Shanghai Daoqin Plastics Co., Ltd.

        挤 pressure mold belongs to types molding mold, this is types 无切削 precision plastics formed process methods, its add hot temperature degree room temperature and full inner crystallization temperature degree (钢 iron material 200-850℃) between. pressure formed parts strong/high degree high, rigid property good, weight light,精 degree and surface coarse degree already machine processing. 当我们 use pressure mold need attention/notes below/following large 事项.

        1, mold material

        挤 pressure mold as ring process in, due to to high temperature, high pressure and 交变载荷 function, requirements mold tool has strong/high degree, hardness high, tough property, wear resistance and hard property good and other. specific is:

        1) low temperature (200-400℃)挤 pressure 时, selection 3Cr3Mo3W2V, W18Cr4V, W6Mo5Cr4V2 and other.

        2) in temperature (400-500℃)挤 pressure 时, selection 4Cr5MoSiV, 4Cr5W2SiV, 5CrNiMo and other.

        3) high temperature (500℃ above)挤 pressure 时, selection 5Cr4Mo3SiMnVAl, 6Cr4Mo3Ni2WV, 3Cr3Mo3W2V, 9Cr6W3Mo2V2.

        2, mold structure

         in mold structure design 时,应考虑 mold structure can can has metal flow, mold 各部位受 force uniform,充 separation type 腔断面形状,工 as separation light slip 连接,尽 can can 避免尖角, narrow formed force in 源, anti hot and pressure process cracking phenomenon.

        3, surface strong/high tough 化处理

        应 using/adopting combined strong/high tough 化处理 and surface strong/high 化处理, make mold obtain good overall strong/high tough property and high surface hardness, wear resistance and resistant viscous film property can, has improve/increase mold use lifespan. 如,Cr4W2Mo2V temperature pressure process:形变余 hot positive 火处理(960℃, temperature 1.5h)+ and other temperature 球化退火(900℃, temperature 5h)+ high temperature 淬火(1000-1050℃, 油淬)+ high temperature 回火(560-580℃, 1.5h)+S-C-N ternary process 进行复核 strong/high tough 化处理. again 如3Cr2W8V temperature pressure mold: use 1100℃ add hot temperature 出炉预 cold 2-3min, again 放入50%K2NO3+50%Na2NO3 salt in,390℃保 temperature 0.5h出炉空 cold room temperature and other temperature add 560℃×2h回火两次.

        4, decrease and lubricated methods

         is decrease/reduce mold surface and material 直接接触, in mold or surface lubricating coating lubricant decrease/reduce scratch,也 can improve/increase hot property. add hot front coating also can decrease/reduce oxidation and carbon. production in 发现: oxidation 硼+石墨, oxidation 硼+二硫化钼, water or agent, 石墨+二硫化钼+油 acid, silicon 砂+ oxidation aluminum +硼 acid and other lubricant,都 can 取 良 good lubricated 效果.