KR101912069B1 - chamfering tool for pipe inner - Google Patents

Abstract

The present invention relates to a pipe inner chamfering tool capable of more precisely chamfering a pipe end inner circumferential surface, comprising: a chamfering tool for uniformly chamfering an inner surface of a pipe in which a circumferential irregular deformation is present, A cutting bit; A bite holder in which the bite is detachably fixed and a position restricting projection is formed on one side; A rotary shaft having a guide shaft formed on one side thereof so as to move the bite holder and a central shaft connected to a rotary shaft of the rotary device; A spring installed in the guide groove to elastically support one end of the byte holder; Elastic adjusting means provided at an end of the spring opposite to the bite holder for adjusting the tension of pushing the bite holder by a distance between the bite holder and the bite holder by being tightened or loosened by a female screw hole formed in the bite; And a cover detachably attached to one surface of the rotating body so as to cover the guide groove and having a long guide hole formed therein for moving the position limiting protrusion.

Description

A chamfering tool for pipe inner < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe inner chamfering tool, and more particularly, to a pipe inner chamfering tool that enables more accurate chamfering of a pipe end inner circumferential surface even with a circumferential deformation.

A pipe is a tube used as a means for moving fluid from one place to another, and is usually manufactured in a cylindrical shape having a circular cross-section in consideration of strength and bending property.

These pipes are made of an extrusion type in which the material is discharged through a circular outlet, and a banding type in which the plate gradually bends to form a circular cylinder.

Burrs are formed at the ends of the pipes during manufacturing process, and these burrs are caught in the process of hitting the operator's hands or joining with other pipes in the course of work, and the assemblability is deteriorated.

The pipe thus manufactured is subjected to chamfering in which the inner circumferential surface of the end is cut to remove burrs, and Patent Literatures 1 to 3 are examples of technologies related to chamfering.

[0004] Patent Document 1 discloses a power transmission system comprising a worktable formed in two stages, a motor as a power source mounted on a lower plate of the worktable, a power transmission means connected to the motor, A chip box provided at an intermediate front portion of a lower portion of an upper plate of the work table for collecting chips generated when the pipe material is processed by the processing means; A pipe chamfering machine composed of a clearing means for removing foreign matter,

Patent Document 2 discloses a chamfering machine for a large-diameter pipe, in which the chamfering machine is fixed to the ground, and a plurality of support rods having different lengths of rods according to the diameter of the pipe, A lower freely rotatable turntable for rotating the pipe at 180 ° by a decelerating motor and fixed on the top of the turntable. The lower free rotating turntable is disposed between the front and rear pedestals, The first and second lifting levers and the second lifting levers, which are angularly moved in the shape of 'X', are lifted up and down by a lifting cylinder so that the pipe is lifted up and down A lift device made up of elevating means, A tool holder configured to transfer the byte holder of the byte chamfering the end of the eave to the center and the edge, and a machining device which is inserted into the pipe during chamfering and clamps the inner surface of the pipe, Chamfering machine,

Patent Literature 3 discloses a chamfering apparatus for adjusting the distance according to the length of a pipe cut to a predetermined length by a tool transfer box, wherein the chamfering apparatus is provided at the lowermost end of the pipe A pair of link assemblies coupled to a first rotating shaft that rotates by a forward stroke of a first cylinder provided at one side of the main body of the pipe, and a second jig having a pipe at its tip, A fixing part for fixing the fixing part to the fixing part; When the pipe is firstly fixed, a second rotating shaft that rotates by a forward stroke of the second cylinder provided at one side of the main body, and a machining tool that continuously rotates by the inclination angle of the cam coupled to the second rotating shaft And a processing section for moving the workpiece to both ends of the pipe for processing.

These various chamfering techniques are being developed, but the pipes are not exactly maintaining their origin, and there are deformations, some of which are deeply shaved in the process of chamfering these pipes, some of which are not shaved and chamfering is not done correctly .

Korean Patent Publication No. 10-2001-0038862 Korean Patent Publication No. 10-2008-0090689 Korean Utility Model Registration No. 20-0260151

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pipe inner chamfering tool capable of more accurately chamfering the inner circumferential surface of a pipe end.

Particularly, the present invention aims to provide an in-pipe chamfering tool that allows the end portion to be uniformly chamfered even if there is circumferential deformation of the inner circumferential surface of the pipe by automatically adjusting the depth of cutting of the end edge of the pipe .

According to another aspect of the present invention, there is provided a chamfering tool for chamfering an inner surface of a pipe, comprising: a cutting tool for cutting an inner surface of a pipe; A bite holder in which the bite is detachably fixed and a position restricting projection is formed on one side; A rotary shaft having a guide shaft formed on one side thereof so as to move the bite holder and a central shaft connected to a rotary shaft of the rotary device; A spring installed in the guide groove to elastically support one end of the byte holder; Elastic adjusting means provided at an end of the spring opposite to the bite holder for adjusting the tension of pushing the bite holder by a distance between the bite holder and the bite holder by being tightened or loosened by a female screw hole formed in the bite; And a cover detachably attached to one surface of the rotating body so as to cover the guide groove and having a long guide hole formed therein for moving the position limiting protrusion.

A connecting member may further be provided between the elasticity adjusting means and the spring.

The elasticity adjusting means may include an adjusting bolt formed with a male screw thread to be tightened to the female screw portion and a fixing nut for fixing the adjusting bolt so as to prevent the adjusting bolt from being loosened in a state where the adjusting bolt is tightened to press the spring.

The bite preferably has an inclined end that is inclined at an end opposite the pipe.

The pipe inner chamfering tool according to the present invention has an effect that the inner surface of the pipe with deformation of the circumference can be chamfered by a certain amount as the bite supported by the spring cuts the pipe at a certain depth along the inner circumferential surface of the pipe.

1 is a perspective view of an example of a pipe inner chamfering tool according to the present invention;
FIG. 2 is a perspective view of a pipe inner chamfering tool according to the present invention,
FIG. 3 is an exploded perspective view of an example of a pipe inner chamfering tool according to the present invention. FIG.
FIG. 4 is a perspective view of the pipe inner chamfering tool according to the present invention,
5 is a cross-sectional view of an operating state of the pipe inner chamfering tool according to the present invention

The present invention is capable of various modifications and various embodiments, and specific embodiments will be illustrated in the drawings and described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention can chamfer the inner surface of the pipe in a certain amount as the bite cuts to a certain depth along the inner circumferential surface of the pipe.

A pipe inner chamfering tool according to the present invention relates to a tool for chamfering an inner circumferential surface of an end portion of a pipe by being rotated by a driving means such as a motor. As shown in Figs. 1 to 3, A cutting tool 10 for cutting the inner surface of the cutting tool 10; A bite holder 20 in which the bite is detachably fixed and a position restricting projection 20d is formed on one side; A rotary body 30 having a guide groove 30g movably formed on one side thereof and having a center shaft 30s connected to a rotary shaft of the rotary device; A spring (40) installed in the guide groove to elastically support one end of the byte holder; An elastic adjusting means provided at an end of the spring opposite to the bite holder for adjusting a tension of pushing the bite holder by a distance between the bite holder and the bite holder by being tightened or loosened by a female screw hole (50); And a cover 60 formed detachably on one surface of the rotating body so as to cover the guide groove and formed with a guide elongated hole 60h formed to be able to move the position limiting protrusion.

The bite 10 is made of a high-strength metal (carbide tip) as a cutting edge for chamfering the end portion of the pipe. The bite 10 is formed such that the front surface has a shape of " (10s) are formed.

The bite (10) is detachably fixed to the byte holder (20).

The bite holder 20 supports the bite so that it can be rotated along the inner surface of the pipe while the bite is rotated in the direction of the centrifugal force when the bite holder 20 rotates by the rotation of the driving means (such as a motor) And the rotating body 30 for this purpose.

That is, the rotary body 30 rotates the bite 10 around the center of the pipe, and at the same time, the bite holder for supporting the bite transmits a rotational force of the driving means to the bite so as to receive a force in the centrifugal direction. 2 and 3, a guide groove 30g is formed so that the byte holder can be moved.

A center shaft 30s is formed at the center of the opposite side of the surface on which the guide grooves of the rotating body 30 are formed and the center shaft is coupled to the rotating shaft of the driving means, do.

When the bite 10 contacts the inner surface of the pipe at a certain pressure, the end of the pipe is chamfered to an appropriate depth.

Thus, the spring 40 is provided to push the bite 10 at a constant force.

The spring 40 is also installed in the guide groove 30g formed in the rotating body and elastically supports one end of the byte holder 20. [

It is preferable that the resilient force of the spring 40 can be adjusted so that the bite 10 can cut the inner surface of the pipe uniformly.

To this end, the elasticity adjusting means 50 is provided.

The elastic adjustment means 50 is provided so as to be in contact with the spring end portion on the opposite side of the bite holder, and the distance between the bite holder and the bite holder is adjusted by being tightened or loosened by the female screw hole 30h formed in the rotating body. The pressure between the holder and the end of the resilient adjusting means is adjusted so that the pressure of the spring pushes the bite holder.

The elastic adjusting means 50 may be variously constructed. However, the adjusting bolt 50b is formed with a male thread on the female screw 30h formed on the rotating body so that the elastic adjusting means 50 can be easily manufactured, And a fixing nut 50n for fixing the adjustment bolt so as not to be loosened in a state where the adjustment bolt is adjusted to the position where it is tightened so as to press the spring.

Further, it is preferable that a connecting member 70 is further provided between the elasticity adjusting means 50 and the spring 40.

When the adjustment bolt 50b constituting the elasticity adjusting means 50 is in contact with the spring directly, the spring may twist in the process of tightening or loosening the adjustment bolt, and the contact with the spring can not be made tight The connecting member 70 is further provided.

As shown in FIG. 3, it is preferable that the spring member 70s and the adjustment member contact portion 70e, which are engaged with one end portion of the spring, are integrally formed with the connecting member 70, .

As shown in FIG. 5, the end of the adjusting means contact portion 70e is in contact with the adjusting means, that is, the end portion of the adjusting bolt 50b. When the adjusting bolt is tightened, a force for pressing the spring is released. The pressing force is weakened.

In the pipe inner chamfering tool of the present invention configured as described above, the bite 10 is subjected to centrifugal force by the rotation of the rotating body 30, and if the distance to which the centrifugal force is applied is not limited, Lt; / RTI >

Therefore, it is necessary to limit the distance that the bite moves in the centrifugal force direction. To this end, the bite bite holder 20 is provided with the position restricting protrusion 20d, and the movement range of the position- A guide elongated hole 60h is formed.

In other words, the guide elongated hole 60h can limit the moving distance in the direction of the maximum centrifugal force to such an extent that a part of the end of the pipe can be cut in the process of revolving the rotary shaft while receiving the centrifugal force, Limiting projection 20d so that the spring can be pushed inwardly as the spring is contracted when it is brought into contact with the inner surface of the pipe.

As shown in FIG. 4, the pipe inner chamfering tool of the present invention having the above-described structure is provided with an end chamber ring of the pipe by driving the driving means in a state of being opposed to the end of the pipe, By the same procedure, chamfering is evenly carried out even for products with deformation of the pipe circumference.

That is, as shown in Fig. 5 (a), the chamfering tool is moved toward the pipe while rotating the rotating body in a state where the inclined end 10s of the bit is aligned to face the inner circumferential face of the pipe, (See Fig. 5 (b)). Then, when the chamber ringing tool is further moved toward the pipe, as shown in Fig. 5 (c), the bite cuts the inner peripheral edge portion of the pipe, .

At this time, due to the elastic action of the spring 30, the bite is cut by a certain depth of the pipe. That is, when a relatively large diameter portion of the pipe and a non-circular pipe meet, the bite is pushed outward by the elastic action and the centrifugal force of the spring, and when the bite portion and the bite meet, the spring contracts and the bite is pushed inward The end of the pipe is chamfered to this depth.

10: Byte
10s: inclined end
20: byte holder
20d: Position restricting projection
30: rotating body
30g: Guide groove 30s: Center axis 30h: Female thread hole
40: spring
50: elasticity adjusting means
50b: Adjusting bolt 50n: Fixing nut
60: cover
60h: guide shaft hole
70:
70s: spring coupling portion 70e: adjusting means contact portion

Claims (4)

A chamfering tool for chamfering an inner surface of a pipe,
A bite 10 for cutting the inner surface of the pipe; A byte holder (20) to which said byte is detachably fixed; A rotary body 30 having a guide groove 30g movably formed on one side thereof and having a center shaft 30s connected to a rotary shaft of the rotary device; A spring (40) installed in the guide groove to elastically support one end of the byte holder; An elastic adjusting means provided at an end of the spring opposite to the bite holder for adjusting a tension of pushing the bite holder by a distance between the bite holder and the bite holder by being tightened or loosened by a female screw hole (50); And a cover (60) detachably mounted on one surface of the rotating body so as to cover the guide groove,
A position restricting projection 20d is formed on one side of the byte holder 20,
A guide elongated hole 60h is formed in the cover 60 so that the position restricting protrusion can move. The spring can be contracted to move the cutting tool in the direction toward the central axis, but can limit the pushing out position ,
A connecting member 70 is further provided between the elastic adjusting means 50 and the spring 40. The connecting member 70 includes a spring engaging portion 70s and an adjusting means abutting portion 70e Wherein the first and second pipes are integrally formed . delete The method according to claim 1,
The resilient adjusting means 50 includes an adjusting bolt 50b having a screw thread formed in a female screw hole 30h and a fixing bolt 50b for fixing the adjusting bolt so that the adjusting bolt is not loosened And a nut (50n). The method according to claim 1,
Characterized in that the bite (10) has an inclined end whose end opposite the pipe has an inclined end.

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