1、机械专业中英文文献翻译 中文 5896 字 英文原文 Influence factors on the quality of the workplace surface Processing process on the surface quality of the influence The vibration of the process system of the influence on the quality of the surface In mechanical processing process technology system sometimes occur vibrat
2、ion, that is, in the cutting edge tool and workplace is cutting surface except on the name between cutting motion, but also can appear a cyclical relative motion. Vibration that process system by forming movement of the interference and damage, make processing surface appear chatter marks, increases
3、 the surface roughness value, worsening processing surface quality. Cutter geometrical parameters, materials and cutting quality to the surface quality of the influence The cutting tool geometric parameters on the surface roughness of the biggest influence is vice PianJiao, the main point PianJiao,
4、arc radius. Under certain conditions, reduce PianJiao, Lord, vice PianJiao point arc radius can reduce surface roughness. Under the same conditions, carbide cutting tools process of surface roughness value less than high speed steel paper cutting knife, and diamond and CBN) tools and better than har
5、d alloy, but because the diamond and iron family affinity materials, it should not be used for processing iron family materials. In addition, the cutting tool before and after the face, cutting knife blade itself directly influence the roughness of the processing the roughness of the surface, theref
6、ore, improve the quality of cutting tool, cutting tool and face, cutting knife blade roughness value should be lower than the roughness of the 1 2 levels. Cutting fluid to the influence on the quality of the surface Cutting fluid cooling and lubrication effect can reduce the cutting process of inter
7、face friction, reduce the temperature of cutting zone, the cutting metal surface layer of plastic deformation degree down, restrain the develop the thorn and scales produced in the production of different materials for reasonable choice of cutting fluids can reduce the surface roughness. The workpla
8、ce material on the surface quality of the influence The workplace material nature； Processing plastic materials, the cutting tools for metal extrusion produced plastic deformation, and the cutting tool and workplace forced separation of the torn scraps effect, make the surface roughness value increa
9、se. The workplace material tenacity the better, metal, plastic deformation, the bigger the processing surface is the more the rough. Processing brittle material in the chip broken granular, due to the collapse in broken and endows the machined surface left many pitted surface roughness. General toug
10、hness large plastic materials, processing after large surface roughness, and toughness of smaller plastic materials, processing to get smaller after the surface roughness. For the same kind of material, the greater the grain size of the organization, the larger the surface roughness. Therefore, in o
11、rder to reduce the surface roughness, often in cutting processing of 机械专业中英文文献翻译 material before quenching and tempering or is the fire of treatment to obtain homogeneous fine grain organization and high hardness. Cutting condition the influence on the quality of the surface And cutting condition of
12、 the relevant process factors, including cutting dosages, cooling lubrication. In low speed processing plastic materials, easy to produce the develop and scales thorn, so, improve the cutting speed, can reduce the develop and scales thorn, decreasing part already the surface roughness value； For bri
13、ttle material, general wont form the develop and scales thorn, so, cutting speed on the surface roughness basically no influence. The increase speed, plastic deformation also increases, the surface roughness increases, so, reduce the speed can reduce the surface roughness value, however, feeding red
14、uced to certain value, roughness wont obviously decreased. Normal cutting conditions, cutting depth on the surface roughness the impact is not big, therefore, mechanical process cannot select the too small cutting depth. Cutting speed on the surface roughness influence General at the early choose lo
15、w speed cutting and finishing choose high speed cutting can reduce the surface roughness. In the medium speed cutting plastic materials, due to easy to produce the develop, and plastic deformation is bigger, so after processing parts surface roughness is bigger. Usually by low or high speed cutting
16、plastic material, can effectively avoid the develop of generation, this to reduce table and roughness have positive role. On the surface quality of the grinding effects The influence of the grinding wheel grinding wheel granularity the thinner, per unit area grain number grinding, the more of the gr
17、inding surface in fine scratches the surface roughness is small； But if too fine granularity, processing to jam wheel it will increase the surface roughness, also easy to produce the ripple and cause burns. The hardness of the grinding wheel should be the right size, its half the longer the better p
18、assivation period； The hardness of the grinding wheel is too high, grinding mill is not easy to fall off when grain, make processing surface is of friction, extrusion action intensifies, thus increasing the plastic deformation, making the surface roughness increases, also easy cause burns； But the g
19、rinding wheel is too soft, grits too easy to fall off, can make grinding action is reduced, leading to the surface roughness increases, so to select the right grinding wheel hardness. Grinding wheel dressing the higher the quality, the surface of the grinding wheel cutting the blade, cutting the num
20、ber of all the more the better of the blade contour sex, grinding surface roughness and smaller. The influence of the grinding wheel speed increase dosage, unit time through the processing of grinding surface grain number increase, each star grits is ground to reduce thickness of the metal, the surf
21、ace area of the residual reduced； And at the same time, improve the grinding wheel speed can also reduce the workplace material of plastic deformation, these can make processing surface roughness value reduced. Reduce the speed, unit time through the processing of grinding surface grain number incre
22、ase, the surface roughness decreased； But the low speed, workplace and grinding wheel contact time long, to the quantity of heat of the increasing, opposite will increase the roughness, may also increase surface burn. Increase grinding depth and longitudinal feeding, the plastic deformation increase
23、, will lead to the surface roughness value increase. Radial feeding 机械专业中英文文献翻译 increase, the grinding process grinding force and grinding temperature will increase, grinding surface plastic deformation degree increase, which will increase the surface roughness. To guarantee the machining quality in
24、 the premise of grinding efficiency increase, will require a higher surface the coarse grinding and fine grinding separately, coarse grinding is used when the big radial direction feeding, fine grinding the radial feeding the smaller when, finally without into to grinding, to get the surface roughne
25、ss of surface is very small. The workplace material the workplace material of hardness, plastic and thermal conductivity on the surface roughness of big effect. Large plastic soft material easy jam grinding wheel, thermal conductivity poor heat resistant alloy easy for the abrasive early caving, wil
26、l lead to increased grinding surface roughness. In addition, because grinding to the high temperature, reasonable use cutting fluids can reduce the grinding of temperature, reduce burns, can also rushed to fall off the grits and scraps, avoid scratch workplace, so as to reduce the surface roughness.
27、 Affect the surface of physical and mechanical properties of factors Surface layer cold hardening. The cutting edges obtuse radius increased, and the surface of metal the extrusion of enhanced, plastic deformation intensifies, cold hard to strengthen. After cutting tool knife surface wear increases,
28、 the knife surface and after processed surface friction intensified, plastic deformation increase, cold hard to strengthen. Cutting speed increase, cutting tool and workplace role time is shortened, make plastic deformation expand the depth decreases, and cold hard layer depth decreases. After cutti
29、ng speed increase, heat cutting in the surface layer effect time also shortened, will make cold hard degree increase. Feeding increases, cutting force also increased, and the surface of the metal plastic deformation intensifies, cold hard effect is strengthening. The workplace material of plastic is
30、 larger and the cold hard phenomenon the serious. Surface layer material metallographic composition change. When cutting the heat was processing surface temperature of phase change after more than temperature, the surface of the metal microstructure will change. Grinding burns when a surface tempera
31、ture of phase change to millers temperature above, metal surface microstructure occurred change, make the surface of the metal strength and hardness of the lower, and with residual stress produce appear even microscopic cracks, this phenomenon is called grinding burns. Improve grinding burns grindin
32、g heat caused by grinding way is the root of the burn, so improving grinding burns by two ways: one is as far as possible to reduce the generation of grinding heat； 2 it is improved cooling condition, make as far as possible the quantity of heat to produce less workplace. The correct choice grinding
33、 wheel reasonable choice of cutting dosages improved cooling conditions. Surface layer residual stress. Produce residual stress of reason: cutting in processing the metal layer and the surface when there were plastic deformation occurs, the surface of the metal to hematocrit increase； Cutting proces
34、sing, cutting area will have a lot of heat cutting produce； Different analysis of metallographic organization has different density, also have different olume is necessarily affected by the change of connected the matrix of the metal bar, hence residual stress produce. The main work surface eventually process to the choice of methods. Choose the
