摘要
45钢阀体挤压铸造模具设计为组合式模具。模具的模芯和冲头采用性能较高的H13钢，模套及定位结构部分采用45钢或40Cr钢。成形设备采用专用的挤压铸造液压机，最大挤压力为1500kN，最大锁模力为2000kN。上、下冲头取2。的起模斜度，侧冲头取了0．5。的起模斜度，冲头速度为0．30～0．35m／s。顶出方式采用下冲头上行直接顶出，冲头与模具之间的单边配合间隙取0．16～0．2mm。采用管道式冷却和插管式冷却相结合，对模具受到较大热应力的部分进行冷却。为了保证制件高度方向的精度，在分型面十字方位上开设有4个溢流槽。为了提高模具的抗熔焊能力，采用自制的硅藻土类绝热涂料，喷涂厚度为0．2～0．5mm。
45 steel valve body in extruded casting was adopted in designing combined mould, in which core and punch adopts H13 tool steel, and sleeve and poisoned structure uses 45# steel or 40Cr steel. And special extruded machine with maximum extruded force of 1 500 kN and closed forces of 2 000 kN is used with punch velocity of 0.30~0.35 m/s. Drawing-mould declination is 2°,2°and 0.5°for up-punch, down-punch and side-punch, respectively. And the down-punch directly pushes the castings for pushing ways, where fit clearance between punch and the mould is 0.16~0.2 mm. The position of the die subjected to higher thermal stress has been cooled by tube-cooling combining with inserted-pipe cooling. Four overflow slots on cross-position of parting surface have been set to ensure the accuracy of the casting in height direction. To improve fusion-resistant ability of the die, the coating with thickness of 0.2~ 0.5 mm using self-developed siliceous earth coating is conducted.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2006年第7期433-436,共4页
Special Casting & Nonferrous Alloys
基金
北京交通大学"十五"重大科研基金项目(230-12)
