JPH0277612A - Method for measuring bend of round material - Google Patents

Abstract

PURPOSE:To measure an accurate bend regardless of the magnitude of the rotary deflection of a measuring device by indexing the actually measured value of an object to be measured through the comparison with the deflection data of the measuring device obtained by the measurement of a master. CONSTITUTION:A master 1 is revolved and the rotary deflection of the master at every predetermined angle at a position in a predetermined axial direction is measured by a displacement sensor 5. The output signal from the sensor 5 is inputted to a controller 6 to be stored in the memory 6a within the controller 16. Next, the master 1 is detached from rolling centers 3 and a solid or solid round rod-shaped object 2 to be measured is supported by the rolling centers 3 and the rotary deflection thereof is measured in the same way as the master 1 by the sensor 5 and the measured result is inputted to the controller 6. The measured value of the object 2 to be measured is corrected on the basis of the measured value of the master 1 by the operation part 6b of the controller 6 to index bend quantity.

Description

[Detailed description of the invention] Industrial applications A method for measuring the bending of round materials using an automatic nine-axis bend straightening machine, etc.

Conventional technology Conventionally, to measure the bending of a solid or hollow round material, the object to be measured (round material) is rotatably supported by a rolling center that constitutes the bending measuring device of a bend straightening machine, and the object to be measured is rotated. Alternatively, the object to be measured is held with a collet chuck that constitutes a bending measuring device, and measured with an outer diameter reference while rotating with the collet chuck, and the measured value is taken as the amount of bending.

Problems to be Solved by the Invention However, in such a measurement method, rotational runout of the rolling center or collet chuck that holds the object to be measured directly appears as a measurement error, making it difficult to accurately measure bending. Met.

On the other hand, in order to reduce the rotational run-out of the rolling center or collet chuck that holds the object to be measured and perform high-precision bending measurements, the rolling center or collet chuck, etc. must be formed with high precision and high rigidity. Not necessarily,
An increase in the number of man-hours required for manufacturing these products and a rise in manufacturing costs were unavoidable.

Means for Solving the Problems The measuring method of the present invention measures a master with a bending measuring device, stores rotational runout data of the measuring device in a controller, and then measures the bending of the round material to be measured using the bending measuring device. The method is characterized in that the amount of bending of the round material is determined by actually measuring and comparing the measured value with the rotational runout data.

According to the present invention, since the actual measurement value of the object to be measured is compared with the runout data of the measuring device obtained by the master measurement, accurate bending measurement is possible regardless of the magnitude of the rotational runout of the bending measuring device. becomes possible.

Example Embodiments of the present invention will be described in detail below based on the drawings.

In FIGS. 1 and 2, l is a master, and this master 1 is molded into approximately the same shape as the object to be measured 2, and is polished so as to have no bends. and,
Either support the axial position of this master ■ with the rolling center 3 (see Figure 1), or hold the master 1 on the collet chuck 4 (see Figure 2), or rotate the master 1 with a pulse motor, etc. (not shown). (360°), and the displacement sensor 5 measures the rotational deflection of the master l at each predetermined angle (predetermined number of pulses) at a predetermined axial position. The output signal from this displacement sensor 5 is input to the controller 6,
It is stored in the memory 6a in the controller 6. Next, the master I is removed from the rolling center 3 or the collet chuck 4, and the solid or hollow round rod-shaped object 2 is supported by the rolling center 3 or held by the collet chuck 4, and the measurement is carried out in the same way as the measurement of the master I. The rotational runout is measured by the displacement sensor 5, and the measurement result is input to the controller 6. The controller 6 uses its calculation unit 6b to correct the measured value of the object to be measured 2 based on the measured value of the master (2), and determines the amount of bending. That is, the correction value is displayed by a printer, etc. not shown (see Figures 3a to 3a).
Figure 3b).

Further, the amount of bending is determined by automatically operating the straightening machine based on the correction value of the controller 6. That is, it becomes possible to automatically correct the curvature of the object to be measured 2.

For the measurement of the master 1 and the object to be measured 2, for example, a proximity switch or a phototube switch is installed near the rotating part of the rolling center 3, etc., so that measurement can always be started from a constant angle (0° position). It goes without saying that

Effects of the Invention As described above, the present invention measures the master with a bending measuring device, stores the rotational runout data of the measuring device in the controller, and then actually measures the bending of the round material to be measured with the bending measuring device. The amount of bending of the round material is determined by comparing the measured value with the rotational runout, so the bending of the treasure to be measured is determined regardless of the presence or absence of rotational runout of the rotational support of the object to be measured. It becomes possible to accurately measure the amount and correct the curvature of the object to be measured. In addition, it also has the effect of facilitating maintenance and management of the rotating parts of the bending measuring machine that supports the master and the object to be measured.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a bending measuring device showing one embodiment of the present invention, FIG. 2 is a schematic diagram of a bending measuring device showing another embodiment of the present invention, and FIGS. 3a to 3b are bending measuring devices. It is a line diagram showing the results. ■ Master, 2 Object to be measured, 3 Rolling center (bending measuring device), 4 Collet chuck (bending measuring device), 6 Controller. 2 people Figure 1 Figure 2

Claims (1)

[Claims] (1) After measuring the master for bending measurement with a bending measuring device and storing the rotational runout data of the measuring device in the controller, the bending of the round material to be measured is actually measured by the bending measuring device, and the actual measured value is A method for measuring the bending of a round material, characterized in that the amount of bending of the round material is determined by comparing the rotational runout data.