JPH0124572B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bending machine such as a press brake for forming thin sheet metal, and more particularly to a bending angle for detecting the bending angle during the bending process or at the end of bending in the bending machine. This invention relates to a detection device.

In general, in order to process and form a workpiece (plate material) into the required dimensions and shape using a bending machine, a bending angle is used to detect the angle during the bending process or at the end of bending, relative to the plate thickness dimension of the workpiece. A detector is required.

However, in conventionally used detectors of this type, the amount of movement of the workpiece is detected in proportion to the bending angle, and the bending angle is calculated from the amount of movement, so the detection process is complicated. In addition, since the area of the contact portion between the contact body of the detector and the workpiece, that is, the engagement portion, is small, there are problems such as errors occurring due to bending or twisting of the workpiece.

Furthermore, other detectors cannot accurately detect the bending angle when the V-groove width is small or the bending flange height is small, and it is difficult to move the detection device itself. There were other problems.

This invention was devised to improve the conventional problems as described above, and its purpose is to directly detect the accurate bending angle regardless of the bending shape of the workpiece or the deflection or twist of the workpiece body. The present invention provides a bending angle detection device for a bending machine that can be used in a bending machine.

For example, in a bending machine that bends plate material, the present invention includes a contact body that presses the surface of the plate material during the bending process and is rotatable in the longitudinal direction perpendicular to the lower apron following the bending of the plate material; The object of the present invention is to provide a detection section for detecting the rotation angle of the contact body, detect the bending angle of the plate material, and achieve the above object.

A preferred embodiment of the present invention will be described in detail below with reference to the drawings.

Fig. 1 is a front view of one embodiment of a bending machine embodying the present invention, Fig. 2 is a plan view of a bending angle detection device which is the main part, Fig. 3 is a sectional view of Fig. 1, and Fig. 4
The figure shows a sectional view of the attachment part of the bending angle detection device.

As shown in FIG. 1, an upper mold 3 is detachably attached to the tip of the upper apron 1 via attachments 5 and 7. As shown in FIG. A lower mold 11 is mounted on a lower apron 13 below the upper mold 3, and a plate material 9 is placed on the lower mold 11.

A fixing means 15 such as a magnet is removably provided on the side surface 14 of the lower apron 13.

The fixing means 15 is provided with a tracking member 23 that is biased in the direction of the workpiece, and is biased by a tracking biasing device built into the cylindrical body 27 as will be described later. A rotatable rotating member 49 is provided on the upper part of the tracking member 23, and a contact member 57 that can freely come into contact with the workpiece is provided on the rotating member 49. In addition, the rotating member 4
9 is provided with a large pulley 51, which operates in conjunction with a small pulley 45 provided on the detection device 44 via a conductive member 53, as will be described later, to transmit the rotation angle of the contact member 57 to the detection device 44. The detection device 44 is the tracking member 2
3 to detect the rotation angle of the contact member 57.

As shown in FIG. 4, a substantially U-shaped support 17 is fixed to the fixing means 15 with a fastener such as a bolt. Side plates 19 having substantially the same shape as the support body 17 are fixed to both sides of the support body 17. The inclined portions 20 of the side plates 19 constitute a guide portion, and the guide portion includes a slidable substantially T-shaped tracking member 2 having a rack portion 21.
3 is provided, and the rack portion 21 thereof is configured to mesh with a pinion portion 25 rotatably supported on both side plates 19.

A cylindrical body 27 (see FIG. 3) is fixed non-rotatably to one side of the side plate 19 by a pin 29. The shaft 31 is fitted into the pinion part 25, and the shaft 31
One end of the shaft 31 constitutes a head, and the other end of the shaft 31 constitutes a threaded portion, which is provided to fix the cylindrical body 27 with a fastener such as a nut.

A tracking biasing means 33 such as a leaf spring is provided inside the cylindrical body 27, and one end of the tracking biasing means 33 is inserted into the gap of the cylindrical body 27, and the other end is connected to the pinion portion 2.
It is inserted and fixed into the gap provided in the radial direction of 5. In FIG. 4, the pinion portion 25 is urged counterclockwise in order to always urge the rack portion 21 upward.

Returning to FIG. 4, the pinion portion 25 between the side plates 19
A shaft 35 is provided below, and both ends are rotatably supported by both side plates 19, and the shaft 35 is approximately T.
A shaped lever 37 is pivotally supported.

A locking portion 39 that can freely engage with the rack portion 21 of the tracking member 23 is provided at one end of the lever 37. When the lever 37 is rotated clockwise about the shaft 35, the locking portion 39 and the rack engage with each other. The portion 21 is disengaged, and the rack portion 21 is urged by the tracking urging means 33 to move toward the upper left in FIG.
When fixing the rack part 21, rotating the lever 37 counterclockwise will lock the locking part 39 and the rack part 2.
1 are engaged, and the rack portion 21 is fixed.

As shown in FIG. 2, a frame 41 is fixed above the tracking member 23 with a fastener such as a bolt.
1 is equipped with a detection member 43 for detecting the rotation angle. The detection member 43 has a shaft in the center, and the rotation angle of the shaft is calculated and displayed on the display.A small pulley 45 is installed at the end of the shaft via a locking member such as a pin. It will be done.

In FIG. 3, there is a shaft 4 above the tracking member 23.
7 is rotatably provided, and the shaft 47 is connected to the tracking member 23.
A substantially U-shaped rotating member 49 with both sides serving as guide surfaces.
The large pulley 51 is also formed into one piece. A transmission member 53 such as a timing belt is attached to the large pulley 51 and the small pulley 45.
(See Figure 1) is hung around.

The rotating member 49 has an inclined portion 55 on the lower mold 11 side.
A contact member 57 (see FIG. 1) is fitted so as to be movable in the left-right direction in FIG.
A guide portion 61 is provided on one side of the contact member 57 and serves to fix the contact member 57. The guide portion 61 is guided by the end of the locking member 59, such as a bolt screwed into the contact member 57.

As a means for locking the tracking member 23, the following embodiments are also possible.

As shown in FIG. 5, a cylindrical body 63 is fixed to the opposite side of the cylindrical body 27 attached to one side plate 19, and a fixing means 65 such as a magnet is installed inside the cylindrical body 63, and a locking member such as a bolt is attached to the cylindrical body 63. 67 so as to be non-rotatable and movable in the left and right directions in FIG.
It is always urged to the right in FIG. 5 by a bullet 69 such as a spring.

When fixing the pinion part 25, the fixing means 65
is excited and attracted to the pinion portion 25 to be fixed.

The operation of the bending angle detection device as described above will be explained.

Before placing the plate material 9 on the lower mold 11, the tracking member 23
is moved downward so that the contact member 57 is positioned below the upper surface of the lower die 11, and the tracking member 23 is fixed using the locking means in a state that does not impede the carrying-in and carrying-out of the plate material.

After carrying in and placing the plate material, the locking means is released and the contact member 57 is brought into contact with the plate material 9. In this case, the tracking biasing means 33 does not have a strong enough biasing force to push the plate 9 upward.

When the plate 9 begins to bend due to the approach of the upper apron 1 and the lower apron 13, the tracking member 23 moves upward as the plate 9 rotates upward. Along with the movement of the tracking member 23, the rotating member 49 rotates due to the contact state between the contact member 57 and the plate member 9, and the rotation of the large pulley 51, which is integrated with the rotating member 49, is transmitted to the small pulley via the transmission member 53. 45, and the detection device 4
4, the rotation angle, that is, the bending angle of the plate material can be detected.

After the bending is completed, the tracking member 23 is moved downward to position the contact member 57 below the upper surface of the lower die 11.

As shown in the first embodiment, the present invention provides the following effects.

Since the bending angle of the workpiece is directly detected, no complicated calculations are required.

Since the area of engagement between the workpiece and the contact body can be large, deflection and twist of the workpiece itself can be detected on average.

Even when the V-groove of the lower die is small or the height of the bending flange is small, the bending angle can be accurately detected because the contact member is movable.

Since the bending angle detection device itself is detachable, it is possible to easily move the lower apron in the longitudinal direction.

Furthermore, the present invention is not limited to the embodiments described above, and the present invention can be implemented in embodiments other than those described above.

[Brief explanation of drawings]

Fig. 1 is a front view of an embodiment of a bending machine embodying the present invention, Fig. 2 is a plan view of a bending angle detection device which is the main part, Fig. 3 is a cross-sectional view of - in Fig. 1; FIG. 4 is a sectional view of the mounting portion of the bending angle detection device, and FIG. 5 is a sectional view of a second embodiment of the tracking member locking means. (Explanation of symbols representing main parts of drawings), 1
...Upper apron, 3...Upper mold, 13...Lower apron, 11...Lower mold, 15...Fixing means, 23
... Tracking member, 57 ... Contact member, 44 ... Detection device.

[Claims]

1. In a cold roll forming method for a cylindrical body in which a metal strip is bent in its width direction through multiple roll stands, the cross-sectional shape of the metal strip is shaped in the same direction as the bending direction of the intended cylindrical body. A process of forming a shape consisting of both bent edge portions, a portion bent in the opposite direction to the bending direction of the cylindrical body inside the both edge portions, and a flat central portion. Characteristic cold roll forming method for circular tubular bodies. 2. In the cold forming rolls of a cylindrical body used when forming a metal strip into a cylindrical body by bending it in the width direction through multiple roll stands, the material to be formed is the outside of the intended cylindrical body. Excluding a work surface that is in contact with the surface and bends both edges of the material to be formed in the same direction as the bending direction of the cylindrical body, and a central portion of the material to be formed inside of both edges. A cold-forming roll for a cylindrical body, characterized in that a pair of roll pieces each having a working surface for bending and forming a portion in a direction opposite to the bending direction of the cylindrical body are configured such that mutual spacing can be adjusted. .