JPH0745762Y2 - NC data creation device - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to an apparatus for producing NC data for three-dimensional processing.

[Prior art]

Conventionally, machining conditions (spindle speed S and feed speed F) are used in NC data creation devices (including interactive NC data creation devices).
Stores the relationship between them and each factor such as the material of the workpiece, the type of tool, diameter, setting length, material, etc. in table format, and decides by searching the table according to the condition. There is.

[Problems to be solved by the device]

Originally, there are many factors that should be taken into consideration when determining the processing conditions (spindle speed S and feed rate), and organizing the relationship between all the factors and the processing conditions in a table format requires a large storage capacity. It is physically difficult because it is necessary, and even if it is possible, it will be virtually impossible to add or change. The present invention has been made to solve the above problems, and an object thereof is to efficiently determine processing conditions with a small storage capacity. That is, when determining the machining conditions, among the factors, the material of the workpiece, the type of tool,
The relationship between the one having a large influence such as the diameter and the number of blades (hereinafter referred to as the main factor) and the processing condition (spindle speed S and feed speed F) is stored as a standard processing condition database.
In addition, the processing accuracy and finish surface roughness of the workpiece, tool material, etc.
The effects of factors not included in the main factor (hereinafter referred to as sub-factors) are separated from the standard machining condition database, and "1F (value of main factor / sub-factor = specific value) ~ THEN (change coefficient for standard machining conditions) ) ”Is described in a rule format and the set is stored as a processing condition change rule base.
By configuring as described above, the object of the present invention is that many factors can be considered, addition / deletion of factors and change of the relationship between factors and processing conditions can be easily performed, and the main factors and sub-factors It is an object of the present invention to provide an NC data creation device that can easily perform fine adjustment of machining conditions simply by changing the combination and the change coefficient.

[Means for Solving the Problems]

The configuration of the invention for solving the above-mentioned problem is an apparatus for creating NC data of a machine tool for machining a workpiece according to a tool path with a tool, in which at least one of the material of the workpiece, the type of the tool, the diameter and the number of blades is used. , A standard machining condition database storing a relational table of standard machining conditions consisting of at least one of the spindle rotational speed S and the feed rate F determined by this main factor, the main factor, and other than the main factor The condition is a combination with a sub-factor consisting of at least one of the shape of the workpiece, the machining accuracy, the finished surface roughness, and the material of the tool that causes the change in the machining conditions, and the change coefficient for changing the standard machining conditions is As a conclusion, a rule is constructed, a processing condition change rule base for storing this rule, an input means for inputting a main factor and a subfactor, and a main cause input by this input means. The standard processing condition database is searched from the value of and the standard processing condition determining means for determining the standard processing condition and the success or failure of each rule of the processing condition change rule base is determined from the values of the main factor and the sub-factor input from the input means. And the rule determining means determines a change coefficient from the conclusion of the established rule when the rule is satisfied in the processing condition change rule base, and the standard processing condition is determined by the change coefficient. It is characterized by further comprising: machining condition changing means for changing the standard machining conditions determined by the determining means; and NC data generating means for generating NC data according to the machining conditions and tool paths changed by the machining condition changing means. .

[Action]

In the standard machining condition database, the main factors consisting of at least one of the material of the workpiece, the type of tool, the diameter and the number of flutes, and at least one of the spindle speed S and the feed rate F determined by these main factors are stored. The relationship table with the standard processing conditions is stored. Further, the processing condition change rule base includes a main factor and a sub-factor which is at least one of the shape of the workpiece, the processing accuracy, the finished surface roughness, and the material of the tool, which causes the processing condition to be changed in addition to the main factor. A rule is stored in which the combination of is used as a condition, and a change coefficient for changing the standard machining condition is used as a conclusion for the condition. Then, the standard machining condition database is searched from the values of the main factors to determine the standard machining conditions. Next, the success or failure of each rule of the processing condition change rule base is determined from the values of the main factor and the sub factor input from the input means, and when it is determined that there is a rule that is satisfied in the processing condition change rule base, it is satisfied. The change coefficient is determined based on the conclusion of the rule. Then, the standard processing condition determined by the standard processing condition determining means is changed by the change coefficient. Finally,
NC data is generated according to the machining conditions and the tool path changed by the machining condition changing means.

【Example】

Hereinafter, the present invention will be described based on specific embodiments. In FIG. 2, numeral 10 is a numerical controller, and servo motor drive circuits DUX, DUT, DUZ and a sequence controller 11 are connected to the numerical controller 10 via an interface not shown. On the other hand, 20 is a machining center type machine tool which is controlled by the numerical control device having the above-mentioned configuration, and the machining is performed by the rotation of the servomotors 21, 22, 23 driven by the servomotor drive circuits DUX, DUY, DUZ, respectively. The relative position between the workpiece table 25 that supports the workpiece W and the spindle head 24 that mounts the spindle 26 driven by the spindle motor SM is three-dimensionally changed. Further, 27 is a tool magazine for holding a plurality of types of tools, and a tool in the tool magazine 27 is selectively mounted on the spindle 26 by a magazine indexing device and a tool exchanging device 28, which are not shown, Processing is performed. The sequence controller 11 also includes a spindle motor drive circuit 15 for controlling the number of revolutions of the computer 12 and the spindle motor SM.
And are connected. The computer 12 includes a microphone processor 12a, a clock signal generation circuit 12b, a ROM 12c, a RAM 12
d, the fixed disk 12e, and the interfaces 12f, 12g, and 12h are mainly configured, and the keyboard 13 and the CRT display device 14 are connected to the interface 12h. Further, in the fixed disk 12e of the computer 12, specifically, as tool path information and standard processing condition database information, for example, material of work piece: carbon steel, type of tool: end mill, diameter: 10, number of blades: 3 In case of, spindle speed S (rpm): 150
0, feed rate F (mm / min.): 200, and workpiece material: carbon steel, tool type: end mill, diameter: 10, number of blades: 4
In the case of, spindle speed S (rpm): 1500, feed speed F (mm / m
in.): 280, ………. As the processing condition change rule base information, IF factor (value of main factor = …………)
…, Number of sub-factors = ……) ~ THEN processing conditions (spindle speed = standard spindle speed x change coefficient, feed rate = standard feed rate x change coefficient) format, specifically IF (tool) Type = end mill, tool material = carbide) to THEN (spindle speed =
Standard spindle speed x 1.2, feed rate = standard feed rate x
1) and IF (tool type = end mill, tool material =
HSS) -THEN (spindle speed = standard spindle speed x 1.1,
Feed rate = standard feed rate × 1), ... Next, the processing procedure of the MPU 12a will be described based on the flowchart of FIG. In step 100, the tool path is shown, and in step 102, FIG. 3 (a).
Create a standard machining condition database as shown in step 10
In order to form a processing condition changing rule base as shown in FIG. 3 (b) at 4, information is input and stored from the keyboard 13 to the fixed disk 12e as described above. Thus, once the standard machining condition database of FIG. 3 (a) and the machining condition change rule base of FIG. 3 (b) have been created on the fixed disk 12e, when creating NC data, step It is executed from the input processing of the factors for specifying the actual processing mode of 106 or less. Regarding the material of the workpiece, the type of tool, the diameter, and the number of blades, which are the main factor information at the time of actual machining in step 106, specifically, for example, the material of the workpiece: carbon steel, aluminum alloy, stainless steel, etc. , Tool type: end mill, face mill cutter, drill, reamer, tap, etc., diameter: 1,
Number of blades: 1, 2, 3, 4,
5, etc. are entered from the keyboard 13 into the RAM 12d by predetermined names, numerical values, symbols, numbers, etc. Then, in step 108, the change coefficient for changing the standard spindle rotation speed and the change coefficient for changing the standard feed rate at the time of actual machining are determined together with the main factor information at the time of actual machining input in step 106. Rough / fine finishing of machining contents such as work piece size, shape, rigidity, tool setting length, blade length, holding part diameter, material, clamp position in fixed state, clamp direction, clamp strength, etc. ,
For accuracy, surface roughness, etc., mechanical power, rigidity, etc.
Specifically, for example, the size of the work piece: normal, fine, etc., the material of the tool: ordinary, high-speed steel, super steel, diamond, etc., and the predetermined name, numerical value, symbol, number, etc., respectively. Is input from the keyboard 13 to the RAM 12d. Next, the routine proceeds to step 110, where the standard machining conditions (spindle speed S and feed rate F) from the standard machining condition database shown in FIG. 3 (a) correspond to the values of the main factors input at step 106. Is searched and the standard processing conditions are determined. Next, the process proceeds to step 112, in which each of the processing condition change rule bases shown in FIG. 3B corresponds to the value of the main factor input in step 106 and the value of the sub-factor input in step 108. The calculation of whether or not the conditional statement of the rule is satisfied is executed. Next, the process proceeds to step 114, and it is determined whether or not there is a rule that is satisfied from the calculation result of the processing condition change rule base in step 112. Then, in the case of YES, the process proceeds to step 116 to execute the conclusion of the established rule, thereby changing the spindle speed S, the feed speed F and the change coefficient of the standard machining conditions to make the actual machining time. The spindle rotation speed S and the feed speed F, which are the processing conditions, are calculated. Then, the process proceeds to step 118, and according to the tool path input in step 100, NC is performed with the spindle rotation speed S and the feed speed F which are the machining conditions at the time of machining calculated in step 116.
Data is generated. Here, in the case of NO in step 114, there is no matching rule, and therefore, the spindle rotation speed S and the feed speed F under the standard machining conditions in step 110 are set as the spindle rotation speed S and the feed speed F in the actual machining. NC data is generated according to the tool path entered at 100, and this program ends.

[Effect of device]

The present invention searches the standard machining condition database from the value of the main factor input by the input means and determines the standard machining condition, and the base of the machining condition change rule from the values of the main factor and the sub-factor. Rule decision means for determining the success or failure of each rule, and when it is determined that there is a rule that holds in the processing condition change rule base, the change coefficient is determined from the conclusion of the rule that holds and the standard processing condition is based on the change coefficient. Since it is equipped with a machining condition changer for changing the machining conditions and NC data generating means for generating NC data according to the machining conditions and the tool path changed by the machining condition changing means, there are many factors for determining the machining conditions. It is easy to add and delete factors and change the relationship between factors and processing conditions.Furthermore, the change factors for the combinations of main factors and sub factors are stored as appropriate. By doing so, fine adjustment of processing conditions can be performed automatically.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the concept of the present invention. FIG. 2 is a configuration diagram showing a configuration of a numerical control device and a machine tool having an NC data creating device according to a specific embodiment of the present invention. FIG. 3 (a) relates to the standard machining condition database in the NC data creating apparatus according to the embodiment, and FIG. 3 (b) relates to the embodiment.
Explanatory drawing which showed each structure of the processing condition change rule base in NC data creation apparatus. FIG. 4 is a flow chart showing a processing procedure of the CPU used in the apparatus of the embodiment. 10 …… Numerical control device, 12 …… Computer 12a …… Microprocessor 12e …… Fixed disk, 20 …… Machine tool 21,22,23 …… Servo motor 25 …… Workpiece table, SM …… Spindle motor W… … Workpiece

Claims (1)

[Scope of utility model registration request] 1. An apparatus for creating NC data of a machine tool for machining a workpiece according to a tool path with a tool, comprising: a main factor consisting of at least one of the material of the workpiece, the type of the tool, the diameter and the number of flutes. , A standard machining condition database storing a relational table of standard machining conditions consisting of at least one of the spindle rotational speed S and the feed rate F determined by this main factor, the main factor, and machining conditions other than the main factor. Of the change factor that changes the standard machining conditions on the condition of a combination with a sub-factor consisting of at least one of the shape of the workpiece, the machining accuracy, the finished surface roughness, and the material of the tool that causes the change. And a processing condition change rule base for storing the rule, input means for inputting the main factor and the sub-factor, and input from this input means. Standard machining condition determining means for searching the standard machining condition database from the values of the main factors and determining standard machining conditions, and changing the machining conditions from the values of the main factor and the sub-factor input from the input means. When the rule determination means for determining the success or failure of each rule of the rule base and the rule that is satisfied in the processing condition change rule base are determined by the rule determination means, the change coefficient is determined from the conclusion of the satisfied rule. Then, NC data is generated according to the machining condition changing means for changing the standard machining condition determined by the standard machining condition determining means by the change coefficient, the machining condition changed by the machining condition changing means and the tool path. An NC data creating device, comprising: