A casting mold and method for a lower support plate of a spherical steel support of a span continuous beam

Abstract

The application provides a casting mold and method for a lower support plate of a span continuous beam spherical steel support, which comprises a bottom plate-shaped part, a middle plate-shaped part and a top cylindrical part arranged in sequence from bottom to top, the side surfaces of the top cylindrical part and the middle plate-shaped part are formed by chromite sand compaction, and the outer surfaces are brushed with cast steel paint; the middle plate-shaped part is used as a processing reference plane on the bottom plate-shaped part during processing; the four corners of the two side surfaces contacted by the guide strip and the bottom surface have a small height and a large depth, so that sand formation is avoided in the space during the casting process, the cleaning difficulty of the casting is reduced, the processing time and difficulty are reduced, the cost is saved, and the work efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of casting technology for spherical bearings of railway bridges, specifically relating to a casting mold and method for the lower support plate of a spherical steel bearing for a continuous span beam. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Currently, railway mileage development is still in an upward phase, and the demand for bridge bearings is very large. The spherical steel bearing for continuous beams commonly used in railways is a type of spherical bearing for railway bridges that is frequently used in railway construction. The spherical bearing for railway bridges is completed through casting, processing and assembly.

[0004] Application number CN202123358957.8 discloses a novel spherical steel bearing for continuous beams, including a lower bearing plate and an upper bearing plate. The lower and upper bearing plates are directly equipped with a combined friction pair structure. Currently, in commonly used railway spherical steel bearings for long-span continuous beams, the four corners of the guide strips on the longitudinal and transverse lower bearing plates have a small height and a large depth space with the bottom surface. Due to the geometry of the blank, this space is prone to sand formation during casting, increasing the difficulty and cost of cleaning the casting and hindering subsequent processing, thus wasting time and effort and affecting work efficiency. Therefore, how to avoid sand formation in the casting, reduce cleaning difficulty, reduce processing time and difficulty, and save costs is a technical problem that needs to be solved. Summary of the Invention

[0005] In order to solve the above problems, according to some embodiments, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a casting mold for the lower support plate of a spherical steel support for a continuous span beam, comprising: a bottom plate-shaped member, a middle plate-shaped member, and a top cylindrical member arranged sequentially from bottom to top. The sides of the top cylindrical member and the middle plate-shaped member are compacted with chromite sand, and the outer surface is coated with cast steel paint. During processing, the middle plate-shaped member is used as the processing reference for the upper plane of the bottom plate-shaped member. This effectively avoids the existence of a small height and large depth space between the four corners of the two sides in contact with the guide strip and the bottom surface, so that sand is avoided from forming in this space during the casting process, reducing the difficulty of cleaning the casting.

[0007] Furthermore, the bottom plate is square, the upper surface of the bottom plate is flat, and a central plate is set at the center of the upper surface; the bottom plate is shaped like a water glass quartz sand pit.

[0008] Furthermore, the central plate-shaped component is a platform, and its upper and lower surfaces are square.

[0009] Furthermore, the lower surface dimension of the middle plate-shaped component is larger than that of the upper surface.

[0010] Furthermore, the upper surface of the top cylindrical component has a concave spherical surface, and a cylindrical riser is provided on one side of the upper surface of the top cylindrical component; a horizontal applicator is provided around the riser; and an ingate is provided at the edge of the riser.

[0011] Furthermore, a direct sprue is provided on one side of the upper surface of the top cylindrical component.

[0012] Secondly, the present invention provides a method for preparing a casting mold for the lower support plate of a spherical steel support for a continuous span beam, comprising:

[0013] Based on the structural shape of the lower support plate of the spherical support, a sand mold is made, and a bottom plate-shaped component is formed by shaping a pit using water glass quartz sand.

[0014] The middle plate-shaped part is used as the machining reference for the upper plane of the bottom plate-shaped part, and the middle plate-shaped part is set at the center of the upper plane of the bottom plate-shaped part;

[0015] A top cylindrical component is set on the upper surface of the middle plate-shaped component. The concave spherical surface of the top cylindrical component is scraped out with a scraper, and the rest of the part is pounded out with a real model.

[0016] A gate is provided on one side of the top surface of the top cylindrical component, and a cylindrical riser is provided on the other side of the top surface of the top cylindrical component.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. In this invention, the side areas of the top cylindrical part and the middle plate-shaped part are compacted with chromite sand during shaping. After shaping, cast steel coating is applied. The middle plate-shaped part is used as the machining reference for the upper plane of the bottom plate-shaped part. This effectively avoids the existence of spaces with small height and large depth between the four corners of the two sides of the guide strip and the bottom surface. This prevents the formation of sand in these spaces during the casting process, reduces the difficulty of cleaning the casting, reduces the processing time and difficulty, saves costs, and improves work efficiency.

[0019] 2. In this invention, molten steel is poured simultaneously from two sprues, and four ingates are introduced into the mold through a reverse tangent at the edge of the riser. The middle plate-shaped part is used as the machining reference for the upper plane of the bottom plate-shaped part, which avoids sand formation in the casting and solves the problem of how to avoid sand formation in the casting and reduces the difficulty of cleaning.

[0020] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0023] Figure 1 The front view of the casting mold for the lower support plate of the spherical steel support for a continuous span beam;

[0024] Figure 2 This is a cross-sectional view of the casting mold for the lower support plate of the spherical steel support for a continuous span beam.

[0025] Figure 3 A top view of the casting mold for the lower support plate of a spherical steel support for a continuous span beam;

[0026] Among them: 1. Bottom plate; 2. Middle plate; 3. Top cylindrical part; 31. Right angle opening; 32. Concave spherical surface; 33. Riser. Detailed implementation method:

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, 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.

[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] Example 1:

[0031] like Figures 1-3As shown, this embodiment provides a casting mold for the lower support plate of a spherical steel support for a continuous span beam, comprising: a bottom plate-shaped member, a middle plate-shaped member, and a top cylindrical member connected sequentially from bottom to top. The sides of the top cylindrical member and the middle plate-shaped member are compacted with chromite sand, and the outer surface is coated with cast steel paint. During processing, the middle plate-shaped member is used as the processing reference for the upper plane of the bottom plate-shaped member, thereby avoiding sand formation in the casting, reducing the difficulty of cleaning, reducing processing time and difficulty, saving costs, and improving work efficiency.

[0032] When shaping the side areas of the top cylindrical part and the middle plate-shaped part, chromite sand is used to compact the surface. After shaping, cast steel coating is applied. The middle plate-shaped part is used as the machining reference for the upper plane of the bottom plate-shaped part. This effectively avoids the existence of a small height and large depth space between the four corners of the two sides of the guide bar and the bottom surface. This prevents the formation of sand in this space during the casting process and reduces the difficulty of cleaning the casting.

[0033] The bottom plate-shaped component adopts a water glass quartz sand pit shape, and its structure is a square shape that matches the lower support plate. The upper surface of the bottom plate-shaped component is flat, and a middle plate-shaped component is set in the middle of the upper surface. The lower surface is also flat.

[0034] The middle plate-shaped component is a platform. The upper and lower surfaces of the middle plate-shaped component are square, with the lower surface being larger than the upper surface. A top cylindrical component is installed on the upper surface of the middle plate-shaped component, and the lower surface of the middle plate-shaped component is set on the upper surface of the bottom plate-shaped component.

[0035] The upper surface of the top cylindrical component has a concave spherical surface, and a cylindrical riser is provided on the upper surface of the top cylindrical component. A horizontal support is provided around the riser, and an external chill is used in conjunction to meet the feeding requirements of sequential solidification of the casting. Molten steel is poured simultaneously using two direct gating gates, and four ingates are located at the edge of the riser.

[0036] The process is as follows:

[0037] Based on the structural shape of the lower support plate of the spherical bearing, a sand mold is made. Water glass quartz sand is used to form the bottom plate-like part in the pit. The upper surface of the bottom plate-like part is used as the parting surface and the sand is poured horizontally.

[0038] The middle plate-shaped part is used as the machining reference for the upper plane of the bottom plate-shaped part, and the middle plate-shaped part is set at the center of the upper plane of the bottom plate-shaped part;

[0039] A top cylindrical component is set on the upper surface of the middle plate-shaped component. The concave spherical surface of the top cylindrical component is scraped out with a scraper, and the rest of the part is pounded out with a real model.

[0040] A gate is provided on the top surface of the top cylindrical component, and a cylindrical riser is provided on the upper surface of the top cylindrical component.

[0041] Prepare the gating system. Two sprues are used, and the ingate typically consists of four bottom-reverse tangential lines located at the edge of the riser. A spot gate is provided on the side edge of the riser.

[0042] Riser design. A cylindrical riser is set at the edge of the upper surface of the top cylindrical component. The weight of the riser is calculated by the formula, where G_component = weight of casting + weight of riser allowance, and the riser height-to-diameter ratio H / D = 1.2~1.4. This design can minimize or avoid defects such as sand holes and sand inclusions on the upper surface of the casting.

[0043] Horizontal riser design. The maximum hot-joint circle of the casting is drawn graphically, and the horizontal riser is created using a rolling method, typically with a β value of 20–30°. During the pouring process, sand, impurities, gas, slag, etc., entrained in the molten steel can be flushed into the riser, effectively preventing such defects from solidifying and forming inside or on the upper surface of the casting.

[0044] Figure 1 When shaping the area shown in serial number 1, chromite sand was used to compact the surface, and after shaping, cast steel coating was applied. Figure 1 When making molds for the area shown in number 2, reduce the amount of machining required, and during machining... Figure 1 The area shown in Figure 2 is the machining reference for the flat surface on the bottom surface. This avoids sand formation in the casting, reduces cleaning difficulty, reduces machining time and difficulty, saves costs, and improves work efficiency.

[0045] The railway commonly uses casting of longitudinal and transverse lower support plates for spherical steel bearings for continuous beams, which avoids sand formation in the castings, reduces cleaning difficulty, reduces processing time and difficulty, saves costs, and improves work efficiency.

[0046] Example 2

[0047] This embodiment provides a method for preparing a casting mold for the lower support plate of a spherical steel support for a continuous span beam, including:

[0048] Based on the structural shape of the lower support plate of the spherical support, a sand mold is made, and a bottom plate-shaped component is formed by shaping a pit using water glass quartz sand.

[0049] The middle plate-shaped part is used as the machining reference for the upper plane of the bottom plate-shaped part, and the middle plate-shaped part is set at the center of the upper plane of the bottom plate-shaped part;

[0050] A top cylindrical component is set on the upper surface of the middle plate-shaped component. The concave spherical surface of the top cylindrical component is scraped out with a scraper, and the rest of the part is pounded out with a real model.

[0051] A gate is provided on one side of the top surface of the top cylindrical component, and a cylindrical riser is provided on the other side of the top surface of the top cylindrical component.

[0052] During casting, molten steel is poured simultaneously from two sprues, and four ingates are introduced into the mold via a bottom reverse tangent at the edge of the riser.

[0053] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A casting mold for the lower support plate of a spherical steel support for a continuous span beam, characterized in that, include: The components arranged from bottom to top are a bottom plate, a middle plate, and a top cylindrical component; the sides of the top cylindrical component and the middle plate are made of chromite sand and coated with cast steel paint on the outer surface; the middle plate is used as the machining reference for the upper plane of the bottom plate during processing. The central plate-shaped component is a platform, and its upper and lower surfaces are square. The lower surface dimension of the middle plate-shaped component is larger than that of the upper surface; The upper surface of the bottom plate is used as the parting surface.

2. The casting mold for the lower support plate of the spherical steel support for a continuous span beam as described in claim 1, characterized in that, The bottom plate is square, and the upper surface of the bottom plate is flat, with a central plate at the center of the upper surface.

3. The casting mold for the lower support plate of the spherical steel support for a continuous span beam as described in claim 1, characterized in that, The upper surface of the top cylindrical component has a concave spherical surface, and a cylindrical riser is provided on one side of the upper surface of the top cylindrical component.

4. The casting mold for the lower support plate of the spherical steel support for a continuous span beam as described in claim 3, characterized in that, A horizontal subsidy is set around the riser.

5. The casting mold for the lower support plate of the spherical steel support for a continuous span beam as described in claim 3, characterized in that, An inner gating system is provided at the edge of the riser.

6. The casting mold for the lower support plate of the spherical steel support for a continuous span beam as described in claim 1, characterized in that, A direct sprue is provided on one side of the upper surface of the top cylindrical component.

7. A method for preparing a casting mold for the lower support plate of a spherical steel support for a continuous span beam, comprising using a casting mold for the lower support plate of a spherical steel support for a continuous span beam as described in any one of claims 1-6, characterized in that... include: Based on the structural shape of the lower support plate of the spherical support, a sand mold is made, and a bottom plate-shaped component is formed by shaping a pit using water glass quartz sand. The middle plate-shaped part is used as the machining reference for the upper plane of the bottom plate-shaped part, and the middle plate-shaped part is set at the center of the upper plane of the bottom plate-shaped part; A top cylindrical component is set on the upper surface of the middle plate-shaped component. The concave spherical surface of the top cylindrical component is scraped out with a scraper, and the rest of the part is pounded out with a real model. A gate is provided on one side of the top surface of the top cylindrical component, and a cylindrical riser is provided on the other side of the top surface of the top cylindrical component.

Images