This bronze sculpture is currently the only remaining a national treasure

Note that the symmetrical fastening tighten the screws and do not step to gradually put in place in order to maintain equilibrium. Upper and lower mold together installed, you should check ball cage stretched length. Punching dead center position, the ball cage most row of the ball is not exposed to the guide sleeve, close to flush with the face is appropriate.
 loaded punch after punch 2.1.2 load the punch bronze mold assembled in the tool room, if the mold and punch table positioning as the installation base, the mold is first fitted with locating pins and fixed under the slider screws, and then lower and lower, until there are 0.5 ~ 0.8mm gap between the block and mold, the mold with the slider set screw and then loaded on the first hand to tighten the holding into (Jog ) way to slightly raise the punch slider together with the upper mold rack, under the action of 3 to 4 times, then tighten the fixing screws. Since then, the body of this precious bronze sculpture  was missing. For mold and slider positioning as the installation on the basis of the steps above the opposite. Bronze mold installation, the first single-action presses, confirm mold can work properly only after stamping.
 With regard to the cutting process program after the cold stamping bronze mold processing technology improvements 2.2.1 improve a rolled blank (or casting and rolling pressure rough) to heat to forging to into the cold bed breeze (or mist) quench cooling (cooling rate control in 20 to 45 ° C / min) under certain temperature to bainite isothermal transformation 25min air-cooled to 280 ~ 220 ℃ to pit insulation to about to tempering (Note that the control of temperature and time) to buried in sand insulation cooling to sampling. 2.2.2 Improved process program metal mold pressure casting? Into a cold bed breeze (or mist) to quench (cooling rate is controlled at a certain temperature of 20 to 45 ° C / min) to bainite isothermal transformation 25min air-cooled to 280 ~ 220 ℃ to pit insulation to about to tempering (Note that the control of temperature and time) to buried in sand insulation cooling to sample tests. Antique Chinese bronze sculpture : Cattle Zun.
Cold bronze mold main failure form of quality control of cold-working bronze mold the main failure of the form set out failure, wear failure and fatigue failure, typical failure shape are discussed below. 2.3.1 overload failure 2.3.1 overload failure overload failure means the material carrying capacity enough to resist the work load caused by (including about 10% of the random fluctuations in the load) the role of failure, the including toughness inadequate and insufficient strength of two types of failure. This bronze sculpture  is currently the only remaining a national treasure.  Which the failure of brittle fracture toughness insufficient attention should be paid. insufficient material toughness failure no macroscopic signs of such failure and fracture of sudden cold-working bronze mold failure is the most dangerous accidents in the past a result of such failure, there had been personal accident, to the production of safe and economic construction. resulting in great loss. Assembly, the template surface can not be there are dirt, otherwise cause misalignment. Assembly between the template with the two locating pins, two positioning pins to ensure their mutual position, so pay attention to the locating pin into the depth, in order to ensure its effectiveness, the positioning pin cylindrical wear should be replaced. Assembly bronze mold, the first template to fit together at the positioning pin sets together with brass holding or plastic hammer to gently template knocked flat close together, and then tighten the screws first hand screw, then tighten with a spanner. This is the only one existed elephant zun of Grade One among the preserved bronze sculpture .