Sand box for sand casting

Abstract

The utility model relates to the technical field of casting and metallurgy, in particular to a sand box for sand mold casting, which comprises a first sand box, a second sand box and a pouring part, a plurality of stacked sand cores are arranged in the first sand box and the second sand box, the plurality of sand cores form a sand mold, and the pouring part is arranged in the sand mold. The pouring part comprises a pouring cup, a straight pouring gate and a plurality of bidirectional pouring cross pouring gates which are communicated in sequence, and casting molten iron passing through the pouring part is injected into the sand mold. According to the sand box for sand mold casting, the production quality of large-diameter castings is improved, the pouring time is greatly shortened, meanwhile, the utilization rate of the space in the sand box and molding sand is increased, and waste of the molding sand and molten iron is also avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of casting and metallurgy, in particular to a sand box for sand casting. Background Art

[0002] For castings with large diameters, one piece per box is generally used when producing on a casting molding line, such as Figure 1 , resulting in low efficiency, low process yield and long pouring time of the existing casting process. In order to solve this problem, sometimes a method of one box two pieces is adopted, that is, one box produces two pieces, such as Figure 2 As shown, the efficiency is improved to a certain extent by placing two castings back to back in the sand box and placing a partition sand core between the two castings. However, in this stacked box casting production method, after the casting molten iron 15 fills the mold cavity, the diameter of the support part 16 located in the middle position is too small relative to the diameter of the casting, that is, the supporting area of ​​the support part 16 is small, so that the supporting force of the support part 16 is reduced. Therefore, under the buoyancy of the casting molten iron 15, the partition sand core floats up, and then the concave center of the upper casting 13 and the convexity of the lower casting 14 are deformed, which seriously affects the production quality of large-diameter castings; and for castings with a short height, the space in the sand box and the utilization rate of the molding sand are low, resulting in serious waste of molding sand and molten iron. Utility Model Content

[0003] In order to solve the above technical problems existing in the prior art, the utility model provides a sand box for sand casting.

[0004] The technical solution of the utility model to solve the above technical problems is as follows:

[0005] The utility model provides a sand box for sand casting, comprising a first sand box, a second sand box and a pouring component, wherein a plurality of stacked sand cores are provided in the first sand box and the second sand box, and the plurality of sand cores form a sand mold, and the pouring component comprises a pouring cup, a straight runner and a plurality of bidirectional pouring runners connected in sequence, and the casting molten iron passing through the pouring component is injected into the sand mold.

[0006] The sand box for sand casting provided by the utility model forms a sand mold for forming a single casting on both sides of the sand core, reduces the pouring amount of molten iron in a certain space, avoids the technical problem of floating and deformation of the partition sand core caused by excessive buoyancy of the molten iron, improves the production quality of large-diameter castings, and improves the utilization rate of the space in the sand box and the molding sand, and avoids the waste of molding sand and molten iron.

[0007] On the basis of the above technical solution, the present invention can also make the following technical improvements:

[0008] Furthermore, the first flask is an upper flask, the second flask is a lower flask, and the pouring cup is arranged on the upper flask.

[0009] Furthermore, the pouring cup and the sprue are arranged on the center line of the sand box.

[0010] The beneficial effect of adopting the above-mentioned further technical solution is that the pouring cup and the sprue are arranged on the center line of the sand box, which facilitates the two-way pouring of molten iron and ensures that the flow rate and solidification rate of the molten iron on both sides are equivalent, thereby improving the quality of the casting.

[0011] Furthermore, the runner includes a first runner and a second runner, and the first runner and the second runner are symmetrically arranged on both sides of the sprue.

[0012] The beneficial effect of adopting the above-mentioned further technical solution is to ensure that the flow rate and solidification rate of the molten iron flowing through the first runner and the second runner are equivalent, so as to improve the quality of the casting.

[0013] Furthermore, the number of the first runner, the second runner and the sand mold are equal.

[0014] The beneficial effect of adopting the above-mentioned further technical solution is to ensure that each sand mold can realize bidirectional pouring of molten iron.

[0015] Furthermore, the casting component further includes an inner gate, and the inner gate connects the runner and the sand mold.

[0016] Furthermore, the side wall of the sand core is provided with a positioning piece.

[0017] The beneficial effect of adopting the above-mentioned further technical solution is that each sand core is positioned by the positioning piece, thereby ensuring positioning accuracy and improving the processing accuracy of the casting.

[0018] Furthermore, there are one or more positioning members. When there are multiple positioning members, the positioning members are symmetrically or spaced apart along the circumference of the sand core.

[0019] The beneficial effects of adopting the above-mentioned further technical solution are: ensuring positioning accuracy and improving casting processing accuracy.

[0020] Compared with the prior art, the present invention has the following technical effects:

[0021] The sand box for sand casting provided by the utility model forms a sand mold for forming a single casting on both sides of the sand core, reduces the pouring amount of molten iron in a certain space, avoids the technical problem of floating of the partition sand core caused by excessive buoyancy of the molten iron, improves the production quality of large-diameter castings, and improves the utilization rate of the space in the sand box and the molding sand, and avoids the waste of molding sand and molten iron. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of one box and one piece in the prior art;

[0023] Figure 2 This is a schematic diagram of the structure of one box with two pieces in the prior art;

[0024] Figure 3 This is a schematic structural diagram of a sand box for sand casting according to an embodiment of the present invention;

[0025] Figure 4 It is a structural diagram of the positioning member;

[0026] Reference numerals:

[0027] 1. Upper flask; 2. Lower flask; 3. Sand core; 4. Sand mold; 5. Gate cup; 6. Sprue; 7. First runner; 8. Second runner; 9. Ingate; 10. Positioning piece; 11. Lower flask cavity; 13. Upper casting; 14. Lower casting; 15. Casting water; 16. Support part. DETAILED DESCRIPTION

[0028] The following is an explanation of the implementation of the present invention by means of specific specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide an in-depth understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0029] like Figure 3As shown, a sand box for sand casting includes an upper sand box 1, a lower sand box 2 and a pouring component, wherein the upper sand box 1 and the lower sand box 2 are provided with stacked sand cores 3, and sand molds 4 for molten iron to flow into are formed on both sides of the sand core 3 for forming castings; the pouring component includes a pouring cup 5, a sprue 6, a plurality of bidirectional pouring runners and an inner gate 9 connected in sequence, the pouring cup 5 is arranged on the upper sand box 1, the pouring cup 5 and the sprue 6 are arranged on the center line of the sand box, and the sprue 6 runs through each sand core 3, the runner includes a first runner 7 and a second runner 8, the first runner 7 and the second runner 8 are symmetrically arranged on both sides of the sprue 6, and are used to evenly introduce the molten iron into the sand mold 4 located on both sides of the sprue 6 to ensure the molding quality of the casting.

[0030] The number of the first runner 7, the second runner 8 and the sand mold 4 are all equal, that is, each sand mold 4 is provided with a first runner 7 and a second runner 8 located on both sides of the straight runner 6. After the molten iron is injected through the pouring cup 5, it flows through the straight runner 6 through the first runner 7 and the second runner 8 connected to it, and then flows to both sides of the sand core 3 through the first runner 7 and the second runner 8 respectively, so as to ensure the uniformity of the molten iron filling in each sand mold 4, so as to ensure the molding quality of the casting.

[0031] See also Figure 4 The side wall of the sand core 3 is provided with a plurality of positioning members 10 , and the positioning members 10 are symmetrically distributed along the circumference of the sand core 3 to ensure the precise positioning of the stacked sand cores 3 .

[0032] The casting in the embodiment of the present invention is a brake disc or a brake drum, which has a relatively large diameter and is an oblate structure.

[0033] When using the sand casting flask of the present invention for casting production, first, multiple sand cores 3 are stacked in sequence and placed into the lower box cavity 11 of the lower flask 2, then the upper flask 1 is closed, and the casting molten iron is introduced from the pouring cup 5 through the straight runner 6 into the first horizontal runner 7 and the second horizontal runner 8, and then flows into the sand mold located on both sides of the center line of the flask. After cooling and solidification, the casting is obtained.

[0034] The sand box for sand casting provided by the utility model improves the appearance quality and dimensional accuracy of the produced castings, and improves the production quality of large-diameter castings; the output per unit time is increased several times, the utilization rate of the space in the sand box and the molding sand is improved, and the waste of molding sand and molten iron is avoided; the pouring time is greatly shortened, and batch continuous pouring production is realized, thereby improving production efficiency.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sand box for sand casting, characterized in that: It includes a first sand box, a second sand box and a casting component. The first sand box and the second sand box are provided with a plurality of stacked sand cores, and the plurality of sand cores form a sand mold. The casting component includes a pouring cup, a straight runner and a plurality of bidirectional pouring cross runners connected in sequence. The molten iron is injected into the sand mold through the casting component.

2. The sand casting flask according to claim 1, wherein: The first flask is an upper flask, the second flask is a lower flask, and the pouring cup is arranged on the upper flask.

3. The sand casting flask according to claim 2, wherein: The pouring cup and the sprue are arranged on the center line of the sand box.

4. The sand casting flask according to claim 3, wherein: The runner includes a first runner and a second runner, and the first runner and the second runner are symmetrically arranged on both sides of the sprue.

5. The sand casting flask according to claim 4, wherein: The number of the first horizontal runner, the second horizontal runner and the sand mold are all equal.

6. The sand casting flask according to claim 1, wherein: The casting component further includes an inner gate, which connects the runner and the sand mold.

7. The sand casting flask according to claim 1, wherein: The side wall of the sand core is provided with a positioning piece.

8. The sand casting flask according to claim 7, wherein: There are one or more positioning members. When there are multiple positioning members, the positioning members are symmetrically or spaced apart along the circumference of the sand core.

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