Rotary forging-Automatic Forging roller machine

Roll forging is a type of rotary forging. It is a new forging process that has been developed by introducing longitudinal rolling into the forging industry in recent decades and belongs to the category of rotary compression forming.

• Features

It has higher technical and economic advantages than die forging, and its characteristics are smaller working load, high production efficiency, less material consumption, superior quality and good working conditions.

• principle

The deformation principle of roll forging is shown in the figure. Roll forging deformation is a complex three-dimensional deformation. Most of the deformed material flows along the length direction to increase the length of the blank, and a small part of the material flows horizontally to increase the width of the blank. The root cross-sectional area of the blank is continuously reduced during the roll forging process. Roll forging is suitable for deformation processes such as drawing shaft parts, rolling slabs and distributing materials along the length direction.

Application:

Roll forging can be used to produce connecting rods,Rigging， twist drills, wrenches, spikes, hoes, picks and turbine blades. The roll forging process uses the principle of rolling forming to gradually deform the blank. Compared with ordinary die forging, it has the advantages of simpler equipment structure, stable production, low vibration and noise, easy automation and high production efficiency.

The essence of roll forging deformation is the rolling extension of the billet. The cross section of the billet becomes smaller and the amplitude of the surface increases. When the cross-sectional deformation is large, it needs to be completed by multiple rolls. The process design is mainly to reasonably determine the amount of reduction, widening and extension deformation of each step of roll forging. They depend on the size of the roll diameter, the shape and size of the hole, the temperature of the billet, the cooling and lubrication of the deformation conditions

During the forward slip roll forging process, the volume of material flowing into and out of the deformation zone is equal at each moment, while the height of the deformation zone is changing. Therefore, the material movement speed along the roll forging direction is also changing. At the exit of the deformation zone, the material movement speed is greater than the linear speed of the forging roll. This phenomenon is called forward slip. Since the length of the roll forging is determined by the movement speed at the exit, it is of great significance to calculate the forward slip. The Fink formula for calculating the forward slip is S=(R/h-1/2)r2r=(α/2)×(1-α/2β)

where S is the forward slip value;

R is the radius of the roll forging die;

α is the bite angle; β is the friction angle;

h is the height at the exit of the deformation zone.

The Fink formula is derived under the condition of ignoring the width of the people and is an approximate formula for calculating simple deformation. For the longitudinal variable section roll forging constrained by the groove, the forward slip value is smaller than that of the simple roll forging.

By following these steps, you can efficiently replace the die on your wedge cross rolling machine, ensuring it operates smoothly and maintains high production quality. If you're using equipment from Zibo Hongjie Forging Industry Equipment Co., Ltd, feel free to contact us for further assistance. Call us at 8613678642889, email [email protected], or visit www.hjforging.com for support.