With the progress and development of society, metal molds are gradually widely used in various fields, and the design of metal molds is becoming more and more complicated. In view of the common problems in the design of metal die, this paper makes an in-depth study of the common problems, and analyzes the improvement methods for the corresponding problems. It has practical reference value to solve similar mold design problems.

At present, due to the continuous progress of manufacturing technology, people have higher and higher requirements for production and living materials, so people not only pay attention to its function when manufacturing products, but also pay more attention to the artistic aesthetic design of products. This puts forward higher requirements for the design process of metal mold, so in this field, continuous research and exploration, find problems and find solutions in the research, in order to obtain metal mold exquisite art

Common problems in metal mold design

Metal mold in the forming process, there are many factors involved, in accordance with the correct design steps, but also take into account their own thermal expansion coefficient, shrinkage and other issues, these are the key factors of metal mold design. The structure of the metal mold determines the form, in fact, depends on its own material properties, as well as the heat treatment method, choose the appropriate design method, the use of the metal mold performance can be strengthened, the life can be extended. After preliminary research, the academic circle has obtained the following problems about the metal mold in the development process.

1.1 Problems in mold forming

The factors that affect the shrinkage rate are: the variety of products, forming conditions, metal mold structure. It reflects the degree of size reduction after the product is removed from the metal mold to cool. The prerequisite for the metal mold to become a finished product is in a high temperature environment, which can be dissolved into a flowing liquid state and then shaped through the mold cavity. Its own characteristics determine that it is subject to its own characteristics and changes in the process of styling, and this change is contraction.

1.2 Problems in mold production

After the metal mold becomes a finished product, its shape and volume directly depend on the coefficient of thermal expansion. The coefficient of thermal expansion indicates that the object has the phenomenon of expansion and contraction due to the change of temperature, and its change ability is the volume change caused by the change of unit temperature under constant pressure (p certain). The coefficient of thermal expansion is usually not constant over large temperature ranges. At the same time, different forms have different coefficients of thermal expansion, which determines that the production of metal molds is very difficult before they are made into finished products. Of course, at the same time, it also fully demonstrates that the coefficient of thermal expansion plays a decisive role in the process of metal mold production, so the designer's advance budget and estimation, rigorous analysis and research, becomes an essential factor. From the surface, the price of the metal mold is far less expensive than the price of diamonds, nor the elegance of diamonds, but its production process is cumbersome and complex, and the design cost is high, so the designer must weigh the pros and cons in the design process, considering all aspects of factors. It is necessary to consider the cost of investment, but also to study in terms of technology, and introduce new ideas in order to achieve perfect results. The instability of product attributes determines that designers need to introduce more exquisite technology and continue to study and explore in this field. In order to create a perfect model of the product, as well as effectively ensure the metal mold molding, metal mold design improvement methods have been put on the agenda.

2. the improvement method of metal mold design

2.1 Improvement methods in the process of metal mold design

(1) Mold making: The design process should use a scientific and reasonable manufacturing process to ensure scientific and effective production, and pay attention to its own attributes, as well as factors such as thermal expansion coefficient and shrinkage rate, which occupy an important proportion in the metal mold making process.

(2) test mold practice: After processing the metal mold, it is necessary to test the mold, so as to ensure that the production is a perfect finished product. Collect data for trial practice, and then modify the metal mold, and finally perfect to create first-class art. The test mold is an extremely important key link in the production process, which must be carried out in strict accordance with the test mold procedure to ensure the value of the finished product produced.

(3) Core pulling: For metal molds with lateral holes and bad structures, the core pulling work should be successfully completed when the metal mold is demoulded. The design of core-pulling is very critical, which is related to the quality and life of the metal mold, and is a key factor in measuring production efficiency and quality. The research and development of reasonable core-pulling technology is helpful to the successful completion of core-pulling. Under normal circumstances, the stripping force and pneumatic and hydraulic direct core-pulling are used to pull the core.

2.2 Improvement method of metal die process design

According to the difference in tolerance labeling, the corresponding metal mold is selected, and the tolerance labeling is selected according to the actual situation of the metal mold. The higher the precision of the metal mold, the higher the tolerance should be marked, so that it can be matched harmoniously, complement each other, and ensure the rationality of the size of the metal mold. On the contrary, metal molds with low precision use low tolerances. In this way, it will not be economically unnecessary consumption and loss, and it can reduce the error range and minimize the error.

2.3 Optimization of improvement methods in the whole process of mold design

The designer should fully understand the attributes, master the information and data of the metal mold, and fully grasp the information of the metal mold, so that the design program can be effectively improved. For example, a series of factors such as the size of the metal mold, factors affecting the forming of the metal mold, operating methods and operating skills, the size of the mold cavity, etc. These factors affect the state, shape, aesthetics of the metal mold, and the improvement of the metal mold making process, which requires continuous research and draws its own production experience in the research. This is a product to become a work of art. Rise to the artistic aesthetic value of the necessary link

With the wide application of hot runner technology in all walks of life, the development of mold molding technology has been mature, and the design of mold in China is also in a rising stage. The design of metal mold has been included in the research object, in order to develop a rich metal mold, it has become an important topic for researchers. Designers in the field of mold design research has also paid all efforts, in order to achieve the perfect mold process, mold design excellence, the advent of skilled metal mold art, researchers for its design process constantly appear to find solutions to problems. Only by finding a solution to the problem can the metal mold industry stand out in the market competition. This paper analyzes the problems existing in the design process of the metal mold, and summarizes the improvement of the technical problems existing in the molding and production process of the metal mold; Secondly, it sums up the improvement methods to solve the problem. The research and exploration in this field requires a large number of researchers to carry out more research and practice to obtain rich experience and conclusions, in order to promote the continuous development of the mold industry, and has important practical value.