Forging forging diagram planning on the hydraulic press die forging according to the scale and requirements of the part diagram, consider the process characteristics of the hydraulic press die forging, as far as possible to reduce the auxiliary work step.
Features diesel connecting rod, engineering machinery forgings, connecting rod forgings, claw pole forgings, automotive chassis forgings
The forging drawing planning of die forging on the hydraulic press should consider the process characteristics of die forging on the hydraulic press according to the scale and requirements of the part drawing, and reduce the auxiliary working steps as far as possible.
1. Die forging on hydraulic press, allowance and tolerance of height direction should be larger. Because of the hydraulic press on the die forging, metal activity inertia is very small or simply zero, the deep groove is not easy to fill.
2. Fillet radius Hydraulic press on the die forging metal activity is simply no inertia, so the fillet radius should be larger, conducive to metal activity, fill the deep groove.
3. Die forging slope because the hydraulic press is provided with a ejector, the die forging slope can be reduced, generally 3°? 7 °; Some even can not set the slope.
Two, the billet process planning
The filling performance of the forging metal in the upper die forging of the hydraulic press is poor, so preforming should be carried out generally. However, the moving beam of the hydraulic press is slow, so it is not suitable for making the blank. Together, in order to avoid large hydraulic press to bear eccentric load, generally choose single groove die forging. For the shape of disorderly forgings and fine forgings to use multiple sets of molds, in order to make the metal activity gentle, uniform deformation, continuous fiber, and ensure that the deep concave groove is full of. For shaft forgings and disorderly forgings, free forging can be used, or special billet die making, or joint use, the detailed selection is as follows.
1. Selection of shaft forging blanks
Forgings with uniform cross sections can be formed by direct final forging of bars. For flat long forgings with uneven cross section and large change, the following forging scheme is selected:
Free forging - final forging;
Special billet die making -- final forging;
Pre-forging final forging;
Free forging - pre - forging - final forging.
2. Random forging blanks selection free forging blanks - final forging;
Free forging billet - special billet die - final forging;
Free forging - preforging - final forging;
Free forging billet - special billet die - pre-forging - final forging.
Die forging blank
3. Forging die planning features
Hydraulic press on the die forging die for combination. Hydraulic press die forging also separate die forging and closed die forging two. The planning process of the open die forging die is similar to that of the hammer forging die. The planning of closed die forging die is similar to that of screw press. The biggest characteristic of forging die for hydraulic press is that it can be planned into closed combination die, so as to forge the disorderly shape forgings with inner cavity and fine forgings without die forging slope.
Hydraulic press on the forging die, the forging die slope of the upper die should be larger than the lower die, in order to prevent the forging stuck in the upper model groove can not come out. Because the hydraulic press is static load, the pressure is adjustable, and the overflow valve is maintained when it is overloaded, the impact surface of the mold is not as strict as the die forging on the hammer, and only the strength of the module is enough.