KR102299149B1 - Machine tools of multi point clamping type - Google Patents

Abstract

The present invention provides a clamping device for clamping a shaft of a machine tool. More particularly, according to the present invention, a plurality of input grooves are formed in the circumferential direction on an outer surface of the clamping ring for clamping a shaft to fill with hydraulic pressure, and the hydraulic pressure is applied to each of the input grooves to clamp the shaft to enable uniform clamping, thereby maintaining the centering of the shaft.

Description

Machine tool with multi-point clamping method {MACHINE TOOLS OF MULTI POINT CLAMPING TYPE}

The present invention relates to a clamping device for clamping a shaft of a machine tool. In particular, a plurality of clamping rings are formed in the circumferential direction on the outer surface of a clamping ring for clamping the shaft to form input grooves filled with hydraulic pressure, and hydraulic pressure is applied to the input grooves, respectively. By inputting it to clamp the shaft, uniform clamping is possible and the centering of the shaft can be maintained.

In general, the machine tool 1 is provided at the upper end of the shaft (S) and the shaft (S) rotated by the drive unit (M) for generating a rotational force as shown in Figure 1, the drive unit (M) rotates It includes a table T. The processing object W is loaded and fixed on the table T, and the processing tool TL enters the processing object W to process. At this time, there is a case where the processing object W is rotated and processed while the processing tool TL is stopped. ) while rotating, the object W may be processed.

At this time, the table (T) and the shaft (S) must be maintained in a stopped state in order to maintain the processing object (W) in a stopped state. For this purpose, a clamping ring (CR) is conventionally used. The clamping ring CR has a ring shape, has a shape surrounding the shaft S, and has an input groove CR1 formed in the center, so that hydraulic pressure is applied to the input groove CR1. The clamping ring CR expands by the input hydraulic pressure and comes into contact with the shaft S, thereby maintaining the shaft S in a stopped state.

However, in the case of the above-described prior art, since hydraulic pressure is applied to all parts in the circumferential direction of the clamping ring CR, the hydraulic pressure may be different for each point of the clamping ring CR, and for this reason, uniform clamping is difficult. In addition, since uniform clamping is difficult, the force applied to the shaft is not uniform, so it is difficult for the shaft to maintain centering.

On the other hand, the above-described clamping ring itself is widely known and is particularly described in detail in the following prior art documents, and a description and illustration thereof will be omitted.

Japanese Registered Patent No. 4731665 Korean Patent Publication No. 10-2017-0111577 US Registered Patent No. 10427262

The present invention is to solve the above-described problem, a plurality of input grooves are formed in the circumferential direction on the outer surface of a clamping ring for clamping the shaft to fill hydraulic pressure, and hydraulic pressure is applied to the input grooves to lock the shaft. An object of the present invention is to provide a clamping device for a machine tool capable of uniform clamping by clamping and maintaining centering of a shaft.

However, the object of the present invention is not limited to the above-mentioned object, and another object not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the present invention provides a table (T) on which a processing object is seated, a shaft (300) rotating the table (T), and a clamping ring (100) for clamping the shaft (300) and a hydraulic pressure providing means (O) for providing hydraulic pressure to the clamping ring 100, and a main body 200 in which the shaft 300 is accommodated, wherein the clamping ring 100 includes the shaft 300 A ring-shaped ring body 110 accommodated therein, is formed on the outer surface of the ring body 110, is formed in a plurality spaced apart in the circumferential direction, and is recessed in the thickness direction of the ring body 110 to fill the hydraulic pressure Multi-point clamping for clamping the shaft 300 by contacting the shaft 300 and deforming the ring body 110 by applying hydraulic pressure to each of the input grooves 120 , respectively. provides machine tools.

In the above, the clamping body 110 is a ring shape having a rectangular cross section, and has an upper horizontal portion 111 disposed in a horizontal direction on the upper portion of the input groove 120 , and a horizontal portion on the lower portion of the input groove 120 . a lower horizontal portion 112 disposed in the direction, and a vertical connecting portion 113 connecting the upper horizontal portion 111 and the lower horizontal portion 112 in a vertical direction and in contact with the shaft 300 , the vertical A plurality of first folded parts 123 are formed on the side in the direction of the shaft 300 of the connection parts 113 in the height direction, and a plurality of the vertical connection parts 113 are formed on the side opposite to the shaft 300 in the height direction. Each of the second folded parts 130 is formed, and hydraulic pressure is applied to the input groove 120 so that the vertical connection part 113 protrudes and expands in the shaft 300 direction. ) and the second folded portion 130 are unfolded.

In the above, the first folded portion 123 and the second folded portion 130 are formed as a groove.

In the above, the first folded part 123 includes a 21st inclined surface 121 and a 22nd inclined surface 122 that form a mutually specific angle and meet at a point, and the second folded part 130 is a mutually specific It includes a 31st inclined surface 131 and a 32nd inclined surface 132 that form an angle and meet at a point, wherein the 21st inclined surface 121 is disposed to be inclined upward toward the shaft 300, and the 22nd inclined surface 122 is disposed to be inclined downward toward the shaft 300, the 31st inclined surface 131 is inclined downward toward the shaft 300, and the 32nd inclined surface 132 is the shaft ( 300), a first deformation inducing part 114 that is inclined upward and is recessed at the intersection of the upper horizontal part 111 and the vertical connection part 113, and the lower horizontal part 111 and the vertical connection part A second deformation inducing part 115 recessed at the intersection point of 113 is formed, respectively, and the first deformation inducing part 114 includes a pair of induction part inclined surfaces 114-1 and 114-2 made of straight lines parallel to each other; It consists of a connection surface 114-3 connecting the induction slopes, the guide slopes 114-1 and 114-2 are parallel to the 21st slope 121, and the second deformation induction part 115 is parallel to each other. It consists of a pair of induction part inclined surfaces 115-1 and 115-2 made of a straight line and a connecting surface 115-3 connecting the induction inclined surfaces, and the induction inclined surfaces 115-1 and 115-2 are the 22nd inclined surfaces. It is formed parallel to (122).

In the above, the main body 200 includes a hollow main body body 210 and an opening 240 formed on the upper surface of the main body body 210, and the main body body 210 is inside the A driving unit M for generating a rotational force is provided, a shaft 300 is disposed on the driving unit M, and the shaft 300 includes a first shaft 310 disposed on the driving unit M, and the A second shaft 320 disposed on the first shaft 310, passing through the opening 240, and in contact with the clamping ring 100, and disposed on the second shaft 320, the table T ) includes a third shaft 330 supporting the lower side.

In the above, the main body body 210 has a vertical side 211 formed in a vertical direction on one side of the opening 240 and a horizontal direction at the top of the vertical side 211, and the opening portion (240) a flat surface 212 formed in an outward direction, a flow path 220 for supplying hydraulic pressure to the clamping ring 100 is formed inside the main body body 210, the main body body A mounting protrusion 230 for arranging the sealing member SL is formed on the upper surface of the 210 , and the mounting protrusion 230 is a first mounting protrusion 231 protruding upward from the end of the flat surface 212 . and a second mounting protrusion 232 formed to be spaced apart from the first mounting protrusion 231 by a predetermined interval, wherein the sealing member SL includes a first sealing member SL1 and a second sealing member SL2. , wherein the first sealing member SL1 is disposed between the first mounting protrusion 231 and the second mounting protrusion 232 , and the second sealing member SL2 includes the second mounting protrusion 232 . ), the upper horizontal portion 111 of the clamping ring 100 is formed to be longer than the lower horizontal portion 112 and protrudes toward the main body 200, and the upper horizontal portion A protrusion 116 protrudes downward from the lower side of the 111 , the horizontal length of the protrusion 116 is formed to be the same as that of the lower protrusion 112 , and the upper horizontal part 111 is the flat surface 212 . and the first mounting protrusion 231 so that upper surfaces of the upper horizontal part 111 and the first mounting protrusion 231 have the same height, and the end side of the protrusion 116 and the lower protrusion 112 is vertical The input groove 120 of the clamping ring 100 in close contact with the side 211 faces the vertical side 211 , and the flow path 220 is formed inside the main body body 210 , and the vertical It extends to the side 211 and communicates with the input groove 120 .

In the above, the table T is disposed on the upper surface of the third shaft 330 , and a part of the lower surface of the third shaft 330 is a mounting protrusion 230 formed on the upper surface of the main body body 210 . The upper surface, the upper surface of the upper horizontal portion 111 of the clamping ring 100, and the upper surface of the sealing member SL installed on the mounting protrusion 230 is in contact.

The features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings.

Prior to this, the terms or words used in the present specification and claims should not be construed in a conventional and dictionary meaning, and the inventor may properly define the concept of the term to describe his invention in the best way. Based on the principle that there is, it should be interpreted as meaning and concept consistent with the technical idea of the present invention.

According to the present invention described above, there is an effect that enables uniform clamping and maintains the centering of the shaft.

1 is a schematic diagram illustrating a typical clamping ring;
2 and 3 are a perspective view and a plan view of a clamping ring according to an embodiment of the present invention;
4 is a cross-sectional view of a clamping ring according to an embodiment of the present invention;
5 is a cross-sectional perspective view of a machine tool according to an embodiment of the present invention;
6 and 7 are partial perspective views showing the coupling relationship in which the clamping ring is mounted to the main body according to an embodiment of the present invention;
8 is a partial cross-sectional view illustrating a shaft of a confucian mechanical device according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

In addition, the following embodiments do not limit the scope of the present invention, but are merely exemplary of the elements presented in the claims of the present invention, and are included in the technical spirit throughout the specification of the present invention and constitute the scope of the claims Embodiments including substitutable elements as equivalents in elements may be included in the scope of the present invention.

The machine tool 10 according to an embodiment of the present invention includes a table T on which a processing object is seated, a shaft 300 rotating the table T as shown in FIGS. 2 to 7, and the It includes a clamping ring 100 for clamping the shaft 300 , hydraulic pressure providing means O for providing hydraulic pressure to the clamping ring 100 , and a main body 200 in which the shaft 300 is accommodated. . That is, when the shaft 300 is rotated by the driving unit M as described above, the table T is interlocked and rotates, thereby rotating the object to be processed. If the object to be processed is machined in a stationary state, the clamping ring 100 clamps the shaft 300 to maintain the shaft 300 in a stationary state. The hydraulic pressure providing means O may provide a predetermined hydraulic pressure by compressing oil using a general pump or the like, and since this is a well-known configuration, detailed description and illustration thereof will be omitted.

The clamping ring 100 includes a ring-shaped ring body 110 in which the shaft 300 is accommodated, and a plurality of rings formed on the outer surface of the ring body 110 and spaced apart from each other in the circumferential direction. It includes an input groove 120 that is recessed in the thickness direction of the body 110 and is filled with hydraulic pressure. That is, in the case of the embodiment shown in FIG. 3 , four input grooves 120 are formed in the circumferential direction of the ring body 110 . These input grooves 120 are spaced apart from each other at regular intervals. Hydraulic pressure is applied to each of these input grooves 120 to deform the ring body 110 , and to contact the shaft 300 to clamp the shaft 300 .

In other words, in the clamping ring 100 of the present invention, a plurality of input grooves 120 are formed, and hydraulic pressure is applied to the input grooves 120 , respectively. Therefore, the hydraulic pressure input to the input groove 120 can be made uniform and the force applied to the shaft can also be made uniform by this, so that the centering of the shaft can be maintained.

The clamping body 110 of the clamping ring 100 has a ring shape having a rectangular cross section as shown in FIG. 4, and an upper horizontal portion 111 disposed in the horizontal direction on the upper portion of the input groove 120, A lower horizontal portion 112 disposed in a horizontal direction at a lower portion of the input groove 120 and a vertical connection between the upper horizontal portion 111 and the lower horizontal portion 112 in a vertical direction and in contact with the shaft 300 It includes a connection part 113 . That is, the space consisting of the upper horizontal part 111 , the lower horizontal part 112 , and the vertical connection part 113 is formed as the input groove 120 . At this time, when hydraulic pressure is applied to the input groove 120 , the vertical connection part 113 expands in the shaft direction (right direction in the drawing). The expanded vertical connection 113 contacts the shaft and clamps the shaft.

At this time, a plurality of first folded parts 123 formed on the side in the direction of the shaft 300 of the vertical connection parts 113 in the height direction, and the side of the vertical connection parts 113 in the opposite direction to the shaft 300 in the height direction A plurality of second folded portions 130 are formed, respectively. When hydraulic pressure is applied to the input groove 120 by the first folded part 123 and the second folded part 130 and the vertical connection part 113 protrudes and expands in the shaft 300 direction, the first The folded part 123 and the second folded part 130 are unfolded, so that the vertical connection part 113 expands in a more uniform state. That is, in the absence of the first folded part 123 and the second folded part 130 , the central part of the vertical connection part 113 expands the most and the upper and lower parts expand relatively less, so that the vertical connection part 113 and the shaft There is a possibility that the contact area of the In order to dispel these concerns, the folds 120 and 130 are included. When the vertical connection part 113 is expanded, the length of the vertical connection part 113 increases. Accordingly, the vertical connection part 113 may be expanded more uniformly as a whole. With this configuration, the contact area between the vertical connection part 113 and the shaft may be increased, thereby improving clamping efficiency.

Meanwhile, the first folded part 123 and the second folded part 130 may be formed as grooves recessed in a specific shape.

In addition, the first folded part 123 includes a 21st inclined surface 121 and a 22nd inclined surface 122 that form a mutually specific angle and meet at a point, and the second folded part 130 has a mutually specific angle. It may include a 31st inclined surface 131 and a 32nd inclined surface 132 which form and meet at a point. That is, the first point pressing portion 120 and the second folding portion 130 may have a v-shape.

At this time, the 21st inclined surface 121 is disposed to be inclined upward toward the shaft 300 , and the 22nd inclined surface 122 is disposed to be inclined downward toward the shaft 300 . In addition, the 31st inclined surface 131 is disposed to be inclined downward toward the shaft 300 , and the 32nd inclined surface 132 is disposed to be inclined upward toward the shaft 300 .

On the other hand, the first deformation inducing part 114 recessed at the intersection of the upper horizontal part 111 and the vertical connection part 113 so that the vertical connection part 113 can more easily expand, and the lower horizontal part 111 . ) and a second deformation inducing part 115 recessed at the intersection of the vertical connection part 113 may be included. That is, the vertical connection part 113 expands by the input hydraulic pressure as described above. At this time, a groove is formed at the connection point of the upper horizontal part 111 and the lower horizontal part 112 so that the vertical connection part 113 can more easily expand.

The first deformation inducing part 114 may include a pair of induction part inclined surfaces 114-1 and 114-2 formed of straight lines parallel to each other, and a connecting surface 114-3 connecting the inducing inclined surfaces. In this case, the guide inclined surfaces 114 - 1 and 114 - 2 may be formed parallel to the twenty-first inclined surface 121 . That is, the shaft 300 is formed to be inclined upward in the direction of the shaft 300 .

Similarly, in the case of the second deformation induction part 115, it consists of a pair of induction part inclined surfaces 115-1 and 115-2 made of straight lines parallel to each other, and a connection surface 115-3 connecting the induction inclined surfaces, The guide inclined surfaces 115 - 1 and 115 - 2 may be formed parallel to the 22nd inclined surface 122 .

4 to 8 , the main body 200 may include a hollow main body body 210 and an opening 240 formed on an upper surface of the main body body 210 . A driving unit M for generating a rotational force may be provided inside the main body body 210 . The driving unit M may use a well-known electric motor or the like. A shaft 300 is disposed on the driving unit M, and a table T is disposed on the shaft 300. By this configuration, the shaft 300 is rotated by the driving unit M, whereby the table T is rotated.

On the other hand, the shaft 300 includes a first shaft 310 disposed on the driving part M, a first shaft 310 disposed on the first shaft 310 and passing through the opening 240, and the clamping ring ( It may include a second shaft 320 in contact with 100 , and a third shaft 330 disposed on the second shaft 320 and supporting the table T from the lower side. That is, the first shaft 310 is disposed inside the main body body 210 , and the second shaft 320 is disposed on the first shaft 310 and passes through the opening 240 . At this time, the clamping ring 100 comes into contact with the second shaft 320 . The third shaft 320 is disposed on the second shaft 320 and contacts the lower side of the table T to support the table T.

The main body body 210 has a vertical side 211 formed in a vertical direction on one side of the opening 240 and a horizontal side formed at an upper end of the vertical side 211, an opening 240 . It may include a flat surface 212 formed in an outward direction.

In addition, a flow path 220 for supplying hydraulic pressure to the clamping ring 100 is formed inside the main body body 210 and may communicate with the hydraulic pressure supply means (O, see FIG. 2 ) described above.

In addition, a mounting protrusion 230 for disposing the sealing member SL may be formed on the upper surface of the main body body 210 . The mounting protrusion 230 includes a first mounting protrusion 231 protruding upward from the end of the flat surface 212 and a second mounting protrusion 232 formed to be spaced apart from the first mounting protrusion 231 by a predetermined distance. may include. In this case, the sealing member SL includes a first sealing member SL1 and a second sealing member SL2, and the first sealing member SL1 includes the first mounting protrusion 231 and the second mounting protrusion. 232 , and the second sealing member SL2 is disposed on an outer surface of the second mounting protrusion 232 .

As described above, when the object to be processed is processed on the table T, the cutting powder may be discharged, so that the cutting powder may enter the main body 200 . To prevent this, the sealing member SL is used. The sealing member SL may use a well-known rib method.

The upper horizontal portion 111 of the clamping ring 100 is formed to be longer than the lower horizontal portion 112 and protrudes toward the main body 200 . In addition, a protrusion 116 protrudes downward from the lower side of the upper horizontal portion 111 , and the horizontal length of the protrusion 116 is formed to be the same as that of the lower protrusion 112 . In this case, the upper horizontal part 111 is in close contact with the flat surface 212 and the first mounting protrusion 231 , so that the upper surfaces of the upper horizontal part 111 and the first mounting protrusion 231 have the same height. That is, the front end surface of the upper horizontal part 111 is in close contact with the side surface of the first mounting protrusion 231 , and the lower surface of the upper horizontal part 111 is in close contact with the flat surface 212 . In this case, end sides of the protrusion 116 and the lower protrusion 112 are in close contact with the vertical side surface 211 so that the input groove 120 of the clamping ring 100 faces the vertical side surface 211 . In addition, the flow path 220 is formed inside the main body body 210 , extends to the vertical side surface 211 and communicates with the input groove 120 . In other words, the flow path 220 may be formed in a horizontal direction inside the main body body 210 , and the flow path 220 extends to the vertical side 221 , so that hydraulic pressure flows through the flow path 220 into the input groove ( 120) can be used.

Meanwhile, a table T is disposed on the upper surface of the third shaft 330 . Some of the lower surfaces of the third shaft 330 include the upper surface of the mounting protrusion 230 formed on the upper surface of the main body body 210 , the upper surface of the upper horizontal portion 111 of the clamping ring 100 , and the mounting protrusion. It is in contact with the upper surface of the sealing member SL installed on the 230 . That is, a sealing member SL is mounted on the mounting protrusion 230 , and the lower surface of the third shaft 330 presses the sealing member SL to stably fix the sealing member SL. .

Although the present invention has been described in detail through specific examples, this is intended to describe the present invention in detail, and the present invention is not limited thereto, and by those of ordinary skill in the art within the technical spirit of the present invention. It is clear that the modification or improvement is possible.

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific protection scope of the present invention will be clarified by the appended claims.

100: clamping ring 110: ring body
120: input groove 200: main body
210: main body body 220: euro
230: mounting protrusion 300: shaft
310: first shaft 320: second shaft
330: third shaft

Claims (5)

A table (T) on which an object to be processed is seated, a shaft (300) rotating the table (T), a clamping ring (100) for clamping the shaft (300), and hydraulic pressure are applied to the clamping ring (100) It includes a hydraulic pressure providing means (O) to provide, and a main body (200) in which the shaft (300) is accommodated,
The clamping ring 100 includes a ring-shaped ring body 110 in which the shaft 300 is accommodated, and a plurality of rings formed on an outer surface of the ring body 110 and spaced apart in the circumferential direction. It includes an input groove 120 that is recessed in the thickness direction of the body 110 and is filled with hydraulic pressure,
Hydraulic pressure is applied to each of the input grooves 120 to deform the ring body 110 , and to contact the shaft 300 to clamp the shaft 300 .
The clamping body 110 is a ring shape having a rectangular cross section, and the upper horizontal portion 111 is horizontally disposed on the upper portion of the input groove 120 , and is horizontally disposed on the lower portion of the input groove 120 . and a lower horizontal part 112 to be formed, and a vertical connection part 113 connecting the upper horizontal part 111 and the lower horizontal part 112 in a vertical direction and in contact with the shaft 300,
Among the vertical connection parts 113 , a plurality of first folded parts 123 are formed on the side in the shaft 300 direction in the height direction, and among the vertical connection parts 113 , a plurality of first fold parts 113 are formed on the side opposite to the shaft 300 in the height direction. The formed second folded portions 130 are respectively formed,
Hydraulic pressure is applied to the input groove 120 so that the vertical connection part 113 protrudes and expands in the shaft 300 direction, and the first folded part 123 and the second folded part 130 are unfolded during the expansion.
The first folded part 123 includes a 21st inclined surface 121 and a 22nd inclined surface 122 that form a mutually specific angle and meet at a point, and the second folded part 130 forms a mutually specific angle. It includes a 31st slope 131 and a 32nd slope 132 that meet at a point,
The twenty-first inclined surface 121 is inclined upwardly toward the shaft 300, and the twenty-second inclined surface 122 is inclined downward toward the shaft 300,
The 31st inclined surface 131 is disposed to be inclined downward toward the shaft 300, and the 32nd inclined surface 132 is disposed to be inclined upward toward the shaft 300,
A first deformation inducing part 114 recessed at the intersection of the upper horizontal part 111 and the vertical connection part 113, and a second deformation recessed at the intersection of the lower horizontal part 111 and the vertical connection part 113 Induction parts 115 are respectively formed,
The first deformation inducing part 114 is composed of a pair of induction part inclined surfaces 114-1 and 114-2 made of straight lines parallel to each other, and a connecting surface 114-3 connecting the inducing inclined surfaces, and the induction inclined surface ( 114-1 and 114-2) are parallel to the 21st inclined surface 121,
The second deformation guiding part 115 is composed of a pair of guiding part inclined surfaces 115-1 and 115-2 formed of straight lines parallel to each other, and a connecting surface 115-3 connecting the guiding inclined surfaces, and the guiding inclined surface ( 115-1, 115-2) is a multi-point clamping type machine tool that is formed parallel to the 22nd inclined surface 122. delete According to claim 1,
The first folded portion 123 and the second folded portion 130 is a multi-point clamping type machine tool formed with a groove. delete According to claim 1,
The main body 200 includes a hollow main body body 210 and an opening 240 formed on the upper surface of the main body body 210,
A driving unit M for generating a rotational force is provided inside the main body body 210,
A shaft 300 is disposed on the driving unit M,
The shaft 300 includes a first shaft 310 disposed on the driving part M, a first shaft 310 disposed on the first shaft 310 and passing through the opening 240 , and the clamping ring 100 . A multi-point clamping type machine tool including a second shaft 320 in contact with the second shaft 320 and a third shaft 330 disposed on the second shaft 320 and supporting the table T from the lower side.

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