A cooling tool for large planar castings

Abstract

The application relates to a cooling tool for a large-plane casting, which comprises a first cold mold plate, a second cold mold plate, a first sand-coated layer, a second sand-coated layer and a clamping assembly, the first sand-coated layer is arranged on the first cold mold plate, the second sand-coated layer is arranged on the second cold mold plate; one end of the second cold mold plate is connected to the first cold mold plate, one key surface of the sand core is arranged on the first sand-coated layer, and the other key surface is close to the second sand-coated layer; and the clamping assembly connects the sand core and the first cold mold plate and the second cold mold plate into an integrated whole. The cooling tool for the large-plane casting disclosed by the application replaces the traditional casting method using cold iron for cooling, avoids the unstable casting quality caused by uncontrollable factors such as the quality of the cold iron and the setting quality of the cold iron, forms a casting cooling surface through the sand-coated cold mold plate, plays a forced accelerated cooling role on the large-plane part of the casting, and effectively improves the casting quality and stability.

Description

Technical Field

[0001] This invention relates to the field of casting technology, and in particular to a cooling fixture for large flat castings. Background Technology

[0002] For planar fully machined castings, especially planar structural castings made of mixed matrix materials such as gray cast iron and ductile iron, there are many product types, complex planar structures, and high casting quality requirements. The planar surfaces need to be machined with T-slots, oil passages, etc.

[0003] Flat castings are prone to defects such as slag inclusions, discoloration, and unsuitable properties at their flat surfaces. Traditional casting methods often address these issues by tilting the pour and placing a large number of chills on the flat surface. However, while this improves the casting quality at the flat surface, it also leads to problems such as inconsistent chill quality, inaccurate placement, and difficulty in chill placement, resulting in inconsistent casting quality. Furthermore, the complex planar structure of the casting results in a high sand-to-iron ratio and low production efficiency. Summary of the Invention

[0004] Therefore, it is necessary to provide a cooling fixture for large flat castings that does not require chills, provides stable casting quality, and effectively reduces the casting sand-to-iron ratio, in order to address the aforementioned technical problems.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] This invention discloses a cooling fixture for a large flat casting. The large flat casting is made by sand core casting. The sand core includes two key surfaces. The cooling fixture includes a first cold forming plate, a second cold forming plate, a first sand coating layer, a second sand coating layer, and a clamping assembly. The first sand coating layer is disposed on the first cold forming plate, and the second sand coating layer is disposed on the second cold forming plate. The second cold forming plate is connected to one end of the first cold forming plate. One key surface of the sand core is disposed on the first sand coating layer, and the other key surface is close to the second sand coating layer. The clamping assembly connects the sand core, the first cold forming plate, and the second cold forming plate into one unit.

[0007] In one embodiment, the second cold-formed sheet includes a main body and a connecting part that is perpendicularly fixed to the main body, and one end of the connecting part away from the main body is connected to the first cold-formed sheet via a first connector.

[0008] In one embodiment, the mounting assembly includes a first mounting member and a first connecting rod. A plurality of the first mounting members are disposed on the side of the sand core away from the first cold forming plate, and each of the first mounting members is connected to the first cold forming plate at both ends by a first connecting rod.

[0009] In one embodiment, the mounting assembly further includes a second mounting member and a second connecting rod. A plurality of the second mounting members are disposed on the side of the sand core away from the second cold forming plate, and each of the two ends of the second mounting member is connected to the second cold forming plate by a second connecting rod.

[0010] In one embodiment, the first cold-formed plate and / or the second cold-formed plate are provided with a plurality of sand-fixing grooves on the side facing the sand core.

[0011] In one embodiment, the thickness of the first sand coating layer and / or the second sand coating layer is 15 mm to 20 mm.

[0012] In one embodiment, the first cold-formed plate and / or the second cold-formed plate are provided with a reinforcing member on the side opposite to the sand core.

[0013] In one embodiment, the key surface is provided with a sand filling groove and / or a mud strip groove.

[0014] In one embodiment, the casting wall thickness formed by the key surface is a, and the thickness of the first cold-formed plate and / or the second cold-formed plate is >2a.

[0015] The technical solution adopted in this invention can achieve the following beneficial effects:

[0016] This invention discloses a cooling fixture for large-flat castings, replacing the traditional, cumbersome method of using chills for cooling. It avoids casting quality instability caused by uncontrollable factors such as chill quality and its placement. By forming a cooling surface on a sand-coated cooling mold plate, it provides forced accelerated cooling to the large flat areas of the casting, effectively improving casting quality and casting stability. This invention also effectively reduces the casting sand-to-iron ratio, allowing the use of only one sand core and eliminating the need for a sand box, thus omitting the core assembly and box assembly processes. This significantly optimizes casting costs, quality, and efficiency. Attached Figure Description

[0017] Figure 1 The cooling fixture for the large flat casting disclosed in the embodiments of the present invention;

[0018] Figure 2 This is an assembly diagram of the first cold-formed sheet and the second cold-formed sheet;

[0019] Figure 3 This is a structural schematic diagram of the first cold-formed sheet;

[0020] Figure 4 This is a schematic diagram of the structure of the second cold-formed plate.

[0021] Explanation of reference numerals in the attached figures:

[0022] 100 - First cold-rolled sheet; 110 - First sand coating layer;

[0023] 200 - Second cold-formed sheet, 210 - Second sand coating layer, 220 - Connecting part, 230 - Main body part;

[0024] 300-sand core;

[0025] 410 - Channel steel, 420 - Screw;

[0026] 500-bolt. Detailed Implementation

[0027] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0028] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," "top," "bottom," "end," "top," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] This invention discloses a cooling fixture for large planar castings, applicable to sand core casting of castings with two critical planes. The sand core can be a single, integrally formed sand core, for example, printed entirely using 3D printing. This optimizes the modeling scheme from multiple sand cores and molds to a single, highly efficient modeling scheme. Correspondingly, this sand core also has two critical planes, which are perpendicular to each other in this embodiment.

[0031] like Figures 1 to 4As shown, the cooling fixture for the large flat casting disclosed in this embodiment includes a first cold mold plate 100, a second cold mold plate 200, and a clamping assembly. The second cold mold plate 200 can be vertically disposed at one end of the first cold mold plate 100 to form a cooling structure. The clamping assembly is used to fix the sand core 300 to the cooling structure. The first cold mold plate 100 acts on one of the key surfaces of the sand core 300, and the second cold mold plate 200 acts on the other key surface. During the pouring process, both key surfaces of the sand core 300 are cooled, further cooling the molten metal in the cavity located on these two key surfaces. This improves the quality of the two key surfaces of the casting without the need for a large number of chills.

[0032] Furthermore, the cooling fixture for the large flat casting disclosed in this embodiment may also include a first sand coating layer 110 and a second sand coating layer 210. The first sand coating layer 110 is disposed between the sand core 300 and the first cold forming plate 100 to avoid direct contact between the sand core 300 and the first cold forming plate 100, which would cause the casting to cool rapidly. The second sand coating layer 210 is disposed between the sand core 300 and the second cold forming plate 200 to avoid direct contact between the sand core 300 and the second cold forming plate 200, which would cause the casting to cool rapidly.

[0033] Preferably, both the first cold-formed plate 100 and the second cold-formed plate 200 can be provided with a plurality of cross-distributed sand-fixing grooves on the side facing the sand core 300. Resin sand is filled into the sand-fixing grooves and a sand layer of a certain thickness is piled up, leveled, compacted, and cured to form a first sand-coated layer 110 on the first cold-formed plate 100 and a second sand-coated layer 210 on the second cold-formed plate 200. The thickness of the sand layer is preferably 15mm to 20mm.

[0034] Furthermore, both the first cold-formed plate 100 and the second cold-formed plate 200 can be provided with several cross-distributed reinforcing members on the side opposite to the sand core 300.

[0035] In the embodiments disclosed in this invention, the second cold-formed plate 200 includes a main body 230 and a connecting part 220. The main body 230 is used to cool the sand core 300, and a second sand coating layer 210 is disposed thereon. The connecting part 220 is used to connect the first cold-formed plate 100, and is arranged perpendicularly to the main body 230. The two can be welded together or integrally formed. A plurality of U-shaped holes are provided at one end of the connecting part 220 away from the main body 230. A plurality of corresponding U-shaped holes are also provided at one end of the first cold-formed plate 100. Bolts 500 pass through the U-shaped holes of the first cold-formed plate 100 and the U-shaped holes of the connecting part 220 in sequence and are then tightened by nuts. Preferably, a washer can be provided between the nut and the connecting part 220.

[0036] In the embodiments disclosed in this invention, the mounting assembly may include a plurality of longitudinal mounting members for fixing the sand core 300 to the first cold-formed plate 100 and a plurality of transverse mounting members for fixing the sand core 300 to the second cold-formed plate 200. Specifically, the longitudinal mounting members may include a channel steel 410 and two screws 420 respectively connected to both ends of the channel steel 410. U-shaped holes are provided on both sides of the first cold-formed plate 100. The ends of the two screws 420 facing away from the channel steel 410 pass through the U-shaped holes on both sides of the first cold-formed plate 100 and are fastened with nuts. Similarly, the structure of the transverse mounting members may be the same as or similar to the structure of the longitudinal mounting members, and will not be described in detail in this embodiment.

[0037] In the embodiments disclosed in this invention, based on the casting and the structure of the sand core 300, sand filling grooves and / or clay strip grooves can be provided on both key surfaces of the sand core 300. After the sand core 300 is fixed in the cooling structure using a mounting assembly, sand can be filled in the sand filling grooves and clay strips can be sealed in the clay strip grooves to prevent the casting from catching fire during the pouring process.

[0038] In the embodiments disclosed in this invention, the wall thickness at the critical plane of the casting is a, then the thickness of the first cold forming plate 100 or the second cold forming plate 200 acting on that plane is greater than 2a. Preferably, the first cold forming plate 100 and / or the second cold forming plate 200 are made of cast iron.

[0039] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A cooling fixture for a large planar casting, wherein the large planar casting is sand-core cast, and the sand core includes two key surfaces, characterized in that, The sand core is a single, integrally formed sand core, which is printed as a whole using 3D printing. The cooling fixture includes a first cold-formed plate, a second cold-formed plate, a first sand coating layer, a second sand coating layer, and a clamping assembly. The first sand coating layer is disposed on the first cold-formed plate, and the second sand coating layer is disposed on the second cold-formed plate. Both the first cold-formed plate and the second cold-formed plate have several sand-fixing grooves on the side facing the sand core. Resin sand is filled into the sand-fixing grooves and piled up to form a sand layer. After being scraped, compacted, and cured, the first sand coating layer is formed on the first cold-formed plate, and the second sand coating layer is formed on the second cold-formed plate. The second cold-formed plate is connected to one end of the first cold-formed plate. One key surface of the sand core is disposed on the first sand coating layer, and the other key surface is close to the second sand coating layer. The mounting assembly connects the sand core, the first cold-formed plate, and the second cold-formed plate into one unit. The second cold-formed sheet includes a main body and a connecting part that is perpendicularly fixed to the main body. One end of the connecting part away from the main body is connected to the first cold-formed sheet via a connector. The mounting assembly includes a first mounting component and a first connecting rod. A plurality of the first mounting components are disposed on the side of the sand core away from the first cold forming plate, and each of the two ends of the first mounting component is connected to the first cold forming plate by a first connecting rod. The mounting assembly further includes a second mounting component and a second connecting rod. A plurality of the second mounting components are disposed on the side of the sand core away from the second cold forming plate, and each of the two ends of the second mounting component is connected to the second cold forming plate by a second connecting rod.

2. The cooling fixture for large planar castings according to claim 1, characterized in that, The thickness of the first sand coating layer and / or the second sand coating layer is 15mm to 20mm.

3. The cooling fixture for large planar castings according to claim 1, characterized in that, The first cold-formed plate and / or the second cold-formed plate are provided with a reinforcing member on the side away from the sand core.

4. The cooling fixture for large planar castings according to claim 1, characterized in that, The key surface is provided with a sand filling groove and / or a mud strip groove.

5. The cooling fixture for a large flat casting according to any one of claims 1-4, characterized in that, The wall thickness of the casting formed by the key surface is a, and the thickness of the first cold-formed plate and / or the second cold-formed plate is >2a.

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