Process yield improvement on the gram load adjusting process of a suspension manufacturer

Asawarungsaengkul, Krisada; Sukamta, S.

doi:10.1109/icqr.2011.6031733

Cited by 3 publications

(5 citation statements)

References 6 publications

(8 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To screen factors, a one half-fraction 2 6-1 design that gives the resolution VI is applied. The resolution VI of this design is enough to provide us the information about main effects and interactions [5,6]. This single replicate 2 6-1 design and 1 center point requires the total of 33 observations.…”

Section: Experimental Designs and Resultsmentioning

confidence: 99%

“…In an electronic industry, an experimental design has been wildly used. Asawarungsaengkul et al [1] applied a full factorial design to determine factors that significantly affect incomplete welding problem at a laser spot welding process. With a new process setting, the defective rate was reduced from 0.5472% or 5,472 DPPM to 0.1775% or 1,775 DPPM.…”

Section: Introductionmentioning

confidence: 99%

“…The result showed that defective rate of undercut defect was reduced from 0.5% to 0.32%. Asawarungsaengkul [5] applied a one half factorial design to improve process yield at a gram load adjusting process of a suspension manufacturer. With a new process setting, the process yield increased from 98.59% to 99.14%.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Determination of Bore Grinding Machine Parameters to Reduce Cycle Time

Buddhachakara

Tharmmaphornphilas

2014

AMR

View full text Add to dashboard Cite

This paper applies a central composite design (CCD) to determine proper machine parameters to reduce the cycle time of a bore grinding process. There are 6 machine parameters, which are rough grinding 2 starting position, fine grinding starting position, speed of rough grinding 1, speed of rough grinding 2, speed of rough grinding 3 and speed of fine grinding and 2 types of responses, which are cycle time and surface roughness considered in this study. A half CCD is used to find the optimal machine setup parameters. The experiment shows that new machine conditions can reduce cycle time from 2.98 second per piece to 2.76 second per piece and control surface roughness within specification of 1.0 um. After implementing the new machine conditions in the real setting, we found that the average actual cycle time is 2.76 second per piece with roughness of 0.841 um.

show abstract

Section: Experimental Designs and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Determination of Bore Grinding Machine Parameters to Reduce Cycle Time

Buddhachakara

Tharmmaphornphilas

2014

AMR

View full text Add to dashboard Cite

show abstract

“…There are various applications of cost reduction through quality improvement in electronics as shown by failure analysis of ultrasonic pitting and carbon voids on magnetic recording disks [1] aimed to reduce carbon voids and ultrasonic power for improve disks quality, defect reduction of patterned media templates and disks [2] with respect to inspection methodology of hard disk pattern using jet and flash imprint lithography and characteristic and reduction of a new particle defect mode in sub-0.25 µm semiconductor process flow [3]. Six Sigma has been wildly and increasingly accepted in electronics and computer industries as a tool for the cost reduction through process improvement [4,5,6,7] due to its systematic procedures based on the statistical analysis [8].…”

Section: Introductionmentioning

confidence: 99%

Spiral Defect Reduction of Hard Disk Drive Media

Pongtrairat

Senjuntichai

2013

AMM

View full text Add to dashboard Cite

The objective of this study is to reduce a number of defects in Hard Disk Drive (HDD) manufacturing due to spiral scratch on media by applying DMAIC steps of Six Sigma approach. The spiral scratch is firstly identified as the significant loss with 6.03% defective rate. Secondly, the paddle to disk space, top cover edge sharpness, pitch static attribute and number of load/unload cycle are found to be the key process input variables (KPIV). The experiment based on four KPIVs is then designed following Box Behnken design. With the results from the experiment, the response surface method is applied to determine the optimal setting for these four KPIVs with respect to the minimum percentage of the spiral scratch. Finally, the process with the optimal settings of the paddle to disk space at 3 mm, top cover edge sharpness at 0.002 inch, pitch static attitude at 0.01 inch and number of load/unload cycle at 10,000 times is implemented and monitored by the p control chart. After the improvement, the defective rate of the spiral scratch is decreased by 48.8% from 6.03% to 3.09%.

show abstract

“…The Six sigma approach has been wildly and increasingly accepted as a tool for process or efficiency improvement [1] due to its systematic procedures based on the statistical analysis. According to electronics and computer industries, there are various process improvements under Six sigma approach [2,3,4,5]. With the preliminary survey, the number of defectives of the studying HDD company is very high and a few process are not efficient.…”

Section: Introductionmentioning

confidence: 99%

Bit Error Rate Improvement of Hard Disk Drive

Dumrongvanich

Senjuntichai

2013

AMR

View full text Add to dashboard Cite

The objective of this research is to improve the performance of the read-write head process in Hard disk drive manufacturing with respect to Bit Error Rate (BER). With the preliminary survey, the process capability index (Cpk) of BER was 0.72 which is less than the one side acceptable value at 1.25. To improve Cpk of BER, five phases of Six sigma approach are applied starting from define, measure, analyze, improvement and control phases. At 95% confidence, thermal protrusion, writing current amplitude, writing current overshoot, number of defects on media and writing head width are the significant factors for Bit Error Rate due to their p-value less than 0.05. Since the number of defects and writing head width are uncontrollable factors, the experiment are designed and performed based of general factorial design with three levels of each controllable factor. At 5% significance level, there are the interaction effects between the thermal protrusion and the writing current amplitude as well as the interaction affects between the writing current amplitude and the writing current overshoot. With the general linear model (GLM), the suggested values for the thermal protrusion, writing current amplitude and writing current overshoot are 35 DAC, 10 mA and 9 mA, respectively. Under the suggested condition, Cpk of BER is increased from 0.72 to 2.38 and the percentage of defective due to head related failure is reduced from 21.85% to 9.86%.

show abstract

Process yield improvement on the gram load adjusting process of a suspension manufacturer

Cited by 3 publications

References 6 publications

Determination of Bore Grinding Machine Parameters to Reduce Cycle Time

Determination of Bore Grinding Machine Parameters to Reduce Cycle Time

Spiral Defect Reduction of Hard Disk Drive Media

Bit Error Rate Improvement of Hard Disk Drive

Contact Info

Product

Resources

About