機械制造技術(shù)基礎(chǔ)課件-chapter3-section9-2012

1、ni ZZZZZ 21總 Rotating axis the workpiece Axis After machining Before machining 2021-6-282SCUT Ta Ta bab LLZ max (a) minLb b( L LbL(b minaL max aLL(a ) ) ) Zb bZbmin max a max min )LaLamin (b) ( ( La Lb max bL (LbbL bZ max a min Zb b ) ) 圖5-12 加工余量與工序公差的關(guān)系 Zb b b )()( 2 baaa a b tR T Z )( 2)( 22 baaa

2、b tRTZ () () baaaab ZTRt Return Return ii m i AA 1 0 min 1 1 1 max 1 1 max0 i n mi i m i AAA ii max 1 1 1 min 1 1 min i n mi i m i AAA ii 1 11 max n mi ix m i iss ABABAAAB 1 11 min n mi is m i ixx ABABAAAB )( 1 1 max 1 min 1 1 min 1 max minmax n mi i m i i n mi i m i iAAAAAA 1 1 1 11 n i i n mi i m

3、i i 1 11 n mi iM m i iM M AAA )()( 1 11 1 11 n mi i m i i n mi iM m i iM M AAAAAB 1 11 n mi iM m i iM ABAB 05. 0 15. 0 2021-6-28SCUT28 111 ,0 22 90 2 i 1 1 2 n i i 6;6 ii 6 1 ; 6 1 ii 1 1 2 n i i 1 1 1 n n n iM 1 1 22 n i iik A 1 11 n mi iM m i iMM AAAA 1 11 n mi iM m i iMM ABABAB A A A AA A B (a)(b

4、) B A A )(ABAAAA MM 2 22 ABAAA MM 1 11 ) 2 1 () 2 1 ( n mi iiiM m i iiiM AAA A A A AA A B (a)(b) B SBACR Ttttt P QBACR t Ttttt B q Shorten workplace preparation time： qShorten lead-wind time： 2021-6-2839SCUT Production costthe total cost to produce a part or a product Process costin production cost,

5、 the expenditure directly related with the process , it can be sub-divided into： Variable cost CV ：related with the year output and is proportional to the output ，including material CVM，the salary of workers CVP，machine run cost CVE，general machine depreciation CVD，cutting tool CVC，general fixture depreciation CVF Constant cost CN ：not directly related with the year output 。including the salary for workers involved in adjust work CSP，specialized machine deprecia