In the manufacturing boom, every inquiry is a stepping stone to opportunity. Today, we'll review our collaboration with a cutting-edge British DC induction cooker company on 304 stainless steel casings. From the initial inquiry to the final quote, every step embodies our factory's expertise and warm service.
- First Enquiry: An "Induction" Invitation from England
It was an ordinary morning when an inquiry from the UK popped up in our Foreign Trade Department's inbox. The sender was ZIQI, MENG, an intern at a leading British DC induction cooker company. In the email, she succinctly outlined her needs: a custom metal housing for their newly developed DC induction cooker series, specifically requesting 304 stainless steel, 1.2mm thick, and attached a preliminary design sketch.
Our sales team responded immediately, expressing their appreciation for her request and asking for further details: the specific dimensional tolerances for the housing, surface finish requirements (polished, brushed, or sandblasted), hole precision standards, any special mechanical or corrosion resistance testing requirements, and the expected order volume and lead time. ZIQI, MENG responded quickly, praising our quick response and providing all the technical specifications-this laid the foundation for a precise match.
- Deconstructing Customer Needs
(1) Material Analysis: 304 Stainless Steel
304 stainless steel has become the preferred material for kitchen appliance housings due to its excellent corrosion resistance, toughness and processing performance. For the customer's DC induction cooker application scenario, we focused on verifying two points:
Temperature resistance: DC induction cookers generate a certain amount of heat when working. 304 stainless steel has stable performance under working conditions below 200°C, fully meeting its heat dissipation and long-term use requirements; Processability: The shell in the customer's drawing has multiple openings, folded edges and welded structures (such as the dense installation holes and internal support structures in the figure). The ductility and weldability of 304 stainless steel can ensure the accuracy of these process links. At the same time, the thickness of 1.2mm achieves a balance between "strength-weight-cost" - it not only ensures the structural stability of the shell, but also does not increase unnecessary costs due to excessive thickness, and also meets the implicit requirement of kitchen appliance products for lightweight.
(2) Process analysis: "Precision control" from drawings to mass production
Hole opening and hole position accuracy: The number of mounting holes and heat dissipation holes on the shell is large and densely distributed. We use a combination of CNC punching machine + CNC machining center to ensure that the hole position tolerance is controlled within ±0.1mm, ensuring the precise assembly of the subsequent internal components of the induction cooker;
Folding and forming: The frame structure of the shell requires multiple folding and forming. Our CNC bending machine is equipped with high-precision molds, which can control the folding angle error within ±0.5° to ensure the squareness and sealing of the frame;
Welding and polishing: The internal support structure (such as the design similar to the heat sink in the figure) is welded by argon arc welding. After welding, it is finely polished to ensure that the weld is flat and burr-free, which not only ensures the structural strength but also avoids hidden dangers in subsequent assembly and use;
Surface treatment: Considering the high-end positioning of the British market for kitchen appliances, we recommend a brushed + passivated surface treatment solution - the brushed process gives the shell a delicate metal texture, and the passivation treatment further enhances the 304 Stainless steel has corrosion resistance and complies with EU RoHS environmental standards.
- Quote Generation
Our quote is divided into the following sections:
Raw Material Cost: This section clearly indicates the purchase price of 304 stainless steel sheet (based on current international steel futures prices + supplier bulk purchase discounts), and explains the rationale for selecting a 1.2mm thickness.
Processing Cost: This section breaks down the labor costs and equipment depreciation associated with each process, including CNC punching, bending, welding, CNC finishing, and surface treatment, to provide customers with a clear understanding of the cost logic associated with process complexity.
Mold and Jig Cost: The unique structure of this housing requires custom-made molds and jigs (such as bending dies and welding fixtures). We allocate these costs appropriately based on the estimated production volume, and we promise to transfer ownership of the molds to the customer upon order completion.
Quality Inspection and Testing Cost: This section includes incoming raw material composition testing (to ensure genuine 304 stainless steel), in-process quality inspection (for hole position, dimensions, and folding accuracy), salt spray testing of the finished product (to verify corrosion resistance), and assembly simulation testing. These costs are the ultimate guarantee of product quality.
After-Sales Service and Production Reserve: We promise to provide one year of free repairs for this enclosure (non-intentional damage) and reserve a certain percentage of production stock to meet customers' urgent replenishment needs.
Finally, we responded to ZIQI and MENG with a clear, professional, and warmly presented quotation. The email included not only a detailed quotation but also a "304 Stainless Steel Enclosure Process Description and Quality Assurance Manual," which showcased our production process and quality inspection standards with both illustrations and text.
