Integrated molding method for the front fork of a bicycle

• Main Author: TSENG; SHAOIEN
• Format: Patent
• Language: English
• Published: 18.04.2000
• Edition: 7
• Subjects: AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKINGWITHOUT ESSENTIALLY REMOVING MATERIAL; CYCLE AXLE SUSPENSIONS; CYCLE FRAMES; CYCLE SIDE-CARS, FORECARS, OR THE LIKE; CYCLE STEERING DEVICES; CYCLES; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES,RIVETS, BOLTS OR WHEELS; MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES,OTHERWISE THAN BY ROLLING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PUNCHING METAL; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FORCYCLES; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TRANSPORTING; WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL

An integrate forming method for a front aluminum alloy fork of a bicycle, wherein, an aluminum alloy found round pipe having two elliptical pipe holes therein is selected as a blank and is formed an embryonic form of a pipe casting of the pipe head of the front fork by a milling process, then die cores are placed in the pipe casting then by using a sequential novel process including diameter reducing and tapering of the pipe head, a first stage forming, tapering of the branch pipes, a second stage forming, and bending forging etc., the front aluminum alloy fork can be integrately formed, in this way, the pipe head and the two branch pipes having extremely large variation of shape can be integrately formed, and the disadvantage of stress concentration in the conventional connecting and fixing technique can be gotten rid of, and good appearance as well as strength of the front fork can be improved by such a process.