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首页> 外文期刊>International Journal of Production Research >Optimal Batch Quantity Models For A Lean Production System With In-cycle Rework And Scrap
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Optimal Batch Quantity Models For A Lean Production System With In-cycle Rework And Scrap

机译：具有周期返工和报废的精益生产系统的最佳批次数量模型

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摘要

In a manufacturing system, reworking of the defectives and management of waste or scrap are important issues that call for imrnediate attention to meet the basic objectives and requirements for lean production system. This paper deals with a manufacturing process where finished goods are occasionally produced along with undesirable defective items and scrap. As the system is not always perfect, some scrap is produced during the manufacturing and/or rework processes. A rework process is necessary to correct the defective items into good finished products. The manufacturing process considered in this research deals with the process of rework that is performed 'within' the cycle. Also, three types of scrap detection scenarios are considered: (ⅰ) detection 'before' rework, (ⅱ) detection 'during' rework, and (ⅲ) detection 'after' rework. In order to avoid shortage of finished products due to scrap production, finished-product buffers have been considered to fulfil the customers' timely demand. The required finished products for these buffers are ordered from different suppliers. Based on the observations in shop floors, a number of inventory models are developed for a single-stage production process wherein defective items are reworked, and scraps are detected and discarded during entire process. For the stated detection procedures, the total cost functions for a single-stage imperfect manufacturing system are developed with 100% inspection to find the optimum operational policy for manufacturing batch sizes and economic storage of inventories. Numerical examples are used to demonstrate these models, and an analysis is performed to study the sensitivity of different system parameters on several measures of performance.
机译：在制造系统中，缺陷的返工和废物或废料的管理是重要的问题，需要立即引起注意，以满足精益生产系统的基本目标和要求。本文涉及一种制造过程，在这种过程中，偶尔会产生成品以及不良品和废品。由于系统并不总是很完美，因此在制造和/或返工过程中会产生一些废料。必须进行返工过程才能将有缺陷的项目纠正为合格的产品。本研究中考虑的制造过程涉及在周期内执行的返工过程。此外，还考虑了三种类型的废品检测方案：（ⅰ）返工前的检测，（ⅱ）返工时的检测和（ⅲ）返工后的检测。为了避免由于废料产生而导致成品短缺，已考虑使用成品缓冲器来满足客户的及时需求。这些缓冲液所需的成品是从其他供应商处订购的。根据车间的观察结果，为单阶段生产过程开发了许多库存模型，其中对有缺陷的项目进行了返工，并在整个过程中检测并丢弃了废料。对于规定的检测程序，开发了具有100％检验的单阶段不完善制造系统的总成本函数，以找到制造批量大小和库存经济存储的最佳操作策略。数值示例用来说明这些模型，并进行分析以研究不同系统参数对几种性能指标的敏感性。

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