JPH0643007B2 - Cutting device - Google Patents

Description

The present invention relates to a cutting device, and more particularly to a cutting device that slides a tool attached to the end face of a spindle.

[Prior Art] Conventionally, a cutting tool is attached to an end surface of a rotating spindle to cut a pipe or the like. As an apparatus for performing such processing, for example, as shown in FIG. 4 and FIG.
A rotary plate 72 is attached to the end face of 0, and sliding bases 74, 7 supported by the rotary plate 72 slidably in the radial direction of the main shaft 70.
5 is provided. Cutting tools 76 and 77 are rotatably supported on the front sides of the slides 74 and 75, and
Tapered portions 78 and 79 are formed on the rear side.

A taper hole 82 on the inner circumference of a taper sleeve 80, which is slidably supported in the axial direction, is in contact with the taper portions 78 and 79, and a circular groove 84 is formed on the outer circumference of the taper sleeve 80. . Rollers 86 and 87 are fitted into the circular groove 84, and the rollers 86 and 87 are rotatably supported by a swing member 90 that is swingably supported by a main body 88. A rod of a hydraulic cylinder 92 is connected to the swing member 90.

When the main shaft 70 is rotated, the slide table 7 is rotated together with the rotary plate 72.
4, 75 and cutting tools 76, 77 revolve around a pipe W provided coaxially with the main shaft 70. Then, the hydraulic cylinder 92 is driven to swing the swinging member 90 to slide the taper sleeve 80 in the axial direction. As a result, the slide base 74, the slide base 74, 79
75 slides toward the pipe W, and cutting tools 76, 77
There has been known a device for pressing the pipe W to cut it.

[Problems to be Solved by the Invention] However, in such a conventional cutting device, the slides 74 and 75 rotate together with the main shaft 70.
Centrifugal force acts on 75. Therefore, the slides 74, 75
In order to slide the shaft toward the center of the main shaft 70, it was necessary to overcome the centrifugal force and slide. In particular, when the main shaft 70 is rotated at a high speed, the centrifugal force increases, and the sliding base 7
There was a problem that the responsiveness of 4,75 was impaired. Therefore, the present invention has been made to solve the above-mentioned problems, and has been made to provide a cutting device with improved responsiveness of a sliding base.

Structure of the Invention [Means for Solving Problems] In order to achieve the above object, the present invention has the following structures as means for solving the problems. That is, a slide base that is slidably supported in a radial direction of the main shaft by a rotary plate that is attached to a main shaft that is rotatably supported, and a disk cutter that is rotatably supported by the slide base. In a cutting device comprising: a drive mechanism for driving the slide base toward a pipe fixed coaxially with the main shaft to cut the pipe by the disc-shaped cutter, the rotating plate has a diameter of the main shaft. A slide weight that is slidably supported in the same direction as the slide table, and is rotatably provided on the rotary plate about an axis parallel to the axial direction of the main shaft, and both ends of the slide weight are slidable. A cutting device is characterized in that it comprises a table and a lever fitted to the sliding weight so that the sliding directions thereof are opposite to each other.

[Operation] In the cutting device of the present invention having the above-described configuration, the rotary plate rotates with the rotation of the main shaft, and the sliding base and the sliding weight rotate with the rotation of the rotary plate, and the centrifugal force acts. The centrifugal forces generated on the slide base and the slide weight act in the opposite directions because the levers are inserted and inserted in the opposite directions. Therefore, the drive mechanism can quickly slide the slide base with a slight force, and the pipe is cut by the disk cutter rotatably supported by the slide base.

Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a front view of a cutting device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a rear view of the present cutting device. As shown in FIG. 1 and FIG. 2, this cutting device is assembled on the base of the main body 1 and is provided with two pieces for cutting by swinging around a pipe W fixed coaxially with a main shaft 22 described later. Disc type cutters 2 and 3 and 2 type slide units 8 and 10 that rotatably support and slide the disc type cutters 2 and 3 with cutter pins 4 and 6, respectively. Of the rotary plate 12, which are arranged to face each other and slidably supported in the radial direction, two levers 14 and 16 having a dogleg shape, which are rotatably provided on the rotary plate 12, and are arranged on the rotary plate 12. It is composed of two sliding weights 18, 20 and the like, which are arranged to face each other and are slidably supported in the radial direction.
Further, a main shaft 22 rotatably supported by the main body 1 bolted to the rotary plate 12, a cam shaft 24 which is mounted on the main shaft 22 and rotatably supported by the main body 1, the main shaft 22 and the cam shaft 2
A drive device 26 and the like for driving each of the four are also provided.

Here, the main body 1 is a hollow nose 1a that rotatably supports a main shaft 22 and houses a pipe W, a housing 1b to which the nose 1a is fixed and a drive device 26 and the like are mounted, and a front surface of the housing 1b is mounted. It is composed of a face plate 1c.

Also, cam followers 28,
The cam followers 28 and 30 are engaged with the cam shaft 24 through the through holes 12 a formed in the rotary plate 12. On one surface of the rotary plate 12, a groove 12b forming a square slide is formed in a "+" shape,
The slides 8 and 10 and the slide weights 18 and
20 is fitted. Further, fan-shaped pressing plates 31, 32, 33, 34 for preventing the slides 8, 10 and the sliding weights 18, 20 from rising are fixed to the rotary plate 12.

Here, the weights of the sliding weights 18 and 20 are almost equal to the weights of the sliding bases 8 and 10, and the positions of the centers of gravity of the sliding weights 18 and 20 are equidistant from the center of rotation before the start of cutting. Also,
These slide bases 8 and 10 and slide weights 18 and 20 are connected by levers 14 and 16. This is lever 1
Both ends of 4, 16 are sliding bases 8, 10 and sliding weight 1 respectively.
It is carried out by being inserted into 8 and 20. As a result, when the main shaft 22 and the cam shaft 24 are rotated at the same number of revolutions, the centrifugal forces generated in the sliding bases 8 and 10 and the sliding weights 18 and 20 are balanced, and the sliding bases 8 and 10 are slightly moved. Sliding is started by applying an appropriate force.

Two cam grooves 24a and 24b forming a cam curve are formed on the end surface of the cam shaft 24. The cam grooves 24a and 24b are formed.
Is formed in an arc shape with a rectangular cross section and a semi-circle, and the distance from the center of rotation to the cam grooves 24a, 24b becomes shorter as it goes counterclockwise along the cam grooves. As a result, the cam shaft 24
Is rotated relative to the main shaft 22 to the right, the cam shaft 24
The slide bases 8 and 10 slide toward the center of rotation through the cam followers 28 and 30 inserted in the a and 24b.

The drive device 26 is, as shown in FIGS. 2 and 3, an AC for the spindle.
A servo motor 36 and a cam shaft AC servo motor 38 are provided as power sources, and a main shaft motor pulley 39 and a cam shaft motor pulley 40, which are provided on the rotating shafts of the AC servo motors 36 and 38, respectively, through a main shaft 22 and a cam. It is configured to transmit power to the shaft 24. For driving the main shaft 22,
The drive device 26 includes a main shaft gear 41 that meshes with a gear 22 a formed on the outer periphery of the end of the main shaft 22, and a main shaft transmission shaft 4 rotatably supported by the main body 1 key-connected to the main shaft gear 41.
2, a main shaft pulley 44 attached to one end of the main shaft transmission shaft 42, a timing belt 46 stretched between the main shaft pulley 44 and the main shaft motor pulley 39, and the like. As a result, when the main shaft AC servomotor 36 rotates, the main shaft 22 is rotated via the timing belt 46, the main shaft gear 41, and the like. Further, for driving the cam shaft 24, the drive device 26 is rotatably supported by the main body 1 by being key-connected to the cam shaft gear 50 that meshes with the gear 24a formed on the outer periphery of the end of the cam shaft 24 and the cam shaft gear 50. The camshaft transmission shaft 52, the camshaft pulley 54 attached to one end of the camshaft transmission shaft 52, the timing belt 56 stretched between the camshaft pulley 54 and the camshaft motor pulley 40, and the like. It is equipped. As a result, when the AC servomotor 38 for the camshaft rotates, the camshaft 24 rotates via the timing belt 55, the camshaft gear 50, and the like.

In the cutting device of the present embodiment having the above configuration, first, the main shaft 22 and the cam shaft 24 are rotated at the same rotational speed by the two main shafts and the cam shaft AC servomotors 36 and 38. At this time, since there is no relative rotation difference between the main shaft 22 and the cam shaft 24, the slide bases 8 and 10 do not slide. Next, when the rotational speed of the AC servo motor 38 for the cam shaft is increased, the main shaft 22 and the cam shaft 2
A relative rotation difference occurs between the sliding bases 8 and 10 and the sliding bases 8 and 10 slide toward the center of the main shaft 22 by the cam grooves 24a and 24b. At this time, the centrifugal force acting on the slides 8 and 10 is
Since it is balanced with the centrifugal force acting on the sliding weights 18 and 20, the sliding bases 8 and 10 start sliding with a slight force. When the slides 8 and 10 slide toward the pipe W and the pipe W is cut by the disk-shaped cutters 2 and 3, the rotation speed of the AC servo motor 38 for the cam shaft rotates the AC servo motor 36 for the main shaft. Lower than the main shaft 22 and cam shaft 2
4, a relative rotation difference occurs, and the slides 8 and 10 are slid in the direction away from the pipe W by the cam grooves 24a and 24b. When the slides 8 and 10 return to the position before the start of cutting, 2
The rotation speeds of the AC servo motors 36, 38 of the base are rotated at the same speed, and the sliding of the slide bases 8, 10 is stopped.

As described above, according to the cutting apparatus of this embodiment, the sliding weight 1
By balancing the centrifugal force acting on the sliding tables 8 and 20 with the centrifugal force acting on the sliding platforms 8 and 10, the force for starting the sliding of the sliding platforms 8 and 10 can be reduced, and the sliding platform 8, 1
0 can be slid with good responsiveness. Further, since the force for starting the sliding may be small, the capacity of the AC servomotor 38 for the camshaft can be reduced and the power consumption can be reduced. Further, since the centrifugal force is canceled even when the slide bases 8 and 10 are slid, the power consumed during the slide is small.

According to this embodiment, two slides 8 and 10 and two slide weights 18 and 20 are arranged to face each other, and both slides 8 and 10 slide toward the center. Since it moves, the wheel balance is not lost by sliding.

Although the embodiments of the present invention have been described above, the present invention is not limited to such embodiments, and it goes without saying that the present invention can be implemented in various modes without departing from the scope of the present invention.

EFFECTS OF THE INVENTION As described in detail above, according to the cutting device of the present invention, the centrifugal force acting on the moving weight and the centrifugal force acting on the slide base are acted via the connecting mechanism, so that the sliding base slides. The effect that the force for starting the movement can be reduced, and the slide base can be slid with good response. Also,
The force for starting the sliding may be small, the driving force of the driving mechanism can be reduced, and the energy consumed can be reduced. Furthermore, since the centrifugal force is canceled even when the slide base slides, less energy is consumed during the slide. Since the slide base is driven by the drive mechanism, the sliding speed and sliding amount of the slide base can be controlled separately from the rotation of the main spindle, and the cutting conditions for the main spindle rotation speed and sliding speed can be individually controlled. Can be set to. Moreover, since the pipe can be fed in the axial direction according to the cutting length and continuously cut one after another, the takt time can be shortened.

[Brief description of drawings]

FIG. 1 is a front view of a cutting device showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a rear view of the present cutting device, and FIG. FIG. 5 is a side view of the main part of the apparatus, and FIG. 8, 10 ...... Sliding base 12 ...... Rotating plate 14, 16 ...... Lever 18, 20 ...... Sliding weight 22 ...... Main shaft 24 ...... Cam shaft 26 ...... Drive device

Claims (1)

[Claims] 1. A slide table slidably supported in a radial direction of the spindle on a rotary plate mounted on a spindle rotatably supported, and a disk type rotatably supported by the slide table. A cutter, and a drive mechanism for driving the slide table toward a pipe fixed coaxially with the main shaft to cut the pipe by the disc-shaped cutter, wherein A sliding weight that is slidably supported in the radial direction of the main shaft and has a weight almost equal to that of the slide table, and a rotary plate that is rotatably provided around an axis parallel to the axial direction of the main shaft and has both ends thereof. A cutting device comprising: a lever fitted into the sliding base and the sliding weight such that the sliding directions thereof are opposite to each other.