Fan-shaped forming ingate for annular part

Abstract

The utility model relates to the field of precision casting, and particularly discloses an annular part fan type forming ingate, which comprises a center pillar sprue, a shunting disc and a cross gate, the bottom of the center pillar sprue is connected with the center of the shunting disc, the center pillar sprue is provided with a necking structure, and the cross gate is connected with the shunting disc. The cross gates are of an arc-shaped structure and are distributed on the periphery of the flow dividing disc in an annular array manner; according to the utility model, the necking structure is arranged on the center pillar sprue, so that the inflow amount of molten metal in the shunting disc during mold filling is reduced, and the cross gate with the arc-shaped structure is used for shunting, changing the mold filling direction of the molten metal, reducing the flow speed of the molten metal during mold filling, reducing the thermal shock of the molten metal to the interior of a shell, and achieving the purpose that the molten metal smoothly and uniformly fills the mold to the shell; thermal shock overheating in the casting is avoided, sequential solidification of the casting after mold filling is ensured, and the precision of the casting is improved.

Description

Technical Field

[0001] The utility model relates to the field of precision casting, in particular to a fan-shaped forming ingrown of an annular part. Background Art

[0002] In the investment casting process design, the nozzle ring, guide and other annular castings are often cast by a gating system with a top injection and an inner gate shrinkage compensation structure for the upper and lower or inner and outer flanges according to their flange and blade structures. The inner gate gating system needs to control the metal liquid filling speed. The filling speed not only affects the direction of the metal liquid in different parts of the casting, but also affects the thermal shock of the metal liquid on the blades in the annular parts. In turn, the temperature field at the blade can be determined. If the thermal shock of the metal liquid on the blade is too large, it will cause the shell at the blade to overheat, affecting the sequential solidification and dimensional deformation of the casting.

[0003] The existing ingode pouring channel for annular parts generally adopts a straight runner from the pouring cup and the diverter plate to the bottom, and then connects several cross runners to the bottom flange of the casting through the diverter plate. When filling the mold, the molten metal flows into the top and bottom pouring systems from the diverter plate. Since the bottom cross runner gate pressure head is higher, it brings greater kinetic energy to the filling molten metal, which makes the molten metal filling rate faster and the thermal impulse large. It is easy to directly impact the mold shell to cause overheating, affecting the sequential solidification of the casting and easily causing deformation of the casting size. To this end, the present application proposes a fan-shaped ingode pouring channel for annular parts to solve the above problems. Utility Model Content

[0004] In view of the existing problems, the utility model provides a ring-shaped fan-shaped molding ingrown, which can effectively solve the problems raised in the background technology.

[0005] In order to solve the above problems, the utility model adopts the following technical solutions:

[0006] A ring-shaped fan-shaped ingrown includes a center column sprue, a diverter plate and a cross runner. The bottom of the center column sprue is connected to the center of the diverter plate. The center column sprue is provided with a necking structure. The cross runner is an arc structure and is distributed in a ring array on the periphery of the diverter plate.

[0007] As a further solution of the utility model: the necking structure is arranged at 50 mm from the top to the bottom of the central column sprue.

[0008] As a further solution of the utility model: the necking structure includes an inverted frustum, a necking column and a right frustum connected in sequence from top to bottom, the large surface dimensions of the inverted frustum and the right frustum are consistent with the dimensions of the center column straight runner, and the small surface dimensions of the inverted frustum and the right frustum are consistent with the dimensions of the necking column.

[0009] As a further solution of the utility model: the side inclination angle of the inverted circular frustum is smaller than the side inclination angle of the right circular frustum.

[0010] As a further solution of the utility model: the side inclination angle of the inverted circular frustum is 15°, and the side inclination angle of the right circular frustum is 20°.

[0011] As a further solution of the utility model: the number of the cross runners is six, and the angle between the cross runners and the diverter plate is 87-92°.

[0012] As a further solution of the utility model: a riser structure is provided at the end of the runner, and the riser structure is connected to the ring member.

[0013] As a further solution of the utility model: the riser structure has a vertical draft of 12° and a lateral draft of 5°.

[0014] Compared with the prior art, the utility model has the following beneficial effects: the utility model arranges a necking structure on the center column straight runner to reduce the inflow of molten metal in the diverter plate during filling, and uses an arc-shaped cross runner for diversion, changes the direction of molten metal filling, reduces the flow rate of molten metal during filling, reduces the thermal shock of molten metal on the mold shell, achieves smooth and uniform filling of the mold shell by molten metal, avoids overheating due to thermal shock inside the casting, ensures sequential solidification of the casting after filling, and improves the precision of the casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the overall structure of a ring-shaped fan-shaped molding ingrown;

[0016] Figure 2 It is a schematic side view of the overall structure of a fan-shaped ingrown for an annular part;

[0017] Figure 3 It is a top view of the overall structure of a ring-shaped fan-shaped molding ingrown.

[0018] In the figure: 1. Center column straight runner; 2. Diverter plate; 3. Horizontal runner; 4. Neck reduction structure; 5. Inverted frustum; 6. Neck reduction column; 7. Right frustum; 8. Riser structure. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Combination Figures 1 to 3 To explain the present embodiment, the present embodiment provides a fan-type molding inner runner for an annular part, which includes a center column sprue 1, a diverter plate 2 and a cross runner 3. The top of the center column sprue 1 is connected to a pouring cup, and the cross runner 3 is connected to a flange at the bottom of the casting. The size of the center column sprue 1 is φ30mm*230mm, and the size of the diverter plate 2 is φ60mm*20mm. The bottom of the center column sprue 1 is connected to the center of the diverter plate 2. The cross runner 3 is an arc structure and is distributed in a circular array on the periphery of the diverter plate 2. After the molten metal flows from the center column sprue 1 into the diverter plate 2, it is evenly diverted and flows out from the cross runner 3. A necking structure 4 is provided on the center column sprue 1, and the necking structure 4 is provided at 50mm from the top to the bottom of the center column sprue 1.

[0021] The necking structure 4 includes an inverted circular frustum 5, a necking column 6 and a right circular frustum 7 connected in sequence from top to bottom. The size of the necking column 6 is φ17mm*55mm. The large surface sizes of the inverted circular frustum 5 and the right circular frustum 7 are consistent with the size of the center column sprue 1, and the small surface sizes of the inverted circular frustum 5 and the right circular frustum 7 are consistent with the size of the necking column 6. The side inclination angle of the inverted circular frustum 5 is smaller than the side inclination angle of the right circular frustum 7. Specifically, the side inclination angle of the inverted circular frustum 5 is 15°, and the side inclination angle of the right circular frustum 7 is 20°.

[0022] Six runners 3 are provided, and the angle between the runner 3 and the diverter plate 2 is 87-92°, so that the side connection between the runner 3 and the diverter plate 2 is approximately vertical, and the cross-sectional size of the runner 3 is 20mm*20mm, and the arc size is R50mm. A riser structure 8 is provided at the end of the runner 3, and the riser structure 8 is connected to the ring part. When connected, the angle between the riser structure 8 and the ring part is small and approximately tangent. The length of the riser structure 8 is 25mm, and the riser structure 8 has an upper and lower draft of 12° and a lateral draft of 5°.

[0023] In practical applications, the runner size is allowed to be modified according to the casting size and process requirements. The fan-shaped molding runner of the utility model is intended to design a structure that improves the filling effect of the inner gate.

[0024] The specific application solution is that in the process of pouring the group of trees, the fan-shaped forming internal runner is bonded to the pouring cup and the internal flange of the casting. Due to the necking structure 4 of the middle column sprue 1, it can limit the flow of the molten metal injected into the internal runner, avoiding the problem of uneven distribution of the molten metal in the internal and external gating systems during filling. The inverted frustum 5 above the necking structure 4 has a smaller draft angle and is easier to introduce the molten metal to flow in. Then, the flow rate of the molten metal is controlled by the diameter size of the necking. The positive frustum 7 below has a larger draft angle and is more conducive to the introduced molten metal entering the bottom quickly along with the middle column. The structure of the distributing plate 2 facilitates evenly filling the injected molten metal into the six arc-shaped cross runners 3, avoiding too large a difference in the amount of molten steel entering the six arc-shaped cross runners 3. The cross runner 3 is approximately perpendicular to the distributing plate 2, and the molten metal is easier to be introduced into the arc-shaped cross runner 3; the other end is approximately tangent to the casting flange, avoiding the direct impact of the molten metal flow on the flange and the shell of the blade, causing overheating. In addition, the blade structure connected to the flange in the casting has a certain angle cut on the intake and exhaust edges. The connection structure between the above-mentioned arc-shaped cross runner 3 and the flange is also more conducive to the filling of the molten metal into the inside of the blade, and also reduces the risk of undercasting of the blade.

[0025] The working principle of the present utility model is as follows: The present utility model is provided with a necking structure 4 on the middle column sprue 1 to reduce the inflow of the molten metal in the distributing plate 2 during filling, and uses the arc-shaped cross runner 3 for diversion, changing the filling direction of the molten metal, reducing the flow rate of the molten metal during filling, reducing the thermal shock of the molten metal to the inside of the shell, achieving a gentle and uniform filling of the shell by the molten metal, avoiding overheating of the internal thermal shock of the casting, ensuring the sequential solidification of the casting after filling, and improving the accuracy of the casting.

[0026] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0027] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A ring-shaped fan-shaped sprue, comprising a center column sprue, a diverter plate and a runner, characterized in that: The bottom of the central column sprue is connected to the center of the diverter plate, a necking structure is provided on the central column sprue, and the cross runner is an arc structure and is distributed in a ring array on the periphery of the diverter plate.

2. The annular fan-shaped forming ingrown according to claim 1, characterized in that: The necking structure is arranged at 50 mm from the top to the bottom of the center column sprue.

3. A ring-shaped fan-shaped forming ingrown according to claim 1 or 2, characterized in that: The necking structure includes an inverted frustum, a necking column and a right frustum connected in sequence from top to bottom. The large surface dimensions of the inverted frustum and the right frustum are consistent with the dimensions of the center column straight runner, and the small surface dimensions of the inverted frustum and the right frustum are consistent with the dimensions of the necking column.

4. The annular fan-shaped forming ingrown according to claim 3, characterized in that: The side inclination angle of the inverted circular frustum is smaller than the side inclination angle of the right circular frustum.

5. The annular fan-shaped forming ingrown according to claim 4, characterized in that: The side inclination angle of the inverted circular frustum is 15°, and the side inclination angle of the right circular frustum is 20°.

6. The annular fan-shaped forming ingrown according to claim 1, characterized in that: The number of the cross runners is six, and the angle between the cross runners and the diverter plate is 87-92°.

7. A ring-shaped fan-shaped forming ingrown according to claim 1 or 6, characterized in that: A riser structure is provided at the end of the runner, and the riser structure is connected to the ring member.

8. The annular fan-shaped forming ingrown according to claim 7, characterized in that: The riser structure has a vertical draft of 12° and a lateral draft of 5°.

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