JP2571325B2 - Tool holder mounting device - Google Patents

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 provided with a cutting tool on a rotating or non-rotating spindle of a machine tool such as a machining center having an automatic tool changer.

[0002]

2. Description of the Related Art As shown in FIG. 5, a tool holder 3 used for a manning center with an automatic tool changing device is provided with a manipulator gripping flange 5 for automatic tool change adjacent to a tapered shank portion 4 as shown in FIG. Is formed.
A tapered shank portion 4 of a tool holder 3 is fitted into a tapered hole 2 provided in a rotating or non-rotating spindle (hereinafter simply referred to as a spindle) 1 of a machine tool. According to JIS or ISO standards, In addition to standardizing the maximum diameter D, the axial length (reference dimension) L, and the like of the tapered hole 2 and the tapered shank portion 4, the reference end surface 1a of the main spindle 1 and the tool holder 3 are taken into account in view of a certain manufacturing error Δi. Providing a predetermined opposed gap Y between the flange 5 and the end face 5a is also standardized.

According to the above configuration, as shown by the imaginary line in the figure, the reference end face 1a slightly protrudes toward the flange end face 5a due to the production error Δi, or the flange end face 5a slightly projects due to the production error Δi. Even if it protrudes to the side 1a, the manufacturing error Δi is absorbed by the opposed gap Y, and the reference end face 1a and the flange end face 5a do not abut each other. The fitting can be surely performed. For example, JIS standard or ISO
According to the standard number BT50 (IT50), when the maximum diameter D is 69.850 mm and the length L is 101.8 mm, the opposing allowable gap between the reference end surface 1a of the main spindle 1 and the flange end surface 5a of the tool holder 3 is set. Y is 3 mm (3.2 in the ISO standard)
0 mm) and the manufacturing error Δi of the facing gap Y
Is defined as ± 0.4 mm.

However, since the reference end surface 1a and the flange end surface 5a are separated from each other with the opposed gap Y interposed therebetween and the cutting load is concentrated on the taper shank portion 4, the taper hole 2 and the taper shank portion 4 has an inherent disadvantage that the surface in close contact with 4 is easily worn due to fretting corrosion phenomenon or the like.

Therefore, the main spindle 1 and the tool holder 3 are subjected to precision machining, and the reference end face 1a of the main spindle 1 is extended toward the flange end face 5a by an opposing gap Y to form an extended end face 1a '(FIG. 6). ), The flange end face 5a of the tool holder 3 is extended toward the reference end face 1a by the facing gap Y and is extended to the extended end face 5a.
a ′ (FIG. 7), the tapered hole 2 and the tapered shank 4
And the reference end face 1a
And the flange end face 5a may be brought into close contact with each other. According to the above configuration, since the cutting load is received between the extension end face 1a 'and the flange end face 5a or between the reference end face 1a and the extension end face 5a', the close contact surface between the tapered hole 2 and the tapered shank portion 4 is formed. Is not worn due to fretting corrosion phenomenon or the like.

However, as described above, the allowable opposing gap Y between the tapered hole 2 of the main shaft 1 and the tapered shank portion 4 of the tool holder 3 fitted into the hole 2 is as described above.
A manufacturing error Δi of 0.4 mm is allowed,
For this reason, if only one of the end face 1a of the main spindle 1 or the end face 5a of the flange of the tool holder 3 is extended by precision machining to form the extended end face 1a 'or 5a', the above-described manufacturing error may occur. A problem arises because Δi is allowed.

That is, as shown in FIG. 6, a normal standard in which the main shaft 1 which has been subjected to precision processing and has an extended end surface 1a 'has a flange end surface 5a slightly projecting toward the main shaft due to a manufacturing error Δi as shown by a virtual line. When the tool holder 3 is mounted, the flange end face 5a of the tool holder 3 comes into contact with the extended end face 1a 'of the main spindle 1 before the tapered shank part 4 is tightly fitted into the tapered hole 2, so that the tapered hole 2 A gap β is generated between the shank 4 and the tool holder 3 and the tool holder 3 cannot be securely attached to the main shaft 1. Similarly, as shown in FIG. 7, the tool holder 3 having the flange end face 5a 'which has been subjected to precision machining and extended has a reference end face 1a slightly projecting toward the flange due to a manufacturing error Δi as shown by a virtual line. When the tapered shank portion 4 is fitted to the main shaft 1 of the normal standard, the extended end surface 5a 'of the tool holder 3 comes into contact with the reference end surface 1a of the main shaft 1 before the tapered shank portion 4 is tightly fitted to the tapered hole 2. A gap β is also formed between the shank 4 and the tool holder 3, so that the tool holder 3 cannot be securely attached to the main shaft 1.

[0008]

SUMMARY OF THE INVENTION Accordingly, the present invention does not provide a standard reference surface of a main spindle or a normal flange end surface of a tool holder which is extended by an opposing gap therebetween. An object of the present invention is to solve the problem because it cannot be used as a tool holder or a spindle.

[0009]

In order to achieve the above object, the present invention relates to a tool holder 3 having a flange 5 in a tapered hole 2 provided in a rotating or non-rotating spindle (hereinafter referred to as a spindle) 1. A tool holder mounting device in which a taper shank portion (4) is fitted to mount a tool holder (3) on a spindle (1). In a tool holder mounting device manufactured with a maximum diameter D and a permissible facing gap Y between a spindle side end surface 1a and a flange end surface 5a opposed thereto within a numerical range defined by an industrial standard, and the side end face 1a, respectively the flange end face 5a opposed thereto, industrial
Extend more than the allowable manufacturing error Δi specified in the standard
At the same time, the sum of both extension amounts α1 and α2 is
Within the range of the numerical value of the gap Y, they extend in opposite directions to each other and are formed on the extended end faces 1b and 5b, respectively.
A configuration is adopted in which the tool holder 3 can be attached to the main shaft 1 so that b and 5b anastomose each other.

[0010]

According to the present invention, as described above, the reference end surface 1a of the spindle 1 is provided.
And the normal flange end face 5a of the tool holder 3 are extended to extend the end faces 1b, 5b of the required extension amounts α1, α2.
The sum of the extension amounts α1 and α2 is within the range of the allowable facing gap Y, that is, smaller than the value, and the respective extension amounts α1 and α2
Must be larger than at least the manufacturing error Δi of the opposed gap Y, that is, the numerical value thereof.

By adopting the above configuration, as shown in FIGS. 1 and 2, both the reference end surface 1a of the main shaft 1 and the flange end surface 5a of the tool holder 3 are allowed to face each other.
The projections α1 and α2 are extended to form the extension end faces 1b and 5b within the range, and the extension end faces 1b and 5b are anastomosed to each other.
At the same time, the tapered shank portion 4 of the tool holder 3 can be closely fitted to the extension end surface 1b of the main shaft 1 and the extension end surface 5b of the tool holder 3 can be brought into close contact therewith. Therefore, the cutting load is also received by both of the extended end surfaces 1b and 5b, so that the cutting load is not concentrated between the tapered hole 2 and the tapered shank portion 4, and the tapered hole 2 and the tapered shank portion 4 are not applied. Is not worn due to fretting corrosion phenomenon or the like.

Further, a tool holder 3 having a flange end face 5a of a normal standard is attached to the main shaft 1 which has been subjected to precision processing to form an extended end face 1b as shown in FIG. 3, or as shown in FIG. Similarly, even when the tool holder 3 having the extended end face 5b formed by precision machining is attached to the main spindle 1 having the standard end face 1a of the normal standard, the extended end face 1
b or the extension amount α1 or α2 of the extension end surface 5b of the tool holder 3 is at least larger than the production error Δi of the opposed gap Y, that is, the numerical value thereof, so that the extension end surface 1b of the main shaft 1 or the reference end surface 1a. A gap γ is formed between the tool holder 3 and the flange end face 5a or the extended end face 5b of the tool holder 3, and the manufacturing error Δi normally allowed by the standard due to the gap γ.
Is absorbed, so that the tapered shank portion 4 of the tool holder 3 can be securely fitted into the tapered hole 2 of the main shaft 1 in close contact.

[0013]

FIG. 1 shows a tool holder mounting device according to an embodiment of the present invention.
And a tool holder 3 integrally formed with a flange portion 5 for gripping a tool.
As shown in FIG. 2, a standard standard of the spindle 1, for example, a standard end face 1a of Japanese Industrial Standard, and a standard standard of a tool holder 3 opposed thereto, for example, as shown in FIG. The end face 5a of the standard flange 5 is
Within the range of the allowable opposing gap Y of the normal standard, for example, the Japanese Industrial Standard, only the required protrusion amounts α1 and α2 in the opposing direction (1/2 of the opposing gap Y in the normal standard, that is, 1.5 mm each). The extended end faces 1b, 5b are formed by extension, and the extended end faces 1b, 5b are anastomosed to each other. It is preferable that the protrusion amounts α1 and α2 are the same, but it is not always necessary, and the protrusion amount α1 on the main shaft side is 1
mm, the flange side α may be 2 mm.

According to the above configuration, the tapered shank portion 4 of the tool holder 3 is tightly fitted into the tapered hole 2 of the main shaft 1, and the extended end surface 5b of the tool holder 3 is closely adhered to the extended end surface 1b of the main shaft 1. Because it is subjected to precision processing,
Since the cutting load is also received by the two extending end surfaces 1b and 5b, the cutting load does not concentrate between the tapered hole 2 and the tapered shank portion 4, so that the tapered hole 2 and the tapered shank portion 4 are not applied. There is no fear that the contact surface with the abrasion is worn due to fretting corrosion phenomenon or the like.

Here, an example of specific dimensions is shown in JIS.
In the standard 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, length L of tapered hole 2 is 101.8 m
m, opposing gap Y is 3 mm (3.20 m in the ISO standard)
m) (an error of ± 0.4 mm is recognized), and the standard end face 1a of this normal specification is used.
Alternatively, the protruding amounts α1 and α2 of the both extended end surfaces 1b and 5b with respect to the flange end surface 5a are each set to 1.5 mm, or the protruding amount α1 of the main shaft side extended end surface 1b is set to 1 mm. The protrusion amount α can be set to 2 mm or the reverse protrusion amount can be set.

Next, the main shaft 1 and the flange portion 5 are precision-machined, and as shown in FIG. 3, for example, as shown in FIG. If the tool holder 3 having the flange end face 5a of the normal standard is mounted, a maximum production error Δi of the opposing gap Y between both end faces 1b and 5a occurs 0.4 mm, and the opposing gap Y becomes 2.6 mm. , There is a gap of 2.6 mm-1 mm = 1.6 mm between the extended end face 1b and the flange end face 5a, and the gap end face is sufficiently usable. Also, as shown in FIG. 4, the required protrusion amount α from the flange end face 5a of the normal standard
2. A tool holder 3 having an extended end face 5b extended by 2 mm, for example, is mounted on a spindle 1 having a standard end face 1a.
In the case where the gap Y between the two end faces 5b and 1a is 2.6 mm as described above, the above-mentioned method is used.
There is a gap of 6 mm-2 mm = 0.6 mm, and it can be used sufficiently. That is, it can be used sufficiently within the range of the maximum manufacturing error Δi of the facing gap Y between the end face of the spindle and the end face of the flange of the tool holder.

As can be seen from the above description and as described in the section of the operation, in the above example, considering the manufacturing error Δi, the extended end face 1b on the main shaft 1 side and the tool holder 5
The extension amount of each of the side extension end surfaces 5b requires at least an extension amount of a maximum production error of 0.4 mm or more in the allowable facing gap Y between both end surfaces, and an extension amount less than that,
The aforementioned manufacturing error Δi cannot be absorbed.

Therefore, the required extension amounts α1, α
2 means that the above-mentioned manufacturing error Δi is naturally absorbed, and that the sum of the extending amounts α1 and α2 is within the range of the allowable facing gap Y.

[0019]

According to the present invention, it is troublesome that precision machining is required for the spindle and the tool holder. However, since the extended end faces of the spindle and the tool holder can be attached in an anastomotic state to each other, the taper of the spindle is required. Since the contact surface between the hole and the taper shank of the tool holder is not worn by fretting corrosion, etc., and has extremely high rigidity, heavy cutting can be easily performed.
It can be used for standard tool holders and spindles, and compatibility is not lost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention.

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

FIG. 3 is a longitudinal sectional view showing a state where a tool holder of a normal standard is attached to a spindle of the present invention.

FIG. 4 is a longitudinal sectional view showing a state in which the tool holder of the present invention is mounted on a normal standard spindle.

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

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main shaft 1a Reference end surface 1b Main shaft extension end surface 2 Tapered hole 3 Tool holder 4 Taper shank portion 5 Tool gripping flange portion 5a Normal standard flange end surface 5b Collar extension end surface Y Opposed gap α1 Projection amount of main shaft extension end surface α2 Protrusion of flange end face extension Δi Manufacturing error

Claims (1)

(57) [Claims] 1. A tool holder 3 having a flange portion 5 is fitted into a tapered hole 2 provided in a rotating or non-rotating spindle (hereinafter, referred to as a spindle) 1. A tool holder mounting device adapted to be mounted, comprising a tapered hole 2 of a main shaft 1 and a maximum diameter D of a tapered shank portion 4 of a tool holder 3 fitted into the main shaft 1, a main shaft side end surface 1a, and a flange end surface opposed thereto. In a tool holder mounting device in which a permissible facing gap Y between the main shaft 5a and the flange 5a is set within a range defined by an industrial standard, each of the main shaft side end surface 1a and the flange end surface 5a facing the main shaft side end surface 1a. The industrial
More than the allowable manufacturing error Δi specified in the standard
And the sum of both extension amounts α1 and α2 is
Within the range of the numerical value of the opposing gap Y , the tool is attached to the main shaft 1 so as to extend in the opposite direction to the extending end faces 1b and 5b, respectively, so that the extending end faces 1b and 5b are anastomosed to each other. A tool holder mounting device capable of mounting the holder 3.