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2 International Journal of Applied Mechanics and Engineering

2 2004

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Comparative performance analysis and modeling of tool wear in drilling

Wen C. C., Soon L. T., Sivarao

International Journal of Applied Mechanics and Engineering

2004

Vol. 9, no spec.

33-38

To date, process supervision or monitoring is mainly performed by limit value checking of some measurable variables. In high automated machine tool faults like tool breakage often cause long outage times and high cost. Drill holes are one of the most common manufacturing features specified on process plans. Because holes are drilled in finished products, the rejection parts due to poor hole quality can be very expensive. It was estimated that 60% of all parts rejections due to poor hole quality. On the other hand, a work piece must often be re-machined or completely rejected when the tool has failed. The investigation of this paper deals with comparative quality and performance of twist drills of different make possessing same geometry. The paired comparison is to be carried out by considering thrust force and torque as the main criteria to determine the better tool among tool X and tool Y. Analytical methods namely, statistical analysis and inverse coefficient matrix analysis were used to validate the experimental result.

Comparative analysis and modeling of surface roughness in drilling

Wen C. C., Soon L. T., Sivarao

International Journal of Applied Mechanics and Engineering

2004

Vol. 9, no spec.

305-311

Drilling is one of the basic, most frequently performed materials removing process in manufacturing industry. In spite of significant increase in the demand for economically producing holes, drill manufacturing is still considered as an esoteric art. The drilling operation is frequently used as a preliminary step for many operations like boring, reaming and tapping. Surface roughness plays an important role in product quality and manufacturing process planning. Twist drills are used in a diameter range from 1 to 20mm. Surface finish quality of work piece is an issue of main concern to the manufacturing industry and the inspection of surface roughness of the work piece is a very important technology. Drill wear has a bad effect on the surface finish and dimensional accuracy of the work piece. There still exists a lack of knowledge on the exact relationship between the point geometry, the grinding process parameters and the process machines, resulting in many methods for drill production and consequently wide variation in process performance. The variables selected for modeling of surface roughness are cutting speed, cutting feed, machining time and thrust force. The relative comparison of drilled surface produced by twist drills by different make (tool X and tool Y) is to be carried out by actual measurement, statistical analysis and inverse coefficient matrix method.