遼字石油化工大學⊙ BThe Function of process planning sheet The function of the process planning sheet is as follows 1. The main technique for giving regulations to guide the production 2 The basis of orgnization and management 3. The main information to guide the building, enlarging or rebuilding of a mechanical factory
B.The Function of process planning sheet The function of the process planning sheet is as follows: 1. The main technique for giving regulations to guide the production 2. The basis of orgnization and management 3. The main information to guide the building, enlarging or rebuilding of a mechanical factory
遼字石油化工大學⊙ C Design procedures of process planning The function, importance and working condition of the part should be clarified 2. Determination of production type according to production expectation The expected number of parts can be calculated according to the following formula Np=N情n’(1+)(1+6 Where: Np--the expected number of parts in one year; N----the expected number of products in one year n---the number of parts in one product; a----percent of spare parts; B----percent of scrap parts
C.Design procedures of process planning 1. The function, importance and working condition of the part should be clarified. 2. Determination of production type according to production expectation. The expected number of parts can be calculated according to the following formula: Np=N*n*(1+α)*(1+β) Where: Np---the expected number of parts in one year; N-----the expected number of products in one year; n-----the number of parts in one product; α-----percent of spare parts; β-----percent of scrap parts;
遼字石油化工大學⊙ Table 6-5 can be used as a reference to guide the classification of production type babe 65, eare pitl e d ethecleicaiopodrtontpe. output number in one year large and heavy medium size light sing below 5 below 10 below 100 sma|5-10 10-200 100-500 batch/mediu l 100-300200500 500-5000 m age300100050050005001500 large quantity beyond 1000 beyond 5000 beyond 50000 To calssify the production type, both the expected number and the volume, weight of the part should be taken into account
Table 6-5 can be used as a reference to guide the classification of production type . To calssify the production type, both the expected number and the volume, weight of the part should be taken into account
遼字石油化工大學⊙ 3. Determination of raw material type The determination of raw material is related with the part geometrical shape, dimensions, mechanical performance of material and produciton type, current production conditions of the workshop The main type of raw material including: Casting, Forging, Profiled bar and Welding etc In large batch or large quantity production, highly precise and efficient manufacturing methods for raw material are often used In single or small batch production, sand casting with wooden mould or free deformed forging are often used
3. Determination of raw material type The determination of raw material is related with the part geometrical shape, dimensions, mechanical performance of material and produciton type, current production conditions of the workshop. The main type of raw material including: Casting, Forging, Profiled bar and Welding.etc. In large batch or large quantity production, highly precise and efficient manufacturing methods for raw material are often used. In single or small batch production, sand casting with wooden mould or free deformed forging are often used
遼字石油化工大學⊙ 4. Process route planning It includes selection of mounting surface and machining method classification of process phases, sequencing the operations, determining the degre of operation distribution, arrangement of hot working or inspection and other auxiliary operations 5. Selection of machine tools, technical equipment including cutting tools, fixtures and inspection tools)and auxiliary tools for each operation 6. Selection of metal removal, operation dimensions and tolerances for each operation 7. Selection of metal cutting parameters and standard operation times 8. Technical economical analysis
4. Process route planning It includes selection of mounting surface and machining method, classification of process phases, sequencing the operations, determining the degre of operation distribution, arrangement of hot working or inspection and other auxiliary operations. 5. Selection of machine tools, technical equipment ( including cutting tools, fixtures and inspection tools ) and auxiliary tools for each operation. 6. Selection of metal removal, operation dimensions and tolerances for each operation 7. Selection of metal cutting parameters and standard operation times 8. Technical economical analysis