WO2008004740A1

WO2008004740A1 - Burr-removing device

Info

Publication number: WO2008004740A1
Application number: PCT/KR2007/000835
Authority: WO
Inventors: Kwon Hee Kim; Chang Hee Cho; Ki Ha Lee
Original assignee: Kwon Hee Kim; Chang Hee Cho; Ki Ha Lee
Priority date: 2006-07-04
Filing date: 2007-02-16
Publication date: 2008-01-10
Also published as: KR100715291B1

Abstract

The present invention provides a burr-removing device 100 which can efficiently remove burrs on an intersecting hole H2, which is difficult to access to, without over-cutting problem.

Description

TITLE OF THE INVENTION

Burr-removing device

FIELD OF THE INVENTION

The present invention relates to a burr-removing device and, more particularly, to a burr-removing device suitable to remove burrs around the exit edge of a hole intersecting the primary hole at an angle.

BACKGROUND

Burrs are unwanted irregular projections around the holes formed by drilling. During drilling, a drill bit is rotated and pushed into the material. The material at the tip of the drill bit undergoes intensive deformation with heating and is cut into chips. When the drill bit proceeds and exits the material, the intense material deformation with heating at the tip of the drill bit produces significant burrs around the exit edge of the hole. The material at the tip of the drill bit is highly ductile due to friction heating and thus is easily pushed out of the hole without fracturing off the material. This phenomenon is more pronounced when the material is ductile and the drill bit is dull. Burrs can be formed even around the entrance side of the drilled hole when the drill bit is dull.

Fig. 1 shows burrs generated on an intersecting edge of a primary hole Hl and a secondary hole H2 which intersect each other. The primary hole Hl is firstly processed and then, the secondary hole H2 intersecting the primary hole Hl is processed.

In this case, the generation of the burrs is focused on the positions at which the drill bit exits the material during drilling the secondary hole H2.

With reference to Fig. 1, the burrs are crowded on the left and lower part with respect of the secondary hole H2. This is because the drill bit is rotated counterclockwise when viewed from the entrance of the hole H2 and the material is pushed off the hole when the drill bit exits the material at the left lower part of the secondary hole H2.

Generally, these burrs are removed by a cutter mounted on a drilling machine. That is, the cutter is passed through the secondary hole H2 and positioned on the intersecting edge of the primary hole Hl and the secondary hole H2. Then, the cutter is turned and the turning cutter removes the burrs.

In this case, it is necessary to feed the cutter in some distance along the shaft direction while turning the cutter at the same time if the intersecting edge forms a 3-dimensional curvature .

In this regards, it may be difficult to remove the burrs on the surface of an intersecting hole where two holes intersect each other and, especially, it maybe more difficult if the intersecting hole has a relative angle.

That is, as shown in Fig. 1, when the secondary hole H2 intersects the primary hole Hl at an angle, to remove the burrs b on the intersecting edge of the primary hole Hl and the secondary hole H2, the cutter is inserted through the secondary hole H2 and projected out from the surface, and turned.

In this case, the intersecting edge of the primary hole Hl and the secondary hole H2 forms the 3-dimensional curvature and the cutter is in contact with the inside of the primary hole

Hl or the secondary hole H2 as well as the burr b. Accordingly, there may be excessive cutting during the removal of the burrs near the intersecting edge of the primary hole Hl and the secondary hole H2 and this over-cutting will happen more seriously if the difference of the diameter between the primary hole Hl and the secondary hole H2 is smaller or the intersecting angle between the axes of the primary hole Hl and the secondary hole H2 is more displaced from 90 degree.

Therefore, a burr-removing device which can remove the burrs on the intersecting hole, which is difficult to access to, without the over-cutting problem is demanded. The present invention satisfies the demand.

DISCLOSURE

TECHNICAL PROBLEM

The purpose of the present invention is to provide a burr-removing device which can efficiently and smoothly remove burrs on an intersecting hole, which is difficult to access to, without the over-cutting problem. TECHNICAL SOLUTION

To accomplish the above-mentioned purpose, the present invention provides a burr-removing device for removing burrs on an intersecting edge of two holes which intersects each other, the burr-removing device comprising: abodypart; a cutter part; a connecting part which connects the body part and the cutter part; wherein the cutter part is mounted on an endof the connecting part to be distanced from the line extended from the central axis of the body part; and the cutter part includes a base; a first and a second protrusions which extend from the both side of the base, respectively and the upper portion of which has convex round shape; wherein the first and the second protrusions are formed to be parallel each other with an angle inclined from the direction extended along the connecting part from the body part and a blade for removing the burrs is formed on the lower portion in either of the first protrusion or the second protrusion . It is preferable if offset is formed between the first protrusion and the second protrusion with respect to the direction extended along the connecting part from the body part .

It is preferable if the blade is formed in the offset of the protrusion closer to the connecting part among the first and the second protrusions.

It is preferable if the first and the second protrusions have a sphere shape on their outsides, respectively.

It is preferable if the connecting part is combined with the body part to perform a hinge movement on the body part and an elastic member for applying elastic-reaction force to the hinge movement of the connecting part is joined with the body part .

It is preferable if the elastic member is a plate spring. It is preferable if a plate part on which a slot is formed along the longitudinal direction is joined on the side of the body part opposite to the side on which the elastic member is joined by means of a joining member which passes through the slot. It is preferable if the cutter part revolves in the opposite direction to the revolution direction of a drill for drilling the hole.

According to the preferred embodiment of the present invention, if the revolution direction of the drill for drilling the intersecting hole is counterclockwise viewed from the exit of the hole, the blade is formed on the protrusion positioned on the right among the first and the second protrusions viewed from the top of the first and the second protrusions to the base. According to the preferred embodiment of the present invention, if the revolution direction of the drill for drilling the intersecting hole is clockwise viewed from the exit of the hole, the blade is formed on the protrusion positioned on the left among the first and the second protrusions viewed from the top of the first and the second protrusions to the base.

ADVANTEGEOUS EFFECTS

The present invention provides a burr-removing device which can smoothly and efficiently remove burrs on an intersecting hole, which is difficult to access to, without an over-cutting problem.

BRIEF EXPLANATION OF DRAWINGS

Fig. 1 is a view showing burrs generated on an intersecting hole with an angle;

Figs .2 to 4 are views showing a burr-removing device according to the present invention;

Fig. 5 is a view showing the configuration of the cutter part of the burr-removing device according to the present invention; and

Figs. 6 and 7 are views showing the operation of the burr-removing device according to the present invention.

MODE FOR INVENTION

The preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Figs. 2 to 4 show a burr-removing device 100 according to the present invention. The burr-removing device 100 has a body part 10, a cutter part 20 and a connecting part 30 which connects the body part

10 and the cutter part 20. The burr-removing device 100 also has a plate spring 40 which applies elastic force to the connecting part 30.

According to this embodiment, a grove 11 is formed in one end of the body part 10 and through holes 18 and 18' are formed on both sides of the grove 11. Also, on two sides of the body part 10 which face each other where the grove 11 is formed, flat faces 14 and 16 are respectively formed and screw holes 13 are formed through the flat faces 14 and 16.

On the upper portion of the connecting part 30, the cutter part 20 is mounted and on the lower portion of the connecting part 30, a lump part 35 is formed and a through hole 38 through which a pin 8 is inserted is formed in the lump part 35.

In the grove 11 of the body part 10, the connecting part 30 is positioned to correspond the through hole 38 of the lump part 35 with the through holes 18 and 18' formed on the both sides of the groove 11 and the pin 18 is inserted through the corresponding holes 38, 18 and 18' so that the connecting part 30 is combined with the body part 10 and the connecting part 30 performs a hinge movement in the groove 11 of the body part 10. The plate spring 40 has a joining part 41 on its lower portion which joins with the flat face 16 of the body part 10. The joining part 41 has through holes 43 and an extension from the joining part 41 forms a spring part 45.

The joining part 31 of the plate spring 40 is placed on the flat face 16 and screws 9 are combined through the through holes 43 and screw holes 13 so that the plate spring 40 is combined with the body part 10 and the spring part 45 of the plate spring 40 elastically supports the connecting part 30.

On the flat face 14 of the body part 10, a plate part 50 is placed to face the upper surface of the cutter part 20. (That is, to face the upper side in the drawing)

On the plate part 50, a slot 58 is formedalong its longitudinal direction and screws 9' are combined through the slot 58 and the screw holes 13 so that the plate part 50 is fixedly combined in the flat face 14 of the body part 10.

Accordingly, the connecting part 30 is in contact with the upper end of the plate part 50 in its upper side and is supported by the plate spring 40 in its lower side. As a result, the cutter part 20 keeps elastic contact with a work piece.

In this case, it is possible to position the plate part 50 in the forward position or the rearward position along the longitudinal direction of the slot 58 where a user wants to place . That is, by moving the plate part 50 forward or rearward along the longitudinal direction of the slot 58, it is possible to control the position of the plate part 50 on the body part 10 in its longitudinal direction. This constitution makes it possible to adjust an inclination of the connecting part 30 and, as a result, it is possible to control locus of a circle drawn by the cutter part 20 according to the revolution of the body part 10.

The cutter part 20 is mounted on the upper portion of the connecting part 30 and the cutter part 20 is positioned to be distanced from the line L extended from the central axis of the body part 10 so that the cutter part 20 draws locus of a circle when the body part 10 revolves. The distance is denoted by D in the drawing. If the position of the slot 58 with which the screw 9' is combined is adjusted and the plate part 50 is moved to rearward, the inclination of the connecting part 30 toward the upper side increases and the distance D of the cutter part 20 from the central axis line L of the body part 10 also increases. As a result, the locus of the circle drawn by the cutter part 20 becomes larger when the body part 10 revolves.

Hence, according to the present invention, it is possible to control the locus of the circle drawn by the cutter part 20 by adjusting the position of the slot 58 with which the screw 9' is combined as to the plate part 50.

Fig. 5 shows the configuration of the cutter part 20 of the burr-removing device 100 according to the present invention.

The cutter part 20 has a base 25 and a first protrusion 23 and a second protrusion 28 which extend from the both side of the base 25, respectively. The upper portion of the first and second protrusions 23 and 28 has convex round shape Ru.

According to the present invention, the first protrusion 23 and the second protrusion 28 are formed to be parallel each other with an angle α inclined from the direction W extended along the connecting part 30 from the body part 10.

Also, according to the present invention, a blade C for removing the burrs is formed on the lower portion in either of the first protrusion 23 or the second protrusion 28. In this embodiment, the blade C is formed on the lower portion 288 of the second protrusion 28 positioned which is positioned on the right.

Accordingly, the blade C is formed along the inclination angle a. from the direction W extended along the connecting part 30 from the body part 10 so that the cutter part 20 moves along circumference surface and removes the burrs on the surface.

Preferably, according to the present invention, the first protrusion 23 and the second protrusion 28 are distanced from each other with respect to the direction extended along the connecting part 30 from the body part 10 to form offset. In this case, the blade C is formed in the offset t in the lower portion 288 of the second protrusion 28, which is closer to the connecting part 30. Preferably, according to the present invention, as shown, the first protrusion 23 and the second protrusion 28 have a sphere shape Rs on their outsides, respectively.

Now, with reference to Figs. 4 and 5, the operation of the burr-removing device 100 will be described. The body part 10 is mounted on the drilling machine and the burr-removing device 100 is inserted through the secondary hole

H2 so that the blade C of the cutter part 20 comes into contact with the intersecting edge I of the primary hole Hl and the secondary hole H2. Then, the body part 10 is revolved and the blade C of the cutter part 20 draws the locus of the circle by its movement and removes burrs on the intersecting edge.

In this case, the cutter part 20 should be revolved in the opposite direction to the revolution direction of the drill for drilling the hole H2 in the initial stage. That is, the body part 10 should be revolved to revolve the cutter part 20 in the opposite direction to the revolution direction of the drill for drilling the hole. Accordingly, the burrs densely generated on the position fromwhich the drill is drawn out after its drilling of the hole H2 are efficiently removed.

In this embodiment, viewed from the hole H2 side, the cutter part 20 revolves clockwise in connection with the counterclockwise revolution of the drill for drilling the hole H2. According to this revolution direction, the blade C is formed on the lower portion 288 of the second protrusion 28 positioned on the right in the drawing in order to remove the burrs by its clockwise revolution.

Especially, if the difference of the diameter between the primary hole Hl and the secondary hole H2 is not large or the intersecting angle between the axes of the primary hole Hl and the secondary hole H2 is more escaped from 90 degree, the intersecting edge of the two holes forms a severely bent

3-dimensional closed curve. In this case, the body part 10 is drawn out rearward with proper speed while revolving in the opposite direction to the revolution direction of the drill for drilling the hole. Then, the cutter part 20 revolves along the axis of the body part 10 and contacts all the sections on the intersecting edge on which the burrs are formed and, accordingly, removes the burrs on the intersecting edge.

In case of removing the burrs on the intersecting edge I of the secondary hole H2 which intersects the primary hole Hl with an angle as described above, with reference to Fig. 6, since the blade C of the second protrusion 28 has the offset t with respect to the first protrusion 23, only the blade C of the second protrusion 28 contacts the intersecting edge I and removes the burrs when the cutter part 20 rotates along the circumference direction of the second hole H2. Also, in this case, the outsides of the first and second protrusions 23 and 28 have the sphere shape Rs and it ensures soft and smooth contact with the intersecting edge I.

Especially, the present invention prevents the over-cutting problem that the blade C contacts the inside of the primary hole Hl or the secondary hole H2 as well as the burrs and cuts over the burrs. For example, as shown in Fig. 7, if the blade C of the second protrusion 28 severely digs into the inside of the intersecting hole H2 (the reacting force in this case is denoted by Fc) , either of the sphere shape Rs or the convex round shape

Ru of the first protrusion 23 next to the second protrusion 28 contacts the corresponding inside of the secondary hole H2 and generates the reacting force Fr which prevents the severe dig.

Accordingly, the dig of the blade C into the inside of the intersecting hole H2 is prevented.

Also, according to the present invention, since the connecting part 30 on which the cutter part 20 is mounted is applied the elastic force by the plate spring 40, the blade C elastically contacts a work piece and it ensures the soft and smooth removal of the burrs.

INDUSTRIAL APPLICABILITY

As described above, the present invention provide a burr-removing device which can smoothly and efficiently remove burrs on an intersecting hole, which is difficult to access to, without the over-cutting problem.

Therefore, it is understood that the purpose of the present invention is accomplished.

The present invention is described with reference to the specific embodiments, but the invention is not limited there to. Only the claims will determine the scope of the invention.

Claims

1. A burr-removing device for removing burrs on an intersecting edge of two holes which intersects each other, the burr-removing device comprising: (a) a body part;

(b) a cutter part;

(c) a connecting part which connects the body part and the cutter part; wherein

(bl) the cutter part is mounted on an end of the connecting part to be distanced from the line extended from the central axis of the body part; and the cutter part includes (b2) a base;

(b3) a first and a second protrusions which extend from the both side of the base, respectively and the upper portion of which has convex round shape; wherein

(b31) the first and the second protrusions are formed to be parallel each other with an angle inclined from the direction extended along the connecting part from the body part and a blade for removing the burrs is formed on the lower portion in either of the first protrusion or the second protrusion.

2. The burr-removing device as recited in claim 1 wherein offset is formed between the first protrusion and the second protrusion with respect to the direction extended along the connecting part from the body part.

3. The burr-removing device as recited in claim 1 or 2 wherein the blade is formed in the offset of either of the first and the second protrusion closer to the connecting part. 4. The burr-removing device as recited in claim 3 wherein the first and the second protrusions have a sphere shape on their outsides, respectively.

5. The burr-removing device as recited in claim 1 or 2 wherein the connecting part is combined with the body part in such a way to perform a hinge movement to the body part and an elastic member for applying elastic-reaction force to the hinge movement of the connecting part is provided in the body part, β. The burr-removing device as recited in claim 5 wherein the elastic member is a plate spring.

7. The burr-removing device as recited in claim 6 wherein a plate part on which a slot is formed along the longitudinal direction is joined on the opposite side of the body part to the side on which the elastic member is joined, the plate part being joined by means of a joining member which passes through the slot.

8. The burr-removing device as recited in claim 1 or 2 wherein the cutter part revolves in the opposite direction to the revolution direction of a drill for drilling the hole.

9. The burr-removing device as recited in claim 1 or 2 wherein, if the revolution direction of the drill for drilling the intersecting hole is counterclockwise viewed from the exit of the hole, the blade is formed on the protrusion positioned on the right among the first and the second protrusions viewed from the top of the first and the second protrusions to the base. 10. The burr-removing device as recited in claim 1 or 2 wherein, if the revolution direction of the drill for drilling the intersecting hole is clockwise viewed from the exit of the hole, the blade is formed on the protrusion positioned on the left among the first and the second protrusions viewed from the top

of the first and the second protrusions to the base.