Source: Yisu laser
The medical apparatus and instruments themselves have exacting precision properties.Therefore, it also puts forward more precise technical requirements for the production of medical apparatus and instruments.In the process of supporting the production of medical parts, there is no room for any flaw in the surface quality, accuracy and hygiene requirements of injection molding products from large to hyperbaric oxygen chamber to small to hearing aid, anesthesia laryngoscope, medical buttons, etc.
There is a need, so it will be changed, the injection molding product yield is mainly related to injection molding machine, mold, raw materials and the use of temperature control system.Then how to improve the source — the mold, to ensure that medical and other sophisticated products to improve the quality standards and speed up the production speed, has become the focus of our many medical device mold manufacturers.
ESU will take medical laryngoscope as an example to jointly explore the specific advantages and analysis of 3D printing in advanced projects in the medical field.Disposable anesthesia laryngoscope for medical use is the most complex and typical injection product for medical use.See Figure 1.
一：the product structure is complex, the top space is narrow.
二：The top tip contacts the skin inside the body, and the material hygiene requirements are strict.
三： the size, quality requirements are strict, do not allow surface defects.
四： Injection product pharyngoscope is generally a disposable product with large quantity and price and cost under control.
Therefore, for mold manufacturers, how to handle the balance of quality, efficiency, sanitation and other aspects of laryngoscope mold, become the key.
As is known to all, waterway system is one of the important factors of mold product quality. Superior waterway system can shorten product forming cycle and improve product yield.But at present, the waterway is basically made by milling machines and other machining processes, unable to process curved waterways, waterways can not cover the mold cavity.
As shown in FIG. 4, in view of the dilemma faced by common solutions, the shaped waterways designed with additive manufacturing technology can be solved line by line.
1. Molding cycle
Compared with the traditional waterway, 3D printing can design a waterway system covering the mold cavity, thus speeding up the cooling, shortening the workpiece forming cycle and improving the production efficiency.
As shown in the figure above: the cooling time of the traditional waterway mold is about 32S, and the cooling time of the shaped waterway scheme is 23S. Compared with the original scheme, the time of the 3D printing to reach the ejection temperature is 23% faster
2. Surface quality
Molding quality of injection molding products has a great relationship with mold temperature, mold temperature is not balanced, the difference between the highest temperature and the lowest temperature is large, then the high temperature is easy to produce scald, deformation and other defects, product yield is low.3D printing can reduce the temperature difference, balance the mold temperature, and improve the product yield.
Through the comparison of mold flow analysis results, the temperature difference between the highest temperature and the lowest temperature of the ordinary water mold is 32.5℃, while the temperature difference between the water mold and the lowest temperature can be reduced to 4.98℃ with the shape of the water, it can be said that the temperature difference has been very small.
In addition, the EM191 metal powder material independently developed by ESU yisu was selected for the 3D printing material of the mold.EM191 is a powder in the powder system independently developed by ESU yisu. It has the functions of rust prevention, corrosion prevention, abrasion resistance and durability, so as to ensure the service life of the printed parts.In the powder system independently developed by ESU, there are special metal powder materials for 3D printing, such as EM181 and EM201, for material selection and printing according to different requirements.
With the development and improvement of technology, 3D printing is bound to be applied in more and more fields, and mold manufacturing must also make use of new technology to make up for its own shortcomings and limitations.ESU yisu has always been adhering to the mission of opening a new era of mold manufacturing, and strive to inject fresh blood into the traditional mold and bring new vitality to the traditional manufacturing industry.