KR20160068175A - Spindle unit of a machining center - Google Patents

Abstract

A spindle unit of a machining center can include a housing, a spindle, a collet, a holder, a first air line and a second air line. The spindle can be rotationally combined with the inner circumference of the housing. The collet can be combined with the inner circumference of the spindle while being movable in the axial direction of the spindle. The holder can clamp a tool by being detachably combined with the collet. The first air line can inject first air between the holder and the spindle, while being formed in the spindle. The second air line can inject second air to a front end of the holder clamping the tool. The first air line and the second air line can be separated. Therefore, the holder can be combined with the spindle accurately, since foreign substances like a coolant and a cutting oil can not flow into the second air line.

Description

[0001] SPINDLE UNIT OF A MACHINING CENTER [0002]

The present invention relates to a spindle unit of a machining center, and more particularly to a spindle unit of a machining center for machining a workpiece by rotating the tool.

Generally, a machine tool can be divided into a turning center and a machining center. The turning center can be machined using a tool. On the other hand, a machining center can machine materials using a rotating tool.

The machining center may include a spindle unit. The spindle unit may include a spindle for rotating the tool, a collet coupled to the spindle, and a holder detachably coupled to the collet to clamp the tool. The spindle unit may also include a first air line and a second air line. The first air line can spray the first air between the holder and the spindle when the tool is replaced to prevent foreign substances such as coolant, cutting oil, etc. from penetrating into the collet. The second air line can form an air curtain in front of the holder by spraying the second air in front of the holder.

According to the related art, the first air line and the second air line can be connected to each other. When the holder is separated from the collet for tool replacement, the first and second air lines have a pressure lower than the atmospheric pressure, so that coolant, cutting oil, etc. can flow into the collet through the first and second air lines . Such a foreign substance may cause misalignment of the holder with respect to the spindle, which may cause defective machining of the workpiece. Further, when the holder clamped with the new tool is coupled to the collet, the coolant, cutting oil, etc. already introduced may be introduced into the bearing supporting the rotation of the spindle. Foreign matter introduced into the bearing may wear the bearing.

The present invention provides a spindle unit of a machining center capable of preventing the penetration of foreign matter.

The spindle unit of the machining center according to one aspect of the present invention may include a housing, a spindle, a collet, a holder, a first air line, and a second air line. The spindle may be rotatably coupled to the inner circumferential surface of the housing. The collet may be movably coupled to the inner circumferential surface of the spindle along the axial direction of the spindle. The holder is detachably coupled to the collet to clamp the tool. The first air line may be formed in the spindle and may inject the first air between the holder and the spindle. And the second air line may jet the second air to the front end of the holder for clamping the tool. The first air line may be separate from the second air line.

In exemplary embodiments, the spindle unit of the machining center may include a bearing disposed between the housing and the spindle, a retainer coupled to a side of the housing to support the bearing, and a cover coupled to a side of the retainer .

In exemplary embodiments, the second air line may extend from the housing to the cover through the interior of the retainer. The cover may have at least one spray hole communicating with the second air line to spray the second air.

In exemplary embodiments, the injection holes may be arranged radially in the cover.

A spindle unit of a machining center according to another aspect of the present invention may include a housing, a spindle, a collet, a holder, a main air line, a first sub air line, and a second sub air line. The spindle may be rotatably coupled to the inner circumferential surface of the housing. The collet may be movably coupled to the inner circumferential surface of the spindle along the axial direction of the spindle. The holder is detachably coupled to the collet to clamp the tool. The main air line may be formed inside the housing. The first sub air line extends through the interior of the spindle from the main air line and can inject the first air between the holder and the spindle. The second sub air line may extend from the main air line through the spindle separately from the first sub air line and may inject the second air to the front end of the holder for clamping the tool.

In exemplary embodiments, the spindle unit of the machining center may include a bearing disposed between the housing and the spindle, a retainer coupled to a side of the housing to support the bearing, and a cover coupled to a side of the retainer .

In exemplary embodiments, the first sub-air line may extend from the main air line to a position adjacent the rear end of the holder through the interior of the retainer, the cover and the spindle.

In exemplary embodiments, the second sub-air line may extend from the main air line through the retainer, and between the cover and the spindle.

According to the present invention, since the first air line, the second air line, the first sub air line and the second sub air line are separated from each other, foreign matter such as coolant, cutting oil, It can not enter the airline. Thus, the holder can be accurately engaged with the spindle, so that the tool can precisely process the workpiece according to the designed specifications.

1 is a cross-sectional view of a spindle unit of a machining center according to an embodiment of the present invention.
2 is a perspective view showing a spindle unit of the machining center shown in Fig.
3 is a cross-sectional view of a first sub-air line of a spindle unit of a machining center according to another embodiment of the present invention.
4 is a cross-sectional view of the second subairline of the spindle unit of the machining center shown in Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a part or a combination thereof is described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

FIG. 1 is a cross-sectional view of a spindle unit of a machining center according to an embodiment of the present invention, and FIG. 2 is a perspective view of a spindle unit of the machining center shown in FIG.

1 and 2, a spindle unit of a machining center according to the present embodiment includes a housing 110, a spindle 120, a collet 130, a holder 140, a retainer 150, a cover 160, A first air line 170 and a second air line 180.

The spindle 120 may be rotatably coupled to the inner circumferential surface of the housing 110. Specifically, a bearing 115 may be interposed between the spindle 120 and the housing 110. Accordingly, the spindle 120 can be rotatably connected to the inner circumferential surface of the housing 110 via the bearing 115. [ The spindle 120 can transmit power to rotate the tool for machining the workpiece. The spindle 120 may have a shaft hole formed along the axial direction of the spindle 120.

The collet 130 may be movably disposed within the shaft hole of the spindle 120. The collet 130 may be movably coupled to the inner circumferential surface of the spindle 120 along the axial direction of the spindle 120. In this embodiment, the collet 130 may be splined to the inner circumferential surface of the spindle 120. Thus, the collet 130 can be rotationally moved along the inner circumferential surface of the spindle 120.

The holder 140 may be detachably coupled to the collet 130. The holder 140 can clamp the tool. That is, the holder 140 may have a rear end detachably coupled to the collet 130, and a front end for clamping the tool. The holder 140 may have a tapered outer circumferential surface which is in close contact with the inner circumferential surface of the tapered portion of the spindle 120.

The retainer 150 is coupled to the outer surface of the housing 110 to support the bearing 115. Here, the outer surface of the housing 110 may correspond to the side surface of the holder 140 facing the front end. The cover 160 may be coupled to the outer surface of the retainer 150. [

The first air line 170 can jet the first air between the tapered outer circumferential surface of the holder 140 and the tapered inner circumferential surface of the spindle 120. During tool change, the holder 140 may be disengaged from the collet 130 and moved downward from the shaft opening of the spindle 120. Therefore, a space may be formed between the tapered outer circumferential surface of the holder 140 and the tapered inner circumferential surface of the spindle 120. The first air supplied through the first air line 170 is guided to the gap between the tapered inner circumferential surface of the holder 140 and the tapered outer circumferential surface of the spindle 120 to prevent foreign substances such as coolant and cutting oil from penetrating through the space. Space.

In this embodiment, the first air line 170 may be formed along the interior of the spindle 120. In particular, the first air line 170 may be provided separately from the second air line 180. That is, the first air line 170 may be a separate line separate from the second air line 180. therefore. The first air line 170 may have an air supply source separate from the air supply source of the second air line 180. The first air line 170 may be connected to a separate blast device to receive the first air.

The second air line 180 may spray the second air toward the front end of the holder 140 to form an air curtain in a space where the front end of the holder 140 is located. The air curtain can prevent foreign substances such as coolant, cutting oil, and the like from flowing into the shaft hole of the spindle 120. As described above, the second air line 180 may be connected to an air source separate from the blasting device for the first air line 170.

In this embodiment, the second air line 180 may extend from the housing 110 to the cover 160 through the interior of the retainer 150. In particular, the second air line 180 located within the retainer 150 may be separated from the first air line 170 by the blocking block 190.

Since the first air line 170 and the second air line 180 are completely separated from each other by the blocking block 190 as described above, foreign matter such as coolant, cutting oil, Can be prevented from being introduced into the second air line 180 through the first air line 170.

Since the second air line 180 has a complicated structure formed in a stepped shape in the housing 110, the retainer 150 and the cover 160, even when the spindle 120 is not rotating, The inflow of air into the air line 180 can be suppressed.

The cover 160 may have at least one spray hole 182 communicating with the second air line 180 to spray the second air. The spray holes 182 may be arranged radially in the cover 160. The spray holes 182 arranged in a radial pattern can inject the second air toward the axial direction of the spindle 120.

According to the present embodiment, since the first air line 170 and the second air line 180 are completely separated by the blocking block 190, foreign substances such as coolant, cutting oil and the like are supplied to the second air line 180 Can not be introduced. Further, since the first air line 170 has a complicated step structure, foreign matter can be prevented from flowing into the first air line 170.

3 is a sectional view showing a first sub air line of a spindle unit of a machining center according to another embodiment of the present invention and FIG. 4 is a sectional view showing a second sub air line of a spindle unit of the machining center shown in FIG. 3 .

3 and 4, the spindle unit of the machining center according to the present embodiment includes a housing 210, a spindle 220, a collet 230, a holder 240, a retainer 250, a cover 260, The main air line 290, the first sub air line 270, and the second sub air line 280. [

The spindle 220 may be rotatably coupled to the inner circumferential surface of the housing 210 via a bearing 215. [ The collet 230 may be movably coupled to the inner circumferential surface of the spindle 220 along the axial direction of the spindle 220. The holder 240 may have a rear end detachably coupled to the collet 230, and a front end for clamping the tool. The holder 240 may have a tapered outer circumferential surface that is in close contact with the inner circumferential surface of the tapered portion of the spindle 220. The retainer 250 is coupled to the outer surface of the housing 210 to support the bearing 215. The cover 260 can be coupled to the outer surface of the retainer 250.

The main air line 290 may be formed inside the housing 210. In this embodiment, the main air line 290 may be connected to one air source.

Referring to FIG. 3, the first sub air line 270 may be connected to the main air line 290. The first sub air line 270 extends from the main air line 290 to a position adjacent to the rear end of the holder 240 through the interior of the retainer 250, the interior of the cover 260 and the interior of the spindle 220 . The first sub air line 270 can spray the first air between the tapered outer circumferential surface of the holder 240 and the tapered inner circumferential surface of the spindle 220 to prevent foreign substances such as coolant and cutting oil from penetrating.

Referring to FIG. 4, the second sub air line 280 may be connected to the main air line 290. That is, the second sub air line 280 may be a separate line from the first sub air line 270. Accordingly, the first sub air line 270 and the second sub air line 280 may be branched from the main air line 290. The second sub air line 280 extends from the main air line 290 through the space between the interior of the retainer 250, the interior of the cover 260 and the outer peripheral surface of the spindle 220 and the inner peripheral surface of the cover 260. [ (Not shown). The second air line 280 may spray the second air toward the front end of the holder 240 to form an air curtain in a space where the front end of the holder 240 is located.

According to the present embodiment, since the first sub air line 270 and the second sub air line 280, which are separately extended from one main air line 290, are separated, foreign matter such as coolant, cutting oil, Can not flow into the second air line 280 through the sub air line 270.

As described above, according to the present embodiments, since the first air line and the second air line, the first sub air line and the second sub air line are separated from each other, foreign substances such as coolant, cutting oil, Or the second subairline. Thus, the holder can be accurately engaged with the spindle, so that the tool can precisely process the workpiece according to the designed specifications.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. And changes may be made without departing from the spirit and scope of the invention.

110, 210; Housings 120, 220; Spindle
130, 230; Collets 140, 240; holder
150, 250; Retainers 160 and 260; cover
170; A first air line 182; Spray gun
180; A second air line 190; Blocking block
270; A first sub air line 280; The second sub-
290; Main Airline

Claims (7)

housing;
A spindle rotatably coupled to an inner circumferential surface of the housing;
A collet movably coupled to an inner circumferential surface of the spindle along an axial direction of the spindle;
A holder detachably coupled to the collet for clamping the tool;
A first air line formed inside the spindle for spraying a first air between the holder and the spindle; And
And a second air line separated from the first air line, and a second air line, which is separated from the first air line, by injecting second air to the front end of the holder for clamping the tool. The method according to claim 1,
A bearing disposed between the housing and the spindle;
A retainer coupled to a side surface of the housing to support the bearing; And
And a cover coupled to a side surface of the retainer. 3. The air cleaner according to claim 2, wherein the second air line extends from the housing to the cover through the interior of the retainer, and the cover includes at least one spray hole communicating with the second air line, The spindle unit of the machining center. housing;
A spindle rotatably coupled to an inner circumferential surface of the housing;
A collet movably coupled to an inner circumferential surface of the spindle along an axial direction of the spindle;
A holder detachably coupled to the collet for clamping the tool;
A main air line formed inside the housing;
A first sub air line extending from the main air line through the interior of the spindle and injecting a first air between the holder and the spindle; And
And a second sub air line extending from the main air line through the spindle separately from the first sub air line and for spraying second air to the front end of the holder for clamping the tool, . 5. The method of claim 4,
A bearing disposed between the housing and the spindle;
A retainer coupled to a side surface of the housing to support the bearing; And
And a cover coupled to a side surface of the retainer. 6. The spindle unit of claim 5, wherein the first sub air line extends from the main air line to a position adjacent the rear end of the holder through the retainer, the cover and the interior of the spindle. 6. The spindle unit of claim 5, wherein the second sub-air line extends from the main air line to the retainer and between the cover and the spindle.

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