KR20160086237A

KR20160086237A - a cutting tool available of back counter-boring

Info

Publication number: KR20160086237A
Application number: KR1020150006605A
Authority: KR
Inventors: 조희근
Original assignee: 조희근
Priority date: 2015-01-09
Filing date: 2015-01-09
Publication date: 2016-07-19

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back counter boring tool, and a back counter boring tool according to the present invention is a tool for a back counter boring tool which forms an enlarged seating part on a back surface of a through hole, A support base vertically protruding from a center of the body at an eccentric position proportional to the size of the through hole and having an elliptical cross section whose short axis is oriented toward the center of the body; and a cutting surface perpendicular to the long axis of the support base, And a reference surface formed on the outer circumferential surface of the body so as to be horizontal to the longitudinal axis of the support.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back counter boring process, and more particularly, to a back boring tool capable of easily performing a back counter-boring process in which an object to be processed is formed on a side opposite to a spindle side.

A back boring operation, a back counter-boring operation, a back counter sinking operation, a machining surface exists on the rear surface of the object to be processed, that is, on the opposite side of the spindle axis on which the tool is installed.

1 is a conceptual cross-sectional view showing an object to be processed which requires back counter boring.

A milling and drilling tool is generally provided on the opposite side of the work table 10 on which the object 1 to be processed is placed and the back counter boring is provided to form the seating part 3 on the rear surface where the through hole 2 is formed .

Of course, the object to be processed 1 may be reversed after forming the through hole, but this back counter boring is used when the working time and the process are increased and the boring process is impossible on the opposite side of the object to be processed .

Prior art relating to such boring processing includes Application Nos. 10-2011-0014030 and 10-1999-0010738 filed in the Korean Intellectual Property Office.

However, such a conventional boring tool requires a separate fastening process (Patent Application No. 10-2011-0014030), and it has a problem in that it is difficult to manufacture due to the structural problem, and it is difficult to form a sufficient seating portion due to a problem of strength. -1999-0010738)

The object of the present invention is to provide a tool for back counter boring which is easy to manufacture and has sufficient strength.

A back counter boring tool according to the present invention is a tool for a back counter boring tool for forming an enlarged seating part on the back surface of a through hole, the tool for boring a back counter comprising: a cylindrical body fixed to a machining device; A support which is vertically protruded in a relatively eccentrically located position and has an elliptical cross section whose short axis is directed toward the center of the body; a cutting part which is formed to protrude perpendicular to the longitudinal axis of the support at the end of the support, And a reference surface formed horizontally on a longitudinal axis of the support on the outer circumferential surface of the body, wherein a sum of a length (2d) of the minor axis of the support and a protruded length (h) of the cut surface is greater than a size (2R) .

Here, the cutting portion is characterized in that the insert tip is fixed.

The back counter boring tool according to the present invention is advantageous in that it is possible to provide a tool for back counter boring which is capable of machining a seating part on the opposite side of the machining surface while having sufficient strength.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a conceptual sectional view showing an object to be processed which requires back counter boring. Fig.
2 is a perspective view showing a tool for a back counter boring according to a preferred embodiment of the present invention.
3 is a perspective view showing a tool for a back counter boring according to another preferred embodiment of the present invention.
4 is a conceptual diagram illustrating the operation of a tool for boring a back counter according to a preferred embodiment of the present invention.

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

2 is a perspective view showing a tool for a back counter boring according to a preferred embodiment of the present invention.

2, a back counter boring tool according to the present invention is used to form an enlarged seating portion on the back surface of a through hole and includes a body 100, a support 110, a cutting portion 120, 112).

First, the cylindrical body is fixed to a machining apparatus such as a machining center, a drilling machine, and a milling machine, and a reference surface 112 is formed on the outer circumferential surface. Such reference planes will be described later.

Next, the support base 120 vertically protrudes from the center of the body 100 at an eccentric position d in proportion to the size of the through-hole processed.

Here, the support 1200 is positioned such that the minor axis of the elliptical cross-section faces the center of the body 100. The cutter 120 is protruded perpendicularly to the longitudinal axis of the support at the end of the support 110, A face is formed at the lower portion to process the seating portion.

The elliptical cross-sectional structure of such a support is designed to increase the strength of supporting the cutting portion while preventing contact with the through hole in the through-hole passing process of a tool to be described later.

Next, the cutting surface will be described in detail.

FIG. 4 is a conceptual diagram illustrating the operation of a tool for a back counter boring according to a preferred embodiment of the present invention.

4, the cutting surface 122 is machined between the through hole S1 and the outer surface S2 of the seating portion to form a seating portion, and is protruded in a direction perpendicular to the long axis of the elliptical cross section of the support base.

Since the eccentric distance d, that is, the supporter is moved horizontally by an eccentric distance with respect to the center O of the through-hole, the supporter and the cutting portion pass through the through hole And moves the center of the tool to the opposite position of the eccentric position when passing through the center of the through hole again (position C shown in Fig. 4).

During the movement of the tool, the sum of the length (2d) of the short axis of the support and the protruded length (h) of the cutting surface must be smaller than the size (2R) of the through hole.

Then, the cutting surface 122 of the cutting portion is machined to the seating portion by rotating the tool backward while rotating the tool.

In this case, since the direction in which the cutting portion is vertically protruded from the support and the direction in which the support is eccentric are the same direction, the reference direction of the horizontal movement direction should be presented so that interference does not occur during the passage of the tool through the through hole.

That is, in the process of installing the tool for back-corner boring according to the present invention, the reference surface is accurately grasped and the horizontal movement direction of the tool is determined through the reference surface.

Another embodiment will be described.

3 is a perspective view showing a tool for a back counter boring according to another preferred embodiment of the present invention.

The embodiment shown in FIG. 3 can extend tool life over the embodiment shown in FIG. 2 by fixing the insert tip 130 to the cutting portion 120. That is, as the machined surface of the insert tip 130 is damaged, only the insert tip needs to be replaced, thereby preventing loss due to the replacement of the entire tool.

As described above, according to the present invention, it is a principal technical idea to provide a tool for back-corner boring, and since the above-described embodiments are only one example with reference to the drawings, the true scope of the present invention is not limited to Should be determined.

100: Body
110: Support
112; Reference plane
120:
122: cutting face
130: insert tip

Claims

A back counterboring tool for forming an enlarged seating portion on a rear surface of a through hole,
A cylindrical body fixed to the processing apparatus;
A support vertically protruding from a center of the cylindrical body at an eccentric position proportional to the size of the through hole, the minor axis having an elliptical cross section facing the center of the body;
A cutting portion protruding perpendicularly to a longitudinal axis of the support at an end of the support and having a cutting surface formed at a lower portion thereof;
And a reference surface formed on an outer circumferential surface of the body horizontally at a long axis of the support,
Wherein the sum of the length (2d) of the minor axis of the support and the protruded length (h) of the cutting surface is smaller than the size (2R) of the through-hole.

The method according to claim 1,
The cutting portion
Wherein the insert tip is fixed.