JPH07156011A - Guiding mechanism for cutting tool - Google Patents

Abstract

PURPOSE:To provide a guiding mechanism for a cutting tool by which position adjustment for bringing a cutting tool into contact with a tube body and depth setting adjustment for a groove to be cut can be easily and surely carried out. CONSTITUTION:A cutting tool 1 rotating around a tube body with a tube machining unit 4 and a fixing part 13 engages with the outer circumferential face of the tube body so as to cut the tube body. When a groove of the preset depth is formed according to the progress of cutting, a copying roller 28 is brought into contact with the outer circumferential face of the tube body 3 so as to be rotated in the circumferential direction. Then, even though the tube machining unit 4 and the fixing part 13 are moved in the radius direction further, a movable part, 14 maintains its radius directional position against a spring means 25, so that the cutting tool 1 dose not cut the tube body 3 beyond necessity. In addition, a contact adjustment, which is carried out as a starting preparation for the cutting tool 1, between the cutting tool 1 tip and the tube body can be surely carried out without any influence on the spring means 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool guiding mechanism for use in, for example, a pipe cutting and grooving 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 moving member 114 engaged with the spiral groove 122 of the three-dimensional cam 112, the moving member 114 is moved so that the groove cutting tool 117 contacts the outer peripheral surface of the pipe 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. (EN) Provided is a bite guide mechanism capable of cutting a groove having a uniform depth, and further capable of easily and reliably adjusting the position of the bite to be brought into contact with a pipe body and setting and adjusting the depth of the groove to be cut. The purpose is to

[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 cutting tool provided in a pipe processing unit, the guide mechanism including a fixed portion that is immovable with respect to the pipe processing unit and a movable portion that is arranged so as to be movable in the radial direction with respect to the fixed portion. The movable part holds a holding member having a bite and a copying roller whose position is adjustable with respect to the movable part so that the movable part can be moved and adjusted, and the movable part is a lever pivotally attached to the fixed part. Is connected to one end of the lever, and spring means for urging the movable portion inward in the radial direction is arranged at the other end of the lever.

[0011]

The tool, which rotates around the pipe together with the pipe processing 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. After that, even if the pipe machining unit and the fixed portion are further moved in the radial direction, the movable portion can prevent the cutting tool from cutting the pipe body more than necessary in order to maintain its radial position against the spring means. Absent. Further, according to the present invention, the contact adjustment between the tip of the cutting tool and the pipe body, which is performed as a preparation for starting the cutting tool, can be easily and surely performed without being affected by the spring means.

[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 substantially cylindrical pipe processing unit 4 is eccentrically supported relative to the eccentric cylinder portion of the spindle 5, which is supported concentrically and rotatably with respect to the pipe body 3, The guide mechanism 2 of the groove cutting tool 1 of the present invention is fixed to the pipe processing unit 4. At the time of driving, the spindle 5 and the pipe processing unit 4 are individually driven to rotate with a slight speed difference from each other by the power transmission means 8 configured as a pair of pinions 6 and 7, for example. As a result, the groove cutting tool 1 integrated with the pipe processing unit 4 and the guide mechanism 2 rotates around the pipe body 3 and, at the same time, moves in the radial direction with respect to the pipe body 3 to perform groove cutting work. The spindle and pipe processing unit 4
The detailed structure of the power transmission means 5 and the like is disclosed in the specification of Japanese Patent Application No. 5-67621 filed by the applicant of the present application, and is not related to the essence of the present invention. Detailed description is omitted. Here, 9 is a cutting tool for cutting the pipe body 3, and is fixed to the block 10 which is also fixed to the pipe processing unit 4 so as to be able to move in and out.

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 two frame bodies 11 fixed to the pipe processing unit 4.
And a pedestal 12, and a movable portion 14 supported by the fixed portion 13 so as to be movable in the radial direction.

As shown in FIG. 3, the movable portion 1 is composed of an upper plate 16 and both side plates 15 and 15 and has a substantially U shape, and the upper plate 16 has a bolt shape having an operating head 29. The male threaded portion 17 of the No. 1 penetrates downward. A holding member 18, which will be described later, is screwed onto the male screw portion 17 by a female screw portion 19 and is suspended. In addition, this movable part 14
The first pins 20, 20 project from the both side plates 15, 15. The first pin 20 is pivotally supported by a pivot recess at one end of levers 22, 22 pivotally attached to the frame body 11 by second pins 21, 21.

Further, at the other ends of the levers 22 and 22,
A horizontal frame 24, which is rotatable with respect to the levers 22, 22, is pivotally supported by the third pins 23, 23 so as to connect both levers 22, and the horizontal frame 24 supports the second pin 21 as a fulcrum. It can move up and down freely. Further, the horizontal bridging piece 24 is biased upward by a disc spring 25 as spring means mounted on the base 12 of the fixed portion 13.

As described above, the holding member 18 suspended by the male screw portion 17 is accommodated in the space between the side plates 15 of the movable portion 14 while the rotation of the holding member 18 is restricted. The groove cutting tool 1 is fixed to the shaft by a fixing screw 26 from the lateral direction and a feed screw 27 from the upward direction, and a copying roller 28 is pivotally mounted near the inside thereof.

The adjustment and action when the groove is cut in the tubular body 3 will be described with reference to FIGS. 4 (a) (b) (c) (d).
(A) and (b) show the step of adjusting the groove cutting depth.
The depth of the groove depends on the tip position of the copying roller 28 and the groove cutting tool 1
Is determined by the distance D from the tip position of the holding member 18, and by loosening the fixing screw 26 of the holding member 18 and screwing in the feed screw 27, the bite for groove cutting without applying any load to other members. 1 can be sent to the position of (b). After this distance D is determined, the work is completed by tightening the fixing screw 26.

(C) shows a step of initial setting of the groove cutting tool 1, which prevents the groove cutting tool 1 from idling, so that the groove cutting tool 1 is preliminarily operated before the power transmission means 8 is operated. This is a work in which the tip end of is contacted with the tube body 3. in this case,
By rotating the operation head 29, the male screw portion 17 sends the holding member 18 downward with respect to the movable portion 14.
Even in this state, the holding member 18 can be fed out without applying any load to the disc spring 25 and other members.
The position where the groove cutting tool 1 comes into contact with the tubular body 3 and does not move further can be easily identified.

(D) shows a state in which the groove cutting of the tube body 3 has progressed by the groove cutting tool 1, and the cutting progresses,
When a groove having a predetermined depth is formed in the tube body 3, the copying roller 2
8 contacts the outer peripheral surface of the tubular body 3 and rolls in the circumferential direction.

At this point, the grooving of the pipe body 3 is completed, but the pipe processing unit 4 does not immediately stop,
After that, the rotary motion and the eccentric motion are continued. However, since the copying roller 28 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 18 integrated with the groove cutting tool 1 has the tubular body 3 through the copying roller 28.
A reaction force outward in the radial direction is received from the outer peripheral surface of the lever, and the holding member 18, the male screw portion 17, and the movable portion 14 are pushed upward based on this reaction force, and the lever 22 tilts with the second pin 21 as a fulcrum. However, the disc spring 25 is compressed while moving relatively outward in the radial direction with respect to the pipe processing unit 4 and the fixed portion 13. In the case of this embodiment, the cutting tool 9 shown in FIG.
Will be disconnected.

FIGS. 5 and 6 show a second embodiment of the present invention, which differs from the above-mentioned embodiment in that a position-adjustable cutting tool 30 is added to the holding member. Therefore, the male screw portion 17 extending downward from the movable portion is at a position displaced from the center. This cutting tool 30
As in the above-described embodiment, the fixing screw 31 and the feed screw 32 are provided, and the tip of the cutting tool 30 and the tip of the groove cutting tool 1 can be vertically adjusted with respect to the tip of the copying roller 28. ing.

According to this embodiment, as shown in FIGS.
As shown in FIG. 5, the groove cutting tool 1 is adjusted to determine the groove depth D. In the process shown in (c), the tip of the cutting tool 30 is replaced with the cutting tool 30 as an initial setting. The work of contacting the tubular body 3 is performed in advance. Also in this case, by rotating the operation head 29, the male screw part 17 sends the holding member 18 downward with respect to the movable part 14. Therefore, the holding member 18 can be fed out without applying any load to the disc spring 25 and other members, and the cutting tool 3
It is possible to easily determine the position where 0 comes into contact with the pipe body 3 and the cutting bite 30 does not move any further. When the cutting of the pipe body 3 is completed and the groove cutting is started, the same operation as in the state (d) is performed also in this embodiment.

Although the embodiments have been described above with reference to the drawings, the specific structure is not limited to the embodiments, and modifications and additions within the scope of the present invention are included in the present invention. .

[0025]

The present invention has the following effects.

(A) 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 centering accuracy of the tubular body and the main body.

(B) The contact adjustment between the tip of the cutting tool and the pipe body, which is performed as a preparation for starting the cutting tool, can be performed lightly, easily and surely without being affected by the spring means.

(C) The depth of the groove can be adjusted by the cutting tool easily and surely without being affected by the spring means.

[0029]

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of a pipe cutting grooving machine according to the present invention.

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

FIG. 3 is a view taken along the line AA of FIG.

FIG. 4 is a schematic view showing a process of adjusting and cutting a groove cutting tool.

5 is an enlarged view of a second embodiment corresponding to FIG.

FIG. 6 is a BB arrow view of the second embodiment corresponding to FIG. 3;

FIG. 7 is a side view partially showing a cross-sectional view showing a conventional groove cutting tool guiding mechanism.

[Explanation of symbols]

1 Grooving Tool (Bite) 2 Guide Mechanism 3 Tubular Body 4 Tubular Processing Unit 5 Spindle 6 Pinion 7 Pinion 8 Power Transmission Means 9 Cutting Bit (Byte) 10 Block 11 Frame 12 Base 13 Fixed Part 14 Movable Part 15 Side Plate 16 Top Board 17 Male screw part 18 Holding member 19 Female screw part 20 1st
Pin 21 Second pin 22 Lever 23 Third pin 24 Horizontal piece 25 Disc spring (spring means) 26 Fixing screw 27 Feed screw 28 Copying roller 29 Operating head 30 Cutting tool 31 Fixing screw 32 Feed screw

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masaya Kinugawa 4-1-2 1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture Osaka Gas Co., Ltd. (72) Toru Morita 4-chome, Hirano-cho, Chuo-ku, Osaka-shi, Osaka No. 1 and 2 in Osaka Gas Co., Ltd.

Claims (6)

[Claims] 1. A guide mechanism for a cutting tool, which is provided in a pipe processing unit configured to move in a radial direction with respect to a tubular body while rotating around the tubular body to be cut, The guide mechanism includes a fixed portion that is immovable with respect to the pipe processing unit and a movable portion that is arranged so as to be movable in the radial direction with respect to the fixed portion. The movable portion is positionally adjustable with respect to the movable portion. A holding member provided with a cutting tool and a copying roller is movably held, and the movable portion is connected to one end of a lever pivotally attached to a fixed portion and the other end of the lever is movable. A guide mechanism for a bite, wherein spring means for urging the portion inward in the radial direction is arranged. 2. The guide mechanism for a cutting tool according to claim 1, wherein the cutting tool is a groove cutting tool. 3. The cutting tool guide mechanism according to claim 1, wherein the cutting tool is a groove cutting tool and a cutting tool, and the cutting tool is fixed to the holding member adjacent to the groove cutting tool. 4. A guide mechanism for a cutting tool according to claim 2 or 3, wherein the groove cutting tool can be adjusted in position in the radial direction of the pipe body to be machined by an adjusting screw with respect to the holding member. 5. A guide mechanism for a cutting tool according to claim 3, wherein the cutting tool is adapted to be adjusted in position in a radial direction of a pipe body to be machined by an adjusting screw with respect to a holding member. 6. The holding portion is rotationally restricted with respect to the movable portion, and is screwed with a male screw portion and a female screw portion extending from the upper surface of the movable portion. The male screw portion is rotated to move the holding member to a radius. 6. The movable structure according to claim 1, wherein the movable structure is movable in any direction.
The guide mechanism of the bite described in any of.