Extrusion method for producing cemented carbide rods

Abstract

The invention provides an extrusion method for producing cemented carbide rods, which includes wet grinding raw materials, mixing slurry and spray drying, mixing powder and mixing molding agent, extrusion molding, vacuum drying, cutting to length and integrating Chemical sintering, adding paraffin, cellulose and active agent during wet grinding of raw materials, and adding molding binder during extrusion molding. The process of the present invention is simple, which is beneficial to saving working hours and improving processing efficiency. At the same time, paraffin, cellulose and active agent are added during wet grinding, which not only ensures the granulation effect of the mixture during spray drying, but also improves the direct yield of powder , Adding molding binder in extrusion molding can make it feasible to implement rapid volatilization and deoiling of extruded rods, and it can also ensure fast drying without cracking, which is conducive to improving processing efficiency and ensuring sintered rods Medium oxygen content stability, good use stability and strong applicability.

Description

technical field [0001] The invention belongs to the technical field of extrusion molding of cemented carbide rods, and in particular relates to an extrusion method for producing cemented carbide rods. Background technique [0002] When using the extrusion method to manufacture circular cross-sections, special-shaped cross-sections and perforated cemented carbide profiles with large length-to-diameter ratios, most of them need to be wet-milled, mixed with slurry, vacuum-dried, sieved into mixed powder, and then infiltrated. Forming agent, after extrusion molding, drying in the shade, processing drying, pre-burning and degreasing, cutting to length, and then sintering, it not only has more process restrictions, but also has a long production cycle, which seriously affects production efficiency. At the same time, its extrusion Compression molding cannot meet the requirements of each process in the production process, and even contradicts each other. For example, the mixed slurr...

AI Technical Summary

Problems solved by technology

[0002] When using the extrusion method to manufacture circular cross-sections, special-shaped cross-sections and perforated cemented carbide profiles with large length-to-diameter ratios, most of them need to be wet-milled, mixed with slurry, vacuum-dried, sieved into mixed powder, and then infiltrated. Forming agent, after extrusion molding, drying in the shade, processing drying, pre-burning and degreasing, cutting to length, and then sintering, it not only has more process restrictions, but also has a long production cycle, which seriously affects production efficiency. At the same time, its extrusion Compression molding cannot meet the requirements of each process in the production process, and even contradicts each other. For example, the mixed slurry is prepared by vacuum drying and sifting machine, which not only takes a long time, but also consumes a lot of energy. For alloy powder, it is easy to cause burning and oxygen content out of control; in addition, in order to evenly mix molding agent into the mixed powder, the rubber cellulose molding agent process uses a very viscous polymer glue, which can only be used in It is carried out in a Sigma mixer with a small capacity, and each time the mixture is added ≤ 25Kg, which seriously affects the efficiency of processing, and its mixing will also be affected by human factors, thereby affecting the quality of processing; The heating and drying treatment under normal pressure takes a long time, usually more than 30 days, which seriously affects the processing efficiency, and after drying, the extruded rod is broken and cannot directly enter the cut-to-length process, and it must be pre-burned and degreased, which not only greatly increases the production cost , and the extruded rod after dewaxing is easily oxidized and heated after being released from the furnace, resulting in fluctuations in the bad oxygen content of the sintered rod. It can be seen from the above that the extrusion method of the traditional technology is limited to a certain extent, and it is difficult to meet the needs of the market.

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