The further optimization of the current product structure is an important strategic shift for fastener companies. The gradual transformation of low-carbon steel hexagon nuts into A194 2H-class nuts mainly producing medium-carbon steel will enable the company to obtain more profitable space. For this reason, the quality has higher requirements on the production process and preparation of nuts. In the face of such structural adjustments, it is necessary to start the formulation of quality control plans and inspection specifications from the following aspects.
First, the preparation before the output;
The second is the random inspection in the output;
Third, the final inspection after delivery.
First of all, the pre-production preparation includes: related personnel, equipment status, mold equipment, production process, raw materials, etc.
However, the first item involves three major aspects: a, mold preparation; b, inspection method; c, the control of the production process, leading to higher requirements for these parts.
First look at the mold preparation: from order to mold planning to production, complete mold equipment is required. It can be considered that the production ahead provides satisfactory preparations and does not delay production due to molds. This requires sufficient inventory to ensure this cycle. Generally it is about 20-25 days.
Secondly, the inspection method: In this link, we should pay attention to the inspection of tools and methods. The most basic inspection tools we know include vernier calipers, micrometers, thread gauges, Rockwell hardness machines, tensile testing machines, etc., most of them Companies have always selected on-site follow-up inspection and sampling sampling methods.
Finally, it is the control of the output process: including appearance, method specifications, thread pass and stop, and mechanical properties. In order to ensure the use of the nut, we first control the first three items, and the appearance can be completed by visual inspection. In order to control the accuracy of the internal thread, it is necessary to make an inner diameter lubrication plug gauge. The inspector and the operator have one set, which can easily check the standard nut; others rely on the production accuracy of the forming mold and the adjustment of the sequence pressure during production to ensure ; The requirements for mechanical properties depend on raw materials and heat treatment to complete. And we often neglect the most important element-the cultivation of the nature of workers.
Everyone is a single person, with his own characteristics and habits. Essential training includes: the principle of handling things, the production environment of the goods, the ideological education of the operators, the technical proficiency of the operators and the personal cultivation of the staff, etc. For example, the hexagonal nuts we made are the same. The six corners have six edges, and each edge is an important element.
Let our fastener companies not only produce high-quality hexagon nuts, but also cultivate a group of talents. This is where the vitality of the fastener company lies, and it is also where the quality advances.
What is the difference between high-strength nuts and general nuts, in fact, you only need to understand their standards and other characteristics to easily distinguish them. The so-called high-strength nut is a special bolt with high strength and high fatigue resistance used in special equipment or engineering. Of course, generally high-strength nuts are used with high-strength bolts to achieve better application. We generally see that many bolts with M heads in the market are ordinary nuts, not high-strength nuts. The calibration side of the general hexagonal head nut is the following pattern M30, and M30 indicates the thread standard, that is, the inner diameter of the thread is 30mm. Grade 10 indicates the functional grade of the bolt, and tZn is the surface treatment method. Other types of bolts also have their own expressions, but generally threaded bolts have to use the original functional grade of "M": The functional level of the nut is divided into 3, 4, 4, 5, 5.8, 6...
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