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Method for determining time of tool changing based on dynamic reliability

A technology of tool change time and reliability, applied in the field of determining tool change time and determining tool change time based on dynamic reliability

Active Publication Date: 2015-11-11
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, scholars at home and abroad mostly study how to carry out reasonable mechanical scheduling and planning to achieve the purpose of reducing working hours, but do not consider the reliability of the tool as an important factor affecting the tool change time and machining process
In addition, due to the influence of mechanical vibration, texture distribution of processed materials and other factors, the cutting parameters change randomly, which is closer to the real working conditions as a random variable, but the degree of influence of cutting parameters on tool reliability is reliability The impact on sensitivity and tool change time and overall process reliability has not been reported

Method used

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  • Method for determining time of tool changing based on dynamic reliability
  • Method for determining time of tool changing based on dynamic reliability
  • Method for determining time of tool changing based on dynamic reliability

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Embodiment Construction

[0052] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0053] The method for determining the tool change time based on the dynamic reliability of the present invention is specifically implemented according to the following steps:

[0054] Step 1, establish the dynamic reliability model of the whole process flow

[0055] When processing parts, the machine tool, operator, and tool form a series system and are independent of each other, then the reliability of the entire process flow is expressed as:

[0056] R b (t)=R m (t)×R o (t)×R t (t)(1)

[0057] In the formula, R b (t), R m (t), R o (t), R t (t) represent the reliability of the overall process, machine tool, operator and tool respectively;

[0058] Assuming that when the machine tool is processing a batch of parts, the machine tool itself and the operator do not fail, that is, R m (t)=R o (t)=1, then there is

[0059] R b ...

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Abstract

The invention discloses a method for determining time of tool changing based on dynamic reliability. The method comprises the following steps: firstly, building a dynamic reliability model of the whole process flow; then, calculating the reliability of a tool according to the built model, comparing the reliability of the tool with an allowable reliability value, and determining the time of tool changing. As the method builds the dynamic reliability model of the whole process flow, the calculation formula of failure rate of the tool in each procedure is derived, the replaced tool is determined by taking the failure rate of the tool as a criterion, finally the maximum application of the tool is realized, and the cost is saved.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and relates to a method for determining tool change time, in particular to a method for determining tool change time based on dynamic reliability. Background technique [0002] In modern society, high-precision automation technology has been widely used, and the machinery industry has put forward higher requirements for the reliability of the entire process of the product. It is closely related to the reliability of machine tools, operators, and tools. Therefore, it is necessary to study the reliability and sensitivity of tools. very important. If the reliability of the tool is poor, it will cause frequent tool changes, increase the product failure rate, and consume more man-hours and economic costs. [0003] Ramalingam and Watson conducted research on the reliability of cutting tools, and established a probability model to determine the durability of cutting tools. K.-S.Wang et a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23Q3/155
CPCB23Q3/155
Inventor 王新刚赵玉倩王宝艳
Owner NORTHEASTERN UNIV
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