Second, use the hardness tester to test and verify the medium and large complex structure mold process This is a feed mold made of martensitic stainless steel, mainly used for the production of feed. There are 10,000 to 27,000 holes in the mold, and 10 tons of mixed feed powder per hour is extruded from the die hole area into pellets. Therefore, the key control point of the mass and service life of the ring mold is the hardness and permeability of the die hole area on the ring die. The following is a physical picture of the die hole wear: Because the mold size is large, and the die hole is distributed on the outer circle, the test point is a curved surface, and the spacing between the hole and the hole is generally 3 to 4 mm. Under such conditions, the various applicability of the Leeb hardness tester and the compact carrying are just played. Convenient features enable accurate testing of the actual hardness at the die hole. According to the measured hardness and the metallographic analysis of the test block, the process can be corrected and formulated more reasonably, and the material potential can be fully utilized to improve the service life. If the ring mold produces 10 tons of feed in one hour, when the service life is extended for 10 hours, 100 tons of feed can be produced, which will bring huge economic benefits to the enterprise. Third, the role of the hardness tester in the failure analysis of tool and die Material 5CrMnMo large hot forging die often fails in use due to early wear and collapse of the cavity. When the hardness was tested on the wear zone using a Leeb hardness tester, it was found that the hardness value of the grinding was lower than the hardness (38 to 42 HRC) tested before use, in the range of 32 to 34 HRC. This shows that in the second stage of heating the red hot blank (>10000C) to the cavity (the blank can be divided into four stages in the cavity heating), the heat is about 80% to 85%, due to the cavity wall. The heat dissipation is slow, and the temperature in some dot areas is as high as 6500C or more. When the temperature of the mold cavity exceeds the tempering temperature of the mold due to conduction and heat, the mold is in the process of continuing the tempering process during the working process, and the change of the structure and the performance will continue to occur, resulting in the decrease of the hardness value of the wear zone and the heat generation. Wear and tear, it shows that 5CrMnMo hot work die steel is not suitable for large molds. When using hot working die in the temperature range of 600~6500C, such as 3Cr2W8V, 3Cr3Mo3VNb, hot work die steel with thermal stability, heat strength and yield strength is more suitable than 5CrMnMo. In the case that China's industrialization process is still far from being completed, there is an urgent need to work hard to shorten the gap with the international advanced manufacturing level. As a company must recognize the heat treatment industry from a strategic perspective, not only from equipment, technology, and especially inspection equipment. The absorption of new technologies at home and abroad depends on the actual production and application in heat treatment enterprises. This is a very sensible move, because after the accession to the WTO, there is a five-year transition period according to the WTO rules. This is a very critical period for China's manufacturing industry. The reason is that it is because of the post-transition period. Enterprises will basically be in the same competitive position as large foreign companies, and in this transition period, we can fully prepare to enhance competitiveness, so this is a very urgent requirement for enterprises. Angle Valve, Brass Angle Valve, Fashion Angle Valve, Standard Angle Valve
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