Glossary / Lexicon

Deutsch: Zylindrizität / Español: Cilindricidad / Português: Cilindricidade / Français: Cylindricité / Italiano: Cilindricità

Cylindricity in the quality management context refers to a geometric dimensioning and tolerancing (GD&T) measurement that describes how close an object's surface conforms to a perfect cylinder. It is a 3D form tolerance that assesses the deviation of a cylindrical object's surface from a theoretical perfect cylinder. Cylindricity is crucial in industries where precision mechanical components are required, such as automotive, aerospace, and manufacturing, ensuring that parts fit together correctly and function as intended without causing undue wear or failure.

General

Cylindricity control is part of quality assurance processes that involve precise measurement and evaluation techniques. It helps in maintaining the quality and functionality of cylindrical parts by ensuring they meet strict manufacturing specifications. The tolerance specifies the allowable limit of the surface's deviation from a perfect cylindrical shape, considering factors like roundness and straightness over the entire length and circumference.

Description

Managing cylindricity involves:

• Measurement: Using advanced equipment such as coordinate measuring machines (CMM), laser scanners, or specialized cylindricity gauges to measure the surface profile of cylindrical parts.
• Evaluation: Comparing the measured data against the cylindricity tolerance specified in the design to determine if the part is within acceptable limits.
• Quality Control: Implementing corrective actions in manufacturing processes if parts do not meet the specified cylindricity criteria to ensure future production meets quality standards.

Application Areas

• Automotive Industry: Ensuring the quality of engine pistons, cylinders, and shafts, where precise fit and function are critical for performance and longevity.
• Aerospace: Manufacturing components such as hydraulic lines and landing gear parts, where high precision is required for safety and efficiency.
• Precision Engineering: Producing components for medical devices, robotics, and machinery that require high levels of accuracy for reliable operation.

Examples

• A manufacturer of hydraulic cylinders uses cylindricity measurements to ensure that the cylinders will provide smooth and efficient operation without leaks.
• In the production of automotive engine components, controlling cylindricity helps in minimizing vibration and wear, enhancing the engine's performance and durability.

Risks

Neglecting cylindricity tolerances can lead to part failure, increased wear, and operational inefficiencies. In critical applications, such as in aerospace or medical devices, this can result in significant safety risks. Therefore, maintaining cylindricity within specified limits is essential for quality management and ensuring the reliability and safety of mechanical systems.

Summary

Cylindricity in the quality management context is a measure of how accurately a cylindrical part conforms to its ideal geometric shape. It is a crucial aspect of ensuring the quality, functionality, and longevity of components in precision-demanding industries. Effective control of cylindricity through precise measurement and strict adherence to tolerances is essential for producing parts that meet high-quality standards and perform reliably in their intended applications.

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