การปรับปรุงคุณภาพของหัวอ่านเขียนข้อมูลของฮาร์ดดิสก์ โดยประยุกต์ใช้การออกแบบการทดลอง / กฤษดา อัศวรุ่งแสงกุล = Quality improvement of the silder of a harddisk by applying a design of the experiment technique / Krisada Asawarungsaengkul
The objective of this research is to study the factors influencing on chips and cracks for cutting slider in the final cutting process and find some cutting for improvement this process. The first step begins with the consideration of the factors influencing on chips and cracks of slider. In addition, cause and effect diagram is used to present this idea From the diagram, five promising Factors was selected including spindle speed. Depth of cut, feed rate. Number of pass in dressing, and direction of cut. These factors are put in the screening experiments by using One-Half Fractional of 2k Factorial Design. The results is show that the significant factors effecting on chips and cracks are spindle speed and direction of cut Then data are analyzed to find a better cutting condition to reduce number of chips and cracks The cutting conditions are 8,500 rpm. for spindle speed and pole to taper for direction of cut. After that the further experiment is conducted to confirm the result. The results show that the number of chips and cracks is significantly reduced However the reduction in the number of chips and cracks is still not satisfactory. Thus, there may be another factors that probably effects to chips and cracks. This factor is frequency of inline-dressing. Which is limited to 3 levels of frequency with single factor experiment After conducting experiment. the result shows that the factor is statistically significant. Moreover, a better cutting condition is that frequency of pass of inline-dressing is in each cutting. Every cutting would reduce number of chips and cracks at the least. Then the confirmed experiment is conducted by statistical comparison The result is show that the number of chips and cracks in the better cutting condition is that frequency of pass of inline-dressing is in each cutting. Every cutting would reduce number of chips and cracks at the least. Then the confirmed experiment is conducted by statistical comparison The result is show that the number of chips and cracks in the better cutting condition is significantly reduced.
