文献翻译-机械加工表面质量.doc

1、外文资料1：Machining surface quality Mechanical Parts destruction , the general always start from the surface layer. Product performance, in particular its reliability and durability, to a large extent , depends on the surface layer of quality. Surface quality research purpose is to master various techno

2、logical factors on the surface quality of the law, for the use of these laws to control the machining process, and ultimately improve the surface quality, enhance product performance goals.I. Effects of surface roughness factor Cutting the influence of surface roughness factor1、 Tool geometry Reprod

3、ucibility Tool relative to the work piece for Feed Movement, in the surface layer leaving a residue cutting area, its shape when the cutter geometry Reproducibility. Reduced feed rate, the main angle, and vice angle increases Corner Radius, may reduce residual height. In addition, the increase appro

4、priate tool in the past to reduce the cutting of plastic deformation, reasonable choice lubricant and improve the quality of grinding tool to reduce the cutting of plastic deformation and inhibit tumor knife and stabbed the production scales, Surface roughness is reduced value of the effective measu

5、res.2、 The nature of the work of piece material Plastic materials processing, from knives to metal extrusion produced plastic deformation. Moreover, chip tool and work piece forced separation of tear, the surface roughness values increase. Work piece material toughness better, the plastic deformatio

6、n of metals bigger, and the rougher surface. Processing of brittle materials, his chip was broken granular; as chip and the collapse of the broken surface left many Mas, roughen the surface.3、 Cutting dosage Grinding effects of surface roughness factor As machining surface toughness when the formati

7、on process, grinding the surface roughness also formed by the geometry factors and plastic deformation of metals to decide. Grinding surface roughness effects of the main factors: the size wheel, wheel of hardness, Grinding Wheels, Grinding radial velocity grinding feed mill volume and the number of

8、 light, the work piece circumference feed rate and axial feed rate, cooling lubricant.The impact of the surface layer of the physical and mechanical properties of factors In machining, cutting force due to the work piece and cutting hot, so that the surface layer of metal physical properties have ch

9、anged, the most important change is the surface layer of metal micro hardness changes microstructure changes and the emergence of residual stress. As grinding as the plastic deformation and thermal cutting edge than the more serious cutting, thus grinding the surface layer above the physical mechani

10、cal properties of three changes to be very high.Hardened the surface of the work piece2、 The hammer-harden and its evaluates the parameter The process of cutting force role for the plastic deformation, so that the lattice distortion, distortion, the grain between the shear slip. Grain elongated and

11、fibrosis, or even broken, which will make the surface layer of metal hardness and strength. This phenomenon known as cold-hardening. Surface layer metal reinforcing findings will increase resistance to deformation of the metal, reducing the metal plastic. Metal of the physical nature will also chang

12、e. Cold work sclerosis by the metal-at the high-energy state of instability, only one possible,.Metal instability it is necessary to the relatively stable state of transformation, a phenomenon known as dilution . Weakening the role of the size depends on the level of temperature, duration of tempera

13、ture and the length of the degree of strengthening. As the metal in the process, and also by the heat, and therefore, after processing the metal surface depends on the final nature of strengthening and weakening of the combined results.3、 The impact of the cold-hardening main factors Cutting edge ra

14、dius increased, the surface of the metal compression increased, exacerbated plastic deformation, resulting in enhanced Chilled. Tool flank wear increased flank with the processing of surface friction intensified, plastic deformation increased, resulting in enhanced Chilled. Cutting speed increases, tool and work piece role shorten the time so that the plastic deformation expand the depth decreases, Chilled depth decreases. Cutting speed