Utveckling av metoder att mäta centrering av skruvhål i skär
There have been, in some rare cases, difficulties with clamping of inserts with U-holesin their tool holder. According to the complaints, the inserts could not be properlyclamped or could fracture when clamped. A study has shown that variations inclamping behaviour are mainly depending by the position of the screw hole in the toolholder and the centering of the screw hole in the insert.The focus of this project has been the centering of screw hole in insert. It has beenshown that the screw holes are not always enough centered in the insert. Theproblem may occur after a certain step in the production, i.e. peripheral grinding.Today, the centering can be measured by a certain measurement jig. Themeasurement jig has a very good Gauge R and R value but is not easy to use,especially if it is to be reinstated into the production. The aim of this thesis has beento use SmartScope for developing a new method for measuring the centering ofscrew hole in insert. The goal with the new method was to be able to measure fasterand to be easier to use than the existing one.The project was started with exercises and exploration of some of the functions ofSmartScope and its software Measuremind 3D. Parallel with this, a study was made ofthe existing documentation for a better understanding of the problem.A method which measures how well the screw holes are centered in their inserts hasbeen developed. The method consists of a number of measuring tools which arejoined into a measurement sequence. Measurements of single inserts are fullyautomated. Provided that a system which picks and puts the inserts in specificlocations can be implemented, a series of inserts can be measured fully automated.This method is faster and especially more automated than the current measurementjig. Measurements have shown that the accuracy of the method is well within thetolerance and that it has a good repeatability.