Die casting tooling
The in-house tooling shop allows us to do the die-casting mold design, mold Fabrication & mold maintenance in the same workshop.
Our mold engineers will review your drawings and propose suggestions by mold flow analysis, which can help you prevent potential issues or risks that may happen in later production.
B) Aluminium Die Casting
NingBo HongZhe PMI has been focusing on precision aluminum die casting. It’s worth saying we own a remarkable engineering team with over 23 years of professional die casting experience. This enables us to provide excellent technical support to customers.
We produce precision die-cast components and products with our promised lead times in the industry. To ensure high-quality products and processes, we continuously implement the latest technologies.
2、Vacuum Casting - Urethane Casting
HongZhe PMI is fully capable of handling your vacuum casting and plastic Injection molding needs. With years of expertise in the field, we can fabricate your plastic parts to the highest standard, as well as cost-efficient and with fast turnarounds.
Vacuum casting is a great method to make rigid or flexible parts, and is ideal for high quality prototypes, function testing, concept proofing and display demos.
Advantages of Vacuum Casting
Low cost & Repeatability
Cast urethane parts are made of cheap silicone molds, eliminating the need to invest in expensive and time-consuming metal tooling. Up to 50 functional cast urethane parts can be produced in 10 to 15 days
Wide selection of materials
Urethane casting materials range from soft and flexible to rigid and impact-resistant, also provides end-use parts with fine details of production-level quality.
Color Options
Urethane casting can provide better surface quality compared with CNC prototyping or 3D printing, as well as colored and clear
How Vacuum Casting Works?
| Step 1: Master building | We can paint parts surface for texture or satin effect to simulate the final mold texture of the product. Thesilicone molds will copy the details and textures from the original master, so the cast urethane parts wilcome out the same as the master without any extra finish on the surface. Casting molds are made from liquid silicone resin, also known as RTV molds. The chemical stability, self-re-leasing properties and flexibility of silicone rubber are excellent that it gives minimal shrinkage and carriesfine details effectively from master to mold.The silicone mold making steps are as follows: Paste tape in flat position around the master, so that it is easy to open the mold later, which will also becomethe parting surface of the final mold. |
| Step 2: Mold making | The master model is suspended in a box and place plastic rods to set gates and vents. Silicone is poured around the master and vacuum is used to remove all air. This then is cured in an oven, at atemperature of 40℃. lt generally takes 8-16 hours depending on the volume of the mod. Once the silicone rubber is cured, remove the master from the silicone to form a cavity and the silicone mold is made. |
| Step 3: Cast the parts | The process of vacuum casting parts is as follows: First, put the silicone mold into the oven and preheat it to 60-70°℃. It is very important to choose a suitable release agent before closing the mold and use it correctly to avoidstickiness and surface defects. Then prepare the polyurethane resins to preheat it to about 40℃ before use. Mix two-component resins in exact proportions, and then fully stir and degas for 50-60 seconds undervacuum. The resin is poured into the mold inside the vacuum chamber under computer control, and cured again inthe oven. Average cure time: 1-3 hours for small parts and 3-6 hours for big parts. Remove the casting partfrom the silicone mold after curing. Prepare to repeat this cycle. |
The urethane casting process has three steps: master pattern, molding, and casting
