Analysis of the impact of plastic mould structure design on mould manufacturing

In the current science and technology level is constantly improving, the productivity level of all walks of life has been significantly improved, the rapid development of computer technology for the progress of plastic mould technology to provide a reliable guarantee, so that the level of plastic mould structure design is constantly improved. Under the wide application of computer technology, the concept and methods of traditional mould design and manufacturing have undergone great changes. In the process of promoting plastic mould manufacturing, it is necessary to continuously optimise the design of its own mould structure, optimise the processing technology of mould manufacturing and enhance the accuracy of the parts. For all kinds of parts production and processing, moulds as the basic content of which, the internal structure will have a direct impact on the quality of the components, which requires the optimization of the structural parameters of the processing components when promoting the structural design of plastic moulds, so as to correctly define the mould processing process and improve the quality of moulded products from the actual needs, so that at this stage of the structural design of plastic moulds It is necessary to optimize the work, play the role of information technology, realize the improvement of the level of plastic mould structure design, and provide reliable guarantee for the development of mould manufacturing work.

1 Plastic mould structure and setting analysis

For the manufacture of plastic components, mould design as a prerequisite, in the early stages of the design work, the mould structure needs to be analysed, for its specific application and mould characteristics to carry out research, so as to determine the size of the plastic mould parameters, to ensure that such specifications of the components can be used in the actual application of their own role out. Once the mould design is complete, the design needs to be examined from a number of angles to ensure that the parameters are optimised from the demands of the application environment, thus laying a solid foundation for the subsequent production and manufacturing work. In the process of analysing the mould products, it is necessary to combine the product assembly position and appearance needs, etc. In this process, it is necessary to actively use the role of CAE software for mould flow analysis, so as to promote the overall work efficiency. At the same time, the need to undertake moulding processing equipment, carry out classification and selection work, the relevant processing parameters for the correct setting, for example, in the process of processing of components, need to start from the status of the inherent physical structure, the development of its limit value.

2 Plastic mould design and manufacturing process

2.1 Pre-design considerations

Before mould manufacturing is carried out, the corresponding mould design work needs to be carried out, and there is a very close link between the two. In the mould manufacturing process, precise operations need to be carried out from the structure and production requirements of the mould design to provide a reliable guarantee for mould manufacturing. When designing a mould, it is necessary to take into account the size and shape of the plastic part and the feasibility of the mould. Under normal circumstances, mould design and manufacturing work is divided, and after the design is completed, the corresponding audit work needs to be carried out, and only after passing, the mould manufacturing work can start, and strictly in accordance with the processing progress plan, the processing process to make reasonable adjustments.

2.2 Analysis of original materials

When designing the structure of a plastic mould, the size, purpose and precision of the product must be analysed, the parameters of the moulding process and the size of the plastic parts must be analysed for precision, and the shape of the relevant parts must be combined to select a suitable method for production. By analysing the type of moulding equipment, the moulding process is explored and the injection pressure, injection capacity and mould installation dimensions of the injection machine are determined to ensure that the parameters are reasonable and that the form of the moulded parts and structural components is determined. In the process of analysing the 3D model, it is necessary to make a reasonable selection of the structural surface parting of the plastic part, in order to better guarantee the smooth release of the plastic part from the mould and to prevent any abnormalities in appearance. In view of the above structural factors, a reasonable design of the corresponding mould can be achieved in order to make the mould safe and reliable and to provide convenient conditions for the release of the mould.

2.3 Conversion of product drawings

After the 3D model is formed, it needs to be converted into a 2D production drawing to carry out the corresponding material layout design work, the designer needs to complete the corresponding core, mould frame, inserts and side cores and other ordering list work. For the processors, they need to analyse the 2D and 3D part diagrams and layout diagrams, and for the various material blanks required for the manufacture of the moulds, the managers need to complete the corresponding ordering work in conjunction with the actual situation of the order forms.

2.4 Completion of process diagrams

After drafting the waterway positions as well as the pushrod positions, the designers should review the various data. For mould processing blanks, the mould processing cycle should be extended slightly, and for other jobs, they need to be equipped as soon as possible. After ordering back the core blanks, the machinist will carry out the rough machining and then the corresponding finishing work. For the six sides of the core, surface grinding and milling processes are usually used, while the corresponding machining work is carried out to create the push rod holes, runners and gates in the core.

2.5 Mould machining

In the course of the designers' work, the 3D software needs to be brought into play in order to obtain the corresponding 3D modeling drawings and, with the help of the automatic programming software, to carry out the corresponding CNC machining work for the cores after the CNC program has been programmed. At the same time, the designer needs to create a plan view of the side sliders and moving mould inserts and then provide the machinist with drawings for the machining of the side sliders and inserts by means of the wire-cutting method or by means of a profile grinding process. When using the wire-cutting method, the corresponding wire-cutting program needs to be prepared in conjunction with the wire-cutting 2D drawing in order to complete the corresponding mould processing work.

2.6 Analysis of plastic mould moulding structures

In the injection moulding process, granular and powdered materials are added to the barrel of the injection moulding machine and then, under the action of heat and mechanical shear, the granular materials are plasticised into plastic pellets, thus enhancing their fluidity. The product is then removed to create a closed mould cavity and the entire injection cycle is completed. For injection moulds, external forces are required to provide injection and holding pressures to ensure that the work is carried out effectively and to avoid rupture and deformation. Therefore, in the process of moulding design, the corresponding work intensity needs to be approved, as the mould is prone to elastic deformation under external forces, and if the degree of deformation exceeds the corresponding precision requirements, it will produce defective products, which will have a negative impact on the quality of processing work. If there is significant deformation on the fitting and joint surfaces of the moulded part, this will cause overflow and difficulties in release, which will not meet the corresponding requirements, and will require approval of the stiffness of the mould structure.

3 Conclusion

When designing a mould, the size and shape of the plastic part should be taken into account to ensure that the workpiece can be processed in accordance with the requirements. For all kinds of plastic parts production and processing, moulds as one of the basic content, the internal structure will have a direct impact on the quality of the components, need to be in the plastic mould structure design, the structural parameters of the processing components to optimise, so as to correctly define the mould processing technology, from the actual needs to improve the quality of mould products.