KR101546616B1

KR101546616B1 - Clamping device for table of machining center

Info

Publication number: KR101546616B1
Application number: KR1020140036077A
Authority: KR
Inventors: 김태식
Original assignee: 현대위아 주식회사
Priority date: 2014-03-27
Filing date: 2014-03-27
Publication date: 2015-08-21

Abstract

The present invention relates to a table clamping device for a machining center, which can minimize stress due to bending when fuel oil pressure is applied, and can prevent damage due to the contact between a disc and a pad or the disc and a support when the fuel oil pressure is not applied, by increasing a gap distance between the disc and the pad. The table clamping device of the present invention includes: a table where a product is placed; a shaft which is connected to a bottom of the table, and acts a role of a rotation axis to rotate the table; a motor which is installed on an outer circumference of the shaft, and rotates the shaft; a frame which supports the table by being installed on the bottom of the table as being separated from the table using a bearing; a base which is installed in the frame, and has a hole to provide hydraulic pressure; a pad which is installed on the bottom of the base, and is expanded by the hydraulic pressure; a clamp disc which is fixed and combined to the outer circumference of the shaft using a curler and is installed on the bottom of the pad; and a support which is installed on the bottom of the clamp disc and is combined to the base using a bolt.

Description

[0001] The present invention relates to a clamping device for a machining center,

The present invention relates to a table clamping apparatus for a machining center. More specifically, stress caused by bending during hydraulic operation can be minimized, and the clearance between the disk and the pad can be increased, And to prevent the disc and the support from being damaged by contact with each other.

A machine used for machining a metal or non-metal material to a shape and dimensions using appropriate tools, or for finer machining of a semi-finished material by various cutting or non-cutting methods is called a machine tool. Among the above-mentioned machine tools, a machine tool in which chips are generated in the machining process is called a cutting machine tool, and a non-cutting machine tool in which chips are not generated in a machining process is called a metal machining machine. The above-mentioned cutting machine tools include a lathe, a milling machine, a machining center, a drilling machine, a boring machine, a grinding machine, a gear processing machine, and a special processing machine. The metal forming machine includes a mechanical press, Bending machines, stair machines, and drawing machines.

The automation and numerical control (NC) of the cutting machining field is also rapidly progressing owing to the tendency of the industry as a whole. In recent years, a multi-function machining center has emerged as a result of the combined numerical control (NC) of the machine tool which has been divided into a rotary type milling system and a rotary type machining system. It is rapidly expanding.

The above-mentioned machining center is an NC machine tool which automatically carries out several types of cutting machining in one machine, and usually has an automatic tool changing function and a function of automatically cutting and dividing more than two sides of the workpiece. The above-mentioned machining center can be divided into two types, one for machining the entire non-circulating part and the other for machining the rotating part, regardless of the root of the development. The machining centers for non-rotating parts have various parts modified by machining NC milling machines or NC drilling machines. Automatic tool changer (ATC), bullet magazine, automatic A machining center was created by combining an automatic loader (AL). Machining centers for rotating parts are used for various machining operations such as angle division, grooving, hole machining, tapping, etc. after turning the rotary parts with the NC lathe as the power generation base. In addition to the automatic tool changer (ATC) (AL), and the workpiece is held by a separately prepared chuck during processing, and the processed workpiece is released from the chuck, thereby automating the detachment of the workpiece.

The table of the machining center on which the workpiece is placed is clamped by using the hydraulic pressure. The clamping force can be applied to both sides of the clamping disk to obtain a relatively large clamping force. This is disclosed in Korean Patent Registration No. 10-1321647 Quot; Clamping device for table of a machining center "(October 23, 2013).

It is an object of the present invention to provide a table clamp device for a machining center capable of minimizing stress due to bending during a hydraulic operation in order to further improve the technique of the above-mentioned Registration No. 10-1321647.

Another object of the present invention is to provide a table clamp device for a machining center capable of preventing a disc, a pad or a disc and a support from being damaged by contact with each other in a state in which the hydraulic pressure is not operated by enlarging a clearance distance between the disc and the pad I have to.

According to an aspect of the present invention, there is provided a method of manufacturing a table including a table on which a workpiece is placed, a shaft connected to a lower portion of the table and serving as a rotary shaft for rotating the table, A motor provided on an outer circumferential surface of the shaft for rotating the shaft; a frame provided at a lower portion of the table separated from the table using a bearing to support the table; A pad which is provided at a lower portion of the base and is expanded by hydraulic pressure; and a clamp disk which is fixedly coupled to the outer circumferential surface of the shaft using a color, And a clamping unit which is installed at the lower portion of the clamping disk, Preferably comprising including a support coupled.

It is preferable that the structure of the present invention further comprises a sealing ring provided on the outer circumferential surface of the base to prevent hydraulic pressure from leaking.

According to the structure of the present invention, the above-described sealing is positioned symmetrically with respect to the side surface with respect to the central portion of the base, so that it is preferable to maximize the hydraulic action surface which is the lower surface of the pad.

The configuration of the present invention is preferable when the above-described pad is formed in a "C" shape.

The construction of the present invention is preferably such that the above-mentioned pad is fixed to the base using bolts, thereby minimizing the stress due to bending during the hydraulic pressure action.

According to the structure of the present invention, the bolt for fastening the base and the pad functions as a spring, so that when the hydraulic pressure acts, the pad can be bend largely so that a clearance distance between the pad and the clamp disk is increased.

The present invention minimizes the stress caused by bending during hydraulic pressure operation and increases the clearance distance between the disk and the pad so that the disk and the pad or the disk and the support are prevented from being in contact with each other Can have effect.

1 is a sectional view of a table clamp device for a machining center according to an embodiment of the present invention.
2 is a view for explaining a hydraulic action path of a table clamp device for a machining center according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention. Other objects, features, and operational advantages, including the purpose, operation, and effect of the present invention will become more apparent from the description of the preferred embodiments.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not to be construed as limiting the scope of the invention as disclosed in the accompanying claims. It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities, many of which are within the scope of the present invention.

Also, terms and words used in the description and claims of the present invention are defined based on the principle that the inventor can properly define the concept of a term in order to explain its invention in the best way, And should not be construed as limited to only the prior art, and should be construed in a meaning and concept consistent with the technical idea of the present invention. For example, the terms relating to directions are set on the basis of the position represented on the drawing for convenience of explanation.

1, a configuration of a table clamping apparatus for a machining center according to an embodiment of the present invention includes a table 1 on which workpieces are placed, a lower portion of the table 1 A shaft 11 serving as a rotation axis for rotating the table 1, a motor 4 installed on the outer peripheral surface of the shaft 11 for rotating the shaft 11, A frame 3 installed at the lower portion of the table 1 for supporting the table 1 while being separated from the table 1 by using a bearing 2 and a frame 3 provided inside the frame 3, A seal 10 provided on the outer circumferential surface of the base 5 to prevent the hydraulic pressure from leaking out and a base 10 provided on the bottom of the base 5 A pad 6 which is expanded by oil pressure, A clamp disk 8 fixed to the outer circumferential surface of the punch 2 by means of a collar 9 and provided at a lower portion of the pad 6 and a clamp disk 8 installed at a lower portion of the clamp disk 8, And a support (7) coupled with a base (5).

The above-mentioned pads 6 are formed in a "C" -shaped shape, and the bent end surfaces are in the same line shape, so that the shape is simple, which is advantageous in processing.

The pad 6 is fixed to the base 5 by means of bolts, thereby minimizing the stress due to bending during the hydraulic action. The bolt for fastening the base 5 and the pad 6 acts as a spring so that the pad 6 can bend largely when the hydraulic pressure acts so that the clearance between the pad 6 and the clamp disk 8 is increased .

The sealing 10 is positioned symmetrically with respect to the center of the base 5 so that a large clamping force is generated by maximizing the hydraulic action surface which is the bottom surface of the pad 6

The operation of the table clamp device for a machining center according to an embodiment of the present invention with the above-described configuration is as follows.

When power is applied to the motor 4 to generate rotational power, the table 1 connected to the shaft 11 is rotated.

When the rotation of the table 1 is completed and the table 1 is to be clamped, when hydraulic pressure is applied through the base 5 as shown in FIG. 2, the pad 6 is inflated, The hydraulic pressure acts on the circumferential surface of the clamp disc 6 to press the clamp disc 8, thereby causing friction with the clamp disc 8.

At this time, the pad 6 presses the clamp disc 8 and the clamp disc 8 is bent. The support 7 is provided under the clamp disc 8 so that friction with the clamp disc 8 .

As a result, the clamping force is generated and the shaft 11 and the table 1 connected to the clamping disk 8 are stopped.

1: Bracket 2, 10: Wiper

Claims

A shaft connected to a lower portion of the table and serving as a rotating shaft for rotating the table;
A motor provided on the outer circumferential surface of the shaft for rotating the shaft,
A frame installed at a lower portion of the table to support the table, separated from the table using a bearing,
A base disposed inside the frame and having a hole for providing a hydraulic pressure,
A seal provided on an outer circumferential surface of the base to prevent hydraulic pressure from leaking,
A pad which is installed at a lower portion of the base and is expanded by oil pressure,
A clamp disk fixedly coupled to the outer circumferential surface of the shaft using a collar and installed at a lower portion of the pad,
Wherein a support is provided at a lower portion of the clamp disk and is coupled to the base using bolts.

delete

The method according to claim 1,
Wherein the sealing is positioned symmetrically with respect to a side of the center of the base to maximize a hydraulic action surface which is a bottom surface of the pad.

The method according to claim 1,
Wherein the pad is formed in a " C "shape.

The method according to claim 1,
Wherein the pad is fixed to the base using bolts to minimize stress due to bending during hydraulic pressure action.

The method according to claim 1,
Wherein the bolt for fastening the base and the pad serves as a spring so that the pad can bend largely when the hydraulic pressure acts, thereby increasing the clearance distance between the pad and the clamp disk.