Ⅰ. Common problems in machining of large steel castings
1. Steel castings contain manganese, chromium, and nickel, which makes cutting tools not wear-resistant, especially for some large steel castings. Many tools are damaged before processing a workpiece, resulting in tool marks or even "knives". The light ones will affect the processing efficiency and processing quality, and the heavy ones will cause the workpiece to be scrapped.
2. There are casting defects such as sand inclusion and white mouth or intermittent turning, which is easy to break the tool, resulting in the high cost of tool use.
Ⅱ. Misunderstandings in the selection of CNC blades in the processing of large steel castings
At present, many tool engineers and some steel casting processing factories often choose YT alloy tool heads or coated carbide tools for P metal processing.
1. Everyone should jump out of the misunderstanding that "steel parts are processed with YT type alloy cutter heads, and cast iron parts are processed with YG type cutter heads", because cast steel is a short chip material, which is different from forging steel parts. Especially when rough machining or intermittent turning of large steel castings, if a YT alloy cutter head is used, it will generally break.
2. If YG-type alloy or coated carbide blade is used, if there is no chipping phenomenon, the responsibility cannot be simply attributed to the fact that the YG-type blade is not resistant to impact. In fact, it is the reason for its inability to wear.
Ⅲ. Correct selection of tool materials for processing large steel castings
If it is a one-piece occasional production, YG alloy cutter head can be used for rough machining. The sharpening angle of the specific front and rear corners is similar to that of machining cast iron parts. According to the machining process and the rigidity of the machine tool system, the appropriate tool leading angle can be ground.
If the rigidity of the system is insufficient, the entering angle should be 83 degrees or 90 degrees (depending on the machining requirements of the end face and shoulder). If the rigidity of the machine tool is good and the clamping force is good, try to use a entering angle turning tool of about 45 degrees.
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