Recently we made a batch of stainless steel parts.The accuracy requirement is very high, which needs to reach ±0.2μm. The material of stainless steel is relatively hard. In the CNC machining of stainless steel materials, corresponding measures can be taken from the pre-processing preparation, processing process control and post-processing to improve the processing accuracy. The following is the specific method:
Pre-processing preparation
• Choose the right tool: according to the characteristics of stainless steel materials, such as high hardness, toughness, etc., choose a tool with high hardness, high wear resistance and good adhesion resistance, such as tungsten cobalt carbide tools or coated tools.
• Optimize process planning: formulate detailed and reasonable processing process routes, reasonably arrange roughing, semi-finishing and finishing processes, and leave a processing margin of 0.5-1mm for subsequent high-precision processing.
• Prepare high-quality blanks: Ensure uniform quality of blank materials and no internal defects to reduce machining accuracy errors caused by the material itself.
Process control
• Optimize cutting parameters: Determine the appropriate cutting parameters through testing and experience accumulation. Generally speaking, the use of lower cutting speed, moderate feed and small cutting depth can effectively reduce tool wear and machining deformation.
• The use of suitable cooling lubrication: the use of cutting fluids with good cooling and lubrication properties, such as emulsion containing extreme pressure additives or synthetic cutting fluids, can reduce the cutting temperature, reduce the friction between the tool and the workpiece, inhibit the production of chip tumors, thereby improving the processing accuracy.
• Tool path optimization: During programming, the tool path is optimized, and a reasonable cutting mode and trajectory are adopted to avoid sharp turning of the tool and frequent acceleration and deceleration, reduce the fluctuation of cutting force, and improve the quality and accuracy of the machining surface.
• Implementation of online detection and compensation: equipped with online detection system, real-time monitoring of workpiece size and shape errors in the process of processing, timely adjustment of the tool position or processing parameters according to the detection results, error compensation.
post-processing
• Precision measurement: Use CMM, profiler and other precision measuring equipment to comprehensively measure the workpiece after processing, obtain accurate size and shape data, and provide a basis for subsequent precision analysis and quality control.
• Error analysis and adjustment: According to the measurement results, analyze the causes of machining errors, such as tool wear, cutting force deformation, thermal deformation, etc., and take appropriate measures to adjust and improve, such as replacing tools, optimizing processing technology, adjusting machine parameters, etc.
Post time: Dec-20-2024