A Drawing May Contain 100+ Requirements
Every requirement must still be met, while only a limited number directly determine function, assembly and reliability.
CTQ QUALITY MANAGEMENT
Critical Quality Characteristics Should Be Controlled Before Final Inspection Function-Based CTQ Identification · Process Control · Measurement & Traceability
Conventional inspection determines whether a finished part is acceptable. CTQ management begins with product function, assembly relationships and failure risks to identify the characteristics that truly determine performance and reliability. Zhongde’s integrated manufacturing system carries the same CTQ through material, forming, precision machining, surface finishing, assembly and final validation.
- Identify CTQs from product function and failure risks
- Translate critical requirements into process controls
- Link drawings, process results, inspection and production lots
Function-Based
Defined from product performance, assembly and failure risk
Risk Prevention
Critical characteristics defined before manufacturing
Process Control
CTQs deployed to related manufacturing and inspection steps
Traceable Records
Revisions, process results and production lots remain linked
WHAT IS CTQ
Identify the CTQs That Truly Determine Product Quality
A drawing may contain more than one hundred dimensions, tolerances and technical requirements, but they do not affect product function equally. CTQs are the limited number of characteristics that directly influence assembly, performance, reliability or special customer requirements.
How CTQs Are Identified and Managed
01
Understand Product Function and Assembly
Clarify the part’s role, mating interfaces, loading conditions and operating relationships.
02
Evaluate Failure Impact and Process Risk
Assess how deviations affect assembly, performance and reliability against process capability.
03
Define CTQs and Control Standards
Specify critical dimensions, geometry, surfaces, materials or functional acceptance criteria.
04
Deploy Process, Measurement and Records
Assign process controls, measurement methods, inspection frequency and traceable records.
Critical Dimensions and Geometry
Diameter, position, flatness, concentricity and mating dimensions
Critical Surfaces and Process Results
Roughness, coating thickness, cleanliness, hardness and heat-treatment condition
Critical Assembly and Functional Results
Torque, press-fit depth, leak rate, rotational condition and functional testing
Quality and Efficiency Improvements from CTQ Management
Stronger Quality Assurance
Critical risks remain visible and functional failure risk is reduced.
Earlier Problem Detection
Risks are identified and corrected before they become batch defects.
Focused Resources
Inspection and control resources are concentrated on critical items.
Higher Production Efficiency
Shorter inspection time and faster release improve overall efficiency.
Better Quality Cost Allocation
Control investment is placed where it generates the greatest value.
CTQ management does not reduce control of other requirements. All requirements remain compliant with the drawing, while the limited characteristics that determine function and reliability receive a higher level of control.
CTQ VS GENERAL QUALITY CONTROL
CTQ Management Is Not Treating Every Dimension as Equally Critical
Conventional final inspection focuses on whether the finished product is acceptable. CTQ management starts from product function, assembly relationships and failure risks to identify the characteristics that truly determine performance and reliability.
Post-Process Judgment
GENERAL CONTROL
01
Manufacture to Drawing
02
Final Inspection
03
Pass / Fail
04
Rework / Late Risk Exposure
Early Identification · Focused Control
CTQ MANAGEMENT
01
Product Function
02
Failure Risk
03
Identify CTQs
04
Process Control & Records
KEY DIFFERENCE
Conventional inspection answers “Is the product acceptable?” CTQ management answers “Which characteristics determine whether the product works properly, and how can loss of control be prevented?”
Earlier Risk Detection
Less Batch Rework
Lower Functional Failure Risk
More Rational Quality Cost Allocation
WHY ZHONGDE IS DIFFERENT
One Integrated Factory Keeps the Same CTQ Connected Across Processes
A single CTQ is often influenced by several upstream and downstream operations. Zhongde maintains consistent drawings, datums, compensation relationships, process data and feedback within one factory, carrying the CTQ from engineering review through final validation.
Unified Control Line
Controlled Drawing Revision Unified CTQ Standard Common Datums & Compensation
Forming
Control blank deformation, machining allowance and datum stability
Precision Machining
Control bore size, roundness, concentricity and position
Surface Finishing
Manage coating allowance, masking and treatment deformation
Assembly
Confirm press force, insertion depth and fit condition
Final Validation
Verify rotational resistance, runout and operating condition
One CTQ: Bearing Bore and Shaft-System Fit
One CTQ: Bearing Bore and Shaft-System Fit
Forming
Control blank deformation, machining allowance and datum stability
Precision Machining
Control bore size, roundness, concentricity and position
Surface Finishing
Manage coating allowance, masking and treatment deformation
Assembly
Confirm press force, insertion depth and fit condition
Final Validation
Verify rotational resistance, runout and operating condition
Records & Feedback Line
First-Article Results Process Records Nonconformance Feedback Lot Traceability
Segmented Multi-Supplier Production
- Drawing, datum and CTQ information can become disconnected
- Downstream issues require repeated cross-company communication
- Quality records and responsibility boundaries remain fragmented
Zhongde Integrated Factory
- The same CTQ remains connected across related processes
- Downstream issues feed directly back to upstream operations
- Process results, issues and production lots remain linked
