METHOD FOR MEASURING FORCE OF CRANK HOT STAMPING PRESS BY TORQUE OF TAKE-UP SHAFT Russian patent published in 2025 - IPC G01L1/06 

FIELD: measuring.

SUBSTANCE: invention relates to forging and stamping equipment, namely to methods and devices for measurement and limitation of press forces, and is intended to protect CHSP against process overloads. Disclosed is a method for simplified measurement of hot stamping press force by maximum deformations and torque of the press receiving shaft using contactless transmission of signals from the sensor of receiving shaft rotation frequency. For reliability of measurements of torque of the take-up shaft of the press, its stiffness is preliminarily determined, which is periodically checked for compliance with the initial one by means of an ultrasonic method. At that, to determine maximum internal shear deformations in cross-sections of the elastic receiving shaft under the action of external moments, the method of finite elements is used, which is based on the method of sections. For this purpose, the receiving shaft is brought to an equivalent shaft of simple round section, a base section is selected, which is divided into n elements of length h, and the base section spinning time is calculated. Then, using the required lengths of coaxial delay lines, the lengths of which are selected based on allowable torques of the receiving shaft, a frequency method of measuring phase shift using broadband FM modulation is used. At that, as the periodic parameter, the frequency of rotation of the receiving shaft is used with its preliminary conversion into a modulating low-frequency signal of a saw-tooth symmetrical shape and additional input of oscillations of the modulated carrier frequency of the broadband high-frequency oscillator of the sweeping frequency, thus forming broadband direct and delayed in coaxial delay line broadband frequency-modulated signals. Direct and delayed broadband FM signals are mixed in the mixer until their zero difference beating frequency is selected, which carries information on the maximum shear deformations and the value of the press receiving shaft torque and, as a result, the press force during the forming process, and thus the required allowable torques on the rotating take-up shaft of the press are calculated.

EFFECT: simplification of measurements of press force by maximum deformations and torque moment and preservation of stability of measurements.

1 cl, 14 dwg