A Method of Controlling the Composite Position Error of Hole Groups by Optimizing Fixture Layout

A technology of compound position degree and control hole, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of controlling compound position degree error, not discussing the optimal design criteria of fixture layout, and not giving layout, etc. achieve the effect of reducing the impact

Active Publication Date: 2017-08-15
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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  • A Method of Controlling the Composite Position Error of Hole Groups by Optimizing Fixture Layout
  • A Method of Controlling the Composite Position Error of Hole Groups by Optimizing Fixture Layout
  • A Method of Controlling the Composite Position Error of Hole Groups by Optimizing Fixture 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 composite position error of a hole group by optimizing the layout of a fixture. The method comprises the following steps: establishing a relationship model between the geometric error of the fixture positioning element, the position of the positioning element and the position error of the workpiece; establishing the milling force, The relationship model between the clamping force, the position of the positioning element and the position error of the workpiece; the objective function is to minimize the composite position error of the hole group feature, and the position of the fixture positioning element is the optimization variable. Combined compound position degree error is the smallest. The fixture design method has strong versatility and simple design method.

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 Patents(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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