Sewing machine fastener standards and related peripherals are unified throughout the industry
According to the parts company, in the supporting production of sewing machine fasteners, the problems brought by the whole machine enterprise are many, such as the selection of materials and the hardness value labeling, and some enterprises have low carbon steel carburizing and quenching and tempering HRC. Values, while some medium carbon steels that require quenching and tempering are marked with HV values. In terms of technical requirements of the product, such as the combination of screws with spring washers and flat pads, the hardness value is HV400, and the combination screws in the national standard have no hardness value - because after the carburizing and quenching, the spring washer It will anneal inelastically.
Since the relevant data of the whole machine enterprise is mostly derived from surveying and mapping, the errors are also caused by the variety of specifications of the fasteners. For example, a composite slot screw with a head outer diameter of 7 mm has an outer diameter of 6.7 mm, 6.8 mm, 6.9 mm, 7 mm, and 7.3 mm. In terms of inspection, the inspection scales of various enterprises are not uniform, and the standards of thread gauges are not uniform. Some enterprises adopt 6g grade, some enterprises adopt 6h grade, and even some enterprises adopt them, resulting in sewing machine fastener manufacturing enterprises. Two different inspection results occur when the same batch of products produced are delivered twice. In these respects, it is necessary to form a more uniform standard in the whole industry.
Control the scientific design of sewing machine fasteners
Although the fasteners are small, they have a great influence on the performance of the sewing machine. In particular, if the fasteners attached to the moving parts of the sewing machine are defective, it not only affects the function of the sewing machine, but also directly affects the performance and quality of the product. Usually, the sewing machine fasteners are designed by the product developers of the sewing machine manufacturers. The level of their professional level directly affects the quality of the sewing machine fastener design drawings, which in turn affects the quality of the sewing machine fasteners.
A professional sewing machine fastener designer should be familiar with the material of the fastener, heat treatment, the relationship between the thread and the head size and the depth of the groove, and can choose different materials, processes and designs according to the requirements. Reasonable product size, etc. The current situation is that the product developers of the whole machine enterprise do not understand the material, process and manufacturing of the sewing machine fasteners. Especially in the selection of fastener materials, the understanding of the characteristics of different materials is not enough.
Even though these designers have an understanding of the common sewing machine fastener materials, heat treatment, manufacturing, etc., there are still many problems in the size design of the product. At present, there are many sewing machine manufacturers' fastener design drawings that are derived from the redesign of physical mapping. Some of the whole machine manufacturers have a more complicated design concept when developing new products, especially in the imitation models, often copying the size and structure, knowing why they don’t know why. When measuring the actual object, due to the manufacturing error of the component size on the prototype, the measurement size will also be different. The whole operation process is unscientific and non-standard, and will be directly reflected on the design drawing of the fastener.
Because the major machine companies are self-contained, and the fasteners of different varieties of the same enterprise also have independent systems, the fasteners of the same specification type have different product drawings reflected in different enterprises and models, and these different The technical parameters of the product drawings are often only slightly different, mostly a few millimeters. As a result, not only the machine and fastener manufacturers in the design, procurement, production, manufacturing process management, inventory and other aspects of the great waste and loss, but also the mapping error of the fastener dimensions will lead to the whole machine The sewing machine fasteners produced by the company's product drawings cannot be used, and the products produced by the fastener manufacturing enterprises in accordance with the national standard or the standard label cannot be accepted by the quality control department of the whole machine enterprise. Therefore, the designer of the sewing machine fastener should be familiar with the knowledge of the fastener, from the design to know what each fastener is used, how the standard size... Design the sewing machine fastener with a scientific attitude and method .
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