chair base manufacturing process

Our chair base materials are aluminum.

Process Specifications

The process had to meet certain design and part constraints presented by:

Complex part geometry of the piece (curved edges, webbed bottom, etc.)

High quality surface finish

Flexible tolerance on majority of piece

Lower tolerance on bottom of base, where wheels connect to legs.

Flexible lead time

Small batch size (only about 300 pieces expected)

  Here below are manufacturing process that was ideal for the geometry and design specifications of our base.

Die casting is one of the most economical and quickest forming processes. The advantages of this production process are that hundreds of thousands of castings can be produced relatively quickly by using just one mold. All components produced have a uniform quality and involve relatively low unit costs.

Here below pictures and video are for Aluminum Office Chair Base manufacturing process:

Mold workshop

The die-casting mold is composed of two parts, the covering part and the movable part. The combined part is called the parting line. In hot chamber die casting, the covered part has a gate, while in cold chamber die casting it is an injection port. Molten metal can enter the mold from here, and the shape of this part matches the injection nozzle in hot chamber die casting or the injection chamber in cold chamber die casting. The movable part usually includes a push rod and a runner. The so-called runner is the channel between the gate and the cavity through which the molten metal enters the cavity. The covering part is usually connected to the fixed pressure plate or the front pressure plate, and the movable part is connected to the movable pressure plate. The cavity is divided into two cavity inserts, which are independent parts that can be removed or installed from the mold relatively easily by bolts.

supplier of chair base mold workshop

Die-casting workshop 

Die casting is a metal casting process, which is characterized by applying high pressure to the molten metal using the cavity of the mold. Molds are usually made of higher-strength alloys. This process is somewhat similar to injection molding. 

This picture and video is showing our manufacturing process for Raw chair base in Stacking too keep the chair base no scratching.

supplier of chair base Die casting workshop

Deburring

Deburring refers to the removal of very small microscopic metal particles on the surface of the work-piece. These particles are called burrs. They are formed during cutting, grinding, milling and other similar chip processing processes. In order to improve quality and service life, it is necessary to remove burrs on all metal precision parts. The surface, acute angles and edges of the work-piece must be extremely clean.

This picture is showing our manufacturing process for deburring

supplier of chair base Deburring

Polishing

Polishing refers to the use of mechanical, chemical or electrochemical effects to reduce the surface roughness of the workpiece to obtain a bright and smooth surface. It is the use of polishing tools and abrasive particles or other polishing media to modify the surface of the workpiece. During polishing, the high-speed rotating polishing wheel (circumferential speed above 20 m/s) is pressed against the workpiece, so that the abrasive can roll and roll the surface of the workpiece. Micro-cutting, so as to obtain a bright machined surface, the surface roughness can generally reach Ra 0.63 ~ 0.01 microns; when non-greasy matting polishing agent is used, the bright surface can be matted to improve the appearance.

These pictures are showing our manufacturing process for chair base polishing and waiting for polishing

supplier of chair base polishing and waiting polishing (1)

supplier of chair base polishing and waiting polishing (2)

Quality test

Test purpose: to evaluate the compressive strength of office chair bases and control the quality of products.

Test standard: ANSI/BIFMAX5.1

Technical specifications: Slowly load to 11120N(1134KGS) , hold for 1 minute, and release the force; then slowly load to 11120N(1134KGS) for 1 minute again, and record the test process.

Result evaluation: According to the standard operation, the chair base has no abnormality and does not break when the force is increased to 11120N(1134KGS), which meets the standard requirements.

This picture is showing our manufacturing process for Quality testing.

supplier of chair base Quality test

Packaging

Combining with the characteristics of the chair base and making full use of the form and beauty of the product shape,for example 5-star carton package.

This picture is showing our manufacturing process for 5-star base packaging.

supplier of chair base packaging