Advanced Surface Design of Office Chairs
The advanced surface design of office chairs is primarily achieved through 3D modeling technology, with core steps including frame modeling, cushion and backrest surface generation, and detail optimization. A typical case can be referenced from the integrated surface structure of the Henglin Xingyun computer chair.
Frame Design: The Foundation of Structural Support
The frame is the mechanical core of an office chair, and its modeling must balance strength and lightweight construction. First, the path curve of the frame is drawn using a 3D sketch, which must conform to the natural curvature angles of the spine and legs in ergonomics to ensure stability during use. Subsequently, the cross-sectional shape of the frame (such as elliptical or streamlined) is defined using a 2D sketch, and a solid model of half the frame is generated along the path using the sweep function. To enhance structural strength, cylindrical connectors are added at the ends of the frame (for fixing the chair legs), and transverse connecting rods are embedded in the middle to distribute pressure. After completing the modeling of one side, a symmetrical complete metal frame is generated through mirroring operations to ensure balanced force distribution on both sides.
Cushion and Backrest Surfaces: The Key to Body Fit
The surface design of the cushion and backrest directly affects comfort and must achieve precise fit through multi-sketch lofting. The specific steps are as follows:
- Sketch Drawing: Create four key sketch lines (usually spline curves or arc lines) to define the contours of the front edge, rear edge, top, and bottom of the cushion and backrest. These curves must be adjusted in curvature based on human pressure distribution data. For example, the front edge of the cushion should be slightly raised to reduce pressure on the legs, and the top of the backrest should extend backward to support the scapulae.
- Surface Generation: Use the loft function to connect the four sketch lines into a half-surface, adjusting the smoothness of the surface by controlling guide lines to avoid sharp edges. After mirroring to generate a complete surface, it needs to be thickened (usually 5-10mm) and rounded (radius 2-5mm) to eliminate stress concentration points.
- Ergonomic Verification: Obtain real human data through 3D scanning technology, compare the fit between the surface and the human curve, and optimize local curvatures (such as the lumbar support area needing to protrude by 2-3cm).
Detail Optimization: Enhancing Functionality and Aesthetics
Detail design is the finishing touch of advanced surfaces and must balance practicality and visual appeal:
- Chair Leg and Armrest Modeling: Chair legs usually adopt a five-claw star-shaped structure, generated through rotational arraying. Armrests need to smoothly connect with the backrest surface to avoid gaps.
- Double-Layer Structure Cushion: Copy the cushion surface and offset it outward by 2-3mm to generate a double-layer structure, filled with high-elasticity foam in the middle to enhance support and improve breathability.
- Surface Treatment: Add details such as dents and textures (such as imitation leather embossing or fabric mesh), and eliminate burrs through chamfering commands (radius 0.5-1mm) to improve tactile feel.
Practical Application Case: The Henglin Xingyun computer chair adopts a 'body-flow line support design', with its backrest and seat connected through an integrated surface. The surface curvature is optimized based on 100,000 sets of human data, dynamically adapting to different sitting postures and improving pressure distribution uniformity by 30%. It is a typical representative of advanced surface design.
