JPS5837092B2 - Pipe cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe material cutting device that continuously cuts various metal pipe materials into required lengths while the pipe is in a running state.

Conventionally, this type of device reciprocates the upper and lower cutting blades along the running material line, and when the moving speed of the upper and lower cutting blades synchronizes with the traveling speed of the pipe material to be cut during the forward stroke, the upper cutting blade is lowered. Generally, the device is constructed so that the cutting can be performed by

However, these devices do not necessarily have mechanical rationality, and have various drawbacks such as requiring a fairly large driving source and causing dimples at the cut end of the pipe material to be cut. This is what we are doing.

However, when it comes to getting rid of dimples,
The above-mentioned device is equipped with a notch blade that advances and retreats from the side in order to notch the upper part of the pipe material to be cut at the cutting position immediately before the upper cutting blade makes the downward cut.

Although this device does have the effect of eliminating dimples, there is a separate problem in that the cutting speed cannot be increased because of interference between the notch blade and the upper cutting blade.

Therefore, the present invention was made with the aim of solving the above-mentioned drawbacks of the conventional example, and aims to eliminate dimples and the above-mentioned interference problem by employing two types of rotating blades, and also uses two types of rotating blades. As the rotational drive mechanism, a spline shaft or a shaft with a sliding key is adopted that allows the double rotary blades to easily follow the feeding speed of the pipe material to be cut. A reciprocating drive mechanism is attached to realize the reciprocating motion of both rotating blades. As mentioned above, by rationally combining a spline shaft or a shaft with a sliding key with a crank mechanism, energy saving is achieved and the dimple This enables high-speed continuous cutting without any blemishes.

To begin with, the main structure of the present invention is shown. A reciprocating drive mechanism is disposed on the machine base, which is composed of a guide member that guides the machine, a crank, and a connecting rod whose both ends are connected to the crank and the machine base with pins. Then, on the machine base, a notching rotary blade that notches the upper part of the pipe material to be cut that is fed on the material feeding line and a cutting rotary blade that cuts the pipe material to be cut at the notch position immediately after notching are arranged, and the above-mentioned Both rotary blades are provided with a spline shaft or a shaft with a sliding key that transmits rotational driving force while allowing reciprocating motion corresponding to the reciprocating motion of the machine base, and the crank of the reciprocating drive mechanism and the spline shaft or A shaft with a sliding key is a tube material cutting device connected to the same rotary drive body via a detachable gear train.

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

Two guide shafts 1, 1, which constitute a part of a reciprocating drive mechanism to be described later, are arranged in parallel at a predetermined interval, and a machine base 2 is attached to brackets 3, 3 fixed on both sides of the guide shaft 1.
, 1 are slidably inserted, so that they can be reciprocated within a required range.

The guide shafts 1, 1 are fixed to the external frame 20.

A fixing mechanism for clamping the pipe material P to be cut is arranged at the center of the machine 2, slightly closer to one side, and a rotary cutting blade 8 is arranged closer to the other side.
to be placed.

A notching rotary blade 7 for notching the upper part of the pipe material P to be cut is disposed substantially above the fixing mechanism.

Both rotary blades 7 and 8 are fixed in the circumferential direction and slidably in the axial direction on spline shafts 9 and 9 arranged in parallel with the guide shafts 1 and 1 of the machine base 2 at corresponding positions, respectively.

Of course, it is also possible to install a shaft with a sliding key in place of the spline shafts 9, 9 under the same conditions.

A rotary drive body 21 is connected to the spline shafts 9, 9, or a shaft with a sliding key if applicable, so as to rotate them at the same speed and in opposite directions.

For example, in FIG. 1, a spline shaft 9 (including a shaft with a sliding key) to which the notch rotary blade 7 is attached.

The same applies hereafter) is rotated clockwise, and the cutting rotary blade 8 is rotated clockwise.
The spline shaft 9 to which the rotary drive body 21 is attached is connected to rotate the rotary drive body 21 in a counterclockwise direction.

This rotary drive body 21 uses a variable drive source such as a DC motor, and also shares the reciprocating drive mechanism of the machine base 2, which will be described later.

The rotational driving force is transmitted to the spline shafts 9, 9 through a suitable gear train, as will be described later.

As shown in FIG. 1, the notch rotary blade T has a blade fixed to the tip of a substantially trapezoidal base, and the rear end of the base is formed so as to be attached to a boss meshed with a corresponding spline shaft 9. The rotary cutting blade 8 has a semi-circular concave blade at the tip of a substantially trapezoidal base, and the rear end of the base is attached to a boss meshed with a corresponding spline shaft 9. It was formed.

The rotary blades 7 and 8 are attached to the spline shafts 9 and 9 in such a way that the cutting rotary blade 8 can cut the pipe P to be cut immediately after the notch rotary blade 7 notches the upper part of the pipe P to be cut. stipulated in

The bosses of both rotary blades 7 and 8 are supported by the frame 10 of the machine base 2, and the spline shafts 9 and 9 are configured to reciprocate in accordance with the reciprocating movement of the machine base 2.

The fixing mechanism includes an immovable fixing part 5 having a semicircular groove on the inner surface;
Movable fixed part 6 having a similar semicircular groove on the surface facing this
The movable fixed part 6 is constituted by a drive mechanism that moves the movable fixed part 6 forward and backward toward the immovable fixed part 5 side.

Note that both semicircular grooves mentioned above form the lower blade.

As shown in FIGS. 1 and 3, for example, the drive mechanism is connected to the frame 10 of the machine base 2 on the outside of the notch rotary blade 7.
L-shaped arms 1 1 , 1 1 rotatably pivoted on
, cams 12, 12, L attached to the boss of the notch rotary blade 7
Rollers 13, 13 rotatably attached to the upper ends of the L-shaped arms 11, 11, length-adjustable pressing bodies 14, 14 screwed to the lower ends of the L-shaped arms IL11, and a movable fixed part 6
It consists of return springs 4, 4 attached to the.

When the boss rotates, the L-shaped arms 11, 11 perform a rotational movement in the counterclockwise direction in FIG. , 14 to press the movable fixed part 6 against the immovable fixed part 5 (that is, perform a clamping operation on the pipe material P to be cut).

Furthermore, when the rollers 13.13 are no longer restricted by the cams 12, 12, the movable fixed part 6 returns to its original position (unclamped) by the action of the return springs 4, 4, and this causes the L-shaped arm 11.11 to move clockwise. Rotate in the rotational direction.

Needless to say, the cams 12, 12, when the notch rotary blade 7 and the cutting rotary blade 8 respectively notch and cut the pipe material P to be cut, the L-shaped arms 11, 11 press against the pressing body 14.
, 14 are pressed against the movable fixed part 6, that is, the shape is determined so that the movable fixed part 6 and the immovable fixed part 5 clamp the pipe material P to be cut.

Further, the machine base 2 is provided with a reciprocating drive mechanism composed of the guide shafts 1, 1, a disc crank 15, and a connecting rod 16 connected with a pin to the lower part of the machine base 2 and near the outer periphery of the disc crank 15, respectively. Set up

As shown in FIGS. 4 to 6, the disc crank 15 is arranged vertically on the reciprocating direction extension of the machine base 2, and is pin-coupled to one end of the connecting rod 16 at a point near its outer periphery. .

The other end of the connecting rod 16 is pin-coupled to a bracket 17 fixed to the lower part of the machine base 2.

As shown in FIGS. 5 and 6, this disc crank 15 is fixed to the tip of a drive shaft 18 disposed at right angles to the reciprocating direction of the machine base 2, and the other end of this drive shaft 18 is is connected to a rotary drive body 21 outside the machine via a joint 19.

22 is a bearing for the drive shaft 18.

When the rotary drive body 21 is driven in this manner, the disk crank 15 rotates, and the machine base 2, which is regulated by the guide shafts 1, 1, causes a reciprocating linear motion by the connecting rod 16.

In this mechanism, as long as the rotary drive body 21 rotates at a constant speed, the reciprocating motion of the machine base 2 will draw a so-called sine curve in the relationship between speed and time, and the pipe material P to be cut will be cut in a predetermined section. cannot synchronize with the material feeding speed.

Therefore, in order to solve this problem and move the machine 2 at a speed synchronized with the feeding speed of the pipe material P to be cut in a predetermined stroke section, for example, detection of the material feeding speed, detection of the rotation angle of the disc crank 15 ( Detection of the angle formed between a line connecting the pin connection position with the connecting rod 16 and the center, for example, with a horizontal straight line passing through the center is performed at the same time, and a correction coefficient for each minute angle divided into 150 disc cranks is calculated in advance. A control device equipped with the input memory calculates the above two detection signals and the correction coefficient together, and sends a control signal to the rotary drive body 21 connected to the disk crank 15 to rotate at a predetermined speed. must be configured.

A gear 23 is fixed in the middle of the drive shaft 18, and this gear 23 meshes with a gear 24 above.

As shown in FIG. 5, the gear 24 is fixed together with a bevel gear 26 to an intermediate shaft 25 arranged parallel to and above the drive shaft 18.

The bevel gear 26, as shown in FIG.
The rotational driving force of the rotary driving body 21 is transmitted to the spline shaft 9 of the rotary cutting blade 8 through the intermediate shaft 25 and bevel gears 26 and 27.

A gear 28 is further fixed to the spline shaft 9, and meshes with a gear 29 fixed to another spline shaft 9 so that they rotate in opposite directions.

Gears 28 and 29 have the same diameter.

Thus, by driving the rotary drive body 21, the reciprocating drive mechanism and the spline shafts 9, 9 are operated simultaneously.

The above-mentioned series of gear trains mesh with each other so that notching and cutting are performed by both rotary blades 7 and 8 approximately in the middle of the forward stroke of the machine base 2.

Since this embodiment is configured as described above, when cutting the pipe material P to be cut into a predetermined length, the device is first started, and the machine 2, which is stopped in the middle of the return stroke, is operated, and the reciprocating movement is started. Let it start.

Since the machine base 2 is stopped in the middle of the backward stroke as described above, it starts operating from the remaining backward stroke.

The pipe material P to be cut is fed by a material feeding device (not shown) and protrudes a predetermined length in front of the fixing mechanism at the beginning of the backward stroke of the machine base 2 and the subsequent forward stroke.

At the same time, the forward stroke speed of the machine 2 operated by the reciprocating drive mechanism is synchronized with the material feeding speed, and then the fixing mechanism moves the pipe material P to be cut to both fixing parts 5.
, 60 is fixed in the semi-circular groove with a fastener.

This cutting of the pipe material P to be cut is performed by the rotary blades 7 and 8 at approximately the middle of the outgoing stroke synchronized speed section of the machine base 2.
This is done using the semicircular groove No. 6 as the lower blade.

The reciprocating drive mechanism includes the disk crank 15, as described above.
The connecting rod 16 and the machine base 2 are configured with guide shafts 1, 1 that restrict the movement in a predetermined linear direction, and the rotational motion of the disc crank 15 is converted into linear reciprocating motion and transmitted to the machine base 2. The uniform rotational motion of the disc crank 15 inevitably causes the reciprocating motion of the machine base 2 to draw a sine curve in the relationship between speed and time.

However, as mentioned above, with such a movement, the speed of the machine base 2 and the material feeding speed cannot be synchronized, so the disc crank 1
It is necessary to make the rotation of No. 5 a predetermined variable speed rotation and move the machine base 2 at a constant speed in a predetermined section of the forward stroke.

This problem can be easily solved, for example, by using the control device described above.

The cutting of the pipe material P to be cut by the two rotary blades 7 and 8 is performed by the rotary blade 7.
, 8 themselves reciprocate in response to the reciprocating movement of the machine base 2 at the predetermined time points.

First, as shown in FIG. 2, the notch rotary blade 7 notches the upper part of the cutting position of the pipe material P to be cut into a groove shape, and immediately after that, as shown in the same figure, the cutting blade The rotary blade 8 cuts the pipe material P.

The rotational driving force of both rotating blades 7 and 8 is provided by a spline shaft 9.
, 9 while allowing its axial sliding.

Thereafter, the fixing mechanism becomes released, the speed of the machine platform 2 decreases, and then it begins a go-around stroke.

After the middle of the backward stroke, the above-mentioned operations will be performed in the same way.

That is, by repeating the above cycle, the pipe material P to be cut is continuously cut.

To briefly describe the process of transition to the subsequent cycle, the fixing mechanism is released and the machine base 2 drops below the synchronized speed, and then goes through the homeward stroke and then returns to the aforementioned synchronized speed in the next forward stroke. The pipe material P to be cut continues to protrude in front of the fixing mechanism until the speed reaches the synchronized speed, and when the synchronous speed is reached, the pipe material P to be cut protrudes for a predetermined length.

In the above, both rotating blades 7 and 8 are connected to spline shafts 9 and 9.
Since they are rotated in opposite directions while maintaining the above-mentioned predetermined relationship, immediately after the notch rotary blade 7 makes a notch in the upper part of the pipe material P to be cut, the cutting rotary blade 8 cuts at that position. Even in this case, the two rotary blades 7 and 8 do not interfere with each other, and the rotation speed, that is, the cutting speed can be increased.

In addition, since the rotational driving force for both rotary blades 7, 8 is applied by spline shafts 9, 9, the machine base 2
It is possible to transmit sufficient driving force while smoothly following the reciprocating motion of the

Furthermore, as shown in FIG. 2 and described above, this mechanism is designed to notch the upper part of the pipe material P to be cut using the notch rotary blade 7, and then to cut the pipe material P at the notch position using the cutting rotary blade 8. Therefore, no dimples will be formed at the cut end of the tube material.

Furthermore, a simple crank mechanism is adopted as the reciprocating drive mechanism of the machine base 2, and the spline shafts 9, 9 and the disc crank 15 are used.
The rotary drive body 21 to be connected to the drive shaft 18 of the rotary shaft 18 can be easily shared via a gear train, etc., and since it does not have a structure in which a clutch is interposed, even higher speed cutting is possible. It is.

Therefore, as understood from the description of the embodiments above, the present invention can sufficiently achieve the intended purpose.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view of the upper part of the machine, FIG. 2 is an explanatory diagram showing the relationship between the notch cutting rotary blade and the cutting rotary blade, and FIG. The figure is a partially cutaway side view of the machine base, FIG. 4 is a schematic side view of the whole, FIG. 5 is a schematic front view of the whole, and FIG. 6 is a schematic plan view of the whole. 1... Guide shaft, 2... Machine base, 3
, 17...Bracket, 4...Return spring, 5...Imovable fixed part, 6...
...Movable fixed part, 7...Rotary blade for notch, 8...
...Rotary cutting blade, 9...Spline shaft, 10...Frame, 11...L
Shape arm, 12...cam, 13...
Roller 14... Pressing body, 15... Disc crank, 16... Connecting rod, 1
8... Drive shaft, 19... Joint, 20.
... External frame, 21 ... Rotation drive body, 22 ... Bearing, 23, 24, 28, 29 ...
... Gear, 25 ... Intermediate shaft, 26, 27.
...Bebergya.

Claims (1)

[Claims] 1. A guide member for guiding the machine, a crank, and
A reciprocating drive mechanism consisting of a crank and a connecting rod with both ends pin-coupled to the machine base is installed, and the machine base is equipped with a rotating notch for notching the upper part of the pipe material to be cut that is fed on the material feed line. Immediately after notching the blade and the pipe material to be cut, a cutting rotary blade that cuts the notch position is arranged, and rotational driving force is transmitted to both of the rotary blades while allowing reciprocating motion corresponding to the reciprocating motion of the machine base. A spline shaft or a shaft with a sliding key is provided, and the crank of the reciprocating drive mechanism and the spline shaft or the shaft with a sliding key are connected to the same rotary drive body via a detachable gear train. Pipe material cutting equipment.