KR101716126B1 - Method for controlling machine tool - Google Patents

Abstract

According to the present invention, a control method for a machine tool comprises: (S310) a step of turning on a synchronous control; and a step of turning on a synchronous control of a position control unit (61) of a first spindle (41) and a second spindle (42) after step (S310), and turning on a synchronous control of a rotational speed control unit (62) of the first spindle (41) and the second spindle (42). The rotational speed and the transfer speed of tools mounted on the first spindle (41) and the second spindle (42) are controlled to be the same. The control method of a machine tool synchronizes a plurality of spindles in order for a rigid tap processing to simultaneously be performed on each pallet.

Description

[0001] The present invention relates to a method for controlling a machine tool,

To a control method of a machine tool of the present invention.

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

Such a machining center is generally divided into a vertical machining center in which a main shaft is vertically mounted and a horizontal machining center in which a main shaft is horizontally mounted.

The vertical machining center includes a bed, a table installed on the upper part of the bed, a table on which the work is placed, a column vertically mounted on the rear of the bed, and a spindle mounted on the column.

That is, the vertical machining center is configured to machine a workpiece placed on a table while being moved in a horizontal direction and a vertical direction with a cutting tool installed on the spindle.

At this time, the spindles may be constituted only by one, but in general, a plurality of spindles may be arranged to process a plurality of workpieces at the same time.

Korean Patent Publication No. 10-2013-0019345

An object of the present invention is to provide a control method of a machine tool having a plurality of spindles.

An object of the present invention is to provide a method of controlling a machine tool capable of performing rigid tapping on a plurality of pallets by synchronizing a plurality of spindles.

An object of the present invention is to provide a control method of a machine tool capable of shortening a machining time of an object by synchronizing a plurality of spindles.

An object of the present invention is to provide a control method of a machine tool capable of simultaneously processing each object formed with different elevations.

The invention relates to a bed (10); A saddle (20) disposed above the bed (10) and relatively movable in the left and right direction with respect to the bed (10); A column 30 disposed above the saddle 20 and relatively movable in the forward and backward direction with respect to the saddle 20; A first spindle 41 installed in the column 30 and moved up and down with respect to the column 30; A second spindle (42) installed in the column (30) and moving up and down with respect to the column (30) separately from the first spindle (41); At least two columns are provided in the column 30 corresponding to the first spindle 41 or the second spindle 42 and one of the plurality of tools is disposed on the first spindle 41 or the second spindle 42 A step (S310) in which the synchronous control is turned on (S310); The position control unit 61 of the first spindle 41 and the second spindle 42 is synchronously controlled to be turned ON after the step S310 and the rotation of the first spindle 41 and the second spindle 42 (S320) of synchronizing control ON of the speed control unit (62), wherein the rotational speed and the feed speed of the tool mounted on the first spindle (41) and the second spindle (42) do.

After the step S320, the tool offset command is confirmed (S330). If the tool offset command is present, the method may further include a tool offset applying step (S350) of applying the tool offset after temporarily turning off the synchronous control in step S320 and turning on the synchronous control again.

The tool offset applying step S350 may include turning off the synchronization control of step S320 (S352); (S354) applying a tool length offset to at least one of the tools of the first spindle (41) or the second spindle (42); And turning on the synchronization control again after the step S354 (S356).

(S340) of confirming a tool change command when the tool offset command is not present in step S330; and temporarily turning off the synchronization control of step S320 if there is the tool change command (S340) And a tool change step (S360) of replacing the tool and turning on the synchronization control again (ON).

The tool exchange step S360 temporarily suspends the synchronization control in step S320 and cancels the tool offset in step S330 (S362). Moving at least one of the first spindle or the second spindle to a tool change point for replacing the tool, and replacing the tool mounted on the moved spindle (S364).

The invention relates to a bed (10); A saddle (20) disposed above the bed (10) and relatively movable in the left and right direction with respect to the bed (10); A column 30 disposed above the saddle 20 and relatively movable in the forward and backward direction with respect to the saddle 20; A first spindle 41 installed in the column 30 and moved up and down with respect to the column 30; A second spindle (42) installed in the column (30) and moving up and down with respect to the column (30) separately from the first spindle (41); At least two columns are provided in the column 30 corresponding to the first spindle 41 or the second spindle 42 and one of the plurality of tools is disposed on the first spindle 41 or the second spindle 42 And an automatic tool changing module (50) for providing the automatic tool changing module (50)

A step S310 in which synchronous control is turned ON; The position control unit 61 of the first spindle 41 and the second spindle 42 is synchronously controlled to be turned ON after the step S310 and the rotation of the first spindle 41 and the second spindle 42 A step S320 of turning on the speed control section 62 synchronously; After the step S320, the tool offset command is confirmed (S330). A tool offset applying step (S350) of applying the tool offset after turning off the synchronous control of the step S320 and turning on the synchronous control when the tool offset instruction is present; If the tool offset command does not exist in step S330, the tool change command is confirmed (S340). And a tool exchange step (S360) of, if there is the tool exchange command (S340), temporarily switching off the synchronization control in the step S320, exchanging the tool, and turning on the synchronization control again ,

The tool offset applying step S350 may include turning off the synchronization control of step S320 (S352); (S354) applying a tool length offset to at least one of the tools of the first spindle (41) or the second spindle (42); And a step (S356) of turning on the synchronization control again after the step S354,

The tool exchange step S360 temporarily suspends the synchronization control in step S320 and cancels the tool offset in step S330 (S362). Moving at least one of the first spindle or the second spindle to a tool change point for replacing the tool, and replacing the tool mounted on the moved spindle (S364).

The present invention has the following effects.

First, there is an advantage that a plurality of spindles can be synchronized to perform rigid tap processing on each pallet.

Second, when a plurality of spindles are operated synchronously, there is an advantage that the distance between the tool and the object can be matched in each pallet.

Third, when a plurality of spindles are synchronized and operated, there is an advantage in that, when a tool change command is transmitted to at least one of a plurality of tools, it can be controlled.

Fourth, since a plurality of spindles can be synchronized, the machining time can be shortened and machining can be performed through a general three-axis program.

1 is a perspective view of a machine tool having a plurality of spindles according to an embodiment of the present invention.
2 is a front view of Fig.
3 is a right side view of Fig.
4 is a plan view of Fig.
5 is a right side view in which the automatic tool changer module is not shown in Fig.
Fig. 6 is a schematic configuration diagram of Fig. 2. Fig.
Fig. 7 is a schematic configuration diagram of Fig. 5. Fig.
Fig. 8 is a schematic configuration diagram of Fig. 4. Fig.
9 is a flowchart showing a control method of a machine tool for automatic position correction of a tool.
10 is a flowchart showing a control method of a machine tool for manual position correction of a tool.
Fig. 11 is an exemplary view showing processing in two pallets. Fig.
Fig. 12 is a flowchart showing a control method of the machine tool when operated with synchronization on.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

A machine tool having a plurality of spindles will be described with reference to Figs. 1 to 8 and Fig.

The machine tool according to the present embodiment includes a machining apparatus 100 for simultaneously processing a plurality of objects, and a turntable 200 for simultaneously loading and unloading the plurality of objects.

The processing apparatus 100 includes a bed 10, a saddle 20 disposed on the bed 10 and relatively moved in the left and right direction with respect to the bed 10, And a plurality of spindles (40) disposed on the column (30) and relatively movable with respect to the column (30) in a vertical direction, the column (30) And an automatic tool changer module 50 mounted on the column 30 and mounted with a plurality of tools and coupling any one of the tools to the spindle 40.

The bed 10 is fixed to the paper side.

The saddle 20 is disposed above the bed 10.

The saddle 20 is relatively moved in the lateral direction from above the bed 10.

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

The saddle 20 is seated on the saddle guide and moved in the left and right direction.

And a saddle drive unit (not shown) for moving the saddle 20 in the left and right direction.

The column 30 is disposed above the saddle 20.

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

Between the column 30 and the saddle 20, a column guide 35 for guiding the moving direction of the column 30 is disposed. The column guide 35 may be an LM guide.

And a column driver (not shown) for moving the column 30 in the forward and backward directions.

The spindle (40) is installed in the column (30).

The spindle 40 is installed in the column 30 and can be moved up and down. Between the spindle 40 and the column 30, a spindle guide 45 for guiding the moving direction of the spindle 40 is provided.

The spindle guide 45 may be an LM guide.

The spindle 40 includes a spindle shaft 43 for providing rotational force to the tool, a shaft driving unit 44 for providing a rotational force to the spindle shaft 43, and a spindle 40 And a position drive section 46 for moving the workpiece W in the vertical direction.

The spindle shaft 43 may be provided with power transmission parts for transmitting power to the tool, and detailed description thereof will be omitted because it is a general technique to those skilled in the art.

The shaft driving unit 44 and the position driving unit 46 are provided with respective motors.

In this embodiment, the spindle disposed on the left side is defined as the first spindle 41 and the spindle disposed on the right side is defined as the second spindle 42 for the sake of explanation.

The first spindle 41 and the second spindle 42 have the same configuration. The first spindle 41 includes a first spindle shaft 43-1, a first shaft driver 44-1, a first spindle guide 45-1, and a first position driver 46-1.

The second spindle 42 includes a second spindle shaft 43-2, a second shaft driver 44-2, a second spindle guide 45-2, and a second position driver 46-2.

The first axis driving part 44-1 and the second axis driving part 44-2 can be individually controlled or synchronously controlled.

The first position drive section 46-1 and the second position drive section 46-2 can be individually controlled or synchronously controlled.

The automatic tool change module (50) is installed in the column (30).

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

In the present embodiment, a plurality of spindles 40 are provided, and the automatic tool changing module 50 is installed on the left and right sides of the column 30, respectively.

A plurality of tools are installed in the automatic tool changer module (50).

Thus, the spindle 40 can be continuously machined by receiving the tools of the automatic tool changer module 50.

The spindles 40 replace the tool in each automatic tool changer module 50.

Each of the automatic tool changer modules 50 is provided with a distance detecting tool (not shown) for detecting the height of the automatic tool changer module 50 with respect to a processing plate (not shown) on which an object is placed.

In the present embodiment, the automatic tool changer module 50 is of a rotary type, and one of the tools can be coupled with the spindle 40 by rotating a plurality of tools.

The process and structure of assembling the tool to the automatic tool change module 50 are generally known to those skilled in the art, so a detailed description thereof will be omitted.

Further, since the operation structure of the saddle drive unit, the column drive unit, and the spindle drive unit is generally known to those skilled in the art, a detailed description thereof will be omitted.

The turntable 200 includes a turn bed 210 and a rotation unit 220 for rotating the turn bed 210.

The turn-bed 210 may be divided into at least two zones.

In this embodiment, the turn-bed 210 is divided into a first zone 211 and a second zone 212.

A partition plate 215 may be provided to partition the first and second sections 211 and 212.

The first zone 211 and the second zone 212 are divided based on the partition plate 215 but do not refer to a specific area of the turnbee 210.

That is, in the present embodiment, the second zone 212 is where the object is machined, and the first zone 211 is where the object is loaded or unloaded.

Since the turn bed 210 is rotated by 180 degrees, the second section 212 refers to the processing apparatus 100 side in the partition plate 215.

The first zone 211 refers to the opposite side of the second zone 212 with respect to the partition plate 215.

So that processing of the object 240 occurs only in the second zone 212.

Loading or unloading of the object 240 occurs only in the first zone 211.

The partition plate 215 prevents workpieces from splashing when the work is processed in the other area, and protects the worker holding the object 240.

Unlike the present embodiment, the turn-bed 210 may be divided into three or four zones.

The turntable 200 is rotated 180 degrees when the object 240 is processed, and the unprocessed object loaded in another area is moved to the work area.

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

The turn bed 210 is located in front of the saddle 20.

The rotation unit 220 is a device that rotates the turn-bed 210 by providing power.

The rotation unit 220 uses a motor in the present embodiment.

Power transmission members (not shown) may be disposed between the turn bed 210 and the motor to rotate the turn bed 210 using the rotational force of the motor.

The power transmitting members may be variously embodied such as a belt-pulley structure, a gear structure, and a chain structure. Further, the motor may be directly connected to the turn-bed 210, and the turn-bed 210 may be rotated by the rotational force of the motor.

A plurality of objects 240 may be loaded on the turn-bed 210 to perform processing.

In order to shorten the loading and unloading time, a plurality of objects are disposed on the pallet 230 on which the plurality of objects 240 are placed.

A pallet 230 corresponding to the number of the spindles 40 may be disposed in each of the zones 211 and 212.

So that two pallets 230 are loaded in the first zone 211 in the arrangement direction of the spindle 40. Two pallets 230 are also loaded in the second zone 212 in the arrangement direction of the spindle 40 .

The pallets 230 are preferably fixed to the turnbeds 210 in order to suppress movement during processing.

The pallet 230 may be fixed to the turn-bed 210 through fastening means such as a bolt or a clamp.

A pallet corresponding to the first spindle 41 is defined as a first pallet 231 and a pallet corresponding to the second spindle 42 is defined as a second pallet 232. [

The same number of objects 240 are disposed on the first pallet 231 and the second pallet 232.

The first and second spindles 41 and 42 simultaneously process the respective objects 240 disposed on the first and second pallets 231 and 232.

For example, when machining the first object of the first pallet 231, the first object of the second pallet 232 is also machined simultaneously.

Next, when the first and second spindles 41 and 42 are moved in the lateral direction and the second object of the first pallet 231 is operated, the second object of the second pallet 232 is processed .

As described above, in this embodiment, the objects of the pallets 231 and 232 are paired and processed, thereby shortening the processing time of the objects.

When processing is performed in the second zone 212, loading or unloading of the object 240 is performed in the first zone 211.

In the present embodiment, the object 240 is disposed on the pallet, and the first and second pallets 231 and 232 before the processing are loaded in the first area 211.

After the machining is finished, when the turn bed 210 is rotated 180 degrees, the first and second pallets 231 and 232 after machining are unloaded in the first zone 211.

Thus, the machine tool according to the present embodiment can minimize the time required from the machining of the object to the restart of machining.

A method of controlling a machine tool having a plurality of spindles will be described with reference to Figs. 9 to 13. Fig.

FIG. 9 or 10 is a flowchart showing a control method for synchronization off.

A method of controlling a machine tool according to the present invention includes loading a subject 240 in a first zone 211 and moving a subject 240 in the first zone 211 into a second zone 212, (S30) of determining whether or not the tool replacement is necessary, a step S40 of measuring the height of each object placed on each pallet when the tool is suitable for machining, (S50) of determining whether the measured value is within the machining standard, determining whether the measured value is within the machining standard, whether or not the correction for each object is necessary based on the value measured in the step S40 (S60 And processing the object 240 after step S60 (S70).

The step S10 is a step of loading the object 240 into the turn bed 210 of the first zone 211. [

In this embodiment, the pallet 230 on which the four objects 240 are disposed is fixed to the first area.

The step S10 may be performed manually or through a separate robot.

In step S20, the turn bed 210 is rotated 180 degrees to move the pallet 230 disposed in the first area 211 to the second area 212 and the pallet 230 disposed in the second area 212 230) to the first zone (211).

Two pallets 231 and 232 are disposed in each of the zones 211 and 212 so that a plurality of pallets 230 are moved to different zones.

In step S30, it is determined whether or not the tool is replaced to process the object 240. [

That is, since different tools are required depending on the machining step of the object 240, it is confirmed whether or not the machining step and the tool coincide with each other.

If the tool is not to be replaced in step S30, the process goes to step S40. In step S35, the tool length is measured and corrected when the tool is replaced.

In step S35, the length correction of the tool may be performed by various methods.

In this embodiment, after the tool is mounted, the spindles 41 and 42 are lowered to the reference jig (not shown) of the turn bed 210, and the length of the tool that has been replaced is calculated by calculating the lowered length.

That is, the length of the tool can be inversely calculated by subtracting the vertical stroke of the first spindle 41 from the distance from the falling start position to the reference jig. The second spindle 41 can calculate the length of the tool in the same way.

Then, the controller 60 corrects the stroke of the object on the tool length.

For example, when the length of the tool is longer than the reference value, the upper and lower strokes are corrected by the difference to prevent erroneous machining of the object.

In addition, when the length of the tool is shorter than the reference value, the vertical stroke is corrected by the difference to prevent erroneous machining or unprocessing of the object.

When the tool is initially mounted on the automatic tool changer module 50, the length varies depending on the depth of the bite. After the tool is mounted on the automatic tool changer module 50, the wear progresses gradually according to the number of times or the period of use.

Therefore, it is also possible to estimate the length of wear by measuring the length of the tool only once and calculating the use time.

In step S35, measurement and correction of the length of the tool are performed on both the first spindle 41 and the second spindle 42. [

In step S40, the height of each object 240 disposed on each of the pallets 231 and 232 is measured.

As shown in FIG. 11, when a plurality of objects 240 are disposed on one pallet 230, the height of each object 240 may be slightly different.

This may be an error generated in the pallet 230 or an error of the object 240 itself.

Also, in the tool for machining the object 240, an error due to abrasion may occur, and an error generated in the tool may also be corrected.

That is, after the pallet 230 and the object 240 are stacked on the turnbeds 210 in order, the height of the object to be processed may be different for each object. If the object 240 is processed without considering it, .

In addition, the objects arranged in the two pallets 231 and 232 are sequentially moved while being moved in the left and right direction. If the height of each object is individually measured, the required time is increased.

In step S40, the height of each of the plurality of objects arranged on the pallets 231 and 232 is measured.

The method of measuring the height of the object may be variously implemented.

In the present embodiment, the automatic tool changer 50 is provided with a measuring tool (not shown) for measuring the height.

Each of the first and second spindles 41 and 42 is provided with a measuring tool and the first and second spindles 41 and 42 are moved up and down to contact the respective objects 240, Can be measured.

The spindles 41 and 42 sequentially measure the height of each of the objects 240 placed on the pallets 231 and 232 while sequentially moving in the left or right direction.

When the first spindle 41 measures the height of the object 240 disposed on the outer edge of the first pallet 231, the second spindle 42 is positioned on the outer edge of the second pallet 232 The height of the placed object 240 is measured.

Thereafter, after the saddle 20 is moved a predetermined distance to the right, the first spindle 41 and the second spindle 42 measure the height of the second object of each pallet, respectively.

The current height of the objects placed on each of the pallets 231 and 232 is measured and stored sequentially.

In step S50, it is determined whether the value measured in step S40 is within a machining standard.

If it is out of the above-mentioned machining standard, it is treated as defective (S55)

If it is within the processing standard, it is determined in step S60 whether correction for each object is necessary.

If it is determined in step S60 that correction for each object is not required, processing is immediately started.

If it is determined in step S60 that correction for each object is necessary, the process proceeds to step S65.

In step 65, a correction value is calculated in consideration of the length of the tool and the height of the object.

The length of the tool may be measured in step S35 or may be a previously stored value.

The height of the object is the value measured in step S40.

In step S65, a correction value is calculated by summing the length of the tool and the height of the object.

The correction values calculated in S65 are individually applied to the respective objects 240 of the respective pallets 231 and 232.

Thus, even if the height of each object of the first pallet 231 and the second pallet 232 is different from each other, as shown in Fig. 11, each object 240 can be accurately processed through the correction value.

For example, in the first machining, the object of the first pallet 231 is located on the reference plane, but the object of the second pallet 232 is located lower than the reference plane.

However, when the correction value for the first object is applied, the first spindle 41-1 is moved to the reference plane, and the second spindle 42-1 is formed with a longer upper and lower stroke, 2 pallet 232. In this embodiment,

That is, the machine tool according to the present embodiment can simultaneously process objects having different elevations.

(41-3) 41-4 and the second spindle 42-2 (42-3) by applying the respective correction values in the second machining, the third machining, and the fourth machining 42-4 can be corrected.

In the present invention, after all the objects of each pallet 231 and 232 are processed, the turn bed 210 is rotated by 180 degrees, and the unprocessed object disposed in the first area is directly placed in the second area can do.

That is, the present invention can maximize processing time in the second zone 212 by using the turntable 200.

In the first zone 211, since the unloading of the processed object and the loading of the unprocessed object are performed during the processing time, the time for stopping the processing can be minimized.

On the other hand, in the present embodiment, a step of measuring the height of each object in the machining apparatus 100 is implemented. However, unlike the present embodiment, after the height of each object is measured in the first area where the object is loaded, It is also possible to transmit it to the apparatus 100. That is, a separate measuring device (not shown) for measuring the height of each object on each palette is provided in the first area, and the height of the objects can be measured through the measuring device.

In this case, the control process in the machining apparatus can be shortened to further improve the machining speed.

Since the measuring apparatus can be generally implemented or purchased by a person skilled in the art, a detailed description thereof will be omitted.

When the synchronization is off, the rotation speeds of the first spindle 41 and the second spindle 42 may be different. When the synchronization is off, the heights of the first spindle 41 and the second spindle 42 may be different.

That is, when the synchronization is turned off, the same control signal is transmitted to the first spindle 41 and the second spindle 42, and they can be driven independently of each other.

When the synchronization is turned off, sufficient time is provided according to the operation of the first spindle 41 and the second spindle 42, so that sufficient machining can be performed.

When the synchronization is turned off, the first spindle 41 and the second spindle 42 process the pallets 231 and 232, respectively, and the processing contents thereof may be different.

For example, when the first spindle 41 and the second spindle 42 perform hole machining, the processing depth of the first spindle 41 and the processing depth of the second spindle 42 can be processed differently.

That is, even if the hole machining is performed at the same position, the contents may be different.

Further, another tool may be installed on the first spindle 41 and the second spindle 42. [

For example, a larger diameter drill may be installed on the second spindle 42 than the first spindle 41. The rotational speeds of the first spindle 41 and the second spindle 42 can be set to be different even if they are simultaneously moved in the vertical direction at the same position.

And can also stop one of the first spindle 41 and the second spindle 42 at the time of synchronization off. When replacing a tool or equipment, only the operative spindle can be activated and the other spindle stopped.

In this case, it is possible to perform the minimum work while securing the safety of the operator.

10 is a flowchart showing a control method of a machine tool having a plurality of spindles according to a second embodiment of the present invention.

The present embodiment is characterized in that the method of manually inputting data is included as compared with the control method of the first embodiment.

The control method of a machine tool according to the present invention includes a step of receiving a tool length (S130), a step (S132) of determining whether tool correction is necessary by determining the tool length of step S130, A step S40 of measuring the height of each object placed on each palette when it is not necessary, a step S60 of determining whether correction is necessary for each object through the value measured in the step S40, And then processing the object 240 (S70).

The length of the tool in step S130 may be input through a separate measuring device (not shown).

The length of the tool in step S130 can be input by a manual measurement value of the operator.

The step S130 may be performed in the first zone 211 where the object is loaded or unloaded.

In step S132, it is determined whether the length of the tool needs to be corrected through the input value.

If the length correction of the tool is required in step S132, the length correction value of the tool is input (S134)

After the length correction value of the tool is input in step S134, the process proceeds to step S40.

Since steps S40, S60, and S70 are the same as those of the first embodiment, the detailed description will be omitted.

If it is determined in step S60 that correction for each object is required, the process proceeds to step S65. If correction for each object is not required, the process proceeds to step S70.

A control method of the machine tool in synchronization will be described with reference to FIG. 12 or FIG.

The synchronous control is turned ON in step S310 and the position control part 61 of the first spindle 41 and the second spindle 42 is synchronously controlled ON in step S310, (S320) of synchronously controlling the rotation speed of the first spindle (41) and the rotation speed of the second spindle (42) (S320); checking the tool offset command (S330) after step S320; A tool offset applying step (S350) of applying a tool offset after the synchronous control is temporarily turned off (OFF) and then turning on the synchronous control (ON) when there is an offset command; A tool exchange step S360 in which the tool is exchanged after the synchronous control is temporarily turned OFF and the synchronous control is again turned ON when the tool exchange command S340 is present, .

In step S310, the synchronization control may be selected by the user.

The user can turn on the synchronous control by operating the control panel (not shown) of the machine tool, and in this case, step S310 is performed.

In step S320, the first spindle 41 and the second spindle 42 are synchronized. The controller 60 synchronizes the elevations corresponding to the positions of the first spindle 41 and the second spindle 42 in step S320.

In step S320, the controller 60 synchronizes the rotation speeds of the first spindle 41 and the second spindle 42 with each other.

When the positions and rotational speeds of the first spindle 41 and the second spindle 42 are synchronized, rigid tapping can be performed. Rigid tapping is called rigid tapping and is also referred to as synchronous tapping. The rigid tapping process is to control the ratio of the rotational speed of the tool to the feed rate constantly.

When the first spindle 41 and the second spindle 42 are not synchronized with each other in a machine tool equipped with a plurality of spindles 41 and 42 as in the present embodiment, Can not be performed.

If the rigid tapping process is performed without synchronously controlling the first spindle 41 and the second spindle 42, the tool is broken or defective.

The step S320 includes synchronizing control of the first axis driver 44-1 and the second axis driver 44-2.

In operation S320, the first position driver 46-1 and the second position driver 46-2 include synchronous control.

Rigid tap processing can be simultaneously performed on a plurality of pallets through synchronous control of the axis driving units 44 and the position driving units 46.

If there is no separate command, step S320 is maintained.

The control unit 60 includes a position control unit 61 for controlling the positions of the saddle 20, the column 30 and the spindle 40, a rotation speed control unit 62 for controlling the rotation speed of the shaft driving unit 44, And a turntable control unit 65 for controlling the turntable 200. The turntable control unit 63 controls the position and the rotation of the turntable 200,

In step S320, the position controller 61 synchronously controls the first axis driver 44-1 and the second axis driver 44-2.

The position control unit 61 controls the elevation Z axis of the first axis driving unit 44-1 and the second axis driving unit 44-2. The height of the first spindle is defined as Z1, and the height of the second spindle is defined as Z2.

The position controller 61 can control the positions of the saddle 20 and the column 30 in conjunction with the first and second axis drivers 44-1 and 44-2 .

In step S320, the rotation speed controller 62 synchronously controls the first spindle axis 43-1 and the second spindle 43-2. The rotation speed of the first spindle shaft 43-1 is defined as S1 and the rotation speed of the second spindle shaft 43-2 is defined as S2.

The step S330 confirms the tool offset command.

When a tool offset command is input, the process proceeds to a tool offset applying step (S350). If a tool offset command is not input, the tool change command is confirmed.

The tool offset applying step S350 includes a step S352 of turning off the synchronous control and a step of applying a tool length offset to at least one of the tools of the first spindle 41 or the second spindle 42 And turning on synchronization control again after step S354 (S356).

In order to apply the tool offset, the synchronous control is turned off to release the interlocking of the first axis driving unit 44-1 and the second axis driving unit 44-2, and a tool offset for the tool is applied. Therefore, only the position of the spindle on which the tool is mounted is adjusted. After the tool offset is applied, synchronization control is turned on again.

If the tool change command is input in the tool change command confirmation step S340, the process proceeds to the tool change step S360, and if not, the synchronization control is maintained.

The tool change step S360 includes turning off the synchronous control and canceling the tool offset (S362), and moving the tool to the tool change point for tool change (S364).

If a tool change is input for at least one of the first spindle 41 or the second spindle 42, synchronous control off and tool offset canceling of the tool must be performed.

When the synchronous control is kept on and the tool change is performed, a tool change is carried out for both tools to make an unnecessary tool change.

Tool offset cancellation applies only to the spindle with the tool to be replaced.

Wear of tools mounted on a plurality of spindles may appear differently, and there is a need to replace only one tool. At this time, in order to replace the tool, the synchronous control is turned off, the tool offset of the spindle is canceled, and the tool is exchanged.

The tool offset can then be applied again to the spindle on which the tool has been replaced.

The control method of FIG. 9 or 10 may be applied to the control method of the machine tool according to the above-described synchronous control.

That is, when the synchronous control is maintained, automatic position correction of the tool can be performed.

Also, when synchronous control is maintained, manual position correction of the tool can be performed.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning and range of the claims and the equivalents thereof are included in the scope of the present invention Should be interpreted.

10: Bed 20: Saddles
30: Column 40: Spindle
50: automatic tool changing module 60:
61: position control section 62: rotation speed control section
63: tool replacement control section 64:
65: turntable control unit 100:
200: turntable 210: turnbeds
211: first zone 212: second zone
215: partition plate 220:
230: Pallet 231: First pallet
232: second palette 240: object

Claims (6)

A bed 10; A saddle (20) disposed above the bed (10) and relatively movable in the left and right direction with respect to the bed (10); A column 30 disposed above the saddle 20 and relatively movable in the forward and backward direction with respect to the saddle 20; A first spindle 41 installed in the column 30 and moved up and down with respect to the column 30; A second spindle (42) installed in the column (30) and moving up and down with respect to the column (30) separately from the first spindle (41); At least two columns are provided in the column 30 corresponding to the first spindle 41 or the second spindle 42 and one of the plurality of tools is disposed on the first spindle 41 or the second spindle 42 And an automatic tool changing module (50) for providing the automatic tool changing module (50)
A step S310 in which synchronous control is turned ON;
The position control unit 61 of the first spindle 41 and the second spindle 42 is synchronously controlled to be turned ON after the step S310 and the rotation of the first spindle 41 and the second spindle 42 A step S320 of turning on the speed control section 62 synchronously;
After the step S320, the tool offset command is confirmed (S330).
A tool offset applying step (S350) of applying the tool offset after turning off the synchronous control of the step S320 and turning on the synchronous control when the tool offset instruction is present;
If the tool offset command does not exist in step S330, the tool change command is confirmed (S340).
A tool exchange step (S360) of, if there is the tool change command (S340), temporarily switching off the synchronization control in step S320, exchanging the tool, and turning on the synchronization control again;
The tool offset applying step (S350)
Turning off synchronization control of step S320 (S352); (S354) applying a tool length offset to at least one of the tools of the first spindle (41) or the second spindle (42); And a step (S356) of turning on the synchronization control again after the step S354,
The first spindle (41)
A first spindle shaft 43-1, a first shaft driver 44-1, a first spindle guide 45-1, and a first position driver 46-1,
The second spindle (42)
A second spindle shaft 43-2, a second shaft driver 44-2, a second spindle guide 45-2, and a second position driver 46-2,
When rigid-tapped,
In step S320, the rotational speeds of the first spindle shaft 43-1 and the second spindle shaft 43-2 are synchronized,
The first position drive unit 46-1 and the second position drive unit 46-2 are synchronized to move the first spindle shaft 43-1 and the second spindle shaft 43-2 Synchronize speed,
And controlling synchronization of the first spindle and the second spindle such that a ratio of the rotational speed and the moving speed is constant.
delete delete delete The method according to claim 1,
In the tool change step S360,
Temporarily suspending synchronization control in step S320 and canceling the tool offset in step S330 (S362);
Moving at least one of the first spindle or the second spindle to a tool change point for replacing the tool, and replacing the tool mounted on the moved spindle (S364).
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