Semi-Permanent Molding
Step 1
First sand core placed in mold.
Note as the metal slide cores
in back of mold.
Step 2
Second sand core placed in mold. Note as the metal slide cores
in back of mold.
Step 3
Metal poured into the mold around the sand core and steel pull core. Solid casting ready for ejection.
Tubing can be cast in to the casting to save machining time and to improve the strength of the mechanical fastening.
Tubing can be cast in to the casting to create and strengthen passages, and reduce machining.
Aluminum Castings
Technical Information
Trega utilizes the permanent mold casting process in producing aluminum castings for their customers.
The specific aluminum alloys Trega offers include 319, 360, 355, 356, 356-T6, 357, 380 and 413. If you have a custom project, please contact Trega and we can discuss a solution.
Trega specializes in permanent mold castings that weigh from 1 ounce to 30 pounds. Our largest tilt pour casting machine can handle molds up to 40" x 42". Nonetheless, our engineering staff recently met a valued customer's production challenge by creating a 36" X 51" mold. Quantities range from 50 to thousands of parts annually. Cast temperatures range between 1,300 and 1,400 Fahrenheit.
Many complex parts can be created by the use of sliding mold sections and collapsible cores. Hydraulic cylinders actuate the slides. If the casting cannot be made with sliding mold sections due to undercuts we can use a sand shell cores to create geometry (AKA - semi-permanent mold castings). We can also cast-in inserts of many materials. Steel, brass, and stainless steel are the most common materials used.
There are multiple benefits of the permanent mold casting process including:
- Lower cost tooling than die casting
- High dimensional accuracy ( +/- .010" )
- Smooth finish (100-150 rms)
- Casting weight from 1oz. - 30lbs.
- Excellent mechanical properties
- Reduced machining
- Cast-in inserts
- Reduced porosity and inclusions
- Permanent mold castings can be
powder coated, anodized and heat treated