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The post-heat treatment of forging work rolls of tandem cold rolling mills in forging plants is the surface quenching treatment of the roll body. In order to ensure its excellent performance, it is necessary to control the structure, hardness gradient and residual stress distribution of the hardened layer during the final heat treatment. In order to achieve the desired effect, it is necessary to strengthen research in metallurgy and technology. Forgings have high heat treatment quality requirements and excellent microstructure. The structure of the quenched layer is martensite + a small amount of remaining austenite + granular carbides. The desired group structure is cryptocrystalline martensite or fine needles. The absence of large acicular martensite increases the brittleness of the hardened layer. The surface must be solid. High strength is the guarantee of wear, but it should not be too high. The hardness level should be reasonably selected according to the operating conditions of the mill.
The hardness distribution of the forgings of the forging manufacturer is relatively reasonable. In order to ensure the requirement of effective hardening depth, the forge manufacturer has extended the service life of the roller. The selection of deep hardened layer rolls can reduce the heavy quenching consumption of unstable cold tandem mills. Below the hardened layer there should be a smooth transition layer to support the hardened layer. The rationale for the stress distribution remains. After surface hardening and low temperature tempering, it is necessary for the roll to have a large residual stress. The cold rolling work roll has a great influence on the contact fatigue life. During the rolling process, there must be residual tensile stress in the center of the roll. During forging, the peak tensile stress should not be too large. In order to achieve the above process policies, Dongguan forgings can be divided into overall rapid heating and induction heating according to different heating methods. Now, with induction heating as the main method, there are various process models, each of which is a complete set of equipment and technical systems.
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1. Improve the internal structure of the metal and improve the mechanical function of the metal;
2. High labor productivity;
3, the use of a wide range. The quality of forgings is as small as less than 1kg and as large as hundreds of tons; it can be produced in single pieces, small batches, or in large batches;
4. The use of precision die forging can make the size and shape of the forgings close to the finished parts, so it can greatly save metal materials and reduce cutting and processing time;
5. Forgings with messy shapes cannot be cast.
LD2 aluminum plate is an aluminum-silicon alloy plate, also known as 6402, with medium strength, high annealing and hot plasticity, good plasticity after quenching and natural aging, and the corrosion resistance in this state is comparable to 5A02.34A21. Alloys in the artificially aged state have a tendency to intergranular corrosion, which can be tolerated after cutting and quenching, but not after annealing. The alloy is capable of spot welding, atomic hydrogen welding and gas welding.
Heat treatment standard:
1. Homogeneous annealing: heating at 525~540°C; holding time 12~14h; furnace cooling;
2. Rapid annealing: heating at 350~370℃; heat preservation for 30~120min according to the useful thickness of the material; air cooling;
3. Quenching and aging: 510~530C quenching, water cooling; artificial aging 150~165℃, 6~15h, air cooling; room temperature natural aging 96h.
In addition to the necessary mechanical function and corrosion resistance function, the cast aluminum alloy in the forging plant should also have excellent casting function. Among the cast aluminum alloys, the best combination of casting function and mechanical function is aluminum silicon alloy, also known as silicon aluminum alloy cast aluminum alloy, which has excellent casting function, low density, excellent corrosion resistance, and heat gain and toughness. ; Used to make castings with complex shapes but low strength requirements, such as aircraft, instrument casings, etc.; medium and low-grade solid castings with complex shapes, such as motor casings, cylinders, fan blades and engine pistons.