CN210146930U

CN210146930U - Riser-free pouring system

Info

Publication number: CN210146930U
Application number: CN201920937801.9U
Authority: CN
Inventors: 董长有
Original assignee: Tianjin Yinhe Ouhua Metal Products Co Ltd
Current assignee: Tianjin Yinhe Ouhua Metal Products Co Ltd
Priority date: 2019-06-20
Filing date: 2019-06-20
Publication date: 2020-03-17
Anticipated expiration: 2029-06-20

Abstract

The utility model belongs to the sand casting field, and relates to a non-riser pouring system, which comprises a sand box, a casting head, a pouring gate and a cavity; the casting head is connected with the cavity through a pouring gate; the casting head comprises a hollow cylindrical upper casting head and a hollow cylindrical lower casting head; the top end of the upper casting head is provided with a sprue gate, and the bottom end of the upper casting head is provided with a transition port; the inner wall of the lower casting head close to the transition port is provided with a circular groove with a certain depth, and a filter screen is clamped in the circular groove. The casting head is formed by butt joint of two semicircular casting head units with the same structure; the abutting surfaces of the two casting head units are bonded together through an adhesive. The utility model can make the gating system always in positive pressure state by arranging the filter screen which can not float, and can effectively avoid the casting defects such as air holes, cold shut, impurity fusion and the like; the weight of a pouring system can be effectively reduced, the using amount of liquid metal is reduced, the material yield is improved, and the cost is saved.

Description

Riser-free pouring system

Technical Field

The utility model relates to a sand casting field, concretely relates to no rising head gating system.

Background

Sand casting is a casting process that produces castings in sand molds. Steel, iron and most nonferrous metal castings can be obtained by sand casting. The molding material used for sand casting is cheap and easy to obtain, the casting mould is simple and convenient to manufacture, and the casting mould can adapt to single-piece production, batch production and mass production of castings, and is a basic process in casting production for a long time.

The gating system for sand casting generally comprises: the sprue cup, the sprue, the cross gate, the riser cup and the inner gate; one end of the sprue is connected with the sprue cup, and the other end of the sprue is connected with the cross gate; the bottom end of the horizontal pouring gate is connected with the inner pouring gate, and the riser cup is arranged at the tail end of the horizontal pouring gate. The pouring cup is used for guiding liquid metal poured by a pouring ladle into the sprue; the riser cup refers to a supplementary part which is added above or on the side of the casting to avoid the defect of the casting; the cavity of the riser cup is a cavity for storing liquid metal, and metal is supplied when a casting is formed, so that the riser cup has the functions of preventing shrinkage cavity, shrinkage porosity, exhaust and slag collection. However, this type of gating system occupies a large area in the sandbox and the amount of liquid metal poured is also large due to the flow of liquid metal from the tundish to the ingate.

In order to solve the problem, a casting head combining a sprue cup and a riser cup is provided at present, the casting head comprises an upper riser and a lower riser which are integrally connected and formed, a filter block is arranged in the lower riser, casting liquid is poured through the upper riser, and the filter block floats to the upper end surface of the upper riser after pouring is finished. However, the casting head of this type has problems: in the pouring process, after the filter screen is blocked by impurities to a certain degree, molten iron can form a molten pool on the upper part of the filter screen, the filter screen can float and shift, and the impurities enter a casting due to the loss of the filtering function; in order to prevent the situations, the molten iron cannot be quickly filled in the cavity during pouring, but the defects of cold shut and the like are easily caused.

SUMMERY OF THE UTILITY MODEL

The utility model provides a non-riser pouring system aiming at the technical problems in the prior art; the pouring system combines the functions of the pouring cup and the pouring cup into a whole, shortens the length of a pouring gate, saves liquid metal, can filter impurities in the metals, cannot cause the defects of cold shut and the like, and ensures the quality of castings.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a non-riser pouring system comprises a sand box, a casting head, a pouring gate and a cavity; the casting head is connected with the cavity through a pouring gate; the casting head comprises a hollow cylindrical upper casting head and a hollow cylindrical lower casting head; the top end of the upper casting head is provided with a sprue gate, and the bottom end of the upper casting head is provided with a transition port; the inner wall of the lower casting head close to the transition port is provided with a circular groove with a certain depth, and a filter screen is clamped in the circular groove.

Further, the size of the casting head is as follows: the inner diameter of the upper casting head is 80 mm; the inner diameter of the lower casting head is 60 mm; the height of the casting head is 100 mm.

Furthermore, the casting head is formed by butt joint of two semicircular casting head units with the same structure; the abutting surfaces of the two casting head units are bonded together through an adhesive.

Furthermore, lugs extend outwards from two radial sides of each casting head unit; one side of the lug is flush with the butt joint surface of the casting head.

The utility model has the advantages and positive effects that:

the non-riser pouring system has simple and reasonable structure and low manufacturing and maintenance cost, and can ensure that the pouring system is always in a positive pressure state by arranging the filter screen which cannot float, thereby effectively avoiding the casting defects of air holes, cold shut, impurity fusion and the like; meanwhile, the casting head is small in size, so that the length of a pouring gate of a pouring system is shortened, the weight of the pouring system can be effectively reduced, the using amount of liquid metal is reduced, the material yield is improved, and the cost is saved.

Description of the drawings:

FIG. 1 is a schematic view of a gating system in a preferred embodiment of the present invention;

FIG. 2 is a top view of a casting head in a preferred embodiment of the invention;

fig. 3 is a front view of the feeder head unit in the preferred embodiment of the invention.

Wherein: 1. a sand box; 2. casting a dead head; 21. casting heads upwards; 211. a sprue; 212. a transition port; 22. lower casting heads; 221. a circular groove; 222. a filter screen; 23. a lug; 3. a pouring channel; 4. a mold cavity.

Detailed Description

For further understanding of the contents, features and functions of the present invention, the following embodiments will be exemplified in conjunction with the accompanying drawings as follows:

as shown in fig. 1 to 3, the utility model discloses a non-riser gating system, which comprises a sand box 1, a casting head 2, a pouring gate 3 and a cavity 4; the casting head 2 in the pouring system only needs to be directly connected with the cavity 4 through the pouring gate 3 because the traditional pouring gate and the traditional casting head are combined into a whole, so that the length of the pouring gate in the traditional pouring system is saved, and the weight of the pouring system is reduced by 30%; in addition, the liquid metal for pouring is greatly saved.

The casting head 2 comprises an upper casting head 21 and a lower casting head 22 which are hollow cylindrical; the top end of the upper casting head 21 is provided with a sprue 211, and the bottom end of the upper casting head is provided with a transition port 212; liquid metal enters the upper casting head 21 from the sprue 211 and enters the lower casting head 22 below through the transition port 212; preferably, the straight wall and the bottom of the upper casting head 21 are connected by a smooth arc, so as to prevent the accumulation of liquid metal at the bottom; the inner wall of the lower casting head 22 close to the transition port 212 is provided with a circular groove 221 with a certain depth, and a filter screen 222 is clamped in the circular groove 221; because the position of the filter screen 222 is fixed, an effective molten pool can be formed above the filter screen 222 so that impurities can float, the filter screen 222 is prevented from being blocked to the maximum extent, the pouring pressure is increased, and mold filling is facilitated;

the riser in the prior art belongs to a cold riser, and the diameter of the riser is generally larger in order to ensure the temperature of the riser because liquid metal only flows at the bottom of the riser; the casting head 2 in the utility model has the advantages that the liquid metal in the casting head 2 is not easy to cool due to the fact that the liquid metal is directly cast from top to bottom, so that the inner diameter of the casting head 2 can be reduced, heat preservation can be realized, and the liquid metal can be saved; specifically, the size of the casting head 2 is as follows: the inner diameter of the upper casting head is 80 mm; the inner diameter of the lower casting head is 60 mm; the height of the casting head is 100 mm.

Preferably, in order to facilitate installation of the filter screen 222, the casting head 2 is formed by butt joint of two semicircular casting head 2 units with the same structure; the butt joint surfaces of the two casting head 2 units are bonded together through an adhesive;

preferably, in order to enhance the connection strength and facilitate taking and placing the casting head 2, lugs 23 extend outwards from two radial sides of each casting head 2 unit; one side of the lug 23 is flush with the abutment surface of the casting head 2 to increase the bonding area.

The embodiments of the present invention have been described in detail, but the above description is only for the preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. The utility model provides a no rising head gating system which characterized in that: comprises a sand box, a casting head, a pouring gate and a cavity; the casting head is connected with the cavity through a pouring gate; the casting head comprises a hollow cylindrical upper casting head and a hollow cylindrical lower casting head; the top end of the upper casting head is provided with a sprue gate, and the bottom end of the upper casting head is provided with a transition port; the inner wall of the lower casting head close to the transition port is provided with a circular groove with a certain depth, and a filter screen is clamped in the circular groove.

2. The feeder-less gating system of claim 1, wherein: the size of the casting head is as follows: the inner diameter of the upper casting head is 80 mm; the inner diameter of the lower casting head is 60 mm; the height of the casting head is 100 mm.

3. The feeder-less gating system of claim 1, wherein: the casting head is formed by butt joint of two semicircular casting head units with the same structure; the abutting surfaces of the two casting head units are bonded together through an adhesive.

4. The feeder-less gating system of claim 3, wherein: lugs extend outwards from two radial sides of each casting head unit; one side of the lug is flush with the butt joint surface of the casting head.