JPH05285715A - Tool holder mounting device - Google Patents

Abstract

PURPOSE:To improve rigidity remarkably and facilitate stack cutting by extending a datum end face of a main shaft and a calyx end face of a tool holder matching to it by necessary amounts so as to form extended end faces and attaching the tool holder to the main shaft in such a state of coinciding both extended end faces with each other. CONSTITUTION:A datum end face 1a of a main shaft 1 and a chuck end face 5a of a tool holder 3 are extended by necessary amounts of 1 and alpha2 respectively to form extended end faces 1b, 5b and then both extended end parts are coincided with each other. The tapered shank part 4 of the tool holder 3 is thus fitted closely into a tapered hole 2 of the main shaft 1, while the extended end face 5b of the tool holder 3 is fastened to the extended end face 1b of the main shaft 1. As a result, cutting load is received by both extended end faces 1b, 5b, that is, the cutting load is not received intensively by the part between the tapered hole 2 and the tapered shank part 4 but also received by the contact faces 1b, 5b between the tapered hole 2 and the tapered shank part 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holder mounting device for mounting a tool holder fitted to a cutting tool on a rotary spindle of a machine tool such as a machining center.

[0002]

2. Description of the Related Art Conventionally, an apparatus of this type is shown in FIG. This is one in which a tapered shank portion 4 of a tool holder 3 is fitted in a tapered hole 2 provided in a rotating or non-rotating main spindle (hereinafter, simply referred to as a main spindle) 1 of a machine tool.
According to the IS standard or the ISO standard, the maximum diameter D, the length L, etc. of the taper hole 2 and the taper shank portion 4 are standardized, and a certain manufacturing error (Δi) is taken into consideration, and the reference end surface 1a of the spindle 1 is considered. It is also standardized to provide a predetermined facing gap Y between the end surface 3a of the tool holder 3 and the flange end surface 3a.

According to the above construction, the reference end face 1a slightly projects toward the flange end face 3a due to the manufacturing error (Δi), or the flange end face 3a causes the manufacturing error (Δ), as shown by the phantom line in the figure.
Even if it slightly protrudes toward the reference end face 1a side due to i),
The opposing gap Y absorbs the manufacturing error (Δi) and the reference end face 1a and the flange end face 3a do not come into contact with each other. Therefore, the taper shank portion 4 is securely fitted into the taper hole 2. be able to.

However, the reference end surface 1a and the flange end surface 3a are
Are separated from each other, and the cutting load is taper shank 4
Since it is concentrated on the contact surface, the contact surface between the tapered hole 2 and the tapered shank portion 4 is easily worn by the fretting corrosion phenomenon or the like.

Therefore, the spindle 1 and the tool holder 3 are subjected to precision machining so that the existing reference end surface 1a of the spindle 1 is extended toward the flange end surface 3a by the facing gap Y (FIG. 6). The existing flange end face 3a is extended toward the reference end face 1a side by the amount of the facing gap Y (FIG. 7), and the taper hole 2 and the taper shank portion 4 are closely fitted to each other, and at the same time, the reference end face 1a and the flange portion are formed. It is conceivable that the end face 3a and the end face 3a are in close contact with each other. According to the above configuration, the cutting load is also applied to the reference end surface 1a, so that the contact surface between the taper hole 2 and the taper shank portion 4 is not worn due to the fretting corrosion phenomenon or the like.

However, when the spindle 1 and the tool holder 3 that have been subjected to this special precision processing are used in common with the tool holder 3 and the spindle 1 of the above-mentioned standard, a manufacturing error (Δi) is allowed in the standard. The problem arises from this being done.

That is, as shown by a phantom line in FIG. 6, a tool holder 3 of a normal standard in which the length of the taper shank portion 4 is slightly shortened due to a manufacturing error (Δi) on the spindle 1 which has been subjected to special precision machining. , Or as shown by the phantom line in FIG. 7, the tool holder 3 that has undergone special precision processing is attached to the standard spindle 1 in which the length of the tapered hole 2 is slightly longer due to the manufacturing error (Δi). In this case, since the flange end face 3a abuts the reference end face 1a before the taper shank portion 4 is closely fitted to the taper hole 2, a gap β is generated between the taper hole 2 and the taper shank portion 4. , Tool holder 3 on spindle 1
Cannot be securely attached.

[0008]

SUMMARY OF THE INVENTION Therefore, according to the present invention, in the case where the existing reference end surface of the main shaft or the existing collar end surface of the tool holder is extended by the facing gap between them, the standard tool holder or Since it cannot be used as a main axis, it aims to solve this.

[0009]

The structure of the present invention for achieving the above object will be described with reference to the drawings attached to the embodiments of the present invention. In the present invention, the tapered hole 2 provided in the rotating or non-rotating main shaft 1 is used. Fit the taper shank 4 of the tool holder 3,
A tool holder mounting device for mounting the tool holder 3 on the spindle 1 so that there is an allowable facing gap Y between the existing reference end surface 1a at the tip of the spindle 1 and the existing flange end surface 3a of the tool holder 3. In the above, the existing reference end surface 1a of the main shaft 1 and the existing collar end surface 3a of the tool holder 3 that faces the existing reference end surface 1a are extended by a required protrusion amount α in the mutually opposing direction and extended end surfaces 1b and 3b. Formed into a
A configuration is adopted in which the tool holder 3 is attached to the main shaft 1 so that the two extended end faces 1b and 3b are anastomosed with each other.

[0010]

According to the above construction, the reference end face 1a of the main shaft 1 and the flange end face 3a of the tool holder 3 are extended by a required protrusion amount α to form extended end faces 1b and 3b, and both extended end faces 1b are formed. , 3
Since b is anastomosed with each other, the tapered shank portion 4 of the tool holder 3 is closely fitted into the tapered hole 2 of the main spindle 1, and at the same time, the extended end surface 1b of the main spindle 1 is extended with the extended end surface of the tool holder 3. 3b can be closely attached. Therefore, the cutting load is also received by both the extension end faces 1b and 3b, and the cutting load is not concentrated between the taper hole 2 and the taper shank portion 4, and the taper hole 2 and the taper shank portion 4 are not applied. The contact surface between and is not worn by the fretting corrosion phenomenon or the like (see FIGS. 1 and 2).

Further, a tool holder 3 having a standard end face 1a of a normal standard is attached to the spindle 1 having the extended end face 1b formed by the special precision work of the present invention, or extended by the special precision work of the present invention. Even when the tool holder 3 having the end face 3b is attached to the spindle 1 having the standard reference end face 1a, the extended end face 1b or the reference end face 1a of the main shaft 1 and the flange end face 3a or the extended end face of the tool holder 3 are attached. A gap is formed between the taper shank portion 3 of the tool holder 3 and the taper shank portion 4 of the main spindle 1 so that a manufacturing error (Δi), which is normally allowed by the standard, is absorbed by the gap. It can be fitted (see FIGS. 3 and 4).

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a tool holder mounting device according to an embodiment of the present invention, in which a taper hole 2 provided in a spindle 1 is shown.
The taper shank portion 4 of the tool holder 3 is fitted to, and as shown in FIG. 2, the existing reference end surface 1a of the main spindle 1 and the existing collar end surface 3a of the tool holder 3 facing the existing reference end surface 1a. , The required protrusion amount α (one half of the facing gap Y in the normal standard) is extended in the opposing direction to form the extended end faces 1b and 3b, and the extended end faces 1b and 3b are anastomosed with each other. .. The protrusion amounts α are preferably the same, but the protrusion amounts α are not necessarily required, and the protrusion amounts α may be different from each other. The flange end surface 3 a is formed on the manipulator holding flange 5 of the tool holder 3.

According to the above construction, the tapered shank portion 4 of the tool holder 3 is closely fitted into the tapered hole 2 of the main spindle 1, and at the same time, the extended end surface 1b of the main spindle 1 is closely fitted to the extended end surface 3b of the tool holder 3. Since the special precision processing is performed as described above, the cutting load is also received by both the extending end faces 1b and 3b, and the cutting load may be concentrated between the taper hole 2 and the taper shank portion 4. Since it is not present, there is no fear that the contact surface between the tapered hole 2 and the tapered shank portion 4 will be worn due to the fretting corrosion phenomenon or the like.

Here, an example of concrete dimensions is JIS
In the standard part number BT50, the maximum diameter D of the tapered hole 2 and the tapered shank portion 4 is 69.850 mm, and the tapered hole 2
Has a length L of 100.8 mm and a facing gap Y of 3 mm, and the protrusion amount α of both extension end faces 1b and 3b with respect to the existing reference end face 1a or the flange end face 3a is 1.5 mm (ISO Almost the same size in the standard).

Next, a tool holder 3 having a flange end face 3a of a normal standard may be attached to the spindle 1 having the extended end face 1b formed by the special precision machining of the present invention (FIG. 3), and the special holder of the present invention may also be used. Even if the tool holder 3 on which the extended end face 3b is formed by precision machining is attached to the main spindle 1 having the standard reference end face 1a (FIG. 4) and used, the extended end face 1b or the reference end face 1a of the main spindle 1 is used. Between the flange end surface 3a or the extended end surface 3b of the tool holder 3 and a JIS standard part number BT50, a gap γ of 1.5 mm occurs, for example.
Since the manufacturing error (Δi) of 0.4 mm, which is normally allowed in the standard, is absorbed in the gap γ, the taper shank portion 4 can be fitted tightly and tightly to the taper hole 2.

[0016]

According to the present invention, the spindle and the tool holder need to be precisely machined, but since the extended end surfaces of the both can be anastomosed with each other, they can be attached, so that the spindle is tapered. The contact surface between the hole and the taper shank of the tool holder is not worn due to fretting corrosion phenomenon, etc., and the rigidity is extremely high, so heavy cutting can be easily performed, and moreover,
It can also be used for standard tool holders and spindles without losing compatibility.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the main part.

FIG. 3 is a vertical cross-sectional view showing a state in which a normal-standard tool holder is attached to the spindle of the present invention.

FIG. 4 is a vertical cross-sectional view of the tool holder of the present invention attached to a standard spindle.

FIG. 5 is a vertical sectional view of a conventional example.

FIG. 6 is a vertical cross-sectional view showing a modified example of the conventional example.

FIG. 7 is a vertical cross-sectional view showing another modification of the conventional example.

[Explanation of symbols]

 1 Spindle 1a Reference end face 1b Extended end face 2 Tapered hole 3 Tool holder 3a Collar end face 3b Extended end face 4 Tapered shank portion Y Opposed gap α Projection amount

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[Procedure amendment]

[Submission date] July 14, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

Title of the invention Tool holder mounting device

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holder mounting device for mounting a tool holder provided with a cutting tool on a rotating or non-rotating spindle of a machine tool such as a machining center with an automatic tool changing device.

[0002]

2. Description of the Related Art A tool holder 3 used in a manning center with an automatic tool changer of this kind is provided with a manipulator gripping collar 5 for automatic tool change adjacent to a tapered shank portion 4 as shown in FIG. Is formed in.
A tapered shank portion 4 of a tool holder 3 is fitted into a tapered hole 2 provided in a rotating or non-rotating main spindle (hereinafter simply referred to as a main spindle) 1 of a machine tool, and according to JIS standard or ISO standard, While standardizing the maximum diameter D, the length L, etc. of the taper hole 2 and the taper shank portion 4,
It is also standardized that a certain facing gap Y is provided between the reference end surface 1a of the spindle 1 and the end surface 5a of the existing collar portion 5 of the tool holder 3 in consideration of a certain manufacturing error (Δi).

According to the above construction, as shown by the phantom line in the figure, the reference end face 1a slightly projects toward the flange end face 5a due to the production error (Δi), or the flange end face 5a produces a manufacturing error (Δ).
Even if it slightly protrudes toward the reference end face 1a side due to i),
Since the manufacturing error (Δi) is absorbed by the facing gap Y and the reference end face 1a and the flange end face 5a do not come into contact with each other, the taper shank portion 4 is securely fitted into the taper hole 2. be able to. For example, in the JIS or ISO standard part number BT50 (IT50), the maximum diameter D is 69.850 mm and the length L is 100.8.
mm, the allowable facing gap Y between the reference end surface 1a of the spindle 1 and the flange end surface 5a of the tool holder 3 is 3 mm (ISO
The standard specifies 3.20 mm).

On the other hand, however, the reference end face 1a and the flange end face 5a are separated from each other with the facing gap Y interposed therebetween, and the cutting load is concentrated on the taper shank portion 4, so that the taper hole 2 and the taper shank portion are formed. 4 has an essential defect that the contact surface with 4 is easily worn due to the fretting corrosion phenomenon or the like.

Therefore, the spindle 1 and the tool holder 3 are subjected to precision machining so that the existing reference end face 1a of the spindle 1 is extended toward the flange end face 5a by the facing gap Y and is extended.
a '(FIG. 6), or the existing flange end surface 5a of the tool holder 3 is extended toward the reference end surface 1a by the facing gap Y to form the extended end surface 5a' (FIG. 7). It is conceivable that the reference end face 1a and the flange end face 5a are brought into close contact with each other at the same time when the parts 4 are brought into close contact with each other. According to the above configuration, the cutting load is between the extension end face 1a 'and the collar end face 5a, or the reference end face 1a.
And the extended end surface 5a 'are also received, the contact surface between the tapered hole 2 and the tapered shank portion 4 will not be worn due to the fretting corrosion phenomenon or the like.

However, the precision-processed spindle 1
Tool holder 3 of the normal standard described above and tool holder 3
If it is commonly used for the spindle 1 and the spindle 1, a problem arises because a manufacturing error (Δi) is allowed in the normal standard.

That is, as shown in FIG. 6, the length of the taper shank portion 4 is slightly shortened due to a manufacturing error (Δi) on the main shaft 1 which has been subjected to precision machining and has the extended end face 1a 'as shown by an imaginary line. Or a standard tool holder 3 in which the end surface 5a of the collar portion slightly protrudes toward the spindle due to a manufacturing error.
, The flange end surface 5a of the tool holder 3 comes into contact with the extension end surface 1a 'of the main shaft 1 before the taper shank portion 4 is closely fitted into the taper hole 2, so that the taper hole 2 and the taper shank portion 4 are A gap β is generated between the two, and the tool holder 3 cannot be securely attached to the spindle 1. Similarly,
As shown in FIG. 7, in the tool holder 3 having the flange end surface 5a 'which has been extended by precision processing, the length of the taper hole 2 may be slightly lengthened due to a manufacturing error (Δi) as shown by an imaginary line. Alternatively, if the standard end face 1a is attached to the standard spindle 1 that slightly protrudes toward the flange side due to manufacturing error, the tool holder may be attached to the reference end face 1a of the spindle 1 before the taper shank portion 4 is closely fitted. Since the extended end surface 5a 'of the contact portion 3 abuts, a gap β is formed between the tapered hole 2 and the tapered shank portion 4, and the tool holder 3 cannot be reliably attached to the spindle 1.

[0008]

SUMMARY OF THE INVENTION Therefore, according to the present invention, in the case where the existing reference end surface of the main shaft or the existing collar end surface of the tool holder is extended by the facing gap between them, the standard tool holder or Since it cannot be used as a main axis, it aims to solve this.

[0009]

The structure of the present invention for achieving the above object will be described with reference to the drawings attached to the embodiments of the present invention. In the present invention, the tapered hole 2 provided in the rotating or non-rotating main shaft 1 is used. , The taper shank portion 4 of the tool holder 3 having the tool gripping collar portion 5 is fitted, and an allowable facing gap is provided between the existing reference end surface 1a of the tip of the spindle 1 and the existing collar end surface 5a of the tool holder 3. In the tool holder mounting device having Y to mount the tool holder 3 on the spindle 1, the existing reference end surface 1a of the spindle 1 and the existing flange end surface 5a of the tool holder 3 facing the existing reference end surface 1a. And
The required protrusion amount α extends in the opposite direction to each other and extends the end face 1
b, 5b, and the tool holder 3 can be attached to the spindle 1 so that the two extended end faces 1b, 5b are anastomosed with each other.

[0010]

According to the above construction, as shown in FIGS. 1 and 2, the reference end surface 1a of the spindle 1 and the flange end surface 5a of the tool holder 3 are provided.
And the required protrusion amounts α1 and α2 to extend the extended end face 1b,
5b is formed so that the two extended end faces 1b, 5b are anastomosed with each other, so that the taper shank portion 4 of the tool holder 3 is closely fitted to the taper hole 2 of the main shaft 1 and at the same time the main shaft 1 The extended end surface 5b of the tool holder 3 can be brought into close contact with the extended end surface 1b. Therefore, the cutting load is also received by both the extending end faces 1b and 5b, and the tapered hole 2
The cutting load is not concentrated between the taper shank portion 4 and the taper shank portion 4, and the contact surface between the taper hole 2 and the taper shank portion 4 is not worn by the fretting corrosion phenomenon or the like.

Further, as shown in FIG. 3, the standard end face 1 of the normal standard is attached to the main shaft 1 on which the extended end face 1b is formed by precision processing.
The tool holder 3 having a is attached, or
Even when the tool holder 3 having the extended end face 5b similarly subjected to the precision processing as shown in FIG. 2 is attached to the main spindle 1 having the standard reference end face 1a, the extended end face 1 of the main spindle 1 is also attached.
b or the reference end face 1a and the flange end face 5a of the tool holder 3
Alternatively, a gap γ is formed between the extended end surface 5b and the gap γ
As a result, the manufacturing error allowed by the standard is absorbed, so that the taper shank portion 4 of the tool holder 3 can be fitted tightly and closely to the taper hole 2 of the spindle 1.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a tool holder mounting device according to an embodiment of the present invention, in which a taper hole 2 provided in a spindle 1 is shown.
A tool holder 3 in which a collar 5 for gripping a tool is integrally formed
As shown in FIG. 2, the taper shank portion 4 of the main shaft 1 is fitted, and the existing (normal standard) reference end face 1 of the main spindle 1 is attached.
a and the end surface 5a of the existing collar portion (normal standard) 5 of the tool holder 3 that faces the a, by the required protrusion amounts α1 and α2 in the mutually opposing direction (a half of the facing gap Y in the normal standard). 1), that is, 1.5 mm respectively, to form extended end faces 1b and 5b, and both extended end faces 1b and 5b are anastomosed with each other. It is preferable that the protrusion amounts α1 and α2 are the same, but it is not always necessary that the protrusion amount α1 on the main shaft side is 1 mm and the protrusion side α is 2 mm.

According to the above construction, the tapered shank portion 4 of the tool holder 3 is closely fitted to the tapered hole 2 of the main shaft 1, and at the same time, the extended end surface 5b of the tool holder 3 is closely fitted to the extended end face 1b of the main shaft 1. Because it is precision processed like
Both extension end faces 1b and 5b receive the cutting load, and the cutting load is not concentrated between the taper hole 2 and the taper shank portion 4, so that the taper hole 2 and the taper shank portion 4 are not formed. There is no risk that the contact surface with will be abraded by the fretting corrosion phenomenon.

Here, an example of concrete dimensions is JIS
In the standard part number BT50 (IT50 in ISO standard), the maximum diameter D of the tapered hole 2 and the tapered shank portion 4 is 6
9.850 mm, the length L of the tapered hole 2 is 100.8 m
m, the facing gap Y is 3 mm (ISO standard is 3.20 m
m), and the protrusion amounts α1 and α2 of both extension end faces 1b and 5b with respect to the existing reference end face 1a or the collar end face 5a are 1.5 mm or the protrusion amount of the main shaft side extension end face 1b. It is possible to set α1 to 1 mm and the protrusion amount α of the flange-side extended end surface 5b to 2 mm, or the opposite protrusion amount.

Next, a tool holder 3 having a flange end face 5a of a normal standard is attached to the main spindle 1 which has been subjected to the precision machining of the present invention and which extends a required protrusion amount α1 from the existing end face 1a to form an extended end face 1b. Similarly (Fig. 3), the tool holder 3 having the extended end face 5b formed by the precision machining of the present invention and extending the required protrusion amount α from the existing flange end face 5a has the spindle 1 having the standard reference end face 1a. 4 (FIG. 4) and, even if each is used, between the extended end face 1b or the reference end face 1a of the main shaft 1 and the collar end face 5a or the extended end face 5b of the tool holder 3, for example, the JIS standard designation. Number BT5
At 0, a gap γ of 1.5 mm is generated, and the gap γ absorbs a manufacturing error (Δi) of 0.4 mm that is normally allowed in the standard. Therefore, the taper shank portion 4 is firmly attached to the taper hole 2. Can be fitted.

[0016]

According to the present invention, the spindle and the tool holder need to be precisely machined, but since the extended end surfaces of the both can be anastomosed with each other, they can be attached, so that the spindle is tapered. The contact surface between the hole and the taper shank of the tool holder is not worn due to fretting corrosion phenomenon, etc., and the rigidity is extremely high, so heavy cutting can be easily performed, and moreover,
It can also be used for standard tool holders and spindles without losing compatibility.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the main part.

FIG. 3 is a vertical cross-sectional view showing a state in which a normal-standard tool holder is attached to the spindle of the present invention.

FIG. 4 is a vertical cross-sectional view of the tool holder of the present invention attached to a standard spindle.

FIG. 5 is a vertical sectional view of a conventional example.

FIG. 6 is a vertical sectional view showing a modification of the conventional example.

FIG. 7 is a vertical sectional view showing another modification of the conventional example.

[Explanation of symbols] 1 spindle 1a reference end surface 1b spindle extension end surface 2 taper hole 3 tool holder 4 taper shank portion 5 tool gripping collar portion 5a existing collar end surface 5b collar portion extension end surface Y facing gap α1 spindle extension Protrusion of end face α2 Extension of collar part Protrusion of end face

[Procedure amendment 3]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7] ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 23, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

According to the above configuration, as shown by the phantom line in the figure, the reference end face 1a slightly projects toward the flange end face 5a due to the manufacturing error (Δi), or the flange end face 5a due to the manufacturing error (Δi). Even if it slightly protrudes toward the reference end face 1a side, the manufacturing error (Δi) is absorbed by the facing gap Y, and the reference end face 1a and the flange end face 5a do not come into contact with each other. Taper shank part 4
Can be fitted tightly and securely. For example, JIS
Standard or ISO standard number BT50 (IT50)
Then, the maximum diameter D is 69.850 mm and the length L is 10 1 .
When it is 8 mm, the reference end face 1a of the spindle 1 and the tool holder 3
The permissible facing gap Y between the flange end surface 5a of the
In the O standard, it is defined as 3.20 mm).

[Procedure amendment 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0009

[Correction method] Change

[Correction content]

The structure of the present invention for achieving the above object will be described with reference to the drawings attached to the embodiments. According to the present invention, a taper hole 2 provided in a rotating or non-rotating main shaft 1 has a collar portion 5. The taper shank portion 4 of the tool holder 3 is fitted to the tool holder 3 and the existing reference end surface 1a at the tip of the spindle 1.
In the tool holder mounting device in which the tool holder 3 is mounted on the spindle 1 with an allowable facing gap Y between the existing flange end surface 5a and the existing reference end surface 1a of the spindle 1, The existing flange end surface 5a of the tool holder 3 facing this is formed into extended end surfaces 1b and 5b by extending a required protrusion amount α in a direction in which they face each other. The tool holder 3 can be attached to the main shaft 1 so that the parts 5b are anastomosed with each other.

[Procedure correction 4]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

Here, an example of specific dimensions is as follows:
S standard name number BT50 (ISO standard IT50)
Then, the maximum diameter D of the tapered hole 2 and the tapered shank portion 4 is 69.850 mm, and the length L of the tapered hole 2 is 10 1 . 8m
m, the facing gap Y is 3 mm (ISO standard is 3.20 m
m), and the protrusion amounts α1 and α2 of both extension end faces 1b and 5b with respect to the existing reference end face 1a or the collar end face 5a are 1.5 mm or the protrusion amount of the main shaft side extension end face 1b. It is possible to set α1 to 1 mm and the protrusion amount α of the flange-side extended end surface 5b to 2 mm, or the opposite protrusion amount.

Claims (1)

[Claims] 1. A tapered shank portion of a tool holder is fitted into a tapered hole provided in a rotating or non-rotating main spindle (hereinafter referred to as a main spindle), and an existing reference end surface of a tip of the main spindle and an existing flange end surface of a tool holder are connected to each other. In the tool holder mounting device in which the tool holder is mounted on the spindle by allowing an allowable gap between the two, the existing reference end surface of the spindle and the end surface of the existing collar portion of the tool holder facing the existing reference end surface. And a tool holder mounting device for mounting a tool holder on a main shaft such that both end surfaces are anastomosed with each other by extending a required amount of protrusion in opposite directions to each other. ..