JP2002018662A - Polishing tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polishing tool mountable on a spindle of a machining center, exchangeable by an automatic tool exchanging device exactly similarly to the other tool, and used for finishing a machine surface of a work. SOLUTION: This tool is mounted on the spindle of a machining center and is used for finishing the machine surface of the work. A tool body comprises a tool shank 12 corresponding to tool exchanging by the automatic tool exchanging device and a polishing mechanism part for driving a polishing element 14, and the tool body has a built-in driving part 20 that is supplied with power from the spindle for driving the polishing mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing tool used for removing irregularities and cutter marks remaining on a machined surface as a finish after machining a mold or the like with a machine tool such as a machining center. In particular, the present invention relates to a polishing tool that can be stored in a tool magazine of a machining center and mounted on a spindle by an automatic tool changer.

[0002]

2. Description of the Related Art In a machining center, a tool such as a machining end mill can be automatically cut one after another by a multi-axis NC control while automatically cutting a curved surface or a groove having a complicated shape. be able to.

[0005] Immediately after the die is cut into a desired shape, slight irregularities and cutter marks always remain on the processed surface, but a finishing process for removing these is indispensable. Generally, in order to finally finish the processing surface of the mold, polishing must be performed. For example, the sealing surface of a mold needs to be polished carefully so that no irregularities or cutter marks remain.

[0004]

However, in the conventional mold manufacturing, the machining of grooves and curved surfaces can be performed automatically by a machining center. However, in the finishing process of the machined surface, a hand using a hand tool is used. Work or robot polishing is being performed. This is because the tool attached to the spindle of the machine tool in the machining center is exclusively a cutting tool, and there has been no tool suitable for polishing a mold that can be attached to the spindle of the machining center and used. For this reason, after the cutting work in the machining center is completed, it is necessary to change the setup again and perform the finishing work manually or by a robot, which not only takes time and labor but also allows the NC function of the machining center to be fully utilized. The problem was not pointed out.

[0005] Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, to be able to be mounted on a spindle of a machining center, and to have a tool changeable by an automatic tool changer just like other tools. An object of the present invention is to provide a polishing tool for finishing a machined surface of a workpiece.

[0006]

According to a first aspect of the present invention, there is provided a tool attached to a spindle of a machining center for finishing a work surface of a workpiece, the tool comprising an automatic tool changer. A tool shank corresponding to tool change and a polishing mechanism for driving a polishing element are provided in the tool main body, and a drive unit supplied with power from a main shaft and driving the polishing mechanism is built in the tool main body. It is characterized by the following.

According to the first aspect of the present invention, the cutting tool can be stored in the tool magazine of the machining center and mounted on the spindle by an automatic tool change command in exactly the same manner as other cutting tools. Subsequently, a series of steps from polishing to finishing of the processed surface can be automated.

According to a preferred embodiment of the present invention, the polishing mechanism preferably includes a belt grinding mechanism provided with an endless belt-shaped grinding belt circulating in the tool axis direction as a polishing element.

According to the third aspect of the present invention,
The belt grinding mechanism section includes a driving wheel rotated by the driving section, a contact wheel for pressing the grinding belt against the work surface of the work, and a coaxial arrangement with the tool body, supporting the contact wheel at the tip. And a support portion, wherein a grinding belt is wound around the driving wheel and the contact wheel.

According to a preferred embodiment of the present invention, the driving section can be constituted by an air motor to which air is supplied from an air supply path inside the main shaft via a tool shank.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a polishing tool according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a view showing one embodiment of a polishing tool according to the present invention. In this FIG.
Indicates the entire tool body. This tool body 10
The housing includes a housing section 11 having a built-in polishing mechanism, and a tool shank section 12 having specifications corresponding to tool change by an automatic tool changer in a machining center. In this embodiment, the polishing mechanism is configured as a belt grinding mechanism provided with an endless belt-shaped grinding belt 14, and the grinding belt 14 is pressed against the work surface of the workpiece by a contact wheel 15 disposed at the tool tip. The grinding surface can be polished while running the grinding belt 14 in the tool axis direction. In this embodiment, the tool shank portion 12 is a bottom grip taper shank, and the flange portion 1 serving as a grip portion gripped by a change arm of the automatic tool changer.
6, a taper shank 17 and a pull stud 18. The flange portion 16 is formed with a groove 19 with which the hook of the exchange arm is engaged.

Next, FIG. 2 is a view showing a belt grinding mechanism built in the housing 11 of the tool body 10. As shown in FIG. In FIG. 2, reference numeral 20 denotes a built-in air motor for driving a belt grinding mechanism. The air motor is supplied with air from a so-called through spindle type spindle of a machining center. Air supplied from the spindle is supplied to an air passage 2 penetrating through the tool shank portion 12.
1 to the air motor 20. Air motor 2
The drive wheel 22 is attached to the drive shaft 0, and the grinding belt 14 is wound around the drive wheel 22 and the contact wheel 15.

The contact wheel 15 is supported by a distal end of a support 24 extending coaxially with the tool axis, and protrudes from the distal end of the housing 11. This support 24
Consists of a tension arm 25 fixed to the housing 11 and a contact arm 26 slidably fitted to the tension arm 25. A coil spring 27 is housed inside the tension arm 25, and the elastic force of the coil spring 27
The contact arm 26 is urged in the axially extending direction, so that a predetermined tension is applied so that the grinding belt 14 does not slack, and when the grinding belt 14 comes into contact with the processing surface, the contact arm 26 contracts and cushions. It is designed to work.

Next, FIG. 3 is a view showing the inside of the spindle 30 to which the tool body 10 is attached. In FIG. 3, reference numeral 31 denotes a draw bar, and 32 denotes a collet. An air supply passage 32 extending in the axial direction is formed in the draw bar 31, and this air supply passage 32 is
Is connected to an air connection pipe 34 housed so as to be movable in the axial direction. The air connection pipe 34 is urged in the forward direction by the elastic force of the coil spring 36, and the distal end of the air connection pipe 34 is air-tightly pressed against the end face of the pull stud 18 at the end of the tool body 10. It has become. Therefore, by attaching the tool main body 10 to the main shaft 30, the air supplied from the air supply passage 32 is introduced into the air motor 20 from the air connection pipe 34 through the air passage 21 of the tool shank 12.

The polishing tool according to the present embodiment is configured as described above. Next, the operation thereof will be described.

According to this polishing tool, the tool body 1
0 is provided with a tool shank portion 12 having a specification corresponding to tool change by an automatic tool changer, so that the tool of the machining center is used together with other cutting tools in the same manner as a normal cutting tool used in a machining center. It can be stored in a magazine, and a tool change command can be given from an NC device to perform a tool change by an automatic tool changer.

Therefore, taking the machining of a mold as an example, after cutting the contour of the mold using a cutting tool, the tool is subsequently replaced with a polishing tool to finish the machining surface. By creating a machining program in the machining center, it is possible to polish the machined surface with the polishing tool of the present invention following the cutting of the contour shape, so that no irregularities or cutter marks remain on the machined surface. It can be completed automatically.

Here, FIG. 4 is a view showing an example of finish processing of the sealing surface of the mold. For example, the sealing surface 5 of the work W
In the case of polishing 0a, the main shaft 30 is positioned at a position where the grinding belt 15 is pressed against the sealing surface 50a so that the width direction and the processing direction are orthogonal to each other, and the main shaft 30 is moved in the direction of the arrow while the grinding belt 15 is running. By this (spindle 3
0 may be fixed and the workpiece W may be sent in the direction opposite to the arrow), and the surface of the sealing surface 50a can be efficiently and smoothly polished.

When the sealing surface 50b is polished, the main shaft normal direction of the machining center is controlled, and the grinding shaft 15 is pressed against the sealing surface 50b in the same manner by rotating the main shaft 90 degrees about the C axis. Its surface can be polished. As described above, using the advanced numerical control of the machining center, it is possible to control the feed movement of the belt-shaped grinding belt 15 along a complicated path by using a straight line, a circular arc, or a combination of these paths. Polishing can be automated on any surface.

In the above, the polishing tool according to the present invention has been described as an embodiment of a tool having a built-in belt grinding mechanism using an air motor as a drive source. For example, power is supplied from a spindle as a drive source. It is also possible to configure as a motor, and it is also possible to use a polishing mechanism of a type in which a grindstone or a grinding disk rotates instead of the belt grinding mechanism.

[0021]

As is apparent from the above description, according to the present invention, a mold which can be mounted on a spindle of a machining center and which can be tool-changed by an automatic tool-changer in exactly the same manner as other tools. And a polishing tool for finishing the machined surface.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a polishing tool according to the present invention.

FIG. 2 is a partially cutaway sectional view of the polishing tool according to the embodiment.

FIG. 3 is a cross-sectional view showing an air supply path of a spindle for supplying air to a polishing tool.

FIG. 4 is a view showing an example of use of a polishing tool.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Tool main body 11 Housing part 12 Tool shank part 14 Grinding belt 15 Contact wheel 16 Flange part 17 Taper shank 18 Pull stud 20 Air motor 21 Air passage 22 Driving wheel 24 Support part 25 Tension arm 26 Contact arm

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hidehiro Yamamoto 2068-3 Ooka, Numazu-shi, Shizuoka Toshiba Machine Co., Ltd. F-term (reference) 3C002 AA00 KK07 LL01 3C016 AA02 FA33 3C058 AA05 AA14 CB08

Claims (4)

[Claims] 1. A tool mounted on a spindle of a machining center for finishing a work surface of a work, comprising: a tool shank corresponding to tool change by an automatic tool changer;
A polishing mechanism for driving a polishing element is provided in the tool main body, and a driving unit supplied with power from a main shaft and driving the polishing mechanism is incorporated in the tool main body. . 2. The polishing mechanism as a polishing element,
2. A belt grinding mechanism comprising an endless belt-shaped grinding belt circulating in a tool axis direction.
A polishing tool as described in. 3. The belt grinding mechanism includes a driving wheel rotated by the driving unit, a contact wheel for pressing a grinding belt against a work surface of a workpiece, and a tool body supporting the contact wheel at a tip end. The polishing tool according to claim 2, further comprising a support portion arranged coaxially, wherein a grinding belt is wound around the driving wheel and the contact wheel. 4. The polishing tool according to claim 3, wherein the driving unit comprises an air motor to which air is supplied from an air supply path inside the main shaft via a tool shank.