JP2003275945A - Chipping accumulation detecting method and its device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the breakage of feeding mechanisms such as cover devices or ball screws by allowing the automatic detection of the state of chippings or others being accumulated on the cover devices. <P>SOLUTION: The chipping accumulation detecting method and its device for a machine tool having a moving table 1 provided movably on a guide plane and the cover devices 2 provided on both sides of the moving table 1 for covering the guide plane comprise load current detecting means 31 for detecting a load current in a servo motor 30 for a feed shaft as detecting means 3 for detecting a degree of the accumulation of chippings K on covers 20 when the moving table 1 is located in each of a first region and a second region in its stroke range, determining means 4 for determining whether the allowable amount or more of chippings K are accumulated or not on the cover devices 2 in accordance with a value detected by the detecting means 3, and informing means 5 for informing of the accumulation of the chippings K in accordance with the determination result of the determining means 4. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool having a movable table movably on a guide surface and a cover device for covering the guide surface on both sides of the movable table. TECHNICAL FIELD The present invention relates to a method and an apparatus for detecting the accumulation of chips, which detects the accumulation state of dust.

[0002]

2. Description of the Related Art A conventional sliding surface protection device (Shokai Sho 62-1
No. 53035) is a movable cover M as shown in FIG.
A wiper member WM is provided at the front end of C, and another movable cover M
By contacting and moving on the outer side surface OS of C to wipe the outer side surface OS, chips and the like accumulated on the outer side surface OS are mechanically removed to prevent invasion into the movable cover MC. Met.

[0003]

The above-mentioned conventional sliding surface protection device has the wiper member W provided at the front end of the movable cover MC.
The M is used to mechanically remove the chips K and the like accumulated on the outer surface OS to prevent the chips K and the like from entering the movable cover MC. There was a problem that was not able to detect automatically.

Therefore, the inventor of the present invention has provided a movable base movably on the guide surface, and in a machine tool having cover devices for covering the guide surface on both sides of the movable base, the movable base moves within its stroke range. From the relationship of the load current of the servo motor of the feed axis detected at different positions when
Focusing on the technical idea of the present invention of detecting the deposition state of cutting chips on the cover device, as a result of further research and development, it is possible to automatically detect the deposition state of cutting chips and other cover devices. The present invention has been achieved to achieve the purpose of preventing damage to the feed mechanism such as the cover device or the ball screw.

[0005]

According to the chip accumulation detecting method of the present invention (the first invention according to claim 1), a movable table is provided movably on the guide surface, and the guide surface is provided on both sides of the movable table. In a machine tool provided with a cover device for covering the cutting machine, the chip on the cover device is determined from the relation of the load current of the servo motor of the feed axis detected at different positions when the movable table moves within its stroke range. Is to detect the accumulation state of.

In the chip deposition detecting method of the present invention (the second invention according to claim 2), in the first invention, the different position where the load current is detected is the center of the stroke range. It is the position of the region and the position near the stroke end.

The chip accumulation detecting device of the present invention (the third invention according to claim 3) is provided with a movable table movably on the guide surface, and a cover device for covering the guide surface on both sides of the movable table. In the machine tool provided, a detection means for detecting the degree of accumulation of chips on the cover when the movable table is located in the first area and the second area within the stroke range, and the detection means. And a determination means for determining whether or not the amount of chips accumulated on the cover device exceeds the allowable amount based on the detected value.

In the chip accumulation detecting device of the present invention (the fourth invention according to claim 4), in the third invention, the detection means detects the load current of the servomotor of the feed shaft. It is composed of.

In the chip accumulation detecting device of the present invention (the fifth invention according to claim 5), in the fourth invention, the first area which is a machining area in the center of the stroke range and the vicinity of the stroke end are provided. When the deviation of the detected value from the second area, which is an area, becomes equal to or more than a predetermined value, the determination means determines that the accumulation of chips on the cover device exceeds the allowable amount.

In the chip accumulation detector of the present invention (sixth invention according to claim 6), in the fourth invention, the first area which is a machining area at the center of the stroke range and the vicinity of the stroke end are provided. When the ratio of the detected values in the second region, which is a region, becomes equal to or greater than a predetermined value, the determination unit determines that the accumulation of chips on the cover device exceeds the allowable amount.

In the chip accumulation detecting device of the present invention (the seventh invention according to claim 7), in the fourth invention, the detecting means comprises a chip presence / absence detecting means for detecting the presence / absence of chips. There is something.

In the chip accumulation detecting device of the present invention (the eighth invention according to claim 8), in the fourth invention, the detecting means comprises a strain detecting means for detecting the strain of the cover of the cover device. It is what

The chip accumulation detecting device of the present invention (the ninth invention according to claim 9) is provided with an informing means for informing the accumulation of the chips based on the judgment result of the judging means in the fourth invention. It is a thing.

[0014]

In the chip accumulation detecting method according to the first aspect of the present invention having the above-described structure, the movable table is provided so as to be movable on the guide surface, and the cover devices for covering the guide surface are provided on both sides of the movable table. In the machine tool, from the relationship of the load current of the servo motor of the feed axis detected at different positions when the movable table moves within its stroke range, the state of chip accumulation on the cover device is detected, It is possible to automatically detect the state of accumulation of chips and other deposits on the cover device, and prevent the cover device or the feed mechanism such as the ball screw from being damaged.

The chip accumulation detecting method according to the second aspect of the present invention, which has the above-mentioned structure, relates to the load current detected in the first aspect of the present invention at the position of the machining region at the center of the stroke range and the position near the stroke end. From this, since the accumulation state of the cutting chips on the cover device is detected, there is an effect that it is possible to accurately detect the accumulation state of the cutting chips and the like on the cover device.

The chip accumulation detecting device of the third invention having the above-mentioned structure is a machine tool having a movable table which is movable on the guide surface and a cover device for covering the guide surface on both sides of the movable table. The detection means detects the degree of accumulation of chips on the cover when the movable table is located in the first area and the second area within the stroke range, and the detection means detects the accumulation degree. Based on the detected value, it is determined whether or not the amount of chips accumulated on the cover device exceeds the allowable amount. Therefore, it is possible to automatically detect the accumulated state of chips and other chips on the cover device. Alternatively, it is possible to prevent the feed mechanism such as a ball screw from being damaged.

In the chip accumulation detecting device of the fourth invention having the above-mentioned structure, in the third invention, since the load current detecting means constituting the detecting means detects the load current of the servo motor of the feed shaft, 1st within stroke range
From the relationship between the detected load current of the servomotor of the feed shaft when positioned in the area and the second area, the state of chips accumulated on the cover device is detected. It is possible to automatically detect that the cover device or the feed mechanism such as a ball screw is prevented from being damaged.

The chip accumulation detector of the fifth aspect of the present invention having the above structure is the same as the fourth aspect of the present invention, wherein the first area, which is a processing area at the center of the stroke range, and the second area, which is an area near the stroke end. When the deviation of the detection value in the area becomes equal to or more than a predetermined value, it is determined by the determining unit that the accumulation of the cutting chips of the allowable amount or more on the cover device occurs, so that the relative difference on the cover device is determined. This has the effect of being able to detect the accumulation of chips above the allowable amount.

The chip accumulation detecting device of the sixth invention having the above-mentioned structure is the same as the fourth invention, wherein the first region, which is a processing region at the center of the stroke range, and the second region, which is a region near the stroke end, are provided. When the ratio of the detected value in the area is equal to or more than a predetermined value, it is determined by the determination means that the accumulation of chips over the allowable amount on the cover device occurs, so that the relative ratio on the cover device is determined. This has the effect of being able to detect the accumulation of chips above the allowable amount.

In the chip accumulation detecting device of the seventh invention having the above-mentioned configuration, in the fourth invention, since the chip presence / absence detecting means provided in the detecting means detects the presence or absence of the cutting chips, The effect of preventing erroneous detection that the amount of cutting chips accumulated on the cover device is larger than the allowable amount when there is no light is produced.

In the chip accumulation detecting device of the eighth invention having the above structure, in the fourth invention, the strain detecting means provided in the detecting means detects the strain of the cover of the cover device, and thus the cover device. Since it is possible to detect that the cover of the cover device is distorted as a result of the accumulation of chips above the allowable amount, it is possible to prevent the cover device from being damaged.

In the chip accumulation detecting device of the ninth aspect of the present invention having the above-mentioned structure, in the fourth aspect of the present invention, since the informing means informs the accumulation of chips based on the determination result of the determining means,
It is possible to remove chips and prevent damage to the feed mechanism such as the cover device or the ball screw.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION The embodiments of the present invention will be described below.
This will be described with reference to the drawings.

(Embodiment) As shown in FIG. 1 to FIG. 4, the chip deposit detecting method and apparatus of the present embodiment is provided with a movable table 1 which is movable on a guide surface (not shown). Cover device 2 for covering the guide surface on both sides in the feeding direction of 1
In the machine tool provided with, the feed shaft is used as the detection means 3 for detecting the degree of accumulation of the chips K on the cover 20 when the movable table 1 is located in the first region and the second region within the stroke range. The load current detecting means 31 for detecting the load current of the servo motor 30 of No. 10 and whether the chips K are accumulated on the cover device 2 in an amount exceeding the allowable amount based on the detection value detected by the detecting means 3. The determination means 4 for determining whether or not the determination means 4 and the notification means 5 for notifying the accumulation of the cutting chips K based on the determination result of the determination means 4 are provided.

The feed shaft 10 is the servomotor 30.
The slide table ST, which is constituted by the ball screw 100 which is rotationally driven by this, reciprocates along the guide surface in the axial direction of the ball screw 100.

As shown in FIG. 1, the cover device 2 has one end engaged with both ends of the slide table ST so as to cover a ball screw 100 and a guide surface (not shown) extending on both sides of the slide table ST in the left-right direction. It is composed of a plurality of telescopic covers 20 which are stretchable and are stopped.

When the chip accumulation detector of the present embodiment is applied to the machining center shown in FIG. 2, the cover device 2 is a work piece machined by a machining tool T movably arranged in the front-rear direction and the up-down direction. Are arranged on both sides in the left-right direction of the slide table ST on which the slide table ST is arranged, and are constituted by a plurality of telescopic covers 20 that are extendable and retractable and have one end locked to both ends of the slide table ST so as to cover the guide surface and the ball screw. It

When the chip accumulation detecting device of this embodiment is applied to the lathe shown in FIG. 3, the cover device 2 is attached to the work W sandwiched between the headstock 101 and the tailstock 102. On the other hand, they are arranged on both sides in the left-right direction of the slide table ST on which the bite B that moves in the axial direction and the radial direction are arranged, and one end thereof is locked to one end of the slide table ST so as to cover the guide surface and the ball screw. It is composed of a plurality of telescopic covers 20 that can be expanded and contracted.

The judging means 4 is provided with a memory for temporarily storing the detected value of the load current of the servo motor 30 of the feed shaft in the first area, which is the central processing area of the stroke range.

The judgment device constituting the judgment means 4 monitors the load current of the servomotor 30 of the feed shaft and constantly acquires the position information of the slide table ST from the CNC.

When the deviation of the detected values between the first region, which is the machining region at the center of the stroke range, and the second region, which is a region near the stroke end, is greater than or equal to a predetermined value, the determination means 4 determines. Then, it is determined that the amount of the chips K accumulated on the cover device is larger than the allowable amount, and the accumulation signal is output to the notification means 5.

In the present embodiment, a chip presence / absence detecting means 6 for detecting the presence / absence of chips is further provided. The detection means 6 are provided outside the left and right stroke ends of the stroke range of the slide table ST, respectively, and collect the chips K accumulated on the outermost end portion of the outermost cover 20 of the cover device 2. The presence / absence of a predetermined amount (for example, height) or more is detected, and a detection signal is output to the determination means 4.

The control procedure of the chip accumulation detecting method and apparatus of the present embodiment having the above-mentioned configuration will be described with reference to the flow chart shown in FIG.

In step 101 of this routine, which is repeatedly executed at predetermined time intervals, the position of the slide table ST is acquired from the position information of the slide table ST from the CNC, and in step 102, the acquired slide table ST is acquired. Determine whether the position is in the center or near the end.

When the position of the slide table ST is in the central portion, in step 103, the determination value of the load current of the servo motor 30 of the feed shaft when the slide table ST is located in the central portion is determined by the judging means 4 It is temporarily stored in the memory of.

When the position of the slide table ST is near the terminal end, in step 104, the load current of the servo motor 30 of the feed shaft when the slide table ST is positioned near the terminal end is detected.

In step 105, the detected value of the load current of the servo motor 30 of the feed shaft when it is located near the end and the feed axis of the feed shaft when it is located in the central portion temporarily stored in the memory of the judging means 4. The difference from the detected value of the load current of the servo motor 30 is obtained.

In step 106, it is determined whether or not the difference between the detected value in the central portion and the detected value in the vicinity of the end exceeds a threshold value corresponding to the allowable amount of the accumulated chips K, and in step 107, it is determined. The result is sent as a deposition signal,
It ends. If the threshold is not exceeded,
The process ends without executing step 107.

In the chip accumulation detecting method and apparatus according to the present embodiment, the load current detecting means 31 constituting the detecting means 3 detects the load current of the servo motor 30 of the feed shaft. From the relationship of the detected load current of the servomotor 30 of the feed shaft when the actuator is located in the first region and the second region within the ST stroke range, the accumulation state of the chips K on the cover 20 of the cover device 2 Chip K and other cover devices 2 for detection
A cover device 2 that enables automatic detection of the deposition state on the
Alternatively, it is possible to prevent the ball screw 100 and the servomotor 30 from being damaged.

Further, in the chip accumulation detecting method and apparatus of the present embodiment, the first area (FIGS. 5A and 5C) which is a processing area at the center of the stroke range and the area near the stroke end are provided. When the deviation between the detected values in a certain second area (FIGS. 5B and 5D) becomes equal to or more than a predetermined value, the determination unit 4 determines that the amount of chips on the cover device 2 is equal to or more than the allowable amount. Since it is determined that deposition has occurred, there is an effect that it is possible to detect the deposition of cutting chips on the cover device 2 that is equal to or more than the allowable amount of the relative difference.

In the present embodiment, the center of the slide table ST (FIGS. 5A and 5 (A) and (( C)) and near the end (Fig. 5)
The determination can be made based on the detected value of the load current of the servo motor 30 at the positions (B) and (D).

That is, when the chips K are accumulated, the accumulated chips K become a resistance, and the current value becomes large at the end portion. When the difference between the current values near the center and the end of the slide table ST exceeds a threshold value, a chip accumulation signal or abnormality is transmitted, so abnormal accumulation of chips accumulated at the end of the feed shaft is prevented. This is to detect and prevent damage to the slide cover 20, the ball screw 100, and the servomotor 30.

Since chips K are accumulated on the upper portion of the slide cover 20 and hinder the feeding of the slide table ST, the machine operator is notified by informing the removal of the accumulated chips K. The chips K are removed, and as a result, the damage of the slide cover 20 can be prevented, and the chips K can be prevented from entering the ball screw portion and the slide guide surface portion due to the damage of the slide cover 20.

Further, the chip accumulation detecting device of this embodiment is
Since the presence / absence of chips is detected by the presence / absence of chips, the AND of the accumulated amount of chips is taken, so that when the chips are absent, the amount of chips exceeding the allowable amount on the cover device 2 is determined. This has the effect of preventing erroneous detection that accumulation has occurred.

Further, in the chip accumulation detecting device of the present embodiment, since the notifying means 5 notifies the abnormal accumulation of the chips K based on the judgment result of the judging means 4, the machine operator can surely remove the chips K. This makes it possible to prevent damage to the cover device 2, the ball screw 100, and the servomotor 30.

The embodiments described above are merely examples for the purpose of explanation, and the present invention is not limited to them. Those skilled in the art will recognize from the claims, the detailed description of the invention and the description of the drawings. Modifications and additions can be made without departing from the technical idea of the present invention.

In the above-described embodiment, an example in which the difference in current value between the central portion and the end portion of the feed shaft is compared with the reference value has been described as an example, but the present invention is not limited thereto. It is also possible to adopt an embodiment in which the ratio of the current values at the center and the end of the feed shaft is compared with the reference value.

In the above-described embodiment, the example in which the chip presence / absence detecting means 6 for detecting the presence / absence of chips is arranged outside the left and right stroke ends of the stroke range of the slide table ST has been described as an example. However, the present invention is not limited thereto, and an embodiment in which a load cell is attached to the end surface of the slide cover and the contact between the cutting chips and the slide cover is directly detected, or a strain gauge is attached to the slide cover, the slide cover It is also possible to employ an embodiment in which detection is performed based on the deformation of Although the telescopic cover has been described as an example, the present invention can be implemented using other types of covers such as a bellows type cover and a roll-up type cover.

[Brief description of drawings]

FIG. 1 is a block diagram showing a chip accumulation detection method and device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an example in which the chip accumulation detection device of the present embodiment is applied to a machining center.

FIG. 3 is a plan view showing an example in which the chip accumulation detection device of the present embodiment is applied to a lathe.

FIG. 4 is a chart showing a control procedure in the chip accumulation detection method and apparatus of the present embodiment.

FIG. 5 is an explanatory diagram for explaining a state of accumulated chips on the upper portion of the cover at the center portion and the end portion of the slide table in the present embodiment.

FIG. 6 is a cross-sectional view showing a conventional sliding surface protection device.

[Explanation of symbols]

1 mobile platform 2 cover device 3 detection means 4 Judgment means 5 Notification means 10 guideway 20 cover 31 Load current detection means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kiyoshi Kato             1-1 Asahi-cho, Kariya city, Aichi             Machine Co., Ltd. F-term (reference) 3C011 DD06                 3C029 EE01

Claims (9)

[Claims] 1. A machine tool provided with a movable base movable on a guide surface, and a cover device for covering the guide surface on both sides of the movable base, wherein the movable base is different when the movable base moves within its stroke range. A chip accumulation detecting method, characterized in that the chip accumulation state on the cover device is detected from the relationship of the load current of the feed shaft servo motor detected at the different position. 2. The chip accumulation according to claim 1, wherein the different positions where the load current is detected are a position of a machining region at a center of the stroke range and a position near a stroke end. Detection method. 3. A machine tool comprising a movable table movably on the guide surface and cover devices for covering the guide surface on both sides of the movable table, wherein the movable table has a first area and a first area within its stroke range. Detection means for respectively detecting the degree of accumulation of chips on the cover when positioned in two areas, and accumulation of chips above the allowable amount on the cover device based on the detection value detected by the detection means. A chip accumulation detection device, comprising: a determination unit that determines whether or not the occurrence of the above-mentioned problem has occurred. 4. The chip accumulation detection device according to claim 3, wherein the detection unit is constituted by a load current detection unit that detects a load current of the feed shaft servo motor. 5. The deviation of the detection values between the first region, which is the machining region at the center of the stroke range, and the second region, which is a region near the stroke end, of a predetermined value or more. At any one time, the chip accumulation detecting device is characterized in that the judgment means judges that the amount of chips accumulated on the cover device exceeds an allowable amount. 6. The ratio according to claim 4, wherein a ratio of detection values in the first region, which is a machining region at the center of the stroke range, and the second region, which is a region near the stroke end, is equal to or larger than a predetermined value. At any one time, the chip accumulation detecting device is characterized in that the judgment means judges that the amount of chips accumulated on the cover device exceeds an allowable amount. 7. The chip accumulation detecting device according to claim 4, wherein the detecting unit includes a chip presence / absence detecting unit for detecting presence / absence of chips. 8. The chip accumulation detection device according to claim 4, wherein the detection unit includes a strain detection unit that detects a strain of the cover of the cover device. 9. The chip accumulation detecting device according to claim 4, further comprising an informing unit for informing of the accumulation of chips based on the determination result of the determining unit.