropriate.
Size and orientation, the edge inclination choice of edge inclination to determine the direction of the flow of debris, a reasonable choice edge inclination ls, usually taken from -10 ° to 20 ° is appropriate. Cylindrical micro-fine cars, fine cars hole, fine plane plane should be used edge inclination tool: from ls45 ° to 75 should be taken.

The choice of cutting
Order to suppress the generation of BUE and scales thorn, improve the surface quality, machining with carbide cutting tools, cutting than turning slightly more general carbon steel workpieces, in particular, should not be too high cutting speed is generally recommended cutting speed Vc = 60 ~ 80m/min, cutting depth ap = 4 ~ 7mm, feed amount f = 0.15 to 0.6 mm / r appropriate.

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