The Hot Forging Process When a piece of metal is hot forged it must be heated significantly. The average temperatures necessary for hot forging are: Up to 1150 degrees Celsius for Steel 360 to 520 degrees Celsius for Al-Alloys 700 to 800 degrees Celsius for Cu-Alloys During hot forging, the temperature reaches above the recrystallization point of the metal. This kind of extreme heat is necessary in avoiding strain hardening of the metal during deformation. In order to prevent the oxidation of certain metals, like super alloys, a type of hot forging called isothermal forging is a good choice. In isothermal forging, the metal deformation occurs within a highly controlled atmosphere, similar to that of a vacuum. Hot Forging Considerations Traditionally, manufacturers choose hot forging for the fabrication of parts that have a greater influence in the technical arena. Hot forging is also recommended for the deformation of metal that features a high formability ratio. Other considerations for hot forging include: 1. Production of discrete parts 2. Low to medium accuracy 3. Scale Formation 4. Low stresses or low work hardening 5. Homorgenized grain structure 6. Increased ductility 7. Eliminiation of chemical incongruities Possible disadvantages of hot forging include: Less precise tolerances Possible warping of the material during the cooling process Varying metal grain structure Possible reactions between the surrounding atmosphere and the metal The Article from Thomasnet.com
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Hot Forging Vs. Cold Forging
Hot Forging VS cold forging Forging is the process of deforming metal into a desired shape using certain tools or equipment in 3 types, hot forging, cold forging, warm forging. Hot forging and cold forging are two different metal forming processes that deliver similar results. Guokun Machinery, with 10 years forging experience, can choose the right type of forging as per your drawing or application. Let’s offer some details of hot forging and cold forging. The hot forging process When a piece of metal is hot forged it must be heated significantly. The average temperatures necessary for hot forging are: Up to 1150 degrees Celsius for Steel 360 to 520 degrees Celsius for Al-Alloys 700 to 800 degrees Celsius for Cu-Alloys Please note that we only can supply you the steel forging parts. Advantages of hot forgings: Production of discrete parts; Low to medium accuracy; Scale Formation; Low stresses or low work hardening; Homorgenized grain structure; Increased ductility; Eliminiation of chemical incongruities Disadvantages of hot forgings: Less precise tolerances; Possible warping of the material during the cooling process; Varying metal grain structure; Possible reactions between the surrounding atmosphere and the metal Cold Forging Cold forging deforms metal while it is below its recrystallization point. Cold forging is generally preferred when the metal is already a soft metal, like aluminum. This process is usually less expensive than hot forging and the end product requires little, if any, finishing work. Sometimes, when aluminum is cold forged into a desired shape, it is heat treated to strengthen the piece. This is called “tempering.” Advantages of cold forgings: Easier to impart directional properties; Improved interchangeability; Improved reproducibility; Increased dimensional control; Handles high stress and high die loads; Produces net shape or near-net shape parts Disadvantages of cold forgings: Easier to impart directional properties; Improved interchangeability; Improved reproducibility; Increased dimensional control; Handles high stress and high die loads; Produces net shape or near-net shape parts; The metal surfaces must be clean and free of scale before forging occurs; The metal is less ductile; Residual stress may occur; Heavier and more powerful equipment is needed; Stronger tooling is required
Gray Iron Casting
Gray Iron Casting Gray iron is a very versatile foundry metal that is suitable for producing a variety of castings for pump, valve, compressor, motor, rail, mining and automotive Gray iron, or grey cast iron, is a type of cast iron that has a graphitic microstructure. It is named after the gray color of the fracture it forms, which is due to the presence of graphite. It is the most common cast iron and the most widely used cast material based on weight. Gray Iron Advantages: Resistance to cracking High temperature properties Inexpensive to produce and to finish Produces repeatable metal products Offers castings with significant cast-in features and details The main gray iron for casting are ASTM A48, ASTM A126, ASTM A247, ASTM A278, ASTM A319, etc If need the ductile iron castings, gray iron casting, ductile iron sand casting, ductile iron shell mold casting,gray iron sand casting, gray iron shell mold casting, gray iron foundry, ductile iron foundry, cast iron casting, please send the drawings to gina@guokuncasting.com or gina.guokun@gmail.com Investment casting, precision casting, lost wax casting, water glass casting sand casting, shell mold casting, resin sand casting Aluminum die casting, sand casting, http://www.guokuncasting.com/product/aluminum-alloy-die-casting/die casting manufacturer steel investment casting, steel precision casting, carbon steel lost wax casting, alloy steel investment precision casting, stainless steel silica sol casting Forging parts, hot forging parts, heavy forging
Shrinkage Allowance for casting metals
All the matels shrink when cooling except perhaps bismuth. This is, because of the inter-atomic vibrations which are amplified by an increase in temperature. However, there is a distinction to be made between liquid shrinkage and solid shrinkage. Liquid Shrinkage refers to the reduction in volume when the matel changes from liquid to solid state at the solidus temperature. Solid shrinkage is the reduction in volume caused, when metal loses temperature in solid state. The shrinkage allowance is provided to take care of this reduction. The Shrinkage allowance of casting metals are as follows: Grey cast iron: 0.7-1.05%, Mallable Iron: 1.5%, Steel: 2.0%, Aluminum alloys: 1.3-1.6%, Brass: 1.4%, Bronze 1.05-2.1% When cooling solidification, the casting with perfect packaged will be smaller shrinkage allowance. The thin-walled casting’s shrinkage allowance is smaller than the thick-walled casting’s. The percentage of large casting’s shrinkage is smaller than the small castings. The shrinkage allowance of complex-shape casting is smaller than the simple one. Even on the same casting parts, the shrinkage allowance is different on different sizes. Baoding Guokun Machinery or Baoding Guokun Casting, manufacture and produce the steel casting, carbon steel casting, alloy steel casting, stainless steel casting, investment casting, sand casting, resin sand casting, shell mold casting, grey iron casting, ductile iron casting, pipe fitting, bronze casting, brass casting, aluminum die casting, agricuture casting parts, auto parts, hot forging, heavy forging, etc, please send the drawings to gina@guokuncasting.com or gina.guokun@gmail.com
Carburizing on low carbon steel parts
Carburizing on low carbon steel parts Carburizing or Carburization is a heat treatment process in which iron casting, steel casting, steel forging, especially low carbon steel casting, low carbon steel forging parts. Carburization can be used to increase the surface hardness of low carbon steel. Carburizing process is a heat treating process in which iron or steel absorbs carbon while the metal is heated in the pressure of a carbon-bearing material, such as carbon monoxide. Depending on the time and temperature, the depth will be different. Longer carburizing times and higher temperatures typically increase the depth of carbon diffusion. If need low carbon steel investment casting parts, low carbon steel sand casting components, low carbon steel hot forging parts, stainless steel silica sol casting, stainless steel precision casting, alloy steel investment casting, carbon steel investment casting, carbon steel sand casting, aluminum die casting, pump parts, pipe fittings, auto parts, agricultural casting parts, manhole covers, etc, please contact Guokun Machinery, Guokun casting, gina@guokuncasting.com or gina.guokun@gmail.com
Contact Us
Name: Gina
Tel: 86-312-5951319
Fax: 86-312-595-1296
Phone: 86-181 3278 9710
E-mail: gina@guokuncasting.com or gina.guokun@gmail.com
Add: 777# Chaoyang South Street, Baoding City, Hebei, 071000, China
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