JPH02254504A - Nc data generating device for combined hole working - Google Patents

Abstract

PURPOSE:To automatically generate combined hole working NC data in a short time by collectively reading and inputting hole attribute data, which consists of the dimension and shape of a combined hole itself and a quality evaluation value like a finish accuracy, from a work drawing and automatically determine combination of tools to be used to output NC data. CONSTITUTION:Servo motor driving circuits DUX, DUY, and DUZ and a sequence controller 11 are connected to a numerical controller 10 through interface. Hole attribute data consisting of the dimension and shape of the combined hole to be worked and the quality evaluation value like a finish accuracy is read in, and a working step decomposition rule to extract and rank working steps is stored, and a used tool combination rule is stored in accordance with working steps, their order, and hole attribute data. Working steps are extracted and ranked based on hole attribute data to determine combination of tools to be used. Thus, the number of items to be defined by a worker is reduced, and combined hole working NC data is automatically generated in a short time.

Description

[Detailed description of the invention] "Industrial application field" The present invention relates to an NC data creation device for complex hole machining.

Conventional technology When creating NC data for complex hole machining using an automatic NC data creation device, the machining shape, machining method, and machining accuracy of the machining location are grasped from the machining drawing, and the machining shape and machining method are All of this was done manually by selecting tools that matched the machining accuracy and machining accuracy.

However, in machining centers and the like, there are many types of tools used in one machine tool, and tools stored in one tool magazine are also used in other machine tools. Therefore, manually specifying a tool that matches the machining dimensions and provides the desired finishing accuracy requires considerable skill and intuition and a great deal of time.

Recently, interactive NC data creation devices have been developed to reduce the time required to create NC data, but when creating NC data for machining a compound hole, the compound hole must be broken down into multiple six parts. For example, when creating NC data for a three-stage compound hole as shown in Figure 7(a), the operator must define the machining steps, order, and tools used. b) The operator must define the machining steps and order and tools used for each equation by breaking it down into three holes as shown.

To do this, you must call up the drilling details menu for each formula as shown in Figure 8, and define the tools to be used based on the machining steps and order defined by the operator and machining accuracy for each formula. did not become. Moreover, in order to define the machining steps and order, it is necessary to add machining steps that do not appear in the machining drawings, such as center holes, and to omit machining steps by combining multiple holes, and to Since the operator has to define the addition of machining steps, etc., there is a problem that the time required to create the NC data is not significantly reduced.

"Problems to be Solved by the Invention" The present invention was made to solve the above problems, and reduces the number of items that must be defined by the operator, and automatically generates NC data for complex hole machining in a short time. An object of the present invention is to provide an NC data creation device for complex hole machining that can create complex hole machining data.

"Means for Solving the Problems" As shown in FIG. 1, the NC data creation device of the present invention aimed at solving the above problems has quality evaluation values such as the dimensions and shape of a compound hole to be machined and finishing accuracy. a machining step decomposition rule storage means that stores a machining step decomposition rule for extracting and ordering machining steps from the machining data;
A usage tool combination rule storage means that stores usage tool combination rules for omitting machining steps due to compounding, adding machining steps according to the tools used, etc., based on the machining steps and order and hole machining property data; A machining step extraction means that reads a machining step decomposition rule from a step decomposition rule storage means and extracts and orders machining steps based on the permeability data, and a used tool combination rule is read from the used tool combination rule storage means. , a tool combination determining means for determining a combination of tools to be used consisting of a tool name and a usage order based on the machining steps and order and the holeability data;
The present invention is characterized by comprising processing means for processing a combination of used tools to generate NC data.

"Operation" According to the above configuration, the drilling performance data consisting of the dimensions and shape of the compound hole itself and quality evaluation values such as finishing accuracy can be read all at once from the processing drawing without disassembling the compound hole into multiple holes. When inputted by the hole machining data input means, the combination of tools to be used is automatically determined, and NC data for machining a compound hole is output.

"Example" Hereinafter, an example of the present invention will be described based on the drawings. Second
In the figure, 10 is a numerical control device, and this numerical control device 10 includes servo motor drive circuits DUX, DUY, D
The UZ and sequence controller 11 are connected via an unillustrated interface.

On the other hand, 20 is a machining center type machine tool controlled by the numerical control device having the above configuration, and includes servo motors 22, 21, and 23 and a workpiece W driven by the servo motor drive circuits DUX, DUY, and DUZ, respectively.
A workpiece table 25 supports a workpiece table 25, and a spindle head 24 supports a spindle 26 driven by a spindle motor SM, and by driving the servo motors 21, 22, 23, the relative position of the workpiece table 25 and the spindle head can be changed. is changed three-dimensionally. Reference numeral 27 denotes a tool magazine that holds a plurality of types of tools, and the tools in the tool magazine 27 are selectively mounted on the spindle 26 by a magazine indexing device (not shown) and a tool changing device 28 (not shown). Processing is performed.

Further, the sequence controller 11 is connected to a (mini) computer 12 and a spindle motor drive circuit 15 that controls the rotational speed of the spindle motor SM. This (mini)
The computer 12 includes a microprocessor 12a and a clock signal generation circuit 12b.

Mainly composed of ROM 12c, RAM 12d, fixed disk 12e, interfaces 12f, 12g, and 12h, and interface 12h has keyboard 14 and CR.
7 display device 13 and tablet 16 are connected.

and the fixed disk 12 of the (mini)computer 12.
e contains information such as extraction and ordering of machining steps in order to generate machining step decomposition data as shown in Figure 3(c) from hole-like data as shown in Figure 3(b). Processing step decomposition rules to be performed are stored. Also, in the fixed disk 12C, from the machining step decomposition data as shown in FIG. 3(c) and the hole machining data shown in FIG. 3(b), the tools used as shown in FIG. 3(d) are stored. In order to generate combination data, rules for combination of tools to be used are stored that should omit machining steps by combination and add machining steps according to the tools to be used.

That is, the processing drawing shown in FIG. 3(a) shows a compound hole consisting of first, second, and third holes. This compound hole is a bearing mounting hole centered at position (0,0,0). The first stage hole has a diameter of 55 m (finishing is 3 triangles (thickness), diameter accuracy is 0 (O), accuracy comment is 7006 CDB/GNP5, depth from the machined surface is 311. Depth accuracy ±0 .02.The large bottom is a blind hole, and the bottom finish is 3 triangles (wealth).The second hole has a diameter of 48+ui.
, the final finish is 3 triangles (so), and the depth from the machined surface is 110+
em.

The main hole is a blind hole, and the bottom finish is 1 triangular ().The third hole has a diameter of 42 m and the back finish is 3 triangular (vI77).

The depth from the machined surface is 120 mm, and the hole is a through hole. 35th! The hole quality data read from the processing drawing shown in I(a) is shown in FIG. 3(b) using the tablet 16.
The data is manually read into the (mini) computer 12 by an operator as shown in Iffl.

Converting the hole-like nature data shown in FIG. 3(b) to the machining step decomposition data shown in FIG. 3(c) is automatically performed according to a predetermined machining decomposition step rule. The processing steps include first rubbing the material in the center, drilling the third stage, drilling the second stage, performing the second blowing process, drilling the first stage, The process starts with the step of performing the first blowing process. The center kneading step is not shown in the hole machining data, but it is added by the machining step decomposition rule.In the case of this example, the machining steps are the 3rd hole, the 2nd hole, and the 1st hole. The 0th order, which is determined by the processing step decomposition rules to order the holes in the eye, is the finishing step, which is a step for semi-finishing the holes in the third stage, and a step for finishing the through holes in the third stage. , a step of semi-finishing the second-stage hole, a step of finishing the second-stage blind hole, a step of semi-finishing the first-stage hole, and a step of finishing the first-stage blind hole. Decomposed.

Extracting machining steps such as rough machining, semi-finishing, and finishing is determined by machining step decomposition rules.

Converting the machining step decomposition data shown in FIG. 3(c) to the tool combination data shown in FIG. 3(d) is automatically performed according to a predetermined tool combination rule. The tools used are required to be combined in the order of the machining steps. First, for the first center kneading step, a center drill with a machining diameter of NIL is required.
A drill with a processing diameter of 22 m is required to perform the two-step step before the prepared hole of the step. The hole diameter of the third stage is 42-ring, but since a pilot hole machining step is required first to reduce the machining load, the nominal diameter is φ2 due to the tool combination rules used.
For the 1st and 3rd stage drilling steps, a drill with a diameter of 2.0 is required, the 0th order and 2nd stage Taisei machining step, where a drill with a machining diameter of 41.0+e- is required. In order to do this, roughing with a processing diameter of 47.0 mm is required. The drill for the second drilling step is
Since this is a compound hole machining, a drill with a machining diameter of 50.0 mm is required in order to perform the 0th-order and 1st step pre-preparatory hole two-stepping, which is omitted due to the tool combination rules. The diameter of the first stage hole is 55, which is ugly, but since two steps before the pilot hole are required, a drill with a nominal diameter of 50.0 is required according to the tool combination rules. For the first Taisei machining step, the machining diameter is 52.
For the 3rd hole finishing step, which requires an end mill with a diameter of 0 mm and a nominal diameter of 50, the machining diameter is 41 mm.
Finish poling with a nominal diameter of 40 to 42 degrees is required. For the third through-hole finishing step, a finished poling with a machining diameter of 42.0 mm and a nominal diameter of φ42 is required. For the second-stage mid-hole finishing step, a finishing hole with a processing diameter of 47.5 m (nominally φ45-48 is required).For the second-stage blind hole finishing step, a processing diameter of 48°0 is required. The 0th-order 1st stage mid-hole finishing step, which requires finish poling with a nominal diameter of φ48, is assumed to be finished with the machining diameter according to the tool combination rules because an accuracy comment is attached. , The 0th order for which tool selection is omitted is the first blind hole finishing step, but because it has a high dimensional accuracy of ±0.02, it is possible to finish the blind hole at the machining diameter according to the tool combination rules used. Tool selection is omitted for hole finishing.

Next, the processing procedure of the MPU 12a will be explained based on the flowchart of FIG.

In step 100, hole machining data of the compound hole, that is, machining definition data is input based on the machining drawing of each machining location.
In the next step 102, a machining method consisting of machining steps and sequences is extracted from the machining data based on the machining step decomposition rules. Then, in step 104, the tools for each machining method, that is, the machining steps and order, are determined based on the tool combination rule from the hole-cutting data. Step 106 and step 108 are N
This is a process for creating C data, and step 106
The machining order is determined in step 108, and the tool trajectory and machining conditions are determined in step 108. Then, in step 110, the NC data is, for example, X.

It is output in the form of Y, Z, G...

Details of steps 102 and 104 will be further explained with reference to FIG.

The subroutine for extracting the processing method in step 102 is the fifth subroutine.
As shown in Figure (a), the presence or absence of processing constraints is checked in step S20, and processing constraints exist (YES).
In the case of , the hole machining property is changed in the next step S22, and in the case of no machining constraints (No), the process jumps to step S24.In the step S24, the machining steps are extracted, and in the next step S26, the machining steps are ordered. .

The subroutine for determining the tool in step 104 is as shown in FIG. 5(b), in which the hole shape is initialized in step 840, and tool candidates are extracted in the next step S41. Then, in step S42, a tool is determined based on the machining depth, remaining finishing allowance, presence or absence of a W step, various evaluation values, etc., and in step 843, the hole shape is updated. Then, in step S44, next step control is performed, and if there is a next step (YES), the process returns to step S41, and if there is no next step (NO), step S45 is performed.
Displays tool combinations.

According to the NC data creation device for complex hole machining according to the embodiment of the present invention, compared to the conventional automatic NC data creation device and interactive NC data creation device, as shown in FIG.
The time required to create NC data for machining compound holes has been greatly reduced.

"Effects of the Invention" As described above, the present invention provides a drilling performance data input means for reading drilling performance data consisting of the dimensions and shape of a compound hole to be machined and quality evaluation values such as finishing accuracy, and From a machining step decomposition rule storage means that stores machining step decomposition rules for extracting and ordering machining steps, machining steps and order, and perforability data, omit machining steps by combining and add machining steps according to the tool used. The machining step decomposition rules are read from the usage tool combination rule storage means that stores the usage tool combination rules for performing such operations, and the machining step decomposition rule storage means, and the machining steps are extracted and ordered based on the permeability data. Reading out the tool combination rules from the machining step extracting means and the tool combination rule storage means, and determining the combination of tools to be used consisting of tool names and order of use based on the machining steps and order and the perforability data. Since it is equipped with a means for determining the combination of tools to be used and a processing means for processing the combination of tools to be used and generating NC data, the number of items that the operator has to define is reduced, and the NC data for complex hole machining can be generated in a short time. It has the excellent effect of being able to be created automatically.

[Brief explanation of drawings]

FIG. 1 is a diagram corresponding to claims of the present invention, FIG. 2 is a configuration diagram showing the configuration of an embodiment of the present invention, and FIG. 3 is an explanatory diagram showing each data structure of this embodiment in comparison with a processing drawing. FIG. 4 is a flowchart showing the operation of the same embodiment, and FIGS. 5(a) and (b)
) is a flowchart showing a subroutine, FIG. 6 is a graph showing a comparison of NC data creation time between the device of this embodiment and a conventional device, and FIGS. 7 and 8 are explanatory diagrams showing a conventional NC data creation method. 12, (Mini) computer, 12a, M
PU, 12c,..., ROM 12d,..., RAM
, 12 e, , fixed disk, 16. ,,tablet,102,,,step,104. ,,step. Fig. 1 Fig. 4 (b) Hole machining data Surface condition (machined surface) A 1st stage blind finish ↑ ■ 2F 1st hole semi-finished 3rd stage through-done upper 3rd stage hole semi-finished ↑ First stage Taisei machining ↑ Diagram of tool combinations used (b) Diagram

Claims (1)

[Claims] Hole attribute data input means for reading hole attribute data consisting of the dimensions and shape of a compound hole to be machined and quality evaluation values such as finishing accuracy, and extracting and ordering machining steps from the hole attribute data. From the machining step decomposition rule storage means that stores the machining step decomposition rules, the machining steps and order, and the hole attribute data, the combination of tools to be used that should be used to omit machining steps by compounding, add machining steps according to the tools used, etc. A usage tool combination rule storage means that stores rules; a machining step extraction means that reads machining step decomposition rules from the machining step decomposition rule storage means and extracts and orders machining steps based on hole attribute data; a used tool combination determining means for reading a used tool combination rule from a tool combination rule storage means and determining a combination of used tools consisting of a tool name and a use order based on the machining step and order and the hole attribute data; An NC data creation device for complex hole machining, comprising: processing means for processing a combination of used tools to generate NC data.