KR20160041534A - Machine tool - Google Patents

Abstract

Provided is a machine tool comprising: a drive part which comprises a clamping device for clamping and unclamping a material or a tool, and an actuator for providing clamping force or unclamping force to the clamping device; a fluid sensing part which senses the flow rate or direction of fluid provided to the clamping device; and a control part which controls the drive part by comparing the flow rate or direction of the fluid sensed from the fluid sensing part with the upper and lower values of a preset flow rate or direction. Therefore, the present invention accurately and rapidly determines whether the material or the tool is clamped or not.

Description

Machine tool {MACHINE TOOL}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a machine tool equipped with a clamping sensing device capable of accurately and promptly detecting whether or not a jig is clamped or unclamped.

A machine tool is a machine that is used for machining metal or nonmetal materials (hereinafter referred to as "base material") into shapes and dimensions by using various cutting or non-cutting machining methods, or for adding more precise machining.

Such machine tools include components such as a spindle or jig for clamping or unclamping a tool or base metal, and a hydraulic actuator is provided to provide a force for clamping or unclamping the spindle or jig.

The clamping device using this hydraulic pressure includes a proximity sensor or a pressure sensor on the spindle or jig (hereinafter clamping device) to confirm whether the workpiece or tool has been clamped or unclamped.

Specifically, the proximity sensor determines whether or not the clamping device is clamped by whether the clamping device is close to the base material or the tool. The pressure sensor senses the hydraulic pressure flowing into or out of the clamping device to determine whether or not the clamping device clamps the clamping device.

However, in a machine tool including a conventional clamping sensing device using such a proximity sensor or a pressure sensor, there is a case where the next operation (machining or transfer) proceeds while the clamping or unclamping operation is not completed, There is a case where the base material or the tool is damaged or the machining failure occurs due to the collision between the tool and the machine tool component.

In addition, a conventional clamping sensing apparatus using a proximity sensor or a pressure sensor may erroneously detect whether or not the clamping is intact before being clamped by a foreign material such as a chip or a bolt between the workpiece or the workpiece to be clamped, have.

In order to prevent such a problem, there is a method of delaying the sensor detection time and performing the next operation after a predetermined time. However, the above problems may also occur because the clamping or unclamping state can not be grasped, There is a problem that productivity is lowered.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a machine tool including a clamping sensing device capable of accurately and promptly determining whether a workpiece or a tool is clamped.

It is still another object of the present invention to provide a machine tool in which productivity and reliability of work are improved.

In order to accomplish the above object, the present invention provides a clamping apparatus comprising: a driving unit including a clamping device for clamping or unclamping a base material or a tool; and an actuator for providing a clamping force or an unclamping force to the clamping device; A fluid sensor for sensing a flow rate or direction of the fluid provided to the clamping device; And a control unit for controlling the driving unit by comparing the upper limit value and the lower limit value of the predetermined flow amount or direction with the flow rate or direction detected by the fluid detection unit.

The fluid sensing unit may include a flow rate sensor for sensing a flow rate of the fluid supplied to the clamping unit or a direction sensor for sensing a direction of a fluid provided to the clamping unit.

The apparatus may further include a memory unit storing an upper limit value and a lower limit value of the clamping force and the unclamping force depending on the type of the base material or the tool.

The control unit may set an initial state in which the base material or the tool is unclamped, repeatedly perform clamping and unclamping of the base material or tool by a predetermined number of times, receive the flow rate or direction sensed by the fluid sensor, The upper limit value and the lower limit value of the required flow amount or direction and the upper limit value and the lower limit value of the flow amount or direction required for unclamping are calculated and the upper limit value and the lower limit value of the flow amount or direction required for the clamping calculated in the memory and the upper limit value of the flow amount or direction necessary for unclamping The lower limit value can be stored.

An alarm unit which receives a signal by the control unit and transmits an abnormality to a user as sound or light when the predetermined upper limit value and lower limit value of the flow amount or direction are out of the range; A display unit for displaying the fluid pressure or direction of the fluid sensed by the fluid sensor; And an input unit implemented as a button or a touch panel for controlling the machine tool.

The present invention can sense the flow or direction of a fluid flowing between an actuator and a clamping device for clamping or unclamping, and accurately and quickly detect whether the workpiece or tool is clamped.

Accordingly, the present invention enables a rapid and accurate process, thereby improving productivity, improving machining accuracy, preventing breakage of tools, and improving durability and reliability.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a diagram of a module included in a machine tool according to an embodiment of the present invention.
2 is a flowchart illustrating a method of calculating an upper limit value and a lower limit value of clamping or unclamping in a machine tool according to an embodiment of the present invention.
3 is a flowchart illustrating an operating state according to whether or not a machine tool is clamped 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.

Unless defined otherwise, all terms used herein are the same as the generic meanings of the terms understood by those of ordinary skill in the art, and where the terms used herein contradict the general meaning of the term, they shall be as defined herein.

It is to be understood, however, that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

The present invention can accurately and quickly grasp the state of a spindle or a jig (hereinafter referred to as a clamping device) for clamping or unclamping a tool or a base material in a manner different from the conventional method using a proximity sensor or a pressure sensor. Explain.

Further, although the embodiments of the present invention can be described on the basis of a machining center, the present invention can be applied to components for clamping or unclamping in different types of machine tools such as a turning center.

1 is a view showing a module included in a machine tool according to an embodiment of the present invention.

1, the present invention may include a driving unit 100, a fluid sensing unit 200, and a controller 300, and may further include a transmitting unit 400, a memory unit 500, or a monitor unit 600, As shown in FIG.

The driving unit 100 includes a clamping device 110 for clamping or unclamping a base material or a tool, a clamping device 110 for clamping or unclamping the base material or tool, 110 to provide a clamping force or an unclamping force.

The fluid sensing unit 200 senses the flow rate or direction of the fluid supplied to the clamping unit 110. The fluid sensing unit 200 senses the flow rate of the fluid supplied to the clamping unit 110 And a direction sensing sensor 220 for sensing the direction of the fluid supplied to the clamping device 110. [

In addition, the fluid sensing unit 200 may sense the flow rate and the direction of the fluid at the same time, and may include both the flow rate sensing sensor 210 and the direction sensing sensor 220 to achieve more accurate and quick control of the machine tool have.

The control unit 300 may directly or indirectly be connected to the driving unit 100, the fluid sensor unit 200, the monitor unit 600, or the memory unit 500 to transmit and receive signals.

Accordingly, the control unit 300 may control the driving unit 100 by comparing the upper limit value and the lower limit value of the predetermined flow rate or direction with the flow rate or direction sensed by the fluid sensor unit 200. The control state of the control unit 300 will be described later.

The transfer unit 400 includes a conversion unit 410 for converting an analog signal corresponding to the flow rate and / or directionality of the fluid sensed by the fluid sensor unit 200 into a digital signal, And transmits a digital signal to the control unit 300 or a control signal of the control unit 300 to the conversion unit 410.

The memory unit 500 may store the upper limit value and the lower limit value of the clamping force and the unclamping force according to the type of the base material or the tool and may store programs or information necessary for driving the other machine tools, To provide information inside.

The memory unit 500 may be included in the controller 300.

The monitor unit 600 may include a display unit 610, an input unit 620, and / or an alarm unit 630. The alarm unit 630 may include a monitor unit 600, And may be independently arranged with respect to the monitor unit 600.

The display unit 610 may display the fluid pressure or direction of the fluid sensed by the fluid sensing unit 200 and may display the status of all or some of the components of the driving unit 100. [ The contents displayed on the display unit 610 may receive information directly from the fluid sensor unit 200 or the driving unit 100 or may be transmitted through the controller unit 300.

The input unit 620 may be implemented as a jog dial, a button, and / or a touch panel for controlling the machine tool, and may be implemented as the display unit 610 when implemented as a touch panel.

The alarm unit 630 receives a signal from the controller 300 when the predetermined upper limit value and the lower limit value of the flow amount or direction are out of range, and can transmit an abnormality to the user as sound or light. It is possible to visually and audibly transmit an operator to the operator when an abnormality occurs in the element or when the work is finished.

The machine tool according to the embodiment of the present invention may include the following features.

FIG. 2 is a flowchart illustrating a method of calculating an upper limit value and a lower limit value of clamping or unclamping in a machine tool according to an embodiment of the present invention. FIG. 3 is a flowchart Fig.

Referring to FIG. 2, in the memory unit 500 of the embodiment, the information of the base material or the tool to be clamped may be stored in advance, but the information of the base material or the tool may be newly stored.

To this end, the clamping device 110 (e.g., jig) is set to an initial state in which nothing is clamped, that is, it is recognized as a zero in the unclamping state, and if this initial state is not set, An unclamping state is established and an initial state is set (S10).

When the initial state is set (S20), the control unit 300 extracts the flow rate value and / or the direction value of the fluid flowing at the time of clamping by clamping the base material or tool, and unclamps the flow rate value of the fluid flowing at the time of unclamping And / or a direction value (S30).

Thereafter, the clamping and unclamping are repeated by a predetermined number of times (for example, clamping 5 times and unclamping 5 times). When the predetermined number of times is filled up (S40), the flow rate sensed by the fluid sensing part 200 Or direction, calculates an upper limit value and a lower limit value of the flow amount or direction necessary for clamping, an upper limit value and a lower limit value of the flow amount or direction necessary for unclamping, and outputs the upper limit value and the lower limit value of the calculated clamping, the upper limit value and the lower limit value of the unclamping, (S50).

Herein, the upper limit value or the lower limit value can be set to an upper limit value or a lower limit value range up or down from the average value of the values detected several times. Therefore, information on one base material or tool is 1) an upper limit value of the flow rate provided at the time of clamping, 2 4) the upper limit of the flow rate provided during unclamping; 5) the lower limit value of the flow rate when unclamping; and 6) the lower limit value of the flow rate when unclamping. .

The information of such a base material or tool can be applied as follows.

Referring to FIG. 3, it can be determined whether or not the clamping is performed well before the machine tool is operated to process the base material. In this case, the controller 300 clamps the base material or tool to the clamping device 110 (S100), transmits the clamping sensed by the fluid sensing device 200 to the controller 300, The control unit 300 compares the information stored in the memory unit 500 with the information stored in the memory unit 500.

If the current value is within the predetermined range (between the upper limit value and the lower limit value) (S200), processing of the base material will be started, otherwise, the alarm unit 630 delivers an alarm to the operator and clamps the base material or tool again .

This series of processes can be applied to the unclamping of the base material or the tool, and if the unclamping is successful, the other base material or tool can be quickly replaced or the operation of the machine tool can be quickly terminated.

That is, the embodiment of the present invention is advantageous in that it can accurately and quickly control the machine tool by sensing the flow amount and / or the direction of the fluid whether the clamping or unclamping is performed.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined by the appended claims. Range and its equivalent range.

100: driving part 110: clamping device
120: actuator 200:
210: Flow sensor 220: Direction sensor
300: control unit 400:
410: conversion unit 420: interface unit
500: memory unit 600: monitor unit
610: Display unit 620: Input unit
630: Alarm unit

Claims (5)

A driving unit 100 including a clamping device 110 for clamping or unclamping a base material or a tool, and an actuator 120 for providing a clamping force or an unclamping force to the clamping device 110;
A fluid sensing part 200 for sensing the flow rate or direction of the fluid supplied to the clamping device 110; And
And a control unit (300) for controlling the driving unit (100) by comparing the upper limit value and the lower limit value of the predetermined flow amount or direction with the flow rate or direction detected by the fluid detection unit (200).
The method according to claim 1,
The fluid sensing unit 200 includes a flow sensor 210 for sensing a flow rate of a fluid supplied to the clamping unit 110 or a direction sensor 220 for sensing a direction of a fluid supplied to the clamping unit 110 ).
The method according to claim 1,
And a memory unit (500) for storing an upper limit value and a lower limit value for the clamping force and the unclamping force according to the type of the base material or the tool.
The method of claim 3,
The control unit (300)
The initial state is set by unclamping the base material or the tool,
The clamping and unclamping of the base material or the tool is repeated a predetermined number of times to receive the flow rate or direction sensed by the fluid sensor unit 200. The upper and lower limits of the flow rate or direction required for clamping and the flow rate required for unclamping, The upper limit value and the lower limit value of the direction are calculated,
Wherein the upper limit value and the lower limit value of the flow amount or direction required for clamping calculated in the memory and the upper limit value and the lower limit value of the flow amount or direction necessary for unclamping are stored.
The method according to claim 1,
A display unit 610 for displaying the fluid pressure or direction of the fluid sensed by the fluid sensor unit 200;
An input unit 620 embodied as a button or a touch panel for controlling the machine tool; And
And an alarm unit 630 for receiving a signal from the control unit 300 and delivering an abnormality to the user as sound or light when the predetermined upper limit value and the lower limit value of the flow amount or direction are out of the predetermined range. Including machine tools.

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