1、1/41,第十六章,剛好及時(shí)化系統(tǒng) Just-In-Time,天馬行空官方博客： ；QQ:1318241189；QQ群：175569632,2/41,章節(jié)概要,導(dǎo)論 JIT的目標(biāo) 建立JIT架構(gòu) 轉(zhuǎn)換到JIT系統(tǒng) 服務(wù)業(yè)的JIT JIT採(cǎi)購(gòu) JIT II 作業(yè)策略,只有在需要的時(shí)候才生產(chǎn) 存貨會(huì)明顯減少 一般是小批量生產(chǎn) 是一種精簡(jiǎn)生產(chǎn)系統(tǒng)lean production system,3/41,1.導(dǎo)論,剛好及時(shí)化系統(tǒng):重複性的生產(chǎn)系統(tǒng),其物料與貨品的加工 dealing with breakdowns or problems when they occur Preventive mainte

2、nance Proactive approach; reducing breakdowns through a program of lubrication, adjustment, cleaning, inspection, and replacement of worn parts,34/41,Reasons for keeping equipment running Avoid production disruptions Not add to production costs Maintain high quality Avoid missed delivery dates,Maint

3、enance Reasons,35/41,Production capacity is reduced Orders are delayed No production Overhead continues Cost per unit increases Quality issues Product may be damaged Safety issues Injury to employees Injury to customers,Breakdown Consequences,36/41,Total Maintenance Cost,Breakdown andrepair cost,Opt

4、imum Amount of preventive maintenance,COST,Total Cost,Preventivemaintenance cost,Table 16S-1,37/41,Preventive maintenance: goal is to reduce the incidence of breakdowns or failures in the plant or equipment to avoid the associated costs Preventive maintenance is periodic Result of planned inspection

5、s According to calendar After predetermined number of hours,Preventive Maintenance,38/41,Frequency of breakdown / month If the average cost of a breakdown is $1,000, and the cost of preventative maintenance is $1,250 per month, should use preventive maintenance?,Example S-1,39/41,Expected cost to re

6、pair = 1.4 breakdowns per month X $1000 = $1400 Preventive maintenance (PM) = $1250 PM results in savings of $150 per month,Example S-1 Solution,40/41,Maintenance interval,Average time before breakdown is normal distribution with mean 3 weeks and standard deviation 0.6 week. If breakdown cost average $1000 and preventive maintenance cost $250 ANS: 250/(250+1000)=0.2 usin