Tham khảo tài liệu 'process planning episode 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Material evaluation and process selection 155 Routing sheet Part name Part no. Drg. no. Quantity Matl Mild steel Planner . Hall Revision no. Date 16 08 01 Page 1 of 1 Order no. Op. no. Description Machine tool 10 20 30 40 50 60 70 80 Cast initial geometry Face to 0125 mm Face shoulder Bore 0100 mm Mill 40 mm wide slot Drill 10 mm diameter holes X 6 Deburr Inspect Figure Outline process plan for Example finished and the shoulder will be faced. The next step will be to mill the slot and mill the shoulder to a finish. Finally the holes will have to be drilled. As there are no heat tteatments specified or required and no finishing required the part requires no further processing. This outline process plan is illustrated in the partially completed route sheet in Fig. . General guidelines for operations sequencing The task of operations sequencing cannot be fully addressed until the particular machine has been selected which will be covered in Chapter 5. At this level the number of cuts to produce a certain feature would also be considered but again due to the influence of the equipment employed on the number of cuts required it cannot be covered in any great detail. However general guidelines for operations sequencing developed by Marefat and Britanik 1998 can be presented. These guidelines depend largely on the features required to be manufactured and the relationship between them. The relationships between features help to identify the accessibility of the features and therefore the order in which they must be produced. What is meant by accessibility is that some features may not be able to be produced to the required specification for example size surface finish etc. until a related 156 Process Planning feature is produced. In order to apply these feature-based guidelines all features must be categorized as either an external or internal feature External feature - has at least one of their opening faces on the boundary face of the component and
