Bottom turning type pouring system for large bowl-shaped steel casting

Abstract

The utility model belongs to the technical field of casting and pouring systems, and particularly discloses a bottom turning type pouring system for a large bowl-shaped steel casting, which comprises a vertical pouring gate, a transverse pouring gate, an outer ring pouring gate, an inner ring pouring gate, a casting cavity and a riser group, the lower end of the vertical pouring gate is communicated with one end of the transverse pouring gate, the other end of the transverse pouring gate is communicated with the inner ring pouring gate, and the riser group is communicated with the outer ring pouring gate. An outer ring pouring gate is arranged above the middle part of the transverse pouring gate, and the transverse pouring gate is communicated with the outer ring pouring gate through a connecting channel; a plurality of sprues are arranged on the upper end surfaces of the outer ring pouring gate and the inner ring pouring gate and are communicated with the lower end surface of the casting cavity; a riser group is arranged on the upper end surface of the casting cavity; according to the pouring system, pouring is conducted in the mode that the multiple sprues are adopted below the casting, in the cooling process of the casting, the sprues are cooled earlier than the casting, and therefore shrinkage porosity and cracks are not prone to being generated in the cooling process of the casting, the quality of the casting is improved, and the follow-up workload is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to foundry pouring system technical field, concretely relates to a bottom overturning type pouring system for large bowl-shaped cast steel parts. BACKGROUND

[0002] Large cast steel parts are often poured by bottom overturning type pouring system in the process of pouring, and the common bottom overturning type pouring system is composed of vertical sprue, horizontal sprue and straight sprue, and when using, one or two larger straight sprues are usually arranged above the horizontal sprue to pour the castings, and when the thickness of the castings is larger than the straight sprue, the straight sprue cools first, and the castings cool later, and the castings continuously receive the molten steel supplement from the riser during the cooling process, which does not affect the castings.

[0003] When the thickness of the castings is thin, for example, when processing large bowl-shaped castings, if the prior art is used, the castings will cool first during the cooling process because the straight sprue is too large and the thickness of the castings is thin, and the straight sprue does not have molten steel supplement during the cooling process, and under the action of thermal expansion and cold shrinkage, the straight sprue will generate a pulling force on the castings, which will cause the castings to be loose, and even cracks will be generated, thereby increasing the subsequent workload or causing the castings to be scrapped. CONTENT OF THE UTILITY MODEL

[0004] In view of the problems in the background art, the utility model provides a bottom overturning type pouring system for large bowl-shaped cast steel parts.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a bottom overturning type pouring system for large bowl-shaped cast steel parts, comprising a vertical sprue, a horizontal sprue, an outer ring sprue, an inner ring sprue, a cast part cavity and a riser group, the lower end of the vertical sprue is connected with one end of the horizontal sprue, the other end of the horizontal sprue is connected with the inner ring sprue, the upper part of the middle part of the horizontal sprue is provided with the outer ring sprue, and the horizontal sprue and the outer ring sprue are connected through a connecting channel; a plurality of straight sprues are arranged on the upper end faces of the outer ring sprue and the inner ring sprue, and the straight sprues are connected with the lower end face of the cast part cavity; and the upper end face of the cast part cavity is provided with the riser group.

[0006] The cast part cavity is in a bowl-shaped structure, the bottom surface of the cast part cavity is a circular plate, and the sidewall of the cast part cavity is an upwardly inclined circular ring; the inner ring sprue is located below the bottom surface of the cast part cavity, and the inner ring sprue is connected with the cast part cavity through the straight sprues; and the outer ring sprue is located below the sidewall of the cast part cavity, and the outer ring sprue is connected with the cast part cavity through the straight sprues.

[0007] The diameters of the outer ring sprue and the inner ring sprue are a, and the diameter of the straight sprue is b, and a:b=3:2.

[0008] The riser group is composed of a plurality of risers.

[0009] The diameter of the sprue is less than the thickness of the casting cavity.

[0010] The utility model discloses a bottom overturning type pouring system for large bowl-shaped cast steel parts, which adopts the mode of multiple sprues to pour at the lower part of the casting, and the sprues cool down before the casting during the cooling process of the casting, so that the casting is not prone to shrinkage and cracks during the cooling process, the quality of the casting is improved, and the subsequent workload is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1 It is a bottom view of the utility model.

[0012] Fig. 2 It is an A-A sectional view.

[0013] Fig. 3 It is a pouring system schematic view of the utility model.

[0014] In the figure: 1, vertical sprue, 2, horizontal sprue, 3, outer ring sprue, 4, inner ring sprue, 5, straight sprue, 6, casting cavity, 7, riser group, 8, connecting channel. DETAILED DESCRIPTION

[0015] The technical solutions of the utility model will be described clearly and completely in combination with the drawings of the description, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments; based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the protection scope of the utility model.

[0016] The following will be combined with the drawings of the description Figs. 1-3Further detailed description of the specific embodiments of the utility model is made: a kind of bottom overturning type pouring system for large bowl-shaped cast steel parts, including sprue 1, runner 2, outer ring gate 3, inner ring gate 4, casting cavity 6 and riser group 7, the upper end of sprue 1 is connected with gate seat, the lower end of sprue 1 is connected with one end of runner 2, the other end of runner 2 is connected with inner ring gate 4, the upper of middle part of runner 2 is equipped with outer ring gate 3, and runner 2 and outer ring gate 3 are connected by connecting channel 8;Multiple straight gates 5 are equipped on the upper end surface of outer ring gate 3 and inner ring gate 4, and straight gate 5 is connected with the lower end surface of casting cavity 6;The casting cavity 6 is bowl-shaped structure, the bottom surface of casting cavity 6 is circular plate, and the sidewall of casting cavity 6 is upwardly inclined circular ring;The inner ring gate 4 is located below the bottom surface of casting cavity 6, and the inner ring gate 4 is connected with the casting cavity 6 by straight gate 5;The outer ring gate 3 is located below the sidewall of casting cavity 6, and the outer ring gate 3 is connected with the casting cavity 6 by straight gate 5;In the specific implementation process, inner ring gate 4 is generally arranged at the bottom surface edge of casting cavity 6, and outer ring gate 3 is generally arranged below the middle part of the sidewall of casting cavity 6;The diameter of straight gate 5 is less than the thickness of casting cavity 6;The diameter of outer ring gate 3 and inner ring gate 4 is a, and the diameter of straight gate 5 is b, a:b=3:2;In actual use process, in order to ensure that straight gate 5 cools first, the diameter of straight gate 5 is generally half of the thickness of casting, in order to improve the quality of casting, the diameter of outer ring gate 3 and inner ring gate 4 is greater than the diameter of straight gate 5, and in the cooling process of straight gate 5, outer ring gate 3 and inner ring gate 4 can provide certain molten steel for straight gate 5 to perform feeding;Riser group 7 is composed of multiple risers.

[0017] The utility model uses the following process: first, the method of using sand mold casting mold is made out of this pouring system;After the completion of mold making, pouring can be started;When pouring, molten steel enters from the gate seat at the upper end of sprue 1, enters runner 2 after passing through sprue 1, enters inner ring gate 4 from runner 2, and enters casting cavity 6 through straight gate 5 at the upper end of inner ring gate 4 to perform filling, and the molten steel rises from bottom to top in casting cavity 6;When the height of molten steel reaches the upper side of outer ring gate 3, part of the molten steel enters outer ring gate 3 through connecting channel 8, and then enters casting cavity 6 through straight gate 5 at the upper end of outer ring gate 3 to perform filling;After filling is completed, the casting slowly cools down;In the cooling process, because the diameter of straight gate 5 is less than the thickness of casting cavity 6, straight gate 5 cools down first, thereby ensuring that the casting is not prone to produce loose and cracks in the cooling process, and improving the quality of casting.

[0018] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0019] The part not described in detail in the present application is prior art.

Claims

1. A bottom pour gating system for large bowl-shaped cast steel parts, comprising a vertical gate (1), a cross gate (2), an outer ring gate (3), an inner ring gate (4), a part cavity (6) and a riser group (7), characterized in that: The lower end of the sprue (1) is communicated with one end of the runner (2), the other end of the runner (2) is communicated with the inner ring gate (4), the upper part of the middle part of the runner (2) is provided with the outer ring gate (3), the runner (2) and the outer ring gate (3) are communicated through the connecting channel (8); the upper end surface of the outer ring gate (3) and the inner ring gate (4) is provided with a plurality of straight gates (5), the straight gate (5) is communicated with the lower end surface of the casting cavity (6); the upper end surface of the casting cavity (6) is provided with the riser group (7).

2. A bottom pour system for large bowl-shaped steel castings as defined in claim 1 wherein: The casting cavity (6) is a bowl-shaped structure, the bottom surface of the casting cavity (6) is a circular plate, and the side wall of the casting cavity (6) is an upwardly inclined circular ring; the inner ring gate (4) is located below the bottom surface of the casting cavity (6), and the inner ring gate (4) is communicated with the casting cavity (6) through the straight gate (5); the outer ring gate (3) is located below the side wall of the casting cavity (6), and the outer ring gate (3) is communicated with the casting cavity (6) through the straight gate (5).

3. A bottom pour system for large bowl-shaped steel castings as defined in claim 1 wherein: The diameter of the outer ring gate (3) and the inner ring gate (4) is a, the diameter of the straight gate (5) is b, and a:b=3:

2.

4. A bottom pour system for large bowl-shaped steel castings as defined in claim 1 wherein: The riser group (7) is composed of a plurality of risers.

5. A bottom pour system for large bowl-shaped steel castings as defined in claim 1 wherein: The diameter of the straight gate (5) is smaller than the thickness of the casting cavity (6).

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