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Process Selection - From Design to Manufacture Episode 1 Part 3

Tham khảo tài liệu 'process selection - from design to manufacture episode 1 part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 24 Selecting candidate processes Production quantity per annum - The number of components to be produced to account for the economic feasibility of the manufacturing process. The quantities specified for selection purposes are in the ranges Very low volume 1-100 Low volume 100-1000 Medium volume 1000-10000 Medium to high volume 10000-100000 High volume 100 000 All quantities. Due to page size constraints and the number of processes involved each manufacturing process has been assigned an identification code rather than using process names as shown at the bottom of Figure 2.2. There may be just one or a dozen processes at each node in the selection matrix representing the possible candidates for final selection. As seen in Figure 1.11 there are many cost drivers in manufacturing process selection not least component size geometry tolerances surface finish capital equipment and labor costs. The justification for basing the matrix on material and production quantity is that it combines technological and economic issues of prime importance. Many manufacturing processes are only viable for low-volume production due to the time and labor involved. On the other hand some processes require expensive equipment and are therefore unsuitable for low production volumes. By considering production quantities in the early stages the process that will prove to be the most economical later in the development process can be identified and selected. The boundaries of economic production however can be vague when so many factors are relevant therefore the matrix concentrates rather more on the use of materials. By limiting itself in this way the matrix cannot be regarded as comprehensive and should not be taken as such. It represents the main common industrial practice but there will always be exceptions at this level of detail. It is not intended to represent a process selection methodology in itself. It is essentially a first-level filter. The matrix is aimed at focusing attention on