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Cam-follower connection was created in this way, to click “Cam-Follower Connection Definition” button, open dialog box, tick the checked box “auto select” in “cam 1” and “cam 2” option cards, choose respectively cam and follower’s tip surface as cam surface. Cam 2 needed to choose the two end of tip line as front or back reference, which was specially drawn for defining the cam pair. The line was on the front plane, through tip’s centre and perpendicular to follower’s axis.
Then, to Create spring ,damper, define servo motor and analysis parameters they were ready for motion analysis.
6. Motion simulation results analysis
There are some kinds of parameter may be measured in mechanism module, such as “Position”, “Velocity”, “Acceleration”, “Connect Reaction”, “Net Load” etc.
To click the button of “Generate measure result of analyses”, new-built measures from Measure1 to Measure3, and choose the “Graph measurement separately”, click the button of “Graph selected measures for results sets” in dialog box, measure values can be exported by the graph and the data. It is perceptual intuition and accurate, as Fig. 5 showed.
Fig. 5. The diagram of the follower’s displacement, velocity and acceleration
From all above the output graph of motion simulation, there were following three points can be seen.
(1) In the left of Fig. 5, the follower’s displacement and velocity showed along cosine acceleration law in rise travel, and constant acceleration and constant deceleration law in return travel. They were consistent with their theory running.
(2) In the right of Fig. 5, the follower’s displacement and velocity showed along constant velocity law in rise travel, and sine acceleration law in return travel. They were consistent with their theory running.
(3) In Fig. 5, the follower’s acceleration are approximately consistent with their theory running, though somewhere, as the points of 260°in the left of Fig. 5 and 280°in the right of Fig. 5, had some deviations which due to the spline curve was used in drawing displacement line graph. Nevertheless the method had still increased design accuracy comparing to traditional handicraft graphic method.
7. Conclusions
To sum up, by using powerful design software pro/e, complicated disc cam mechanism was full parametrically designed and their motion was simulated and analyzed. Not only had it built high accuracy model but also realized 16 kinds of typical combination motion law. It improved design flexibility tremendously.
并联组合凸轮机构的设计
摘要这是一个类型Ⅱ的并行机制，这是用来实现任意轨迹的凸轮机制相结合的综合设计。凸轮的联合机制和方法通过分析设计，并通过分析建立数学模型。然后可以显示输入组件，输出组件之间的相对移动的关系，以设计运动轨迹和凸轮的轮廓。还设计了系统的总流程图。说明任意移动轨道的联合组织的方案设计和方法，程序的执行结果，并通过联合方案和接口方法等。使用动画的模仿来测试和验证设计的结果。整个计划的过程中以机械创新为基础，它采取了VB作为开发平台。采用模块设计，实现任意轨迹，使设计的结果达到预期的效果。
毕业论文关键词：仿真技术，并行组合，任意轨迹的凸轮机构，机制设计
序言
随着生产加工的机械化和自动化的发展。在运动的机构和机制的输出功率特性的更高的要求下，单一的基本机制有一定的局限性，它不能满足某些性能要求，越来越苛刻的要求，在项目机械的运动轨迹，如控制机械，复杂的饲料机械等，由于在许多场合的设计、加工和安装等原因，设备无法得到充分实现设计师的意图，人们不得不采用近似的轨迹。高精度的需求，复杂的运动越来越多，加工能力的不断进步。特别是在一些小型和精密部件的加工，这项工作将需要非常精确的刀具轨迹。因此，有了机械设计实现运动轨迹的迫切要求。因此，它是提高机械创新的紧迫任务，加快创新机制的步伐，为机械工业，以满足我们日常处理的需求。