Hard alloy impact fatigue testing method

An impact fatigue and cemented carbide technology, which is used in the application of repetitive force/pulsation force to test the strength of materials, etc., can solve the problems of no impact fatigue detection method for cemented carbide products, hindering the development speed of new products, and increasing research and development costs.

Active Publication Date: 2009-12-23
ZHUZHOU HARD ALLOY GRP CO LTD
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Problems solved by technology

However, there is no impact fatigue detection method for cemented carbide products. Therefore, in the development process of cemented carbide buttons, brazing pieces, stamping dies, plates and other products, it is often necessary to do multiple field tests, and field tests often require more than half a year. The test time seriously hinders the development speed of this type of new product and increases the cost of research and development

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  • Hard alloy impact fatigue testing method

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Embodiment Construction

[0016] Attached below figure 1 , the detection method, standard sample, indenter and specific detection process of the cemented carbide impact fatigue performance of the present invention are described in detail.

[0017] The sample material adopts three typical cemented carbide grades YG6, YG15 and YG20.

[0018] The sample is made by typical cemented carbide production process. That is, Co powder and WC powder with a certain composition are firstly wet-ground, mixed with molding agent after drying, and pressed into a thin-walled cylindrical blank. The sintering temperature is 1410-1450°C. The thin-walled cylindrical sample 3 preferably has an outer diameter of Φ16 mm, a wall thickness of 3.5 mm, and a height of 20 mm. The properties of the three grades are shown in Table 1.

[0019] A round table or conical indenter 2 made of hard alloy is prepared by the same process, the hardness is greater than HRA90, and the diameter of the bottom surface of the round table or cone ty...

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Abstract

The invention provides a hard alloy impact fatigue testing method sequentially comprising the following steps: (1) preparing a hard alloy standard sample with a thin wall and in a cylinder shape, and a platform or a conical squeeze head, wherein the diameter of the bottom surface of the squeeze head is larger than the diameter of a bore of the standard sample; (3) adjusting the strength of impact energy; (4) starting up an impact fatigue machine and a cam rotary knob, driving a punching head to do vertical, reciprocating and free-falling movement to enable the punching head to impact the bottom surface of the squeeze head, transferring the impact energy to the standard sample till the standard sample breaks, and taking the impact time and the impact energy of the breaking at the moment as the impact fatigue value of the hard alloy. The invention can fast test the impact fatigue performance of the hard alloy, thereby effectively shortening the research and develop time of hard alloy products and saving research and develop costs.

Description

technical field [0001] The invention relates to a method for detecting the impact fatigue resistance of cemented carbide, in particular to a method for detecting the impact fatigue resistance of cemented carbide by impacting a standard sample multiple times with small energy. Background technique [0002] In recent years, with the rapid development of my country's mining industry and mold industry, the demand for high-performance cemented carbide buttons, brazing pieces, stamping dies, and plates is growing rapidly at home and abroad. Such cemented carbide products will be subjected to intermittent and high-frequency impacts under actual working conditions. Practice has shown that the service life of this type of product is closely related to its impact resistance performance. If the product has a strong ability to resist small energy impact, the product will not be easily damaged, broken teeth, and broken during use, and the service life of the product will also be long. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/34
Inventor 张颢
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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