JPS6385426A - Arithmetic unit for cutting quality testing device - Google Patents

Abstract

PURPOSE:To obtain a high-accuracy measured value automatically by sensing the fine strain of a mount base by a strain gauge provided to the mount base, storing the strain in a peak holding measuring instrument through a strain amplifier and performing arithmetic operation. CONSTITUTION:A signal from the strain gauge K provided to the mount base M is sent to the amplifier (b) through bridge boxes (a) and (a'). The output of the amplifier (b) is stored in the peak holding measuring instrument (c) as the instantaneous maximum time value of the strain of the neck part of the mount base M caused by a cutting force. An arithmetic unit (d) reads the value, calculates the cutting quality in an X and a Y direction, and displays the cutting quality value on a display device (e) automatically. Consequently, the high- accuracy measured value is obtained automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an arithmetic device that can perform simple and automatic measurements in a measurement system of a pendulum type sharpness testing device.

[Conventional technology]

There are many cases in which it is necessary to measure cutting force, etc., and there are various methods depending on the purpose. Among these methods, a pendulum-type cutting tester is often used to measure the sharpness of knives.

However, with the pendulum type cutting test machine, the time required for cutting is 1~
Since it is very short at 10m-8ec, a digital memory scope or the like is used to determine the sharpness. In addition, to determine the cutting energy, it is advantageous to measure the set angle and swing-up angle of the pendulum, but the method of reading a set needle is cheap and easy to measure, but it is difficult to read the angle by eye. Since the measurement accuracy is poor and the errors are large, phototubes and the like are mainly used to compensate for this.

[Problem that the invention seeks to solve]

Conventionally, in order to determine the sharpness, as mentioned above, it was necessary to use expensive equipment such as a digital memory scope, and cutting energy was measured using a phototube or the like.

These devices are expensive, cannot perform the measurement automatically, and have unsatisfactory accuracy in the measured values.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide an arithmetic device for a sharpness testing device that can automatically obtain more accurate measured values using an inexpensive device.

[Means for solving problems]

The present invention provides a pendulum-type sharpness testing device in which a signal from a strain gauge provided on a workpiece is sent to an amplifier through a bridge box to be amplified, and a storage device that stores the peak value of the signal, and a storage device that stores the held value. This arithmetic device is characterized by being provided with an arithmetic unit that compares and reads data inputted in advance and calculates a sharpness value from that value.

The cutting energy is measured by using a rotary encoder that detects the angle of the pendulum and the swing-up angle, and the arithmetic unit that calculates the energy required to cut the material based on the output from the rotary encoder. It is characterized by the fact that it has been established. Then, the sharpness is determined from the value of distortion of the stage and the value of cutting energy, and is displayed on the display device.

[Effect]

In the present invention, the sharpness can be easily determined by sensing minute distortions of the workpiece using a strain gauge provided on the workpiece, storing the distortion in a peak hold measuring device via a strain amplifier, and calculating it. Can be done.

Furthermore, the set angle, swing-up angle, etc. of the pendulum can be detected using a rotary encoder, and by connecting the rotary encoder to an up-down counter, angular accuracy can be detected to the second. By improving the accuracy of detecting the angle, it is also possible to accurately determine the cutting energy.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a view of the main body of the pendulum sharpness tester of the present invention, where A is a side view and B is a front view. Also provided are a resistance wire strain gauge K that functions as a sensor for measuring sharpness, and a rotary encoder L for angle measurement for determining the energy required for cutting.

The resistance wire strain gauge is attached to the side and top and bottom surfaces of the neck of the workpiece stand extending from the main body of the testing machine, and the direction of movement of the blade during cutting (horizontal: X) and the two directions perpendicular to it (perpendicular: Y) are detected.

As shown in Figure 2, the resistance wire strain gauges are connected to bridge boxes a and a', and the output terminals of the bridge boxes a and a' are connected to a strain amplifier, and the output terminals of the bridge boxes a and a' are connected to a strain amplifier. The peak hold measuring device C stores the temporal maximum value (peak value) of distortion of the workpiece table head due to the cutting force. Arithmetic unit d reads the value and calculates
, calculates the sharpness in the Y direction, and automatically displays the sharpness value on the display device e.

Fig. 3 shows the cutting position as the origin (A), the set angle, the swing-up angle (C), the equipment loss measured under no load (2), and the energy required for cutting (where tα = Oβ).

To calculate the true cutting energy, use rotary encoder L.
senses the swing-up angle after cutting, and the value is read by the arithmetic unit d via an up-down counter f, and the respective potential energies are calculated from the set angle, swing-up angle, equipment loss, etc. It is done as follows.

The calculation unit d displays the calculated cutting energy on the display device e together with the sharpness value, and also controls the automatic lifting and swinging down of the pendulum at the same time, and automatically performs measurement calculations of the sharpness and cutting energy. It is something that can be done.

In this embodiment, a programmable controller is employed as the calculation unit d, so that it is possible to further improve functions such as calculation of sharpness values, automatic control of the entire measuring device, and statistical processing of measured values.

Further, in this embodiment, an example is shown in which a resistance wire strain gauge is used, but it goes without saying that other types of strain gauges such as a semiconductor type strain gauge may be used.

〔Effect of the invention〕

As described above, according to the present invention, in a pendulum sharpness tester, there is no need for the very expensive digital memory scope used in the past, and an arithmetic unit with the same or higher functionality can be used with a cheaper device. It was obtained.

'Furthermore, in the embodiment, a case has been described in which a programmable controller is used as the arithmetic unit, but various arbitrary functions can be provided by selecting other appropriate units.

[Brief explanation of the drawing]

FIG. 1 is a side view and a front view of a measuring instrument main body according to an embodiment of the present invention, FIG. 2 is a block diagram of a measurement calculation system, and FIG. 3 is a diagram showing the principle of cutting energy measurement. J: pendulum, K: resistance wire gauge, L: rotary encoder, M: stage, N: knife, a-a' bridge box, b = strain amplifier, C: peak hold measuring device, d
: Arithmetic unit, e: Display device, f near-tub down counter. Go to one. Sono 1

Claims (1)

[Scope of Claims] 1. In a measurement system for a pendulum-type sharpness test device, a strain gauge for measuring deformation is provided on a stage, a storage device for storing the peak value of the output of the strain gauge, and a storage device for storing the peak value of the output of the strain gauge; A computing device for a sharpness testing device, comprising a computing unit that compares stored contents with data input in advance and displays the results. 2. Claim 1, comprising a rotary encoder that detects the set angle and swing-up angle of the pendulum, and an arithmetic unit that calculates the energy required to cut the sample to be measured from the output of the rotary encoder.
Computing device for the sharpness test device described in Section 1.