KR101440642B1 - tool damage detector of machine tool - Google Patents

Abstract

The present invention relates to a tool breakage detecting apparatus for a machine tool.

A tool breakage detecting apparatus for a machine tool according to an embodiment of the present invention includes first and second supporters (not shown) installed on both sides of an X-axis bed frame 40 on which a table 10 or a table 10 is installed 110a) 110b; A first sensor assembly 120a disposed on the upper side of the first supporter 110a and measuring the distance from the tool T in a non-contact manner; And a second sensor assembly 120a disposed on the upper side of the second supporter 110b and facing the first sensor assembly 120a with a predetermined distance S between the first sensor assembly 120a and the second sensor assembly 120a, The sensor assembly 120b calculates the difference between the sum of the respective measured values measured at the first and second sensor assemblies 120a and 120b and the predetermined distance S, And determines that the tool (T) is broken if the outer diameter value is out of the allowable range.

Tool, breakage, wear, abnormal, detection, sensor, sensing, contactless

Description

Technical Field [0001] The present invention relates to a tool damage detector of a machine tool,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a tool breakage detecting apparatus for a machine tool, and more particularly, to a tool breakage detecting apparatus for a tool that detects breakage or wear of a tool before or after a workpiece is machined by the machine tool.

Generally, a machine tool is equipped with a workpiece on a pallet, and the workpiece is cut by the relative movement of the workpiece and the tool.

As an example of the above-described relative movement, the above-described pallet may be moved in the left and right and front and rear directions, and the main shaft may be moved in the vertical direction with the tool mounted on the main shaft.

As another example of the above-described relative movement, the above-described pallet may be moved in the left-right direction and the tool may be moved in the back-and-forth and up-down directions while being mounted on the main shaft.

In addition, the above-described tools can be housed in a plurality of tool magazines, and the tool can be exchanged between the tool magazine and the main shaft by the automatic tool changer.

Here, among the various tools, there may be tools that have been damaged or abraded, and these tools need to be grasped before or after the machining of the workpiece, so that safety accidents that may occur when machining a workpiece using an abnormal tool Problems such as the risk of the workpiece being lowered, the precision machining of the workpiece lowering, and the lowering of the roughness of the processed surface.

Conventionally, a contact type tool breakage detecting apparatus is used as an apparatus for detecting breakage of a tool, which will be described in detail with reference to FIGS. 1 and 2.

A conventional tool breakage detecting apparatus is provided with a probe 26 on one side of a table 10 and detecting numerical information by the probe 26 contacting the tool to detect breakage or abrasion of the tool.

More specifically, the pallet 30 may be mounted on the table 10 and the workpiece may be mounted on the pallet 30.

In addition, a duct 12 is provided on one side of the above-mentioned table 10, and the duct 12 has rigidity and also serves as a frame.

A case 14 is provided on the side of the duct 12 and a cover 16 which is opened and closed by a hinge is disposed on the upper side of the case 14. [

An actuator 18 is provided in the case 18 and a link member 20 is disposed at the rod end of the actuator 18. The link member 20 is provided with a plate 22 The above-described cover 16 is connected to one side of the above-described link member 20 by a link.

That is, the plate 22 is lifted and lowered by the driving of the actuator 18, and the cover 16 is opened and closed.

Further, the above-mentioned plate 22 can be stably lifted and lowered by the linear guide without shaking, and the linear guide is fixed to one side of the case 14 described above.

A sensor assembly 24 and a probe 26 are provided on one side of the plate 22 and the probe 26 is in contact with the object to be measured so that the moment when the probe 26 contacts the sensor assembly 24, As shown in FIG.

When the detection signal is generated in the sensor assembly 24, the detection signal is transmitted to the control unit of the machine tool to calculate the detection value.

The contact between the probe 26 and the tool will be described in more detail as follows.

The table 10 and the tool are in relative motion and at this time the probe 26 is moved together with the movement of the table 10 so that the probe 26 is brought into contact with the tool depending on the relative position of the table 10 and the tool .

The tool T can approach the upper position of the pallet 30 in a state where the tool T is mounted on the main shaft and can be disposed in advance on the movement path on which the tool T approaches, The probe 26 may be moved.

That is, the distance from the reference position to the position where the probe 26 contacts the tool can be calculated by the coordinates of the numerical control. When the detected value is out of the range of the reference distance, the tool is judged to be abnormal, Or light the traffic light so that the operator can be aware of the condition of the tool.

The conventional tool breakage detecting apparatus constructed as described above has the following problems.

The tool breakage detecting device is to detect the state of the tool before or after machining the workpiece immediately after the tool is mounted on the main spindle and to avoid interference with the workpiece W at other times.

In other words, it is necessary to appropriately arrange it on the movement path of the tool in order to avoid interference with the workpiece W, but there is a problem that such installation position selection is subject to many restrictions.

Particularly, in the conventional tool breakage detecting apparatus, there is a high possibility that interference with an installation position, a workpiece material, a fixture or the like occurs, thereby increasing the restriction of the tool movement path.

There is a problem in that it is not free to process the workpiece in a more various form because the constraint is imposed in setting the tool movement path as described above.

In addition, when the workpiece is cut, foreign matter such as cutting oil, cooling water or cutting chips may damage the sensor assembly 24 or the probe 26. To prevent such damage, the case 14 and the cover 16 ) Are required.

Particularly, in order to detect the breakage of the tool, the actuator 18 is extended and driven to open the lid 16 and raise the sensor assembly 24 and the probe 26. After the breakage detection of the tool is completed The actuator 18 is contracted and driven to close the lid 16 and the sensor assembly 24 and the probe 26 must be hidden inside the case 14 so that the construction and operation are very complicated and the cost of the machine tool Is increased.

In addition, the wiring of the sensor assembly 24 and wiring such as an air blow line for preventing foreign matter from entering are required to pass through the inside of the table 10, There is a problem of inconvenience.

On the other hand, conventional tool breakage detection devices have a limited problem of tool size that can not measure a rather large tool when measuring the diameter of the tool.

For example, in order to measure the diameter of a tool, the diameter of the tool is measured by contacting the lowest surface of the tool and contacting the highest surface of the tool to calculate the distance difference. At this time, the height of the probe 26 is determined, As shown in FIG.

In addition, since the tool is limited in the accessible space while avoiding interference with the pallet, there is a limit to approaching the tool at a low height.

Therefore, in order to arrange the probe 26 at a high height, the structure of the case 14 is changed to a high level or the actuator 18 ) Is required to be long.

When the structure of the case 14 or the actuator 18 is changed as described above, it is necessary to consider the interference with the workpiece W, the tool, the fixture, etc. when machining the workpiece. There is a very limited problem.

On the other hand, even at the position of the case 14, a larger workpiece W can be mounted on the pallet 30 as the position is further away from the center of the table 10, It is very limited.

The reason why the installation position of the case 14 described above is limited will be described as follows.

When the table 10 is moved in the direction in which the case 14 is installed, the case 14 is brought close to the wall panel of the machine tool. As described above, When the case 14 is disposed at a position far from the center of the table 10, the case 14 may hit the wall panel of the machine tool.

Therefore, the conventional tool breakage detecting apparatus has a problem that the maximum size of the workpiece W is very limited and the use efficiency of the machine tool is deteriorated.

On the other hand, the sensor assembly 24 and the probe 26 are required to be regularly maintained as a very sophisticated component. When the case 14 is installed, it is positioned inside the wall panel of the machine tool, There is a problem that the accessibility of the system is very inconvenient.

On the other hand, as described above, the probe 26 is in contact with the tool T to obtain data by contact with the tool T, for example. At this time, the number of contact between the probe 26 and the tool T is increased There is a problem in that the probe 26 may be deformed abnormally and thus the outer diameter of the tool T may not be accurately measured as the probe 26 is deformed.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a tool breakage detecting apparatus for a tool that can accommodate a workpiece, a jig, and a movement path of a tool while avoiding interference with a maximum size of the workpiece .

It is another object of the present invention to provide a tool breakage detecting apparatus for a machine tool which simplifies an apparatus for detecting a breakage of a tool and facilitates access by an operator to facilitate maintenance.

It is still another object of the present invention to provide a tool breakage detecting apparatus for a machine tool capable of measuring the tool regardless of the diameter of the tool even if the diameter of the tool is somewhat large.

The present invention has been made in view of the above problems, and it is an object of the present invention to at least partially solve the problems in the conventional arts. There will be.

According to an aspect of the present invention, there is provided an apparatus for detecting a breakage of a tool of a machine tool, including: a table or first and second supporters spaced apart from both sides of an X-axis bed frame on which the table is installed; A first sensor assembly disposed above the first supporter and measuring a distance from the tool in a non-contact manner; And a second sensor assembly disposed on the upper side of the second supporter and spaced apart from the first sensor assembly and facing the first sensor assembly and measuring the distance from the tool in a non-contact manner, , The difference between the sum of the measured values measured by the second sensor assembly and the predetermined distance is calculated to determine the outer diameter of the tool and the tool is judged to be broken if the outer diameter exceeds the allowable range.

In addition, the first sensor assembly and the second sensor assembly may be installed at different heights.

The first and second supporters may be bent upward or downward so that a part of the first and second supporters are disposed outside the wall panel of the machine tool.

The first sensor assembly or the second sensor assembly may further include a sensor cover for protecting the sensor.

The details of other embodiments are included in the detailed description and drawings.

The apparatus for detecting breakage of a tool according to the present invention as described above can accommodate the maximum size of a workpiece that can avoid interference with a workpiece, jig and tool movement path by arranging a non-contact type sensor assembly apart. .

In addition, the apparatus for detecting breakage of a tool according to the present invention can simplify an apparatus for detecting a breakage of a tool by disposing a non-contact type sensor assembly at a position spaced apart from both sides, It is easy to maintain and easy maintenance.

In addition, the tool breakage detecting apparatus of the present invention permits the tool to be positioned between the sensor assemblies spaced apart, so that the tool can be measured irrespective of the diameter of the tool even if the diameter of the tool is somewhat large.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and how to accomplish them, will become apparent by reference to the embodiments described in detail below with reference to the accompanying drawings.

Like reference numerals refer to like elements throughout the specification.

Hereinafter, a tool breakage detecting apparatus for a machine tool according to an embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG.

FIG. 3 and FIG. 4 are illustrations for explaining a tool breakage detecting apparatus of a machine tool according to an embodiment of the present invention.

3 and 4, a tool breakage detecting apparatus 100 of a machine tool according to an embodiment of the present invention may be installed on one side of an X-axis bed frame 40 on which the table 10 is moved .

The first supporter 110a and the second supporter 110b are disposed on both sides of the X axis bed frame 40 and the angle supporter 112 is disposed above the first and second supporters 110a and 110b. And first and second sensor assemblies 120a and 120b, which are non-contact type detection means, may be installed on one side of the angle supporter 112, respectively.

The second sensor assembly 120b described above may be installed to face the first sensor assembly 120a described above with a predetermined distance S from the first sensor assembly 120a.

As described above, the first and second sensor assemblies 120a and 120b have a light receiving unit and a light emitting unit. The first and second sensor assemblies 120a and 120b receive the reflected light from the light receiving unit after emitting light from the light emitting unit, And may be a laser sensor for measuring the distance to the object to be measured.

The first and second supporters 110a and 110b may be formed by bending the first and second supporters 110a and 110b on the lower side in the form of letter L and the vertical portion may be disposed outside the wall panel 210 The second sensor assembly 120a, 120b may be disposed inside the wall panel 210 described above.

The angle supporter 112 may be formed with a flange 115 and the flange 115 may be fastened to the wall panel 210 to be described later.

As shown in Fig. 4, the first and second mounting tables 114a and 114b are inclined at one end of the angle supporter 112 described above.

The first sensor assembly 120a and the second sensor assembly 120b described above are installed on the first mount 114a and the second mount 114a. The second sensor assembly 120b may be disposed to face each other.

On the other hand, the height (length) of the first supporter 110a and the second supporter 110b may be different from each other. For example, when one of the first supporter 110a and the second supporter 110b is higher, 120b may be inclined.

As described above, the first and second sensor assemblies 120a and 120b can be disposed in a tilted state as the imaginary line L is inclined. Here, the first and second mounts 114a ) 114b may be formed to be inclined at a predetermined angle so as to correspond to the virtual line L described above.

Although not specifically shown, the first and second sensor assemblies 120a and 120b described above may be capable of fine positioning to face each other.

In the case of the second sensor assembly 120b disposed on the lower side, a sensor cover 130 may be further disposed to protect the sensor.

An example of the installation of the tool breakage detecting apparatus 100 of the machine tool according to an embodiment of the present invention will be described with reference to FIGS. 5 to 7. FIG.

5 and 6 are illustrations of front and side views for explaining an installation example of a tool breakage detecting apparatus for a machine tool according to an embodiment of the present invention, Fig. 3 is a plan view for explaining a tool breakage detecting apparatus of a machine tool according to the present invention.

5 and 6, the table 10 can be installed to linearly move the machine tool from the upper side to the left and right of the X-axis bed frame 40, and the X- Axis bed frame 50 for linear movement in the direction in which the above-mentioned table 10 is installed (front-back direction) is provided on the upper side of the Y-axis bed frame 50, Can be installed.

The main shaft 70 may be installed on the Z-axis frame 60 so as to linearly move in the direction of elevation and descent. An automatic tool changer 80 and a tool magazine 90 may be installed on one side of the machine tool .

The aforementioned tool magazine 90 accommodates various tools T and the above-described automatic tool changer 80 automatically exchanges the tool T between the tool magazine 90 and the main shaft 70 will be.

In addition, the periphery of the table 10 can be arranged in the form of enclosing the wall panel 210, and the wall panel 210 serves as a safety device for cutting off the processing area and the outside.

5, the tool breakage detecting apparatus 100 is configured such that the first and second supporters 110a and 110b are disposed on both sides of the X-axis bed frame 40 so that the tool T Can be located between the first sensor assembly 120a and the second sensor assembly 120b described above and the outer diameter of the tool T can be measured, especially when the tool T passes the imaginary line L .

The tool breakage detecting apparatus 100 is disposed at a position where interference with the movement of the table 10 and the main shaft 70 or the tool T does not occur so that the machining of the workpiece W can be made more free It is.

5, the first sensor assembly 120a and the second sensor assembly 120b may be arranged such that the imaginary lines L facing each other are inclined. By arranging the first sensor assembly 120a and the second sensor assembly 120b so as to be inclined as described above, The distance between the first sensor assembly 120a and the second sensor assembly 120b can be ensured so that the movement path and interference of the work W, jig or tool T are minimized when the work W is processed .

6 and 7, the first and second supporters 110a and 110b are disposed outside the wall panel 210 and the first and second sensor assemblies 110a and 110b are disposed by the angle supporter 112, The first and second sensor assemblies 120a and 120b are supported by the first and second sensor assemblies 120a and 120b without requiring the operator to approach the processing area. The first and second sensor assemblies 120a and 120b can be easily accessed and installed, thereby facilitating the installation and maintenance of the first and second sensor assemblies 120a and 120b.

8, the heights of the first sensor assembly 120a and the second sensor assembly 120b may be arranged at the same height so that the first sensor assembly 120a and the second sensor assembly 120b The imaginary line L facing each other can be horizontal.

The height of the first and second supporters 110a and 110b may be equalized by disposing the first and second sensor assemblies 120a and 120b so that the imaginary line L is horizontal And the first and second mounting portions 114a and 114b can be provided in a horizontal state, so that they are more convenient to manufacture and more convenient to install as compared with those designed to be inclined .

Further, a tool breakage detecting apparatus of a machine tool according to an embodiment of the present invention can be installed in the table 10, which will be described with reference to FIG.

9 is an exemplary view for explaining a tool breakage detecting apparatus of a machine tool according to another embodiment of the present invention.

The first and second supporters 110a and 110b may be disposed on both sides of the table 10 and the first and second supporters 110a and 110b may be disposed on the first and second supporters 110a and 110b, The second sensor assemblies 120a and 120b may be disposed.

In addition, the height of the first and second supporters 110a and 110b may be the same, and the virtual line L connecting the sensors on both sides may be horizontal.

On the other hand, the heights of the first and second supporters 110a and 110b may be different from each other. At this time, the hypothetical line L connecting the sensors on both sides may be inclined, L may be disposed obliquely to distant the first sensor assembly 120a and the second sensor assembly 120b so as to avoid interference with the workpiece W, fixture, and tool path.

The tool breakage detecting apparatus 100 of the machine tool according to an embodiment of the present invention configured as described above operates as follows.

The table 10 and the main shaft 70 make a relative movement with the tool T mounted on the main shaft 70 so that the tool T can move between the first sensor assembly 120a and the second sensor assembly 120b, And the tool T passes over the imaginary line L by the movement of the main shaft 70 in the ascending / descending direction.

At this time, the first and second sensor assemblies 120a and 120b measure the distance to the tool T and thereby the outer diameter of the tool T can be measured.

In addition, when the tool T is positioned between the first and second sensor assemblies 120a and 120b, the tool T can be moved to either the first sensor assembly 120a or the second sensor assembly 120b The first sensor assembly 120a can measure the outer diameter of the tool T even if the first sensor assembly 120a or the second sensor assembly 120b is misaligned with respect to the first sensor assembly 120a or the second sensor assembly 120b. The distance between the first sensor assembly 120a and the second sensor assembly 120b is fixed at an absolute distance S so that the distance between the first sensor assembly 120a and the second sensor assembly 120b, By calculating the difference in distance value, the outer diameter of the tool T can be easily measured.

Further, when the tool T is in an abnormal state, for example, when the tool T is damaged or abraded to such an extent that the tool T is out of the allowable range, the value measured by the first and second sensor assemblies 120a and 120b When the abnormal state of the tool T is detected in this manner, the warning light is emitted or a warning sound is generated so that the operator can visually or audibly recognize the abnormal state.

On the other hand, even if the outer diameter of the tool T is somewhat larger, the tool T can always be disposed between the first sensor assembly 120a and the second sensor assembly 120b, The outer diameter of the tool T can be measured.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. will be.

It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

The apparatus for detecting a breakage of a tool of a machine tool according to an embodiment of the present invention can be used to detect a condition such as breakage or wear of a tool before machining the workpiece so that it can be notified to an operator when the tool is abnormal.

1 is an exemplary view for explaining a conventional tool breakage detecting apparatus for a machine tool.

FIG. 2 is an exemplary view for explaining a conventional tool breakage detecting apparatus for a machine tool, wherein (a) is a plan view, (b) is a front view, and FIG. 2 (c) is a side view.

FIG. 3 and FIG. 4 are explanatory diagrams for explaining a tool breakage detecting apparatus of a machine tool according to an embodiment of the present invention.

5 to 7 are illustrations of front, side and plane views for explaining an example of installation of a tool breakage detecting apparatus of a machine tool according to an embodiment of the present invention.

8 is an exemplary view for explaining a tool breakage detecting apparatus of a machine tool according to another embodiment of the present invention.

9 is an exemplary view for explaining a tool breakage detecting apparatus of a machine tool according to another embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS (S)

10: Table 12: Duct

14: Case 16: Cover

18: actuator 20: link member

22: plate 24: sensor assembly

26: probe 30: pallet

40: X-axis bed frame 50: Y-axis bed frame

60: Z-axis frame 70:

80: Automatic tool changer 90: Tool magazine

100: Tool breakage detecting device

110a, 110b: first and second supporters

112: Angle supporter

114a, 114b: first and second mounting tables

115: Flange

120a, 120b: first and second sensor assemblies

130: Sensor cover

210: Machine tool wall panel

T: Tool W: Workpiece

Claims (4)

First and second supporters 110a and 110b spaced apart from both sides of the table 10 or the X-axis bed frame 40 on which the table 10 is installed; A first sensor assembly 120a disposed on the upper side of the first supporter 110a and measuring the distance from the tool T in a non-contact manner; And A distance between the first sensor assembly 120a and the first sensor assembly 120a and a distance between the second sensor assembly 120a and the first sensor assembly 120a are measured in a non-contact manner on the upper side of the second supporter 110b, And a second sensor assembly (120b) The difference between the sum of the respective measured values measured by the first and second sensor assemblies 120a and 120b and the predetermined distance S is calculated to obtain an outer diameter value of the tool T, And determines that the tool (T) is broken if the tool is out of the range. The method according to claim 1, The first sensor assembly 120a and the second sensor assembly 120b, Wherein the height of the tool is different from that of the tool. The method according to claim 1, The first and second supporters 110a and 110b, The upper side or the lower side is refracted so that a part of the first and second supporters 110a and 110b is disposed outside the wall panel 210 of the machine tool Wherein the first and second sensor assemblies (120a) and (120b) are disposed inside the wall panel (210). The method according to claim 1, The first sensor assembly (120a) or the second sensor assembly (120b) Further comprising a sensor cover (130) for protecting the sensor.

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