KR20210101995A - Machine tool and controlling method of machine tool - Google Patents

Abstract

The present invention relates to a machine tool and a controlling method thereof. The machine tool can: automatically distribute the number of revolutions of the main spindle and a sub-spindle according to a target value of the number of revolutions desired by an operator; rotate the main spindle and the sub-spindle in opposite directions by the number of rotations automatically distributed in the best condition according to condition of equipment; performs various machining including turning process of a workpiece according to performing high-speed rotation at a turning center; reduce a manufacturing cost of the equipment by increasing utilization and compatibility of the turning center; reduce a maintenance cost by minimizing introduction of separate equipment; maximize space utilization by promoting miniaturization of the equipment; and maximize safety and reliability of the machine tool.

Description

Machine tool and controlling method of machine tool

The present invention relates to a machine tool and a method for controlling a machine tool, and more particularly, by distributing the number of rotations of the main spindle and the sub-spindle according to a target value, and rotating the main spindle and the sub-spindle in opposite directions by the divided number of rotations. It relates to a machine tool and a control method of a machine tool that can perform various machining including turning of a workpiece in a turning center through high-speed rotation.

In general, a machine tool refers to a machine used for the purpose of processing a metal/non-metal workpiece into a desired shape and size using an appropriate tool by various cutting or non-cutting methods.

Various types of machine tools, including turning centers, vertical/horizontal machining centers, door machining centers, Swiss turns, electric discharge machines, horizontal NC boring machines, and CNC lathes, are widely used in various industrial sites for their respective purposes.

In general, various types of machine tools currently used have an operation panel to which numerical control (NC) or computerized numerical control (CNC) technology is applied. Such an operation panel is provided with various function switches or buttons and a monitor.

In addition, the machine tool includes a table on which a workpiece material is seated and transferred for processing the workpiece, a pallet for preparing the workpiece before processing, a spindle that rotates when a tool or workpiece is combined, a tailstock for supporting the workpiece, etc. during processing, a vibration isolator etc. are provided.

In general, in a machine tool, a table, a tool rest, a main shaft, a tailstock, a vibration isolator, etc. are provided with a conveying unit which conveys along a conveying axis in order to perform various processing.

In addition, in general, a machine tool uses a plurality of tools for various processing, and a tool magazine or a turret is used as a tool storage place for storing and storing a plurality of tools.

Such a machine tool uses a plurality of tools for various processing, and a tool magazine is used in the form of a tool storage place storing a plurality of tools.

In addition, in general, a machine tool is provided with an automatic tool changer (ATC, Automatic Tool Changer) for withdrawing a specific tool from the tool magazine or receiving it again according to the command of the numerical control unit in order to improve the productivity of the machine tool.

In addition, in general, a machine tool is provided with an automatic pallet changer (APC, Automatic Palette Changer) in order to minimize the non-working time. The automatic pallet changer (APC) automatically exchanges pallets between the workpiece machining area and the workpiece installation area. Pallets may be loaded with workpieces.

In general, turning is used to process a product in the shape of a rotating body while rotating a material and inserting a cutting tool into the material. In addition, the products processed in the turning are diversified in shape, in particular, high precision is required, and it is required to shorten the processing time. As an example of such a product, there is a material having an elongated shape, and when the material is turned, the length of the product is cut relatively short, so that one original material can be processed into several products. As described above, since a thin and elongated material may generate vibration during turning, stabilization of the material is required.

In general, machine tools can be divided into turning centers and machining centers. Machining centers can machine workpieces using rotating tools. On the other hand, a turning center can machine a rotating workpiece using a tool.

Among machine tools, a turning center holds a cylindrical workpiece on a turntable, combines a bite for cutting the workpiece with the main shaft, rotates the turntable to rotate the workpiece, and moves the bite to obtain the desired cylindrical processing result. It is a device to obtain That is, such a turning center has a function of cutting a cylindrical workpiece, and is an exclusive device for performing a turning process to produce a shape of a machining result, and is often supplied as a device of a vertical lathe.

As such, in general, turning centers are primarily capable of turning the workpiece. In recent years, a turning center may be equipped with a structure capable of milling in addition to turning a workpiece. Such a turning center may include a milling machine mounted on a tool rest.

The milling machine may include a drive shaft and a spindle for milling operations. The rotational motion of the spindle can be supported by tapered roller bearings. The spindle may be connected to the drive shaft via a bevel gear.

However, in the case of a conventional machine tool and its control method, as described above, in the case of a turning center, when a workpiece, not a tool, rotates at a high speed, unlike a machining center, when rotating at a high speed, noise and vibration are increased to perform high-speed turning that requires high-speed rotation. However, the compatibility of the equipment deteriorated, and the manufacturing cost increased as a separate equipment was installed for high-speed turning, or a chuck or clamping device for high-speed rotation had to be developed and installed separately.

In addition, the conventional machine tool and its control method have problems in that the machine tool cannot be miniaturized, space utilization is reduced, and maintenance cost is increased as a lot of additional equipment is additionally installed and the structure is complicated.

Furthermore, in the conventional machine tool and its control method, vibration or noise is generated during high-speed rotation due to the size and weight of the workpiece itself despite the installation of an expensive chuck or clamping device, which causes inconvenience to the operator and lowers processing precision. However, there was a problem in that the processing cost increased due to the occurrence of torque loss.

In addition, the conventional machine tool and its control method reduce productivity by increasing the non-working time by moving the workpiece to a separate equipment for turning that requires high-speed rotation, thereby reducing the productivity and lowering the safety and reliability of the machine tool. There was a problem being

Korean Patent Publication No. 10-2005-0004532 Korean Patent Registration Publication No. 10-0795470 Korean Patent Laid-Open Publication No. 10-2009-0045036 Korean Patent Publication No. 10-2011-0038958 Korean Patent Publication No. 10-2018-0100968

The present invention is to solve the above problems, and an object of the present invention is to automatically distribute the rotational speed of the main spindle and the subspindle according to the desired rotational speed target value by the operator, and automatically achieve the best state according to the state of the equipment. By rotating the main spindle and sub-spindle in opposite directions according to the number of rotations distributed by Machine tools and machine tool control that can reduce the manufacturing cost of equipment, reduce the maintenance cost by minimizing the introduction of separate equipment, maximize the space utilization by promoting the miniaturization of the equipment, and maximize the safety and reliability of the machine tool to provide a way

In addition, another object of the present invention is to automatically distribute the number of revolutions of the main spindle and the sub-spindle according to the target value of the number of revolutions desired by the operator, and the main spindle and the main spindle by the number of revolutions automatically distributed in the best state according to the state of the equipment By rotating the sub-spindles in opposite directions to each other, vibration and noise are minimized, and high-speed rotation is performed in the turning center without torque loss, thereby improving machining precision, increasing tool life by minimizing vibration and torque damage, and equipping the workpiece. As it is possible to perform turning that requires high-speed rotation without replacement, it is possible to maximize productivity by reducing non-working time and to reduce machining costs to provide machine tools and control methods for machine tools that can improve worker and consumer satisfaction. will be.

In order to achieve the object of the present invention, a machine tool according to the present invention includes a main spindle for clamping a workpiece or a tool; a main spindle driving unit for rotationally driving the main spindle; a sub-spindle for clamping a workpiece or a tool opposite to the main spindle; a sub-spindle driving unit for rotationally driving the sub-spindle; and a control unit controlling rotations of the main spindle and the sub-spindle, wherein the control unit distributes the number of rotations of the main spindle and the sub-spindle according to a target value, and distributes the rotation number of the main spindle and the sub-spindle according to the divided rotation speed. By rotating the sub-spindles in opposite directions to each other, rotation according to the target value can be performed by relative speed.

In addition, in another preferred embodiment of the machine tool according to the present invention, the control unit of the machine tool distributes the number of rotations of the main spindle and the sub-spindle and reverse rotation of the main spindle and the sub-spindle with respect to the target value. a memory unit for storing information to be executed; an input unit for inputting the target value, the manual distribution ratio, or information stored in the memory unit; a calculation unit for calculating a rotation speed distribution ratio of the main spindle and the sub-spindle based on the target value and information stored in the memory unit; and a distribution unit that determines a rotation direction of the main spindle and the sub-spindle and rotates the main spindle and the sub-spindle in opposite directions according to the result of the operation unit to perform high-speed rotation corresponding to the target value. can

In addition, in another preferred embodiment of the machine tool according to the present invention, the memory unit of the control unit of the machine tool is the highest and lowest rotational speed of the main spindle and the sub-spindle, the friction coefficient of the main spindle and the sub-spindle, a basic data storage unit for storing the fixed rotation speed value of the main spindle and data on the machining program; an input data storage unit for storing the target value or manual distribution ratio input through the input unit; a workpiece data storage unit for storing workpiece data on the type, diameter, weight, and length of the workpiece; a main spindle data storage unit for storing data on output, rotational speed, and torque according to the operating state of the main spindle; a sub-spindle data storage unit for storing data on output, rotational speed, and torque according to the operating state of the sub-spindle; and a load data storage unit configured to store load data and friction coefficient data of the main spindle and the sub-spindle.

In addition, in another preferred embodiment of the machine tool according to the present invention, the operation unit of the control unit of the machine tool is based on the data stored in the storage unit, the operation state of the main spindle and the sub-spindle, the machining diameter of the workpiece, and the target value Confirmation unit to confirm; and a load calculator configured to calculate the loads of the main spindle and the sub-spindle based on the data stored in the storage unit and a result of the confirmation unit. and a distribution ratio calculator configured to calculate a distribution ratio of the rotation speed with respect to the target value of the main spindle and the sub-spindle based on the data stored in the storage and the load value calculated by the load calculator.

In addition, in another preferred embodiment of the machine tool according to the present invention, the distribution unit of the control unit of the machine tool by the data stored in the storage unit, the confirmation result of the confirmation unit, and the rotation speed distribution ratio calculated through the calculation unit. a determination unit for determining the rotational direction of the main spindle and the sub-spindle and the feeding direction of the tool; and a command unit for transferring the tool according to the determination result of the determination unit and the result of the operation unit, and outputting a distribution signal for rotating the main spindle and the sub-spindle in opposite directions according to the calculated rotation speed distribution ratio; may include

In addition, in another preferred embodiment of the machine tool according to the present invention, the control unit of the machine tool rotates the main spindle and the sub-spindle in opposite directions to each other through the distribution unit to perform rotation with respect to the target value by a relative speed. to store feedback data according to the operation of the main spindle driver and the sub-spindle driver in real time, and compare the feedback data with the signal transmitted from the distribution unit to analyze whether the main spindle and the sub-spindle operate normally. It may further include an analysis unit.

In addition, in another preferred embodiment of the machine tool according to the present invention, the control unit of the machine tool is a selection unit for selecting the rotation speed distribution method of the main spindle and the sub-spindle; and a display unit for displaying results of the input unit, the memory unit, the calculation unit, the distribution unit, the analysis unit, and the selection unit.

In addition, in another preferred embodiment of the machine tool according to the present invention, the machine tool includes a spindle moving unit for moving the main spindle or the sub-spindle; and a tool transfer unit for transferring the tool clamped to the main spindle or the sub-spindle.

In addition, in another preferred embodiment of the machine tool according to the present invention, the tool transport unit of the machine tool uses the tool in a cylinder method or a linear motor method or a cam drive method to process a workpiece clamped to the main spindle or the sub spindle. can be moved in the height direction.

In order to achieve another object of the present invention, a method for controlling a machine tool according to the present invention includes the steps of: storing data for distributing the number of revolutions of a main spindle and a sub-spindle according to a target value; receiving data on the target value; selecting a rotation speed distribution method between the main spindle and the sub-spindle; checking the operating states of the main spindle and the sub-spindle, the machining diameter of the workpiece, and the target value; calculating loads of the main spindle and the sub-spindle; calculating a rotation speed distribution ratio of the main spindle and the sub spindle with respect to the target value; determining the rotational direction of the main spindle and the sub-spindle and the feeding direction of the tool based on the calculated rotational speed distribution ratio; and transferring the tool according to the determination result and outputting a distribution signal for rotating the main spindle and the sub-spindle in opposite directions according to the calculated rotation speed distribution ratio.

In addition, in another preferred embodiment of the method for controlling a machine tool according to the present invention, the method for controlling the machine tool rotates the main spindle and the sub-spindle in opposite directions to each other after outputting the distribution signal by relative speed. When the rotation is performed with respect to the target value, feedback data according to the operation of the main spindle driver and the sub-spindle driver is stored in real time, and the feedback data and the distribution signal are compared to analyze whether the main spindle and the sub-spindle operate normally. It may further include;

In addition, in another preferred embodiment of the method for controlling a machine tool according to the present invention, the step of selecting the rotation speed distribution method of the main spindle and the sub-spindle of the machine tool control method is a manual distribution method, maintaining a fixed value of the main spindle method, and an automatic distribution method.

In another preferred embodiment of the method for controlling a machine tool according to the present invention, when selecting the automatic distribution method in the step of selecting the rotation speed distribution method of the main spindle and the sub-spindle of the machine tool control method The rotation speed distribution ratio is automatically calculated and, when the manual distribution method is selected, the main spindle and the main spindle and the A rotation speed distribution ratio of the sub-spindles may be determined.

Further, in another preferred embodiment of the method for controlling a machine tool according to the present invention, in the step of selecting the rotation speed distribution method of the main spindle and the sub-spindle of the control method of the machine tool, the main spindle fixed value maintenance method is selected In this case, the rotation speed distribution ratio of the sub-spindles may be determined by subtracting the fixed main spindle rotation speed value from the target value based on the pre-stored fixed main spindle rotation speed value.

The machine tool and the machine tool control method according to the present invention automatically distribute the rotation speed of the main spindle and the sub-spindle according to the target rotation speed desired by the operator, and automatically distribute the rotation speed to the best state according to the state of the equipment. By rotating the main spindle and sub-spindle in opposite directions to perform high-speed rotation in the turning center, various machining including turning of the workpiece is performed in the turning center to increase the utility and compatibility of the turning center, and equipment capable of high-speed turning It has the effect of reducing the manufacturing cost of the product and minimizing the introduction of separate equipment to reduce the maintenance cost.

In addition, the machine tool and the control method of the machine tool according to the present invention automatically distribute the rotation speed of the main spindle and the sub spindle according to the target rotation speed desired by the operator, and the rotation automatically distributed in the best state according to the state of the equipment As the main spindle and sub-spindle are rotated in opposite directions by number to perform high-speed rotation in the turning center, various machining including turning of the workpiece is performed in the turning center to miniaturize the machine tool and maximize space utilization. It has the effect of maximizing the safety and reliability of the machine tool.

Furthermore, the machine tool and the machine tool control method according to the present invention automatically distribute the rotation speed of the main spindle and the sub-spindle according to the desired rotation speed target value by the operator, and the rotation automatically distributed in the best state according to the state of the equipment By manually rotating the main spindle and sub-spindle in opposite directions to each other, vibration generation and noise are minimized, and high-speed rotation is performed in the turning center without torque loss, thereby improving machining precision, and minimizing vibration and torque damage to shorten tool life. has the effect of increasing it.

In addition, the machine tool and the control method of the machine tool according to the present invention maximize productivity by reducing non-working time as turning processing that requires high-speed rotation is performed without replacing the workpiece with other equipment other than the turning center in the turning center, and processing cost This has the effect of improving the satisfaction of workers and consumers by reducing the cost of workers and preventing worker safety accidents in advance.

1 shows a conceptual diagram of a machine tool according to the present invention.
Figure 2 shows the configuration of the control unit of the machine tool according to the present invention.
Figure 3 shows a perspective view according to an embodiment of the machine tool according to the present invention.
4 and 5 are perspective views for explaining the operating state of the tool transfer unit according to an embodiment of the machine tool according to the present invention.
6 shows a graph of the number of revolutions of the main spindle of the machine tool according to the present invention - an output diagram.
7 shows a graph of the number of revolutions of the sub-spindle of the machine tool according to the present invention - an output diagram.
8 is a flowchart showing a method for controlling a machine tool according to the present invention.

Hereinafter, with reference to the drawings of the machine tool and the control method of the machine tool according to an embodiment of the present invention will be described in detail. The embodiments introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. And, in the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numbers refer to like elements throughout.

Advantages and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of description.

The terminology used herein is for the purpose of describing the embodiments, and thus is not intended to limit the present invention. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprise” and/or “comprising” refers to the presence of one or more other components, steps, operations, and/or elements mentioned. or addition is not excluded.

Figure 1 shows a conceptual diagram of a machine tool according to the present invention, Figure 2 shows a configuration diagram of a control unit of the machine tool according to the present invention. Figure 3 shows a perspective view according to an embodiment of the machine tool according to the present invention, Figures 4 and 5 shows a perspective view for explaining the operating state of an embodiment tool transfer unit of the machine tool according to the present invention. 6 shows a graph of the number of rotations of the main spindle of the machine tool according to the present invention-output diagram, and FIG. 7 shows a graph of the rotation number-output diagram of the sub-spindle of the machine tool according to the present invention. 8 is a flowchart showing a method for controlling a machine tool according to the present invention.

Definitions of terms used below are as follows. "X-axis direction" means the height direction in the same member, that is, the X-axis direction in FIGS. 3 to 5, and "Z-axis direction" is orthogonal to the X-axis direction and horizontal in the same member, that is, in FIGS. 5 means the Z-axis direction. In addition, upper (upper) means an upward direction in "height direction", that is, a direction toward the upper side of the X axis in FIGS. 3 to 5, and downward (lower) means a downward direction in "height direction", that is, FIGS. 5 means the direction toward the bottom of the X-axis. In addition, "one side (one end)" and "the other end (other end)" mean either the tip of either side in the horizontal direction or the height direction in the same member.

A machine tool 1 according to the present invention will be described with reference to FIGS. 1 to 7 . 1 to 5 , the machine tool 1 according to the present invention includes a main spindle 100 , a main spindle driving unit 200 , a sub spindle 300 , a sub spindle driving unit 400 , and a control unit 700 . ) is included. In addition, as shown in FIGS. 1 to 5 , the machine tool 1 according to the present invention may further include a spindle moving unit 500 and/or a tool transfer unit 600 .

The main spindle 100 is movable by a spindle moving part 500 to be described later on the bed 10 or is fixedly installed on the bed 10 to clamp the workpiece 30 or the tool 40 . In addition, the main spindle 100 may be moved in the horizontal Z-axis direction by the spindle moving unit 500 on the bed. Preferably, when the machine tool is a turning center, the main spindle clamps the workpiece, and in the case of the machining center, the main spindle clamps the tool.

The main spindle driving unit 200 rotationally drives the main spindle 100 at a rotational speed (RPM) according to the control signal according to a control signal of the numerical control unit or PLC or the control unit 700 . The main spindle driving unit 200 may be formed of a servo motor.

The sub spindle 300 is movable by a spindle moving part 500 to be described later on the bed 10 or is fixedly installed on the bed 10 so as to be opposite to the main spindle 100 with the workpiece 30 or the tool 40. clamp the In addition, the sub-spindle 300 may be moved in the horizontal Z-axis direction by the spindle moving unit 500 on the bed. Specifically, when the machine tool is a turning center, as the main spindle clamps the workpiece, the sub-spindle clamps the tool opposite to the main spindle. Clamp the workpiece against the spindle.

The sub-spindle driving unit 400 rotates and drives the sub-spindle 300 at a rotational speed (RPM) according to the control signal according to a control signal of the numerical control unit or PLC or the control unit 700 . This sub-spindle driving unit 400 may be formed of a servo motor.

The controller 700 controls the rotation of the main spindle 100 and the sub-spindle 300 . That is, the control unit 700 determines the number of rotations and rotation directions of the main spindle and the sub-spindle according to the target value, which is the target rotation speed input by the operator or the user through the input unit 710 to be described later, and determines the rotation speed and the distributed rotation speed. Accordingly, turning can be performed by rotating the main spindle and the sub-spindle in opposite directions to perform high-speed rotation corresponding to the target value by the relative speed. That is, a relatively high-speed rotation such as 10,000 RPM is rotated by the main spindle 5,000 RPM and the sub-spindle 5,000 RPM. Turning, such as the outer diameter of the required workpiece, is performed without special equipment or changes, as well as reducing vibration and noise to improve machining precision, increase productivity, reduce manufacturing and maintenance costs of machine tools, and By minimizing processing costs, customer satisfaction can be improved.

The spindle moving unit 500 moves the main spindle 100 or the sub-spindle 300 in a horizontal direction, a vertical direction, or a height direction on the bed. Specifically, the spindle moving unit 500 may move only the main spindle 100 on the bed or only the sub-spindle 300 on the bed. In addition, the spindle moving unit 500 may relatively move the main spindle and the sub-spindle on the bed by a signal from a numerical control unit, PLC, or control unit in order to perform various processing as needed. Specifically, as shown in FIGS. 3 to 5 , the spindle moving unit 500 may move the sub-spindle 300 in the Z-axis direction. A variety of moving devices such as a servo motor, a ball screw, an LM guide, a linear block or a chain type may be applied to the spindle moving unit 500 .

The tool transfer unit 600 transfers the tool clamped to the main spindle or the sub-spindle.

In addition, as shown in FIGS. 4 to 5 , the tool transfer unit 600 moves the tool in the height direction through a cylinder method, a linear motor method, or a cam drive method to process a workpiece clamped to the main spindle or sub spindle. can do it That is, the tool transfer unit 600 is installed on the main spindle or sub-spindle and moves the tool clamped to the main spindle or sub-spindle in the X-axis direction, which is the height direction, so that the workpiece having various shapes and diameters according to the size and type of the workpiece is formed. Outer and inner diameters can be turned.

In one embodiment, when the tool transfer unit 600 is a cylinder type, a numerical control unit, PLC or control unit can freely adjust the forward and backward distances of the cylinder with a scale function of a hydraulic cylinder or a pneumatic cylinder. By moving the cylinder forward or backward according to the control signal of .

In another embodiment, when the tool transfer unit 600 is a linear motor type, a linear motor is installed inside the body of the sub spindle or the main spindle to operate the linear motor by a control signal from the numerical control unit, PLC, or control unit. By operating the tool to move the tool in the height direction, the length of the tip of the tool is adjusted while the tool is clamped on the main spindle or sub-spindle.

In another embodiment, when the tool transfer unit 600 is a cam type, it includes a cam box that rotates a cam and a motor that drives the cam, and a cam driving motor by a control signal from a numerical control unit, PLC, or control unit. is operated and the tool is clamped to the main spindle or sub spindle by cam rotation according to the cam diagram, and the length of the tip of the tool is adjusted to process the outer and inner diameters of workpieces with various diameters through high-speed turning.

As such, the machine tool according to the present invention automatically distributes the number of revolutions of the main spindle and the sub-spindle according to the target value of the number of revolutions desired by the operator, and the main spindle and As the turning center rotates at high speed by rotating the sub-spindles in opposite directions, the turning center performs various machining including turning of the workpiece to increase the utility and compatibility of the turning center and simplify the structure of equipment capable of high-speed turning. Thus, it is possible to reduce the size of the machine tool and maximize the space utilization to reduce the installation time and cost, and reduce the maintenance cost.

In addition, although not shown in the drawings, the machine tool according to the present invention includes a numerical control unit and a PLC.

The numerical control unit includes NC (numerical control, NC) or CNC (computerized numerical control), and various numerical control programs are built-in. That is, the numerical control unit includes a main spindle driving unit, a sub spindle driving unit, a main spindle, a sub spindle, a spindle moving unit, and a servo motor driving program and a tool driving program of the tool transfer unit. It automatically loads and works. In addition, the numerical control unit communicates with the PLC and the control unit 700 by a predetermined protocol.

In addition, the numerical control unit communicates with the servomotor used for driving the control unit, PLC, main spindle driving unit and sub-spindle driving unit, spindle moving unit, and tool transfer unit, and receives feedback information from the servomotor.

In addition, although not shown in the drawings, according to a preferred embodiment of the present invention, the numerical control unit includes a main operation unit, and the main operation unit includes a screen display program and a data input program according to the screen display selection, and the screen According to the output of the display program, a software switch is displayed on the display screen, and the ON/OFF of the software switch is recognized to give an input/output command for machine operation.

In addition, although not necessarily limited thereto, the main operation unit includes a monitor that is installed on the housing, case, or one side of the machine tool to display various function switches or buttons and various information.

PLC (Programmable Logic Controller) performs communication according to a predetermined protocol with the main spindle, sub spindle, main spindle driving unit, sub spindle driving unit, spindle moving unit, tool transfer unit, numerical control unit, and control unit, etc. performs the function of That is, the PLC drives the main spindle, the sub-spindle, the main spindle driving unit, the sub-spindle driving unit, the spindle moving unit, and the tool transfer unit according to the numerical control unit and the numerical control program of the control unit.

Therefore, the machine tool according to the present invention distributes the number of revolutions corresponding to the target value to the main spindle and the sub-spindle according to the number of revolutions distribution ratio, rotates them in opposite directions, and transfers the tool to process workpieces having various sizes and diameters at high speed. It can prevent malfunction when performing various machining including turning that requires rotation, prevent damage or breakage of tools or other equipment due to malfunction, and improve user convenience.

1 to 2, the control unit 700 of the machine tool 1 according to the present invention includes an input unit 710, a memory unit 720, an operation unit 730, a distribution unit 740, an analysis unit ( 750 , a selection unit 760 , and/or a display unit 770 .

The input unit 710 inputs a target value, a manual distribution ratio, or information stored in the memory unit. That is, a user or operator may input a target value corresponding to a desired rotational speed in the form of RPM or peripheral speed through the input unit. Also, as will be described later, when the manual distribution method is selected in the selection unit, the user may directly input the number of rotations distributed between the main spindle and the sub-spindle through the input unit. Such an input unit may be formed of various types of equipment having a Human-Machine Interface (HMI), that is, a user interface-based program.

The memory unit 720 stores information for distributing the number of rotations of the main spindle and sub-spindle and performing reverse rotation of the main spindle and sub-spindle with respect to a target value. The memory unit 720 may be various storage devices such as ROM, RAM, EPROM, flash drive, hard drive, etc., and may be web storage that performs a storage function of the memory unit on the Internet. The operation of allocating the number of rotations of the main spindle and sub-spindle in the memory unit and storing information for performing reverse rotation of the main spindle and sub-spindle with respect to a target value can be performed by an operator through the numerical control unit or the main operation unit, It can also be saved in the form of a program through PLC or input unit.

The calculating unit 730 calculates the rotation speed distribution ratio of the main spindle and the sub-spindle based on the target value input through the input unit 710 and the information stored in the memory unit 720 .

The distribution unit 740 determines the rotation directions of the main spindle and the sub-spindle and rotates the main spindle and the sub-spindle in opposite directions according to the result of the operation unit to perform high-speed rotation corresponding to a target value.

The analysis unit 750 rotates the main spindle and the sub-spindle in opposite directions to each other through the distribution unit 740 to perform high-speed rotation with respect to the target value by the relative speed, feedback data according to the operation of the main spindle driver and the sub-spindle driver is stored in real time, and the normal operation of the main spindle and sub-spindle is analyzed by comparing the feedback data and the rotation speed distribution rate and rotation direction, tool feed or spindle movement signal transmitted from the distribution unit. Specifically, as a result of the analysis of the analysis unit 750, the main spindle and sub-spindle normally rotate in the direction by the signal according to the rotation speed distribution ratio, and when the tool is moved, a normal signal is displayed, and the signal transmitted from the distribution unit is displayed. An alarm is generated when the main spindle and sub-spindle do not rotate according to the rotation speed distribution ratio, the rotation direction is different, or the tool feed amount is different. Such an alarm may be generated in the form of a warning sound or a warning light. Accordingly, the operator can immediately check whether there is an abnormality in the equipment and take action to prevent damage to tools or other equipment and prevent wastage of resources by preventing waste of workpieces.

The selection unit 760 selects a rotation speed distribution method between the main spindle and the sub-spindle. Specifically, the selector 760 may select one of the manual distribution method, the main spindle fixed value maintenance method, and the automatic distribution method for the number of rotations of the main spindle and the sub-spindle through the manipulation of a button by the operator.

If the operator selects the manual distribution method, the rotation speed distribution ratio of the main spindle and the sub-spindle with respect to the target value is input through the input unit, and the main spindle and the sub-spindle are rotationally driven in the opposite direction with the input value. For example, if the target value is 10,000RPM, the operator inputs 10,000RPM as the target value and 5,000RPM and 5,000RPM to the main spindle and 5,000RPM to the subspindle, or if the rotation speed distribution ratio is 1:1, the main spindle and sub spindle Each spindle rotates in opposite directions at 5,000 RPM.

Similarly, when the operator selects the main spindle fixed value maintenance method, the main spindle rotation speed is rotated by the fixed main spindle rotation speed value stored in the basic data storage unit through the input unit, and the main spindle rotation speed fixed value is set at the target value. Subspindle rotates in the opposite direction to the main spindle by the number of revolutions minus . For example, when the target value is 8,000RPM and the fixed rotation speed of the main spindle is 3,000RPM, the main spindle rotates at 3,000RPM and the sub-spindle rotates at 5,000RPM. This is because if the rotational speed (RPM) of the main spindle and sub-spindle is changed frequently, the machining roughness of the workpiece may be deteriorated as the acceleration/deceleration of the main spindle and sub-spindle is changed, and thus machining precision may be lowered. In this way, in order to maintain machining precision and improve surface roughness in high-speed turning, which requires very precise surface roughness, such as high-precision machining, the operator selects the main spindle fixed value maintenance method through the selection unit and It is possible to easily secure machining precision while performing turning.

Similarly, when the operator selects the automatic main spindle distribution method, the machining program, work data storage, main spindle data storage, and sub-spindle data are stored in the basic data storage unit by the target value stored in the input data storage unit through the input unit. The load calculation unit calculates the load based on the data stored in the sub and load data storage units, and the distribution rate calculation unit automatically calculates the optimal rotation speed distribution ratio of the main spindle and sub spindle. That is, the rotation direction and rotation speed distribution ratio of the main spindle and sub-spindle are automatically calculated according to the target value, workpiece type, size, and diameter to be machined. , and the tool feeds and automatically performs turning according to high-speed rotation.

The display unit 770 may display the results of the input unit 710 , the memory unit 720 , the calculation unit 730 , the distribution unit 740 , the analysis unit 750 , and the selection unit 760 .

The display unit 770 includes a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), and a flexible display (Flexible Display). display), a three-dimensional display (3D display), and an electronic ink display (e-ink display) may include at least one.

In addition, although not necessarily limited thereto, the display unit 770 receives various workpiece information or processing program information or a user's operation command for reverse rotation by the rotation part distribution ratio of the main spindle and the sub spindle, and receives the input operation command or rotation It may be formed in the form of a touch screen capable of outputting a number distribution ratio or confirmation information to a numerical control unit, PLC, or control unit.

In addition, the display unit 770 includes a screen display program and a data input program according to screen display selection, and displays a software switch on the display screen according to the output of the screen display program, and turns ON/OFF of the software switch. ) and executes the function of issuing input/output commands for machine operation.

In addition, although not necessarily limited thereto, the display unit may be installed on the housing, case, or one side of the machine tool to display various function switches or buttons and various information.

1 and 2, the memory unit 720 of the control unit 700 of the machine tool 1 according to the present invention includes a basic data storage unit 721, an input data storage unit 722, and a work data storage unit. It includes a unit 723 , a main spindle data storage unit 724 , a sub-spindle data storage unit 725 , and a load data storage unit 726 .

The basic data storage unit 721 stores data on the highest and lowest rotational speeds of the main spindle and the sub-spindle, the friction coefficient of the main spindle and the sub-spindle, a fixed rotational speed of the main spindle, and a machining program.

The input data storage unit 722 stores the target value or the manual distribution rate input through the input unit 710 .

The work data storage unit 723 stores work data for the type, diameter, weight, and length of the work piece.

As shown in FIG. 6 , the main spindle data storage unit 724 stores data on the output, the number of revolutions, and the torque according to the operating state of the main spindle according to the rotation speed-output diagram of the main spindle.

As shown in FIG. 7 , the sub-spindle data storage unit 725 stores data on the output, the number of rotations, and the torque according to the operating state of the sub-spindle according to the rotation speed-output diagram of the sub-spindle.

The load data storage unit 726 stores load data and friction coefficient data of the main spindle and sub spindle.

1 and 2, the operation unit 730 of the control unit 700 of the machine tool 1 according to the present invention is a confirmation unit 731, a load calculation unit 732, and a distribution ratio calculation unit 733. ) is included.

The confirmation unit 731 includes basic data such as a machining program stored in the basic data storage unit of the storage unit, target value data stored in the input data storage unit, work information for the work data storage unit, and a main spindle data storage unit and a sub spindle storage unit. The operation status of the main spindle and sub-spindle and the machining diameter and target value of the workpiece are checked by the main spindle information and sub-spindle information stored in the .

The load calculation unit 732 includes the output, rotation speed and torque according to the operating states of the main spindle and sub-spindle stored in the main spindle data storage unit and the sub-spindle data storage unit of the storage unit, and load data and friction stored in the load data storage unit. The load of the main spindle and sub-spindle is calculated based on the counting and verification results of the check unit.

The distribution ratio calculator 733 is configured to calculate output, rotation speed and torque according to the operating state of the main spindle and sub-spindle stored in the main spindle data storage unit and the sub-spindle data storage unit of the storage unit, and the main spindle and sub spindle calculated by the load calculator. Based on the load value of the spindle, the rotation speed distribution ratio for the target value of the main spindle and sub-spindle is calculated.

1 and 2 , the distribution unit 740 of the control unit 700 of the machine tool 1 according to the present invention includes a determination unit 741 and a command unit 742 .

The determination unit 741 is the data stored in the storage unit, such as workpiece information, basic data such as a machining program, main spindle information, sub spindle information, load data and the confirmation result of the confirmation unit, and the rotation calculated through the rotation speed distribution ratio calculation unit of the calculation unit The rotation direction of the main spindle and sub-spindle and the feeding direction of the tool are determined by the number distribution ratio.

The command unit 742 transfers the tool upward or downward in the height direction according to the determination result of the determination unit and the result of the distribution rate calculation unit of the calculation unit, and determines the rotation direction of the main spindle and the sub spindle according to the calculated rotation speed distribution rate. outputs a distribution signal for rotating in opposite directions to each other.

As such, the machine tool according to the present invention automatically distributes the number of revolutions of the main spindle and the sub-spindle according to the target value of the number of revolutions desired by the operator, and the main spindle and By rotating the sub-spindles in opposite directions to each other, it is possible to improve machining precision by performing high-speed rotation at the turning center without torque loss while minimizing vibration and noise. As the center performs turning that requires high-speed rotation without replacing the workpiece with other equipment other than the turning center, it maximizes productivity by reducing non-working time, reduces machining costs, and prevents safety accidents for workers and consumers in advance. can improve the satisfaction of

The operating principle of the machine tool and its control method according to the present invention will be described with reference to FIGS. 3 to 7 .

Based on the rotation speed-output diagram through the input unit, information on the rotation speed (RPM) and output (KW) according to the operating state of the main spindle and sub spindle is provided in the form of a lookup table in the main spindle data storage unit and the sub spindle data storage unit save as

For example, the lookup table for the main spindle and sub spindle is as follows.

In addition, loads and friction coefficients of the main spindle and sub spindle are stored in the load data storage unit through the input unit. The load data stored in the load data storage unit, the basic data stored in the basic data storage unit, the main spindle information stored in the main spindle data storage unit, and the sub-spindle information stored in the sub-spindle data storage unit are used in the load calculator to calculate the main spindle and the sub-spindle. Calculate the inertia of

When calculating the load, the friction coefficient (dw/dt) may be determined in the form of a lookup table according to each type or type of equipment. For example, when the friction coefficient (dw/dt) is set to 1, the load data information may be input in the form of the following lookup table.

In addition, data on the type, weight, diameter, and length of the work is stored in the work data storage unit through the input unit. The basic machining program, the minimum and maximum rotation speeds of the main spindle and sub spindle, the fixed rotation speed of the main spindle, and the minimum and maximum peripheral speeds are stored in the data storage unit through the input unit. Alternatively, it may be input in the form of a lookup table through PLC or HMI.

The operator or user selects the rotation speed distribution method of the main spindle and the sub-spindle through the selection unit.

For example, if the operator selects the manual distribution method, the rotation speed distribution ratio of the main spindle and the sub-spindle for the target value is input through the input unit, and the main spindle and the sub-spindle rotate in the opposite direction with the input value. . Specifically, the operator arbitrarily inputs the rotation speed or rotation speed distribution ratio of the main spindle and sub spindle based on the rotation speed-output diagram of the main spindle and sub spindle. For example, if the target value is 10,000RPM, the operator inputs 10,000RPM as the target value and 5,000RPM and 5,000RPM to the main spindle and 5,000RPM to the subspindle, or if the rotation speed distribution ratio is 1:1, the main spindle and sub spindle Each spindle rotates in opposite directions at 5,000 RPM.

For example, when the operator selects the main spindle fixed value maintenance method, the main spindle rotation speed is rotated by the main spindle rotation speed fixed value stored in the basic data storage unit through the input unit, and the main spindle rotation speed is set at the target value. The sub-spindle rotates in the opposite direction to the main spindle at the number of revolutions minus the fixed value. In addition, the operator can change or modify the fixed main spindle rotation speed by the main spindle rotation speed-output diagram. For example, when the target value is 8,000RPM and the fixed rotation speed of the main spindle is 3,000RPM, the main spindle rotates at 3,000RPM and the sub-spindle rotates at 5,000RPM. This is because if the rotational speed (RPM) of the main spindle and sub-spindle is changed frequently, the machining roughness of the workpiece may be deteriorated as the acceleration/deceleration of the main spindle and sub-spindle is changed, and thus machining precision may be lowered. In this way, in order to maintain machining precision and improve surface roughness in high-speed turning, which requires very precise surface roughness, such as high-precision machining, the operator selects the main spindle fixed value maintenance method through the selection unit and It is possible to easily secure machining precision while performing turning.

For example, if the operator selects the automatic main spindle distribution method, the machining program stored in the basic data storage unit, the workpiece data storage unit, the main spindle data storage unit, and the sub spindle according to the target value stored in the input data storage unit through the input unit. The load calculation unit calculates the load based on the data stored in the data storage unit and the load data storage unit, and the distribution rate calculation unit automatically calculates the optimal rotational speed distribution ratio of the main spindle and sub-spindle. That is, the rotation direction and rotation speed distribution ratio of the main spindle and sub-spindle are automatically calculated according to the target value, workpiece type, size, and diameter to be machined. , and the tool feeds and automatically performs turning according to high-speed rotation.

For example, if the automatic distribution method is selected and the data as in the above table is input, the number of revolutions (RPM), output (KW), and torque of the main spindle and sub-spindle is the number of revolutions of the main spindle and sub-spindle. - Based on the output diagram, the rotation speed distribution ratio of the following main spindles and sub-spindles can be determined.

The tool feed direction is determined according to the rotation direction and machining diameter of the main spindle and sub-spindle by the determined rotation speed distribution ratio of the main spindle and sub-spindle, the target value, and the workpiece information, and the main spindle and sub-spindle information.

Thereafter, the command unit transfers the tool to the machining position through the tool transfer unit, and according to the target value, the rotational direction determined by the main spindle and the sub-spindle determination unit by the rotation speed distribution rate calculated by the distribution rate calculation unit according to the target value. This is output.

Thereafter, the numerical control unit or PLC reads the corresponding distribution output signal and operates the main spindle driving unit, the sub spindle driving unit, the spindle moving unit and the tool feeding unit to perform turning through high-speed rotation.

In this way, the machine tool and the machine tool according to the present invention automatically distribute the number of revolutions of the main spindle and the sub-spindle according to the target value of the number of revolutions desired by the operator, and the number of revolutions automatically distributed in the best state according to the state of the equipment. As the main spindle and sub-spindle are rotated in opposite directions to perform high-speed rotation in the turning center, various machining including turning of the workpiece is performed in the turning center to increase the utility and compatibility of the turning center and increase the use of equipment capable of high-speed turning. Reduce manufacturing costs, reduce maintenance costs by minimizing the introduction of separate equipment, and maximize space utilization by miniaturizing machine tools by performing various machining including turning of workpieces in the turning center reliability can be improved.

A method of controlling a machine tool according to the present invention will be described with reference to FIG. 8 . As shown in Figure 8, the control method of the machine tool according to the present invention is data storage step (S1), target value receiving step (S2), rotation speed distribution method selection step (S3), confirmation step (S4), load calculation It includes a step (S5), a calculation step (S6) of the rotation speed distribution ratio, a determination step (S7), a command step (S8) of outputting a distribution signal, and an analysis step (S9). The overall operation principle control method and equipment configuration of the machine tool control method according to the present invention are the same as those of the machine tool according to the present invention described above. Hereinafter, the differences will be mainly described.

Data for distributing the number of rotations of the main spindle and the sub-spindle according to the target value is stored in the memory unit.

After the data storage step (S1), data for the target value is received through the input unit.

After the target value receiving step ( S2 ), the rotation speed distribution method of the main spindle and the sub-spindle is selected through the selection unit. The step of selecting the rotation speed distribution method of the main spindle and sub spindle consists of a manual distribution method, a main spindle fixed value maintenance method, and an automatic distribution method. Thus, it is possible to determine the distribution of the rotation speed between the main spindle and the sub-spindle.

When the operator selects the automatic distribution method in the step of selecting the rotation speed distribution method of the main spindle and the sub spindle, the rotation speed distribution ratio is automatically calculated and all subsequent steps are performed.

In addition, in the case of selecting the manual distribution method in the step of selecting the rotation speed distribution method of the main spindle and sub spindle, the rotation speed distribution ratio of the main spindle and the rotation speed distribution ratio of the sub spindle to the target value are determined by the operator through the input unit. The rotation speed distribution ratio of the main spindle and sub-spindle is determined by the manual input value. That is, as described above, the number of rotations of the main spindle and sub-spindle is determined based on the rotation speed-output diagram of the main spindle and sub-spindle based on the rotation speed or rotation speed distribution ratio arbitrarily input by the operator. That is, if the manual distribution method is selected in the step of selecting the rotation speed distribution method of the main spindle and the sub spindle, the confirmation step S4, the load calculation step S5, the rotation speed distribution ratio calculation step S6, and determination Without going through step S7, a command (step S8) and analysis (step S8) are performed through the command unit according to the manually determined speed distribution ratio determined immediately. After that, it is determined whether normal operation is performed according to the analysis step, and if it is determined to be normal, turning by high-speed rotation is performed, and if it is determined to be abnormal, an alarm is generated.

Similarly, if the main spindle fixed value maintenance method is selected in the step of selecting the rotation speed distribution method between the main spindle and the sub spindle, the main spindle rotates from the target value based on the main spindle rotation speed fixed value stored in the basic data storage unit. Subspindle rotation speed distribution ratio is determined by subtracting the fixed number value. That is, without going through the verification and load calculation steps, the distribution ratio calculator subtracts the fixed main spindle rotation speed from the target value to calculate the rotation speed distribution ratio of the main spindle and the sub spindle, and then the same step as the automatic distribution step will perform In addition, the fixed main spindle rotation speed can be set in various ways according to the type of work piece, diameter, weight, length, type of main spindle and sub-spindle, work state, and the type of main spindle driving unit and sub-spindle driving unit. can be stored in the form.

Thereafter, the next step will be described based on automatic distribution method selection.

After the rotation speed distribution method selection step (S3), the operation state of the main spindle and the sub-spindle and the machining diameter and target value of the workpiece are checked in the confirmation unit.

After the check step S4, the load of the main spindle and the sub-spindle is calculated by the load calculator.

After the load calculation step ( S5 ), the distribution ratio calculator calculates the distribution ratio of the rotation speed of the main spindle and the sub spindle with respect to the target value.

After the rotation speed distribution ratio calculation step S6, the determination unit determines the rotation directions of the main spindle and the sub-spindle and the feeding direction of the tool by the calculated rotation speed distribution ratio.

After the determination step (S7), the command unit outputs a distribution signal for transferring the tool through the tool transfer unit according to the determination result of the determination unit and rotating the main spindle and the sub spindle in opposite directions according to the calculated rotation speed distribution ratio do.

After the command step (S8) of outputting the distribution signal, when the main spindle and the sub-spindle are rotated in opposite directions to each other and rotated to the target value by the relative speed, feedback data according to the operation of the main spindle driver and the sub-spindle driver It is stored in real time, and the analysis unit analyzes whether the main spindle and sub-spindle operate normally by comparing the feedback data and the distribution signal. In addition, the analysis unit may store feedback data according to the operation of the spindle moving unit and the driving unit of the tool transfer unit in real time, and compare the feedback data with the distribution signal to analyze whether the entire equipment operates normally. If, as a result of the analysis of the analysis unit, normal operation is found, turning by high-speed rotation is continuously performed, and an alarm is generated in case of abnormal operation or abnormality.

As such, in the method of controlling a machine tool according to the present invention, the number of rotations of the main spindle and the sub-spindle are automatically distributed according to the target value of the rotation speed desired by the operator, and the number of rotations automatically distributed in the best state according to the state of the equipment is used. By rotating the main spindle and sub-spindle in opposite directions to each other, it is possible to minimize vibration and noise while performing high-speed rotation at the turning center without torque loss, thereby improving machining precision and increasing tool life by minimizing vibration and torque damage. In addition, the turning center performs turning that requires high-speed rotation without replacing the workpiece with other equipment other than the turning center, thereby maximizing productivity by reducing non-working time, reducing machining costs, and preventing worker safety accidents in advance. It can improve worker and consumer satisfaction.

In the detailed description of the present invention described above, it has been described with reference to preferred embodiments of the present invention, but those skilled in the art or those having ordinary knowledge in the technical field of the present invention described in the claims to be described later It will be understood that various modifications and variations of the present invention can be made without departing from the spirit and scope of the present invention. Accordingly, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

1: machine tool, 100: main spindle,
200: main spindle driving unit, 300: sub spindle,
400: sub spindle driving unit, 500: spindle moving unit,
600: tool transfer unit, 700: control unit,
710: input unit, 720: memory unit,
730: arithmetic unit, 740: distribution unit,
750: analysis unit, 760: selection unit,
770: display unit.

Claims (14)

a main spindle for clamping the workpiece or tool;
a main spindle driving unit for rotationally driving the main spindle;
a sub-spindle for clamping a workpiece or a tool opposite to the main spindle;
a sub-spindle driving unit for rotationally driving the sub-spindle; and
Includes; a control unit for controlling rotation of the main spindle and the sub-spindle;
The control unit distributes the number of rotations of the main spindle and the sub-spindle according to a target value, rotates the main spindle and the sub-spindle in opposite directions according to the distributed number of rotations, and rotates by the target value by the relative speed. A machine tool, characterized in that it performs.
According to claim 1,
The control unit is
a memory unit for distributing the number of rotations of the main spindle and the sub-spindle and storing information for performing reverse rotation of the main spindle and the sub-spindle with respect to the target value;
an input unit for inputting the target value, the manual distribution ratio, or information stored in the memory unit;
a calculation unit for calculating a rotation speed distribution ratio of the main spindle and the sub-spindle based on the target value and information stored in the memory unit; and
A distribution unit that determines a rotation direction of the main spindle and the sub-spindle and rotates the main spindle and the sub-spindle in opposite directions according to the result of the operation unit to perform a high-speed rotation corresponding to the target value. Characteristics of machine tools.
3. The method of claim 2,
The memory unit,
a basic data storage unit for storing data on the highest and lowest rotational speeds of the main spindle and the sub-spindle, the friction coefficient between the main spindle and the sub-spindle, a fixed rotational speed of the main spindle, and a machining program;
an input data storage unit for storing the target value or manual distribution ratio input through the input unit;
a workpiece data storage unit for storing workpiece data on the type, diameter, weight, and length of the workpiece;
a main spindle data storage unit for storing data on output, rotational speed, and torque according to the operating state of the main spindle;
a sub-spindle data storage unit for storing data on output, rotational speed, and torque according to the operating state of the sub-spindle; and
and a load data storage unit for storing load data and friction coefficient data of the main spindle and the sub spindle.
3. The method of claim 2,
The calculation unit,
a confirmation unit for confirming the operation state of the main spindle and the sub-spindle, the machining diameter of the workpiece, and the target value according to the data stored in the storage unit; and
a load calculator configured to calculate the loads of the main spindle and the sub-spindle based on the data stored in the storage unit and the verification result of the check unit; and
and a distribution ratio calculation unit for calculating a rotation speed distribution ratio for the target value of the main spindle and the sub spindle based on the data stored in the storage unit and the load value calculated by the load calculation unit. machine tools.
3. The method of claim 2,
The distribution unit,
a determination unit for determining the rotational direction of the main spindle and the sub-spindle and the feeding direction of the tool based on the data stored in the storage unit, the verification result of the verification unit, and the rotation speed distribution ratio calculated through the calculation unit; and
A command unit for transferring the tool according to the determination result of the determination unit and the result of the calculation unit, and outputting a distribution signal for rotating the main spindle and the sub-spindle in opposite directions according to the calculated rotation speed distribution ratio; includes; Machine tool, characterized in that.
3. The method of claim 2,
The control unit is
When the main spindle and the sub-spindle are rotated in opposite directions through the distribution unit to rotate to the target value by relative speed, feedback data according to the operation of the main spindle driver and the sub-spindle driver is stored in real time, , an analysis unit that compares the feedback data with the signal transmitted from the distribution unit to analyze whether the main spindle and the sub spindle operate normally.
3. The method of claim 2,
The control unit is
a selection unit for selecting a rotation speed distribution method between the main spindle and the sub-spindle; and
and a display unit for displaying results of the input unit, the memory unit, the calculation unit, the distribution unit, the analysis unit, and the selection unit.
According to claim 1,
a spindle moving part for moving the main spindle or the sub-spindle; and
and a tool transfer unit for transferring the tool clamped to the main spindle or the sub-spindle.
9. The method of claim 8,
The tool transfer unit moves the tool in the height direction through a cylinder method, a linear motor method, or a cam drive method in order to process the workpiece clamped to the main spindle or the sub-spindle.
storing data for distributing the number of rotations of the main spindle and the sub-spindle according to the target value;
receiving data on the target value;
selecting a rotation speed distribution method between the main spindle and the sub-spindle;
checking the operating states of the main spindle and the sub-spindle, the machining diameter of the workpiece, and the target value;
calculating loads of the main spindle and the sub-spindle;
calculating a rotation speed distribution ratio of the main spindle and the sub spindle with respect to the target value;
determining the rotational direction of the main spindle and the sub-spindle and the feeding direction of the tool based on the calculated rotational speed distribution ratio; and
and outputting a distribution signal for transferring the tool according to the determination result and rotating the main spindle and the sub-spindle in opposite directions according to the calculated rotation speed distribution ratio. control method.
11. The method of claim 10,
After outputting the distribution signal,
When the main spindle and the sub-spindle are rotated in opposite directions to each other to rotate to the target value by relative speed, feedback data according to the operation of the main spindle driver and the sub-spindle driver is stored in real time, and the feedback data and the distribution are performed. and comparing signals to analyze whether the main spindle and the sub-spindle operate normally.
11. The method of claim 10,
The step of selecting the rotation speed distribution method of the main spindle and the sub spindle comprises a manual distribution method, a main spindle fixed value maintenance method, and an automatic distribution method.
11. The method of claim 10,
When the automatic distribution method is selected in the step of selecting the rotation speed distribution method of the main spindle and the sub-spindle, the rotation speed distribution ratio is automatically calculated, and when the manual distribution method is selected, the main spindle A method for controlling a machine tool, characterized in that the rotation speed distribution ratio of the main spindle and the sub spindle is determined by a manually input value of the rotation speed distribution ratio of the spindle and the rotation speed distribution ratio of the sub spindle.
11. The method of claim 10,
When selecting the main spindle fixed value maintenance method in the step of selecting the rotation speed distribution method between the main spindle and the sub-spindle, the main spindle rotation speed is fixed at the target value based on a pre-stored fixed main spindle rotation speed value A method of controlling a machine tool, characterized in that the rotation speed distribution ratio of the sub-spindle is determined by subtracting the value.

Images