WO2011126231A2

WO2011126231A2 - Cutter device

Info

Publication number: WO2011126231A2
Application number: PCT/KR2011/002119
Authority: WO
Inventors: Hyun Hwa Jeong
Original assignee: Taegutec Ltd.
Priority date: 2010-04-08
Filing date: 2011-03-28
Publication date: 2011-10-13
Also published as: JP2013523468A; WO2011126231A3; KR20110112996A; EP2555892A2; KR101161771B1

Abstract

The present invention discloses a cutter device having a pocket formed on a body to receive an insert and a screw hole formed in proximity of the pocket to receive a screw, clamping the insert by a deformable gripping part which is displaced by the screw wherein: the insert has a hexahedral shape, and has parallel upper and lower surfaces and parallel opposing side surfaces, one opposing pair of the side surfaces being provided with grooves extending lengthwise, the other opposing pair of the side surfaces having cutting blades on the upper and lower edges, the pocket is formed by two side walls, a backside wall, and a bottom wall, and is open forwardly and upwardly, one side wall being provided with a guide protrusion extending lengthwise and fit complementarily to one of the grooves of the insert, the other side wall being a portion of the deformable gripping part and being provided with a guide protrusion extending lengthwise to fit complementarily with the other one of the grooves of the insert, the screw has a taper portion which has a diameter increasing toward the head end, and the deformable gripping part has a neck portion which is formed by a slot traversing the screw hole inclinedly and a lower edge of the other side wall of the pocket, and is elastically displaceable so that the distance between the guide protrusions is narrowed by pressing of the taper portion when the screw is tightened.

Description

CUTTER DEVICE

This disclosure is related to a cutter device for which inserts can be changed quickly.

In general, edge mill cutters are used to machine a large amount of material on work-pieces. These edge mill cutters are mounted with many screw-on-type inserts as shown in Fig. 1 for example. Although the screw-on-type inserts have various advantages, many users complain about insert changing time. To change one screw-on-type insert, a screw need be pulled out from each insert tap completely. It is time-consuming and laborious to change inserts especially when the edge mill has many inserts. In a heavy edge mill, changing conventional inserts leads to a serious reduction in productivity. If tangential screw-on-type inserts as shown in Fig. 1 are used, since the inserts have to have screw holes and the length of the inserts becomes large, there is a limitation in the number of effective edges mountable on the given edge mill cutter head.

The present disclosure aims to provide a cutter device for which inserts can be changed quickly with a simple clamping mechanism.

A cutter device according to the present disclosure has a pocket formed on a body to receive an insert and a screw hole formed in proximity of the pocket to receive a screw, clamping the insert by a deformable gripping part which is displaced by the screw wherein: the insert has a hexahedral shape, and has parallel upper and lower surfaces and parallel opposing side surfaces, one opposing pair of the side surfaces being provided with grooves extending lengthwise, the other opposing pair of the side surfaces having cutting blades on the upper and lower edges, the pocket is formed by two side walls, a backside wall, and a bottom wall, and is open forwardly and upwardly, one side wall being provided with a guide protrusion extending lengthwise and fit complementarily to one of the grooves of the insert, the other side wall being a portion of the deformable gripping part and being provided with a guide protrusion extending lengthwise to fit complementarily with the other one of the grooves of the insert, the screw has a taper portion which has a diameter increasing toward the head end, and the deformable gripping part has a neck portion which is formed by a slot traversing the screw hole inclinedly and a lower edge of the other side wall of the pocket, and is elastically displaceable so that the distance between the guide protrusions is narrowed by pressing of the taper portion when the screw is tightened.

In the cutter device according to the present disclosure, the slot may be oriented so that the cross section of the neck portion has opposing sides parallel to each other.

In the cutter device according to the present disclosure, the deformable gripping part may be divided by a supplemental slot from the body.

In the cutter device according to the present disclosure, the grooves of the insert may be shaped as a symmetrical concave arc in cross section.

In the cutter device according to the present disclosure, the undisplaced distance between the guide protrusions may be smaller than the width of the upper and lower surfaces of the insert, and is larger than the minimum width made by the two grooves of the insert.

Fig.1 is a perspective view depicting a conventional cutter device.

Fig.2 is an exploded perspective view of a portion of a cutter device in accordance with the present disclosure.

Fig.3 is a sectional view of a portion of a cutter device in accordance with the present disclosure.

Fig.4 is a perspective view of an insert-mounted portion of a cutter device in accordance with the present disclosure.

Fig. 5 is a perspective view of a cutter device in accordance with the present disclosure.

Hereinafter, a cutter device according to the embodiments of the present disclosure is described. The figures attached to the present disclosure are merely for convenience of explanation, and the shapes and the relative scales may be exaggerated or abridged.

A cutter device according to this disclosure has a pocket 200 formed on a body to receive an insert 100 and a screw hole 420 formed in proximity of the pocket 200 to receive a screw 400, and clamps the insert 100 by a deformable gripping part 300 which is displaced by the screw 400.

The insert 100 has a hexahedral shape, and has parallel upper and lower surfaces 111,112 and parallel opposing side surfaces 121,122,123,124. One opposing pair of the side surfaces 121,122 are provided with grooves 131,132 extending lengthwise and the other opposing pair of the side surfaces 123,124 have cutting blades on the upper and lower edges. The insert may be shaped as a square, a rectangle, a parallelogram, or a rhombus.

The pocket 200 is formed by two side walls 210,220, a backside wall 240, and a bottom wall 230, and is open forwardly and upwardly. One side wall 210 is provided with a guide protrusion 211 extending lengthwise so as to fit complementarily to one groove 131 formed on one side surface 121 of the insert 100, and the other side wall 220 is formed by the deformable gripping part 300 and is provided with a guide protrusion 311 extending lengthwise so as to fit complementarily to the other groove 132 formed on the other side 122 of the insert 100. The forward opening of the pocket 200 is formed in the chip gullet of the cutter device body. The cutter device is provided with a screw hole 420 formed in proximity of the pocket 200 for a screw 400 to be coupled into. The screw 400 has a head on which a wrench hole is formed, and has a taper portion 410 which has a diameter increasing toward the head end.

The deformable gripping part 300 is divided from the body by the other side wall 220 of the pocket 200 and a slot 510 traversing the screw hole 420 inclinedly and has a neck portion 520 which is formed by the slot 510 and a lower edge of the other side wall 220 of the pocket 200. The deformable gripping part 300 is elastically displaced so that the distance between the guide protrusions 211,311 is narrowed by pressing of the taper portion 410 when the screw 400 is tightened, and the insert 100 inserted between the guide protrusions is tightly clamped. The slot 510 is preferably oriented so that the cross section of the neck portion 520 has opposing sides parallel to each other. This orientation of the slot 510 allows the deformable gripping part 300 to elastically displace easily along the direction perpendicular to the opposing sides. The deformable gripping part 300 may be divided from the body by a supplemental slot 530 which is formed toward the inside of the body. The supplemental slot 530 allows the deformable gripping part 300 to elastically displace more easily.

The grooves 131,132 of the insert 100 are preferably shaped as a symmetrical concave arc in cross section so that the insert 100 has the same clamping structure when the orientation of the insert changes up-and-down and right-and-left. Accordingly, the guide protrusions 211,311 of the pocket 200 have a convex arc in cross section so as to be resistant to wearing out. In addition, the grooves 131,132 of the insert 100 may be formed as a concave V-type or notch type.

In this disclosure,“length” means the dimension in the direction which the insert 100 can slide in and out with the grooves 131,132 of the insert 100 coupled with the guide protrusions 211,311 of the pocket 200.

The mounting operation of the insert in the cutter device according to the present disclosure is explained as follows.

A screw 400 is coupled into a screw hole 420 formed in proximity of the pocket 200. At this moment, the screw 400 is not thoroughly tightened into the screw hole 420 of the cutter device body, and the deformable gripping part 300 is in an undisplaced state.

Next, an insert 100 is positioned in front of the forward opening of the pocket 200 in the chip gullet such that two grooves 131,132 of the insert 100 conform to the guide protrusions 211,311 of the pocket 200. Then the insert 100 is pushed in lengthwise until the rear side surface 124 contacts the backside wall 240 of the pocket 200. Here, the undisplaced distance between the guide protrusions 211,311 is preferably smaller than the width of the upper surface 111 and lower surface 112 of the insert 100, but is larger than the minimum width made by the two grooves 131,132 of the insert 100. In this way, the pushed-in insert 100 can move back and forth but does not move away from the pocket 200 upwardly.

Next, a screw 400 having a taper portion 410 which has a diameter increasing toward the head end is fully tightened, and then, as the taper portion 410 of the screw 400 presses the deformable gripping part 300 to elastically displaced, widening the gap size of the slot 510. As a result, the width made by the guide protrusions 211,311 becomes even smaller and the lower inclined surfaces of the guide protrusions 211,311 compress the lower inclined surfaces of the two grooves 131,132 of the insert 100. Then, the lower surface 112 of the inset 100 is strongly pushed onto the bottom wall 230 of the pocket 200, and the insert mounting is completed.

Since the cutting resistance load experienced during the cutting operation is mainly counterbalanced by the bottom wall 230 and the backside wall 240 of the pocket 200, the load born by the deformable gripping part 300 and the screw 400 is minimal.

When the insert 100 is dismounted, the screw 400 is partially untightened. The elastically displaced deformable gripping part 300 is now restored into an undisplaced state and the width made by the guide protrusions 211,311is widened. Since the insert becomes loose, the insert 100 can be taken out of the pocket200 through the forward opening into the chip gullet.

As explained above, since inserts can be exchanged by partial untightening of a screw, time for insert changing can be reduced for the cutter device according to this disclosure. Since the insert according to this disclosure has no screw hole, die-set can be easily produced compared to the conventional tangential inserts and the rigidity of the insert is much increased. Also, since the insert has no screw hole, the length of the insert is small compared to the conventional tangential inserts and many more cutting edges can be mounted on the given cutter device head. The cutter device according to the present disclosure is especially useful for cutter devices which have many inserts mounted thereon as shown in Fig. 5.

The cutting device disclosed above may have various other embodiments without departing from the basic concept of the present disclosure. Accordingly, all the disclosed embodiments must be understood as being exemplary only and must not be construed to be the limit of the present disclosure. Accordingly, the range of protection for the present disclosure must be determined not by an embodiment described hereinabove, but by the attached claims. An alternative that is equivalent to the attached claims is included in the range of protection of the attached claims.

The cutter device according to this disclosure can reduce the time for insert changing. The insert according to this disclosure is more easily produced compared to the conventional tangential inserts and the rigidity of the insert is much increased. Also, by making the length of the insert small, more cutting edges can be mounted on the cutter device head.

Claims

A cutter device having a pocket formed on a body to receive an insert and a screw hole formed in proximity of the pocket to receive a screw, clamping the insert by a deformable gripping part which is displaced by the screw wherein:

the insert has a hexahedral shape, and has parallel upper and lower surfaces and parallel opposing side surfaces, one opposing pair of the side surfaces being provided with grooves extending lengthwise, the other opposing pair of the side surfaces having cutting blades on the upper and lower edges,

the pocket is formed by two side walls, a backside wall, and a bottom wall, and is open forwardly and upwardly, one side wall being provided with a guide protrusion extending lengthwise and fit complementarily to one of the grooves of the insert, the other side wall being a portion of the deformable gripping part and being provided with a guide protrusion extending lengthwise to fit complementarily with the other one of the grooves of the insert,

the screw has a taper portion which has a diameter increasing toward the head end, and

the deformable gripping part has a neck portion which is formed by a slot traversing the screw hole inclinedly and a lower edge of the other side wall of the pocket, and is elastically displaceable so that the distance between the guide protrusions is narrowed by pressing of the taper portion when the screw is tightened.
The insert according to claim 1, wherein

the slot is oriented so that the cross section of the neck portion has opposing sides parallel to each other.
The insert according to claim 1, wherein

the deformable gripping part is divided by a supplemental slot from the body.
The insert according to claim 1, wherein

the grooves of the insert are shaped as a symmetrical concave arc in cross section.
The insert according to claim 1, wherein

the undisplaced distance between the guide protrusions is smaller than the width of the upper and lower surfaces of the insert, and is larger than the minimum width made by the two grooves of the insert.