I. Material Procurement

Senfa will strictly verify sub suppliers and assess their quality assurance capabilities,Suppliers are required to provide quality certificates and physical-chemical test reports for raw materials. For purchased raw materials, the Quality Inspection Department is notified to conduct inspections in accordance with standards to eliminate the presence of substandard materials.

II. Production Process

1. Senfa has complete production equipment,Every cycle, all equipment, operators, and key processes (such as pipe rolling, welding, hot-dip galvanizing, and plastic spraying) undergo verification and authentication once.

2.In accordance with the requirements of the Work Environment Management Regulations, the workshop brightness is maintained, and items are stacked in an orderly manner to prevent collision and damage.

3.The Production Technology Department is responsible for controlling the production process. It carefully studies contracts, and strictly adheres to production task orders, product processing drawings, technical processes, and work instructions to ensure production meets quality, quantity, and schedule requirements.

A. Lamp Pole Production

a. Material Cutting: Numerical control (NC) automatic plasma cutting is adopted, ensuring precise cuts with a kerf width of no more than 1mm.

b. Forming: A 15-meter-long NC bending machine is used for one-time die forming, achieving high precision, low out-of-roundness, smooth surface, and an attractive shape.

c. Welding: NC automatic closing machines are used for welding, enabling one-time weld formation with a uniform surface and a non-straightness error of less than 2‰.

d. Shaping: Shaping is carried out in two stages:

1.Shaping after welding: To ensure the correctness of assembly welding and the consistency of the appearance of the entire batch of lamp poles.

2.Shaping after hot-dip galvanizing and before plastic spraying: To eliminate lamp pole bending caused by thermal stress from hot-dip galvanizing.

e. Bending: The bending value is determined by considering the springback factor of the steel pole. An automatic pipe bender is used to ensure consistent forming.

f. Galvanizing: The national standard GB/T13912-92 is strictly implemented. The adhesion of the galvanized layer meets the requirements of GB2694, with a thickness of more than 85μm. The zinc layer is smooth, free from zinc buildup, pitting, and missing plating, ensuring the lamp pole remains corrosion-free for 20 years.

g. Polishing: Comprehensive polishing is performed to remove burrs, and defective parts are repaired.

h. Plastic Spraying: Sanding is first conducted to enhance adhesion. During the plastic spraying process, curing time and temperature are strictly controlled to ensure the plastic layer is uniform, smooth, and free from air bubbles.

i. Electrical Door Cutting and Flange Welding: An NC plasma cutting machine is used to cut the electrical door, ensuring high precision and a narrow kerf.

B. Luminaire Production

a. Melting: A crucible melting resistance furnace is used for aluminum alloy melting. To optimize the quality of the aluminum liquid, melting follows operational principles, such as ensuring accurate charge composition and thorough cleaning (melting tools and crucibles are carefully cleaned, and direct contact between iron and aluminum liquid is prohibited). The charging sequence for melting is: aluminum ingots, Al-Si master alloy, and return scrap.

b. Die Casting: The company is equipped with a 1250T large-scale cold horizontal die-casting machine. Process parameters are set through the development of process cards to ensure product quality. Key process parameters include: mold preheating temperature, die-casting temperature, injection force, injection speed, and pressure-holding time.

c. Luminaire Body Assembly: Parts of the luminaire body are scribed, drilled, and tapped in accordance with drawing requirements. Aluminum castings are filed smooth. Parts requiring turning, planning, or milling are processed by the metalworking workshop, where the company has a complete set of turning, grinding, planning, and milling equipment.

d. Spray coating: After polishing and grinding, electrostatic powder coating is applied. Senfa has a fully automatic spray coating production line. The plastic powder adopts pure polyester thermosetting powder coating suitable for outdoor use, with a smooth surface, no bubbles, and various properties that meet national standards.

4.Authorized quality inspectors conduct in-process inspections during product processing, record findings carefully, assist operators in effectively controlling production, and ensure products can only be transferred to the next process or delivered after passing inspection.