Shanghai Daoqin Plastics Co., Ltd.

         can can formed hardness or non-uniform causes:

        1) mold large,钢材淬透 property 差,如 large type mold selection property low types.

        2) mold 钢原始组织 in carbon material 偏析严 heavy or coarse large,钢 in in carbon and carbon material 偏析, poly 集.

        3) mold process positive 确,锻造 rear 未进行 very good 球化退火, make mold 钢球化组织 defect.

        4) mold surface remove 净退火 or add hot generate carbon 层.

        5) mold temperature degree high,淬火 rear 残留奥氏体 amount more; or temperature degree low, add hot temperature time 不足, make mold versus 变不完 full.

        6) mold add hot rear cooling speed degree slow, separation grade and and other temperature temperature degree high or time long,淬火 cooling selection 不当.

        7) alkali water separation less, or cooling in 含杂质 more, or cooling aging.

        8) mold cooling rear 出淬火 cooling 介质时 temperature degree high, cooling 不足.

        9)回火不充 separation and temperature degree high and other.

        针 for above 9点 analysis causes,我们找 to for solutions.

        1) positive selection mold types, large type mold selection property high high alloy mold 钢.

        2) add strong/high Raw Materials 检查, ensure Raw Materials combined standards. for defect Raw Materials 钢材进行 combined 理 锻造并进行球化退火处理, ensure obtain good 组织. carbon tool easy more 次退火,以 anti 石墨化.

        3)严格执行锻造 process and 球化退火 process, ensure has good hot 处理组织.

        4) hot front 应彻底清 remove mold surface and oxidation 皮,并 attention/notes add hot 时 保护,尽 amount using/adopting true add hot or gas add hot 淬火, salt add hot 时应进行良 good oxygen 处理.

        5) positive made mold add hot process parameters, ensure versus separation,以 large 于临界 cooling speed degree cooling speed degree fast speed cooling,以 obtain combined 格 金 versus 组织.

        6) positive selection cooling and cooling methods,严格 control separation grade and and other temperature temperature degree and time.

        7) need control alkali water separation content, for long use cooling need 经常进行 滤 and more 换,并 maintain 清洁,定期 testing its cooling features 曲线.

        8) for dimensions large mold,适当延 long 浸入淬火 cooling time, anti mold 出淬火 cooling temperature degree high.

        9) mold rear and 时, separation 回火,并 anti 止回火 temperature degree high.

        10) for hardness requirements high mold can using/adopting deep cold 处理(如-110~-196℃).

        11)进行 surface strong/high 化处理.