KR100973396B1 - device for preventing spindle of machining center from cutting fluid - Google Patents

Abstract

The present invention relates to a cutting oil intrusion prevention device of a spindle of a machining center, which can increase the cutting oil intrusion blocking effect by double blocking the intrusion of cutting oil and allow air to be evenly injected to the outer circumferential surface of the spindle at equal pressure.

A spindle which is rotated by rotational power, a spindle bearing installed on the outer circumferential surface of the spindle, a head body surrounding the spindle with the spindle bearing therebetween, and a first air passage formed therein; A preload cover installed at a front end of the head body and having a second air passage communicating with the first air passage, a labyrinth installed at a lower end of the preload cover, and a front end of the preload cover and labyrinth; A first front cover having a third air passage communicating with the second air passage, and a second air passage provided at a front end of the first front cover and communicating with the third air passage; It includes a front cover.

Spindle, spindle bearing, head body, preload cover, labyrinth, front cover

Description

Device for preventing spindle of machining center from cutting fluid

TECHNICAL FIELD The present invention relates to the field of machine tools. More specifically, the machining center can increase the cutting oil penetration blocking effect by double blocking the cutting oil intrusion and allow the air to be evenly sprayed on the outer circumferential surface of the spindle at an even pressure. It relates to a cutting oil intrusion prevention device of the spindle.

Thanks to the trend of overall industry growth, automation and numerical control (NC) in the cutting field are also rapidly progressing. In recent years, multi-functional machining centers have emerged due to the complex combination of numerical control (NC) of machine tools, which has been divided into rotary lathe series and milling series, and the market has been supported by the wide demand of industrial sites. It is expanding rapidly. The above-mentioned machining center is an NC machine tool which automatically performs several kinds of cutting operations in one machine, and is usually equipped with an automatic tool change function and a function of automatically cutting and dividing two or more surfaces of a workpiece. The machining center can be divided into two types, the type of processing non-rotating parts and the type of rotating part, regardless of where the root of its development is located. Machining centers for non-rotating parts have been developed using the NC milling machine or NC drilling machine to be machined as a power generation matrix, including automatic tool changer (ATC), fouling magazine, The machining center was created by combining the Automatic Loader (AL). Machining centers for rotating parts use NC lathes as a power generation matrix and perform various processing such as angle division, grooving, hole processing, tapping, etc. after turning the rotating parts, and automatic workpiece exchange in addition to automatic tool changer It also has a device AL, and automates the removal of the workpiece by holding the material with the chuck prepared separately during processing and letting the finished workpiece out of the chuck.

The machining center processes a workpiece with a tool mounted on a rotating spindle by receiving a rotational force. In this case, the cutting oil is sprayed on the cutting part to protect the tool and increase the cutting force, and thus the front end of the spindle is exposed to the cutting oil.

Since the spindle bearings installed at the front end of the machining center are typically coated with lubricating oil (grease), when the cutting oil comes into contact with the lubricating oil, the lubricating oil melts and the spindle bearing cannot function properly. Accordingly, there is a need for a coolant intrusion prevention device capable of protecting the spindle bearing from the cutting fluid from entering between the spindle and the gap between the non-rotating portion surrounding the spindle.

Conventionally, as a cutting oil intrusion prevention device of a machining center spindle, a structure that prevents cutting oil from penetrating by injecting air into a gap with a non-rotating part around the front end of the spindle is used.

However, the cutting oil intrusion prevention apparatus of the conventional machining center spindle has a problem in that the cutting oil cannot be completely blocked because the air pressure is inadequate in the absence of the air outlet, allowing the penetration of the cutting oil as well as having a fine gap. .

In order to solve this problem, a technology is provided so that air is evenly sprayed around the gap between the spindles and at the same time, even if the power supply for the air supply is cut off, the gaps are protected to protect the spindle bearings from intrusion of cutting oil. It has been disclosed in "Preventing spindle oil coolant of machine tools" of Publication No. 10-2005-0066107 (published June 30, 2005).

However, the cutting oil intrusion prevention device of the conventional machining center spindle as disclosed in the publication No. 10-2005-0066107 is a problem that the cutting oil can be introduced when the lip made of rubber or synthetic resin wears due to long use There is this.

An object of the present invention is to solve the conventional problems as described above, it is possible to increase the cutting oil intrusion blocking effect by double blocking the intrusion of the cutting oil without using a lip, the air evenly pressure on the outer peripheral surface of the spindle It is to provide a cutting oil intrusion prevention device of the machining center spindle, which can be injected into.

As a means for achieving the above object, the configuration of the present invention, the spindle is rotated by applying the rotational power, the spindle bearing is provided on the outer peripheral surface of the spindle, and the spindle bearing between the spindle bearing A preload cover having a head body having a first air passage formed therein, a preload cover having a second air passage installed at a front end of the head body and communicating with the first air passage, A first front cover having a labyrinth installed, a third air passage installed at the front end of the preload cover and the labyrinth and communicating with the second air passage, and installed at a front end of the first front cover and the third And a second front cover having a fourth air passage communicating with the air passage.

In the constitution of the present invention, the labyrinth has a through-hole formed at the center thereof, and grooves are formed in a circle along the circumferential direction at the front and rear of the thickness surface, and a plurality of grooves are formed at the circumferential surface. It is preferable if it consists of.

In the constitution of the present invention, it is preferable that four wind grooves formed on the circumferential surface of the labyrinth be provided at intervals of 90 degrees.

The configuration of the present invention is preferably such that the fan groove formed on the circumferential surface of the labyrinth has a rectangular shape.

In the configuration of the present invention, the first front cover has a through hole formed at the center thereof, and an air passage is formed through the thick surface in the axial direction of the spindle. It is preferable that the flange portion is formed to extend, a plurality of air holes are formed circumferentially along the flange portion, and the end of the flange portion has a structure in which a protrusion is formed.

This invention can increase the cutting oil intrusion blocking effect by double blocking the intrusion of cutting oil, and has the effect that air can be sprayed evenly and evenly to the outer peripheral surface of a spindle.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings in order to describe in detail enough to enable those skilled in the art to easily carry out the present invention. . Other objects, features, and operational advantages, including the purpose, operation, and effect of the present invention will become more apparent from the description of the preferred embodiments.

For reference, the embodiments disclosed herein are only presented by selecting the most preferred embodiment in order to help those skilled in the art from the various possible examples, the technical spirit of the present invention is not necessarily limited or limited only by this embodiment Rather, various changes, additions, and changes are possible within the scope without departing from the spirit of the present invention, as well as other equivalent embodiments.

1 is a cross-sectional configuration diagram of a cutting oil intrusion prevention apparatus of a machining center spindle according to an embodiment of the present invention, Figures 2 to 4 are labyrinth of the cutting oil intrusion prevention apparatus of the machining center spindle according to an embodiment of the present invention, respectively Is a perspective view, front view, and side cross-sectional view, and FIG. 5 is a front sectional view of a first front cover of a cutting oil intrusion prevention apparatus of a machining center spindle according to an embodiment of the present invention.

As shown in Figures 1 to 5, the configuration of the cutting oil intrusion prevention apparatus of the machining center spindle according to an embodiment of the present invention, the spindle 5 and the spindle 5 that is rotated by applying the rotational power And the head body 1, which is provided on the outer circumferential surface thereof, surrounds the spindle 5 with the spindle bearing 6 interposed therebetween, and the first air passage 11 is formed. And a preload cover (2) formed at the front end of the head body (1) and having a second air passage (21) communicating with the first air passage (11), and of the preload cover (2). A third air passage 33 formed at the front end of the labyrinth 8 installed at the lower end of the front end and the preload cover 2 and the labyrinth 8 and communicating with the second air passage 21. 1 is installed in front of the front cover 3 and the first front cover 3, the fourth communication with the third air passage (33) Claim that a cylinder 41 is formed 2 comprises a front cover (4).

The labyrinth 8 is formed in a donut shape or a ring shape in which a through-hole 81 is formed in the center, and the grooves 83 and 84 are circularly formed along the circumferential direction of the ring at the front and rear sides of the thickness surface 82. Are each formed, and the circumferential surface 85 has four fan grooves 86 formed at 90 degree intervals. The number of the fan grooves 86 described above may be appropriately adjusted according to the size of the labyrinth 8 or the size of the fan grooves 86. In addition, the whirlwind groove 86 is formed in a square shape, and other shapes such as a triangle, a semicircle, and the like are possible.

The first front cover 3 has a pipe shape with a through hole 31 formed in the center thereof, and a third air passage 33 passes through the thickness surface 32 in the axial direction of the spindle 5. The flange portion 34 extends along the periphery of the through hole 31 in the axial direction of the spindle 5, and the air hole 36 circumferentially along the flange portion 34. ) Is formed in a plurality, the end of the flange portion 34 is made of a structure in which the protrusion 35 is formed. Eight air holes 36 are provided, and the number thereof may be appropriately adjusted according to the size of the first front cover 3 or the size of the air holes 36. In addition, the air hole 36 has a circular shape, and other shapes such as a square, a triangle, a semicircle, and the like are possible.

According to the above configuration, the action of the cutting oil intrusion prevention apparatus of the machining center spindle according to the embodiment of the present invention is as follows.

Air of a predetermined pressure generated from a pneumatic source (not shown) is transferred to the first air passage 11 of the head body 1 and the second air passage 21 and the first front cover 3 of the preload cover 2. The spindle 5 through an air hole 36 circumferentially formed of the first front cover 3 by passing through the third air passage 33 of the first air passage 41 and passing through the fourth air passage 41 of the second front cover 4. By exiting into the gap of the) to prevent the intrusion of cutting oil to protect the spindle bearing (6) to allow the spindle (5) to rotate smoothly.

The plurality of air holes 36 are formed circumferentially along the flange portion 34 so that the air can be evenly sprayed on the outer circumferential surface of the spindle 5 at equal pressure. In addition, the protrusion 35 formed at the end of the flange portion 34 serves to guide the air to be injected through the air hole 36.

Meanwhile, the labyrinth 8 provided between the lower part of the preload cover 2 and the lower part of the first front cover 3 is formed on the circumferential surface 85 of the labyrinth 8 while being rotated together with the spindle 5. The wind film is formed by using the fan groove 86, which is formed, to form an air film, thereby preventing the internal penetration of the cutting oil by the air film. Air for forming the air film using the fan groove 86 enters through the gap between the first front cover 3 and the preload cover 2, and the gap between the first front cover 3 and the spindle 5. By discharge through the secondary to prevent the intrusion of cutting oil.

1 is a cross-sectional view of a cutting oil intrusion prevention apparatus of a machining center spindle according to an embodiment of the present invention.

Figure 2 is a perspective view of the labyrinth of the cutting oil intrusion prevention apparatus of the machining center spindle in accordance with an embodiment of the present invention.

Figure 3 is a front view of the labyrinth of the cutting oil intrusion prevention apparatus of the machining center spindle in accordance with an embodiment of the present invention.

Figure 4 is a side cross-sectional view of the labyrinth of the cutting oil intrusion prevention apparatus of the machining center spindle in accordance with an embodiment of the present invention.

5 is a front sectional view of a first front cover of a cutting oil intrusion prevention apparatus of a machining center spindle according to an embodiment of the present invention.

Claims (5)

A spindle that is rotated by applying rotational power, A spindle bearing installed on the outer circumferential surface of the spindle, A head body surrounding the spindle with the spindle bearing therebetween and having a first air passage formed therein; A preload cover installed at the front end of the head body and having a second air passage communicating with the first air passage; Labyrinth is installed in the lower front end of the preload cover, A first front cover installed at a front end of the preload cover and the labyrinth and having a third air passage communicating with the second air passage; And a second front cover installed at a front end of the first front cover and having a fourth air passage communicating with the third air passage. The labyrinth is formed with a through-hole in the center, each of the grooves are formed in a circular shape along the circumferential direction in the front and rear of the thickness surface, characterized in that consisting of a structure in which a plurality of wind grooves are formed on the circumferential surface. Cutting oil intrusion prevention device of the machining center spindle. delete The method of claim 1, The coolant groove formed on the circumferential surface of the labyrinth is a coolant intrusion prevention device of the machining center spindle, characterized in that four are installed at intervals of 90 degrees. The method of claim 1, Coolant intrusion prevention device of the machining center spindle, characterized in that the galvanic groove of the labyrinth is made of a square. The method of claim 1, The first front cover has a through-hole formed in the center thereof, and an air passage is formed through the thick surface in the axial direction of the spindle, and the flange portion extends along the periphery of the through-hole in the axial direction of the spindle. And a plurality of air holes circumferentially formed along the flange portion, and the end of the flange portion has a structure in which a protrusion is formed.

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