KR101635462B1

KR101635462B1 - connecting rod for boring bar

Info

Publication number: KR101635462B1
Application number: KR1020160043935A
Authority: KR
Inventors: 이헌재
Original assignee: 주식회사 정한
Priority date: 2016-04-11
Filing date: 2016-04-11
Publication date: 2016-07-01

Abstract

More particularly, the present invention relates to a connecting rod used for mounting a cutting tool such as a boring bar on a main shaft, and comprises a connecting rod body, a fastening bolt, and a bolt fixing nut used for fastening the fastening bolt to the connecting rod body. , And a boring bar linkage used to broaden the machining range for the workpiece.

Description

Connecting rod for boring bar

One of the cutting tools, boring bars, is a tool used to enlarge the drilled hole or to cut the hole if the inner wall of the hole is not smooth, thereby enlarging the diameter of the hole or increasing the roughness of the inner wall.

Such a boring bar usually has a boring head with a cutting tip attached to the bottom of the boring bar. If the depth of the work hole to be machined is shorter or longer than the length of the boring bar, a boring process can be performed by fastening a boring bar with an arbor. However, in the case of a workpiece having a hole whose depth is greater than the entire length (height) of the boring bar, boring is performed through the upper surface of the work, The boring operation is cumbersome and the operation time is prolonged. In addition, there is a problem that the roughness of the boring surface may not be smooth smoothly.

As a proposed conventional technique for solving the problem of boring, there is a coupling device for a holder for a cutting tool proposed in Japanese Patent No. 10-1169348.

The above-mentioned patent discloses a holder connection structure which is tightly assembled and closely assembled so as to prevent a gap from being formed at the tip of a spindle head 81 of a machine tool, and which prevents deformation of the spindle head due to a working load during cutting operation by a tool, (60) comprises a body (61) having a cutter (66) at the other end thereof; A head part 62 provided at one end of the body 61 and closely attached to the tip of the spindle head part 81; A stator bolt 65 assembled to the hole 63 of the head portion 62 at one end and assembled to the taper hole 83 of the spindle head 81; A plurality of fastening holes 64 are formed in the head portion 62 at regular intervals and a fastening hole 82 is formed in the spindle head 81 so as to face the fastening holes. And a fastener 67 is fastened to the spindle head 82 so that the body is tightly assembled to the spindle head. In this case, the length of the body is shorter than the hole of the workpiece to be machined There is a problem that the above-mentioned problem, that is, the boring operation is troublesome and the operation time is long, and the roughness of the boring surface may not be smooth smoothly.

In addition, when the head portion 62 is brought into close contact with the tip of the spindle head portion 81, a fastener must be used, so that when one fastener is fastened more than the fastener on the other side, So that the boring surface of the workpiece to be machined can not but be processed to have a low roundness.

That is, the stud bolt 65 is disposed between the body 61 and the spindle head 81 to guide the fastening position of the body 61 so that the spindle head 81 and the body 61 are completely fastened The central axis between the fastening holes is completely aligned with the fastening hole 64 in the body 61 and the fastening hole 67 is also fastened to the spindle head portion 81 by the fastening hole 67. Therefore, When the fastening force is applied to one of the fastening holes 67, the center axis of the body 61 is positioned at the center of rotation of the spindle head 81, There has been a problem that it is distorted with the axis, that is, a declination can occur.

Accordingly, it is an object of the present invention to provide a connecting rod for a boring bar that connects an arbor to a main shaft of a machine tool, connects a connecting rod according to the present invention to the arbor, and fastens a cutting tool such as a boring bar to the connecting rod to increase the working range .

In addition, a through hole is formed in the body of the connecting rod for fastening a cutting tool such as a boring bar, and a sloped surface inclined at a predetermined angle is formed in the through hole, and a shank portion of the boring bar coupled to the inclined surface corresponds to the inclination angle of the inclined surface Another object of the present invention is to provide a connection block for a boring bar which has an inclined surface so that the center axis of the connecting body body and the center axis of the shank portion of the connection ring are aligned with each other as the shank portion of the boring bar is coupled to the connection body.

In addition, when the shank of the boring bar is completely engaged with the connecting rod body by the fastening bolt, the circumferential surface of the shank portion is brought into close contact with the inclined surface of the connecting rod body, and the end surface of the boring bar having the shank portion closely contacts with the end surface of the connecting rod body, Another purpose of the present invention is to provide a boring bar linkage capable of increasing the speed of a boring operation while at the same time being able to withstand high cutting forces by restraining the two sides of the boring bar while preventing the vibration of the boring bar.

A connecting rod for a boring bar according to the present invention is a connecting rod used for mounting a cutting tool such as a boring bar to a main shaft of a machine tool. The connecting rod is fixed to an arbor attached to and detached from a machine tool, A body, a fastening bolt inserted into the connecting rod body, and a bolt fixing nut for fastening the fastening bolt to the connecting rod body.

The connecting rod for a boring bar according to the present invention has an effect of connecting an arbor to a main shaft of a machine tool, connecting a connecting rod according to the present invention to the arbor, fastening a cutting tool such as a boring bar to the connecting rod, And the shank portion of the boring bar coupled to the inclined surface is inclined so as to correspond to the inclination angle of the inclined surface. The inclined surface of the through- And the shank portion of the boring bar is aligned with the central axis of the shank portion of the boring bar so that the machining accuracy is enhanced. When the shank of the boring bar is fully engaged with the connecting body by the fastening bolt, The circumferential surface of the shank portion is in close contact with an inclined surface of the connecting rod body, The surface of the boring bar coupled to the body of the connecting rod is in a two-plane confinement so that it can withstand a high cutting force, so that the speed of the boring operation can be increased and the trembling of the boring bar can be prevented.

1 is a perspective view of a separate configuration of the present invention
Fig. 2 is a cross-
Fig. 3 is a diagram showing the state of use
Fig. 4 is a cross-
Fig. 5 is a schematic view of the fastening means and fastening tool according to the present invention
FIG. 6 is a diagram showing the use state separation configuration of the present invention
FIG. 7 is a diagram showing the use state combining structure of the present invention
Fig. 8 is a cross-sectional view
Fig. 9 is a schematic view
Fig. 10 is a cross-

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a cross-sectional view of the present invention, FIG. 3 is a use state view of the present invention, FIG. 4 is a sectional view of FIG. 3, and FIG. The connecting rod for a boring bar according to the present invention is a connecting rod used for mounting a cutting tool such as a boring bar 1 to a main shaft of a machine tool, A connecting rod body 11 fixed to the arbor 40 to be attached and detached and having a through hole 13 formed in the central axis direction, a fastening bolt 20 inserted into the connecting rod body 11, And a bolt fixing nut (30) for fixing the bolt to the connecting body body (11).

First, the arbor (40, arbor) is a structure used for mounting a tool on the main shaft of a machine tool, and a general arbor is used for a machine tool such as a milling machine or a machining center and attaches a cutting tool.

6, the arbor 40 is formed with a shank portion 42 having a tapered end for insertion into the end of the main shaft of the machine tool, and a bolt hole 48 Is formed on the main shaft by bolts and nuts.

A shank portion 12 is formed at one side of the connecting rod body 11 and inclined at a predetermined angle so as to be attached to a fastening groove formed in the arbor 40. A through hole 13 is formed in the center axis direction have.

A fastening bolt 20 is inserted into the connecting rod body 11 and the through hole 13 formed in the connecting rod body 11 is stepped so that the insertion amount of the fastening bolt 20 is restricted by the stepped surface 14 A bolt fixing nut 30 is fastened to the connecting base body 11 so that the fastening bolt 20 is not removed from the connecting base body 11.

That is, the bolt fixing nut 30 is screwed to the threaded portion 16 formed in the through hole 13 of the connecting body body 11 by forming a screw 31 on the outside, Since the gap G is formed between the head portion 21 of the fastening bolt 20 and the bolt fastening nut 30 because the fastening bolt 20 does not come into close contact with the end face of the head portion of the fastening bolt 20, It is possible to rotate freely with respect to the center axis.

The bolt fixing nut 30 is screwed with the screw thread 16 formed in the through hole 13 of the connecting block body 11 due to the screw formed outside and the screw thread 16 formed in the through hole 13 is fixed The shortest distance between the stepped surface 14 and the bolt fixing nut 30 can be set to be equal to or less than the thickness of the head portion 21 of the fastening bolt 20 The gap G is formed between the head portion 21 of the fastening bolt 20 and the end surface of the bolt fixing nut 30 so that the fastening bolt 20 is not completely brought into close contact with the stepped surface 14, do. Due to the gap G, the fastening bolts 20 are coupled in such a manner that they can rotate freely with respect to the center axis thereof.

4, the clearance G is shown as having a clearance between the head portion 21 of the fastening bolt 20 and the bolt fixing nut 30. However, The gap G is also generated between the head portion 21 of the fastening bolt 20 and the stepped surface 14 so that the head portion 21 of the fastening bolt 20 is engaged with the threaded portion 14, The fastening bolt 20 can move between the stepped surface 14 and the bolt fixing nut 30 because the fastening bolt 20 is simply inserted into the space made by the stepped surface 14 and the bolt fixing nut 30, (20) can freely rotate on the basis of its central axis.

In this state, the shank portion 2 of the boring bar 1 is fixed to the lower side of the inclined surface 15 formed on the connecting body body 11 in the state where the fastening bolt 20 and the bolt fixing nut 30 are fastened to the connecting rod body 11 The shank portion 2 of the boring bar 1 is rotated by the rotation of the bolt 20 so that the fastening bolt 20 is engaged with the screw groove formed in the boring bar 1 so as to prevent the boring bar 1 from rotating, The end face of the boring bar 1 on which the shank portion 2 is formed is brought into close contact with the end face 17 of the connecting bar body 11 .

That is, when the shank portion 2 of the boring bar 1 is completely engaged with the connecting rod body 11 by the fastening bolts 20, the circumferential surface of the shank portion 2 is inclined to the inclined surface 15 And the end face of the boring bar 2 on which the shank portion 2 is formed is brought into close contact with the end face 17 of the linking leg body 11 so that the boring bar 1 coupled to the linking leg body 11, .

When the shank portion 2 of the boring bar 1 is continuously rotated in the direction in which the shank portion 2 enters the connecting bar body 11, the boring bar 1 is rotated by the end face 17 of the connecting bar body 11, The fastening bolt 20 and the boring bar 1 are forced to pull each other, so that a pulling force acts on the fastening bolt 20 in the direction of the arrow in FIG. 4 The lower end face of the head portion 21 of the fastening bolt 20 is in complete close contact with the upper end face of the bolt fixing nut 30 and is in contact with the end face of the boring bar 1 in which the shank portion 2 is formed, 17 are also tightly adhered to each other, so that the rigid coupling state is maintained, so that the vibration of the workpiece by the boring bar 1 is reduced and it is able to withstand a relatively strong cutting force.

In the process of turning the fastening bolts 20 in order to fasten the boring bar 1, a tool such as a wrench is inserted into the upper part of the connecting rod body 11 to fit the fastening bolt 20 into the wrench groove formed in the fastening bolt 20 When the boring bar 1 is detached from the fastening bolt 20, a tool such as a wrench may be inserted into the upper portion of the fastening bolt body 11 to rotate the fastening bolt 20 to separate the bolt.

5, a through hole 32 having a diameter larger than the outer diameter of the screw portion 22 of the fastening bolt 20 and smaller than the outer diameter of the head portion 21 is formed at the center of the bolt fixing nut 30 And a tool insertion groove 33 is formed at one end surface in a radial direction so as to be coupled to the thread 16 formed in the through hole 13 of the connecting rod body 11 without being interfered with the threaded bolt 20 .

The bolt fixing nut 30 has an outer circumferential surface formed with a screw 31 for coupling with the screw thread 16 formed on the connecting rod body 11 and a through hole 32 formed therein, And a tool insertion groove 33 is formed in one end surface of the tool insertion groove 33 so that the fastening tool 3 having the protrusion 4 corresponding to the shape of the tool insertion groove 33 is formed, The bolt fixing nut 30 can be engaged or disengaged from the connecting base body 11. [

FIG. 6 is a view showing the state of use separation of the present invention, and FIG. 7 is a view illustrating a state of use in which the present invention is used. And a state before fastening to the arbor (40).

3 and 4, the boring bar 1 is fastened to the connecting rod body 11, and the connecting rod body 11 is fastened to the arbor 40 and finally mounted on the main shaft of the machine tool, .

In the above embodiment, the parallel pin 19 is used to keep the joining position between the connecting body 11 and the boring bar 1 at a constant level. A hole is formed at one side of the connecting body 11 The parallel pin 19 is fixed in a forced fit manner and the positioning groove is formed in the boring bar 1 so that the parallel pin 19 can be fitted.

The arbor 40 described in the above embodiment is an example of an arbor used for a machine tool. The arbor 40 is formed in the shape of a connecting rod 10 and used instead of a connecting rod.

FIG. 8 is a perspective view of the present invention, FIG. 9 is a perspective view of the present invention, and FIG. 10 is a cross sectional view of FIG. 9.

That is, a connecting bar used for mounting a cutting tool such as a boring bar 1 to a main shaft of a machine tool, the connecting bar being attached to and detached from a machine tool and having a through hole 43 formed in the center axis direction, A fastening bolt 20 inserted into the arbor body 41 and a bolt fixing nut 30 fastening the fastening bolt 20 to the arbor body 41, The through hole 43 is partly stepped so that the insertion amount of the fastening bolt 20 is limited by the stepped surface 44. [

A through hole 43 is formed in the arbor 40 itself and a fastening bolt 20 and a bolt fixing nut (not shown) are formed in the through hole 43. In this case, 30 are inserted and fastened to the boring bar 1 by the fastening bolts 20.

The bolt fixing nut 30 is screwed to the threaded portion 46 formed in the through hole 43 of the arbor 40 by forming a screw 31 on the outside, A gap G is formed between the head portion 21 of the fastening bolt 20 and the bolt fastening nut 30 so that the fastening bolt 20 is not in contact with the end surface of the head portion 21 of the fastening bolt 20, Can rotate freely with respect to its central axis.

In this embodiment, it may be difficult to use a workpiece having a hole that is deeper than the entire length of the boring bar 1, but the shank portion 2 of the boring bar 1 is completely fastened to the arbor body 41 by the fastening bolts 20 The circumferential surface of the shank portion 2 is in tight contact with the inclined surface 45 of the arbor body 41 and the end surface of the boring bar 1 on which the shank portion 2 is formed is in contact with the end surface 47 of the arbor body 41 The boring bar 1 which is tightly engaged with the arbor body 41 is tightly coupled with the arbor body 41 so that the arbor body 41 is firmly engaged with the boring bar 1. As a result, The vibration is reduced and it is able to withstand the strong cutting force.

The shank portion 42 and the bolt hole 48 constitute a structure for fixing the arbor 40 to the main shaft of the machine tool The parallel pin 49 is configured to bring the joining position of the boring bar 1 and the connecting rod 10 to be constant at all times so that the parallel pin 49 can be inserted into the boring bar 1 or the connecting rod 10 A pinhole is formed.

The above embodiments have been described with respect to the configuration and the effect of fixing the boring bar 1 to the connecting block 10 or fixing it to the arbor 40. However, in addition to the boring bar 1, a milling cutter, end mill, drill, , And bite.

As a result, the connecting rod for a boring bar according to the present invention increases the working range by connecting an arbor to a main shaft of a machine tool, connecting a connecting rod according to the present invention to the arbor, and fastening a cutting tool such as a boring bar to the connecting rod, A through hole is formed in the through-hole for fastening a cutting tool such as a boring bar to the connecting rod body. A sloped surface inclined at a predetermined angle is formed in the through hole, and a shank portion of the boring bar coupled to the inclined surface is inclined so as to correspond to the inclination angle of the inclined surface. As the shank of the boring bar is coupled to the connecting body, the center axis of the connecting body and the center axis of the shank of the boring bar coincide with each other. Thus, the machining accuracy is enhanced, and the shank of the boring bar is completely engaged The circumferential surface of the shank portion is brought into close contact with the inclined surface of the connecting rod body, The end face of the boring bar is in close contact with the end face of the linking body so that the boring bar coupled to the linking body can be restrained on the two sides so that it can withstand a high cutting force and thereby the speed of boring operation can be increased and the vibration of the boring bar can be prevented .

1. Boring bar 2. (Boring bar) Shank part 3. Fastening tool
4. Projection 5. Through hole
10; Connections
11. Connecting rod body 12. Shank part 13. Through hole
14. Step surface 15. Slope surface 16. Thread
17. Sectional 18. Bolt hole 19. Parallel pin
20; Fastening bolt
21. Head part 22. Screw part
30; Bolt fixing nut
31. Screw 32. Through hole 33. Tool insert groove
40; Arbor
41. Arbor body 42. Shank portion 43. Through hole
44. Step surface 45. Slope 46. Thread
47. Section 48. Bolt hole 49. Parallel pin
G: gap

Claims

A connecting rod used for mounting a cutting tool such as a boring bar (1) to a main shaft of a machine tool,
The connecting rod 10 is fixed to an arbor 40 attached to and detached from a machine tool and includes a connecting rod body 11 having a through hole 13 formed in the center axis direction and a fastening bolt 20 inserted into the connecting rod body 11 And a bolt fixing nut 30 for fixing the fastening bolt 20 to the connecting rod body 11,
The bolt fixing nut 30 has a through hole 32 having a diameter larger than the outer diameter of the threaded portion 22 of the fastening bolt 20 and smaller than the outer diameter of the head portion 21, Wherein a tool fitting groove (33) is formed in a radial direction so as to be engageable with a thread (16) formed in the through hole (13) of the connecting bar body (11)

The method according to claim 1,
Wherein the through hole (13) formed in the connecting rod body (11) is stepped so that the insertion amount of the fastening bolt (20) is limited by the stepped surface (14).

The method according to claim 1,
The bolt fixing nut 30 is screwed to the threaded portion 16 formed in the through hole 13 of the connecting body body 11 by forming a screw 31 on the outside and is screwed to the threaded portion 16 as deeply as possible A gap G is formed between the head portion 21 of the fastening bolt 20 and the bolt fastening nut 30 because the fastening bolt 20 is not in close contact with the end surface of the head portion of the fastening bolt 20, The connecting rod for the boring bar, which is characterized by its ability to rotate freely by reference.

The method according to claim 1,
The slope 15 is inclined at a predetermined angle in the through hole 13. The shank portion 2 of the boring bar 1 coupled to the slope 15 is inclined so as to correspond to the inclination angle of the slope 15, The central axis of the connecting body 11 and the central axis of the shank portion 2 of the boring bar 1 coincide with each other as the shank portion 2 of the boring bar 1 is coupled to the connecting rod body 11 Connections for boring bars.

5. The method of claim 4,
When the shank portion 2 of the boring bar 1 is completely engaged with the connecting rod body 11 by the fastening bolts 20, the circumferential surface of the shank portion 2 is inclined with respect to the inclined surface 15 of the connecting rod body 11 The end face of the boring bar 2 in which the shank portion 2 is formed in close contact with the end face 17 of the connecting leg body 11 so that the boring bar 1 coupled to the connecting leg body 11 is subjected to two- The connecting rod for the characteristic boring bar.

delete

A connecting rod used for mounting a cutting tool such as a boring bar (1) to a main shaft of a machine tool,
The connecting rod includes an arbor body 41 which is attached to and detached from the machine tool and has a through hole 43 formed in the center axis direction, a fastening bolt 20 inserted into the arbor body 41, And a bolt fixing nut 30 for fastening the bolt 20 to the body 41. The through hole 43 formed in the arbor body 41 is partly stepped, Characterized in that the amount is limited.

8. The method of claim 7,
The bolt fixing nut 30 is screwed to the threaded portion 46 formed in the through hole 43 of the arbor 40 by forming a screw 31 on the outside of the bolt fixing nut 30, Since the gap G is formed between the head portion 21 of the fastening bolt 20 and the bolt fixing nut 30 because the fastening bolt 20 is not in close contact with the end surface of the head portion 21 of the bolt 20, A connecting bar for a boring bar characterized by its ability to rotate freely about its central axis.