JP4829989B2 - Mixed production line - Google Patents

Description

  The present invention relates to a mixed flow production line.

  Conventionally, when producing different types of workpieces such as workpieces with different production man-hours depending on the model, there are a mixed flow production method using one single line and a production method using dedicated lines.

First, a method for producing a mixed flow on the same line will be described.
For example, if it is assumed that the 14-hour line is operated by two shifts per day, the total operation time per day is 50400 seconds. If the planned production number is 300, the line tact is 50400/300, which is about 170 seconds.
Assume that the A model and the B model are produced, the total man-hour of the A model is 5100 seconds, and the total man-hour of the B model is 8500 seconds.

If the A model is 100%, that is, 300 units are produced, and the B model is produced at 0%, the total man-hours is 5100 seconds to complete a line tact of 170 seconds per unit, so 30 processes are required at 5100/170. It is.
Also, if the B model is 100%, that is, 300 units are produced, and the A model is produced at 0%, the total man-hour is 8500 seconds to complete in a line tact of 170 seconds per machine. A process is required.

Next, a method for producing on each dedicated line will be described.
Also in this case, the total operation time per day is 50400 seconds, the planned production number is 300, the total man-hour for the A model is 5100 seconds, and the total man-hour for the B model is 8500 seconds.
For example, it is assumed that 220 A models and 80 B models are produced on dedicated lines.

The line tact for producing 220 A models is approximately 230 seconds at 50400/220. In this case, since the total man-hour is 5100 seconds to complete the model A with a line tact of 230 seconds per machine, 23 processes are required at 5100/230.
In addition, the line tact for producing 80 B models is 630 seconds at 50400/80. In this case, in order to finish the model B with a line tact of 630 seconds per unit, the total man-hour is 8500 seconds, so 14 steps are required at 8500/630.

JP-A-6-35536

However, the method of mixed flow production on the same line always requires workers, that is, personnel with the maximum number of processes. In the above example, the number of processes required for 100% production of the A model is 30, and the number of processes required for 100% production of the B model is 50. Therefore, the maximum number of processes is 50. is there.
Therefore, even if 65% of the A model is produced and 35% of the B model is produced, the worker of the 50 steps is secured as personnel, so that an operator to whom work is not assigned appears.

  However, there is also a merit that among the equipment used for the production of the A model and the equipment used for the production of the B model, the equipment used for both the A model and the B model can be shared.

  On the other hand, in the method of producing on the dedicated line, the equipment used for the production of the A model and the production of the B model cannot be shared. Therefore, the same equipment is used for the A model and the B model. It is necessary to line up and invest twice.

  However, there is also an advantage that the line can be operated with the optimum number of workers corresponding to the man-hours of the A model and the B model. In the above example, the number of processes required for the production of the A model is 23, and the number of processes necessary for the production of the B model is 14, so that it can be produced by workers of 37 processes, that is, personnel.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a mixed flow production line having the advantages of both the same line mixed flow production and the dedicated line production.

The mixed flow production line of the present invention includes a plurality of production facilities shared by at least two types of work for works having different production numbers , a work area of a worker who performs work on the work for each model, the production equipment, and the work A self-propelled conveyance cart that conveys workpieces to and from the area, and a line for producing mixed-flow workpieces of each model, by setting the travel path of the self-propelled conveyance cart for each model, A dedicated line for each model including the production facility and the work area is configured, and a process for each model between the production facilities is assigned to the work area, and the line tact is determined according to the deviation in the number of production between the models. The work area of the dedicated line of a longer model is assigned more man-hours than the work area of the dedicated line of a model with a shorter line tact, In the dedicated line of a model with a longer line tact according to the deviation in the number of production between species, the work area process upstream of the specific production facility and the work area process downstream are the same work assigned characterized Rukoto to person.

  Moreover, it is preferable that the work area on the upstream side of the specific production facility and the work area on the downstream side are arranged at substantially the same place.

  According to the present invention, by sharing the production equipment for the work of each model, it is possible to minimize the capital investment by avoiding multiple investment, and by providing a dedicated line for each model, the optimum number of workers Can operate each dedicated line.

1 is a schematic plan view showing a first embodiment of a mixed flow production line according to the present invention. It is a schematic plan view which shows 2nd Embodiment of the mixed flow production line by this invention. It is a schematic plan view which shows 3rd Embodiment of the mixed flow production line by this invention. It is a schematic plan view of the principal part which shows 4th Embodiment of the mixed flow production line by this invention. It is a schematic plan view of the principal part which shows 5th Embodiment of the mixed flow production line by this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic plan view showing a first embodiment of a mixed flow production line according to the present invention.
This mixed flow production line 1 includes a production facility 10, a work area 21 of an operator 20, and a self-propelled conveyance carriage 30, and performs mixed flow production of at least two types of workpieces, for example, A type and B type. . The mixed flow production line 1 includes a dedicated line 31A for model A and a dedicated line 31B for model B.

  The production facility 10 is a facility shared for work on workpieces of the A model and the B model. In FIG. 1, four production facilities 10k, 10l, 10m, and 10n are illustrated. These production facilities 10k, 10l, 10m, and 10n are all used for the production of the A model and the production of the B model.

  The work area 21 is an area where the worker 20 performs work on a work for each model. In FIG. 1, work areas 21Ak, 21Al, 21Am for the A model and work areas 21Bk, 21B1, 21Bm for the B model are shown.

  The self-propelled conveyance cart 30 is an unmanned conveyance cart that conveys a workpiece between the production facility 10 and the work area 21. In FIG. 1, only one self-propelled conveyance cart 30 is shown. However, in practice, the required number of self-propelled transport carts 30 travel on a predetermined travel route according to a travel mode such as predetermined start and stop timings.

The dedicated line 31A for the A model is an independent line including the common facilities 10k, 10l, 10m, and 10n.
The dedicated line 31B for the B model is an independent line including the common facilities 10k, 10l, 10m, and 10n.
In other words, the dedicated line 31A for the A model and the dedicated line 31B for the B model share only the facilities 10k, 10l, 10m, and 10n, but are completely different independent dedicated lines.

  In the case of the exclusive line 31A for the A model, by setting the traveling path of the self-propelled conveyance carriage 30 that connects the common facilities 10k, 10l, 10m, and 10n and the work areas 21Ak, 21Al, and 21Am for the A model, , 10l, 10m, 10n and A-type dedicated line 31A including work areas 21Ak, 21Al, 21Am for A-type.

Therefore, a traveling path 31Ak1 of the self-propelled transport carriage 30 is set from the facility 10k to the work area 21Ak between the most upstream equipment 10k and the work area 21Ak on the downstream side in FIG. .
A travel path 31Ak2 of the self-propelled transport cart 30 is set from the work area 21Ak to the equipment 10l between the work area 21Ak and the equipment 10l on the downstream side.

A travel path 31Al1 of the self-propelled transport carriage 30 is set between the equipment 10l and the work area 21Al downstream thereof from the equipment 10l to the work area 21Al.
A travel path 31Al2 of the self-propelled conveyance carriage 30 is set between the work area 21Al and the equipment 10m downstream from the work area 21Al toward the equipment 10m.

A travel path 31Am1 of the self-propelled transport carriage 30 is set between the facility 10m and the work area 21Am downstream from the facility 10m toward the work area 21Am.
A travel path 31Am2 of the self-propelled transport carriage 30 is set from the work area 21Am to the equipment 10n between the work area 21Am and the equipment 10n downstream thereof.

  In the case of the dedicated line 31B for the B model, the shared equipment 10k is set by setting the traveling path of the self-propelled conveyance carriage 30 connecting the common facilities 10k, 10l, 10m, and 10n and the work areas 21Bk, 21Bl, and 21Bm for the B model. , 10l, 10m, 10n, and B model dedicated line 31B including B model work areas 21Bk, 21Bl, 21Bm.

Therefore, a travel path 31Bk1 of the self-propelled transport carriage 30 is set from the equipment 10k to the work area 21Bk between the equipment 10k on the most upstream side in FIG. 1 and the work area 21Bk on the downstream side. .
A travel path 31Bk2 of the self-propelled transport carriage 30 is set from the work area 21Bk to the equipment 10l between the work area 21Bk and the equipment 10l downstream of the work area 21Bk.

A travel path 31B11 of the self-propelled transport carriage 30 is set between the equipment 10l and the work area 21Bl downstream from the equipment 10l toward the work area 21Bl.
A travel path 31B12 of the self-propelled transport carriage 30 is set from the work area 21Bl to the equipment 10m between the work area 21Bl and the equipment 10m downstream thereof.

A traveling path 31Bm1 of the self-propelled conveyance carriage 30 is set between the facility 10m and the work area 21Bm on the downstream side from the facility 10m toward the work area 21Bm.
A travel path 31Bm2 of the self-propelled transport carriage 30 is set from the work area 21Bm to the equipment 10n between the work area 21Bm and the equipment 10n downstream thereof.

In the mixed flow production line 1, the dedicated line 31A for the A model and the dedicated line 31B for the B model can be laid out freely.
The terms “upstream side” and “downstream side” used in the above description are based on the flow of work processes for workpieces of model A or model B, and do not necessarily mean positions.

For example, the positions of the facilities 10k, 10l, 10m, and 10n can be freely laid out.
By freely laying out the positions of the work areas 21Ak, 21Al, and 21Am for the facilities 10k, 10l, 10m, and 10n, the dedicated line 31A for the A model can be laid out freely.
Further, by laying out the positions of the work areas 21Bk, 21Bl, and 21Bm with respect to the facilities 10k, 10l, 10m, and 10n, the dedicated line 31B for the B model can be laid out freely.

Therefore, the mixed flow production line 1 can achieve effective use of space.
Further, by devising the traveling path of the self-propelled conveyance cart 30, the workpiece conveyance time and conveyance distance can be shortened.
Furthermore, by using a part of the total number of the self-propelled transport carts 30 as a buffer as required, it is possible to more smoothly realize the work transport as a whole.

  In the mixed flow production line 1 as described above, it is assumed that the ratio of the number of A model produced to the number of B model produced is, for example, approximately 3: 1. If the line tact of the A model is 200 seconds, for example, the line tact of the B model is about 600 seconds.

In this case, if the number of process steps in the work area 21Ak for the A model is 200 seconds, the process organization rate in the work area 21Ak is 100%.
That is, the number of process steps can be assigned to the work area 21Ak so that the process organization rate of the worker 20Ak approaches 100%.

  Similarly, if the man-hours of the processes in the work areas 21Al and 21Am of the A model are respectively 200 seconds, the process organization rate in the work areas 21Al and 21Am is 100%. Man-hours for the processes can be allocated to the work areas 21Al and 21Am so that the process organization rates of the workers 20Al and 20Am approach 100%, respectively.

On the other hand, the line tact for the B model is about three times the line tact for the A model. Therefore, compared with the man-hour which A type worker 20Ak works, B type worker 20Bk has the margin which can work about 3 times as many man-hours.
Similarly, the B model workers 20Bl and 20Bm can afford to work about three times as many times as the A model workers 20Al and 20Am.
Therefore, it is possible to assign approximately three times as many man-hours to the B model workers 20Bk, 20Bl, and 20Bm as compared to the A model workers 20Ak, 20Al, and 20Am.

  Here, it is assumed that the total man-hour for the B model is about three times the total man-hour for the A model. That is, it is assumed that the man-hours for the processes in the work areas 21Ak, 21Al, and 21Am for the A model are 200 seconds, respectively, and the man-hours for the processes in the work areas 21Bk, 21Bl, and 21Bm for the B model are 600 seconds, respectively.

In this case, since the line tact of the B model is 600 seconds, the process organization rate in the work areas 21Bk, 21Bl, and 21Bm is 100%.
That is, the process man-hours can be allocated to the work areas 21Bk, 21Bl, and 21Bm so that the process organization rates of the workers 20Bk, 20Bl, and 20Bm approach 100%, respectively.

Next, it is assumed that the total man-hour for the B model is about twice that of the A model. That is, it is assumed that the process man-hours in the work areas 21Ak, 21Al, and 21Am of the A model are 200 seconds, respectively, and the man-hours of the processes in the work areas 21Bk, 21Bl, and 21Bm of the B model are 400 seconds, respectively.
In this case, since the line tact of the B model is 600 seconds, the process organization rate in the work areas 21Bk, 21Bl, and 21Bm is about 67%.

Here, for example, when the process in the work area 21Bl can be divided into two, the mixed flow production line 2 shown in FIG. 2 can be adopted instead of the mixed flow production line 1 shown in FIG.
FIG. 2 is a schematic plan view showing a second embodiment of the mixed flow production line according to the present invention.

The mixed flow production line 2 shown in FIG. 2 is obtained by dividing the process in the work area 21Bl into two, and is illustrated as work areas 21B11 and 21Bl2 divided into two.
Therefore, the mixed flow production line 2 is self-propelled so that the man-hours of the process in the work area 21B11 can be substantially worked in the work area 21Bk and the man-hours of the process in the work area 21B2 can be substantially worked in the work area 21Bm. The travel path of the transport carriage 30 is set.

Specifically, the work area 21B11 is arranged adjacent to the work area 21Bk. Then, a travel path 31B11 of the self-propelled transport carriage 30 is set from the equipment 10l toward the work area 21B11.
Thereby, the worker 20Bk can work without moving substantially between the work area 21Bk and the work area 21B11.

Further, the work area 21B12 is arranged adjacent to the work area 21Bm. Then, a travel path 31Bl3 of the self-propelled transport carriage 30 is set from the work area 21Bl1 to the work area 21Bl2. A travel path 31B12 of the self-propelled transport carriage 30 is set from the work area 21B12 toward the facility 10m.
Accordingly, the worker 20Bm can work without substantially moving between the work area 21Bm and the work area 21B12.

In the mixed flow production line 2 described above, the worker 20Bk is assigned the man-hour of the process in the work area 21B11 in addition to the man-hour of the process in the work area 21Bk.
Here, since the man-hour of the process in the work area 21Bk is 400 seconds and the man-hour of the process in the work area 21B11 is half of 200 seconds, the man-hour of 600 seconds is assigned to the worker 20Bk.
Since the line tact of the B model is 600 seconds, the process organization rate of the worker 20Bk is almost 100%.

In addition to the process man-hours in the work area 21Bm, the worker man-hours in the work area 21B12 are assigned to the worker 20Bm.
Here, since the man-hour for the process in the work area 21Bm is 400 seconds and the man-hour for the process in the work area 21B12 is half, which is 200 seconds, the man-hour of 600 seconds is assigned to the worker 20Bm.
Since the line tact of the B model is 600 seconds, the process organization rate of the worker 20Bm is almost 100%.

That is, the process man-hours can be allocated to the work areas 21Bk, 21Bl1, 21Bl2, and 21Bm so that the process organization rates of the workers 20Bk and 20Bm are almost 100%, respectively.
As a result, the worker 20B1 in the work area 21B1 becomes unnecessary.
Therefore, it is possible to reduce the surplus worker 20B1 based on the difference between the number of production of the A model and the number of production of the B model, that is, the model deviation between the A model and the B model.

Next, it is assumed that there is no practical difference between the total man-hour for the A model and the total man-hour for the B model. That is, it is assumed that the process man-hours in the work areas 21Ak, 21Al, and 21Am of the A model are 200 seconds, respectively, and the man-hours of the processes in the work areas 21Bk, 21Bl, and 21Bm of the B model are 200 seconds, respectively.
In this case, since the line tact of the B model is 600 seconds, the process organization rate in the work areas 21Bk, 21Bl, and 21Bm is about 33%.

In this case, the mixed flow production line 3 shown in FIG. 3 can be employed instead of the mixed flow production line 1 shown in FIG.
FIG. 3 is a schematic plan view showing a third embodiment of the mixed flow production line according to the present invention.

  The mixed flow production line 3 shown in FIG. 3 is self-propelled so that the process man-hours in the work area 21Ak, the process man-hours in the work area 21Al, and the process man-hours in the work area 21Am can be worked at substantially the same place. The travel path of the transport carriage 30 is set.

Specifically, the work area 21Bl and the work area 21Bm are both disposed adjacent to the work area 21Bk. Then, traveling paths 31Bl1 and 31Bl2 are set in the work area 21Bl. In addition, traveling paths 31Bm1 and 31Bm2 are set in the work area 21Bm.
Thereby, the worker 20Bk can work without substantially moving between the work areas 21Bk, 21Bl, and 21Bm.

In the mixed-flow production line 3 described above, the worker 20Bk is assigned the process man-hours in the work area 21Bl and the process man-hours in the work area 21Bm in addition to the process man-hours in the work area 21Bk.
Here, the man-hour of the process in the work area 21Bk is 200 seconds, the man-hour of the process in the work area 21Bl is 200 seconds, and the man-hour of the process in the work area 21Bm is 200 seconds. Man-hours are assigned.
Since the line tact of the B model is 600 seconds, the process organization rate of the worker 20Bk is almost 100%.

In other words, the process man-hours can be assigned to the work areas 21Bk, 21Bl, and 21Bm so that the process organization rate of the worker 20Bk is almost 100%.
As a result, the worker 20B1 in the work area 21Bl and the worker 20Bm in the work area 21Bm are not required.
Therefore, it is possible to reduce surplus workers 20Bl and 20Bm based on the model deviation between the A model and the B model.

The reduction of surplus workers, that is, deviation personnel based on the model deviation can be expected to be significantly reduced as the model deviation increases. In other words, as the line tact of the longer dedicated line 31B for the B model is longer than the dedicated line 31A for the A model having a shorter line tact, the deviation personnel can be expected to be significantly reduced.
That is, regardless of the size of the model deviation, it is possible to surely reduce the number of surplus workers and minimize the number of deviation personnel.

  Further, from the viewpoint of controlling the self-propelled conveyance cart 30, the traveling speed of the self-propelled conveyance cart 30 in the A-type dedicated line 31A having a shorter line tact and the B-type dedicated line 31B having a longer line tact. The traveling speed of the self-propelled transport carriage 30 is preferably the same speed.

However, the traveling speed of the self-propelled transport cart 30 can be freely changed. In order to finish all the man-hours with the determined line tact, the self-propelled conveyance carriage 30 can arbitrarily set the traveling speed if necessary.
For example, compared with the traveling speed of the self-propelled conveyance carriage 30 in the dedicated line 31B of the B model having a longer line tact, the traveling speed of the self-propelled conveyance truck 30 in the exclusive line 31A of the A model having a shorter line tact is It is also possible to set faster.

FIG. 4 is a schematic plan view of an essential part showing a fourth embodiment of the mixed flow production line according to the present invention.
This mixed flow production line 4 is additionally combined with the mixed flow production lines 1, 2 and 3 shown in FIGS. 1, 2 and 3, and is used for both the A model dedicated line 31A and the B model dedicated line 31B. It is possible to add. Therefore, it is represented as one dedicated line 31.
For simplification of description, FIG. 4 shows three production facilities 10k, 10l, and 10m, two work areas 21k and 21l, and one self-propelled conveyance carriage 30.

As for the self-propelled conveyance trolley | bogie 30, the conveyance direction is not decided like a conveyor. Therefore, by setting the travel path in advance, it is possible to travel in any direction along the travel path and transport the workpiece.
That is, the self-propelled conveyance carriage 30 can convey not only the workpiece from the upstream side to the downstream side but also the downstream side to the upstream side as necessary.
Further, the self-propelled conveyance cart 30 can pass an arbitrary facility or work area and convey the workpiece to the upstream side or the downstream side thereof.

In the mixed flow production line 4, the line tact is assumed to be 500 seconds, for example. That is, the cycle time of each equipment 10k, 10l, 10m is 500 seconds.
Further, it is assumed that the number of process steps in the work area 21k between the facilities 10k and 10l is, for example, 400 seconds.
Further, it is assumed that the number of process steps in the work area 21l between the facilities 10l and 10m is, for example, 600 seconds.

In this case, the travel path of the self-propelled transport cart 30 is set as follows.
That is, the traveling path 31k1 is set from the equipment 10k to the work area 21k between the equipment 10k on the most upstream side in FIG. 4 and the work area 21k on the downstream side.

A travel path 31k2 is set from the work area 21k to the equipment 10l between the work area 21k and the equipment 101 downstream of the work area 21k.
In addition, a traveling path 31l1 is set from the equipment 10l toward the work area 21k. This traveling path 31l1 returns the self-propelled transport cart 30 starting from the facility 10l to the work area 21k.

Between the work area 21k and the work area 21l on the downstream side of the equipment 10l, a traveling path 31l2 is set from the work area 21k through the equipment 10l to the work area 21l.
A travel path 31l3 is set from the work area 21l to the equipment 10m between the work area 21l and the equipment 10m downstream thereof.

  In the case of this mixed flow production line 4, the man-hour of the process in the work area 21k is 400 seconds with respect to a line tact of 500 seconds. Therefore, the process organization rate in the work area 21k is initially 80%. That is, the worker 20k works for 400 seconds.

The work for which the work for 400 seconds in the work area 21k has been completed is transported to the equipment 10l by the self-propelled transport cart 30, and the man-hours of a predetermined process are worked.
After the work in the facility 10l is finished, the work is transferred again to the work area 21k by the self-propelled transfer carriage 30.

Therefore, the worker 20k can work the man-hours for the remaining 100 seconds with respect to the line tact of 500 seconds. The man-hour for 100 seconds can be obtained from the man-hour for 600 seconds of the process in the work area 21l.
Thereby, the process organization rate of the worker 20k finally rises to 100% full of line tact.

  The work for which the work for the line tact 500 seconds in the work area 21k has been completed is transported to the work area 21l by the self-propelled transport carriage 30 without passing through the equipment 10l.

The process in the work area 21l has a man-hour of 600 seconds for a line tact of 500 seconds. However, since the man-hour for 100 seconds has already been worked by the worker 20k in the work area 21k, the man-hour for 500 seconds remains.
The man-hour for 500 seconds is a man-hour that can be worked by one worker 20l. Therefore, the worker 20l performs the man-hour of 500 seconds. Therefore, the process organization rate of the worker 20l becomes 100% of the full line tact.

Thus, in the case of the mixed flow production line 4, only two workers, 20k and 20l, are required. And the process organization rate of each worker 20k, 20l will be 100%.
On the other hand, if the traveling path of the self-propelled transport carriage 30 as described above is not set, three workers are required for 20k and two 20l.

Therefore, in the case of the mixed flow production line 4, by adjusting the traveling path of the self-propelled transport carriage 30, the process man-hours in the work area 21k and the process man-hours in the work area 21l are adjusted beyond the equipment 10l. can do.
As a result, workers are not disposed wastefully, and work efficiency in the work areas 21k and 21l can be improved.

FIG. 5 is a schematic plan view of an essential part showing a fifth embodiment of the mixed flow production line according to the present invention.
This mixed flow production line 5 is additionally combined with the mixed flow production lines 1, 2 and 3 shown in FIGS. 1, 2 and 3, except for the travel path of the self-propelled transport carriage 30 in FIG. It is the same as the mixed flow production line 4 shown.

  In the mixed flow production line 5, it is assumed that the line tact is 500 seconds, the process time in the work area 21k is 600 seconds, and the process time in the work area 21l is 400 seconds, for example.

In this case, the travel path of the self-propelled transport cart 30 is set as follows.
That is, a traveling path 31k2 is set between the work area 21k and the work area 21l further downstream of the equipment 10l downstream from the work area 21k through the equipment 10l toward the work area 21l. . This traveling path 31k2 guides the self-propelled transport carriage 30 starting from the work area 21k to the work area 21l through the equipment 10l.

A travel path 31k3 is set from the work area 21l to the equipment 10l between the work area 21l and the equipment 10l upstream of the work area 21l. This traveling path 31k3 returns the self-propelled transport carriage 30 starting from the work area 21l to the facility 10l.
In addition, a traveling path 31l1 is set from the facility 10l toward the work area 21l.

  In the case of the mixed flow production line 5, the process in the work area 21k has a man-hour of 600 seconds for a line tact of 500 seconds. Therefore, the worker 20k works for the man-hour of 500 seconds. Therefore, the process organization rate of this worker 20k is 100% of the full line tact.

The work for which the work man-hours for 500 seconds have been completed in the work area 21k is transferred to the work area 21l by the self-propelled conveyance carriage 30 through the equipment 10l.
Therefore, the worker 20l can work for the remaining 100 seconds of the process in the work area 21k.
Thereby, all the man-hours for 600 seconds of the process in the work area 21k are completed.

Subsequently, the work is transported to the equipment 10l by the self-propelled transport cart 30, and the man-hours of the predetermined process are worked.
After the work in the equipment 10l is completed, the work is transferred again to the work area 21l by the self-propelled transfer carriage 30.

The process in the work area 21l has only a man-hour of 400 seconds for a line tact of 500 seconds. However, the worker 201 has already worked for the man-hour for 100 seconds in the process in the work area 21k.
In addition to this, the worker 20l works for 400 seconds of the process in the work area 21l. Therefore, the process organization rate of the worker 20l becomes 100% of the full line tact.

As described above, in the mixed flow production line 5, as in the case of the mixed flow production line 4 shown in FIG. 4, two workers of 20k and 20l are sufficient. Further, the process organization rate of each worker 20k, 20l is 100%. Furthermore, the process man-hours in the work area 21k and the process man-hours in the work area 21l can be adjusted beyond the equipment 10l.
As a result, it is possible to prevent the worker from being wasted and improve work efficiency.

  In addition, the mixed flow production lines 1, 2, and 3 of the embodiment shown in FIGS. 1, 2, and 3 include four production facilities 10k, 10l, 10m, and 10n, and the embodiments shown in FIGS. The mixed flow production lines 4 and 5 have been described as including three production facilities 10k, 10l, and 10m, but the present invention is not limited to this. For any of the mixed flow production lines 1, 2, 3, 4, and 5, it is possible to provide one or more production facilities 10.

  Moreover, although said embodiment demonstrated as a mixed flow production line provided with the production equipment 10, this invention is not limited to this. For example, the present invention can also be applied to a mixed flow assembly line including an assembly facility instead of a production facility, or a mixed flow production line including a production apparatus instead of a production facility.

1, 2, 3, 4, 5 Mixed production line 10 Production facilities (shared facilities)
20 worker 21 work area 30 self-propelled conveyance cart (automatic conveyance cart)
31A, 31B dedicated line

Claims (2)

A plurality of production facilities shared for work on at least two types of workpieces with different production numbers;
Work area for workers who work on workpieces by model,
A self-propelled transport cart that transports workpieces between the production facility and the work area;
A line for producing a mixed flow of the workpieces of each model,
By setting the traveling path of the self-propelled transport cart for each model, a dedicated line for each model including the production facility and the work area is configured,
The work area is assigned a machine-specific process between the production facilities,
Depending on the deviation in the number of production between the models, the work area of the dedicated line for models with a longer line tact is allocated more man-hours than the work area of the dedicated line for models with a shorter line tact. And
In the dedicated line of a model with a longer line tact according to the deviation in the number of production between the models, the process of the work area upstream of the specific production facility and the process of the work area downstream are the same Mixed flow production line characterized by being assigned to workers. In the mixed flow production line according to claim 1 ,
The mixed flow production line, wherein the work area upstream of the specific production facility and the work area downstream are arranged at substantially the same place.

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