阅读说明：本技术 一种防止切屑被引入管道内部的坡口机 (Beveling machine capable of preventing chips from being introduced into pipeline ) 是由 崔仁诚 于 2019-09-03 设计创作，主要内容包括：一种管道坡口机,其能够容易地将切割管道端部时产生的切屑排出到外部,其包括驱动部、切割部以及管道安装部,其中,驱动部包括驱动轴和壳体,驱动轴基于马达旋转,且由构成前端部的第一轴和构成后端部的第二轴相互轴连接而成；壳体包裹驱动轴的后端和马达；切割部包括安装在所述驱动轴的前端的切割尖端,该切割尖端具有刀片；管道安装部为管状,连接在所述壳体的前部以容纳所述切割部,在设置切割部的侧面形成有排出孔,在管道安装部的前端部安装切割对象的管道；并且所述切割尖端设置为贯穿所述管道的中心点和所述管道的外圆周另一侧的假想基准线到在所述切割尖端的旋转方向上所述刀片和所述管道的内周边缘相接的点的角度a大于从所述基准线到在所述切割尖端的旋转方向上所述刀片和所述管道的外周边缘相接的点的角度b。(A pipe beveling machine which can easily discharge chips generated when cutting an end of a pipe to the outside, comprising a driving part, a cutting part, and a pipe mounting part, wherein the driving part comprises a driving shaft and a housing, the driving shaft is rotated by a motor, and is formed by mutually connecting a first shaft constituting a front end part and a second shaft constituting a rear end part; the shell wraps the rear end of the driving shaft and the motor; the cutting part includes a cutting tip mounted at a front end of the driving shaft, the cutting tip having a blade; a pipe installation part having a pipe shape, connected to the front of the housing to accommodate the cutting part, having a discharge hole formed at a side surface thereof, and installing a pipe to be cut at a front end of the pipe installation part; and the cutting tip is disposed such that an angle a from an imaginary reference line passing through a center point of the pipe and the other side of the outer circumference of the pipe to a point where the blade meets the inner circumferential edge of the pipe in the rotational direction of the cutting tip is greater than an angle b from the reference line to a point where the blade meets the outer circumferential edge of the pipe in the rotational direction of the cutting tip.)

1. A pipe beveling machine for cutting the end faces of pipes, comprising:

a driving part including a motor rotating a driving shaft and a housing wrapping a rear end of the driving shaft and the motor;

a cutting part including a cutting tip mounted at a front end of the driving shaft; and

a pipe installation part having a pipe shape, connected to a front portion of the housing to accommodate the cutting part, and concentrically installing the pipe to be cut at an inner front end portion of the pipe installation part;

wherein the cutting tip is disposed such that a blade on the cutting tip meets one side of a distal end face of the pipe such that an angle a from an imaginary reference line passing through a center point of the pipe and the other side of an outer circumference of the pipe to a point where the blade meets an inner circumferential edge of the pipe in a rotational direction of the cutting tip is greater than an angle b from the reference line to a point where the blade meets an outer circumferential edge of the pipe in the rotational direction of the cutting tip.

2. The pipe beveling machine of claim 1 wherein:

the cutting tip is formed in a polyhedral shape;

the blade is formed at an edge of one side of the cutting tip, and the cutting tip further includes a recess having a shape recessed on the one side in a direction in which the blade is formed.

3. The pipe beveling machine of claim 2 wherein:

the side section of the recess is formed in an arc shape.

4. The pipe beveling machine of claim 3 wherein:

the recess portion is formed such that a diameter thereof gradually increases along one side;

the cutting tip is disposed to meet the pipe such that a portion of the recess having a large diameter faces an outside of the pipe.

5. A pipe beveling machine, comprising:

the driving part comprises a driving shaft and a shell, the driving shaft is composed of a first shaft and a second shaft, the rear end of the first shaft is connected with the motor, and the front end of the first shaft is in a polygonal shape; a groove with a shape corresponding to the front end of the first shaft is formed at the rear end of the second shaft so as to be connected with the first shaft, and the diameter of the central part of the second shaft is smaller so as to form an adjusting groove; the housing encloses the rear end of the first shaft and the motor;

a cutting part including a cutting tip mounted at a front end of the second shaft;

a pipe installation part which is tubular and is connected to the front part of the housing to accommodate the cutting part, so that the pipe to be cut is concentrically installed at the inner front end part of the pipe installation part; and

an adjustment portion including a bearing and a return spring; the bearing is inserted into the adjusting groove, and a moving protrusion for moving the second shaft forward or backward according to an external force is formed at an outer side; the return spring returns the moving protrusion moved forward by an external force and the second shaft to the rear direction.

6. The pipe beveling machine of claim 5 wherein:

the adjusting part also comprises a guide sleeve,

the guide sleeve is formed into a tubular shape, the front end of the guide sleeve is fixed on the pipeline mounting part, the rear end of the guide sleeve is fixed on the shell, and a guide groove with a preset length is formed in the front-rear direction of one side surface of the guide sleeve;

the moving protrusion is inserted into the guide sleeve, thereby defining a moving range of the moving protrusion in a front-rear direction.

7. The pipe beveling machine of claim 6 wherein:

the adjusting part also comprises a moving component and an adjusting component,

the moving assembly is formed in a tubular shape having a predetermined length so as to wrap the guide sleeve, a protrusion receiving groove for receiving an upper end of the moving protrusion is formed at one side of an inner surface of the moving assembly, and a screw groove is formed at an outer surface of the moving assembly so as to move in a front-rear direction of the outer surface of the guide sleeve;

the adjusting assembly is tubular, is arranged on the outer side of the moving assembly and is combined with the moving assembly through a bolt;

the moving assembly moves forwards or backwards along with the rotation of the adjusting assembly, one end of the return spring is fixed on the adjusting assembly, and the other end of the return spring is fixed at the front end of the shell, so that the additionally curled return spring is reset to the original state along with the rotation of the adjusting assembly, and the moving assembly is reset to the original position.

Technical Field

The present invention relates to a pipe beveling machine, and more particularly, to a pipe beveling machine having a structure for preventing chips generated when cutting an end of a pipe from being introduced into the inside of the pipe.

Background

Metal pipes are cut with burrs (Burr) formed at their ends or bent toward the inner diameter of the pipe. Such burrs or bent end surfaces may prevent smooth flow of fluid or cause problems in pipe construction. Especially when the pipes and the pipelines are relatively welded, the ends of the pipes cannot be connected, so that the welding is poor, and the uneven end parts of the pipes need to be additionally milled and polished uniformly.

Further, conventionally, the end portion of the pipe is ground by using a machine tool or the like, and in recent years, a portable pipe beveling machine has been developed and used. In detail, portable beveling machines developed in recent years have a gun-like outer shape, a pipe is fixed to a muzzle portion of the gun, and a rotating shaft having a long tip end to which a cutting tip is attached is arranged inside the muzzle; a motor is provided at one side, and rotates the rotary shaft according to an operation of the driving button, thereby enabling to cut an end of the pipe. Further, a discharge hole for discharging chips is formed in the side surface of the muzzle where the cutting tip is provided, and chips generated when the pipe is cut are taken out through the discharge hole.

However, the conventional pipe beveling machine as described above has a problem that chips generated when cutting a pipe scratch the inner peripheral surface of the pipe which is precisely machined due to the shape of the pipe and the installation structural characteristics of the cutting tip. Further, as the cutting is continuously performed, the length of the generated chips is increased and the chips are tangled with each other, so that it is difficult to take out the chips to the outside of the pipe beveling machine, and there is a problem that when a worker takes out the chips contained in the pipe beveling machine through the discharge hole, the worker may scratch his hands with the sharp chips or mistakenly touch the driving button in the process of taking out the chips, thereby causing a safety accident.

Therefore, it is necessary to develop a pipe beveling machine capable of automatically discharging chips generated when cutting a pipe to the outside of the pipe beveling machine, the length of the formed chips being kept within a predetermined length.

Patent document 1: korean granted patent No. 10-1862315 ('pipe inside and outside diameter integrated beveling machine')

Patent document 2: korean laid-open patent publication No. 10-2007-0114110 (' Power tool for cutting and treating pipes ', the present invention relates to a Power tool for cutting and treating pipes, and more particularly, to a Portable and manually-operable Power tool ')

Disclosure of Invention

In order to solve the above-described problems, an object of the present invention is to provide a tube beveling machine (tube-beveling machine) capable of cutting long chips continuously generated without drawing the chips generated when cutting a tube into the tube.

The object of the present invention is not limited to the above-mentioned object, and the non-mentioned or other objects can be clearly understood by the following description.

The pipeline beveling machine is used for cutting the end surface of a pipeline and is characterized by comprising a driving part, a cutting part and a pipeline mounting part; the driving part comprises a motor for rotating a driving shaft and a shell for wrapping the rear end of the driving shaft and the motor; the cutting part includes a cutting tip installed at a front end of the driving shaft and formed with a blade perpendicular to the driving shaft; the pipe mounting part is tubular and is connected to the front part of the shell to accommodate the cutting part, so that the pipe to be cut is concentrically mounted at the front end part of the inner side of the pipe mounting part; wherein the cutting tip is configured such that a blade on the cutting tip meets one side of a distal end face of the pipe perpendicularly to each other such that an angle a from an imaginary reference line, which is a reference line passing through a center point of the pipe and the other side of an outer circumference of the pipe, to a point where the blade meets an inner circumferential edge of the pipe in a rotational direction of the cutting tip is larger than an angle b from the reference line to a point where the blade meets an outer circumferential edge of the pipe in the rotational direction of the cutting tip.

At this time, the cutting tip is formed in a polyhedral shape, the blade is formed at an edge of one side of the cutting tip, and the cutting tip further includes a recess having a shape recessed on the one side in a direction in which the blade is formed.

The side cross section of the recess is formed in an arc shape.

More precisely, the recess is formed such that its diameter gradually increases along one side; the cutting tip is disposed to meet the pipe such that a portion of the recess having a large diameter faces an outside of the pipe.

And the cutting tip is provided with the blade at each of the two surfaces which are not adjacent, respectively, so that when the blade at one side edge is worn, the blade at the other side edge can be used by changing the installation direction of the cutting tip.

And the duct installation part has a discharge hole for discharging chips at a side surface where the cutting tip is provided.

Optionally, the pipe beveling machine of the present invention includes a driving portion, a cutting portion, a pipe mounting portion, and an adjusting portion; the driving part comprises a driving shaft and a shell, the driving shaft consists of a first shaft and a second shaft, the rear end of the first shaft is connected with the motor, the front end of the first shaft is in a polygonal shape, a groove in a shape corresponding to the front end of the first shaft is formed at the rear end of the second shaft so as to be connected with the first shaft, an adjusting groove is formed in the center of the second shaft due to the small diameter, and the shell wraps the rear end of the first shaft and the motor; the cutting part comprises a cutting tip mounted at the front end of the second shaft; the pipe mounting part is a pipe shape with a discharge hole for discharging the cutting chips on the side surface, and is connected to the front part of the shell to accommodate the cutting part, so that the pipe to be cut is concentrically mounted at the front end part at the inner side; the adjusting part includes a bearing inserted into the adjusting groove and having a moving protrusion formed at an outer side thereof to move the second shaft forward or backward according to an external force, and a return spring; the return spring returns the moving protrusion moved forward by the external force and the second shaft backward.

At this time, the adjusting part further includes a guide sleeve formed in a tubular shape, the front end of which is fixed to the duct mounting part and the rear end of which is fixed to the housing, and a guide groove of a predetermined length is formed in the front-rear direction of one side surface thereof; the moving protrusion is inserted into the guide sleeve, thereby defining a moving range of the moving protrusion in a front-rear direction.

The adjusting part further comprises a moving component and an adjusting component, wherein the moving component is tubular with a preset length and wraps the guide sleeve, a protrusion accommodating groove for accommodating the upper end of the moving protrusion is formed on one side of the inner surface of the moving component, and a thread groove is formed on the outer surface of the moving component, so that the moving component moves along the front and back directions of the outer peripheral surface of the guide sleeve; the adjusting component is tubular and is arranged on the outer side of the moving component and is in bolt combination with the moving component; the moving assembly moves forward or backward along with the rotation of the adjusting assembly, and one end of the return spring is fixed on the adjusting assembly, and the other end of the return spring is fixed on the front end of the shell, so that the additionally curled return spring is reset to the original state along with the rotation of the adjusting assembly, and the moving assembly is reset to the original position.

More precisely, the thread groove formed on the outer surface of the moving assembly is a spherical thread groove, and the inner surface of the adjusting assembly is a ball screw nut.

The pipeline beveling machine based on the structure has the following effects: chips generated due to the installation structure of the cutting tip are not introduced into the interior of the pipe beveling machine.

And, based on the shape characteristics of the recess, the generated chips can be guided outward and automatically discharged through the discharge hole.

Also, a plurality of blades and recesses are formed on one cutting tip, so that it can be repeatedly used several times.

In addition, due to the structure of the return spring, the generated cutting chips can be cut off rapidly, and the situation that the cutting chips are tangled can be prevented.

And, based on the removal subassembly and the adjustment assembly of bolted connection, can the accurate position of adjusting cutting tip.

Drawings

Fig. 1 is a perspective view of a pipe beveling machine in accordance with a preferred embodiment of the present invention.

FIG. 2 is a schematic side cross-sectional view of a pipe beveling machine in accordance with a preferred embodiment of the present invention.

Fig. 3 is a partially enlarged view of fig. 2.

Fig. 4 is a side sectional view schematically showing a state where the cutting tip of the pipe beveling machine of the preferred embodiment of the present invention is moved backward.

Fig. 5 is a partially enlarged view of fig. 4.

Fig. 6 is a perspective view showing the cutting tip of the pipe beveling machine in the preferred embodiment of the present invention.

Fig. 7 is a schematic plan view illustrating a state in which a cutting tip is mounted in accordance with a preferred embodiment of the present invention.

Fig. 8 is a schematic front view showing a cutting tip and a pipe installation structure of a conventional pipe beveling machine.

Fig. 9 is a front schematic view showing the installation structure of the cutting tip and the pipe of the pipe beveling machine in the preferred embodiment of the present invention.

Fig. 10 is a perspective view showing a state in which the cutting tip of the pipe beveling machine according to the preferred embodiment of the present invention cuts the end surface of the pipe.

Description of reference numerals:

100: driving part

110: motor with a stator having a stator core

130: drive shaft

131: first shaft 133: second shaft

134: the adjustment groove 135: combination groove

150: shell body

300: the handle 310: actuating button

500: regulating part

501: sliding bearing 503: position fixing ring

510: bearing 511: moving projection

530: a guide sleeve 531: guide groove

550: moving assembly

551: protrusion receiving groove 553: spherical thread groove

570: the adjustment assembly 590: reset spring

700: pipe fitting

710: head 711: discharge hole

730: holding jig 750: fastening member

900: cutting part

910: the tip holder 930: cutting tip

931: concave part

1000: pipeline beveling machine

Detailed Description

Before explaining the technical idea of the present invention more specifically with reference to the accompanying drawings, it should be understood that the following explanations of terms or words used in the specification and claims are not limited to general or dictionary meanings, but should be construed as meanings and concepts conforming to the technical idea of the present invention on the principle that the inventor can appropriately define the concept of terms in order to explain his invention in the best way.

Therefore, the embodiments described in the following description and the configurations shown in the drawings are only preferred embodiments of the present invention and are not intended to represent all the technical ideas of the present invention, and thus it can be understood that various modifications may be available instead at the time of filing the present application.

The technical idea of the present invention will be described in more detail below with reference to the accompanying drawings. The drawings are merely examples shown for more specifically explaining the technical idea of the present invention, and the technical idea of the present invention is not limited to the forms in the drawings.

Fig. 1 is a perspective view of a pipe beveling machine in accordance with a preferred embodiment of the present invention.

The pipe beveling machine 1000 according to the preferred embodiment of the present invention is used for cutting and flattening the end surfaces of pipes, and as shown in fig. 1, is formed in a substantially gun shape, and includes a driving portion 100, a handle 300, an adjusting portion 500, a pipe mounting portion 700, and a cutting portion 900.

The driving part 100 drives the cutting tip to rotate the cutting tip for cutting the end portion of the pipe substantially along the circumferential edge of the pipe.

FIG. 2 is a schematic side cross-sectional view of a pipe beveling machine in accordance with a preferred embodiment of the present invention; FIG. 3 is an enlarged view of a portion of FIG. 2; FIG. 4 is a schematic side cross-sectional view showing a state in which the cutting tip of the pipe beveling machine of the preferred embodiment of the present invention is moved backward; fig. 5 is a partially enlarged view of fig. 4.

As shown in fig. 2 to 5, the driving part 100 includes a motor 110, a driving shaft 130, and a housing 150.

In detail, the motor 110 is connected to a rear end of the driving shaft 130 to rotate the driving shaft 130.

The driving shaft 130 is constructed in a manner that a first shaft 131 and a second shaft 133 are coupled to each other, wherein the first shaft 131 has a polygonal shape at a front end and is coupled to the motor 110 at a rear end to receive a driving force; the second shaft 133 is formed in a rod shape, a central portion thereof is formed to have a small diameter to form an adjustment groove 134, and a rear end of the second shaft 133 is formed with a coupling groove 135 having a shape corresponding to a front end of the first shaft 131 to be axially coupled to the front end of the first shaft 131. The driving shaft 130 is configured such that the second shaft 133 and the first shaft 131 are integrally rotatable based on the shape characteristics of the front end of the first shaft 131 and the coupling groove 135, and the driving shaft 130 has an adjustable overall length as the second shaft 133 moves in the front-rear direction. For reference, fig. 2 and 3 show a state in which the length of the driving shaft 130 becomes long due to the forward movement of the second shaft 133; fig. 4 and 5 show a state in which the length of the driving shaft 130 becomes shorter as the second shaft 133 moves rearward. The cutting part 900 is coupled to the front end of the second shaft, and the cutting part 900 includes a cutting tip 930, which will be described in more detail after describing the adjustment part 500 and the pipe installation part 700.

The housing 150 encloses the rear end of the first shaft 131 and the motor 110, and is formed with a handle 300 at its lower side in an elongated shape. A driving button 310 controlling the driving of the motor 110 is disposed at one side of the handle 300.

The adjusting part 500 is used to move the second shaft 133 in the forward and backward directions, thereby adjusting the position of the cutting tip 930 coupled to the front end of the second shaft 133. Such an adjusting part 500 includes a bearing 510, a guide sleeve 530, a moving assembly 550, an adjusting assembly 570, and a return spring 590.

The bearing 510 is inserted into the adjusting groove 134 formed at the second shaft 133, and a moving protrusion 511 is formed at an outer side. The bearing 510 is a rolling bearing, and the inner ring thereof rotates together with the rotation of the second shaft 133, but the outer ring thereof and the moving protrusions 511 on the outer ring thereof are not affected by the rotation of the second shaft 133.

The guide sleeve 530 has a tubular shape, and an inner circumferential surface thereof is disposed at a predetermined distance from an outer circumferential surface of the driving shaft 130 so as to be concentric with the driving shaft 130, and a rear end thereof is fixed to a front side of the housing 150. Further, a long guide groove 531 is formed in one side of the guide sleeve 530 in the front-rear direction, and the moving protrusion 511 is received in the guide groove 531, thereby limiting the moving range of the moving protrusion 511 in the front-rear direction. Here, when the moving protrusion 511 moves in the front-rear direction along the guide groove 531, the second shaft 133 also moves in the front-rear direction.

The moving assembly 550 is formed in a pipe shape so as to wrap an outer circumferential surface of the guide sleeve 530, which is shorter than the guide sleeve 530 in length, and has a protrusion receiving groove 551 formed at one side thereof to receive an upper end of the moving protrusion 511 and a ball screw groove 553 formed at the outer circumferential surface. The moving unit 550 is coupled to be movable in the front-rear direction along the outer circumferential surface of the guide bushing 550, and the moving protrusion 511 and the second shaft 133 received in the protrusion receiving groove 551 are moved along with the moving unit 550.

An adjusting member 570 is concentrically disposed with the displacing member 550 at the outside of the displacing member 550, and the adjusting member 570 is formed in a long tubular shape compared to the displacing member 550. The inner side of the adjusting unit 570 is formed of a ball screw nut, and is bolt-coupled to the moving protrusion 511.

Here, the adjusting unit 570 is rotatably interposed between the housing 150 and a duct mounting part 700 to be described later to fix a position in a front-rear direction thereof, and when the adjusting unit 570 is rotated in a clockwise or counterclockwise direction about the driving shaft, the moving unit 550 bolt-coupled to the adjusting unit 570 is moved in a forward or rearward direction. At this time, as the moving assembly 550 moves, the second shaft 133 and the cutting tip 930 also move.

The return spring 590 is a conventional coil spring formed so as to wrap the driving shaft 130, and has one end fixed to the adjustment assembly 570 and the other end fixed to the housing 150. The return spring 590 is coupled to be in a normal state when the adjusting unit 570 moves the moving unit 550 backward to the maximum, and when the adjusting unit 570 is rotated by an external force to move the moving unit 550 forward, the return spring 590 generates an elastic force along with an additional curl, and at the moment when the external force is released, the adjusting unit 570 rotates in the reverse direction of the original rotation direction by the elastic force of the return spring 590, and moves the moving unit 550 backward to the home position. For reference, in order to sufficiently exert the elastic force of the return spring 590, a ball thread groove formed at the outer side surface of the moving member 550 has a very large lead value.

As described above, when the adjustment unit 570 of the adjustment part 500 is rotated in one direction, the moving unit 550, the moving protrusion 511, and the second shaft 133 are moved forward, thereby adjusting the position of the cutting tip 930 attached to the front end of the second shaft 133; when the adjusting unit 570 is rotated in one direction, the return spring 590 generates an elastic force, and when the external force applied to the adjusting unit 570 is removed, the adjusting unit 570 is automatically rotated in the opposite direction, thereby moving the moving protrusion 511 and the second shaft 133 backward in time.

In addition, a sliding bearing 501 may be further installed between the driving shaft 130 and the guide sleeve 530 so that the second shaft 133 is more easily moved in the front and rear directions, and the front and rear ends of the adjustment assembly 570 may be further installed with position fixing rings 503.

In addition, grooves (not shown) are formed at a predetermined distance along the outer circumferential edge on the outer surface of the adjustment member 570; a stopper (not shown) may be disposed at a portion where the housing 150 and the adjustment assembly 570 are connected, the stopper being slidable only in a front-rear direction, and when sliding forward, a front end of the stopper is inserted into any one of the grooves to support the adjustment assembly 570 so as not to be rotatable, and when sliding backward, the stopper is disengaged from the groove so as to allow the adjustment assembly 570 to be rotatable.

The pipe mounting part 700 includes a head 710, a holding jig 730, and a fastening member 750. The head 710 is formed in a tubular shape, and a discharge hole 711 for discharging chips is formed at a side surface thereof, and the head 710 is fixed to a front end of the guide sleeve 530 or is integrally formed with the guide sleeve 530. The head 710 internally accommodates the cutting part 900, and preferably, the discharge hole 711 is formed at a position corresponding to the mounting position of the cutting tip 930. The pipe 10 to be cut is inserted into the inside front end portion of the head 710 concentrically with the head 710. In order to firmly fix pipes 10 having various diameter specifications, a pair of semicircular holding jigs 730 are inserted into the inner front end portion of the head 710, and a fastening member 750 capable of adjusting the distance between the pair of holding jigs 730 is disposed at one side of the head 710, wherein the holding jigs 730 and the fastening member 750 have the same structure as the holding jigs 730 and the fastening member 750 in the related art, and thus, a detailed description thereof is omitted.

For reference, the pipe 10 is inserted and fixed between the pair of holding jigs 730.

The cutting part 900 includes a tip holder 910 and a cutting tip 930.

The tip holder 910 is formed in a plate shape protruding forward from the front end of the second shaft 133, is offset to one side from the center of the second shaft 133, and has a screw groove formed in the center thereof in the vertical direction. Also, the tip holder 910 further includes a support wall protruding upward toward an edge of one side of the center direction of the second shaft 133.

Fig. 6 is a perspective view showing the cutting tip of the pipe beveling machine in the preferred embodiment of the present invention.

As shown in fig. 6, the cutting tip 930 is formed in a rectangular parallelepiped shape and is flat, i.e., the length in the vertical direction is shorter than the length in the left-right direction and the length in the front-rear direction, and a thread groove is formed in the vertical direction in the center portion. The cutting tip 930 is formed with a blade 933 at each edge of two surfaces which are not adjacent, more precisely, an upper surface and a lower surface, and a depression 931 recessed in an arc shape is formed in a direction in which the blade 933 is formed. At this time, the diameter of each of the recesses 931 is gradually increased in a direction toward an edge side. The radius of curvature of the recess 931 is also gradually increased. This is because the larger the radius of curvature, the smaller the diameter of the spiral chip roll generated when cutting the pipe 10, so that the longer the length of the generated chip, the smaller the diameter of the spiral chip roll, thereby reducing the volume of the chip and reducing the entanglement phenomenon of the chip. On the other hand, the blades 933 are respectively formed on the respective edges of the upper and lower surfaces of the cutting tip 930, and the blade 933 at one side edge can be used by changing the installation direction when the blade 933 at the other side edge is worn, so that each cutting tip 930 can be used with 8 blades 933, thereby having economical effects.

Fig. 7 is a schematic plan view illustrating a state in which a cutting tip is mounted in accordance with a preferred embodiment of the present invention.

As shown in fig. 7, the cutting tip 930 and the tip holder 910 are bolt-coupled by a screw groove of the tip holder 910 in a state where the cutting tip 930 is placed on the tip holder 910. At this time, the blade 933 at one side edge of the cutting tip 930 is perpendicular to the driving shaft 130. Since the length of the cutting tip 930 in the front-rear direction is longer than the length of the tip holder 910, the tip of the cutting tip 930 protrudes forward of the tip holder 910. When the cutting tip 930 is attached to the tip holder 910, the blade 933a for cutting the pipe 10 is a blade 933 protruding forward of the tip holder 910, and more precisely, of the blades 933 protruding forward of the tip holder 910, the blade 933 positioned in the rotational direction of the drive shaft 130 is a blade 933a for cutting the distal end surface of the pipe 10. Also, the blade 911a for cutting the distal end surface of the pipe 10 is contiguous to one side of the distal end surface of the pipe 10 with a certain inclination, and preferably, the blade 933a for cutting the distal end surface is contiguous to the distal end surface of the pipe 10 in a perpendicular manner.

Fig. 8 is a schematic front view showing a cutting tip and a pipe installation structure of a conventional pipe beveling machine.

As shown in fig. 8, in the conventional pipe beveling machine, since the blade 933a of the cutting tip 930 for cutting the end surface of the pipe 10 is on the same line as the center point of the pipe 10, there is a problem that the formed chips are introduced into the inside of the pipe 10 due to the shape characteristics of the pipe 10.

Fig. 9 is a front schematic view showing the installation structure of the cutting tip and the pipe of the pipe beveling machine in the preferred embodiment of the present invention.

In order to solve the above problems, as shown in fig. 7, in the pipe beveling machine according to the preferred embodiment of the present invention, the cutting tip 930 is disposed so that an angle a, which is an angle from a virtual reference line L passing through the center point O of the pipe 10 and the other side of the outer circumference of the pipe 10 to a point at which the blade 933a contacts the inner circumferential edge of the pipe 10 in the rotational direction of the cutting tip 930, is greater than an angle b; the angle b refers to an angle from the reference line L to a point where the blade 933a contacts the outer circumferential edge of the pipe 10 in the rotating direction of the cutting tip 930. As described above, by providing the cutting tip 930 in such an arrangement, the swarf generated in the rotational direction of the cutting tip 930 can be automatically generated in the outside direction of the pipe 10, so that the problem of the swarf being introduced into the inside of the pipe 10 can be prevented.

Fig. 10 is a perspective view showing a state in which the cutting tip of the pipe beveling machine according to the preferred embodiment of the present invention cuts the end surface of the pipe.

In particular, in the depression 931 corresponding to the blade 933a of the distal end surface of the cutting pipe 10, the portion having the larger diameter and the larger radius of curvature is directed to the outside of the pipe 10, and not only can the generated chips be guided to the outside of the pipe 10 by the depression 931 to more effectively prevent the chips from being introduced into the inside of the pipe 10, but also there is an effect of automatically discharging the chips 1 guided to the outside through the discharge holes.

Further, as described above, by increasing the radius of curvature of the depression 931, the diameter of the chips generated by the spiral winding is made small, the problem of chip entanglement is prevented, and the chips can be smoothly discharged through the discharge holes due to their small volume.

Also, when there is a concern that the length of the swarf generated when cutting the distal end portion of the pipe 10 is greater than a predetermined length, and thus the swarf may be tangled, the cutting tip 930 brought into contact with the distal end surface of the pipe 10 may be immediately spaced by releasing the external force applied to the adjustment member 570, and thus the continuously generated swarf 1 may be rapidly cut.

The technical idea of the present invention is not limited to the above-described embodiments. The present invention is widely applicable and various modifications can be made by those skilled in the art without departing from the gist of the present invention claimed in the claims. Accordingly, such improvements and modifications within the skill of the art are deemed readily apparent and within the scope of the present invention.

According to the beveling machine disclosed by the invention, due to the structures of the cutting tip and the concave part, the cutting chips can be automatically discharged outwards through the discharge hole while not being introduced into the pipeline; one cutting tip has a plurality of blades and recesses so as to be reusable many times; due to the structure of the return spring, the generated cuttings can be prevented from being tangled; the present invention has industrial applicability in that the position of the cutting tip can be precisely adjusted due to the bolt-combined moving assembly and adjusting assembly, thus crossing the limitations of the prior art, so that not only the utilization of the related art but also the apparatus adapted to the related art has sufficient possibilities in terms of marketing or sales, and can be clearly implemented in practice.