JPH04101718A - Cutting and device for cutting pipe into several pieces at once - Google Patents

Abstract

PURPOSE:To provide efficient cutting by cutting a pipe raw material where plural cutting tools supported so that their rotation can be driven are held at a bore chuck mechanism, by the amount of pipe wall thickness. CONSTITUTION:In cutting a pipe raw material P0, when a bore chuck mechanism 10 is covered with the pipe raw material P0 and a holding jaw 16 is protruded from a body 15 by driving a core 19, the approximately whole pipe raw material P0 is chucked uniformly. Cutting is performed by cutting plural rotating cutting tools by the amount of pipe wall thickness. The whole periphery of the pipe raw material P0 comes into contact with both parts of up-cut ranging from the outside diameter side of the tool to inside diameter side of the tool. The burrs generated by down-cutting are removed by up-cutting and the burrs generated by up-cutting are removed by down-cutting respectively, so it is possible to prevent burrs from occurring on a cutting edge pulling side.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for cutting multiple pipes.

[Prior Art] When cutting a workpiece such as a pipe using a rotating tool, the cutting is usually performed by cutting into the workpiece from a certain direction and passing the cut portion of the workpiece through the tool. in this case.

On one side of the workpiece, a down cut is performed by the tool blade entering from the outer diameter side to the inner diameter side, and on the other side of the workpiece, an up cut is performed by the tool blade exiting from the inner diameter side to the outer diameter side. is performed, and when the tool is removed on each side, a gap occurs on the side. Therefore, deburring or post-processing is required after cutting. Particularly, when cutting is performed while supporting one end of the workpiece, when the cut portion is cut off just before the cutting is finished, something equivalent to a break or uncut portion is generated.

In addition, with normal cutting machines, the amount of displacement is large because the tool must cut by the diameter of the workpiece, and in addition, in one workpiece cutting operation, the necessary length is cut from one piece of material one by one. It is customary to obtain only
There is also the problem of large space and time losses.

[Problems to be Solved by the Invention] The technical problem of the present invention is to prevent the occurrence of burrs on the side of the inserted blade when cutting pipes, thereby eliminating the need for burr removal and post-processing. (Moreover, it is an object of the present invention to provide a pipe cutting method and an apparatus thereof that can cut one pipe material at a plurality of locations simultaneously and with a small depth of cut using a tool, thereby enabling efficient cutting.

[Means for Solving the Problems] The pipe cutting method of the present invention for solving the above problems includes:
A pipe material to be cut is attached and chucked to an inner diameter chuck mechanism that evenly chucks the inner diameter of the pipe material over almost the entire cutting area, and the pipe material is rotated around its axis together with the inner diameter chuck mechanism, A plurality of cutting tools arranged at required intervals are cut in the direction perpendicular to the axis of the pipe material by the thickness of the pipe.
Cutting is finished when the pipe material has rotated at least once, and then the chucking of the pipe by the inner diameter chuck mechanism is loosened to take out the pipe, thereby simultaneously cutting multiple pipes from one pipe material. It is characterized by:

Further, the pipe cutting device of the present invention includes an inner diameter chuck mechanism for attaching and chucking a pipe material on the machine frame, and a cutting mechanism for cutting the pipe material held by the inner diameter chuck mechanism. , the above-mentioned inner diameter chuck mechanism has a cylindrical chuck body rotatably supported on the machine frame,
It is constructed by uniformly distributing retaining claws that appear and retract as a result of the drive of the core metal inserted into the chuck body,
The above-mentioned cutting mechanism is characterized in that a number of cutting tools are rotatably supported at required intervals, and these tools are capable of cutting into the pipe material held by the inner diameter chuck mechanism by the thickness of the pipe. It is.

[Function] When cutting pipe material, if the pipe material is attached to the inner diameter chuck mechanism and the holding claw is protruded from the cylindrical chuck body by driving the core metal, the pipe material is chucked almost entirely evenly. be done. Cutting is performed by rotating the pipe material around its axis and using a plurality of rotating cutting tools to cut into the pipe by the thickness of the pipe. For this reason, the pipe material comes into contact with both the down cut part that enters the tool from the outer diameter side to the inner diameter side and the up cut part that exits from the inner diameter side to the outer diameter side, all around the pipe material. For this reason, the burr generated in the down cut is removed by the up cut, and the burr generated in the up cut is removed by the down cut, thereby preventing the burr from occurring on the side of the blade. Moreover, since the pipe material is chucked and cut almost evenly over the entire pipe material, when the cut part is cut off just before the cutting is finished, there is no breakage or uncut material, and a single piece of material is cut. A pipe material can be cut simultaneously at a plurality of locations with a small depth of cut without causing any burr, and efficient cutting can be performed.

[Examples] Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an inner diameter chuck mechanism that constitutes the main part of a pipe cutting device according to the present invention, and FIGS. 2 and 3 show the overall structure of the pipe cutting device.

The inner diameter chuck mechanism IO is inserted into the pipe material P0 and evenly chucks almost the entire cutting area of the pipe material. This inner diameter chuck mechanism lO
A rotary sleeve 14 is rotatably supported by a bearing 13.13 inside the support 11 and presser cover 12, which are attached to the machine frame l of the pipe cutting device.A cylindrical chuck body 15 is fixed to the rotary sleeve 14. protrudes from the presser cover 12 to the outside.

The chuck main body 15 has a large number of openings evenly spaced around the entire length of the chuck body 15 through which the holding claws 16 enter and exit.The holding claws 16 made of synthetic resin or the like are fitted into these openings, and An elastic band 17 is fitted into a groove provided on the outer surface of the chuck 16, and the contraction force of the elastic band 17 causes the holding claws 16 to sink into the chuck body 15. Further, the inner surface 18 of each holding claw 16 is a tapered surface, and a large number of tapered surfaces 20 are provided on the surface of the core bar 19 inserted into the chuck body 15 in contact with these tapered surfaces. This core metal 19 is driven in the axial direction by a rod 22 of a cylinder 21 attached to the support body 11, and when the core metal 19 is pushed into the chuck body 15 by the rod 22 from the state shown in FIG. The retaining claws 16 open outward evenly (thus.

When the pipe material P0 is fitted onto the outer periphery of the chuck body 15, it is chucked. When the core bar 19 is moved backward by the cylinder 21, the holding claw 16 is returned to the center of the chuck body 15 by the contraction force of the elastic band 17.

A gear 24 for rotationally driving the chuck body 15 is attached to the rotating sleeve 14. The rotation of the gear 24 is also transmitted from the chuck body 15 to the holding claws 16 and the core metal 19. The core metal 19 and the rod 22 of the cylinder 21 are connected by a joint 25 that transmits axial force but not rotation. Therefore, only the axial force is transmitted between the core metal 19 and the rod 22 of the cylinder 21, and the rotation of the core metal 19 is not transmitted to the rod 22.

As shown in FIGS. 2 and 3, 1. The pipe cutting device equipped with the above-mentioned inner diameter chuck mechanism 1O on the machine frame 1 is equipped with a cutting mechanism 30 for cutting the pipe material P0 held by the inner diameter chuck mechanism 1O.

As shown in FIG. 4, this cutting mechanism 30 has a large number of cutting tools (metal saws) 33 mounted at required intervals on the tips of arms 32 that are rotatably supported by a pair of left and right support shafts 31 and 31, respectively. The arm 32 is rotatably supported and a feed arm 34 is attached to the arm 32. Left and right arm 3
The cutting tools 33.33 installed on
The two tools 33 and 33 are arranged so that the pipe material Pa is cut at required intervals by the action of both tools 33 and 33.

These tools are driven via a belt 37 from a pulley 36 on a support shaft 31 which is rotationally driven by a motor 2 attached to the machine frame 1 via an appropriate power transmission mechanism. Further, the feed arm 34 is tilted by the action of a cam 38 shown in FIGS. 2 and 3, whereby the cutting tool 33 is held by the inner diameter chuck mechanism IO. However, the depth of the cut is limited to the thickness of the pipe by a stopper or the like that abuts the arm 32 or the feed arm 34.

In FIGS. 2 and 3, the inner diameter chuck mechanism 10
is supported by a slide unit 40 so as to be slidable in the axial direction. This slide unit 40 is mounted on a guide rod 42 installed between a machine frame l and a slide base 41 attached to the machine frame l in a protruding state.
The inner diameter chuck mechanism 10 is slidably supported by the slide unit 40 as follows.
As will be described later, this is operated when taking out the cut pipe P from the inner diameter chuck mechanism 10 (see FIG. 5).

The gear 24 of the inner diameter chuck mechanism 1O is driven by the motor 3 on the machine frame 1 via an appropriate power transmission mechanism. However, in this power transmission mechanism, when the inner diameter chuck mechanism lO is sent to the cutting position in the machine frame l by the slide unit 40, the inner diameter chuck mechanism lO
Another gear driven by the motor 3 is meshed with the gear 24, so that the gear 24 can be rotated.

Pipe material P attached to the above-mentioned inner diameter chuck mechanism lO
. is supplied through an outer diameter chuck mechanism 5 installed on the machine frame 1 as required. This outer diameter chuck mechanism 5
The pipe material P is prepared by appropriate well-known means. configured to chuck the outer surface of the

The outer diameter chuck mechanism 5 is made of pipe material P. When cutting the
The pipe material P held thereby. must be rotated in synchronization with the rotation of the inner diameter chuck mechanism IO. Therefore, the same motor 3 as the inner diameter chuck mechanism 1O is used to drive the rotation of the outer diameter chuck mechanism 5, and the rotation speeds of both chuck mechanisms are completely synchronized by gears or the like.

As shown in FIG. 5, the cut pipe P is removed by retracting the inner diameter chuck mechanism IO using the slide unit 40.
As a result, the chuck body 15 is pulled out from the pipes P, and the pipes P are dropped downward. This fallen pipe P is appropriately carried out of the machine by a conveyor.

Incidentally, since pipe cutting with the above-mentioned cutting device is normally performed in a wet manner, an oil tank 6 and a cutting oil pump 7 are installed in the machine frame l, as shown in Figs. 2 and 3. Oil is supplied.

In the pipe cutting device having the above configuration, in order to cut the pipe material P0, first, the cylinder 21 is driven to push the core bar 19 in the inner diameter chuck mechanism lO into the chuck body 15, and the holding claws 16 are moved into the chuck body 15. By protruding from the opening, the inner diameter of the pipe material P0 is evenly chucked over almost the entire cutting area.

After the pipe material is attached and chucked to the inner chuck mechanism 1O in this manner, the feed arm 34 is tilted by driving the cam 38 while rotating the pipe material together with the inner diameter chuck mechanism 1O around its axis. A plurality of cutting tools 33 arranged at required intervals are cut into the pipe by the thickness thereof in a direction perpendicular to the axis of the pipe material.

When the pipe material P0 attached to the inner diameter chuck mechanism 10 has rotated at least once, the cutting is finished, and then the chucking of the pipe by the inner diameter chuck mechanism 10 is loosened, and the cut pipe P is taken out. As a result, a plurality of pipes are simultaneously cut from one pipe material P0.

Such a pipe material P. In cutting, the plurality of cutting tools 33 are cut by the wall thickness of the pipe while rotating the pipe material Po around its axis, so it is possible to prevent the occurrence of burr on the side where the blade is removed. . That is, the sixth
As shown in the figure, the blade of the rotating tool 33 cuts into the pipe material P0 in an example 33a of the cutting portion into the pipe material P0. The pipe material P0 enters a down cut from the outer diameter side to the inner diameter side, and on the opposite side 33b, the pipe material P0 enters an up cut from the inner diameter side to the outer diameter side, but due to the rotation of the pipe material P0, the tool 33 is Since it contacts both the down cut part and the up cut part, the paris generated in the down cut will be removed by the up cut, and the paris generated in the up cut will be removed by the down cut, and these paris will remain after cutting. will be prevented as much as possible.

Moreover, the pipe material P. Since the entire pipe is chucked and cut almost evenly, even when the cut portion is cut off after cutting, each cut pipe P is held in the inner diameter chuck mechanism IO, and therefore What corresponds to burrs and uncut parts is not generated, and one pipe material P0 can be cut at multiple locations simultaneously without burrs, and efficient cutting can be performed.

Furthermore, the depth of cut of the tool is determined according to the wall thickness of the pipe material P0, regardless of its diameter, and the rotation speed of the pipe material Pa is also constant regardless of the diameter, so the cutting time is determined by the thickness of the pipe material P0. is constant regardless of its size.

In addition, as for the pipe material, if the inner diameter shape is circular,
The external shape is not limited to a circular shape, and various irregular shapes can be cut.

[Effects of the Invention] According to the method and apparatus of the present invention detailed above, when cutting a pipe, it is possible to prevent the occurrence of burr on the cutting side of the blade, eliminating the need for burr removal and post-processing. Moreover, since one pipe material can be cut simultaneously at multiple locations, efficient cutting can be achieved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an inner diameter chuck mechanism constituting the main part of a pipe cutting device according to the present invention, FIGS. 2 and 3 are a side view and a front view showing the overall structure of the pipe cutting device, and FIG. The figure is a front view of the cutting mechanism, FIG. 5 is an explanatory diagram showing a state in which the pipe is taken out after cutting, and FIG. 6 is an enlarged sectional view of the main part in the cut state. 1 Machine frame, lO... Inner diameter chuck mechanism, 15... Chuck body, 16... Holding claw, 19... Core bar, 30... Cutting mechanism, 33... Cutting tool, Po... Pipe material, P... ·pipe. Figure 1 Figure 2 Patent Applicant NISMC Corporation Figure Figure Figure Figure

Claims (1)

[Claims] 1. A pipe material to be cut is attached and chucked to an inner diameter chuck mechanism that evenly chucks the inner diameter of the pipe material over almost the entire cutting area, and the pipe material is held together with the inner diameter chuck mechanism. The pipe material was rotated around its axis, and multiple cutting tools arranged at required intervals from a direction perpendicular to the axis of the pipe material were cut by the thickness of the pipe, making at least one revolution of the pipe material. When cutting is finished, the inner chuck mechanism loosens the chucking of the pipe and takes out the pipe, thereby cutting multiple pipes from one pipe material at the same time. Pipe cutting method. 2. A machine frame is provided with an inner diameter chuck mechanism for attaching and chucking a pipe material, and a cutting mechanism for cutting the pipe material held by the inner diameter chuck mechanism, and the inner diameter chuck mechanism is equipped with a machine frame. The above-mentioned cutting mechanism is composed of a cylindrical chuck body rotatably supported by a frame, and retaining claws that appear and retract by the drive of a core metal inserted into the chuck body are uniformly arranged throughout the chuck body. A multi-cavity pipe characterized in that a large number of cutting tools are rotatably supported at required intervals, and these tools can cut into a pipe material held by an inner diameter chuck mechanism by the thickness of the pipe. Cutting device.