resulting in the bronze mold can not be repaired permanently disabled

Wear Failure to wear failure refers to loss of friction between the bronze mold the work site and the material being processed, the work site (edge punch) shape and size changes caused by the failure. It also include the failure of normal wear and tear and normal wear and tear failure of two types: normal wear and tear failure surface dimensions demanding cold stamping, cold extruded bronze molds, bronze die life depends on the surface, to ensure that the material does not fracture under the premise wear resistance. Uniformity between the friction loss in the bronze mold work site and the material being processed, the work site (edge punch) shape and size changes caused by the failure.
 Usually bronze mold service life is longer, such as surface quality requirements of stamping die, the extrusion die is easy to produce such failure. This bronze sculpture may be used to offer sacrifice to the mountains. Non-normal wear and tear failure the occlusal bronze dragon mold the work site and the material being processed in the local high pressure processing materials "cold welding" to the mold surface of bronze (or bronze mold material "cold welding" to the material surface), caused to be processed products (or bronze mold material) surface shape and size of a mutation, or lead to failure to serious scratches and other surface to be machined products. Prone to such failure in tensile, bending bronze molds and cold extruded bronze mold.
Fatigue failure periodically imposed a certain energy under  of this like the fatigue failure of the cold bronze mold load a certain impact velocity, the state with small energy repeated impact fatigue testing (cyclic loading to a certain energy and unloading). As the bronze mold materials washed fatigue fracture life of more than 1000 to 5000, usually crack fatigue source and the crack propagation no obvious boundaries. Antique Chinese bronze sculpture : Owl (xiāo) you. Bronze mold steel fatigue performance characteristics and structural steel. Because of the fatigue crack initiation of brittle materials accounted for most of life, in most cases crack initiation and propagation difficult to distinguish. Careful analysis of the morphology of fatigue striations seen that the crack initiation and more weak links in the material surface, such as grain boundary carbides and the stress concentration.
The tests showed that the impact of fatigue crack initiation by about 200? M micro-cracks, the life more than 90% of the total life, from the fracture surface difficult to observe the steady expansion area of structural steel and fatigue bands, crack produces rapid unstable growth. Peening of high-speed steel, the surface residual compressive stress, the crack source location and transferred to about 012mm at the sub-surface, to improve the surface stress state is the effective way to improve the repeated impact fatigue resistance. Repeated impact fatigue failure is common in the overloaded bronze molds, such as cold extrusion, cold heading red head bronze mold. You can find the imitation of this bronze sculpture on our website. bronze mold heat treatment bronze mold parts heat treatment blanking die, part of the heat treatment requirements: processing requirements blanking is one of the basic processes of cold pressing.  This loss prone to failure in a bronze mold for cold extrusion and cold heading punch fracture, cracking, and even produce the burst fracture in the steady state, characterized by failure to produce no obvious plastic deformation, the macroscopic fracture shear lip and relatively flat, resulting in the bronze mold can not be repaired permanently disabled. Strong enough failures in cold heading, cold extrusion punch material, compressive strength, bending resistance, easily upset head concave, bending failure. The bronze sculpture are the material carrier of the Shang civilization. Prone to such failure in new product development, and work load is too large, low bronze mold hardness related. Practical experience has shown that black metal cold heading punch hardness less than 56HRC cold extrusion punch hardness of less than 62HRC prone to such failure, an indication of the lack of strength of materials, plastic is more than the toughness potential can play.
Empirical methods to address such early failure of the bronze mold is brittle fracture failure to reduce hardness, deformation to failure increased hardness. The bronze sculpture decoration is the image annotation of civilization comment and the exuberant sense of life of the people in Shang.