tailieunhanh - Thread Technologies by JS.Noho_2

Tham khảo tài liệu 'thread technologies by ', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Threading Technologies 191 associated mass effect 9 10 meant that the dies could be through-hardened - which gave them an overall bulk hardness of greater than HSS. Today basically dies are either manufactured from micro-grained HSS or coated cemented carbide. Solid dies Fig. 99a do not have any means to compensate for die wear whereas their split-die nut counterparts Fig. 99b-left can be manually-adjusted. This adjustment of the die is achieved by turning a centrally mounted grub-screw in the stock body which along with the fixing screws can be made to open or close on the shaft to be threaded. In this manner achieving the correct thread tolerance or play for the desired fitment of its associated mating nut. It is also usual practice to use a suitable die lubricant to facilitate in the thread s production while improving surface finish and prolonging the die s life - as excessive friction occurs during this type of threading process. The major disadvantage of using the solid-type threading dies is that they either have to be unscrewed from the threaded workpiece or rewound from the thread using up unproductive time elements this being particularly important for large batch runs or in a continuous production environment. Self-opening dies1 . not depicted have been utilised for many years on capstan and turret lathes single- and multi-spindle automatics and so on for cutting external threads. Several types of self-opening die heads are available ranging from radial tangential or circular arrangement of the multi-point cutting inserts and thread chasers. In most cases it is usual for the 9 Mass effect is related to the component s rulingsection. For example if the part has a large cross-sectional area when it is quenched from the hardening temperature zone . this can be found from its associated thermal equilibrium diagram -for the present it will not exceed the critical cooling velocity and only a partial martensitic state occurs. This is because the quench .

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