Raw Material Inspection:
When an iron chain manufacturer purchases a batch of raw materials, workers need to cut 10cm pieces for hardness and spectral analysis to check if the chemical elements meet standards. Then, workers visually inspect the quality of the raw materials; only those that pass inspection begin production.
Welding Production Line:
Production is based on customer requirements. Chain weaving and welding machines are used to weave the chains, followed by welding with a flame welding machine to ensure a smooth surface. A breaking test is conducted at this stage to measure the chain's tensile strength and rated load.
First-stage alignment Preliminary Steps:
Blackened chains require a first calibration. This step confirms that the chain links meet standards. The purpose of calibration is to affix a steel stamp for marking, according to customer requirements. This stamp must be clearly visible.
Heat Treatment Process:
Galvanized chains require heat treatment, commonly known as quenching. This is performed under dual-frequency conversion and constant temperature control. Heat treatment improves the chain's hardness and toughness. A section of the chain is then cut for surface hardness, breaking strength, and elongation tests to ensure compliance with standards.
Second Calibration Process:
Round link chains require... Secondary calibration is required, involving cutting 5 or 7 links for calibration. The tensile strength must be greater than 2.5 times the rated load, and the chain dimensions must meet the customer's requirements.
Bow Pull Test:
Each 6-meter manganese steel chain is pulled with a bow pull test at 2.5 times the rated load. This is to verify the consistency of the 6-meter chain and to check the effectiveness of the heat treatment.
Cutting:
The chain is cut to specific dimensions according to customer requirements, such as 6 meters, 10 meters, or 20 meters. A chain breakage test is also required at this stage.
Surface Treatment:
High-temperature resistant chain cutting. Afterwards, surface treatment processes are required according to customer requirements. These include polishing, blackening, galvanizing, electrophoresis, and Dacromet coating, among others. The purpose of these surface treatments is rust prevention, and customers need to choose the appropriate process based on their intended use environment.
Finished Product Inspection:
After the chain is manufactured, the quality control department conducts inspections. This involves testing the chain's hardness, tensile strength, breaking strength, and elongation to ensure it meets standards.
Packaging and Warehousing:
After passing inspection, the chain needs to be packaged and stored. Suitable packaging methods include ton bags, wooden crates, iron drums, and plastic drums.