KR101575567B1

KR101575567B1 - The boring bar

Info

Publication number: KR101575567B1
Application number: KR1020150136131A
Authority: KR
Inventors: 이헌재
Original assignee: 이헌재
Priority date: 2015-09-25
Filing date: 2015-09-25
Publication date: 2015-12-08
Also published as: WO2017052020A1

Abstract

The present invention relates to a boring bar, and more particularly, to a boring bar having a saddle mounted on a body integrally formed with a shank mounted on a tool holder of a machine tool, and a boring head having a cutting tip fastened to the saddle for cutting the workpiece The position of the saddle can be finely adjusted by the rotation of the dial so that the position of the boring head and the cutting tip can be adjusted to precisely process the inner diameter of the workpiece and can be used universally for workpieces having various inner diameters It is a boring bar that can adjust the position of the cutting tip.

Description

The boring bar, which extends the processing range,

The present invention relates to a boring bar, and more particularly, to a boring bar, in which a saddle is mounted on a body formed integrally with a shank mounted on a tool holder of a machine tool, and a boring head having a cutting tip fastened to the work, The position of the saddle can be finely adjusted by the rotation of the dial so that the position of the boring head and the cutting tip can be adjusted to precisely process the inner diameter of the workpiece and can be used universally for workpieces having various inner diameters It is a boring bar that can adjust the position of the cutting tip.

In general, boring is performed by boring a drilled hole or by using a boring bar if the inner wall of the hole is not smooth, thereby enlarging the hole diameter or increasing the roughness of the inner wall. It says.

Such boring is performed mainly by using a boring bar. As a related art related to a boring bar, there is a boring byte proposed in the Utility Model Publication No. 20-1996-0006482.

The above-mentioned utility model is characterized in that a tip is attached to a tip end of a bite body, and a chip pocket continuous to an inclined surface of the tip is formed, wherein the chip pocket comprises a first chip pocket and a second chip pocket, The first chip pocket is inclined at an angle of 15 to 45 with respect to the axis of the bobbin body and is opened to the outer circumferential surface of the bobbin body. Further, the cross-sectional shape of the first chip pocket is defined by the bottom surface of the bobbin body, And the second chip pocket is formed along the front cutting edge of the tip and on the outer circumferential surface on the side opposite to the side where the first chip pocket of the bite body is opened, A boring byte is proposed in which the size of a boring byte, that is, the machining of a workpiece whose inner diameter is changed by attaching the cutting tip to a constant position at all times impossible to use.

As a proposed prior art to solve this problem, there is a sliding type bite holder of a boring machine proposed in Patent No. 10-0621752.

The patent includes a body to which a bite is fixed at one end; A clamp coupled to the body such that the body is slidably movable; And a coupling part provided between the body and the clamp for smoothly sliding the body. The sliding type bite holder of the boring machine has a body sliding along the clamp, The position can be adjusted, but the accuracy of the dimension is reduced by fixing the body by the fastening member.

That is, in the case of the fastening member, the position of the body can be moved finely by the pressure applied to the fastening member, whereby the position of the bite formed at the end of the body can be moved, and the fastening member can be loosened have.

Accordingly, the present invention provides a boring bar and a saddle can be inserted into a body, and a saddle is fastened with a boring head having a cutting tip fixedly coupled to the saddle for cutting a workpiece, and the position of the saddle can be finely adjusted The inner diameter of the workpiece can be precisely adjusted by finely adjusting the position of the cutting tip relative to the center axis of rotation of the body, and a boring bar The purpose is to provide.

The present invention also provides a boring bar having a groove formed on an upper portion of a saddle and a stopper pin coupled to the body by interference fit to limit the movement distance of the saddle, There is another purpose.

In addition, a boring head fastening groove is formed on the bottom surface of the saddle so that the boring head can be inserted, and an adapter is fastened to the front surface of the saddle so as to enlarge the working range. There is another purpose.

The boring bar extends the machining range according to the present invention. The boring bar has a body formed integrally with a shank mounted on a tool holder of a machine tool, and a saddle- And a dial for coupling the saddle to the saddle, wherein the saddle is coupled to a boring head for cutting the workpiece.

The boring bar extending the working range according to the present invention is configured to be able to insert saddles into the body, and the saddle is fastened to the saddle with a boring head fixedly coupled with a cutting tip for cutting the workpiece, The inner diameter of the workpiece can be precisely adjusted by adjusting the position of the cutting tip finely relative to the rotation center axis of the body, and it can be used universally for various workpieces having different inner diameter dimensions, A groove is formed in an upper portion of the saddle and a stopper pin coupled to the body by interference fit is inserted into the groove to limit the moving distance of the saddle so that separation of the saddle is prevented. And the front surface of the saddle is machined by fastening the adapter to increase the working range, A remarkable effect can be further increased up.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 2 is an exploded view
Figures 3 and 4 illustrate a partially separated configuration of the present invention
Figure 5 is a partial perspective view of the present invention.
Figure 6 is a partial perspective view of the present invention.
Fig. 7 is a perspective view of a saddle according to the present invention
Fig. 8 is a cross-sectional view
Fig. 9 is a view showing the state of use

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

3 is a partial perspective view of the present invention, FIG. 5 is a partial perspective view of the present invention, FIG. 5 is a perspective view of the present invention, FIG. 6 is a perspective view of a part of the present invention, and FIG. 7 is a perspective view of a saddle according to the present invention, wherein a boring bar extending the working range according to the present invention is a boring bar for machining an inner diameter and an outer diameter of a work, A body 10 integrally formed with a shank 11 mounted on a tool holder of a machine tool, a boring head 40 coupled to a saddle engaging groove 12 formed in the body 10 and for cutting a workpiece, And a dial (20) for moving the saddle (30) to move the saddle (30).

First, the shank 10 refers to a bag mounted on a tool holder of a machine tool, and the tool holder is mounted on a tool stand of a machine tool, which may be a spindle (main shaft) through which rotational power of the machine tool is transmitted , Or a general tool stand in which no rotational power is transmitted when the workpiece is rotated, or a turret tool stand.

The body 10 is integrally formed with the shank 11. The body 10 and the shank 11 are separately formed and then the body 10 and the shank 11 are screwed . It is possible to make the body 10 or the shank 11 different in length or diameter to be used for various tool holders.

The saddle fastening groove 12 is formed in the body 10 so as to communicate with a seat groove 18 which will be described later, A saddle 30 is fastened to the saddle fastening groove 12, and a boring head 40 for cutting the workpiece is fastened to the saddle.

The position of the saddle 30 is shifted by the dial 20 coupled with the shaft bolt 31 formed on one side of the saddle 30.

The shaft bolt 31 is screwed into the boss portion 22 of the dial 20 and the boss portion 31 is screwed into the boss portion 22 of the dial 20. The shaft bolt 31 is formed integrally with one side of the saddle 30, The saddle 30 is rotated by the bearing 23 so that the saddle 30 is rotated when the dial 2 is rotated so that the saddle 30 can not be rotated while being fastened to the body. 31 in the direction of the rotation center axis.

The saddle 30 and the shaft bolt 31 are formed integrally with each other and may be separately formed and the shaft bolt 31 is protruded so as to have a certain diameter at the center of the saddle 30 And a screw is formed on the outer surface. A screw to be engaged with the screw of the shaft bolt 31 is formed in the boss portion 22 of the dial 20 so that the shaft bolt 31 and the boss portion 22 of the dial are screwed to each other. Therefore, when the boss 22 rotates, the saddle 30 must be rotated in a state where no external force is applied to the saddle 30, but the saddle 30 is not rotated in the saddle engaging groove 12 The axial bolt 31 is moved in the direction of the axis of rotation of the axial bolt 31 along the thread of the boss portion 22 in accordance with the rotation of the boss portion 22.

3, a side of the body 10, that is, a side opposite to the side where the saddle fastening groove 12 is formed, is provided with a seat groove 18 at a predetermined depth And the bearing 23 is fixedly coupled to the seat groove 18 in an interference fit manner and the boss portion 22 of the dial 20 is fixedly coupled to the inner ring of the bearing 23 in an interference fit manner . That is, the outer ring of the bearing 23 is fixed to the seat groove 18 in an interference fit manner, and the inner ring is fixed to the boss portion 22 of the dial in an interference fit manner, so that the dial 20 is rotated by the bearing And is fixed to the body 10 as much as possible.

Therefore, when the dial 20 rotates, the boss portion 22 is also rotated so that the axial bolt 31 of the saddle 30 engaged with the thread formed on the boss portion 22 is moved.

The dial 20 is composed of a head portion 21 on which a graduation is formed and a boss portion 22 on the inner circumferential surface of which a screw is formed. In the upper portion of the seat groove 18, a part of the outer surface of the body is chamfered, By showing the distance of the birds being moved per eye of the dial in the part, the user can easily grasp the moving distance of the birds.

When the saddle 30 is moved by the dial 20 and reaches an appropriate position, the saddle 30 can be fixed using a set screw 24 threaded through one side of the body 10 The outer surface of the saddle 30 which meets the end surface of the set screw 24 at this time is a chamfered portion 36 which is chamfered in a plane of an appropriate width so that the close contact area with the end surface of the set screw 24 is widened, 30 are improved.

If the saddle 3 continues to move outwardly from the saddle engagement groove 12, the screw connection between the shaft bolt 31 and the boss 22 can be released and separated, (16) is fixedly coupled to the body.

5, the saddle 30 has a recess 32 formed on an upper portion of the saddle 30 opposite to the side where the boring head engagement groove 35 is started. A stopper pin 16 is inserted into the recess 32 And one side of the stopper pin 16 is kept in contact with the outer surface of the groove 32 at all times so that the saddle 30 is moved in the clockwise direction with respect to the center axis of the saddle 30, Or counterclockwise movement.

A guide pin 17 is fitted to one side of the body separately from the stopper pin 16. A part of the guide pin 17 is fitted in the slot 33 formed in the saddle 30, And at the same time serves to guide the movement of the saddle 30.

A boring head coupling groove 35 is formed on the bottom surface of the saddle 30 so that the boring head 40 can be inserted into the saddle 30. The boring head coupling groove 35 is cylindrical, The boring head 40 is fastened.

The boring head 40 is constituted by a shank portion 41 having a cylindrical shape and a head portion 42 in the form of a hexahedron block so as to be engaged with the shape of the boring head engaging groove 35. In the head portion 42, A tip engaging groove 43 is formed and a cutting tip 44 having a triangular cross section is fastened to the cutting tip engaging groove 43 by a bolt so that the cutting tip can be replaced if necessary during use.

The boring head 40 is fixed to the saddle 30 by the fixing bolt 39 which is inserted into the boring head coupling groove 35. The shank portion 41 of the boring head 40 is provided with a shank portion 41 The shank portion 41 is pushed into the inside of the boring head engaging groove 35 when the boring head 40 is fixed by the fixing bolt 39 So that the end face of the shank portion 41 and the end face of the boring head fastening groove 35 are brought into close contact with each other to increase the fastening force of the boring head 40 and bring the fastening position of the boring head 40 constant .

When the head portion 42 is chamfered by the surface of the shank portion 41 of the boring head 40 parallel to the central axial surface of the shank portion 41, The fastening force is increased and the boring head can always be fastened to a fixed position only when the fastening bolt 39 is tightened while maintaining the state of being in tight contact with the end surface of the boring head 35. This fixing operation of the boring head 40 is very inconvenient And its precision can not be guaranteed. Therefore, the inclined face mounting portion 45 chamfered so that a part of the shank portion 41 is sloped causes the shank portion 41 to move toward the inside of the boring head locking groove 35 as the fixing bolt 39 is tilted due to the inclined surface thereof So that the boring head 40 can be always fixed at a predetermined position, and the fastening force can be further increased.

This effect, that is, the high tightening force of the boring head 40 prevents the shaking of the boring head 40, thereby improving the surface roughness of the work.

7, the boring head 40 is fixed by a fixing bolt 39 fastened to a bolt hole 37 formed in the front surface of the saddle 30, The engaging groove 35 is formed in a state of being eccentric by a predetermined amount from the center axis of the saddle 30 so that the thickness of the cutting tip 44 fastened to the boring head 40 can be made thick In the case of a configuration that is immediately visible, a leader line is indicated by a solid line, and in the case of a configuration that is not immediately visible but inside, a leader line is indicated by a hidden line.

That is, in the case of a boring bar, when the cutting tip 44 is fastened, the top surface of the cutting tip 44, that is, the first contact surface of the cutting tip 44 for cutting the workpiece is equal to the horizontal or vertical center axis of the boring bar The thickness of the cutting tip 44 can not be made thick if the boring head coupling groove 35 is formed so as to be centered at the same position as the horizontal or vertical central axis of the boring bar. The depth of the cutting tip engaging groove 43 formed in the head portion 42 must be deepened to accommodate the relatively thick cutting tip so that the cutting tip engaging groove 43 of the head portion 42 can be made thinner, The thickness of the formed portion is inevitably thinned and the strength is lowered.

Therefore, the thickness of the head portion 42 can be made thick even if the boring head engaging groove 35 is formed to be eccentric by a predetermined amount from the center axis of the saddle 30 and the thickness of the cutting tip 44 is increased As a result, the strength of the boring head can be increased. The center axis refers to the horizontal center axis C _H and the horizontal center axis C _{V of the} saddle. In some cases, the boring head fastening groove 35 and a fastening bolt hole 37 may be formed.

4 and 6, the adapter 50 may be fastened to the saddle 30 in order to increase the working range. The adapter 50 is fastened to the saddle 30 by fastening bolts 51 And the position guide pin 54 fixedly coupled to the adapter 50 is fitted into the guide groove 38 formed in the saddle 30 so that the fastening position of the adapter 50 can be always kept constant .

That is, since the adapter 50 is fixed to the front side of the saddle by the fastening bolt 51, the distance between the adapter 50 and the center axis of the body is relatively long, and thus the adapter 50 can be used for machining a workpiece having a relatively large inner diameter. 50) is not used, it can be separated and used only when necessary.

The position guide pin 54 of the adapter 50 is inserted into the guide groove 38 formed in the saddle 30 so that the adapter 50 is always separated from the adapter 50 50 can be coupled to the saddle 30, so that the machining precision for the workpiece can be kept constant.

The coupling surface of the adapter 50 is formed to have a curvature equal to the curvature of the saddle 30 so that the saddle 30 and the adapter 50 Are coupled to each other with the same curvature, so that the fastening force is increased.

It is preferable that the front surface of the saddle 30 is formed to have the same or similar curvature as that of the body and the coupling surface of the adapter 50, that is, the surface on which the position guide pin 54 is inserted, So that the curved surface and the curved surfaces are brought into contact with each other to increase the contact area.

8 is a cross-sectional view of the present invention in which the length of the head portion 62 of the boring head 60 is longer than that of the boring head 40 described above so that it can be used for boring processing of a workpiece having a larger inner diameter will be.

That is, the end portion of the head portion 62 of the boring head is formed to be farther away from the central axis of the shank portion 61, and such a boring head can be used for machining a workpiece having a larger inner diameter.

Thus, the present invention can alternately use three boring heads: the boring head 40 shown in Figures 2 and 4, the boring head 60 shown in Figure 8, and the adapter 50 shown in Figure 4 The boring head 40 reciprocates along with the saddle 30 in the direction of the arrow as shown in FIG. 9, so that the size of the inner diameter that can be cut can be finely adjusted have.

As a result, the boring bar extending the machining range according to the present invention is constructed so that the saddle can be inserted into the body, and the saddle is fastened to the saddle with a boring head fixedly coupled with a cutting tip for cutting the workpiece, The inner diameter of the workpiece can be precisely adjusted by adjusting the position of the cutting tip finely relative to the center axis of rotation of the body and the effect of being universally applicable to various workpieces having different inner diameter dimensions In addition, a groove is formed in the upper portion of the saddle, and a stopper pin coupled to the body by interference fit is inserted into the groove to limit the moving distance of the saddle, thereby preventing separation of the saddle. And an adapter is fastened to the front surface of the saddle to increase the machining range There is a remarkable effect that the machining range can be further increased.

10; Body
11. Shank 12. Saddle fastening groove 13, 14. Pinhole
15. Racking part 16. Stopper pin 17. Guide pin
20; dial
21. Head part 22. Boss part
23. Bearing 24. Set Screw
30; Saddle
31. Bolt Bolt 32. Groove 33. Longitudinal Groove
34. Bolt hole 35. Boring head fastening groove 36. Face mounting
37. Bolt hole 38. Position guide groove 39. Fixing bolt
40; Boring head
41. Shank portion 42. Head portion 43. Cutting tip fastening groove
44. Cutting tip 45. Slope mounting
50; adapter
51. Fastening bolt 52. Cutting tip fastening groove 53. Cutting tip
54. Locating pin
60; Boring head
61. Shank portion 62. Head portion 63. Cutting tip fastening groove
64. Cutting tip 65. Slope mounting

Claims

In a boring bar for machining an inner diameter or an outer diameter of a workpiece,
The boring bar includes a body 10 integrally formed with a shank 11 mounted on a tool holder of a machine tool and a boring head 12 coupled to the saddle engaging groove 12 formed in the body 10 for cutting the workpiece And a dial (20) for moving the saddle (30), wherein the saddle (30)
Wherein the saddle (30) has a boring head fastening groove (35) in which a boring head (40) can be fitted.

The method according to claim 1,
A shaft bolt 31 having a screw thread is integrally formed at one side of the saddle 30 and the shaft bolt 31 is screwed to the boss 22 of the dial 20, The saddle 30 which can not be rotated when the dial 2 is rotated is also rotated by the rotation of the dial 2 so that the saddle 30 can be rotated by the shaft bolt 31, In the direction of the axis of rotation of the boring bar.

The method according to claim 1,
The saddle 30 is formed with a groove 32 on the upper side opposite to the side where the boring head engaging groove 35 is started and a stopper pin 16 is inserted in the groove 32, Boring bar which extended the processing range which is limited by the limitation.

delete

The method according to claim 1,
The shank portion 41 of the boring head 40 is chamfered so that a part of the shank portion 41 is inclined so that when the boring head 40 is fixed by the fixing bolt 39 The shank portion 41 is pushed into the inside of the boring head fastening groove 35 so that the end face of the shank portion 41 and the end face of the boring head fastening groove 35 are brought into close contact with each other, And the boring head 40 can be held in a fixed position.

The method according to claim 1,
The boring heads 40 and 60 are fixed by a fixing bolt 39 fastened to a bolt hole 37 formed in the front surface of the saddle 30 and the bolt hole 37 and the boring head fastening groove 35 The saddle 30 is formed in a state of being eccentric by a predetermined amount from the central axis of the saddle 30 so that the thickness of the cutting tip 44 to be fastened to the boring heads 40 and 60 can be increased to increase the strength, .

The method according to claim 1,
And an adapter (50) can be fastened to the front surface of the saddle (30) to increase the machining range.

6. The method of claim 5,
The adapter 50 is fixedly coupled to the saddle 30 by a fastening bolt 51. The position guide pin 54 fixedly coupled to the adapter 50 is inserted into the guide groove 38 formed in the saddle 30, So that the fastening position of the adapter 50 can always be constantly maintained.

6. The method of claim 5,
The saddle 30 and the adapter 50 are formed so that the coupling surface of the adapter 50 has a curvature equal to the curvature of the saddle 30, Boring bar extends the machining range, which is characterized in that the surfaces having the same curvature are joined together to increase the clamping force.