Estimation of cutting temperature in high speed machining

Article Abstract:

A method for estimating the ideal cutting temperature in high speed machining process is discussed. An infrared pyrometer equipped with fiber optic is used in this finite element method to monitor the tool surface temperature and the heat dissipated by the ceramic and carbide inserts near the cutting area. The average cutting edge temperature is then calculated by applying a differential equation of a single-dimension heat conduction problem. Results show that the thermal properties of the carbide and ceramic inserts affect the interface temperature and total heat through the cutting zone.

Usage, Temperature control, High-speed machining, High speed machining, Infrared technology, Pyrometers

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High temperature shape memory alloys

Article Abstract:

The advantages and disadvantages of existing systems of high temperature shape memory alloys (HTSMA) are presented. These are alloys having stable reverse transformation temperature over 120 degrees Celsius. Unfortunately, there is no actual large-scale application of these systems because of the following concerns: lower performance than NiTi alloys, stabilization of martensite, decomposition of martensite and brittleness owing to high elastic anisotropy or owing to brittle phases or precipitates.

Evaluation, Heat resistant materials, Shape-memory alloys, Shape memory alloys

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The mechanical behavior of zinc during machining

Article Abstract:

The mechanical behavior of zinc during machining was investigated. High- and low-speed machining tests were performed on a specimen to measure the apparent flow stresses during the cutting process. The measured values were then compared with those obtained during compression tests. Results show that the shear stress measured during machining is consistent with the shear stress measured during compression tests. This indicates that the width of the shear zone is related to its length.

Measurement, Zinc, Zinc (Metal), Shear (Mechanics), Machining

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