Integral cold iron sand core device for forming inner hole part
By designing an integral cold iron sand core device, combining cylindrical cold iron and sand core, and using sand hanging protrusions and reinforced plate structures, the waste and quality problems of traditional cold iron design are solved, and the efficiency and quality improvement of the casting process is achieved.
Patent Information
- Application Number
- CN202411378043.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-01-03
AI Technical Summary
The traditional bearing hole sand core cold iron design has the problem of large amount of cold iron, wasting manpower and material resources, and affecting the surface quality of the castings. Especially in mass production, the supply is insufficient and it is difficult to control the surface quality, and it is prone to oil stains, rust spots or pore defects.
Design an integral cold iron sand core device, adopting a cylindrical cold iron body and sand core, the outer surface of the cold iron is equipped with a sand-hanging protruding structure on the side and end surfaces, and an annular and flat rib plate is installed in the inner cavity, using QT400-15 The material is molded by disappearing mold casting to form a sand-separated cold iron structure to reduce the amount of cold iron and the amount of resin sand.
This solution reduces the manpower and material costs of the casting workshop, improves the quality of the inner wall of the part hole, reduces the incidence of pore defects, and achieves the reusable use of cold iron and guarantees the production quality.
Smart Images
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Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of casting production, and in particular relates to an integral cold iron sand core device for forming inner hole parts. 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 the riser system to improve the shrinkage feeding channel and control the solidification sequence of the casting. It can also accelerate the solidification speed of the thick iron liquid around the hole, refine the grain structure, and improve the mechanical properties of the bearing seat.
[0003] Traditional bearing hole sand core chillers consider the hole diameter and height, and design a separate rectangular chiller to be placed along the hole wall. Due to the difference in the size of the bearing holes of various types of wind turbine bearing seats, the number of chillers is about 20-40 pieces, which causes great losses in manpower and material costs in the foundry workshop. In addition, if batch production is put into production, the chiller is used more, the supply is not in time or the surface quality cannot be effectively controlled, and there are oil stains, rust spots or other defects. In addition, due to the structural reasons of the bearing seat itself, the exhaust is not smooth, which easily produces pore defects in the bearing hole.
[0004] Based on the above reasons, it is necessary to improve the sand core cold iron structure. Summary of the invention
[0005] The technical problem solved by the present invention is to provide an integral cold iron sand core device for forming inner hole parts. The present invention designs a cold iron sand core structure to solve the problem that the number of cold irons in the inner hole sand core 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 object, the technical solution adopted by the present invention is:
[0007] An integral chilled iron sand core device for forming inner hole parts comprises a sand core, wherein an integral chilled iron is arranged in the cylindrical inner cavity of the sand core, and the integral chilled iron comprises a cylindrical chilled iron body, wherein the cylindrical outer surface of the cylindrical chilled iron body fits tightly with 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 cold iron body.
[0010] Furthermore, the side sand hanging protrusion I is a cylindrical T-shaped boss structure.
[0011] Wherein, the bottom end of the cylindrical cold iron body is closed, and a plurality of end surface sand hanging protrusions II are arranged on the outer surface of the bottom end of the cylindrical cold iron body.
[0012] Furthermore, the end surface 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] Furthermore, the integral chiller is formed by lost foam casting using QT400-15 material.
[0017] The advantages of the present invention compared with the prior art are:
[0018] 1. This scheme is suitable for the casting production of cylindrical hole parts with large size and thick wall. 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. Since 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 chilling effect of the chill on the molten iron in the cavity and the production quality. In addition, the chill can be reused in small quantities, which greatly saves the manpower and material costs of the foundry workshop.
[0019] 2. This scheme considers the influence of sand core chiller on the shrinkage of castings and reasonably designs the machining allowance of castings. The amount of resin sand can be greatly reduced during the molding process 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
[0020] Figure 1 It is a schematic diagram of the structure of the sand core and the integral chiller of the present invention after being combined;
[0021] Figure 2 It is a schematic diagram of the cross-section structure of the integral chiller in the present invention;
[0022] Figure 3 It is a schematic diagram of the bottom structure of the integral chiller in the present invention;
[0023] Figure 4 It is a schematic diagram of the upper structure of the integral cold iron in the present invention. DETAILED DESCRIPTION
[0024] 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 described embodiments 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 creative work are within the scope of protection of the present invention.
[0025] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.
[0026] See also Figure 1-4 , details of the embodiments of the present invention.
[0027] Example 1: See Figure 1 As shown, an integral chilled iron sand core device for forming inner hole parts includes a sand core 2, an integral chilled iron 1 is arranged in the cylindrical inner cavity of the sand core 2, and the integral chilled iron 1 includes a cylindrical chilled iron body 1-1, and the cylindrical outer surface of the cylindrical chilled iron body 1-1 fits tightly with the cylindrical inner cavity surface of the sand core 2. This structure allows the sand core to be coated on the outside of the integral chilled iron, thereby forming a sand-insulated chilled iron structure.
[0028] 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, thereby 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.
[0029] In a specific embodiment: a plurality of side sand-hanging protrusions Ⅰ1-2 are provided on the cylindrical outer surface of the cylindrical cold iron body 1-1.
[0030] 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.
[0031] Preferably, the plurality of side sand-hanging protrusions Ⅰ1-2 are evenly distributed horizontally and vertically on the cylindrical outer surface of the cylindrical cold iron body 1-1. Preferably, the side sand-hanging protrusions Ⅰ1-2 are cylindrical T-shaped boss structures.
[0032] 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.
[0033] In a specific embodiment: the bottom end of the cylindrical cold iron 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 cold iron body 1-1.
[0034] 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.
[0035] Preferably, the end face sand hanging protrusion II1-3 is a cylindrical T-shaped boss structure.
[0036] 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 limited connection, and the two are not easy to be separated, further improving the connection strength.
[0037] In a specific embodiment: 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.
[0038] 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.
[0039] In a specific embodiment: a bottom surface of the cylindrical chiller body 1-1 is provided with a chiller bottom surface 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 plate 1-5.
[0040] 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, making the operation convenient and simple.
[0041] In a specific implementation manner: the integral chiller 1 is formed by lost foam casting using QT400-15 material.
[0042] Example 2: This example takes a certain type of wind turbine bearing seat casting as an example. The bearing hole diameter of this type of bearing seat casting is 1400mm and the height is 533mm. The integral cold iron structure made according to the 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-insulated chiller is formed by lost foam casting and the material is QT400-15.
[0043] By using the integrated chiller and sand core to produce a total of 20 wind turbine bearing seats, nearly 500 rectangular chillers were saved during the molding process. Compared with the traditional method, each bearing hole sand core reduced the use of nearly 2 / 3 of the resin sand, greatly reducing the cost of manpower and material resources. In addition, the pore defect in the bearing hole was completely solved (the pore incidence rate of the bearing seat under the existing technology was 57.78%), thus effectively ensuring the product quality.
[0044] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.
[0045] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description 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 modes that can be understood by those skilled in the art.
Claims
1. An integral cold iron sand core device for forming inner hole parts, comprising a sand core (2), characterized in that: An integral chiller (1) is arranged in the cylindrical inner cavity of the sand core (2), and the integral chiller (1) comprises a cylindrical chiller body (1-1), and the cylindrical outer surface of the cylindrical chiller body (1-1) fits tightly with the cylindrical inner cavity surface of the sand core (2); the integral chiller (1) is formed by lost foam casting using QT400-15 material.
2. The integral cold iron sand core device for forming inner hole 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 cold iron sand core device for forming inner hole parts according to claim 2, characterized in that: The 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 cold iron sand core device for forming inner hole 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 cold iron sand core device for forming inner hole parts 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 cold iron sand core device for forming inner hole parts 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 cold iron sand core device for forming inner hole parts 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 cold iron sand core device for forming inner hole parts 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 cold iron sand core device for forming inner hole parts 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).