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Method for controlling hole group composite position degree error through optimizing clamp layout

A technology of compound position and control hole, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the control of compound position error, fails to consider the influence of the compound position error of the fixture hole group, and does not give Layout and other issues to achieve the effect of reducing the impact

Active Publication Date: 2015-04-22
TIANJIN UNIV
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Problems solved by technology

However, this analysis does not discuss the optimal design criteria for the fixture layout satisfying the force closure condition
[0005] The above documents and related technologies fail to consider the influence of the fixture on the composite position error of the hole group during the machining process, and do not give a method to control the composite position error through the layout of the fixture.

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  • Method for controlling hole group composite position degree error through optimizing clamp layout
  • Method for controlling hole group composite position degree error through optimizing clamp layout
  • Method for controlling hole group composite position degree error through optimizing clamp layout

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Embodiment Construction

[0026] In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below.

[0027] Hole group features such as figure 1 As shown, is a common feature in mechanical parts, and there is often a high requirement for the relative position accuracy of each hole in the hole group, and the position accuracy of the hole group features is affected by the fixture. The present invention reduces the compound position error of hole group feature processing by designing the positions of 6 positioning elements, and the steps are as follows:

[0028] Among them, the six-point positioning fixture is a type of fixture, such as figure 2 As shown in Fig. 1, a fixture that achieves accurate positioning by limiting the six degrees of freedom of the workpiece through six positioning elements in contact with the workpiece, such as figure 1 shown. The key factor determining...

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Abstract

The invention discloses a method for controlling the hole group composite position degree error through optimizing the clamp layout. The method includes the following steps that a relation model of geometric errors of clamp positioning elements, positioning element positions and the working position error is established; a relation model of milling force, clamping force, the positioning element positions and the workpiece position error is established; a minimal hole group feature composite position degree error is an objective function, the clamp positioning element positions are optimization variables, the optimal positioning element position is searched for through an optimization algorithm, and the hole group composite position degree error is minimal. The clamp design method is high in universality and simple.

Description

technical field [0001] The invention relates to the field of fixture design, in particular to a method for controlling the compound position error of hole groups by optimizing the layout of fixtures. Background technique [0002] Fixtures are an important part of process equipment. The workpiece has a definite position in the fixture, and it does not change with the influence of various factors in the process of processing or measurement. It is a technical requirement that the fixture must meet to ensure accurate positioning, stability and reliability. At present, scholars at home and abroad have done a lot of research work on the problem of fixture layout design. [0003] The positioning error of the fixture is the main factor leading to the position error of the workpiece. The positioning error of the fixture is mainly determined by the position error of the positioning element, the geometric error and the geometric error of the workpiece reference plane. Qin [1] estab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 何改云郭龙真丁伯慧王凯
Owner TIANJIN UNIV
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