6英文资料 GY5 35X60(J1型、半)联轴器加工工艺与工装设计.docVIP

外文资料 Herbert W. Yankee Manufacturing Processes [M] Prentice-Hall Inc., 1979 Medium-Production Lathes Duplicating Lathe: Duplicating (or tracer) lathes are designed to produce duplicate parts by semiautomatic means. Except f tape-controlled lathes (discussed in Chapter 21), the operator is required to load and unload the work pieces and to start the automatic operation for each cutting cycle. One single-point cutting tool is used. Straight, tapered, and contoured turned or faced surfaces and bored holes are repetitively produced by the motion of a stylus as it follows the outline of a low-cost template. The template is generally mounted at the rear of the machine. The movements of the stylus are actuated by mechanical, air, hydraulic, or electrical methods. Work may be held between centers or chucked. Duplicating or tracer attachments are generally factory-installed on a standard engine lathe, although special machines are also available. Turret Lathe: Turret lathes are semiautomatic machine tools which can produce parts in greater quantities, to closer tolerances, faster, and as a result more economically than is possible by conventional engine lathes. Unlike the engine lathe, the turret lathe is not restricted to a single cutting tool. A leading advantage is that several operations may be performed on a work pace at a given time. It should be noted, however, that the range and types of turret lathe operations are essentially the same as those associated with the engine lathe. FIGURE 16-6 Turret lathe production part (Courtesy, Jones Lamson) Figure 16-6 illustrates examples of turret lathe production parts. To offset the need for frequent tool changes, a six-sided turret is used in place of a tailstock. The turret may easily be indexed so that any desired cutting tool may contact the work piece. Additional cutting tools may be placed in square turrets on the cross slide and may be readily indexed to machine other surfaces. Unlike a cutting tool used