Feasibility Analysis of Medical Injection Molding Part Shape and Structure
The shape of medical
injection molding parts is a major factor determining the mold's machining accuracy, the number of mold cavities, and mold life. Shibang Plastics engineers design a reasonable number of mold cavities based on the product's appearance, structure, and shape during mold opening to meet the machining accuracy requirements of medical injection molding parts, improve production efficiency, reduce production costs, and ensure on-time and quantity delivery to customers.
Analysis Elements:
Combining product functional requirements, 2D drawing tolerance requirements, external requirements, molding machine requirements, and key points of the molding material characteristics, the design must consider the need for mold shrinkage allowance while meeting functional and dimensional requirements. Compensation calculations should be performed on the mold in areas with large deformation or shrinkage, and steel space should be reserved in advance as much as possible.
Medical Mold Opening
Medical injection molding part structure: Simply put, it involves a demolding structure that is inconsistent with the mold opening direction of the injection molding part. Lateral core-pulling movement is required to achieve normal demolding of the medical injection molding part.
Analysis Elements:
Ensure the reliability of the parting surface of the mechanism, minimizing the presence of thin or sharp iron sections, as these are prone to deformation or breakage during operation due to prolonged movement and increased temperature.
After designing the moving structure, 3D motion simulation is necessary to check for potential safety hazards and interference.
Medical Injection Molding Molds
2. Analysis of Hole, Groove, and Thread Elements in Medical Injection Molding Products
First, understand the assembly requirements, 2D dimensional tolerance requirements, and torque requirements for holes, grooves, and threads. Regardless of whether it's the fixed mold or the moving mold, inserts are generally used in mold processing to ensure machining accuracy and facilitate maintenance.
3. Deformation and Misalignment Analysis of Medical Injection Molded Parts
Especially for thin-walled, narrow, long, precision injection molded parts, and products with high clamping forces, it is necessary to consider the potential for concavity, bulge, warping, bending, and twisting during molding before design. Therefore, it is crucial to prepare modification plans in advance, including optimization of the gating system, temperature control system, mold correction methods, and material property improvements. Taking effective measures in advance can minimize risks.
Fanack High-Speed Machine
4. Overall Motion Interference Analysis After Mold Design for Medical Injection Molded Parts
Especially when the product structure includes sliders and angled ejectors, motion interference analysis should be conducted in conjunction with the ejection mechanism. Sometimes, in the case of a three-plate mold with a narrow sprue, interference during part removal should also be analyzed in conjunction with the elements of the injection molded part. If a robotic arm is used for part removal, should there be interference between the guide pillars, tie rods, and the dispensing gate?
Under normal circumstances, during the T0 trial molding process, defects such as flow marks, shrinkage marks, insufficient filling, silver streaks, obvious weld lines, and trapped air are prone to appear on the outside of the product. The problems mentioned above with T0 molding can generally be identified during the initial mold flow analysis. If time permits, performing mold analysis beforehand can address these issues.
6. Batch Production Factor Analysis for Medical Plastic Parts A good product outcome is achieved through batch production, requiring consideration of the three key molding factors: temperature, pressure, and time.
The impact of plastic materials on mold steel during batch production. For example, for materials like POM and PA66, mold steel with good corrosion resistance should be used.
Analysis of the wear resistance of steel during structural movement. Ideally, two different types of steel with varying properties should be used for movement to prevent chemical reactions during operation that could cause the same type of steel to wear out easily.
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