JP2000218470A - Turret turning speed determining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set a turret turning speed in accordance with a tool layout without the necessity of previous operation such as turning of the turret before actual machining, and to enhance the machining efficiency. SOLUTION: A turret turning speed determining device is composed of a layout input means 18 for inputting layout data of a tool 3 incorporated in a turret 4, and a determining means 20 for determining a turning speed of the turret 4 in accordance with the inputted layout data. The determining means 20 determines an optimum turret turning speed in accordance with the inputted layout data and a weight of any one of tools 3 stored in a tool weight memory means 19. Further, the determining means 20 determines a turret turning speed for turning in every section between stations S of the turret 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turning speed determining device for determining a turning speed of a turret in a turret type NC machine tool such as a turret lathe.

[0002]

2. Description of the Related Art A turret of a machine tool such as a turret lathe is provided with various tools such as a cutting tool and a rotary tool, and a tool attached to each tool station of the turret is a work piece. They can be changed according to the situation. For this reason, the tool layout may have poor conditions. Layite with poor conditions are, for example, the following. Improper balance between turrets caused by improper installation of relatively heavy and light tools, or lack of tools in some stations. When there are many heavy tools and the total weight of the turret is heavy.

If the turret is turned at a high speed in a layout having such poor conditions, the stopping accuracy is deteriorated. A slight error in stopping accuracy can be corrected to some extent by the meshing coupling generally equipped on the turret.However, if the stopping accuracy is too poor, the coupling will interfere with each other and will be corrected. Can not. In such a case, not only the processing accuracy is reduced, but also the processing becomes impossible.

[0004] For this reason, conventionally, the turning speed is generally set so that the turret can turn stably even in the tool layout under the worst conditions. This does not change even if the tool layout is in good condition. Therefore, processing efficiency is poor and there is room for improvement.

The following measures have been proposed to solve such problems. This involves turning the turret experimentally before actual machining, measuring the power supply to the motor at that time, indirectly detecting the tool layout of the turret from the measured values, and turret according to this tool layout. This is for setting the turning speed. As the measurement result of the supplied power, the average value is used.

However, the above-mentioned proposal has the following problems. It is necessary to turn the turret before the main processing, and it takes time to start the main processing. Since the average value of the current measurement values is used, the turret makes one rotation (360 degrees) as a whole, but the rotation speed is still optimum. There is room.

An object of the present invention is to provide a turret rotation speed determining apparatus which can set a turret rotation speed according to a tool layout without requiring a preliminary operation such as a turret rotation before the main processing, thereby improving the processing efficiency. That is. Another object of the present invention is to make it possible to further increase the speed of turning of the turret between stations while ensuring stop accuracy.

[0008]

The structure of the present invention will be described with reference to FIG. 1 corresponding to an embodiment. This turret turning speed determination device is a device for determining the turning speed of a turret (4) that can be equipped with various types of tools (3) around the turret, and the layout of the tool (3) installed in the turret (4). A layout input means (18) for inputting data;
Turret (4) based on the input layout data
Determining means (20) for determining the turning speed of the vehicle. Thus, the turret (4) is based on the layout data of the tool (3) provided in the turret (4).
In order to determine the turning speed of the turret, it is possible to set the turret turning speed according to the tool layout without performing a preliminary operation such as turret turning before the main processing. Thereby, the processing efficiency can be improved. Layout data can be input easily while the machine tool is stopped.

In the present invention, tool weight storage means (19) for storing the weight of each tool (3) is provided, and the deciding means (20) stores the input layout data and the tool weight storage means (19). The optimal turret rotation speed may be determined from the weight of each tool (3) corresponding to the layout data stored in the turret. As described above, when the turret rotation speed is determined using the layout data and the weight of each tool (3) stored in advance, it is not necessary to input the tool weight every time the layout is changed. , Making input work easier.

In the present invention, the machining program (1
0) is provided, and the determination means (20) is provided with a processing program (10).
In consideration of the above, the turret turning speed may be determined for each turning of the turret (4) between the stations (S). In this manner, by determining the turret turning speed for each station, the time required for turning the turret (4) to index can be further reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing a conceptual configuration of a turret type NC machine tool equipped with the turret rotation speed determining device. This turret type NC machine tool
It comprises a machine tool main body 1 and a control device 2. The machine tool main body 1 is a machine tool provided with a turret 4 to which a tool 3 is attached, and is specifically made of a turret lathe.
The turret 4 is a polygon having a plurality of stations S (S1 to Sn) to which the tool 3 is attached on the outer peripheral surface, and is turned by a turret turning motor 5. A servo motor is used for the turret rotation motor 5. The turret 4 also has a desired station S
An engagement type coupling (not shown) for fixing the turning angle of the turret 4 in a state where the turning is indexed to the processing position P such as the center of the spindle is provided.

The turret 4 is, for example, as shown in FIG.
It is mounted on a turret carriage 7 that moves forward and backward on the bed 6 and turns around a horizontal turning axis O. In addition, as shown in FIG. 4, the turret 4 may be configured to turn around an inclined turning axis O1. In the example shown in the figure, the turret 4 is mounted on a turret carriage 7A which moves forward and backward on the inclined guide of the bed 6A.

As shown in FIG. 1, a control unit 2 numerically controls a machine tool main body 1, and includes a computer such as a personal computer and a control program therefor.
It is mainly composed of data. The control device 2 mainly includes a numerical control function unit 8 that controls feed of each axis of the machine tool main body 1.
And a general processing unit 9 for performing sequence control of the machine tool main body 1 and other various processes. General processing unit 9
May be configured by a programmable controller or the like mainly including a computer device separate from the numerical control function unit 8.

The numerical control function section 8 has a machining program executing means 12, which decodes the machining program 10 to execute a feed command and a tool command for each axis, and also transmits a sequence command to the general program. Transfer to processing section 9. The machining program 10 is stored in the machining program storage means 11, and is stored as an NC code or the like.

The machining program executing means 12 has a tool command executing unit 13, which outputs a turret turning command corresponding to the tool command of the machining program 10 to the servo controller 14 of the turret turning motor 5. . The tool command of the machining program 10 is, for example, a command for designating a station number of an indexing destination for indexing the station S of the turret 4 to the machining position P. The tool command execution unit 13 has a turning speed setting unit 15 and a servo parameter setting command unit 16. The turret turning command is transmitted from the speed set by the turning speed setting unit 15 and from the current indexing station S. The command is the position command of the turning angle up to the indexing station S. The servo parameter setting command section 16 is means for setting servo parameters such as acceleration / deceleration constants to the servo controller 14 when necessary.

The servo controller 14 has variable servo parameters such as acceleration / deceleration constants, and has a servo parameter setting section 17 for setting the servo parameters. The servo controller 14 is a so-called software servo.

The general processing section 9 is a means for executing the sequence command transferred from the machining program executing means 12 to control the machine tool main body 1 and for performing various processing not performed by the numerical control function section 8. . This general processing unit 9
The turret turning speed determination device is provided with a layout input unit 18, a tool weight storage unit 19, and a determination unit 20.

The layout input unit 18 is a unit for inputting layout data of the tool 3 mounted on each station S of the turret 4, and includes a layout input unit 18a.
And a layout data storage unit 18b for storing data input by the input unit 18a. The layout data is data in which, for example, the station number of each station S of the turret 3 is associated with the identification data (for example, tool number) of the tool type of the tool 3 provided in the station S. The layout input unit 18a
Tool type data may be sequentially input for each station S, or layout data previously stored in another storage means may be input collectively via a storage medium, a communication line, or the like. May be. The layout input unit 18a may be a unit for manually inputting a number or the like using a keyboard, or may be a unit for selecting and inputting input data by a predetermined command. The tool weight storage unit 19 is a unit that stores the weight of each tool for each tool type, and stores, for example, data that associates a tool number with a tool weight.

The deciding means 20 comprises a layout input means 18
This is a means for determining the optimum turning speed of the turret 4 from the layout data input by (1) and the weight of each tool 3 corresponding to the layout data stored in the tool weight storage means 19. In this embodiment, the determining means 20
, The turret 4
For each turn between the stations S, the turret turning speed is determined.

The determining means 20 includes a parameter generation unit 21
And a parameter storage unit 22 and a determination processing unit 23. The parameter generation unit 21 is a unit that calculates a predetermined parameter serving as intermediate calculation data for determining the turret turning speed from each data as described above, and the calculation result is stored in the parameter storage unit 22. The determination processing unit 23 is a unit that determines a turret rotation speed or the like using the above parameters. When the processing program execution unit 12 reads out a tool command of the processing program 10, the rotation processing is performed based on the tool command and the parameters. Determine speed, etc.

The determining means 20 specifically determines servo parameters in addition to the turning speed. The servo parameter is an acceleration / deceleration constant or the like. These turning speeds and servo parameters are set for each station S of the turret 4. For this reason, the parameter generation unit 21
The parameters are calculated for each of the stations S. The parameter storage unit 21 stores the parameters for each of the stations S. Parameter generator 2
The interval between the stations S calculated in step 1 means each turning section from any station S of the turret 4 to any station S, that is, a combination of all stations S. Each time the machining program execution means 12 reads a tool command of the machining program 10, the determination processing unit 23 determines a turning speed and a servo parameter corresponding to the tool command by using the parameters calculated and stored in this manner. Are set in the turning speed setting section 15 and the servo parameter setting command section 16.

The turret 4 is located at a certain station S
When indexing to another station S from, the vehicle is turned in a turning direction (for example, a close direction) determined by a setting rule, but the determination processing unit 23 determines a turning speed and the like in the case of the determined turning direction. Further, when the turret turning time depends not only on the turning angle but also on the conditions of the tool layout, such as when turning between stations S 180 ° apart, the determining means 20 selects a turning direction in which turning is completed quickly. Is set in the tool command execution unit 13.

A process of determining a turning speed using the turret turning speed determining device having the above-described structure will be described with reference to a flowchart of FIG. First, as a setup, when a work to be processed (worked shape after processing) is determined (step R1), the layout of the tool 3 mounted on the turret 4 is set to a tool layout according to the work to be processed (R2). After the completion of the tool layout, the layout data is input to the layout data storage unit 1 by the layout input unit 18 (FIG. 1).
8b (R3). The deciding unit 20 (specifically, the parameter generation unit 21) uses the layout data storage unit 1
The layout data registered in 8b is collated with the tool weight storage means 19, and predetermined parameters optimal for turret rotation are calculated from the tool weight and the layout data (R4). The calculated parameters are registered in the parameter storage unit 22.

At the time of actual machining, a machining program 10
When the tool command is executed by the machining program executing means 12, the turning speed and the servo parameters are determined by the determination processing unit 23 according to the corresponding parameters in the parameter storage unit 22 according to the turning section of the tool command (R
5). The result of the determination is set in the turning speed setting unit 15 and the servo parameter setting command unit 16 of the tool command execution unit 13. The servo parameter setting command section 16 sends the determined servo parameters to the servo controller 14.
Is set in the servo parameter setting section 17. In this way, the turret 4 can be turned at the optimum turret turning speed according to the tool layout, and the turret 4 is turned at the highest possible speed without lowering the stopping accuracy, thereby improving the processing efficiency. be able to. In this case, the optimum indexing time, that is, the optimum turning speed can be determined not only from the tool 3 but also from the turning amount of the turret indexing. Further, the turning index time can be reduced by changing the turning time and the like for each station.

In the above-described embodiment, the machining program executing means 12 is provided with the servo parameter setting command section 16. However, without providing the command section 16, the deciding means 20 (specifically, the decision processing section 23) sends The determined servo parameters may be directly set in the servo parameter setting section 17 of the servo controller 14.

[0026]

According to the present invention, there is provided a turret turning speed determining apparatus for inputting layout data of a tool mounted on a turret, and determining means for determining a turret turning speed based on the input layout data. Therefore, the turret rotation speed according to the tool layout can be set without the need for a preliminary operation such as turret rotation before the main processing, and the processing efficiency can be improved. Tool weight storage means for storing the weight of each tool is provided, and the determination means determines an optimum turret rotation speed from the input layout data and the weight of each tool stored in the tool weight storage means. In this case, it is not necessary to input the tool weight every time the layout is changed, and the input operation is simplified. When a machining program storage means is provided, and the deciding means decides a turret rotation speed for each turret rotation between stations in consideration of the processing program, the turret rotation speed between the turret stations is determined. , While keeping the stopping accuracy, it is possible to make it even faster,
The processing efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a conceptual configuration of a control device including a turret turning speed determination device according to an embodiment of the present invention.

FIG. 2 is a flowchart of processing of the turret turning speed determination device and preprocessing thereof.

FIG. 3 is a side view showing an example of a turret type machine tool which is an object of the turret turning speed determination device.

FIG. 4 is a side view showing another example of the turret type machine tool to be used by the turret turning speed determination device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Machine tool main body 15 ... Turning speed setting part 2 ... Control device 17 ... Servo parameter setting part 3 ... Tool 18 ... Layout input means 4 ... Turret 19 ... Tool weight storage means 5 ... Turret turning motor 20 ... Determination means 10 ... Processing Program 21: Parameter generation unit 11: Machining program storage unit 22: Parameter storage unit 12: Machining program execution unit 23: Decision processing unit 13: Tool command execution unit O, O1: Center of rotation 14: Servo controller P: Machining position

Claims (3)

[Claims] 1. An apparatus for determining a turning speed of a turret capable of being equipped with various types of tools around the turret, comprising: layout input means for inputting layout data of a tool mounted on the turret; and input layout data. Determining means for determining a turret turning speed based on the turret turning speed. 2. Tool weight storage means for storing the weight of each tool is provided, wherein said determination means includes input layout data and a weight of each tool corresponding to the layout data stored in said tool weight storage means. 2. The turret turning speed determining device according to claim 1, wherein an optimum turret turning speed is determined from the following. 3. A turret according to claim 2, further comprising a machining program storage means for storing a machining program, wherein said determining means determines a turret rotation speed for each turret rotation between stations in consideration of the processing program. Turning speed determination device.