KR20190135292A - Tool Holder For Machine Tools - Google Patents

Abstract

The present invention relates to a tool holder for a machine tool, and comprises: a main body having a through hole penetrating both ends in the longitudinal direction, and having a large diameter unit having an inner diameter larger than the inner diameter of the through hole at one end of the through hole; a sleeve having one end fitted into one end of the through hole and protruding from the other end of the through hole, and a protrusion unit formed on the outer circumference of the other end such that the other end is caught by the large diameter unit; an elastic body provided at both sides of the protrusion unit to be fitted and coupled to the sleeve; and an elastic support member inserted into one end of the through hole to support the elastic body to prevent the elastic body from being separated. Therefore, the present invention supports the elastic body inserted into the inner circumference of the through hole so that the sleeve can be stably moved due to external force, thereby preventing a thread from being broken when the thread is formed.

Description

Tool holders for machine tools {Tool Holder For Machine Tools}

The present invention relates to a tool holder for a machine tool, and more particularly, to a tool holder for a machine tool that can be mounted to a machine tool for automatically machining an object by combining a tool.

In general, a machine tool refers to a machine that mounts a tool and processes materials such as metal while cutting chips such as cutting and grinding, which are the basis of a machine tool, to produce a required shape.

The tool used in the machine tool is mounted by the chuck to be mounted on the spindle. In order to mount the tool on the chuck, a tool holder for mounting various tools is provided.

Tool holders have various shapes / forms depending on the shape and mounting method of the chuck, and various structures for firmly and conveniently mounting tools have been developed.

On the other hand, in order to form a thread in the hole formed in the workpiece, a tab (tool) is coupled to the tool holder, and the tool holder is coupled to the spindle of the machine tool, and then the tab is rotated to form a thread in the hole of the workpiece. .

Here, in the process of separating the tool from the object after the formation of the thread is completed, the screw thread is not damaged if the rotational speed of the spindle and the backward value of the Z-axis interlock with each other.

However, due to the synchronization error of the machine tool, the spindle may not be rotated for more than a certain time. At this time, a stress is generated between the tab and the thread and a problem occurs that the thread is broken while a load is applied to the tab and the thread. In addition, if this occurs continuously, the tab is also damaged, which causes a problem in that the precision of the thread is reduced.

In order to solve this problem, a function for compensating synchronizing error has been added to the chuck for mounting a tool holder to which a tool (tab) is coupled. This is called a synchro chuck.

However, the general chuck without the function of compensating for the synchronization error as described above is still in use in the industrial field. As such, a tool holder for mounting on a general chuck which does not have a function for compensating for the synchronization error is also required.

Republic of Korea Patent Application Publication No. 10-2013-0110449 (2013.10.10.) Republic of Korea Patent Publication 10-2005-0034697 (2005.04.14.)

The present invention is a tool for a machine tool which adds a function for compensating a synchronous error to a general chuck to prevent the thread from being broken during thread machining in the hole of the object, and to prolong the life by preventing the damage of the tool. The purpose is to provide a holder.

It is also an object of the present invention to provide a tool holder for a machine tool that supports an elastic body so that a sleeve can be stably flowed when excessive external force occurs.

In order to achieve the above object, the present invention provides a through hole penetrating both ends in a longitudinal direction, and a main body having a large diameter portion having an inner diameter larger than the inner diameter of the through hole at one end of the through hole, and one end of the through hole. One end is protruded into the other end of the through-hole, and the other end is caught in the large diameter portion, the sleeve is formed on the outer periphery of the other end, and is fitted to fit the sleeve but is formed to surround the protrusion is generated between the tool and the object At least one elastic body that absorbs and reduces the load, and is coupled to one end of the through-hole is characterized in that it comprises an elastic support member for adjusting the elasticity of the elastic body by pressing the elastic body.

In addition, the elastic support member includes a ring-shaped coupling portion that is screwed to the inner circumference of one end of the through hole formed with the enlarged diameter portion, and a support protrusion protruding from the coupling portion into the through hole to support the elastic body. Can be configured.

In addition, at least two fitting grooves may be formed on a surface facing outward from the coupling part to which a tool for rotating the elastic support member is inserted to screw the elastic support member.

In addition, the inner circumferential surface of the through-hole of the main body and the outer circumferential surface of the sleeve are formed so that at least one locking groove faces each other to form a locking space, and at least one locking member is accommodated in the locking space to accommodate the sleeve in the through-hole of the main body. Can be configured to be prevented from rotating.

In addition, one end of the sleeve protruding to the other end of the main body is detachably coupled to the adapter coupling means and may further comprise an adapter for coupling the tool,

In addition, the adapter coupling means, the adapter coupling portion is formed with a step with a diameter smaller than the outer diameter of the sleeve so that the adapter is fitted into the protruding end of the sleeve, and the adapter coupling portion of the sleeve is formed at one end of the adapter to fit A coupling groove for the sleeve, a coupling groove formed on the outer circumference of the adapter coupling portion, a coupling hole communicating with the coupling coupling hole for the sleeve at the outer circumference of one end of the adapter, and a coupling hole communicating with the coupling groove, and fastening fixed to the coupling hole and the coupling groove. It can be configured to include a member.

In addition, the sleeve is configured to be separated into two on the basis of the protruding portion, it is formed in the shape of a pipe, one end of the through body penetrates through the through hole to one end of the main body and the other end is accommodated in the through hole, A coupling protrusion which is screwed to the inside of the other end of the sleeve first body is formed extending in the longitudinal direction from one end, it may be configured to include a sleeve second body formed in the outer periphery of one end.

In addition, the sleeve is configured to be separated into two on the basis of the protruding portion, one end of the pipe through the through hole protrudes into one end of the main body, the other end is accommodated in the through hole, the outer diameter is smaller than the outer diameter of the sleeve on the outer peripheral surface The first body of the sleeve is formed in the coupling groove is coupled to the outer periphery of the coupling groove portion of the sleeve first body, it may be configured to include a second body of the sleeve formed on the outer periphery of one end.

According to the present invention, by providing an elastic support member at the end of the through-hole on the side in which the elastic body is fitted, it supports the elastic body deformed due to impact so that the flow of the sleeve can be made stable and prevents the thread from being broken during machining of the thread. can do.

In addition, by constituting a sleeve composed of one component with two components, it is possible to reduce defects during manufacturing, thereby reducing the cost and facilitating the assembly of the elastic body.

1 is an exploded perspective view showing a tool holder for a machine tool according to a first embodiment of the present invention.
2 is a cross-sectional view of the tool holder for the machine tool of FIG.
Figure 3 is a cross-sectional view showing a state before the deformation of the elastic body, a gap is generated between the ball stopper and the adapter before use of the tool in the tool holder of FIG.
4 is a cross-sectional view showing a state in which the elastic body is deformed without a gap between the ball stopper and the adapter during use of the tool in the tool holder of FIG.
FIG. 5 is a sectional view showing the main parts of a state before and after deformation of the elastic body in FIGS. 3 and 4; FIG.
Figure 6 is a perspective view showing another form of the sleeve in the tool holder for a machine tool according to an embodiment of the present invention.
Figure 7 is a perspective view showing another form of the sleeve in the tool holder for a machine tool according to an embodiment of the present invention.

The terms or words used in this specification and claims are not to be construed as being limited to the common or dictionary meanings, but the inventors will appropriately define the concept of terms in order to best describe their invention. Can be interpreted as meanings and concepts corresponding to the technical spirit of the present invention.

In addition, the configuration shown in the embodiments and drawings described herein is only a preferred embodiment of the present invention, and does not represent all of the technical ideas of the present invention, which can be replaced at the time of the present application It should be understood that there may be various equivalents and variations.

1 is an exploded perspective view showing a tool holder for a machine tool according to a first embodiment of the present invention, Figure 2 is a cross-sectional view showing the tool holder for the machine tool of Figure 1, Figure 3 is a tool holder of Figure 1 It is sectional drawing which shows the gap between the ball stopper and an adapter before using a tool, and the state before an deformation | transformation of an elastic body. 4 is a cross-sectional view showing a state where there is no gap between the ball stopper and the adapter during use of the tool in the tool holder of FIG. 1 and the elastic body is deformed, and FIG. 5 is a state before and after the deformation of the elastic body in FIGS. 3 and 4. It is a sectional view of the main portion in detail.

1 to 5, the tool holder for a machine tool according to an embodiment of the present invention, the through-hole 111 is formed in the longitudinal direction, and is inserted into the through-hole 111 It includes a sleeve 120 protruding to one end, an elastic body 130 fitted to the sleeve 120, and an elastic support member 140 inserted into the through hole 111 to support the elastic body 130.

The main body 110 is formed in a pipe shape, and the through hole penetrating both ends in the longitudinal direction is formed. One end of the through hole 111 is provided with a large diameter portion 112 formed of an inner diameter larger than the inner diameter of the through hole 111. Therefore, the locking jaw is provided by the large diameter part 112 at one end of the through hole 111 of the main body 110. As shown in the figure, the main body 110 is configured to reduce the outer diameter from one end to the other end. Hereinafter, one end of each component in the drawings, one side is referred to as the right side in the drawing, the other end, the other side will be referred to as the left side in the drawing.

The sleeve 120 may be formed in a pipe shape to directly couple a tool (not shown) or to couple a tool through a separate adapter 170 to be described later. The sleeve 120 is fitted into the through hole 111 of the main body 110 to be coupled. Specifically, one end of the sleeve 120 is inserted into the other end of the through hole 111 to protrude through one end of the through hole 111.

On the outer circumference of the other end of the sleeve 120 is inserted into the large diameter portion 112 of the through hole 111, the protrusion 121 is caught on the locking jaw so as not to be fitted into the through hole 111 is formed. Thus, the other end of the sleeve 120 is located in the large diameter portion 112 of the through hole 111. The protrusion 121 may have a cross section formed in any one of a semicircular, triangular, and trapezoidal shape.

At the other end of the sleeve 120, a support portion protrudes from a portion spaced apart from the protrusion 121. The support part prevents the elastic body 130, which will be described later, surrounding one side (right side) of the protrusion 121 from being moved toward one end of the sleeve 120.

One end of the sleeve 120 is formed with a coupling portion 125 to which the adapter 170 for fixing the tool separately. Coupling portion 125 of the sleeve 120 may be formed to a diameter smaller than the outer diameter of the sleeve 120.

The elastic body 130 is to absorb and reduce the load generated between the tool and the object (processing object), provided with at least one, but in one embodiment of the present invention is configured in two to surround both sides of the protrusion.

The elastic body 130 is fitted to the sleeve 120 is coupled, it is provided on both sides of the protrusion 121. Thus, the elastic body 130 has an external impact between the engaging jaw of the through hole 111 and the protrusion 121 of the sleeve 120, and the protrusion 121 of the sleeve 120 and the elastic support member 140 to be described later. When applied, it can be absorbed and buffered. That is, the elastic body 130 is deformed as shown in the lower side of FIG. 5 when an external force is applied to the sleeve 120 and is restored to its original state when the external force is removed.

That is, the elastic body 130 is configured such that the sleeve 120 moves in the axial direction by an external force in the through hole 111 of the main body 110 while the object is being processed by the tool. It absorbs and reduces the load generated between the threads.

Looking at this in more detail, when a load is generated between the tool and the thread (object), the elastic body 130 absorbs the load when the sleeve 120 is moved finely along the axial direction of the main body 110, The load generated between and the thread can be reduced. This can prevent damage to the threads formed in the hole of the object, as well as to reduce the life of the tool.

The elastic body 130 is formed of an O ring so as to fit on the outer circumference of the sleeve 120 of the cylindrical shape. Here, it is shown as an example that the elastic body has a circular shape as shown in the drawings, and may be formed in various shapes such as square, pentagon, triangular, 'c' shape, and the like.

The elastic support member 140 is screwed to one end of the through hole 111. The elastic support member 140 supports the elastic body 130 inserted into the sleeve 120 to adjust the elastic force of the elastic body 130.

The elastic support member 140 has a ring-shaped coupling portion 141 which is screwed to the inner circumference of the other end of the through hole 111 in which the large-diameter portion 112 is formed, and from the coupling portion 141 into the through hole 111. It is formed to include a support protrusion 142 protruding to support the elastic body 130.

That is, a screw thread is formed at the other end of the through hole 111, and a screw thread is formed at the outer circumference of the coupling part 141 so that the coupling part 141 is fixed to the other end of the through hole 111 by screwing.

Therefore, when the coupling part 141 is screwed to the inner circumferential surface of the through hole 111, the elastic force of the elastic body 130 supported by the support protrusion 142 may be adjusted by adjusting the amount of rotating the coupling part 141. It is.

That is, the coupling part 141 is screwed into the through-hole 111 of the main body 110, the elastic body (size) in which the coupling part 141 protrudes from the end of the main body 110 to the outside. 130) you can see the elastic force.

Here, when screwing the elastic support member 140 to the through-hole 111, the length of the coupling portion 141 protrudes to the end of the main body 110 may be applied differently depending on the tool mounted on the tool holder. Can be. That is, when the elastic support member 140 is coupled to the through hole 111 according to the tool mounted on the tool holder, the optimal length of the coupling part 141 protruding to the end of the main body 110 is determined by many experiments. It is desirable to decide.

The elastic support member 140 must use a separate tool to couple the coupling portion 141 so that the coupling portion 141 does not protrude outward and is completely fitted into the through hole 111. That is, a plurality of fitting grooves 141a may be formed on the outer surface of the coupling part 141, and a separate tool may be temporarily inserted into the fitting grooves 141a to rotate the elastic support member 140.

The support protrusion 142 is inserted between the inner circumferential surface of the large diameter portion 112 of the main body 110 and the outer circumferential surface of the sleeve 120 to fit the outer circumferential surface of the sleeve 120 to support the elastic body 130 surrounding the protrusion 121. .

Meanwhile, rotation preventing means is provided between the main body 110 and the sleeve 120 to prevent the sleeve 120 fitted into the through hole 111 from rotating.

The anti-rotation means includes at least one locking groove 122 formed on an outer circumference of the sleeve 120, another locking groove 122 formed on an inner circumferential surface of the through hole 111 and facing the locking groove 122. , At least one locking member 150 fitted into the locking groove 122 of the sleeve 120 and the locking groove 122 of the through hole 111.

The locking grooves 122 are formed on the outer circumferential surface of the sleeve 120 and the inner circumferential surface of the through hole 111, respectively, and are formed to face each other to form a locking space for receiving the locking member 150. The locking groove 122 may be formed in one or more along the outer circumference of the sleeve 120. One or more locking grooves 122 formed on the inner circumferential surface of the through hole 111 may be formed along the inner circumference of the through hole 111, and may be formed in the same number as the locking grooves 122 of the sleeve 120. have. Therefore, the locking space in which the locking member 150 is accommodated may be configured in one or more, and may be formed in the same number as the locking groove 122.

At least one locking member 150 is configured to be accommodated in the locking space. Therefore, when a plurality of locking spaces are formed, the locking member 150 may be configured in plurality. The locking member 150 is formed of a ball member (steel ball) so that it can be easily moved in the locking space.

The locking groove 122 is formed as a long groove in the longitudinal direction of the main body 110. This is because the external force is applied to the tool holder, as shown in Figure 4 and 5, when the sleeve 120 is moved from the through hole 111 to the opposite side of the adapter 170, the locking member 150 also moves in the locking groove 122 To make it possible. That is, the length of the locking groove 122 may be larger than the diameter of the locking member 150 so that the locking member 150 can be moved in the locking groove 122. In addition, when the plurality of locking members 150 are accommodated in one locking groove 122, the length of the locking grooves 122 may be larger than the sum of the lengths of the plurality of locking members 150.

The rotation preventing means further includes a ball stopper 160 which is inserted into and coupled to the through hole 111 to prevent the locking member 150 fitted into the locking space from being pulled out.

On the other hand, the tool holder according to an embodiment of the present invention further comprises an adapter 170 detachably coupled to the end of the sleeve 120 in order to indirectly couple the tool to the sleeve 120 without indirect coupling. .

The adapter 170 is detachably coupled to an end of the sleeve 120 protruding to one end of the main body 110. That is, the adapter 170 is disposed in the same direction as the longitudinal direction of the main body 110 in a bar shape and is coupled to the protruding end of the sleeve 120.

The adapter 170 may couple the tool while being detachably coupled to the sleeve 120. Therefore, the other end (sleeve side) of the adapter 170 is formed with a sleeve coupling groove 171 to which the protruding end of the sleeve 120 is detachably coupled. One end of the adapter 170 (the other side of the sleeve) is formed with a tool engaging groove 172 for engaging the tool.

The protruding end (one end) of the sleeve 120 is formed with an adapter coupling portion 125 to which the adapter 170 is coupled. Adapter coupling portion 125 is formed to a diameter smaller than the outer diameter of the sleeve 120 to form a step 126. That is, when the adapter 170 is coupled to the sleeve 120, the end of the adapter 170 is caught by the step 126 so that the sleeve 120 is inserted into the sleeve coupling groove 171 of the adapter 170 by a predetermined depth or more. Prevents losing

It comprises an adapter coupling means for coupling the adapter 170 to the protruding end of the sleeve 120.

Adapter coupling means is a fastening groove 127 formed on the outer periphery of the protruding end of the sleeve 120, a fastening hole 173 is formed through the sleeve coupling groove 171 in the outer peripheral of the adapter 170, and the fastening hole ( 173 and the fastening member 180 fastened to the fastening groove 127 is configured. The fastening hole 173, the fastening groove 127, and the fastening member 180 may be formed of at least one or more.

The distance from the step 126 of the sleeve 120 to the fastening groove 127 is formed equal to the distance from the end of the adapter 170 to the fastening hole 173. That is, when the adapter coupling portion 125 of the sleeve 120 is inserted into the sleeve coupling groove 171 of the adapter 170 so that the end of the adapter 170 is caught in the step 126, the coupling hole 173 and the coupling groove This is to allow 127 to communicate with each other.

The fastening member 180 has a screw thread formed to be screwed into the fastening hole 173 and the fastening groove 127 on an outer circumferential surface thereof, and a tool groove to which the tool is coupled is formed at an upper portion thereof.

The adapter 170 includes tool locking means for locking the tool inserted into the tool coupling groove 172 so as not to be pulled out.

The tool locking means includes a locking hole formed through the tool coupling groove 172 at the outer circumference of the adapter 170 and a locking member fastened to the locking hole to fix the tool fitted into the tool coupling groove 172. do. A screw thread is formed on the inner circumference of the locking hole so that the locking member can be fixed by screwing.

6 is a perspective view showing another form of a sleeve in a tool holder for a machine tool according to an embodiment of the present invention.

The other shape of the sleeve 120-1 shown in FIG. 6 is composed of a sleeve 120-1 of two parts by separating the sleeve 120 of one part, and the sleeve first body 120-1a. ), And the sleeve second body 120-1b.

Here, when the sleeve 120 of one component is separated into the sleeve 120-1 of two components, the sleeve 120 of the one component is separated based on the protrusion 121 of the sleeve 120 described above. This is to allow the elastic body 130 to be easily fitted without being caught by the protrusion 121 when the elastic body 130 is fitted to the outer circumference of the sleeve 120.

That is, one sleeve on which the protrusion 121 is not formed is called a sleeve first body 120-1a, and the other sleeve on which the protrusion 121 is formed is called a sleeve second body 120-1b.

The sleeve first body 120-1a is formed in a pipe shape of a predetermined length. An adapter 170 is fitted to one end of the sleeve first body 120-1a, and the second sleeve body 120-1b is screwed to the other end. Therefore, a thread is formed inside the other end of the sleeve first body 120-1a. At the other end of the sleeve first body 120-1a, the support part is spaced apart from the end to protrude to prevent the elastic body 130 fitted on the outer circumference thereof from moving toward one end.

The outer circumference of the sleeve first body (120-1a) is formed with the same locking grooves of the locking groove 122 of the sleeve 121, which is the same as the locking groove 122 of the sleeve 121 described above in detail The description will be omitted.

The sleeve second body 120-1b is accommodated in the large diameter part 112 when the sleeve second body 120-1b is fitted to the through hole 111 of the main body 110 in combination with the sleeve first body 120-1a. A protrusion 121 is formed at one end of the outer circumference of the sleeve second body 120-1b. At one end of the sleeve second body 120-1b, a coupling protrusion 120-1c having an outer diameter smaller than the outer diameter is protruded. A screw thread is formed on the outer circumference of the coupling protrusion 120-1c, and screwed to the screw thread formed inside the sleeve first body 120-1a.

7 is a perspective view showing another form of the sleeve in the tool holder for a machine tool according to an embodiment of the present invention.

Another form of the sleeve 120-2 shown in FIG. 7 is composed of a sleeve 120-2 having two parts by separating the sleeve 120 having one component, and the sleeve first body 120-. 2a) and the sleeve second body 120-2b.

Another form of the sleeve 120-2 is composed of two parts, namely, a sleeve first body and a sleeve second body in the same manner as the sleeve 120-1 shown in FIG. And is coupled to the outside of the sleeve without. Therefore, the sleeve 120-2 is composed of a sleeve first body 120-2a and a sleeve second body 120-2b.

The sleeve first body 120-2a may have the same size as the sleeve 120 of the tool holder shown in FIGS. 1 to 5, but the sleeve second body 120-2a may be coupled to the outer circumference of the other end. The connection groove 120-2c having an outer diameter smaller than the outer diameter of the sleeve 120 is formed.

The connection groove 120-2c is formed from the other end of the sleeve 120 to the protrusion 121, and forms a step in a portion where the protrusion 121 is formed.

The outer circumference of the first body of the sleeve (120-2a) is formed with the same engaging groove 122 of the engaging groove 122 of the sleeve 121, which is the same as the engaging groove 122 of the sleeve 121 described above in detail The description will be omitted.

The sleeve second body 120-2b is inserted into and coupled to the outside of the connecting groove 120-2c of the sleeve first body 120-2a in a pipe shape. Therefore, the inner diameter of the sleeve second body 120-2b is larger than the outer diameter of the connection groove 120-2c.

The outer diameter of the sleeve second body 120-2b is smaller than the inner diameter of the large diameter portion 112 of the through hole 111, and one end of the outer circumferential portion protrudes from the inner diameter.

The sleeve second body 120-2b may be coupled to the outer circumference of the connecting groove 120-2c of the sleeve first body 120-2a, and may be coupled by an interference fit or coupled by an adhesive. In addition, a thread is formed inside the sleeve second body 120-2b, and a thread is formed on the outer circumference of the coupling groove 120-2c to replace the sleeve second body 120-2b with the sleeve first body 120-b. It may be coupled to the connection groove portion 120-2c of 2a by screwing.

6 to 7, by forming a sleeve composed of one component of the two parts, it is possible to reduce the defects during manufacturing, it is effective in reducing the cost, it is possible to facilitate the assembly of the elastic body.

100: tool holder
110: main body
111: through hole 112: large diameter part
120, 120-1, 120-2: sleeve
120-1a, 120-2a: sleeve first body
120-1b, 120-2b: sleeve second body
120-1c: coupling protrusion
120-2c: connecting groove
121: protrusion 122: locking groove
125: adapter coupling portion 126: step
127: fastening groove
130: elastomer
140: elastic support member 141: coupling portion
141a: fitting groove 142: support protrusion
150: locking member
160: ball stopper
170: adapter 171: sleeve coupling groove
172: tool coupling groove 173: fastening hole
180: fastening member

Claims (8)

A main body having a through hole penetrating both ends in a longitudinal direction, and having a large diameter portion having an inner diameter larger than an inner diameter of the through hole at one end of the through hole;
A sleeve having one end inserted into one end of the through hole, one end protruding to the other end of the through hole, and a protruding portion formed on an outer circumference of the other end such that the other end is caught by the large diameter portion;
At least one elastic body fitted into the sleeve and coupled to the protrusion to absorb and reduce the load generated between the tool and the object;
An elastic support member coupled to one end of the through hole to pressurize the elastic body to adjust elasticity of the elastic body;
Comprising a tool holder for a machine tool. The method of claim 1,
The elastic support member,
A ring-shaped coupling portion screwed to an inner circumference of one end of the through hole in which the large diameter portion is formed;
A support protrusion protruding from the coupling part into the through hole to support the elastic body;
Comprising a tool holder for a machine tool.
The method of claim 2,
At least two fitting grooves are formed on a surface facing outward from the coupling portion to which a tool for rotating the elastic support member is screwed for screwing the elastic support member. The method of claim 1,
At least one engaging groove is formed on the inner circumferential surface of the through-hole and the outer circumferential surface of the sleeve so as to face each other to form a locking space.
At least one locking member is accommodated in the locking space and configured to prevent the sleeve from rotating in the through hole of the main body. The method of claim 1,
A tool holder for a machine tool, the tool holder being detachably coupled to one end of the sleeve protruding to the other end of the main body, the adapter further comprising an adapter for engaging the tool. The method of claim 5,
Adapter coupling means,
An adapter coupling portion formed with a step with a diameter smaller than an outer diameter of the sleeve so that the adapter is fitted into the protruding end of the sleeve;
A coupling groove for the sleeve formed at one end of the adapter to fit the adapter coupling portion of the sleeve;
Fastening grooves formed on the outer circumference of the adapter coupling portion;
A fastening hole communicating with a coupling hole for a sleeve at an outer periphery of the adapter and communicating with the fastening groove;
A fastening member fastened to the fastening hole and the fastening groove;
Comprising a tool holder for a machine tool. The method of claim 1,
The sleeve,
On the basis of the protrusion is divided into two,
A sleeve first body formed in a pipe shape, one end of which penetrates the through hole and protrudes into one end of the main body, and the other end of which is accommodated in the through hole;
A tool holder for a machine tool comprising a sleeve second body which is formed to extend in the lengthwise direction from one end to the inner side of the other end of the sleeve first body, and the second body is formed on the outer periphery of the first end. The method of claim 1,
The sleeve,
On the basis of the protrusion is divided into two,
A sleeve first body having a pipe shape, one end of which penetrates the through hole and protrudes to one end of the main body, and the other end is accommodated in the through hole, and a connecting groove having an outer diameter smaller than the outer diameter of the sleeve is formed on the outer circumferential surface thereof;
A tool holder for a machine tool comprising a sleeve second body fitted to the outer periphery of the connecting groove of the sleeve first body and having the protrusion formed on the outer periphery of one end.

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