Riser device for sand mold gravity casting

Abstract

The utility model relates to the technical field of sand casting, and aims to solve the problem that the quality of a casting is relatively low due to the fact that a top sealing layer is easy to appear in an existing plane riser device. The utility model provides a riser device for sand mold gravity casting, which comprises a cylinder body, and a conical groove body is arranged in the top of the cylinder body; the conical groove body comprises an expansion opening and a contraction opening; the expansion opening is flush with the opening in the top end of the cylinder body; the contraction opening is oppositely arranged at the bottom of the expansion opening and is communicated with the inner cavity of the barrel body; according to the dead head device for sand mold gravity casting, the shrinkage opening of the conical groove body is communicated with the inner cavity of the barrel body, so that heat is conveniently gathered, the situation that molten metal in the dead head is solidified and sealed in the re-feeding process is relieved, the feeding effect is improved, and the quality of casting products is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of sand casting, in particular to a riser device for sand gravity casting. Background Art

[0002] A riser is a supplementary part added to the top or side of a casting to prevent defects. In a casting mold, the riser cavity is a cavity that stores liquid metal. It replenishes metal during casting formation, preventing shrinkage cavities, shrinkage, venting, and slag accumulation. The main function of a riser is to compensate for shrinkage. In the prior art, risers are primarily planar risers, meaning their tops are located in a uniform plane. For example, Patent Publication No. CN210940114U discloses a hot core riser casting mold, which has a planar riser.

[0003] However, when using ordinary flat risers to feed the shrinkage of castings, the phenomenon of "capping" of the riser often occurs. That is, a complete solid metal layer is formed on the top of the riser without any perforations. The molten metal on the top of the riser does not flow down the riser and does not play the role of shrinkage feeding, resulting in shrinkage defects in the casting.

[0004] Based on the above description, there is an urgent need for a riser device that can effectively prevent a sealing layer from forming on the top of the riser. Utility Model Content

[0005] The utility model aims to provide a riser device for sand gravity casting, aiming to solve the technical problem that the existing plane riser device is prone to top sealing layer and causes low casting quality.

[0006] The embodiments of the present invention are achieved through the following technical solutions:

[0007] A riser device for sand gravity casting includes a cylinder, wherein a conical trough is provided in the top of the cylinder; the conical trough includes an expansion opening and a contraction opening; the expansion opening is flush with the top opening of the cylinder; the contraction opening is arranged at the bottom of the expansion opening and is connected to the inner cavity of the cylinder.

[0008] Preferably, a groove is provided on the top of the cylinder; the groove is communicated with the top groove cavity of the conical groove body.

[0009] Preferably, the groove is a V-shaped groove; the first side end of the V-shaped groove is connected to the top side of the conical groove body.

[0010] Preferably, the depth of the contraction opening is lower than the depth of the bottom wall of the V-shaped groove.

[0011] Preferably, the horizontal angle of the conical trough body ranges from 30° to 60°.

[0012] Preferably, the horizontal angle of the V-shaped groove is in the range of 40-60°.

[0013] Preferably, the diameter of the tapered trough body is less than half of the outer diameter of the tapered trough body.

[0014] Preferably, the depth of the tapered trough body is 1-1.5 times the outer diameter of the tapered trough body.

[0015] Preferably, the inner diameter of the expanded end of the V-shaped groove is 0.5-0.8 times the outer diameter of the tapered groove body.

[0016] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0017] The utility model provides a riser device for sand gravity casting, in which the shrinkage port of the tapered trough body is communicated with the inner cavity of the cylinder body, thereby facilitating the accumulation of heat and slowing down the solidification and capping of the molten metal in the riser during the shrinkage feeding process, thereby improving the shrinkage feeding effect and ensuring the quality of the casting product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the application of the utility model;

[0020] Figure 2 It is a structural diagram of the utility model;

[0021] Figure 3 for Figure 2 Cross-sectional view of the local structure;

[0022] Figure 4 for Figure 3 Cross-section of

[0023] Figure 5 for Figure 3 Top view of .

[0024] Icon: 1-cylinder, 11-V-groove, 2-conical trough, 21-expansion mouth, 22-contraction mouth, 3-sand mold, 4-casting. DETAILED DESCRIPTION

[0025] Example 1

[0026] See also Figures 1 to 5The utility model provides the following technical solutions: a riser device for sand gravity casting, which is suitable for sand casting.

[0027] Specifically, if Figures 1 to 5 As shown, a riser device for sand gravity casting includes a cylinder 1, and a conical trough body 2 is provided on the top of the cylinder 1; the conical trough body 2 includes an expansion opening 21 and a contraction opening 22; the expansion opening 21 is flush with the top opening of the cylinder 1; the contraction opening 22 is relatively arranged at the bottom of the expansion opening 21 and is connected to the inner cavity of the cylinder 1.

[0028] In this embodiment, the conical trough body 2 is a conical trough body or a pyramidal trough body, wherein the contraction port 22 of the conical trough body 2 is connected to the inner cavity of the cylinder 1, thereby facilitating the accumulation of heat and slowing down the solidification and capping of the molten metal in the riser, thereby improving the shrinkage compensation effect and ensuring the quality of the casting product.

[0029] Specifically, if Figure 1 and Figure 2 As shown, a groove is relatively provided on the top of the cylinder 1; the groove is communicated with the top groove cavity of the conical groove body 2.

[0030] In this embodiment, the groove is a V-shaped groove 11; the first side end of the V-shaped groove 11 is connected to the top side of the conical groove body 2 and the bottom of the V-shaped groove 11 is a plane; by further setting the V-shaped groove 11, it can not only further gather heat, but also play a role in buffering and facilitating demolding.

[0031] In this embodiment, the depth of the contraction opening 22 is lower than the depth of the bottom wall of the V-shaped groove 11 , thereby facilitating demoulding and gathering heat to allow the molten metal to solidify and form a cap.

[0032] In this embodiment, the horizontal angle range of the conical trough body 2 is 30-60°; the horizontal angle range of the V-shaped groove 11 is 40-60°, so as to form a good heat-collecting inner cavity, facilitate the rapid flow and replenishment of molten metal, slow down the capping during shrinkage, and facilitate demolding.

[0033] In this embodiment, the diameter of the tapered trough body 2 is less than half of its outer diameter. The depth of the tapered trough body 2 is 1-1.5 times its outer diameter. The inner diameter of the expanded end of the V-shaped groove 11 is 0.5-0.8 times the outer diameter of the tapered trough body 2. This facilitates the accumulation of a certain amount of molten metal as a feeding solution while ensuring easy demolding, meeting the feeding requirements and preventing solidification and capping.

[0034] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A riser device for sand gravity casting, comprising a cylinder (1), characterized in that: A conical trough (2) is provided in the top of the cylinder (1); the conical trough (2) comprises an expansion opening (21) and a contraction opening (22); the expansion opening (21) is flush with the top opening of the cylinder (1); the contraction opening (22) is arranged at the bottom of the expansion opening (21) and is in communication with the inner cavity of the cylinder (1).

2. The riser device for sand gravity casting according to claim 1, characterized in that: A groove is provided on the top of the cylinder (1); the groove is communicated with the top groove cavity of the conical groove body (2).

3. The riser device for sand gravity casting according to claim 2, characterized in that: The groove is a V-shaped groove (11); a first side end of the V-shaped groove (11) is in communication with the top side of the conical groove body (2).

4. The riser device for sand gravity casting according to claim 3, characterized in that: The depth of the contraction opening (22) is lower than the depth of the bottom wall of the V-shaped groove (11).

5. The riser device for sand gravity casting according to claim 3 or 4, characterized in that: The horizontal angle of the conical trough body (2) is in the range of 30-60°.

6. The riser device for sand gravity casting according to claim 5, characterized in that: The horizontal angle range of the V-shaped groove (11) is 40-60°.

7. The riser device for sand gravity casting according to claim 5, characterized in that: The diameter of the tapered trough body (2) is less than half of the outer diameter of the tapered trough body (2).

8. The riser device for sand gravity casting according to claim 7, characterized in that: The depth of the tapered trough body (2) is 1-1.5 times the outer diameter of the tapered trough body (2).

9. The riser device for sand gravity casting according to claim 8, characterized in that: The inner diameter of the expanded end of the V-shaped groove (11) is 0.5-0.8 times the outer diameter of the tapered groove body (2).

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