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The study of high speed fine turning of austenitic stainless steel

Lin W. S.

Journal of Achievements in Materials and Manufacturing Engineering

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2008

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Vol. 27, nr 2

191-194

EN

Purpose: The purpose of this research paper is focused on the surface roughness variation in high speed fine turning of the austenitic stainless steel. Design/methodology/approach: A series of experimental tests have been done to evaluate the possibility of high speed fine turning of the austenitic stainless steel from the surface roughness variation and machining stability. Findings: It was found that, the smaller the feed rate, the smaller the surface roughness value. But when the feed rate smaller than the critical feed rate, the chatter will occurs and the surface roughness of the work piece would be deteriorated. The higher the cutting speed is, the higher the cutting temperature of cutting tool is. The cutting tool will be soften and the surface roughness of the workpiece will be deteriorated. Research limitations/implications: The tool chattering would caused poor surface roughness in high speed fine turning for feed rate smaller than 0.02 mm/rev. The chatter suppression method must be considered when high speed fine turning of austenitic stainless steel. Originality/value: Most of the stainless steel machining proceeds at low cutting speed because the austenitic stainless steel is a hard machining material. The research result of this paper indicated that high speed fine turning of austenitic stainless steel is possible.

2

The optimal clearance design of micro-punching die

Lin J. C., Lin W. S., Lee K. S., Tong J. L.

Journal of Achievements in Materials and Manufacturing Engineering

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2008

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Vol. 29, nr 1

79-82

EN

Purpose: The purpose of this research paper is focused on the optimal clearance design of micro-punching die by abductive network and SA method. Design/methodology/approach: The punching data (input) and wear size (output) were collected for a training database. In order to select proper clearance to evaluate the wear of die, the abductive network was used to establish an efficient relationship between input parameters and output result. This can help to predict wear size under any degree of clearance and hence to replace worn punches and dies at the right time. A simulated annealing (SA) optimization algorithm with a performance index is then applied to the neural network for searching the optimal clearance parameters, and obtains rather satisfactory result as compared with the corresponding experiment verification. Findings: This study aims to identify the relationship between clearance and service life of micro punches using the Neural Network, and to find relational data involving the service life of punches and punching parameters in non-metal blanking processes. The result can be used to estimate optimal clearance between punch and die for industrial applications. Research limitations/implications: In this study, the practical punching processes with different punching conditions were carried out for a set of training data. A trained model exhibited a relationship between service life and clearance of micro punch and die through an abductive network system. The predicted value of wear by abductive network is very close to the actual experimental value, with an error of less than 8%. This result satisfies the required standard for IC factory production. Originality/value: A good clearance design not only increases the quality of product manufactured, but also reduces product's burr. As a result, the wear of punches and dies can be greatly reduced and the life expectancy of punching dies increased.

3

Study on the design of table mechanism with multi-degree of freedom

Hsieh C. F., Lin W. S., Hsu Y. C.

Archives of Materials Science

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2008

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Vol. 29, nr 3

131-140

EN

Purpose: Thus, this paper will bring up a new design for computer desk with multi-degree of freedom. Design/methodology/approach: Computers play a major role in our everyday life. The high utility rate and long using period of computer make the design of computer desk important. So far, the most popular computer desk is a non-flexible structure, which has less spare space. Findings: This new type mechanism design has six links and five joints, where includes four rotation pairs and one sliding pairs. The height and the position of the desktop are adjustable. This design can be also applied to operation tables or beauty salon chairs. Practical implications: To design an adjustable table is hopping to create ideal circumstances in our daily life. This paper mainly focuses on the design that can satisfy most people’s needs. Originality/value: The newly developed table can lower the physical harm after a long time use, and can increase the comfortableness in its adjustable function.