Introduction to the technology of repairing and strengthen the electric ***rk surface
At present, with the constant development and application of mold industry, and the rising requirements of products on mold, more and more high-end precise mold is put into use. During the constant process of using mold, it is inevitable that the mold will have defects such as abrasion, cutting, pin hole, crack and i***irment, etc. The traditional, to certain degree, can help customers repair the mold to save cost, but some problems also emerge. For example, the mold deformation, lowering of rigidity, stress, holes, damage and even scrap after the mold is repaired.
The precision mold mending cold welding machine utilizes high-frequency electric ***rk discharge principle, and carries out no-heat re-surfacing welding to ensure the completeness of mold. It can also utilize the strengthen function to improve the abrasion endurance, heat endurance and erosion endurance of mold, etc.
Work principle of equipment
When the electrode stick (welding rod) is rotating on the work surface, when the distance in some parts is very small, the main frame will discharge electricity and form loop. In the minor areas where they contact, electric current will be passed in a very short instant, and the density of electric current might reach 105~106/cm2 while the discharge time of the current only lasts 10-6~10-5 seconds. As the energy of discharged electric current will highly concentrate on time and ***ce, and produces high temperature from 8000~10000℃ in this minor area, so that local materials of this area will be ionized. The electrode stick (welding rod) will soon be transferred to the surface of work piece under the status of plasma metallurgy, and spread into the surface of work piece, so as to form a sediment layer with fast combination. The electric discharge cycle of the mainframe power is 10-3~10-1 seconds. High frequency electric discharge and electrode stick (welding rod) are rotating and scanning at high speed on the |
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