Stacked flaskless casting sand mold for top pouring method

Abstract

The utility model discloses a stacking flaskless casting sand mould for an upper pouring method, which comprises a plurality of groups of sand moulds which are stacked up and down, each group of sand moulds comprises an upper mould plate and a lower mould plate which are stacked up and down, the lower surface of the upper mould plate is provided with an upper mould cavity, the upper surface of the lower mould plate is provided with a lower mould cavity, and the upper mould cavity and the lower mould cavity are buckled to form a product mould cavity. The upper mold plate and the lower mold plate are provided with sprues which are vertically aligned and communicated, the sprues of the lower mold plate are communicated with the lower mold cavity through a transverse pouring gate, the positions, communicated with the pouring gate, of the sprues of the lower mold plate are provided with upward blocking edges, and the blocking edges obliquely extend upwards along the inner edges of the sprues of the lower mold plate to form horn-shaped birdmouths to shield outwards scattered molten iron. Molten iron is prevented from entering the upper-layer cavity in advance, and the radially scattered molten iron is collected, so that the molten iron can completely fall into the bottom cavity. Therefore, molten iron in each cavity can be fused together to form a finished product, the defect of the appearance of a casting is avoided, and the quality of the casting is improved.

Description

Technical Field

[0001] This utility model relates to the field of casting technology, and in particular to a stacked boxless casting sand mold for top-pouring method. Background Technology

[0002] Top-pour casting refers to a casting method in which molten metal is poured into the mold cavity from the top gate of the sand mold. The principle is to use the gravity of the molten metal itself to make it flow from a high place to a low place, gradually filling the entire mold cavity, thereby obtaining a casting of the desired shape.

[0003] During casting, multiple layers of sand molds are often stacked together, with the gating gates of each layer aligned vertically to form a vertical sprue of a certain height. Each layer of sand mold has a horizontal sprue that connects to the vertical sprue. Molten iron is poured from top to bottom, requiring the molten iron to fill each cavity sequentially from bottom to top. However, in actual operation, due to the significant downward impact force of the molten iron and the fact that the molten iron is not a regular column, a small amount of molten iron may prematurely enter the upper cavity and solidify. This solidified molten iron cannot fuse with the molten iron that normally enters the cavity, resulting in product defects. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a stacked boxless casting sand mold for top pouring method, which can prevent molten iron from entering the upper cavity in advance and reduce product defects.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A stacked flaskless casting sand mold for top-pouring method includes multiple sets of stacked sand molds. Each set of sand molds includes an upper mold plate and a lower mold plate stacked on top of each other. The lower surface of the upper mold plate has an upper cavity, and the upper surface of the lower mold plate has a lower cavity. The upper cavity and the lower cavity are engaged to form a product cavity. The upper mold plate and the lower mold plate have vertically aligned and through gates. The gate of the lower mold plate is connected to the lower cavity through a transverse runner. The lower mold plate has an upward-facing retaining edge at the position where the gate and the runner are connected. The retaining edge extends obliquely upward along the inner edge of the gate of the lower mold plate.

[0007] A further technical solution is that the retaining edge is not higher than 1 / 2 of the runner depth and not lower than 1 / 5 of the runner depth.

[0008] A further technical solution is that the product cavity has an exhaust channel that communicates with the outside.

[0009] A further technical solution is that the exhaust channel is located at the mold closing point of the upper mold plate and the lower mold plate.

[0010] A further technical solution is that each set of sand molds has multiple product cavities.

[0011] A further technical solution involves ensuring that the runners connecting multiple product cavities and gates are of equal length.

[0012] A further technical solution is that a protruding rib is provided on the upper cavity at the position corresponding to the gating, and the protruding rib laterally crosses the gating.

[0013] A further technical solution is that the protruding rib is positioned close to the product cavity.

[0014] A further technical solution is that the upper surface of the upper mold plate has a raised baffle around the gate, the inner diameter of the baffle being larger than the inner diameter of the gate, so that a first positioning groove is formed in the baffle.

[0015] The lower surface of the lower mold plate has a ring-shaped second positioning groove around the gate for the retaining edge to be embedded in, and a positioning ring is formed in the second positioning groove and embedded in the first positioning groove.

[0016] A further technical solution is that the upper surface of the upper mold plate and the lower surface of the lower mold plate have a non-circular positioning structure with interlocking concave and convex shapes.

[0017] The beneficial effects of adopting the above technical solution are as follows:

[0018] The lower mold plate has an upward-facing flange at the junction of the gate and the runner. This flange extends upwards at an angle along the inner edge of the gate, forming a funnel-shaped receiving joint. This flange blocks the outward-spreading molten iron, preventing it from prematurely entering the upper cavity, and collects the radially outward-spreading molten iron, ensuring it all falls into the bottom cavity. This guarantees that the molten iron in each cavity can fuse together to form a complete product, avoiding defects in the casting's shape and improving the casting's quality. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is an exploded structural diagram of the present invention (two sets of sand molds);

[0021] Figure 2 This is an isometric structural schematic diagram of the present invention (two sets of sand molds);

[0022] Figure 3 This is a cross-sectional structural diagram of the present invention (two sets of sand molds);

[0023] Figure 4 This is a schematic diagram of the isometric structure of the lower profile plate in this utility model. Figure 1 ;

[0024] Figure 5This is a schematic diagram of the structure of the upper surface of the lower mold plate in this utility model;

[0025] Figure 6 This is a schematic diagram of the isometric structure of the lower profile plate in this utility model. Figure 2 ;

[0026] Figure 7 This is a schematic diagram of the structure of the lower surface of the lower profile plate in this utility model;

[0027] Figure 8 This is a schematic diagram of the isometric structure of the upper profile plate in this utility model. Figure 1 ;

[0028] Figure 9 This is a schematic diagram of the isometric structure of the upper profile plate in this utility model. Figure 2 . Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] like Figures 1-9As shown, a stacked flaskless casting sand mold for top-pouring method includes multiple sets of stacked sand molds. Each set of sand molds includes an upper mold plate 10 and a lower mold plate 20 stacked on top of each other. The lower surface of the upper mold plate 10 has an upper cavity 110, and the upper surface of the lower mold plate 20 has a lower cavity 210. The upper cavity 110 and the lower cavity 210 are engaged to form a complete product cavity. In each set of sand molds, the upper mold plate 10 and the lower mold plate 20 have vertically aligned and continuous gating gates 1. After multiple sets of sand molds are stacked, the multiple gating gates 1 are connected vertically to form a vertical gating runner 2. In each set of sand molds, the gating gate 1 of the lower mold plate 20 is connected to the lower cavity 210 through the horizontal gating runner 2. To prevent molten iron from prematurely entering the upper cavity when poured from top to bottom, an upward-facing baffle 3 is provided at the position where the upper gate 1 of the lower mold plate 20 connects with the gating system 2. The baffle 3 extends upward at an angle along the inner edge of the gate 1 of the lower mold plate 20, forming an upward-facing flared opening. Preferably, the baffle 3 is no higher than 1 / 2 of the depth of the gating system 2 and no lower than 1 / 5 of the depth of the gating system 2, which satisfies the need to collect the falling molten iron while leaving sufficient openings for the molten iron to smoothly enter the transverse gating system 2.

[0032] The lower mold plate 20 has an upward-facing retaining edge 3 at the position where the gate 1 connects to the runner 2. The retaining edge 3 extends upward at an angle along the inner edge of the gate 1 of the lower mold plate 20, forming a funnel-shaped receiving interface. This retaining edge blocks the outward-spreading molten iron, preventing it from prematurely entering the upper cavity, and collects the radially outward-spreading molten iron, allowing it to fall entirely into the bottom cavity. This ensures that the molten iron in each cavity can fuse together to form a complete product, avoiding defects in the casting's shape and improving the quality of the casting.

[0033] To ensure the molten iron can smoothly enter the product cavity, an exhaust channel 211 communicating with the outside is provided in the product cavity. When the molten iron flows into the product cavity, it squeezes out the gas inside the product cavity. The exhaust channel 211 is not oriented downwards. Preferably, the exhaust channel 211 is located at the mold closing point of the upper mold plate 10 and the lower mold plate 20. A groove can be provided on the side wall and top surface of the lower mold cavity 210 to communicate with the outside.

[0034] When the product size is small, multiple product cavities are provided on each sand mold to improve the utilization rate. To ensure that multiple product cavities in the same layer are filled simultaneously, the runners 2 connecting the multiple product cavities to the gate 1 are of equal length.

[0035] After the product is formed, in order to better separate the product from the sprue 2 and obtain the final product, a protrusion 111 is provided on the upper cavity 110 at the position corresponding to the sprue 2. The protrusion 111 extends laterally across the sprue 2. After casting, there will be a groove between the product and the sprue 2, which concentrates the stress and allows the product to separate from the sprue 2 at this point. Preferably, the protrusion 111 is set close to the product cavity to avoid the break point being biased towards the product, causing product defects, or the break point being too far from the product, increasing the workload of subsequent grinding.

[0036] During assembly, in order to align the upper mold plate 10 with the lower mold plate 20, the upper surface of the upper mold plate 10 and the lower surface of the lower mold plate 20 have a non-circular positioning structure with interlocking concave and convex shapes.

[0037] To prevent molten iron from seeping out from the joint between each set of sand molds (i.e., between the lower surface of the lower mold plate 20 in the upper set of sand molds and the upper surface of the upper mold plate 10 in the lower set of sand molds), a raised retaining edge 120 is provided around the gate 1 on the upper surface of the upper mold plate 10, and a second positioning groove 220 is provided around the gate 1 on the lower surface of the lower mold plate 20 for the retaining edge 120 to be embedded. The retaining edge 120 can prevent molten iron from seeping out from the joint between the upper and lower sets of sand molds.

[0038] Furthermore, the inner diameter of the retaining flange 120 is larger than the inner diameter of the gate 1, resulting in a first positioning groove 130 formed within the retaining flange 120. A positioning ring 230 is formed within the second positioning groove 220 and embedded in the first positioning groove 130. The positioning ring 230, by engaging with the first positioning groove 130, also serves a positioning function.

[0039] The above are merely preferred embodiments of this utility model. Any simple modifications, variations, and equivalent substitutions made by any person based on the content of this utility model shall fall within the protection scope of this utility model.

Claims

1. A stacked flaskless casting sand mold for top-pouring method, comprising multiple sets of stacked sand molds, each set of sand molds comprising an upper mold plate (10) and a lower mold plate (20) stacked vertically, the lower surface of the upper mold plate (10) having an upper cavity (110), the upper surface of the lower mold plate (20) having a lower cavity (210), the upper cavity (110) and the lower cavity (210) being engaged to form a product cavity, the upper mold plate (10) and the lower mold plate (20) having vertically aligned and through gates (1), the gate (1) of the lower mold plate (20) being connected to the lower cavity (210) through a transverse runner (2), characterized in that, The lower mold plate (20) has an upward-facing retaining edge (3) at the position where the upper gate (1) connects with the runner (2). The retaining edge (3) extends upward at an incline along the inner edge of the lower mold plate (20) gate (1).

2. The stacked flaskless casting sand mold for top-pouring method according to claim 1, characterized in that, The retaining edge (3) is not higher than 1 / 2 of the depth of the gating (2) and not lower than 1 / 5 of the depth of the gating (2).

3. The stacked flaskless casting sand mold for top-pouring method according to claim 1, characterized in that, The product cavity has an exhaust channel (211) that communicates with the outside.

4. The stacked flaskless casting sand mold for top-pouring method according to claim 3, characterized in that, The exhaust channel (211) is located at the mold closing point between the upper mold plate (10) and the lower mold plate (20).

5. The stacked flaskless casting sand mold for top-pouring method according to claim 1, characterized in that, Each set of sand molds has multiple product cavities.

6. The stacked flaskless casting sand mold for top-pouring method according to claim 5, characterized in that, The runners (2) connecting the multiple product cavities and gates (1) are of equal length.

7. The stacked flaskless casting sand mold for top-pouring method according to claim 1, characterized in that, The upper cavity (110) is provided with a protrusion (111) at the position corresponding to the gating (2), and the protrusion (111) crosses the gating (2) laterally.

8. The stacked flaskless casting sand mold for top-pouring method according to claim 7, characterized in that, The protruding rib (111) is positioned close to the product cavity.

9. The stacked flaskless casting sand mold for top-pouring method according to claim 1, characterized in that, The upper surface of the upper mold plate (10) has a raised flange (120) surrounding the gate (1), the inner diameter of the flange (120) being larger than the inner diameter of the gate (1), so that a first positioning groove (130) is formed in the flange (120). The lower surface of the lower mold plate (20) has a ring-shaped second positioning groove (220) surrounding the gate (1) for the baffle (120) to be embedded in, and a positioning ring (230) is formed in the second positioning groove (220) and embedded in the first positioning groove (130).

10. The stacked flaskless casting sand mold for top-pouring method according to claim 1, characterized in that, The upper surface of the upper mold plate (10) and the lower surface of the lower mold plate (20) have a non-circular positioning structure with interlocking concave and convex shapes.

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