In the field of plastic injection mold design, every detail can determine the success or failure of the final product, and the selection and design of the parting surface is a pivotal link. Proper design of the parting surface is a crucial prerequisite for creating high – quality injection molds and producing top – notch plastic products. Below we will talk about design principles of parting surface.
The Core Consideration: Parting Surface in Mold Design
When starting to design a plastic injection mold, the choice of the parting surface is undoubtedly a critical decision. A well – chosen parting surface can greatly simplify the overall structure of the injection mold. It makes the molding process of plastic products smoother and the demolding operation easier, thus effectively safeguarding product quality.
On the contrary, if the parting surface is selected improperly, the structure of the injection mold will become extremely complex. This will significantly increase the difficulty of plastic product molding and ultimately affect product quality. Therefore, the choice of the parting surface plays a pivotal role in the design of the injection mold structure.
The Six Golden Principles for Parting Surface Design
- Maximum Cross – Section Principle: The Guarantee for Smooth Demolding
The parting surface should be located at the maximum cross – section of the product. Designing the parting surface as the maximum cross – section of the product provides sufficient space and convenience for the demolding process, ensuring that the plastic product can be demolded without any obstacles. - Demolding – Facilitating Principle: The Secret to Mold Release
The selection of the parting surface should facilitate demolding. Since the parting surface is usually designed on the movable half – mold, when the injection mold is opened, the plastic product will shrink and tightly wrap around the core of the movable mold. The ejection system is generally also designed on the movable mold. By setting the parting surface in an appropriate position, the mold can be released more easily with the help of the ejection system. - Appearance – Matching Principle: The Key to Avoiding Defects
The choice of the parting surface must conform to the appearance requirements of the plastic product. If chosen improperly, flash is likely to occur during the injection molding process. This flash will seriously affect the appearance quality of the plastic product, reducing its aesthetics and market competitiveness. - Precision – Ensuring Principle: Meeting Coaxiality Requirements
The choice of the parting surface should ensure that it can meet the precision requirements of the plastic product. For parts with coaxiality requirements, they should be designed on the same side as much as possible. This can effectively reduce the precision deviation caused by improper parting surface settings and ensure the performance and quality of the product. - Manufacturing – Friendly Principle: Reducing Processing Difficulty
When selecting the parting surface, the manufacturing process of the injection mold should be fully considered. If the parting surface is chosen unreasonably, it will greatly increase the processing difficulty of the injection mold, leading to higher production costs and longer production cycles. Therefore, a parting surface that is easy to manufacture should be selected to improve the production efficiency and economy of the mold. - Venting – Assisting Principle: Avoiding Air Entrapment
The choice of the parting surface should also be conducive to the venting of the injection mold. The front end of the melt is not suitable as a parting surface because it will lead to poor ventilation, which in turn will cause air entrapment and combustion inside the plastic product. By reasonably setting the parting surface, a smooth exhaust channel can be provided for the gas inside the mold, ensuring the smooth progress of the injection molding process and the stable quality of the product.
In the design of plastic injection molds, the design principles of the parting surface are like a precise key. Only by mastering these principles can we open the door to high – quality molds and excellent plastic products. I hope today’s sharing can give you a deeper understanding of the design of the parting surface in plastic injection molds.
