JP2002169861A - Inventory management system and inventory management system program - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an inventory management system for appropriately managing inventory. SOLUTION: An inventory model 1 is created from a reference inventory amount 11, a sales speed 12, and a safety inventory 13, and a simulation 2 is performed based on the inventory model 1 by using a sales forecasting model 14 and equipment constraint conditions 15.
Based on the results of the above, the stock standard, the delivery date compliance rate and the stock quantity are determined 3 and an inventory plan 4 and a plan 5 for the daily production instruction quantity are drafted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an inventory management system and an inventory management system program.

[0002]

2. Description of the Related Art One electronic component has various specifications such as a size, a resistance value, and a capacity, and a variety of electronic components according to the various specifications are produced. In the production of electronic components of various specifications, since the type switching time is long, the production has been performed in consideration of production efficiency.

[0003]

At this time, if the production volume of the batch production increases, the production interval also becomes longer, and it becomes impossible to produce electronic parts of a required type when required, resulting in excess inventory, Alternatively, there is a problem that electronic parts of a required type are insufficient.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide an inventory management system for appropriately managing the amount of inventory.

[0005]

To achieve the above object, the present invention has the following arrangement.

According to a first aspect of the present invention, an inventory model is created from a reference inventory amount, a sales speed, and a safety inventory, and a simulation is performed using a sales forecasting model and equipment constraint conditions based on the inventory model. Based on the results of this simulation, the inventory standard, delivery date compliance rate and inventory amount are determined, and an inventory plan and a daily production instruction amount plan are made. This has the effect that the inventory amount can be properly managed. Have.

According to a second aspect of the present invention, in particular, the safety stock amount is determined based on a prediction error calculated by a demand forecasting model. This has the effect that the stock amount that can be supplied can be secured.

In the invention according to claim 3, in particular, the production instruction amount is (total production time in the line × average switching time) / (daily working time−average tact time × day production schedule). Number).

In the invention according to claim 4, in particular, an inventory model is created from a reference inventory amount, a sales speed, and a safety inventory, and a simulation is performed using a sales forecasting model and equipment constraint conditions based on the inventory model. Based on the results of this simulation, the inventory standard, the on-time delivery rate and the inventory amount are determined, and an inventory plan and a daily production instruction amount plan are drafted, so that the inventory amount can be properly managed. Having.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an inventory management system according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a system chart of an inventory management system according to an embodiment of the present invention.

In the figure, an inventory model 1 is created from a reference inventory amount 11, a sales speed 12, and a safety inventory 13. Based on the inventory model 1, a simulation 2 is performed using a sales prediction model 14 and equipment constraint conditions 15. Based on the result of this simulation 2, inventory standard,
The delivery date compliance rate and stock quantity determination 3 are performed, and a stock plan 4 and a daily production quantity plan 5 are made.

[0013] Regarding the above inventory management system,
The detailed inventory management method will be described below.

First, as shown in FIG.
It is created from the relationship between the reference stock, sales speed, production instruction point, and safety stock. At this time, the reference stock amount is
The production instruction quantity and the safety stock quantity are added, and the safety stock quantity is the stock quantity by the prediction error calculated from the order data from the past and the manufacturing lead time, and the production instruction quantity is the number of types switching and equipment processing capacity And "the total number of products to be produced on the production line * the average type switching time" / (the working time per day-the average tact time * the planned number of productions per day). Sales speed is the rate at which inventory is sold and reduced on a daily basis from the base inventory.
This is the actual inventory amount. Also, the production instruction point is
This is calculated by (average sales speed * manufacturing lead time + safety stock amount), and when the production amount falls below the production instruction amount, the production instruction is issued so that the inventory amount becomes the reference inventory amount.

Next, using a sales forecasting model and actual equipment constraint conditions as an inventory model, it is determined whether the production capacity can cope with the order quantity even if the actual order quantity varies, and the determined delivery date. It simulates whether it is possible to comply, and obtains a simulation result of the delivery date compliance rate, inventory amount, and production instruction amount of whether or not the delivery date specified when receiving the order is being observed. Here, the equipment constraint condition is a condition calculated from the production capacity in the production line, the number of types of switching, and the manufacturing lead time. The sales forecast model is a trend-oriented model based on the sales volume of the past 12 months, an intermediate model based on the sales volume of the past 12 months and the forecasted sales volume, a future model based on the confirmed order quantity and the forecast sales volume, and the sales volume of the past 12 months. It is obtained by multiplying each of the differential types based on the estimated sales quantity and the estimated sales quantity by a weighting coefficient.

Finally, as shown in FIG. 3, based on the obtained simulation results, the inventory standard indicating how many days the inventory should be kept is compared with the delivery date compliance rate and the inventory amount.
An inventory standard with the highest delivery date compliance ratio and the minimum inventory amount is obtained, and this inventory standard is used as a standard inventory amount of an inventory model to plan an inventory plan and a daily production instruction amount.

[0017]

As described above, the present invention has an effect that it is possible to provide an inventory management system for appropriately managing the inventory amount.

[Brief description of the drawings]

FIG. 1 is a system chart of an inventory management system according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating the stock model.

FIG. 3 is a diagram for explaining the simulation result.

[Explanation of symbols]

 1 Inventory Model 2 Simulation 3 Judgment of Inventory Standard / Delivery Time Compliance / Inventory Quantity 4 Inventory Planning 5 Planning of Production Order Quantity Every Day 11 Standard Inventory Quantity 12 Sales Speed 13 Safety Stock 14 Sales Forecast Model 15 Equipment Constraints

Continued on the front page (72) Inventor Miho Kurahashi 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 3C100 AA05 AA45 BB14 BB36 EE08

Claims (4)

[Claims] An inventory model is created from a reference inventory amount, a sales speed and a safety inventory, a simulation is performed using a sales forecasting model and equipment constraint conditions based on the inventory model, and an inventory standard is created based on a result of the simulation. , An inventory management system that determines the on-time delivery rate and the amount of inventory, and formulates an inventory plan and a daily production instruction amount plan. 2. The inventory management system according to claim 1, wherein the safety stock amount is determined based on a prediction error calculated by a demand prediction model. 3. The inventory according to claim 1, wherein the production instruction amount is (total number of products produced in the line × average switching time) / (working time per day−average tact time × planned number of productions per day). Management system. 4. An inventory model is created from a reference inventory amount, a sales speed, and a safety inventory, a simulation is performed using a sales forecasting model and equipment constraint conditions based on the inventory model, and an inventory standard is created based on a result of the simulation. An inventory management system program that determines the on-time delivery rate and the amount of inventory, and plans an inventory plan and a daily production instruction amount.