KR20180092657A - Method and device for setting parameter of machine tool - Google Patents

Abstract

As a method of setting a parameter of a machine tool, one embodiment presented herein may comprise: a step of free-rotating a main shaft of a machine tool on which a workpiece is mounted; a step of obtaining a measurement value of a rotation time, a rotation speed, and a load of the main shaft while free rotation is performed; a step of calculating a moment of inertia of the workpiece from the obtained time, the rotation speed, and the load and an output (P1) of a motor; a step of extracting the optimal parameter matched to the calculated moment of inertia from stored data by matching the parameter corresponding to the moment of inertia; and a step of setting the extracted optimal parameter as machining parameter.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and an apparatus for setting parameters of a machine tool,

At least some embodiments of the present disclosure relate to a method and apparatus for parameter setting of a machine tool.

A wide range of machine tools, including turning centers, machining centers, doormat machining centers, swiss turns, electric discharge machines, horizontal NC boring machines and CNC lathes, are widely used in a variety of industrial applications to suit their application.

As shown in FIG. 1, various types of machine tools currently in use generally have an operation panel 9 to which numerical control (NC) or computerized numerical control (CNC) technology is applied, Has various function switches (or operation buttons) and a monitor for visually showing the operating state to the user.

1, a main shaft 2 of a machine tool 1, a main shaft motor 3 for driving a main shaft 2, a column 4 for supporting a main shaft 2, a workpiece W, The table 5 is formed of a metal.

Today's machine tools accept various parameters required for machining a workpiece directly from the user, or use the standard parameters as they are shipped. The standard parameters are intended for unspecified public workpieces that are not considered by the operator during manufacturing to change the working environment. In general machine tools using standard parameters, if the weight of the workpiece is excessive, it is not possible to optimize the parameters and it is difficult to satisfy the optimum machining conditions. In addition, changes in the work environment, which may occur due to changes in workpiece, excessive weight of the chuck, and assembly errors, can not be taken into consideration during machining, resulting in problems such as shaft shaking and poor quality.

In order to solve this problem, conventionally, a method of measuring a speed change pattern using a torque torque of a conveying shaft or applying a similar value to a similar value using a set parameter has been used. However, it is difficult to accurately reflect the processing environment through this method.

In order to solve the above problem, the operator inputs parameters via the operation panel 9 directly. However, in such a case, it is difficult for the operator to recognize the workpiece information and to calculate the data for calculating the optimum parameter, There is a problem that preparation takes a long time.

It is an object of the present invention to provide a parameter setting apparatus and method for automatically setting an optimal parameter reflecting a working environment of a turning center.

A parameter setting method of a machine tool according to an embodiment of the present invention includes a step of freely rotating a main shaft of a machine tool equipped with a workpiece, a step of measuring a rotation time, a rotational speed, and a load amount of the main shaft while the free rotation is performed Calculating a moment of inertia of the workpiece from the obtained rotation speed, rotation speed, and load of the main shaft and the output of the motor, and comparing the parameters corresponding to the moment of inertia with the stored data, Extracting an optimal parameter matched to the calculated moment of inertia, and setting the extracted optimal parameter as a machining parameter.

The step of freely rotating the main shaft of the machine tool on which the workpiece is mounted includes driving a motor for rotating the main shaft and stopping the driving of the motor after a predetermined time from the motor driving.

A parameter setting device of a machine tool according to an embodiment of the present invention includes an input part for receiving a free rotation command of a main shaft of a machine tool equipped with a workpiece, A memory unit for storing a relationship of calculating a moment of inertia matching parameter table and moment of inertia, and a memory unit for storing the obtained time, rotational speed, And a controller for calculating an inertial moment of the workpiece from the load and the output (P1) of the motor, extracting an optimum parameter from the table corresponding to the calculated moment of inertia, and setting a parameter.

Here, the inertia moment matching parameter table is a table in which the values stored in advance from the relational expressions between the respective moments of inertia and the parameters are recorded.

According to the embodiment of the present invention, in the turning center, the optimal parameter reflecting the working environment can be automatically set in consideration of the change of the working environment which may occur due to the changed workpiece, the excessive weight of the chuck, .

1 is a view for explaining an example of a conventional machine tool.
2 is a block diagram of a parameter setting apparatus of a machine tool according to an embodiment of the present invention.
3 is a flowchart of a parameter setting process of a machine tool according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In describing the embodiments, descriptions of techniques which are well known in the technical field to which this specification belongs and which are not directly related to this specification are not described. This is for the sake of clarity without omitting the unnecessary explanation and without giving the gist of the present invention.

For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated. Also, the size of each component does not entirely reflect the actual size. In the drawings, the same or corresponding components are denoted by the same reference numerals.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present specification will be described with reference to the drawings for explaining a method and an apparatus for setting parameters of a machine tool according to embodiments of the present invention.

2 is a block diagram of a parameter setting device of a machine tool according to an embodiment of the present invention.

Referring to FIG. 2, a parameter setting device of a turning center will be described in more detail than the machine tool according to the embodiment.

A parameter setting apparatus 100 for a machine tool according to an embodiment of the present invention may include an input unit 110, a tool measuring unit 120, a controller 140, and a memory unit 130.

The input unit 110 is used for inputting data from a user as in the operation panel 9 of FIG. 1, and generates an input signal according to a user's operation and transmits the generated signal to the control unit 140.

The input unit 110 includes a touch sensor of a touch screen, a keyboard, a keypad, a mouse, and other input devices that are known or will be developed in the future.

In the present embodiment, the input unit 110 generates a motor drive start signal and a motor drive stop signal for a free rotation command according to a user operation and transmits the generated motor drive start signal and the motor drive stop signal to the controller 140.

The tool measuring unit 120 can measure the rotation time, rotation speed, and load of the main shaft. The tool measuring unit 120 may include various sensors. The tool measuring unit 120 transmits the measured value to the controller 140. For example, a load sensor provided on a spindle motor or a table on which a workpiece is placed measures a load amount, and transmits the measured load amount to the control unit 140. [

The tool measuring unit 120 measures the rotation time, rotation speed, and load of the main shaft when the motor drive battery signal is inputted after inputting the motor drive start signal for the free rotation command. The method of measuring the rotation time, rotation speed, and load of the main shaft is already well known, and thus a detailed description thereof will be omitted here.

The memory unit 130 is installed in a part of the internal memory of the numerical control apparatus NC, more specifically a part of the operation panel 9, and stores a program and data necessary for the operation of the parameter setting apparatus 100 .

The memory unit 130 may be divided into a program area and a data area. The program area includes a program for controlling the overall operation of the parameter setting apparatus 100 and an operating system (OS) for booting the parameter setting apparatus 100, an inertia moment calculation formula, an application program necessary for calculating and outputting moment of inertia, A parameter table 135 matched to the moment of inertia, and the like.

Further, the memory unit 130 may further store the standard parameters stored at the time of shipment. The data area is an area in which data generated according to the operation of the parameter setting apparatus 100 is stored, and can store the value measured by the tool measuring unit 120, the moment of inertia of the workpiece mounted on the main shaft, and the like. Here, the moment of inertia refers to the magnitude of the property of continuously rotating when the force is not exerted at the time of free rotation about the main axis.

The formula of the moment of inertia stored in the memory unit 130 is as follows.

<Relation 1>

P? L x P1

P: Amount of work

P1: Motor output

L: Load

<Relation 2>

T? P / V /?

P: Amount of work

V: Rotational speed

α: Torque constant

T: Talk

<Relation 3>

J? T 占 dt / dv 占?

J: moment of inertia

T: Talk

β: moment of inertia constant

The parameter table matched to the moment of inertia stored in the memory unit 130 may be stored in advance as a value derived from a relational expression between each moment of inertia and the parameter and stored as shown in Table 1 below.

Moment of inertia Gain 1 ( Kp ) Gain 2 ( Ki ) Gain 3 ( Kd ) Acceleration / deceleration A ○ 1 X 1 ' ○ 1 '' ○ 1 '' ' B ○ 2 ○○ 2 ' ○ 2 '' ○ 2 '' ' C ○ 3 ○○ 3 ' ○ 3 '' ○ 3 '' ' D ○ 4 ○○ 4 ' ○ 4 '' ○ 4 '' ' E ○ 5 ○○ 5 ' ○ 5 '' ○ 5 '' ' F ○ 6 ○○ 6 ' ○ 6 '' ○ 6 '' ' G ○ 7 ○○ 7 ' ○ 7 '' ○ 7 '' ' H ○ 8 ○○ 8 ' ○ 8 '' ○ 8 '' ' I ○ 9 ○○ 9 ' ○ 9 '' ○ 9 '' ' .
.
. .
.
. .
.
. .
.
. .
.
. .
.
.

As shown in Table 1, by acquiring only the moment of inertia, the value of the desired parameter can be extracted. For example, if the moment of inertia is A and the parameter to be obtained is gain 1, the value of the parameter of '1' can be obtained.

The control unit 140 controls the overall operation of each component of the parameter setting apparatus 100. In particular, the control unit 140 may control operations for parameter setting of the parameter setting apparatus 100 according to the embodiment of FIG.

The control unit 140 may include a drive control module 142, a calculation module 144, and a setting module 146.

In one embodiment of the present invention, when the free rotation command is received from the input unit 110, the drive control module 142 starts driving the motor of the main shaft, stops the driving after a certain time, do.

The calculation module 144 receives the values measured by the tool measuring unit 120 during free rotation and calculates the moment of inertia of the workpiece reflecting the current working environment.

The setting module 146 extracts an optimal parameter from the calculated moment of inertia and automatically sets the extracted optimum parameter as a machining parameter.

The specific operation of the parameter setting apparatus 100 for automatic parameter setting will be described later in detail with reference to FIG.

3 is a flowchart of a parameter setting process of a machine tool according to an embodiment of the present invention.

The main shaft of the machine tool equipped with the workpiece is freely rotated (S100).

When the user presses the free rotation dedicated button, the motor for rotating the main shaft of the machine tool on which the workpiece is mounted is driven, and after a predetermined time, So that the main shaft rotates freely.

The rotation time, rotation speed, and load of the main shaft during the free rotation are measured and a measured value is obtained (S110).

The inertia moment of the workpiece is calculated from the obtained time, rotation speed, and load amount and the output (P1) of the motor (S120). The rotation speed is the number of revolutions per unit time, and the above-described relational expression 1 is used to calculate the moment of inertia of the work.

First, obtain the amount of load and the output of the motor to obtain the amount of work.

When the amount of work, the rotational speed, and the torque constant (stored in advance) are obtained, the torque T is obtained by using the following expression (2).

The moment of inertia is finally calculated using the relational expression 3 with the value derived from the above.

The optimum parameters matching the calculated moment of inertia are extracted from the stored data by matching parameters corresponding to the moment of inertia (S130).

The final calculated inertia moment is retrieved from the inertia moment matching table stored in advance and the optimal parameter is extracted.

The extracted optimal parameter is set as a machining parameter (S140).

It will be understood by those skilled in the art that the present specification 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 specification is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents are included in the scope of the present specification Should be interpreted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is not intended to limit the scope of the specification. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

100: Parameter setting device
110: input unit
120: Tool measuring section
130: memory unit
140:

Claims (4)

Free rotation of a main shaft of a machine tool equipped with a workpiece;
Obtaining a measurement value of a rotation time, a rotation speed, and a load of the main shaft while the free rotation is performed;
Calculating a moment of inertia of the workpiece from the obtained rotational speed, rotational speed, and load of the main shaft and output of the motor; And
Extracting an optimal parameter matched to the calculated moment of inertia from data stored by matching a parameter corresponding to the moment of inertia; And
Setting the extracted optimal parameter as a machining parameter
And setting the parameter of the machine tool. The method according to claim 1,
Wherein the step of freely rotating the main shaft of the machine tool,
Driving a motor for rotating the main shaft;
Stopping the driving of the motor after a predetermined time from the motor driving
And setting the parameters of the machine tool. An input unit for receiving a free rotation command of a main shaft of a machine tool equipped with the workpiece;
A tool measuring unit for obtaining a rotation time, a rotation speed, a load, and an output of the main shaft while the free rotation is performed;
A memory unit for storing a relational expression for calculating an inertia moment matching parameter table and an inertia moment; And
Calculating an inertia moment of the workpiece from the rotation time, rotation speed, and load amount of the main shaft obtained from the tool measuring unit and the output of the motor, extracting an optimal parameter matched to the moment of inertia from the inertia moment matching parameter table, A control unit for setting an optimum parameter as a machining parameter
And a parameter setting device for setting parameters of the machine tool. In the third aspect,
Wherein the inertia moment matching parameter table is a table in which a value derived in advance from a relational expression between each moment of inertia and a parameter is recorded and stored.

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