Sand precision casting bronze parts

The accuracy of the casting is limited by the type of sand and the molding process. Sand castings made from coarse green sand impart a rough texture to the surface, and this makes them easy to identify. Castings made from fine green sand can shine as cast but are limited by the depth to width ratio of pockets in the pattern. Air-set molds can produce castings with smoother surfaces than coarse green sand but this method is primarily chosen when deep narrow pockets in the pattern are necessary, due to the expense of the plastic used in the process. Air-set castings can typically be easily identified by the burnt color on the surface. The castings are typically shot blasted to remove that burnt color. Surfaces can also be later ground and polished, for example when making a large bell. After molding, the casting is covered with a residue of oxides, silicates and other compounds. This residue can be removed by various means, such as grinding, or shot blasting.

General

Casting

	MAIN PARTICULARS
Material for product	carbon steel, alloy steel, stainless steel, aluminum alloy, zinc alloy, brass, gray iron, nodular cast iron, ductile Iron or other specified
Standard	ASTM, ASME, DIN, JIS, ISO, BS, API, EN
Certificate	ISO9001, BV
Dimension	As per drawing, as large as we can
Processing	Step1:investment casting, Lost wax Casting , sand casting Step2:turning , milling, drilling, grinding, threading, CNC Machining
Finishing surface	Machined surface with tectyl891, anodize, polishing, nickel plating, zinc plating and chrome plating, oxidation, powder coating, painting, etc.
Inspection	material, construction, dimension, heat treatment, hardness, NDT
Quality	ISO9001, BV, control production

Construction

The construction is to be built according to the drawing with rules of good workmanship.

Materials

All fabricated steelwork used in the construction of the pump cover will be to manufacturing standard of UniSite or other classification society.

All materials proposed will be selected to comply with the latest Health and Safety Rules.

Paint systems for protection will be of the highest quality (Hempel, Inter, Sigma, Jotum)

Machined surface will be of the highest quality(Tectyl891)

Basic process

There are six steps in this process:

1.Place a pattern in sand to create a mold.

2.Incorporate the pattern and sand in a gating system.

3.Remove the pattern.

4.Fill the mold cavity with molten metal.

5.Allow the metal to cool.

6.Break away the sand mold and remove the casting.

Photos of our OEM casting sand bronze component

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