Patent ID: 7833364
Filing Date: 2010-11-16
Classification: B21C,C22F,F16D

Abstract:
1. A method for producing bicycle ratchet bushing, comprising a modeling process and detailing treatment wherein: the modeling process further comprising: an extrusion process: an alloyed fundamental material is heated and then conveyed to an ingot vessel; the ingot vessel having a first opening and a second opening, wherein, a molding rod is inserted into the first opening, and a mold is installed at the end of the molding rod; a pressing rod is placed at the second opening which is used for pressing the alloyed fundamental material to pass through the mold to become an extruded material; a solid solution treatment: the extruded material is further heated to a solute temperature with some time and quenched in a coolant; a drilling and tapping process: one end of the extruded material which has been treated by the aforesaid solution treatment is drilled and tapped to form a tapped hole, the size of the tapped hole is smaller than the extruded material and a screw rod is screwed in the tapped hole; a drawing process: the screw rod which is screwed into the tapped hole is further penetrated through the mold and clamped by a drawing machine and the extruded material proceeds with the drawing process; after the process of drawing is completed, the screw rod is released from the tapped hole of the extruded material; an artificial aging treatment: the extruded material, which has been drawn, is further heated to a temperature with some time to harden the extruded material; and a cutting process: the extruded material, which has been treated by aging process, is further to be cut into a required length; and the detailing treatment further comprises: a turning or drilling process: the extruded material, which has been cut in length, is further proceeded to the turning process or drilling process with respect to the external diameter, internal diameter and screw thread of the extruded material; and a surface treatment: the extruded material, which has been turned and drilled, is further processed to the surface treatment to form a product of bicycle ratchet bushing.