PCD cutting tool exceeds the research of quality of surface of cutting of essence of life

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Summary: Get together with man-made brilliant diamond (PCD) and diamond of natural single crystal (SPD) cutting tool undertook to having oxygen copper material cutting experiments, undertook detect and be analyticed to machining exterior quality. The result makes clear: The treatment surface quality that two kinds of cutting tool acquire in cutting exceeding essence of life has similar sex, because this PCD cutting tool is on certain level,can replace SPD cutting tool to undertake cutting is machined exceeding essence of life. The 1 foreword development as instrument bearing industry, the exceeds nice spare parts requirement of integrality of good to having appearance increases increasingly. Exceed accurate cutting to machine a spare parts not only should have very expensive geometry measure and look dimension precision, still should have wonderful stability, in order to assure overall dependability. The SEM photograph of point of cutting tool of graph 1 PCD in recent years, exceed accurate cutting processing technique to get developing quickly, to material of certain nonferrous metal exceed accurate cutting to machine precision to already was close to academic limit precision. But, at present people is mixed to the microcosmic cutting mechanism of superprecision the research of cutting surface integrality is still insufficient and thorough, treatment surface quality becomes an influence to exceed one of main factors of dependability of nice spare parts. The treatment surface quality of workpiece basically passes exterior surface roughness, surface microscopical the index such as stress of remains of hardness, surface will mirror. In common cutting treatment, the form that because machine remains of sclerotic, surface,the exterior quality problem such as stress causes dimension changes to ask to be able to be ignorred commonly relative to the dimension precision at the spare parts. But in exceeding accurate cutting to machine, because demand of spare parts precision is extremely high, because the change of any this surface parameter can raise the instability of the spare parts. Cutting tool of diamond of natural single crystal (abbreviation SPD cutting tool) it is a kind of only place cutting tool, with Yu Chao accurate cutting can obtain ideal treatment precision, but because material is rare,be short of, the price is accordingly high. Man-made gets together brilliant diamond cutting tool (abbreviation PCD cutting tool) for many bits of cutting tool, as cheap as case of rate of exchange of photograph of SPD cutting tool. We ever ground the mechanism that reachs the exterior surface roughness that wins superfinishing demand to undertake study to the blade of PCD cutting tool before, the article is to PCD cutting tool and SPD cutting tool in superprecision the implementation of workpiece surface quality undertook contrasting experimenting study. Parameter of geometry of cutting tool of 2 experiments condition exceeds treatment of cutting of essence of life to be imperceptible treatment, cutting area is centered at the small zonule near point, the sharp degree of cutting tool already machined exterior quality to have the effect that hold the balance to workpiece. Accordingly, to exceeding cutting tool of cutting of essence of life, outside dividing macroscopical geometry parameter, reflective cutting tool is sharp radius of spent point circular arc is the most important crucial parameter. The graph shows the SEM picture that uses point of PCD cutting tool for experiment place 1 times, its point radius is about 0.

5µm; Experiment place also is made an appointment with with the point radius of SPD cutting tool for 0.

5µm. If the graph is shown 2 times,the experiment uses the geometrical parameter of cutting tool. Graph the machine tool of experiment of condition of geometrical parameter cutting that 2 experiments use cutting tool: MSG-325 exceeds cutting tool of accurate lathe experiment: PCD cutting tool, SPD cutting tool (superfinishing uses cutting tool) workpiece material: Without speed of oxygen copper cutting: V=1000r/min feed: (Take different cost respectively) cutting deepness: Ap=5µm environment temperature controls: 20 ± 0.

1 ℃ cooling means: Sparge of alkyl cooling fluid is cooling the contourgraph of Form Talaysurf surface that surface roughness of surface of workpiece of 3 tests result uses British Taylor-Hobson company to produce measures workpiece to already machined exterior surface roughness, this instrument uses laser to interfere sensor and probe of diamond of natural single crystal, measure precision taller. If the graph is shown 3 times,the exterior surface roughness that gets without oxygen copper workpiece in the cutting below different feed condition measures an outcome. Graph measured value of surface roughness of 3 workpiece surface pursues 4 workpiece surface is microscopical hardness measured value pursues surface of workpiece of measured value of stress of remains of 5 workpiece surface is microscopical hardness uses HX-200 model microscopical sclerometer, the workpiece surface when cutting of different to using below condition of to load 50g feed is microscopical hardness undertakes metrical. The graph shows the face that gets to use PCD cutting tool and treatment of cutting of SPD cutting tool 4 times microscopical the metabolic curve that hardness value follows feed. Stress of remains of surface of stress of workpiece surface remains tests a requirement: Equipment: Appearance of stress of ray of X of RIGAKU numerical control; Voltage: 20kV; Electric current: 0.

6mA; Area of X ray illuminate: 4 × 8mm2; Stress constant: - 9.

4; Ø horn: 0 ° , 15 ° , 30 ° , 45 ° ; The condition is chief: 0.

5 ° ; (2q)min=145 ° ; (2q)max=165 ° . If the graph is shown 5 times,the stress of workpiece surface remains that uses PCD cutting tool and treatment of SPD cutting tool checks a result. Analysis of 4 tests result shows workpiece surface surface roughness 3 times by the graph experiment curve is knowable, when 4µm/r of feed F ≤ , the workpiece surface surface roughness that PCD cutting tool and treatment of SPD cutting tool give all can achieve superfinishing surface quality to ask (Ra ≤ 0.

01um) ; The graph shows the face 4 times microscopical hardness test makes clear as a result, the workpiece face that two kinds of cutting tool gain is microscopical hardness is more adjacent, it is between HV105 ～ HV125; Stress all is the workpiece surface remains that the graph shows curve of stress of workpiece surface remains 5 times to show PCD cutting tool and SPD cutting tool are obtained press stress, the change of stress of treatment surface remains of SPD cutting tool is smoother. In the treatment of cutting exceeding essence of life that 5 conclusion are using diamond cutting tool, workpiece surface surface roughness, cold making stress of remains of sclerotic degree, surface wait for exterior quality index is to assure to exceed the premise of tall stability of nice spare parts and high reliability, should give take seriously adequately. PCD cutting tool does not have oxygen copper in superfinishing (the exterior surface roughness that obtains when F ≤ 4µm/r) , surface is microscopical hardness and exterior remains stress all are close to very much. Cutting tool of the PCD in because this is in,exceeding cutting of essence of life to machine can replace SPD cutting tool on certain level. CNC Milling CNC Machining