METHOD AND SYSTEM OF MANAGING REPLACEMENT TIMING INTERVAL OF MAINTENANCE PART

• US 20150220875A1
• Filed: 06/13/2012
• Published: 08/06/2015
• Est. Priority Date: 06/13/2012
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Tamaki, Kenji, Tateishi, Jun
• Application Number:
  US14/406,268
• Publication Number:
  US 20150220875A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06Q 10/06 Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
• CPC Class Codes: G06Q 10/06313 Resource planning in a project environment
• CPC Class Codes: G06Q 10/087 Inventory or stock management, e.g. order filling, procurement or balancing against orders
• CPC Class Codes: G06Q 10/20 Administration of product repair or maintenance
• CPC Class Codes: G06Q 50/00 Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism healthcare informatics G16H

Abstract

In a maintenance-part replacement timing interval management system 100, a machine working time information collection unit 107, a maintenance-part supply history information collection unit 109, a machine-basis demand forecast unit 102, an area-basis demand forecast unit 103, a demand-supply gap calculation unit 104, a replacement timing interval update unit 105, etc. are provided, so that a demand forecast simulation is performed by collecting the working time of each of a plurality of machines worked in target areas where machine working conditions are similar to each other, by collecting an accumulated total number of the actual maintenance-part supply of a maintenance part for the target area, by calculating the past part replacement timing of each of the machines in the target area from the maintenance-part replacement timing interval for which a tentative value is previously determined and from the working time, and by counting an accumulated total number of past maintenance-part replacement demand of all the machines in time series, and a maintenance-part demand-supply gap value which is the difference between the time-series accumulated total number of maintenance-part replacement demand and the accumulated total number of maintenance-part supply is calculated, an optimum estimation value of the maintenance-part replacement timing interval which minimizes the maintenance-part demand-supply gap value is calculated while changing the tentative value of the maintenance-part replacement timing interval, and a future demand for the maintenance part is forecasted by using the optimum estimation value of the maintenance-part replacement timing interval.

Claims

1. A method of managing a replacement timing interval of a maintenance part that forecasts, by a management system using a calculator, a demand for a maintenance part of a machine having the maintenance part, which is periodically replaced due to time-dependent deterioration as a component, comprising the steps of:

a machine working-time information collection step of collecting working time of each of a plurality of machines worked in target areas where machine working conditions are similar to each other, and of memorizing the working time in a machine working-time information memory unit;

a maintenance-part supply history information collection step of collecting an accumulated total number of actual maintenance-part supply of the maintenance part to the target area, and of memorizing the accumulated total number in a maintenance-part supply history information memory unit;

a demand forecast simulation step of calculating past part replacement timing of each machine in the target area from a maintenance-part replacement timing interval for which a tentative value is previously determined and from the working time memorized in the machine working-time information memory unit, and of counting and outputting an accumulated total number of past maintenance-part replacement demand of all the machines in time series;

a maintenance-part demand-supply gap calculation step of calculating and outputting a maintenance-part demand-supply gap value which is a difference between the time-series accumulated total number of maintenance-part replacement demand output in the demand forecast simulation step and the accumulated total number of the maintenance-part supply memorized in the maintenance-part supply history information memory unit; and

a maintenance-part replacement timing interval update step of calculating and outputting an optimum estimation value of the maintenance-part replacement timing interval which minimizes the maintenance-part demand-supply gap value output in the maintenance-part demand-supply gap calculation step while changing the tentative value of the maintenance-part replacement timing interval,

wherein a future demand for the maintenance part is forecasted by using the optimum estimation value of the maintenance-part replacement timing interval output in the maintenance-part replacement timing interval update step.

2. The method of managing the replacement timing interval of the maintenance part according to claim 1,

wherein the maintenance-part replacement timing interval is an individual value for each machine,

in the demand forecast simulation step, the past part replacement timing for each machine is calculated by using the part replacement timing interval for each of the machines, and the accumulated total number of the past maintenance-part replacement demand of all the machines in the target area is counted and output in time series,

in the maintenance-part demand-supply gap calculation step, the maintenance-part demand-supply gap value which is the difference between the accumulated total number of demand of the maintenance-part replacement in the target area output in the demand forecast simulation step and the accumulated total number of supply of the maintenance part supplied to the target area memorized in the maintenance-part supply history information memory unit is calculated and output, and,

in the maintenance-part replacement timing interval update step, the optimum estimation value of the maintenance-part replacement timing interval of each of the machines which minimizes the maintenance-part demand-supply gap value output in the maintenance-part demand-supply gap calculation step is calculated and output.

3. The method of managing the replacement timing interval of the maintenance part according to claim 2,

wherein, in the maintenance-part replacement timing interval update step, when the optimum estimation value of the maintenance-part replacement timing interval of each of the machines which minimizes the maintenance-part demand-supply gap value output in the maintenance-part demand-supply gap calculation step is calculated, the optimum estimation value of the maintenance-part replacement interval having such a time-series counted value as zero or as being minimized by cancelling positive and negative of a value at each point of the maintenance-part demand-supply gap value in time series is calculated.

4. The method of managing the replacement timing interval of the maintenance part according to claim 1,

wherein the target areas where the machine working conditions are similar to each other are target areas sorted by a similar environment, target areas sorted by a similar intended use, or target areas sorted by a machine operating company.

5. A system of managing a replacement timing interval of a maintenance part that forecasts, by a management system using a calculator, a demand for a maintenance part of a machine having the maintenance part, which is periodically replaced due to time-dependent deterioration, as a component, comprising:

a machine working time information collection unit that collects working time of each of a plurality of machines worked in target areas where machine operation conditions are similar to each other, and memorizes the working time in a machine working time information memory unit;

a maintenance-part supply history information collection unit that collects an accumulated total number of actual maintenance-part supply of the maintenance part for the target area, and memorizes the accumulated total number in a maintenance-part supply history information memory unit;

a demand forecast simulator unit that calculates past part replacement timing of each machine in the target area from a maintenance-part replacement timing interval for which a tentative value is previously determined and from the working time memorized in the machine working time information memory unit, and counts and outputs an accumulated total number of the past maintenance-part replacement demand of all the machines in time series;

a maintenance-part demand-supply gap calculation unit that calculates and outputs a maintenance-part demand-supply gap value which is a difference between the time-series accumulated total number of maintenance-part replacement demand output from the demand forecast simulator unit and the accumulated total number of maintenance-part supply memorized in the maintenance-part supply history information memory unit; and

a maintenance-part replacement timing interval update unit that calculates and outputs an optimum estimation value of the maintenance-part replacement timing interval which minimizes the maintenance-part demand-supply gap value output from the maintenance-part demand-supply gap calculation unit while changing the tentative value of the maintenance-part replacement timing interval,

wherein a future demand for the maintenance part is forecasted by using the optimum estimation value of the maintenance-part replacement timing interval output from the maintenance-part replacement timing interval update unit.

6. The system of managing the replacement timing interval of the maintenance part according to claim 5,

wherein the maintenance-part replacement timing interval is an individual value for each machine,

the demand forecast simulator unit calculates the past part replacement timing for each machine by using the part replacement timing interval for each of the machines, and counts and outputs the accumulated total number of the past maintenance-part replacement demand of all the machines in the target area in time series,

the maintenance-part demand-supply gap calculation unit calculates and outputs the maintenance-part demand-supply gap value which is a difference between the accumulated total number of demand of the maintenance-part replacement in the target area output in the demand forecast simulator unit and the accumulated total number of supply of the maintenance part supplied to the target area memorized in the maintenance-part supply history information memory unit, and

the maintenance-part replacement timing interval update unit calculates and outputs the optimum estimation value of the maintenance-part replacement timing interval of each of the machines which minimizes the maintenance-part demand-supply gap value output from the maintenance-part demand-supply gap calculation unit.

7. The system of managing the replacement timing interval of the maintenance part according to claim 6,

wherein, when the optimum estimation value of the maintenance-part replacement timing interval of each of the machines which minimizes the maintenance-part demand-supply gap value output from the maintenance-part demand-supply gap calculation unit is calculated, the maintenance-part replacement timing interval update unit calculates the optimum estimation value of the maintenance-part replacement interval having such a time-series counted value as zero or as being minimized by cancelling positive and negative of a value at each point of the maintenance-part demand-supply gap value in time series.

8. The system of managing the replacement timing interval of the maintenance part according to claim 5,

wherein the target areas where the machine working conditions are similar to each other are target areas sorted by a similar environment, target areas sorted by a similar intended use, or target areas sorted by a machine operating company.