The analysis of the warm extrusion forming process shows the automotive differential planetary gear forgings, and the material is 20CrMnTi cold drawn round steel. The planetary gear warm extrusion process is: blanking (a) → annealing → phosphating - saponification → pre-twisting (see b) → relubrication treatment → heating → occlusion extrusion (see 2c) → surface cleaning → cold Finishing.
The specific operations of blank lubrication, heating and mold lubrication are as follows: planetary gear forgings (a) (b) (c) extrusion forming process a - blank b - pre-form forming c - occlusion extrusion (1) The billet is lubricated. The billet is heated to 150 to 200 ° C, placed in a water-soluble graphite liquid, and immediately taken out and quickly dried. This allows the billet to prevent oxidation when heated prior to warm extrusion and at the same time lubricates during warm extrusion.
The mold has the following characteristics: the mold adopts a floating concave mold structure, and has the advantages of small deformation resistance and good filling property compared with the fixed concave mold structure adopted by the conventional closed type flashless die forging. Before the start of the extrusion, the concave mold cavity 4 is at the upper limit position, forming a concave cavity with the ejector rod 14 to facilitate the placement and positioning of the blank.
The mold ensures that the whole process of the toothed precision forging of the gear is carried out in the closed cavity, the forging has no flash, and the forging has good filling performance. The tooth mold 3 is located in the upper mold, and immediately follows the slider after extrusion, the contact time with the forging is short, the mold temperature rise is small, and the mold life is high.
Pallet 11 closed type temperature extrusion die hydraulic system 1. Hydraulic cylinder 2. Fuel tank 3. Regulator valve 4. Compressed air 5. Relief valve 4 Before the mold is closed, the cylinder is filled with a certain pressure of oil before the mold is closed. , the floating piston 12 is in the upper limit position, under the support of the pressure receiving rod 7, the lower concave mold 15 and the concave mold cavity 4 are also in the upper limit position, together with the lower punch 16 and the ejector rod 14 form a concave cavity; The heated pre-form blank is placed in the cavity, and as the press slider descends, the tooth mold 3 first contacts the concave mold cavity 4 and the lower die 15 to form a closed cavity; the upper die follows the slider Continue to descend, so that the upper and lower punches simultaneously press the blank forming; during the downward movement of the lower die 15, the floating piston 12 is pushed by the pressure receiving rod 7 to squeeze the oil out of the cylinder; at this time, due to the overflow valve The function is to maintain a stable high oil pressure in the cylinder, to ensure that the upper and lower concave molds are always tightly closed, thereby ensuring that the forgings do not have flash edges, and at the same time improving the filling of the cavity angles; after the extrusion is completed, the press is slippery The block is up, relying on the pressure of the gas capping oil, so that the lower die 15 is reset upwards, and at the same time, the punch is removed from Take out in the forging; take out the forging to complete a cycle.
Ending the production of gears by the occlusion temperature extrusion process can reduce raw material and energy consumption, reduce production costs, and improve the mechanical properties of the gears. The production practice proves that the above-mentioned planetary gear occlusion temperature extrusion process and the mold are advanced and practical, the mold life is high, the production needs are met, and the economic effect is remarkable.
Quantification Packing Machine
Flour Weighing Packing Machinery,Quantification Packing Machine,Maize Flour Quantification Packing Machine,Wheat Flour Quantification Packing Machine
HEBEI PINGLE FLOUR MACHINERY GROUP CO., LTD , https://www.plrollermill.com