KR102697471B1 - Internal pressure measuring device and measuring method for spindle of machine tool - Google Patents

Abstract

The present invention relates to a spindle internal pressure measuring device and a measuring method for a machine tool, and can be configured to include 000. According to the present invention, it is possible to quantitatively calculate, through a pressure gauge, whether the internal pressure of the spindle is relatively negative or positive compared to atmospheric pressure, and the measurement results can be digitized, so that the relationship between the degree of wear/damage of the labyrinth structure of the spindle and the change in the internal pressure of the spindle can be quantified and parameterized. Ultimately, it is possible to increase efficiency in long-term maintenance/repair management of machine tools.

Description

{Internal pressure measuring device and measuring method for spindle of machine tool}

The present invention relates to a spindle internal pressure measuring device and a measuring method for a machine tool, and more specifically, to a spindle internal pressure measuring device and a measuring method for a machine tool, which determine the degree of wear/damage of a labyrinth of a spindle and measure the internal pressure of the spindle to determine whether the spindle is operating at positive or negative pressure, thereby judging the operating state of the spindle.

In general, machine tools are a general term for mechanical devices that process materials into shapes desired by workers. Recently, NC (Numerical Control) machine tools are mainly used, which refer to automatic mechanical devices that process materials into various shapes based on various numerical information input. These machine tools come in various forms.

As an example, Fig. 1a illustrates a form of a spindle (9) and a spindle head (8) of a machine tool that are arranged horizontally to rotate a material and process it, and Fig. 1b illustrates a form of a spindle (9) and a spindle head (8) of a machine tool that are arranged vertically to rotate a material and process it.

In order for these machine tools to perform machining operations smoothly, cutting oil must be supplied to the spindle's material mounting section so that the front end of the spindle is cooled, and foreign substances such as cutting chips must fall and be discharged together with the cutting oil.

However, cutting oil can flow into the spindle of a machine tool during machining, causing problems such as damage to the spindle bearings.

To solve these problems, a structure such as a labyrinth is formed between the spindle and the spindle head during the design process of the machine tool to prevent leakage of the lubrication system and the inflow of cutting oil into the spindle.

However, the labyrinth structure may become worn/damaged due to long-term use of the spindle or unexpected impact or malfunction, and in this case, the internal pressure of the spindle may be formed as a relative negative pressure lower than the atmospheric pressure.

In this case, external air, foreign substances, etc. may flow into the spindle, causing damage to the equipment, or cutting oil may not be discharged and may flow back into the spindle, causing problems such as damage to the spindle bearings.

Therefore, in order to identify in advance any problems of the spindle that may occur in the future due to changes in the internal pressure of the spindle caused by damage to the labyrinth structure of the spindle, the internal pressure of the spindle was measured as in the method disclosed in Fig. 2.

That is, when the spindle (9) that is arranged to rotate on the spindle head (8) is sealed with a bag (1) using tape and the spindle (9) is operated, it is determined that when the bag (1) contracts, the internal pressure of the spindle (9) is negative compared to the atmospheric pressure, and conversely, when the bag (1) expands, the internal pressure of the spindle (9) is positive compared to the atmospheric pressure.

In the case of this measurement method, only the phenomenon of internal pressure of the main shaft can be judged, and there is a limitation in that quantitative figures cannot be known, so data on the measurement results cannot be converted into data.

The present invention has been made to solve the problems in the related technical field as described above, and the purpose of the present invention is to provide a spindle internal pressure measuring device and measuring method for a machine tool, which determine the operating state of a spindle by determining the degree of wear/damage of a labyrinth of a spindle and measuring the internal pressure of the spindle to determine whether the spindle is operating at positive or negative pressure.

In order to achieve the above objects, the present invention relates to a method for measuring the internal pressure of a spindle of a machine tool, which may include the steps of: determining the structure of a spindle and the labyrinth structure of the spindle; determining a measurement portion for the labyrinth of the spindle and measuring a numerical value of each measurement portion; determining whether measurement of the internal pressure of the spindle is necessary; installing a spindle pressure measuring device and measuring the internal pressure of the spindle; and determining whether the measured internal pressure is positive/negative.

In addition, in an embodiment of the present invention, the step of measuring the internal pressure of the spindle may measure the internal pressure of the spindle by driving the spindle for a set time at a set ratio RPM compared to the maximum RPM.

In addition, in an embodiment of the present invention, the step of measuring the internal pressure of the spindle may measure the internal pressure of the spindle by driving the spindle at a set change ratio RPM interval compared to the maximum RPM for a set time interval.

In addition, in an embodiment of the present invention, after the step of determining a measurement portion for a labyrinth of a main axis and measuring a numerical value of each measurement portion, the step of comparing the measured numerical value of each portion of the labyrinth of the main axis with a preset reference range value of the main axis internal pressure measurement may be further included.

In addition, in an embodiment of the present invention, after the step of determining whether the measured internal pressure is positive/negative pressure, the step of verifying whether the measured internal pressure is positive/negative pressure is consistent with a preset main axis positive/negative pressure generation reference range value may be further included.

In addition, in an embodiment of the present invention, in a step of verifying whether the measured positive/negative pressure generation matches the positive/negative pressure generation reference range value of the preset main axis, if they do not match, the step of measuring the internal pressure of the main axis can be repeated.

In addition, in an embodiment of the present invention, in a step of verifying whether the measured positive/negative pressure generation matches the preset positive/negative pressure generation reference range value of the main axis, if they do not match, a step of determining whether the number of times (N) of internal pressure measurements of the main axis is N+1 may be further included.

The spindle internal pressure measuring device of the machine tool of the present invention may include: a device housing having an insertion portion formed into which a front end of the spindle is inserted; a sealing portion arranged along an outer circumference of the insertion portion and configured to seal the front end of the spindle; and a pressure measuring unit arranged in the device housing and configured to measure the internal pressure of the spindle.

In addition, in an embodiment of the present invention, the pressure measuring unit includes an internal pressure gauge that measures the internal pressure of the device housing and measures the internal pressure of the main shaft inserted into the insertion portion; and an external pressure gauge that measures the external pressure of the device housing; wherein, by comparing the numerical value of the internal pressure gauge with the numerical value of the external pressure gauge, it is possible to determine whether the internal pressure of the main shaft is relatively positive or negative with respect to the external pressure.

According to the present invention, it is possible to quantitatively calculate whether the internal pressure of the main shaft is negative or positive relative to atmospheric pressure using a pressure gauge.

And since these measurement results can be digitized, the relationship between the degree of wear/damage of the labyrinth structure of the spindle and the change in internal pressure of the spindle can be quantified and parameterized.

Ultimately, it will increase efficiency in long-term maintenance and management of machine tools.

Figures 1a and 1b are drawings showing various structures of a machine tool spindle.
Figure 2 is a drawing showing a conventional method of measuring internal pressure of a spindle.
Figure 3 is a drawing showing the labyrinth structure of the spindle and the groove structure of the spindle head.
Figure 4 is a drawing showing a state in which the pressure measuring device of the present invention is mounted on the front end of the main shaft.
Figure 5 is a perspective view showing the pressure measuring device of the present invention.
Figure 6 is a flow chart showing a first embodiment of a method for measuring the internal pressure of a main shaft of a machine tool according to the present invention.
Figure 7 is a flow chart showing a second embodiment of a method for measuring the internal pressure of a main shaft of a machine tool according to the present invention.

Hereinafter, preferred embodiments of a spindle internal pressure measuring device and measuring method of a machine tool according to the present invention will be described in detail with reference to the attached drawings.

FIG. 3 is a drawing showing the labyrinth structure of the spindle and the groove structure of the spindle head, FIG. 4 is a drawing showing a state where the pressure measuring device (10) of the present invention is mounted on the front end of the spindle, FIG. 5 is a perspective view showing the pressure measuring device (10) of the present invention, FIG. 6 is a flow chart showing a first embodiment of a method for measuring the internal pressure of a spindle of a machine tool according to the present invention, and FIG. 7 is a flow chart showing a second embodiment of a method for measuring the internal pressure of a spindle of a machine tool according to the present invention.

First, referring to FIGS. 4 and 5, the main shaft internal pressure measuring device (10) of the machine tool of the present invention can be configured to include a device housing (11), a sealing part (12), and a pressure measuring unit (16).

The above device housing (11) has an insertion portion (13) formed on the upper surface into which the front end of the main shaft, i.e. the portion where the workpiece is mounted, is inserted, and may be configured in the shape of a rectangular parallelepiped overall. However, it is not necessarily limited to the above shape.

The interior of the above device housing (11) may be an empty space, and may be a space where air discharged or sucked in from the main shaft inserted into the insertion portion (13) may remain.

And the sealing portion (12) may be arranged along the outer circumference of the insert portion (13) and configured to seal the front end of the main shaft.

When the spindle is inserted into the above insertion portion (13), the outer circumference of the spindle is in close contact with the sealing portion (12), so the front end of the spindle and the outside of the spindle are separated.

The above sealing portion (12) may be made of rubber or silicone with tight sealing properties or other elastic and ductile materials.

The following pressure measuring unit (16) is placed in the device housing (11) and can be configured to measure the internal pressure of the main shaft.

The pressure measuring unit (16) may be configured to include an internal pressure gauge (14) that measures the internal pressure of the device housing (11) and the internal pressure of the main shaft inserted into the insertion portion (13), and an external pressure gauge (15) that measures the external pressure of the device housing (11).

Here, the worker can compare the numerical value of the internal pressure gauge (14) with the numerical value of the external pressure gauge (15) to determine whether the internal pressure of the main shaft is positive or negative relative to the external pressure, i.e., atmospheric pressure.

Next, referring to FIG. 6, a first embodiment of a method for measuring the internal pressure of a main shaft of a machine tool according to the present invention is disclosed.

Referring to FIG. 6, the first embodiment of the method for measuring internal pressure of a spindle of a machine tool according to the present invention may be configured to include a step (S11) of determining a structure of a spindle and a labyrinth structure of the spindle, a step (S12) of determining a measurement portion for the labyrinth of the spindle and measuring a numerical value of each measurement portion, a step (S13) of determining whether measurement of the internal pressure of the spindle is necessary, a step (S14, 15) of installing an internal pressure measurement device (10) of the spindle and measuring the internal pressure of the spindle, a step (S16) of determining whether the measured internal pressure is positive/negative, and a step (S17) of determining whether the number of times (N) of measuring the internal pressure of the spindle is N+1.

First, the step (S11) of determining the structure of the spindle and the labyrinth structure of the spindle may be a step of determining the structure and shape of the spindle of a machine tool having various structures, such as the spindle structure of the machine tool disclosed in FIG. 1a and FIG. 1b.

And each of these axes, implemented in various forms, consists of a labyrinth structure with a different structure.

Referring to FIG. 3 here, one form of a labyrinth structure of a spindle is illustrated. A projection (7) constituting a labyrinth may be arranged on the outer surface of the spindle (9), and a groove (5) into which the projection (7) is inserted may be formed in the spindle head (8) into which the spindle (9) is inserted and arranged. Of course, other labyrinth structures may be implemented in other spindles, and the present invention will be described only with respect to the labyrinth structure disclosed in FIG. 3.

That is, this step (S11) may be a step of distinguishing various types of spindles and identifying the labyrinth structure of the corresponding spindles.

Next, the step (S12) of determining the measurement site for the labyrinth of the above-mentioned main axis and measuring the numerical value of each measurement site will be explained through Fig. 3.

Assuming that outside air (A) flows in through a flow space (4a) that is connected to the front end of the spindle and forms a gap (h), passes through a groove (5) that forms a certain depth (H), and flows into a flow space (Ab) that forms a gap (h) connected to the rear end of the spindle, the worker can determine the change in the internal pressure of the spindle by the change in the size of the space formed between the protrusion (7) and the groove (5).

That is, depending on the rotational operation of the main shaft (9), the protrusion (7) may be worn/damaged, and accordingly, the gap (C1, C2, C3) between the protrusion (7) and the groove (5) or the width (B) of the protrusion (7) may change.

Here, the worker determines that the change in the gap (C1, C3) and the width (B) of the protrusion (7) affects the inflow of outside air (A), and the measurement target in the labyrinth structure can be determined as the gap (C1, C3) and the width (B) of the protrusion (7).

This is because, as the protrusion (7) rotates, a flow due to centrifugal force occurs in the space (6a, 6b) formed by the two sides of the protrusion (7) and the inner surface of the groove (5), thereby preventing the outside air (A) from flowing from the space (4a) to the space (4b). Accordingly, the change in the gap (C1, C3) and the width (B) of the protrusion (7) can be an important factor in preventing the inflow of outside air by causing the flow to occur.

That is, this step (S12) may be a step of determining the target area to be measured in the labyrinth structure of the main axis and actually measuring it.

Next, the step (S13) for determining whether measurement of the internal pressure of the spindle is necessary is a step for determining that there is no need to measure the internal pressure of the spindle if, as a result of measuring the spacing (C1, C3) of the labyrinth structure of the spindle and the width (B) of the protrusion (7), there is little wear or damage to the protrusion (7), for example, there is only a numerical change of less than 3% compared to the initial design specifications. In this case, the measurement step is not performed any further, and the measurement of the internal pressure of the spindle is completed.

On the other hand, if the wear or damage of the protrusion (7) is significant, for example, if a change of 3 to 5% or more occurs compared to the initial design specifications, it is necessary to measure the internal pressure of the main shaft to determine whether the current internal pressure of the main shaft is maintained in a positive or negative pressure state relative to the external pressure, i.e., atmospheric pressure.

Next, the step (S14, 15) of installing the internal pressure measuring device (10) of the spindle and measuring the internal pressure of the spindle may be a step of mounting the internal pressure measuring device (10) on the front end of the spindle as in Fig. 4, operating the spindle, and measuring the internal pressure of the spindle through the pressure measuring unit (16).

At this time, the spindle is driven for a set time at a set RPM ratio change relative to the maximum RPM. For example, the spindle pressure can be measured for 30 minutes while changing the speed in units of 25% RPM ratio relative to the maximum RPM.

In other words, the internal pressure of the spindle can be measured for 30 minutes each at a 25% RPM ratio compared to the maximum RPM for the first measurement, a 50% RPM ratio compared to the maximum RPM for the next measurement, a 75% RPM ratio compared to the maximum RPM, a 25% RPM ratio compared to the maximum RPM, and a 100% RPM ratio compared to the maximum RPM for the subsequent measurements. Of course, it is not limited to this.

Next, the step (S16) of determining whether the measured internal pressure is positive/negative may be a step of determining whether the internal pressure of the main shaft as a result of the measurement is a positive pressure that is relatively higher than the external pressure, i.e., atmospheric pressure, or whether the internal pressure of the main shaft as a negative pressure that is relatively lower than the external pressure.

If the measurement result is judged to be negative pressure, the measurement site for the labyrinth of the main axis is determined and the step (S12) of measuring the numerical value of each measurement site is returned to repeatedly measure the internal pressure of the main axis.

In other words, reliability is increased by repeating measurements.

Here, the step (S17) of determining whether the number of times (N) of internal pressure measurement of the main axis is N+1 may be a step of setting the number of times of measurement limitation (N) since the measurement cannot be repeated infinitely after detection as negative pressure. For example, if detection as negative pressure is made and the number of measurements is limited to 2, then N=2, and if it becomes N+1 in the algorithm, the repeated measurement is stopped and the measurement procedure is completed.

If the measurement result is judged to be positive pressure, the labyrinth structure of the main shaft is in good condition, so the measurement procedure is completed.

Meanwhile, referring to FIG. 7, a second embodiment of a method for measuring the internal pressure of a main shaft of a machine tool according to the present invention is disclosed.

Referring to FIG. 7, in the second embodiment of the spindle internal pressure measurement method of the machine tool of the present invention, the steps of determining the spindle structure and the spindle labyrinth structure (S21), determining the measurement portion for the spindle labyrinth and measuring the numerical value of each measurement portion (S22), comparing the numerical value of each portion of the measured spindle labyrinth with the preset reference range value of the spindle internal pressure measurement (S23), determining whether measurement of the spindle internal pressure is necessary (S24), installing the spindle internal pressure measurement device (10) and measuring the spindle internal pressure (S25, 26), determining whether the measured internal pressure is positive/negative (S27), verifying whether the measured internal pressure is positive/negative by comparing it with the preset reference range value of the positive/negative pressure generation of the spindle and whether the measured internal pressure is positive/negative is consistent (S28), and determining whether the number of times (N) of the spindle internal pressure measurement limit is N+1. It can be configured to include a judging step (S29).

First, the step (S21) of determining the structure of the spindle and the labyrinth structure of the spindle may be a step of determining the structure and shape of the spindle of a machine tool having various structures, such as the spindle structure of the machine tool disclosed in FIG. 1a and FIG. 1b.

And each of these axes, implemented in various forms, consists of a labyrinth structure with a different structure.

Referring to FIG. 3 here, one form of a labyrinth structure of a spindle is illustrated. A projection (7) constituting a labyrinth may be arranged on the outer surface of the spindle (9), and a groove (5) into which the projection (7) is inserted may be formed in the spindle head (8) into which the spindle (9) is inserted and arranged. Of course, other labyrinth structures may be implemented in other spindles, and the present invention will be described only with respect to the labyrinth structure disclosed in FIG. 3.

In other words, this step (S21) may be a step of distinguishing various types of spindles and identifying the labyrinth structure of the spindles.

Next, the step (S22) of determining the measurement site for the labyrinth of the above-mentioned main axis and measuring the numerical value of each measurement site will be explained through Fig. 3.

Assuming that outside air (A) flows in through a flow space (4a) that is connected to the front end of the spindle and forms a gap (h), passes through a groove (5) that forms a certain depth (H), and flows into a flow space (Ab) that forms a gap (h) connected to the rear end of the spindle, the worker can determine the change in the internal pressure of the spindle by the change in the size of the space formed between the protrusion (7) and the groove (5).

That is, depending on the rotational operation of the main shaft (9), the projection (7) may be worn/damaged, and accordingly, the gap (C1, C2, C3) between the projection (7) and the groove (5) or the width (B) of the projection (7) may change.

Here, the worker determines that the change in the gap (C1, C3) and the width (B) of the protrusion (7) affects the inflow of outside air (A), and the measurement target in the labyrinth structure can be determined as the gap (C1, C3) and the width (B) of the protrusion (7).

This is because, as the protrusion (7) rotates, a flow due to centrifugal force occurs in the space (6a, 6b) formed by the two sides of the protrusion (7) and the inner surface of the groove (5), thereby preventing the outside air (A) from flowing from the space (4a) to the space (4b). Accordingly, the change in the gap (C1, C3) and the width (B) of the protrusion (7) can be an important factor in preventing the inflow of outside air by causing the flow to occur.

That is, this step (S22) may be a step of determining the target area to be measured in the labyrinth structure of the main axis and actually measuring it.

Next, the step (S23) of comparing the numerical values of each part of the labyrinth of the measured main axis with the standard range value of the main axis internal pressure measurement set above may be a step of comparing the changed numerical values of the measured labyrinth spacing (C1, C2) and the width (B) of the protrusion (7) with the standard range value set as the standard change value of the main axis internal pressure measurement during the initial design process or a future design to see whether or not it exceeds the standard range value.

For example, if the reference range value is set to 3 to 5% of the initial design specifications for the gap (C1, C2) and the width (B) of the protrusion (7), the measured numerical values for the gap (C1, C2) and the width (B) of the protrusion (7) are compared to see whether they exceed the reference range value.

Next, the step (S24) for determining whether measurement of the internal pressure of the spindle is necessary is a step for determining that there is no need to measure the internal pressure of the spindle if, as a result of measuring the spacing (C1, C3) of the labyrinth structure of the spindle and the width (B) of the protrusion (7), there is little wear or damage to the protrusion (7), for example, there is only a numerical change of 3% or less of the above-described standard range value. In this case, the measurement step is not performed any further, and the measurement of the internal pressure of the spindle is completed.

On the other hand, if the wear or damage of the protrusion (7) is significant, for example, a change of value exceeding 3 to 5% compared to the standard range value occurs, it is necessary to measure the internal pressure of the main shaft to determine whether the current internal pressure of the main shaft is maintained in a positive pressure state or a negative pressure state relative to the external pressure, i.e., atmospheric pressure.

Next, the step (S25, 26) of installing the internal pressure measuring device (10) of the main shaft and measuring the internal pressure of the main shaft may be a step of mounting the internal pressure measuring device (10) on the front end of the main shaft, operating the main shaft, and measuring the internal pressure of the main shaft through the pressure measuring unit (16), as shown in FIG. 4.

At this time, the spindle is driven for a set time at a set RPM ratio change relative to the maximum RPM. For example, the spindle pressure can be measured for 30 minutes while changing the speed in units of 25% RPM ratio relative to the maximum RPM.

In other words, the internal pressure of the spindle can be measured for 30 minutes each at a 25% RPM ratio compared to the maximum RPM for the first measurement, a 50% RPM ratio compared to the maximum RPM for the next measurement, a 75% RPM ratio compared to the maximum RPM, a 25% RPM ratio compared to the maximum RPM, and a 100% RPM ratio compared to the maximum RPM for the subsequent measurements. Of course, it is not limited to this.

Next, the step (S27) of determining whether the measured internal pressure is positive/negative may be a step of determining whether the measured internal pressure of the main shaft comes out as a positive pressure that is relatively higher than the external pressure, i.e., atmospheric pressure, or whether the measured internal pressure of the main shaft comes out as a negative pressure that is relatively lower than the external pressure.

Next, the step (S28) of verifying whether the measured positive/negative pressure generation matches the positive/negative pressure generation standard range value of the set main axis may be a step of verifying whether the positive/negative pressure generation according to the changed numerical values of the measured labyrinth spacing (C1, C2) and the width (B) of the protrusion (7) actually matches the standard range value set as the standard range value of the main axis positive/negative pressure generation in the initial design process or a later design, thereby verifying whether the positive or negative pressure is generated.

For example, if the positive pressure generation criterion range value is set to less than 3% of the initial design specifications of the gap (C1, C2) and the width (B) of the protrusion (7), when the measured numerical values of the gap (C1, C2) and the width (B) of the protrusion (7) are less than 3%, it is verified whether the internal pressure of the main shaft is measured as positive pressure.

Conversely, if the negative pressure generation criterion range value is set to 3 to 5% or more of the initial design specifications of the gap (C1, C2) and the width (B) of the protrusion (7), it is verified whether the internal pressure of the main shaft is measured as negative pressure when the measured numerical values of the gap (C1, C2) and the width (B) of the protrusion (7) are 3 to 5% or more.

If the opposite is verified, it is necessary to re-measure the internal pressure of the spindle, as this is different from the positive/negative pressure generation standard value of the spindle.

Here, if the measurement results do not match, the measurement site for the labyrinth of the main axis is determined, and the step (S22) is returned to measure the numerical value of each measurement site, and the internal pressure of the main axis is repeatedly measured.

In other words, reliability is increased by repeating measurements.

Here, the step (S29) of determining whether the number of times (N) for measuring the internal pressure of the main axis is N+1 may be a step of setting the number of times (N) for measuring, since the measurement cannot be repeated infinitely after detection as negative pressure. For example, if detection as negative pressure is made and the number of times for measuring is limited to 2, then N=2, and if it becomes N+1 in the algorithm, the repeated measurement is stopped and the measurement procedure is completed.

If the measurement results are consistent, the verification is consistent and the measurement procedure is completed.

The present invention can quantitatively calculate, through a pressure gauge, whether the internal pressure of a spindle is relatively negative or positive compared to atmospheric pressure through the above-mentioned measuring method, and can digitize the measurement results, so that the relationship between the degree of wear/damage of the labyrinth structure of the spindle and the change in the internal pressure of the spindle can be quantified and parameterized. This ultimately increases the efficiency of long-term maintenance/repair management of machine tools.

The above merely shows specific examples of a spindle pressure measuring device and measuring method for a machine tool.

Accordingly, it is to be made clear that a person having ordinary skill in the art can easily understand that the present invention can be substituted and modified in various forms without departing from the spirit of the present invention described in the claims below.

10: Main shaft pressure measuring device
11: Device housing 12: Sealing part
13: Insert 14: Pressure gauge
15: External pressure gauge 16: Pressure measuring unit

Claims (14)

A step of determining the structure of the main axis and the labyrinth structure of the main axis;
A step of determining measurement sites for the labyrinth of the main axis and measuring the numerical value of each measurement site;
A step for determining whether measurement of the main shaft internal pressure is necessary;
Step of installing a pressure measuring device of the main shaft and measuring the pressure of the main shaft; and
A step for determining whether the measured internal pressure is positive or negative;
A method for measuring the internal pressure of a spindle of a machine tool including a
In the first paragraph,
A method for measuring the internal pressure of a spindle of a machine tool, characterized in that the step of measuring the internal pressure of the spindle comprises driving the spindle for a set time at a set ratio RPM compared to the maximum RPM.
In the first paragraph,
A method for measuring the internal pressure of a spindle of a machine tool, characterized in that the step of measuring the internal pressure of the spindle comprises driving the spindle at a set change ratio RPM interval compared to the maximum RPM for a set time interval and measuring the internal pressure of the spindle.
In the first paragraph,
After determining the measurement site for the labyrinth of the main axis and measuring the numerical value of each measurement site,
A method for measuring the internal pressure of a spindle of a machine tool, further comprising: a step of comparing the numerical values for each part of the labyrinth of the measured spindle with the standard range value of the spindle internal pressure measurement set in advance.
In the first paragraph,
After the step of determining whether the measured internal pressure is positive or negative,
A method for measuring the internal pressure of a spindle of a machine tool, further comprising: a step of verifying whether the measured internal pressure positive/negative pressure is consistent with the set positive/negative pressure generation standard range value of the spindle.
In paragraph 5,
In the step of verifying whether the measured internal pressure positive/negative pressure generation matches the positive/negative pressure generation standard range value of the preset main axis, if they do not match,
A method for measuring the internal pressure of a spindle of a machine tool, characterized by repeating the step of measuring the internal pressure of the spindle.
In Article 6,
In the step of verifying whether the measured internal pressure positive/negative pressure generation matches the positive/negative pressure generation standard range value of the preset main axis, if they do not match,
A method for measuring the internal pressure of a spindle of a machine tool, further comprising: a step of determining whether the number of times (N) of internal pressure measurements of the spindle is N+1;
A step of determining the structure of the main axis and the labyrinth structure of the main axis;
A step of determining measurement sites for the labyrinth of the main axis and measuring the numerical value of each measurement site;
A step of comparing the numerical values for each part of the labyrinth of the measured main axis with the standard range value of the preset main axis internal pressure measurement;
A step for determining whether measurement of the main shaft internal pressure is necessary;
A step of installing a pressure measuring device on the spindle and measuring the internal pressure of the spindle;
A step for determining whether the measured internal pressure is positive or negative; and
A step for verifying whether the measured positive/negative pressure generation matches the positive/negative pressure generation standard range value of the preset main axis;
A method for measuring the internal pressure of a spindle of a machine tool including a
In Article 8,
A method for measuring the internal pressure of a spindle of a machine tool, characterized in that the step of measuring the internal pressure of the spindle comprises driving the spindle for a set time at a set ratio RPM compared to the maximum RPM.
In Article 8,
A method for measuring the internal pressure of a spindle of a machine tool, characterized in that the step of measuring the internal pressure of the spindle comprises driving the spindle at a set change ratio RPM interval compared to the maximum RPM for a set time interval and measuring the internal pressure of the spindle.
In Article 8,
In the step of verifying whether the measured internal pressure positive/negative pressure generation matches the positive/negative pressure generation standard range value of the preset main axis, if they do not match,
A method for measuring the internal pressure of a spindle of a machine tool, characterized by repeating the step of measuring the internal pressure of the spindle.
In Article 11,
In the step of verifying whether the measured internal pressure positive/negative pressure generation matches the positive/negative pressure generation standard range value of the preset main axis, if they do not match,
A method for measuring the internal pressure of a spindle of a machine tool, further comprising: a step of determining whether the number of times (N) of internal pressure measurements of the spindle is N+1;
A device housing having an insertion portion formed into which the front end of the main shaft is inserted;
A sealing portion arranged along the outer periphery of the insert portion and configured to seal the front end of the main shaft; and
A pressure measuring unit arranged in the above device housing and configured to measure the internal pressure of the main shaft;
A spindle internal pressure measuring device of a machine tool including a
In Article 13,
The above pressure measuring unit,
An internal pressure gauge that measures the internal pressure of the device housing and measures the internal pressure of the main shaft inserted into the insertion portion; and
An external pressure gauge for measuring the external pressure of the above device housing; including:
A spindle internal pressure measuring device for a machine tool, characterized in that it compares the internal pressure gauge numerical value with the external pressure gauge numerical value to determine whether the internal pressure of the spindle is positive or negative relative to the external pressure.

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