Misunderstanding of tool selection for steel castings: There are two common problems in steel castings that are difficult to machine: (Source: Valin is super hard, and the source should be indicated when reprinting or quoting) 1, steel castings contain manganese, chromium and nickel, which makes the tools not wear-resistant when cutting, especially for some large steel castings, many tools are damaged before machining a workpiece, resulting in cutting marks or even "stabbing". 2. There are casting defects such as sand inclusion and white mouth. Or intermittent turning, the tool is easy to collapse, resulting in high use cost of the tool. First, the misunderstanding of tool selection in cast steel processing: At present, many tool engineers and some steel casting processing plants often choose YT alloy tool tips or coated cemented carbide tools for P-type metal processing, but it is not; 1, we should jump out of the misunderstanding that "steel parts are processed with YT alloy tool heads and iron castings are processed with YG tool heads", because cast steel is a short chip material, which is different from forged steel parts! Especially in the rough machining or intermittent turning of steel castings, if YT alloy cutter head is used, the cutter will generally collapse! 2. If YG alloy or coated cemented carbide blades are used, if the blade collapse occurs, it cannot be simply attributed to the YG blade's non-impact resistance, but in fact, in the final analysis, it is the reason for its non-wear resistance (for details, see "Analysis and Countermeasures for Difficult Machining of Ferrous Metal Castings"). Second, the correct choice of tool material for steel castings is 1. If a single piece is produced occasionally, YG or yw alloy blades can be selected for rough machining. If the rigidity of the system is insufficient, the main deflection angle is 83 degrees or 90 degrees (depending on the machining requirements of the end face and the shoulder). If the machine tool has good rigidity and clamping force, try to use a turning tool with a main deflection angle of about 45 degrees. 2. If the steel castings are processed regularly in batches, the slag inclusion is intermittent during rough turning or the workpiece is large, you can try to use cubic boron nitride integral polycrystalline blade; The picture shows the scene of processing steel castings.