statistical process control injection molding

... Hybrid Neural Fuzzy System for Statistical Process Control 18.1 Statistical Process Control 18.2 Neural Network Control Charts 18.3 A Hybrid Neural Fuzzy Control Chart 18.4 Design, Operations, ... cause three is present; process is out-of -control Assignable cause two is present; process is out-of -control Assignable cause one is present; process is out-of -control Only chance causes ... are provided to assist those who seek an automatic SPC strategy. 18.1 Statistical Process Control Statistical process control (SPC) is one of the most often applied quality improvement tools...

Ngày tải lên: 23/01/2014, 01:20

... Designing the statistical process control system 334 Objectives 334 13.1 SPC and the management system 334 13.2 Teamwork and process control/ improvement 338 13.3 Improvements in the process 340 13.4 ... LONDON NEW YORK PARIS SAN DIEGO SAN FRANCISCO SINGAPORE SYDNEY TOKYO Statistical Process Control Quality, processes and control 5 The problems are often a symptom of the real, underlying cause ... define the process. For example, if the process is making a sales call, it is vital to know if the scope of the process includes obtaining access to the 16 Quality, processes and control satisfy...

Ngày tải lên: 05/03/2014, 17:20

... Quality, processes and control Objectives ᭹ To introduce the subject of statistical process control (SPC) by considering the basic concepts. ᭹ To define terms such as quality, process and control. ᭹ ... since I wrote the first edition of Statistical Process Control – a practical guide in the mid-eighties. Then people were rediscovering statistical methods of ‘quality control and the book responded ... communications improve. Statistical process control (SPC) methods, backed by management commitment and good organization, provide objective means of controlling quality in any transformation process, whether...

Ngày tải lên: 27/06/2014, 06:20

... since I wrote the first edition of Statistical Process Control – a practical guide in the mid-eighties. Then people were rediscovering statistical methods of ‘quality control and the book responded ... Understanding the process 23 Objectives 23 2.1 Improving customer satisfaction through process management 23 2.2 Information about the process 26 2.3 Process mapping and flowcharting 29 2.4 Process analysis ... flowcharting 29 2.4 Process analysis 35 2.5 Statistical process control and process understanding 37 Chapter highlights 40 References 41 Discussion questions 41 3 Process data collection and presentation...

Ngày tải lên: 27/06/2014, 17:20

... Inputs to Figure 1.1 A process 34 Understanding the process Figure 2.8 ‘Classic’ flowchart for part of a contact lens conversion process Quality, processes and control 7 processes include: equipment, ... Understanding the process 23 Objectives 23 2.1 Improving customer satisfaction through process management 23 2.2 Information about the process 26 2.3 Process mapping and flowcharting 29 2.4 Process analysis ... flowcharting 29 2.4 Process analysis 35 2.5 Statistical process control and process understanding 37 Chapter highlights 40 References 41 Discussion questions 41 3 Process data collection and presentation...

Ngày tải lên: 27/06/2014, 18:20

... the inputs and outputs of the processes, and in terms of the customers of and suppliers. 2.5 Statistical process control and process understanding Statistical process control (SPC) has played a ... Acquisition of raw materials process map Understanding the process 31 process, including some of the important outputs and some of the problems that could occur at each stage. The process map or block ... and critical processes. ᭹ Creation of ‘dynamic models’ through mapping out the critical processes will engage the people in an enduring change process. ᭹ A systematic approach to process understanding...

Ngày tải lên: 11/08/2014, 20:22

... common causes of variation are present, the process is said to be stable or ‘in statistical control . Special causes lead to an unstable or ‘out of statistical control process. ᭹ Following an understanding ... operation, where the process is carried out, and by the operators of that process. Results are plotted on a chart which reflects the variation in the process. As shown in Figure 4.3 the control chart ... its management 79 The purpose of a control chart is to detect change in the performance of a process. A control chart illustrates the dynamic performance of the process, whereas a histogram gives...

Ngày tải lên: 11/08/2014, 20:22

... mean of the process and take suitable corrective action. Is the process in control? The operation of control charts for sample mean and range to detect the state of control of a process proceeds ... state of statistical control (Figure 6.9). A comparison of process capability and tolerance can only take place, with confidence, when it has been established that the process is in control statistically. Capability ... processes are not in control when first examined using control chart methods and the special causes of the out of control periods must be found and corrected. Figure 6.9 Process capability Process...

Ngày tải lên: 11/08/2014, 20:22

... together to control the process. ᭹ A set of detailed rules is required to assess the stability of a process and to establish the state of statistical control. The capability of the process can be ... whether a process is in a state of statistical control. Several control chart techniques exist which make use of other measures. Use of control charts As we have seen in earlier chapters, control ... whether the process will generate products or services which match the specified requirements. 3 Process Control Using Charts (Do we continue to be in control? ). The X and R charts carry ‘control...

Ngày tải lên: 11/08/2014, 20:22

... use of control charts for range and standard deviation, explaining their differences and merits. (b) Using process capability studies, processes may be classified as being in statistical control ... 0.14 24 0.26 Other types of control charts for variables 181 them may be used to control the dispersion of the process, together with the mean chart to control process average. If the standard ... 11.6 9.5 Other types of control charts for variables 185 as continuous processes – only the time scales differ. Control charts are used to investigate the variability of processes, help find the...

Ngày tải lên: 11/08/2014, 20:22

... process shows the process to be back in control. It continues to remain in that state for at least the next 14 samples. Figure 8.5 c-chart – polythene fisheyes – process in control Process control ... 2 ͱ ස 4=8. 220 Process control by attributes ᭹ The concepts of processes being in and out of statistical control applies to attributes. Attribute charts are not so sensitive as variable control charts for ... consecutive, the process is considered to be in statistical control. We may, therefore, reasonably assume that the process is producing a constant level of 2 per cent defective (that is the process capability’)...

Ngày tải lên: 11/08/2014, 20:22

... over the long term. When a process is under statistical control (i.e. only random or common causes of variation are present), a process capability index may be calculated. Process capability indices ... specification is inevitable. 10.2 Process capability indices A process capability index is a measure relating the actual performance of a process to its specified performance, where processes are considered ... the truth. In the case of the process capability this is true because: ᭹ there is always some variation due to sampling; ᭹ no process is ever fully in statistical control; ᭹ no output exactly...

Ngày tải lên: 11/08/2014, 20:22

... Understanding Statistical Process Control, 2nd Edn, SPC Press, Knoxville TN, USA. Discussion questions 1 (a) Using process capability studies, processes may be classified as being in statistical control ... pharmaceutical company carried out a process capability study on the weight of tablets produced and showed that the process was in statistical control with a process mean (X ) of 2504 mg and a ... Figure 10.6 Mean and range control charts – tablet weights Process problem solving and improvement 279 Figure 11.1 Strategy for continuous process improvement 278 Process problem solving and...

Ngày tải lên: 11/08/2014, 20:22

... F.109 66 H.C.L. control 27 Reactor stick 67 H.C.L. control 28 Reactor stick 68 H.C.L. control 29 Instrument/analyser 69 H.C.L. control 30 H.C.L. control 70 H.C.L. control 31 H.C.L. control 71 Reactor ... Reactor stick 9 H.C.L. control 49 Reactor stick 10 H.C.L. control 50 H.C.L. control 11 Reactor stick 51 H.C.L. control 12 Reactor stick 52 H.C.L. control 13 Feed poison 53 H.C.L. control 14 Feed poison ... 1.2 Electric control unit 652 51.9 Switching mechanism 4 120 10.2 Managing out-of -control processes 323 Figure 12.3 Frequent, irregular shift in process mean 324 Managing out-of -control processes situation...

Ngày tải lên: 11/08/2014, 20:22

... eliminating problems and aiding process control. 13.3 Improvements in the process To improve a process, it is important first to recognize whether the process control is limited by the common ... Projects’. These revolve around the three major strategies for processes we have met in this book: Process design/redesign Process management Process improvement to bring about rapid bottom-line achievements. Table ... customer requirements and the process that delivers these requirements – inputs, outputs, controls and resources. M Measure the current process performance – input, output and process – and calculate...

Ngày tải lên: 11/08/2014, 20:22

Ngày tải lên: 11/08/2014, 20:22

Ngày tải lên: 11/08/2014, 20:22

Ngày tải lên: 11/08/2014, 20:22

Ngày tải lên: 13/08/2014, 17:20

Ngày tải lên: 13/08/2014, 17:20