Dingxiang ForgingsThe precision of the factory forging blank or forging is higher. The application of technology and equipment can achieve less cutting or no cutting machining.

The metal material used for forging should have good plasticity, so that under the action of external force, it can produce plastic deformation without fracture. Among the commonly used metal materials, cast iron is a brittle material with poor plasticity and cannot be used for forging. Copper, aluminum and their alloys in steel and non-ferrous metals can be press-worked in a cold or hot state.

Not suitable for forming shape more complex forgings. Forging processing is formed in the solid state, compared with casting, the flow of metal is limited, generally need to take heating and other process measures to achieve. It is difficult to manufacture parts or blanks with complex shapes, especially with complex cavities.

Due to the above characteristics of forging, important parts subjected to impact or alternating stress(Such as transmission spindle, ring gear, connecting rod, rail wheel, etc.), should be used for forging rough processing, so forging processing is widely used in machinery manufacturing, mining, light industry, heavy industry and other industries.

Dingxiang Forging Factory wheel forgings forging molding mainly through heating, deformation and cooling processes, wheel forgings due to material composition and wheel forging size and showing a different state of organization, summed up mainly in the following two points.

1. Organization state of large wheel forgings

Such wheel forgings are generally formed by direct forging of steel ingots. Due to the large number of heating times during forging (6 fire or more), uneven deformation, large cross-section difference, high degree of material alloying, the outstanding characteristics of the structure of large wheel forgings are high residual hydrogen content and serious uneven structure (mixed crystal phenomenon), which is an important factor affecting the performance of large wheel forgings, so it is also a key problem to be solved in the heat treatment process design of large wheel forgings.

2. Organization state of small and medium wheel forgings

This kind of wheel forgings mainly use the rolling profile of the blank die forging forming, for the sub-co-analysis steel (medium carbon steel, medium carbon low alloy structural steel), after final forging air cooling to room temperature, generally get coarse block ferrite and layer flaky pearlite tissue;Generally, a coarse annealing state tissue can be obtained. In addition, due to the difference in the shape and cross-section of the wheel forging and the uncontrollable cooling, its organization is often uneven. At the same time, due to the effect of temperature stress (also known as thermal stress) and organizational stress, residual internal stress will occur in the wheel forging, so heat treatment must be used. Improve and eliminate the process.