High-speed steel cutting tool is processing the application in material of high temperature alloy

ψ of 2(MPa) δ 5(%) (%) α K(MPa)HB20130080026.

431.

10.

39298 ～ 39081562020320.

61 treatment characteristic 1.

Content of the Ni in alloy of GH864 of 1 mechanical function is in 51.

7% above, total content of element of Ni, Cr is as high as 72.

69% , this alloy has higher high temperature strength, its machinery function (1) seeing a table is equivalent to American Waspolly alloy. 1.

Because content of Ni, Cr is very high,2 cutting machine characteristic GH864 alloy, the carbonization material that the element such as the Cr in alloy, Ti, Mo, Al forms many metal compound and tall hardness nods: The austenite organization of alloy is out of shape in the plasticity when cutting is machined acuteness, rupture so tenacity is very big, treatment case hardening is serious, the cutting muscularity of generation. Opposite processability of HB of hardness of normal temperature of B(MPa) of σ of material of the mechanical function that expresses steel of 2 45 date and GH864 alloy and treatment function contrast 20 ℃ 45640105269 ～ of 815 ℃ 3021GH8641300620298 ～ 3900.

08 basises experiment, GH864 alloy is in the tensile strength when 815 ℃ is 45 steel 5 what issue tensile strength in this temperature.

9 times, and 0 what its cutting is 45 steel only relative to processability.

08 times (2) seeing a table. 2 tatty reason and the W18Cr4V that analyse us to use standard Ø40mm establish milling cutter treatment to move blade tenon to age oblique plane does a test, adoption cutting amount is N=47 of cutting tool rotate speed.

5r/min, feed speed Ff=30mm/min, cutting width Ae=32mm, cutting deepness Ap=1mm: Cooling lubricating fluid is made after mixing with derv and useless engine oil. In 3 cutting, it is respectively when milling length 66, 80, 77, 77, when 71mm, walk along a knife to make milling cutter wears away badly, cannot proceed treatment. Right now point of a knife wears away irregular round horn, wear away the value is made an appointment with 1.

5mm, knife face wears away after the value makes an appointment with 2mm, exist have deeper groove, through experimenting for many times, the circumstance agrees basically. From inside analysis of characteristic of function of GH864 material treatment knowable, GH864 material ruptures tenacity is big, the cutting work that uses up when treatment is great, produce many heat in metal cutting, the hard particle in the material below high temperature produces intense friction to edge, and hardness of the cutting tool in the process that lifts in temperature is in again drop, the intensity of GH864 alloy drops however not much, the hardness that is in the aggrandizement photograph γ on alloy crystal boundary still lifts somewhat, when cutting temperature prep above the hardness of milling cutter of the W18Cr4V when 600 ℃ drops quickly, lose cutting ability, cause face of the knife after edge is mixed to wear away badly then, the processability that because this causes milling cutter tatty,main reason is GH864 alloy above all can be poorer. Next, the geometrical angle that the standard establishs milling cutter itself is unwell at processing data of high temperature alloy also be cutting tool tatty main reason, Ø40mm establishs milling cutter helix angle β is 30 ° , before horny γ 0 for 15 ° , r of κ of tool cutting edge angle is 90 ° , ° of Epsilon;r<90 of horn of point of a knife, as a result of before part is larger, edge intensity is poorer, and part of point of a knife is small are gone against medicinal powder hot, intensity of point of a knife is low, make plus the tool cutting edge angle of κ R=90 ° cut ply thickening, width decrescent, create force of cutting of susceptive of place of length of cutting blade unit very big. Point intensity is so low, part of point of a knife is small, medicinal powder heat is bad to caused W18Cr4V to establish the generation when milling cutter machines GH864 alloy bigger wear away. 3 means of settlements 3.

The logical choice of 1 geometry parameter carries the part before reducing, increase the horn of point of a knife, tool cutting edge angle that reduces cutting blade to raise W18Cr4V to establish intensity of milling cutter point, increase point of a knife medicinal powder hot area, reduce the cutting force on length of cutting blade unit, raise the goal that establishs milling cutter life in order to achieve, established the standard milling cutter to undertake blade is ground 2 times, for many times after the experiment, got reasonable geometrical parameter is as follows: ? ?=0 ° , 8 ° of ～ of α 0=6 ° , 45 ° of ～ of κ R=35 ° , γ 1=0 ° , 5 ° of ～ of α 1=3 ° , 3 ° of ～ of κ R=2 ° .

Grind through repairing establish milling cutter and standard to establish milling cutter photograph to compare, horn decreases before for zero, horn of point of a knife increased nearly one times, tool cutting edge angle reduced 1/2, increased effectively to establish the point of milling cutter, increased point of a knife medicinal powder hot area, improved the condition getting power of cutting blade, make blade of cutting blade unit sufferred force longly to reduce 40% ～ 50% , improved cutting tool life thereby. 3.

2 cutting dosage and cutting fluid are machined actually in, choice cutting dosage is: V=4 ～ 5m/min, ff=30mm/min, ap=1 ～ 2.

45mm, ae=30 ～ 35mm. The basis experiments, use diesel oil 10% , useless engine oil 60% , vulcanization is lardy the mixed liquor of 30% regards cutting as fluid, improve cutting condition effectively. It is better that when the common high-speed steel after blade of classics of 4 use effects is ground establishs milling cutter to machine GH864 alloy, bits figuration is cut, control easily, of workpiece already machined exterior surface roughness to be able to amount to Ra12.

5 ～ 6.

3µm, satisfied treatment requirement. Cutting tool wastage reduced 2/3, and milling cutter blade grinds a method simple, the worker masters easily. CNC Milling CNC Machining