UDC 621.9

 

Lymar O.

 

The article discusses the wear patterns of interchangeable five-sided non-turning inserts during continuous turning of corrosion-resistant, heat-resistant martensitic steel grade 20X13, as well as the influence of the geometric parameters of the cutting edges of the inserts on the resistance to brittle fracture of the cutter. Experimental studies of the influence of replaceable inserts with a nitride-titanium coating (TiN) on the durability of turning tools with mechanical fastening of inserts in a wide range of speeds were made, as a result of which it was proved that the performance of cutting inserts on which a wear-resistant coating was applied increased by more than 1, 5 times. On the basis of theoretical and experimental-statistical data, the optimal cutting conditions were selected for carbide non-milling inserts for finishing machining of 20X13 chrome steel.
The nature of wear and the influence of cutting modes on the stability of the lathe tool in turning conditions are analyzed. The characters of the destruction of hard-alloy plates and their causes are considered, as well as methods that contribute to reducing the intensity of the flow of abrasive-mechanical wear in the conditions of adhesive interaction of tool material with chips. Laboratory resistance tests have proved that the use of a coolant leads to an improvement in the quality of the processed material and contributes to uniform wear of the cutting parts of the tool. The study of hard-alloy plates allowed us to determine with high accuracy the period of resistance of the cutting edges of replaceable hard-alloy plates and make a comparative analysis of them.
The relationship between changes in the physical and mechanical characteristics of tool hard alloys under the influence of temperature and force with the strength and performance of replaceable polyhedral plates of prefabricated tools is established. A complex method of improving the performance and reliability of the cutting tool by applying lubricants and wear-resistant coatings on the cutting tool to ensure maximum durability of turning tools and improve the quality of the processed layers of the part surface is considered.

Keywords: cutting tool, pentagonal plates, lubricating and cooling liquids, stability characteristics, wear resistance of the cutter, wear-resistant coatings, hard-to-process materials.

 

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