Centrifugal Casting Process│LAWAI Industrial Corporation

Production Flow

Metal Melting

The materials used to manufacture the components in LAWAI are not only the standard grades but also the unique alloys designed by our R&D. After deciding the material, the procedure of metal melting begins- Meting > deoxygenation > degasification > deslagging...

Component Analysis

The elements test is analyzed by two spectrometers in LAWAI. We use them to do the elements analysis for the metal liquids in every furnace and buildup of standard test pieces.

Centrifugal Casting

The centrifugal casting team in LAWAI sets the precise parameters depending on different grades, sizes of inner and outer diameters, temperatures of furnaces and other factors before manufacturing the high-quality tubes/pipes by centrifugal casting technique.

Casting Out

After the molten metal is pouring into the rotating mold with high speeds, there is a continual solidification from the outer wall to the inner surface when cooling. This makes the uniformity of the microstructure of material.

When the casting tubes/pipes are taken out, our quality control team is going to mark the tracing number on the surfaces of the tubes/pipes.

Heat Treatment

LAWAI has a small Heat Treatment Department and also cooperates with other professional heat treatment factories for various materials and sizes of tubes/pipes.

Heat treatment is the essential part during centrifugal casting process. The main purpose is to change the microstructure of the centrifugal casting material and form the mechanical, physical, chemical properties that are necessary for actual applications.

Tube Cutting

The engineers of Cutting Department in LAWAI are able to cut the tubes/pipes to various sizes based on customers’ needs. The largest diameter of tubes/pipes that can be cut is 1000mm and it is not restricted by their thicknesses.

In order to meet the demands for the unique tubes/pipes, we are going to expand the scale of the manufacturing equipment and keep on doing the research of the cutting field.

Machining

The Machining Department of LAWAI is equipped with plenty of machining facilities. We are able to do the rough / finish machining on the centrifugal casting components, rollers and tubes/pipes of different sizes- The largest outer diameter of those can be 2100 mm and the longest length can be 6000mm.

Delivery

Before shipping, the customized tubes/pipes or other centrifugal casting components are packed into standard wooden cases.

Centrifugal casting is an economical option if customers are looking for tubing with the hollow hole.

Since lots of customers have the demands of cylindrical tubes and they still did not know the centrifugal casting process, they used to purchase the round shaped bars.

Those round bars are produced by the solid metal in the form of a billet. The billet would be heated and shaped with the strong forces. In order to get the hollow center, the center of the bars would be machined away. Through the complicated process, the high quality tube is formed but the price is much higher compared with centrifugal casting process. In the point of view of environmental protection, it is also not a friendly manufacturing process. It would generate the chips that are regarded as the waste. The waste could cost much due to different alloy characteristics.

In addition to round bar, conventional or static casting is one of the casting methods that can not be compared with centrifugal casting process.

In the static casting process, the molten metal would be poured into ceramic or stationary sand mold. The metal would shrink when it cools and solidifies from the top and the bottom. The voids also form during that process. Thus, the component made by static casting method has the shrinkage voids and gas holes.The quality is not as good as those manufactured by centrifugal casting process.

In the centrifugal casting process, the molten metal is poured into the mold that would be spun at high speed usually around 50 to 100 times gravity force. When the outside mold is cooled by water. The solidification takes place as the thin layer at the outside diameter. And it builds a layer by later towards the hollow bore. Since the solidification is directional, shrinkage voids move to the bore and are eliminated. Also, the less dense materials like slag and impurities would flow into the inner diameter during the higher speed rotation, they are easily to be removed by machining. In the end, the high quality tubular parts with fine grain structure are formed.

Castings manufactured through centrifugal casting process is one-piece construction.

The castings have superior mechanical properties due to the the fine grain structures, free shrinkage due to the directional solidification, free impurities due to the high G force when spinning.