Heat treatment is the key process for the production of high-strength fasteners. For the first time, China introduced the decarburization requirements into the quality requirements of fasteners. At that time, few standard requirements were met. After years of efforts, gas-protection heat treatment furnaces have been widely used. The Chinese government attaches great importance to the quality of fasteners and has adopted a series of effective measures to organize dozens of national product quality inspections. The local technical supervision departments have also organized some local inspections of product quality, and adopted random inspections for unqualified enterprises. The punishment measures have played a positive role in improving the quality awareness of enterprises and improving product quality, and have received good results.
From the results of previous spot checks, the pass rate of spot checks is not high, and the overall quality status is still not satisfactory. The main reasons include: adjustment of industry structure and product structure, increase of new enterprises, increase of high-strength fastener manufacturers; market competition is fierce. Production costs increase, product prices decline, business operations are difficult; equipment is aging, technical strength is weak, technical transformation is not enough; detection methods are backward, inspection is not strict; materials and other supporting industries are restricted, standards and customer requirements are constantly improving. Influencing factors. From the economic point of view, the production of fastener products should be carried out in a reasonable and economical way. Deviation is a normal phenomenon. It is necessary to rely on inspection to control the quality. In production, problems and hidden dangers should be detected through testing, and corresponding measures should be taken to control the production process. .
Commonly used testing equipment in the production of fasteners include material testing machines, hardness testers, physical and chemical analysis equipment, microscopes and thread gauges, and other general purpose and special Measuring Tools. According to our understanding, some enterprises still do not have the necessary testing equipment, or the testing equipment can not be measured on time, or the side is not checked, resulting in lax internal control and unqualified products flowing into the market. Therefore, competent enterprises should establish a sound quality inspection system, strictly control the quality according to the standards and customer requirements. Enterprises that are not yet capable should establish a fixed relationship with the authoritative quality inspection organization or the enterprise with detection capability. Collaborative relationship, through the use of checks, in the absence of their own testing methods to achieve the purpose of controlling product quality.
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