Общий каталог Widia 2017 - страница 683

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Technical Information General Machining Guidelines Radial Modified flank Alternating flank Reversed modified flank modified flank modified flank alternating flank modified flank 15º–29º 30' 15º–29º 30' angle of angle of angle of infeed infeed infeed Advantage — Advantage — Advantage — Advantage — • Cutting on both sides of the thread • Tool cuts both sides of thread form, • Increased tool life because both • Tool cuts both sides of thread form, form places all of the cutting edge so it is protected from chipping edges are used equally. so it is protected from chipping in the cut and protects edge from similar to 0° infeed. Channel-type similar to 0° infeed. Channel-type chipping. chip develops, but uneven chip chip develops, but uneven chip • Even wear on the insert. thickness helps remove the chip NOTE: Some machine tools may thickness helps remove the chip similar to flank infeed. require special programming similar to flank infeed. • This is the preferred method, techniques to achieve this • This is the preferred method, especially when used with a chip method of infeed. especially when used with a chip control insert. control insert. • Combined radial and/or alternating • Combined radial and/or alternating flank infeed. flank infeed. • Results in good tool life, with wear • Results in good tool life, with wear evenly distributed over both flanks. evenly distributed over both flanks. • As chip flow is the reversed feed direction, it is an excellent choice for internal threading. Disadvantage — Disadvantage — Disadvantage — Disadvantage — • Tool develops a channel chip that • Similar disadvantages as with 0° • Difficult to cut on conventional • Programming needs to be done may be difficult to handle. infeed, although reduced somewhat machinery. line by line. • Tip chipping occurs when cutting in magnitude as cutting forces are high-tensile materials. better equalised and chip flow is • Bur condition is increased. much less of a problem. • Entire cutting edge is engaged at finish of thread, causing increased tendency to chatter. widia.com F85