JPH0911078A - Holder installation surface cleaning device - Google Patents

Abstract

PURPOSE: To omit a cleaning device of the main shaft head side to simplify the structure of the main shaft head, and also to simultaneously clean the holder installation surfaces of the main shaft and a magazine so as to improve the tool fitting accuracy by jetting air from a tool holder gripped by a replacing arm to clean the holder installation surface when replacing the tool. CONSTITUTION: High-pressure air is supplied from an air supply pipe to an air passage 4b of a twin-type replacing arm 4, and when the replacing arm 4 grips a tool holder 6, a projection 9 projected from the tool gripping surface of the tip of the air passage 4b is air-tightly inserted into an air connecting port of the tool holder 6 to connect the air passage 4b of the replacing arm and the air passage of the tool holder to each other. At the time of replacing a tool, the main shaft and a taper hole of a magazine are simultaneously cleaned by the air jetted from an air nozzle 6g opened to the taper surface of the shank part 6A through air passage of 6d, 6e, 6f, into the taper hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cleaning a holder mounting surface of a machine tool with an automatic exchange mechanism for exchanging a holder having a tool or a work attached thereto by an exchange arm between the machine and a magazine.

[0002]

2. Description of the Related Art Conventionally, when a tool holder is attached to a spindle taper hole in which a tool holder of a machine tool such as a machining center is mounted, when the tool holder is attached while dust or the like is attached to the taper surface, the cutting edge is swung to deteriorate the machining accuracy. Therefore, it is common sense to clean every time the tool is changed.

This cleaning device, as shown in FIG.
An air passage 102a is axially formed in a draw bar 102 that is inserted in a center hole of 01 so as to be movable in the axial direction, and high-pressure air is ejected from a nozzle 102b at the tip of the air passage 102a when the tool holder 103 is replaced. Then spindle taper hole 101
I was cleaning a.

[0004]

In the cleaning device described in the prior art, it is necessary to form a thin and long air passage in the entire length of the draw bar 102, and this drilling process requires a very long time. Moreover, means for supplying air to this air flow path must be provided on the spindle head side, further complicating the structure of the already complicated spindle head. Also, when using a tool holder with a two-face restraint type shank that has recently been used, it is necessary to clean the tip surface of the spindle.
There is a problem that the structure of the spindle head becomes more and more complicated.

The holder mounting portion cleaning device of the present invention has been made in view of the above problems of the prior art, and its purpose is to eject air from the tool holder side held by the exchange arm. Therefore, it is an object of the present invention to provide a cleaning device capable of cleaning the taper hole of the spindle shaft and the taper hole of the magazine pot or the ready station pot at the same time.

[0006]

In order to achieve the above object, a holder mounting portion cleaning device according to the present invention is an automatic device for exchanging a holder to which a tool or a work is attached between the main body and a magazine by an exchange arm. A device for cleaning a holder mounting surface of a machine tool having a replacement function, comprising a joint projection that opens into a holder gripping surface of the replacement arm, and means for supplying high-pressure air to the projection at the time of replacement. The holder is provided with an air connection port for a joint into which the nozzle can be inserted and removed so that it can be inserted into and removed from the gripping surface of the replacement arm. Air is blown from the outlet to clean the holder mounting surface of this machine and magazine.

Further, the protrusion for the joint is provided on the projection for phase determination provided on the holder gripping surface of the exchange arm, and the air connection port for the joint is projected on the gripping surface of the tool holder by the exchange arm. It is provided in a concave portion provided so as to be engaged with the portion.

[0008]

When the NC replacement command is issued, the replacement arm pivots approximately 90 °, and the tool grippers on both sides grip both the machine side holder and the magazine side holder at the same time. At this time, the protrusion protruding from the tool gripping surface of the exchange arm is airtightly inserted into the air connection port of the holder, and the exchange arm and the air flow path of the holder are connected. High-pressure air is supplied to the air flow path in response to the tool gripping confirmation signal, and when the holder arm is inserted / removed due to movement of the replacement arm in the turning axis direction, air is ejected from the air ejection port that opens in the taper shank of the holder. Clean the magazine holder mounting surface.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a tip of a spindle head of a machining center, a tool holder during tool exchange, and an exchange arm.
[Fig. 6] is a top view of the tool holder and the end portion of the exchange arm. 1 and 2, a spindle 1 is a bearing housing 2 of a spindle head.
The main shaft 1 is rotatably supported by a plurality of bearings 3 therein, and the main shaft 1 is formed with a tapered hole 1a whose front end portion serves as a holder mounting surface.

The exchange arm 4 is a twin type having a tool gripping portion 5 at both ends, and the tool gripping portion 5 is a system of gripping a tool holder by turning the exchange arm 4. The tool holder 6 comprises a taper shank portion 6A, a flange portion 6B having a gripping groove 6a for an exchange arm, and a tool holding portion 6C, and a pull stud bolt 7 is concentrically screwed to an end portion of the taper shank portion 6A. .

The tool gripping portion 5 of the exchange arm 4 engages with a recessed portion (drive key groove) 6b formed in the flange portion 6B of the tool holder 6 to perform a phase matching projection 8 (piece).
Project from the tool gripping surface 5a. Further exchange arm 4
An air flow path 4b is bored from the rear surface 4a toward the bridge 8, and a protrusion 9 is attached to the tip of the air flow path 4b, and an air communicating with an air supply device (not shown) is connected to the rear end. Supply pipe 1
1 is attached.

On the other hand, the tool holder 6 has a drive key groove 6
An air passage 6d formed from the side wall 6C of b toward the axis is communicated with an air passage 6e formed in the axis, and a protrusion is provided at an air connection port 6h opened to the side wall 6c. 9 can be inserted and removed freely. . Further, the air flow passage 6e communicates with a plurality of radial air flow passages 6f that are open at a position closer to the central pull stud bolt 7 on the taper surface of the taper shank portion 6A. It is formed on the ejection port 6g.

Next, the operation of this embodiment will be described.
A tool change command is issued from the NC, and the change arm 4 is almost 90
Rotate by ° and simultaneously grip the tool holder 4 mounted in the taper hole 1a of the spindle 1 and the tool holder mounted in the taper hole of the magazine pot or the ready station pot (not shown). At this time, the gripping surface 5a of the exchange arm 6
The more protruding piece 8 is engaged with the drive key groove 6b, and at the same time, the tip of the protrusion 9 is inserted into the air connection port of the air flow path 6d to be airtightly connected.

In response to this tool gripping confirmation signal, an electromagnetic switching valve of an air supply device (not shown) is activated, and high-pressure air is supplied from the air supply pipe 11 to the air flow path 4b so that it can be ejected from the air ejection port 6g. Become.

Next, when the tool holder 6 is extracted by the movement of the exchange arm 4 in the direction of the swivel axis, a gap is formed between the spindle taper hole 1a and the taper shank portion 6A, and the air jet port 6g vigorously ejects the air to the outside. The tool holder is removed while the surrounding dust is blown away and cleaned. At this time, not only the spindle taper hole but also the taper hole of the magazine pot or the ready station pot is cleaned at the same time.

When the extraction is completed, the replacement arm 4 is moved to 180
° The positions of both tool holders 6 which are swung and gripped are exchanged with each other, and both tool holders 6 are simultaneously inserted into the spindle taper hole 1a and the taper hole of the magazine pot or the ready station pot by the movement of the exchange arm 4 in the turning axis direction. . At this time, when the air is ejected from the air ejection port 6g while the cleaning is performed while the insertion is performed and the gap between the taper shank portion 6A and the taper hole 1a becomes gradually smaller, the pressure of the air increases and the wind speed becomes faster. Blow dust that adheres to the outside.

When the tool holder 6 inserted into the spindle is gripped by the pull stud bolt 7 by the tool pulling device (not shown) and pulled up and clamped by the disc spring (not shown), the electromagnetic signal of the air supply device is sent by the confirmation signal of the tool clamp. The switching valve operates and the supply of air to the air supply port 11 is stopped.

The above is the MAS having a 7/24 taper.
Although the tool holder has been described, it can be applied to a two-face constraint tool holder that has recently been used, for example, in FIG. 1, the tapered surface and the flange end surface 6i contact the tapered hole 1a and the tip surface 1b. Of course, in this case, an air flow path for ejecting air from the flange portion end surface 6i of the tool holder toward the spindle tip surface 1b is added to simultaneously clean both the tapered hole and the flange portion end surface.

Further, although the present embodiment has described the machine tool having the automatic tool holder changing function, it is also applicable to the machine tool having the work holder automatic changing function in which the work is attached to the holder with the tapered shank. Of course.

[0020]

Since the present invention is configured as described above, the following effects can be obtained. The replacement arm and holder have an air flow path with a removable joint, and the holder mounting surface is cleaned with high-pressure air ejected from the taper shank of the holder during replacement, so the spindle head side is cleaned. There is no need to provide an air flow path for the spindle head, the structure of the spindle head is simplified, and the holder mounting surface on the magazine side as well as the machine side can be cleaned at the same time, so both holder mounting surfaces are always clean. By keeping it at, the dust that is difficult to clean with air will not stick to the holder, and the cleaning will be more complete and the tool mounting accuracy will be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a tip end portion of a spindle head of a machining center, a tool holder during tool exchange, and an exchange arm.

FIG. 2 is a top view of the tool holder and the end of the exchange arm.

FIG. 3 is a cross-sectional view of a spindle head tip portion of a conventional machining center.

[Explanation of symbols]

 1 Spindle 1a Spindle taper hole 4 Replacement arm 4b, 6d, 6e, 6f Air flow path 5 Tool gripping part 5a Tool gripping surface 6 Tool holder 6b Recessed part (drive key groove) 6g Air ejection port 6h Air connection port 8 Convex part (piece) ) 9 Pole 11 Air supply pipe

Claims (2)

[Claims] 1. A device for cleaning a holder mounting surface of a machine tool having an automatic exchange function for exchanging a holder on which a tool or a work is attached between the machine and a magazine by the exchange arm, wherein the exchange arm. Of a joint for opening a holder holding surface of the holder, means for supplying high-pressure air to the protrusion at the time of replacement, and a joint for the nozzle to be removably inserted into the holding surface by the replacement arm. It is composed of a holder that has an air connection port and an air ejection port at the mounting part to this machine or magazine, and when replacing, it ejects air from the air ejection port to clean the holder mounting surface of this machine and magazine Holder mounting surface cleaning device. 2. A projection for a joint is provided on a protrusion for phase determination provided on a holder gripping surface of an exchange arm, and an air connection port for a joint is provided on the gripping surface of a tool holder by the exchange arm. The holder mounting surface cleaning device according to claim 1, wherein the holder mounting surface cleaning device is provided in a recess provided so as to be engaged with the portion.