KR102549005B1 - The rotary chuck - Google Patents

Abstract

The present invention includes a circular chuck body having a central axis and an insertion groove, a plurality of jaws inserted into the insertion groove and coupled to the chuck body, and a gripping block connected to the jaws and gripping a workpiece, the gripping block from the jaws. By including a first gripping part extending along the central axis and a second gripping part disposed at an end of the first gripping part, balancing (adjusting) work of the workpiece is easy and vibration can be suppressed.

Description

Rotary chuck {THE ROTARY CHUCK}

The present invention relates to a rotary chuck, and more particularly, to a rotary chuck for a lathe capable of facilitating workpiece balancing and suppressing vibration.

A lathe is the oldest device among machine tools and is a device for performing various cutting processes. A lathe is a device that allows work using bites to be done by human hands and machines. It operates the lathe with mechanical power and uses a conversion gear to precisely process various mechanical parts as well as thread cutting.

The main components are bed, headstock, tailstock, carriage, tool post and transfer device. A chuck is mounted at the end of the headstock, and processing is performed while supporting the workpiece. Jaws are placed in the chuck to hold the workpiece. Since the workpiece is rotated by the spindle, balance the workpiece when fixing it with the jaws. According to the prior art, a technique for fixing a workpiece with jaws has been disclosed, but is not suitable for fixing a tubular workpiece. In particular, there is a problem in that the balancing work of the tubular workpiece is not easy.

An object of one embodiment of the present invention is to provide a rotary chuck capable of facilitating balancing of workpieces and minimizing vibration.

In order to achieve the above object, a rotary chuck according to an embodiment of the present invention includes a circular chuck body having a central axis and an insertion groove, a plurality of jaws inserted into the insertion groove and coupled to the chuck body, and a jaw It is connected and includes a gripping block for gripping the workpiece, wherein the gripping block includes a first gripping part extending along a central axis from the jaw, and a second gripping part disposed at an end of the first gripping part. .

In addition, the first gripping part is disposed between the second gripping part and the jaw, and includes a plurality of recesses at least partially dug from the outer surface of the gripping block toward the inside of the gripping block, and the recessed part is formed on the outer surface of the gripping block. It is characterized in that it includes a recess groove recessed toward the inside of the gripping block, and a hill portion protruding from the bottom surface of the recess groove toward the central axis.

In addition, the recess groove includes a first recess groove and a second recess groove spaced apart from the first recess groove toward the chuck body, and the depth of the second recess groove is greater than that of the first recess groove. characterized by deep

In addition, the gripping block is characterized in that it includes a through-hole penetrating the gripping block in a direction perpendicular to the central axis, and a bolt portion fastened to the through-hole by bolts.

According to the present invention, a tubular workpiece can be stably gripped by the gripping block.

In addition, the second gripping part of the gripping block mainly contacts (supports) the workpiece between both ends of the workpiece based on the central axis direction, and the first gripping part auxiliaryly contacts the workpiece between the second gripper and the chuck body. (support), it is easy to balance the workpiece.

In addition, by minimizing the area where the gripping block contacts and supports the workpiece, it is easy to balance the workpiece.

In addition, it is possible to suppress the occurrence of vibration to the workpiece.

1 is a perspective view schematically showing a rotary chuck according to an embodiment of the present invention.
FIG. 2 is a perspective view schematically illustrating a workpiece gripped by the rotating chuck shown in FIG. 1;
Figure 3 is a view schematically showing the jaw and the gripping block shown in Figure 1;
4 is a side view schematically showing one side of the gripping block shown in FIG. 1;
5 is a front view schematically showing the front of the gripping block shown in FIG. 4;
FIG. 6 is a diagram schematically illustrating another embodiment of the gripping block shown in FIG. 5 .

Like reference numbers throughout the specification indicate substantially the same elements. In the following description, detailed descriptions of components and functions not related to the core components of the present invention and known in the art may be omitted. The meaning of terms described in this specification should be understood as follows.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are illustrative, so the present invention is not limited to the details shown. Like reference numbers designate like elements throughout the specification. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

When 'includes', 'has', 'consists', etc. mentioned in this specification is used, other parts may be added unless 'only' is used. In the case where a component is expressed in the singular, the case including the plural is included unless otherwise explicitly stated.

In interpreting the components, even if there is no separate explicit description, it is interpreted as including the error range.

In the case of a description of a positional relationship, for example, 'on top of', 'on top of', 'at the bottom of', 'next to', etc. Or, unless 'directly' is used, one or more other parts may be located between the two parts.

In the case of a description of a temporal relationship, for example, 'immediately' or 'directly' when a temporal precedence relationship is described in terms of 'after', 'following', 'next to', 'before', etc. It can also include non-continuous cases unless is used.

Although first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Therefore, the first component mentioned below may also be the second component within the technical spirit of the present invention.

"X-axis direction", "Y-axis direction", and "Z-axis direction" should not be interpreted only as a geometric relationship in which the relationship between each other is made upright, and within the range in which the configuration of the present invention can function functionally, a broader It can mean having a direction.

The term “at least one” should be understood to include all possible combinations from one or more related items. For example, "at least one of the first item, the second item, and the third item" means not only the first item, the second item, or the third item, but also two of the first item, the second item, and the third item. It may mean a combination of all items that can be presented from one or more.

Each feature of the various embodiments of the present invention can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each embodiment can be implemented independently of each other, or can be implemented together in a related relationship. may be

Hereinafter, a rotary chuck 1 according to an embodiment of the present invention will be described with reference to the drawings.

1 is a perspective view schematically showing a rotary chuck 1 according to an embodiment of the present invention, and FIG. 2 is a perspective view schematically showing a workpiece 2 gripped by the rotary chuck 1 shown in FIG. 1 3 is a view schematically showing the jaw 20 and the gripping block 30 shown in FIG. 1, and FIG. 4 is a side view schematically showing one side of the gripping block 30 shown in FIG. am.

1 to 4, the rotary chuck 1 according to an embodiment of the present invention is applied to a lathe 3. That is, the rotary chuck 1 for the lathe 3. The rotary chuck 1 is connected to a spindle (not shown) of the lathe 3 and rotates about a central axis A. A rotary chuck 1 according to an embodiment of the present invention includes a chuck body 10, a plurality of jaws 20, and a gripping block 30. The chuck body 10 has a central axis A and an insertion groove H1. The jaw 20 is inserted into the insertion groove H1 and coupled to the chuck body 10 . The gripping block 30 is connected to the jaw 20 and grips the workpiece 2 . The gripping block 30 includes a first gripping part 310 and a second gripping part 320 . In this way, the work 2 can be easily gripped and, in particular, the balance of the work 2 can be easily adjusted. Here, the work 2 may have a tubular shape having predetermined inner and outer diameters.

The chuck body 10 is connected to a spindle (not shown) of the lathe 3 extending along the central axis A. Accordingly, the chuck body 10 is rotated about the central axis A. The chuck body 10 may have a circular column shape. Accordingly, the chuck body 10 may have a circular front surface 110 and side surfaces 120 extending in the circumferential direction. In addition, the chuck body 10 may include a jaw fastening bolt 130 for fastening and fixing the jaw 20 . A plurality of insertion grooves H1 are disposed, and the plurality of insertion grooves H1 may be spaced apart at equal angles along the circumferential direction of the chuck body 10 . The insertion groove H1 may extend along the radial direction RD perpendicular to the central axis A from the side of the chuck body 10 .

The jaw 20 may be at least partially inserted into the insertion groove H1 and coupled to the chuck body 10 . A plurality of jaws 20 are disposed corresponding to the plurality of insertion grooves H1. Each of the plurality of jaws 20 may be inserted into and coupled to each of the plurality of insertion grooves H1. Thus, the plurality of jaws 20 can be spaced at equal angles in the circumferential direction. For example, four jaws 20 may be inserted into the four insertion grooves H1. Therefore, the four jaws 20 and the four insertion grooves H1 may be spaced apart at 90 degree intervals along the circumferential direction.

In one embodiment, the jaw 20 includes a combination unit 210 and the body unit 220. The rough coupling part 210 is inserted into the insertion groove H1. Coupling portion 210 may extend to a predetermined length along the central axis (A). The coarse body portion 220 is connected to the coarse coupling portion 210 . At least a portion of the jaw body 220 may be disposed to protrude from the front 110 of the chuck body 10 along the central axis A. The gripping block 30 is connected to the coarse body 220 and may extend from the coarse body 220 along the central axis A.

The rough body part 220 may include a roughing part 221 . The roughing part 221 is disposed on the rough body part 220 and may be disposed toward the central axis (A). The gripping unit 221 may grip a predetermined workpiece (not shown). As an example, each of the four roughing parts 221 may be disposed on each of the four roughing body parts 220 . One pair of the four roughing parts 221 are disposed to face each other. The four wavemaking parts 221 may be spaced apart at equal intervals along the circumferential direction. As a result, the four gripping parts 221 can grip a predetermined workpiece. In particular, the gripping unit 221 includes a plurality of protrusions protruding toward the central axis A and a groove disposed between the plurality of protrusions, to facilitate adjustment (fitting) of the balancing of the workpiece to be gripped (not shown) can do.

On the other hand, the fastening bolt 130 may be inserted into the insertion groove (H1) and bolted to the inner circumferential surface of the insertion groove (H1). Also, the jaw 20 may include a plurality of fastening protrusions 240 and a plurality of fastening grooves 230 . A plurality of fastening protrusions 240 and a plurality of fastening grooves 230 may be alternately arranged along the central axis (A). The fastening bolt 130 is fastened to the insertion groove H1, and may be fastened toward the jaw 20. The jaw 20 may be fixed by contacting the fastening bolt 130 with the plurality of fastening protrusions 240 and the plurality of fastening grooves 230 . Therefore, the position of the jaw 20 with respect to the central axis (A) can be adjusted depending on which fastening protrusion 240 of the plurality of fastening protrusions 240 is in contact with the fastening bolt 130 .

The first gripping part 310 extends from the jaw 20 along the central axis A. The second gripping part 320 is disposed at an end of the first gripping part 310 . The first gripping part 310 includes a plurality of recessed parts 311 . The plurality of recessed parts 311 may be sequentially disposed on the first gripping part 310 along the central axis A. The plurality of recessed parts 311 may be disposed between the jaw 20 and the second gripping part 320 . The recess portion 311 may be formed by at least partially dug from the outer surface S of the gripping block 30 toward the inner side of the gripping block 30 . Due to the plurality of recessed portions 311, the contact (support) area between the second gripping portion 320 and the work 2 is greater than the contact (supporting) area between the first gripping portion 310 and the work 2. it gets bigger Accordingly, the contact (support) area between the gripping block 30 and the work 2 can be reduced, and balancing (adjustment) of the work 2 can be facilitated.

As an example, the recess portion 311 may include a recess groove 3111 and a hill portion 3112 . The recess groove 3111 may be a groove recessed from the outer surface S of the gripping block 30 toward the inner side of the gripping block 30 . The hill portion 3112 may protrude from the bottom surface of the recess groove 3111 toward the central axis A. The hill portion 3112 may protrude from the recess groove 3111 toward the chuck body 10 in a stepped shape or may gradually protrude at an angle. Accordingly, when the work 2 is balanced, a part of the hill portion 3112 may come into contact with the work 2 to support the work 2 . Accordingly, when the work 2 is balanced, the contact area between the work 2 and the gripping block 30 is reduced, and balancing (adjustment) of the work 2 is facilitated. In addition, since the contact (support) positions of the work 2 and the gripping block 30 are aligned along the central axis A, vibration during rotation of the work 2 can be suppressed.

The recess groove 3111 may include a first recess groove 3111a and a second recess groove 3111b. The second recess groove 3111b may be spaced apart from the first recess groove 3111a toward the chuck body 10 . The first recess groove 3111a and the second recess groove 3111b are disposed adjacent to each other, or another recess groove 3111 is disposed between the first recess groove 3111a and the second recess groove 3111b. At least one of these may be arranged. That is, the second recess groove 3111b may be a recess groove 3111 disposed between the first recess groove 3111a and the chuck body 10 . Here, the depth D of the second recess groove 3111b may be greater than the depth D of the first recess groove 3111a. Accordingly, when the work 2 is balanced, the contact area between the work 2 and the gripping block 30 is minimized, thereby facilitating the balancing of the work 2 .

FIG. 5 is a front view schematically showing the front of the gripping block 30 shown in FIG. 4 .

Referring to FIGS. 1 to 5 , the holding block 30 may have a convex curved surface R from the outer surface toward the inner side. The curved surface R may extend along the direction of the central axis A. That is, the first gripping part 310 and the second gripping part 320 may have a curved surface R. As a result, the workpiece 2 and the gripping block 30 can be contacted (supported) only between both ends of the curved surface R on a cross section perpendicular to the central axis A, and at both ends of the curved surface R, the workpiece ( 2) and the holding block 30 may not contact (support). Accordingly, balancing of the workpiece 2 can be facilitated. In addition, since at least a part of the work 2 and the gripping block 30 are contacted (supported) in the direction of the central axis A, shaking can be suppressed. For example, the radius of curvature of the curved surface R of the gripping block 30 may be greater than the radius of curvature of the workpiece 2 .

The holding block 30 may have one surface S1 facing the central axis A and the other surface S2 facing the one surface S1. The rotary chuck 1 according to an embodiment of the present invention may further include a third gripping part 340 and a fourth gripping part 350 . The third gripping part 340 may be disposed to face the first gripping part 310 . The fourth gripping part 350 may be disposed to face the second gripping part 320 . The first gripping part 310 is disposed on one surface S1 of the gripping block 30, and the third gripping part 340 is disposed on the other surface S2 of the gripping block 30. The second gripping part 320 is disposed on one surface S1 of the gripping block 30, and the fourth gripping part 350 is disposed on the other surface S2 of the gripping block 30. Accordingly, the workpiece 2 having the first outer diameter can be supported by the first gripping part 310 and the second gripping part 320, and the workpiece 2 having a second outer diameter larger than the first outer diameter It may be supported by the third gripping part 340 and the fourth gripping part 350 .

The third gripping part 340 includes a plurality of recessed parts 311 like the first gripping part 310 . Accordingly, the third gripping part 340 may contact (support) the workpiece 2 less than the fourth gripping part 350 . This is the same as the first gripping part 310 and the second gripping part 320 described above. Also, the recessed part 311 of the third gripping part 340 may have the same characteristics as the recessed part 311 of the first gripping part 310 .

The third gripping part 340 and the fourth gripping part 350 may have a curved surface R. As a result, the workpiece 2 and the gripping block 30 can be contacted (supported) only between both ends of the curved surface R on a cross section perpendicular to the central axis A, and at both ends of the curved surface R, the workpiece ( 2) and the holding block 30 may not contact (support). Accordingly, balancing of the workpiece 2 can be facilitated. In addition, since at least a part of the work 2 and the gripping block 30 are contacted (supported) in the direction of the central axis A, shaking can be suppressed. For example, the radius of curvature of the curved surfaces R of the third gripping unit 340 and the fourth gripping unit 350 may be larger or smaller than the radius of curvature of the workpiece 2 . In addition, the radius of curvature of the curved surfaces R of the third gripping unit 340 and the fourth gripping unit 350 may be the same as the radius of curvature of the workpiece 2 . By the curved surfaces R of the third and fourth gripping parts 340 and 350, the workpiece 2 may be supported at both ends of the curved surface R in cross section perpendicular to the central axis A. Therefore, it is possible to facilitate balancing of the workpiece 2 and to suppress shaking by supporting it along the direction of the central axis A.

FIG. 6 is a diagram schematically showing another embodiment of the gripping block 30 shown in FIG. 5 .

4 and 6, the first gripping part 310 and the second gripping part 320 disposed on one surface S1 of the gripping block 30 are convex curved surfaces from one surface S1 toward the other surface S2. (R) may have. In addition, the third gripping part 340 and the fourth gripping part 350 disposed on the other surface S2 of the gripping block 30 may have a convex curved surface R from one surface S1 toward the other surface S2. there is. That is, the convex direction of the curved surface R on one surface S1 and the other surface S2 may be the same. According to this, in the case of the first gripping unit 310 and the second gripping unit 320, the workpiece 2 is held between both ends of the curved surface R in cross section perpendicular to the central axis A, the gripping block 30 This contact (support) can be made. In addition, in the case of the third gripping unit 340 and the fourth gripping unit 350, the gripping block 30 holds the work 2 between both ends of the curved surface R on a cross-section perpendicular to the central axis A. You can contact (support). That is, the gripping block 30 can stably support the workpiece 2 .

Referring to FIGS. 1 to 6 , the gripping block 30 may further include a through hole H2 and a bolt part 330 . The through hole H2 penetrates (extends) the gripping block 30 in a radial direction RD perpendicular to the central axis A. The bolt part 330 is inserted into the through hole H2. The bolt unit 330 may be inserted into the through hole H2 and fastened to the holding block 30 by bolts. The bolt unit 330 may move along the through (extension) direction of the through hole H2 according to the fastening direction. Accordingly, the bolt part 330 may move toward one surface S1 or the other surface S2 of the gripping block 30 to adhere closely to and support the workpiece 2 . In particular, a straight line L connecting the centers of the through holes H2 or the centers of the bolt parts 330 may extend parallel to the central axis A. Thereby, shaking can be suppressed.

Although the invention made by the present inventors has been specifically described according to the above embodiments, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention.

1 : rotary chuck
2: Workpiece
10: chuck body
110: front
120: side
130: pre-tightening bolt
20: Joe of Revenge
210: combination part
220: Zobadi part
221: Jopa branch
230: fastening groove
240: fastening protrusion
30: gripping block
310: first gripping part
311: recess part
320: second gripping part
330: bolt part
340: third gripping branch
350: 4th gripping part

Claims (4)

A circular chuck body having a central axis and an insertion groove;
A plurality of jaws inserted into the insertion groove and coupled to the chuck body; and
It is connected to the jaw and includes a gripping block for gripping the workpiece,
The phage block,
A first gripping portion extending from the jaw along the central axis; and
A second gripping part disposed at an end of the first gripping part,
The first gripping part is disposed between the second gripping part and the jaw, and includes a plurality of recesses at least partially dug from the outer surface of the gripping block toward the inner side of the gripping block,
Recess part,
Recess grooves recessed from the outer surface of the gripping block toward the inner side of the gripping block; and
Including a hill portion protruding from the bottom surface of the recess groove toward the central axis,
The recess groove includes a first recess groove and a second recess groove spaced apart from the first recess groove toward the chuck body,
The depth of the second recess groove is greater than that of the first recess groove;
The first gripping part and the second gripping part have convex curved surfaces from the outer surface of the gripping block toward the inner side of the rotary chuck.
delete delete According to claim 1,
The phage block,
A through hole penetrating the gripping block in a direction perpendicular to the central axis; and
A rotary chuck including a bolt part bolted to a through hole.

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