机械外文翻译---高速切削加工在模具制造中的新应用-模具设计(编辑修改稿)

机械外文翻译---高速切削加工在模具制造中的新应用-模具设计(编辑修改稿)内容摘要：

n. highspeed cutting thin wall ponents change the part substitutes certain crafts, like electric spark machining, abrasive machining and so on High strength and the high degree of hardness39。 s processing is also a highspeed cutting major characteristic, at present, the highspeed cutting has been possible the work hardness to reach HRC60 the ponents, therefore, the highspeed cutting can process after the heat treatment hardens the work piece. In the tradition processes in mold39。 s craft, before the precision work, hardens the work piece after the heat treatment to carry on the electric spark machining, may omit in the die making craft with the highspeed cutting processing substitution tradition cutting39。 s processing method the electric spark machining, simplified the processing craft and the cost of investment. the mold39。 s size, the shape and the surface roughness are very important, if after processing the mold cannot meet the requirements the quality precision, needs the massive handworks to rub repairs the work, the handwork rubs repairs can obtain the good surface quality, but it will affect mold39。 s size and the shape precision. Therefore must omit as far as possible in the mold processing rubs manually repairs, improves the mold quality, reduces the production cost and the manufacturing cycle. Figure 3 is the traditional mold processing process: The semifinished materials rough machining semifinishing heat treatment hardens the electric spark machining precision work to rub manually repairs. Figure 4 is the high speed mold processing process: Hardened semifinished materials rough machining semifinishing precision work. the traditional mold processes process Figure 4 the high speed mold processes process in Figure 4, in the high speed mold machining process reduced two technological processes, probably reduces the process period 30%~50%. In the traditional processing craft39。 s electric spark machining forms the hardened level easily in the melting processing surface layer, degree of hardness may reach 1000Hv, brings the difficulty for the following machining and the abrasive machining. The electric spark machining also easy to cause the surface layer fatigue cracking and cutting tool39。 s breakage. Economic efficiency remarkable enhancement Synthesis above all sorts of merits, namely: The prehensive efficiency will improve, the quality enhances, the working procedure simplifies, the engine bed investment and the cutting tool investment as well as the maintenance cost increase and so on, will use the highspeed cutting craft to cause the synthesis economic efficiency remarkable enhancement. 3 highspeed cutting processing craft essential technology The high speed engine bed and the high speed cutter are the realization highspeed cutting premise and the basic condition, has the strict request in the highspeed cutting processing to the high speed engine bed performance and the cutting tool material choice. In order to realize the highspeed cutting processing, uses the high flexible high speed numerical control engine bed, the processing center generally, also some use specialpurpose high speed mills, drilling machine. At the same time the engine bed has the high speed main axle to be systematic and the high rapid advance or progress gives the system, the high main axle rigidity characteristic, the high accuracy localization function and the high accuracy insert makes up the function, specially the circular arc high accuracy inserts makes up the function. The highspeed cutting cutting tool and ordinary processes the cutting tool the material to have is very greatly different. The main use cutting tool material has the hard alloy, the crystal bination diamond (PCD), the crystal bination cube boron nitride (PCBN) and the ceramics and so on. The highspeed cutting craft technology also is carries on the highspeed cutting processing the key. The cutting method chooses is improper, can make the cutting tool to intensify the attrition, cannot achieve the high speed processing pletely the goal. The practice proved, if only then the high speed engine bed and the cutting tool but do not have the good craft technology to make the instruction, the expensive highspeed cutting processing equipment cannot fully play the role. The highspeed cutting processing craft essential technology mainly includes the cutting method and the cutting parameter choice optimization. a. Cutting way choise In the highspeed cutting processing, should select the down milling processing as far as possible, because in down milling time, the cutting tool just cut into the thickness of chip which the work piece produces to a big way, afterward reduces gradually. When up milling, the cutting tool just cut into the thickness of chip which the work piece produces to be smallest, afterward the accumulation, increased the cutting tool and the work piece friction like this gradually, has the big calorimetry on the knife edge, therefore produces in the up milling quantity of heat when down milling are more than, the radial force also greatly increases. Meanwhile in the down milling, the knife edge main pression stress, but when the up milling the knife edge tension stress, the stressful condition is bad, reduced cutting tool39。 s service life, the down milling and the up milling the cutting tool cuts into the work piece the process, as shown in Figure 5. the cutting tool cuts into the work piece the process hint b. Maintains constant metal removing rate The highspeed cutting processing is shallowly suitable for shallowly to cut the depth, the depth of cut should not surpass (ae/Ap), this is for avoids the cutting tool the position deviation, guarantees processes the mold the。