Designing Closed Quality Control Loops For Stable Production Systems

Transcription

1 Designing Closed Quality Control Loops For Stable Production Systems Laboratory for Machine Tools and Production Engineering WZL of RWTH Aachen University, Germany Laboratory on Engineering and Intelligence MTA SZTAKI, Hungarian Academy of Sciences, Budapest, Hungary 20 th 23 rd June 2011, Budapest, Hungary Prof. Robert Schmitt Henrik Glöckner Sebastian T. Stiller Prof. László Monostori Dr. Zsolt János Viharos Brief Presentation Of The Research Project (QC)² - Quantifiable Closed Quality Control Run-time: Funding organizations It is not the strongest of the species that survives, nor the most intelligent. It is the one that is the most adaptable to change. ~ Clarence Darrow, famous American lawyer How can companies cope with change caused by external disturbances which are swept in by the markets andits customers as well as internal disturbances within entrepreneurial processes? The holistic project approach is based on the scientific and industrial expertise of production, control and information technology Slide 2

2 Three Research Institutes Cooperate With SME To Synthesize Scientific And Industrial Research Competences Collaborative Approach Information Technology Perspectives Production Technology Cybernetics Research task Initial Situation, Challenge and Hypothesis Heuristic framework Systems Value Chain Quality Closed Control Loops Software Application Information Scientific definition of Development of a modeling approach for Development of methodologies for a qualitative and quantitative assessment of 15 SME from Germany and Hungary Prototypical implementation and validation of developed methods and tools Blueprints for Quality Control Loops Description of generic Quality Control Loop structures t Definition of SME s requirements concerning the application of Quality Control Loops Slide 3 Quality According To ISO 9000 A Maximization Problem Quality... degree to which a set of inherent characteristics fulfils requirements. Source: ISO 9000 Customer requirements Product characteristics Overlap rate between requirements and characteristics Restriction 1 Market-sided assumption: Companies already know or can decide who their customers are and what they want! Restriction 2 Organizational-sided assumption: Companies possess all skills that are necessary to operate exactly as their strategies dictates! Companies cannot trust in a unidirectional maximization of quality target parameters, but have to balance their position within the target field considering conflicting target parameters Slide 4

3 The Entrepreneurial Quality Philosophy Entrepreneurial Quality Field Corporate Orientation Customer Requirements Corporate Skills Overlap rate between requirements and characteristics All three fields are continuously shifting and changing over time Entrepreneurial Quality has to plan, monitor, control, and adapt the desired equilibrium within the field of entrepreneurial quality constantly The mechanisms of systematically support companies to find an equilibrium within the field of Entrepreneurial Quality Slide 5 The Aachen Quality Model A Framework For Entrepreneurial Structures And Activities Custome er/ Suppli ier irements ier Requi Quality Stream Products Field Data Custome er/ Suppl Resources and Services Slide 6

4 The Aachen Quality Model A Framework For Entrepreneurial Structures And Activities The Quality Stream as the unique feature of the model consists of two structural elements: The Quality Forward Chains include the proactive and preventive per product group The Quality Backward Chain organizes the reactive and corrective actions for all product groups targets and strategies organizational structures management systems values and identity Quality Stream Market ts requirement Quality Forward Chains products Market Quality Backward Chain field data equipment & infrastructure information & communication staff technologies & methods controlling Resources & Services The Aachen Quality Model as a framework for quality related structures and tasks Slide 7 In Order To Cope With External And Internal Disturbances Operational Feedback Mechanisms Are Required Mathematical models for feedback systems Two perspectives on Closed Loop Control Enterprise and Models Disturbance Actuator Process Control unit Sensor unit - Control variable Leading variable Customers Resource management Continual improvement of the Quality System Input responsibility Product realization Measurement, analysis and improvement Product Output Customers Requirements Satisfaction Information Value added Source: ISO 9001 Mathematical description of technical Description of organizational feedback systems according to DIN loops for process stabilization, continuous improvement and organizational learning (ISO 9001) combine the advantages of both approaches Slide 8

5 A First Step Towards The Integration Of Technical And Organizational Feedback Approaches within the Aachen Quality Model Market requirements Targets and strategies Implementation Meta system Organizational structures systems Quality Stream Quality Forward Chains Quality Backward Chain Decision making Identity and value products Felddaten Filtering Quality Actuator Quality Controller Quality Sensor Market Quality Sensor: Systematic monitoring and capturing of quality data Data processing and interpretation Filtering and transmission of data and information Detection of deviations Quality Controller: Analysis of information and comparison to given targets Identification of root causes Definition and selection of Adaption of all units within the feedback loop according to changes in policy Quality Actuator: Coordination and initialization of decided Implementation of Primary proof of efficiency enable enterprises to cope with internal and external disturbances. Slide 9 Horizontal And Vertical On Different Organizational Levels Strategy Planning and Control System Quality Control Loop Vertical Product Quality Control Loop Vertical Process Quality Control Loop Shop Floor Horizontal Process Horizontal Product Horizontal Control Loops: Located within a single organizational level Describe how one process is being controlled and how this control loop interacts with other control loops E.g. end-of-line inspection on shop floor level Vertical Control Loops: Adhere between at least two different organizational levels Describe how control loops of lower levels are monitored, controlled and designed E.g. management assessment of business processes Slide 10

6 Process Gather data Provide relevant information Negotiation of responsibility Consensus? Status 10 Deviation Significant Data processing Identify deviation Verify deviation Record deviaiton detected? deviation? intervention necessary Brief Quality Actuator - set appointments - confer powers Implement measure Select Quality Actuator 1 Verify success of measure Identify most efficient measure Measure successful? Evaluate (temporal, financial effort) Record data Process Catalogue measure Define achievable Define achievable Process Analyze deviation Analyse causes (Root Causes) Adjust known Select Quality Controller Known Case? Brief Quality Controller Check for similiar cases Define urgent 1 Provide relevant data Urgent necessary? Negotiation of responsibility Consensus? Prioritization Design Of Effect Reduction of down time Reduction of settling time Improvement following of set values Definition of system boundaries Analysis and description of controlled system Identification of Sensors: Detect and provide data Controllers: decision making, selection of actuators Actuators: affect the controlled system by taking (process, product, human) Assessment of Quality Control Loops Lead questions for the analysis of Are closed cause-and-effect relationships available? Are control loops interconnected or control loop elements associated redundantly? Are all process steps of the Quality Control Loop accomplished completely, effectively and efficiently? Are all measured variables, control variables and actuating variables described and quantifiable? Are these variables directly related to the objective target of the process chain? Can disturbance variables be considered and dampened in their effect? Slide 11 Process Reference Model Of Closed Loop Quality Control (QC)² Reference Model Level 2 Data acquisition Controller Reporting and Actuator Allocation Adaption Information processing Primary proof of efficiency Actuator Controller Sensor Documentation Definition of Measures Sensor Reporting and Controller Allocation Containment actions The (QC)² Reference Model Level 1: General Structure Defines the universal structure of a Quality Control Loop with its three main elements Sensor Controller Actuator Specifies the 9 main phases of closed loop quality control Level 2: Detailed Process Steps Generic but detailed description of all required process steps within a Quality Control Loop Enables Companies to identify, describe and optimize the structures of existing Accelerates the design of enterpriseindividual Level 3: Tailored blueprints Best Practice for selected processes Slide 12

7 Assessment Of Level 3 Level 2 Level 1 are assessed on three levels Level 1: Performed Provides a qualitative ti assessment Evaluates the degree of performance based on a detailed questionnaire (analysis of each process step) Weaknesses in the structure of a Quality Control Loop can be identified Level 2: Managed Includes a quantitative assessment Based on KPIs Considers timing parameters, costs and required resources Level 3: Established Maturity level of Quality Control Are implemented for all main business processes? Are analyzed and improved on a regular basis? Slide 13 Are Suitable To Operationalize Required Information Flows For Closing Existing Gaps Conclusion/ Hypothesis Robust and quantifiable allow companies to identify, use and distribute needed information Complex interactions in value chains can be modeled and combined to closed z - y e x w Quality control loops describe the interaction of organization, factors of production and information flows with the objective of controlled quality including effective and efficient processes and workflows Quality is an adjustable value, which is embodied by various parameters and needs to be determined from multiple perspectives. The objective is not to maximize quality but to control it along the value chain Independent technical control loops and organizational improvement processes are insufficient for the task of controlling quality Further steps Development and description of blue-prints for quality loops Improving the developed hypothesis Implementation of the (QC)² reference model and the assessment tool into a software program A sufficient closed Quality Control Loop structure supports companies to stabilize their production systems within the field of Entrepreneurial Quality Slide 14

8 Thank you very much for your attention! Acknowledgement Thanks to Slide 15