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2003 Course Process Planning & Tool Selection

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Total No. of Questions : 12] P1050 [Total No. of Pages : 3 [3864]-180 B.E. (Production Engineering) PROCESS PLANNING AND TOOL SELECTION (2003 Course) (411089) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer 3 questions from Section-I and 3 questions from Section -II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. Q1) a) b) Q2) a) b) Q3) a) b) SECTION - I Explain the steps of process planning and list out the information required to do process planning. [8] Discuss the principles of DFM which are useful for designing a product. [8] OR Explain the following terms. [8] i) Part print, ii) Specification, iii) Routing, iv) Process picture. What functions are involved in the design and manufacture of a product and what do they contribute? [8] What are the three types of surface irregularities that can occur, describe each in brief? [8] What is meant geometry of form? Define the followings. [8] i) Concentricity, ii) Roundness, iii) Angularity, iv) Symmetry. P.T.O. 1 Q4) a) b) Q5) a) b) c) Q6) a) b) OR What is the purpose of grouping related surfaces or areas? Explain.[8] What key points should be considered in deciding the nature of work to be performed on the work-piece? [8] Define the following terms : i) Nominal size, ii) Basic size, iii) Allowance, iv) Tolerance. [4] Why are locators generally arranged in 3-2-1 pattern? [6] What is basic difference between tolerance stack and a limit stack? Explain with a suitable example. [8] OR What are the rules for locating long cylindrical and short cylindrical work-pieces? Explain with neat diagrams. [9] What is tolerance chart? What are the symbols used in tolerance chart? Why it is necessary to balance a tolerance chart. [9] SECTION - II Q7) a) Explain briefly the relationship between process selection and machine selection. [8] b) Distinguish between General Purpose Machine (GPM) and Special Purpose Machine (SPM). [8] OR What are various factors affecting the tool selection? Explain. [8] Q8) a) b) What are the various sources of information available to the process engineer in making a machine selection? [8] Q9) a) What is the role of expert system in generative Computer Aided Process Planning (CAPP) system? [8] b) What are the general guidelines for process selection? [8] OR What is an auxiliary operation? How can supporting operation be distinguished from auxiliary operation? [8] Q10)a) b) Explain Automatic Time Standard System (ATS) in CAPP. [3864]-180 2 -2- [8] Q11)Prepare a operation route sheet with proper operation sequence, time estimation, process parameters and process pictures, use of proper tooling and equipment for adapter ring (as shown in fig.1) using general purpose machine tools. The number of components to be produced is 1500. [18] Fig. No.1 OR Q12)Prepare a process sheet for a component as shown in figure 2. Which is to be manufactured in batches of size 600. Analyse the part print carefully and prepare the process sheet containing manufacturing plan with operation sequence, equipments, tooling, fixtures, process parameters and sample calculation of operation time. [18] Fig. No.2 Drg. notes : Material Tolerance Titanlum alloy : Surface finish : [3864]-180 3 General Hole 100 General Hole 100 0.1 0.05 0.05 3.2 m 0.4 m 0.1 m. rrr -3-

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