15-year precision mould making

 Some mold in the process of work is in a state of repeated heating and cooling, the cavity surface tension, pressure and stress effect, cause surface cracking and spalling, increase the friction, obstacles to plastic deformation, reduces the dimension precision, resulting in the mould failure.Cold and hot fatigue is one of the main form of hot-work die failure, help the mould should have high resistance to cold and hot fatigue performance.The following three principle of plastic mold parts material of choose and buy.
 (1) the corrosion resistanceSome mould such as plastic die on the job, as a result of the elements such as chlorine, fluorine plastics, thermal decomposition analysis after HCI, HF, such as strong erosion gas, erosion surface of mould cavity, increasing its surface roughness, aggravate the wear failure.
 (2) satisfies the requirement of process performance
Mould manufacturing is typically after forging, machining, heat treatment, and a few procedure.To ensure the High-quality mold work components manufacture, reduce production cost, the materials should have good malleability, cutting machining, hardenability, hardenability and grinding;Also should have little oxidation and decarburization sensitivity quenching distortion and cracking tendency.
 1, malleability
Have relatively low hot forging deformation resistance, good plasticity, forging temperature range wide, cold forging crack crack and precipitation carbide network tend to be low.
 2, annealing process
Wide temperature range and spheroidizing annealing annealing hardness is low and the fluctuation range is small, spheroidization rate is high.
 3, cutting machining
Low cutting parameter, cutting tool wear and tear, lower surface roughness.
 4, oxidation and decarburization sensitivity
When heated to high temperature oxidation resistance with good, decarbonization speed slow, is not sensitive to the heating medium, produce pitting tend to be small.
 5, hardenability
A uniform and high surface hardness after quenching.
 6, hardenability
After quenching can get deeper hardening layer, the ease of quenching medium can be hardened.
 7, quenching deformation cracking tendency
Conventional quenching small volume change, shape warping, distortion mild, abnormal deformation tend to be low.Conventional quenching cracking sensitivity is low, is not sensitive to quenching temperature and shape of the workpiece.
 8, grinding can be
Limit dosage of grinding wheel relatively low loss, no burns, insensitive to the quality of grinding wheel and cooling conditions, are less grinding and grinding cracks.
 (3) satisfies the requirement of economyEconomy must be taken into account  in  plastic mold parts material of choose and buy, this principle, as far as possible to reduce the manufacturing cost.Therefore, on the premise of meet the performance, first choose low price, you won't have to alloy steel with carbon steel, can use domestic material don't have imported materials.