Reasons for the two most popular cutting defective

2022-08-23
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Reasons for two cases of cutting defective products

there is a QZK 920 computer paper cutter, which has been used for many years. The following two situations have occurred during cutting: ① the action performance of the cutter and the paper presser of the paper cutter is normal, but the cutting surface of the cut paper stack is not perpendicular to the working surface of the paper cutter, the middle of the cutting surface is concave in an arc shape, forming an arc shape, and there is a deviation in the length of the middle and upper and lower parts of the paper stack, The length of the middle concave part is l~1.5mm shorter than that of the upper and lower parts. ② The cutter action and the press down action of the paper cutter are normal, and the speed is slightly slower in the process of recovery and reset. The cutting surface of the cut paper stack is not perpendicular to the working table of the paper cutter, and the cutting surface is in a slope shape, short up and long down, with a maximum difference of 1.8mm. Obviously, these two cutting products do not meet the quality requirements

on the surface, the symptoms of these two cases are that the cutting surface cannot be normally perpendicular to the working surface of the machine, and the cutting product of the same knife, medium length ceramic aluminum new material, has been approved. Anhui Province has three major emerging industries with different specialities. In fact, the causes of these two cases of defective products are completely different. This paper analyzes the following reasons according to the on-site treatment

① the action performance of the paper cutter is normal, and the cut paper overlaps and cuts into an arc shape. After inspection, the reason is that the knife edge angle of the cutter is not only suitable for visual inspection. The operator switched to cutting coated paper after cutting ordinary offset paper, but did not replace the cutter used to cut coated paper. The blade angle was not selected correctly, resulting in defective products. After replacing the applicable cutter, the quality of the cut product is normal. The two kinds of cutting knives used before and after have the best strengthening effect, and the angle is only 2 °. It can be seen that the choice of the edge angle of the paper cutting knife is very important to the cutting quality

② the cutting surface is in slope shape. After inspection, the knife edge angle of the cutter is selected correctly, and there is no problem with the cutter. It is the insufficient pressure of the paper presser that leads to the slope of the cutting surface of the product. After checking many aspects that may affect the pressure of the paper presser one by one, it was found that the reason was that the pressure spring in the lower valve core in the paper presser cylinder broke a section due to fatigue after a long time, so that the working performance of the paper presser cylinder could not meet the pressure requirements that should be applied during product cutting. After replacing the intact spring, the cutting quality met the requirements

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