Usingthe correct process control technology,which canmakequalityimprove and cost reduce.25~40%10~25%the gap of 25%preventpreventtesttestcheckcheckbreakdownbreakdownBeforeusingsevenqualityAfter using seven qualitycontrolprinciplescontrolprincipleseliminatewasteQuality cost(calculating as a percentage of the2007.4production costs)6
Q 2007.4 uality cost(calculating as a percentage of the production costs) Before using seven quality control principles After using seven quality control principles breakdown test check prevent breakdown test check prevent 25~40% 10~25% the gap of 25% eliminate waste Using the correct process control technology, which can make quality improve and cost reduce. 6
Process control should befor the purpose of preventionratherthan simplyreworkafter finding outtheproblemThe control conditions are defined by InternationalQualityStandards:4,It amrrsinkraoueta de mrpsteha hstionrfiomfherinet focshefsuritd bttipnoiestapatimehedssa ndi product properties;, Phectse la ntHaspeaiadsegshiopud btempprbprai pterfoed ;production,,installation and seryice and we also shouldheimplementationwavsoftheprocessstandardSrala esapuatedaeanyconditions;ropriateworki.Strictlyfollowin'sstandardneal'segualiyplans-2?Eguipments.shouldtbensureandexpresslystipulatedprocedure:thatproductioncanrunsmoothly;2007.4Re-recognized process7
Re-recognized process 2007.4 Process control should be for the purpose of prevention rather than simply rework after finding out the problem. The control conditions are defined by International Quality Standards: 1、It must have a clear stipulation for the methods of production,installation and service; 2、The tools that we use should be appropriate for production, installation and service and we also should create appropriate working conditions; 3、Strictly following the standards,rules,quality plans and expressly stipulated procedure; 7 4、Carrying out a comprehensive monitoring for the suitable process parameters and product properties; 5、Process and special equipment must be approved; 6、The implementation ways of the process standard should be stipulated clearly; 7、Equipments should be maintained regularly to ensure that production can run smoothly;
On March 27,1977,two Boeing 747 aircraft collided on therunway at Canary Islands's airport, killing 583 people莎32Thesystem oflackingprevention2007.4andexaminationability8
The 2007.4 system of lacking prevention and examination ability 3 2 On March 27,1977,two Boeing 747 aircraft collided on the runway at Canary Islands's airport, killing 583 people. 8
leaded petrolunleaded petrolThree core power plugsPreventing the use ofhave only one positionleadedpetrolinato insert only three corevehicle designed forsocketunleaded petrol2007.4Based on the system of prevention9
2007.4 Based on the system of prevention Three core power plugs have only one position to insert only three core socket leaded petrol unleaded petrol Preventing the use of leaded petrol in a vehicle designed for unleaded petrol 9
Quality characteristic value can be described as ageneral form:x, =μ+r +dr ~ N(0,α)Type: x, stands for product quality characteristic valueat time t, ustands for the mean values of the distributionof quality characteristic value, r, stands for the noisecaused by random factors, d stands for the interferencecausedbyabnormal factorsx, ~ N(μu,α?)x ~ N(u+d,α)2007.4Control chart10
Control chart 2007.4 t t x r d = + + t x t r d Quality characteristic value can be described as a general form: 2 ~ (0, ) t r N 2 ~ ( , ) t x N 2 ~ ( , ) t x N d + Type: stands for product quality characteristic value at time t, stands for the mean values of the distribution of quality characteristic value, stands for the noise caused by random factors， stands for the interference caused by abnormal factors. 10