一种对中定位机构的设计及其优化分析

doi:10.16180/j.cnki.issn1007-7820.2021.01.003

摘要/Abstract

摘要：

显示器定位夹具是显示器装配生产线上的关键设备,对实现显示器自动化装配起到了重要作用。文中针对显示器定位夹具设计了一种关于曲柄滑块式的对中定位机构。为了提高夹具的定位精度和通用性,采用惩罚函数法对曲柄滑块机构优化求解,运用MATLAB对其仿真,并通过有限元方法对关键部件进行优化。研究表明,滑块在对零部件的夹紧定位过程中具有一定的行程,且受到曲柄、连杆的长度和最小传动角的影响。当曲柄和连杆的长度分别为300 mm和500 mm时,机构的通用性能达到最佳。最后通过有限元方法对关键零件优化分析,得到了最优结果,对中定位机构的定位精度达到了0.38 mm。

关键词: 对中定位机构, 惩罚函数法, 曲柄滑块机构, 优化分析, 最小传动角, 有限元方法

Abstract:

Display positioning fixture is the key equipment on the display assembly line, which plays an important role in realizing the automatic assembly of display. In this paper, a pair of centering positioning mechanisms for the crank slider is designed for the display positioning fixture. In order to improve the positioning accuracy and versatility of the fixture, the crank slider mechanism is optimized by the penalty function method, MATLAB is used to simulate it, and the key components are optimized by finite element method. The results show that the slider has a certain stroke in the process of clamping and positioning the components, and is affected by the length of the crank, the length of the connecting rod and the minimum transmission angle. When the length of the crank and the length of the connecting rod are 300 mm and 500 mm, respectively, the general performance of the mechanism is the best. Finally, the key components are optimized and analyzed by the finite element method, and the optimal results are obtained, so that the positioning accuracy of the centering positioning mechanism reaches 0.38 mm.

Key words: centered positioning mechanism, penalty function method, crank slider mechanism, optimization analysis, minimum transmission angle, finite element methods

中图分类号:

TP242.3

伞红军, 李鹏宇, 陈久朋, 胡琼琼, 李奇, 张凯翔, 王晨. 一种对中定位机构的设计及其优化分析[J]. 电子科技, 2021, 34(1): 10-16.

SAN Hongjun, LI Pengyu, CHEN Jiupeng, HU Qiongqiong, LI Qi, ZHANG Kaixiang, WANG Chen. A Design and Optimization Analysis of the Centered Positioning Mechanism[J]. Electronic Science and Technology, 2021, 34(1): 10-16.

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γ_min	最优解X^*		L₁	L₂	S_max
γ_min	a	b	L₁	L₂	S_max
40°	300	500	331.963 9	754.851 0	422.887 1
45°	300	500	357.589 1	743.054 5	385.465 4
50°	300	500	383.614 4	729.958 9	346.344 5
55°	300	500	409.780 4	715.597 7	305.817 2
60°	300	500	435.889 9	700.000 0	264.110 1

编号	x(H₁)	y(V₂)	z(FD₁)	变形量
1	1 125	380	10	3.490 5
2	1 050	380	10	3.108 8
3	1 200	380	10	4.128 9
4	1 125	380	7	10.317 0
5	1 125	380	13	1.579 1
6	1 125	342	10	4.788 2
?	?	?	?	?
12	1 064	410.9	7.560 9	6.726 7
13	1 186	410.9	7.560 9	8.487 2
14	1 064	410.9	12.439 0	1.495 5
15	1 186	410.9	12.439 0	1.884 9

待选点	x/mm	y/mm	z/mm	应力/MPa	变形量/mm
1	1 123.6	380	12.7	34.774	1.697
2	1 050	418	13	36.711	1.238

编号	x(H₁)	y(V₂)	z(FD₁)	变形量
1	1061.3	383.63	12.28	0.380 91
2	1070.3	379.19	11.16	0.395 86