JPH03117534A - Nc machine control device - Google Patents

Abstract

PURPOSE:To input a work in advance and to increase the operation rate of a machining center, by performing a work input forecast of each machine based on the actual work time, a standard work time in the initial case of a lot and the work time of the previous time in case of being within the lot. CONSTITUTION:A work input forecasting means 3 reads a work time from a standard work time table 2 in case of the initial work, performing the work input forecasting of a machine by subtracting in order the actual work time by a work time monitor means 1. A work is then input aiming for the time when an input stage is open in case of the work by other machining center MC being progressed, the initial actual work time is obtained at the work completion time and the work time of this time is stored in a memory for using it at the next time. In case of no initial work of the lot, the actual work times up to the present time are subtracted in order similarly from the previous time work actual work times and the work input time is forecast based on this value.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention relates to an NC machine control device controlled by a computer system, and more specifically, by learning the machining time of the NC machine, the operating rate and The present invention relates to an NC machine control device designed to improve productivity.

<Prior Art> FIG. 4 is a conceptual diagram of the configuration of a conventional NC machine control device in which there are a plurality of machining centers within an FMS cell.

In the figure, SC is a cell computer, and MC1 to M
Cn is a plurality of machining centers controlled by this cell computer. These machining centers MCI to MCn are equipped with workstations WS that process products.

The products to be processed are transported to the workstation WS by an automatic pallet changer, and when preparations for processing are completed, the workstation WS is transferred to the cell computer SC.
Processing starts upon receiving a processing command from.

Once the machining is complete, the product (work) is transported to the outstation and the machining is completed.

<Problem to be solved by the invention> In the conventional device, -
(Workpieces were input based on whether or not the machining station was vacant, but not all machining centers' stations were vacant, and there was a wait for the workpiece to be loaded. There was a problem that the operating rate of the system decreased and efficiency deteriorated.

The present invention has been made in view of these points, and is
Increase the operating rate and productivity of the machining center MC by accumulating the time from the start of machining to the completion of machining of JJI I, checking the time and the status of the workpiece input station, and loading the workpiece in advance when conditions are met. The purpose of the present invention is to provide an NC machine control device that can perform the following functions.

Means for Solving the Problems> The present invention that achieves the above-mentioned 1:1 objective includes a cell computer and a plurality of machining centers controlled by the cell computer and each equipped with a work station for machining a member. In the NC machine control device, the cell computer comprises: a machining time monitoring means for monitoring the machining time of each machining center; a standard two-hour table that tabulates the standard machining time for each product; and the machining time monitoring means. The actual machining time obtained,
If it is the first machining time in a lot, the workpiece input is predicted for each machine based on the set machining time obtained by referring to the standard machining time table, and if it is within the lot, it is based on the previous machining time. The in-station is configured to include a work input prediction means that instructs the in-station to input the work if the in-station is vacant.

Effect〉 Each of the above means has the following effect.

The machining time monitoring means integrates the time from the start of MC machining to the completion of machining to determine the actual machining time of the product.

If it is the first of the lot, the work input prediction means sets the time obtained by subtracting the actual machining time from the set machining time read from the standard time table as a new set value, and uses it as the master for the next machining time.

<Example> Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

In the figure, SC is a cell computer and MC is a plurality of machining centers.

In each cell computer SC, 1 is additional time monitoring means for monitoring the machining time of each machining center MC;
is a standard machining time table that shows the standard machining time for each product, and its contents are configured so that they can be rewritten. 3 is the actual machining time obtained by the machining time monitoring means 1, the set machining time obtained by referring to the standard machining time table 2 if it is the first of the lot, and the previous machining time if it is within the lot. Based on this, the work input prediction means predicts the work input of each machine and, if the in-station is vacant, instructs the in-station to input the work.

The operation of the apparatus configured as described above will be explained as follows.

FIG. 2 is a flowchart showing the operations performed by the cell computer SC.

The machining time monitoring means 1 starts integrating the machining time when machining is started. Then, it is determined whether the processing is the first in the lot, and if it is the first, the standard processing time for the corresponding product is read from the standard processing time table 2 for each lot. It is assumed that the standard machining time table 2 for each lot is set by determining the standard machining time at the machining center MC in advance through simulation or the like.

In addition to this table, for example, even if the product is the same, there are slight differences in the machine's habits and operation, and the processing time is not constant.
It is assumed that a dead zone time table is prepared for each MC.

FIG. 3 is a diagram showing the relationship between the standard addition time, set machining time, and dead zone for a certain product A.

Since the actual machining time has not yet been obtained when the work is added at the beginning of the lot, the work input predicting means 3 reads out the standard machining time TA set therein from the standard machining time table 2, and The dead zone TB is read out from the dead zone time table, the total machining time TC is obtained, and the actual machining time is sequentially subtracted from the total machining time TC with time to predict the workpiece input to the machine.

Then, it is determined whether machining by other machining centers MC is progressing, and if so, an operation is performed to load the workpiece into the machining center MC, aiming at a time when the loading stage is open. When the machining is completed, the first actual shipping time is displayed, and the current machining time is stored in, for example, a memory for use next time.

Here, a display means such as a CRT is connected to the cell computer SC, and in addition to this, the entire set machining time is displayed at the same time as L starts, and the remaining machining time is gradually decreased as machining progresses. This makes it easy to predict when the work will be input to the machine.

If the start of machining is not the first machining in the lot, the previous workpiece actual machining time has already been obtained, so perform calculations to sequentially subtract the current machining time from the previous actual machining time, and use this value. The work input point is predicted based on the

Through the above operations, the machining time is first subtracted sequentially from the data from the table, and when machining is completed, the current machining time is used as the reference for the next machining time, and the machining time is sequentially subtracted from this value. Therefore, the reference value is constantly updated, and variations in machining time depending on the workpiece can be eliminated. Moreover, efficient work input can be performed.

<Effects of the Invention> As described above in detail, according to the present invention, it is possible to effectively predict workpiece input and to improve the operating rate of a machining center.

In addition, as the machining is repeated several times, the learning function sets the most suitable machining time for the workpiece, making it possible to provide an NC machine control device that can flexibly respond to increases and decreases in the number of workpieces. .

[Brief explanation of drawings]

Fig. 1 is a configuration block diagram of an embodiment of the present invention, Fig. 2 is a flowchart showing the operations performed by the cell computer SC, and Fig. 3 shows the relationship between the standard machining time, set machining time, and dead zone of product A. FIG. 4 is a conceptual diagram of the configuration of a conventional NC machine control device having a plurality of machining centers within an FMS cell. SC...Cell computer MC...Multiple machining centers...Machining time monitoring means 2...Standard machining time table 3...Work input prediction means Fig. 3 Fig. 4

Claims (1)

[Claims] In an NC machine control device having a cell computer and a plurality of machining centers controlled by the cell computer and each equipped with a workstation for processing a product, the cell computer is configured to control the machining time of each machining center. a standard machining time table that tabulates the standard machining time for each product; an actual machining time obtained by the machining time monitoring means;
If it is the first of a lot, the workpiece input is predicted for each machine based on the set machining time obtained by referring to the standard machining semi-time table, and if it is within the lot, it is based on the previous machining time. 1. An NC machine control device comprising: workpiece input prediction means for instructing the in-station to input a workpiece if the in-station is vacant.