Used Pu Sandwich Panels,Cheapest Sandwich Panel,Sandwich Panel Willing International Co., Ltd. , http://www.hz-rollformingmachine.com
For the heat treatment of fasteners, although the material has been determined at the time of design, its own factor can not be controlled, but in the processing, transportation, inventory, and work of heat treatment production, mixing, wrong materials, loss, rust, bump and deformation will often occur. The factors affecting the heat treatment quality of high-strength fasteners can be worked seriously and effectively by relevant personnel to avoid the occurrence of undesirable phenomena such as mixing, missing materials and wrong materials. The inspection department is required to do a good job in the inspection of materials, status marking work (such as different color steels by different colors of oil painting), material storage department to do the identification of materials, lead, handling, storage; production department work carefully and meticulously Do a good job in the identification, storage and storage of work-in-progress, find problems in time and notify relevant departments to deal with them in a timely manner. In the heat treatment production, many high-strength fastener material problems can be solved by the corresponding process technology as soon as they are found. For example, the quenched bolts later found that the grade 35# steel was misused with ML35 steel, and the tensile strength was reduced after the tempering temperature was lowered. The longer-scale bolts exceeded the standard, and the corresponding straightening process could be solved. The surface of the fastener is rusted and can be blackened again after pickling, and the scale can be solved by sandblasting. Of course, solving the problem "after the fact" is a last resort and must be done with caution.
4, process specifications (law)
Heat treatment is an important process in the processing of high-strength fasteners and plays a key role in improving the market competitiveness of fastener products. Heat treatment is essentially a process that improves its performance, service performance and service life by tightly controlling the heating and cooling process of the material.
The heat treatment production technology is very theoretical and practical. It must have a suitable heat treatment process plus a relatively complete working specification to control the heat treatment quality. From the perspective of quality control, the heat treatment process should be based on the specific high-strength fastener materials and related equipment tooling and the staff's operational skills to select appropriate process parameters, heat treatment technicians must be familiar with the production site, and constantly improve the process through practice. And continuous improvement. The heat treatment process for high-strength bolts above 10.9, nuts with grade 10 or above, or new materials with special requirements shall be implemented with the on-site construction workers and operators. The original records shall be strictly in accordance with the requirements of the quality control documents. Take corrective actions in a timely manner. In addition, strict process change control is required. Implement changes in accordance with the process file control program.
The technical document storage department shall do a good job in the management of technical documents to ensure that the drawings, technical documents and quality control documents used at the production site are complete, complete, uniform and clear. The heat treatment production operation personnel must strictly implement the process discipline, and operate according to the process. The parameters (time, medium, equipment, process, etc.) must not be changed arbitrarily. Managers, technicians, inspectors, etc. are required to conduct regular process discipline inspections on a regular basis, and problems are seriously dealt with.
5, the conclusion
In order to prevent the quality of fastener products due to changes in 4M (person, machine, material, and method), it is necessary to stipulate management measures that affect the four major factors that affect the quality of heat treatment. Strengthening 4M management, the personnel factor is the most critical. An excellent fastener heat treatment worker must not only have a certain degree of accomplishment in heat treatment process, metal material and metallographic analysis, but also be familiar with the heat treatment equipment and go to the site to handle the process by hand. That is to say, he must be rich. Work experience. Of course, there are too few talents in the real enterprise to develop comprehensive fastener heat treatment. In order to do a good job in the quality of fastener heat treatment, including the quality of fastener products, it is necessary to grasp the training of talents, and it is also the way out for enterprise development. Previous page 1 2
3, fastener materials (material)