CN208321989U - The molding sand surface layer structure of piece core and casting mould - Google Patents

Abstract

The utility model relates to casting technology fields, provide a kind of piece core, including the core box surrounded by a circle side wall；Two layers of molding sand layer is filled in the core box, including being located at base's molding sand of core box internal layer and positioned at the surface layer molding sand of core box outer layer.The molding sand surface layer structure of casting mould, including be spliced by multiple piece cores.Piece core described in the utility model, structure is simple, easily manufactured, when manufacturing piece core, can control the thickness of surface layer molding sand, improves the utilization rate of surface layer molding sand.The molding sand surface layer structure of the casting mould of the utility model, it is spliced by multiple piece cores, the Special type layer of sand of piece core is set to become the molding sand surface layer of entire casting mould, make the consistency of thickness of molding sand surface layer, guarantee castability, the service efficiency for improving chrome ore reduces the usage amount of chrome ore in single-piece casting, reduces production cost.

Description

The molding sand surface layer structure of piece core and casting mould

Technical field

The utility model relates to casting technology field, in particular to the molding sand surface layer knot of a kind of piece core and casting mould Structure.

Background technique

Chrome ore is also known as chromite sand, is casting special sand, is the natural spinelle based on chromite, be crushed, It grinds, be sieved into designated size, the sand suitable for moulding.Chrome ore is heated volume stability, and thermal conductivity is high, contacts with molten metal When, not only there is good alkali resistance slag to act on, not with the chemically reactives such as iron oxide, and spy with solid-phase sintering itself Point can prevent the infiltration of molten metal well, avoid generating scab defect.

Therefore, chrome ore is mainly used for the facing sand of large-scale steel-casting in Foundry Production, prevents scab；Chrome ore Sand or chill material, the alternative part chill in coremaking.In current modeling process, the mode adhered to by hand is generallyd use Facing sand is laid in the more expensive chrome ore of price, such adhering mode often has the following problems: facing sand laying depth is not One, arbitrariness is also big, has much relations with the experience and habit of operator；Facing sand laying is too thin, causes surface quality of continuous castings bad； Facing sand laying is too thick, causes moulding cost too high.

Utility model content

The technical problem to be solved by the utility model is to provide a kind of piece cores that can control facing sand thickness.

The technical scheme adopted by the utility model to solve the technical problem is as follows: piece core, including surrounded by a circle side wall Core box；Two layers of molding sand is filled in the core box, including being located at base's molding sand of core box internal layer and positioned at the face of core box outer layer Stratotype sand.

Further, the outer profile of the piece core is cuboid.

Further, base's molding sand is quartz sand molding sand.

Further, the surface layer molding sand is chrome ore molding sand.

The molding sand surface layer structure of casting mould is spliced by multiple piece cores；Each piece core includes by a circle side wall The core box surrounded；Two layers of molding sand is filled in each core box, including being located at base's molding sand of core box internal layer and being located at core box The surface layer molding sand of outer layer.

Further, there is filling gap between adjacent piece core；Molding sand is filled in the filling gap.

The beneficial effects of the utility model are: piece core described in the utility model, structure is simple, easily manufactured, is making When making piece core, the thickness of surface layer molding sand can control, improve the utilization rate of surface layer molding sand.The type of the casting mould of the utility model Sand surface layer structure is spliced by multiple piece cores, and the surface layer molding sand of piece core is made to become the molding sand face of entire casting mould Layer makes the consistency of thickness of molding sand surface layer, guarantees castability, improves the service efficiency of chrome ore, reduce in single-piece casting The usage amount of surface layer molding sand, reduces production cost.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of piece core in the utility model；

Fig. 2 is the top view of Fig. 1；

Fig. 3 is the top view of the molding sand surface layer structure of casting mould in the utility model.

Appended drawing reference in figure are as follows: 1- piece core, 3- fill gap, 101- core box, 102- base molding sand, 103- surface layer type Sand.

Specific embodiment

The present invention will be further described with reference to the accompanying drawings and examples:

As shown in Figure 1 to Figure 3, piece core described in the utility model, including the core box 101 surrounded by a circle side wall；Institute It states filled with two layers of molding sand in core box 101, including being located at base's molding sand 102 of 101 internal layer of core box and positioned at 101 outer layer of core box Surface layer molding sand 103.

The outer layer of the core box 101 refers to that layer directly contacted in use with cast, core box 101 Internal layer refers to that layer not contacted in use with cast.Piece core 1 described in the utility model, structure letter Single, easily manufactured, when manufacturing piece core 1, the thickness of the preparatory control plane stratotype sand 103 of energy improves the utilization of surface layer molding sand 103 Rate reduces production cost.

Base's molding sand 102 is quartz sand molding sand, and the surface layer molding sand 103 is chrome ore molding sand.Quartz sand has multiple It is good with property, widely distributed, low-cost feature.Therefore, quartz sand molding sand is set by base's molding sand 102, can reduced entire raw Produce cost.Surface layer molding sand 103 is directly contacted with cast in use, and chrome ore molding sand has refractoriness height, casting When it is non-fusible, thermo-chemical stability is good, does not react with molten steel and oxide, and heat storage coefficient is higher, and thermal conductivity is good, can accelerate casting Surface solidification, without acutely expanding caused by phase transformation, thermal expansion coefficient is small, has many advantages, such as solid-phase sintering characteristic.Therefore, by face Stratotype sand 103 is set as chrome ore molding sand, can prevent the infiltration of molten metal opposite stratotype sand 103, avoids cast from generating viscous Sand defect.The surface layer molding sand 103 can also be white sand molding sand, chrome ore molding sand, magnesia-chrome sand molding sand, aluminium silicon systems molding sand etc..

For convenience of operation, the shape of the piece core 1 in splicing is reduced to the greatest extent, the outer profile of the piece core 1 is rectangular The bodily form.

The molding sand surface layer structure of casting mould is spliced by multiple piece cores 1；Each piece core 1 includes by a circle side The core box 101 that wall surrounds；It is filled with two layers of molding sand in each core box 101, base's molding sand including being located at 101 internal layer of core box 102 and positioned at 101 outer layer of core box surface layer molding sand 103.Thus making the surface layer molding sand 103 of piece core 1 becomes entire casting die The molding sand surface layer of tool not only makes the consistency of thickness of surface layer molding sand 103, guarantees castability, and improve the use of chrome ore Efficiency reduces the usage amount of chrome ore in single-piece casting, reduces production cost.

Preferably, there is filling gap 3 between adjacent piece core 1；Type is filled in the filling gap 3 Sand.Filling can be stuffed entirely with quartz sand molding sand in gap 3, can also be stuffed entirely with chrome ore molding sand, can also be one layer of stone Sand molding sand and one layer of chrome ore molding sand.

The process for carrying out moulding using the piece core 1 of the utility model is as follows: firstly, according to the size design of mold cavity The specification and quantity of required core box 101；Be it is easy to operate, reduce the specification of core box 101 to the greatest extent.Then according to designed The prefabricated piece core 1 of core box 101, is first laid with one layer of chrome ore molding sand layer, the thickness of chrome ore molding sand layer is according to casting in core box 101 The thickness for making technique requirement is laid with, while consolidation guarantees the intensity of sand mold；Then silica sand layer of sand is re-layed, according to founder Skill require lay breather cord and lifting with hang and reserve mouth of a river channel.After the solidification of piece core 1, moulding is carried out, according to most First design scheme corresponds and is laid with piece core 1, specifically contacts the chrome ore molding sand layer of piece core 1 with the surface of model, After the completion, quartz sand molding sand is being filled in filling gap 3 and between outline border and piece core 1, while consolidation guarantees the strong of sand mold Degree, after final sand solidified, then the operation such as carry out modulus, brushing paint.

Claims (6)

1. piece core, it is characterised in that: including the core box (101) surrounded by a circle side wall；Two are filled in the core box (101) Stratotype sand, including being located at base's molding sand (102) of core box (101) internal layer and being located at the surface layer molding sand of core box (101) outer layer (103)。

2. piece core according to claim 1, it is characterised in that: the outer profile of the piece core (1) is cuboid.

3. piece core according to claim 1 or 2, it is characterised in that: base's molding sand (102) is quartz sand molding sand.

4. piece core according to claim 1 or 2, it is characterised in that: the surface layer molding sand (103) is chrome ore molding sand.

5. the molding sand surface layer structure of casting mould, it is characterised in that: be spliced by multiple piece cores (1)；Each piece core (1) Including the core box (101) surrounded by a circle side wall；It is filled with two layers of molding sand in each core box (101), including is located at core box (101) base's molding sand (102) of internal layer and the surface layer molding sand (103) positioned at core box (101) outer layer.

6. the molding sand surface layer structure of casting mould according to claim 5, it is characterised in that: adjacent piece core (1) it Between have filling gap (3)；Molding sand is filled in the filling gap (3).