Casting sand mold

Abstract

The utility model discloses a casting sand mold. The casting sand mold comprises a lower mold and an upper mold corresponding to the lower mold, the utility model has the key points that a lower mold core, a sprue nest, a lower cross gate and a riser nest are formed on a lower parting surface of a lower mold, a lower riser neck connected with the riser nest and the lower mold core is formed between the riser nest and the lower mold core on the lower parting surface, and the thickness of the lower riser neck is T1; an upper mold cavity, an upper straight pouring gate, an upper riser and an upper transverse pouring gate are formed on an upper parting surface of the upper mold; the diameter of the upper riser is gradually reduced from the connecting end to the free end of the upper riser; the upper parting surface forms an upper riser neck connected with the upper riser and the upper cavity between the upper riser and the upper cavity, the thickness of the upper cross gate is T2, and T2 is equal to (1 / 5-1 / 3) T1, so that the metal liquid in the upper cross gate of the casting sand mold is solidified before the metal liquid in the riser, the riser and the upper cross gate can be disconnected, the riser can feed a casting, and the casting quality is improved. The purpose of improving the feeding effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts casting, in particular to a casting sand mold. Background Art

[0002] The flange or brake housing (casting) of the axle of a heavy vehicle is cast by a coated sand mold, and the coated sand mold is formed by a casting sand mold. The existing casting sand mold includes a lower mold and an upper mold. The lower mold is provided with a lower core, a sprue pocket, a lower runner and a riser pocket. A lower riser neck is provided between the lower core and the riser pocket to connect the two. The upper mold is provided with an upper cavity, an upper sprue, an upper runner and an upper riser. The upper cavity, upper sprue, upper runner and upper riser correspond to the lower core, sprue pocket, lower runner and riser pocket respectively. An upper riser neck is provided between the upper riser and the upper core to connect the two. However, when the sand mold formed by the above-mentioned casting sand mold is used to cast the casting, the casting exhibits shrinkage and shrinkage cavities, resulting in a low yield. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a casting sand mold with good shrinkage feeding effect.

[0004] To achieve the above objectives, the present invention adopts the following technical solutions:

[0005] A casting sand mold, comprising a lower mold and an upper mold corresponding to the lower mold;

[0006] The lower mold has a lower parting surface, the lower parting surface forms a lower core and a sprue pocket, a lower runner, and a riser pocket located on one side of the lower core, the lower runner is connected to the sprue pocket, the lower parting surface forms a lower riser neck connected to the riser pocket and the lower core, and the thickness of the lower riser neck is T1;

[0007] The upper mold has an upper parting surface corresponding to the lower parting surface, and the upper parting surface forms an upper cavity corresponding to the lower core, an upper sprue corresponding to the sprue nest, an upper riser corresponding to the riser nest, and an upper cross runner connected to the upper riser, and the upper sprue, the upper riser and the upper cross runner are located on one side of the upper cavity; the upper riser has a connecting end provided on the upper parting surface and a free end away from the upper parting surface, and the diameter of the upper riser gradually decreases from the connecting end to the free end; the upper parting surface forms an upper riser neck connected to the upper riser and the upper cavity, the upper riser neck corresponds to the lower riser neck, and the thickness of the upper cross runner is T2, T2=(1 / 5~1 / 3)T1.

[0008] Furthermore, T1=38mm, T2=8mm.

[0009] Furthermore, a thin section is provided between the two ends of the upper runner, and the thickness of the thin section is T3, where T3=2 / 3T2.

[0010] Furthermore, the upper riser is tapered.

[0011] Furthermore, the diameter of the connecting end is D1, the diameter of the free end is D2, and D2=0.3D1.

[0012] Furthermore, the lower core has a first direction and a second direction intersecting with the first direction, the lower core has two opposite first sides in the second direction and two opposite second sides in the first direction, the lower parting surface forms a sprue socket on one of the first sides and a riser socket on each of the two second sides, accordingly, there are two upper risers, one upper riser corresponds to one riser socket, and there are two upper cross runners, one upper cross runner corresponds to one upper riser.

[0013] Furthermore, there are two lower runners, which are located on opposite sides of the straight runner nest in the first direction and extend in opposite directions in the first direction. Each upper runner extends along the second direction and its end away from the upper riser corresponds to the lower runner.

[0014] The casting sand mold of the utility model sets the thickness of the lower riser neck to T1 and the thickness of the upper runner to T2, where T2=(1 / 5~1 / 3)T1, so that the metal liquid in the upper runner of the casting sand mold solidifies before the metal liquid in the riser, that is, when the metal liquid in the upper runner of the casting sand mold is in a solid state, the metal liquid in the riser of the casting sand mold is in a liquid state, so that the riser of the sand mold can be disconnected from the upper runner, ensuring that the riser can feed the shrinkage of the casting, thereby achieving the purpose of improving the shrinkage feeding effect, preventing the occurrence of shrinkage porosity and shrinkage cavities, and further improving the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional schematic diagram of the upper mold of the sand mold for castings according to an embodiment of the present utility model;

[0016] Figure 2 This is a three-dimensional schematic diagram of the lower mold of the sand mold for castings according to an embodiment of the present utility model;

[0017] Figure 3 for Figure 2 AA direction cross-sectional view;

[0018] Figure 4 for Figure 3 A magnified view of the local area B;

[0019] Figure 5 for Figure 1 side view. DETAILED DESCRIPTION

[0020] Below, in conjunction with the accompanying drawings and specific embodiments, the utility model is further described:

[0021] like Figures 1 to 5 As shown, an embodiment of the present invention provides a casting sand mold for forming a casting sand mold. The casting sand mold is used to form a brake shell or flange of a heavy vehicle. The casting sand mold includes a lower mold 1 and an upper mold 2 corresponding to the lower mold 1.

[0022] like Figure 2 、 Figure 3 As shown, the lower mold 1 is used for forming a lower sand mold (not shown) of a casting sand mold, and has a lower parting surface 11. The lower parting surface 11 is integrally protruded upward to form a lower core 12 and a sprue cavity 13, a lower runner 14 and a riser cavity 15 located on one side of the lower core 12. The lower runner 14 is connected to the sprue cavity 13. The lower parting surface 11 forms a lower riser neck 16 connected to the riser cavity 15 and the lower core 12 between the two. The thickness of the lower riser neck 16 is T1 (as shown in FIG. Figure 4 Specifically, the lower core 12 has a first direction X and a second direction Y intersecting the first direction X. In this embodiment, the first direction X (length direction) is perpendicular to the second direction Y (width direction). The lower core 12 has two opposing first sides 121 in the second direction Y and two opposing second sides 122 in the first direction X. The lower parting surface 11 has a sprue pocket 13 formed on one first side 121 and a riser pocket 15 formed on each of the two second sides 122. There are two lower runners 14, which are located on opposite sides of the sprue pocket 13 in the first direction X and extend in opposite directions in the first direction X.

[0023] like Figure 1 、 Figure 5As shown, the upper mold 2 is used for forming an upper sand mold (not shown) of a sand mold for a casting, and has an upper parting surface 21 corresponding to the lower parting surface 11. The upper parting surface 21 is formed with an upper cavity 22 corresponding to the lower core 12, an upper sprue 23 corresponding to the sprue nest 13, an upper riser 24 corresponding to the riser nest 15, and an upper runner 25 connected to the upper riser 24. The upper cavity 22 is recessed downward relative to the upper parting surface 21, and the upper sprue 23, the upper riser 24 and the upper runner 25 are located on one side of the upper cavity 22. In this embodiment, there are two upper risers 24, one upper riser 24 corresponds to one riser cavity 15, the upper riser 24 has a connecting end 241 provided on the upper parting surface 21 and a free end 242 away from the upper parting surface 21, and the diameter of the upper riser 24 gradually decreases from the connecting end 241 to the free end 242; there are two upper runners 25, one upper runner 25 corresponds to one upper riser 24, each upper runner 25 extends along the second direction Y and its end away from the upper riser 24 corresponds to the lower runner 14. The upper parting surface 21 is formed with an upper riser neck 26 connected to the upper riser 24 and the upper cavity 22. The upper riser neck 26 corresponds to the lower riser neck 16. When the upper sand mold and the lower sand mold are molded together, an upper riser (24) and a riser cavity 15 form a riser of the casting sand mold. The upper riser neck 26 and the lower riser neck 16 form the riser neck of the casting sand mold, that is, the riser neck of the casting sand mold is T1. The upper runner 25 forms the upper runner of the casting sand mold. The thickness of the upper runner 25 is The metal liquid in the upper runner of the sand casting is solidified before the metal liquid in the riser. That is, when the metal liquid in the upper runner of the sand casting is in a solid state, the metal liquid in the riser of the sand casting is in a liquid state. Therefore, the riser of the sand casting can be disconnected from the upper runner, ensuring that the riser can feed the shrinkage of the casting, thereby achieving the purpose of improving the shrinkage feeding effect, preventing shrinkage and shrinkage holes, and further improving the output rate.

[0024] like Figure 1 、 Figure 5 As shown, specifically, the upper riser 24 is conical. In order to further improve the shrinkage-supporting effect of the riser, the diameter of the connecting end 241 of the upper riser 24 is set to D1, and the diameter of the free end 242 is set to D2, and D2=0.3D1; in this embodiment, in order to minimize the thickness of the upper runner 25 when the metal liquid flows normally, so as to further improve the shrinkage-supporting effect, T1=38mm, T2=8mm is set; in order to further improve the shrinkage-supporting effect, preferably, a thin section 251 is provided between the two ends of the upper runner 25, and the thin section 251 connects the two ends of the upper runner 25, and the thickness of the thin section 251 is T3, T3=2 / 3T2, that is, when T2=8mm, T3=5.33mm.

[0025] The casting sand mold of the utility model sets the thickness of the lower riser neck to T1 and the thickness of the upper runner to T2, where T2=(1 / 5~1 / 3)T1, so that the metal liquid in the upper runner of the casting sand mold solidifies before the metal liquid in the riser, that is, when the metal liquid in the upper runner of the casting sand mold is in a solid state, the metal liquid in the riser of the casting sand mold is in a liquid state, so that the riser of the sand mold can be disconnected from the upper runner, ensuring that the riser can feed the shrinkage of the casting, thereby achieving the purpose of improving the shrinkage feeding effect, preventing the occurrence of shrinkage porosity and shrinkage cavities, and further improving the product yield.

[0026] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. Casting sand mold, characterized in that, It includes a lower mold and an upper mold corresponding to the lower mold; The lower mold has a lower parting surface, the lower parting surface forms a lower core and a sprue pocket, a lower runner, and a riser pocket located on one side of the lower core, the lower runner is connected to the sprue pocket, the lower parting surface forms a lower riser neck connected to the riser pocket and the lower core, and the thickness of the lower riser neck is T1; The upper mold has an upper parting surface corresponding to the lower parting surface, and the upper parting surface forms an upper cavity corresponding to the lower core, an upper sprue corresponding to the sprue nest, an upper riser corresponding to the riser nest, and an upper cross runner connected to the upper riser, and the upper sprue, the upper riser and the upper cross runner are located on one side of the upper cavity; the upper riser has a connecting end provided on the upper parting surface and a free end away from the upper parting surface, and the diameter of the upper riser gradually decreases from the connecting end to the free end; the upper parting surface forms an upper riser neck connected to the upper riser and the upper cavity, the upper riser neck corresponds to the lower riser neck, and the thickness of the upper cross runner is T2, T2=(1 / 5~1 / 3)T1.

2. The casting sand mold according to claim 1, characterized in that: T1=38mm, T2=8mm.

3. The casting sand mold according to claim 1, wherein: A thin section is provided between the two ends of the upper runner, and the thickness of the thin section is T3, where T3=2 / 3T2.

4. The casting sand mold according to claim 1, wherein: The upper riser is tapered.

5. The casting sand mold according to claim 1, wherein: The diameter of the connecting end is D1, the diameter of the free end is D2, and D2=0.3D1.

6. The casting sand mold according to claim 1, wherein: The lower core has a first direction and a second direction intersecting with the first direction. The lower core has two opposite first sides in the second direction and two opposite second sides in the first direction. The lower parting surface forms a sprue nest on one of the first sides and a riser nest on each of the two second sides. Accordingly, there are two upper risers, one upper riser corresponding to one riser nest, and there are two upper cross runners, one upper cross runner corresponding to one upper riser.

7. The casting sand mold according to claim 6, characterized in that: There are two lower runners, which are located on opposite sides of the straight runner nest in the first direction and extend in opposite directions in the first direction. Each upper runner extends along the second direction and its end away from the upper riser corresponds to the lower runner.

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