The edge finishing process of a stainless steel three-tier dining car directly affects its durability, safety, and aesthetics, requiring comprehensive consideration from multiple dimensions such as material properties, processing precision, functional requirements, and usage scenarios. Its core processes include grinding and polishing, chamfering, scratch-resistant design, optimized welding processes, and reinforced edge protection; these aspects collectively determine the overall quality of the dining car.
Edge grinding and polishing is a fundamental process, removing burrs and sharp edges generated during cutting using mechanical or manual methods to prevent scratches to operators or damage to items during use. Grinding should be done in stages, first using coarse sandpaper to remove obvious burrs, then gradually switching to fine sandpaper until the edges are smooth. Polishing uses a cloth wheel or wool wheel with polishing compound to achieve a mirror-like finish, not only improving aesthetics but also reducing stain adhesion. For a three-tier dining car, the consistency of polishing between the upper and lower edges is particularly important; otherwise, differences in reflection will affect the overall texture.
Chamfering is a crucial step in improving edge safety. Traditional right-angled edges are prone to stress concentration upon impact, leading to deformation or cracking. Cutting edges into 45-degree bevels or rounded corners through machining effectively disperses stress and enhances edge strength. Rounded corners are particularly suitable for scenarios where dining carts move frequently, reducing the risk of scratches against walls and other equipment. Simultaneously, chamfering improves cleaning convenience, preventing dirt accumulation on sharp edges.
Scratch-resistant designs must consider material characteristics and usage scenarios. Although stainless steel panels have high hardness, their edges can still be scratched by impacts during long-term handling. A common process is to wrap PVC or silicone corner protectors around the edges, securing them with adhesive or clips, protecting the edges and adding anti-slip functionality. Another method is to use a one-piece bending process, folding the panel edge downwards to form a U-shaped groove, concealing the original cut surface and increasing impact resistance by adding thickness. This design is especially important in three-tier dining cars, preventing items from slipping and directly impacting the edges.
Optimization of the welding process directly affects the stability of the edge structure. The shelves and frame of a three-tier dining car are typically fixed by welding. Improper weld treatment can easily lead to incomplete welds, porosity, or cracks at the edges. Using argon arc welding can reduce oxidation. After welding, the weld seams need to be ground and acid-etched to remove the black oxide layer and form a dense passivation film, improving corrosion resistance. For the connections of moving parts in the dining car, such as hinge mounting points, full welding rather than spot welding should be used to ensure that the edges do not crack under stress.
Edge protection reinforcement must balance functionality and cost. In medical or food processing scenarios, the edges of the dining car must meet hygiene standards, avoiding the use of coatings or corner protectors that may peel off. In this case, a laser-cut one-piece molding process can be used to reduce welding points and minimize cleaning dead zones. For dining cars used outdoors, the edges need to be sandblasted to create a uniform matte surface, which can hide minor scratches and improve anti-slip performance by increasing surface roughness.
The structural characteristics of a three-tier dining car place higher demands on edge treatment. The spacing between shelves must consider edge load-bearing capacity. If the spacing is too large, the shelf edges are prone to deformation due to concentrated item placement. Adding reinforcing ribs to the shelf edges or using a double-layer stainless steel composite structure can significantly improve edge bending resistance. Furthermore, vibrations during cart movement can cause friction between the shelf edges and the frame; therefore, wear-resistant rubber strips should be applied to the contact surfaces to protect the edges and reduce noise.
From a detailed craftsmanship perspective, edge treatment also needs to consider ergonomic design. For example, wrapping the edges of the cart's handles with soft material improves grip comfort; and using smooth, rounded edges in areas easily accessible to children prevents accidental injuries. While these details do not directly affect structural strength, they significantly enhance the user experience and demonstrate the professionalism of the product design.
