Sheet metal hot stamping force measurement device

Abstract

A sheet metal hot stamping force measurement device of the present invention belongs to the sensing, measurement and control technology field, in particular relates to a stamping force test technology during a sheet metal hot stamping processing process. The force measurement device is composed of a pedestal, an upper cover, four piezoelectric quartz sensors, a lead wire output interface, a lead wire, a sealing ring, a pre-tightening bolt and a protection pad. The four piezoelectric quartz sensors are distributed inside the force measurement device evenly, and the sensitivity of the force measurement device is improved by a method of combining a plurality of sensors. An integrated load sharing ring structure is arranged in the center of the pedestal, so that the force measurement device is compact in structure and large in rigidity, the situation that the sensors are damaged by the overlarge stamping forces, can be avoided, and the measuring range of the force measurement device is expanded. The upper cover is equipped with a cooling hole, so that the situation that the high temperature is transmitted to the sensors and a press, can be avoided, the service life of the force measurement device and the stamping precision of the sheet material are improved. The force measurement device has the excellent characteristics of being high in rigidity and sensitivity and being high temperature resistant, and can be installed between a hot stamping press sliding block and an upper die directly, thereby measuring the stamping force directly.

Description

technical field [0001] The invention belongs to the technical field of stamping force testing, in particular to a sheet metal hot stamping force measuring device. Background technique [0002] Sheet metal hot stamping technology is a processing method that uses the good plastic deformation ability of the sheet metal at high temperature to stamp the sheet metal through a mold. Hot stamping has the advantages of high forming precision and small springback. It can complete complex shapes that can only be completed by cold stamping and multiple processes in one stamping, and the production efficiency is high. Stamping force is an important parameter that can reflect the hot stamping forming process. Product quality defects are closely related to changes in stamping force. Stamping force signals contain rich processing status and product quality information, which can be used to realize online quality monitoring and monitoring of sheet metal hot stamping products. Fault identifi...

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Problems solved by technology

[0004] The oil pressure measurement method is affected by factors such as oil temperature, leakage, and pressure fluctuations, so it cannot accurately test the punching force in real time, and is only suitable for occasions where the measurement accuracy is not high; Converted into electrical signals, in order to ensure the test sensitivity, the stiffness of the elastic parts is generally not high, resulting in poor rigidity of the machine tool system and affecting the sheet metal forming accuracy; the sensitive element itself of the piezoelectric measurement method has a high stiffness, and the amount of charge generated by the force is only equal to the force It is related to the value and has no direct relationship with the deformation. The improvement of its stiffness is not limited by the sensitivity, which can ensure that the stamping precision will not be affected. However, the piezoelectric internal stress sensor in the patent 201320488017.7 is directly installed in the punch base, and the blank holder force and impact The force acts on the sensor at the same time, and the influence of temperature on the sensor is not considered, so it is not suitable for sheet metal hot stamping, which requires blank-holding force and high-temperature operations.

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