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Dah Shi - An Stainless Steel Handrail Fitting Expert

  • Components and Fittings
  • Components and Fittings

Dah Shi, has over 30 years of stainless steel railing accessory manufacturing experience nationwide and a complete line of handrail fittings that have been developed to meet various building and constructions' railing requirements. Various types, styles and sizes of stainless steel handrail fittings are available for handrail uses in buildings, institutions and outdoor facilities. Numerous styles, quality polishing, welding and prompt delivery give you the most versatility of railing accessories.

Stainless Steel Railing Components and Fittings Customization

  • Components and Fittings
  • Components and Fittings

Dah Shi now serves many Original Equipment Manufacturers (OEMs) by meeting their complex handrail fitting needs in a timely and cost effective manner and offers an extended high quality product range which they are able to sustain through continued high grade testing. Their manufacturing capability have enabled them to bring out more than one hundred various designs each year and become one of the major stainless steel railing accessory suppliers in Taiwan.

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Stainless Steel Components and Fittings Manufacturing Flowchart

Stainless steel components and fittings manufacturing flowchart - die design of handrail fittings

1. Die Design of Handrail Fittings

Team of dedicated professionals at Dah Shi work closely together with their customers from the design stage through final qualification ensuring that both the die and final product meets all of their requirements. The handrail accessory designers work with their die makers throughout the design and fabrication of the die using the latest industry standard software. The Computer-Aided-Manufacturing (CAM) is capable to read data files and generates complex molds efficiently assists in providing accurate, low cost injection molds. Our engineers help to determine the cast-ability of the handrail fitting design, and suggestions may be made to improve casting design or performance. The engineers are also fully conversant with production processes, and their presence in the factories provides continual support during production. No matter what your source drawing is, our engineer can transform your drawing to solid model. This solid drawing enables you to see the final profile of stainless steel railing accessories.

Stainless steel components and fittings manufacturing flowchart - wax pattern making - injection of melted wax

2. Wax Pattern Making - injection of melted wax

Wax replicas of the desired castings are produced by injection moulding using a metal die. Melted wax is injected into the die, creating an exact wax replica of the part. One wax pattern must be injected for every finished part. In the case of a prototype, a heat disposable pattern is generated using a CAD file.

 
Stainless steel components and fittings manufacturing flowchart - wax pattern assembly

3. Wax Pattern Assembly

The casting process begins by production a wax pattern employing a precision mold. The wax patterns are fastened by the gate to a runner to form a cluster. The cluster is dipped in refractory slurry and coated with fine sand then dried. The process of dipping and drying is repeated until a robust thickness is achieved. After this, the ceramic shell is heated, and the wax is melted away. These patterns are attached via a "gate" to a central wax stick, referred to as a "tree" or "sprue", to form a casting cluster or assembly, and mounted on a pouring cup.

Stainless steel components and fittings manufacturing flowchart - shell building

4. Shell Building

A shell is built by immersing the assembly in a liquid ceramic slurry and then into a bed of extremely fine sand. Several layers may be applied in this manner.

 
Stainless steel components and fittings manufacturing flowchart - dipping and drying

5. Dipping and Drying

The process of dipping and drying is repeated until a robust thickness is achieved. After this, the ceramic shell is heated, and the wax is melted away. This leads the mold into a cavity that can be filled with the molten metal.

 
Stainless steel components and fittings manufacturing flowchart - dewaxing

6. Dewaxing

The hollow mold is fired, and the liquid alloy is poured into the pre-heated mold. After the metal has solidified, the slurry shell is broken off and the individual part is cut away from the connecting gates. The parts are cleaned and subjected to further secondary operations.

 
Stainless steel components and fittings manufacturing flowchart - melting and pouring

7. Melting & Pouring

The shell is filled with molten metal using various techniques and, as the metal cools, the parts, gates, tree and pouring cup become a solid casting.

 
Stainless steel components and fittings manufacturing flowchart - knock  out and cleaning

8. Knock Out & Cleaning

When the metal has cooled and solidified, the ceramic shell is broken off by vibration or water blasting.

A metal melt casting apparatus comprises a vessel for containing the melt and having a wall portion having a downwardly pointing melt tapping hole, the vessel tilting so that this wall portion can be raised and lowered. A fountain has a top for receiving the melt when registered with said tapping hole and a bottom for connection with the bottom of a mold. A gas-tight elastically deflectible sealing means interconnects the tapping hole and the fountain top when the mentioned wall portion is lowered thereon by tilting of the vessel. The sealing means is made in the form of two parts which elastically flexibly engage when the converter wall with the tapping hole is lowered on the top of the fountain, one part being connected to the wall and the other part being connected to the fountain. The sealing means is provided with a gas passage so that the tapping metal stream may be subject to evacuation for degassing or surrounded by an inert gas.

Stainless steel components and fittings manufacturing flowchart - cutting

9. Cutting

The parts are cut away from the central tree using a high speed friction saw.

 
Stainless steel components and fittings manufacturing flowchart - finishing

10. Finishing

Minor finishing operations, such as polishing, fettling and grinding, are undertaken to produce a metal casting identical to the original wax pattern.

 

You will receive the industry's most consistent service and handrail fitting quality. This consistency is the result of establishing and enforcing standardized policies, practices and systems for all of our operating facilities. This enables customers to know exactly what to expect from Dah Shi no matter which plant they work with anywhere in the world.

metal handrail production process
Step1. Raw material assay → step2. 整型 → step3. Lathe → step4. Parts assembling → step5. Polish → step6. Clean → step7. QC → Step8. Packaging
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go to product pageCheck out railing accessories: rail elbows, stainless flanges, rail adapters, ball fittings, slip on fittings, flush fittings, rail end caps, square fittings and rail brackets, etc.

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