JPH0425345A - Automatic programming device of machine tool - Google Patents

Abstract

PURPOSE:To improve productivity by operating the number of change of chuck claw and tool in accordance with change of workpiece, and providing a set-up change scheduling means which outputs workpiece order by which total number of change becomes the minimum. CONSTITUTION:An automatic deciding function means 8 is a means which performs various automatic decisions which form a machining program 9 automatically by NC data. Various data necessary for automatic decision is stored in a data file 11 of a data file group 10. A set-up change scheduling means 12 prepares a data file 14 for scheduling by which the data required for scheduling is sampled from various data files 11 at the preprocess stage. A workpiece order (machining order) 13 in which the number of exchange of chuck claw and tool becomes the minimum is operated from the file 14 and output. Consequently, it is possible to perform from preparation of machining program to scheduling integrally, perform automatic scheduling of machining order without inputting type of tool, and improve productivity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic programming device for a machine tool that has a setup change scheduling function when processing a plurality of types of workpieces.

[Conventional technology]

Conventionally, for example, scheduling to produce workpieces A, B, C, and D was to produce 100 pieces of workpiece A and 100 pieces of workpiece B'.
50 pieces of 7-ri, 120 pieces of C'7-ri, 2 pieces of D work
This is done based on a production plan such as 00 units.

In this way, in order to process different types of workpieces A to D, setup changes are required as the type of workpieces is changed.

For example, in a turret lathe, it is necessary to replace the chuck jaws on the spindle and the tools attached to the turret.

Such replacement of chuck jaws and tools is generally performed manually, but as the number of replacements increases, the setup change time becomes longer and the operating rate of the machine tool decreases.

Therefore, the workpiece machining order is scheduled so that the number of chuck jaws and tools to be replaced is small. This scheduling is performed by humans by referring to a table showing the types of chuck jaws and tools required for each workpiece.

[Problem to be solved by the invention]

However, scheduling by humans is inefficient, and proper scheduling becomes difficult, especially when the number of types of workpieces and tools used increases.

It is possible to perform computer processing using a dedicated scheduling program, but even with this, it is necessary to input the chuck jaws and tool type for each workpiece, which takes time and effort, and also causes scheduling errors due to input errors. also occurs.

An object of the present invention is to provide an automatic programming device for a machine tool that can automatically schedule machining sequences without inputting tool types and the like, thereby improving productivity.

[Means to solve the problem]

The structure of this invention will be explained with reference to FIG. 1 corresponding to an embodiment. This invention has a storage means O1l that stores the type of chuck jaw and the type of tool required for machining for each workpiece (^) to (D), and is an automatic programming machine tool that automatically generates a machining program (9). The apparatus is equipped with a setup change scheduling means (2).

The setup change scheduling means α2 performs the workpiece (A) to
The number of chuck jaws and tools replaced due to the change in (D) is calculated, and the workpiece permutation a3 that minimizes the total number of replacements is output.

[For production]

The types of chuck jaws and tools required for machining each workpiece (A) to (D) are automatically determined in the process of automatically generating the machining program (9) and stored in the storage means (II).Alternatively, The type of chuck jaw and the type of tool are input into the storage means Ql as data necessary for automatically generating the machining program (9).

The setup change scheduling means a2 inputs the chuck jaw and tool type data obtained for automatically generating the machining program (9), and processes the workpieces (A) to (
A workpiece permutation a3 that minimizes the total number of chuck jaw and tool replacements due to the change in D) is output.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 to 4. This embodiment is applied to a programming device for a turret lathe.

Figure 3 shows the system configuration. A central processing bag with main memory! ! (CPU) 1, input means 2 consisting of a keyboard
, a display means 3 consisting of a Japanese color graphic display, a floppy disk 4, and a hard disk 5.
, a Japanese graphic printer 6, and a paper tape leader/punchaff are connected.

FIG. 1 is a schematic functional block diagram. The automatic determination function means 8 is a means for performing various automatic determinations to automatically generate a machining program 9 based on NC data, and various data necessary for automatic determination are stored in various data files 11 of a data file group 10.

The setup change scheduling means 12 selects a workpiece sequence (machining sequence) 1 in which the number of chuck jaws and tools to be replaced is the minimum.
It is a means to calculate and output 3, and various data files 1
A scheduling data file 14 in which data necessary for scheduling is extracted from 1 is created in the preprocessing stage, and a work permutation I3 with the minimum number of exchanges is created from the file I4.
Calculate.

FIG. 2 shows details of the configuration of FIG. 1. In the tool mask file 15 of the data file group IO, data on, for example, several hundred tools to be mounted on the turret is registered. These tools include rotary tools such as end mills in addition to bits. In the workpiece processing shape data file 16 and the material shape data file 17, the shape after processing and the material shape (material material) are registered for each workpiece. In the machining method data file 19, data 19 on the type and shape of chuck jaws to be used, process order data 20, tooling pattern data 21, etc. are registered. The tooling pattern data 21 includes the tool station number in the turret and the like. Various data such as detailed cutting conditions are registered in the file 22. The exchange time data file 23 includes data 23a of the standard time required for chuck jaw exchange and standard time required for tool exchange.

Data 23b is registered. The used tool/process order file 24 shows the used tools and cutting conditions for each workpiece.

and the process order are stored.

The automatic determination function means 8 includes means 26 for automatically determining the machining area and machining method from the tool, machining shape, and material shape data in the data files 15 to 17, and means for automatically creating the used tools/process order file 24. 27, means 28 for automatically determining various cutting conditions, and means 29 for automatically determining an optimal tool path. The machining program 9 is automatically generated based on the determination results of these automatic determination means 26 to 29.

The interactive human power/display output means 25 uses the input means 2 and the display means 3 to interactively execute a program to proceed with the registration of the data file group IO and to confirm and correct the automatic determination result of the automatic determination function means 8 in an interactive manner. It consists of programs etc. to be executed.

The functions of the setup change scheduling means 12 will be explained with reference to FIG. 4. In the preprocessing (Sl), a scheduling data file 14 is created by extracting only the data necessary for scheduling from each data in the data file group IO shown in FIG. This file 14 is the first
As illustrated in the figure, the types of chuck jaws and tools used for each work are described. Furthermore, the types of workpieces in the file 14 are only those selected in an appropriate input process for scheduling purposes among the workpieces registered in the workpiece machining shape data file 1B (FIG. 1).

After pre-processing (Sl), a process (S2) is performed in which the number of chuck jaws and tools to be replaced due to changes in workpieces is calculated and stored.

A specific method of this calculation will be explained using the example shown in FIG.

The number of tools required to change from work A to work B is as follows from the tool r1.2°3J used for work A.
This is the number of tools r4.5, 6J that are replaced with tools r2, 4, 5°6 used for work B, and the number of tool replacements is 3. Since the types of chuck jaws are different, "1" for workpiece 8 and "3" for workpiece B, the number of chuck jaw replacements is l. The sum of the number of tool changes (3) and the number of chuck jaw changes (1) is 4, which is the number of tool changes when changing from workpiece A to workpiece B. Similarly, the number of replacements when changing from workpiece B to workpiece C is the sum of the number of tool replacements (1) and the number of chuck jaw replacements (1), which is 2. In this way, A, B
, C, and D, the total number of replacements when changing each workpiece is calculated.

This calculation of the number of exchanges (S2) is performed for each work permutation by changing the work permutations (S3), and when the calculation is completed for all work permutations (S4), the work permutation that minimizes the total number of exchanges is found. Select (S5). In the example of FIG. 1, the permutation Δ→CB+D is selected. This workpiece sequence is the minimum machining order for setup change, and the display means 3
The data is output to a floppy disk 4, a printer 6, etc.

Note that if there are multiple work permutations that minimize the total number of transformations, all of the permutations may be output, or a predetermined criterion may be added to output only one permutation.

Further, since the chuck jaws and the tool generally have different replacement times, weighting may be performed as appropriate depending on the replacement time.

For example, when chuck jaws are replaced, the number of chuck jaws replaced is 2, and when changing tools, the number of replacements is 1 for each tool replaced.
shall be. Even if the chuck jaws and tools require approximately the same replacement time, it is desirable to weight them depending on which one is given priority. It is also possible to determine which of the chuck jaws and the tool should be prioritized using a method other than the weighting method.

This automatic programming device uses data on chuck jaws and tool types for each workpiece that have already been obtained as data necessary for automatically generating the machining program 9, and creates a machining order that minimizes the number of chuck jaws and tools to be replaced. can be output.

Therefore, automatic scheduling of the machining order can be performed without having to input the tool type, etc. again, saving the time and effort of input work, eliminating the problem of input errors, and improving productivity.

Although the above embodiment has been described with reference to a case where it is applied to a programming device for a lathe, the present invention can be applied to general machine tools that perform tool exchange and chuck jaw exchange depending on the type of workpiece.

〔Effect of the invention〕

The present invention is an automatic programming device that automatically generates a machining program, and is equipped with a setup change scheduling means, so that data on chuck jaws and tool types for each workpiece that have already been obtained are used as data necessary for generating a machining program. By using this method, it is possible to output a workpiece sequence that minimizes the total number of chuck jaw and tool replacements, that is, a workpiece machining sequence. In this way, the process from creating a machining program to scheduling can be performed consistently, and the machining order can be automatically scheduled without having to input the type of tool again, thereby improving productivity.

[Brief explanation of drawings]

FIG. 1 is a schematic functional block diagram of an embodiment of the present invention.
FIG. 2 is a functional block diagram showing the details, FIG. 3 is an explanatory diagram of the system configuration, and FIG. 4 is a flowchart of the operation of the setup change scheduling means. 2... Input means, 3... Display means, 8... Automatic determination function means, 9... Machining program, 10... Data file group, 12... Setup change scheduling means, 13...・Minimum number of replacement workpiece permutations, 15... Tool mask file, 16... Workpiece machining shape data file, I7... Material shape data file, 19...
Used chuck jaw data, 24... Tool used/process order file, 26... Machining area/machining method automatic determination means,
27...Used tool/process order automatic determination means, 29...
Tool path automatic determination means, A-D...work type chart

Claims (1)

[Claims] In automatic programming devices for machine tools that have a storage means that stores the types of chuck jaws and tools required for machining each workpiece, and automatically generate machining programs, the number of times chuck jaws and tools are replaced due to changes in workpieces. An automatic programming device for a machine tool, characterized in that it is provided with a setup change scheduling means that calculates the number of workpieces to be replaced and outputs a workpiece permutation that minimizes the total number of workpiece changes.