Deep hole extrusion die

Abstract

The invention discloses a deep hole extrusion die. The deep hole extrusion die comprises an upper die assembly, an upper extrusion punch, a floating female die, a floating female die sleeve, a lower die assembly, a lower ejection rod and nitrogen springs; the floating female die is fixedly connected with the floating female die sleeve, the floating female die sleeve can vertically slide under limitation of a guide ring, and the lower ejection rod extends into a lower die core hole of the lower die assembly vertically upwards; the lower die assembly is arranged below the floating female die, and the nitrogen springs are evenly and fixedly arranged in the guide ring in a manner of surrounding the lower die assembly; and the upper extrusion punch is vertically fixed to the bottom of the upper die assembly, downwards extends in a suspended manner and conducts reversed extrusion on blanks arranged in the floating female die under the effect of a press. When the deep hole extrusion die is adopted for conducting cold forging extrusion, the hole diameter extrusion depth is 2.5 times to 5 times the hole diameter.

Description

technical field [0001] The invention belongs to the technical field of forging and forming, and relates to an extrusion die. Background technique [0002] At present, during the processing of cold forgings, it is often necessary to extrude a deep hole on the cold forgings. Some parts such as piston pins, track pins, and various pins used on automobile chassis are common deep-hole extrusion parts; there are also some parts such as automobile transmission sleeves, fork sleeves, and dehydration shafts of washing machines. The deep hole in is used as a preform before extruding splines, stepped rings or tubular parts. [0003] Deep hole extrusion is an unavoidable problem in cold extrusion technology. When the general hole is extruded, the ratio of hole depth to hole diameter is controlled below 2.5. When the extrusion depth of the hole diameter is 3-5 times the hole diameter, it is difficult to realize the conventional precision forging forming technology manufacturing process...

AI Technical Summary

Problems solved by technology

When the extrusion depth of the hole diameter is 3-5 times the hole diameter, it is difficult to realize the conventional precision forging forming technology manufacturing process, but the traditional cutting process is used for production. The cost is high, the consistency is poor, the production cycle is long, and the material is wasted. Secondly, the overall product strength is the same as that of the base material. The internal structure of the product manufactured by the traditional cutting process is loose, the strength is low, the quality is unstable, and the metal flow line of the material is cut off. reduce the comprehensive mechanical properties

Images