Aiming at one-piece inline four-cylinder water-cooling diesel engine cylinder head

quartz pebble was chosen as molding material.The casting mould is made of resin coated sand shell

shell core and hot corebox sand.Mold compaction has been processed in a single flask with straight wall and with the aid of clamping plate on the top of the opening flask.HT250 inoculated cast iron was poured in gravity casting with bottom and open gating system

which realized non-joint flash

&

non-fins in mold parting and non-air vent riser in mold cavity.The practical production reveals that roughness of casting surface feature reaches Sa=11.89μm

and tensile strength and hardness of the castings reach 265.2 MPa and209 HB

respectively.Graphite morphology and graphite size grade in the casting matrix structure belong to A type and 3

4

grade

respectively

and the content of pearlite and sorbate are more than 98%.In addition

product yield and overall yield reach 95%and 85%

respectively.Sand metal ratio may be 1∶1

and recycling ratio of quartz pebble and shell core precoated sand are more than 90%.