An Evaluation Method for the Maximum Grinding Times of Tools

Abstract

A method for assessing the maximum sharpening frequency of a cutter belongs to the technical field of cutters. The method comprises the following steps: 1, selecting an initial cutter, respectively performing indentation test on a sharpened cutter and the initial cutter by adopting the same pressure, and allowing the indentation area of the sharpened cutter to be positioned in a sharpening area; 2, measuring the diagonal length a1 of the indentation area of the sharpened cutter and the length b1 of a crack generated in a diagonal extending line, and measuring the diagonal length a2 of the indentation area of the initial cutter and the length of a crack generated in a diagonal extending line; 3, calculating the change ratio V1 of the diagonal length according to the following formula: V1 =a1 / a2, calculating the change ratio V2 of the crack length according to the following formula: V2 = b1 / b2, and calculating the processing performance change ratio V of the sharpened cutter according to the following formula: V = max{V1, V2}; and 4, calculating the processing performance degrease percentage C of the sharpened cutter by using the following formula: C = V-1, according to the processing performance change ratio V, and obtaining the maximum grinding frequency of the sharpened cutter when C = 0.5.

Description

technical field [0001] The invention relates to the technical field of cutting tools, in particular to an evaluation method for the maximum grinding times of cutting tools. Background technique [0002] Titanium alloys and high-temperature alloys with high strength and high corrosion resistance are widely used in aerospace engines, and the use of titanium alloys and high-temperature alloys in new aeroengines is also increasing. Titanium alloys and high-temperature alloys have excellent performance, but they are also extremely difficult to process. They are difficult-to-machine materials, and they have very high requirements for cutting tools. service life. [0003] The materials and machining accuracy of the cutting tools used to process aerospace components are significantly higher than ordinary cutting tools. Therefore, the cost of cutting tools is also much higher than that of ordinary cutting tools. In order to improve the utilization rate of cutting tools and reduce co...

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Problems solved by technology

[0004] Usually, a worn tool will be regrinded multiple times, that is, it will continue to be used after the first grinding, and the tool will wear again after a period of use. At this time, the tool will be regrinded for the second time, and so on. , but the self-performance of the cutting tool after repeated grinding is lower than that of the initial cutting tool when it leaves the factory. The method is used to determine the maximum number of grinding times of the tool. It is often judged whether the tool can continue to be ground by changing the appearance of the tool. The judgment error is relatively large. There is a sharp non-linear decline in the processing performance of the tool, and it is very easy to break the tool suddenly during use, resulting in economic damage such as damage to the workpiece or damage to the machine tool; Making full use of the tool wastes resources, therefore, how to quickly and accurately evaluate the maximum number of grinding times of the tool is extremely important

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