What is the gap between us and foreign printing ma

2022-07-24
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In recent years, with the development of mechanical design level, dynamic analysis theory and computer technology, there have been some mature commercial software, such as finite element analysis software ANSYS, NASTRAN, ABAQUS, sap, multi-body dynamic analysis software ADAMS, VirtualLab, etc. we will continue to transform our products. These software are widely used in Aerospace Engineering, mechanical engineering Vehicle engineering, construction engineering and other fields have been widely used, and achieved good benefits. In addition, there are some good 3D modeling software, which provides a reliable basis for the simulation analysis of mechanical system

at present, some printing machinery manufacturing enterprises in China have adopted 3D modeling software to establish the 3D part model library of the whole printing machinery. However, the finite element analysis software and the dynamic experimental machine are generally used without any problem analysis software, which has not been used for the dynamic analysis, control and optimization of the mechanical system. From several stages of the development of mechanical design method, the design method of printing machinery in China is still in the second stage. The first stage of static design is a design method that does not consider the motion of components, but this method has long been eliminated; The kinematic design of the second stage considers the kinematic performance of the components, and only theoretically ensures the accuracy of the motion; The third stage of dynamic design is to do dynamic analysis on some key components on the basis of kinematic design, including natural frequency, maximum stress, maximum deformation, component optimization and fatigue life analysis, so that the natural frequency of components or systems should be as far away from the normal working frequency of the printing machine as possible, so as to prevent resonance and prevent unstable or premature failure of the dynamic performance of key components of the machine. When the simulation results do not meet the design requirements, the part or system parameters can be modified, and then the dynamic analysis can be carried out, which is actually a dynamic design process; The fourth stage is to integrate the part design, kinematics design and dynamics design, use the visual platform to establish the virtual prototype model of the mechanical system, analyze and predict the dynamic performance of the actual mechanical system under various working conditions, and it is very convenient to modify the design. All calculations are carried out in the background without manual intervention. Foreign printing machinery manufacturing enterprises applied dynamic analysis to design earlier. For example, Heidelberg company in Germany used finite element analysis and virtual prototype technology to carry out various dynamic analysis on key components and important mechanisms of the printing machine. The performance index parameters obtained provide a basis for modifying and optimizing the design. As we all know, Heidelberg's printing press has the characteristics of long service life, high reliability, high precision, high speed, low noise, low vibration and high intelligence. This is due to a lot of analysis work done in the early stage of design, which brings low cost, high design efficiency and greater economic benefits to the enterprise

printing machine is a very complex system, which is composed of mechanical system, pneumatic system, hydraulic system and control system. The functions of the whole printing machine depend on the cooperation of various systems. As the implementer of the printing machine function, the performance of the mechanical system directly affects the printing accuracy. The paper feeding mechanism, paper delivering mechanism, paper transferring mechanism, register mechanism and the vibration of wallboard are all the key parts of the mechanical system. This paper analyzes the application of advanced design technology in the design of printing press by taking the paper transfer mechanism as an example. The whole process is divided into two parts; Design domain and analysis domain

design domain:

-- kinematic design: the paper feeding tooth pendulum is mainly used to design the arm motion law of automobile engine components and the motion trajectory of tooth pieces

-- Part Design: including 2D design of cam, roller, swing arm, transmission shaft and other parts

-- 3D modeling: use 3D modeling software to realize 3D design of parts

analysis domain:

-- multi rigid body virtual prototype: on the multi-body dynamics software platform, the paper transfer mechanism multi rigid body virtual prototype system is developed and analyzed by adding motion pairs and boundary conditions to the three-dimensional part model. If the motion performance cannot meet the design requirements, it is necessary to return to the design domain to modify the design and motion law of the part

- Multi flexible body virtual prototype: on the basis of multi rigid body virtual prototype, some key parts are made flexible, and finite element analysis is carried out to obtain and analyze the multi flexible body virtual prototype system of the paper transfer mechanism. By comparing the motion trajectories of the teeth of the multi rigid body virtual prototype and the multi flexible body virtual prototype, the paper transfer accuracy can be judged. If the simulation accuracy at the design speed cannot meet the design requirements, Similarly, you should return to the design domain to modify the design and motion law of the part

finally, the physical prototype is manufactured according to the multi flexible body virtual prototype for verification test. Due to a lot of work done before manufacturing, the test cost is greatly reduced and the development cycle is accelerated

The design method of

printing press must be paid enough attention. It plays a vital role in improving the grade of printing press and revitalizing national industry. As the gap between domestic and foreign countries is multifaceted, the level of domestic machines will still lag behind similar foreign products in the short term. Therefore, domestic enterprises should make overall plans, adopt correct strategies, and strive to shorten the gap in order to occupy a place in the high-end market

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the development of computer technology, electronic technology, digital technology and networking technology has had a positive and far-reaching impact on the printing industry, especially for prepress equipment and technology, which can basically be digitized. The application of the new technology in the printing press is first shown as the digital printing press that guides the development direction of the printing press. Its flexibility, rapidity and intelligence can fully meet the market demand of customers for face-to-face printing requirements and even for face-to-face modification of originals; Secondly, the control technology of the traditional printing press has greatly improved the operability and automation of the printing press. Although the digital printing press is developing rapidly, it can not completely replace the traditional printing press under the current market demand, and the traditional printing press will dominate in the near future or even longer

at present, there are hundreds of printing machine manufacturing enterprises in China, which produce a large number of various types of printing machines every year, including offset printing machines, gravure printing machines, flexo printing machines, etc. These printing machines mainly occupy the domestic medium and low-end printing machine market, while the high-end market is still monopolized by foreign imported printing machines. We can see that there is still a big gap between the domestic printing press and the same type of foreign imported printing press. This gap can be seen not only from the design, materials and processing technology of the printing press, but also from the various properties of the printing press according to different temperatures. In the new situation, China's printing machinery industry is facing both opportunities and challenges. The key is whether we can seize the opportunities, find the gaps and adopt correct and effective methods to meet the challenges

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