Corrosion-resistant and anti-EDM cracking-resistant mixed crystal hard alloy and manufacturing method

Abstract

The invention relates to a cemented carbide manufacturing technology, in particular to anti-corrosion anti-EDM-processing-cracking mixed crystal cemented carbide and a manufacturing method. The anti-corrosion anti-EDM-processing-cracking high-performance mixed crystal cemented carbide is composed of, by mass percentage, a composite hard phase comprising 25-50% of WC with the particle size of 0.4-0.8 micrometers and 35-60 % of WC with the particle size of 1.0-2.5 micrometers, a binding phase comprising 10-15% of Co, a corrosion-resistant additive comprising 0.05-0.3% of Re and an inhibitor comprising 0.1-0.5 % of Ta and is manufactured through the processes of burdening, ball milling, blank manufacturing and sintering. The anti-corrosion anti-EDM-processing-cracking mixed crystal cemented carbide and the manufacturing method have the beneficial effects that the corrosion resistance of the cemented carbide is high, the anti-EDM-processing-cracking characteristic is good, the quality is stable, and the manufacturing method is convenient and reliable.

Description

technical field [0001] The invention relates to hard alloy manufacturing technology, in particular to a mixed crystal hard alloy resistant to corrosion and cracking during EDM processing and a manufacturing method. Background technique [0002] Nowadays, with the continuous improvement of mold precision and use requirements in aerospace, automobile, electronics, electromechanical and other industries, the advantages of high hardness and high strength of cemented carbide are favored by various mold industries, and more and more main jobs in molds Some of them have used cemented carbide to replace the original die steel (for example, the weight of cemented carbide material in a progressive die instead of die steel is hundreds of kilograms), these cemented carbide materials need to rely on EDM processing for final molding, This makes mold manufacturers have very strict requirements on the alloy materials used. During the corresponding EDM processing, the alloy materials are cor...

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Problems solved by technology

[0002] Nowadays, with the continuous improvement of mold precision and use requirements in aerospace, automobile, electronics, electromechanical and other industries, the advantages of high hardness and high strength of cemented carbide are favored by various mold industries, and more and more main jobs in molds Some of them have used cemented carbide to replace the original die steel (for example, the weight of cemented carbide material in a progressive die instead of die steel is hundreds of kilograms), these cemented carbide materials need to rely on EDM processing for final molding, This makes mold manufacturers have very strict requirements on the alloy materials used. During the corresponding EDM processing, the alloy materials are corroded by the processing current and coolant, which affects the precision of the mold. The cracking of the alloy material during the processing leads to the scrapping of the entire set of molds, which has become an urgent need. solved problem

At present, the main grades of domestic cemented carbide EDM processing plates are YG12, YG13, YG15, etc. In the production process of these grades, they are all produced with traditional single-size WC powder + Co, without considering the impact of current and coolant during EDM processing. Corrosion of alloy materials and easy cracking during processing. The disadvantage of a single powder is that it cannot make the material have the characteristics of high strength and high hardness at the same time, that is, it cannot make the product have the characteristics of wear resistance and impact resistance at the same time; and the bonding component is only Cobalt is an element, and the oxidation resistance and corrosion resistance of cobalt are poor, which leads to defects such as corrosion and cracking in alloy materials during EDM processing; at the same time, at high temperatures, WC grains dissolve in liquid cobalt, which is easy to cause Abnormal growth of WC grains

With the expansion of the scope of use of cemented carbide sheets processed by EDM and its application in various environments, it is difficult for domestic cemented carbide to meet the use requirements

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