10Lecture-ch41-WithSolution

10Lecture-ch41-WithSolution - ENGR3190U Manufacturing &...

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Lecture 10 (POST) Chapter 41 - Production Lines Introduction to production lines Analysis of manual production lines We will cover all sections in Chapter 41 1.0 Introduction Production Lines - important class of manufacturing system for large quantities of identical or similar products Total work is divided into small tasks, and workers or machines perform these tasks with great efficiency. Examples: Assembled products (e.g., automobiles and appliances) Mass produced machined parts (e.g., engine blocks and transmission housings) Production line: a series of workstations arranged so the product moves from one station to the next, and at each location a portion of the total work is performed Production rate of the line is determined by its slowest station: Called the bottleneck station Transfer of product along the line usually by a mechanical transfer device or conveyor system Some manual lines simply pass the product by hand between stations Production lines are associated with mass production Some lines are used for batch production Production lines can be designed to cope with variations in product models so long as product variety is “soft”. 1
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Three types of line can be distinguished: 1. Single model line - produces only one model and there is no model variation 2. Batch model line – produces more than one model, but in batches 3. Mixed model line - multiple models are intermixed rather than produced in batches Advantages mixed model line over batch model line: No downtime between models Avoids situations typical of batch production in which there are high inventories of some models while other models are stocked out Model mixes can be changed in response to changes in demand Problems with mixed model lines: Assigning tasks to workstations so that all workers have equal workloads is more complex Scheduling (determining the sequence of models) is a problem not encountered in single- model and batch-model lines Logistics (getting the right parts to each workstation for the model currently at that
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This note was uploaded on 12/09/2010 for the course MECH ENG mech301 taught by Professor Yang during the Spring '10 term at UOIT.

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10Lecture-ch41-WithSolution - ENGR3190U Manufacturing &...

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