KR101050491B1

KR101050491B1 - Hydraulic chuck

Info

Publication number: KR101050491B1
Application number: KR1020100138434A
Authority: KR
Inventors: 심낙서
Original assignee: 심낙서
Priority date: 2010-12-30
Filing date: 2010-12-30
Publication date: 2011-07-20

Abstract

PURPOSE: A hydraulic chuck is provided to prevent damage to workpiece by operating a plurality of jaws with time difference. CONSTITUTION: A slider part(400) comprises a main slider and a plurality of secondary sliders. The main slider is lifted and moved within a sleeve. A plurality of secondary sliders and the main slider are lifted and moved with time difference. A moving force conveying part(500) changes the elevating movement force of the slider part into the horizontal moving force. The moving force conveying part transfers the transformed horizontal moving force to each jaw. The fluid pressure offer part selectively offers the hydraulic pressure force to the inner top and bottom spaces of the sleeve so that the slider part can be lifted and moved within the sleeve.

Description

Hydraulic chuck

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic chuck for fixing a workpiece, and more particularly, to improve the operation structure of a plurality of jaws constituting the hydraulic chuck, thereby holding the workpiece regardless of the origin of the workpiece. It relates to a new type of hydraulic chuck to make it more stable.

The chuck is generally used in a lathe, a milling machine, or a machine tool such as a machining center, and uses a plurality of jaws to hold the workpiece to prevent the workpiece from flowing during processing of the workpiece. It plays a role.

The chuck as described above may be classified into a manual chuck and an automatic chuck according to a method of operating a plurality of jaws.

Here, the manual chuck is a manner in which the operator moves the jaws in the radial direction of the chuck housing by manual operation to grip the workpiece, and the automatic chuck chucks the jaws by providing a driving force by electrical control. This is a method of holding the workpiece by moving in the radial direction.

At this time, the manual chuck is a hydraulic chuck is mainly used due to the inconvenience of the operation and difficulty in accurately matching the concentric circle between the workpiece and the chuck housing.

The hydraulic chuck is advantageous in that a stable and strong gripping force can be obtained by providing hydraulic pressure to move each jaw.

However, the above-described conventional hydraulic chuck is configured to hold the workpiece while each of the jaws are moved at the same time by hydraulic pressure, so that all the jaws at the same time accurately correct the outer circumferential surface of the workpiece when the workpiece is not a circle. Some of the jaws, rather than gripping, have a problem that could not hold the workpiece.

Accordingly, undesired flow may occur due to the centrifugal force or cutting resistance of the workpiece during the machining of the workpiece, thereby making it difficult to precisely process the workpiece. There is a problem that has occurred up to a phenomenon that deviates from.

In particular, the larger the diameter of the workpiece has a problem that the more problems described above are inevitably generated because more jaw is required.

The present invention has been made to solve the various problems according to the prior art described above, the object of the present invention is to allow a simple structure while the operation for a plurality of jaws can be made differently with a time difference. It is to provide a new type of hydraulic chuck.

According to the hydraulic chuck of the present invention for achieving the above object to form an outer body, the outer surface of the chuck housing is formed with a plurality of sliding grooves in the radial direction; A plurality of jaws respectively seated in the sliding grooves and holding the workpiece while slidingly moved under the guidance of the sliding grooves; A sleeve provided at a central side of the chuck housing, the upper and lower ends of which are formed in a cylindrical shape closed by a cover, and a plurality of through holes formed in a circumferential surface thereof; A slider unit comprising a main slider that is moved up and down in the sleeve and a plurality of auxiliary sliders that are moved up and down with a time difference from the main slider; A moving force transmitting unit converting the lifting movement force of the slider unit into horizontal moving force and transmitting the horizontal moving force to each jaw; And a hydraulic pressure providing unit for selectively providing hydraulic pressure to an upper space and a lower space in the sleeve so that the slider can be moved up and down.

Here, the outer circumferential surface of the main slider constituting the slider portion is installed to be moved up and down in contact with the inner circumferential surface of the sleeve, the main slider is formed through a plurality of mounting holes in the axial direction as well as the respective auxiliary sliders Is installed in each mounting hole of the main slider so as to be capable of lifting each.

In addition, the upper and lower heights formed by the respective auxiliary sliders are formed relatively lower than the height of the mounting holes formed in the main slider, so that the hydraulic force provided to the upper space or the lower space in the sleeve has a parallax, and the main slider and the angle And to be provided to the auxiliary slider.

In addition, each of the mounting holes formed in the main slider are formed at positions conformal to each other based on the axis center of the main slider, and the movement force transmitting unit connects the auxiliary sliders and each jaw interlocked thereto. In addition to being provided to each of the outer circumferential surface of the main slider characterized in that the respective jaws are provided so as to be connected between each of the portions where the respective mounting holes are formed.

In addition, the movement force transmission unit is coupled to the bottom of each jaw, respectively, a plurality of movement blocks moving with the jaw, and rotatably installed in the chuck housing while receiving the lifting movement force of the slider unit each movement block It is characterized by consisting of a plurality of levers for horizontally moving.

In addition, the lever is coupled to the rotary end rotatably installed in the chuck housing and the side wall of the main slider or the auxiliary slider through the through hole of the sleeve while being protruded on the circumferential surface of the rotary end And a block coupling end configured to protrude into a portion perpendicular to the portion where the slider coupling end is formed among the peripheral surfaces of the rotary end, to be concave and coupled to the moving block.

The hydraulic chuck according to the present invention as described above centers the work piece while some jaws are preferentially operated, and the rest of the work pieces are stable as the rest of the jaws are gripped by the work pieces while operating with parallax. Not only can be made but also has the effect of being able to prevent damage to the workpiece.

In particular, the present invention has an effect that the overall structure can be made simple by configuring the slider portion as a main slider and a plurality of auxiliary sliders and each of the auxiliary sliders are installed in the main slider.

1 is a plan view showing for explaining the upper structure of the hydraulic chuck according to a preferred embodiment of the present invention
FIG. 2 is a cross-sectional view taken along line II of FIG. 1.
Figure 3 is a sectional view of the main portion shown for explaining the structure of the sleeve of the hydraulic chuck according to a preferred embodiment of the present invention
Figure 4 is a plan view showing for explaining the structure of the main slider forming the slider portion of the hydraulic chuck according to an embodiment of the present invention
5 is a front view illustrating the structure of an auxiliary slider forming a slider part of a hydraulic chuck according to an exemplary embodiment of the present invention.
6 to 9 are cross-sectional views for explaining the operating state of the hydraulic chuck according to a preferred embodiment of the present invention.

Hereinafter, a preferred embodiment according to the hydraulic chuck of the present invention will be described with reference to FIGS. 1 to 9.

Prior to the description of the embodiment, the hydraulic chuck of the present invention is an example of the hydraulic chuck applied to the vertical lathe, but is not necessarily limited thereto.

1 is a plan view of a hydraulic chuck according to a preferred embodiment of the present invention, Figure 2 is a front sectional view of a hydraulic chuck according to a preferred embodiment of the present invention.

As can be seen through this, the hydraulic chuck according to the embodiment of the present invention is largely the chuck housing 100, a plurality of jaws 200, the sleeve 300, the slider 400, the moving force transmission unit ( 500) and hydraulic pressure providing unit.

This will be described in more detail below for each configuration.

First, the chuck housing 100 is a portion forming the outer body of the hydraulic chuck, it is composed of a circular block of a hollow structure.

The chuck housing 100 may be configured to be rotated by receiving a driving force from the processing device, or may be configured to perform only a role of providing a holding area of the workpiece in a fixed state to the processing device.

In addition, a plurality of sliding grooves 110 are formed on the outer surface (upper surface) of the chuck housing 100 in the radial direction.

In addition, the central portion of the chuck housing 100 is formed to be open. At this time, the central portion of the chuck housing 100 is provided as a space in which the sleeve 300 to be described later is installed.

Next, the plurality of jaws 200 are a series of configurations for holding the workpiece.

Each jaw 200 is seated in each of the sliding grooves 110, and is configured to grip the workpiece while slidingly moved under the guidance of the sliding groove 110.

At this time, each jaw 200 may be configured to grip the inner peripheral surface of the workpiece, it may be configured to grip the outer peripheral surface of the workpiece.

In addition, the number of jaws 200 depends on the diameter of the workpiece. For example, the larger the diameter of the workpiece, the larger the number of jaws 200. In the embodiment of the present invention, the jaw 200 is provided as six embodiments.

Next, the sleeve 300 is a series of configurations for the lifting movement of the slider unit 400, which will be described later, is provided in the central portion of the chuck housing 100.

The sleeve 300 is formed in a cylindrical shape with an upper end and a lower end opened as shown in FIG. 3, and a plurality of through holes 310 are formed in a circumferential surface thereof.

In this case, the upper cover 320 and the lower cover 330 are respectively coupled to the opened upper and lower ends of the sleeve 300 to close the inner space of the sleeve 300.

Next, the slider 400 is a series of components that are moved up and down in the space in the sleeve 300 receives the hydraulic force.

The slider unit 400 includes a single main slider 410 and a plurality of auxiliary sliders 420.

Here, the main slider 410 is installed to move up and down in the sleeve 300, the outer peripheral surface thereof is formed to be substantially the same as the inner peripheral surface of the sleeve 300 in contact with the inner peripheral surface of the sleeve 300 Move up and down.

In particular, the main slider 410 is formed with a plurality of mounting holes 411 penetrating along the axial direction. In this case, each of the mounting holes 411 are formed at positions conformal to each other when viewed from the center of the axis of the main slider 410. For example, as shown in FIG. 4, each mounting hole 411 is formed at intervals of 120 °, respectively.

In addition, the auxiliary slider 420 is installed in each mounting hole 411 formed in the main slider 410 to be elevated.

In particular, the vertical height of the auxiliary slider 420 is formed to be relatively low compared to the height of the mounting hole 411 formed in the main slider 410, thereby providing an upper space or a lower space in the sleeve 300. The pressure is configured to be provided to the main slider 410 and each auxiliary slider 420 with parallax.

At this time, the blocking bracket 430 is fixedly coupled to the top and bottom surfaces of the main slider 410 to prevent the external protrusion of the auxiliary slider 420 through the corresponding portion while blocking a part of the mounting holes 411. do.

On the other hand, the circumferential surface of the circumferential surface of the circumferential surface of the main slider 410 located on the radial direction side passing through the axial center of each mounting hole 411 from the axial center of the main slider 410 is formed in the sleeve 300 Communication holes 412 corresponding to some of the through holes 310 and communicating with the inside of the mounting hole 411 are formed, respectively, and the moving force transmission unit to be described later between the portions in which the respective communication holes 412 are formed. A coupling groove 413 is recessed to recess the slider coupling end 522 constituting the lever 520 of the 500.

In addition, the slider is coupled to a portion of the circumferential surface of the auxiliary slider 420 installed in the mounting hole 11 of the main slider 410 corresponding to a portion where the communication hole 412 of the main slider 410 is formed. Coupling groove 423 is formed so that the end 522 is concave. This is as shown in Figure 5 attached.

Next, the movement force transmission unit 500 is a series of configurations to convert the lifting movement force of the slider unit 400 to the horizontal movement force to transmit to each jaw (200).

The movement force transmitting unit 500 is composed of a plurality of moving blocks 510 and a plurality of levers 520, the number of the moving block 510 and the lever 520 is the above-described jaw 200 It is provided equal to the number of. That is, six movable blocks 510 are provided and six levers 520 are provided.

Here, each of the moving blocks 510 is connected to the bottom surface of the connecting table 210 fixed to the lower end of each jaw 200 is moved with the jaw 200, each lever 520 is the chuck While being rotatably installed in the housing 100, the movable block 510 is horizontally moved by receiving the lifting movement force of the slider 400.

In particular, the lever 520 is a rotary end 521 rotatably installed in the chuck housing 100, the slider coupling end 522 and the block coupling protruding on the circumferential surface of the rotary end 521 It consists of stage 523.

At this time, the slider coupling end 522 is coupled to the coupling groove 413 formed in the circumferential surface of the main slider 410 through the through hole 310 of the sleeve 300, or the main slider 410 The through hole 412 of the configuration is to be concave coupled to the coupling groove 423 formed on the peripheral surface of the auxiliary slider.

In addition, the block coupling end 523 protrudes to a bottom surface of the movable block 510 while protruding to a portion perpendicular to a portion where the slider coupling end 522 is formed among the peripheral surfaces of the rotary end 521. It is a combined structure.

Next, the hydraulic pressure providing unit is a series of configurations to selectively provide the hydraulic force to the upper space and the lower space in the sleeve 300 so that the slider 400 can be moved up and down.

The hydraulic providing unit may be configured in various ways, but in the exemplary embodiment of the present invention, it is suggested that the hydraulic conduits include fluid conduits 610 and 620 which provide fluid to the upper space and the lower space in the sleeve, respectively. .

In this case, the drive shaft 700 refers to an axis for rotating the hydraulic chuck in response to the driving force of the device.

Meanwhile, in the embodiment of the present invention, the auxiliary sliders 420 constituting the slider unit 400 among the series of components constituting the hydraulic chuck are provided as three corresponding to half of the total number of the jaws 200 and the main. According to the embodiment, three mounting holes 411 formed on the slider 410 are also formed.

That is, the three auxiliary sliders 420 are configured to interlock with the three jaws 200 by the three levers 520 and the three moving blocks 510, and the main slider 410 is the other three levers 520. ) And three moving blocks 510 to be configured to interwork with the remaining three jaws 200.

In the following, the operation of the hydraulic chuck according to the embodiment of the present invention described above will be described in more detail.

First, in the initial state, no hydraulic pressure is provided to the space in the sleeve as shown in FIG. 2, and at this time, the slider 400 forms a state located at the center portion of the space in the sleeve 300.

When the workpiece is placed on the upper surface of the chuck housing 100 in the first state as described above, and the manipulation is carried out for holding the workpiece, the sleeve 300 of each fluid conduit 610 and 620 forming the hydraulic provision unit as shown in FIG. Fluid is provided to the fluid conduit 610 in communication with the upper space in the c).

When the fluid is provided as described above, the fluid is gradually filled in the upper space in the sleeve 300.

In this process, the main slider 410 constituting the slider 400 is moved downward from the time when the fluid is filled in the upper space in the sleeve 300, but the auxiliary slider 420 is mounted at this time Since the fluid is not filled up to the upper space in the ball 411, the auxiliary slider 420 is not moved downward, and when the fluid is filled up to the upper space in the mounting hole 411 as shown in FIG. The auxiliary slider 420 moves downward together with the main slider 410 while being provided with a pressing force by the fluid.

That is, because the above-described principle is operated between the main slider 410 and the auxiliary slider 420 having a parallax, the three levers 520 connected to the main slider 410 are flipped and the lever 520 At the same time as moving the moving block 510 is connected to the three jaw 200 connected to the moving block 510, which causes the three jaw (200) is in contact with the workpiece preferentially centering And a gripping operation.

Thereafter, the three levers 520 connected to the auxiliary slider 420 are flipped to move the movable block 510 connected to the lever 520 and at the same time, three jaws (3) connected to the movable block 510 are moved. 200 to be moved, thereby causing the gripping of the workpiece by the three jaws (200).

Therefore, even if the workpiece is not a circle, the first centering of the workpiece is performed while preferential contact is made by three jaws 200 interlocked with the lifting operation of the main slider 410. The firm grip is performed by the remaining three jaws 200 that are linked to the lifting operation of the three jaws 200 and the auxiliary slider 420, so that six points of stable grip on the outer circumferential surface of the workpiece can be achieved. .

On the other hand, when the processing for the workpiece is completed in the above-described state to release the gripping (or to further open the jaws in the initial state), as shown in FIG. Fluid is provided to the fluid conduit 620 in communication with the lower space in the sleeve 300 among the fluid conduits 610 and 620, and at the same time, the fluid existing in the upper space in the sleeve 300 is connected to the fluid conduit connected to the corresponding part. Through 610.

Then, when the fluid is provided as described above, the lower space in the sleeve 300 is gradually filled with the fluid.

In this process, the main slider 410 constituting the slider portion 400 is moved upward from the time when the fluid is filled in the lower space in the sleeve 300, but the auxiliary slider 420 is mounted at this time Since the fluid is not filled up to the lower space in the ball 411, the auxiliary slider 420 does not move upward. As shown in FIG. 9, when the fluid is filled up to the lower space in the mounting hole 411. The auxiliary slider 420 moves upward with the main slider 410 while being provided with a pressing force by the fluid.

That is, the three levers 520 connected to the main slider 410 are flipped over by the above-described process, and the movable block 510 connected to the lever 520 is moved, and at the same time, the movable block 510 is moved. The three jaws (200) connected to each other are moved, thereby releasing the grip of the workpieces by the three jaws (200).

Thereafter, the three levers 520 connected to the auxiliary slider 420 are moved to move the moving block 510 connected to the lever 520 and at the same time, the three jaws (3) connected to the moving block 510 are moved. 200 is moved, thereby releasing the grip of the workpiece by the three jaws (200).

Thus, the gripping release to the workpiece is completed by the above-described series of processes.

As described above, the hydraulic chuck according to the present invention can center the workpiece while some jaws are preferentially operated, and continue to hold the workpiece while the remaining jaws are operated with a time difference so that a stable grip of the workpiece can be achieved. Has the advantages.

In particular, according to the present invention, the slider unit 400 includes a main slider 410 and a plurality of auxiliary sliders 420, and each of the auxiliary sliders 420 is installed in the main slider 410. As a result, the main slider 410 and the sub slider 420 can be operated with parallax.

100. Chuck Housing 110. Sliding Groove
200. Joo 210. Connecting Rod
300. Sleeve 310. Through hole
320. Top cover 330. Bottom cover
400. Slider section 410. Main slider
411. Mounting hole 412. Communication hole
420. Secondary sliders 413,423. Combined groove
430. Blocking bracket 500. Moving force transmission unit
510. Moving Block 520. Lever
521. Rotary Stage 522. Slider Combined Stage
523. Block Joints 610,620. Fluid pipeline
700. Drive shaft

Claims

A chuck housing having an exterior body, the outer surface having a plurality of sliding grooves formed in a radial direction;
A plurality of jaws respectively seated in the sliding grooves and holding the workpiece while slidingly moved under the guidance of the sliding grooves;
A sleeve provided at a central side of the chuck housing, the upper and lower ends of which are formed in a cylindrical shape closed by a cover, and a plurality of through holes formed in a circumferential surface thereof;
A slider unit comprising a main slider that is moved up and down in the sleeve and a plurality of auxiliary sliders that are moved up and down with a time difference from the main slider;
A moving force transmitting unit converting the lifting movement force of the slider unit into horizontal moving force and transmitting the horizontal moving force to each jaw; And,
And a hydraulic pressure providing unit for selectively providing hydraulic pressure to an upper space and a lower space in the sleeve so that the slider portion can be moved up and down.

The method of claim 1,
The outer circumferential surface of the main slider constituting the slider portion is installed to be moved up and down in contact with the inner circumferential surface of the sleeve,
The main slider is formed with a plurality of mounting holes penetrated along the axial direction, and each of the auxiliary slider is installed in each of the mounting holes of the main slider can be lifted and lifted.

The method of claim 2,
The upper and lower heights of the auxiliary sliders are formed to be relatively lower than the heights of the mounting holes formed in the main sliders, so that the hydraulic pressure provided to the upper space or the lower space in the sleeve has a parallax, and the main sliders and the respective auxiliary sliders. Hydraulic chuck characterized in that configured to be provided to.

The method of claim 2,
Each mounting hole formed in the main slider is formed at a position conformal to the axis center of the main slider, respectively.
The moving force transmitting unit is provided to connect the respective auxiliary sliders and the jaws interlocked therewith, and is provided so as to connect the remaining jaws between the portions where the respective mounting holes are formed among the outer peripheral surfaces of the main slider, respectively. Hydraulic chuck.

The method of claim 1,
The moving force transmission unit
A plurality of moving blocks coupled to the bottom of each jaw and moved together with the corresponding jaws,
And a plurality of levers rotatably installed in the chuck housing and configured to receive horizontal lifting force of the slider to move the respective moving blocks horizontally.

The method of claim 5, wherein
The lever is
A rotating end rotatably installed in the chuck housing;
A slider coupling end protruding from a circumferential surface of the rotary end and penetratingly coupled to a side wall of the main slider or an auxiliary slider through a through hole of the sleeve;
Hydraulic chuck characterized in that the protruding formed in the vertical portion of the circumferential surface of the rotary end with the portion formed with the slider coupling end coupled to the moving block.