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Common Problems and Cause Analysis of Cemented Car (8th Dec 22 at 1:44am UTC)Quote Reply
Original Title: Common Problems and Cause Analysis of Cemented Carbide Pressing Cemented carbide is a kind of alloy material made of hard compound of refractory metal and bonding metal by powder metallurgy process, which has high hardness, wear resistance, good strength and toughness. Because of its unique properties, it is often used to make rock drilling tools, mining tools, drilling tools, measuring tools and so on. It is widely used in petroleum and natural gas, chemical industry, engineering machinery, fluid control and other fields. Cemented carbide is a material pressed by powder metallurgy process. Today, Sidi Xiaobian will introduce to you several major problems we often encounter in the pressing process, and briefly analyze the reasons. 1. In the pressing process of cemented carbide, the common pressing waste product is delamination. It appears along the edge of the pressure block and forms a certain angle with the pressure surface, forming a neat interface called stratification. Most of the layering starts at the corners and extends into the compact. The cause of the lamination of the compact is the elastic internal stress or elastic tension in the compact. For example, the cobalt content of the mixture is relatively low, the hardness of the carbide is high, rock drilling tools , the powder or particles are finer, the forming agent is too little or unevenly distributed, the mixture is too wet or too dry, the pressing pressure is too large, the single weight is too large, the briquette shape is complex, the mold finish is too poor, and the table is uneven, all of which may cause stratification. Therefore, it is an effective way to solve the problem of delamination by improving the strength of the briquette and reducing the internal stress and elastic hysteresis of the briquette. 2. In the pressing process of cemented carbide, the phenomenon of not pressing well (showing particles) will also occur. Because the pore size of the green compact is too large, it can not completely disappear in the sintering process, which makes more special pores remain in the sintered body. The material particles are too hard, the material particles are too thick, and the material loose packing is too large; the loose packing particles are not evenly distributed in the mold cavity, and the single weight is too low. May result in poor pressure. 3. Another common phenomenon of pressing waste products of cemented carbide pressing is cracks. The phenomenon of irregular local fracture in the briquette is called crack. Because the tensile stress inside the compact is greater than the tensile strength of the compact. The internal tensile stress of the compact comes from the elastic internal stress. Factors that affect delamination also affect cracking. The following measures can be taken to reduce the occurrence of cracks: extending the pressure holding time or pressurizing for many times, reducing the pressure and unit weight, improving the mold design and properly increasing the mold thickness, speeding up the demoulding speed, increasing the forming agent,dth rock bit, and improving the apparent density of the material. The whole production process of cemented carbide is very critical. Xidi Technology Co., Ltd. specializes in cemented carbide production for 15 years. If you have any questions about cemented carbide production, please pay attention to the official website of Xidi. Return to Sohu to see more Responsible Editor:.
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