JP2001310233A - Temperature rise monitoring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature rise monitoring device capable of preventing reciprocation of a spindle head from causing a seizure of a ball screw. SOLUTION: This temperature rise monitoring device 1 comprises a temperature rise detecting means 41 for determining temperature rise of ball screws 10 and 20 by reciprocation of the spindle head 104, a temperature range discriminating means 42 for discriminating whether or not the temperature rises are within a preset tolerance, and a stop commanding means 43 for commanding a machine tool 2 to stop the reciprocation of the spindle head 104 based on information from the temperature range discriminating means 42. If the monitoring device 1 is provided for the machine tool 2, the reciprocation of the spindle head 104 is prevented from causing the seizure of the ball screws 10 and 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature rise monitor, and more particularly, to a spindle with a working tool mounted thereon being rotatably held on a spindle head, and reciprocating the spindle head by a ball screw within a certain range. The present invention relates to a temperature rise monitoring device for monitoring a temperature rise of the ball screw in a machine tool for cutting an object.

[0002]

2. Description of the Related Art Conventionally, it is known to use a horizontal boring type machine tool 100 as shown in FIGS. 4 and 5 for cutting a relatively large object. The machine tool 100 includes a base 101 and the base 101
A table 102 movably provided in a horizontal direction,
A column 103 erected on the table 102, a spindle head 104 movably provided in the column 103 in a vertical direction, and a spindle which is rotatably provided on the spindle head 104 and has a cutting tool 105 at the tip end thereof. 106.

In such a configuration, the column 103
When the (table 102) reciprocates in the horizontal direction with respect to the base 101 and the spindle head 104 reciprocates in the vertical direction with respect to the column 103, the spindle head 104
Reciprocating in the horizontal direction and the vertical direction with respect to. When the reciprocating motion of the spindle head 104 in the horizontal and vertical directions is within a certain range, the spindle head 104 performs a constant circular motion (revolution) with respect to the base 101. In this state, when the spindle 106 held by the spindle head 104 performs a rotational motion (rotation) synchronized with a circular motion, the cutting tool 105
The turning radius of the tip is the turning radius of the circular motion due to the reciprocating motion of the spindle head 104, and the cutting tool 1 only by the rotation of the
05 and the turning radius of the tip.

Accordingly, by adjusting the range of the reciprocating motion of the spindle head 104 in the horizontal and vertical directions, and by relatively moving the object and the machine tool 100 along the longitudinal direction of the spindle 106, various boring operations can be performed. Will be able to do it. The object and the machine tool 1 are arranged along the longitudinal direction of the spindle 106.
If the range of the reciprocating movement of the spindle head 104 in the horizontal and vertical directions is adjusted while relatively moving
Since the rotation radius of the tip of the cutting tool 05 changes, it is possible to make the tip of the cutting tool 105 perform a spiral motion, and taper processing or the like can be performed.

[0005]

By the way, in the machine tool 100 as described above, the reciprocating motion of the spindle head 104 in the horizontal and vertical directions is caused by the first ball screw interposed between the base 101 and the table 102. 10 and the second ball screw 20 interposed between the column 103 and the spindle head 104. Specifically, spindle head 1
The first ball screw 10 for horizontally moving the first ball screw 04 is arranged in parallel along the horizontal direction, and a pair of feed screw shafts 11 each having both ends rotatably provided on the base 101.
And a pair of feed screw shafts 1 provided on the table 102 and
1 and a nut portion 12 screwed to each. The feed screw shaft 11 is operated by a servo motor 13. On the other hand, the second ball screw 20, which moves the spindle head 104 in the vertical direction,
A pair of feed screw shafts 21 arranged in parallel in the vertical direction and both ends of which are rotatably provided on the column 103
And a pair of feed screw shafts 21 provided on the spindle head 104 and
And a nut portion 22 screwed to each. Of these, the feed screw shaft 21 is
3 to be activated.

The machine tool 100 is provided with a drive control device 30 for controlling the servomotors 13 and 23. For example, when a worker inputs numerical values, programs, and the like to the drive control device 30, Each feed screw shaft 11,
One rotation can be desired. As a result, with the rotation of the feed screw shafts 11 and 21, the spindle head 1
04 can reciprocate within a certain range in the horizontal and vertical directions.

However, when the spindle head 104 is reciprocated for a long time in a minute range, that is, when the operating conditions of the first and second ball screws 10 and 20 are severe, the feed screw shafts 11 and 21 are not provided. The protective film such as an oil film formed in advance between the friction surfaces is broken by heat generated by friction between the first and second ball screws 10 and 20, and the first and second ball screws 10 and 20 are seized and damaged. There is a risk.

It is an object of the present invention to provide a temperature rise monitoring device which can prevent seizure of a ball screw due to reciprocating motion of a spindle head.

[0009]

The temperature rise monitoring apparatus of the present invention has the following arrangement to achieve the above object. The invention according to claim 1 is a machine tool that rotatably holds a spindle on which a machining tool is mounted on a spindle head and cuts an object while reciprocating the spindle head in a predetermined range with a ball screw. A temperature rise monitoring device for monitoring a temperature rise of a screw, wherein the temperature rise obtained by the temperature rise detection means for determining the temperature of the ball screw due to the reciprocating motion of the spindle head is determined in advance. Temperature range determining means for determining whether the temperature is within a set allowable range, and a stop command for instructing the machine tool to stop the reciprocating motion of the spindle head based on information from the temperature range determining means. Means.

The temperature rise monitoring apparatus of the present invention holds a spindle on which a machining tool is mounted so as to be rotatable around a spindle head, and cuts an object while reciprocating the spindle head by a predetermined range with a ball screw. If provided on a boring machine type machine tool or the like, seizure of the ball screw due to reciprocating motion of the spindle head can be prevented. Specifically, the temperature of the ball screw, which rises due to the reciprocating motion of the spindle head, is obtained by the rising temperature detecting means and sent to the temperature range determining means. The temperature range determining means determines whether or not the temperature is within a preset allowable range.If the temperature is within the allowable range, a signal indicating that the temperature is within the allowable range is output. A signal indicating that the signal is out of the allowable range is sent to the stop command means. In the stop command means, when the signal from the temperature range determination means is a signal within the allowable range, for example, the spindle head reciprocating motion is continued by not performing any operation, and the signal indicating that the signal is out of the allowable range. If so, the machine tool is instructed to stop the reciprocating motion of the spindle head. Therefore, if the allowable range of the temperature range determining means is set to a temperature range in which the ball screw does not seize, that is, a temperature range in which the protective film such as an oil film formed in advance on the friction surface is not broken, the ball screw is seized. Since the reciprocating motion of the spindle head can be stopped before, the seizure of the ball screw due to the reciprocating motion of the spindle head within a certain range can be prevented, and the ball screw can be prevented from being damaged due to the seizure. Also, by monitoring the temperature of the ball screw using a temperature rise monitoring device and stopping the operation when the temperature reaches a predetermined value or more, the ball screw can always be operated at a temperature equal to or lower than the predetermined value, The life of the ball screw can be extended.

According to a second aspect of the present invention, in the temperature rise monitoring apparatus according to the first aspect, the machine tool includes a base, and a first ball screw connected to the base to allow the machine tool to move between a horizontal direction and a vertical direction. A driving body provided so as to be able to reciprocate in either one direction, and a spindle head provided to the driving body so as to be able to reciprocate in either the horizontal direction or the vertical direction via a second ball screw. And wherein the temperature rise of both the first ball screw and the second ball screw is monitored.
According to this invention, for example, the driving body is provided on the base via the first ball screw so as to be able to reciprocate in the horizontal direction,
The spindle head is provided on this driving body via a second ball screw so as to be able to reciprocate vertically. This allows the spindle head to reciprocate in the horizontal and vertical directions with respect to the base. Since the temperature rise of each of the first and second ball screws for providing the spindle head to be able to reciprocate in the horizontal and vertical directions with respect to the base is monitored by the temperature rise monitoring device of the present invention,
Seizure of each of the first and second ball screws can be prevented.

According to a third aspect of the present invention, in the temperature rise monitoring device according to the first or second aspect, the rising temperature detecting means calculates a temperature rising value of the ball screw from a moving speed of the spindle head. It is characterized in that it has been calculated. According to the present invention, since the temperature rise detecting means calculates the temperature rise value of the ball screw from the moving speed of the spindle head, for example, information on the moving speed of the spindle head is obtained from the drive control device that controls the reciprocating motion of the spindle head. Then, the temperature rise value of the ball screw can be obtained. Therefore, even when the temperature rise monitoring device of the present invention is retrofitted to a machine tool, the rise temperature detection means is connected to the drive control device of the machine tool, or the program of the rise temperature detection means is added to the program of the drive control device. With an easy operation, the temperature rise monitoring device can be provided in an existing machine tool.

According to a fourth aspect of the present invention, in the temperature rise monitoring device according to the first or second aspect, the rising temperature detecting means includes a temperature sensor for detecting a temperature of the ball screw. It is characterized by having. According to the present invention, since the rising temperature detecting means is configured to include the temperature sensor for detecting the temperature of the ball screw, the actual temperature rise of the ball screw can be detected more accurately, and the burning of the ball screw can be reliably performed. Can be avoided.

According to a fifth aspect of the present invention, in the temperature rise monitoring device according to the fourth aspect, the temperature sensor is a non-contact type sensor. According to the present invention, since the temperature sensor is a non-contact type sensor such as a thermography, it is not necessary to directly install the temperature sensor on the machine tool, and it is not necessary to mount the temperature sensor on the machine tool. Can be easily done.

According to a sixth aspect of the present invention, in the temperature rise monitoring device according to the fourth or fifth aspect, the temperature sensor is provided at a predetermined interval along a longitudinal direction of a feed screw shaft of the ball screw. It is characterized in that a plurality are arranged. According to the present invention, since the plurality of temperature sensors are arranged at predetermined intervals along the longitudinal direction of the feed screw shaft, it is possible to detect the temperature of the surface of the feed screw shaft over the entire range in the longitudinal direction.

According to a seventh aspect of the present invention, in the temperature rise monitoring apparatus according to any one of the fourth to sixth aspects, the temperature sensor is connected to a feed screw shaft of the ball screw. It is characterized by being installed in a nut part of a head. According to the present invention, since the temperature sensor is provided on the nut portion screwed to the feed screw shaft, the temperature sensor moves with the movement of the nut portion.
Therefore, even when the nut portion (spindle head) is reciprocated in a minute range, a temperature rise in the minute range can be reliably detected. In addition, since the temperature sensor is arranged in the nut part, compared with the case where the temperature sensor is arranged along the longitudinal direction of the feed screw shaft, the number of temperature sensors is small, and the temperature is reduced by the reciprocating motion of the spindle head. It is possible to detect the temperature of the ball screw only at the rising position.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. First Embodiment FIG. 1 shows a temperature rise monitoring device 1 and a machine tool 2 according to a first embodiment of the present invention. Here, the machine tool 2 and the aforementioned machine tool 1
Since 00 has the same configuration and operation, the same reference numerals are given and the description thereof is omitted or simplified.

The machine tool 2 rotatably holds a spindle 106 on which a cutting tool 105 is mounted on a spindle head 104, and reciprocates the spindle head 104 by a first and second ball screws 10, 20 within a certain range to move an object. The temperature rise monitoring device 1 includes a first and second ball screws 1 that are formed by reciprocating motion of a spindle head 104 in a machine tool 2.
This is a device for monitoring a temperature rise of 0,20. The table 102 and the column 103 are the driving body of the present invention, and the cutting tool 105 is the working tool of the present invention.

The temperature rise monitoring device 1 is provided with a rise temperature detection means 41 for finding a temperature rise value θ of the first and second ball screws 10 and 20 due to the reciprocating motion of the spindle head 104, and the rise temperature detection means 41. Temperature range determining means 42 for determining whether the temperature rise value θ is within a preset allowable range, and reciprocation of the spindle head 106 with respect to the machine tool 2 based on information from the temperature range determining means 42. A stop command means 43 for commanding a stop of the movement;
And a parameter storage section 44 for storing parameters required by the temperature range determination section 42.

The rising temperature detecting means 41 is connected to the drive control device 30 of the machine tool 2 and moves the spindle head 104 sent from the drive control device 30, ie, the first and second ball screws 10 and 20. The temperature rise value θ of the first and second ball screws 10 and 20 is calculated based on the information on the feed speed. Specifically, the temperature rise detecting means 41 obtains the temperature rise value θ of the first and second ball screws 10 and 20 as follows.

When a heat quantity Q [J] is applied to the object, that is, each of the ball screws 10, 20, the temperature of each of the ball screws 10, 20 rises in inverse proportion to the heat capacity C [kJ / ° C.]. When the temperature of each of the ball screws 10 and 20 rises higher than the surrounding atmosphere, heat is lost in proportion to the temperature difference θ [° C.] and the radiation coefficient K [W / ° C.] of each of the ball screws 10 and 20. Accordingly, each ball screw 1 is moved in unit time from time t = 0 [s].
Assuming that the amount of heat supplied to each of 0 and 20 is q [J], each temperature rise value θ is represented by the following equation.

[0022]

(Equation 1)

Each ball screw 10, 20 per unit time
Is proportional to the feed speed F [mm / min] of the first and second ball screws 10 and 20, and the coefficient is G [W / (1000 mm / min)]. Then, the temperature rise value θ can be obtained by the following equation.

[0024]

(Equation 2)

Here, the heat capacity C [kJ / ° C.] of each of the ball screws 10 and 20 and the first and second ball screws 1
The parameters of the respective amounts of heat [J] supplied to 0 and 20, the respective radiation coefficients K [W / ° C.] and the respective coefficients G [W / (1000 mm / min)] of the first and second ball screws 10 and 20 are as follows. Are stored in the parameter storage unit 44 and are supplied to the rising temperature detecting means 41 as necessary. Also,
The feed rate F of the first and second ball screws 10, 20 is
It is supplied from the drive control device 30.

The temperature rise value θ calculated by the rise temperature detecting means 41 is sent to the temperature range judging means 42 to judge whether or not the value is within a preset allowable range. Here, the allowable range of the temperature range judging means 42 is a temperature range in which the first and second ball screws 10 and 20 are not seized, that is, a temperature range in which a protective film such as an oil film formed in advance on the friction surface is not broken. Just set it. The parameters in the allowable range set in this way are stored in the parameter storage unit 44, and are supplied to the temperature range determination unit 42 as needed. The temperature range determination means 42 sends a signal indicating that the temperature rise value θ is within the allowable range to the stop command means 43 if the temperature rise value θ is within the allowable range, and outputs a signal indicating that the temperature rise value θ is out of the allowable range if the temperature rise value θ is outside the allowable range. Send to 43.
In the stop command means 43, if the signal from the temperature range determination means 42 is within the allowable range, the reciprocating motion of the spindle head 104 is continued by, for example, not performing any operation. If the signal indicates that there is, the command is issued to the drive control device 30 of the machine tool 2 to stop the reciprocation of the spindle head 104.

Next, the operation of the present embodiment will be described with reference to the flowchart shown in FIG. First, the power supply of the temperature rise monitoring device 1 is turned on in the first step ST1, and the temperature rise value θ of the ball screws 10, 20 is obtained by the rise temperature detection means 41 in the second step ST2. Next, in a third step ST3, the temperature range determination means 42 determines whether or not the temperature rise value θ obtained by the temperature rise detection means 41 is within a preset range. The temperature range determination means 42
If the temperature rise value θ is within the range, a signal indicating that the temperature rise value is within the range is output to the stop command means 43 (fourth step ST4),
If the temperature rise value θ is out of the range, a signal indicating that the temperature rise value is out of the range is output to the stop command means 43 (fifth step ST).
5). After sending the signal to the stop command means 43, if the power supply of the temperature rise monitoring device 1 is not turned off, the process returns to the second step ST2 and repeats the steps ST2 to ST6. On the other hand, upon receiving the out-of-range signal, the stop command means 43 sends a stop command such as feed hold, cycle stop, or emergency stop to the drive control device 30.
The reciprocating motion of the spindle head 104 of the machine tool 2 by the ball screws 10 and 20 is stopped. Thereby, the ball screw 1
Heat generation of 0, 20 can be suppressed, and each ball screw 10, 20 can always be operated at a temperature equal to or lower than a predetermined value.

According to the above-described embodiment, the following effects can be obtained. (1) The temperature rise monitoring device 1 holds the spindle 106 on which the cutting tool 105 is mounted rotatably on the spindle head 104, and reciprocates the spindle head 104 by a first and second ball screws 10 and 20 in a certain range. By providing the machine tool 2 for cutting an object, seizure of the first and second ball screws 10 and 20 due to the reciprocating motion of the spindle head 104 can be prevented.
Specifically, when the temperature of the first and second ball screws 10 and 20 rises due to the reciprocating motion of the spindle head 104, the temperature rise value θ is obtained by the rise temperature detection means 41 and sent to the temperature range determination means 42. . Temperature range determination means 4
2 determines whether or not the temperature rise value θ is within a preset allowable range. If the temperature rise value θ is within the allowable range, a signal indicating that the temperature rise value θ is within the allowable range. A signal indicating that the signal is out of the allowable range is sent to the stop command means 43. In the stop command means 43, the temperature range determination means 42
If the signal is out of the allowable range, the reciprocating motion of the spindle head 104 is continued by not performing any operation. If the signal is out of the allowable range, the drive control is performed. It instructs the device 30 to stop the reciprocating motion of the spindle head 104. The allowable range of the temperature range judging means 42 is set to such a temperature range that the first and second ball screws 10 and 20 are not seized, that is, a temperature range in which the protective film such as an oil film formed on the friction surface is not broken. Because
The reciprocating motion of the spindle head 104 can be stopped before the first and second ball screws 10, 20 are seized. Therefore, seizure of the first and second ball screws 10, 20 due to the reciprocating motion of the spindle head 104 within a certain range can be prevented, and breakage of the first and second ball screws 10, 20 due to seizure can be prevented. In addition, the temperature of the first and second ball screws 10 and 20 is monitored using the temperature rise monitoring device 1, and the operation is stopped when the temperature becomes equal to or higher than a predetermined value.
Always keep the first and second ball screws 1 at a temperature below a predetermined value.
0, 20 can be operated, and the life of the first and second ball screws 10, 20 can be extended.

(2) The first ball screw 10 is
The table 102 and the column 103 are provided so as to be able to reciprocate in the horizontal direction via a shaft. The spindle head 104 is provided in the column 103 via the second ball screw 20 so as to be able to reciprocate in the vertical direction. Thereby, the spindle head 104 can reciprocate in the horizontal direction and the vertical direction with respect to the base 101. In the first and second ball screws 10 and 20 for providing the spindle head 104 so as to be able to reciprocate in the horizontal and vertical directions with respect to the base 101, the temperature rise monitoring device 1 monitors the respective temperature rises.
, The first and second ball screws 10,
20 can be prevented from burning.

(3) The rising temperature detecting means 41
From the moving speed F of the first and second ball screws 10, 2
Is calculated from the drive control device 30 that controls the reciprocating motion of the spindle head 104,
, The temperature rise value θ of the first and second ball screws 10 and 20 can be obtained. Even when the temperature rise monitoring device 1 is retrofitted to the machine tool 2, the rise temperature detection means 41 is connected to the drive control device 30 of the machine tool 2, or the calculation program of the rise temperature detection means 41 is added to the program of the drive control device 30. The temperature rise monitoring device 1 can be provided in the existing machine tool 2 by an easy operation such as adding.

[Second Embodiment] FIG. 3 shows a second embodiment of the present invention.
The main part of the temperature rise monitoring device according to the embodiment is shown. Here, the present embodiment is different from the above-described first embodiment only in the method of obtaining the temperature rise value of the ball screw.
Since other configurations and operations are the same, the same reference numerals are given and their description is omitted or simplified.

The rising temperature detecting means includes a temperature sensor 41 for directly detecting the temperatures of the first and second ball screws 10 and 20.
1 is included. In addition, what used the thermocouple etc. should just be used for the temperature sensor 411, for example.
Temperature sensor 411 for detecting the temperature of first ball screw 10
As shown in FIG. 3B, a plurality of are arranged on the table 102 at predetermined intervals along the longitudinal direction of the feed screw shaft 11. The temperature sensor 411 for detecting the temperature of the second ball screw 20 is connected to the column 103 as shown in FIG.
Are arranged at predetermined intervals along the longitudinal direction of the feed screw shaft 21.

The temperature state value (analog amount of the temperature value θ2) of each of the ball screws 10 and 20 detected by the plurality of temperature sensors 411 is amplified and digitally converted by an A / D converter (not shown). Is sent to the temperature range determining means. Then, the temperature range determination unit determines whether the temperature value θ2 detected by each of the temperature sensors 411 is within the preset allowable range, and stops the signal within the allowable range if the temperature value θ2 is within the allowable range. The signal is sent to the command means, and if it is outside the allowable range, a signal outside the allowable range is sent to the stop command means. If the signal from the temperature range determination means is a signal within the allowable range, the stop command means causes the spindle head 104 to continue reciprocating motion by not performing any operation, and if the signal is out of the allowable range, the machine tool The second drive control device is instructed to stop the reciprocation of the spindle head 104.

According to the present embodiment as described above, the following effects are obtained in addition to the effects (1) and (2) of the first embodiment. (4) Since the temperature increase detecting means 41 is configured to include the temperature sensor 411 for detecting the temperature of the first and second ball screws 10 and 20, the actual temperature increase of the ball screws 10 and 20 can be more accurately detected. Can be detected, ball screw 10, 20
Can reliably be avoided.

(5) The temperature sensor 411 is the feed screw shaft 1
Since the plurality of feed screw shafts 11 and 21 are arranged at predetermined intervals along the longitudinal direction, the surface temperature of the feed screw shafts 11 and 21 can be detected over the entire range in the longitudinal direction.

The present invention is not limited to the above embodiments, but includes modifications and improvements as long as the object of the present invention can be achieved. For example,
In the second embodiment, the temperature sensor 411 is
The temperature sensor according to the present invention is not limited to this, but is provided along the longitudinal direction of the table 102 and the nut 102 of the spindle head 104 as shown by a two-dot chain line in FIG. The temperature sensors 412 provided in each of the sensors 12 and 22 may be used. In such a case, the following effects are obtained in addition to the effects (1), (2), and (4) of the second embodiment. Nut part 1 for temperature sensor 412
2 and 22, the number of temperature sensors 412 is smaller and the number of spindle heads 1 is smaller than when temperature sensors 411 are arranged in the longitudinal direction of feed screw shafts 11 and 12.
The temperature of each of the ball screws 10 and 20 can be detected only at the location where the temperature is increased by the reciprocating motion of the ball screw 04.

The temperature sensor is not limited to the contact type, but may be a non-contact type such as thermography. In such a case, the following effects are obtained in addition to the effects (1), (2), and (4) of the second embodiment. Since the temperature sensor is a non-contact type sensor such as a thermography, it is not necessary to directly install the temperature sensor on the machine tool, so that there is no need to mount the temperature sensor on the machine tool, and the temperature sensor can be easily installed.

In each of the above-described embodiments, the drive control device 30 of the machine tool 2 and the temperature rise monitoring device 1 are configured separately, but these are not limited to separate devices but are configured by one computer. You may.

In each of the above embodiments, the direction of the reciprocating motion of the spindle head 104 is the horizontal direction and the vertical direction. However, for example, it may be only the horizontal direction or only the vertical direction. The direction may be any direction as long as the reciprocating motion is within a certain range.

[0040]

According to the temperature rise monitoring device of the present invention, the temperature rise of the ball screw accompanying the reciprocating motion of the spindle head is monitored, and when the temperature rise exceeds an allowable range, the reciprocating motion of the machine tool is performed. Has the effect that seizure of the ball screw due to the reciprocating motion of the spindle head can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a temperature rise monitoring device according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation performed by the temperature rise monitoring device of the embodiment.

FIG. 3 is a diagram showing a main part of a temperature rise monitoring device according to a second embodiment of the present invention.

FIG. 4 is a front view showing a conventional machine tool.

FIG. 5 is a plan view showing a conventional machine tool.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Temperature rise monitoring apparatus 2 Machine tool 10, 20 Ball screw 11, 21 Feed screw shaft 12, 22 Nut part 41 Rise temperature detection means 42 Temperature range judgment means 43 Stop command means 411, 412 Temperature sensor 105 Tool bit 106 as a processing tool Spindle 104 Spindle head θ Temperature rise value F Moving speed

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takashi Mizutani 2068-3 Ooka, Numazu-shi, Shizuoka Prefecture F-term (reference) in Numazu Office of Toshiba Machine Co., Ltd. 3C011 AA14

Claims (7)

[Claims] 1. A machine tool for rotatably holding a spindle on which a machining tool is mounted on a spindle head, and cutting an object while reciprocating the spindle head by a predetermined range with a ball screw. A temperature rise monitoring device for monitoring the temperature of the ball screw due to the reciprocating motion of the spindle head, and an allowable range in which the temperature obtained by the temperature rise detection device is set in advance. Temperature range determining means for determining whether the temperature is within the range, and stop command means for instructing the machine tool to stop the reciprocating motion of the spindle head based on information from the temperature range determining means. A temperature rise monitoring device characterized in that: 2. The temperature rise monitoring device according to claim 1, wherein the machine tool reciprocates in a horizontal direction or a vertical direction through a base and a first ball screw. A driving body provided to be movable;
The driving body includes a spindle head provided so as to be able to reciprocate in either the horizontal direction or the vertical direction via a second ball screw. A temperature rise monitoring device that monitors both rise temperatures. 3. The temperature rise monitoring device according to claim 1, wherein the temperature rise detecting means calculates a temperature rise value of the ball screw from a moving speed of the spindle head. Temperature rise monitoring device. 4. The temperature rise monitoring device according to claim 1, wherein the temperature rise detecting means includes a temperature sensor for detecting a temperature of the ball screw. Temperature rise monitor. 5. The temperature rise monitoring device according to claim 4, wherein the temperature sensor is a non-contact type sensor. 6. The temperature rise monitoring device according to claim 4, wherein a plurality of the temperature sensors are arranged at predetermined intervals along a longitudinal direction of a feed screw shaft of the ball screw. Characteristic temperature rise monitoring device. 7. The temperature rise monitoring device according to claim 4, wherein the temperature sensor is installed on a nut portion of the spindle head screwed to a feed screw shaft of the ball screw. A temperature rise monitoring device characterized in that: