KR101148181B1 - Instrument holder mounting system - Google Patents

Abstract

A tool holder mounting system according to the present invention comprises a spacer 30 in the form of a thin ring interposed between a collar portion 22 of a spindle 20 and a flange portion 16 of a tool holder 10 mounted thereon, And fixing means for detachably fixing the spacer to the collar portion of the spindle.
The fixing means comprises a block 321 in the form of a hexahedron and a drive wing 32 detachably coupled to the collar portion of the spindle, the press wing 322 formed around the block portion, A key groove 22a into which the block portion of the drive key is inserted is formed.
The block portion of the drive key has a structure in which a bolt hole 32a is formed to penetrate the drive key. The drive key is bound to the spindle by a key bolt 34 screwed to the spindle through the bolt hole of the block portion.
According to the present invention, there is an advantage in that the stability of the machining operation is improved because the coupling strength between the spindle and the tool holder is improved due to the interposition of spacers that cancel the allowable gap between the collar portion of the spindle and the flange portion of the tool holder .

Description

Technical Field [0001] The present invention relates to a tool holder mounting system,

The present invention relates to a tool holder mounting system for mounting a tool holder supporting a cutting tool to a machine tool.

Generally, a machine tool used for cutting is configured to selectively use a cutting tool such as a chuck according to the processing method of the workpiece to be processed and the surface roughness of the workpiece or the workpiece, and the selective use of such a cutting tool A tool holder for detachably securing a cutting tool is used.

1, the tool holder 10 includes a holder portion 12 for holding a cutting tool, a shank portion 14 coupled to the spindle 20 of the machine tool, a holder portion 12 and a shank portion 14 And a flange portion 16 formed between the flange portion 16 and the flange portion 16.

The shank portion 14 of the tool holder 10 has a tapered shape with an outer diameter reduced toward the tip end and a flange portion 16 is provided with a drive projection 22 projecting from the collar portion 22 at the tip of the spindle 20, The mounting groove 20a of the spindle 20 into which the shank portion 14 is inserted is also formed in a tapered shape to be fitted with the shank portion 14. [

The drive projection 221 of the spindle 20 is inserted into the fitting groove 16a of the spindle 20 in a state where the tool holder 10 is coupled to the spindle 20, And effectively transmit the information to the holder 10.

The tool holder 10 thus configured is detachably mounted to the spindle 20 of the cutting tool which has a mounting structure of a conventional tool holder 10 in which a tapered shank 14 is mounted on the mounting groove of the spindle 20 20a and a draw member 24 in the spindle 20 and a pull-stud 18 at the tip of the shank portion 14 are engaged so that the tool holder 10 is inserted into the mounting groove 20a so that the outer surface of the shank portion 14 and the inner surface of the mounting groove 20a are brought into close contact with each other so that the shank portion 14 is engaged with the mounting groove 20a.

According to the JIS standard or the ISO standard, when the tool holder 10 is mounted on the spindle 20, the collar portion 22 of the spindle 20 and the tool holder 10 opposed to the collar portion 22, A predetermined allowable clearance D is defined between the flange portions 16 of the flange portion 16, and some problems caused thereby will be described as follows.

First of all, according to each standard, the allowable clearance is formed between the collar portion 22 of the spindle 20 and the corresponding flange portion 16, as described above, in the mounting groove 20a of the spindle 20, The shank portion 14 of the holder 10 is formed.

That is, assuming that the allowable gap D is not formed and the collar portion 22 of the spindle 20 and the flange portion 16 are in close contact with each other, when the tool holder 10 is mounted, When the shank portion 14 is pulled inwardly of the mounting groove 20a by the engagement of the full stud 18, the collar portion 22 and the flange portion 16 as well as the outer surface of the shank portion 14 and the mounting grooves 20a ) Should also be in close contact with each other.

However, since a minute machining error is generated in the manufacturing process of the spindle 20 or the tool holder 10, the diameter and the taper of the shank portion 14 can be precisely adjusted with respect to the diameter and taper of the spindle mounting groove 20a The collar portion 22 of the spindle 20 and the flange portion 16 of the tool holder 10 are in close contact with each other while the outer surface of the shank portion 14 and the flange portion 16 of the mounting groove 20a are in close contact with each other. An error gap is formed on the inner surface, so that the shank portion 14 is not firmly fixed to the spindle 20. [

In the incomplete seating state of the tool holder 10, vibrations may occur during operation due to the operating characteristics of the spindle 20 and the tool holder 10 rotating at high speed. As a result, a precise machining operation can be performed A clearance is formed between the collar portion 22 of the spindle 20 and the flange portion 16 of the tool holder 10 in order to prevent such a problem.

According to the prior art, therefore, a machining error occurring in the manufacturing process of the tool holder 10 is limited by the allowable gap D between the collar portion 22 of the spindle 20 and the flange portion 16 of the tool holder 10, The manufacturing cost of the tool holder 10 is not increased compared to the case of applying a very strict manufacturing precision to the extent that machining error does not occur because the tool holder 10 is normally mounted.

However, according to this conventional technique, when the tool holder 10 is mounted on the spindle 20 and rotates at a high speed higher than a fixed value, the mounting groove 20a of the spindle 20 is expanded by the centrifugal force When the mounting groove is expanded and the allowance gap D is formed between the collar portion 22 of the spindle 20 and the flange portion 16 of the tool holder 10, Is retained only by the member 24 and the full stud 18.

Therefore, a so-called cutting load generated at the time of work concentrates only on the full stud 18, and consequently the support force against the tool holder 10 is weakened. Therefore, There arises a problem that stability and precision are lowered.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a tool holder which is interposed between a collar portion of a spindle and a flange portion of a tool holder, And to provide a mounting system.

A tool holder mounting system according to the present invention comprises a spacer in the form of a thin ring interposed between a collar portion of a spindle and a flange portion of a tool holder mounted on the spindle and a spacer ring detachably fixed to the collar portion of the spindle And fixing means.

Wherein the fixing means comprises a hex key and a drive wing detachably coupled to the collar of the spindle, the drive key comprising a compression wing formed around the block, A key groove into which the block portion of the key is inserted is formed.

The block portion of the drive key has a bolt hole passing through the inside thereof. The drive key is coupled to the spindle by a key bolt threaded through the bolt hole of the block portion and screwed to the spindle.

The spacer is formed in the same plane as the end face of the collar portion of the spindle and has a key slot to prevent interference with the block portion of the drive key inserted into the key groove.

The tool holder mounting system according to the present invention is characterized in that the spindle has a structure in which a plurality of threaded holes are formed in a front end surface of a collar portion and the spacer has a plurality of through holes corresponding to the threaded holes formed therein And the fixing means may include a plurality of engaging screws which pass through the through holes of the spacer and engage with the threaded holes of the spindle collar portion to press and fix the spacer.

According to the tool holder mounting system of the present invention as described above, since the joint between the collar of the spindle and the flange of the tool holder intervenes between the spindle and the tool holder, And the processing accuracy is improved.

1 is a cross-sectional view of a tool holder mounting system according to the prior art;
2 is an exploded perspective view showing a configuration of a tool holder mounting system according to the present invention.
3 is an assembled perspective view illustrating a configuration of a tool holder mounting system according to the present invention.
4 is an exploded perspective view showing a configuration of a tool holder mounting system according to another embodiment of the present invention.
5 is an assembled perspective view showing a configuration of a tool holder mounting system according to another embodiment of the present invention.

Hereinafter, specific details of the present invention will be described in detail with reference to FIGS. 2 to 5. The same elements as those of the conventional art are denoted by the same reference numerals, and a description thereof will be omitted.

The tool holder mounting system according to the present invention is characterized in that it is provided between the collar portion 22 of the spindle 20 and the flange portion 16 of the tool holder 10 mounted on the spindle 20, And a fixing means for releasably fixing the spacer 30 to the collar portion 22 of the spindle 20. The spacer 30 has a thin ring-shaped spacer 30 interposed therebetween.

The spacer 30 is formed in the same plane shape as the end surface of the collar portion 22 of the spindle 20. The spacer 30 has a block portion 321 of the drive key 32, A key slot 30a is provided so as not to interfere.

The thickness of the spacer 30 is set to a value that allows the tool holder 10 to be formed between the collar portion 22 of the spindle 20 and the flange portion 16 of the tool holder 10 in a state where the tool holder 10 is mounted on the spindle 20. [ Is the same as or slightly smaller than the clearance D (see FIG. 1).

The fixing means includes a hex key 321 and a drive wing 322 formed around the block 321 and includes a drive key 32 detachably coupled to the spindle 20 .

A key groove 22a for inserting a block portion 321 of the drive key 32 is formed in the collar portion 22 of the spindle 20 and the drive key 32 is formed such that one end of the block portion 321 The pressing wing portion 322 presses one end of the spacer 30 toward the collar portion 22 in a state where the pressing wing portion 322 is engaged with the spindle 20 by being inserted into the key groove 22a of the collar portion 22, Whereby the spacer 30 is fixed.

The block 321 of the drive key 32 has a bolt hole 32a penetrating the bolt hole 32a of the block 321. The bolt hole 32a is formed in the block 321 of the drive key 32, And is fastened to the spindle 20 by a key bolt 34 screwed to the spindle 20. As shown in Fig.

In the meantime, the tool holder mounting system according to the present invention further includes a plurality of engagement screws 36, which are coupled to the spindle 20 through the spacer 30 'as shown in FIG. 4, .

A plurality of screw holes 22b are formed in the end surface of the collar portion 22 of the spindle 20 and the screw holes 22b are formed in the spacer 30 ' And the engaging screw 36 passes through the through hole 30b of the spacer 30 'and passes through the threaded hole 30b of the collar portion 22 of the spindle 20, (22b), thereby pressing and fixing the spacer (30 ').

The operation of the tool holder mounting system according to the present invention will now be described.

3, when the spacer 30 is mounted on the spindle 20, when the drive key 32 is separated from the spindle 20, the spacer 30 is inserted into the collar portion 32 of the spindle 20, The drive key 32 is inserted into the key groove of the collar portion 22 and the key bolt 34 is passed through the block portion 321 of the drive key 32 so that the key bolt 34 contacts the end face of the spindle 22, (Not shown).

The spacer 30 is disposed so that the key slot 30a corresponds to the key groove 22a and the drive key 32 is inserted into the key groove 22a through the key slot 30a, The pressing wing portion 322 of the spacer 32 presses the spacer 30, and thereby the spacer 30 is fixed.

After the spacer 30 is mounted, the tool holder 10 is coupled with the spindle 20. The coupling structure of the tool holder 10 and the spindle 20 is the same as in the prior art, The front end surface of the flange portion 16 is brought into close contact with the spacer 30 on the opposite side of the collar portion 22 of the spindle 20. [

One end of the block portion 321 of the drive key 32 is inserted into the fitting groove 16a of the flange portion 16 of the tool holder 10 while the tool holder 10 is mounted on the spindle 20 The drive key 32 not only fixes the spacer 30 but also transmits the rotational force of the spindle 20 to the tool holder 10 like the conventional drive projection 221 It also plays a role.

5, the spacer 30 'is fixed to the spindle 20 using the drive key 32, and then the spacer 30' is fixed to the spacer 30 ' Through the through holes 30b of the spindle 20 and the coupling screws 36 are mounted on the spindle 20.

The engaging screw 36 is fixed to the collar portion 22 of the spindle 20 through the spacer 30 'so that the fixed state of the spacer 30' is further strengthened.

In the present invention, the spacers 30 and 30 'have various planar shapes according to the shapes of the spindle 20 and the tool holder 10, Structure and the like can be made variously.

According to the present invention, the spacers 30 and 30 ', which cancel the allowable clearance, are interposed between the collar portion 22 of the spindle 20 and the flange portion 16 of the tool holder 10, And the tool holder 10 are improved, the stability of the operation using the tool holder 10 is improved.

10: tool holder 12: holder part
14: shank portion 16: flange portion
20: spindle 22: collar portion
22a: key groove 22b: screw hole
30: spacer 30a: key slot
30b: through hole 32: drive key
321: Block unit 322:
34: key bolt 36: engaging screw

Claims (5)

1. A tool holder mounting system in which a constant clearance is maintained between a collar of a spindle tip of a machine tool and a flange of a tool holder mounted on the spindle, the tool holder mounting system comprising:

A thin ring-shaped spacer interposed between the collar of the spindle and a flange of a tool holder mounted on the spindle; and fixing means detachably fixing the spacer to the collar of the spindle,

The fixing means
And a drive key detachably coupled to the collar portion of the spindle, the drive key comprising a block portion having a hexahedron shape and a pushing blade portion formed around the block portion,
Wherein a key groove is formed in a collar portion of the spindle to insert a block portion of the drive key,

Wherein the pressing wing portion urges one end of the spacer toward the collar portion in a state where the block portion of the drive key is inserted into the keyway of the collar portion so that the spacer is fixed and at the same time the tool holder is coupled to the spindle, Being inserted into the fitting groove of the flange portion
The tool holder mounting system comprising:
delete The method according to claim 1,
Wherein the block portion of the drive key has a structure in which a bolt hole penetrating the inside is formed,
The drive key is coupled to the spindle by a key bolt threaded through the bolt hole of the block part and screwed onto the spindle
The tool holder mounting system comprising:
The method according to claim 1,
The spacer
The planar shape is the same as that of the collar portion of the spindle,
And a key slot for preventing interference with the block portion of the drive key inserted into the key groove
The tool holder mounting system comprising:
5. The method of claim 4,
Wherein the spindle has a structure in which a plurality of threaded holes are formed on a distal end surface of a collar portion,
Wherein the spacer has a structure in which a plurality of through holes corresponding to the screw holes are formed,
The fixing means includes a plurality of coupling screws for pressing and fixing the spacer by being coupled to the threaded hole of the spindle collar portion through the through hole of the spacer,
The tool holder mounting system comprising:

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