The internal structure of the rolling knives has no other changes. In order to adapt to the different workpieces, there are different size requirements. The rolling knives are basically customized according to the needs of the workpiece. To enlarge the processing range of the rolling tools, the size of the workpiece must be considered. Scope, and determine the processing and adjustment range of the rolling knives to expand the scope of use, thereby reducing the procurement cost of the tool.
Introduction No matter what kind of metal processing method is used, there will always be fine uneven surface marks on the surface of the part, and there will be staggered peaks and valleys. The rough surface can be seen with the naked eye, and the finished surface It can still be observed with a magnifying glass or a microscope. This is the surface roughness of the part after processing, which used to be called surface finish. The national parameters for surface roughness are composed of height parameters, spacing parameters and comprehensive parameters. This is the basic condition for rolling (no cutting).
Rolling processing is a kind of chipless processing, which utilizes plastic deformation of metal at normal temperature to flatten the microscopic unevenness of the surface of the workpiece to achieve the purpose of changing the surface structure, mechanical properties, shape and size. Therefore, this method can achieve both the finishing and strengthening purposes at the same time, which is impossible for machining such as grinding and turning.
No matter what kind of processing method is used, there will always be fine uneven surface marks on the surface of the part, and there will be staggered peaks and valleys. The principle of rolling processing: it is a kind of pressure finishing, which uses metal at normal temperature. The cold plasticity of the state uses a rolling tool to apply a certain pressure to the surface of the workpiece, so that the surface metal of the workpiece is plastically flowed and filled into the original residual low concave valley, and the surface roughness of the workpiece is reduced. Due to the plastic deformation of the rolled surface metal, the surface layer is cold hardened and the grain is thinned to form a dense fibrous shape, and a residual stress layer is formed, and the hardness and strength are improved, thereby improving the wear resistance and corrosion resistance of the surface of the workpiece. Sex and fit. Rolling is a non-cutting plastic working method.
Advantages No cutting technology is safe, convenient, and can accurately control precision. Several advantages:
1. Improve the surface roughness, and the roughness can reach Ra≤0.08μm.
2. Correct the roundness, the ellipticity can be ≤0.01mm.
3, improve the surface hardness, the force deformation is eliminated, the hardness is increased by HV ≥ 40 °
4. There is residual stress layer after processing to increase fatigue strength by 30%.
5, improve the quality of the coordination, reduce wear and extend the life of the parts, but the processing costs of the parts are reduced.
Residual stress caused by cold plastic deformation:
1. The surface metal produces residual compressive stress.
2. The inner layer produces residual tensile stress.
Surface rolling can produce a residual compressive stress region of about 5mm deep on the surface, so it can greatly improve the fatigue life and stress corrosion resistance of the material surface, especially suitable for surface modification of metal and alloy with crystal structure as face-centered cubic. .
Rolling is not a process of removing the material, and the surface metal fiber after rolling is intact.
After processing, the workpiece can reach the surface roughness Ra≤0.05μm, the ellipticity ≤0.01mm, the hardness can be improved, the iron can increase the Hv40, and the stainless steel "target=_blank> stainless steel can increase the Hv100 and increase the fatigue strength by 30%. The surface of the workpiece is mechanically deformed by force, and the dimensional accuracy is relatively stable for a long time, which greatly improves the service life of the components.
Efficient application efficiency - the surface can be machined to the required surface accuracy in a matter of seconds, with efficiency being 5-20 times more than grinding and 10-50 times more than turning.
High quality - the mirror precision of Ra0.05-0.1um is achieved in one feed; the surface is pressed and hardened, the wear resistance and fatigue strength are improved; the surface is subjected to plastic deformation and the dimensional accuracy can be stabilized for a relatively long time.
Economy - no need for large equipment funds, land occupation, power consumption, waste disposal and other inputs; no need for professional technicians.
Convenient - can be mounted on any rotating and feeding equipment, without the need for professional training to achieve mirror accuracy.
Environmentally friendly - no chips (protecting the environment), low energy consumption.
Safety - No cutting and rolling tools have no cutting edges.
Rolling shank diagram thread handle, BT handle, cross handle, etc., the handle is only used to adapt to the processing of machine tools, such as: drilling, milling machines, lathes, boring machines, machining centers, drilling and drilling planes.
The application of the rolling knives and the internal structure of the rolling knives have no other changes. In order to adapt to the different workpieces, there are different dimensional requirements. The rolling knives are basically customized according to the needs of the workpieces. To enlarge the processing range of the rolling knives, it is necessary to Considering the size range of the workpiece and determining the processing and adjustment range of the rolling knives to expand the scope of use, thereby reducing the procurement cost of the tool.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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