The key content of cutting technology of knitted loop velvet products is: to cut the loop surface of knitted loop products, the existing knitting machine can not cut the loop into the pile surface, which is a technical problem to overcome, so that the knitted loop velvet products do not need to carry out secondary velvet cutting on other machines, while bathroom knitted products can increase the softness, which is more comfortable to use and suitable for muffler wholesale Enterprises can save time, labor and efficiency. Cashmere knitting machine can improve the printing quality of printed cashmere cover, adapt to the development trend of printing industry at home and abroad, enhance the competitiveness of products in the domestic and foreign markets, improve the quality of products and improve economic benefits. It also breaks the monopoly of foreign counterparts on this technology. The cold extrusion forming technology of diesel engine tappet blank end face can save the blank material, reduce the processing time, reduce the processing cost and improve the appearance quality of the parts. The valve tappet parts of internal combustion engine need to be produced in large quantities. In the production process, the shape and position tolerance of each part should be further improved to reduce the poor size dispersion of parts. The modification of muffler can improve the processing and inspection ability of products.