JPH0236036A - Indication method for input of work - Google Patents

Abstract

PURPOSE:To enable an optimum work input indication corresponding to the capacity of a production line by holding a line constraint condition according to the processing capacity of a line and preferentially performing the input indication satisfying the both of the constraint conditions of a line and work. CONSTITUTION:The respective input indication data are fed from a work and data memory 46, a work constraint conditions data memory 48 and a work specification data memory 50 and the necessary work data are fed by the work recognition part 52 of from a line to the work and data memory 46 at an indication forming part 42. Not only the work constraint conditions but also line constraint conditions data are fed from a line constraint conditions data memory 54 to the indication forming part 42. Consequently, the input indication satisfyling the both simultaneously is given to an indication terminal 44 by deciding the both of the work constraint conditions data and this line constraint conditions data by the indication forming part 42.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a method for instructing the input of workpieces in a production process, particularly when re-inputting reworked workpieces into the line in a mixed production line, or when a previous process has been completed. To rationally maintain both the laymanship of the workpiece and the line capacity when inputting the workpiece to the subsequent process [Conventional technology] In manufacturing in a factory, for example, the manufacturing process of vehicles, multiple types of products are manufactured in each process. Products are often manufactured on the same line, and in recent years, as consumer tastes have diversified, the number of types of products manufactured on the same production line has increased, and high-mix, low-volume production has become commonplace.

Therefore, in the production process, such as the vehicle painting process or assembly process, in order to properly manage the production progress of the equipment or work and improve the overall work efficiency, the transport order of vehicle workpieces is optimized according to each process. Vehicle workpieces must be supplied to each process as a combination.

For example, in an automobile assembly factory that produces multiple car models and table models, the order of vehicles flowing on the line is arranged in a standardized order in order to equalize the time required for assembly work and parts consumption intervals in each process. There is a need. For this reason, the optimal order for each process is planned in advance during production planning, and assembly is started from the body welding process in that order.

However, despite these initial settings, there are cases of rework due to quality defects during the painting process, returns, and two-tone cars.
The work is frequently removed from the line and reintroduced into the line due to circulation, etc., and the order at the start of work is disrupted, making it impossible to proceed to the final process in the same order without making any changes.

Therefore, when a vehicle that has been once removed for masking a defective vehicle or two-tone vehicle is placed in the middle of the line or reintroduced to the subsequent process, or when the initial order has changed due to a modified vehicle, the level It becomes necessary to reinsert it in a position where it does not disturb the formation.

FIG. 5 shows an example of a mixed production line for vehicles to which the conventional work input instruction method is applied.

In the figure, the work line for the vehicle work 10 is divided into a front process line and a back process line, and according to the embodiment, the painting line 12 forms the front process line, and the assembly line 14 forms the back process line. , line 1 (not shown)
Controlled by a control panel.

Between the two lines 12 and 14 there are holding lines of appropriate width, three holding lines 16a and 16b according to the embodiment.
, 16c is provided, and is used as a holding area for holding workpieces for rework or input to the line. Therefore, when only rework is required in the painting line 12, the workpiece 10 removed from the sending position or midway through the line is sent to the holding line 16 after the necessary rework, or is directly subjected to rework in the holding line 16. be done.

Therefore, the workpiece 10 is transferred from the painting line 12 or holding line 16 which is the preceding process to the assembly line 14 which is the subsequent process.
It is necessary to give an instruction to input the above-mentioned items while taking into consideration the change in the arrangement order of each of them, and for this purpose, an input instruction control section 18 is provided. The input instruction control section 18 includes an instruction generation section 20, and gives predetermined input instructions to each line while exchanging information with an instruction terminal 22.

In order for the instruction generation unit 20 to perform the desired input calculation, the input instruction control unit 18 includes a vehicle array data memory 24 that stores the vehicle arrangement order in each line while updating the sequence, and stores the specifications of each of these vehicle works. It includes a vehicle specification data memory 26 for processing and a work constraint condition data memory 28 in which work constraint conditions for determining necessary leveling in post-process work are stored, and the instruction generation unit 20 is supplied with desired data.

In addition, the vehicle arrangement data memory 24 stores the arrangement order of each line as described above, so that the vehicle recognition units 30, 32, 34, 36a from each line are stored.

Vehicle recognition data from 36b and 36c is input.

As described above, according to the conventional input instruction device, the input instruction control section 18 takes in the necessary data, and the instruction generation section 20 directs the vehicle work 10 sent from the painting line 12 to the assembly line 14. or whether to hold this vehicle work 10 on the holding line 16 or to change the arrangement order such as whether to send the work from the holding line 16 to the assembly line 14 instead of the vehicle work 10 from the painting line 12. and give the prescribed instructions.

Examples of the work constraint conditions stored in the work constraint condition data memory 28 are shown in Table 1, and in order to level the post-process, these conditions can be arranged according to the specifications of each vehicle work. The instruction generation unit 20 makes a predetermined judgment so that the order satisfies the work constraint conditions.

Table 1 FIG. 6 shows a flowchart of the work input instruction method in the conventional instruction device described above.

In step 1, when the vehicle workpiece 10 arrives at the exit of the painting line 12, it is determined whether or not a predetermined workpiece constraint condition is met when the workpiece 10 is sent directly to the assembly line 14 in the subsequent process. If it is possible to go directly to the assembly line 14, immediately in step 5, an instruction is given to go directly to the assembly line 14.

On the other hand, if the work constraint conditions are not satisfied in step 1 and direct movement is not possible, the process proceeds to step 2 and the holding line 1
Once the vehicle workpiece at the beginning of No. 6 is inserted, it is determined whether the workpiece constraint conditions are met.

Then, if the work constraint conditions are met when the work from the holding line 16 is held, an instruction is given in step 4 to direct the work sent out from the painting line 12 after being input from the holding line 16 to the assembly line 14. I do.

In step 2, if the work constraint conditions are not complied with even after the input, an instruction is given to hold the vehicle work 10 sent out from the painting line 12 in the holding line 16 in step 3.

As described above, according to the conventional loading instruction method, the loading order is rearranged based on work constraint conditions.

The conventional feeding method described above has already been filed by the applicant as follows.

(1) Japanese Patent Application No. 61-207277 (Japanese Patent Application No. 60-49956) (Japanese Patent Application No. 31076/1982) (3) Japanese Patent Application No. 319326/1982 (4) Japanese Patent Application No. 45389/1983 [The invention Problems to be Solved] However, according to the conventional input instruction method described above,
All of the input conditions are determined as workpiece constraints, so if workpieces are input one after another under conditions that satisfy the leveling of post-processes, the line capacity will overflow and the production line will actually not function properly. The problem was that it stopped working.

Such a problem occurs when a post-process line, for example, an assembly line, is overflowing with workpieces, and if such line capacity is ignored and input is simply instructed based on workpiece constraints as in the past, In some cases, the post-process line stopped functioning.

Another problem is that even when the number of reservations in the reservation line is large, if an excessive number of reservation instructions are issued from the previous process line to the reservation line, the line will also stop functioning.

This kind of problem occurred because the input instructions in the past only took into account the constraints of the workpiece.
The present invention has been made in view of the above-mentioned conventional problems, and includes:
The purpose is to provide an improved method for instructing workpiece input that is capable of instructing optimal workpiece input according to the capacity of a production line.

[Means for Solving the Problems] In order to achieve the above object, the present invention allows a plurality of workpieces to be subjected to different processing or assembly operations to flow in a predetermined order on a line, and to rearrange the workpieces on this line. In a method for instructing the input of workpieces in a mixed flow production line in which production is performed under predetermined workpiece constraint conditions, a line constraint condition determined according to the processing capacity of the line is maintained, and the line constraint condition and the workpiece constraint condition are combined. It is characterized in that an input instruction that satisfies both conditions is given priority.

FIG. 2 shows the configuration of an apparatus to which the input instruction method according to the present invention is applied.

The injection instruction control section 40 includes an instruction generation section 42, and exchanges injection instructions with an instruction terminal 44 in the same manner as in the past.

In the instruction generation section 42, input instruction data is supplied from the workpiece arrangement data memory 46, workpiece constraint condition data memory 48, and workpiece specification data memory 50, as in the conventional case, and the workpiece arrangement data memory 46 is supplied with input instruction data from the line. Desired work data is supplied by the work recognition section 52.

A characteristic feature of the present invention is that, in addition to the work constraint conditions described above, line constraint data is supplied to the instruction generation section 42 from a line constraint condition data memory 54. An example of line constraints in is shown.

This line constraint condition is that when the state of the workpiece on the line meets a predetermined condition j, a predetermined instruction chamber S
These instruction rooms S are given a priority n, respectively.

Therefore, in the present invention, the instruction generation unit 42 determines both the work constraint condition data and this line constraint data, and issues an input instruction that satisfies both at the same time to the instruction terminal device 42.
Give to 4.

[Operation] Therefore, according to the present invention, not only the constraints of the workpiece but also the constraints of the line are taken into consideration when making a determination, and priority is given to input instructions that satisfy both conditions, so that the leveling of the workpiece in the subsequent process is Although the production efficiency is slightly lower, the overall production efficiency can be increased because the line capacity is not exceeded.

FIG. 1 shows a charging instruction method according to the present invention using the device shown in FIG. 2 described above.

In FIG. 1, the relationship between the conditions of the present invention is that first, possible input instruction chambers are selected according to the line constraint conditions, and from among these instruction chambers, one that satisfies the work constraint conditions is selected. 11 determined.

In step 10, all line constraint conditions shown in Table 2 are determined, and in step 11, it is determined whether or not the conditions are satisfied.

If the line constraint conditions do not apply, step 1
5, and the line constraint condition is not taken into account.

On the other hand, if the line constraint condition is met in step 11, all the instruction chambers given from Table 2 are taken out, and in step 12, one of the instruction chambers that satisfies the work constraint condition is selected.

In step 13, it is determined whether or not there is an instruction chamber that satisfies both of the above-mentioned constraint conditions. If the two conditions do not match, the process proceeds to step 15, where the conventional input instruction operation is performed.

On the other hand, in the present invention, if both constraint conditions are satisfied in step 13, an instruction room with a higher priority is selected from the selected instruction rooms in step 14, and this is adopted as the official instruction.

As is clear from FIG. 1, according to the present invention, a charging instruction is determined based on both work constraint conditions and line constraint conditions,
Of course, in the present invention, both constraint conditions are determined regardless of the order in which they are determined.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 3 shows a case in which the present invention is used to instruct a vehicle to input a workpiece, and the same members as those in the device shown in FIG.

A characteristic feature of this embodiment is that the line constraint condition data from the line constraint case data memory 154 is supplied to the instruction generation unit 20, so that the vehicle workpiece 10 is arranged in the order in which each workpiece is arranged. Input instructions can be given in accordance with the line conditions of the assembly line 14 or holding line 16 in the subsequent process.

An example of data stored in the line constraint data memory 154 is shown in Table 3.

Table 3 [Example] In Table 3, the smaller the priority value, the higher the priority.

FIG. 4 shows the injection instruction method shown in FIG. 3 in the form of a 70-chart.

In step 20, it is determined whether all the line constraints shown in Table 3 are met, and it is determined whether the line conditions in the assembly line 4 and the holding line 16 at this time match the conditions of the line constraint data.

In step 21, it is determined whether or not the line constraint conditions are met, and if any of the conditions are met, the process proceeds to step 22, where it is determined whether the instruction plan given in Table 3 satisfies the work constraint conditions. will be judged.

In this way, the StellarTub 23 checks for nine instruction plans for which both constraint conditions are satisfied, and if such an instruction plan exists, in step 24, the instruction plan with a higher priority is adopted as the input instruction.

Therefore, the instruction plan selected from step 24 takes into account the line constraints and also satisfies the work constraints, so even if the standardization efficiency of the work on the line is reduced by 1' compared to the conventional method, can also significantly improve overall production efficiency.

-Tsuba In the above flowchart, if the instruction plan based on the line constraint conditions in step 21 or step 23 is not selected, the input instruction based on only the line constraint conditions is performed as in the past, and these instructions are transferred to steps 25 to 29.
Since these steps are the same as steps 1 to 5 in FIG. 6 described above, the explanation thereof will be omitted.

[Effects of the Invention] As explained above, according to the present invention, when sorting workpieces, inputting instructions are determined only based on workpiece constraint conditions such as leveling in the subsequent process, whereas Since it is possible to give input instructions that take the situation into consideration,
It is possible to improve the efficiency of the entire production line without generating input instructions that overflow the processing capacity of the line.

Furthermore, according to the present invention, the line status is always taken into account, so even when changing the line or changing the production volume or production ratio, input instructions are always given in consideration of the newly set line status. , it becomes possible to obtain a mixed flow production line with excellent responsiveness.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a work input instruction method according to the present invention, Fig. 2 is an explanatory diagram of a device to which the input instruction method of Fig. 1 is applied, and Fig. 3 is an explanatory diagram of a device to which the invention is applied to a vehicle production line. FIG. 4 is a flowchart showing an instruction method of the vehicle work input instruction device shown in FIG. 3; FIG. 5 is an explanatory diagram of a conventional input instruction device; FIG. FIG. 6 is a flowchart of a method for instructing input of the device shown in FIG. 5; I2... Pre-process (painting) line 14... Post-process (assembly) line 16... Holding line 18.40... Loading instruction control unit 20.42
... Instruction generation section

Claims (1)

[Claims] A mixed flow production line in which a plurality of workpieces subjected to different processing or assembly operations are passed through a line in a predetermined order, and the workpieces are rearranged on this line under predetermined work constraint conditions. In the method for instructing workpiece input, line constraints determined according to the processing capacity of the line are maintained, and input instructions that satisfy both the line constraint and the workpiece constraint are given priority. How to instruct the input of the workpiece.