JP2563026B2 - Cutting device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device suitable for sequentially cutting hard materials such as metal materials such as steel materials and non-ferrous metal materials such as ceramic materials under the same conditions.

[0002]

2. Description of the Related Art Conventionally, a hard material such as a steel rod (hereinafter referred to as a material to be cut) is cut into a predetermined length, or
A rotating disk cutter is used as a device that sequentially cuts a specified portion of the material to be cut, and the disk cutter is moved to the material to be cut by a reciprocating mechanism such as a feed screw mechanism or a fluid pressure cylinder. Devices that are configured to perform processing are widely adopted.

[0003]

However, in such a cutting device, since the feeding speed of the disk cutter to the material to be cut and the speed of cutting the material to be cut by the disk cutter are the same, the disk is cut. If the feed speed of the cutter is increased, the cutting may be unreasonable and the disc cutter may be damaged. If the feed speed is decreased, the processing time becomes long and the efficiency decreases.

It is also possible to adopt an appropriate fast return mechanism so that the initial feeding speed of the disc cutter and the returning speed after cutting are high, but the disc cutter is designed to cut the material to be cut every time. As the diameter of the disc cutter gradually wears down, the feed amount to the material to be cut, that is, the cutting start position changes, and a complicated control means is required to change the feed speed of the disc cutter correspondingly. Furthermore, it is difficult to move the disk cutter in a straight line with the fast-return mechanism, and bending occurs in the cutting direction with respect to the material to be cut, which makes it impossible to perform accurate and smooth cutting. There is.

Further, although it is necessary to change the rotational speed, the feed amount, etc. of the disk cutter according to the hardness and shape of the material to be cut, it is extremely difficult to adjust it with a conventional cutting device. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a cutting device capable of accurately and efficiently cutting a material to be cut according to hardness and shape of the material to be cut.

[0006]

In order to achieve the above object, a cutting device of the present invention comprises a screw rod which is rotated at a constant speed by driving a first motor, and a base end portion of which is screwed by the rotation of the screw rod. A long hypotenuse link member that moves in the longitudinal direction of the rod, one end of which is pivotally attached to the center of the long hypotenuse link member and the other end of which is pivotally attached to the axis of the screw rod. A short hypotenuse link member having a length half that of the long hypotenuse link member, and a disc cutter that is rotated by a second motor drive is provided on the tip side of the long hypotenuse link member. The rotation center axis of the disk cutter
Is rotatably supported at the tip of the long hypotenuse link member, and
Rotate the disk cutter by driving the second motor.
While the constant speed rotation of the threaded rod by the first motor
The long hypotenuse phosphorus along the screw rod.
Move the base end of the member to the other end of the short hypotenuse link member.
Change the feed speed of the above disc cutter from high speed to low speed
It is configured so that

[0007]

The Scott Russell type linear motion mechanism is constituted by the screw rod and the long and short hypotenuse link members, and when the screw rod is rotated by the motor drive, the disc cutter mounted on the tip of the long hypotenuse link member is in a straight line. To move accurately. In addition, despite the constant rotation speed of the screw rod, the moving speed of the disk cutter is fast in the initial stage of the forward movement to enable fast-forwarding, and at the final stage of the forward movement, the moving speed becomes slow and the member to be cut is fed at a low speed. Can be cut with.

Further, the diameter of the disk cutter rotating at a constant rotation speed gradually decreases due to the cutting of the member to be cut, and the peripheral speed also decreases in proportion thereto, but the cutting diameter reaches the cutting processing position as much as it becomes smaller. Therefore, the cutting speed for the member to be cut is delayed, and the feed speed of the disc cutter is lowered by the movement mechanism during that time. Therefore, when the disc cutter has a large diameter, it cuts at a large peripheral speed and a high feed speed, and when the disc cutter has a small diameter, it cuts at a small peripheral speed and a slow feed speed. It is possible to achieve excellent cutting.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.
In FIG. 1, A is a cutting device, B is a gripping mechanism for a material C to be cut made of a hard material such as steel, and these are a pedestal D.
It is arranged in. The cutting device A constitutes a Scott-Russell type linear motion mechanism with a screw rod 1 having an appropriate length and long and short hypotenuse side link members 2 and 3, and a disc cutter 4 is rotatable at the tip of the long hypotenuse side link member 2. The rotary drive motor 5 for the disc cutter 4 is provided on the long side link member, and the rotary drive motor 6 for the screw rod 1 is further provided. Disc cutter 4
Rotation drive motor 5 and screw rod 1 rotation drive motor
Reference numeral 6 is an inverter motor.
Rotate the driving motor to the first motor 6 and the disk cutter 4.
The drive motor is the second motor 5.

The detailed structure of the cutting device A will be described in detail. The screw rod 1 is rotatably supported at its one end on one side of the frame D by bearings 11 and 11 and has a long hypotenuse link. The member 2 has its base end pivotally attached 12 to a nut body 7 screwed to the screw rod 1, and the short hypotenuse link member 3 has one end at the center of the long hypotenuse link member 2. The other ends are pivotally attached to the fixed base D at appropriate positions on one side, respectively.

Further, the disc cutter 4 has a rotation center axis 1
5 is rotatably supported by a bearing 16 fixed to the tip of the long hypotenuse link member 2, and the rotation center shaft 15 is attached to one side of the long hypotenuse link member 2 by the second motor 5 to rotate the belt 17; It is configured to be rotated through. As the rotation transmission mechanism for the disc cutter 4 by the second motor 5, an engaging gear mechanism or other appropriate means may be adopted without using the belt 17.

On the other hand, a first motor 6 for rotationally driving the screw rod 1 is installed in parallel with the screw rod 1 on one side of the mount D, and as shown in FIG. The pulleys 20 and 21 are fixed to the rotary shaft 18 of the motor 6 and the shaft end 19 of the screw rod 1 protruding from the bearing 11, and an endless belt 22 is stretched between the pulleys 20 and 21. First
The rotation of the motor 6 is transmitted to the screw rod 1. Also, since the motor 6 is an inverter motor,
The rotation speed of the screw rod 1 can be changed. In addition,
Such a rotation transmission mechanism may also employ the meshing gear mechanism or other appropriate means as described above.

Further, a rotary encoder 8 for detecting a rotation angle of the screw rod 1 is arranged on the pedestal D in connection with the projecting shaft end portion 19 of the screw rod 1, and one side portion of the pedestal D. A diameter measuring mechanism 9 of the disc cutter 4 is installed in the.
The diameter measuring mechanism 9 has an expandable rod 9a oriented in the diameter direction of the disc cutter 4, and the tip end face of the rod is brought into contact with the outer peripheral end face of the disc cutter 4 to determine the diameter of the disc cutter 4 from the extension / contraction length. It is designed to detect

The gripping mechanism B is disposed on the straight line of the disc cutter 4, and the gripping mechanism B is provided on the support base 1.
The rotary shafts 22, 22 are rotatably supported on both sides of the rotary shaft 0, and the pair of left and right holding pieces 23, 23 are mounted on the rotary shafts 22, 22.
And the levers 24, 24 are fixed to each other, and the clamping piece 23 is caused by the expansion and contraction operation of the cylinder 26 connected between the levers 24, 24.
By opening and closing 23, the member C to be cut is sandwiched between the sandwiching recesses 25, 25 provided on the facing surfaces of the sandwiching pieces 23, 23.

The holding piece 2 of the holding mechanism B having the above-mentioned structure
The operation of the cutting device A having the above-described configuration for cutting the member C to be cut sandwiched by the members 3 and 23 will be described. The first and second motors 5 and 6 can be operated from the state where the disc cutter 4 is retracted. For example, the disc cutter 4 rotates at a constant number of rotations and the nut body 7 is rotated by the rotation of the screw rod 1.
Move at a constant speed along. By this movement, the tip of the long hypotenuse link member 2, that is, the rotation center axis 15 of the disk cutter 4 is perpendicular to the screw rod 1, and a straight line connecting the fixed pivot portion 14 of the short hypotenuse link member 3 and the tip. Go straight toward the gripping mechanism B.

As shown in FIGS. 4 and 5, the moving amount and moving speed of the disk cutter 4 are large at the initial stage of the movement of the nut body 7 which moves at a constant speed, but gradually as the nut body 7 is screwed. Becomes smaller. Therefore, the disc cutter 4 is fast-forwarded until it reaches the member to be cut C sandwiched by the sandwiching pieces 23 of the gripping mechanism B, and when it reaches the member to be sliced C and cuts, the feed speed becomes slow. It is a thing.

Since the disk cutter 4 is in such a feeding state, the best cutting at the time of cutting is first performed according to the hardness of the member C to be cut with the large-diameter disk cutter 4 as a reference. If possible conditions, that is, the number of revolutions of the disc cutter 4 and the cutting feed speed are set,
The disc cutter 4 is fast-forwarded until it reaches the member C to be cut, and at the time of cutting, it can be cut at a slow feed speed.

Further, when the disc cutter 4 is gradually reduced in diameter due to the cutting of a large number of members C to be cut, the peripheral speed of the disc cutter 4 rotating at a constant rotational speed becomes slower.
The distance to reach the member C to be cut becomes longer by the amount of wear, and during that time, the feed speed of the disc cutter 4 is slightly reduced. Therefore, the feed speed and the circumference of the disc cutter 4 are slightly slower than those when the diameter is large. The cutting of the member C to be cut is started at a speed.

As described above, when the peripheral speed of the disk cutter 4 is high, the feed speed at the start of cutting of the member C to be cut is set at a high feed speed, and when the peripheral speed of the disk cutter 4 decreases, the peripheral speed of the disk cutter 4 decreases accordingly. The cutting of the member C to be cut is performed reliably and accurately by starting the cutting of the member C at a low feed rate.

Further, the rotary encoder 8 detects the rotation angle of the screw rod, and the measuring mechanism 9 measures and detects the diameter of the disk cutter 4 every time the member C to be cut is cut.
By controlling the second motor 5 for rotationally driving the disk cutter 4 and the first motor 6 for rotationally driving the screw rod so as to obtain the optimum cutting condition according to the diameter, the rotational speed and the feed of the disk cutter 4 are controlled. The speed (that is, the initial feed speed from the stop position to the cutting start position in the vicinity of the material to be cut and the feed speed at the time of cutting) is set so that more efficient and good cutting can be performed. is there.

After the cutting process of the member C to be cut by feeding the disc cutter 4, the screw rod 1 is reversely rotated by the first motor 6 to return the disc cutter 4 to the original position, and the rotation is stopped at that position. In preparation for cutting of the next member C to be cut, the disk cutter 4 is also returned through the link mechanism and the first motor 6 during high-speed rotation. The disc cutter 4 can be quickly returned.

[0022]

As described above, according to the cutting device of the present invention, the screw rod which rotates at a constant speed by the drive of the first motor and the base end portion of the screw rod in the longitudinal direction by the rotation of the screw rod. A long hypotenuse link member which moves to the center, and one end of which is rotatably pivoted at the center of the long hypotenuse link member and whose other end is rotatably pivoted on the axis of the screw rod. And a short hypotenuse link member having a length half that of the link member .
By installing a disk cutter that rotates by a motor drive
The central axis of rotation of the disc cutter is set to the tip of the long hypotenuse link member.
Since the end portion is rotatably supported , the screw cutter can be accurately moved in a straight line by rotating the screw rod at a constant speed by the first motor drive. The amount of movement of the cutter is increased so that fast-forwarding can be performed, and the amount of movement is gradually decreased during cutting, which enables smooth and accurate cutting processing.

Further, the cutting of a large number of members to be cut causes the disc cutter to wear, gradually decreasing in diameter and slowing down the peripheral speed, but the distance to reach the member to be cut becomes longer by the amount of wear, During that time, the feed speed of the disc cutter slightly decreases, and the cutting of the member to be cut can be started with the feed velocity and peripheral speed which are slightly slower than those when the disc diameter is large. No good cutting process can be done.

[Brief description of drawings]

FIG. 1 is a schematic plan view of an entire apparatus including a cutting device of the present invention,

FIG. 2 is a simplified perspective view of a cutting device,

FIG. 3 is a plan view showing a moving state of the disc cutter,

FIG. 4 is a diagram showing a movement amount of a disc cutter,

FIG. 5 is a diagram showing the moving speed of the disc cutter.

[Explanation of symbols]

1 screw rod 2 long hypotenuse link member 3 short hypotenuse link member 4 disk cutter 5 second motor 6 first motor 7 nut body 9 diameter measuring mechanism

Front page continuation (72) Shinji Matsuo 1 Nishinozu, Oita-shi, Oita-shi Inside Nippon Steel Co., Ltd. Oita Works (72) Inventor Yoshiharu Kimura 3-526 Himejima, Nishiyodogawa-ku, Osaka Okumura Machine Manufacturing Incorporated (72) Inventor Masao Takai 3-5-26, Himejima, Nishiyodogawa-ku, Osaka Okumura Kikai Seisakusho Co., Ltd. (56) Reference JP-A-50-114691 (JP, A)

Claims (1)

(57) [Claims] 1. A screw rod that rotates at a constant speed by driving a first motor, a long hypotenuse link member whose base end moves in the length direction of the screw rod by the rotation of the screw rod, and a long hypotenuse link member. A short hypotenuse link having one end rotatably pivotally attached to the center of the rod and the other end pivotally attached to the axis of the screw rod and having a length half that of the long hypotenuse link member. And the tip of the long hypotenuse link member
A disk cutter that is rotated by a second motor drive is disposed on the side of the disk, and the rotation center axis of the disk cutter is set to
The second motor is rotatably supported by the distal end of the locking member.
Drive while rotating the above disc cutter.
The constant rotation of the screw rod by the first motor
From the base end of the long hypotenuse link member along the screw bar
Part to the other end of the short hypotenuse link member to
Change the feed rate of kutta from high speed to low speed
A cutting device characterized by being configured .