Heat preservation cup type riser heat preservation structure for casting

Abstract

The utility model relates to a heat preservation cup type riser heat preservation structure for casting. The sand mold comprises a sand mold body, the sand mold body is provided with a first open cavity with one open end, and the bottom wall of the first open cavity extends to form a sand tip; the exothermic riser sleeve is provided with a second opening cavity with an opening at one end; the riser knock-off core is respectively connected with the opening end of the first opening cavity and the exothermic riser sleeve, and the riser knock-off core is provided with a through hole communicated with the second opening cavity; wherein the exothermic riser sleeve is located in the sand mold, an annular cavity is formed between the circumferential side wall of the exothermic riser sleeve and the first opening cavity, and the sand tip is in contact with the end, away from the opening end, of the exothermic riser sleeve. According to the utility model, the feeding efficiency of the riser is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of casting, in particular to a thermos cup type riser insulation structure for casting. Background Art

[0002] When producing castings, exothermic riser sleeves are often used to feed the shrinkage of castings. Exothermic riser sleeves can maintain the temperature of the molten metal for a long time and slow down the temperature drop of the molten metal. Compared with the risers formed directly on the sand mold, the risers using exothermic riser sleeves can more effectively feed the thicker castings. On the contrary, when feeding the same casting position, the risers using exothermic riser sleeves can have a smaller volume and lighter weight, thereby improving the process yield of the casting, reducing production costs, and achieving energy conservation and emission reduction.

[0003] At present, the more commonly used heat-generating riser sleeve is a blind riser sleeve, which is shaped like an inverted cup, with a "V"-shaped groove inside the top surface and a through hole with a smaller diameter for exhaust. However, since the exhaust hole is in direct contact with the sand mold, the exhaust effect is limited, and the exhaust performance inside the riser sleeve depends on the air permeability of the sand mold.

[0004] During use, the heating riser sleeve is prone to two major problems. The first is that the heating riser sleeve will produce gas when burning. If the exhaust is not smooth, pore defects may occur at the contact point between the casting and the riser; the second is that due to the poor air permeability of the molding sand, the air cannot quickly pass through the molding sand into the interior of the riser sleeve, resulting in a lack of air at the top of the riser, making it difficult for the molten iron to flow downward. Eventually, the top molten iron solidifies and forms a crust early, forming the so-called "capping" phenomenon. Once the riser is "capped", air can basically not enter the interior of the riser through the top iron shell, and the molten iron cannot be replenished to the casting cavity, resulting in riser failure. Although the design of the "V"-shaped groove is to delay the solidification time of the molten iron near the groove, buying some time for the air to pass through the sand mold and the riser sleeve to enter the interior, the problem of "capping" of the riser still occurs frequently. Summary of the invention

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the problems of poor exhaust of the riser sleeve and "capping" of the riser sleeve in the prior art.

[0006] In order to solve the above technical problems, the utility model provides a thermos cup type casting riser insulation structure, comprising:

[0007] A sand mold, wherein the sand mold is provided with a first opening cavity with an opening at one end, and a sand tip extends from the bottom wall of the first opening cavity;

[0008] A heat-generating riser sleeve, wherein the heat-generating riser sleeve is provided with a second opening cavity with one end open;

[0009] A riser easy-to-cut piece, connected to the opening end of the first opening cavity and the heat-generating riser sleeve, respectively, and the riser easy-to-cut piece is provided with a through hole communicating with the second opening cavity;

[0010] Wherein, the heat-generating riser sleeve is located in the sand mold and an annular cavity is formed between its circumferential side wall and the first opening cavity, and the sand tip is in contact with an end of the heat-generating riser sleeve away from the opening end.

[0011] In one embodiment of the utility model, the riser easy-to-cut piece and the heat-generating riser sleeve are connected by bonding.

[0012] In one embodiment of the utility model, the riser easy-to-cut piece and the heating riser sleeve are connected by gluing with a core adhesive.

[0013] In one embodiment of the present invention, the riser easy-to-cut piece is annular, and one end thereof facing the heat-generating riser sleeve is provided with an annular step that abuts against the open end of the heat-generating riser sleeve.

[0014] In one embodiment of the present invention, the sand tip and the heating riser sleeve point are in point contact or line contact.

[0015] In one embodiment of the present invention, the sand tip includes at least one conical structure, and the tip thereof is in point contact with the heat-generating riser sleeve.

[0016] In one embodiment of the present invention, the sand tip comprises an annular structure, and its cross-sectional area gradually decreases in a direction away from the bottom wall of the first opening cavity and contacts with the heat-generating riser sleeve line.

[0017] In one embodiment of the present invention, the sand mold includes green sand, cold box, hot box, water glass or metal mold.

[0018] In one embodiment of the present utility model, the material of the riser easy-to-cut piece includes a hot core box, a cold core box, water glass or resin sand.

[0019] In one embodiment of the present utility model, the riser easy-to-cut piece is interference fit with the opening end of the first opening cavity.

[0020] The above technical solution of the utility model has the following advantages compared with the prior art:

[0021] The utility model discloses a thermos cup type riser insulation structure for casting, wherein the heating riser sleeve, the casting mold and the riser easy-to-cut sheet form an integral structure. When the heating riser sleeve burns and generates gas, the gas is very easily discharged into the middle annular cavity, and the middle annular cavity then dissipates heat outwards through the sand mold. Because the surface area of ​​the side wall of the annular cavity is larger than the surface area of ​​the side wall of the riser sleeve, the gas is discharged faster. When the casting needs the molten iron to descend to compensate for shrinkage, the air in the annular cavity is also easier to enter the heating riser sleeve. When the metal liquid level drops slightly, air is replenished, thereby preventing the metal liquid on the top of the riser from solidifying and "capping", thereby improving the shrinkage compensation efficiency of the riser.

[0022] The heating riser sleeve of the utility model has a small contact area with the casting mold. Since most of the surrounding area is surrounded by air, the heating riser sleeve dissipates heat more slowly, which has a better thermal insulation effect, so that the molten metal inside the heating riser sleeve can be kept warm for a longer time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0024] Figure 1 It is a schematic diagram of the main view and section view (point contact) of a thermos cup type casting riser insulation structure of the utility model.

[0025] Figure 2 The utility model is a schematic axial cross-sectional view (line contact) of a thermos cup type casting riser insulation structure.

[0026] Description of the Figures in the Specification:

[0027] 1. Sand mold; 11. First opening of the cavity;

[0028] 2. Heating riser sleeve; 21. Second opening cavity;

[0029] 3. Riser easy-to-cut piece; 31. Through hole; 32. Annular step;

[0030] 4. Sand tip; 41. Conical structure; 42. Ring structure;

[0031] 5. Annular cavity. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0033] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0034] In the present utility model, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present utility model, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0035] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0036] Reference Figure 1 As shown, the utility model is a thermos cup type casting riser insulation structure, comprising:

[0037] A sand mold 1, wherein the sand mold 1 is provided with a first open cavity 11 with an open end, and a sand tip 4 extends from the bottom wall of the first open cavity 11;

[0038] A heat-generating riser sleeve 2, wherein the heat-generating riser sleeve 2 is provided with a second opening cavity 21 with one end open;

[0039] A riser easy-to-cut piece 3, connected to the opening end of the first opening cavity 11 and the heat-generating riser sleeve 2, respectively, and the riser easy-to-cut piece 3 is provided with a through hole 31 communicating with the second opening cavity 21;

[0040] The heat-generating riser sleeve 2 is located in the sand mold 1 and an annular cavity 5 is formed between its circumferential side wall and the first opening cavity 11 , and the sand tip 4 is in contact with an end of the heat-generating riser sleeve 2 away from the opening end.

[0041] Through the above arrangement, the mold of the riser insulation structure is completely not in contact with the circumferential side wall of the heating riser sleeve 2, forming a structure like a "double-layer insulation cup", which is different from the traditional heating riser sleeve 2 being in close contact with the mold. There is air between the mold of the riser insulation structure and the heating riser sleeve 2, and no exhaust hole is made on the top of the riser sleeve.

[0042] The traditional heating riser sleeve 2 has obvious limitations in exhaust, especially the exhaust hole is in direct contact with the sand mold 1, resulting in the exhaust effect relying on the air permeability of the sand mold 1. However, the insulation cup type riser insulation structure of the utility model forms an annular cavity 5 through design, so that the gas generated by the heating riser sleeve 2 during combustion can be more easily discharged into the annular cavity 5, and then discharged outward through the sand mold 1, which significantly improves the exhaust speed and efficiency, and avoids the generation of pore defects due to poor exhaust at the contact part between the casting and the riser.

[0043] In addition, the design of the traditional heating riser sleeve 2 easily causes the molten iron on the top of the riser to solidify prematurely, forming a "capping" phenomenon, which in turn prevents air from entering the interior of the riser, resulting in shrinkage failure. The annular cavity 5 design of the insulation structure of the thermos cup riser makes it easier for air to enter the interior of the heating riser sleeve 2. Even if the metal liquid level drops slightly, air can be quickly replenished, thereby preventing the solidification of the molten metal on the top of the riser. This feature effectively improves the shrinkage efficiency of the riser and ensures that there are no shrinkage cavities and shrinkage inside the casting.

[0044] In one embodiment, the riser easy-to-cut piece 3 is connected to the heating riser sleeve 2 by gluing. The riser easy-to-cut piece 3 and the heating riser sleeve 2 can be firmly glued with a core adhesive and then inserted into the sand mold 1, and the easy-to-cut piece and the opening end of the first opening cavity 11 of the sand mold 1 are interference fit.

[0045] In one embodiment, referring to Figure 2 As shown, the riser easy-to-cut piece 3 is annular, and one end thereof facing the heat-generating riser sleeve 2 is provided with an annular step 32 which abuts against the open end of the heat-generating riser sleeve 2 .

[0046] Specifically, the sand tip 4 and the heating riser sleeve 2 are in point contact or line contact.

[0047] In one embodiment, the sand tip 4 includes at least one conical structure 41 , and the tip thereof is in point contact with the heat-generating riser sleeve 2 .

[0048] In one embodiment, the sand tip 4 includes an annular structure 42 , and its cross-sectional area gradually decreases in a direction away from the bottom wall of the first opening cavity 11 and is in line contact with the heat-generating riser sleeve 2 .

[0049] In one embodiment, the sand mold 1 includes green sand, cold box, hot box, water glass or metal mold.

[0050] When the heat-generating riser sleeve 2 contacts the sand tip 4 of the sand mold 1, if the sand mold 1 is green sand, the heat-generating riser sleeve 2 will hold the green sand. Since the green sand has a certain yieldability, the sand mold 1 will be slightly deformed. If it is other casting molds with higher strength, the riser sleeve will just contact the casting mold.

[0051] In one embodiment, the material of the riser easy-to-cut piece 3 includes a hot core box, a cold core box, water glass or resin sand, and can also be made of insulation materials such as floating beads, a mixture of floating beads and sand, and other materials with high refractoriness.

[0052] Through the above arrangement, the heating riser sleeve 2, the casting mold and the riser easy-to-cut sheet 3 form an integral structure. When the heating riser sleeve 2 burns and generates gas, the gas is easily discharged into the middle annular cavity 5, and the middle annular cavity 5 then dissipates heat outward through the sand mold 1. Because the surface area of ​​the side wall of the annular cavity 5 is larger than the surface area of ​​the side wall of the riser sleeve, the gas is discharged faster; when the casting needs the molten iron to descend to compensate for shrinkage, the air in the annular cavity 5 is also easier to enter the heating riser sleeve 2, and the air is replenished when the metal liquid level drops slightly, which prevents the metal liquid on the top of the riser from solidifying and "capping", thereby improving the shrinkage compensation efficiency of the riser.

[0053] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A thermos cup type casting riser insulation structure, characterized in that: include: A sand mold (1), wherein the sand mold (1) is provided with a first open cavity (11) with an open end, and a sand tip (4) extends from the bottom wall of the first open cavity (11); A heat-generating riser sleeve (2), wherein the heat-generating riser sleeve (2) is provided with a second opening cavity (21) with one end open; A riser easy-to-cut piece (3) connected to the opening end of the first opening cavity (11) and the heat-generating riser sleeve (2), respectively; the riser easy-to-cut piece (3) is provided with a through hole (31) communicating with the second opening cavity (21); The heat-generating riser sleeve (2) is located in the sand mold (1) and an annular cavity (5) is formed between its circumferential side wall and the first opening cavity (11), and the sand tip (4) is in contact with an end of the heat-generating riser sleeve (2) away from the opening end.

2. The insulation cup type casting riser insulation structure according to claim 1, characterized in that: The riser easy-to-cut piece (3) and the heat-generating riser sleeve (2) are connected by gluing.

3. The thermos cup type casting riser insulation structure according to claim 1, characterized in that: The riser easy-to-cut piece (3) and the heat-generating riser sleeve (2) are connected by gluing with a core adhesive.

4. The thermos cup type casting riser insulation structure according to claim 1, characterized in that: The riser easy-to-cut piece (3) is annular, and one end thereof facing the heat-generating riser sleeve (2) is provided with an annular step (32) that abuts against the open end of the heat-generating riser sleeve (2).

5. The thermos cup type casting riser insulation structure according to claim 1, characterized in that: There is point contact or line contact between the sand tip (4) and the heat-generating riser sleeve (2).

6. A thermos cup type casting riser insulation structure according to claim 1 or 5, characterized in that: The sand tip (4) comprises at least one conical structure (41), and the tip thereof is in point contact with the heat-generating riser sleeve (2).

7. A thermos cup type casting riser insulation structure according to claim 1 or 5, characterized in that: The sand tip (4) comprises an annular structure (42), and its cross-sectional area gradually decreases in a direction away from the bottom wall of the first opening cavity (11) and is in linear contact with the heat-generating riser sleeve (2).

8. The thermos cup type casting riser insulation structure according to claim 1, characterized in that: The sand mold (1) includes green sand, cold core box, hot core box, water glass or metal mold.

9. The thermos cup type casting riser insulation structure according to claim 1, characterized in that: The material of the riser easy-to-cut piece (3) includes a hot core box, a cold core box, water glass or resin sand.

10. The thermos cup type casting riser insulation structure according to claim 1, characterized in that: The riser easy-to-cut piece (3) is interference-fitted with the opening end of the first opening cavity (11).

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