tailieunhanh - Six Sigma Projects and Personal Experiences Part 9

Tham khảo tài liệu 'six sigma projects and personal experiences part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Successful Projects from the Application of Six Sigma Methodology 111 Measure The record sheet is a simple graphical method for collection of the occurrences of events. Each mark represents an occurrence and the operator can quickly tabulate the count of the occurrences. Table 14 shows the record sheet for the defects of the binder. Defect Count Subtotal Feeder x x x x x x x x x x x x x x x 14 Maintenance x x 2 Vinyl Problem x 1 RF Problem x 1 Load and unload problem x x x x x x x x 8 Total 26 Table 13. Record Sheet for the location of problem appearance The Pareto Chart helps focus the most important causes Figure 20 shows the main flaws in the area of folders and the damage The most common defect is the damage in the BC holder that is the major contributor with 60 of the problems of the BC. Fig. 20. Pareto Chart for the Type of Damage Analysis To illustrate where the damage occurs see Figure 21 that shows an overview of the Hang machine as the station is loaded with subassemblies that will rivet the ring the operator decides what amount to place station load and the movement of the conveyor. Rotary Table 4 R4 machine is similar to the rotaries 5 6 except that here the BC is sealed to the bag. The R4 makes a good seal with the appropriate parameters but it has the disadvantage of producing an average 20 pieces of scrap per shift. This is where our problem lies because if the surplus is not cut or partially cut. This can damage other subsequent subassemblies in the riveting process. A Cause and Effect diagram shows the supposed relationship between a problem and their potential causes. Figure 22 shows the possible causes of variation in the cutting of vinyl for BC the machine where it is cut like a giant guillotine caused flash after the sealing operation around the vinyl bag. 112 Six Sigma Projects and Personal Experiences Fig. 21. Hang Machine where the Loadingand Unloading problem Ocurrs Fig. 22. Cause and Effect Diagram for the Assembly Binder Process .