JPH07299614A - Tool - Google Patents

Abstract

PURPOSE:To accurately perform aligning, and improve work accuracy by inserting and pulling an inserting member composed of a hollow structure of a tool in a taper hole of a main spindle, bringing it into close contact with an inner peripheral surface of the taper hole by expanding an outside diameter of the inserting member, and bringing a contact surface of the tool into contact with an end surface of the main spindle. CONSTITUTION:When a tool 5 is installed on a main spindle 2, first of all, an inserting part 23 of a tool body 6 is inserted in a taper hole 3 of the main spindle 2, and this large diameter base part is brought into contact with an inner peripheral surface 3a of the taper hole 3. Next, a pulling lever 41 is pulled in through a pull stud 9 by a pulling tool 4 arranged inside of the main spindle 2, and a ball 47 is pushed by a pushing surface 45, and is sandwiched between a receiving wall 32 and a receiving surface 28. In succession, an inserting member 24 is pulled in a deep part of the taper hole 3, and after a rear surface 10a of a collar part 10 is brought into contact with a front end surface 2a of the main spindle 2, a tip part of the inserting member 24 is push-opened, and a contact surface 26 is brought into contact with the inner peripheral surface of the taper hole 3. Thereby, the tool 5 is made to accurately coincide with the axis of the main spindle 2, and is rotated, and work can be accurately performed, and lateral vibration generated by a bend of the tool 5 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool for cutting such as a milling cutter, and more particularly to a structure of a mounting portion for mounting the tool on a spindle of a machine tool.

[0002]

2. Description of the Related Art Technical matters relating to this type of tool are disclosed in, for example, Japanese Patent Laid-Open No. 5-337769. The contents of the publication are as described in the following "Public technology column". Note that FIG. 1 in the above publication is shown as FIG. 6 in order to distinguish it from FIGS. 1 to 5 showing an embodiment of the present application in the accompanying drawings.

Publicly-known technology section "(Omitted) ... 1-4 show the structure of a well-known machine tool, 1 is a frame, 2 is a rotatable spindle, and 3 is provided at the front end of the spindle. Tapered holes 4 indicate pulling tools, respectively. Next, 5 shows a tool. In this example, a tool provided with a mounting portion for the spindle is shown, but it may be a tool that is held by a tool holder and has a mounting portion for the spindle. Reference numeral 6 indicates a main body of the tool. Reference numeral 7 denotes a cutting blade for cutting a work, which is provided at the front end portion of the main body 6, and a plurality of, for example, three cutting blades are provided around the front end portion.
Reference numeral 8 denotes a shank portion provided at the rear end portion of the main body 6, which is formed in a tapered shape corresponding to the tapered hole 3. Reference numeral 9 denotes a pull stud attached to the rear end of the main body 5. Reference numeral 10 denotes a collar portion provided on the outer periphery of the main body 6, which is a portion to be gripped by the grip portion of the tool changer, and is provided with a groove 11 for fitting a gripping tool. Further, the collar portion 10 has a rear surface 10a and a front end surface 2a of the spindle 2.
It is provided at a position where a gap can be formed between the gap and the gap, and the gap serves as a gap for interposing a vibration isolator described below.
.. (Omitted) ... Next, 15 indicates a vibration isolator attached to the rear surface 10a of the collar portion 10 .... (Omitted) ... The vibration isolator 15 is formed of rubber or another elastic material. .. (Omitted) When using the above-mentioned structure, the shank portion 8 is inserted into the tapered hole 3, and the pull stud 9 is pulled in by the pulling tool 4. .. (Omitted) The shank portion 8 is fitted into the tapered hole 3 by the above-described retraction. The vibration isolator 15 is ... (Omitted) ...
The holders 17 are also interposed between 2a and the rear surface 10a.・ ・
(Omitted) ································································································································································································································································ When mounting the work W in the direction of the arrow 21 It is performed by moving it relative to.・ ・ (Omitted) ・ ・

In the above-described structure, since the outer peripheral surface of the shank portion 8 closely adheres to the inner peripheral surface of the tapered hole 3 when the tool 5 is attached to the main shaft 2, the main shaft 2 and the tool 5 are The mutual axes coincide with each other with extremely high precision.
Therefore, in the case of the above cutting work, the tool 5 can be rotated in a high precision state with the axial accuracy of the rotation of the main shaft 2 being the same, and high precision machining can be performed. Further, in the case of the above cutting work, even if a large force is applied to the tool 5 in the direction of bending it with respect to the spindle 2 due to the cutting resistance exerted on the cutting edge 7, the front end surface 2a of the spindle and the rear surface 10a of the collar portion 10 Since the vibration isolator 15 having a high rigidity as described above is interposed between them, a large resistance force against the bending force as described above is exhibited. As a result, the bend is prevented, the lateral vibration associated with the bend is prevented in the rotating tool 5, and the cut surface of the work W can be made smooth and in a good condition without rough skin.

[0005]

However, in the conventional structure described above, when the spindle 2 is rotated at a high speed for machining, the spindle 2 is rotated by the centrifugal force generated by the high speed rotation.
And the inner diameter of the tapered hole 3 increases. Then, the shank portion 8 is pulled toward the deep portion of the tapered hole 3 by the pulling force constantly applied from the pulling tool 4 to the shank portion 8. That is, when the inner diameter of the taper hole 3 is increased by increasing the diameter of the main shaft 2, the pressure contact force of the outer peripheral surface of the shank portion 8 with respect to the inner peripheral surface of the taper hole 3 is weakened, and the vibration isolator 15 from the front end surface 2a and the rear surface 10a. The pressure applied to is increased. Then, the increased pressure causes the vibration isolator 15 to be further compressed, and the rear surface 10
a moves toward the front end face 2a. That is, the shank portion 8 is drawn toward the deep portion of the tapered hole 3. The retraction is performed until the outer peripheral surface of the shank portion 8 comes into pressure contact with the inner peripheral surface of the enlarged tapered hole 3 again to increase the pressure contact force. The tool 5 is moved to the spindle 2 side by such retraction. This movement causes the following problems. One is that the tool 5 retracts toward the spindle 2 side, so the tool 5
Is a problem that the cutting depth of the workpiece W is reduced, that is, a problem that the machining dimension accuracy of the workpiece W is reduced. The other is that when the machining is completed and the rotation of the main shaft 2 is stopped, the centrifugal force disappears and the main shaft 2 receives a force to reduce the inner diameter of the tapered hole 3 due to its elastic restoring force. Occur. Then, due to the force, the inner peripheral surface of the tapered hole 3 tightens the outer peripheral surface of the shank portion 8 with a large force. as a result,
This is a problem that the tool 5 cannot be removed from the spindle 2.

The tool of the present invention is provided to solve the above-mentioned problems (technical problems) of the prior art. A first object of the present invention is to provide a tool which can be mounted in a state in which the axes of the two spindles coincide with each other with high accuracy when the tool can be mounted on the spindle. A second object is to provide a tool capable of increasing resistance to a force for bending the tool against the spindle when machining with the tool attached to the spindle. A third object is to provide a tool capable of maintaining a fixed positional relationship of the tool with respect to the spindle in the axial direction even if the diameter of the spindle is increased by centrifugal force due to high-speed rotation of the spindle. is there. A fourth object is to provide a tool capable of always maintaining the coincidence state of the axis of the tool with respect to the spindle even when the diameter of the spindle is increased as described above. A fifth object of the present invention is to provide a tool capable of preventing the tool from being tightened with a large force by the spindle even if the enlarged diameter is reduced by stopping the high speed rotation of the spindle. Other objects and advantages will be readily apparent from the drawings and the following description related thereto.

[0007]

In order to achieve the above object, the tool according to the present invention is integrally provided at one end in the axial direction of the main body with an inserting member for inserting into a tapered hole in a spindle of a machine tool. At the same time, the outer periphery of the insertion member is formed into a contact surface by forming a taper shape so as to be in close contact with the inner peripheral surface of the tapered hole, while the other end in the axial direction of the main body is provided with a cutting edge for cutting a workpiece or A cutting blade mounting portion is provided, and an overhanging portion is further provided on the outer periphery of the main body, and the overhanging portion of the spindle is in contact with the inner peripheral surface of the tapered hole. A tool for connecting a connecting member with a pulling tool provided in the deep portion of the tapered hole to the inserting member, which is provided with a contact surface for contacting the end face, and the inserting member and the connecting member. The structure of the connection of is the shaft core part of the insertion member, the inner peripheral surface While providing a hollow portion having a tapered receiving surface facing the main body side, the connecting member is provided with a pulling rod having an outer peripheral surface having a tapered pressing surface facing the connecting member side, and The pull rod is positioned in the hollow portion of the insertion member such that the pressing surface faces the receiving surface and is movable back and forth in the axial direction, and further between the receiving surface and the pressing surface around the pressing surface. Is a plurality of balls for transmitting a pressing force from the pushing surface to the receiving surface, and the connecting member pulls the pulling rod toward the opposite body side, so that the receiving surface is pushed from the pushing surface through the balls. In addition, a force for pulling the insertion member to the side opposite to the main body and a force for enlarging the diameter of the insertion member are applied.

[0008]

When the insertion member is inserted into the tapered hole of the main shaft and the pulling rod is pulled by the pulling tool through the connecting member, the pulling force is applied from the pushing surface of the pulling rod to the receiving surface of the insertion member through the ball. In this case, since the push surface and the receiving surface are tapered surfaces, the receiving surface receives a force in a direction parallel to the pulling direction and a force in a direction of expanding the radius of the insertion member. The former member pulls the insertion member toward the deep portion of the tapered hole, and the abutting surface of the overhanging portion abuts the end surface of the main shaft. The latter force causes the diameter of the insertion member to be enlarged, and the abutment surface of the outer periphery is brought into close contact with the inner peripheral surface of the tapered hole, so that the axis of the main shaft and the axis of the tool coincide with each other. When the workpiece is cut by the tool by rotating the spindle, the abutment of the present surface with the end surface of the spindle increases the resistance to the force applied laterally to the tool. When the inner diameter of the tapered hole increases due to the centrifugal force generated by the high-speed rotation of the main shaft, the abutment of the present surface against the end surface of the main shaft prevents the tool from retracting toward the main shaft side.
Further, in this case, the pulling rod is further pulled by the pulling tool so that the diameter of the inserting member is enlarged and the contact state of the contact surface with the inner peripheral surface of the tapered hole is maintained, and the shaft center of the main shaft and the shaft center of the tool are maintained. The match condition of is maintained. When the centrifugal force disappears due to the stop of the main shaft, the inner peripheral surface of the tapered hole tightens the outer peripheral surface of the insertion member with a large force by the elastic restoring force of the main shaft. However, when the pulling rod is released and then returned, the insertion member is released from its enlarged diameter state and the diameter is reduced. As a result, the tightening with the above large force can be released.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. The members denoted by reference numerals 2, 5 and 6 in FIG. 1 respectively indicate a spindle, a tool, and a main body of the tool in a known configuration (known in Japanese Patent Laid-Open No. 5-337769, for example). The relationship between each of these members and their relationship with other members is the same as the structure related to each of the corresponding members and their relationship with other members described in the above-mentioned publicly known art section. In FIGS. 1 to 5, parts that are functionally the same as or equivalent to those shown in FIG. 6 and whose description is considered redundant will be assigned the same reference numerals as in FIG. 6 and redundant description will be omitted. Next, the gradient of the inner peripheral surface 3a of the tapered hole 3 is a gradient of a size usually called 7/24 taper. Further, the projecting portion on the outer periphery of the main body 6 of the tool is a portion projecting outward in the radial direction from the opening of the taper hole 3. For example, in this example, the projecting portion is the collar portion.
An example is shown in which the rear surface 10a of the collar portion 10 serves as the abutting surface for contacting the end surface 2a of the main shaft 2 at the projecting portion. In the following, the collar portion 10 is also referred to as an overhang portion, and the rear surface 10a is also referred to as the present surface.

Next, the details of the tool 5 will be described.
Reference numeral 22 is a through hole provided in the shaft core portion of the main body 6 for attaching a holding member 30 described later, so that it penetrates to the front end of the main body 6 (the end on the side where the cutting blade 7 is provided in FIG. 6). The internal thread groove is formed on the inner peripheral surface. Reference numeral 23 denotes an insertion portion provided at the rear end of the main body 6 for insertion into the tapered hole 3. Reference numeral 24 denotes a plug-in member of the plug-in portion 23, which is formed integrally with the main body 6 and is formed in a hollow cylindrical shape so that the diameter can be enlarged and reduced. Reference numeral 25 denotes a hollow portion provided in the shaft core portion. Reference numeral 26 denotes an outer peripheral surface which is an abutting surface for closely contacting the inner peripheral surface 3a of the tapered hole 3, and is a tapered surface having a steeper slope than the inner peripheral surface 3a of the tapered hole 3. Reference numeral 27 denotes a recess provided on the inner peripheral surface of the base portion 24a of the insertion member 24, which is formed for the purpose of retracting the ball 47 during assembly and thinning the base portion 24a of the insertion member 24, In this example, a large number of balls 47
In order to allow the holding member 30 holding it to rotate with respect to the main body 6, it is formed as a concave groove over the entire length of the inner circumference. 28 is a receiving surface for receiving the force transmitted from the ball 47, and is formed on the taper surface facing the body 6 as shown so as to receive the force in the radial direction and the force in the direction of the axis 5a. . The angle of the receiving surface 28 with respect to the axis 5a is formed, for example, at about 60 degrees so that the component of the force transmitted from the ball 47, for example, in the axial direction increases.

Next, 30 is a holding member for holding a plurality of balls in the circumferential direction at regular intervals, and is provided with a large number of holding recesses 31 arranged side by side in the circumferential direction as shown in FIG. 32 is the above receiving surface 28
An example of a receiving wall for preventing the ball 47 from escaping from the gap between the pressing surface 45 and a pressing surface 45 described later, which has a bottom surface of the recess 31 is shown. Reference numeral 33 denotes a recess formed for receiving and holding a retracting rod described later. Reference numeral 34 denotes a connecting portion to the main body 6, and a male screw groove which is screwed into the female screw groove of the through hole 22 is formed on the outer peripheral surface. Reference numeral 35 denotes a fitting portion for fitting a tool for rotating the member 30, which is formed, for example, as a hexagonal hole. Reference numeral 36 denotes a fixing member for fixing the holding member 30 to the main body 6, and the shaft core has a fitting hole 37 for fitting a tool for rotating the fixing member 36, for example, the fitting portion 35 and A similar hexagonal hole is provided.

Next, 40 is a pull-in tool at the insertion portion 23, which is the pull stud 9 which is a connecting member with the pull-in tool 4 in the main shaft 2.
And a pull rod 41 connected thereto. 41a shows the screw connection part of both. Reference numerals 42 and 43 are parts for positioning (radial positioning) and holding of the pull rod 41 with respect to the insertion member 24, in a state where the pull rod 41 is positioned substantially coaxially with the main body 6 of the tool 5. It is designed to be retained by the insertion member 24
On the other hand, the outer peripheral surface is a straight cylindrical surface so that it can move back and forth in the direction of the axis 5a. Reference numeral 44 denotes a recess for holding the ball 47, which is provided on the outer peripheral surface of the pull rod 41, and surrounds the pull rod 41 to enable relative rotation of the pull rod 41 with respect to the holding member 30 holding the ball 47. Is formed as a concave groove extending over the entire length of. 45 is a pressing surface for giving a pressing force to the ball 47,
In order to transmit the force in the radial direction and the force in the axial direction, a taper surface facing the pull stud 9 side is formed on the side opposite to the main body 6 as shown. The angle of the pressing surface 45 with respect to the axis 5a is
The ball 47 is formed at about 15 degrees so that a sufficiently large radial force can be transmitted to the ball 47. Ball 47 is push surface 45
A member for transmitting the pressing force from the to the receiving surface 28.There are many evenly spaced around the pressing surface 45 so that the force can be uniformly applied to the receiving surface 28 in any part of the periphery of the pressing surface 45. It is arranged in. It should be noted that the insertion member 24, the holding member 30, the pull rod 41, the ball 47 and the like are all made of a hard material, such as steel, which has sufficient strength and is generally known in this type of tool. Further, the cutting edge 7 of FIG. 6 is provided at the other end of the main body 6 of the tool 5 in the direction of the axis 5a. Instead of the cutting edge, a mounting portion for detachably attaching the cutting edge is provided. May be.

Reference numerals 36, 30, 47 in the tool having the above structure
Assembly of the member indicated by 40 will be described. First, the fixing member 36 is screwed into the through hole 22 through the hollow portion 25 to a slightly deeper position (a position on the right side of the position shown in FIG. 1), and then the holding member 30 is inserted into the hollow portion 25 and the connecting portion 34 is inserted. Screw on.
Similarly, the holding member 30 is also inserted into the hollow portion 25 to a slightly deeper position. Next, a large number of balls 47 are loaded into the recess 31. At this time, a large number of balls 47 are positioned in the recesses 27 so that a space having a size capable of passing the portion 43 of the pulling rod 41 of the pulling tool 40 is formed on the inner peripheral side thereof. Next, in that state, the pull rod 41 to which the pull stud 9 is previously attached (may be attached later) is inserted through the hollow portion 25 of the insertion member 24 toward the recess 33 of the holding member 30. Next, the holding member 30
A tool (for example, a rod having a hexagonal cross section) for rotating is inserted into the through hole 22 from the front end side of the main body 6 and fitted into the fitting hole 37 and the fitting portion 35, and the holding member 30 is held with the tool. Then, the fixing member 36 is rotated to move the holding member 30 toward the receiving surface 28 side until the ball 47 is sandwiched between the receiving wall 32 and the receiving surface 28. In this case, the fixing member 36 also advances in parallel. Next, the tool is slightly pulled back to the front end side of the main body 6 so that the tip end thereof is fitted only in the fitting hole 37 of the fixing member 36, and the fixing member 36 is rotated by the tool to rotate the connecting portion 34.
The holding member 30 is fixed to the main body 6 by the double nut action of. This completes the assembly.

The attachment of the tool 5 to the spindle 2 in the above structure will be described. As shown in FIG. 1, the insertion portion 23 is inserted into the tapered hole 3. At this time, as shown in FIG. 5, the outer peripheral surface of the portion 24a ′ having the largest outer diameter in the base portion 24a of the insertion member 24 contacts the inner peripheral surface 3a of the tapered hole 3. Between the outer peripheral surface of the tip portion 24b and the inner peripheral surface 3a of the tapered hole 3 and the end surface 2a of the spindle 2.
There is still a gap between each of them and the immediate side 10a of the overhang portion 10. In this state, the pull stud 9 is pulled by the pulling tool 4 as is well known. The pulling force causes the pull rod 41 to move to the arrow in FIG.
When moving in the direction 51 (direction parallel to the axis 5a), the pushing surface 45 pushes the ball 47 radially outward as indicated by the arrow 52, and the ball 47
Is sandwiched between the push surface 45, the receiving wall 32, and the receiving surface 28, and they are integrated. Reference numerals 45a, 32a, and 28a indicate contact portions with the ball 47, respectively. In the integrated state, the pushing surface 45 causes the ball 47 to move by the force applied to the pull rod 41 in the direction of the arrow 51 by the pull tool 4.
Press the receiving surface 28 via. In this case, since the pressing surface 45 and the receiving surface 28 are tapered surfaces, the receiving surface 28, due to the above-mentioned force, has a force in a direction parallel to the axis 5a as shown by an arrow 53, and an arrow.
As shown by 54, it receives two forces, which are forces to spread in the radial direction.

When the receiving surface 28 receives the above-mentioned force, as one example, first, the inserting member 24 is pulled toward the deep portion of the inserting hole 3 by the force 53 in the axial direction, as shown in FIG. As described above, the contact surface 10a contacts the end surface 2a. In this case, the diameter of the base portion 24a of the insertion member 24 is slightly reduced by being pulled into the tapered hole 3. After the contact of the contact surface 10a with the end surface 2a,
Further, as the retracting tool 40 continues to be retracted, the tip portion 24b is expanded by the force 54 in the radial direction, and as shown in FIG.
The contact surface 26 on the outer peripheral side of 24b contacts the inner peripheral surface 3a of the tapered hole 3. As another example, the insertion member 24 is pulled toward the deep part of the insertion hole 3 so that the contact surface 10a abuts on the end surface 2a, and the tip portion 24b is expanded to abut on the outer peripheral side thereof. The contact of the surface with the inner peripheral surface of the tapered hole 3 is performed in parallel. Note that these functions are such that the diameter of the insertion member 24 can be easily expanded or reduced (due to the difference in the material forming the insertion member 24 or the difference in thickness), the contact surface 26 and the inner peripheral surface 3a.
Depending on the size of the gradient between the two, the size of the gap between the end surface 2a and the contact surface 10a in the case of the state of FIG. 1, and the size of the inclination angle of the pressing surface 45 and the receiving surface 28, the former case and the latter case It may be done as follows.

A case will be described in which the main shaft 2 is rotated and the workpiece is machined by the tool 5 in the mounted state. In the mounted state, the insertion member for the inner peripheral surface 3a of the tapered hole 3
Due to the close contact of the contact surfaces 26 of 24, the axis of the spindle 2 and the axis of the tool 5 are exactly aligned. Therefore, the tool 5 can be rotated in a high-precision state with the accuracy of the axis of rotation of the spindle 2 unchanged, and high-precision machining can be performed.

Further, since the rear surface 10a of the collar portion 10 is in pressure contact with the front end surface 2a of the spindle, even if a large force is applied to the tool 5 in the direction of bending the tool 5 with respect to the spindle 2, It shows a large resistance and can prevent the above bend. Therefore, in the tool 5 which is rotating, it is possible to prevent lateral vibration due to the bend, and it is possible to perform high-precision machining on the work.

High-speed rotation of the spindle 2 (eg, ??? rpm)
Even if the diameter of the main shaft 2 increases due to centrifugal force,
Since the rear surface 10a of 10 is in contact with the front end surface 2a of the main shaft 2,
The positional relationship of the tool 5 with respect to the spindle 2 in the axial direction can be kept constant. Therefore, the working depth of the workpiece by the tool 5 (the cutting depth in the axial direction of the tool 5) can be maintained at a predetermined depth.

In the above case, when the inner diameter of the tapered hole 3 increases, the outer diameter of the base portion 24a of the insertion member 24 follows and expands due to the elastic restoring force against the compression. Further, in the tip portion 24b, the pulling force in the direction of the arrow 51, which is constantly applied from the pulling tool 4 to the pulling rod 41, transmits and moves the force in the directions of the arrows 52 and 54 described above, and the taper hole 3 As the inner diameter increases, the outer diameter of the tip portion 24b follows and expands. In this way, the contact surface of the insertion member 24 against the inner peripheral surface 3a of the tapered hole 3
26 close contact is maintained. As a result, it is possible to maintain the same state of the axes of the spindle 2 and the tool 5 as described above.

When the high speed rotation of the main shaft 2 is stopped,
The centrifugal force disappears, and a force for reducing the inner diameter of the tapered hole 3 is generated on the main shaft 2 due to its elastic restoring force. As a result, the inner peripheral surface 3 a of the taper hole 3 becomes the outer peripheral surface 26 of the insertion member 24.
Tighten. However, when the tool 5 is removed from the spindle 2, when the pulling tool 4 is loosened, the pull rod 41 returns in the direction opposite to the arrow 51 direction, and as a result, the front end of the enlarged insertion member 24 is pulled.
The outer diameter of 24b is restored (reduced) to the state shown in FIG. In this state, the base of the insertion member 24 that is elastically compressed
Since the outer peripheral surface of 24a is only in pressure contact with the inner peripheral surface of the tapered hole 3 due to its elasticity, the pressure contact force between the outer peripheral surface of the base portion 24a and the inner peripheral surface 3a of the tapered hole 3 is not so large. Therefore, the insertion member 24 can be pulled out from the tapered hole 3 with a relatively small force, and the tool 5 can be easily removed from the spindle 2.

Next, the receiving wall 32 is moved from the pressing surface 45 to the ball 47.
When a pressing force is applied to the receiving surface 28 via the ball 47
Is a wall for preventing escape from between the pressing surface 45 and the receiving surface 28, and the depth of the recessed portion 27 or the recessed portion 44 may be different from that of this example, or When the inclination angle is selected to be different from that of this example, the wall 32 may be formed by the inner peripheral surface of the portion indicated by reference numeral 27a in FIG. 5, or the outer peripheral surface of the portion indicated by reference numeral 44a in FIG. You may comprise. In these cases, the holding member 30 is not used.

[0022]

As described above, according to the invention of the present application, when the first to fifth objects are achieved by the constitutions described in the claims and the tool 5 is attached to the spindle 2, the workpiece 2 is machined. In contrast, the axial center of the tool 5 is always accurately matched, the positional relationship of the tool 5 with respect to the spindle 2 in the axial direction is always fixed, and the lateral vibration of the tool 5 is prevented by preventing the tool 5 from bending against the spindle 2. Therefore, there is an effect that the workpiece can be processed with high precision. Moreover, when the tool 5 is removed from the spindle 2 after the machining is completed, there is an effect that the removal can be easily performed.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a state in which a tool insertion portion is inserted into a tapered hole of a spindle.

FIG. 2 is a view showing a holding member and a ball.

FIG. 3 is a partial view showing a state in which the abutment surface of the overhang portion comes into contact with the end surface of the main shaft due to the retraction of the retraction tool.

FIG. 4 is a partial view showing a state in which the contact surface on the outer periphery of the insertion member is brought into close contact with the inner peripheral surface of the tapered hole by retracting the retractor.

FIG. 5 is an enlarged cross-sectional view for explaining the transmission of force by retracting the retracting tool.

FIG. 6 is a partially cutaway view showing a state in which a tool is attached to a spindle of a machine tool.

[Explanation of symbols]

 2 Spindle 3 Tapered hole 5 Tool 6 Body 24 Insert member 28 Receiving surface 41 Pull rod 45 Pushing surface 47 Ball

Claims (1)

[Claims] 1. An insert member for inserting into a taper hole in a spindle of a machine tool is integrally provided at one end of an axial direction of a main body, and an outer periphery of the insert member is in close contact with an inner peripheral surface of the taper hole. To form a contact surface, the cutting edge for cutting a work or a mounting portion of the cutting edge is provided at the other end of the main body in the axial direction, and the outer circumference of the main body is extended. The protruding portion is provided with a contact surface for contacting the end surface of the spindle in the contact state of the contact surface with the inner peripheral surface of the taper hole, and the insertion member has In the tool for connecting the connecting member with the pulling tool provided in the deep portion of the tapered hole, the connecting member and the connecting member have a structure in which the shaft core portion of the inserting member has an inner circumference. The surface is provided with a hollow portion having a tapered receiving surface facing the body side, while The connecting member is provided with a pulling rod provided on the outer peripheral surface thereof and having a tapered pushing surface facing the connecting member side, and the pulling rod has the pushing surface facing the receiving surface in the hollow portion of the inserting member. In a state and movable in the axial direction so as to be movable back and forth, and a plurality of balls for transmitting a pressing force from the pressing surface to the receiving surface are interposed between the receiving surface and the pressing surface around the pressing surface, When the pulling rod is pulled to the side opposite to the main body by the connecting member, the force for pulling the inserting member toward the side opposite to the main body and the diameter of the inserting member are increased from the pressing surface to the receiving surface via the balls. A tool characterized by applying force.