Raw Materials Selection
- Resin: Phenolic is a preferred material due to its high heat resistance, high strength, as also having a high bonding with grains. The basis on which the resin is also chosen is on its curing. The curing is necessary in a bid to achieve pre-coated sand properties that are desirable.2.
Pre - coating Process
- Mixing: The resin is mixed with sand in a high-speed mixer. A specified amount of a hardener is also added in mixing. The speed as well as mixing time is also regulated in order to have a homogenous coating of grains with the resin. The mixing is, for example, conducted at a speed between 1000 - 1500 revolutions per minute for 3 - 5 minutes.
- Curing: The pre-coat sand is then heated at high temperature (between 150 - 200°C in order to initiate the curing reaction in the resin. The operation is carried out in a fluid bed or in a dry rotary in order both to heat homogeneously as also to cure resinated sand.
Molding
- Pattern making: The high-accuracy pattern is made according to castings design specification. The pattern is made from wood, metal, or plastic as a matter of production level as well as component complexity.
- Molding Method: Pre-coated sand is charged into moulding flask above pattern. The pre-coated sand is then pressed with jolting, squeezing, or vibration methods in order to pack a firm levelled mould with sand. Compaction is necessary in order not to have defects in casting both in terms of porosity as well as shrinkage.
Casting
- Melting: The suitable material alloy, i.e., carbon steel, stainless steel, or ductile iron, is melted in a furnace. Melting heat as well as time is tightly controlled in a way that molten metal will have a suitable fluidity as well as a suitable chemical composition.
- Pouring: The metal is cast into mould in a rate which is also in control as also a temperature which is in control. There is a measure taken in pouring not having defects in cast that can be induced by turbulence.
Post - processing
- Shakeout: The cast is shaken out from its mould once it is cool and hardened. Some machinery is also in a configuration that is known as shakers in some cases, as is also some shakeout with human power.
- Finishing: The cast is then treated with a series of activities in finishing, i.e., heat treatment, machining, and grinding. The surface is cleaned from its rough surface or flash through grinding, whereas machining is carried out in a bid to achieve necessary dimensional accuracy. The heat treatment can be made to boost some mechanical properties in the cast, i.e., toughness and hardness.
Quality Control
- Inspection: The castings are inspected at over a single stage in manufacturing. Some non-destructive methods which are also made use of in order to inspect internal defects are ultrasonic examination, magnetic particle examination, and X-ray examination. Dimensional examination is also made with precision instruments in order to have castings in design specification.
- Certification: Petroleum application castings are also supposed to meet stringent industrial requirements as also certificates, i.e., those specified by the American Petroleum Institute (API). The manufacturing is also captured in traceability as also conformity with these requirements.
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