Manufacturing of components such as frames, wheels, and seats.
1. Frame Manufacturing
The frame needs to withstand the weight of the baby (approximately 15-25 kg) and the stresses of daily folding. This generally involves metal frames and plastic supports:
1.1 Manufacturing of metal frames, used as the main frame.
1.1.1 Raw material preparation: Select 6061-T6 aluminum alloy tubing or carbon fiber composite materials. Material testing is required, such as tensile strength and yield strength tests.
1.1.2 Cutting and bending: Use a CNC cutting machine to cut the tubing to the specified length, with an error of ≤0.5mm. Then, use an automatic pipe bending machine to bend the pipes according to the design drawings, ensuring that the curvature and angles of the pipes meet the requirements.
1.1.3 Welding and grinding: Use laser welding or argon arc welding. After welding, use a belt sander to grind the welds, ensuring a surface roughness Ra ≤ 1.6 μm and that there are no cracks or pores in the welded area.
1.1.4 Surface treatment: The metal frame requires anodizing, electroplating, or painting.
1.2 Manufacturing of plastic supports, used as auxiliary components, such as seat supports and wheel guards.
1.2.1 Injection molding process: Inject plastic granules such as PP (polypropylene) and ABS (acrylonitrile-butadiene-styrene copolymer) into molds for seat supports, etc., using an injection molding machine. Injection molding parameters generally include:
Barrel temperature: 200-230℃ for PP, 210-240℃ for ABS, adjusted according to the molecular weight of the raw material.
Mold temperature: 50-80℃, used to improve plastic fluidity and reduce internal stress.
Injection pressure: 70-140 MPa, used to ensure that the melt fills the mold cavity.
1.2.2 Annealing treatment of injection molded parts, for example, baking at 60-80℃ for 2 hours to eliminate internal stress and prevent deformation.
1.2.3 Deburring of injection molded parts, for example, using a trimming machine to remove gates and flash.
2. Wheel Manufacturing
The wheels need to be adapted to different road conditions. The manufacturing process includes:
2.1 Wheel Hub Manufacturing: Made of aluminum alloy or plastic, formed by die casting or injection molding.
2.2 Tire Manufacturing: Using PU, rubber, or EVA, the tire body is produced by an extruder, and then vulcanized using a vulcanizing machine.
2.3 Assembly: The tires are mounted on the wheel hubs and connected by bearings to ensure smooth wheel rotation with a friction coefficient of ≤0.01.
3. Seat Manufacturing: Balancing Safety and Comfort
The seat needs to support the child’s spine and prevent slipping.