Office Chair Tray Production

There are currently no publicly available standard detailed steps for producing office chair trays, which typically require a combination of industrial processes such as machining, mold design, and material forming, making it difficult for individuals to produce them manually.

1. Material Selection and Preparation

The core function of an office chair tray is to support the seat and connect to the gas lift, requiring high strength and durability. Common materials include engineering plastics (such as PA66+GF30, i.e., nylon 66 with 30% glass fiber) or metals (such as aluminum alloy). Plastic trays require injection molding and corresponding molds; metal trays require stamping or casting molds. Materials should be selected based on load-bearing requirements (e.g., ordinary office chairs typically bear about 100-150kg) and should comply with environmental standards (such as ROHS certification).

2. Mold Design and Manufacturing

The shape of the tray must match the bottom structure of the seat, typically including a central hole (for installing the gas lift), edge clips (for securing the seat cushion), and reinforcing ribs (to enhance strength). Plastic trays require injection molds, with the parting surface considering draft angles (usually 1°-2°) to avoid adhesion; metal trays require stamping molds, with material springback calculated to ensure dimensional accuracy. Mold manufacturing should be entrusted to professional manufacturers, with a cycle of about 2-4 weeks and costs accounting for 30%-50% of the total tray cost.

3. Forming Process

• Plastic Trays: Injection molding machines are used to inject heated and melted plastic pellets into molds, which are then cooled and ejected. Key parameters include injection pressure (80-120MPa), holding time (5-10 seconds), and mold temperature (80-100℃), which need to be adjusted through trial molding to avoid shrinkage or burrs.
• Metal Trays: Aluminum alloy trays are typically formed through high-pressure casting (pressure 200-500MPa) and require subsequent deburring and surface treatment (such as sandblasting or anodizing); steel trays require stamping followed by welding of reinforcing structures, ensuring weld strength complies with standards (such as ISO 12944 corrosion resistance grade).

4. Assembly and Testing

The tray must be assembled with seat chassis, gas lifts, and other components, using specialized tools (such as torque wrenches) to ensure screw tightening torque meets requirements (e.g., M6 screw torque of 6-8N·m). Finished products must pass static load tests (continuous loading of 150kg for 24 hours without deformation) and dynamic fatigue tests (100,000 lifting cycles without damage), with some high-end products also requiring certification from BIFMA (Business and Institutional Furniture Manufacturers Association) standards.

5. Alternative Solution Recommendations

For low-cost solutions, consider purchasing finished trays (priced around 20-80 yuan each, depending on material) for modification or contacting furniture repair shops for custom metal brackets. For individual production, it is recommended to start with simple metal trays using angle iron and steel plate welding, but pay attention to safety precautions (such as wearing goggles) and ensure structural stability.