Spare parts of stainless steel of thin wall of air cooling cutting
- source:GERHOLD CNC Machining
4 ～ 1.
6µm, surface roughness is worth smaller test result to had been jumped over, the spare parts material that tests a model is stainless steel more (1Gr18Ni9Ti) . The analysis of 1 treatment difficulty and the cutting sex that process methodological stainless steel are poorer, be called embarrassed cutting material. The cutting problem of the character of stainless steel material and generation analyses as follows: In machining process of sclerotic sex big cutting, be out of shape by plasticity of treatment material generation, be formed by treatment surface from this sclerotic layer. Of the cutting tool of occurrence meeting aggravate of sclerotic layer wear away, especially the border of cutting tool wears away. The quantity of heat that heat conduction leads low cutting to machine production 70% ～ 80% be by cut bits to take away. But, when the heat conduction rate of material is low, the quantity of heat that cutting takes away is little. The temperature that cutting nods rises, cutting tool life can shorten. Endophilicity is machined greatly the endophilicity of material is big, make point of a knife produces face of the knife after the tumour that accumulate bits is mixed to produce attachment easily, make be dropped by treatment surface precision thereby. Additionally the appearance of this kind of spare parts is curved surface structure, final process uses CNC machining take shape, the wall is large it is 1mm only, increased the difficulty of treatment, the cutting method that uses a convention machines the spare parts of figuration, be out of shape serious, surface roughness short of asks, the cutting tool in machining a process wears away serious, affect numerical control figuration, appearance appearance is controlled not easily. After undertaking investigating to traditional cutting method, considered to cool with air cooling, minim machines a method oil-lubricatedly. With period achieve raise the treatment precision, goal that prolongs cutting tool life. General cutting method wants principle of treatment of air cooling of treatment of 2 air cooling to use cutting liquid in great quantities, undertake cool and lubricating, with period achieve the goal that raises cutting tool life and exterior surface roughness. And method of treatment of air cooling cutting is to be in - 10 ～ - while the air cooling of 30 ℃ undertakes cooling to cutting dot, oily to plant of minim of supply of area of knife of cutting tool around, rise to reduce cutting temperature and lubricant effect with this. Graph the wear curve air cooling of cutting tool of graph 3 K10 machines sketch map of system of 2 exam unit experimental air cooling and compressor of air of unit of supply of minim cutting juice arise compress air, through be the same as cutting to oily machine fluid mixes pulverization supply cutting tool one before knife face and hind knife face, another is arrived to furnish by refrigeration through cooling pipe of eddy current type cutting is nodded (see the graph shows) 2 times. Experimental condition machine tool is lathe of rigid numerical control aspirant travel, cutting tool is hard alloy K10; Cutting speed V=150m/min; Feed F=0.
055mm/r: Cutting deepness Ap=0.
1mm. Experimental data measures force to test a model for what stainless steel makes. The experiment divides 3 kinds of cases: Experimental A uses water not fluid of dissolve sex cutting. Experimental B is used - 10 ℃ air cooling, do not add minim cutting juice. Fluid of cutting of experimental C use minim and - 10 ℃ air cooling is used at the same time. In above given undertake study below experiment condition, the test result that gets to place undertakes analytic comparative, the effect that machines to air cooling thereby undertakes evaluating. Test result and discuss cutting of air cooling of the tumour that accumulate bits to have very apparent effect to reducing the tumor that accumulate bits, face of the knife after minim cutting fluid can soak cutting tool and be machined between the surface, and face of the knife before cutting tool and cut bits, decrease both the attrition C between makes the tumour that accumulate bits decreases then. Discovery is returned in air cooling experiment, minim cutting fluid furnishs of cutting tool hind knife side effect is best. Of cutting tool wear away the close of cutting tool wear extent of experiment A and experiment C, and the cutting tool of experiment B wears away bigger, this shows minim cutting fluid is reducing cutting tool to wear away the effect with the main move since the respect, prolonged the life of cutting tool, reduce the time that grind a knife, reduced finished cost (see the graph shows) 3 times. Treatment surface decreases as what accumulate bits tumour, rose to machine exterior quality. Although experiment the close of cutting tool wear extent of A and experiment C, but the exterior surface roughness of experiment C gets ameliorative, treatment surface situation is the idealest, exterior surface roughness is worth from Ra3.
2 ～ 6.
4µm fell Ra1.
6 ～ 3.
2µm, again classics is abrade, can achieve the test model requirement to exterior surface roughness. Dimension precision because the working temperature of air cooling cutting is low, reduced those who test model part to be out of shape, assured the dimension precision of the spare parts and appearance precision thereby. Air cooling adds minim cutting fluid to be able to reduce cutting force greatly again, because of this experiment spare parts of model of 5 treatment test appears local be out of shape or 30% of waist drum form, experimental B is 24% , experimental C is only 10% . The requirement that air cooling treatment accords with environmental protection is many the use of cutting fluid had very big effect to raising product precision, but the limitation of the development as contemporary cutting technology and environmental protection, it will be used again the place of processing technique of air cooling cutting of minim vegetable oil is replaced. 3 conclusion are aimed at the cutting function difference of stainless steel, from proceed with of general cutting method, analysed using the issue that cutting tool of hard alloy K10 and water do not appear when fluid of dissolve sex cutting. Use processing technique of air cooling cutting then, solved general cutting to machine the malpractice of the law, got satisfactory result. CNC Milling