Processing die and preparation method for fastener

A method for processing a fastener by using a processing die, wherein the processing die comprises a punch and a die which are assembled, a top of the punch and a bottom of the die are configured for being installed on a hydraulic press, the die comprises a first half die and a second half die which are clamped to form an inlet channel, an expansion corner channel and a torsion channel, a forming sliding block is included in the die, an extrusion channel is included in the forming sliding block, a shape of the extrusion channel is configured to match with that of the fastener, the inlet channel, the expansion corner channel, the torsion channel and the extrusion channel are sequentially assembled to form a die channel cavity, and a billet to be processed is successively subjected to upsetting in the inlet channel, shearing in the expansion corner channel, torsion in the torsion channel and extrusion in the extrusion channel under a pressure of the punch, and wherein the first half die and the second half die contain a sliding block hole respectively, the sliding block hole is wedge-shaped, the forming sliding block and a sliding block baffle are installed into the sliding block hole, and the sliding block baffle is assembled to the forming sliding block;

• an air leakage hole is formed in the sliding block hole and communicates with atmosphere;
• the forming sliding block and the sliding block baffle are detachably connected with the first half die or the second half die via loaded bolts, respectively;
• limiting side plates are respectively installed on two sides of the forming sliding block and the sliding block baffle, and detachably connected with the first half die or the second half die via side plate bolts;
• and
• axes of the loaded bolts are perpendicular to axes of the side plate bolts;
• the method comprising following steps:
• manufacturing the processing die of a fastener to be processed according to a geometry of the die channel cavity;
• assembling the processing die, installing the die on a workbench of the hydraulic press, and installing the punch on an upper sliding block of the hydraulic press;
• preheating the processing die, and heating the billet to be processed and performing heat preservation treatment;
• placing the billet to be processed into the inlet channel, starting the hydraulic press, moving the punch downwards to a predetermined height, and returning the hydraulic press;
• removing the forming sliding block from the die;
• removing the processed fastener from the forming sliding block;
• replacing a new forming sliding block;
• repeating a process from placing the billet to replacing the forming sliding block.