Residue filtering method of lost foam full-mold casting small part casting system

Abstract

The invention discloses an evanescent mode full mold casting small part casting system slag filtering method, and relates to the technical field of part casting, the method comprises the following steps: 1, a main pouring gate: a main pouring gate vertical pipe, a filter box, a ceramic filter screen, a main pouring gate tee joint, a main pouring gate transverse pipe and a main pouring gate elbow are connected in sequence; secondly, branch pouring gates are formed, specifically, according to the number of the lost foam small parts, the needed number of branch pouring gate tee joints, branch pouring gate transverse pipes and branch pouring gate bent pipes are connected; thirdly, a pouring gate bent pipe and an evanescent mode small part model part are divided, and a gasket is placed; and 4, during sand burying molding, all the casting models are horizontally placed at the same height. Through the connection of the three-way paper tube, the number of the small evanescent mode parts in the whole pouring system can be randomly adjusted; the special filter cartridge can filter a plurality of casting metal liquids, so that the production cost is greatly reduced, the equipment is simplified, the redundant waste is reduced, and the maximum utilization is realized.

Description

Technical Field

[0001] This invention relates to the technical field of parts casting, and more particularly to a slag filtering method for a lost foam casting system for small parts. Background Technology

[0002] Lost foam casting is an advanced casting process. The process involves first creating a model using foam plastic that perfectly matches the shape of the casting. Then, a refractory coating is applied to the model's surface, and it is embedded in dry sand and vibrated to compact it. During pouring, the high-temperature molten metal instantly vaporizes the model and fills the cavity, ultimately resulting in a casting that perfectly matches the model's shape. This method simplifies the process and is particularly suitable for forming complex structural parts.

[0003] Currently, two prominent problems exist in the production of small castings using lost foam casting. First, existing gating systems lack flexible adjustment capabilities, failing to dynamically optimize the casting process based on the actual quantity or arrangement of the lost foam each time. This makes it difficult to precisely adapt process parameters for different batches or layout patterns, affecting not only the stability and efficiency of molten metal filling but also limiting the production line's responsiveness to multi-variety, small-batch orders. Second, during conventional casting, improper control of processes such as vibration sand filling, negative pressure evacuation, or pouring impact can easily cause dry sand in the mold cavity to migrate or disintegrate, infiltrating the molten metal and resulting in internal sand inclusions, surface roughness, or even defects that render the casting unusable. This problem severely impacts the consistency and reliability of the finished casting quality and urgently requires a systematic solution through optimized process design and strengthened process control. Summary of the Invention

[0004] The purpose of this invention is to provide a slag filtering method for a lost foam casting system for small parts, in order to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution, comprising the following steps:

[0006] Step 1: Main runner: The main runner vertical pipe, filter box, ceramic filter screen, main runner tee, main runner horizontal pipe and main runner bend are connected in sequence;

[0007] Step 2: Sprue: Based on the number of lost foam small parts, connect the required number of sprue tees, sprue horizontal pipes, and sprue bends;

[0008] Step 3: Place shims on the sprue bend and the small lost foam mold parts;

[0009] Step 4: During the sand molding process, all casting models should be placed horizontally at the same height.

[0010] Furthermore, the main gating vertical pipe, main gating tee, main gating horizontal pipe, and main gating bend are all made of hollow paper tubes;

[0011] In practical applications, the hollow structure facilitates the flow of molten iron and effectively reduces the residue from the combustion of the material. At the same time, the paper tube body has a certain strength, which can effectively separate the sand mold from the molten iron and reduce the resistance caused by sand adhesion.

[0012] Furthermore, the filter box is divided into an upper filter box and a lower filter box. The end of the upper filter box that is connected to the main gating vertical pipe has a tapered structure, and the end of the lower filter box that is connected to the main gating tee has a tapered structure.

[0013] In practical applications, the conical design can reduce the impact of molten iron on the ceramic filter screen, prevent the ceramic filter screen from breaking, affecting the molten iron filtration effect, and prevent the filter screen from being entrained by molten iron, causing casting defects. At the same time, the conical structure of the filter box guides the molten metal to flow smoothly into the mold cavity, avoiding the impact of dry sand that could cause particles to be entrained.

[0014] Furthermore, the ceramic filter screen has evenly distributed circular through holes to filter molten iron and remove slag and dry sand particles ≥0.4mm.

[0015] In practical applications, the small holes in the filter screen reduce turbulence in molten iron and decrease the impact force during the molten iron stamping process, thereby reducing the heat-resistant coating on the surface of small lost-foam parts.

[0016] Furthermore, the gasket is made of a rigid material;

[0017] In practical applications, by placing shims, it is possible to effectively prevent the paper tube from inserting into the lost foam model body during the sand burying process.

[0018] Furthermore, the upper and lower filter boxes are provided with C-shaped clips on both sides, and anti-slip blocks are fixedly provided at both ends of the C-shaped clips. The outer walls of the upper and lower filter boxes are respectively provided with anti-slip textures to cooperate with the anti-slip blocks. The C-shaped clips are made of elastic material.

[0019] In practical applications, the U-shaped clamp effectively prevents sand from entering the filter box. Compared with existing technologies, this invention has the following advantages:

[0020] A. By connecting the three-way paper tubes, the number of small lost foam parts in the entire casting system can be randomly adjusted;

[0021] B. A dedicated filter box can filter multiple castings of molten metal, which greatly reduces production costs, simplifies equipment, reduces unnecessary waste, and maximizes utilization.

[0022] C. When the casting is less than 1T, several T-shaped conduits can be connected to the rear section of the special filter box. Each T-shaped conduit is connected to the casting, and the total weight of the casting does not exceed 1T. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall installation process proposed in this invention;

[0024] Figure 2 This is a schematic diagram of the ceramic filter structure proposed in this invention;

[0025] Figure 3 This is a schematic diagram of the filter box structure proposed in this invention;

[0026] Figure 4 This is a schematic diagram of the C-shaped clamp structure proposed in this invention.

[0027] In the diagram: 1. Main runner vertical pipe; 2. Special filter box; 201. Upper filter box; 202. Lower filter box; 3. Ceramic filter screen; 4. Main runner tee; 5. Main runner horizontal pipe; 6. Main runner bend; 7. Sub-runner tee; 8. Sub-runner horizontal pipe; 9. Sub-runner bend; 10. Gasket; 11. C-shaped clamp. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] Reference Figure 1-4 A method for filtering slag in a lost foam casting system for small parts includes the following steps:

[0031] Step 1: Main runner: The main runner vertical pipe 1, filter box 2, ceramic filter screen 3, main runner tee 4, main runner horizontal pipe 5, and main runner bend 6 are connected in sequence;

[0032] Step 2: Sprue: Based on the number of lost foam small parts, connect the required number of sprue tees 7, sprue horizontal pipes 8, and sprue bends 9;

[0033] Step 3: Place shims 10 on the sprue bend 9 and the lost foam casting small parts;

[0034] Step 4: During the sand molding process, all casting models should be placed horizontally at the same height.

[0035] Furthermore, the main runner vertical pipe 1, the main runner tee 4, the main runner horizontal pipe 5, and the main runner bend 6 are all made of hollow paper tubes;

[0036] In practical applications, the hollow structure facilitates the flow of molten iron and effectively reduces the residue from the combustion of the material. At the same time, the paper tube body has a certain strength, which can effectively separate the sand mold from the molten iron and reduce the resistance caused by sand adhesion.

[0037] Furthermore, the filter box 2 is divided into an upper filter box 201 and a lower filter box 202. The end of the upper filter box 201 connected to the main gating vertical pipe 1 has a conical structure, and the end of the lower filter box 202 connected to the main gating tee 4 has a conical structure.

[0038] In practical applications, the conical design can reduce the impact of molten iron on the ceramic filter screen 3, prevent the ceramic filter screen 3 from breaking, affecting the molten iron filtration effect and preventing the filter screen from being entrained by molten iron, causing casting defects; at the same time, the conical structure of the filter box guides the molten metal to flow smoothly into the mold cavity, avoiding the impact of dry sand causing particles to be entrained.

[0039] Furthermore, the ceramic filter screen 3 has evenly distributed circular through holes to filter molten iron and remove slag and dry sand particles ≥0.4mm.

[0040] In practical applications, the small holes in the filter screen reduce turbulence in molten iron and decrease the impact force during the molten iron stamping process, thereby reducing the heat-resistant coating on the surface of small lost-foam parts.

[0041] Furthermore, the gasket 10 is made of a rigid material;

[0042] In practical applications, by placing shims, it is possible to effectively prevent the paper tube from inserting into the lost foam model body during the sand burying process.

[0043] Furthermore, the upper filter box 201 and the lower filter box 202 are provided with C-shaped clips 11 on both sides, and anti-slip blocks are fixedly provided at both ends of the C-shaped clips 11. The outer walls of the upper filter box 201 and the lower filter box 202 are respectively provided with anti-slip textures to cooperate with the anti-slip blocks. The C-shaped clips 11 are made of elastic material.

[0044] In practical applications, the U-shaped clamp 11 can effectively prevent sand from entering the filter box 2.

[0045] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for filtering slag in a lost foam casting system for small parts, characterized in that, Includes the following steps: Step 1: Main runner: The main runner vertical pipe (1), filter box (2), ceramic filter screen (3), main runner tee (4), main runner horizontal pipe (5) and main runner bend (6) are connected in sequence; Step 2: Sprue: Based on the number of lost foam small parts, connect the required number of sprue tees (7), sprue horizontal pipes (8), and sprue bends (9); Step 3: Place the shims (10) on the sprue bend (9) and the lost foam small part model; Step 4: During the sand molding process, all casting models should be placed horizontally at the same height.

2. The slag filtering method for a lost foam casting system for small parts according to claim 1, characterized in that, The main gating riser (1), main gating tee (4), main gating horizontal pipe (5) and main gating bend (6) are all made of hollow paper tubes.

3. The slag filtering method for a lost foam casting system for small parts according to claim 2, characterized in that, The filter box (2) is divided into an upper filter box (201) and a lower filter box (202). The upper filter box (201) is connected to the main gating vertical pipe (1) at one end, which is a conical structure. The lower filter box (202) is connected to the main gating tee (4) at one end, which is a conical structure.

4. The slag filtering method for a lost foam casting system for small parts according to claim 1, characterized in that, The ceramic filter screen (3) has evenly distributed circular through holes to filter molten iron and remove slag and dry sand particles ≥0.4mm.

5. The slag filtering method for a lost foam casting system for small parts according to claim 1, characterized in that, The gasket (10) is made of a rigid material.

6. The slag filtering method for a lost foam casting system for small parts according to claim 3, characterized in that, The upper filter box (201) and the lower filter box (202) are provided with U-shaped clips (11) on both sides. Anti-slip blocks are fixedly provided at both ends of the U-shaped clips (11). The outer walls of the upper filter box (201) and the lower filter box (202) are respectively provided with anti-slip textures to cooperate with the anti-slip blocks. The U-shaped clips (11) are made of elastic material.

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