Unscrewing Molds

Surface Finishing – Polish / Texture

Surface finishing is a key quality control process in unscrewing mold. Since the products produced by rotary molds usually have complex thread structures, their surface finishing not only affects the product’s appearance but also directly relates to the functionality and service life of the threads. Surface treatments may include polishing, plating, sandblasting, and coating to achieve smooth, burr-free, and high finish. These treatments improve the wear and corrosion resistance of the product, ensuring that the threads are smooth and durable in use.

Parting Line Design of Unscrewing Molds Parts

In the unscrewing molds, the parting line design of the product is one of the key factors in mold design. The parting line is the contact line between the two mold parts (the mold cavity and the core) when they are closed. For unscrewing mold, the parting line design needs to be particularly fine to ensure that the threaded part of the molded product does not have any misalignment or burr. Reasonable parting line design can effectively avoid mold fretting during the injection molding process, and at the same time ensure the thread accuracy and the product’s surface quality.

Draft Angle Analysis of Unscrewing Molds Parts

During the draft angle analysis in the unscrewing mold, we found that the green surface of the marking 1 cavity side was not designed with any draft angle and to ensure smooth demolding and reduce wear on the mold, we recommend adding 1 degree of draft angle to the green surface of the cavity side and removing the excess material during machining. draft angle on the green surface of the cavity side and remove the excess material during the machining process.

Similarly, the green surface of the core side at point 2 does not have a draft angle, and we recommend adding a 0.5- degree draft angle to the green surface of the core side and removing the corresponding material during machining. Through this adjustment, the demolding effect of the product can be significantly improved, the damage to the thread structure during demolding can be reduced, and the service life of the mold can be prolonged to improve production efficiency and product quality.

Slider and Lifter Design

Slider & lifter design ensures the smooth demolding of complex structures in the unscrewing mold. First, the blue line in the 1 place indicates the slider’s parting lines. Proper design of the parting line helps to avoid unnecessary stress concentration and flying edges during the demolding process, thus improving the quality of the finished product. Secondly, in the 2 place, it is necessary to remove the C chamfer for slider demolding, Remove the C chamfer can reduce the friction and resistance of the slider during demolding, make sure that the slider can move smoothly, and avoid the surface of the product from scratches or damages.

Lastly, the unscrewing structure could not be designed at location 3 due to space constraints, which meant that the product could not be demolded by a conventional rotating mechanism in this area, and an alternative slider or lifter structure needed to be designed to ensure that the product could maintain its precise geometry and thread integrity during the demolding process. Through the fine design of sliders and ejector bars, the demolding of complex geometries can be effectively solved, improving productivity and product quality.

Ejector Design of Unscrewing Molds Parts

When designing and arranging the mold ejector system, we considered using a variety of ejector pins to ensure the smooth demolding of the plastic products. Specifically, we used the following ejector pin sizes: Ø4 ejector pin *2, Ø4 ejector pin *2, and Ø10 ejector pin*2. In addition, we used 29.5 flat ejector pin *22 and 1.57.5 flat ejector pin*2. The combination and distribution of these ejector pins helps to ensure that the product is subjected to an even force during demolding, reducing the risk of deformation and damage, thus improving productivity and product quality.

Gate Type & Location & Size

In the plastic injection molding process, gate type, location and size are key factors in determining the quality and productivity of the molded product.

Reasonable unscrewing molds design is the basis for achieving high-quality injection molding. By optimizing various aspects such as cavity and core layout, gating system, ejector system, cooling system, parting surface, and venting system, the working efficiency of the mold and the quality of the product can be improved. The mold layout design needs to take into account the shape, size, material properties, and production requirements of the electronics housing, to achieve the best production results.

Before delivery, we will fully maintain and clean the molds to make sure the surface of the molds are smooth and internal impurities. Then anti-shock material and protective padding are packed and put into wooden crates and labeled with model and quantity information.