上海How to solve the problem of dimensional accuracy in Dalian injection molded medical equipment products?

Dalian injection molded medical equipment products have broad application prospects in the medical field. By continuously optimizing materials, processes, and technologies, injection molded products will be able to better meet the safety, reliability, and efficiency requirements of the medical industry, and make greater contributions to human health.

The mold is the core of injection molding, and its design directly affects the quality and production efficiency of the product. Molds need to be precisely designed and processed according to the shape, size, and material characteristics of the product, usually using high-precision equipment such as CNC machines and EDM for manufacturing. Medical polymer materials need to be dried before use to remove moisture and avoid the formation of bubbles or defects during injection molding.

How to solve the problem of dimensional accuracy in Dalian injection molded medical equipment products?

Accurate mold design and manufacturing: In the mold design stage, precise calculations and designs should be carried out based on the size, shape, and accuracy requirements of the product. Consider factors such as plastic shrinkage rate and demolding method, and reasonably set the size and tolerance of the mold. For example, for plastic materials with high shrinkage rates, the mold size should be appropriately increased to compensate for the shrinkage after molding. At the same time, high-precision processing equipment and advanced processing technology are used to manufacture molds, ensuring the dimensional accuracy and surface quality of the molds. By using processes such as electrical discharge machining and wire cutting, high-precision mold processing can be achieved.

Optimizing injection molding process parameters: The process parameters during injection molding have a significant impact on the dimensional accuracy of the product. Accurate control of injection pressure, injection speed, holding pressure, holding time, cooling time, and other parameters is required. Find the appropriate parameter combination through trial molding and adjustment. Generally speaking, higher injection pressure and holding pressure can reduce product shrinkage, but excessive pressure may cause problems such as flash and deformation of the product. Insufficient cooling time will cause the product to continue shrinking after demolding, affecting dimensional accuracy. Therefore, it is necessary to adjust these parameters reasonably based on the material characteristics and product structure.

Selecting high-quality raw materials: The stability of raw material properties is crucial for the dimensional accuracy of products. Choose plastic raw materials with good fluidity, stable shrinkage rate, and good thermal stability. At the same time, it is necessary to ensure the consistency of raw material quality and avoid product size fluctuations due to batch differences. For example, for high-precision medical device products, priority should be given to imported high-quality medical grade plastic raw materials, and suppliers should be required to provide detailed material performance reports and quality assurance certificates.

Equipment maintenance and calibration: Regularly maintain the injection molding machine to ensure the normal operation of its mechanical components, hydraulic system, temperature control system, etc. Especially, it is necessary to inspect and replace key components such as screws, barrels, nozzles, etc., to prevent inaccurate injection volume caused by component wear and affect product dimensional accuracy. At the same time, it is necessary to calibrate the measuring device, pressure sensor, temperature sensor, etc. of the injection molding machine to ensure the accuracy of parameter measurement.

Environmental control: Factors such as temperature and humidity in the production environment can also affect the dimensional accuracy of injection molded medical device products. Maintain stable temperature and humidity in the production workshop to avoid changes in the properties of plastic raw materials due to environmental changes, as well as thermal expansion and contraction of molds and products. Generally speaking, the temperature in the production workshop should be controlled between 20 ℃ -25 ℃, and the humidity should be controlled between 40% -60%.

Online detection and feedback control: During the production process, online detection equipment is used to monitor the size of the product in real time, such as laser measuring instruments, coordinate measuring instruments, etc. Once the size deviation exceeds the allowable range, adjust the injection molding process parameters or correct the mold in a timely manner. By establishing a feedback control system, dynamic control of product size accuracy can be achieved, improving product consistency and stability.

Employee training and management: The skill level and operational standardization of operators also have a certain impact on the dimensional accuracy of products. Strengthen training for employees to familiarize them with injection molding technology and equipment operation, master correct debugging methods and quality control points. At the same time, establish a sound quality management system, strengthen supervision and management of the production process, ensure that employees strictly follow the operating procedures for production, and reduce dimensional accuracy problems caused by human factors.

Injection molded medical equipment products are medical devices and tools manufactured through injection molding processes, widely used in fields such as diagnosis, treatment, rehabilitation, and nursing. The injection molding process has become one of the key technologies in medical device manufacturing due to its high efficiency, precision, and ability for large-scale production.

Injection molding technology can manufacture medical devices with complex geometric shapes and fine structures, such as syringes, catheters, infusion sets, etc. Through precise mold design and injection molding processes, micrometer or even nanometer level precision can be achieved, meeting the high requirements of medical equipment for size and shape.