Analysis Method of NC Machine Tool System Component Replacement Time Based on Time Correlation

A technology of numerical control machine tools and replacement time, which is applied in the fields of electrical digital data processing, computer-aided design, special data processing applications, etc., and can solve problems such as calculation deviation of component spare parts inventory

Inactive Publication Date: 2018-01-30
JILIN UNIV
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Problems solved by technology

[0005] Aiming at the defects of the existing technology that the component replacement time model and component spare parts inventory calculation have deviations due to the establishment of a reliability model that ignores the impact of system component failure time

Method used

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  • Analysis Method of NC Machine Tool System Component Replacement Time Based on Time Correlation
  • Analysis Method of NC Machine Tool System Component Replacement Time Based on Time Correlation
  • Analysis Method of NC Machine Tool System Component Replacement Time Based on Time Correlation

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Experimental program
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Effect test

Embodiment

[0093] Analysis of replacement time of CNC machine tool system components

[0094] The fault analysis was carried out on 110 fault data of a certain CNC machine tool field collected from 14 sets, and it was found that a total of five components were faulty.

[0095]Table 1 CNC machine tool system component fault information (h)

[0096]

[0097] Due to the lack of fault information of the D and E components, only the replacement time of the A, B, and C components is studied.

[0098] According to the data in Table 1, the time between failures is calculated, and the three-component stationarity test parameters are shown in Table 2. Take the A component as an example, and calculate the number of runs γ=15, N 1 =10, N 2 = 26, calculated mean E γ = 15.4, D γ =5.55, Z=-0.189, because |Z|<1.96, so the fault data series is considered to be stationary. Similarly, it can be determined that the B and C fault data series are stationary.

[0099] Table 2 Three-component stationa...

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Abstract

The invention belongs to the technical field of reliability analysis of a numerical control machine tool, relates to a time correlation based replacement time calculation method for numerical control machine tool components and overcomes the defect that a component replacement time model and spare component inventory calculation have deviation due to the fact that a reliability model is established with ignorance of related effects of system component failure time in the prior art. The method comprises steps as follows: 1, acquiring failure data; 2, detecting stability of the failure data with a run-length testing method; 3, correcting a failure sequence number of failure time ti of each component with a Johnson method; 4, modeling a failure process of each numerical control machine tool component; 5, calculating a replacement failure rate index lambda'R; 6, calculating the replacement life of each component in a numerical control machine tool system and the spare component inventory in a certain period of time. According to the method, the component replacement time can be calculated, the spare component inventory in a certain period can be predicted, basis is provided for purchasing management of an enterprise, the inventory loss of the enterprise is reduced, and the economic benefit is increased.

Description

technical field [0001] The invention belongs to the technical field of reliability analysis of numerically controlled machine tools, and relates to a time-dependent numerically controlled machine tool system component replacement time analysis method. Background technique [0002] CNC machine tool is a complex repairable system that integrates mechanics, electricity, hydraulics, gas and light. "Relationship" is a common feature of its failures. At the same time, due to the influence of maintenance, there may be a certain trend in its failure process. The failure process model is the basis for the formulation of equipment maintenance strategies and the estimation of spare parts inventory. Traditional CNC machine tool system component reliability modeling is mostly based on component failure information during machine tool operation, and is based on the assumption of failure independence. Based on this, there is a deviation in the establishment of the component failure proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/367G06F2119/04G06F2119/12
Inventor 申桂香龙哲张英芝曾文彬刘津彤赵忠原
Owner JILIN UNIV
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