CN209811157U

CN209811157U - Pouring system for complex castings

Info

Publication number: CN209811157U
Application number: CN201920425852.3U
Authority: CN
Inventors: 眭怀明; 杨晓楠; 王俊升; 贺从波; 张为平
Original assignee: Yangzhou Feng Ming Photoelectric New Material Co Ltd
Current assignee: Yangzhou Feng Ming Photoelectric New Material Co Ltd
Priority date: 2019-04-01
Filing date: 2019-04-01
Publication date: 2019-12-20
Anticipated expiration: 2029-04-01

Abstract

The utility model relates to a gating system of complicated foundry goods belongs to magnesium alloy casting technical field. The pouring system comprises a pouring cup and a casting cavity, wherein the casting cavity comprises an upper thick large part, a middle thin wall part and a lower thick large part which are sequentially communicated from top to bottom, the bottom of the pouring cup is connected with a sprue extending vertically downwards, the bottom of the sprue is communicated with the joint part of a front transverse runner and a rear transverse runner, the front transverse runner and the rear transverse runner are in axial symmetry distribution, the front transverse runner extends forwards and rightwards and is connected with the front side of the lower thick large part, the rear transverse runner extends backwards and rightwards and is connected with the rear side of the lower thick large part, the top of the upper thick large part is connected with a riser, and riser heat-insulating cotton is wrapped on the periphery of the riser; the periphery of the middle thin-wall part is provided with thin-wall part heat-insulating cotton, the outer side and the bottom of the lower thick part are both provided with a chiller shell, and the inner cavity of the chiller shell is provided with high-temperature paraffin. The gating system adopts different feeding structures for different thick parts, is convenient to use and low in cost, and has high qualified rate of castings.

Description

Pouring system for complex castings

Technical Field

The utility model relates to a foundry goods gating system, in particular to gating system of complicated foundry goods belongs to metal casting technical field.

Background

The casting of the magnesium alloy is usually sand casting, and the magnesium alloy liquid is poured into a sand mold cavity which is adaptive to the shape of the part, and after the magnesium alloy liquid is cooled and solidified, a blank or the part is obtained. A large amount of heat radiation can be generated during casting, a large amount of water vapor can be generated after the heat radiation reacts with cold air in a sand mold, the gas needs to be rapidly discharged from the sand mold, and the gas is usually discharged and fed in a mode of arranging a dead head at the highest position of a casting and the like.

Due to the reasons of structure, casting parameters and the like, the solidification time of molten metal in different parts in a molten state in a mold cavity is unequal, so that thermal stress is generated after a casting is solidified, and the casting is deformed and cracked. During the solidification of the molten metal, the nodes or local areas in the casting that solidify more slowly than the surrounding metal are called casting hot spots, which are the locations in the casting where the metal finally cools and solidifies. It is often necessary to provide chills at the hot junctions to increase the cooling rate at the hot junctions.

Many castings have thick and large parts which are difficult to feed, a riser is still used for feeding in the traditional gravity casting process, if the thick and large parts are placed at the riser, a very large riser needs to be arranged, and the large riser can cause a large amount of waste of alloy liquid. In addition, for complex castings with more than one thick large part and two thick large parts connected through thin-wall parts, the thick large part at the lower part cannot be fed through a riser due to structural problems, and a hot spot cannot be completely eliminated through a chill, so that the yield of the castings is low.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the problem that exists among the prior art, provide a gating system of complicated foundry goods, take different feeding structure to the thick major part position of difference, convenient to use, low cost, and the qualification rate of foundry goods is high.

In order to solve the technical problem, the utility model discloses a gating system of complicated foundry goods, including runner cup and foundry goods die cavity, the foundry goods die cavity includes upper thick major part, well thin wall portion and the lower thick major part that top-down link up in proper order, the bottom of runner cup is connected with the vertical downwardly extending's sprue, the bottom of sprue is linked together with the junction of preceding, back sprue, and preceding, back sprue are the axisymmetric distribution, and preceding sprue extends forward right and is continuous with the front side of lower thick major part, and back sprue extends backward right and is continuous with the rear side of lower thick major part, the top of upper thick major part is connected with the rising head, the periphery of rising head parcel has the riser heat preservation cotton; the periphery of the middle thin-wall part is provided with thin-wall part heat-insulation cotton, the outer side and the bottom of the lower thick part are both provided with a chiller shell, and the inner cavity of the chiller shell is provided with high-temperature paraffin.

Compared with the prior art, the utility model discloses following beneficial effect has been obtained: and molten metal enters from the sprue cup, flows downwards to the cross gate along the sprue, flows to the front side and the rear side of the lower part of the casting cavity along the front cross gate and the rear cross gate respectively, is filled with the lower thick large part, the middle thin-wall part and the upper thick large part in sequence, and finally is ejected from the riser, and the top of the riser is level to the top of the sprue cup. A riser is arranged above the upper thick part, and riser heat-insulating cotton is wrapped on the periphery of the riser, so that the cooling time of the riser can be effectively prolonged, the feeding capacity of the riser is improved, the use of the riser with larger size is avoided, and the waste of molten metal is reduced; secondly, the lower thick part is far away from the riser, and the thin-wall heat-insulating cotton is arranged at the thinner part of the middle part to slow down the cooling of the part and realize feeding of the lower thick part; in addition, the outer side and the bottom of the lower thick part are both provided with a chiller shell, and the chiller shell is usually made of aluminum and has good heat-conducting property, so that the cooling of the lower thick part can be accelerated; the high-temperature paraffin in the chiller shell is heated to melt, so that a large amount of heat is absorbed, and the chilling effect of the chiller can be further enhanced. The pouring system adopts different feeding structures for different thick parts, is convenient to use and low in cost, and can improve the qualification rate of castings.

As a further improvement of the utility model, the bottom of the joint part of the front and the rear horizontal runners is provided with a filter tank which is sunken downwards. The filter screen in the filter tank can intercept scum in the molten metal, so that the scum is prevented from entering the cavity, and the quality of the casting is improved; the bottom of the filter tank is sunken downwards to buffer descending molten metal.

As the improvement of the utility model, the right-hand end dead ends of the front horizontal pouring channel and the rear horizontal pouring channel are respectively provided with a slag collecting riser extending upwards. A small amount of scum still exists in the filtered molten metal sometimes, and when the scum flows to the blind ends of the right ends of the front horizontal pouring channel and the rear horizontal pouring channel, the scum upwards enters the slag collecting dead head for storage, so that the scum is prevented from entering the cavity, and the quality of castings is improved.

Drawings

The invention will be described in further detail with reference to the drawings and the detailed description, which are provided for reference and illustration purposes only and are not intended to limit the invention.

Fig. 1 is a front view of the gating system of the complex casting of the present invention.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a cross-sectional view taken along a-a in fig. 2.

Fig. 4 is a perspective view of fig. 1.

In the figure: 1. a pouring cup; 2. a sprue; 3a, a front cross gate; 3b, a rear cross gate; 3c, a filtering tank; 3d, collecting slag risers; 4. a casting cavity; 4a, an upper thick part; 4b, a middle thin-wall part; 4c, a lower thick major part; 5. a riser; 6. riser heat insulation cotton; 7. thin-wall part heat insulation cotton; 8. a chill housing; high temperature paraffin wax.

Detailed Description

As shown in fig. 1 to 4, the pouring system for complex castings of the present invention includes a pouring cup 1, a sprue 2, a runner and a casting cavity 4, wherein the casting cavity 4 includes an upper thick major part 4a, a middle thin wall part 4b and a lower thick major part 4c which are sequentially communicated from top to bottom, the bottom of the pouring cup 1 is connected with the sprue 2 which vertically extends downwards, the bottom of the sprue 2 is communicated with a joint part of a front runner 3a and a rear runner 3b, the front runner 3a and the rear runner 3b are in axial symmetry distribution, the front runner 3a extends forwards and rightwards and is connected with the front side of the lower thick major part 4c, the rear runner 3b extends backwards and rightwards and is connected with the rear side of the lower thick major part 4c, the top of the upper thick major part 4a is connected with a riser 5, and riser insulation cotton 6 wraps the periphery of the riser 5; the periphery of the middle thin-wall part 4b is provided with thin-wall heat-insulating cotton 7, the outer side and the bottom of the lower thick-wall part 4c are both provided with a chiller shell 8, and the inner cavity of the chiller shell 8 is provided with high-temperature paraffin 8a.

Molten metal enters from the pouring cup 1, flows downwards to the cross gate along the sprue 2, flows to the front side and the rear side of the lower part of the casting cavity 4 along the front cross gate 3a and the rear cross gate 3b respectively, is filled with the lower thick large part 4c, the middle thin wall part 4b and the upper thick large part 4a in sequence, and finally is ejected from the riser 5, and the top of the riser 5 is flush with the top of the pouring cup 1. A riser 5 is arranged above the upper thick part 4a, and riser heat-insulating cotton 6 is wrapped on the periphery of the riser 5, so that the cooling time of the riser 5 can be effectively prolonged, the feeding capacity of the riser 5 is increased, the use of risers with larger sizes is avoided, and the waste of molten metal is reduced; secondly, the lower thick large part 4c is far away from the riser 5, and the thin-wall heat-insulating cotton 7 is arranged at the thinner part of the middle part to slow down the cooling of the part and realize feeding of the lower thick large part 4 c; in addition, the outer side and the bottom of the lower thick large part 4c are both provided with a chiller shell 8, the chiller shell 8 is usually made of aluminum, the heat conducting performance is good, and the cooling of the lower thick large part 4c can be accelerated; the high-temperature paraffin 8a in the chiller shell 8 is heated and melted to absorb a large amount of heat, so that the chilling effect of the chiller can be further enhanced. The pouring system adopts different feeding structures for different thick parts, is convenient to use and low in cost, and can improve the qualification rate of castings.

The bottom of the joint of the front cross gate 3a and the rear cross gate 3b is provided with a filter tank 3c which is concave downwards. The filter screen in the filter tank 3c can intercept scum in the metal liquid, so that the scum is prevented from entering the cavity, and the quality of the casting is improved; the bottom of the filter tank 3c is concave downwards to buffer descending molten metal.

And the blind ends of the right ends of the front cross gate 3a and the rear cross gate 3b are respectively provided with a slag collecting riser 3d which extends upwards. The filtered molten metal still has a small amount of scum sometimes, and the scum flows to the blind ends of the right ends of the front cross runner 3a and the rear cross runner 3b and then upwards enters the slag collecting dead head 3d for storage, so that the scum is prevented from entering the cavity, and the quality of the casting is improved.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention.

Claims

1. The utility model provides a gating system of complicated foundry goods, includes pouring basin and foundry goods die cavity, the foundry goods die cavity includes top-down thick major part, well thin wall portion and the thick major part down that link up in proper order, its characterized in that: the bottom of the sprue cup is connected with a vertical and downward extending sprue, the bottom of the sprue is communicated with a joint of a front transverse sprue and a rear transverse sprue, the front transverse sprue and the rear transverse sprue are in axial symmetry distribution, the front transverse sprue extends forwards and rightwards and is connected with the front side of the lower thick large part, the rear transverse sprue extends backwards and rightwards and is connected with the rear side of the lower thick large part, the top of the upper thick large part is connected with a riser, and riser heat-insulating cotton is wrapped on the periphery of the riser; the periphery of the middle thin-wall part is provided with thin-wall part heat-insulation cotton, the outer side and the bottom of the lower thick part are both provided with a chiller shell, and the inner cavity of the chiller shell is provided with high-temperature paraffin.

2. The gating system for complex castings according to claim 1, wherein: the bottom of the joint part of the front and the rear cross runners is provided with a filter tank which is concave downwards.

3. The gating system for complex castings according to claim 1 or 2, characterized in that: and the blind ends of the right ends of the front cross pouring channel and the rear cross pouring channel are respectively provided with a slag collecting riser extending upwards.