Proceedings of the
World Congress on Micro and Nano Manufacturing (WCMNM 2022 )
19–22 September 2022, Lueven, Belgium
doi:10.3850/978-981-18-5180-3_RP36-0025
Optical Dimensional Metrology for Quality Inspection of the Functional Surface of Punching Tools
1Research & Development Department, Bruker Alicona, Austria
2Sales Director, Bruker Alicona, Austria
ABSTRACT
Quality assurance is indispensable in the development and production of high-performance punching tools. The measurement of surface quality and micro-geometries has a decisive influence on the quality of the tool and thus on the service life in production. Punching tools consist of various individual parts such as stamping dies, which usually have free-form geometries on the top surface which are often very difficult to measure with tactile measuring instruments. In addition to the top surface, it is very important to measure the outer vertical side walls because they serve as reference elements to verify the position of the functional surface. These vertical surfaces are difficult to measure with most optical measurement instruments as they usually have a limited measurable slope capability. In this paper a measurement solution based on focus variation is presented which on the one hand allows the measurement of the complete free-form geometries by advanced focus variation and on the other hand overcome the limitations with respect to the measurability of steep flanks using Vertical Focus Probing. For the inspection of the free-form geometry, a comparison between CAD model and measured 3D dataset is used. To demonstrate the strength and the capability, several measurements on various stamping inserts are performed.
Keywords: Advanced Focus Variation, Vertical Focus Probing, Punching Tool, Stamping Die.
1Research & Development Department, Bruker Alicona, Austria
2Sales Director, Bruker Alicona, Austria
ABSTRACT
Quality assurance is indispensable in the development and production of high-performance punching tools. The measurement of surface quality and micro-geometries has a decisive influence on the quality of the tool and thus on the service life in production. Punching tools consist of various individual parts such as stamping dies, which usually have free-form geometries on the top surface which are often very difficult to measure with tactile measuring instruments. In addition to the top surface, it is very important to measure the outer vertical side walls because they serve as reference elements to verify the position of the functional surface. These vertical surfaces are difficult to measure with most optical measurement instruments as they usually have a limited measurable slope capability. In this paper a measurement solution based on focus variation is presented which on the one hand allows the measurement of the complete free-form geometries by advanced focus variation and on the other hand overcome the limitations with respect to the measurability of steep flanks using Vertical Focus Probing. For the inspection of the free-form geometry, a comparison between CAD model and measured 3D dataset is used. To demonstrate the strength and the capability, several measurements on various stamping inserts are performed.
Keywords: Advanced Focus Variation, Vertical Focus Probing, Punching Tool, Stamping Die.
