Graduation thesis of mold design and manufacturing specialty
Mould is a technology-intensive and capital-intensive product, and its position in China's national economy is also very important. Mould industry has been officially identified as the basic industry in China and listed as the key supporting industry in the Tenth Five-Year Plan. Due to the continuous development of new technologies, new materials and new processes, mold technology is constantly improving, and the requirements for talents' knowledge, ability and quality are also constantly improving. According to the new requirements of social development for teaching and educating students majoring in mold, the College of Engineering and Technology of Shenzhen University has carried out great reform on the graduation design of students majoring in mold design of grade 99, and achieved good results. 2 Training objectives of mold students The mold design and manufacturing major of Ganjiang University is mainly engaged in the design and manufacture of injection molds. In order to clarify the training goal of this direction, we have conducted a relatively extensive social survey on mold enterprises in Jiangsu and Zhejiang provinces, especially in its surrounding areas. The survey results show that employers require graduates to have high ideological quality and moral cultivation, love their jobs, have good coordination skills, require graduates to have a solid basic theory, pay attention to mastering and re-learning basic skills, and require graduates to be proficient in foreign languages and have certain computer software application and development capabilities. According to the analysis of the survey results, our specification for mold professionals training is set as: training applied engineering management talents who love their jobs, have basic knowledge of machinery and various mold design and manufacturing, have strong relearning ability and creativity, and can engage in mold design and manufacturing, technology development, applied research and sales in the front line of mold production. Based on this, the basic guiding ideology of teaching in this direction is to broaden the professional caliber, set up the curriculum system reasonably, optimize the teaching content, have strong experimental research ability and wide social adaptability, and integrate mold design theory, practice and computer application. The application of computer technology in plastic products of injection mold is a very complicated process from design to molding production, which includes several important aspects such as plastic product design, mold structure design, mold processing and manufacturing, and plastic parts production. It requires the joint efforts of product designer mold designer, mold processing technicians and skilled operators, and it is a process of repeated iteration, continuous optimization design, modification and redesign. Traditional manual design has become increasingly difficult to meet the needs of fierce market competition. The application of computer technology is replacing the traditional manual design method in all aspects and has achieved remarkable economic benefits. The application of computer technology in injection mold is mainly manifested in the following aspects: (1) Design of plastic products: 3D modeling software based on features provides a convenient design platform for designers, and various physical parameters such as product quality and volume lay a good foundation for subsequent mold design and analysis. (2) Structural analysis: Finite element analysis software can be used to analyze the strength and stress of products and improve the structural design of products. (3) Mold structure design: According to the shape, precision, size, process requirements and production batch of plastic products, the mold design software will provide corresponding design steps, parameter selection, calculation formula and standard mold base, and finally give a complete set of mold structure design drawings. (4) Simulation of mold opening and closing movement: CAD technology can be used to simulate the whole process of mold opening and closing and product launching, so as to check out the irrationality of mold structure design and correct it in time to reduce mold repair time. (5) Numerical analysis of injection process: CAE method can be used to simulate the flow and pressure holding process of plastic melt in the mold cavity, and the results are of great guiding significance for improving the gating system of the mold and adjusting the injection process parameters, and can also test the rigidity and strength of the mold, the warping deformation of the product and the cooling process of the mold wall. (6) NC machining: NC programming software can be used to simulate the real-time machining process of tools on a three-dimensional curved surface and display the shape data of the curved surface. At the same time, it can automatically generate NC wire cutting instructions for curved surfaces, three-axis and five-axis NC milling tool paths. At present, the mainstream CAD software of injection mold in the world includes Pro/E, I-DEAS, UG Ⅱ, SolidWorks and so on. Structural Analysis software includes MSC, analysis, etc. The numerical analysis software of injection molding process includes MoldFlow, etc. CNC machining software includes MasterCAM, Cimatron, etc. 4 Graduation Design Mode of Mould Specialty Students in Mould Specialty require strong comprehensive knowledge and practical ability, which is not only the comprehensive application of basic technical courses and professional courses such as mechanical drawing, engineering materials, tolerance fit and technical measurement, plastic molding technology and equipment, but also requires students to know a lot of practical experience. Through graduation project, students are trained in the following basic abilities: ① the design of plastic products and the selection of molding technology; (2) the design ability of the general plastic product molding die; (3) plastic product quality analysis and process improvement ability, plastic mold structure improvement design ability; ④ Knowing the commercial software commonly used in mold design and the combination with actual design, the previous graduation design can only be regarded as the curriculum design of mold design strictly; Teachers designate a plastic product, and sometimes even give students a model drawing of the product. Students follow the mold design steps in spy photos book step by step. Without practical experience, it is impossible for schools to turn students' designs into practical products. Therefore, students don't know whether these designs are reasonable. Even experienced teachers can't point out the irrationality. Students have no perceptual knowledge and can only talk on paper. When students set foot in the society and engage in actual product design, they often find that they can't start. Even if they design it, it is a piece of waste paper, and it usually takes 1 to 2 years to get started.