Jingwei Textile Machinery Co., Ltd. Yuci Branch (Shanxi 030601) Hao Yanping friction is sometimes mechanical resistance, sometimes it is the basis of mechanical parts, power, such as friction transmission and friction braking. In the mechanical design, by increasing the friction coefficient between the friction surfaces of the parts, the frictional force and the transmission reliability of the friction transmission part can be effectively improved. We use the surface features formed by EDM to locally electrify the surface of the cavity of the die-casting mold to improve the friction coefficient of the friction surface of the part.
The principle of EDM is based on the electro-corrosion phenomenon of the pulsed spark discharge between the tool and the workpiece (positive and negative electrodes) to etch away excess metal to achieve the desired size and surface requirements.
EDM is to use the energy of the spark discharge to melt and vaporize the electrodes and the material in the discharge micro-region of the workpiece, and is thrown away from the substrate under the action of the discharge explosive force. On the workpiece, a silver-gray orange die-casting mold is formed by a myriad of dense reinforcing points and discharge pits. The surface of the EDM handle lock nut die-casting mold is conventionally formed by mechanical processing, surface heat treatment, and trimming by a fitter. A smooth surface is formed, and the surface of the die-cast part is also smooth. In order to increase the friction transmission power of the lock nut, for the use characteristics of the lock nut, the surface of the friction drive cone of the mold after mechanical machining is subjected to electric sparking (ie, a fine orange-skinned surface shape is formed at the portion). appearance). The degree of roughening of the mold can be selected according to the surface requirements of the part, and the appropriate electrical specifications and parameters are used. The surface roughness of the rough gauge is generally in the range of *, and when the fine gauge is used on time, the surface roughness is * in order to satisfy the roughness. The requirement can be achieved by limiting the discharge energy of a single pulse, and the surface roughness of the EDM increases with the increase of the pulse energy.
Die-casting effect after mold EDM treatment The surface of the die-casting mold is electrically strengthened by electric spark to form a leather-like surface. At the same time, the electrode material forms a special alloy layer on the surface of the workpiece, and the heat collecting and cooling effect of the spark discharge has a quenching effect on the surface.
The rotation of the brush part of the comb brush of the comber is driven by the friction force of the two ends of the lock nut (as shown). The magnitude of the transmitted power mainly depends on the friction between the lock nut and the brush body. Force size.
Under the condition that the tightening force of the lock nut is constant, increasing the friction coefficient of the friction surface is an effective way to increase the friction force.
Forming. Since the surface of the mold has a lower roughness value, the surface of the die-cast lock nut part is smooth, and slippage is easily generated in the transmission, which affects the realization of the transmission function and its reliability.
The surface is small and convex, and all parts are duplicated on the transmission surface of the lock nut after the part is die-cast. The microscopic small convex and concave of the lock nut transmission surface increases the friction coefficient of the transmission surface, so that the tangential force of the transmission is significantly increased, preventing relative sliding, thereby improving the reliability of the transmission. In short, the production of die-casting molds strengthened by electric sparking has not only improved the friction coefficient of the transmission surface of the lock nut, but also improved the durability of the mold.
The electric corrosion phenomenon of the material by EDM can effectively improve the surface condition of the mold and the surface of the part, thereby changing the friction coefficient of the friction transmission surface, increasing the friction between the transmission parts, and improving the reliability of the friction transmission.
At present, the application of EDM is not limited to the processing of various parts made of tantalum hardness materials and complex cavity molds, but also widely used in all aspects of production practice. In particular, the morphological characteristics of the EDM-enhanced surface also play a unique role in the manufacture of industrial products and daily-use products.
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