Integral cold iron sand core device for forming inner hole of cylindrical casting part

Abstract

The utility model provides an integral cold iron sand core device for forming an inner hole of a cylindrical casting part, and belongs to the technical field of casting production. Comprising a sand core, an integral chilling block is arranged in a cylindrical inner cavity of the sand core, the integral chilling block comprises a cylindrical chilling block body, and the cylindrical outer surface of the cylindrical chilling block body is attached to the surface of the cylindrical inner cavity of the sand core in a matched mode. The sand core chilling block structure is designed according to the hole size and shape of the cylindrical part, the outer contour shape of the chilling block is similar to the inner hole shape of the cylindrical part, the chilling block is cylindrical, the sand core wraps the chilling block, the chilling block does not make direct contact with molten iron in the pouring process, the chilling effect of the chilling block on the molten iron in a cavity is guaranteed, production quality is guaranteed, and production efficiency is improved. And the integral chilling block can be repeatedly used, the number is small, and the manpower and material resource cost of a casting workshop is greatly saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of casting production, and particularly relates to an integral cold iron sand core device for forming the inner hole of a cylindrical casting part. Background Art

[0002] For cylindrical parts such as wind turbine bearing seats, a circle of chilled iron is generally designed in the sand core of the bearing hole during the casting process. It is used to cooperate with the pouring system and riser system to improve the shrinkage feeding channel and control the solidification sequence of the casting. It can also accelerate the solidification rate of the thick iron liquid around the hole, refine the grain structure, and improve the mechanical properties of the bearing seat.

[0003] Traditional sand core chillers for bearing holes are designed to take into account the hole diameter and height, with individual rectangular chillers placed in a circle along the hole wall. Due to the varying sizes of bearing holes in various wind turbine bearing housings, the number of chillers ranges from 20 to 40, resulting in significant losses in labor and material costs for the foundry. Furthermore, during mass production, excessive chiller use, insufficient supply, and ineffective surface quality control can lead to oil stains, rust, and other defects. Furthermore, due to the structural limitations of the bearing housing itself, air ventilation is impeded, which can easily lead to porosity defects within the bearing hole.

[0004] Based on the above reasons, it is necessary to improve the sand core chiller structure. Utility Model Content

[0005] The technical problem solved by the utility model is to provide an integral cold iron sand core device for inner hole forming of cylindrical casting parts. The utility model designs a cold iron sand core structure to solve the problem that the number of cold irons in the sand core of the inner hole of cylindrical parts is large, which wastes manpower and material resources and affects the surface quality of the casting.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by this utility model is:

[0007] An integral chill sand core device for forming the inner hole of a cylindrical casting part includes a sand core, wherein an integral chill is provided in the cylindrical inner cavity of the sand core. The integral chill includes a cylindrical chill body, and the cylindrical outer surface of the cylindrical chill body fits tightly against the cylindrical inner cavity surface of the sand core.

[0008] Wherein, a plurality of side sand hanging protrusions I are provided on the cylindrical outer surface of the cylindrical cold iron body.

[0009] Furthermore, the plurality of side sand-hanging protrusions I are evenly distributed on the cylindrical outer surface of the cylindrical chiller body.

[0010] Furthermore, the side sand hanging protrusion I is a cylindrical T-shaped boss structure.

[0011] The bottom end of the cylindrical cold iron body is closed, and a plurality of end face sand hanging protrusions II are provided on the outer surface of the bottom end of the cylindrical cold iron body.

[0012] Furthermore, the end face sand hanging protrusion II is a cylindrical T-shaped boss structure.

[0013] Furthermore, a chiller bottom surface hanging ring is provided on the outer surface of the bottom end of the cylindrical chiller body.

[0014] Among them, the interior of the cylindrical cold iron body is a cold iron cylindrical inner cavity, and an annular rib plate and a flat rib plate are provided inside the cold iron cylindrical inner cavity. The annular rib plate is coaxially arranged with the cold iron cylindrical inner cavity, and the flat rib plate is radially arranged along the cold iron cylindrical inner cavity and cross-connected with the annular rib plate and the inner wall of the cold iron cylindrical inner cavity.

[0015] Furthermore, a chiller upper hanging ring is provided on the cylindrical chiller body, and the chiller upper hanging ring is made on the annular rib plate.

[0016] The advantages of this utility model compared with the prior art are:

[0017] 1. This solution is suitable for the casting production of parts with large-sized, thick-walled cylindrical holes. The sand core chill is designed according to the size and shape of the cylindrical part hole. The outer contour of the chill is similar to the inner hole shape of the cylindrical part, which is cylindrical. Because the sand core is coated on the outside of the chill to form a sand-insulating chill, the chill does not directly contact the molten iron during the pouring process, ensuring the chill's cooling effect on the molten iron in the mold cavity and ensuring production quality. In addition, the chill can be reused and the quantity is small, which greatly saves manpower and material costs in the foundry workshop.

[0018] 2. In this scheme, the influence of sand core chill on the shrinkage of castings is taken into consideration and the casting processing allowance is reasonably designed. The amount of resin sand used in the molding process can be greatly reduced and can be reused. It is not only economical but also beneficial to improve the quality of the inner wall of the part hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the sand core and the integral chiller of the present invention;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the integral chiller in the present invention;

[0021] Figure 3 This is a schematic diagram of the bottom structure of the integral chiller in the present invention;

[0022] Figure 4 This is a schematic diagram of the upper structure of the integral chiller in the present invention. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying 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.

[0024] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0025] See also Figure 1-4 , describe in detail the embodiments of the present utility model.

[0026] Example 1: See Figure 1 As shown, the integral chill sand core device for forming the inner hole of a cylindrical casting part includes a sand core 2. An integral chill 1 is disposed within the cylindrical inner cavity of the sand core 2. The integral chill 1 includes a cylindrical chill body 1-1, the cylindrical outer surface of the cylindrical chill body 1-1 being adapted to fit snugly within the cylindrical inner cavity of the sand core 2. This structure allows the sand core to be encased within the integral chill, forming a sand-insulated chill structure.

[0027] In this embodiment, the sand core chill is designed according to the hole size and shape. The outer contour of the integral chill is similar to the inner hole shape of the cylindrical part, and is cylindrical. The outside of the integral chill is covered with a sand core made of molding sand. During the pouring process, the chill is not in direct contact with the molten iron, ensuring the chilling effect of the chill on the molten iron in the mold cavity and the production quality. Moreover, the chill can be reused in small quantities, which greatly saves the manpower and material costs of the foundry workshop.

[0028] In a specific embodiment: a plurality of side sand-hanging protrusions Ⅰ1-2 are provided on the cylindrical outer surface of the cylindrical chiller body 1-1.

[0029] In the above structure, the protruding structure is used to hang the molding sand on the inner wall of the external sand core, so that the connection between the integral chiller and the sand core is firm and reliable.

[0030] Preferably, the plurality of side sand-hanging protrusions Ⅰ1-2 are evenly distributed horizontally and vertically on the cylindrical outer surface of the cylindrical chill body 1-1. Preferably, the side sand-hanging protrusions Ⅰ1-2 are cylindrical T-shaped boss structures.

[0031] The above structure makes the manufacturing and processing of the protrusion more convenient, and the connection between the T-shaped boss structure and the sand core forms a nested limiting connection, the two are not easy to be separated, and the connection strength is improved.

[0032] In a specific embodiment: the bottom end of the cylindrical chiller body 1-1 is closed, and a plurality of end surface sand-hanging protrusions II1-3 are provided on the outer surface of the bottom end of the cylindrical chiller body 1-1.

[0033] In the above structure, the protruding structure is used to hang the molding sand on the bottom surface of the external sand core, so that the connection between the integral chiller and the sand core is more firm and reliable.

[0034] Preferably, the end face sand hanging protrusion II1-3 is a cylindrical T-shaped boss structure.

[0035] The above structure makes the protrusion manufacturing and processing more convenient, and the connection between the T-shaped boss structure and the sand core forms a nested limit connection, which makes the two difficult to disengage, further improving the connection strength.

[0036] In a specific embodiment: the interior of the cylindrical chiller body 1-1 is a chiller cylindrical inner cavity 1-4, and an annular rib plate 1-5 and a flat rib plate 1-6 are provided inside the chiller cylindrical inner cavity 1-4. The annular rib plate 1-5 is coaxially arranged with the chiller cylindrical inner cavity 1-4, and the flat rib plate 1-6 is radially arranged along the chiller cylindrical inner cavity 1-4 and cross-connected with the annular rib plate 1-5 and the inner wall of the chiller cylindrical inner cavity 1-4.

[0037] The above structure reinforces the structure of the chiller by arranging ribs of different structures and directions in the inner cavity of the chiller, thereby preventing the chiller from deforming, ensuring the use effect of the chiller, and then ensuring the quality of the produced products.

[0038] In one embodiment, a bottom surface of the cylindrical chiller body 1-1 is provided with a chiller bottom hanging ring 1-8. A top surface of the cylindrical chiller body 1-1 is provided with a chiller top hanging ring 1-7, and the chiller top hanging ring 1-7 is made on the annular rib 1-5.

[0039] In the above structure, by arranging lifting rings on the upper and lower sides of the cylindrical chiller, the flexibility of lifting the large chiller is improved, and the operation is convenient and simple.

[0040] In a specific embodiment, the integral chiller 1 is formed by lost foam casting using QT400-15 material.

[0041] Example 2: This example takes a certain type of wind turbine bearing seat casting as an example. The diameter of the bearing hole of this type of bearing seat casting is 1400mm and the height is 533mm. The integral cold iron structure made according to this wind turbine bearing seat is as follows: Figure 2-4As shown, the size of the integral chiller is designed according to the bearing hole size of the bearing seat, so that the outer contour size of the chiller is 1430×565mm; the sand-insulating chiller is formed by lost foam casting and the material is QT400-15.

[0042] By using this integrated chiller and sand core in the production of 20 wind turbine bearing seats, nearly 500 rectangular chillers were saved during the molding process. Compared to traditional methods, each bearing hole sand core uses nearly two-thirds less resin sand, significantly reducing labor and material costs. Furthermore, the previously existing porosity defect in the bearing holes (the porosity rate in bearing seats with existing technology was 57.78%) was completely eliminated, effectively ensuring product quality.

[0043] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0044] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An integral cold iron sand core device for forming the inner hole of a cylindrical casting part, comprising a sand core (2), characterized in that: An integral chill (1) is provided in the cylindrical inner cavity of the sand core (2), and the integral chill (1) comprises a cylindrical chill body (1-1), and the cylindrical outer surface of the cylindrical chill body (1-1) fits tightly against the cylindrical inner cavity surface of the sand core (2).

2. The integral chilled iron sand core device for inner hole forming of cylindrical casting parts according to claim 1, characterized in that: A plurality of side sand-hanging protrusions I (1-2) are provided on the cylindrical outer surface of the cylindrical cold iron body (1-1).

3. The integral chilled iron sand core device for forming the inner hole of a cylindrical casting part according to claim 2, characterized in that: A plurality of side sand-hanging protrusions I (1-2) are evenly distributed on the cylindrical outer surface of the cylindrical cold iron body (1-1).

4. The integral chilled iron sand core device for inner hole forming of cylindrical casting parts according to claim 3, characterized in that: The side sand-hanging protrusion I (1-2) is a cylindrical T-shaped boss structure.

5. The integral chilled iron sand core device for forming the inner hole of a cylindrical casting part according to claim 1, characterized in that: The bottom end of the cylindrical cold iron body (1-1) is closed, and a plurality of end surface sand-hanging protrusions II (1-3) are provided on the outer surface of the bottom end of the cylindrical cold iron body (1-1).

6. The integral chilled iron sand core device for forming the inner hole of a cylindrical casting part according to claim 5, characterized in that: The end surface sand hanging protrusion II (1-3) is a cylindrical T-shaped boss structure.

7. The integral chilled iron sand core device for forming the inner hole of a cylindrical casting part according to claim 5, characterized in that: A chiller bottom surface hanging ring (1-8) is provided on the outer surface of the bottom end of the cylindrical chiller body (1-1).

8. The integral chilled iron sand core device for forming the inner hole of a cylindrical casting part according to claim 1, characterized in that: The interior of the cylindrical cold iron body (1-1) is a cold iron cylindrical inner cavity (1-4), and an annular rib plate (1-5) and a flat rib plate (1-6) are provided inside the cold iron cylindrical inner cavity (1-4). The annular rib plate (1-5) is coaxially arranged with the cold iron cylindrical inner cavity (1-4), and the flat rib plate (1-6) is radially arranged along the cold iron cylindrical inner cavity (1-4) and cross-connected with the annular rib plate (1-5) and the inner wall of the cold iron cylindrical inner cavity (1-4).

9. The integral chilled iron sand core device for forming the inner hole of a cylindrical casting part according to claim 8, characterized in that: A chiller upper hanging ring (1-7) is provided on the cylindrical chiller body (1-1), and the chiller upper hanging ring (1-7) is made on the annular rib plate (1-5).

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