JP2923729B2 - Operation method of automobile assembly line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling vehicles of different models mixed together and transported to a plurality of assembling steps sequentially.
The present invention relates to a method of operating a mixed flow type automobile assembly line.

[0002]

2. Description of the Related Art Conventionally, an automobile assembly line for assembling various parts on a painted automobile body is constituted by a series line. Then, the transportation speed of the vehicle is determined based on the production plan, and the vehicle is sequentially transported to a plurality of assembly processes at a constant speed regardless of the model. Incidentally, the man-hours in the assembly process related to the interior greatly differ depending on the model, and for example, a difference in man-hour between a standard specification model and a high-grade specification model may be almost twice. In this case, in an assembly line composed of straight lines, it is necessary to arrange operation personnel so as to obtain man-hour processing capacity suitable for the model having the maximum man-hour. For example, 1
1 assembly time for models with maximum man-hours when working by humans
200 seconds, transportation time interval of vehicle to assembly process is 100
If it is seconds, 100 seconds is the cycle time,
The assembling process is divided into 12 processes and one person is assigned to each process, for a total of 12 processes.
It is necessary to assign human work personnel.

[0003]

In the above-mentioned apparatus, when the number of man-hours of an automobile to be carried into the assembling process is reduced, the number of working personnel becomes too large. There is a problem that the number of surplus personnel becomes six and the efficiency of the personnel is reduced in a model in which the assembly time is 600 seconds. In view of the above, an object of the present invention is to provide a method of operating an automobile assembly line that can efficiently perform assembling work of a plurality of models having different man-hours with as few workers as possible. I have.

[0004]

In order to achieve the above object,
The present invention relates to an automobile assembly line in which vehicles of different models are mixed and conveyed sequentially to a plurality of assembly processes. Are divided into a plurality of model groups, and the predetermined assembly process is composed of a plurality of branch lines corresponding to the model groups, and the man-hour processing capacity of each branch line is set according to the man-hours of each corresponding model group. However, when vehicles of a plurality of model groups are sequentially carried into the predetermined assembly process, such that the vehicles of each model group flow into each branch line having man-hour processing capacity corresponding to the model group,
If vehicles of multiple model groups are sorted into multiple branch lines in order, and vehicles of the same model group are carried in continuously, a branch line with man-hour processing capacity corresponding to this model group and a higher man-hour processing It is characterized by distributing the car to the branch line with the ability. In this case, it is desirable to supply parts to be assembled in the assembling process to the vehicle on the carrier at the entrance of the predetermined assembling process on the carrier of the vehicle. It should be noted that the different types of vehicles in the present invention include not only different types of vehicles but also vehicles of the same type but different specifications.

[0005]

The operation of the present invention will be described by taking, as an example, a case where automobile models are grouped into three model groups according to the number of man-hours. The assembly work time when one person works is 600 seconds for the first model group with the smallest man-hour, 900 seconds for the second model group with the medium man-hour, and the third model group with the largest man-hour. And 1200 seconds, and the time interval for carrying the vehicle into the predetermined assembly process is 100 seconds.

When vehicles of three model groups are sequentially carried in, the vehicles are sequentially sorted to three branch lines provided according to the number of groups, and the vehicles of the first model group correspond to the three branch lines. 1 branch line,
The vehicle of the second model group flows to the corresponding second branch line, and the vehicle of the third model group flows to the corresponding third branch line. In this case, the time interval for carrying the vehicle into each branch line is 300 seconds, and the number of workers in each branch line required to obtain the man-hour processing capacity corresponding to the man-hour of each model group is the first branch line. In the second branch line, there are two people, the third branch line has four people, and the total number of personnel to be allocated in the assembly process is only nine, which is 12 compared to the conventional example, which required 12 people. Three fewer.

When three or more cars of the first model group are continuously carried in, the cars are first, second and third cars.
Are distributed to the three branch lines in order. in this case,
One person in the second branch line and two people in the third branch line have a surplus of three people, but the number of surplus personnel is halved compared to the conventional example in which six people are surplus. Further, when two vehicles of the second model group are carried in continuously,
And flow to the third two branch lines. In this case, the vehicles of the first and second model groups other than the corresponding model group flow to the second and third branch lines, and the supply of parts becomes troublesome. In this case, as described above, if parts corresponding to the vehicle on the carriage are supplied to the carrier at the entrance of the assembly process as described above, there is no problem even if the vehicle flows on any branch line. It is only necessary to convey the parts to the entrance part, and the parts supply becomes easy.

[0008]

FIG. 1 shows an automobile assembly line for assembling various parts on an automobile body after painting. The assembly line includes a process 1 relating to an instrument panel, a process 2 relating to a window glass, and a process 3 relating to a lowering. A plurality of assembling processes including the interior-related process 4 and the tire and door-related process 5 are arranged.
These assembly processes 1 to 5 are performed by mixing cars of different models.
In order.

The number of man-hours in the interior-related assembly process 4 varies greatly depending on the model. Therefore, based on the number of man-hours in the assembly process 4, a plurality of car models, for example, three models of first, second and third models are used. The assembly process 4 was composed of _{three first} , _second , and _third branch lines 4 ₁ , 4 ₂ , and 4 ₃ corresponding to these model groups.

In the following description, for ease of understanding,
Assuming that the work time when one person performs the work of the assembly process 4 is T, the first model group has T ≦ 600 seconds, the second model group has 600 seconds <T ≦ 900 seconds, and the third model group has 9
It is assumed that 00 <T ≦ 1200 seconds, and the time interval for carrying the vehicle into the assembling process 4 is 100 seconds.

The man-hour processing capacity of each of the branch lines 4 ₁ , 4 ₂ , 4 ₃ is set in accordance with the man-hour of each corresponding model group, and the worker a is the first branch corresponding to the first model group. two line 4 _1, the second branch lines 4 ₂ in three corresponding to the second model group are arranged four to a third branch line 4 ₃ corresponding to the third model group.

As shown in FIG. 2A, a car A belonging to the first model group and a car B belonging to the second model group
If, when the car C belonging to the third model group is carried in the order, the automobile A first branch line 4 _1, car B is the second branch line 4 _2, the car C third branch line 4 ₃
The car is sorted so that it flows to. In this case, a car is carried into each branch line 4 ₁ , 4 ₂ , 4 ₃ at a time interval of 300 seconds. Can be secured 300 × n seconds, and n =
2 car A, n with T ≦ 600 seconds in the first branch line 4 ₁
Car B with T ≦ 900 seconds in the second branch line 4 ₂ of = 3,
n = 4 the third working required steps of the car C in T ≦ 1200 seconds at the branch line 4 ₃ can be carried out respectively.

In the case where the assembling process 4 is constituted by a straight line, 12 workers are required to divide 1200 seconds by 100 seconds, which is the transport time interval of the vehicle, so as to correspond to the vehicle C. In the example, the required number of working personnel is nine, and the number of personnel is small.

The vehicle is a transport vehicle 10 as shown in FIG.
The worker a works on the carrier 10. Entrance part 4 of assembly process 4
_{At 0} , a component input device 11 is provided, and a component shelf 12 storing the components for the vehicle to be assembled in the vehicle on the transport vehicle 10 in the assembly process is placed on the transport vehicle 10 by the component input device 11. Then, the parts are taken out from the parts shelf 12 at each branch line, and the required work is performed.

By the way, car A, car B and car C
Is not constant, and the car A and the car C or the car B may be produced at a ratio of 2: 1. In this case, as shown in FIG.
Two branch lines 4 _1, 4 ₂ in sorting flow, the flow of the car C or vehicle B to the third branch line 4 _3. When the automobile A and the automobile B are produced at a ratio of 1: 2, the automobile A is connected to the first branch line 4 as shown in FIG.
_And the vehicle B is distributed to the second and third branch lines 4 ₂ and 4 ₃ . When producing only automobile A is flowed distributes the automobile A in the first, second and third three branch lines 4 _1, 4 _2, 4 _3. Further, when producing only car B is instead arranged in the first branch line 4 ₁ One of four workforce disposed in the third branch line 4 ₃ As shown in FIG. 2 (d), The automobile B is distributed to the first, second and third three branch lines 4 ₁ , 4 ₂ and 4 ₃ .

In this case, the type of automobile flowing in each branch line becomes unstable, and when parts are supplied in each branch line, it is necessary to convey a plurality of parts to each branch line. , the supply of parts is troublesome, conveyed by the inlet portion 4 ₀ assembly step 4 as described above carriage 10
If supplies components above vehicle not matter if the flow to which the branch line, need only keep conveying the parts of each model to the inlet portion 4 _0, component feeding is facilitated.

[0017] By the way, if you want to produce only car C, the first branch line 4 ₁ to 2 people working personnel, the second branch line 4 ₂ to add one person, the car C first, second and third It is necessary to distribute the flow to the _three branch lines 4 ₁ , 4 ₂ , and 4 _3. However, the car C is a luxury model, and the number of vehicles produced does not increase as much as the left. As there is no such situation, it is unlikely that personnel will be replenished.

[0018]

As is apparent from the above description, according to the present invention, as few as possible workers can assemble a plurality of models of vehicles having different man-hours, thereby improving the efficiency of the personnel. Further, by supplying the parts corresponding to the vehicles on the carriage onto the carriage at the entrance of the assembling process, the parts can be easily supplied.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of an automatic assembly line to which the method of the present invention is applied.

FIGS. 2A to 2D are diagrams showing distribution of vehicles to branch lines.

FIG. 3 is a perspective view of an entrance of an assembling process.

[Explanation of symbols]

4 a predetermined assembly process, 4 ₀ inlet 4 _1, 4 _2, 4 ₃ branch line, 10 conveying cart 11 parts feeding device, 12 parts shelves

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B62D 65/00

Claims (2)

(57) [Claims] In an automobile assembly line in which vehicles of different models are mixed and transported to a plurality of assembly processes in sequence, the number of processes in a predetermined assembly process of the assembly process varies greatly depending on the model. The models are divided into a plurality of model groups, and the predetermined assembling process is composed of a plurality of branch lines corresponding to these model groups, and the man-hour processing capacity of each branch line is adjusted according to the man-hour of each corresponding model group. If a plurality of model groups of vehicles are sequentially loaded into the predetermined assembly process, a plurality of models of each type group are flown to each branch line having man-hour processing capacity corresponding to the type group. If vehicles of a model group are sorted into multiple branch lines in order, and vehicles of the same model group are continuously imported, A method of operating an automobile assembly line, comprising: distributing an automobile to a branch line having a man-hour processing capability corresponding to the model group and a branch line having a man-hour processing capability higher than the branch line. 2. A vehicle assembly according to claim 1, wherein parts to be assembled in the assembly process are supplied to the vehicle on the vehicle at the entrance of the predetermined assembly process on the vehicle. How the line works.