JPH0453644B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blade feeding device in a cutting device.

When cutting materials, especially when cutting pipe materials with low rigidity, it is required to suppress the generation of vibration during cutting as much as possible in order to obtain a good finish at the cut end. In conventional cutting equipment, the blade feeding device is
As shown in Fig. 1, the proximal end of an arm 2 that supports the blade 1 and its rotational drive device in the center is pivoted to a base frame 3, and the other end of the arm 2 is attached to the side of the base frame 3. Connected to the piston 4a of the hydraulic cylinder 4 via a connecting pin 5,
The hydraulic pressure of the hydraulic cylinder 4 is controlled by the flow control valve 6 to raise the cylinder 4a, thereby rotating the arm 2, and moving the blade 1 toward the workpiece W fixed by a clamp device (not shown). After the cutting is completed, the cylinder 4a is retracted to move the blade 1 in the opposite direction to perform quick return. However, in this type of blade feeding device, there is inevitably a gap in the connecting pin 5 portion that rotatably connects the arm 2 and the piston 4a to each other, and therefore, conventionally, the cutting depth of the blade 1 during cutting tends to fluctuate. The load fluctuated, causing vibration. Furthermore, since the feed speed of the blade 1 is adjusted by the flow control valve 6 of the hydraulic cylinder 4, the feed speed fluctuates depending on the load, making it impossible to obtain stable feed. was the cause of deterioration.

On the other hand, there are systems that use a screw or gear mechanism driven by a motor to obtain stable blade feeding motion at a constant speed, without using a hydraulic cylinder. The cutting depth of the blade fluctuates, inevitably causing vibration, and the return speed of the blade after cutting cannot be increased, resulting in a longer cycle time.

The present invention has been made in view of the above points, and eliminates the play between the arm and its driving part during cutting and maintains the blade feed speed constant to eliminate fluctuations in the depth of cut. It is an object of the present invention to provide a blade feed device for a cutting device that prevents vibrations from occurring during cutting and allows the blade to return quickly after cutting is completed. To achieve this object, the present invention has a blade feeding mechanism in a cutting device in which an arm supporting a blade is pivotally supported on a base frame, and the arm is oscillated to obtain a feeding motion of the blade with respect to a material to be cut. In the device, a hydraulic cylinder for swinging the arm is installed between the arm and the base frame, and is driven at a constant speed substantially along the blade feeding direction and can be freely engaged with and detached from the arm from the front in the blade feeding direction. This is characterized by the provision of a slide block that comes into contact with the arm and regulates the swinging speed of the arm.

An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 2 is a schematic diagram of a blade feeding device embodying the present invention. In FIG. 2, the blade 11 and its rotational drive device are supported at the center of an arm 12, and the base end of the arm 12 is attached to a base frame 13 so that the arm 12 can swing up and down.
It is centrally supported. A cylinder 14a of a hydraulic cylinder 14 pivotally connected to the base frame 13 is connected to the swinging end side of the arm 12 by a connecting pin 15, and the arm 12 is swung up and down by the drive of the hydraulic cylinder 14, and a clamping device (not shown) is connected to the swinging end side of the arm 12. Blade 11
The blade 11 is moved toward and away from the workpiece W fixed above the workpiece.

On the other hand, adjacent to the swinging end of the arm 12, a threaded rod 16 extends vertically approximately along the feeding direction of the blade 11.
is pivotally supported on the base frame 13, the threaded rod 16 is connected to a reversible motor 17 fixed to the base frame 13, and a slide block 18 is screwed onto the threaded rod 16. As shown in FIG. 4, the slide block 18 is surrounded on three sides by slide blades 19a of a guide 19 fixed to the base frame 13, thereby preventing rotation and being able to move only in the direction along the threaded rod 16. The threaded rod 1 is guided by the reversible motor 17.
6.

A forked receiving plate 2 is provided at the swinging end of the arm 12.
0, and the receiving plate 20 is moved so that the slide block 18 is located forward of the receiving plate 20 with respect to the feeding direction of the blade 11, that is, the slide block 18 is located above the receiving plate 20 in FIG.
The forked portion of the roller 21 is inserted into the threaded rod 16, and the roller 21, which is pivotally supported on the slide block 18, is brought into contact with the facing surface of the receiving plate 20 in a detachable manner.

In the apparatus of the present invention, when feeding the blade 11 to cut the material W to be cut, the hydraulic cylinder 1 is used.
4 to press the receiving plate 20 of the arm 12 against the roller 21 of the slide block 18, and the reversible motor 17 rotates the threaded rod 16 to move the slide block 18 at a predetermined speed in the feeding direction (upward).
By moving the arm 12 to rotate the arm 12, the material W to be cut is cut. Moreover, the displacement of the position of the receiving plate 20 and the slide block 18 due to the rotation of the arm 12 is absorbed by the rolling of the roller 21.
Here, the arm 12 is connected to the slide block 1 during cutting.
8 restricts upward movement, and the hydraulic cylinder 14 always applies upward force greater than the cutting load, so play between the arm 12 and the drive section is completely eliminated, and at the same time the feed rate is can be maintained at a constant speed of the slide block 18 controlled by the reversible motor 17, so vibrations are prevented from occurring.

Furthermore, after the cutting is completed, as shown in FIG. 3, when the piston 14a of the hydraulic cylinder 14 is retracted,
The receiving plate 20 of the arm 12 separates from the slide block 18, and the arm 12 returns at high speed, and the blade 11
A fast reversal is performed. Thereafter, while the next workpiece W is being set, the reversible motor 17 is driven in the opposite direction to move the slide block 18 back to its original position.

In the above embodiment, a screw mechanism was used as the drive mechanism for the slide block, but the present invention is not limited to this, and any mechanism that can withstand high loads and drive the slide block at a constant speed may be used. It is also possible to use a gear mechanism, for example a rack and pinion. Further, the driving source may be selected from an electric type, a hydraulic type, etc. as appropriate.

Furthermore, although the above embodiment shows an upward cutting type cutting device in which the material to be cut is set above the blade, it is also possible to use a downward cutting method in which the material to be cut is set below the blade, or other types of cutting devices. Of course, the present invention can also be applied to.

As explained in detail using one example above,
According to the present invention, play between the arm and its drive unit during cutting is eliminated, and the feed speed of the blade can be kept constant, so fluctuations in the depth of cut are eliminated, thereby reducing vibration during cutting. This prevents the occurrence of blemishes and enables stable cutting. Further, since a hydraulic cylinder is used to drive the arm, the blade can be returned quickly after cutting is completed, and the cycle time of the cutting operation can be shortened.

Therefore, the present invention is particularly suitable for cutting devices where minimizing vibration and shortening cycle time are the most important issues, such as cutting devices that use carbide tip blades to cut bundles of pipe materials. It is.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a conventional blade feeding device, FIGS. 2 to 4 are an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of a blade feeding device implementing the present invention, and FIG. 3 4 is a schematic configuration diagram when the blade returns quickly, and FIG. 4 is an enlarged plan view of the slide block support portion. In the drawing, 11 is a blade, 12 is an arm, 13
1 is a base frame, 14 is a hydraulic cylinder, 15 is a connecting pin, 16 is a threaded rod, 17 is a reversible motor, 1
8 is a slide block, 19 is a guide, 20 is a receiving plate, and 21 is a roller.

Claims (1)

[Claims] 1. In a blade feeding device of a cutting device in which an arm supporting a blade is pivotally supported on a base frame and the arm is oscillated to obtain a feeding motion of the blade with respect to a material to be cut, there is a gap between the arm and the base frame. A hydraulic cylinder for swinging the arm is attached to the arm, and the hydraulic cylinder is driven at a constant speed substantially along the blade feeding direction and detachably contacts the arm from the front in the blade feeding direction to regulate the swinging speed of the arm. A blade feeding device for a cutting device, characterized in that it is provided with a slide block that moves the blade.