Process for manufacturing motorcycle lower yoke plate
The invention relates to a process for manufacturing a motorcycle lower yoke plate. The process includes the steps of conducting early-stage manufacturing of a die to make early-stage preparation for forging and stamping, conducting forging and stamping forming to forge and stamp the die into a lower yoke plate finished product, conducting heat treatment to improve hardness of the lower yoke plate, conducting shot blasting to remove oxide skins which are formed on the surface of the lower yoke plate due to forging, stamping and heating, conducting flaw detection to ensure that the surface of the product is free of cracks, and conducting rust preventive packaging to prevent rusting. According to the process, secondary quench hardening is conducted on the die, and therefore the hardness of the die is improved, the material walking effect in the forging and stamping process is improved, and a heat treatment method is suitable for dies which work at the temperature ranging from 400 DEG C to 450 DEG C. 1. A process for the production of lower plate of the motorcycle, characterized in that the production process comprises the steps of: 1) die early manufacturing, make preparations for the forging; 2) forging and molding, forging and a finished product of the lower plate; 3) heat treatment, hardness of the lower yoke plate; 4) shot-blasting, remove the lower plate surface due to forging heating formed by oxidation of skin; 5) inspection, no cracks ensure the product surface; 6) anti-rust packing, in order to prevent rusting, Wherein the mould for manufacturing includes the preliminary processing becomes the pillar to mold die steel rolling mill, the forming die, the cutting die and the pillar molds , forming die, cutting die is subjected to a heat treatment, forging and molding includes the steps of blanking, heating, pillar semifinished product , forming, trimming, to the pillar molds , forming die, cutting die of the heat treatment including: 1) in the mould 1090 ±10 °C for quenching, quenching time 60 minutes; 2) oil cooling to the mold after quenching the 100 [...] ; 3) the position of the oil cooling after the tempering 480 ±10 °C, tempering time of 180 minutes; 4) in the air cooling of the die; 5) tempering 230 ±10 °C, Wherein the quenching furnace and the tempering furnace panega ozokerites, barium carbonate prevent decarburization. 2. Process for the production of lower plate of the motorcycle according to Claim 1, characterized in that said flaw detection by magnetic particle inspection machine flaw lower plate, rust-proof package comprises a pair of lower yoke plate on the lower plate and packing.