Electric Bus Model Manufacturer
Case Study: Production Process of a Pure Electric Bus Scale Model
1. Material Selection and Structural Design
1.1 Selection of Main Materials
The body of the bus model is primarily constructed using ABS engineering plastic sheets, which offer a balance of rigidity and flexibility, making them ideal for shaping the square outlines and rounded corners typical of buses. The windows are crafted from 0.8mm thick transparent acrylic sheets, with the frame edges produced through laser cutting to ensure precise straight lines. The roof housing for the battery pack module is meticulously carved from high-density foam, covered with ABS sheets to simulate the appearance of cooling grids.
1.2 Detail Component Craftsmanship
- Wheel System: The wheel hubs are manufactured using resin flipping technology, with tires crafted from soft silicone material and molded into tread patterns through hot pressing. The axles are fashioned from brass rods to ensure smooth rotation.
- Door Structure: Front and rear doors feature a “nesting” design, combining an ABS frame with a 0.2mm thin copper sheet on the outer layer to mimic metallic textures. Door handles are bent from 0.3mm copper wire.
- Rearview Mirror: Made by cutting and polishing an acrylic rod, applying metallic silver spray, and securing it with micro screws.
2. Production Process
2.1 Vehicle Body Forming Process
A 1:24 scale wooden mold is first created, and ABS boards are heated and vacuum-formed to shape the body. The roof air conditioning unit is fabricated using a “splicing and carving” process, where the basic shape is cut from ABS sheets, followed by detailed carving of heat dissipation holes and ventilation grilles. Seams are filled and polished using progressively finer sandpaper (400 mesh, 80 (mesh, 1200 mesh) to achieve a smooth and flawless finish.
2.2 Painting Process
- Primer Treatment: A gray epoxy primer is applied to the entire model and baked for 2 hours, followed by light polishing with 2000 grit sandpaper.
- Main Color Coating: The “color separation cover” technique is employed, where masking tape precisely covers designated areas. White topcoat is sprayed twice (with a 30-minute interval), followed by three thin coats of fluorescent green paint to ensure uniform color coverage.
- Identification Production: The phrase “100% ELECTRIC BUS” is printed using water transfer technology and protected with clear coat. The company logo is applied via UV printing on thin film and affixed to the side of the model.
2.3 Interior Restoration
Seats are cut from ABS sheets and covered with brown simulated leather. Armrests are formed by bending 0.5mm stainless steel wire, while the roof light box incorporates a light guide plate with embedded micro LED strips to simulate illumination. The cockpit dashboard is assembled using stickers and adhesive techniques to create a three-dimensional display effect.
3. Post-Processing
3.1 Aging Effect Treatment
- Car Body Aging: Black enamel paint is delicately brushed into door gaps and wheel arches to simulate dust accumulation, while a sponge dipped in light gray paint is lightly tapped onto the roof edges to create a natural fading effect.
- Tire Wear: Silver paint is dry-brushed onto the tire sides to highlight wear marks, with black oil paint filling tread gaps for enhanced three-dimensional effect.
3.2 Scene Adaptation
A realistic bus stop environment is constructed using gray PVC flooring with tile stickers, an acrylic bus shelter topped with a miniature solar panel, and hand-painted zebra crossings on the ground to create an authentic street atmosphere.
4. Key Points of Restoration Control
- Color Accuracy: Color card comparisons ensure the green areas match the prototype within a visually imperceptible range, while the white roof is treated with matte paint to minimize reflective effects.
- Proportional Accuracy: Strictly adhering to a 1:24 scale, body dimensions are controlled to ±0.3mm, with wheelbase measurements matching the prototype exactly.
- Detail Enhancement: The roof charging interface is fabricated from metal etched sheets, while wipers are made from memory metal materials for adjustable angles. Side ventilation openings are drilled using a 0.1mm drill bit for uniform hole spacing.
Through this meticulous process, the model achieves over 90% fidelity to the prototype in terms of shape, color, and detail. Whether displayed statically or dynamically integrated into a scene, it effectively showcases the modern aesthetics and technological features of pure electric buses.
