KR20230103319A - Method for controlling machine tool that automatically aligns the center of workpiece - Google Patents

Abstract

The present invention is a machine tool for automatically aligning the center of a workpiece that can measure the center point and height of a workpiece by exchanging a tool of a machine tool with a measuring tool and align the center of the workpiece by replacing the tool of the machine tool with a centering tool. to provide a control method.
To this end, the control method of a machine tool for automatically aligning the center of a workpiece according to an embodiment of the present invention includes a measuring tool exchange step (S10) of exchanging a measuring tool; Measuring the outer diameter of the workpiece (S20); Based on the value measured in step S20, calculating the center point and the X-axis and Y-axis adjustment amounts of the workpiece (S30); Determining whether the X-axis adjustment amount or the Y-axis adjustment amount calculated in step S30 exceeds a predetermined threshold value (S40); If the X-axis adjustment amount or the Y-axis adjustment amount exceeds the threshold value in step S40, measuring the height of the workpiece (S50); Calculating a centering adjustment point of the workpiece based on the values calculated in steps S30 and S50 (S60); And replacing with a centering tool to perform centering (S70); including, repeating S10 to S70, and exchanging with a machining tool when the X-axis adjustment amount and the Y-axis adjustment amount are less than or equal to the threshold value in step S40. (S80) is further included.

Description

Method for controlling machine tool that automatically aligns the center of workpiece

The present invention relates to a control method for a machine tool that automatically aligns the center of a workpiece, and more particularly, measures the center point and height of a workpiece by exchanging a tool of the machine tool with a measuring tool, and uses the tool of the machine tool as a centering tool. It relates to a control method of a machine tool that automatically aligns the center of a workpiece by replacing the

In general, a machining center is a machine tool that performs a wide range of machining that can be performed on a lathe, milling, drilling, boring machine, and the like.

These machining centers are generally divided into vertical machining centers in which the main shaft is mounted vertically and horizontal machining centers in which the main shaft is installed in a horizontal manner.

Here, the vertical machining center largely includes a bed, a table installed on top of the bed and on which a workpiece is placed, a column vertically mounted at the rear of the bed, and a spindle mounted on the column.

That is, the vertical machining center is configured to process a workpiece placed on a table while moving in horizontal and vertical directions with a cutting tool installed on the spindle.

At this time, as the error between the center point of the table on which the workpiece is placed and the center point of the workpiece increases, the frequency of occurrence of defects increases during machining operations such as lathe, milling, drilling, and boring machines.

Meanwhile, a machining tool for processing a workpiece, a measuring tool optimized for measuring the size of a workpiece according to the shape of the workpiece, and a centering tool for centering the workpiece have different shapes according to their respective purposes, so they can be integrated. There is a problem that cannot be formed with a single tool.

In addition, when the user exchanges the tools one by one according to the work process, a problem in that the work time becomes longer occurs.

As an example of a conventional machine tool for solving this problem, there is Korean Patent Publication No. 10-2020-0034959. Briefly looking at this, a tool mounted on a spindle of a machine tool may be exchanged for various tools according to a purpose, and the exchange of such a tool may be performed automatically.

Republic of Korea Patent Publication No. 10-2020-0034959

An object to be solved by the present invention is to provide a control method for a machine tool that measures the outer diameter of a workpiece with a measuring tool, calculates a center point of the workpiece, and automatically aligns the center of the workpiece.

Another problem to be solved by the present invention is to provide a control method for a machine tool that automatically aligns the center of a workpiece by measuring the inner diameter of the workpiece with a measuring tool and calculating the center point of the workpiece.

Another problem to be solved by the present invention is to move the workpiece by applying force to the center of gravity with a centering tool when aligning the center of the workpiece, so that the workpiece can be moved with little force and the center of the workpiece is automatically aligned. It is to provide a control method of.

Another problem to be solved by the present invention is to provide a control method for a machine tool that automatically aligns the center of a workpiece when an error between the center point of a workpiece and the center point of a table exceeds a threshold value.

The objects of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a control method of a machine tool for automatically aligning the center of a workpiece according to an embodiment of the present invention,

bed; Saddles disposed on the upper side of the bed and relatively moved in the left and right directions with respect to the bed; a column disposed on the upper side of the saddle and moving relative to the saddle in a forward and backward direction; A spindle installed in the column and moved in the vertical direction with respect to the column; an automatic tool changer installed in a column corresponding to the spindle and providing one of a plurality of tools to the spindle; and a table portion positioned in front of the saddle, and the plurality of tools include a processing tool, a measuring tool, and a centering tool.

Here, the measuring tool exchange step of exchanging with the measuring tool (S10); Measuring the outer diameter of the workpiece (S20); Based on the value measured in step S20, calculating the center point and the X-axis and Y-axis adjustment amounts of the workpiece (S30); Determining whether the X-axis adjustment amount or the Y-axis adjustment amount calculated in step S30 exceeds a predetermined threshold value (S40); If the X-axis adjustment amount or the Y-axis adjustment amount exceeds the threshold value in step S40, measuring the height of the workpiece (S50); Calculating a centering adjustment point of the workpiece based on the values calculated in steps S30 and S50 (S60); And replacing with a centering tool to perform centering (S70); including, repeating S10 to S70, and exchanging with a machining tool when the X-axis adjustment amount and the Y-axis adjustment amount are less than or equal to the threshold value in step S40. (S80) is further included for control.

In addition, step S20 selects either the X axis or the Y axis, moves the spindle along the selected axis from the outermost edge of the table to the center point of the table, and when the contact between the measuring tool and the workpiece is detected during the movement of the spindle. Step S21 of storing the X and Y coordinates of the spindle as first coordinates; Step S22 of rotating the table 120 degrees and then performing the same operation as step S21 to store the X and Y coordinates of the spindle when contact between the measuring tool and the workpiece is detected as second coordinates; Step S23 of rotating the table 120 degrees and then performing the same operation as step S21 to store the X and Y coordinates of the spindle when contact between the measuring tool and the workpiece is detected as third coordinates; Based on the first to third coordinates stored in steps S21 to S23, calculate the radius of the circumscribed circle of the triangle having the three coordinates as vertices, and derive the outer diameter of the workpiece by doubling the radius; S24 step; may include. there is.

In addition, step S30, based on the first to third coordinates measured in step S20, S31 step of deriving the center point of the workpiece by calculating the coordinates of the circumcenter of the triangle having the three coordinates as vertices; A step S32 of calculating an X-axis adjustment amount and a Y-axis adjustment amount by calculating the difference between the X and Y coordinate values of the center point of the workpiece and the X and Y coordinate values of the center point of the table.

Further, in step S50, based on the center point of the workpiece calculated in step S30, with respect to an arbitrary position inside the outer diameter of the workpiece, the spindle equipped with the measuring tool is moved downward from the highest position, and the measuring tool and The length value obtained by subtracting the Z coordinate value of the upper surface of the workpiece clamp from the Z coordinate value of the spindle when the contact of the workpiece is detected is stored as the first height, and step S50 is repeated N times, and when step S50 is performed N times The stored length value may be stored as an Nth height.

In addition, step S60 may calculate the Y and Z coordinates of the X-axis adjustment point for moving the workpiece by the X-axis adjustment amount and the X and Z coordinates of the Y-axis adjustment point for moving the workpiece by the Y-axis adjustment amount.

In addition, the Y coordinate of the X-axis adjustment point in step S60 is the Y coordinate of the center point of the workpiece calculated in step S30, the X coordinate of the Y-axis adjustment point is the X coordinate of the center point of the workpiece calculated in step S30, and the X-axis adjustment The Z coordinate of the point and the Y-axis adjustment point may have a Z coordinate value of a point half of the average height by calculating the average height of the first to Nth heights measured in step S50.

In addition, step S70 includes a step S71 of exchanging a tool coupled to the spindle with a centering tool; S72 step of moving the workpiece by the X-axis adjustment amount by contacting the end of the push part of the centering tool with the X-axis adjustment point, and moving the workpiece by the Y-axis adjustment amount by contacting the end of the push part of the centering tool with the Y-axis adjustment point; can include

In order to achieve the above object, a method for controlling a machine tool for automatically aligning the center of a workpiece according to another embodiment of the present invention includes a bed; Saddles disposed on the upper side of the bed and relatively moved in the left and right directions with respect to the bed; a column disposed on the upper side of the saddle and moving relative to the saddle in a forward and backward direction; A spindle installed in the column and moved in the vertical direction with respect to the column; an automatic tool changer installed in a column corresponding to the spindle and providing one of a plurality of tools to the spindle; and a table portion positioned in front of the saddle, and the plurality of tools include a processing tool, a measuring tool, and a centering tool.

Here, a measuring tool exchange step of exchanging with a measuring tool (S110); Measuring the inner diameter of the workpiece (S120); Based on the value measured in step S120, calculating the center point and the X-axis and Y-axis adjustment amounts of the workpiece (S130); Determining whether the X-axis adjustment amount or the Y-axis adjustment amount calculated in step S130 exceeds a preset threshold value (S140); If the X-axis adjustment amount or the Y-axis adjustment amount exceeds the threshold value in step S140, calculating a centering adjustment point of the workpiece based on the value calculated in step S130 (S150); And exchanging with a centering tool to perform centering (S160); including, repeating S110 to S160 to replace the processing tool when the X-axis adjustment amount and the Y-axis adjustment amount are less than or equal to the threshold value in step S140 ( S170) is further included for control.

In addition, step S120 selects any one axis of the X axis or the Y axis, moves the spindle along the selected axis from the center point of the table to the outermost edge of the table, and when the contact between the measuring tool and the workpiece is detected during the movement of the spindle Step S121 of storing the X, Y coordinates of the spindle as first coordinates; Step S122 of rotating the table 120 degrees and then performing the same operation as step S121 to store the X and Y coordinates of the spindle when contact between the measuring tool and the workpiece is detected as second coordinates; Step S123 of rotating the table 120 degrees and then performing the same operation as step S121 to store the X and Y coordinates of the spindle when contact between the measuring tool and the workpiece is detected as third coordinates; Based on the first to third coordinates stored in steps S121 to S123, calculate the radius of the circumscribed circle of the triangle having the three coordinates as vertices, and derive the inner diameter of the workpiece by doubling the radius; S124 step; may include. there is.

In addition, step S130, based on the first to third coordinates measured in step S120, by calculating the coordinates of the circumcenter of the triangle having the three coordinates as vertices S131 step of deriving the center point of the workpiece; It may include; S132 step of calculating the X-axis adjustment amount and the Y-axis adjustment amount by calculating the difference between the X, Y coordinate values of the center point of the workpiece and the X, Y coordinate values of the center point of the table.

In addition, step S150 may calculate the Y coordinate of the X-axis adjustment point for moving the workpiece by the X-axis adjustment amount and the X coordinate of the Y-axis adjustment point for moving the workpiece by the Y-axis adjustment amount.

In addition, the Y coordinate of the X-axis adjustment point in step S150 may be the Y coordinate of the center point of the workpiece calculated in step S130, and the X coordinate of the Y-axis adjustment point may be the X coordinate of the center point of the workpiece calculated in step S130.

In addition, step S160 includes a step S161 of exchanging a tool coupled to the spindle with a centering tool; Step S162 of moving the workpiece by the X-axis adjustment amount by contacting the side surface of the support part of the centering tool and the X-axis adjustment point, and moving the workpiece by the Y-axis adjustment amount by contacting the side surface of the support part of the centering tool and the Y-axis adjustment point; can include

Other embodiment specifics are included in the detailed description and drawings.

The method for controlling a machine tool for automatically aligning the center of a workpiece according to an embodiment of the present invention may exhibit at least one of the following effects.

First, there is an effect of calculating the center point of the workpiece by measuring the outer diameter of the workpiece with a measuring tool.

Second, there is an effect of calculating the center point of the workpiece by measuring the inner diameter of the workpiece with a measuring tool.

Third, when aligning the center of the workpiece, since the centering tool applies force to the center of gravity to move the workpiece, there is an effect of moving the workpiece with little force.

Fourth, when the error between the center point of the workpiece and the center point of the table exceeds a critical value, the center of the workpiece is automatically aligned.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view of a machine tool for automatically aligning the center of a workpiece according to an embodiment of the present invention.
2 is a schematic configuration diagram of a machine tool according to an embodiment of the present invention viewed from the right side.
3 is a side view showing a measuring tool according to an embodiment of the present invention.
Figure 4a is a side view showing a state of measuring the outer diameter of the workpiece.
Figure 4b is a side view showing the state of measuring the height of the workpiece.
5 is a side view showing a centering tool according to an embodiment of the present invention.
Figure 6a is a side view showing a state of centering the workpiece from the outside.
Figure 6b is a plan view showing the state of centering the workpiece from the outside.
7 is a plan view showing a state of centering a workpiece from the inside.
8 is a flowchart illustrating a method of controlling a machine tool for automatically aligning the center of a workpiece according to an embodiment of the present invention.
9 is a flowchart illustrating a control method of a machine tool automatically aligning the center of a workpiece according to another embodiment of the present invention.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numbers designate like elements throughout the specification.

In the following drawings, the thickness or area is enlarged and shown in order to clearly express various parts and areas. The same reference numerals are used for like parts throughout the specification. When a part of a part, region, etc. is said to be “on” or “on top” of another part, this includes not only the case of being “directly on” the other part, but also the case of another part in the middle. Conversely, when a part is said to be “directly on top” of another part, it means that there is no other part in between.

In addition, terms such as "below", "lower side", "above", and "upper side" are used to describe the relationship between components shown in the drawings. The above terms are relative concepts and will be described based on the directions shown in the drawings.

Hereinafter, the present invention will be described with reference to drawings for explaining a control method of a machine tool for automatically aligning the center of a workpiece according to an embodiment of the present invention.

A machine tool for automatically aligning the center of a workpiece will be described with reference to FIGS. 1 to 3 and 5 .

Figure 1 is a perspective view of a machine tool for automatically aligning the center of a workpiece according to an embodiment of the present invention, Figure 2 is a schematic configuration diagram of the machine tool according to an embodiment of the present invention viewed from the right, Figure 3 is the present invention is a side view showing a measuring tool according to an embodiment, and FIG. 5 is a side view showing a centering tool according to an embodiment of the present invention.

A machine tool for automatically aligning the center of a workpiece according to an embodiment of the present invention includes a control unit for controlling the machine tool, a processing device unit 100 for measuring, aligning, and processing a workpiece (W), and an operation of the workpiece (W). It includes a table unit 200 for fixing or changing the position of the workpiece W between them.

The control unit is electrically connected to the processing device unit 100 and the table unit 200, receives measurement signals generated by the processing unit 100 and the table unit 200, and generates a control signal. The control signal generated by the control unit is transmitted to the processing unit 100 and the table unit 200 to control the operation of the processing unit 100 and the table unit 200 .

The processing unit 100 includes a bed 10, a saddle 20, a column 30, a spindle 40, and an automatic tool changer 50.

The bed 10 performs the function of a support for supporting the processing unit 100, and is fixed in position with respect to the ground side.

The saddle 20 is disposed on the upper side of the bed 10.

The saddle 20 may be moved relative to the bed 10 in the left and right directions.

A saddle guide 25 is installed between the saddle 20 and the bed 10 to guide the moving direction of the saddle 20 . The saddle guide 25 may be an LM guide.

The saddle 20 may be seated on the saddle guide 25 and moved in the left and right directions.

The saddle 20 includes a saddle driver (not shown) that provides power to move in the left and right directions.

Column 30 is disposed on top of saddle 20 .

The column 30 may be moved relative to the saddle 20 in a forward and backward direction.

The column 30 may be relatively moved in the forward and backward directions while being mounted on the saddle 20 .

A column guide 35 guiding the movement direction of the column 30 is disposed between the column 30 and the saddle 20 . The column guide 35 may be an LM guide.

The column 30 includes a column driver (not shown) that moves in the forward and backward directions.

Spindle 40 is installed in column 30 .

The spindle 40 is moved relative to the column 30 in an up and down direction.

The spindle 40 may be installed on the column 30 and move in an up and down direction.

A spindle guide 45 for guiding the moving direction of the spindle 40 is installed between the spindle 40 and the column 30 . The spindle guide 45 may be an LM guide.

The spindle 40 includes a spindle shaft that provides rotational force to the tool, a shaft drive unit that provides rotational force to the spindle shaft, and a position drive unit (not shown) that moves the spindle 40 vertically along the spindle guide. .

In the spindle 40, a tool is coupled to the spindle axis to perform processing, measurement, and alignment operations.

The spindle 40 replaces tools through an automatic tool changer 50 to be described later.

Power transmission components for transmitting power to a tool may be installed on the spindle shaft, and since this is a common technique for those skilled in the art, a detailed description thereof will be omitted.

The automatic tool changer 50 is installed in the column 30.

The automatic tool changer 50 is disposed on the side of the spindle 40.

In the automatic tool changer 50, a plurality of tools are installed.

For example, a distance detecting tool (not shown) capable of detecting a height with the turntable 210 on which the workpiece W is loaded is installed.

For example, a processing tool (not shown) for processing the workpiece (W) is installed.

For example, a measuring tool 51 for measuring the outer diameter or inner diameter or height of the workpiece W is installed. The measuring tool 51 includes a support part 51a coupled to the spindle 40 and a measuring part 51b that is in contact with the workpiece W to measure the size of the workpiece W.

For example, a centering tool 52 for aligning the center point of the work W is installed. The centering tool 52 includes a support portion 52a coupled to the spindle 40 and a push portion 52b capable of moving the workpiece W in contact with the workpiece W.

The plurality of tools is not limited to the above-described examples, and various other known tools may be installed.

The automatic tool changer 50 may provide one of the installed tools to the spindle 40 to continuously perform measurement, alignment, and processing.

In this embodiment, the automatic tool changer 50 is of a rotary type, and may rotate a plurality of installed tools and provide one of them to the spindle 40 for coupling.

Since the process and structure of coupling tools to the automatic tool changer 50 are common to those skilled in the art, detailed descriptions thereof will be omitted.

In addition, since the operating structures of the saddle driving unit, the column driving unit and the spindle driving unit are general techniques to those skilled in the art, detailed descriptions thereof will be omitted.

The table unit 200 includes a table 210, a workpiece clamp 215, and a rotation unit 220.

The table 210 performs processing, measurement, and alignment of the workpiece W at the upper side.

The table 210 is preferably positioned at the height of the saddle 20 .

Table 210 is located in front of saddle 20 .

The work clamp 215 is installed on the upper side of the table 210 and fixes or releases the work W.

The work clamp 215 is preferably fixed to the table 210 in order to suppress movement of the work W during processing of the work W.

The workpiece clamp 215 may be fixed to the table 210 through fastening means such as bolts or clamps.

The rotation unit 220 is rotatably fixed to the ground side and connected to the table 210 to rotate the table 210 .

The rotation unit 220 is a device that rotates the table 210 by providing power.

The rotational force of the rotating part 220 is transmitted to the workpiece W through the table 210 and the workpiece clamp 215 .

As the rotating part 220, a motor is used in this embodiment.

Due to the rotation of the rotation unit 220, the table 210 rotates 90 degrees instead of changing the work axis during the measurement and alignment operations of the workpiece W, thereby reducing the movement of the processing unit 100.

Power transmission members (not shown) may be disposed between the table 210 and the motor of the rotation unit 220 to rotate the table 210 using rotational force of the motor.

The power transmission members may be implemented in various ways, such as a belt-pulley structure, a gear structure, and a chain structure.

In addition, it is also possible to directly connect the motor to the table 210 and rotate the table 210 with the rotational force of the motor.

A control method of a machine tool automatically aligning the center of a workpiece will be described with reference to FIGS. 4 and 6 to 9 .

In addition, the spindle 40 can move up and down with respect to the column 30, the column 30 can move back and forth with respect to the saddle 20, and the saddle 20 can move left and right with respect to the bed 10, Hereinafter, for convenience of explanation, this will be omitted and the forward and backward movement, left and right movement, and vertical movement of the spindle 40 will be described.

Figure 4a is a side view showing a state of measuring the outer diameter of the workpiece, Figure 4b is a side view showing a state of measuring the height of the workpiece, Figure 6a is a side view showing a state of centering the workpiece from the outside, Figure 6b is a workpiece 7 is a plan view showing centering a workpiece from the inside, and FIG. 8 is a control method of a machine tool automatically aligning the center of a workpiece according to an embodiment of the present invention. 9 is a flow chart showing a control method of a machine tool for automatically aligning the center of a workpiece according to another embodiment of the present invention.

The control method of a machine tool for automatically aligning the center of a workpiece according to an embodiment of the present invention includes the steps of exchanging a measuring tool 51 (S10), measuring the outer diameter of a workpiece (W) (S20), Calculating the center point of the workpiece W and the X-axis and Y-axis adjustment amount (S30), determining whether the X-axis or Y-axis adjustment amount exceeds the threshold value (S40), and X-axis or Y-axis adjustment amount in step S40 If the axis adjustment amount exceeds the critical value, measuring the height of the workpiece (S50), calculating the centering adjustment point of the workpiece (S60), and performing centering by exchanging the centering tool 52 (S70). ), and repeating S10 to S70 to exchange the processing tool when the X-axis or Y-axis adjustment amount does not exceed the threshold value in step S40 (S80).

In step S10, the tool coupled to the spindle 40 is replaced with the measuring tool 51.

Step S10 may be performed manually, but is preferably performed using the automatic tool changer 50.

In step S20, the outer diameter of the workpiece W is measured.

Step S20 includes steps S21, S22, S23, and S24.

The method of measuring the outer diameter of the workpiece W in step S20 is as follows.

First, in step S21, either the X axis or the Y axis is selected, and the spindle on which the measuring tool 51 is mounted along the selected axis from the outermost edge of the table 210 to the center point O of the table 210 ( 40) is moved. During the movement of the spindle 40, the X and Y coordinates of the spindle 40 when the contact between the measuring part 51b of the measuring tool 51 and the workpiece W are detected are transmitted to the control unit, and the control unit transmits the transmitted coordinates. is stored as the first coordinate.

Second, in step S22, after rotating the table unit 200 by 120 degrees, the measuring tool 51 is mounted from the outermost edge of the table 210 to the center point O of the table 210 along the axis selected in step S21. Move the spindle (40). During the movement of the spindle 40, the X and Y coordinates of the spindle 40 when the contact between the measuring part 51b of the measuring tool 51 and the workpiece W are detected are transmitted to the control unit, and the control unit transmits the transmitted coordinates. is stored as the second coordinate.

Thirdly, in step S23, after rotating the table unit 200 by 120 degrees, the measuring tool 51 from the outermost edge of the table 210 to the center point O of the table 210 along the axis selected in steps S21 and S22 moves the mounted spindle 40. During the movement of the spindle 40, the X and Y coordinates of the spindle 40 when the contact between the measuring part 51b of the measuring tool 51 and the workpiece W are detected are transmitted to the control unit, and the control unit transmits the transmitted coordinates. is stored as the third coordinate.

Fourth, in step S24, based on the first to third coordinates stored in the control unit, the radius of the circumscribed circle of the triangle having the three coordinates as vertices is calculated, and the radius is doubled to derive the outer diameter of the workpiece W.

In step S30, the center point (O') of the workpiece (W) and the X-axis and Y-axis adjustment amounts are calculated.

Step S30 includes steps S31 and S32.

In step S31, based on the first to third coordinates stored in the controller, the coordinates of the circumcenter of the triangle having the three coordinates as vertices may be calculated to derive the center point O' of the work W.

In step S32, the difference between the X coordinate values of the center point (O') of the workpiece (W) and the center point (O) of the table 210 calculated in step S31 is calculated as the X-axis adjustment amount, The difference between the Y coordinate values of the center point O' of the workpiece W and the center point O of the table 210 is calculated as the Y-axis adjustment amount.

In step S40, it is determined whether the X-axis adjustment amount or the Y-axis adjustment amount calculated in step S30 exceeds a preset threshold value, and if either of the X-axis and Y-axis adjustment amounts exceeds the threshold value, step S50 is executed, When both the X-axis and Y-axis adjustment amounts are less than or equal to the threshold value, step S80 is executed.

The threshold value is an arbitrary value within a range in which the eccentricity of the workpiece W does not affect the work when the table unit 200 rotates and processes the workpiece.

If the threshold value is set too large, the workpiece W becomes eccentric even if the centering operation is finished, and if the threshold value is set too small, a problem arises in that the centering operation is performed more times.

In step S50, the height of the workpiece W is repeatedly measured.

In step S50, the spindle 40 equipped with the measuring tool 51 is moved to the highest position at an arbitrary position inside the outer diameter of the workpiece W based on the center point O' of the workpiece W calculated in step S30. Move down from position. The Z coordinate value of the upper surface of the workpiece clamp 215 in the Z coordinate value of the spindle 40 when the contact between the measuring part 51b of the measuring tool 51 and the workpiece W is detected during the movement of the spindle 40 The length value obtained by subtracting is transmitted to the controller, and the controller stores the transmitted length value as the first height. That is, the height value of only the workpiece (W) is stored by excluding the height of the workpiece clamp 215 from the height in contact with the workpiece.

Step S50 repeats this step N times, and the control unit stores the length value transmitted when this step is performed N times as the Nth height.

In step S60, the centering adjustment point of the workpiece (W) is calculated.

The centering adjustment point is the center of gravity of the workpiece (W). When centering the workpiece (W), which will be described later, force is applied to the center of gravity of the workpiece (W), so that the workpiece (W) can be moved with little force without being eccentric. there is.

The centering adjustment point includes an X-axis adjustment point for moving the workpiece W in the X-axis direction by the X-axis adjustment amount, and a Y-axis adjustment point for moving the workpiece W in the Y-axis direction by the Y-axis adjustment amount. do.

If the density of the workpiece (W) is constant, the X and Y coordinate values of the coordinate values of the center of gravity of the workpiece (W) are the X and Y coordinate values of the center point (O') of the workpiece (W) calculated in step S30 and Since the same or similar, and the Z coordinate value of the coordinate values of the center of gravity of the workpiece (W) is equal to or similar to half of the average height of the workpiece (W), the Z value of the X-axis and Y-axis adjustment points is the same as that of the step S50. It can be derived by calculating the average value of the first to Nth heights stored in . In addition, the Y-coordinate value of the X-axis adjustment point is the same as the Y-coordinate value of the center point (O') of the workpiece (W), and the X-coordinate value of the Y-axis adjustment point is the center point (O') of the workpiece (W). is the same as the X coordinate value of

In step S70, the tool coupled to the spindle 40 is replaced with the centering tool 52 to center the workpiece W.

Step S70 includes steps S71 and S72.

In step S71, the tool coupled to the spindle 40 is replaced with the centering tool 52. Step S71 may be performed manually, but is preferably performed through the automatic tool changer 50.

In step S72, the end of the push part 52b of the centering tool 52 contacts the X-axis adjustment point calculated in step S60 to press and move the workpiece W by the X-axis adjustment amount, and the centering tool 52 By contacting the end of the push part 52b and the Y-axis adjustment point calculated in step S60, the workpiece W is moved by pressing the Y-axis adjustment amount.

Step S70 restarts step S10 when the movement of the workpiece W is completed.

In step S80, the tool coupled to the spindle 40 is exchanged for a machining tool, and the automatic workpiece centering process is terminated.

Hereinafter, a method of controlling a machine tool for automatically aligning the center of a workpiece according to another embodiment of the present invention will be described. Among the configurations not described, essential configurations for constituting the invention are the same as those of the above-described embodiment of the present invention, and thus will be omitted.

A method of controlling a machine tool for automatically aligning the center of a workpiece according to another embodiment of the present invention includes the steps of exchanging a measuring tool 51 (S110), measuring the inner diameter of a workpiece (W) (S120), , calculating the center point of the workpiece W and the X-axis and Y-axis adjustment amount (S130), determining whether the X-axis or Y-axis adjustment amount exceeds the threshold value (S140), and in step S140, the X-axis or Y-axis adjustment amount. If the Y-axis adjustment amount exceeds the threshold, measuring the height of the workpiece (S150), calculating the centering adjustment point of the workpiece (S160), and performing centering by exchanging with the centering tool 52 ( S170), and repeating S110 to S170 to replace the processing tool when the X-axis or Y-axis adjustment amount does not exceed the threshold value in step S140 (S180).

Step S110 is the same as step S10 described above.

In step S120, the inner diameter of the workpiece (W) is measured.

Step S120 includes steps S121, S122, S123, and S124.

A method of measuring the inner diameter of the workpiece W in step S120 is as follows.

First, in step S121, either the X axis or the Y axis is selected, and the measuring tool 51 is mounted along the selected axis from the center point (O') of the table 210 to the outermost edge of the table 210. Move (40). During the movement of the spindle 40, the X and Y coordinates of the spindle 40 when the contact between the measuring part 51b of the measuring tool 51 and the workpiece W are detected are transmitted to the control unit, and the control unit transmits the transmitted coordinates. is stored as the first coordinate.

Second, in step S122, after rotating the table unit 200 by 120 degrees, the measuring tool 51 is mounted from the center point O of the table 210 to the outermost edge of the table 210 along the axis selected in step S121. Move the spindle (40). During the movement of the spindle 40, the X and Y coordinates of the spindle 40 when the contact between the measuring part 51b of the measuring tool 51 and the workpiece W are detected are transmitted to the control unit, and the control unit transmits the transmitted coordinates. is stored as the second coordinate.

Thirdly, in step S123, after rotating the table unit 200 by 120 degrees, the measuring tool 51 from the center point O of the table 210 to the outermost edge of the table 210 along the axis selected in steps S121 and S122 moves the mounted spindle 40. During the movement of the spindle 40, the X and Y coordinates of the spindle 40 when the contact between the measuring part 51b of the measuring tool 51 and the workpiece W are detected are transmitted to the control unit, and the control unit transmits the transmitted coordinates. is stored as the third coordinate.

Fourth, in step S124, based on the first to third coordinates stored in the controller, the radius of the circumscribed circle of the triangle having the three coordinates as vertices is calculated, and the inner diameter of the workpiece W is derived by doubling the radius.

Step S130 is the same as step S30 described above.

In step S140, it is determined whether the X-axis adjustment amount or the Y-axis adjustment amount calculated in step S130 exceeds a preset threshold value, and if either of the X-axis and Y-axis adjustment amounts exceeds the threshold value, step S150 is executed, When both the X-axis and Y-axis adjustment amounts are equal to or less than the threshold value, step S180 is executed.

In step S150, the centering adjustment point of the workpiece (W) is calculated.

The centering adjustment point is the center of gravity of the workpiece (W). When centering the workpiece (W), which will be described later, force is applied to the center of gravity of the workpiece (W), so that the workpiece (W) can be moved with little force without being eccentric. there is.

The centering adjustment point includes an X-axis adjustment point for moving the workpiece W in the X-axis direction by the X-axis adjustment amount, and a Y-axis adjustment point for moving the workpiece W in the Y-axis direction by the Y-axis adjustment amount. do.

When the density of the workpiece (W) is constant, the X and Y coordinate values of the coordinate values of the center of gravity of the workpiece (W) are the X and Y coordinate values of the center point (O') of the workpiece (W) calculated in step S130 and the same or similar Therefore, the Y-coordinate value of the X-axis adjustment point is equal to the Y-coordinate value of the center point (O') of the workpiece (W), and the X-coordinate value of the Y-axis adjustment point is the center point (O') of the workpiece (W). is the same as the X coordinate value of

In step S160, the tool coupled to the spindle 40 is replaced with the centering tool 52 to center the workpiece W.

Step S160 includes steps S161 and S162.

In step S161, the tool coupled to the spindle 40 is replaced with the centering tool 52. Step S171 may be performed manually, but is preferably performed through the automatic tool changer 50.

In step S162, the side surface of the support part 52a of the centering tool 52 contacts the X-axis adjustment point calculated in step S160 to press and move the workpiece W by the X-axis adjustment amount, and The side surface of the support part 52a is brought into contact with the Y-axis adjustment point calculated in step S160 to press and move the workpiece W by the Y-axis adjustment amount.

Step S160 restarts step S110 when the movement of the workpiece W is completed.

In step S170, the tool coupled to the spindle 40 is exchanged for a machining tool, and the automatic workpiece centering process is terminated.

Hereinafter, a control method of a machine tool for automatically aligning the center of a workpiece according to another embodiment of the present invention will be described. Among the configurations not described, essential configurations for constituting the invention are the same as those of the above-described embodiment of the present invention, and thus will be omitted.

In the above-described embodiments of the present invention in steps S20 and S120, since the table portion 200 of the machine tool is rotatable, the spindle 40 moves only in one axis of the X axis or the Y axis to measure the outer diameter, Each time the third coordinate is measured, the table part 200 rotates 120 degrees, but in another embodiment of the present invention, an embodiment in which the table part 200 of the machine tool is non-rotatable will be described.

A method for controlling a machine tool for automatically aligning the center of a workpiece according to another embodiment of the present invention includes the steps of exchanging the measuring tool 51 (S210) and measuring the outer diameter of the workpiece (W) (S220). And, calculating the center point and the X-axis and Y-axis adjustment amount of the workpiece W (S230), determining whether the X-axis or Y-axis adjustment amount exceeds the threshold value (S240), and the X-axis in step S240 Alternatively, if the Y-axis adjustment amount exceeds the threshold value, measuring the height of the workpiece (S250), calculating the centering adjustment point of the workpiece (S260), and performing centering by exchanging with the centering tool 52 (S270), and repeating S210 to S720 to exchange the processing tool when the X-axis or Y-axis adjustment amount does not exceed the threshold value in step S240 (S280).

Step S210 is the same as step S10 described above.

In step S220, the outer diameter of the workpiece W is measured.

Step S220 includes steps S221, S222, S223, and S224.

A method of measuring the outer diameter of the workpiece W in step S220 is as follows.

First, in step S221, on the coordinate plane of the table 210, the X-axis left direction (negative direction) outermost, X-axis right direction (positive direction) outermost, Y-axis upper direction (positive direction) outermost, By selecting any one of the outermost positions in the Y-axis downward direction (negative direction), the spindle 40 equipped with the measuring tool 51 from the outermost edge of the table 210 to the center point O of the table 210 move the During the movement of the spindle 40, the X and Y coordinates of the spindle 40 when the contact between the measuring part 51b of the measuring tool 51 and the workpiece W are detected are transmitted to the control unit, and the control unit transmits the transmitted coordinates. is stored as the first coordinate.

Second, in step S222, on the coordinate plane of the table 210, the X-axis left direction (negative direction) outermost, X-axis right direction (positive direction) outermost, Y-axis upper direction (positive direction) outermost, A measuring tool ( 51) moves the mounted spindle 40. During the movement of the spindle 40, the X and Y coordinates of the spindle 40 when the contact between the measuring part 51b of the measuring tool 51 and the workpiece W are detected are transmitted to the control unit, and the control unit transmits the transmitted coordinates. is stored as the second coordinate.

Thirdly, in step S223, on the coordinate plane of the table 210, the X-axis left direction (negative direction) outermost, X-axis right direction (positive direction) outermost, Y-axis upper direction (positive direction) outermost, Among the outermost Y-axis downward direction (negative direction), select any one position excluding the position selected in steps S221 and S222, and determine the center point (O) of the table 210 at the outermost edge of the table 210 Move the spindle 40 to which the measuring tool 51 is mounted until During the movement of the spindle 40, the X and Y coordinates of the spindle 40 when the contact between the measuring part 51b of the measuring tool 51 and the workpiece W are detected are transmitted to the control unit, and the control unit transmits the transmitted coordinates. is stored as the third coordinate.

Fourth, in step S224, based on the first to third coordinates stored in the control unit, the radius of the circumscribed circle of the triangle having the three coordinates as vertices is calculated, and the radius is doubled to derive the outer diameter of the workpiece W.

Step S230 is the same as step S30 described above.

In step S240, it is determined whether the X-axis adjustment amount or the Y-axis adjustment amount calculated in step S230 exceeds a preset threshold value, and if either of the X-axis and Y-axis adjustment amounts exceeds the threshold value, step S250 is executed, When both the X-axis and Y-axis adjustment amounts are less than or equal to the threshold value, step S280 is executed.

Step S250 is the same as step S50 described above.

Step S260 is the same as step S60 described above.

Step S270 restarts step S210, not step S10, when the movement of the workpiece W is completed. Other configurations are the same as the above-described step S70.

Step S280 is the same as step S80 described above.

Hereinafter, a control method of a machine tool for automatically aligning the center of a workpiece according to another embodiment of the present invention will be described. Among the configurations not described, essential configurations for constituting the invention are the same as those of the above-described embodiment of the present invention, and thus will be omitted.

A method for controlling a machine tool for automatically aligning the center of a workpiece according to another embodiment of the present invention includes the steps of exchanging the measuring tool 51 (S310) and measuring the inner diameter of the workpiece (W) (S320). And, calculating the center point of the workpiece W and the X-axis and Y-axis adjustment amount (S330), determining whether the X-axis or Y-axis adjustment amount exceeds the threshold value (S340), and the X-axis in step S340 Alternatively, if the Y-axis adjustment amount exceeds the threshold value, calculating the centering adjustment point of the workpiece (S350) and replacing it with the centering tool 52 to perform centering (S360), repeating S310 to S360. In step S340, if the X-axis or Y-axis adjustment amount does not exceed the threshold value, a step of exchanging with a machining tool (S370) is further included.

Step S310 is the same as step S110 described above.

In step S320, the inner diameter of the workpiece (W) is measured.

Step S320 includes steps S321, S322, S323, and S324.

The method of measuring the inner diameter of the workpiece W in step S320 is as follows.

First, in step S321, on the coordinate plane of the table 210, the X-axis left direction (negative direction) outermost, X-axis right direction (positive direction) outermost, Y-axis upper direction (positive direction) outermost, Spindle 40 equipped with measuring tool 51 from the center point O of the table 210 to the outermost edge of the table 210 by selecting any one of the outermost positions in the Y-axis downward direction (negative direction) move the During the movement of the spindle 40, the X and Y coordinates of the spindle 40 when the contact between the measuring part 51b of the measuring tool 51 and the workpiece W are detected are transmitted to the control unit, and the control unit transmits the transmitted coordinates. is stored as the first coordinate.

Second, in step S322, on the coordinate plane of the table 210, the X-axis left direction (negative direction) outermost, X-axis right direction (positive direction) outermost, Y-axis upper direction (positive direction) outermost, A measuring tool ( 51) moves the mounted spindle 40. During the movement of the spindle 40, the X and Y coordinates of the spindle 40 when the contact between the measuring part 51b of the measuring tool 51 and the workpiece W are detected are transmitted to the control unit, and the control unit transmits the transmitted coordinates. is stored as the second coordinate.

Thirdly, in step S323, on the coordinate plane of the table 210, the X-axis left direction (negative direction) outermost, X-axis right direction (positive direction) outermost, Y-axis upper direction (positive direction) outermost, Among the outermost Y-axis downward direction (negative direction), select any one position excluding the position selected in steps S321 and S322, and the outermost edge of the table 210 at the center point (O) of the table 210. Move the spindle 40 to which the measuring tool 51 is mounted until During the movement of the spindle 40, the X and Y coordinates of the spindle 40 when the contact between the measuring part 51b of the measuring tool 51 and the workpiece W are detected are transmitted to the control unit, and the control unit transmits the transmitted coordinates. is stored as the third coordinate.

Fourth, in step S324, based on the first to third coordinates stored in the control unit, the radius of the circumscribed circle of the triangle having the three coordinates as vertices is calculated, and the outer diameter of the workpiece W is derived by doubling the radius.

Step S330 is the same as step S130 described above.

Step S340 is the same as step S140 described above.

Step S350 is the same as step S150 described above.

Step S360 is the same as step S160 described above.

Step S370 is the same as step S170 described above.

Those skilled in the art to which the present invention pertains will understand that the present invention can be embodied in other specific forms without changing its technical spirit or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. The scope of the present invention is indicated by the claims to be described later rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts thereof are included in the scope of the present invention. should be interpreted

10: Bed 20: Birds
30: column 40: spindle
50: automatic tool change module 51: measuring tool
52: centering tool 100: processing device
200: table part 210: table
215: workpiece clamp 220: rotating part
W: Workpiece

Claims (13)

bed; Birds disposed on the upper side of the bed and moving relative to the bed in the left and right directions; a column disposed above the saddle and moving relative to the saddle in a forward and backward direction; a spindle installed in the column and moved in a vertical direction with respect to the column; an automatic tool changer installed in the column corresponding to the spindle and providing one of a plurality of tools to the spindle; And a table portion located in front of the saddle; in the control method of a machine tool including, wherein the plurality of tools include a processing tool, a measuring tool, and a centering tool,
A measuring tool exchange step (S10) of exchanging with the measuring tool;
Measuring the outer diameter of the workpiece (S20);
Based on the value measured in step S20, calculating the center point of the workpiece and the X-axis and Y-axis adjustment amounts (S30);
Determining whether the X-axis adjustment amount or the Y-axis adjustment amount calculated in step S30 exceeds a predetermined threshold value (S40);
When the X-axis adjustment amount or the Y-axis adjustment amount exceeds the threshold value in step S40, measuring the height of the workpiece (S50);
calculating a centering adjustment point of the workpiece based on the values calculated in steps S30 and S50 (S60); and
Including; replacing with the centering tool and performing centering (S70);
Repeating the above S10 to the above S70, when the X-axis adjustment amount and the Y-axis adjustment amount are less than or equal to the threshold value in the step S40, the step of replacing the machining tool with the processing tool (S80) Automatically aligning the center of the workpiece Machine tool control method. The method of claim 1,
In the step S20,
Selecting either the X axis or the Y axis, moving the spindle along the selected axis from the outermost edge of the table to the center point of the table, and detecting contact between the measuring tool and the workpiece during movement of the spindle Step S21 of storing the X and Y coordinates of the spindle as first coordinates;
Step S22 of rotating the table 120 degrees and then performing the same operation as step S21 to store the X and Y coordinates of the spindle when the contact between the measuring tool and the workpiece is detected as second coordinates;
Step S23 of rotating the table 120 degrees and then performing the same operation as step S21 to store the X and Y coordinates of the spindle when contact between the measuring tool and the workpiece is detected as third coordinates;
Based on the first to third coordinates stored in steps S21 to S23, calculating the radius of the circumscribed circle of the triangle having the three coordinates as vertices, and doubling the radius to derive the outer diameter of the workpiece S24 step; Control method of a machine tool that automatically aligns the center of a workpiece including a. The method of claim 2,
In the step S30,
Step S31 of deriving a center point of the workpiece by calculating coordinates of the circumcenter of a triangle having the three coordinates as vertices based on the first to third coordinates measured in step S20;
S32 step of calculating the X-axis adjustment amount and the Y-axis adjustment amount by calculating the difference between the X, Y coordinate values of the center point of the workpiece and the X, Y coordinate values of the center point of the table; automatically aligning the center of the workpiece including Control method of machine tool to do.
The method of claim 1,
In step S50, the spindle on which the measuring tool is mounted is moved downward from the highest position to an arbitrary position inside the outer diameter of the workpiece based on the center point of the workpiece calculated in step S30, and movement of the spindle Stores a length value obtained by subtracting the Z coordinate value of the upper surface of the workpiece clamp from the Z coordinate value of the spindle when the contact between the measuring tool and the workpiece is detected as a first height,
A method of controlling a machine tool for automatically aligning the center of a workpiece by repeating step S50 N times and storing the length value stored when performing step S50 N times as the N-th height.
The method of claim 4,
The step S60 calculates the Y, Z coordinates of the X-axis adjustment point for moving the workpiece by the X-axis adjustment amount, and the X, Z coordinates of the Y-axis adjustment point for moving the workpiece by the Y-axis adjustment amount. A control method of a machine tool that automatically aligns the center of a workpiece. The method of claim 5,
In step S60, the Y coordinate of the X-axis adjustment point is the Y coordinate of the center point of the workpiece calculated in step S30, and the X coordinate of the Y-axis adjustment point is the X coordinate of the center point of the workpiece calculated in step S30. is,
The Z coordinate of the X-axis adjustment point and the Y-axis adjustment point is the center of the workpiece having the Z coordinate value of a point half of the average height by calculating the average height of the first to Nth heights measured in step S50. A control method for automatically aligning machine tools. The method of claim 6,
In the step S70,
Step S71 of exchanging the tool coupled to the spindle with the centering tool;
The workpiece is moved by the X-axis adjustment amount by contacting the end of the push part of the centering tool with the X-axis adjustment point, and by the Y-axis adjustment amount by contacting the end of the push part of the centering tool with the Y-axis adjustment point. Control method of a machine tool for automatically aligning the center of a workpiece including; S72 step of moving the workpiece. bed; Birds disposed on the upper side of the bed and moving relative to the bed in the left and right directions; a column disposed above the saddle and moving relative to the saddle in a forward and backward direction; a spindle installed in the column and moved in a vertical direction with respect to the column; an automatic tool changer installed in the column corresponding to the spindle and providing one of a plurality of tools to the spindle; And a table portion located in front of the saddle; in the control method of a machine tool including, wherein the plurality of tools include a processing tool, a measuring tool, and a centering tool,
A measuring tool exchange step (S110) of exchanging with the measuring tool;
Measuring the inner diameter of the workpiece (S120);
Based on the value measured in step S120, calculating the center point of the workpiece and the X-axis and Y-axis adjustment amounts (S130);
determining whether the X-axis adjustment amount or the Y-axis adjustment amount calculated in step S130 exceeds a predetermined threshold value (S140);
If the X-axis adjustment amount or the Y-axis adjustment amount exceeds the threshold value in step S140, calculating a centering adjustment point of the workpiece based on the value calculated in step S130 (S150); and
Including; replacing with the centering tool and performing centering (S160);
When the X-axis adjustment amount and the Y-axis adjustment amount are less than or equal to the threshold value in the step S140 by repeating the steps S110 to S160, replacing the machining tool with the processing tool (S170) for automatically aligning the center of the workpiece. control method. The method of claim 8,
In the step S120,
Selecting either the X axis or the Y axis, moving the spindle along the selected axis from the center point of the table to the outermost edge of the table, and detecting contact between the measuring tool and the workpiece during movement of the spindle Step S121 of storing the X and Y coordinates of the spindle as first coordinates;
After rotating the table by 120 degrees, performing the same operation as in step S121 to store the X and Y coordinates of the spindle when the contact between the measuring tool and the workpiece is detected as second coordinates S122;
After rotating the table by 120 degrees, performing the same operation as in step S121 to store the X and Y coordinates of the spindle when the contact between the measuring tool and the workpiece is detected as third coordinates S123;
Based on the first to third coordinates stored in steps S121 to S123, calculating the radius of the circumscribed circle of the triangle having the three coordinates as vertices, and doubling the radius to derive the inner diameter of the workpiece S124 step; Control method of a machine tool that automatically aligns the center of a workpiece including a. The method of claim 9,
In step S130,
Step S131 of deriving a center point of the workpiece by calculating coordinates of the circumcenter of a triangle having the three coordinates as vertices based on the first to third coordinates measured in step S120;
S132 step of calculating the X-axis adjustment amount and the Y-axis adjustment amount by calculating the difference between the X, Y coordinate values of the center point of the workpiece and the X, Y coordinate values of the center point of the table; automatically aligning the center of the workpiece including Control method of machine tool to do. The method of claim 8,
The step S150 calculates the Y coordinate of the X-axis adjustment point for moving the workpiece by the X-axis adjustment amount and the X coordinate of the Y-axis adjustment point for moving the workpiece by the Y-axis adjustment amount. A control method of a machine tool that automatically aligns The method of claim 11,
In step S150, the Y coordinate of the X-axis control point is the Y coordinate of the center point of the workpiece calculated in step S130, and the X coordinate of the Y-axis control point is the X coordinate of the center point of the workpiece calculated in step S130. A control method of a machine tool that automatically aligns the center of a human workpiece. The method of claim 12,
In the step S160,
Step S161 of exchanging the tool coupled to the spindle with the centering tool;
The workpiece is moved by the X-axis adjustment amount by contacting the side surface of the support part of the centering tool with the X-axis adjustment point, and by the Y-axis adjustment amount by contacting the Y-axis adjustment point with the side surface of the support part of the centering tool. Control method of a machine tool for automatically aligning the center of a workpiece including; S162 step of moving the workpiece.

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