Development and testing of a device for non-destructive testing of hard alloys

Abstract

THE RELEVANCE of the work lies in the need to control the cutting inserts of metalworking tools, which are widely used today in production and used in the machining of products for various purposes in mechanical engineering. The production of carbide plates involves a number of operations: obtaining fine powders, mixing them in certain proportions, shaping, followed by pressing and sintering. Violation of the technology of at least one of the considered operations leads to the production of defective plates, the quality of which does not meet the requirements. The use of such plates in production leads to the production of defective products or an increase in the complexity of their manufacture, which is associated with the need for their frequent replacement. Traditional control methods have a significant drawback - the destruction of the product or its damage. They can be avoided using non-destructive testing methods, which include the coercive force method. The authors proposed a device of an original design, which makes it possible to implement non-destructive testing of the considered products made of hard alloys of various grades. To test its performance, a prototype was developed and tested. THE PURPOSE. Development of a device for non-destructive testing of products made of hard alloys and its testing in order to determine the relative error. The task is relevant, since there is a need for enterprises to control the quality of replaceable carbide inserts of metalworking tools. METHODS. During testing of the device, generally accepted empirical research methods were used, and the determination of the relative error was carried out according to the methodology developed for the Koerzimat 1.097 HcJ coercimeter, as well as using generally accepted methods of mathematical statistics. RESULTS. The electrical structural and principal diagrams of the device have been developed, and its design parameters have been determined. Tests of the device were carried out, during which measurements of the coercive force were made for samples made of various grades of hard alloys and having different shapes and sizes. CONCLUSION. The design of the developed device is characterized by simplicity and low cost; at the same time, it is based on a modern element base. The test results of the device showed that the relative measurement error is within acceptable limits, which allows it to be used to control products made of hard alloys in production conditions.