Mould kit for casting castings by using pre-buried sand core

Abstract

The utility model discloses a mold suite for casting a casting by using a pre-buried sand core, which comprises an original casting, a lower mold, an upper mold, a forming casting and the pre-buried sand core, the original casting comprises a first protruding part and a second protruding part, the first protruding part is located below the second protruding part, and the outer contour of the first protruding part is larger than that of the second protruding part; the formed casting is not provided with a second protruding part, and other structures are the same as those of the original casting; the pre-embedded sand core is provided with a groove corresponding to the second protruding part, and after the pre-embedded sand core is placed on the formed casting, the pre-embedded sand core does not exceed the outer contour of the formed casting. The device can be directly used in the existing field, and auxiliary machinery is not required to be added. According to the utility model, sand mould modeling of castings which cannot be drawn out can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of casting molds, in particular to a mold kit for casting castings by using pre-buried sand cores. Background Art

[0002] In sand casting, for locations where it is difficult or impossible to demold the casting, more parting surfaces are usually used, the draft angle is adjusted, and machining allowances are set to handle them. Doing so will prolong the processing process and reduce the production efficiency of the casting. Sometimes, the above methods cannot be used for casting due to the limitations of the production site.

[0003] Research on the demolding problem by those skilled in the art has mostly focused on the problem of draft angle. For example, announcement number: CN110026530B discloses a method for demolding a casting model, wherein a thin sheet is attached to the outer surface of the model, and the model and the thin sheet are placed together in a sand box. After sandblasting and shaping, the model is pulled out; the thin sheet is a lost foam sheet, and the lost foam sheet is fixed to the model by nails; when the model is pulled out, the lost foam sheet is separated from the model, and the model and the nails are pulled out together, and the nails on the model scratch the lost foam sheet. The demolding method provided by the present invention can smoothly separate the model from the sand mold when the model draft angle is small, or when no draft angle is required, and the model is buried deep in the sand and cannot be demolded.

[0004] For example, announcement number: CN210702362U discloses a near-net-shape, oversized, non-draft-free, non-drop-out casting mold. This mold does not use a draft angle, while ensuring the accuracy of the outer contour dimensions, it prevents the problem of overweight castings caused by the draft setting of the mold, and achieves near-net-shape of oversized castings.

[0005] Therefore, a new type of mold is needed to solve the molding problem of the position on the casting that cannot be demolded on the existing production site. Utility Model Content

[0006] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to provide a mold kit for casting castings using pre-embedded sand cores.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A mold kit for casting castings using embedded sand cores, comprising an original casting, a lower mold, an upper mold, a forming casting, and an embedded sand core; the original casting comprises a first protrusion and a second protrusion, the first protrusion being located below the second protrusion, and the outer contour of the first protrusion being larger than that of the second protrusion; the forming casting does not have the second protrusion, and the remaining structure is the same as the original casting; the embedded sand core is provided with a groove corresponding to the second protrusion, and after the embedded sand core is placed on the forming casting, the embedded sand core does not extend beyond the outer contour of the forming casting.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] 1. The utility model can be used directly in existing sites without adding auxiliary machinery.

[0011] 2. The utility model can realize sand mold molding of castings that cannot be demolded. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The utility model is a structural schematic diagram of a mold kit for casting castings using pre-embedded sand cores.

[0013] In the figure: 1. Original casting; 2. Molded casting; 3. Embedded sand core; 4. Ordinary sand core; 5. Demolding direction; 6. Second protrusion; 7. First protrusion. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0015] See also Figure 1 The utility model provides a mold kit for casting castings using embedded sand cores, comprising an original casting 1, a forming casting 2, an embedded sand core 3, a lower mold, and an upper mold.

[0016] The original casting 1 includes a first protrusion 7 and a second protrusion 6. The first protrusion 7 is located below the second protrusion 6. The outer contour of the first protrusion 7 is larger than that of the second protrusion 6. When the sand core is formed, the second protrusion 6 is difficult to be demolded.

[0017] The ordinary sand core 4 is obtained by separately shaping the second protruding portion 6 of the original casting 1 , and the portion of the ordinary sand core 4 located outside the original casting 1 is eliminated to obtain the embedded sand core 3 .

[0018] The molded casting 2 does not have the second protrusion 6 , and the remaining structure is the same as the original casting 1 . The absence of the second protrusion 6 allows the upper mold to be smoothly demolded after the sand core is formed.

[0019] The first protruding portion 7 and the second protruding portion 6 may be convex ring structures or convex block structures, and there may be multiple second protruding portions 6 , which are respectively shaped to obtain multiple embedded sand cores 3 .

[0020] During specific use, the original casting 1 is first used to form a pre-embedded sand core 3. The pre-embedded sand core 3 contains a groove structure corresponding to the second protrusion 6. Sand is filled in the lower mold and the upper mold. The molded casting 2 is placed in the lower mold. The pre-embedded sand core 3 is placed at the corresponding position of the molded casting 2 and the original casting 1. The upper mold is installed, and casting auxiliary parts such as the gate and riser are installed. The sand core is compacted and hardened, and the mold is pulled upward to separate. The pre-embedded sand core 3 is separated from the upper mold together, the molded casting 2 is removed, and the mold is closed for casting.

[0021] The provision of the embedded sand core 3 reduces the difficulty of demoulding and does not require additional production equipment.

[0022] All components not discussed in detail in this application and the connection methods of the components in this application are well-known technologies in the technical field and can be directly applied without further explanation.

[0023] In this utility model, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean fixed, removable, or integral; "connected" can mean directly or indirectly through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0024] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0025] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0026] The above description is merely a preferred embodiment of the present invention and is 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 mold kit for casting castings using pre-embedded sand cores, comprising an original casting, a lower mold, and an upper mold, characterized in that: It also includes molded castings and embedded sand cores; The original casting comprises a first protrusion and a second protrusion, wherein the first protrusion is located below the second protrusion, and the outer contour of the first protrusion is larger than that of the second protrusion; The molded casting does not have a second protruding portion, and the remaining structure is the same as the original casting; The embedded sand core is provided with a groove corresponding to the second protrusion. After the embedded sand core is placed on the molded casting, the embedded sand core does not exceed the outer contour of the molded casting.

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