JPS6268219A - Pipe cutting machine - Google Patents

Abstract

PURPOSE:To cut a pipe, even if it is in thin thickness, with no generation of chattering while no break of a round cutter, by providing a spreading core, inserted into a pipe end, in a pipe end supporting mechanism and giving rigidity from the inside to the pipe when it is cut. CONSTITUTION:A spindle mechanism 3 inserts a pipe P to be chucked by a chuck 2 and rotated. A supporting mechanism 4 inserts its spreading core 18 into the other end part of the pipe. The spreading core 18 is supported to a moving bed 15, and a machine, leftward moving a tapered shaft 24 by a cylinder 19 so as to spread a part piece 22 to be opened and forcing its external surfaces 22A, 22B to be attached to an internal surface of the pipe, gives rigidity to the pipe. Under this condition, the machine cuts the pipe by a circular cutter 5 with no generation of a chatter.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pipe cutting device that cuts pipe material using a round blade cutter.

[Prior art and its problems]

G7I cutting devices have been used in various practical applications for cutting pipes, but they are used only when the pipe material is thin and has a relatively large diameter (10
0φ front V is known to get caught in the blade and damage it. Therefore, conventionally, 3 to 2
The cutter is equipped with two cutters that simultaneously cut the pipe material from different directions to prevent the blade from being damaged by the cut ends of the cut pipe material.

However, in a cutting vIT device that uses multiple cutters, multiple cutters are arranged around the pipe material, and these cutters must be fed equally, resulting in a complex and large-sized cutting device structure, resulting in an increase in cost. It also has the disadvantage of being expensive.

[Purpose of the invention]

In view of this, the present invention aims to simplify and downsize the structure of the device by using a single round blade cutter, and furthermore, there is no tip entanglement at the end of cutting, and there is no damage to the blade (cutting). The purpose was to provide a pipe cutting device.

[Structure of the invention]

In order to achieve the above object, a cutting device according to the present invention includes a spindle mechanism equipped with a chuck that inserts the pipe material to be cut and rotates it, and a pipe end support mechanism that rotationally supports the end of the pipe material. and these spindle If
A cutter mechanism having a round blade cutter is provided between the chuck of b'8 and the pipe end support mechanism, and the pipe end support RM4 is inserted into the pipe end and expands to cut the pipe material. It is characterized by having an expanded core that is crimped onto the inner surface.

(Embodiments of the invention) The present invention will be described below with reference to embodiments shown in the drawings.

A spindle mechanism 3 provided on a base 1 with a chuck 2 that inserts the pipe UP and rotates it, a pipe end support mechanism 4 that rotationally supports the end of the pipe material P, and these spindle mechanisms 3. A cutter mechanism 6 is provided between the chuck 2 and the pipe end support mechanism 4. The cutter mechanism 6 has a round blade cutter 5 that is movable forward and backward in a direction perpendicular to the axis of the pipe material P.

The spindle structure 3 includes a spindle 9 rotatably supported by a support 7 fixed to the base 1 via bearings 8, 8, and a pulley 1 fixed to one end of the spindle 9.
A belt 13 is wound around the pulley 12 of the drive motor 11 and the drive motor 11, and the spindle 9 is rotated by the drive of the motor 11. Further, a chuck 2 is fixed to the other end of the spindle 9, and is configured to clamp and fix a pipe material P to be cut, which is inserted into the axial hole of the spindle 9.

On the other hand, the pipe end support mechanism 4 includes a moving table 15 mounted movably on the base 1 in the axial direction of the pipe material P by a dimension setting hydraulic cylinder 14, and a bearing 16 on the moving table 15.
A hollow shaft member 17 rotatably inserted and supported via 16
An expansion core 18 similar to a collet chuck structure connected to the end of the hollow shaft member 17 on the spindle mechanism 3 side and inserted from the end of the pipe material P, and a hydraulic cylinder 19 for expanding and contracting the expansion core 18. A removal plate 20 for removing the cut remaining pipe material P' is fitted to the base of the expanded core 18 at a position where the end of the pipe material P hits. Hydraulic cylinder 2
1 Rondo 21A is connected.

The expansion core 18 is divided into 3 to 4 pieces 2 along the axial direction.
2, 22..., and has a tapered surface portion 23 inside, and the taper @24 at the tip of the rod 19Δ of the hydraulic cylinder 19 is opposed to the tapered surface portion 23,
When the taper shaft 24 moves forward (to the left in the figure) by driving the hydraulic cylinder 19, the pieces 22, 22... are expanded so that their outer surfaces 22A are pressed against the inner surface of the pipe material P. There is.

The outer peripheral shape of the expanded core 18 is the base outer peripheral surface 2213
has a dimension that matches the inner diameter of the pipe material P, and the tip outer circumferential surface 22A has a smaller diameter dimension than that of the tapered shaft 24.
When the pieces 22, 22... are expanded by the advancement of the pipe material P, they are pressed against the inner surface of the pipe material P. The expansion core 18 is attached to the flange 17 at the end of the hollow shaft 17.
A holding member 25, which can be fixed to A with a bolt or the like, engages with and presses the flange 22C at the proximal end of the expansion core 18, thereby fixing it. Note that this expanded core 18 can be configured to be divided in the axial direction depending on the cutting length of the pipe material P, and can be adapted to the cutting length of the pipe material P by changing the tip end side.

The cutter mechanism 6 includes a motor 26, a round blade cutter 5 fixed to a shaft rotated by the motor 26, and a hydraulic cylinder 2 that moves the cutter 5 toward and away from the pipe material P.
7, this round blade cutter 5 is located between the chuck 2 of the spindle mechanism 3 and the tip of the expanded core 18 of the pipe end support mechanism 4, and is configured to cut the pipe material P by the operation of the hydraulic cylinder 27. It is designed to cut to a predetermined cutting depth.

Next, the operation of the above embodiment will be explained.

When cutting the pipe material P, move the tapered shaft 24 of the expanded core 18 back to the right in the figure, and
143, the pipe material P is attached to the spindle 9 from the left side.
is inserted, and the distal end of the pipe material P in the insertion direction is fitted onto the expansion core 18 and abuts against the exclusion plate 20. This determines the cutting position of the pipe material P. The cutting position is adjusted by adjusting the movable table 15 of the pipe end support mechanism 4 by operating the cylinder 14.

Next, the chuck 2 is tightened, and the hydraulic cylinder 19 of the expansion core 18 is driven to move the tapered shaft 24 forward to the left in the figure, so that the tapered shaft 24 is pressed against the tapered surface 23 of the pieces 22, 22, and so on. The pieces 22, 22, .

After this, the motor 911 of the spindle mechanism 3 is driven,
While rotating the spindle 9, the cutter moves the horizontal 6 in the direction of the pipe material P, and the round blade cutter 5 cuts the pipe material P.
Cut in. During this cutting, the pipe material P rotates slowly together with the expanded core 18, and the cutting is completed when the pipe material P rotates once.

In this case, the cutting part of the pipe material P is supported from inside by the expanded core 18 in its immediate vicinity, and the other side is supported from the outer circumferential side by the tip 2, so even if the pipe material P is thin, the rigidity is high. The cut end of the pipe material does not become entangled with the blade of the round blade cutter 5 even at the end of cutting.
The cutting can be finished cleanly and the blade of the round blade cutter 5 will not be damaged.

After cutting, the movable table 15 of the pipe end support mechanism 4 is moved back, and the tapered shaft 24 is moved back to move the expanded core 1.
8 is reduced in diameter and the hydraulic cylinder 21 is operated to remove the exclusion plate 20.
By moving to the left in the figure, the cut pipe material P' is removed from the expanded core 18.

By repeating the same operation thereafter, the pipe material P can be cut to a fixed size.

In the illustrated embodiment, a case is explained in which hydraulic cylinders are used as means for moving each part, but cylinders other than hydraulics, screw feed, or other means may be used.

〔Effect of the invention〕

As explained above, the pipe cutting device according to the present invention has the following features:
A spindle mechanism equipped with a chuck that inserts the pipe material to be cut and rotates it, a pipe end support mechanism that rotationally supports the end of the pipe material, and a chuck and pipe end support hoe mechanism for these spindle mechanisms. and a cutter mechanism having a round blade cutter movably disposed between the pipe end support mechanism and the pipe end support mechanism, the pipe end support mechanism including an expansion core that can be inserted into the pipe end, expanded, and crimped against the inner surface of the pipe material. When cutting, the end side of the pipe material is supported from inside by an expanded core, so even if the pipe material to be cut is thin and large in diameter, it can be cut without causing any distortion. Even when cutting with a single round blade cutter, the cut end of the pipe material does not become entangled with the blade at the end of cutting, and there is no risk of the blade being exploded. Therefore, even a single round blade cutter can perform good cutting, so there is no need to equip the conventional multiple cutters, which simplifies the configuration of the device and allows it to be made smaller. It has various excellent effects.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view showing an embodiment of a pipe cutting device according to the present invention, Fig. 2 is an enlarged sectional view of the expanded core portion of the pipe end support mechanism in Fig. 1, and Fig. 3 is a pipe material and a round blade. FIG. 3 is an explanatory diagram showing the relationship with a cutter. 1... Base, 2... Chuck, 3... Spindle mechanism side, 4... Pipe end support mechanism, 5... Round blade cutter, 6... Cutter mechanism, 7... Support Stand, 8, 16・
...Bearing, 9...Spindle, 11.26...Motor, 10.12...Pulley, 13...Belt, 1
4.19, 21.27... Hydraulic cylinder, 15...
Moving table, 1A...Hollow shaft, 18...Expansion core, 20.
... Exclusion plate, 22 ... Piece, 23 ... Tapered surface,
24... Tapered shaft, 25... Pressing member. 1) 1 (December 1960 / 7E+ 17f Correction Agency Director Uga Tsurubu-dono 1 '11 Display 1) (160 years Patent Application No. 207106 2 Name of the invention Pipe Cutting device 311■Relationship with the case if corrected 1 Temple 3'"Detailedexplanation" column. 8 Contents of the amendment Insert the following in the third line of page 9 of the tIAs for this application after "Others may be used.""Also, when cutting, the pipe material is When rotating, the pipe supporting mechanism 4 vertically rotates, but the shaft 17 of the supporting mechanism 4 may be rotated in synchronization with the spindle mechanism 3.j

Claims (1)

[Claims] A spindle mechanism equipped with a chuck that inserts a pipe material to be cut and rotates it, a pipe end support mechanism that rotationally supports the end of the pipe material, and a chuck of these spindle mechanisms and a pipe end support mechanism. and a cutter mechanism having a round-blade cutter movably disposed between the pipe end support mechanism and the pipe end support mechanism including an expansion core that can be inserted into the pipe end, expanded, and crimped against the inner surface of the pipe material. A pipe cutting device featuring: