The high-speed steel that use aluminium machines high temperature alloy (GH698)

0-16.

0 surplus 2.

80-3.

201.

80-2.

202.

35-2.

751.

30-1.

702.

000.

080.

600.

400.

0070.

0150.

070.

0080.

050.

0050.

0050.

00010.

00250.

00120.

00250.

The 001 mechanical function S0 after expressing 2 heat treatment.

705 ≥ of ≥ of HB of hardness of 2N/mm²sbN/mm²d5%y%AKJ/m² cloth family name 17 ≥ of 1130 ≥ 19 ≥ 39285-341 contains nickel as a result of material composition taller, convict this machining performance is very poor, if use treatment of W18Cr4V high-speed steel, because be machined,material tenacity is mixed agglutinant bigger, cutting blade sticks bits extremely easily and generation accumulates bits tumour, make cutting tool point rapid passivation, bring about cutting tool thereby corrective blade and hole wall are acuteness extruding and attrition, produce grating noise, after machining a few aperture, blade of cutting tool cutting wears away badly namely, if continue to machine, cut bits to be able to help work deeper groove father good when can cause cutting tool to break off. GH698 of material of 1 cutting tool is mechanical below normal temperature performance is not high, but the alloying element in its organization is much, the horniness photograph of all sorts of carbide, nitride is formed when cutting temperature increases, it is put in the hard particle of Al2O3, SiO2, hardness is tall (HV2000-3200) . The austenite organization of alloy is out of shape in the plasticity when cutting is machined acuteness, rupture tenacity is big, the cutting force of generation increases 2 ～ than general medium carbon steel 3 times, treatment is sclerotic and serious the 1/20 ～ 1/5 that index of its opposite treatment function is 45 steel only, GH698 is the stuff of a kind of metal of difficult treatment. Cutting tool material should choose red rigid the stuff with high temperature tall, expensive hardness, the M42(W2Mo9Cr4VCo8) of tall cobaltic high-speed steel that is like the United States and 501(W6Ma5Cr4V2Al) of homebred aluminous high-speed steel, material of these two kinds of cutting tool can satisfy treatment requirement, but M42 price is higher, will tell from use economic efficiency, with 501 more reasonable. 501 for material of homebred and new-style cutting tool, it fastens high-speed steel to add a person by the tungsten platinum of 2% 1% aluminous fusion of the left and right sides and into, have hardness tall, wear-resisting, red rigid hardness of tall, high temperature is tall, thermoplastic good wait for an advantage, its hardness can amount to HRC67 ～ 69. Make cutting tool can undertake machining to alloy of GH698 high temperature with its, but should make on the particular structure of cutting tool and geometrical angle certain improve. Structure of 2 cutting tool designs the special quality of a material of material of alloy of GH698 high temperature, cutting tool (it is with reamer exemple) the design should be made improve accordingly, because this reamer is used at turning over bore with a reamer to machine, structure of its cutting tool and common reamer structure are different, introduce the improvement of cutting tool cutting part only here. The horn before reamer of Go of the horn before reducing decides at workpiece material, rupture as a result of GH698 material tenacity is big, cutting meritorious service is consumed when treatment big, produce many heat in metal cutting, the hard particle in the material below high temperature produces intense friction to edge; And in the process that lifts in temperature, cutting tool hardness is in again drop. GH698 alloy drops not much however, the hardness that is in the aggrandizement photograph G on alloy crystal boundary still lifts somewhat. Go of the horn before so cutting tool should be reduced, increase role of point of a knife, increase strength of cutting tool edge, increase point of a knife to come loose hot area. Increase tine to count the provision in Z state level, z=6 of reamer of F3mm ～ F20mm, show instead Z=8, tooth of bore with a reamer increases to count when feed is certain, every age cutting ply is reduced, and oriented sex is good, can reduce bore with a reamer to cut the surface surface roughness and raise dimension precision. Reduce the regulation in level of state of F of first flank width, bandwidth of blade of F10mm ～ F20mm spends F=0.

15mm ～ 0.

25mm. Reduce now for F=0.

1mm, the attrition that reduces first flank width to be able to reduce first flank and hole wall reduces cutting tool to wear away. Cutting tool of 3 aluminous high-speed steel (reamer) reasonable use the preparation before switching on the mobile phone and examination and high-speed steel photograph to compare, hardness of aluminous high-speed steel is tall and bending strength, tenacity is low when accordingly cutting tool is installed, should avoid to collide. Radial should be checked to beat after reamer is installed, should control in 0.

02mm less than, radial has beaten big, the cutter hub in making reamer is machined easily brace up broken, at the same time bore diameter expands. Additional, return the case in should checking reamer to be opposite, be like the circumstance in be opposite bad, criterion bore with a reamer is cut inhomogenous, get power not all, easy appear " dozen " knife phenomenon. Because GH698 material is qualitative,bore with a reamer cuts dosage relatively " stick " , the space that discharge bits suffers be restricted, experiment according to treatment (it is exemple) with bore with a reamer of essence of life, recommend cutting quantity to be N=26r/min, F=0.

05 Mm/r. Usually, should appear noise of abnormal aperture of bore with a reamer or when the color that cut bits changes apparently, answer to undertake in time repairing grinding to reamer. Cutting fluid gets good treatment quality to prolong cutting tool life, cutting fluid appropriate chooses spray of plant oily pressurization. The 4 problems that require an attention are the cutting function that assures cutting tool of aluminous high-speed steel, must master heat treatment craft strictly, prevent oxidation decarbonization. Should combine treatment practice to choose angle of geometry of optimal cutting tool and cutting dosage, break off in order to prevent cutting tool, improve cutting tool life. CNC Milling