Research On Application Of Virtual Prototyping Technology To Grating Ruling Engine

Grating manufacturing technology is one of the most sophisticated technologies,and the grating ruling engine, which is used to manufacture grating, is known as the"King of precision machinery". It usually scores thousands of grooves per mm on theglass pressing blank, and requires accidental error less than1/10of grating constant,periodic error less than1/100grating constant and wavefront difference also less than1/3stripes. All of these performances determine that the grating ruling engine has ahigh precision, not only mechanism but also control system. Because ofultra-precision, parts are difficult to be manufactured, the development cycle is long,and the cost is also expensive. The traditional development process based on thephysical prototype does not apply to develop the grating ruling engine because itneeds repeated trial and modification and multiple physical prototypes aremanufactured before the final product. In this paper, the development process basedon virtual prototyping technology, which can reduce the physical experiments anddevelopment cost, shorten the development cycle, and improve the design quality, ispresented to develop the grating ruling engine. More importantly, this method doesnot repeat to manufacture the physical prototyp, so it avoids the traditional method'sdefect.At first, the virtual prototype model of the grating ruling engine is established,including indexing subsystem and ruling subsystem. The indexing subsystem achievesthe ultra-precision positioning, and the ruling subsystem performs the ruling operation.These two subsystems work together to rule grating. In the working process, thetransmission performance affects the quality of grating, so it is necessary to beanalyzed and optimized to obtain the optimal design. In the transmission of theindexing system, influence of inertia on the control is analyzed and the inertiaoptimization objective is determined with the fast and stable respond. The sensitivityanalysis method is used to obtain the relationship between structural parameters andinertia, and then parameters are calculated to meet the requirements of inertia andstiffness. In order to ensure the quality of grating, the nickingtool need to maintainuniform motion, so the equal-speed transmission mechanism of the ruling subsystemis very important. In this paper, the displacement, velocity and acceleration of theinitial transmission mechanism design is calculated by using kinematics simulation based on virtal prototype technology. From the analysis, the inadequacies that jump ofacceleration occur at transition location is presented, so cycloidal motion law isadopted to amend this phenomenon to get better design and ensure the continuity ofmotion.Grating ruling engine is one of the major mechanical and electrical equipment,whose design and analysis require a comprehensive platform for development andperformance evaluation. This paper presents a new methodology which combinesmechanism and control to simulation. In the integrated development environmentprovided by virtual prototype technology, complex control system is jointed tomechanism system to simulate the product performance. In this paper, the micro stagewhich is most important for positioning accuracy is analyzed. An appropriatesimplified stage's simulation mode is established and control system is also built toachieve co-simulation. The effectiveness of control algorithms is verified and controlparameters are obtained by using co-simulation platform.In the grating ruling engine system design, control software is an important part.In the traditional software development approach, the software is usually developedand debugged after the completion of the hardware processing which extendsdevelopment cycle and is unable to adapt to the fierce market competition. In order toachieve the parallel software development, software simulation developmentmethodology based on the virtual hardware in the loop is proposed. Computer is usedto simulate the actual control unit for software development and debugging with thecontrolled object's model. This paper uses grating ruling engine's control software asresearch subjects to describe the software simulation development. The developedapplication is ported to control the real grating ruling engine...