JPH06304802A - Guiding mechanism for groove cutting tool - Google Patents

Abstract

PURPOSE:To cut a groove having a uniform depth along the outer peripheral surface of a pipe body, and set the depth of the groove to be cut simply and reliably at low cost at that time. CONSTITUTION:A groove cutting tool 1 to rotate around a pipe body 3 together with a cutting unit 4 and a fixed part 7 engages soon with the outer peripheral surface of the pipe body 3, and cuts the pipe body 3. When cutting makes progress and a groove having a prescribed depth is formed, a copying roller 13 comes into contact with the outer peripheral surface of the pipe body 3, and rolls in the circumferential direction. Afterward, even if the cutting unit 4 and the fixed part 7 move further in the radial direction, since a movable part 8 maintains the radial directional position against a spring means 11, the groove cutting tool 1 does not cut the pipe body 3 any more than necessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide mechanism for a groove cutting tool used in, for example, a tube cutting groove slicing machine provided with a cutting tool that rotates substantially concentrically with respect to a fixed tube.

[0002]

2. Description of the Related Art A conventional groove cutting tool guiding mechanism disclosed in Japanese Patent Publication No. 49-37475 has a structure as shown in FIG. In this case, an annular rotary gear 104 is rotatably attached to one side surface of the main body 101 having a hole for inserting the tubular body 102 to be cut,
A tool frame 111 that supports the tool feed gear 108 is fixed to the side wall of the rotary gear 104 by screws 124. The tool carrier frame 108 includes a tool feed gear 108.
A three-dimensional cam 112 that rotates in conjunction with is supported,
In the spiral groove 122 of the three-dimensional cam 112, the tool frame 11
1 is engaged with a spherical body 113 at the tip of a moving element 114 which is movably guided along the axial direction. A groove cutting tool 117 for cutting the groove of the pipe body 102 is integrally connected to the lower end of the moving element 114.

A kicker 1 is attached to the outer peripheral portion of the main body 101.
23 is planted so as to be able to engage with the blade feed gear 108, whereby the blade feed gear 108 abuts the kicker 123 every time the rotating gear 104 makes one rotation, and the blade feed gear 108 is moved. It is designed to be rotated one tooth at a time.

The guide mechanism for the groove cutting tool operates as follows.

A tubular body 102 to be cut in the hole of the main body 101.
After inserting the
The main body 101 is fixed to the pipe body 102 so that the pipe body 102 and the pipe body 102 are concentrically positioned. Next, with the spherical body 113 at the tip of the mover 114 engaged with the spiral groove 122 of the three-dimensional cam 112, the groove cut tool 117 is moved so that the groove cut tool 117 contacts the outer peripheral surface of the tube body 102. Adjust the position with respect to.

When the power source is started to rotate the rotary gear 104, the tool frame 111 integrated with the rotary gear 104 also rotates. Each time the tool frame 111 makes one rotation, the tool feed gear 108 collides with the kicker 123 and is rotated by one tooth each time, whereby the three-dimensional cam 112 also slowly rotates. The spiral groove 122 of the three-dimensional cam 112 is
In the starting end region, the moving member 114 and the grooving bite 117, which are gradually shallower in depth and which engage with the spiral groove 122, are gradually extruded toward the center of the pipe body 102 in the initial stage of cutting. become. After that, the mover 114 and the groove cutting tool 117 are moved by the spiral groove 122 along the axial direction of the pipe body 102,
In this way, a groove having a predetermined depth and width is cut on the outer peripheral surface of the tubular body 102.

[0007]

In such a known guide mechanism, when the outer peripheral surface of the tube body 102 is not a perfect circle or when the main body 101 is not concentrically arranged with respect to the tube body 102. It is no longer possible to form a groove in the tube body 102 having a uniform depth along the circumferential direction. However, in practice, due to manufacturing tolerances of the tube body 102 and tightening force of the fixing bolt 103, the outer peripheral surface of the tube body 102 is often non-circular, and the tube body 1
It is technically extremely difficult to dispose the main body 101 strictly concentrically with respect to 02.

Further, since the depth of the groove formed in the tube body 102 essentially depends on the shape of the spiral groove 122 of the three-dimensional cam 112, the depth thereof depends on the desired depth of the groove to be cut. Each time, it was necessary to select an appropriate one from a large number of expensive solid cams 112 prepared in advance and attach it to the tool frame 111. Moreover, in this case, the three-dimensional cam 1
Since it is almost impossible to visually confirm the depth of the groove to be cut from the shape of the spiral groove 122 of 12,
It was necessary to previously display the depth of the groove to be cut on each solid cam 112.

The present invention has been made by paying attention to such a problem. The present invention is performed along the outer peripheral surface of the tubular body regardless of the shape of the outer peripheral surface of the tubular body and the centering accuracy of the tubular body and the main body. A groove with a uniform depth can be cut, and at that time, the depth of the groove to be cut can be set easily, inexpensively and reliably by simply adjusting the positions of the constituent members. The purpose is to do.

[0010]

In order to achieve the above object, the present invention is constructed so as to move in the radial direction with respect to the pipe body while rotating around the pipe body to be cut. A guide mechanism for a groove cutting tool provided in a cutting unit, the guide mechanism including a fixed portion immovable with respect to the cutting unit and a movable portion arranged so as to be movable in the radial direction with respect to the fixed portion. The movable part comprises a groove cutting tool whose position can be adjusted in the radial direction, and a copying roller adjacent to the groove cutting tool in the axial direction of the tubular body to be cut, and the rotation axis of the copying roller is A spring means for urging the movable portion inward in the radial direction is arranged between the movable portion and the fixed portion substantially parallel to the axis of the pipe body to be cut.

[0011]

The groove cutting tool that rotates around the pipe together with the cutting unit and the fixing portion engages with the outer peripheral surface of the pipe to cut the pipe. When the cutting progresses and a groove having a predetermined depth is formed, the copying roller comes into contact with the outer peripheral surface of the tubular body and rolls in the circumferential direction. Thereafter, even if the cutting unit and the stationary part move further in the radial direction, the movable part no longer requires the grooving bite to cut the pipe body in order to maintain its radial position against the spring means. It cannot happen.

[0012]

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

FIG. 1 schematically shows a part of a pipe cutting grooving machine to which a guide mechanism 2 for a grooving bite 1 of the present invention is applied. In this case, a roughly cylindrical cutting unit 4 is eccentrically and rotatably supported by an eccentric cylindrical portion of a spindle (not shown) rotatably supported concentrically with respect to the pipe body 3. The cutting unit 4 is provided with the guide mechanism 2 for the groove cutting tool 1 of the present invention. At the time of driving, the spindle and the cutting unit 4 are individually driven to rotate with a slight speed difference from each other by the power transmission means 5 configured as a pair of pinions, for example. As a result, the cutting unit 4 and the groove cutting tool 1 rotate around the pipe body 3 and, at the same time, move in the radial direction with respect to the pipe body 3 to perform groove cutting. The detailed configurations of the spindle, the cutting unit 4, the power transmission means 5, etc. are described in Japanese Patent Application No. 5-67621 filed by the present applicant.
However, since they are disclosed in the specification of the publication and are not related to the essence of the present invention, their detailed description will be omitted.

2 and 3 show the structure of the guide mechanism 2 for the groove cutting tool 1 in detail. The guide mechanism 2 basically includes a fixed portion 7 fixed to the cutting unit 4 via an arch-shaped frame body 6 and a movable portion 8 supported by the fixed portion 7 so as to be movable in the radial direction. . The fixed portion 7 is a frame body 6.
A cylindrical body 10 fixedly attached via an end plate 9 is provided inside the cylindrical body 10, and a compression spring 11 for urging the movable portion 8 inward in the radial direction is housed in the cylindrical body 10. The urging force of the compression spring 11 can be adjusted by a cylindrical adjusting nut 12 screwed into the end plate 9.

The movable portion 8 is provided with a holding member 14 which rotatably supports the copying roller 13, and this holding member 14 is provided.
The urging force of the compression spring 11 is transmitted to the upper end surface 15 of the through the flanged sleeve 16. The axis of rotation of the copying roller 13 is substantially parallel to the axis of the tubular body 3.

The side surface of the holding member 14 has a tubular body 3
A recess 17 for accommodating the groove cutting tool 1 located adjacent to the copying roller 13 in the axial direction is provided. The groove cutting tool 1 housed in the recess 17 has the cutting end 1
The upper end surface 19 on the opposite side to 8 is integrally provided with a rod 21 that extends radially through the through hole 20 of the holding member 14 and the cylindrical body 10 of the fixed portion 7.

A support sleeve 22 is fitted on the rod 21, and the lower end portion of the support sleeve 22 has a reduced diameter and is fitted and coupled into the flanged sleeve 16. The upper ends of the support sleeve 22 and the rod 21 are
The adjustment nut 12 penetrates through the through hole to project from the end plate 9, and further, the upper end of the rod 21 projects from the upper end of the support sleeve 22. At the upper end of this rod 21,
A male screw is cut, and a fixing nut 23 is screwed into the male screw.

The upper end surface 19 of the groove cutting tool 1 and the holding member 14
Usually, a spacer (not shown) having an appropriate thickness is provided between the recess 17 and the upper wall surface 24, or the groove cutting tool 1 is laterally fixed with a screw or the like. . Therefore, when a spacer is used, when the fixing nut 23 is tightened, the groove cutting tool 1, the holding member 14, the collared sleeve 1
6 and the support sleeve 22 are integrally connected to each other,
At that time, depending on the thickness of the spacer, the radial distance between the outer peripheral surface portion 25 on the radially inner side of the copying roller 13 and the cutting end portion 18 of the groove cutting tool 1, that is, the depth of the groove to be cut is It will be decided.

It should be noted that the radial distance becomes 0 when no spacer is provided, that is, when the upper end surface 19 of the groove cutting tool 1 and the upper wall surface 24 of the recess 17 of the holding member 14 directly contact each other. In addition, if the dimensions of each member are set, the thickness of the spacer and the depth of the groove to be cut completely match, which is convenient when setting the depth of the groove.

Further, in order to prevent rattling during the cutting of the groove cutting tool 1, the width of the recess 17 of the holding member 14 in the circumferential direction is substantially equal to the width of the groove cutting tool 1 in the circumferential direction. Is advantageous. Furthermore, on one side of the groove cutting tool 1,
If the pressing plate 26 fixed to the cutting unit 4 is in contact, the rattling at the time of cutting the groove cutting tool 1 is more effectively prevented.

The operation of the guide mechanism 2 when cutting the pipe body 3 is as follows.

At the initial stage of cutting, the groove cutting tool 1 and the copying roller 13 which are driven by the rotation of the cutting unit 4 are idle at positions separated from the tube body 3 as shown in FIG. However, when the rotational movement of the cutting unit 4 continues, the eccentric action of the cutting unit 4 causes the groove cutting tool 1 and the copying roller 13 to gradually approach the tube body 3 while rotating. When the cutting end portion 18 of the groove cutting tool 1 is engaged with the outer peripheral surface of the tube body 3, cutting is substantially started.

When the cutting progresses and a groove having a predetermined depth is formed in the tubular body 3, the copying roller 13 comes into contact with the outer peripheral surface of the tubular body 3 and rolls in the circumferential direction (FIG. 4). (See (a)).

At this point, the grooving of the tube 3 is completed, but in most cases, the cutting unit 4 does not immediately stop, but continues the rotary motion and the eccentric motion thereafter. However, since the copying roller 13 is in contact with the outer peripheral surface of the tube body 3 and is rolling as described above, the groove cutting tool 1 no longer cuts the tube body 3 more than necessary. This is because the holding member 14, which is integral with the groove cutting tool 1, receives a reaction force outward in the radial direction from the outer peripheral surface of the tubular body 3 via the copying roller 13, and compresses the compression spring 11 based on this reaction force. At the same time, it moves radially outward relative to the cutting unit 4 and the fixed portion 7 (see FIG. 4B).

[0025]

The present invention has the following effects.

It is possible to cut a groove having a uniform depth along the outer peripheral surface of the tubular body, regardless of the shape of the outer peripheral surface of the tubular body and the accuracy of centering the tubular body and the main body.

B, The depth of the groove to be cut can be easily set only by adjusting the radial position of the groove cutting tool with respect to the movable portion.

C. The depth of the groove to be cut can be easily visually confirmed from the positional relationship between the groove cutting tool and the copying roller in the radial direction.

D. Since it is not necessary to prepare a large number of expensive three-dimensional cams as in the prior art, the manufacturing cost of the guide mechanism is reduced.

[0030]

[Brief description of drawings]

FIG. 1 is a front view schematically showing a part of a pipe cutting grooving machine.

FIG. 2 is an enlarged view of the vicinity of a groove cutting tool guide mechanism in FIG.

3 is a vertical cross-sectional view taken along the line AA of FIG.

FIG. 4 is a vertical sectional view similar to FIG. 3, showing a cutting process using a groove cutting tool.

FIG. 5 is a side view partially showing a sectional view showing a guide mechanism for a conventional groove cutting tool.

[Explanation of symbols]

1 Grooving Tool 2 Guide Mechanism 3 Tubular Body 4 Cutting Unit 5 Power Transmission Means 6 Frame Body 7 Fixed Part 8 Movable Part 9 End Plate 10 Cylindrical Body 11 Compression Spring 12 Adjusting Nut 13 Copy Roller 14 Holding Member 15 Upper End Surface 16 With Collar Sleeve 17 Recessed portion 18 Cutting end portion 19 Upper end surface 20 Through hole 21 Rod 22 Support sleeve 23 Fixed nut 24 Upper wall surface 25 Outer peripheral surface portion 26 Presser plate

Claims (4)

[Claims] 1. A guide mechanism for a groove cutting tool, which is provided in a cutting unit configured to move in a radial direction with respect to a tubular body while rotating around the tubular body to be cut,
This guide mechanism is composed of a fixed part that is immovable with respect to the cutting unit and a movable part that is arranged so as to be movable in the radial direction with respect to the fixed part. It is equipped with a cutting tool and a copying roller adjacent to the groove cutting tool in the axial direction of the pipe to be cut, and the rotation axis of the copying roller is almost parallel to the axis of the pipe to be cut and is fixed to the movable part. A guide mechanism for a groove cutting tool, characterized in that spring means for urging the movable part inward in the radial direction is arranged between the guide part and the part. 2. The movable portion includes a holding member for accommodating and holding the groove cutting tool and the copying roller, and the position of the groove cutting tool is adjustable in the radial direction with respect to the holding member. The groove cutting tool guide mechanism according to claim 1, wherein the biasing force of the spring means acts on the holding member. 3. The holding member is formed with a recess for accommodating the groove cutting tool, and the width of the recess in the circumferential direction is substantially equal to the width of the groove cutting tool in the circumferential direction. The guide mechanism for the groove cutting tool according to claim 2. 4. The groove cutting tool guide mechanism according to claim 2, wherein a pressing plate fixed to the cutting unit is in contact with one side surface of the groove cutting tool.