Special-shaped parts, that is, some complex and irregular parts, for simple cuboid and shaft parts, the use of common processes and fixtures can meet their requirements; for the processing of such complex or irregular parts, general The processing method is difficult to meet its requirements, and the processing technology is quite complicated. The use of scientific process flow and special tooling equipment can better solve the processing of such parts, especially in batch processing to ensure the smooth progress of the processing process. 

Special-shaped parts are generally small in size and complex in shape, and the parts are not easy to be clamped. The clamping method of combined clamps is generally used in processing. The clamp elements are used to ensure the coincidence of the positioning benchmarks for multiple clampings, and the clamps are used to clamp the workpiece.

The design characteristics of heterosexual parts are their dimensional tolerances and high geometric tolerances. When designing the processing technology, in order to ensure accuracy and prevent deformation during processing, the principle of process dispersion is often used in previous processing, and rough and fine are processed separately. Milling, grinding, boring and other processes, resulting in too many processing steps.

Difficulties in the process of special-shaped workpieces: With the popularization and application of CNC laser cutting technology, it is found that there are defects in the cutting of some special-shaped parts, small external dimensions, and workpieces with a thickness of ≥3mm are prone to melting and burning defects at sharp corners. It is difficult to guarantee the appearance and outline size of the workpiece. For some slender workpieces less than 1.5mm, as the ratio of length and width increases, the workpiece will appear thick at both ends and fine in the middle. The size of the workpiece is difficult to meet the requirements of the drawing, resulting in inaction waste .

Then how to solve the cutting defect of heterosexual parts, according to the different geometric contours, parameters and materials of special-shaped parts, reasonably select the process parameters and processing sequence of laser cutting, and adopt appropriate processing methods to eliminate processing defects, so as to ensure the quality of the parts. Processing quality.

1. Transition lead method

Due to the small size of the parts, the fast cutting speed, and the starting temperature before cooling, the cutting and arcing must be repeated. The starting point and the end of the workpiece are severely burned, and the irregular contour is difficult to meet the size and cutting surface roughness requirements, so the starting point And the end point is led to the cutting waste area outside the workpiece, avoiding the coincidence of the start point and the end point, and completely eliminating defects such as workpiece burning after cutting.

2. Interval point method

For plate workpieces with a large aspect ratio (L/B), with the difference between the ratio and the thickness of the workpiece, the parts will be deformed, and there will be defects in cutting. For such defects, the material of the plate should be different. The cutting method adopted is also different. For carbon steel plate workpieces, which need to be chemically treated or painted later, and the roughness of the cutting surface is not high, the micro-welding (or micro-connection) method that comes with the CNC laser cutting machine can be used for processing. For stainless steel workpieces, due to the strict appearance requirements, micro-welding can easily cause welding fusion marks and cannot be easily eliminated, which affects the appearance quality of the parts.

3. Symmetrical cutting method

The symmetrical cutting method can shorten the cutting trajectory, reduce the cutting time, and avoid the deformation and melting defects of the workpiece caused by repeated cutting in a short period of time.

JAVA Metal can provide the customised processing services of cold-rolled plate, hot-rolled plate, galvanized plate, copper plate, aluminum alloy, stainless steel and other materials.