Pouring system of shunting casing

Abstract

The utility model provides a pouring system of a shunting casing, which is used for pouring a shunting casing shell, a casting cavity of the shunting casing shell is provided with three annular cavity walls, a straight pouring gate is arranged below the casting cavity, a transverse pouring gate is arranged on the straight pouring gate, and the transverse pouring gate is connected with the shunting casing shell. The cross gate comprises a first cross gate located on the inner side, a second cross gate located on the middle side and a third cross gate located on the outer side, the first cross gate is arranged corresponding to the three cavity walls, the first cross gate is communicated with the casting cavity through a first flow gate, and the second cross gate is communicated with the casting cavity through a second flow gate; the third cross gate is communicated with the casting cavity through a third inner gate, the cross gates are arranged on the annular cavity wall corresponding to the casting cavity, and the vertical straight gate is arranged to fully feed all parts of the casting cavity, so that the defects of shrinkage cavities, looseness, hot cracks and the like which are easily generated due to over-wide crystallization temperature of magnesium alloy are well overcome, and the internal quality of a casting is improved; and one-time casting molding of a casting is ensured.

Description

Technical Field

[0001] The utility model relates to a casting pouring system, in particular to a pouring system for a diverter casing. Background Art

[0002] The splitter case is an important component of an aircraft engine. Its shape has the function of air intake and gas filtering, and it bears the force and torque generated by the propeller. The material is cast magnesium alloy. Magnesium alloy has a wide crystallization range and is easily oxidized during the filling process, so the casting is prone to defects such as shrinkage, looseness, and thermal cracking.

[0003] The casting cavity of the diverter casing in the utility model is composed of three circular rings, which are connected by six symmetrical internal hollow spindle ribs, and a thin-walled rectangular parallelepiped is connected to the outside of the outermost circular cavity. The utility model is characterized by thin walls, complexity, large size, and the presence of many isolated heat nodes. If it is traditional gravity casting or low-pressure casting, the casting qualification rate and process yield rate are very low. For example, the process yield rate of gravity casting is about 15-20%, and defects such as shrinkage cavities, looseness, thermal cracking, and oxidation slag inclusions are easily generated during the casting process. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the existing casting of the diverter casing has defects such as shrinkage cavity, looseness, thermal cracking, oxidation slag inclusion, etc. The utility model provides a pouring system for the diverter casing to solve the above problems.

[0005] The utility model solves the technical problem by adopting the following technical solution: a pouring system for a diverter casing, which is used for pouring a diverter casing shell, wherein the casting cavity of the diverter casing shell has three annular cavity walls, a straight runner is arranged below the casting cavity, a cross runner is arranged on the straight runner, the cross runner comprises a first cross runner located on the inner side, a second cross runner located on the middle side and a third cross runner located on the outer side, which are arranged corresponding to the three cavity walls, the first cross runner is connected to the casting cavity through a first inner gate, the second cross runner is connected to the casting cavity through a second inner gate, and the third cross runner is connected to the casting cavity through a third inner gate.

[0006] Furthermore: an inner vertical sprue is vertically arranged on the first horizontal runner, an outer vertical sprue is vertically arranged on the third horizontal runner, the inner vertical sprue is connected to the inner wall of the casting cavity through a slit gate, and the outer vertical sprue is connected to the outer wall of the casting cavity through a slit gate.

[0007] Further: the cross-sectional shape of the first ingates is "convex", the number of the first ingates is nine and they are evenly arranged along the circumference of the cavity wall; the cross-sectional shape of the second ingates is elliptical, the number of the second ingates is twelve and they are evenly arranged along the circumference of the cavity wall; the cross-sectional shape of the third ingates is elliptical, the number of the third ingates is ten and they are arranged along the circumference of the cavity wall.

[0008] Furthermore: a riser is arranged on the top of the casting cavity, and a conformal chill is arranged on the side of the cavity wall.

[0009] The beneficial effect of the utility model is that the pouring system of the diverter casing of the utility model is provided with a horizontal runner through the annular cavity wall corresponding to the casting cavity, and a vertical straight runner is provided to fully compensate for the shrinkage of various parts of the casting cavity, and a heat storage cross channel is adopted to facilitate the metal liquid to form a steady flow, and prevent the entrapment of gas during the filling process, which well solves the defects such as shrinkage cavity, looseness, thermal cracking, etc. that are easily generated due to the excessively wide crystallization temperature of magnesium alloy, improves the internal quality of the casting, and ensures the one-time pouring and molding of the casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0011] Figure 1 It is a structural stereoscopic schematic diagram of a pouring system of a diverter casing of the utility model;

[0012] Figure 2 It is a top view of the pouring system of a split-flow casing;

[0013] Figure 3 yes Figure 1 AA section view in;

[0014] Figure 4 yes Figure 2 BB section view in.

[0015] In the figure, 1, casting cavity, 2, sprue, 3, runner, 4, cavity wall, 5, first ingates, 6, second ingates, 7, third ingates, 8, inner vertical sprue, 9, outer vertical sprue, 10, slit gate, 11, riser, 12, conformal chiller. DETAILED DESCRIPTION

[0016] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. On the contrary, the embodiments of the present invention include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0017] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0018] In addition, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0019] Any process or method description in the flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0020] like Figure 1-4As shown, the utility model provides a casting system for a diverter casing, which is used for casting a diverter casing shell, wherein the casting cavity 1 of the diverter casing shell has three annular cavity walls 4, a straight runner 2 is arranged below the casting cavity 1, a cross runner 3 is arranged on the straight runner 2, the cross runner 3 includes a first cross runner located on the inner side corresponding to the three cavity walls 4, a second cross runner located on the middle side and a third cross runner located on the outer side, the first cross runner is connected to the casting cavity 1 through a first inner gate 5, the second cross runner is connected to the casting cavity 1 through a second inner gate 6, and the third cross runner is connected to the casting cavity 1 through a third inner gate 7.

[0021] An inner vertical sprue 8 is vertically arranged on the first horizontal runner, and an outer vertical sprue 9 is vertically arranged on the third horizontal runner. The inner vertical sprue 8 is connected to the inner wall of the casting cavity 1 through a slit gate 10, and the outer vertical sprue 9 is connected to the outer wall of the casting cavity 1 through a slit gate 10.

[0022] The cross-sectional shape of the first ingates 5 is "convex", the number of the first ingates 5 is nine and they are evenly arranged along the circumference of the cavity wall 4; the cross-sectional shape of the second ingates 6 is elliptical, the number of the second ingates 6 is twelve and they are evenly arranged along the circumference of the cavity wall 4; the cross-sectional shape of the third ingates 7 is elliptical, the number of the third ingates 7 is ten and they are arranged along the circumference of the cavity wall 4.

[0023] Under the action of anti-gravity, the molten metal enters the runner 3 from the sprue 2. Since the runner 3 is large enough, it can store heat well and allow the molten metal to form a steady flow. Heat storage can reduce the cooling of the molten metal, which is beneficial for the molten metal to fill the entire cavity, while the steady flow is beneficial to reduce the secondary oxidation of the molten metal and prevent the entrapment of gas during the filling process. A portion of the molten metal enters the casting cavity 1 from the first entgate 5, the second entgate 6 and the third entgate 7 corresponding to the first cross runner, the second cross runner and the third cross runner respectively, and the first cross runner, the second cross runner and the third cross runner respectively correspond to each annular cavity wall 4 and can be quickly and stably filled, and another portion of the molten metal directly enters the casting cavity 1 from the cross runner 3 through the gap gate 10 of the inner vertical sprue 8 and the outer vertical sprue 9, and sufficient shrinkage compensation is carried out in various parts of the casting cavity 1, especially the outer vertical sprue 9 and the inner vertical sprue 8, which make up for the shrinkage compensation difficulty caused by the cooling of the molten metal or the slowing down of the flow rate at different vertical heights in the casting cavity 1. This layout design completely opens the shrinkage compensation channel and solves the defects of shrinkage holes and looseness that are easy to occur in the casting process.

[0024] A riser 11 is provided at the top of the casting cavity 1, and a conformal chill 12 is provided on the side of the cavity wall 4. The layout design of the conformal chill 12 includes the following aspects:

[0025] 1. At the bottom of the casting cavity 1, a piece of chiller is designed between two adjacent second ingates 6, and a piece of chiller is designed between two adjacent third ingates 7.

[0026] 2. A chill is designed between the risers 11 at the top of the casting cavity 1.

[0027] 3. A full circle of conformal chill 12 is designed on the innermost cavity wall 4 of the casting cavity 1. The chill is designed in three layers, with a thickness of 10 mm and a length of less than 150 mm.

[0028] 4. A full circle of conformal cold iron 12 is designed on the inner side of the cavity wall 4 of the middle layer of the casting cavity 1, with a thickness of 10 mm and a length of less than 150 mm.

[0029] 5. A full circle of conformal chill 12 is designed on the inner side of the outermost cavity wall 4 of the casting cavity 1. The chill is designed in two layers, with a thickness of 10 mm and a length of less than 150 mm.

[0030] 6. An exhaust groove is first designed at the outer rounded corner of the top of the spindle-shaped connecting rib between the middle layer of the casting cavity 1 and the outermost cavity wall 4, and then two conformal chills 12 are designed on each rib.

[0031] 7. Conformal chillers 12 are designed at other hot spots in the casting cavity 1.

[0032] 8. Therefore, the material of the cold iron is HT200.

[0033] When the molten metal fills the casting cavity 1, it flows into the riser 11. This pouring system guarantees the shrinkage compensation effect of the molten metal to the greatest extent. And through the arrangement of the conformal chill 12, the chilling effect of the conformal chill 12 is utilized to adjust the cooling rate of each part of the casting cavity 1, especially the hot spot, which well solves the problem of shrinkage cavity, looseness, thermal cracking and other defects caused by the excessively wide crystallization temperature of magnesium alloy, improves the internal quality of the casting, and ensures the one-time casting molding of the casting.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A casting system for a flow divider casing, used for casting a flow divider casing shell, wherein the casting cavity (1) of the flow divider casing shell has three annular cavity walls (4), characterized in that: A sprue (2) is provided below the casting cavity (1), and a runner (3) is provided on the sprue (2). The runner (3) comprises a first runner located on the inner side, a second runner located on the middle side, and a third runner located on the outer side, which are provided corresponding to the three cavity walls (4). The first runner is connected to the casting cavity (1) via a first ingates (5), the second runner is connected to the casting cavity (1) via a second ingates (6), and the third runner is connected to the casting cavity (1) via a third ingates (7).

2. A pouring system for a split casing as claimed in claim 1, characterized in that: An inner vertical sprue (8) is vertically arranged on the first horizontal runner, and an outer vertical sprue (9) is vertically arranged on the third horizontal runner. The inner vertical sprue (8) is connected to the inner wall of the casting cavity (1) through a slit gate (10), and the outer vertical sprue (9) is connected to the outer wall of the casting cavity (1) through a slit gate (10).

3. A pouring system for a split casing as claimed in claim 2, characterized in that: The cross-sectional shape of the first ingates (5) is a "convex" shape, the number of the first ingates (5) is nine and they are evenly arranged along the circumference of the cavity wall (4); the cross-sectional shape of the second ingates (6) is an ellipse, the number of the second ingates (6) is twelve and they are evenly arranged along the circumference of the cavity wall (4); the cross-sectional shape of the third ingates (7) is an ellipse, the number of the third ingates (7) is ten and they are arranged along the circumference of the cavity wall (4).

4. A pouring system for a split casing as claimed in claim 3, characterized in that: A riser (11) is provided at the top of the casting cavity (1), and a conformal chill (12) is provided on the side of the cavity wall (4).

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