With the improvement of technical requirements, the dem […]
With the improvement of technical requirements, the demand for medical device mould quality is constantly increasing. Therefore, when we re-manufacture moulds, we need to improve the quality of the moulds as much as possible. The following are the five ways that China Standard Parts Network can share to improve mould quality.
1. First of all, the design of the parts should be reasonable, and the appropriate structural scheme should be selected as much as possible. The designer of the parts should consider the technical requirements and the structure of the parts must conform to the manufacturability and feasibility of the medical device mould manufacturing.
2.The design of the medical device mould is the most important step to improve the quality of the mould.Many factors need to be considered, including the selection of the mould material, the usability and safety of the mould structure, the processability of the mould parts and the convenience of mould maintenance. These should be considered as carefully as possible at the beginning of the design.
①The selection of medical device mould materials not only needs to meet the customer's requirements for product quality, but also needs to consider the cost of the material and its strength within a set period, of course, according to the type of mould, the working method, the processing speed, and the main failure form And other factors to select materials. For example: the main failure mode of the punching die is blade wear, you must choose a material with high surface hardness and good wear resistance; the stamping die mainly bears periodic loads, which is likely to cause surface fatigue cracks and lead to peeling of the surface layer. The material with good surface toughness; the material with a particularly low friction coefficient should be selected for the drawing die; the die-casting mould should be selected for the material with strong thermal fatigue due to the cyclic thermal stress; for the injection mould, when the plastic parts are ABS, PP, PC For such materials, the mould material can be pre-hardened and tempered steel. When the plastic parts are high-finish and transparent materials, corrosion-resistant stainless steel can be selected. When the batch of products is large, quenched and tempered steel can be selected. In addition, it is also necessary to consider the use of mould materials with low affinity to the parts to prevent the mould from aggravating the wear of mould parts and affecting the quality of the mould.
② When designing the medical device mould structure, try to make the structure compact and easy to operate, and also ensure that the mould parts have sufficient strength and rigidity; when the mould structure allows, the corners of the surfaces of the mould parts should be designed as round corners to avoid stress concentration ; For the concave mould, cavity and part of the punch and core, the combined or mosaic structure can be used to eliminate the stress concentration. The elongated punch or core needs to take appropriate protective measures on the structure; for the cold punch, it should be Equipped with devices to prevent clogging of parts or waste materials (such as: ejector pins, compressed air, etc.). At the same time, we must also consider how to reduce the impact of sliding fittings and frequent impact parts on the quality of the mould caused by long-term wear.
③ In the design, the range of disassembly and assembly must be reduced when repairing a part, especially when the wearing parts are replaced, the disassembly and assembly range should be reduced as much as possible.