CN218926164U - Pouring system for casting steel castings by using damp mould sand - Google Patents

Abstract

The utility model belongs to the technical field of casting, and particularly relates to a pouring system for casting steel castings by using damp sand, which comprises a straight pouring gate, a first transverse pouring gate, a second transverse pouring gate, a plurality of first inner pouring gates, a plurality of second inner pouring gates and a plurality of filters, wherein the first transverse pouring gates and the second transverse pouring gates are axially connected; the sprue is vertically communicated with the connecting part of the first cross runner and the second cross runner, and a sprue nest seat is arranged on the opposite surface of the mounting position of the sprue; one ends of the first ingate and the second ingate are respectively arranged on the first runner and the second ingate, and the other ends of the first ingate and the second ingate are communicated with the steel casting cavity; the channels of the straight pouring gate, the first transverse pouring gate, the second transverse pouring gate, the plurality of first inner pouring gates and the plurality of second inner pouring gates are all cylindrical structures. The utility model not only can lighten the weight of a pouring system, but also can reduce casting defects such as cold shut, peeling, air holes, slag inclusion and the like of castings.

Description

Pouring system for casting steel castings by using damp mould sand

Technical Field

The utility model belongs to the technical field of casting, and particularly relates to a pouring system for casting steel castings by using damp mould sand.

Background

The cast steel has the characteristics of high melting point, poor fluidity, large shrinkage and easy oxidation. The conventional design of the pouring system mostly adopts rectangular or trapezoidal sections, when molten steel flows in the pouring system, because of the characteristics of the pouring system of the rectangular and trapezoidal sections, the sharp corner part of the pouring system forms flow resistance, so that the flow of the molten steel with poor fluidity is blocked, the flow rate is uneven, the casting molding is affected, and the defects of cold insulation, peeling, air holes and slag inclusion are easily generated. For the wet sand with a large water content, the sand layer is thick and has poor air exhaust property. These casting defects are more likely to occur. Therefore, the design of the casting system capable of effectively improving the yield and reducing casting defects such as cold shut, skinning, air holes, slag inclusion and the like of castings is important.

Disclosure of Invention

In order to solve the technical problems, the utility model provides the pouring system which not only can reduce the weight of the pouring system, but also can reduce casting defects of cold shut, skinning, air holes and slag inclusion of castings.

The utility model discloses a pouring system for casting steel castings by using damp sand, which comprises a straight pouring gate, a first transverse pouring gate, a second transverse pouring gate, a plurality of first inner pouring gates, a plurality of second inner pouring gates and a plurality of filters, wherein the first transverse pouring gate and the second transverse pouring gate are axially connected; the sprue is vertically communicated with the connecting part of the first cross runner and the second cross runner, and a sprue nest seat is arranged on the opposite surface of the mounting position of the sprue; the first ingate and the second ingate are respectively arranged on the first ingate and the second ingate, the first ingate and the second ingate are respectively communicated with the steel casting cavity, and the filters are respectively arranged on the first ingate and the second ingate in one-to-one correspondence.

Further, the channels of the sprue, the first runner, the second runner, the plurality of first ingates and the plurality of second ingates are all cylindrical structures.

Further, the pouring system is an open pouring system, and the ratio of the channel sectional areas of the pouring system is that: and (3) a cross gate: ingate = 1:1.1: (1.2-1.3); the cross runners comprise a first cross runner and a second cross runner, and the inner runners comprise a plurality of first inner runners and a plurality of second inner runners.

Further, the sprue nest seat is 5-10 mm higher than the first cross runner and the second cross runner.

The beneficial effects of the utility model are as follows:

the bottom end of the sprue channel is provided with the sprue vortex seat, so that the sprue vortex seat has a buffering effect, a highly turbulent flow area at the turning part of the sprue and the cross runner is shortened, and a certain amount of gas is always contained in the injected initial molten metal, so that the sprue vortex seat can float out, and casting defects such as air holes are avoided;

the pouring system is provided with a plurality of holes, so that the production efficiency is improved, and the first inner runner and the second inner runner are symmetrically distributed on the first transverse runner and the second transverse runner, so that the steel casting cavity can be simultaneously and evenly filled;

the inner pouring channels are all provided with filters, so that casting solution is guaranteed to be filtered, and filter residues are filtered;

the open type pouring system is used, the sectional area ratio of the pouring system is designed to be within a constant value range, and the yield is improved;

the utility model designs the pouring system with the circular section, and the flow resistance is not generated when the molten steel flows in the system due to the pouring system with the circular section, so that the flow rate of the molten steel in each pouring channel is uniform, smooth and rapid, the filling efficiency of the molten steel is accelerated, the proportional relation of each section of the pouring system is reduced, the weight of the pouring system is lightened, and the casting defects of cold insulation, skinning, air holes and slag inclusion of castings can be reduced.

Drawings

Fig. 1 is a schematic view of the overall structure of the present utility model.

Reference numerals: 1: sprue, 2: first runner, 3: second runner, 4: first ingate, 5: second ingate, 6: filter, 7: and a sprue nest seat.

Detailed Description

In order to further describe the technical means and effects adopted by the present utility model for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present utility model with reference to the accompanying drawings and preferred embodiments.

It is to be noted that the terms "first," "second," and the like in the description and the claims of this application are used for distinguishing between similar objects and not for describing a particular sequential or chronological order, and it is to be understood that the terms so used may be interchanged where appropriate.

It should be noted that, in the present application, unless otherwise stated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the direction shown in the drawings, or with respect to the component itself in the vertical, vertical or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present utility model.

Examples

As shown in fig. 1, a pouring system for a green sand cast steel casting comprises a sprue 1 with a diameter of 54mm, a first runner 2 with a diameter of 40mm, a second runner 3 with a diameter of 40mm, four first ingates 4 with a diameter of 22mm, four second ingates 5 with a diameter of 22mm and eight filters 6. The size of the filter 6 is 60mm 22mm, and the material is silicon carbide or zirconia. It should be noted that the channels of the sprue 1, the first runner 2, the second runner 3, the four first ingate 4 and the four second ingate 5 are all cylindrical structures, and the cross section of the channels is circular, so that the flow resistance of molten steel in the system is avoided, the flow rate of the molten steel in each runner is uniform, smooth and rapid, and the mold filling efficiency of the molten steel is accelerated.

The first cross runner 2 and the second cross runner 3 are axially connected, the sprue 1 is vertically communicated with the connecting part of the first cross runner 2 and the second cross runner 3, and a sprue nest seat 7 is installed at the opposite position of the installation position of the sprue 1. The sprue nest seat 7 is higher than the first runner 2 and the second runner 3 5-10 mm, so that the molten metal can be buffered conveniently, and bubbles in the molten metal can be discharged.

The pouring system is a mould eight-hole, four first ingate 4 and four second ingate 5 are respectively arranged on the first ingate 2 and the second ingate 3, the four first ingate 4 and the four second ingate 5 respectively form an X-shaped central symmetrical structure, and the other ends of the four first ingate 4 and the four second ingate 5 are communicated with the casting cavity, so that the production efficiency is improved, and the casting cavity can be simultaneously and evenly filled. Eight filters 6 are respectively arranged on the four first ingate 4 and the four second ingate 5 in a one-to-one correspondence manner to block inclusion.

The pouring system is an open pouring system, and the channel cross-sectional area ratio of the pouring system is that of a sprue 1: and (3) a cross gate: ingate = 1:1.1: (1.2-1.3); the cross runners comprise a first cross runner 2 and a second cross runner 3, and the inner runners comprise four first inner runners 4 and four second inner runners 5. And the casting with complete casting and high qualification rate is obtained by controlling the total sectional areas of the sprue 1, the cross gate and the inner gate and controlling the casting time and the casting speed.

The utility model relates to a pouring system for casting steel castings by using damp mould sand, which comprises the following steps:

guiding molten metal downwards through a pouring cup and introducing the molten metal from the sprue 1; the molten metal entering the straight pouring channel 1 reaches the straight pouring channel nest seat 7 at the bottom end of the channel in the straight pouring channel 1, and the gas in the molten metal is buffered and filtered, so that the flow distribution of the inner pouring channel is improved; then smoothly enter a first cross runner 2 and a second cross runner 3, four inner runners are respectively arranged on the first cross runner 2 and the second cross runner 3, molten metal is infused into a casting mold cavity through the inner runners, a casting system is one mold eight holes, the production efficiency is improved, and the first inner runner 4 and the second inner runner 5 are symmetrically distributed, so that the casting mold cavity can be simultaneously and evenly filled; a filter 6 is arranged on the ingate to prevent the impurities from entering the die cavity.

The present utility model is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present utility model.

Claims (4)

1. A gating system for damp mould sand casting cast steel piece, includes sprue, first cross runner, second cross runner, a plurality of first ingate, a plurality of second ingate, a plurality of filter, its characterized in that: the first cross runner and the second cross runner are axially connected; the sprue is vertically communicated with the connecting part of the first cross runner and the second cross runner, and a sprue nest seat is arranged on the opposite surface of the mounting position of the sprue; the first ingate and the second ingate are respectively arranged on the first ingate and the second ingate, the first ingate and the second ingate are respectively communicated with the steel casting cavity, and the filters are respectively arranged on the first ingate and the second ingate in one-to-one correspondence.

2. A casting system for a green sand cast steel product according to claim 1 wherein the passages of the sprue, the first runner, the second runner, the plurality of first ingates, and the plurality of second ingates are all cylindrical structures.

3. A gating system for sand casting of steel castings according to claim 2, wherein said gating system is an open gating system having a channel cross sectional area ratio of: and (3) a cross gate: ingate = 1:1.1: (1.2-1.3); the cross runners comprise a first cross runner and a second cross runner, and the inner runners comprise a plurality of first inner runners and a plurality of second inner runners.

4. A casting system for green sand cast steel according to claim 3 wherein said sprue nest is 5-10 mm above said first runner and said second runner.

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