KR100471466B1 - A clamping devide for two faces binding of insert - Google Patents

Abstract

A back restrained clamping mechanism is disclosed. The back clamping mechanism according to the invention comprises a toolholder and clamp means. The tool holder has a seating groove formed at an end of the tip portion, and a positioning hole formed at one side so as to communicate with the seating groove and formed at one side of the support hole and the support hole. At this time, the first fastening hole is formed inside the support hole. On the other hand, the clamp means is integrally formed with the mounting plate and the mounting plate of the rhombus protruding vertically protruding vertically so that the insert is inserted into the seating groove while being seated in the seating groove and provided with the support holder is placed in the support hole Insert inserts are provided. The clamp means also has a vertical rod shape and has a first fastener and a second fastener coupled to the first fastening hole on the lower and upper circumferential surfaces and between the first fastener and the second fastener. The fastening screw is formed eccentrically at the center of the fastener and the second fastener to provide a clamping force to the inside of the insert, and a second fastening hole is formed to be fastened to the second fastener to form another on the lower surface of the insert. A clamp is provided to provide clamp force.

Description

A clamping devide for two faces binding of insert}

The present invention relates to a cutting tool for cutting a certain portion of a workpiece by mounting it on a machine tool, and more particularly, a cutting insert that performs actual cutting, using a screw and a clamp, is simple, fast, precise and powerful. The present invention relates to a back clamping mechanism capable of improving processing accuracy, surface roughness, and high cutting capability.

In general, a cutting tool is mainly used for cutting ferrous, nonferrous metals, and nonmetallic materials, and is a tool that is usually mounted on a machine tool and performs cutting to process a workpiece into a desired shape. Typically, such cutting tools consist of a cutting insert with a cutting edge and a body to hold the cutting insert.

In addition, the cutting tool can be divided into brazing type and indexable type according to the method of fixing the cutting insert to the body. The brazing type is permanently fixed by brazing welding the cutting insert to a part of the body. The indexable type is to mount and detach the cutting insert to and from the body using a fixing device provided in the body.

Indexable cutting tools can be easily replaced with new picklings in a short time when the picklings run out of life, a new form that solves the problems of the conventional brazing type cutting tools, ie, the disadvantage of having to regrind the cutting edges for a long time. As a cutting tool of, it is currently used in all parts of cutting tools.

Indexing requires a clamping mechanism for attaching the insert to the holder and the boring bar. Until now, various types of clamping mechanisms have been developed depending on the type and application of the cutting tool. In brief, the developed clamping mechanism is described first in the field of milling tools: "wedge", "wedge + locator", "screw on" and "clamp-on". "Clamp on" "," Hikomipin ", etc. have been developed. In the field of turning tools," lever lock "," wedge clamp "," screw-on "," clamp-on " "," Lamp + eccentric "has been developed.

Among them, the lever lock method is a one-side restraint type that restrains only the side of the insert. There is no clamping force in the bottom direction, and in the case of an insert having weak side restraint, there is a problem such that the insert is separated or broken during cutting. In order to improve such a problem, cutting tools capable of constraining the back of the insert have been developed, but there is a problem that the strong constraining of the back that does not completely restrain the insert due to the cutting chip interference is difficult.

The present invention has been made to solve the conventional problems as described above, an object of the present invention by simply and quickly, precisely, and securely fixed to the tool holder using a screw and clamp to perform the actual cutting, To provide a cutting tool capable of constraining the back of the insert, which can improve the machining accuracy, surface roughness, and high cutting capability.

In order to achieve the object of the present invention as described above, the present invention,

A tool holder having a seating groove formed at an end of the distal end portion, a support hole formed at one side to communicate with the seating groove, and having a first fastening hole formed therein, and a positioning hole formed at one side of the support hole; And

An insert holder having a support plate which is formed integrally with a mounting plate and a mounting plate of a rhombus shape in which a support protrusion is vertically protruded so as to be inserted into the seating groove while being seated in the seating groove and settled in the support hole; It has a vertical rod shape and has a first fastener and a second fastener coupled to the first fastening hole on the lower and upper circumferential surfaces, and clamp force inwardly of the insert between the first fastener and the second fastener. Insert support having an annular contact formed to provide a fastening screw and a body formed with a second fastening hole is fastened to the second fastening and on the radial side and the other side of the body on the lower surface of the insert And a clamping tool capable of constraining the back of the insert, the clamping means having a clamp having a clamp supporting portion fitted to the positioning hole. The ball.

As described above, according to the present invention, the cutting insert for actual cutting is secured to the tool holder simply, quickly, precisely and powerfully by using a screw and a clamp, so that the machining accuracy, the surface roughness, and the high cutting speed are high. Machining ability can be improved.

Hereinafter, with reference to the accompanying drawings will be described a cutting tool capable of constraining the back of the insert according to a preferred embodiment of the present invention.

1 is an exploded perspective view of a cutting tool capable of constraining the back of an insert according to a first embodiment of the present invention, and FIG. 2 is a perspective view of the coupled state of FIG. 1.

1 and 2, the cutting tool 100 capable of constraining the back of the insert according to the first embodiment of the present invention includes an insert having a tool holder 110 and a coupling hole 132 having a tip portion 112. 130 is provided with a clamp means 140 for fixing the insert 130 to the tool holder 110 while being placed.

At this time, a seating groove 114 is formed at the end of the tip portion 112 of the tool holder 110, and a support hole 116 is formed at one side of the seating groove 114 to communicate with the seating groove 114. On one side of the ball 116 is a positioning hole 118 is formed. At this time, both side walls of the seating groove 114 has a staircase shape that radially opens from an upper side to a lower side, and a first fastening hole 120 having a first fastening female screw 122 formed therein in the support hole 116.

On the other hand, the clamping means 140 is provided with insert insert 142, fastening screw 150 and the clamp 160. First, the insert seat 142 is formed integrally with the rhombus-like seating plate 144 and seating plate 144 having a shape similar to that of the insert 130 seated in the seating groove 114, the support hole 116 And a support holder ring 146 enclosed therein. At this time, the support protrusion 148 is vertically formed on the upper surface of the seating plate 144 so as to be inserted into the coupling hole 132 formed in the insert 130.

The fastening screw 150 has a vertical rod shape and has a first fastening screw 154a and a second fastening screw 154b having a first fastening screw 152a and a second fastening screw 152b formed on the lower and upper circumferential surfaces thereof. ). At this time, the first fastening male screw 152a has a shape corresponding to the first fastening female screw 122. In addition, the fastening screw 150 has an annular contact portion 156 between the first fastening table 154a and the second fastening table 154b. Preferably, the first tightening screw 152a is a left hand screw and the second tightening screw 152b is a right hand screw. More preferably, the first tightening screw 152a may be a left hand screw and the second tightening screw 152b may be a left hand screw. More preferably, first wrench insertion holes 158a and second wrench insertion holes 154b are formed at ends of the first fastening table 154a and the second fastening table 154b, respectively.

On the other hand, the clamp 160 has a body 166 having a second fastening hole 162 having a second fastening female screw 164 corresponding to the second fastening male screw 152b on the inner circumferential surface while being drilled perpendicularly to the center portion. Equipped. The insert supporting portion 168 and the clamp supporting portion 170 are formed in the body 166 formed as described above. Insert support portion 168 has a predetermined curvature extending from the radial one side to the lower side of the body 166, the clamp support 170 is a horizontal projection 172 extending horizontally from the other radial side of the body 166 to the outside And a vertical protrusion 174 vertically bent downward from the end of the horizontal protrusion 172. At this time, the inner surface of the vertical protrusion 174 is formed with an inclined surface 176 extending radially narrowly upward from the end of the vertical protrusion 174. Preferably, the lower surface of the support holder ring 146 and the clamp 160 to maintain the mounting plate 144 and the support holder ring 146 in contact with the mounting groove 114 and the support hole 116 at all times Springs 149 are disposed between them.

Hereinafter, the coupling state of the cutting tool 100 capable of constraining the back of the insert formed as described above will be briefly described.

First, the fastening screw 150 is coupled to the second fastening hole 162 of the clamp 160. That is, in the state where a conventional wrench (not shown) is inserted into the second wrench insertion hole 158b, the second fastening screw 154b having the second fastening screw 152b is formed and the second fastening female screw 164 is formed. Couple to the second fastening hole (162). As such, the spring 149 is coupled to the fastening screw 150 under the fastening screw 150 being fastened to the clamp 160. At this time, the seating groove 114 and the support hole 116 is placed on the seating plate 144 and the support holder ring 146 on which the insert 130 is placed in the seating groove 114 and the support hole 116.

When prepared as described above, the first fastening table 154a having the first fastening male thread 152a is coupled to the first fastening hole 120 having the second fastening female thread 122. That is, the wrench is inserted into the first wrench insertion hole 158a while the normal wrench is inserted into the first fastening hole 120 from the lower end of the tip portion 112 so that the first fastening table 154a is the first fastening hole. To 120. At this time, the contact portion 156 pushes the support holder ring 146 to the inside of the support hole 116 to apply the clamp force (F1), the vertical projection 174 of the clamp 160 to the positioning hole 118 Is inserted. At this time, the inclined surface 176 formed in the vertical protrusion 174 allows the bottom of the insert support 168 to be strongly adhered to the top surface of the insert 130 while smoothly inserting into the positioning hole 118. The insert support portion 168 that is tightly contacted in this way generates the clamp force F2 while strongly inserting the insert 130 and the seating plate 144 into the seating groove 114 (see FIG. 3). On the other hand, the spring 149 maintains the seating plate 144 and the support holder ring 146 in contact with the seating groove 114 and the support hole 116 at all times.

4 is an exploded perspective view of a cutting tool capable of constraining the back of the insert according to the second embodiment of the present invention, and FIG. 5 is an enlarged view of the insert rest illustrated in FIG. 4.

4 and 5, the cutting tool 200 capable of constraining the back of the insert according to the second embodiment of the present invention is provided with the same mounting groove 114 and the first fastening hole 120 as in the first embodiment. Tool holder 110 having a support hole 116 and a positioning hole 118, the insert 130 and the insert seat 142, the spring 149, the fastening screw 150, the coupling hole 132 is formed And clamp means 140 having a clamp 160.

At this time, in the insert seat 142, when the space of the seating groove 114 is small, the seating plate 244 and the seating plate 144 having a horizontal bar shape so as to strongly back the insert 130, And a support holder ring 146 formed integrally with the support hole 116. In this case, a vertical support protrusion 148 is formed at an extension of the seating plate 244 to be inserted into the coupling hole 132 formed in the insert 130. In addition, a mounting plate insertion groove 246 is formed in the mounting groove 114 of the tool holder 110. At this time, the seating plate insertion groove 246 is formed to have a shape corresponding to the seating plate 244 from the central portion of the seating groove 114 to the support hole 116.

As described above, the cutting tool (100, 200) capable of constraining the back of the insert according to the present invention includes a clamp (160) covering the tip portion (112) of the tool holder (110) and the top of the insert (130), By inserting the fastening screw 150 which pushes the insert 130 into and below the seating groove 114 to generate the clamping forces F1 and F2, the insert 130 restrains the back surface within the tool holder 110. Because of this, it is strongly clamped, and there is an advantage that the insert 130 is easily replaced before and after the operability of the seating plates 144 and 244 on which the insert 130 is placed.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art can be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims You will understand.

1 is an exploded perspective view of a back clamping mechanism according to a first embodiment of the present invention,

Figure 2 is a perspective view of the coupled state of Figure 1,

3 is a view showing a clamp force acting on the insert,

4 is an exploded perspective view of the back clamping mechanism according to the second embodiment of the present invention;

FIG. 5 is an enlarged view of the insert seat belt shown in FIG. 4. FIG.

Explanation of symbols on the main parts of the drawing

100, 200: back clamping mechanism

110: tool holder 112: distal end

114: seating groove 116: support hole

118: positioning hole 130: insert

132: coupling hole 140: clamp means

142: insert seat 144, 244: seating plate

146: support holder 150: fastening screw

154a: 1st fastening board 154b: 2nd fastening board

160: clamp 168: insert support

170: clamp support

Claims (6)

A tool holder having a seating groove formed at an end of the tip portion, a support hole formed at one side to communicate with the seating groove, and having a first fastening hole formed therein, and a positioning hole formed at one side of the support hole; And An insert seat having a mounting plate having a rhombus shape in which a support protrusion is vertically protruded so as to be inserted into the seating groove while being inserted into the seating groove, and a support holder ring formed integrally with the seating plate and seated in the support hole. And a first fastening rod and a second fastening rod having a vertical rod shape and coupled to the first fastening hole on the lower and upper circumferential surfaces, and between the first fastening rod and the second fastening rod. A fastening screw having an annular contact portion for providing a clamping force to the inside of the insert, and a body having a second fastening hole fastened to the second fastening member, and radially one side and the other side of the body onto the lower surface of the insert; Clamp means having an insert supporting portion for providing another clamping force and a clamp supporting portion fitted to the positioning hole; Cutting tool capable of confining the back of the insert, characterized in that made. The spring of claim 1, wherein the clamp means is disposed between the support holder and the lower surface of the clamp to maintain the seating plate and the support holder in contact with the seating groove and the support hole at all times. Cutting tool capable of constraining the back of the insert, characterized in that it further comprises. The method of claim 1, wherein the first fastening female screw and the second fastening female screw are formed on the inner circumferential surfaces of the first fastening hole and the second fastening hole, respectively. The first and second fastening screws corresponding to the female screw and the second fastening female screw are respectively formed, and the first wrench insertion hole and the second wrench insertion hole are formed at the end portions of the first fastening member and the second fastening member, respectively. Cutting tool capable of confining the back of the insert, characterized in that. delete The horizontal protrusion and the horizontal protrusion of claim 1, wherein the insert support portion has a predetermined curvature that is curved downward from one radial side of the body, and the clamp support portion extends horizontally from the other radial side of the body to the outside. A vertical projection bent vertically downward from the end of the vertical projection, the inner surface of the vertical projection is a cutting tool capable of restraining the back of the insert, characterized in that the inclined surface extending radially inwardly upward from the end of the vertical projection is formed . The seating plate of claim 1, wherein the seating plate may be formed to have a horizontal bar shape in order to strongly back the insert when the space of the seating groove is small. Cutting tool capable of restraining the back of the insert, characterized in that extending to the support hole to form a seating plate insertion groove having a shape corresponding to the seating plate.