111 レーザ変位計とひずみゲージの組み合わせによる金型変形測定(若手優秀講演フェロー賞対象講演(3))

Abstract

The combination of a laser displacement transducer and strain gauge is a newly devised to measure the elastic deformation of the tool-workpiece interface in cold forging. A deep hole is bored close to the inside surface of the die container, and a steel pin is placed in the hole to detect the minute displacement of the near die-workpiece interface. The movement of the pin is men measured by the transducer which is attached on the die surface. The displacement of the installation position of the transducer is measured simultaneously by the strain gauge method to adjust the measurement obtained from the transducer. This method is applied to the measurement of die deformation in the backward extrusion process. The displacement distribution of the die-workpiece interface under various conditions is obtained. It is proved that the newly developed method is effective for the measurement of die deformation in forging.