Tham khảo tài liệu 'process planning episode 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | From design to manufacture 435 Table Summary of operations for all machines Machine Operation Investment casting line Produce wax pattern Flasking Bake Fill mould and cool Remove casting and finish NC lathe 2 Rough machine face leaving mm stock Finish machine face Drill press Spotface Drill holes Internal grinder Machine 0100 mm bore in four passes Machine 050 mm bore in four passes volume that is they are in effect parallel perpendicular and intersecting simultaneously. Using these definitions the 0100 mm bore will be machined first as it has the greatest area to be machined. Based on the fact that there is 2 mm machine allowance the two bores will be finished in four passes of equal depth that is four cuts of mm. The operations for each machine have been identified and sequenced according to the method presented in Chapter 4. These are summarized in Table . Tooling selection Evaluation of process and machine selection The processes to be used are investment casting turning drilling and grinding as detailed in Section . In terms of tooling the investment casting will not be considered further as the tooling in this instance will be the moulds that will be unique to the component. However the selection of tools for the other processes and operations will be considered further. Analysis of machining operations Turning The operation for turning can be clearly identified as facing. From this the specific tool can be identified Tuming facing tool - facing. Drilling There are two distinct operations to be carried out by the drilling process. These are the spotfacing and the drilling of the holes themselves. Again this 436 Process Planning allows two tools to be identified Spotfacing - 020 mm and 025 mm spot drills Drilling - 010 mm and 012 mm twist drills Grinding Although two operations are being carried out that is finishing both 050 mm and 0100 mm bores a single grinding tool can be used. In this case it is quite clearly .
