Manufacturing of Rotational Molding Molds

 

Rotational molding generally requires specific molds to determine the shape of the product. So how should a rotational mold be designed and manufactured? Below we will explain in detail, hoping it will be helpful.

 

Requirements for mold design and manufacturing: smooth surface; reasonable structure; high production efficiency; easy automation; easy to manufacture; long service life; low cost; the design should meet process requirements and be economically reasonable.

Structural design and parameter selection of rotational molds must take into account factors such as rigidity, guiding, stripping mechanism, positioning method, and clearance size. Unlike parts formed under high pressure, the components in rotational mold manufacturing are shaped under high temperature and rotational motion. Therefore, rotational molds do not need special processing to withstand heavy pressure like injection molds do. Wearing parts on the mold should be easy to replace. For plastic molds and die-casting molds, it is also necessary to consider a reasonable gating system, the flow state of molten plastic or metal, and the position and direction of entering the cavity. To increase productivity and reduce runner waste, multi-cavity molds can be used, allowing multiple identical or different products to be completed simultaneously in one mold. In mass production, molds with high efficiency, high precision, and long service life should be adopted.

 

For stamping dies, multi-station progressive dies should be used, and tungsten carbide insert progressive dies can be employed to extend service life. In small-batch production and new product trials, simple molds that are easy to fabricate, fast to produce, and low in cost should be used, such as combination dies, sheet metal dies, polyurethane rubber molds, low-melting-point alloy molds, zinc alloy molds, and superplastic alloy molds. Computer-aided design (CAD) has been introduced for mold design, meaning an integrated computer-based system is used to optimize mold design. This represents the development direction of mold design.

The manufacturing of rotational molds is classified by structural characteristics into planar blanking dies and spatial cavity molds. Blanking dies rely on dimensional coordination between the punch and die, sometimes even achieving zero-clearance fit. Other forming dies such as cold extrusion dies, die-casting dies, powder metallurgy dies, plastic molds, and rubber molds all belong to cavity molds, which are used to form three-dimensional shaped workpieces. Cavity molds have dimensional requirements in length, width, and height, resulting in complex shapes and difficult manufacturing. Mold production is generally single-piece or small-batch, with strict manufacturing requirements, often necessitating precision machining equipment and measuring devices.

Items No.	Exterinal dimension	Internal Dimension	Base Depth	Cover Depth
QBT9568325	950*680*325mm	860*600*250mm	170mm	80mm
QBT9568360	950*680*360mm	870*600*275mm	170mm	105mm
QBT9568615	950*680*615mm	870*600*540mm	460mm	80mm
QBT956865	950*680*650mm	870*600*565mm	460mm	105mm
QBT9650	900*600*500mm	810*525*420mm	360mm	60mm
QBT11545	1100*500*450mm	1030*420*375mm	315mm	60mm
QBT1256	1200*500*600mm	1130*420*350mm	250mm	100mm
QBT12860	1200*800*600mm	1120*720*525mm	430mm	95mm
QBT1067	1000*600*700mm	920*515*625mm	535mm	90mm
QBT1288	1200*800*800mm	1130*720*720mm	630mm	90mm
QBT1555	1500*500*500mm	1430*420*430mm	350mm	80mm
QBT1588167	1580*810*670mm	1510*730*595mm	495mm	100mm
QBT1865	1800*600*500mm	1720*515*430mm	350mm	80mm
QBT1866	1800*600*600mm	1730*515*530mm	450mm	80mm