The application of "productized mode" numerical control training in technical schools makes the implementation of integrated teaching more targeted and effective. It enables students to come into contact with various issues that may be encountered in future work, and use certain capabilities or methods to solve production problems, and to design and provide an environment for students to “learn†in “doingâ€. The skills of “doing†and “doing†will cultivate their ability to adapt to the dynamic development of social requirements, and enable them to seamlessly connect with the employment enterprises after graduation, thereby improving the quality of employment. The organization of the “productized model†of numerical control training is an integration. An attempt to implement the teaching. The following is a discussion of some of the practices in our school's "product model" numerical control training.
I. Practicality of "Production Mode" in Numerical Control Training Theoretical Courses
The technical school attaches great importance to how students connect theories theoretically with practical training. In accordance with the standards of the manufacturing enterprises, the rules and regulations are formulated, and the exhibition boards are placed in the training workshop. Put "safety production, everyone's responsibility" as the top priority.
15 minutes before class will be safety education before classes. According to the requirements, the NC teaching and research group has compiled the safety operation rules for CNC machine tools, and arranges highly targeted safety education courses so that the students have a basic understanding of the safety issues of the machine tools they come into contact with;
Secondly, the contents involved in professional basic courses (mechanical drawings, tolerances, metal materials, etc.) are described one by one. For example, in the part processing training course, 1. The parts drawings are analyzed, the workpiece positioning and clamping scheme are determined, and the reasonable selection is made. The positioning reference plays an important role in ensuring the dimensional accuracy and mutual position accuracy of the workpiece. 2. Analyze the material selection of the parts. The tools for CNC machining not only require high precision, good rigidity and high durability, but also require installation, adjustment, chip breaking and chip removal performance. Reasonable choice of cutting amount in production teaching according to process requirements is very important. important. 3. During the programming process, the programmer must fully grasp the parameters of the geometric elements that make up the contour of the part and the relationships between the geometric elements. Because all geometric elements of the part contour are defined during automatic programming, the coordinates of each node are calculated during manual programming. No matter which point is not clear or uncertain, programming cannot be performed. However, due to poor consideration or neglect of some parameters in the design process of parts, there are often incomplete or unclear parameters, such as arcs and lines, arcs and arcs are not clearly tangent or intersecting or separating, resulting in processing failure , Retiring parts and causing unnecessary losses.
A series of production experience has achieved good results in the teaching of "product model". Students learn to become active through passive learning, individual learning changes into team learning, and knowledge learning becomes more capable.
Second, the importance of the "product model" in the integrated teaching reform of numerical control training
In-depth and detailed understanding of the company's production and operation can neither be completely copied nor separated from the reality of the enterprise. The operation must first be based on the student's personality and characteristics and on the basis of the student subgroup. Such as school-enterprise cooperation production and processing of external parts, D24016001 shaft, the part blank is 42CrMo alloy steel, this material has high strength and toughness after heat treatment. From the analysis of drawings and materials, the selection of tooling aids, the preparation of the process, and the start of the machining program. 60 X400, after processing: the outer circle is 55, 48, 25, the precision is -0.033mm and there is a center hole 3/4, and the preparation process is as follows: 1. The car end face, hit the center hole 3/4. Due to the slow manual speed of the tailstock on the CNC lathe, it needs to be designed as a tool holder, and the center drill of 2.5 is placed in the tool holder, and then the tool holder is loaded into the tool holder to correct the position. Knife, writing program. This greatly shortens the processing time, increases the processing efficiency, and provides time for subsequent processing. 2. Outer circle 55, guaranteed total length 395. 3. Outer circle 48, 25. 4. Quality inspection. In the processing of the 3rd order, the concentricity of this part is relatively high. Under the existing machine tool and auxiliary equipment of the school, we will use the claws as soft claws to carry out the processing in a clip-on-top manner, and finally guarantee the quality and quantity. Finished the processing task.
Through the processing of this product, students learned how to write processing technology files. Processing technology documents are the main technical documents that guide workers to operate and organize production management, and all personnel must strictly implement them. It is important to stress the students' repeated emphasis and key requirements, especially the normative nature of the operation card and the tool card content and form. The training teacher is a person who combines various soft and hard conditions in teaching, and is the leader of integrated teaching. At the same time, he is the person who masters the mainstream practical technology and is the soul of the integrated numerical control training teaching. The practical training teachers are both front-line technical workers and professional teachers in the whole practical training activities. They are both workshop directors and equipment maintenance personnel. They are both teachers and masters, and they have multiple identities. To be competent to guide students in different conditions for learning and practice, to guide students to explore thinking, organized, on-site management capabilities, but also equipment technology experts. His skills and abilities directly affect the depth of student's learning. His attitude and sense of responsibility directly affect the student's learning effect.
Quality is the lifeline of a company. It is also a practical training and training of students' strict quality concept. Establishing a strict quality inspection system is an extremely important requirement for the teaching of a “productized modelâ€. It is also a criterion for the school to cultivate high-quality, high-standard skilled personnel. As an important teaching material to regulate.
Third, the conclusion
"Production mode" numerical control training method to cultivate and improve the student's hands-on ability and practical skills, is the purpose of NC professional teaching in technical schools. Only in practice, students can integrate theory with practice, apply textbook knowledge to practice, and truly improve operational skills and operational levels. For NC professional teachers, adopting methods of practice, side-by-side operation, and side teaching can help students better understand the hard-to-understand textbook knowledge and integrate knowledge and technology into specific practical operations to better adapt them later. Production line work. Taking the numerical control programming class of CNC as an example, we adopt the teaching mode of edge teaching, learning, and practice. Through the actual drill of the machine program and the program input, editing, modification, debugging, and running using the numerical control simulation software, the students It has a real and comprehensive understanding of the production line environment and the processing technology layout, consolidates the basic knowledge, and improves the operating skills in practice, laying a solid foundation for the future work in the production line.
Author: Shanxi Wenxi five hundred forty-one advanced technical schools Cui new
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