KR20180000522U - High speed bearing center for protecting cutting oil and alien matters in CNC lathe - Google Patents

Abstract

The present invention relates to a cutting bearing for a CNC lathe and a high-speed bearing center for preventing foreign matter from penetrating, and more particularly, to a sealing cover 1 having a "C" And a second sealing cover (SEALING COVER 2), which is a form in which the cutting faces are coupled with the "C" shape, to prevent penetration of cutting oil and foreign matter, and a cutting oil for a CNC lathe and a high- will be.
The present invention relates to a live center including a tip for rotationally supporting a workpiece and having an outer circumferential surface coupled with a plurality of bearings; A first sealing cover coupled to the large diameter portion of the live center and having a cut-away "C"shape; A second sealing cover including a shape protruded to engage with the "D" A body for allowing the first sealing cover and the second sealing cover coupled to the live center to be inserted into the opening of the upper portion and to be coupled thereto; And an end cap mounted to the cap for blocking the hole at the rear end of the body.
Therefore, the present invention is precisely machined so that it can be blocked only by the coupling of the sealing cover, so that the lifetime is shorter than that of the conventional bearing, and the maintenance cost is prevented from increasing due to frequent replacement of oil seals.
Also, according to the present invention, since the live center and the first sealing cover rotate together, the cutting oil and the foreign material that can flow between the first and second sealing covers can be cut off in a " C "shape.
In addition, the present invention can prevent the occurrence of errors in the operation of the rotating body itself because cutting oil and foreign matter are naturally discharged to the discharge hole by centrifugal force or the like to damage the bearing.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a high-speed bearing center for protecting cutting oil and alien matters,

The present invention relates to a cutting bearing for a CNC lathe and a high-speed bearing center for preventing foreign matter from penetrating, and more particularly, to a sealing cover 1 having a "C" And a second sealing cover (SEALING COVER 2), which is a form in which the cutting faces are coupled with the "C" shape, to prevent penetration of cutting oil and foreign matter, and a cutting oil for a CNC lathe and a high- will be.

Generally, live center refers to a part of a machine tool that is attached to a tailstock of a lathe and rotatably supports the workpiece.

The live center of the prior art has a fixed body provided with a bearing mounting shaft of a small diameter soccer club at the front end of a main body having a large diameter shaft structure and a fixing member whose rear end is closely contacted with the outer peripheral surface of the front end portion of the main body in a state of being spaced apart from the outer peripheral surface of the bearing mounting shaft A rotating body having a space portion formed at a rear portion thereof so as to have a fine clearance and provided with a chuck portion at a front portion of the rotating body and a bearing mounting shaft of the fixing body and a space portion inner peripheral surface of the rotating body, And a bearing portion for rotating the bearing portion.

In the live center of the related art having such a configuration, the fixture body is fixedly mounted on the tailstock of the shelf, and the chuck portion of the rotation body rotates together with the workpiece while supporting the end portion of the workpiece.

However, such a live center of the related art does not have any sealing means for sealing the fine gap between the fixed body and the rotating body, so that cutting oil and foreign matter penetrate through the fine gap to damage the bearing, And an error occurs in operation of the rotating body itself.

In order to solve this problem, as shown in FIG. 7, a cover 21 'is provided to prevent a minute gap, and a ridener 22' is used at the cover. However, oil-seals wear or heat 100% cutting oil and foreign matter penetration can not be prevented due to the shrinkage phenomenon, and not only is it easily broken, but also the tool life is shortened and the maintenance cost is increased rapidly.

Korea registered utility model 0241737 Korean Registered Utility Model No. 0453482 U.S. Patent No. 4586718

The present invention has been conceived to solve the above-mentioned problems. The present invention has a double-cap structure using two covers such as a first sealing cover (SEALING COVER 1) and a second sealing cover (SEALING COVER 2) A cutting oil for a lathe, and a cutting fluid for a CNC lathe capable of cutting off a foreign substance in three steps by a bent (자-shaped) structure of a cutting surface, and a high-speed bearing center for preventing foreign matter from penetrating.

The present invention also prevents the cutting oil and foreign matter which enters the inside of the main body and damages the baying etc. by only the coupling of the first sealing cover (SEALING COVER 1) and the second sealing cover (SEALING COVER 2) And a discharge hole of the second sealing cover, and a high-speed bearing center for preventing penetration of a foreign material into the CNC lathe.

In order to solve the above problems, the present invention provides a live center in which a distal end portion for rotatably supporting a workpiece and an outer circumferential surface are coupled with a plurality of bearings; A first sealing cover coupled to the large diameter portion of the live center and having a cut-away "C" shape; A second sealing cover including a shape protruded to engage with the "D" A body for allowing the first sealing cover and the second sealing cover coupled to the live center to be inserted into the opening of the upper portion and to be coupled thereto; And an end cap mounted to the cap for blocking the hole at the rear end of the body.

The live center includes a front end portion for rotatably supporting the workpiece, a large diameter portion having a large diameter shaft structure and a lower side portion coupled to the body, a bearing having a double-head soccer bowl and combined with a double row angular ball bearing and a single thrust ball bearing A small diameter portion having a small diameter shaft structure, and an end cap portion on which the end cap is mounted.

The second sealing cover further includes a discharge hole formed through both sides of the second sealing cover so that the cutting oil and the foreign substance are discharged by the centrifugal force even if the cutting oil and the foreign substance pass through the second sealing cover to enter the body.

The portion corresponding to the portion D1 is the E2 portion of the second sealing cover in which the portion corresponding to the D1 portion is divided by D1, D2, and D3 from the portion where the cut surface of the first sealing cover starts, and the portion corresponding to the portion D2 When the cutting oil and the foreign matter come into the E4 portion of the second sealing cover where the portion corresponding to the D3 portion is blocked in three steps, .

Wherein the live center includes a washer which is engaged after the needle bearing and serves to prevent loosening of the double row angular ball bearing, the single throw thrust ball bearing, and the needle bearings; And an end cap coupled to the lowermost end of the body and sealing the internal space of the body with a cap to prevent foreign matter from penetrating.

The present invention, as described above, It is precisely machined so that it can be blocked only by the sealing cover. It has a shorter lifetime than conventional bearings and prevents the maintenance cost from increasing due to frequent replacement of oil-seals.

Also, according to the present invention, since the live center and the first sealing cover rotate together, the cutting oil and the foreign material that can flow between the first and second sealing covers can be cut off in a " C "shape.

In addition, the present invention can prevent the occurrence of errors in the operation of the rotating body itself because cutting oil and foreign matter are naturally discharged to the discharge hole by centrifugal force or the like to damage the bearing.

FIG. 1 is a view showing the overall front and side configurations and internal cut surfaces of a cutting fluid for a CNC lathe and a high-speed bearing center for preventing foreign matter penetration according to the present invention.
FIG. 2 is a side view exploded view of FIG. 1. FIG.
3 is a view showing a detailed configuration of a live center according to an embodiment of the present invention.
FIGS. 4A, 4B, and 4C are views showing a detail of a first sealing cover (SEALING COVER 1) and a second sealing cover (SEALING COVER 2) according to an embodiment of the present invention.
FIG. 5 is a view showing a detailed configuration according to an embodiment of the present invention.
FIG. 6 is an exploded view of FIG. 5. FIG.
Fig. 7 is a diagram showing the use of a lidana according to the prior art. Fig.

In order to fully understand the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the elements in the drawings can be exaggeratedly expressed to emphasize a clearer description. It should be noted that in the drawings, the same members are denoted by the same reference numerals. Further, the detailed description of the known functions and configurations that are considered to be unnecessarily blurring the gist of the present invention is omitted.

FIG. 1 is a view showing an overall front and side construction and an inner cut surface of a cutting oil and a high-speed bearing center for preventing penetration of a CNC lathe according to the present invention, FIG. 2 is a side view exploded view of FIG. 1, 1 is a view showing a detailed configuration of a live center according to one embodiment of the invention.

As shown in FIGS. 1 and 2, the present invention is applicable to a live center 10, which has a life span shorter than that of a conventional bearing, so that the maintenance cost can be prevented from increasing due to frequent replacement of oil seals. A SEALING COVER 1 21, a SEALING COVER 2 22 and a Double-row Angular Contact Ball Bearing 31, which are machined to a precision of 2/100 mm, A single-direction thrust ball bearing 32, a needle bearing 40, washers 2 and 50, a first sealing cover 21 coupled with the live center 10, A body 70 and an end cap 80 for inserting and joining the sealing cover 22 into the opening of the upper part.

3, the live center 10 includes a front end portion 11 for rotatably supporting a workpiece, and a front end portion 11 having a large diameter shaft structure and having a lower portion coupled with the body, A bearing portion 13 having a medium diameter soccer club and coupled to the double row angular ball bearing 31 and the single thrust ball bearing 32 and a small diameter portion 15 having a small diameter shaft structure, And an end cap portion 17 on which the end cap is mounted. At this time, tapered grinding portions 14 and 16 are formed between each bearing portion 13, the small diameter portion 15, and the end cap portion 17.

FIGS. 4A, 4B, and 4C are views showing a detail of a first sealing cover (SEALING COVER 1) and a second sealing cover (SEALING COVER 2) according to an embodiment of the present invention. FIG. 5 is a cross- FIG. 6 is an exploded view of FIG. 5. FIG.

The first sealing cover (SEALING COVER 1) 21 has a flat ring shape as shown in FIG. 4A. As shown in FIG. 4B, the rear surface of the sealing cover 21 has a two- It is shaped.

The first sealing cover 21 has a ring shape having a cylindrical space portion formed therein so as to tightly clamp the outer periphery of the cylindrical live center 10, The cutting oil and the foreign matter pass through the clearance between the cover and the sealing cover 22 to prevent the cutting oil and foreign matter from entering the inside of the body 70. As a result, the cutting oil and foreign matter penetrate into the inside through the fine clearance to damage the bearing, It is possible to prevent an error in its operation from occurring in advance.

The second sealing cover (sealing cover 2) 22 has a front surface portion formed as a tapered surface with an outer peripheral edge as shown in FIG. 4A, and a plurality of discharge holes 221 for discharging cutting oil and foreign substances along a tapered surface (E3 portion) at a position corresponding to the cutting face of the " C "-shaped shape in the inside, and is engaged while being pushed into the shape And is engaged with the body 70 by being formed with a step.

The second sealing cover 22 is ring-shaped and surrounds the outer circumference of the first sealing cover 21 to form a ring-shaped space having an inner cylindrical space so as to pass through the live center 10. The inside of the second sealing cover 22, The cutting oil and the foreign matter move smoothly into the discharge hole 221 formed through the opposite side surfaces of the second sealing cover 22 by the centrifugal force or the like along the tapered surface of the front surface portion It is possible to prevent the occurrence of errors in the operation of the rotating body itself.

The portion of the first sealing cover 21 corresponding to the portion D1 is divided into the portion E2 of the second sealing cover 22 and the portion of the first sealing cover 21 corresponding to the portion 1 is a place where the cutting oil and foreign matter enter the gap between the sealing cover 21 and the live center 10 in the first place.

The portion corresponding to the portion D2 of the first sealing cover 21 is a place where the cutting oil and foreign matter enter the E3 portion of the second sealing cover 22 to be secondarily blocked.

The portion corresponding to the portion D3 of the first sealing cover 21 is a thirdly blocked portion when the cutting oil and the foreign matter enter the portion E4 of the second sealing cover 22 and most of the cutting oil and the foreign matter are blocked Minute cutting oil and foreign substances which have entered into the body 70 can be smoothly discharged to the discharge hole 221 by centrifugal force or the like to completely prevent the damage of the bearings and the like.

Therefore, in the present invention, the live center and the first sealing cover rotate together to cut off the cutting oil and foreign matter that can flow between the first sealing cover and the second sealing cover in a " And the second sealing cover may be formed into a shape including a plurality of bending points other than "C ".

As shown in FIGS. 5 and 6, the double row angular ball bearing 31 is a bearing having a structure in which a straight line connecting the ball and the contact point between the outer ring and the inner ring forms a constant angle (contact angle) with the radial direction, Can withstand thrust loads. Further, the double row angular ball bearing 31 is applied as a wheel bearing, and has a characteristic of being resistant to lateral load.

The single thrust ball bearing 32 is a ball bearing used for receiving a thrust in one direction and for supporting a thrust acting in the direction of the rotational axis.

The needle bearing 40 is a bearing coupled to the first end of the live center 10, and is a line bearing that holds the center of rotation and supports each bearing.

The washer (2EA; 50, 60) is engaged after the needle bearing (40) to protect each bearing and to prevent loosening.

The end cap 80 is coupled to the lowermost end of the body 70 and seals the internal space of the body 70 with a cap to prevent foreign matter from penetrating.

The present invention having the above-described structure is a precision machining process that can be interrupted only by the engagement of the sealing covers 21 and 22, so that the lifetime is shorter than that of the conventional bearing, and the maintenance cost is increased due to frequent replacement of oil seals Respectively.

The present invention also relates to a method and apparatus for cutting off the cutting oil and foreign matter that can flow between the first sealing cover 21 and the second sealing cover 22 due to the rotation of the live center 10 and the first sealing cover 21 together, It can be cut off in shape.

Also, in the present invention, the cutting oil and foreign matter are naturally discharged into the discharge hole 221 by centrifugal force or the like to damage the bearing, thereby preventing the operation of the rotating body itself from occurring in advance.

10: Live Center
21: First sealing cover (SEALING COVER 1)
22: Second sealing cover (SEALING COVER)
31: Double-row Angular Contact Ball Bearing
32: Single-direction Thrust Ball Bearing
40: Needle bearing
50, 60: Washer
221: discharge hole

Claims (2)

A live center including a tip for rotationally supporting a workpiece, the outer periphery of which is coupled with a plurality of bearings;
A first sealing cover coupled to the large diameter portion of the live center and having a cut-away "C"shape;
A second sealing cover including a shape protruded to engage with the "D"
A body for allowing the first sealing cover and the second sealing cover coupled to the live center to be inserted into the opening of the upper portion and to be coupled thereto; And
And an end cap which is coupled to the lowermost end of the body and seals the internal space of the body with a cap to prevent infiltration of foreign matter,
The live center includes a front end portion for rotatably supporting the workpiece, a large diameter portion having a large diameter shaft structure and a lower side portion coupled to the body, a bearing having a double-head soccer bowl and combined with a double row angular ball bearing and a single thrust ball bearing A small diameter shaft portion with a small diameter shaft structure and an end cap portion on which the end cap is mounted and which is coupled after the needle bearing to protect the double row angular ball bearing, the single thrust ball bearing, and the needle bearing, A washer; A tapered grinding portion is formed between each bearing portion and the small diameter portion and between the small diameter portion and the end cap portion,
Wherein the second sealing cover has a front surface forming a tapered surface with an outer periphery, a plurality of discharge holes for discharging cutting oil and foreign matter along the tapered surface, a rear surface being flat and a step formed along the outer periphery And is engaged with the body,
The portion corresponding to the portion D1 is the E2 portion of the second sealing cover in which the portion corresponding to the D1 portion is divided by D1, D2, and D3 from the portion where the cut surface of the first sealing cover starts, and the portion corresponding to the portion D2 When the cutting oil and the foreign matter come into the E4 portion of the second sealing cover where the portion corresponding to the D3 portion is blocked in three steps, Cutting oil for CNC lathe and high-speed bearing center to prevent foreign matter penetration. The method according to claim 1,
The second sealing cover is ring-shaped and surrounds the outer circumference of the first sealing cover and tightly tightly surrounds the live center, and has a cylindrical space formed therein. When the cutting sealing oil and the foreign substance enter the body, So that cutting oil and foreign matter are naturally discharged to the discharge holes formed through both side surfaces of the second sealing cover by centrifugal force or the like along the tapered surface of the outer periphery of the part.

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