The process way to improve the plasticity of forgings and reduce deformation resistance In order to facilitate the flow forming of metal blanks, reasonable measures can be taken to reduce deformation resistance and save equipment energy during forging, the following methods are generally used to achieve.
Grasp the material properties of forgings and select reasonable deformation temperature, deformation speed and deformation degree.
Promote the homogenization of chemical composition and structure state of materials. For example, homogenize large high alloy steel ingots at high temperature to improve the plasticity of materials.
Select and determine the most favorable deformation process. For example, when forging high alloy steel forgings that are difficult to deform and have low plasticity, in order to keep the material surface under pressure during upsetting and prevent cracks caused by tangential tension, the jacketed upsetting process can be used for forging.
Using different tools can improve the non-uniformity of deformation. For example, V-shaped anvil or round anvil can be used to elongate shaft forgings to increase the surface pressure of forgings, so as to improve the plasticity and prevent cracks on the surface and center of forgings.
The operation method was improved to reduce the influence of friction and temperature drop during forging, and to avoid upsetting. For example, for the thin cake forgings of low plasticity materials, the process method of stacking two pieces for upsetting once, then turning each piece 180 ° for the second upsetting can be used to solve the problem.
Better lubrication measures can improve the surface condition of forgings and dies, reduce the influence of friction, obtain uniform deformation, and reduce deformation resistance.