Ring forgings are a product of the forging industry and a type of forging. They are ring-shaped objects that are formed by applying external force to metal billets (excluding plates) and forming them into suitable compression forces through plastic deformation. This force is typically achieved by using a hammer or pressure. The forging process builds a refined grain structure and improves the physical properties of the metal. Ring forgings can be seen everywhere in daily life and are an industrial product.
Production process
1. Sliding wire blanking: Cut the steel ingot into reasonable size and weight according to product requirements.
2.Heating (including tempering): The heating equipment mainly includes single-chamber furnace, push rod furnace and table annealing furnace. All heating furnaces use natural gas as fuel.
The heating temperature of the steel ingot is generally 1150℃～1240℃. The heating time of cold steel ingot is about 1 to 5 hours, and the heating time of hot steel ingot is half of the heating time of cold steel ingot. The heated steel ingot enters the forging process.
3. Forging: The steel ingot heated to about 1150～1240℃ is taken out of the heating furnace, and then put into the air hammer or electro-hydraulic hammer by the operator. According to the size of the steel ingot and the forging ratio requirements, the corresponding roughening, drawing and other processes are carried out, the size of the forging is monitored in real time, and the forging temperature is controlled by an infrared thermometer.
4. Inspection: Preliminary inspection of the forging blank is carried out, mainly the appearance and size inspection. In terms of appearance, the main inspection is whether there are defects such as cracks. In terms of size, the blank margin must be guaranteed to be within the requirements of the drawing, and records must be kept.
5. Heat treatment: Heat the forging to a predetermined temperature, keep it warm for a certain period of time, and then cool it at a predetermined speed to improve the internal structure and performance of the forging. The purpose is to eliminate internal stress, prevent deformation during machining, and adjust the hardness to make the forging easier to cut. After heat treatment, the steel ingot is air-cooled or water-cooled and quenched according to the material requirements.
6. Rough processing: After the forging is basically formed, it is processed into forgings of various specifications according to product requirements.
7. Ultrasonic flaw detection: After the forging is cooled, the temperature drops to about 20℃ for ultrasonic flaw detection to meet national standards Ⅰ, Ⅱ, Ⅲ and other standards and surface defect inspection.
8. Mechanical property test: In order to meet customer needs, the mechanical properties of the forgings must be tested, mainly yield, tensile, impact and other tests. The company’s main testing equipment includes 1 universal mechanical properties tester, 1 impact tester, 1 continuous steel bar dotting machine, 1 ultrasonic flaw detector, 1 magnetic particle flaw detector, 2 thermometers, 1 electric double-blade broaching machine, 1 impact cryostat, 1 metallographic microscope, 1 metallographic pre-grinder, 1 metallographic cutting machine, 2 Brinell hardness testers, etc., which can basically meet the needs of routine testing of various forgings.
9. Final inspection: The finished forgings are finally inspected to ensure that the appearance of the forgings is smooth and free of defects such as cracks, and the dimensions are within the requirements of the drawings and are recorded.
10. Warehousing: After quality inspection, the finished forgings are simply packaged and put into the finished product warehouse for shipment.
The application fields of ring forgings are: Diesel ring forgings: a type of diesel engine forgings. Diesel engines are a type of power machinery, and they are often used as engines. Taking large diesel engines as an example, the forgings used include cylinder heads, main journals, crankshaft end flange output end shafts, connecting rods, piston rods, piston heads, crosshead pins, crankshaft transmission gears, gear rings, intermediate gears, and oil pump bodies, etc.
Ring forgings have a history of thousands of years in my country. Machine forging is carried out using forging tools on various forging equipment. Machine forging can be divided into four categories according to the equipment and tools used: free forging, model forging, die forging and special forging.
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Post time: Aug-06-2024
