Tail stock of machine tool

Abstract

The present invention relates to a tail stock of a machine tool, comprising: a housing portion; a piston unit arranged at one side in the housing portion; a quill portion which is arranged in the housing portion to be linearly reciprocatable with respect to the piston unit and supports a workpiece; an advancing flow path portion which is provided with a drain hole and is formed in the piston unit in order to flow in or discharge pressure for advancing the quill portion; a return flow path portion which is formed in the piston unit in order to flow in or discharge pressure for returning the quill portion to an origin; and a groove portion formed in a pressing surface at one end of the piston unit, which is adjacent to the quill portion.

Description

Tailstock of a machine tool

[0001] The present invention relates to a tailstock of a machine tool, and more particularly, to a tailstock of a machine tool for buffering the impact between a quill part and a pressing surface when the quill part returns to the origin.

[0002] In general, a machine tool refers to a machine used for the purpose of processing a metal / non-metal workpiece into a desired shape and size using an appropriate tool using various cutting or non-cutting processing methods.

[0003] Various types of machine tools, including turning centers, vertical / horizontal machining centers, gate-type machining centers, Swiss turns, electrical discharge machines, horizontal NC boring machines, CNC lathes, and multi-tasking machines, are widely used in various industrial fields for their respective tasks.

[0004] Among machine tools, a multi-tasking machine (MTM) is a turning center equipped with a multi-functional automatic tool changer (ATC) and a tool magazine, capable of performing a variety of machining operations, including turning, drilling, tapping, and milling. In a multi-tasking machine, the operator manually loads or replaces tools required for machining into the tool magazine.

[0005] Many types of machine tools in use today typically feature control panels utilizing numerical control (NC) or computerized numerical control (CNC) technology. These panels feature various function switches or buttons and a monitor.

[0006] In addition, the machine tool is equipped with a table on which the workpiece material is placed and transferred for processing the workpiece, a pallet for preparing the workpiece before processing, a spindle on which a tool or workpiece is combined and rotates, a tailstock for supporting the workpiece during processing, a vibration damper, etc.

[0007] Typically, in machine tools, the table, tool rest, spindle, tailstock, and oscillation unit are equipped with a transfer unit that moves along the transfer axis to perform various processing operations.

[0008] Additionally, machine tools generally use multiple tools for various processing operations, and tool magazines or turrets are used as tool storage spaces for storing multiple tools.

[0009] These machine tools use multiple tools for various processing tasks, and a tool magazine is used as a tool storage space to store multiple tools.

[0010] Additionally, machine tools are generally equipped with an automatic tool changer (ATC) to retrieve or retract a specific tool from the tool magazine under the command of the numerical control unit in order to improve the productivity of the machine tool.

[0011] Additionally, machine tools are typically equipped with an automatic pallet changer (APC) to minimize downtime. The APC automatically exchanges pallets between the workpiece processing area and the workpiece installation area. Pallets can be loaded with workpieces.

[0012] Additionally, machine tools are broadly categorized into turning centers and machining centers based on their machining methods. Generally, turning centers rotate the workpiece, while machining centers process the workpiece with a rotating tool.

[0013] Generally, a machine tool that can perform multiple machining processes, such as turning, milling, drilling, tapping, and boring, in a single workpiece step is called a multi-task center (or integrated mill turn center). Using such a multi-task center can reduce lead times, component counts, workloads, and workspace requirements, while also improving productivity and precision.

[0014] Among these, a turning center, also called a lathe, is a device that processes a workpiece by rapidly rotating a workpiece mounted on a spindle and bringing a tool close to it.

[0015] In particular, the turning center may include a tailstock for fixedly supporting the free end of the workpiece.

[0016] The tailstock is movably placed within the machine tool to support the free end of the workpiece, prevent sagging or buckling of the workpiece, and improve the quality of the workpiece.

[0017] The quill part is installed on the piston part to support the workpiece, and the quill part moves forward or returns to the origin (reverses) with respect to the piston part.

[0018] In the past, the tailstock of a machine tool had a problem in that noise was generated when the piston part collided with the quill part during the forward or return-to-origin (reverse) movement of the quill part.

[0019] In the past, the tailstock of a machine tool applied a method of slowing down the return to origin (reverse) speed of the quill by installing a separate speed control valve in the hydraulic line for the operation of the quill as a solution to the noise generation problem described above.

[0020] However, although the noise generation problem described above can be improved by installing a separate speed control valve in this way, another problem occurred that caused an increase in non-processing time as the return to the origin (reverse) speed of the quill part was slowed down.

[0021] In addition, there was a problem that additional assembly time was required for adjusting the speed control valve to fix the speed control valve in order to find a condition where the noise was not too loud and the return to the origin (reverse) speed of the quill part was not too slow.

[0022] The present invention is to solve the above problems, and the purpose of the present invention is to provide a tailstock of a machine tool that can reduce noise generation while allowing the quill to quickly return to the origin by generating a vortex through a groove portion when the quill portion returns to the origin, thereby buffering the impact between the quill portion and the pressurized surface, reducing the maintenance cost of the tailstock, and increasing productivity by reducing non-processing time.

[0023] In order to achieve the object of the present invention, a tailstock of a machine tool according to the present invention may include: a housing; a piston portion disposed on one side of the inside of the housing portion; a quill portion disposed within the housing portion to be capable of linearly reciprocating relative to the piston portion and supporting a workpiece; a forward passage portion formed in the piston portion, the piston portion having a drain hole, for introducing or discharging pressure for moving the quill portion forward; a return passage portion formed in the piston portion for introducing or discharging pressure for returning the quill portion to the origin; and a groove portion formed on a pressure surface of one end of the piston portion adjacent to the quill portion.

[0024] In addition, in a preferred embodiment of the tailstock of the machine tool according to the present invention, when the quill part moves in a direction adjacent to the pressure surface to return the quill part to the origin and pressure flows out through the forward passage part, a vortex is generated through the groove part to cushion the impact between the quill part and the pressure surface.

[0025] Additionally, in a preferred embodiment of the pressure plate of the machine tool according to the present invention, the drain hole may be arranged at the center of the pressure surface.

[0026] In addition, in a preferred embodiment of the pressure plate of the machine tool according to the present invention, the groove portion may be formed so as to be in a tangential direction to the flow direction of the pressure flowing out through the forward passage portion.

[0027] In addition, in a preferred embodiment of the pressure plate of the machine tool according to the present invention, the groove portion may be formed in a plurality of concentric circles based on the center of the drain hole.

[0028] In addition, in a preferred embodiment of the pressure plate of the machine tool according to the present invention, the spacing between the plurality of concentric circles may be formed to be 0.1 times or more and 0.3 times or less of the diameter of the pressurizing portion.

[0029] In addition, in a preferred embodiment of the pressure plate of the machine tool according to the present invention, the groove portion may be formed in a plurality of circular cross-sectional shapes.

[0030] In addition, in a preferred embodiment of the pressure plate of the machine tool according to the present invention, the groove portion may be formed in a plurality of pieces with a rectangular cross-sectional shape.

[0031] In addition, in a preferred embodiment of the pressure plate of the machine tool according to the present invention, the groove portion may be formed in a plurality of pieces with an oval cross-sectional shape.

[0032] In addition, in a preferred embodiment of the pressure plate of the machine tool according to the present invention, the forward passage section may be formed in the piston section to be bent at least once.

[0033] The tailstock of the machine tool according to the present invention has the effect of allowing the quill to quickly return to the origin while reducing noise caused by the impact between the quill and the pressurized surface by generating a vortex through a groove formed on one end of the pressurized surface of the piston when the quill returns to the origin, thereby buffering the impact between the quill and the pressurized surface.

[0034] In addition, since the tailstock of the machine tool according to the present invention does not require a separate speed control valve to be installed as in the past, there is an effect of reducing the manufacturing cost of the tailstock by omitting the cost for installing the speed control valve.

[0035] Moreover, the tailstock of the machine tool according to the present invention has a separate speed adjustment valve as in the prior art, so that the noise is not excessive and the speed of returning to the origin (reverse movement) of the quill part is not too slow, and the speed adjustment valve is fixed by finding a condition where no additional assembly time is required for adjusting the speed adjustment valve, so that the speed adjustment valve assembly time can be reduced.

[0036] In addition, the tailstock of the machine tool according to the present invention has the effect of maximizing productivity by shortening the machining cycle time, as a vortex is generated through the groove portion when the quill portion returns to the origin, thereby buffering the impact between the quill portion and the pressurized surface, thereby allowing the quill portion to quickly return to the origin.

[0037] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

[0038] Figure 1 shows a side cross-sectional view of the quill portion of the pressure plate of the machine tool according to the present invention in a forward state.

[0039] Figure 2 shows a side cross-sectional view of the quill section of the pressure plate of the machine tool according to the present invention in a state immediately before returning to the origin.

[0040] Figure 3 shows a side cross-sectional view of the quill part of the pressure plate of the machine tool according to the present invention in a state where it has returned to the origin.

[0041] Figure 4 (a) is a drawing showing the flow direction in which pressure flows out through the forward flow path when the groove portion is not formed when the quill portion returns to the origin, and (b) is a drawing showing the appearance of a vortex formed when pressure flows out through the forward flow path when the groove portion is formed when the quill portion returns to the origin.

[0042] The left drawing of Fig. 5 is a front view of the pressure surface of the piston part, showing the groove part having a concentric shape, and the right drawing is a side view of the pressure surface of the piston part, showing the groove part having a concentric shape.

[0043] Fig. 6 is a front view of the pressure surface of the piston part of the pressurized pressure plate of the machine tool according to the present invention, showing a drawing in which the groove part is circular.

[0044] Fig. 7 is a front view of the pressure surface of the piston part of the pressurized pressure plate of the machine tool according to the present invention, showing a drawing in which the groove part is in a square shape.

[0045] Fig. 8 is a front view of the pressure surface of the piston part of the pressurized pressure plate of the machine tool according to the present invention, showing a drawing in which the groove part has an oval shape.

[0046] Hereinafter, a detailed description will be given of a tailstock of a machine tool according to an embodiment of the present invention with reference to drawings. The embodiments introduced below are provided as examples to ensure that those skilled in the art can sufficiently convey the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below and may be embodied in other forms. In addition, in the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numbers represent like elements throughout the specification.

[0047] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of description.

[0048] The terminology used herein is for the purpose of describing embodiments and is therefore not intended to be limiting of the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise. As used herein, the terms "comprise" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, operations, and / or elements mentioned.

[0049] Fig. 1 shows a side cross-sectional view of the quill portion of the tailstock of the machine tool according to the present invention in a forward state. Fig. 2 shows a side cross-sectional view of the quill portion of the tailstock of the machine tool according to the present invention in a state immediately before returning to the origin.

[0050] Fig. 3 is a side cross-sectional view of the quill of the tailstock of the machine tool according to the present invention when it has returned to its origin. Fig. 4 (a) is a drawing showing the flow direction in which pressure flows out through the forward passage when the groove portion is not formed when the quill portion returns to its origin, and (b) is a drawing showing the appearance of a vortex formed when pressure flows out through the forward passage when the groove portion is formed when the quill portion returns to its origin.

[0051] The left drawing of Fig. 5 is a front view of the pressure surface of the piston part, showing the groove part having a concentric shape, and the right drawing is a side view of the pressure surface of the piston part, showing the groove part having a concentric shape.

[0052] Fig. 6 is a front view of the pressure surface of the piston portion of the tailstock of the machine tool according to the present invention, showing a drawing in which the groove portion is circular. Fig. 7 is a front view of the pressure surface of the piston portion of the tailstock of the machine tool according to the present invention, showing a drawing in which the groove portion is rectangular.

[0053] Fig. 8 is a front view of the pressure surface of the piston part of the pressurized pressure plate of the machine tool according to the present invention, showing a drawing in which the groove part has an oval shape.

[0054] The definitions of terms used below are as follows. “Axial” means the axial direction in which the quill moves in a straight line (i.e., the X direction in Fig. 1), and “radial” means the direction in which the quill expands radially in the axial direction (i.e., the R direction in Fig. 1).

[0055] Referring to FIGS. 1 to 8, a pressure plate (1) of a machine tool according to the present invention is described. As illustrated in FIGS. 1 to 8, the pressure plate (1) of a machine tool according to the present invention includes a housing portion (100), a piston portion (200), a quill portion (300), a forward passage portion (400), a return passage portion (500), and a groove portion (600).

[0056] The tailstock (1) of the machine tool according to the present invention is intended to fix and support the free end of a workpiece. Specifically, one side of a relatively long workpiece is clamped and fixed to a chuck (not shown in the drawing), and the other free end of the workpiece is supported by the tailstock. This prevents the workpiece from sagging or buckling during machining, thereby improving machining quality and maximizing machining precision.

[0057] The housing part (100) of the pressure plate (1) of the machine tool according to the present invention forms the outer shape of the pressure plate (1) and serves to protect the piston part (200), quill part (300), forward passage part (400), return passage part (500), and groove part (600) arranged inside.

[0058] The piston part (200) of the pressure plate (1) of the machine tool according to the present invention is arranged on one side of the inside of the housing part (100), and a forward passage part (400) and a return passage part (500) are formed so that pressure can be transmitted to the quill part (300).

[0059] The piston part (200) may be provided with a pressure surface (210) at one end of the piston part (200) adjacent to the quill part (300).

[0060] The quill part (300) of the pressure plate (1) of the machine tool according to the present invention is arranged to be able to move linearly and reciprocally with respect to the piston part (200) within the housing part (100) and serves to support the workpiece.

[0061] A live center (not shown in the drawing) is placed at the tip of the quill (300) to support the free end of the workpiece using the live center.

[0062] The forward passage (400) of the pressure plate (1) of the machine tool according to the present invention is formed in the piston section (200) to introduce or discharge pressure for moving the quill section (300) forward.

[0063] The forward flow path (400) has a drain hole (410) formed at the tip, and pressure for moving the quill part (300) forward can flow into or out of the first chamber (710) through the drain hole (410).

[0064] In addition, referring to FIGS. 1 to 3, the forward flow path (400) can be formed in the piston portion (200) to be bent one or more times.

[0065] When the forward flow path (400) is formed by being bent more than once, it becomes convenient to place the drain hole (410) formed at the tip of the forward flow path (400) at the center (211) of the pressurized surface.

[0066] In addition, when the forward flow path (400) is formed to be bent more than once, the pressure at which the pressure flows out in the flow direction (M) through the drain hole (410) from the first chamber (710) can be controlled by controlling the number of times the forward flow path (400) is bent.

[0067] By controlling the pressure that flows out in the flow direction (M) through the drain hole (410) in the first chamber (710), the vortex (V) generated on the pressurized surface can be controlled.

[0068] That is, the more times the forward flow path (400) is bent, the more the pressure flowing through the forward flow path (400) is obstructed, so the pressure flowing out in the flow direction (M) through the drain hole (410) is lowered.

[0069] Meanwhile, the fewer times the forward flow path (400) is bent, the less the pressure flowing through the forward flow path (400) is obstructed, so the pressure flowing out in the flow direction (M) through the drain hole (410) increases.

[0070] Referring to Fig. 1, when the quill part (300) moves forward, pressure is introduced into the forward flow path part (400) and pressure is introduced into the first chamber (710) through the drain hole (410).

[0071] Afterwards, the quill part (300) moves forward by the pressure introduced into the first chamber (710).

[0072] Referring to FIGS. 2 and 3, when the quill part (300) returns to the origin, pressure flows out from the forward flow path part (400), and pressure flows out in the flow direction (M) through the drain hole (410) in the first chamber (710).

[0073] Referring to FIGS. 5 to 8, the drain hole (410) can be placed at the center (211) of the pressurized surface.

[0074] Additionally, although not necessarily limited thereto, the center of the pressure surface (211) and the center of the drain hole (411) may coincide.

[0075] As described above, when pressure is released from the forward flow path (400) to return the quill part (300) to its original position, pressure is released in the flow direction (M) through the drain hole (410) in the first chamber (710).

[0076] If the drain hole (410) is not placed at the center (211) of the pressure surface (210), the flow direction (M) in which pressure flows out is biased to one side from the center (211) of the pressure surface with respect to the pressure surface (210).

[0077] In this way, if the flow direction (M) is biased to one side from the center (211) of the pressurized surface, the vortex (V) generated by the groove portion (600) is not uniformly generated on the pressurized surface (210), and even in a specific part of the pressurized surface (210), the vortex (V) may be generated to a degree insufficient to produce a buffering effect, or there may be a part where the vortex (V) is not generated at all.

[0078] In this way, if the vortex (V) is not uniformly generated on the pressure surface (210), the force that cushions the impact between the quill part and the pressure surface becomes uneven when the quill part returns to the origin, and as described above, in some specific areas, the vortex is insufficient to provide a cushioning effect or a part where the vortex is not generated may occur, so that the impact between the quill part and the pressure surface cannot be properly cushioned, and noise may be generated.

[0079] Accordingly, the pressure plate (2) of the machine tool according to the present invention has a drain hole (410) arranged at the center (211) of the pressure surface (210), so that the flow direction (M) in which pressure flows out through the drain hole (410) is the center (211) of the pressure surface based on the pressure surface (210), thereby allowing a vortex (V) to be uniformly generated on the pressure surface (210).

[0080] In this way, by uniformly generating a vortex (V) on the pressure surface (210), the impact between the quill part and the pressure surface is sufficiently and uniformly cushioned, thereby allowing the quill part to quickly return to the origin while reducing noise generated by the impact between the quill part and the pressure surface.

[0081] The return path (500) of the pressure plate (1) of the machine tool according to the present invention is formed in the piston part (200) to introduce or release pressure to return the quill part (300) to the origin.

[0082] Referring to Fig. 1, when the quill part (300) moves forward, pressure flows into the forward passage part (400) as described above, and pressure flows out of the return passage part (500).

[0083] Referring to FIGS. 2 and 3, when the quill part (300) returns to the origin, as described above, pressure flows out from the forward passage part (400), and pressure flows out from the return passage part (500) and flows into the second chamber (720).

[0084] Afterwards, the quill part (300) is moved back to the origin by the pressure introduced into the second chamber (720).

[0085] The groove portion (600) of the pressure plate (1) of the machine tool according to the present invention can be formed on one end of the pressure surface (210) of the piston portion (200) adjacent to the quill portion (300).

[0086] The pressure plate (1) of the machine tool according to the present invention can buffer the impact between the quill part (300) and the pressure surface (210) by generating a vortex (V) through the groove part (600) when the pressure is discharged through the forward passage part (400) while the quill part (300) moves in a direction adjacent to the pressure surface (210) to return the quill part (300) to the origin.

[0087] In this way, the tailstock of the machine tool according to the present invention generates a vortex through a groove formed on a pressure surface of one end of the piston portion when the quill portion returns to the origin, thereby cushioning the impact between the quill portion and the pressure surface, thereby enabling the quill portion to quickly return to the origin while reducing noise caused by the impact between the quill portion and the pressure surface.

[0088] In addition, since the tailstock of the machine tool according to the present invention does not require a separate speed control valve to be installed as in the past, the cost for installing the speed control valve can be omitted, thereby reducing the manufacturing cost of the tailstock.

[0089] Moreover, since the tailstock of the machine tool according to the present invention is equipped with a separate speed adjustment valve as in the prior art, the speed adjustment valve is fixed by finding a condition in which the noise is not excessive and the return to the origin (reverse) speed of the quill part is not too slow, so that no additional assembly time is required for speed adjustment valve adjustment, and thus the speed adjustment valve assembly time can be reduced.

[0090] Referring to FIG. 5, the groove portion (600) can be formed so as to be in the tangential direction (TT) of the flow direction (M) of the pressure flowing out through the forward flow path portion (400).

[0091] In this way, when the groove portion (600) is formed so as to be in the tangential direction (TT) of the pressure flow direction (M), the pressure flow flowing out through the forward flow path (400) along the flow direction (M) is effectively obstructed, thereby most efficiently generating a vortex (V) through the groove portion (600).

[0092] Referring to FIG. 5, the groove portion (600) can be formed in a plurality of concentric circles based on the center (411) of the drain hole.

[0093] In this way, when the groove portion (600) is formed in a plurality of concentric circles based on the center (411) of the drain hole, a vortex (V) can be generated uniformly throughout the entire pressure surface (210) compared to when there is only one groove portion (600).

[0094] And, the interval (d) between the plurality of concentric circles can be formed to be 0.1 times or more and 0.3 times or less of the diameter (D) of the pressurizing portion.

[0095] If the interval (d) between multiple concentric circles is formed to be less than 0.1 times the diameter (D) of the pressurizing portion, too many concentric circles are arranged on the pressurizing surface (210), resulting in too many vortices (V) being generated on the pressurizing surface (210).

[0096] In this way, if the vortex (V) generated on the pressure surface (210) becomes too large, the vortices (V) cancel each other out and cannot sufficiently cushion the impact between the quill part (300) and the pressure surface (210), resulting in a problem in that the noise generated by the impact between the quill part and the pressure surface cannot be reduced.

[0097] Meanwhile, if the interval (d) between multiple concentric circles is formed to be more than 0.3 times the diameter (D) of the pressurizing portion, the concentric circles are arranged too few on the pressurizing surface (210), so that the vortex (V) generated on the pressurizing surface (210) is reduced.

[0098] In this way, if the eddy current (V) generated on the pressure surface (210) becomes too small, the impact between the quill part (300) and the pressure surface (210) cannot be sufficiently cushioned, and thus a problem occurs in that noise generated by the impact between the quill part and the pressure surface cannot be reduced.

[0099] Preferably, the interval (d) between the plurality of concentric circles can be formed to be 0.2 times the diameter (D) of the pressurizing portion.

[0100] In this way, when the spacing (d) between multiple concentric circles is 0.2 times the diameter (D) of the pressurizing portion, the pressure flow flowing out through the forward flow path (400) is effectively obstructed, and a vortex (V) is most efficiently generated through the groove portion (600) formed on the pressurizing surface (210), so that the quill portion can quickly return to the starting point, while reducing the noise generated by the impact between the quill portion and the pressurizing surface.

[0101] Referring to Fig. 6, the groove portion (600) may be formed in multiple pieces with a circular cross-sectional shape.

[0102] The above groove portion (600) may be formed by being recessed into the pressure surface (210) in a circular cross-section, or may be formed by being protruded into the pressure surface (210) in a circular cross-section.

[0103] In addition, the groove portion (600) may be uniformly formed in a plurality of circular cross-sections on the pressing surface (210) and spaced apart at regular intervals on the pressing surface (210), or may be formed unevenly and spaced apart at regular intervals on the pressing surface (210) as needed.

[0104] Referring to Fig. 7, the groove portion (600) may be formed in multiple pieces with a rectangular cross-sectional shape.

[0105] The above groove portion (600) may be formed by being recessed into the pressure surface (210) in a rectangular cross-section, or may be formed by being protruded into the pressure surface (210) in a rectangular cross-section.

[0106] In addition, the groove portion (600) may be uniformly formed in multiple pieces with a rectangular cross-section on the pressing surface (210) and spaced apart at regular intervals on the pressing surface (210), or may be formed unevenly and spaced apart at regular intervals on the pressing surface (210) as needed.

[0107] Referring to Fig. 8, the groove portion (600) may be formed in multiple pieces with an oval cross-sectional shape.

[0108] The groove portion (600) above may be formed by being recessed into the pressure surface (210) in a cross-sectional shape of an ellipse, or may be formed by being protruded into the pressure surface (210) in a cross-sectional shape of an ellipse.

[0109] In addition, the groove portion (600) may be uniformly formed in a plurality of oval cross-sections on the pressing surface (210) at regular intervals, or may be formed unevenly at regular intervals on the pressing surface (210) as needed.

[0110] In this way, the tailstock of the machine tool according to the present invention generates a vortex through the groove when the quill returns to the origin, and the cross-sectional shape of the groove is formed in various shapes such as circular, square, and oval, so that the impact between the quill and the pressurized surface is cushioned through the groove, allowing the quill to quickly return to the origin, thereby shortening the machining cycle time and maximizing productivity.

[0111] Although the detailed description of the present invention described above has been described with reference to preferred embodiments of the present invention, it will be understood by those skilled in the art or having ordinary knowledge in the art that various modifications and changes can be made to the present invention without departing from the spirit and technical scope of the present invention as set forth in the claims below. Accordingly, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

[0112] <Explanation of symbols>

[0113] 100: Housing Department,

[0114] 200: piston section,

[0115] 300: Quill,

[0116] 400: Forward Euro,

[0117] 500: Return to Eurozone,

[0118] 600: Groove section

Claims

1. Housing Department; A piston part arranged on one side of the inside of the housing part; A quill part that supports a workpiece and is arranged to be able to move linearly and reciprocally relative to the piston part inside the housing part; A forward passage formed in the piston section to provide a drain hole and to introduce or discharge pressure for moving the quill section forward; A return path formed in the piston part to introduce or discharge pressure to return the quill part to its original position; and A pressurized seat of a machine tool, characterized by including a groove formed on a pressure surface of one end of the piston portion adjacent to the quill portion.

2. In paragraph 1, A tailstock of a machine tool, characterized in that when the quill part moves in a direction adjacent to the pressure surface to return the quill part to the origin and pressure flows out through the forward passage part, a vortex is generated through the groove part to cushion the impact between the quill part and the pressure surface.

3. In paragraph 2, A tailstock of a machine tool, characterized in that the drain hole is arranged at the center of the pressurized surface.

4. In paragraph 3, A pressure plate of a machine tool, characterized in that the groove portion is formed so as to be in a tangential direction to the flow direction of pressure flowing out through the forward passage portion.

5. In paragraph 4, A tailstock of a machine tool, characterized in that the groove portion is formed in a plurality of concentric circles based on the center of the drain hole.

6. In paragraph 5, A machine tool's tailstock, characterized in that the spacing between the plurality of concentric circles is formed to be 0.1 to 0.3 times the diameter of the pressurizing portion.

7. In paragraph 4, A tailstock of a machine tool, characterized in that the groove portion is formed in a plurality of circular cross-sectional shapes.

8. In paragraph 4, A tailstock of a machine tool, characterized in that the groove portion is formed in multiple pieces with a rectangular cross-sectional shape.

9. In paragraph 4, A tailstock of a machine tool, characterized in that the groove portion is formed in a plurality of oval cross-sectional shapes.

10. In paragraph 3, A tailstock of a machine tool, characterized in that the above forward passage portion is formed in the piston portion to be bent at least once.

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