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Hard Alloy More And More Extensive

Hangzhou JWG Technology Co.Ltd | Updated: Aug 10, 2017

Large-scale tube parts with high strength, high-temperature resistant Special steel 2.25cr-1mo-0.25V, in the roughing process, the material removal amount and the back eating knife quantity are very big, Hard Alloy causes the cutting area temperature to be up to 1000 ℃ above, causes the cemented carbide tool in the actual processing the invalidation to be quite serious, such as the tool attrition failure, Hard Alloy the collapse blade, the bond breakage and so on With the development of modern science and technology, high temperature toughness, high temperature viscous strong hydrogen-containing tube materials are more and more widely used, but the cutting machinability is poor, especially the surface covering of the nodular forging blanks contains a lot of Mn, CR and FE and other high hardness elements, so that during the cutting process workpiece-cutter-chip contact surface will be intense friction, so that the cutting zone temperature rise, high temperature reaction to the tool, Hard Alloy speed up the wear or damage of the vehicle knife, Hard Alloy so that the final failure. Li Yimin The wear rate of the front face of TI alloy cutting tools was numerically simulated, and the factors affecting the diffusion wear rate were studied. Li Zhenga, the cutting heat model is established under various conditions, and the tool breakage caused by cutting heat is studied extensively. However, Hard Alloy the cutting temperature has less research on the tool wear in the machining of large tube materials. Therefore, the wear of cemented carbide tool in cutting process is studied, the influence rule of cutting temperature on tool wear is expounded, Hard Alloy the production efficiency of heavy-duty high efficiency machining and the construction of major engineering project of chemical industry and nuclear power in China are of great practical significance and application value.

The cutting speed has the most effect on cutting tool wear, in order to make the test more specific, fixed cutting depth and feed, select different cutting speed for single factor test, Hard Alloy set two blades per set, and the cutting dosage is shown in table 3. By consulting the relevant literature and combining with the actual processing process, cutting tool wear effect is more obvious every 3 minutes, Hard Alloy so every 3 minutes with the ultra depth of field microscope to the two groups of knives before and after the knife surface wear, at the same time using a scanning electron microscope to detect the elements of the front and rear knife surface analysis.

The test blade is placed on the sample table, and the fifth experimental blade is observed by adjusting the distance between the lens and the blade and the magnification of the lens, and fig. 2 is the wear of the cutter face of one of the blades at different cutting time. Hard Alloy It can be seen from the figure that the main wear type of the front knife surface is crescent SAG wear, but it is quite different from the usual crescent SAG wear. The wear is distributed at the Chamfering point of the main cutting edge, the wear area is directly connected with the main cutting blade, the abrasion is most intense near the main cutting edge, and the cutting temperature is also highest (see fig. 3a). Hard Alloy Through the comparison of the high temperature area and the wear area of the tool front cutter surface (see fig. 3b), here the cutter face and chip contact is the most close and frequent, Hard Alloy the most intense friction, resulting in the highest temperature, and high temperature reaction to the tool, aggravating the tool wear here. In the early stage of cutting, the wear area (close contact area) is basically parallel with the front knife surface and the abrasion surface is relatively coarse, which shows that the mechanical wear is taken place and the leading role is occupied. As the cutting is done, the depth of wear here is obviously higher than that of the cutting edge, Hard Alloy and a small amount of workpiece material can be bonded to the surface; As the cutting temperature increases, the wear of the front face Crescent SAG becomes smoother, Hard Alloy indicating that the leading wear mechanism has changed, and the tool face has been oxidized.


Hangzhou JWG Technology Co.Ltd