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连杆螺钉和螺堵镦锻下模是资阳内燃机车厂锻压分厂160t摩擦压力机上使用量最大的模具。过去一直采用T7、T8、5CrNiMo、5CrMnMo、3Cr2W8等碳素工具钢和热作模具钢制造。由于模具韧性较差,承受交变应力的能力较低,螺钉镦锻下模的平均使用寿命为900～1000件,失效形式主要为破裂和裂纹。螺堵镦锻下模的平均寿命为650～700件,失效形式主要是裂纹和磨损变形。 42CrMo具有冲击韧性大、强度高、淬透性好的特点。用42CrMo钢制造镦锻下模主要失效形式是隆起变形,一般的隆起变形可利用上模落下时,轻轻地空击将其压平,略加修整便可重新使用。
Connecting rod screw and screw plug upset forging die is Ziyang Diesel Locomotive Works forging press 160t friction press the largest amount of mold. The past has been used T7, T8, 5CrNiMo, 5CrMnMo, 3Cr2W8 and other carbon tool steel and hot work die steel. Due to the poor toughness of molds, the ability to withstand alternating stress is low. The average service life of the upsetting dies is 900-1000, and the failure modes are mainly ruptures and cracks. The average life span of screw plug upset forging dies is 650 ~ 700 pieces, the main failure modes are cracks and wear deformation. 42CrMo has a large impact toughness, high strength, good hardenability characteristics. With 42CrMo steel upsetting the main form of failure is the uplift deformation of the bulge, the general deformation of the bulge can be used to fall on the mold, gently empty the air to be flat, slightly modified can be re-used.