KR20180047495A - Method and apparatus for compensating spindle protrusion of machine tool - Google Patents

Abstract

Disclosed are an apparatus and a method for compensating for a protrusion amount of a main shaft of a machine tool, wherein a machining degree of machine tool can be improved by correcting a protrusion amount for each rotation speed section predetermined with respect to a protrusion amount generated in a Z-axis direction by centrifugal force in a rotation operation of the machine tool. The disclosed apparatus comprises: a motor unit for rotating a main shaft of a machine tool; a work piece processing unit for seating a work piece on the machine tool, and processing a work piece which is rotated in the same manner according to the rotation of the main shaft; a rotational speed detection unit for detecting the rotational speed of the main shaft; a protrusion amount storage unit for setting the rotational speed of the main shaft to one or more predetermined sections, and storing data by matching each protrusion amount with each set section; and a control unit for detecting the rotational speed of the main shaft of the machine tool through the rotational speed detection unit, recognizing which section the rotational speed of the detected major shaft corresponds to, calculating a protrusion amount correction value by reading protrusion amount data corresponding to the recognized section, and controlling the work piece to be processed by reflecting the calculated protrusion amount correction value to the work piece processing unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool main spindle protrusion amount compensation apparatus and method,

The present invention relates to an apparatus and method for compensating a spindle projection amount of a machining center of a machine tool, and more particularly, to an apparatus and a method for compensating a spindle protrusion amount of a machine tool by a centrifugal force And more particularly, to an apparatus and method for compensating for the protrusion of a machine tool spindle, which can improve the degree of machining of machine tool equipment.

Machining center is a numerically controlled machine tool that automatically performs various types of cutting machining on a single machine. It has an automatic tool change function and the ability to automatically machining and dividing two or more faces of a workpiece.

These machining centers include an automatic tool changer, a tool magazine, and an automatic loader.

In such a machine tool, a tool is mounted on a spindle that rotates under a rotational force, and the workpiece is machined (cut, etc.) by a rotating tool.

The turning accuracy of such machine tool spindles has an absolute effect on the roundness and surface roughness of the final machined workpiece. Therefore, rotational accuracy measurement of the machine tool spindle plays an important role not only in terms of performance evaluation of the machine tool but also in predicting the shape of the final workpiece.

However, when the machine tool is rotated in the main shaft, the main shaft is projected in the Z-axis direction due to the centrifugal force.

If the amount of protrusion of the main shaft is generated, it affects the rotation accuracy of the main spindle of the machine tool, and thus, the machining process such as the roundness and surface roughness of the workpiece may be adversely affected.

Korean Registered Patent No. 10-1560529 (registered on October 07, 2015)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems and to solve the above problems by providing a method of correcting the amount of protrusion generated in the Z axis direction by a centrifugal force during a rotation operation of a machine tool, And a method for compensating for the amount of protrusion of a machine tool spindle.

According to an aspect of the present invention, there is provided an apparatus for compensating for a protrusion of a main spindle of a machine tool, including: a motor unit for rotating a main shaft of the machine tool; A workpiece processing unit for placing a workpiece on the machine tool and for machining a workpiece rotated in the same manner as the main shaft rotates; A rotation speed detector for detecting a rotation speed of the main shaft; A protrusion amount storage unit for setting the rotational speed of the main shaft to one or more predetermined intervals and storing the protrusion amounts corresponding to the predetermined intervals in the form of data; And a rotation speed detector for detecting a rotational speed of the spindle of the machine tool, recognizing the period of rotation of the detected main spindle, reading the protrusion data corresponding to the recognized section, And a control unit for controlling the machining of the workpiece by reflecting the calculated projection amount correction value to the workpiece machining unit.

In addition, the workpiece machining unit may process the workpiece by compensating for the projection amount correction value in the direction opposite to the Z-axis direction in which the workpiece is projected in accordance with the rotation of the main shaft by applying the projection amount correction value received from the control unit have.

The protrusion amount storage unit may store the first section when the rotational speed of the main shaft is 8,000 to 10,000 rpm, the second section when the rotational speed is 10,000 to 12,000 rpm, the third section when the rotational speed of the main shaft is 12,000 to 14,000 rpm, The fourth section in the range of 16,000 to 18,000 rpm for the 14,000 to 16,000 rpm, the fifth section for the 18,000 to 20,000 rpm, the sixth section for the 20,000 to 22,000 rpm, and the range of 22,000 to 24,000 rpm And the seventh section.

The protrusion amount storage unit is associated with the protrusion amount data in units of 0.002 탆 for each of at least one predetermined interval set to the rotational speed of the main shaft.

The control unit recognizes a section corresponding to the rotation speed of the main shaft of the machine tool detected through the rotation speed detection unit and adds or subtracts 0.002 占 퐉 on the basis of the protrusion amount data corresponding to the recognized section, And transmits the calculated protrusion correction value to the workpiece machining unit to control the workpiece machining unit to perform machining in the Z-axis direction according to the projection amount correction value for the workpiece.

According to another aspect of the present invention, there is provided a method for compensating for a protrusion of a main spindle of a machine tool, including: a motor unit for rotating a main shaft of a machine tool; A workpiece processing unit for placing a workpiece on the machine tool and for machining a workpiece rotated in the same manner as the main shaft rotates; And a protrusion amount storing unit for setting the rotational speed of the main spindle to one or more predetermined intervals and storing the protrusion amounts corresponding to the protrusion amounts for each predetermined interval as data, the method comprising the steps of: (a) Detecting a rotation speed of the main shaft; (b) recognizing a period in which the rotation speed of the detected main shaft corresponds to the control section; (c) calculating a protrusion amount correction value by reading the protrusion amount data corresponding to the recognized section; (d) the control unit transmitting the calculated protrusion amount correction value to the workpiece processing unit; And (e) machining the workpiece by correcting the workpiece machining portion according to the projection amount correction value.

In addition, in the step (e), the workpiece machining unit may compensate for the projection amount correction value in the direction opposite to the Z-axis direction in which the workpiece protrudes in accordance with the rotation of the main shaft by applying the projection amount correction value received from the control unit The workpiece can be processed.

In addition, in the step (c), the control unit may calculate the protrusion correction value by adding and subtracting 0.002 占 퐉 on the basis of the protrusion amount data corresponding to the recognized section.

In the step (e), the workpiece machining portion may correct the workpiece by 0.002 占 퐉 in the Z-axis direction according to the projection amount correction value.

Other aspects, advantages and features of the present invention will become more apparent on the basis of the following description in the entire specification, including the following sections: Brief Description of the Drawings, Detailed Description, and Claims.

According to the present invention, it is possible to improve the degree of machining for the workpiece by correcting the amount of protrusion according to the rotational speed of the main shaft of the machine tool.

In addition, the amount of protrusion that occurs when the main spindle rotates can be predicted in advance for each RPM section, and the machining accuracy can be further improved by correcting the protrusion amount by 0.002 占 퐉 for each section.

Further, even if the spindle protrudes due to the centrifugal force when the spindle of the machine tool is rotated, the amount of protrusion is automatically recognized through the rotation speed and compensated according to the recognized amount of protrusion so that the workpiece can be precisely processed And the machining precision of the machine tool can be improved.

FIG. 1 is a block diagram schematically showing a block configuration of a machine tool main shaft projecting amount compensation apparatus according to an embodiment of the present invention.
2 is a view showing an example in which the workpiece protrudes in the Z-axis direction according to the rotation of the main shaft according to the present invention.
FIG. 3 is a flowchart illustrating a method of compensating for a spindle-head main shaft projection amount according to an embodiment of the present invention.
4 is a view showing a section set according to the rotational speed of the main shaft of the machine tool according to the embodiment of the present invention and the protrusion amount data corresponding thereto.
FIG. 5 is a view illustrating an example of displaying the state of compensation of the protrusion amount of the machine tool spindle on the screen according to the embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

If any part is referred to as being "on" another part, it may be directly on the other part or may be accompanied by another part therebetween. In contrast, when a section is referred to as being "directly above" another section, no other section is involved.

The terms first, second and third, etc. are used to describe various portions, components, regions, layers and / or sections, but are not limited thereto. These terms are only used to distinguish any moiety, element, region, layer or section from another moiety, moiety, region, layer or section. Thus, a first portion, component, region, layer or section described below may be referred to as a second portion, component, region, layer or section without departing from the scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified and that the presence or absence of other features, regions, integers, steps, operations, elements, and / It does not exclude addition.

Terms indicating relative space such as "below "," above ", and the like may be used to more easily describe the relationship to other portions of a portion shown in the figures. These terms are intended to include other meanings or acts of the apparatus in use, as well as intended meanings in the drawings. For example, when inverting a device in the figures, certain portions that are described as being "below" other portions are described as being "above " other portions. Thus, an exemplary term "below" includes both up and down directions. The device can be rotated by 90 degrees or rotated at different angles, and terms indicating relative space are interpreted accordingly.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Commonly used predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

FIG. 1 is a block diagram schematically showing a block configuration of a machine tool main shaft projecting amount compensation apparatus according to an embodiment of the present invention.

1, the apparatus 100 for compensating for the protrusion of a main spindle of a machine tool according to the present invention includes a motor unit 110, a workpiece machining unit 120, a rotation speed detecting unit 130, a protrusion amount storage unit 140, And a control unit 150.

The motor unit 110 rotates the main shaft of the machine tool. At this time, the motor unit 110 has a structure in which a main shaft is coupled to a motor that provides a rotational force. Accordingly, as the rotor of the motor rotates, the main shaft connected to the motor also rotates equally.

The workpiece machining unit 120 seats the workpiece on the machine tool and processes the same workpiece as the main shaft rotates. At this time, the workpiece machining portion 120 includes a seating portion for seating the workpiece, and a machining tool for performing machining such as addition, cutting, and the like to the workpiece.

2, the workpiece machining unit 120 applies the projection amount correction value received from the control unit 150 and calculates the amount of projection correction in the direction opposite to the Z-axis direction in which the workpiece is projected in accordance with the rotation of the main shaft, The workpiece can be machined by compensating for the value. 2 is a view showing an example in which the workpiece protrudes in the Z-axis direction according to the rotation of the main shaft according to the present invention. Therefore, if the direction in which the workpiece protrudes in the positive (+) direction of the Z axis in FIG. 2, the controller 150 controls the compensation to be performed in the negative direction, which is the opposite direction.

The rotation speed detector 130 detects the rotation speed of the main shaft.

The protrusion amount storage unit 140 sets the rotational speed of the main shaft to one or more constant intervals and stores the protrusion amounts corresponding to the predetermined intervals in the form of data.

The protrusion amount storage unit 140 stores the first section when the rotational speed of the main shaft is 8,000 to 10,000 rpm, the second section when the rotational speed is 10,000 to 12,000 rpm, the second section when the rotational speed of the main shaft is 12,000 to 14,000 rpm, In the fourth section in the range of 16,000 to 18,000 rpm for the 14,000 to 16,000 rpm, in the fifth section for the 18,000 to 20,000 rpm, in the sixth section for the 20,000 to 22,000 rpm, and in the range of 22,000 to 24,000 rpm Is set to the seventh section.

Further, the protrusion amount storage unit 140 is associated with the protrusion amount data in units of 0.002 占 퐉 for every one or more predetermined intervals set for the rotational speed of the main shaft.

The control unit 150 detects the rotational speed of the spindle of the machine tool through the rotational speed detector 130, recognizes the rotational speed of the detected main shaft, and outputs the protruding amount data corresponding to the recognized period And calculates the projection amount correction value and reflects the calculated projection amount correction value to the workpiece processing unit 120 to control the workpiece to be processed.

The control unit 150 recognizes a section corresponding to the rotational speed of the machine tool detected by the rotational speed detecting unit 130 and determines the rotational speed of the machine tool based on the protrusion amount data corresponding to the recognized section, And outputs the calculated protrusion correction value to the workpiece machining unit to control the workpiece machining unit 120 to execute machining in the Z-axis direction in accordance with the protrusion amount correction value for the workpiece have.

Although not shown in FIG. 1, a display unit for displaying on the screen the state of main shaft projecting amount compensation of the machine tool spindle head protrusion amount compensating apparatus 100 according to the present invention, an input unit for receiving data from a user or an administrator, And the like.

FIG. 3 is a flowchart illustrating a method of compensating for a spindle-head main shaft projection amount according to an embodiment of the present invention.

Referring to FIG. 3, the device 100 for compensating for the protrusion of the main spindle of a machine tool according to the present invention is configured such that the rotation speed of the main shaft is detected by the rotation speed detector 130 through the motor unit 110, (S310).

Next, the control unit 150 recognizes the interval of the detected rotational speed of the main shaft (S320).

Next, the control unit 150 reads the protrusion amount data corresponding to the recognized section from the protrusion amount storage unit 140 and calculates the protrusion amount correction value (S330).

At this time, as shown in FIG. 4, the protrusion amount storage unit 140 stores the section set according to the main shaft rotation speed and the protrusion amount data corresponding thereto. 4 is a view showing a section set according to the rotational speed of the main shaft of the machine tool according to the embodiment of the present invention and the protrusion amount data corresponding thereto. 4, the protrusion amount storage unit 140 stores the first section when the main shaft rotation speed is 8,000 to 10,000 rpm, the second section when the main shaft rotation speed is 10,000 to 12,000 rpm, the 12,000 to 14,000 rpm , A fourth zone in the case of 14,000 to 16,000 rpm, a fourth zone in the range of 16,000 to 18,000 rpm, a fifth zone in the range of 18,000 to 20,000 rpm, and a sixth zone in the range of 20,000 to 22,000 rpm , And 22,000 to 24,000 rpm, respectively. Accordingly, the protrusion amount corresponds to 0.002 占 퐉 in the first section, the protrusion amount corresponds to 0.004 占 퐉 in the second section, 0.006 占 퐉 in the third section, 0.008 占 퐉 in the fourth section, 0.010 占 퐉 in the fifth section, The sixth section corresponds to 0.012 占 퐉, the seventh section corresponds to 0.014 占 퐉, and the eighth section corresponds to 0.016 占 퐉. That is, each interval is correspondingly increased by 0.002 탆.

Therefore, the control unit 150 can calculate the protrusion amount correction value by adding / subtracting 0.002 占 퐉 based on the protrusion amount data corresponding to the recognized section.

Next, the control unit 150 transmits the calculated protrusion amount correction value to the workpiece processing unit 120 (S340).

At this time, the controller 150 displays the existing thermal displacement correction amount, the main shaft projection amount correction amount, and the final Z axis correction amount as shown in FIG. 5 on the display unit screen for the administrator or the user to view. FIG. 5 is a view illustrating an example of displaying the state of compensation of the protrusion amount of the machine tool spindle on the screen according to the embodiment of the present invention.

Thus, the workpiece machining unit 120 corrects the projection amount correction value to process the workpiece (S350).

That is, the workpiece machining unit 120 compensates the workpiece by the amount of projection correction in the direction opposite to the Z-axis direction in which the workpiece protrudes in accordance with the rotation of the main shaft by applying the projection amount correction value received from the control unit 150 . For example, the workpiece machining section 120 can correct the workpiece by correcting it by 0.002 占 퐉 in the Z-axis direction according to the projection amount correction value.

Therefore, even if the spindle protrudes due to the centrifugal force when the main spindle of the machine tool is rotated, the amount of protrusion is automatically recognized through the rotational speed and compensated according to the recognized amount of protrusion, so that the workpiece can be precisely processed And the machining precision of the machine tool can be improved.

As described above, according to the present invention, it is possible to improve the degree of machining of machine tool equipment by correcting the amount of protrusion generated in the Z-axis direction by the centrifugal force in the rotating operation of the machine tool to a predetermined amount of protrusion The apparatus and method for compensating for the protrusion of the machine tool main shaft can be realized.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. Only. It is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. .

100: Machine tool main shaft protrusion amount compensation device
110:
120: workpiece machining part
130:
140: protrusion amount storage section
150:

Claims (9)

A motor unit for rotating the main shaft of the machine tool;
A workpiece processing unit for placing a workpiece on the machine tool and for machining a workpiece rotated in the same manner as the main shaft rotates;
A rotation speed detector for detecting a rotation speed of the main shaft;
A protrusion amount storage unit which sets the rotation speed of the main shaft to one or more constant intervals and stores the protrusion amounts corresponding to the predetermined intervals in the form of data; And
The rotational speed detecting unit detects the rotational speed of the spindle of the machine tool, recognizes the rotational speed of the detected main shaft, and reads the protrusion amount data corresponding to the recognized section, And controlling the machining of the workpiece by reflecting the calculated projection amount correction value to the workpiece machining portion;
Wherein the machine tool main shaft projecting amount compensation device includes:
The method according to claim 1,
Wherein the workpiece machining unit applies the projection amount correction value received from the control unit to compensate the projection amount correction value in a direction opposite to the Z axis direction in which the workpiece protrudes in accordance with the rotation of the main shaft to machine the workpiece, A device for compensating the amount of spindle projection.
The method according to claim 1,
The protruding amount storage section may be divided into a first section when the rotational speed of the main shaft is in the range of 8,000 to 10,000 rpm, a second section in the range of 10,000 to 12,000 rpm, a third section in the case of 12,000 to 14,000 rpm, The fourth section in the case of 16,000 to 18,000 rpm, the fifth section in the range of 18,000 to 20,000 rpm, the sixth section in the range of 20,000 to 22,000 rpm, and the sixth section in the range of 22,000 to 24,000 rpm in the case of 16,000 rpm. And the machine tool main spindle protrusion amount compensation device.
The method according to claim 1,
Wherein the protrusion amount storage section is associated with the protrusion amount data in units of 0.002 占 퐉 in every at least one predetermined section set to the rotational speed of the main spindle.
The method according to claim 1,
The control unit recognizes a section corresponding to the rotation speed of the main shaft of the machine tool detected through the rotation speed detecting unit, and performs an acceleration / deceleration by 0.002 占 퐉 on the basis of the protrusion amount data corresponding to the recognized section, Wherein the control unit controls the workpiece machining unit to perform machining in the Z-axis direction in accordance with the projection amount correction value with respect to the workpiece machining unit by transmitting the calculated projection amount correction value to the workpiece machining unit, Device.
A motor unit for rotating the main shaft of the machine tool; A workpiece processing unit for placing a workpiece on the machine tool and for machining a workpiece rotated in the same manner as the main shaft rotates; And a protrusion amount storage unit for setting the rotation speed of the main spindle to one or more predetermined intervals and storing the protrusion amounts corresponding to the protrusion amounts for each predetermined interval as data,
(a) detecting a rotational speed of the main shaft by a rotational speed detecting unit;
(b) recognizing a period in which the rotation speed of the detected main shaft corresponds to the control section;
(c) calculating a protrusion amount correction value by reading the protrusion amount data corresponding to the recognized section;
(d) the control unit transmitting the calculated protrusion amount correction value to the workpiece processing unit; And
(e) machining the workpiece by correcting the workpiece machining portion according to the projection amount correction value;
Wherein the machine tool main shaft projecting amount compensation device includes:
The method according to claim 6,
In the step (e), the workpiece machining unit applies a projection amount correction value received from the control unit to compensate for the projection amount correction value in the direction opposite to the Z-axis direction in which the workpiece protrudes in accordance with the rotation of the main shaft, Of the machine tool spindle.
The method according to claim 6,
Wherein the controller calculates the protrusion correction value by adding and subtracting 0.002 占 퐉 based on the protrusion amount data corresponding to the recognized section in the step (c).

The method according to claim 6,
Wherein in the step (e), the workpiece machining unit corrects the workpiece by 0.002 占 퐉 in the Z-axis direction in accordance with the projection amount correction value and processes the workpiece.

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