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Single-cone second perforation test

Pipe size design pass,[link widoczny dla zalogowanych], when the production of different specifications of the stock, it will produce different levels of external threads, and the adaptability of a single cone is strong. 2.2.2 Deformation and perforation of a second difference in deformation of a hole punch to change the form of l-shaped main section blank, blank bite into the front section in a greater degree cut. As long as the total amount of compression according to certain (empirical data) can be determined from the roll. Deformation of the second hole extends primarily to Roll, capillary rigidity is very low,[link widoczny dla zalogowanych], if the value of an improper bite compression value fashionable, easy to head for the capillary pressure caused by fans before the card after the card caused by flattening the tail. So the right to determine the longitudinal axis of the ellipse pass coefficient and a reasonable allocation of the first and second bite ratio of deformation between the perforation and a perforation is the second biggest difference. 2.2.3 Secondary perforation tool and die workers touch with the consumption of consumption (especially immediate consumption) (continued on page 43) steel effect so that the temperature rise in the immediate decrease in the perforation. 4CroSiVl Steel Plug better cooling measures imposed in the normal continuous perforation, the head of work force with the maximum temperature is generally about 600 ℃,[link widoczny dla zalogowanych], can basically avoid the wear deformation. 4, the first use of qualitative research results braided developed in Tianjin Seamless Steel Tube Plant new head unit application of +76 mm, and achieved good results. 1st try 2 head, in close collaboration with workers at the scene, the first one to reach 1128 times the service life of head. 2nd Trial head 8, the average life of 795 times. From the field situation, due to lack of experience with the new head, cooling water of the problems are more immediate because of water main five broken nose after the shift caused by wear and tear disabled, were wearing tube 3506, the average life span is 701 times The cooling water pipe did not trouble the three were wearing head tube 2855, the average use of 951 times. It is suggested that the immediate development of stable performance, the relationship between life and field use conditions, a large, three were normal cooling of the head perforation 915,[link widoczny dla zalogowanych],947,993 times. The new head has developed a large supply of Tianjin Seamless Steel Tube Plant, the service life of about stable at 800, some as high as 1,500 times. Also developed a three-roll piercing mill factory with the immediate introduction of the CPE units for the use of life 1,300 times. 5 Conclusion 5.1 The development of the high life of head in the piercing process, the shape and size to maintain good, worn by the capillary inner wall of the quality and dimensional accuracy, and the equipment load and energy consumption are reduced. 5.2 The design, manufacture high-life immediate need for specific conditions of use. Head design and reasonable should be considered equipment,[link widoczny dla zalogowanych], process conditions, especially the scene of the cooling conditions. 5.3 Heat treatment is to ensure a reasonable head the key process of life. Immediate high-temperature diffusion annealing after forging joint process, finished double quenching. 5.4 The head must be reasonable to use the high life, in order to obtain results. 6 References 1 Jiang Zu contest. Copper mold. I Metallurgical Industry Press, Beijing box. L} I never 19a82 cabinet and so on. Dish is heat treatment. I Machine Press Beijing, Feng Xiao had a 903 and so on. Touch with copper and heat treatment. Beijing - Machine Building Industry Press. lg84 Taijin shop manual preparation group. Copper Handbook Volume III audio Ang. T Metallurgical Engineering Beijing chu Press base. 19a3 (Received t1991 a l2-30) (on the next page 35) is to increase the production costs and affect the normal continuous production of important factors. The failure of the second form of the first perforated Xinjiang mostly fatigue cracking. Perforation in the second head is the main subject of the tangential stress and torsional stress, so immediate addition to a high wear resistance and red hardness, but also have good toughness. Now we use the head is made of 3Cr2w8V steel, the average life expectancy has reached 200 ~ 800 / only, than the original 0.2 / L decreased to 0.15 / t. 2.2.4 Single cone surface quality of steel pass design can reduce the deformation zone in metal deformation of the axial additional stress, thus avoiding the second expanded or perforated enhance capillary surface defects, improve internal and external surface quality advantage. According to the actual production statistics, the single-cone system pass through the capillary outer fold lower than the previous rate of 20 to 80. 2.2.5 Tolerance second perforated single cone dimensional tolerances to maintain the size of the biconical roll pass level of accuracy, precision and stability in the wall thickness of ± 5%, diameter fluctuations in the ± 2 ~ 4. Results Wuzhou single-cone second piercing process to achieve a rolling process. A 11)

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