約束理論---toc(編輯修改稿)
2025-02-12 16:43 本頁面
【文章內(nèi)容簡介】 opeThe slowest step / activity in the manufacturing chain sets the “Drum Beat” 在制造鏈中最慢的工序設(shè)置一個(gè)鼓點(diǎn) Capacity Constrained Resource (CCR) A B C D400 250 350 425Belton Confidential 15DrumBufferRopeA “buffer” is placed infront of the slowest step in the process to protect the constraint 一個(gè)緩沖器放在最慢的工序前來保護(hù)瓶頸A B C DBufferBelton Confidential 16What do Buffers do 緩沖器有什么用 ?? Provide a time based (buffer up periodically) reserve of material to protect the Constraint (and the entire process) from lost operating time due to variations in準(zhǔn)備一個(gè)以時(shí)間為基礎(chǔ)的物料儲(chǔ)備來防止瓶頸損失加工時(shí)間 ﹐ 這是由于變異來自 :? setup times 切換時(shí)間? processing times加工時(shí)間? machine breakdowns 機(jī)器故障? travel time 運(yùn)輸時(shí)間? delays 延期? normal process statistical fluctuations 正常工序統(tǒng)計(jì)波動(dòng)? Provide an opportunity to optimize constraint schedule 提供優(yōu)化瓶頸的機(jī)會(huì)– eg. ganging like products increases run length and increases constraint uptime and overall plant output 增加瓶頸的運(yùn)行時(shí)間 ﹐ 增加瓶頸的開機(jī)時(shí)間和總產(chǎn)出 .? Tie to the gating operation to control the release of raw material into the process stream 按照瓶頸工序的需求來發(fā)放原材料到生產(chǎn)線Belton Confidential 17Buffer Management 緩沖器管理3210Everything is OK(stop upstream production)Watch plan how you would expediteACT! we are in trouble!The profile of the buffer governs what type of expediting we are required to do (nothing, plan to expedite, expedite)Buffer size is a tradeoff between protection and lead time if buffer size is increased, protection increases, however so does manufacturing lead timeThe buffer can be properly sized by monitoring the “holes”“Holes” tell us where to make our next process improvement and where the constraint will move when the current constraint is elevatedBees the principle shop floor control mechanismBelton Confidential 18It is neither likely, nor desirable that all of the time buffer content profiles be 100 percent. On the other hand, the time buffer content profile must be sufficient to achieve the buffer’s primary purpose of protecting the constraint. Buffer Content Profile Based on % of Work Available 0102030405060
教學(xué)課件相關(guān)推薦
鄂ICP備17016276號(hào)-1