Double-layer pouring system for bottom turning type large steel casting

Abstract

The utility model belongs to the technical field of casting and pouring systems, and particularly discloses a double-layer pouring system for a bottom turning type large steel casting, which comprises a vertical pouring gate, a lower ring pouring gate, an upper ring pouring gate, a casting cavity and risers, and the risers are uniformly distributed on the upper end face of the casting cavity; the vertical pouring gate is communicated with the lower transverse pouring gate, the lower transverse pouring gate is communicated with the lower annular pouring gate, a plurality of lower straight pouring gates are arranged on the upper end face of the lower annular pouring gate, and the lower straight pouring gates are communicated with the lower end face of the casting cavity; the middle part of the vertical pouring gate is communicated with one end of the upper transverse pouring gate, the other end of the upper transverse pouring gate is communicated with the upper ring pouring gate, the upper ring pouring gate surrounds the outer side of the riser, and the upper ring pouring gate is communicated with the riser through the upper straight pouring gate; the pouring system adopts a double-layer pouring system, and when molten steel enters a riser, the molten steel flows into the riser from an upper straight pouring gate at the upper end; therefore, unsmooth mold filling caused by reduction of the flow speed of the molten steel can be effectively prevented, and the phenomena of shrinkage porosity, cracks and the like in a casting are avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to casting pouring system technical field, concretely relates to a double -deck pouring system for bottom -up large -scale cast steel piece. BACKGROUND

[0002] Large -scale cast steel piece is in the process of pouring, often uses bottom -up pouring system to pour, the commonly used bottom -up pouring system is by vertical gate, cross gate and straight gate is formed, when using, generally set up one or two larger straight gate in the upper side of cross gate, pour the casting, when the thickness of casting is greater than straight gate, straight gate cools first, casting cools later, casting is continuously received in the riser during the cooling process The molten steel supplement shrinkage does not affect the casting.

[0003] When bottom -up pouring system pours large -scale castings, due to the volume of the casting is too large, the time required for pouring is longer, the molten steel is prone to be too low in the later stage of pouring, due to the small diameter of the straight gate, the molten steel is prone to flow, the casting has not been poured, the molten steel in the straight gate cools, causing the molten steel flow rate to decrease, causing the casting to produce shrinkage, and in severe cases, cracks will occur, thereby increasing the subsequent workload, or making the casting scrap. CONTENT OF THE UTILITY MODEL

[0004] In view of the problems in the background art, the utility model provides a double -deck pouring system for bottom -up large -scale cast steel piece.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: a double -deck pouring system for bottom -up large -scale cast steel piece, including vertical gate, lower ring gate, upper ring gate, casting cavity and riser, the upper end face of the casting cavity is uniformly distributed with a plurality of risers, the lower end of the vertical gate is connected with one end of the lower cross gate, the other end of the lower cross gate is connected with the lower ring gate, a plurality of lower straight gates are arranged on the upper end face of the lower ring gate, and the lower straight gates are connected with the lower end face of the casting cavity,

[0006] The middle part of the vertical gate is connected with one end of the upper cross gate, the other end of the upper cross gate is connected with the upper ring gate, the upper ring gate surrounds the outer side of the riser, and the upper ring gate is connected with the riser through the upper straight gate.

[0007] The casting cavity is a ring cylinder, the lower ring gate is located below the bottom surface of the casting cavity, and the lower ring gate is connected with the casting cavity through the lower straight gate.

[0008] The diameter of the lower ring gate is a, the diameter of the lower straight gate is b, and a:b = 3:2.

[0009] The diameter of the upper ring gate is c, the diameter of the upper straight gate is d, and c:d = 3:2.

[0010] The upper sprue is communicated with the middle part of the riser.

[0011] The utility model discloses beneficial effect: the utility model provides a double -deck casting system for bottom -up type large -scale cast steel piece, this casting system adopts double -deck's casting system, when the molten steel enters the riser, and the molten steel flows into the riser from the upper straight sprue of upper end, thereby can effectively prevent the filling of the phenomenon such as shrinkage, crack etc. that the molten steel flow rate reduction causes, avoids the internal generation of castings. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is the plan view of the utility model.

[0013] Fig. 2 It is the bottom view of the utility model.

[0014] In the drawing: 1, vertical sprue, 2, lower cross sprue, 3, lower ring sprue, 4, lower straight sprue, 5, upper cross sprue, 6, upper ring sprue, 7, upper straight sprue, 8, castings cavity, 9, riser. DETAILED DESCRIPTION

[0015] The technical scheme of the utility model will be described clearly and completely below in connection with the drawings of the specification, obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment, based on the embodiment in the utility model, all other embodiments that the person skilled in the art obtains without making the creative labor belong to the range of protection of the utility model.

[0016] The following combines the drawings of the utility model with the description Figs. 1-2Further detailed description of the specific embodiments of the utility model is made: a kind of double-layer pouring system for bottom-up large steel casting, including vertical gate 1, lower ring gate 3, upper ring gate 6, casting cavity 8 and riser 9, the casting cavity 8 is annular cylinder, multiple riser 9 is evenly distributed on the upper end surface of casting cavity 8;The upper end of vertical gate 1 is connected with gate seat, and the lower end of vertical gate 1 is connected with one end of lower cross gate 2, and the other end of lower cross gate 2 is connected with lower ring gate 3, and the lower ring gate 3 is located below the bottom surface of casting cavity 8, and multiple lower straight gates 4 are provided on the upper end surface of lower ring gate 3, and lower straight gate 4 is connected with the lower end surface of casting cavity 8;The diameter of lower ring gate 3 is a, and the diameter of lower straight gate 4 is b, a:b=3:2;During casting pouring, the diameter of lower straight gate 4 is less than the diameter of lower ring gate 3, which can improve the flow rate of molten steel during pouring, and slow down the cooling time of lower straight gate 4;During casting cooling, because the diameter of lower straight gate 4 is less than the diameter of lower ring gate 3, and much smaller than the thickness of casting, lower straight gate 4 cools first at this time, so that the shrinkage can be avoided at the junction of lower straight gate 4 and casting;At the same time, during the cooling process of lower straight gate 4, lower ring gate 3 can provide certain molten steel for lower straight gate 4 to compensate, so as to avoid shrinkage phenomenon;

[0017] The middle part of vertical gate 1 is connected with one end of upper cross gate 5, and the other end of upper cross gate 5 is connected with upper ring gate 6, and upper ring gate 6 surrounds the outside of riser 9, and upper ring gate 6 is connected with the middle part of riser 9 through upper straight gate 7;The diameter of upper ring gate 6 is c, and the diameter of upper straight gate 7 is d, c:d=3:2;In the late stage of casting, the pouring temperature of molten steel is too low, the flow of molten steel is not smooth, and a large amount of molten steel is needed for riser 9 to compensate for the cooling of casting;When molten steel enters riser 9, the flow rate of molten steel decreases, which is easy to cause the flow to be not smooth, at this time, molten steel flows into upper ring gate 6 from upper cross gate 5 at the upper end, and flows into riser 9 through upper straight gate 7;In actual pouring process, in order to avoid molten steel flowing from riser 9 into the dross at the upper end of molten steel and flowing into casting cavity 8, sand eye is formed in the inside of casting, upper straight gate 7 is preferably arranged in the middle part of riser 9.

[0018] The use process of the utility model is as follows: first, the pouring system is made by using the method of sand mold casting mold;After the mold is made, pouring can be started;During pouring, molten steel enters from the gate seat at the upper end of vertical gate 1, enters lower cross gate 2 after passing through vertical gate 1, and then enters lower ring gate 3 from lower cross gate 2, and the molten steel enters casting cavity 8 through lower straight gate 4 at the upper end of lower ring gate 3 to fill the mold;When molten steel rises to the middle part of riser 9, the flow rate of molten steel decreases, and molten steel flows into upper ring gate 6 from upper cross gate 5 at the upper end, and flows into riser 9 through upper straight gate 7, and filling is completed.

[0019] 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.

[0020] The part not described in detail in the present application is prior art.

Claims

1. A double-layer gating system for bottom-turning large cast steel parts, comprising a vertical sprue (1), a lower ring sprue (3), an upper ring sprue (6), a casting cavity (8), and a riser (9), characterized in that: Multiple risers (9) are evenly distributed on the upper surface of the casting cavity (8); the lower end of the vertical gating (1) is connected to one end of the lower horizontal gating (2), the other end of the lower horizontal gating (2) is connected to the lower ring gating (3), and multiple lower straight gatings (4) are provided on the upper surface of the lower ring gating (3), and the lower straight gatings (4) are connected to the lower surface of the casting cavity (8); The middle part of the vertical gating channel (1) is connected to one end of the upper horizontal gating channel (5), and the other end of the upper horizontal gating channel (5) is connected to the upper ring gating channel (6). The upper ring gating channel (6) surrounds the outside of the riser (9), and the upper ring gating channel (6) is connected to the riser (9) through the upper vertical gating channel (7).

2. The double-layer gating system for bottom-turning large cast steel parts according to claim 1, characterized in that: The casting cavity (8) is an annular cylinder; the lower ring gating (3) is located below the bottom surface of the casting cavity (8), and the lower ring gating (3) is connected to the casting cavity (8) through the lower straight gating (4).

3. The double-layer gating system for bottom-turning large cast steel parts according to claim 1, characterized in that: The diameter of the lower ring gating (3) is a, and the diameter of the lower straight gating (4) is b, where a:b = 3:

2.

4. The double-layer gating system for bottom-turning large cast steel parts according to claim 1, characterized in that: The diameter of the upper ring gating (6) is c, and the diameter of the upper straight gating (7) is d, where c:d = 3:

2.

5. The double-layer gating system for bottom-turning large cast steel parts according to claim 1, characterized in that: The upper straight gating system (7) is connected to the middle of the riser (9).

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