Stainless steel precision casting of pipe fitting flanges PED certificate.

Quick Detail:

• Stainless steel CF8 (SS304) investment castings for pipe fitting industry.
• Manufacturing Process: Silica Sol Lost wax casting;
• Wax type: Medium temperature wax;
• Weight: various from 0.05kg~15kg;
• Finish: Hand polished;
• CNC machined in house.

Description:

Custom made pipe fitting parts such as couplings, elbows, angles, Tee with CNC machining threads. These castings are manufacutred with Investment casting lost wax process. 

Overview of investment casting process:

• Wax tool making: Our wax tooling is made of each cooling and machining material: Aluminum.
• Wax injection: Feeding the entire wax die with molten wax, and get cooled, until a desired wax pattern is shaped and harden.
• Assemble the wax patterns: The wax patterns are welded to a runner system by a heated metal tool according to a certain pattern cluster(tree) design.
• Investment: The ceramic mould, known as the investment, is produced by three repeating steps: coating, stuccoing, and hardening. The first step involves dipping the cluster into a slurry of fine refractory material and then letting any excess drain off, so a uniform surface is produced. This fine material is used first to give a smooth surface finish and reproduce fine details. In the second step, the cluster is stuccoed with a coarse ceramic particle, by dipping it into a fluidised barrel, placing it in a rainfall-sander. Finally, the coating is allowed to harden.
• Dewax: The investment is then allowed to completely dry, which can take 16 to 48 hours. It is then turned upside-down and placed in a autoclave to melt out and/or vaporize the wax.
• Burnout & preheating: The mold is then subjected to a burnout, which heats the mold to remove any moisture and residual wax, and to sinter the mold. The mold is preheated to allow the metal to stay liquid longer to fill any details and to increase dimensional accuracy.
• Pouring: The investment mold is then placed cup-upwards into a tub filled with sand and be poured.
• Post treatment: In the following process, the shell is broken and removed, so the castings can be seen now. The castings are then cut off from the metal tree and shot blast/polished/machined to get better tolerance and surface. .

Specifications:

Competitive Advantage:

Winntington has strong technical support and full range of casting facilities and testing instruments to cater the growing precision casting business. We offer services from wax die making, wax injection, pouring, secondary machining, welding, heat treatment, polishing, to surface finishing etc.