Method for doping paraffin forming agent in cemented carbide mixture

Abstract

The invention discloses a method for doping a paraffin forming agent in a cemented carbide mixture. The method comprises the following steps of: melting solid paraffin into fused mass; heating a cemented carbide wet-grinding mixture to be at a temperature higher than the melting point temperature of the paraffin; adding melted paraffin to the cemented carbide wet-grinding mixture; continuously heating and stirring the cemented carbide wet-grinding mixture; and screening and granulating the cemented carbide wet-grinding mixture according to a general method when the cemented carbide wet-grinding mixture reaches a drying requirement so as to obtain a qualified cemented carbide mixture. The method integrates and finishes the steps of drying the cemented carbide wet-grinding mixture and adding the paraffin and evenly stirring in a link and equipment by utilizing the characteristics that the cemented carbide mixture contains alcohol, and the paraffin is dissolved in the alcohol at a temperature higher than the melting point temperature, can dissolve the paraffin without adopting a gasoline or another solvent, avoid mixing impurities in the solvent and has the advantages of decreased production cost, simple process, small equipment investment, simple operation and high cemented carbide wet-grinding mixture quality.

Description

technical field [0001] The invention relates to a production method of cemented carbide, in particular to a method for preparing a mixture in the production process of the cemented carbide, in particular to a method for mixing a paraffin molding agent into the cemented carbide mixture. Background technique [0002] The production process of cemented carbide generally includes steps such as batching, wet grinding, drying, mixing molding agent, granulation, compression molding, stripping molding agent, sintering, etc. In the batching process, alcohol is generally used as a solvent, and the method of mixing molding agent to make a mixture Generally, it needs to be determined according to the type of molding agent. The mixing process of the molding agent requires that the molding agent be uniformly dispersed in the cemented carbide material, avoid bringing in other impurities as much as possible, and facilitate the operation. Paraffin is a commonly used molding agent. The mixing...

AI Technical Summary

Problems solved by technology

The above two methods have their disadvantages. The first method has a long process flow and many production links. The wet-milled mixture is easy to oxidize after drying without adding paraffin, especially for fine-grained and ultra-fine-grained mixtures. The quality of the mixture The difficulty of control is increased; the second method requires a large investment in equipment and is not suitable for small and medium-sized batches of mixture production. At the same time, since paraffin needs to be added to the ball mill, it is difficult to filter the wet grinding mixture slurry and the cleaning of the ball mill is also more difficult.

In addition, these two methods also have the following common disadvantages: the consumption of auxiliary materials such as gasoline or oleic acid is increased in the production process, and the production cost is increased; at the same time, impurities contained in auxiliary materials such as gasoline or oleic acid will be brought into the mixture. In the material, and may form defects such as holes in the sintered alloy