KR20170050489A - Apparatus for preventing oil inflow in machine tool - Google Patents

Apparatus for preventing oil inflow in machine tool Download PDF

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Publication number
KR20170050489A
KR20170050489A KR1020150152086A KR20150152086A KR20170050489A KR 20170050489 A KR20170050489 A KR 20170050489A KR 1020150152086 A KR1020150152086 A KR 1020150152086A KR 20150152086 A KR20150152086 A KR 20150152086A KR 20170050489 A KR20170050489 A KR 20170050489A
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KR
South Korea
Prior art keywords
housing
main shaft
air
circumferential groove
machine tool
Prior art date
Application number
KR1020150152086A
Other languages
Korean (ko)
Inventor
홍상표
Original Assignee
현대위아 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 현대위아 주식회사 filed Critical 현대위아 주식회사
Priority to KR1020150152086A priority Critical patent/KR20170050489A/en
Publication of KR20170050489A publication Critical patent/KR20170050489A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/02—Driving main working members
    • B23Q5/04—Driving main working members rotary shafts, e.g. working-spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/02—Driving main working members
    • B23Q5/04—Driving main working members rotary shafts, e.g. working-spindles
    • B23Q5/043—Accessories for spindle drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/54—Arrangements or details not restricted to group B23Q5/02 or group B23Q5/22 respectively, e.g. control handles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/762—Sealings of ball or roller bearings by means of a fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/80—Labyrinth sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2322/00—Apparatus used in shaping articles

Abstract

The present invention relates to a structure for preventing inflow of dust and cutting oil efficiently into a machine tool having a large diameter, and more particularly to a structure for preventing inflow of dust and cutting oil into a machine tool, A bearing which is disposed between the housing and the main shaft and rotatably supports the main shaft; an air flow path formed through the housing; and an air flow path connected to the air flow path, And a first circumferential groove formed along a direction of the first circumferential groove.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a structure for preventing inflow of cutting oil to a machine tool, and more particularly, to a structure for preventing inflow of dust and cutting oil efficiently in a machine tool having a large diameter.

A machining center is a numerically controlled machine tool that automatically performs a variety of cutting operations on a single machine. It usually has automatic tool change function and the ability to automatically machining and dividing more than two faces of a workpiece. These machining centers include an automatic tool changer, a tool magazine, and an automatic loader.

In such a machine tool, a tool is mounted on a spindle that rotates under a rotational force, and the workpiece is machined (cut, etc.) by a rotating tool. At this time, cutting oil is supplied to the cutting portion in order to protect the tool and increase the cutting force, so that the front end of the main shaft is exposed to the cutting oil.

On the other hand, lubricating oil (grease) is generally applied to the main shaft bearing mounted between the main shaft of the machine tool and the housing to induce smooth rotation of the main shaft. When the cutting oil introduced from the outside comes into contact with the lubricating oil, The function can not be performed.

For this reason, there is a need for a structure for protecting the main shaft bearing by preventing the cutting oil or foreign matter from flowing into a gap between the main shaft and the housing surrounding the main shaft.

FIG. 1 is a cross-sectional view for explaining a conventional coolant inflow preventing structure. FIG. 1 is a perspective view schematically showing a housing 10 as a non-rotating member, a main shaft 20 rotated by a driving unit in the housing 10, 10 of a plurality of spindle bearings 30. As shown in FIG.

A minute gap is formed between the housing 10 as the non-rotating member and the main shaft 20, and the foreign matter flows into the gap (arrow a). The cutting oil supplied to the cutting portion of the workpiece during machining flows (arrow b) through the gap existing between the outer peripheral surface of the tip end portion of the main shaft 20 and the inner peripheral surface of the housing 10. The introduced cutting oil and foreign matter flow into the main shaft bearing 30 disposed between the housing 10 and the main shaft 20.

Accordingly, air purge and air curtain structures can be formed to protect the main shaft bearing 30. [

An air passage 12 connected to a purge air tank (not shown) provided outside is formed in the housing 10 and the end of the air passage 12 corresponds to the leading end of the main shaft 20. The purge air supplied from the purge air tank flows through the air flow path 12 and then is injected at a predetermined pressure through the end of the air flow path 12. [

The purge air injected at a predetermined pressure is injected between the housing 10 and the main shaft 20 and then discharged to the outside of the housing 10 (arrow c). Therefore, foreign matter and cutting oil introduced into the gap between the inner circumferential surface of the housing 10 and the outer circumferential surface of the main shaft 20 are discharged to the outside together with the discharged purge air, thereby blocking the inflow of the cutting fluid into the main shaft bearing 30.

A part of the purge air injected between the housing 10 and the main shaft 20 moves to the circumferential surface of the main shaft 20 and the air curtain is formed by the shape of the circumferential surface of the main shaft 20 .

Fig. 2 is an enlarged view of a portion A in Fig. 1, showing the tip end 21 of the main shaft 20. Fig. 2, one or more grooves 22, 23 are formed on the outer circumferential surface of the leading end 21 of the main shaft so as to be spaced apart from each other. Each of the grooves 22, And is formed in a circular shape on the outer peripheral surface.

When the purge air is injected into the main shaft 20 having such a structure, the purge air flows along the grooves 22 and 23 and consequently the entire width of the grooves 22 and 23 on the circumferential surface of the leading end 21 of the main shaft An air curtain having a width corresponding to that of the air curtain is formed. Therefore, the cutting oil and foreign matter introduced from the outside can not move to the main shaft bearing (30) by the air curtain.

However, if the purge air is injected in the form of a groove or a hole as described above, the air is not uniformly discharged all over the main shaft and a section is not discharged.

Accordingly, there is a possibility that dust and cutting oil may flow into the section where air is not discharged, and the inflow dust and cutting oil stick to each other to block the air outlet, thereby drastically lowering the efficiency of the air purge.

In addition, in the conventional art, the discharge port through which the air is injected is concentrated at a specific portion, and thus the discharge of air is not uniform in the radial direction including the circumference, and the main shaft of the machining center having a small diameter may be effective. There is a problem in that efficiency is deteriorated in a main shaft having a large diameter.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a structure for preventing inflow of dust and cutting oil efficiently into a machine tool having a large diameter.

According to an aspect of the present invention, the above and other objects can be accomplished by the provision of the present invention as defined in claim 1, including: a housing having a cavity; a labyrinth housing fixed to a distal end of the housing; a main shaft rotatably mounted on the hollow of the housing; And an air flow path formed through the housing and a first circumferential groove connected to the air flow path and formed in a circumferential direction at a front end of the housing, do.

The apparatus further includes a second circumferential groove formed along the circumferential direction of the labyrinth housing opposite to the first circumferential groove.

And the width of the second circumferential groove is wider than the width of the first circumferential groove.

In addition, the air conditioner further includes a stepped line formed on the outer circumferential surface of the front end portion of the housing in the same line as the point where the air flow path is formed.

Since the structure for preventing the inflow of cutting oil to the machine tool according to the present invention includes the circumferential groove, since the purge air can be discharged in all directions in the circumferential direction of the housing without any rectangular section, dust and cutting oil do not flow during machining, The efficiency of the air purge can be increased.

Also, by including the step, it is possible to prevent that the supply section of the line-shaped purge air, which is the same as the point where the air flow path is formed, is prevented from moving due to the strong air flow and the air is not discharged.

1 is a sectional view for explaining a conventional coolant inflow preventing structure.
2 is an enlarged view of a portion A in Fig.
3 is a cross-sectional view illustrating a structure for preventing inflow of a cutting oil into a machine tool according to an embodiment of the present invention.
4 is an enlarged view of a portion B in Fig.

Hereinafter, a preferred embodiment of the cutting oil inflow preventing structure of the machine tool of the present invention will be described with reference to FIGS. 3 to 4.

It is to be understood that both the foregoing description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention, and are not intended to limit the scope of the invention. But are merely illustrative of the elements recited in the claims.

FIG. 3 is a cross-sectional view illustrating a structure for preventing inflow of cutting oil to a machine tool according to an embodiment of the present invention, and FIG. 4 is an enlarged view of a portion B in FIG.

First, referring to FIG. 3, a description will be made of a structure for preventing inflow of coolant into the machine tool according to an embodiment of the present invention. The housing 100, the labyrinth housing 110, the main shaft 200, and the bearing 300 are not greatly different from the structure of a general machine tool in the structure for preventing the inflow of cutting oil to the machine tool of the present invention.

The housing 100 has a hollow cylindrical shape, and a labyrinth housing 110 is fixed to the distal end of the housing 100. The labyrinth housing 110 is generally fixed using bolts. The labyrinth housing 110 also has a hollow cylindrical shape, but has a smaller overall diameter than the housing 100. The housing and the labyrinth housing are non-rotating members.

A main shaft 200 is mounted in the hollow of the housing 100 and the main shaft 200 is mounted through the hollow of the labyrinth housing 110. The main shaft 200 has a cylindrical shape and is rotatable by a driving unit. A plurality of bearings 300 are disposed between the main shaft 200 and the housing 100 to rotatably support the main shaft.

The housing 100 is formed with an air passage 120 connected to an external air tank (not shown). The air passage 120 includes an air inlet 122 through which air flows from an external air tank and an air outlet 124 through which the air is discharged to the outside of the housing. The air outlet 124 corresponds to the front end of the housing 100. The purge air supplied from the air tank flows through the air passage 120 and then is injected at a predetermined pressure through the air outlet 124 of the air passage.

Next, the structure for preventing inflow of cutting oil to the machine tool of the present invention will be described in detail with reference to Fig. 4, centering on the circumferential groove 140 and the step 160. Fig.

The circumferential groove 140 may include a first circumferential groove 142 connected to the air channel 120 and formed at a distal end of the housing 100 in a circumferential direction, And a second circumferential groove 144 formed along the circumferential direction of the labyrinth housing 110 opposite to the second circumferential groove 144. The first circumferential groove 142 and the second circumferential groove 144 are formed in a circular shape along the circumferential direction. Only the first circumferential groove 142 may be formed but it is effective to include the second circumferential groove 144 so that the pressure of the purge air can be well formed because the space for forming the pressure is insufficient. The cross-section of the circumferential groove 140 may be any shape such as a quadrangle, a circle, and an ellipse. In this embodiment, the cross-section has a rectangular cross-section.

The width of the second circumferential groove 144 is preferably larger than the width of the first circumferential groove 142. The purge air supplied to the air flow path 120 is discharged to the outside of the housing 100 through the first circumferential groove 142 and the second circumferential groove 144, If the width is larger than the width of the first circumferential groove 142, the discharge to the outside of the housing effectively occurs after the pressure is formed. Specifically, the first circumferential grooves 142 and the second circumferential grooves 144 are located on the same position as the radially inwardly positioned grooves closer to the main shaft 200, and the second circumferential grooves 144 The radially outwardly located groove wall is located farther from the center of the main shaft 200 than the radially outwardly located groove wall of the first circumferential groove 142, To be sprayed to the outside.

Purge air injected from the air outlet 124 of the air passage forms a pressure along the circumferential groove 140. The circumferential groove 140 is formed in a circular shape along the circumferential direction of the housing 100 and the labyrinth housing 110 so that pressure is uniformly generated in the omnidirectional direction of the housing to enable uniform discharge of air.

However, in the section where the purge air is directly supplied from the air discharge port 124, that is, in the same line as the point where the air flow path 120 is formed on the outer peripheral surface of the front end portion of the housing 100, So that the movement is disturbed and the discharge of air does not occur.

Accordingly, a step 160 formed on the outer circumferential surface of the front end of the housing 100 is formed on the same line as the point where the air flow path 120 is formed. Specifically, a step 160 is formed at a point where the purge air is directly discharged from the air discharge port 124 of the air flow path 120 through the circumferential groove 140, and a point 160 at which the second circumferential groove 144 ends And the like. Or may be formed in a circular shape over the entire outer circumferential surface of the front end portion of the housing 100. Therefore, the strong flow air generated in the above-mentioned portion passes through the step 160 and the pressure is lowered so that the air can be stably discharged.

As described above, foreign substances and cutting oil present on the outside are prevented from flowing into the housing by the purge air uniformly sprayed all over the housing at a predetermined pressure. Accordingly, since dust and cutting oil do not flow during machining and the air discharge port is not blocked, the efficiency of air purge can be increased.

100: housing 110: labyrinth housing
120: air passage 122: air inlet
124: air outlet 140: circumferential groove
142: first circumferential groove 144: second circumferential groove
160: Step 200:
300: Bearing

Claims (4)

A housing having a hollow;
A labyrinth housing fixed to a distal end of the housing;
A main shaft rotatably mounted in the hollow of the housing;
A bearing disposed between the housing and the main shaft for rotatably supporting the main shaft;
An air passage formed through the housing; And
A first circumferential groove connected to the air flow path and formed along a circumferential direction at a front end of the housing;
Wherein the cutter is provided with a cutter. The method according to claim 1,
A second circumferential groove formed along a circumferential direction of the labyrinth housing opposite to the first circumferential groove;
Wherein the cutter is provided with a cutter. 3. The method of claim 2,
And the width of the second circumferential groove is wider than the width of the first circumferential groove. The method of claim 3,
A step formed on the same line as the point where the air flow path is formed on the outer peripheral surface of the front end portion of the housing;
Further comprising: a cutting-oil inflow prevention structure of the machine tool.
KR1020150152086A 2015-10-30 2015-10-30 Apparatus for preventing oil inflow in machine tool KR20170050489A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150152086A KR20170050489A (en) 2015-10-30 2015-10-30 Apparatus for preventing oil inflow in machine tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150152086A KR20170050489A (en) 2015-10-30 2015-10-30 Apparatus for preventing oil inflow in machine tool

Publications (1)

Publication Number Publication Date
KR20170050489A true KR20170050489A (en) 2017-05-11

Family

ID=58741403

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150152086A KR20170050489A (en) 2015-10-30 2015-10-30 Apparatus for preventing oil inflow in machine tool

Country Status (1)

Country Link
KR (1) KR20170050489A (en)

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