KR102375704B1 - Tool machine having tailstock - Google Patents

Abstract

The machine tool includes a bed, a guide rail extending in a first direction on an upper surface of the bed, a tailstock installed to be movable along the guide rail, and a clamp unit installed between the tailstock and the guide rail. The clamp unit is movable along the guide rail and is coupled to a part of the tailstock to move integrally with the clamp body and the clamp body to be movable on the clamp body, and to fix the clamp body to the guide rail. and at least one clamper for constraining movement of the tailstock in the first direction.

Description

Machine tool with tailstock {TOOL MACHINE HAVING TAILSTOCK}

The present invention relates to a machine tool having a tailstock. More particularly, it relates to an NC lathe or turning sensor with a tailstock.

Among machine tools, NC lathes or turning centers may include a tailstock for supporting the distal end of a relatively long workpiece in order to prevent sagging of the workpiece. This tailstock can be varied in position to support a variety of workpieces.

In the tailstock according to the related art, since the tailstock needs to be moved using a traction bar, several steps are required to move the tailstock, and accordingly, a considerable amount of time is required. In addition, since the conventional tailstock consists of a body and a base and parts for adjusting the height and left and right directions are disposed between them, the number and shape of the tailstock itself becomes complicated, and the precision work takes a lot of time. there is.

An object of the present invention is to provide a machine tool having a simple structure and having a tailstock device capable of easily moving and fixing the tailstock to a desired position.

A machine tool according to exemplary embodiments for achieving the object of the present invention includes a bed, a guide rail installed extending in a first direction on an upper surface of the bed, a tailstock installed to be movable along the guide rail, and the shim and a clamp unit installed between the mandrel and the guide rail. The clamp unit is movable along the guide rail and is coupled to a part of the tailstock to move integrally with the clamp body and the clamp body to be movable on the clamp body, and to fix the clamp body to the guide rail. and at least one clamper for constraining movement of the tailstock in the first direction.

In example embodiments, the clamp body may have two openings exposing both sides of the guide rail, and the two clampers may be respectively arranged to be movable within the openings.

In example embodiments, the openings may extend in a second direction perpendicular to the first direction, and the two clampers may move in the second direction.

In example embodiments, the clamp unit may further include clamp bolts that are fastened to the screw holes of the clampers and closely fix the clampers to both sides of the guide rail, respectively.

In exemplary embodiments, the clamp unit may further include a lever for rotating the clamp bolt in combination with the head of the clamp bolt.

In exemplary embodiments, the clamp unit may further include a limit bolt for selectively coupling the clamp bolt and the lever.

In example embodiments, the tailstock may further include a fixing block fixed to a fastening plate protruding from one side of the tailstock and coupled to at least one side of the clamp body.

In example embodiments, the fixing block may include a first extension in contact with an upper surface of the clamp body and a second extension in contact with one side of the clamp body.

In exemplary embodiments, the machine tool may further include a chuck disposed to face the tailstock on the upper surface of the bed and clamping one end of the workpiece.

In exemplary embodiments, the tailstock may include a tailstock center that contacts and supports the other end of the workpiece.

According to exemplary embodiments, the machine tool may include a tailstock movable along a guide rail on an upper surface of a bed and a clamp unit installed between the guide rail and the tailstock to fix the tailstock at a desired position. can The clamp unit may be movable along the guide rail and include a clamp body coupled to one side of the tailstock to move integrally with the tailstock, and at least for fixing the clamp body to the guide rail to restrict movement of the tailstock. It may include one clamp.

Therefore, the operator can easily move the tailstock to a desired position using the LM guide and fix it through the clamp unit. It is possible to manufacture a single integrated tailstock that has been separated from the conventional body and base, and since a traction bar is not used for transporting the tailstock, the number of parts can be reduced and manufacturing can be facilitated.

However, the effects of the present invention are not limited to the above-mentioned effects, and may be variously expanded without departing from the spirit and scope of the present invention.

1 is a perspective view showing a machine tool according to exemplary embodiments.
FIG. 2 is a front view showing the machine tool of FIG. 1 .
3 is an exploded perspective view illustrating a tailstock device installed on a bed of the machine tool of FIG. 1 .
4 is a cross-sectional view showing the tailstock device of the machine tool of FIG. 1 .
5 is a cross-sectional view showing a fixing block of the head stock device of FIG. 4 .
Fig. 6 is an exploded perspective view showing a clamp unit of the tailstock device of Fig. 4;
7A is a perspective view illustrating a clamp bolt of the clamp unit of FIG. 6 .
Fig. 7B is a front view showing a lever engaged with the clamp bolt of Fig. 7A;
8A is a perspective view illustrating a clamp bolt of a clamp unit according to another embodiment. Fig. 8B is a front view showing the lever engaged with the clamp bolt of Fig. 8A;
9 is a perspective view illustrating a clamp unit according to another embodiment.

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

In each drawing of the present invention, the dimensions of the structures are enlarged than the actual size for clarity of the present invention.

In the present invention, terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

The terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

With respect to the embodiments of the present invention disclosed in the text, specific structural or functional descriptions are only exemplified for the purpose of describing the embodiments of the present invention, and the embodiments of the present invention may be embodied in various forms and the text It should not be construed as being limited to the embodiments described in

That is, since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

1 is a perspective view showing a machine tool according to exemplary embodiments. FIG. 2 is a front view showing the machine tool of FIG. 1 . 3 is an exploded perspective view illustrating a tailstock device installed on a bed of the machine tool of FIG. 1 . 4 is a cross-sectional view showing the tailstock device of the machine tool of FIG. 1 . 5 is a cross-sectional view showing a fixing block of the head stock device of FIG. 4 . Fig. 6 is an exploded perspective view showing a clamp unit of the tailstock device of Fig. 4; 7A is a perspective view illustrating a clamp bolt of the clamp unit of FIG. 6 . Fig. 7B is a front view showing a lever engaged with the clamp bolt of Fig. 7A;

1 to 7B, the machine tool 10 includes a headstock 110 for clamping a workpiece on a bed 100, a tool rest device for transporting a tool on the bed 100 to process the workpiece (not shown), and a tailstock device disposed to face the spindle 110 and configured to support the workpiece.

In exemplary embodiments, the machine tool 10 may be a horizontal NC lathe or turning center. Here, the Z direction (first direction) is the longitudinal direction of the bed 100 , the X direction (second direction) is orthogonal to the Z direction and is a direction for feeding the tool toward the workpiece, and the Y direction (third direction) ) may be a direction orthogonal to the Z direction and the X direction.

The bed 100 may have an inclined upper surface with respect to a horizontal plane for smooth discharge of chips issued during processing. For example, the upper surface may have an inclination of a certain angle with respect to the horizontal plane. Accordingly, the X direction may also have an inclination of a certain angle with respect to the horizontal plane. The tool rest device may be installed to be slidably movable in the Z direction on the upper surface of the bed 100 .

The headstock 110 may include a chuck 112 for clamping one end of the workpiece. As the chuck 112 is rotated by the main shaft, the fixed workpiece can be rotated.

In exemplary embodiments, the tailstock device includes a tailstock 200 installed to be movable along a guide rail 130 installed on the upper surface of the bed 100 , and a first direction (Z direction) of the tailstock 200 . ) may include a clamp unit 300 for constraining the movement.

The tailstock 200 is disposed to face the main shaft 110 and may include a tailstock center 210 for contacting and supporting the other end of the fixed workpiece. For example, the tailstock center may include a live center or the like. When one end of a long workpiece having a shaft shape or a pipe shape is clamped to the chuck 112, the user can manually move the tailstock 200 to a desired position according to the length of the workpiece to contact and support the other end of the workpiece. there is.

Specifically, the tailstock 200 may be installed to be movable on the LM guide. The LM guide may include a guide rail 130 installed extending in the first direction on the upper surface of the bed 100 and a plurality of LM blocks 132 sliding along the guide rail 130 . For example, the friction coefficient μ of the LM guide may be about 0.001 to 0.004.

A plurality of guide rails may be provided, and the plurality of guide rails may be spaced apart from each other in a second direction (X direction) orthogonal to the first direction. For example, the two guide rails 130 may be spaced apart from each other. A cover plate 134 is disposed between the two guide rails 130 to prevent chips from accumulating on the bed 100 between the rails 130 .

The tailstock 200 is fixedly supported on the LM blocks 132 to slide along the guide rails 130 . The tailstock 200 may include an integrated body in which the body and the base are not separated from each other. The lower portion of the integral body of the tailstock 200 may include a lower plate 202 having fastening holes for coupling with the LM blocks 132 . The tailstock 200 may be coupled to the LM blocks 132 by fastening screws through the fastening holes of the lower plate.

The tailstock 200 may include three first to third side plates 230a, 230b, 230b for preventing chips from penetrating between the lower plate of the tailstock 200 and the guide rail 130 . can The first side plate 230a is installed on the front lower side of the tailstock 200 , the third side plate 230c is installed on the rear lower side of the tailstock 200 , and the second side plate 230b is installed on the rear lower side of the tailstock 200 . It may be installed on the lower right side of the tailstock 200 . The front may be in a direction closer to the headstock 110 , the rear may be in a direction away from the headstock 110 , and the right side may be in a direction closer to the rear of the bed 100 .

The adjustment plates 240 may be disposed between the LM blocks 132 and the lower plate of the tailstock 200 to perform a precision operation of the tailstock 200 . The adjustment plates 240 are respectively disposed on the LM blocks 132 to adjust the height of the tailstock 200 .

In exemplary embodiments, the clamp unit 300 is installed between the tailstock 200 and the guide rail 130, and the weight of the workpiece while the tailstock 200 supports the workpiece in a desired position. However, the tailstock 200 may be restrained so that the tailstock 200 is not pushed in a direction away from the chuck 112 , that is, backward (first direction) by a machining load.

Specifically, the clamp unit 300 is movable along the guide rail 130 and is coupled to a part of the tailstock 200 to move integrally with the tailstock 200 and at least one clamp body 310 and the clamp body. At least one clamper 320 disposed so as to be movable on the 310 and fixing the clamp body 310 to the guide rail 130 to constrain the movement of the tailstock 200 in the first direction. can

The clamp body 310 may have a guide groove 311 formed at a lower center thereof. The guide groove 311 has an open shape on the lower surface, and the guide groove 311 may be formed to extend in the first direction. The guide groove 311 may have a sufficient depth to accommodate at least a portion of the guide rail 130 . Accordingly, the guide groove 311 is engaged with the guide rail 130 so that the clamp body 310 can slide on the guide rail 130 . The guide groove 311 may cover both side surfaces and an upper surface of the guide rail 130 . The two clamp bodies 310 may be disposed to be slidable on one guide rail 130 . The number of the clamp bodies is not limited thereto, and may be determined in consideration of a coefficient of friction of the LM guide, the weight of the ten-barrel, a thrust acting on the ten-barrel, and the like. The positions of the clamp bodies may be disposed on the front side of the bed 100 in consideration of the operator's accessibility, operability, and the like.

The clamp body 310 may have two openings 312 extending along the length direction of the clamp body 310 . The two openings 312 may extend in a second direction orthogonal to the first direction and communicate with each other. A portion of each of the openings 312 may communicate with the guide groove 311 . Accordingly, the two openings 312 may partially expose both side surfaces of the guide rail 130 .

The two clampers 320 may be respectively disposed to be movable within the two openings 312 . The clamper 320 may be movable in the second direction within the opening 312 .

The clamp unit 300 is fastened to the screw holes 322 of the clampers 320 and may further include clamp bolts 330 for closely fixing the clampers 320 to both sides of the guide rail 130, respectively. there is.

The screw hole 322 may be formed to extend along an eccentric axis deviated upward from the central axis C of the clamper 320 . As the clamp bolt 330 fastened to the screw holes 322 of the two clampers 320 rotates in one direction, the two clampers 320 move in a direction closer to each other and both sides of the guide rail 130 . can be adhered to. A protrusion 324 may be formed on one side of the clamper 320 facing the guide groove 311 .

The two clampers 320 are located on both sides of the guide rail 130 , and as the clamp bolt 330 rotates, the clampers 320 slide within the openings 312 of the clamp body 310 by a fastening force. can move When the clamper 320 moves toward one side of the guide rail 130 , the protrusion 324 of the clamper 320 engages with a groove on one side of the guide rail 130 to attach the clamp body 310 to the guide rail 130 . ) can be fixed.

As shown in FIG. 5 , the tailstock 200 is fixed to the fastening plate 220 protruding from one side of the tailstock 200 and a fixing block 222 coupled to at least one side of the clamp body 310 . may further include. A fastening plate 220 protruding forward is provided at a front lower portion of the integral body of the tailstock 200 , and the fixing block 222 may be fixedly installed under the fastening plate 220 .

The fixing block 222 may include a first extension 223a in contact with the upper surface of the clamp body 310 and a second extension 223b in contact with one side of the clamp body 310 . The first extension 223a may extend in the first direction (Z direction), and the second extension 223b may extend in the third direction (Y direction). Accordingly, the clamp body 310 is coupled to one side of the tailstock 200 including the fixing block 222 to move on the guide rail 130 integrally with the tailstock 200 .

Accordingly, the clamp body 310 is fixed to the guide rail 130 by the clampers 320 , so that the tailstock 200 is fixed to the guide rail 130 , so that the tailstock 200 is adjusted to a material weight or a machining load. It can be fixed so that it does not slide backward by the

Alternatively, the fastening plate 220 of the tailstock 200 may directly include the second extension. Accordingly, the tailstock 200 may be directly coupled to the clamp body 310 without the fixing block 222 .

In exemplary embodiments, the clamp unit 300 may further include a lever 340 for rotating the clamp bolt 330 in combination with the head 332 of the clamp bolt 330 . In addition, the clamp unit 300 may further include a limit bolt 350 for selectively coupling the clamp bolt 330 and the lever 340 .

One end of the lever 340 may have a structure coupled to the head 332 of the clamp bolt 330 . 7A and 7B, the head 332 of the clamp bolt 330 has a pentagonal convex shape, and one end of the lever 340 has a pentagonal concave shape engaged with the pentagonal convex shape. It may have an engaging portion 342 .

The limit bolt 350 may pass through the center through hole of the engaging portion 342 of the lever 340 and be fastened to the center screw hole of the head 332 of the clamp bolt 332 . The limit bolt 350 provides a certain distance between the clamp bolt 330 and the lever 340, and if necessary, the operator moves the lever 340 by rotating the limit bolt 350 to the clamp bolt 330 and After coupling, the tailstock 200 may be fixed. The limit bolt 350 can prevent the case where the fixing of the tailstock 200 is loosened by touching the lever 340 due to an operator's mistake.

8A is a perspective view illustrating a clamp bolt of a clamp unit according to another embodiment. Fig. 8B is a front view showing the lever engaged with the clamp bolt of Fig. 8A;

8A and 8B, the head 332 of the clamp bolt 330 has a quadrangular key shape, and one end of the lever 340 has a quadrangular keyway shape engaged with the quadrangular key shape. It may have an engaging portion 342 . Alternatively, the head 332 of the clamp bolt 330 and the engaging portion 342 of the lever 340 may have a serration shape engaged with each other.

9 is a perspective view illustrating a clamp unit according to another embodiment.

Referring to FIG. 9 , the clamp bolt 330 may be rotated by the wrench 400 to closely fix the two clampers 320 to both sides of the guide rail 130 . As such, the method for fixing the clampers of the clamp unit is not limited thereto, and it will be understood that various fixing means may be used.

Hereinafter, the operation of the clamp unit will be described.

First, the clamp body 310 of the clamp unit 300 is constrained to the tailstock 200 in the Z direction through the fixing block 222 . That is, the tailstock 200 can move along the guide rail 130 along with the clamp body 310 in the Z direction. On the other hand, when the clamp body 310 is fixed to the guide rail 130 , the tailstock 200 ) can also be fixed.

When the clamp unit is in the unclamped state, the operator can move the tailstock 200 forward toward the chuck 112 or backward in the opposite direction of the chuck 112 . At this time, the clamp unit moves together with the tailstock 200 .

When the clamp unit is clamped, the tailstock 200 is fixed on the guide rail 130 by the clamp unit and cannot move in the Z direction.

In the clamping operation of the unit of the clamp, as the operator rotates the lever 340, the torque is transmitted as the fastening force of the clamp bolt 330, and the clampers 320 move finely to closely contact the guide rail 130. can be fixed

As described above, the operator can easily move the tailstock to a desired position using the LM guide and fix it through the clamp unit. It is possible to manufacture a single integrated tailstock that has been separated from the conventional body and base, and since a traction bar is not used for transporting the tailstock, the number of parts can be reduced and manufacturing can be facilitated.

Although the above has been described with reference to the embodiments of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below. You will understand that you can.

10: machine tool 100: bed
112: chuck 130: guide rail
132: LM blockw 134: cover plate
200: tailstock 202: lower plate
210: tailstock center 220: fastening plate
222: fixing block 223a: first extension
223b: second extension
230a, 230b, 230c: side plate 240: adjustment plate
300: clamp unit 310: clamp body
311: guide groove 312: opening
320: clamper 322: screw hole
324: protrusion 330: clamp bolt
332: head 340: lever
342: engaging portion 350: limit bolt

Claims (10)

bed;
a guide rail extending in a first direction on the upper surface of the bed;
a tailstock installed to be movable along the guide rail; and
a clamp body installed between the tailstock and the guide rail, movable along the guide rail, and coupled to a part of the tailstock to move integrally with the tailstock; and a clamp body movable on the clamp body; and a clamp unit including at least one clamper for fixing to the guide rail to constrain movement of the tailstock in the first direction;
The clamp body has two openings exposing both sides of the guide rail, and the two clampers are respectively arranged to be movable within the openings. delete The machine tool according to claim 1, wherein the openings extend in a second direction orthogonal to the first direction, and the two clampers are movable in the second direction. The machine tool according to claim 1, wherein the clamp unit further comprises clamp bolts fastened to the screw holes of the clampers and closely fixing the clampers to both sides of the guide rail, respectively. The machine tool according to claim 4, wherein the clamp unit further comprises a lever for rotating the clamp bolt by being coupled to a head of the clamp bolt. The machine tool according to claim 5, wherein the clamp unit further comprises a limit bolt for selectively coupling the clamp bolt and the lever. The machine tool according to claim 1, wherein the tailstock further includes a fixing block that is fixed to a fastening plate protruding from one side of the tailstock and engages with at least one side of the clamp body. The machine tool according to claim 7, wherein the fixing block includes a first extension portion in contact with an upper surface of the clamp body and a second extension portion in contact with one side surface of the clamp body. The machine tool according to claim 1, further comprising a chuck disposed on the upper surface of the bed to face the tailstock and clamping one end of the workpiece. The machine tool according to claim 9, wherein the tailstock includes a tailstock center that contacts and supports the other end of the workpiece.

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