The laser solder surface metal accumulation of solder joint centers showed varying degrees of staying, which is mainly due to the metal is too late to backfill. When the laser power reaches a certain value, the liquid metal in the bath sharply evaporation form a key hole, and produce a recoil, the liquid metal to the edge of the molten pool, accumulation in the solder joints around. When the laser stops working, the metal is no longer the evaporation recoil disappear, accumulation of the metal to fill key holes under the action of gravity, weight, cooling and solidification of liquid metal. If the metal solidification in the case of not completely backfill the keyhole staying surface in the mold and Prospects Introduction The Association of International Mold experts that will be formed in the solder joint surface. This type of green laser pointer has the function of remote control.
The mold is the emperor of the metal processing industry. The mold material and mold industrial foundation. But even the higher performance requirements of the new mold material is still difficult to meet the mold. Surface engineering is more active in the performance of current materials science and engineering fields, more rapid development of the branch. Surface engineering disciplines, means diversity, a wide range of functionality, the potential of innovative, environmental protection, strong practicability and great synergistic nature, and thus subject to the attention of all walks of life. Surface engineering technologies in the field of mold manufacturing, in large part to make up for the deficiencies of the mold material. Surface technology applied to the surface of the mold cavity can achieve the following objectives. The appearance color of this kind of laser pointer is argent.
Improve the mold cavity surface hardness, wear resistance, corrosion resistance and resistance to high temperature oxidation resistance, and greatly improve the life of the mold. Improve the capacity of the mold cavity surface resistance to abrasion and mold release ability, thereby improving productivity. Treated by surface coating or alloying of carbon tool steel or low alloy steel, the comprehensive performance can be achieved even more than the performance of high-alloy mold material and carbide, which can significantly reduce the cost of materials. Can simplify the mold manufacturing process and heat treatment processes to reduce production costs. Can be used for the decoration of the mold cavity surface, in order to improve the quality and added value of products. Can be used to mold repair and remanufacturing engineering. The power of green laser is 5mw-10mw.
In this paper, summarized in the following three aspects: An Introduction to the three main types of surface used in the mold industry (surface transforming the surface coating and surface alloying technology) the principle of surface treatment technologies, an overview of the advantages, disadvantages and range of application of various technologies, and illustrates the application effect of the mold or actual production. Unilaterally from the surface mold and surface in the mold repair were reviewed. The application of rare earth surface engineering technologies in the mold manufacturing. On the nano surface engineering technologies in the mold manufacturing is also discussed. A surface of a wide range of commonly used in the mold surface technology summed up in three categories: surface transforming technology, surface coatings and surface alloying. More details of green laser led will be given in the list.
The major class includes different methods, the following were introduced to the principles, characteristics and applications. Surface transforming the surface structure of the conversion technology, that does not change the surface composition of the material through only to change the material properties to change the surface of the organizational structure characteristics or stress conditions, the flame surface hardening, laser transformation hardening. The flame surface hardening process is the use of oxyacetylene (or other gas) flame the mouth of the quenching of the surface heating and rapid cooling to the surface 2 ~ 10mm thickness range of hardness and wear resistance to improve the process is generally carried out after the assembly simplifies mold part of the manufacturing process to ensure the accuracy of the mold assembly, easy to mold repair welding repair but require operators skilled. green laser pointer can make the computer to automatically turn over the pieces of page of different documents.
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