Clear thinking of plastic mold design, plastic mold processing quality can be guaranteed
85% of the mold quality of the injection mold factory depends on the design. The quality of a set of injection mold design involves a wide range of aspects. In addition to requiring the designer to have rich theoretical knowledge and practical experience in mold, the designer’s design ideas are also important. Based on the years of mold design experience of mold design engineers, the injection mold factory summarized the main ideas of mold design: the injection mold factory based on the years of mold design experience of mold design engineers.
The main injection mold design ideas are summarized as follows:
1. understand the plastic part drawing: whether the mold opening conditions are met, such as whether the demoulding slope is reasonable, whether the product will shrink and deform after demoulding, and whether the structure meets the demoulding requirements.
2. confirm the plastic variety: there are many kinds of plastic materials. Determine the variety to determine the shrinkage rate, and understand the fluidity to determine the design of gate and runner. Understand the corrosiveness of plastics to determine the selection of die steel.
3. design of formed parts: the appearance, processing mode, mold strength, demoulding mode, cooling mode, fluidity, exhaust and other issues must be considered in the design of formed parts.
4. mold material: according to different plastic and product requirements, correctly select the steel for injection mold, so as to meet the quality and life requirements of injection mold, which requires the designer to have sufficient understanding of plastic and steel.
5. molding machine specification: understand the mold locking pressure of the injection machine, the capacity of the injection machine, the mold opening stroke, the size of the locating ring, the nozzle radius of the barrel, and the position of the mold locking screw hole.
6. cavity and its arrangement: determined by the projected area, shape, accuracy, output and benefit of the product. All aspects coordinate and restrict each other to determine the mold base and standard parts.
7. runner mode: hot runner or ordinary runner? Is it direct feeding (two plate die) or indirect feeding (three plate die)?
8. gate mode: there are many kinds of gates, which vary according to the demand. When selecting, we must consider the appearance requirements of products, plastic fluidity, weld lines, exhaust and other issues, as well as whether the gate model and size are sufficient to fill the entire cavity.
9. parting surface selection: parting surface selection is an important link in the mold design of injection mold factory. When selecting parting surface, designers must consider many factors such as product appearance, demoulding method, and injection mold processing.
10. design of lateral core pulling mechanism: there are many changes in this part, and the structure is relatively complex.
11. demoulding methods: various methods. Pay attention to the balance of demoulding, the strength, appearance, function of the mold and how to balance with the cooling effect.
12. exhaust: exhaust is very important to ensure the quality of the product. Exhaust in various forms. Pay attention to prevent vacuum adsorption and the mold from being pulled open when the product is demoulded.
13. cooling: cooling has a great impact on the production of injection mold, while the design work is complicated. It is necessary to consider not only the cooling effect and cooling consistency, but also the impact of the cooling system on the overall structure of the mold.
14. processing method: all mold designs must consider the feasibility of injection mold processing, so that the designed mold can have practical value. The design divorced from the actual factory mold manufacturing will become a dead letter.
15. die drawing: draw the die drawing according to the above concept, including assembly drawing, part drawing, push rod position drawing, wire cutting drawing and other drawings related to processing. In the drawing process, the structure of each system of the mold is further improved to make the design of the injection mold more reasonable.
16. proofreading and review: after the mold design is completed, it is necessary to coordinate with the customer and relevant personnel to conduct proofreading and review to check the overall structure, processing feasibility and omissions in the drawing process in many aspects, and solicit customers’ opinions, so as to avoid difficulties in the manufacturing and use of injection mold due to design errors, and some will also cause mold scrap.
In the mold design of injection mold factory, whether the design idea is clear or not is directly related to the guarantee of processing quality. In the process of mold design, a number of factors need to be comprehensively considered, including plastic part drawing, plastic variety, molding part design, mold material, molding machine specification, cavity arrangement, runner mode, gate mode, parting surface selection, lateral core pulling mechanism design, demoulding mode, exhaust, cooling, processing mode, mold drawing, proofreading and review, etc. Only when all these aspects are considered and reasonably designed, can the quality and life of the injection mold meet the requirements, and avoid the manufacturing and use difficulties caused by improper design, or even the scrapping of the mold.
Therefore, when designing the mold, the injection mold factory should pay attention to the clarity and comprehensiveness of the design idea to ensure that every detail has been carefully considered. Only in this way can we design high-quality injection mold and provide reliable processing guarantee for customers.