KR101774976B1

KR101774976B1 - Burnishing tool

Info

Publication number: KR101774976B1
Application number: KR1020150125072A
Authority: KR
Inventors: 동영근
Original assignee: 동영근
Priority date: 2015-09-03
Filing date: 2015-09-03
Publication date: 2017-09-05
Also published as: KR20170028167A

Abstract

The present invention discloses a burnishing tool for a hole surface treatment capable of improving workability by machining a hole formed in a workpiece with a single tool without replacing the tool when boring and burnishing . The disclosed burnishing tool for hole treatment has a plurality of cutting edge portions spaced apart from each other along the circumferential direction of the distal end surface so as to have a specific entry angle at a tip end face inserted into a hole of a workpiece, A burnishing portion which is formed on the center line of the boring portion so as to have a diameter smaller than the diameter of the boring portion and in which a burnishing portion for burnishing the inner surface of the hole is protruded and formed; And the shank portion.

Description

[0001] BURNISHING TOOL FOR HOUSING &

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a burnishing tool for a hole surface treatment, and more particularly, to a burnishing tool for a hole surface treatment, So as to improve the quality of the burnishing tool.

Normally, boring is a method of finishing the inner surface of a hole formed in a workpiece and widely used in industry. This boring operation can be carried out using a boring machine, a milling machine, a general purpose machine, and the like, and is particularly applied to the production of automobile parts.

For example, a universal joint is used as a cuff ring to connect two power transmission shafts to a vehicle's power transmission system. The universal joint is connected by a joint block with two yokes coupled to the drive shaft.

And, the joint block should be smoothly worked on the inner surface of the hole formed for engagement of the bearings. For this purpose, a hole is formed in the joint block through milling or the like, boring is performed on the inner surface of the hole, and then burnishing is performed to finely process the inner diameter of the finished hole. Here, burnishing refers to a polishing process in which the inner surface of the hole is smoothed so as to have a gloss.

However, if the boring operation and the burnishing operation are performed as described above, the work flow increases, and it is difficult to precisely match the center of rotation of the tool due to the operation change, resulting in a problem that the machining error is seriously generated.

Therefore, there is a need to improve this.

On the other hand, Korean Patent Laid-Open Publication No. 10-2008-0052568 (published on June 11, 2008) discloses "a method of machining a hole machining tool and a preliminary hole ", and Japanese Unexamined Patent Application Publication No. 10-2011-0066485 (Published on June 17, 2011), a "tool capable of skiing and burnishing" is disclosed.

The present invention is created by the above-mentioned necessity, and it is possible to reduce the defect rate while reducing the number of workings by boring and burnishing the holes formed in the workpiece with one tool without replacing the tool The present invention provides a burnishing tool for treating a hole surface.

According to an aspect of the present invention, there is provided a burnishing tool for a surface treatment of a hole, the burnishing tool comprising a plurality of holes formed in a circumferential direction of the tip end face so as to have a specific entry angle A boring part for boring the inner surface of the hole; A burnishing portion extending on a center line of the boring portion to have a diameter smaller than a diameter of the boring portion and having a burnishing portion for burnishing an inner surface of the hole; And a shank portion extending from the burnishing portion to have a smaller diameter than the burnishing portion.

The machining blade portion may include a main cutting edge having a main entering surface inclined at the end surface and forming a main machining surface extending toward the outer surface of the burnishing portion; And a shearing blade having an auxiliary entry surface inclined at the front end surface so as to be positioned at a front end of the main entry surface and forming an auxiliary working surface leading to the outer surface of the burnishing portion so as to be located at the front end of the main working surface .

Further, the main machining surface forms an outer surface of the main cutting edge, and is formed in a "?" Shape through the first machining surface and the second machining surface.

In addition, the burnishing portion may protrude from the outer surface of the burnishing portion in a trapezoidal shape, and may have a round finishing surface.

The boring portion may further include a chip discharge groove portion formed between the processing blade portions for discharging cutting chips of the workpiece.

The burnishing unit may further include a non-contact outer surface portion having a diameter smaller than the diameter of the boring portion and formed between the burnishing protrusions.

As described above, according to the burnishing tool for hole treatment according to the present invention, unlike the conventional art, holes formed in a workpiece can be continuously boring and burnishing with a single tool without replacing the tool. Therefore, it is possible to reduce the defect rate of the product while reducing the work flow.

1 is a plan perspective view showing a burnishing tool for a hole treatment according to an embodiment of the present invention.
2 is a bottom perspective view showing a burnishing tool for a hole treatment according to an embodiment of the present invention.
3 is a side view showing a burnishing tool for a hole treatment according to an embodiment of the present invention.
4 is a bottom view showing a burnishing tool for a hole treatment according to an embodiment of the present invention.
FIG. 5 is an enlarged view of a portion showing a boring unit according to an embodiment of the present invention. FIG.
6 is an enlarged cross-sectional view showing the burnishing portion according to an embodiment of the present invention.
7 is a perspective view showing a modified example of the burnishing portion according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a burnishing tool for a hole treatment according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

2 is a bottom perspective view showing a burnishing tool for a hole treatment according to an embodiment of the present invention. FIG. 3 is a plan view of the burnishing tool for a hole treatment in accordance with an embodiment of the present invention. 4 is a bottom view of a burnishing tool for a hole treatment according to an embodiment of the present invention.

6 is an enlarged cross-sectional view showing a burnishing portion according to an embodiment of the present invention, and Fig. 7 is a cross-sectional view of a burning portion according to an embodiment of the present invention. 1 is a perspective view showing a modified example of the burnishing portion according to the embodiment.

1 to 6, the burnishing tool 10 for a hole treatment according to an embodiment of the present invention is used for boring and burnishing an inner surface of a hole formed in a workpiece . For example, in the burnishing tool 10 for a hole treatment according to the present embodiment, an inner surface of a bearing engagement hole 1a formed in a joint block 1 as a workpiece is subjected to a boring process and a burnishing process So that processing can be continuously performed.

For this purpose, the burnishing tool 10 for the hole treatment includes a boring portion 20 for boring the bearing engagement hole 1a, and a burnishing portion 20 for polishing the inner surface of the boring- A shing portion 30, and a shank portion 40 for installation in a machine tool. Since the boring unit 20 and the burnishing unit 30 are integrally formed in the burnishing tool 10 for a hole treatment, the bearing engaging hole 1a can be boring and burnished It is possible to reduce the defect rate of the product while reducing the work flow.

The boring portion 20 has a front end face 20a to be inserted into the bearing engagement hole 1a of the joint block 1, a processing blade portion 20b extending from the front end face 20a, And a chip discharge trench 20c formed in the chip. The boring portion 20 extends to the burnishing portion 30 with a helical shape along the axial direction of the burnishing tool 10 for the hole treatment.

The front end face 20a is formed in a plane, and the cutting edge 20b is formed so as to have a specific entering angle.

A plurality of cutting blade portions 20b are formed so as to be spaced apart from each other in the circumferential direction of the burnishing tool 10 for the hole finishing and the inner surface of the bearing engaging hole 1a while entering the bearing engaging hole 1a of the joint block 1 . For this purpose, the machining blade portion 20b includes a main cutting edge 21 for boring of the bearing engagement hole 1a and a front end cutting edge 23 located at the front end of the main cutting edge 21.

The main cutting edge 21 has a main entrance surface 21a inclined at the front end surface 20a so as to have a front end surface 20a and a specific entry angle 1 and a main entrance surface 21a inclined at the main entrance surface 21a at the burnishing portion 30 And a main machining surface 21b formed so as to be separated from the burnishing portion 30 by a step 21c.

Although the main entrance surface 21a is shown as being planar so as to form a specific entry angle with the front end surface 20a in the present embodiment, the main entrance surface 21a may be rounded from the front end surface 20a .

The main machining surface 21b is formed in the shape of "∧" through the first machining surface 21b 'and the second machining surface 21b "to form the outer surface of the boring portion 20. Further, The portion of the second processing surface 21b that is in contact with the burnishing portion 30 protrudes step by step from the burnishing portion 30 and the front end cutting edge 23 is located at one side of the first processing surface 21b ' The chip discharge groove 20c is located at one side of the chip discharge groove 21b ".

The front end cutting edge 23 has an auxiliary entry surface 23a extending from the main entry surface 21a and an auxiliary working surface 23b forming the outer surface of the auxiliary entry surface 23a. The shearing blade 23 is formed such that the auxiliary entry surface 23a is formed smaller than the main entry surface 21a and the auxiliary working surface 23b is in contact with the first working surface 21b ' . At this time, the width of the auxiliary working surface 23b gradually increases from the auxiliary entry surface 23a toward the burnishing portion 30, and a portion in contact with the burnishing portion 30 protrudes stepwise from the burnishing portion 30 .

The boring portion 20 according to this embodiment may be formed to have a helical angle? 2 with the axial direction of the burnishing tool for hole treatment to be in the range of 0 to 45 degrees, .

The burnishing portion 30 is formed to extend over the center line of the boring portion 20 so as to have a diameter? 2 smaller than the diameter? 1 of the boring portion 20. The burnishing portion 30 has a burnishing protrusion 31 for burnishing and a contactless outer surface portion 33 formed between the burnishing protrusion 31 so as to have a diameter smaller than the diameter of the boring portion 20, Respectively. That is, in the burnishing portion 30, the burnishing protrusion 31 protrudes from the outer surface of the non-contact outer surface portion 33.

The burnishing portion 30 is formed in such a manner that the burnishing portion 31 is inserted into the bearing engaging hole 1a subjected to the surface treatment by the boring portion 20 and the inner surface of the bearing engaging hole 1a is smoothly polished .

The burnishing protrusions 31 protrude from the outer surface of the non-contact outer surface portion 33 in the form of a helix, and a plurality of the burnishing protrusions 31 are formed at regular intervals along the circumferential direction of the burnishing portion 30. The burnishing protrusion 31 is formed such that the helix angle 2 is in the range of 10 to 15 degrees with respect to the axial direction of the burnishing portion 30. [

Particularly, the burnishing protrusion 31 is formed so as to have a trapezoidal shape, and a round surface 31a for burnishing is formed more effectively on both sides of the end portion. Further, a coating layer 31b is formed in the burnishing projection 31 to further improve the gloss effect of the burnishing surface.

In this embodiment, the helix direction of the burnishing projection 31 may be formed in the opposite direction to the helix direction of the boring portion 20 or in the same direction. Further, as shown in Fig. 7, the burnishing protrusion 31 may be formed in a straight line.

The shank portion 40 is extended from the burnishing portion 30 so as to be fixed to the fixing chuck of the machine tool and has a diameter smaller than the diameter of the burnishing portion 30. [

The operation of the burnishing tool for a hole treatment according to an embodiment of the present invention will be described.

The bearing engaging hole 1a of the joint block 1 as a work piece is inserted into the bearing engaging hole 1a so as to be boring and burnishing, and the inner surface of the bearing engaging hole 1a is subjected to surface treatment. For this purpose, the burnishing tool 10 for the hole treatment has a boring portion 20 inserted into the bearing engagement hole 1a to finish the inner surface, and the burnishing portion 30 is continuously inserted into the finished inner surface, The burnishing process is performed in which the inner surface of the bearing engagement hole 1a is polished.

At this time, when the boring portion 20 is inserted into the bearing engagement hole 1a by the main entrance surface 21a, the boring portion 20 is stabilized and inserted easily while minimizing the radial flow.

In addition, since the round surface 31a is formed on the burnishing projection 31 of the burnishing portion 30 and the coating layer 31b is formed on the outer surface of the burnishing portion 31, the gloss effect can be further improved.

Since the boring unit 20 and the burnishing unit 30 are integrally formed in the burnishing tool 10 for a hole treatment according to the present embodiment, boring of the bearing engaging hole 1a and burnishing Processing can be continuously performed. As a result, it is possible to reduce the defect rate of the product while reducing the work flow, and the production cost can be remarkably reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.

Accordingly, the true scope of protection of the present invention should be defined by the claims.

10: burnishing tool for hole treatment 20:
20b: cutting blade part 21: main cutting blade
23: Shearing blade 20c: Chip discharge groove
30: burnishing portion 31: burnishing portion
40: Shank

Claims

And a plurality of machining blade portions spaced apart from each other along the circumferential direction of the distal end surface so as to have a predetermined entering angle on a distal end surface of the workpiece to be inserted into the holes of the workpiece, wherein the boring portion boring the inner surface of the hole; A burnishing portion extending on a center line of the boring portion to have a diameter smaller than a diameter of the boring portion and having a burnishing portion for burnishing an inner surface of the hole; And a shank portion extending from the burnishing portion to have a smaller diameter than the burnishing portion,
Wherein the machining blade portion has a main machining surface having a main entrancing surface inclined at the end surface and forming a main machining surface extending toward the outer surface of the burnishing portion; A shearing blade having an auxiliary entry surface inclined at the front end surface so as to be located at a front end of the main entry surface and forming an auxiliary working surface leading to the outer surface of the burnishing portion so as to be located at the front end of the main working surface; / RTI >
The main cutting edge further comprises a main entrance surface formed to be inclined at a front end surface of the boring portion,
Wherein the main machining surface is formed in a "?"Shape through the first machining surface and the second machining surface and extends from the main entrance surface to the burnishing portion,
Wherein the shearing blade further comprises an auxiliary entry surface extending from the main entry surface.

delete

The method according to claim 1,
Wherein the burnishing portion is protruded from the outer surface of the burnishing portion in a trapezoidal shape and has a rounded finish surface.

5. The method of claim 4,
Wherein the boring portion further includes a chip discharge groove portion formed between the processing blade portions for discharging cutting chips of the workpiece,
Wherein the burnishing portion has a diameter smaller than a diameter of the boring portion and further includes a non-contact outer surface portion formed between the burnishing protrusions.