JPH0455020A - Bending machine - Google Patents

Abstract

PURPOSE:To provide the bending machine which allows high-accuracy bending and easy handling and operates highly efficiently by detecting the temp. of griping members, computing the elongation quantity of dies by a difference in the temp. at the time of measuring the die sizes and correcting this quantity to the set moving quantity of upper and lower rams. CONSTITUTION:A lower die detector 7 and an upper die size measuring instrument 8 are mounted to a detector mounting plate 9 and a sliding plate 10 and are constituted to allow dealing with the case the width of the upper and lower dies is changed. The detector and instrument are coupled to a shaft of a rotating cylinder 11 and can be thereby rotated 180 deg.. The reason for such constitution lies in that the projecting or recessed die can be detected even if this die is mounted to either of the upper die or the lower die. The detection is not possible unless the upper die size measuring instrument 8 is used for the projecting die and the lower die size measuring instrument 7 is used for the recessed die. A rotating cylinder mounting plate 12 is coupled to the shaft of a longitudinal cylinder 13 and stands by backward while measurement is not made. The die measurement is necessitated to be made once at the time of insertion of the die. The temp. of the gripping member needs to be detected without fail by a temp. detector at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bending machine for bending sheet metal materials.

[Conventional technology]

Conventionally, in a bending processing machine, after inserting and engaging the upper and lower molds into a gripping part, the upper and lower molds are aligned under a predetermined pressure and used as a machining origin. Based on this processing origin, processing is performed by controlling the pressure applied to the mold and the amount of mold depression, taking into account the bending stress due to the material to be processed and the coefficient according to the plate thickness 9 bending angle.

[Problem to be solved by the invention]

However, in the above-mentioned conventional technology, variations occur in product dimensions between a product processed immediately after the processing machine starts and a product processed after a certain period of time. Therefore, processing is performed while performing sampling inspections during processing and measuring whether the product dimensions are within predetermined tolerances. If the specified tolerances are not met, the processing machine must be stopped and the processing pressure, mold pressure, and mold push amount must be reset to the specified values, and tedious calculations must be made to correct the set values. Such work was necessary. The challenge was to create a bending machine that could easily perform more precise machining and improve operating rates. The present invention has been made to solve these problems, and its purpose is to provide a highly accurate, easy-to-handle, and highly operational bending machine that can reduce variations in product dimensions.

[Means to solve the problem]

The bending machine of the present invention has means for measuring the dimensions of the upper and lower molds after inserting the molds and before starting machining, and has temperature detecting means in the representative member that engages and grips the molds. ,and,
The present invention is characterized in that the processing machine control system includes means for calculating the elongation amount of the mold based on the detected temperature, and the set movement amount of the upper and lower rams is corrected by the elongation amount of the mold.

[Effect]

According to the present invention, by measuring the dimensions of the upper and lower molds after inserting the molds and before starting machining, the exact height dimensions of the molds used for machining can be grasped and the gripping member at that time can be determined. The temperature is detected and stored in the processing machine control system that calculates the amount of mold elongation, and during each bending process, the temperature of the gripping member is detected again just before the upper and lower rams move the set amount. The elongation of the mold is calculated based on the temperature difference at the time of the mold dimension measurement, and the amount of elongation of the mold is corrected to the set travel amount of the upper and lower rams.This enables high-precision bending, is easy to handle, and is highly operational. It can be used as a bending machine.

〔Example〕

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

FIG. 1 shows an example of measuring the dimensions of upper and lower molds and detecting the temperature of the bending machine of the present invention. There are upper and lower molds, but since they are all the same in configuration, we will explain the detection example of the lower mold. A lower ram 2 is attached to the lower ram shaft 1 and can move up and down by a set amount of movement. A mold 4 is positioned in the mold holder 3 on two orthogonal surfaces and fixed with fixing screws 5.A temperature sensor 6 is fixed to the lower ram 2 with an insertion screw, and is positioned near the center of the lower ram 2. The lower mold dimension measuring device 7 and the upper mold dimension measuring device 8 are mounted on the back to detect the edges of the upper and lower molds.This measuring device uses a magnetic type. However, a detection method using a laser beam or the like is also possible. Fig. 2 shows an overall embodiment of the mold measuring device for the bending processing machine of the present invention. The lower mold detector 7 and upper mold dimensions described above are shown. The measuring device 8 is attached to a detector mounting plate 9 and a slide plate 1o, and has a configuration that can be used when the width of the upper and lower molds is changed.
It is connected to the shaft of No. 1 and can rotate 1800 times. This is to enable detection regardless of whether a convex or concave mold is attached to either the upper mold or the lower mold. Convex molds cannot be detected unless the upper mold dimension measuring device 8 is used, and concave molds cannot be detected unless the lower mold dimension measuring device 7 is used. The rotating cylinder mounting plate 12 is
It is connected to the axis of the front/rear shifter 15, and when not measuring,
I'm waiting at the back. The mold measurement only needs to be carried out once when inserting the mold (at the same time, the temperature of the gripping member must be detected by the temperature detection B6 [Effects of the Invention]) As explained,
It has a means for measuring the upper and lower mold dimensions after the mold is inserted and before the start of processing, and has a temperature detection means in the representative member that engages and grips the mold, and according to the detected temperature, The processing machine control system has a means to calculate the elongation of the mold, and the setting movement of the upper and lower rams is corrected by the elongation of the mold, which automatically calculates the mold dimensions and the mold at the same time. By measuring the temperature and re-measuring the mold temperature each time the upper and lower rams move, the amount of mold extension corresponding to the temperature change is automatically corrected to the set travel amount of the upper and lower rams.
It has the effect of reducing sampling inspections during processing, preventing a decrease in operating rate due to setting value correction work and stopping the processing machine, and enabling high-precision and easy-to-handle bending processing that reduces product dimensional variation. .

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the bending machine of the present invention. FIG. 2 is a schematic diagram showing an embodiment of a mold measuring device for a bending machine according to the present invention. 1-m-Lower ram shaft 2--Lower ram 3--1/Mold holder 4--Mold 5--Fixing screw 6--Temperature Detector 7 --- Lower mold dimension measuring device 8 --- Upper mold dimension measuring instrument 9 --- Detector mounting plate 10 ---・・Slide plate 11−・−・・−・Rotary cylinder 12−・−1・Rotary cylinder mounting plate 15−・・−1・Front and rear cylinder

Claims (1)

[Claims] The bending processing machine has means for measuring the dimensions of the upper and lower molds after inserting the molds and before starting machining, and has temperature detecting means in a representative member that engages and grips the molds, and
1. A bending processing machine, characterized in that the processing machine control system includes means for calculating the elongation amount of the mold based on detected temperature, and the set movement amount of the upper and lower rams is corrected by the elongation amount of the mold.