CN1096721A

CN1096721A - Vertical core-assembly casting process

Info

Publication number: CN1096721A
Application number: CN 93107163
Authority: CN
Inventors: 叶斌华
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-06-19
Filing date: 1993-06-19
Publication date: 1994-12-28

Abstract

A kind of vertical core-assembly casting process is to be prefabricated into some cores and corresponding auxiliary part with molding sand, at casting bed level stack core, forming surface is reclined, constitute the some die cavities that meet the foundry goods shape mutually, adopt this technology to need not box moulding, the foundry goods shrinkage is even, appearance and size is accurate, surface smoothness improves, and under equal operating condition, the present invention improves 5～10 times of effects, yield rate reduces cost 15～30% more than 96%.

Description

Vertical core-assembly casting process

The present invention relates to a kind of technology of casting field, be specially adapted to the casting of oblate foundry goods.

Traditional casting technique generally adopts sandbox and melt pit monomer plane, greensand mo(u)lding, the technology casting of riser feeding.Because the effect that green sand mold directly bears molten metal produces volume contraction during the metallic solution cooling, folds graphite when solidifying and can produce volumetric expansion again, produce a large amount of gases during casting, thereby foundry goods is easy to generate defectives such as pore, burning into sand, shrinkage cavity.For the rate of reducing the number of rejects and seconds, often need to strengthen allowance, the molten iron utilization rate is reduced.The rising head that also needs during cast to place various different bores carries out feeding, and using rate of metal descends like this, and cost rises, and operating efficiency is not high, does not still have new casting technique so far and solves above-mentioned technical barrier.

The purpose of this invention is to provide a kind of change conventional cast mode, the traditional handicraft of sandbox monomer moulding single-piece riser feeding is changed into need not box moulding, many core assemblies, no rising head upright casting new technology.

Invention is achieved in that to give with molding sand makes a down gate 8, the horizontal groove 2 that waters, plural core 7, with ingate 3 that equates with core 7 quantity and monitoring mouth 6, on smooth casting bed, bury then and put the horizontal groove 2 that waters, ingate 3 swings are placed on the runner gate 2, several core 7 forming surface are reclined perpendicular to casting bed 1 mutual level and be listed in each ingate 3 tops, each ingate 3 is communicated with each die cavity 5 with the horizontal groove 2 that waters, the monitoring mouth 2 that communicates with the die cavity 5 of each core 7 is placed on core 7 end faces, at last down gate 8 is stood upright on the horizontal of core assembly one side and waters on the groove 2.Type shape with 1 foundry goods during prefabricated core 7 is molded on two opposite faces of a core 7 simultaneously, when n core face face successively leans on mutually, can constitute n-1 die cavity 5 that meets the foundry goods shape simultaneously.Metallic solution enters from down gate 8, and through the horizontal groove 2 that waters, ingate 3 is assigned to each die cavity 5.

Core 7 reclines mutually foundry goods can slowly be cooled off in die cavity 5, move after even and time of foundry goods cooling volume contraction is corresponding, and graphite is separated out fully, volumetric expansion shifts to an earlier date again relatively, so just impel shrink with the stack of expanding complementary, thereby realized that equilibrium solidifies and do not have a box moulding.Be provided with monitoring mouth 6 on the foundry goods top, both be beneficial to and discharged gas and scum silica frost, the internal stress that produces when utilizing heat radiation for graphitization expansion does not again leak and has created condition, has overcome big riser feeding disturbs generation casting deformation and hot tearing to the heat of foundry goods defective.

Working of an invention example: (seeing accompanying drawing).

This scheme comprises: rectangle melt pit or casting bed 1, and the horizontal groove 2 that waters that casting bed bottom level placed type core sand is made, ingate 3 places horizontal watering on the groove 2, and is connected with casting mold core 7.According to actual needs some ingates 3 and casting mold core 7 are combined into many casting mold body.Place monitoring mouthfuls 6 at core 7 end faces, be sidelong and put down gate 8 at horizontal one of the notch 2 that waters, thereby finished the combination of whole sand molds, realized that no sandbox makes up the purpose of many casting.

Characteristics of the present invention are: owing to adopted the moulding of the many body stacks of no sandbox core assembly casting bed, solve the traditional handicraft medium casting and produced easily pore, shrinkage porosite, distortion and the defective of scrapping, yield rate can reach about 96%, the surface smoothness of foundry goods and the accuracy of physical dimension have also been improved simultaneously, the monolateral allowance of machined only is 2～3 millimeter, thereby reduced the weight of strand, ironcasting can be saved molten iron 10%～25% for above-mentioned reasons, reduce cost 15%～30%, under the long-pending prerequisite of equal sand scene, adopted production efficiency of the present invention can improve 5～10 times.

Claims

1, a kind of vertical core-assembly casting process, it is characterized in that giving and make a down gate 8 with molding sand, the horizontal groove 2 that waters, plural core 7, with ingate 3 that equates with core quantity and monitoring mouth 6, on smooth casting bed, bury then and put the horizontal groove 2 that waters, ingate 3 is placed on the runner gate 2, each ingate 3 tops are leaned on and be listed in to several core 7 forming surface perpendicular to casting bed 1 mutual level card, each ingate 3 is communicated with each die cavity 5 with the horizontal groove 2 that waters, the monitoring mouth 2 that communicates with the die cavity 5 of each core 7 is put core 7 end faces, at last down gate 8 is stood upright on the horizontal of core assembly one side and waters on the groove 2.

2, a kind of vertical core-assembly casting process according to claim 1, it is characterized in that the type shape of 1 foundry goods is molded on two opposite faces of a core 7 simultaneously, when n core face face successively leans on mutually, can constitute n-1 die cavity 5 that meets the foundry goods shape simultaneously.