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How is the machinability of HRSA?

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minniewardrobe | Student, Undergraduate | eNotes Newbie

Posted June 25, 2009 at 10:54 PM via web

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How is the machinability of HRSA?

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giorgiana1976 | College Teacher | (Level 3) Valedictorian

Posted June 26, 2009 at 9:11 PM (Answer #1)

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Machinability of steel and stainless steel is better than HRSA, where, before heat treatment, cutting forces and the generated heat are much higher than steels.

In hard conditions, the work environment become unbearable, notch wear being a common and critical problem which only by programming techniques could be softened.

Ceramics are the answer for this problem, with recommended cutting speed of 200-300 m/min, but not always possible to be used.For example, if the shape doesn't allow ceramics, or other parameters such as surface quality, machine possibilities etc., then coated carbide with fine granulation, with recommended cutting speed of 40-60 m/min(roughing) or 60-100m/min (finishing), are the proper solution.

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krishna-agrawala | College Teacher | (Level 3) Valedictorian

Posted June 26, 2009 at 12:05 PM (Answer #2)

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HRSA is an acronym for heat resistant super alloys. These alloys become stronger at higher temperature, and are used for application where machine parts have to withstand high temperatures as well as high stresses.

Machining of of HRSA is difficult because the part gets heated during machining, increasing its strength. Therefor machining of HRSA requires special care including use of cutting tools made of special alloys. Also the machining speeds need to be lower to limit heat generation. Similarly machining cut depth, feed, and profile of the cutting tool must be adjusted to achieve optimum balance of heat generation and machining time.

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