机器停着也能赚钱
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我们再看看丰田公司是怎样避免和杜绝库存浪费的。许多企业的管理人员都认为,库存比以前减少一半左右就无法再减了,但丰田公司就是要将库存率降为零。为了达到这一目的,丰田公司采用了一种“防范体系”。为了建立这种防范体系,丰田公司在细节处真正做足了功夫。
就以作业的再分配来说,几个人为一组干活,一定会存在有人“等活”之类的窝工现象存在。所以,有人就认为,对作业进行再分配,减少人员以杜绝浪费并不难。
但实际情况并非完全如此,多数浪费是隐藏着的,尤其是丰田人称之为“最凶恶敌人”的生产过量的浪费。丰田人意识到,在推进提高效率缩短工时以及降低库存的活动中,关键在于设法消灭这种过量生产的浪费。
为了消除这种浪费,丰田公司采取了很多措施。拿自动化设备来说,该工序的“标准手头存活量”规定是5件,如果现在手头只剩3件,那么,前一道工序便自动开始加工,加到5件为止。到了规定的5件,前一道工序便依次停止生产,制止超出需求量的加工。再拿后一道工序来说,后一道工序的标准手头存活量是4件,如减少1件,前一道工序便开始加工,送到后一道工序。后一道工序一旦达到规定的数量,前一工序便停止加工。
像这样,为了使各道工序经常保持标准手头存活量,各道工序在联动状态下开动设备。这种体系就叫做“防范体系”。
在必要的时刻,一件一件地生产所需要的东西,就可以避免生产过量的浪费。但是,这时必须知道“必要的时刻”是什么时候。于是,“单位时间”的意义就很重要了。
“单位时间”是制造一件产品所需要的时间,只能从产品的需求量类推出来。“单位时间”是用“一天的需求件数”,除以“一天的可动时间”求出的。“可动时间”是一天内机器可以开动的时间。
在丰田生产方式中,“开动率”和“可动率”是严格区分的。所谓开动率就是,在一天的规定作业时间内(假设为8小时),有几小时使用机器制造产品的比率。假设有台机器只使用4小时,那么这台机器的开动率就是50%。开动率这个名词是表示为了干活而转动的意思,倘若机器单是处于转动状态即空转,即使整天开动,开动率也是零。丰田公司不用“运转率”,而全部使用“开动率”这个词。
“可动率”是指在想要开动机器和设备时,机器能按时正常转动的比率。最理想的可动率是保持在100%。为此,必须按期进行保养维修,事先排除故障。
拿私家车来说,可动率是用百分比表示的、自己的汽车想什么时候开都能顺利开动的状态。开动率则是一天内有几小时开动了自己汽车的比率。谁都是在需要的时候才坐汽车,所以,100%的开动率并不是理想的。如果没有事整天开汽车闲逛,就是浪费汽油,汽车出故障的可能性也会增多,这是不合算的。
由于汽车的产量因每月销售情况不同而有所变动,开动率当然也会随之而发生变化。如果销售情况不佳,开动率就下降;反之,如果订货很多,就要长时间加班或倒班,有时开动率为100%,有时甚至会达120%或130%。因此,不能把开动率的百分比作为一个工厂的目标。
参观丰田工厂的人可以看到,它和其他工厂一样,机器一行一行地排列着。但有的在运转,有的都没有启动,很显眼。于是有的参观者疑惑不解:“丰田公司让机器这样停着也赚钱?”
不错,机器停着也能赚钱!这是由于丰田汽车公司创造了这样的工作方法:必须做的工作要在必要的时间去做,以避免生产过量的浪费,以避免库存的浪费。
这就是丰田公司的精细!如果不是在每一个细节上都精益求精,完全不可能达到这种效果。请大家想一想,对于一个年产量340多万辆(这还是经济不景气时而压缩的产量)日产9000多辆汽车的大公司来说,里面又凝结了多少琐细、艰苦的劳动!
上帝与细节同在,同等级企业的竞争在细节。
[记住网址龙腾小说ltxsba.com]
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