JP2007021686A - Machine for cutting-off and chamfering pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a machine for cutting-off and chamfering a pipe, which machine can cut off the pipe with high dimensional accuracy and further can chamfer the edge of the cut-off end. <P>SOLUTION: The machine for cutting-off and chamfering the pipe comprises a power cutter tool 1 provided with a disk cutter 9 for carrying out the cutting-off and the chamfering of the pipe on the side of the front portion thereof, a positioning member 2 for receiving the outside peripheral surface of the pipe in the radial direction, and a supporting arm 3 for connecting the power cutter tool 1 and the positioning member 2, wherein one end of the supporting arm 3 is pivotally mounted on the tip end portion of the power cutter tool 1 in the axial direction such that the power cutter tool 1 can turn to the angles for carrying out the cutting-off and the chamfering of the pipe via an angle adjusting mechanism 4, and further the positioning member 2 is pivotally mounted to the other end arranged so as to cross the one end of the supporting arm 3, and the power cutter tool 1 can carry out the pivotal movement for the cutting-off and chamfering of the pipe. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pipe cutting and chamfering machine for cutting a pipe made of metal or synthetic resin with high dimensional accuracy and chamfering a cut end face.

  2. Description of the Related Art Conventionally, there is a type of providing a regulating member having a mountain-shaped cross section that regulates the angle of a cutter with respect to the circumferential direction of a pipe to be cut, and arranging the regulating member on the pipe to cut the pipe (for example, see Patent Document 1) .

  However, since the regulating member in Patent Document 1 is pivotally attached to a fixed protective cover that covers the cutter so that the cutter can be pivoted, the dimensional accuracy between the rotating shaft of the cutter and the protective cover is poor and the cutting accuracy of the pipe is low. There was a problem. In addition, since the strength of the protective cover is insufficient, the protective cover is easily deformed when it is hit against another object or dropped, and the cutting accuracy may be greatly reduced, making it impossible to cut. In addition, since such a pipe cutting machine pivotally attaches a restricting member to the stationary protective cover of the disc grinder, the restricting member must be removed when using the disc grinder for other purposes. Therefore, a tool is required and it takes time to attach and detach, so it was necessary to perform a grinder work using another disc grinder.

  In order to solve these problems, the present applicant has applied for a tube cutting machine (see Patent Document 2). However, even in the tube cutting machine of Patent Document 2, the positioning member must be removed from the electric disk cutter in order to perform grinder work such as chamfering, but it takes time to attach and detach the positioning member and a tool is required. For this reason, the grinder work is usually performed by another disc grinder. For this reason, a spare disk grinder has to be provided, resulting in an increase in running cost.

Moreover, chamfering with a disk grinder is a hand-held operation using a disk cutter with diamond abrasive grains attached to the side surfaces, so the problem is that the chamfer angles are inaccurate and uneven, and the insertion into the joint is not smooth. there were.
JP 2000-5926 A Japanese Patent Application No. 2004-294874

  An object of the present invention is to provide a pipe cutting and chamfering machine that can perform pipe cutting with high dimensional accuracy and chamfering of the cutting edge of the pipe with high dimensional accuracy.

  The present invention includes a power cutter tool provided with a disk cutter for cutting and chamfering a pipe on the front side, a positioning member that receives a radially outer peripheral surface of the pipe, and a support arm that connects the power cutter tool and the positioning member. In this case, one end of a support arm is pivotally attached to the front end of the power cutter tool in the axial direction so that the power cutter tool can be rotated to an angle at which the power cutter tool cuts and chamfers through an angle adjusting mechanism. 2. A tube cutting and chamfering machine according to claim 1, wherein a positioning member is pivotally attached to the other end of the tube, and the power cutter tool is capable of pivoting the tube and chamfering. In the invention of claim 1, in the invention of claim 1, the pipe cutting and chamfering machine in which the positioning member is detachable from the power cutter tool via the clamp mechanism is claimed in claim 2, and in the invention of claim 1 or 2, The safety cover for covering the jitter cutting and chamfering machine tubes and an elastic body in which the invention of claim 3.

  The present invention includes a power cutter tool provided with a disk cutter for cutting and chamfering a pipe on the front side, a positioning member that receives a radially outer peripheral surface of the pipe, and a support arm that connects the power cutter tool and the positioning member. In this case, one end of a support arm is pivotally attached to the front end of the power cutter tool in the axial direction so that the power cutter tool can be rotated to an angle at which the power cutter tool cuts and chamfers through an angle adjusting mechanism. A positioning member is pivotally attached to the other end that is arranged to intersect with the one end, and the power cutter tool is capable of pivoting for cutting and chamfering the pipe, so that the disk is at an angle perpendicular to the axial direction of the pipe. An operation for positioning the cutter, a cutting operation for cutting the disc cutter into the tube, an operation for positioning the side surface of the disc cutter at the chamfer angle of the cut end surface, and a disc cutter The operation to cut the side surface into the end face of the pipe can be switched easily and accurately, so there is no need to have a spare disk grinder for chamfering work, and the cutting angle and chamfering can be done via a positioning member. Since the angle can be accurate, cutting and chamfering can be performed uniformly and with high dimensional accuracy, and the joint can be smoothly joined.

  Since the positioning member is detachable from the power cutter tool via the clamp mechanism as in claim 2, the positioning member can be easily and quickly detached without using a tool or the like. Since the power cutter tool can be immediately used as an ordinary disc grinder, it is not necessary to prepare a power cutter tool such as a spare disc grinder, so that the running cost can be reduced.

  The safety cover that covers the disc cutter is made of an elastic body as in claim 3 so that the blade exposed to the upper surface when the tube is cut is covered, as well as the portion that contacts the tube when the cutter is chamfered. Since it bends and imitates, chamfering work is not hindered. Moreover, since the gap is sealed by contacting the tube surface during chamfering, scattering of cutting dust generated during the chamfering operation can be suppressed, which is preferable in terms of the working environment.

Next, a preferred embodiment of the present invention will be described in detail with reference to FIGS.
In FIG. 1, 1 is a power cutter tool in which a disc cutter 9 such as an electric or pneumatic disc grinder is provided at the front side, and 2 is a tube made of metal or synthetic resin for the disc cutter 9 of the power cutter tool 1. The positioning member 3 is arranged so as to be accurately orthogonal to the axis of the support arm 3, and the support arm is connected to the positioning member 2 so as to be capable of rotating and pivoting the power cutter tool 1. 4 is a disk cutter of the power cutter tool 1. 9 is an angle adjusting mechanism for setting the cutting angle and the chamfering angle, 5 is a clamping mechanism for detaching the positioning member 2 from the power cutter tool 1, and 6 is a pivot for setting the pivoting resistance of the power cutter tool 1 with respect to the positioning member 2. The resistance setting mechanism 7 is a safety cover made of an elastic material 7 a that covers the disk cutter 9.

  As shown in FIG. 1, the positioning member 2 is formed by bending a rectangular plate at an angle of about 120 ° at the center to form a mountain shape in cross section. By making contact with the outer circumferential surface in the radial direction, the axis of the tube is coincident with the axis of the tube, and the disc cutter 9 of the power cutter tool 1 is used as a reference when setting the angle and the chamfering angle perpendicular to the axis direction of the tube. In addition, the outer size (vertical and horizontal) of the positioning member 2 is about 120 × 200 mm, and can be used for a tube having an outer diameter of about 90 mm to 320 mm. Further, the positioning member 2 is not limited to the mountain shape, and may be an arc shape matching the outer diameter of the tube. Furthermore, it goes without saying that the positioning member 2 may be provided with a pair of left and right rollers.

  Reference numeral 10 denotes a grip grip attached to the positioning member 2, and a collar 11 is attached to the tip of the grip grip 10. The scissors 11 divide the disc cutter and fingers to prevent the hands from touching the disc cutter 9 inadvertently due to slipping of hands during work.

  Further, as shown in FIG. 1, the positioning member 2 is provided with a bearing 2a pivotally attached to the other end of the support arm 3 whose axis is aligned with the ridge line of the angled inclined surface. The bearing 2a is attached to one side edge of the positioning member 2 with its front end slightly extended so that the positioning member 2 does not interfere with the bearing 3b provided at the other end of the support arm 3 that pivots. Yes.

  The support arm 3 has a bearing 3a provided at one end and a bearing 3b provided at the other end intersecting with each other and connected with an inverted L-shaped member to have different heights. A shaft 13 that is detachably inserted into a bearing 1a formed at the tip end in the axial direction of the power cutter tool 1 is attached. Further, a shoulder bolt 20 (described later) for connecting the bearing 2a of the positioning member 2 is inserted into the bearing 3b at the other end. By making the heights of the intersecting bearings 3a and 3b different, when starting to cut the disc cutter 9 into the pipe, the power cutter tool 1 takes an upward inclination of about 30 ° so that the working posture does not become unnatural. Needless to say, the bearings 3a and 3b may have the same height.

  Further, the power cutter tool 1 pivotally attached to one side edge of the positioning member 2 via the support arm 3 is pivotable, and as shown in FIG. 7, the cutting operation is performed with a small force by the principle of the lever. Needless to say, the power cutter tool 1 may be pivotally mounted on the ridgeline of the positioning member 2 via the support arm 3.

  Further, as shown in FIGS. 4, 5, and 6, the angle adjusting mechanism 4 is provided with a stopper pin 15 that is inserted into the shaft 13 so as to be orthogonal to the axial direction, and a support that removably engages the stopper pin 15. Two V-shaped notches 16 formed on the end surface of the bearing 3 a of the arm 3 and at an angle inclined by 75 ° from the horizontal, and the shaft 13 so that the stopper pin 15 is pressed against each V-shaped notch 16. And a spring 17 for biasing the. The disk cutter 9 of the power cutter tool 1 is arranged at an angle for chamfering the tube cutting position and the cutting end surface by locking the stopper pin 15 to the V-shaped notches 16 having different angles. Reference numeral 18 denotes a spring receiver, and the spring receiver 18 is a flanged bolt that is screwed into a screw hole of the shaft 13. Further, when the disk cutter 9 is inclined by 75 ° from the tube cutting angle by the angle adjusting mechanism 4, a chamfering angle of 15 ° is obtained.

  The clamp mechanism 5 is generally referred to as a clamping lever. By tightening or loosening the screw 5b with the lever 5a, the pointed end of the screw 5b is inserted into the conical hole 13a of the shaft 13 of the support arm 3. The operation of inserting and removing can be easily performed without using a tool. Normally, the lever 5a is locked with the screw 5b and does not move. However, when the lever 5a is lifted, the lock is released and the lever 5a can move to the screw 5b. The lever 5a can be changed to an arbitrary position while being tightened in the conical hole 13a. Reference numeral 13b denotes a concave groove formed in the shaft 13, which prevents surface damage of the shaft 13 due to the screw 5b when a clamping operation is mistakenly performed at a portion where the conical hole 13a is not provided.

  The swing resistance setting mechanism 6 includes a shoulder bolt 20 that is inserted and supported by the bearing 3 b of the support arm 3 and the bearing 2 a of the positioning member 2, a tightening nut 21 that is screwed into the shoulder bolt 20, and the shoulder bolt 20. And a spring 23 having one end abutting against the bearing 2 a and the other end abutting a flat washer 22 received by the tightening nut 21. By tightening the tightening nut 21, the spring 23 is A constant elastic force is applied, the contact pressure between the bearing 2a and the bearing 3b is regulated, and the swing resistance between the power cutter tool 1 and the positioning member 2 is set as appropriate. Reference numeral 24 denotes a locking nut for the tightening nut 21.

  The safety cover 7 includes an attachment frame 7a and an elastic body 7b made of a brush, a resin plate, a rubber plate, or the like. When the tube is cut, the safety cover 7 covers the blade portion of the disk cutter 9 exposed upwardly, When the chamfering operation is performed while the disk cutter 9 is inclined, the elastic body 7b in contact with the tube surface is bent so as not to interfere with the chamfering operation. Further, since the elastic body 7b of the safety cover 7 is in close contact with the pipe surface, it prevents the cutting dust from scattering during the chamfering operation, which is effective in improving the working environment.

  In this configuration, the gripping grip 10 attached to the positioning member 2 and the power cutter tool 1 are gripped, and the disk cutter 9 of the power cutter tool 1 is aligned with the cutting position of the tube and on the tube. The positioning member 2 is brought into contact. When the positioning member 2 is brought into contact with the radially outer peripheral surface of the pipe, the positioning member 2 is accurately arranged along the axis of the pipe.

  Since the positioning member 2 and the power cutter tool 1 are pivotally attached via the support arm 3, the disk cutter 9 of the power cutter tool 1 can be cut in the axial direction of the pipe to be cut by accurately positioning the positioning member 2 on the pipe. Will be accurately positioned at a position orthogonal to.

  Next, when the power of the power cutter tool 1 is turned on and the power cutter tool 1 is pushed down, as shown in FIG. 2, the disk cutter 9 disposed substantially at the center of the positioning member 2 and in contact with the tube. Will make a cut. When the cutting of the tube thickness is completed by the disc cutter 9, the tube is gradually cut in the circumferential direction by moving the power cutter tool 1 and the positioning member 2 along the circumferential direction of the tube. It becomes. This is because the disk cutter 9 is once cut at an angle perpendicular to the axis of the tube and is accurately positioned along the axis of the tube by the positioning member 2, so that the power cutter tool 1 and the positioning member 2 are circumferentially arranged. The tube can be cut accurately just by moving the.

  In this way, when the cutting of the upper surface side of the tube is completed, the tube is rotated to place the uncut portion on the upper side, and the same cutting operation as described above may be performed. By repeating such operations, the entire peripheral surface of the pipe is cut at a right angle with high dimensional accuracy. Of course, when the tube has a small diameter, it can be cut off by one cutting operation without rotating the tube as described above.

  Next, when chamfering the cut end surface of the cut pipe, first, if a force is applied to rotate the power cutter tool 1 relative to the positioning member 2, the spring pressure of the spring 17 of the angle adjustment mechanism 4 is applied. Against this, the support arm 3 is guided by the shaft 13 and slid rightward in FIG. By this slide, the stopper pin 15 engaged with the V-shaped notch 16 formed on the end face of the bearing 3a of the support arm 3 is extracted from the tube cutting position.

  When the stopper pin 15 is extracted from the V-shaped notch 16, the power cutter tool 1 and the positioning member 2 are rotated relative to each other by 75 ° and moved onto the V-shaped notch 16 serving as a chamfering position. When the V-shaped notch 16 is reached, the pulling operation is stopped, the stopper pin 15 and the V-shaped notch 16 are engaged, and the power cutter tool 1 and the positioning member 2 are pressed against each other by the urging force of the spring 17. As a result, the disk cutter 9 is locked at the chamfered position. Therefore, when the power cutter tool 1 is driven and the power cutter tool 1 positioned on the positioning member 2 is pushed down, the side surface of the disk cutter 9 is made of a tube. Chamfering is performed at an angle of 15 ° in contact with the cut end face.

1 is a partially cutaway plan view showing a preferred embodiment of the present invention. It is a side view which similarly shows the cutting process state of a pipe | tube. It is a side view which similarly shows the chamfering process state of a pipe | tube. It is a partially notched top view which expands and shows the principal part in preferable embodiment of this invention. It is a side view of the support arm used for preferable embodiment of this invention. It is a partially cutaway perspective view showing a support arm used in a preferred embodiment of the present invention in an exploded manner with a shaft. It is explanatory drawing which shows the cutting state in preferable embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power cutter tool 2 Positioning member 3 Support arm 4 Angle adjustment mechanism 5 Clamp mechanism 7 Safety cover
7a Elastic body 9 Disc cutter

Claims (3)

  A power cutter tool provided with a disk cutter for cutting and chamfering the tube on the front side, a positioning member that receives the radially outer peripheral surface of the tube, and a support arm that connects the power cutter tool and the positioning member, One end of a support arm is pivotally attached to an axial end of the power cutter tool so that the power cutter tool can rotate to an angle at which the power cutter tool cuts and chamfers via an angle adjustment mechanism, and the one end of the support arm A pipe cutting and chamfering machine characterized in that a positioning member is pivotally attached to the other end arranged to intersect, and the power cutter tool can perform cutting and chamfering pivoting of the pipe.   2. The pipe cutting and chamfering machine according to claim 1, wherein the positioning member is detachable from the power cutter tool via a clamp mechanism.   3. The tube cutting and chamfering machine according to claim 1, wherein the safety cover that covers the disk cutter is an elastic body.

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