Thread rolling machine for ordinary double-headed studs: North Shuanghuan Chemical Group Machinery Factory (Yingcheng 432407) Chen Hong ordinary bolts are one of the commonly used fasteners in the machinery industry, studs in chemical equipment, pipelines, machinery, etc. Widely used. The thread rolling machine has a wide application precision in the manufacture of double-head studs due to its high processing precision, productivity and mechanical properties. In the actual production, the double-headed studs are machined, and the polished rods are processed by a special machine tool, and the special thread forming processes such as a thread rolling machine and a wire-cutting machine are formed into a final thread forming process. However, the M12'M30 double-headed stud is processed, and the blank size is determined. There is no ready-made manual standard for reference. In this paper, the size of the polished rod is determined through practice, which can be used by peers. Our factory processes a number of batches of equal length double studs, the specifications are: M12) 80'M30) 180, the performance grade is 3.6'8.8, a total of tens of thousands of sets. Set 5 rolling machine, the maximum rolling pressure is 125kN, the material of the rolling wheel is 12M45. Stud material and composition, heat treatment state before processing according to GB/T3098.1-2000 requirements: double stud performance grade 3.6'6.8 grade, material With ordinary low and medium carbon steel, no heat treatment is required. The material hardness is less than 240HBW. As the performance level of the stud increases, the material and corresponding heat treatment requirements also increase. Our factory uses 35CrMA when processing 8.8 grade double studs. After quenching, the tempering hardness is 270HBW, the nut material is 30CrM., and the normalizing hardness is 240HBW. Before processing, it is strictly carried out according to the heat treatment process, and the hardness is qualified. The thread rolling machine adjusts the position of the rolling wheel and the support block before working, and checks the hydraulic drive system to make the rolling pressure uniform (see attached drawing). When the thread rolling machine is used to machine the thread, first adjust the position of the thread rolling die to prevent the axial displacement of the rolling workpiece due to misalignment. When the finishing hole is adjusted during rolling, the hole is no longer misaligned, and when the chamfering and the right end face are positioned by the hole, the solder joint is turned off, and there is no welding trace. After the screw is removed, the fully qualified part can be obtained. It is. The above enumerates three examples of the division and integration in machining. In actual work, according to different situations, using this method, we can find a suitable process route, reduce costs and improve labor efficiency. MW (receiving manuscript period) good cutting fluid, timely cooling, to avoid the tangential temperature of the rolling wheel due to dry friction caused by the dry friction of the rolling wheel, exceeding the tempering temperature of the rolling wheel, tempering softening, reducing the life of the rolling wheel. It is stipulated that the position of the thread rolling die such as the bolt and stud product is determined by the product quality and tolerance size 1. The rolling wheel 2. Double stud is required, and the A grade accuracy is the highest. 3. Since the support block has no ready-made experience, the different sizes of polished rods (different tolerances) are tested by lathe, and the repeated requirements are gradually summarized the required dimensions before the processing of the ordinary double-headed stud rolling machine (see attached table). Different specifications of ordinary double-head stud rolling machine before processing size requirements specifications polished rod processing size / mm thread tolerance rolling wheel precision product grade 2 in the manufacturing process, control of heat treatment process, polished rod size within the scope of expression, processing double Head stud tolerance, surface roughness, etc.
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