In the “Eleventh Five-Year Plan†of the industry, sewing machine fasteners (screws), needles and rotary hooks were included in the project. After the efforts of related companies in the past four or five years, the production equipment and technology of sewing machine fasteners have been innovated and made great progress. Huayi has developed into the largest sewing machine fastener enterprise in China. Now take the example of the process and technology of sewing machine fasteners. The production of sewing machine fasteners has passed the "wool", "spheroidization", "drawing", "cold", "cutting", "milling", "twisting", "heat treatment", Processes such as “grinding†and “surface treatmentâ€. There are corresponding requirements for the setting of process parameters in each link. For example, in terms of material selection, nut type, screw larger than M4 and spring pin type, 15 (15#) steel should be selected; the core strength of the fastener is high and the surface is subject to wear, which is larger than M4 screw and shaft position. The selection of the screw is 20 chrome steel (20Cr). If there is a part with high core toughness, strength and wear resistance, the tightening screw smaller than or equal to M4, the screw with less than or equal to M4, etc. should be selected as SCM415 type. Steel; hexagon socket (including hexagon socket) screws, hexagon socket screws, steel of SCM435 type. In the sewing machine fastener production technology, such as the current "spheroidizing" process, in the past only the annealing method, resulting in fasteners in the subsequent processing and quenching process is prone to deformation and cracking, and now the use of "spheroidization After annealing, the spherical pearlite structure is obtained. The cementite is spherical particles and is dispersed on the ferrite matrix. The hardness is low and the surface is not easy to decarburize, which makes the material with low sulfur content, stable and reliable, and easy to process. Further, in the case of quenching heating, austenite grains are not easily grown, and the tendency of deformation and cracking of the workpiece during cooling is small. Another example is the “cold squatting†link, which uses multi-station cold-sleeve equipment such as two-mode four-stroke, three-mode three-punch and five-mode five-punch, which can reduce the subsequent processing steps and ensure the consistency of product size. Another example is the “heat treatment†process, which uses carbonitriding technology. This is because the special screws for sewing machines require high hardness, high wear resistance, high impact toughness and fatigue strength. Conventional heat treatment is a carburizing process. In the face of technical problems of deformation control, the scrap rate is high, and the carbonitriding process can reduce deformation and improve the hardenability of the product.  Sewing Machine Fastener Quality Improvement Seminar Held in Ningbo, Zhejiang Flap Wheels
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