Research progress of metal-based diamond tools with porous structures
Pores can increase the chip-holding space and cooling efficiency,so as to improve the service performances of metal-based diamond tools.However,the mechanical properties decrease sharply with the increase of porosity,which in turn restricts the service performance of the tools.In recent years,the preparation methods of porous metal-based diamond tools have become more and more diversified.Not only the pore structures in the tools have been developed from the traditional uniform pores to the ordered local pores,but also the performances and costs of tools are significant different.Therefore,this paper firstly introduced the pore characteristics of porous diamond tools and its influence on tool performance.Then,it systematically introduced the technical principles and key points of parameter control of various preparation methods focused on traditional hot pressing method,3D printing method and surface dressing method for preparing porous metal-based diamond tools.The relationship between preparation process parameters,pore microstructures,tool mechanical properties and tool service performances were summarized.Finally,the advantages and disadvantages of each preparation method and its applicable scope were reviewed,and the possible development direction of porous metal-based diamond tools was discussed.
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