Casting process of semicircular casting

Abstract

The invention discloses a casting technology of a semicircular casting. The casting technology comprises the following steps of mold making, tree assembling, shell making, dewaxing, roasting, pouring, sand removing, riser gas cutting, heat treatment, finishing and result judgment. According to the casting technology of the semicircular casting, the circular casting is subjected to shell making pouring, the finished product is obtained after cutting, compared with direct pouring of the semicircular casting, the efficiency and the yield can be improved, the size of the manufactured casting is not deformed, follow-up correction is not needed, the requirement for the size of the casting is met, the technology yield is increased, and the production cost is reduced. The cost of a factory is reduced, on-time delivery is also guaranteed, a cutting line is arranged on a circular casting to provide quality guarantee for finished products at subsequent cutting positions, the problem that a wax mold cannot be thoroughly discharged is solved by utilizing an angle-adjustable rotating device when the wax mold is liquefied by utilizing a steam kettle, meanwhile, stable fixation of the mold can be realized, and the production efficiency is improved. And the safety in the process machining process is ensured, and the casting precision and efficiency of castings are improved.

Description

Technical Field

[0001] The present application relates to the technical field of casting application, and in particular to a casting process of a semicircular casting. Background Art

[0002] Semicircular castings are widely used. They can be used as reinforcements to fasten key parts of pipelines by bolts, or they can be directly welded to the welding end of the valve body by electric welding. This semicircular casting is made of WCB, which is low-carbon steel. It is precision cast using low-temperature wax investment. The outline dimensions are: outer radius 300mm, inner radius 180mm, and thickness 110mm. The casting has strict dimensional tolerance requirements and must meet IS08062-CT8 level. The internal quality RT level reaches ASTM B16.34-Ⅲ level, and has high technical requirements for casting process design: it is necessary to ensure the dimensional tolerance requirements of the castings and meet the customer's internal quality standards.

[0003] According to the shape characteristics of the product, the existing solution is to directly make a wax mold of a semicircular structure and cast it after shelling. However, the surface flatness exceeds the tolerance by 1.5-2mm, and there is warping and deformation. A press is required for correction, and the workload of rework is large. Therefore, the design is made by combining two semicircles into one, and a cutting line is set at the connection to leave a cutting margin for later cutting and separating the castings to prevent the castings from digging. Due to the setting of the cutting line, shelling material exists in the cutting line on the surface of the wax mold after shelling, that is, the inner wall of the finished shell forms a bulge identical to the cutting line. When using a steam kettle, When the wax pattern is evaporated, the melted wax liquid will remain due to the bulge on the inner wall of the finished shell product. Even if the riser is inverted, it is still difficult to ensure that the wax liquid is completely discharged. During subsequent pouring, pores or defects may be formed on the surface of the casting due to the presence of residual wax liquid, affecting the surface finish and quality of the casting. Although adjusting the angle of the mold in the steam kettle can ensure the discharge of the wax liquid, it will cause the mold to shake, and it is inconvenient to adjust in the steam kettle. If the shaking amplitude is too large, it may cause the mold to bump and affect the subsequent processing quality, thereby reducing the casting accuracy and efficiency of the semicircular casting. Summary of the invention

[0004] In this embodiment, a casting process for a semicircular casting is provided to solve the problems of poor casting precision and low efficiency of semicircular castings in the prior art.

[0005] According to one aspect of the present application, a casting process for a semicircular casting is provided, the process comprising the following steps:

[0006] (1) Mold making, a wax film integral circular casting, and two risers of the same structure, the risers have a size of L110xW100xH20mm, and are arranged on the corresponding center line;

[0007] (2) Assembling the tree, bonding two risers to the surface of the casting to obtain a wax mold casting structure, leaving a 10 mm margin and a cutting line at the circular casting between the two risers to leave a cutting margin for later cutting and separating the castings to prevent the casting from digging;

[0008] (3) Shell making: The module after the assembly tree is bonded is coated with a coating. The first three layers are silica sol coating, the surface layer is mullite sand 30-60 mesh, the second and third layers are mullite sand 16-30 mesh; the reinforcement layer is water glass coating, mullite sand 10-16 mesh, a total of 12 layers;

[0009] (4) Dewaxing: using a steam kettle device, the dewaxing temperature is ≥120°C, and the time is 35-40 minutes;

[0010] (5) Calcination, with the riser facing downward, at a temperature of 950-1050°C for ≥90 min;

[0011] (6) Pouring: if the composition is qualified, the ladle is aligned with the riser 2 for pouring, the pouring temperature is 1550-1570°C, and the pouring time is 16-20s;

[0012] (7) Sand cleaning: Use electric pick to clean sand without impacting the casting surface;

[0013] (8) Gas cutting of risers, removing two risers;

[0014] (9) Heat treatment, normalizing and tempering;

[0015] (10) Finishing, remove burrs and flash, and use wire cutting to cut into two parts before processing, without deformation, and without oxyacetylene flame cutting;

[0016] (11) Inspection: inspect the size of the round casting according to the drawing requirements and perform RT inspection according to customer requirements

[0017] (12) Result judgment: RT test meets customer standards, the size and surface flatness are within 1mm, and the casting is qualified.

[0018] Furthermore, the steam kettle device in step (4) is composed of a kettle body, and a support, a collecting tank and a steam generator are fixedly installed on the bottom of the kettle body, respectively. The collecting tank is connected to the interior of the kettle body, and the top edge of the collecting tank is fixedly connected to the guide plate. The side wall of the kettle body is rotatably connected to a side cover for loading and unloading the shell making mold. A fixing frame is fixedly installed on the surface of the kettle body on the other side of the side cover, and the top of the fixing frame is fixedly connected to an electric push rod, and the telescopic end of the electric push rod passes through the kettle body and extends to the interior of the kettle body, and the telescopic end of the electric push rod is sealed and sleeved with the kettle body.

[0019] In the present technical solution, a driving device is fixedly installed on the top of the steam kettle device, and the driving device consists of a driving motor and a shell. The driving motor is fixedly connected to the middle part of the top of the kettle body, the shell is fixedly connected to both sides of the top of the kettle body and is communicated with the inside of the kettle body, and the interiors of the two shells are respectively sealed and rotatably connected to the two ends of the rotating shaft, the middle part of the rotating shaft is fixedly connected to the first transmission gear, the output end of the driving motor is fixedly connected to the driving gear, and the driving gear is meshingly connected to the first transmission gear.

[0020] In the present technical solution, a rotating device is provided inside the steam kettle device, and the rotating device is composed of a gear ring, and the gear ring is in contact with the inner wall of the kettle body. There are two gear rings, each of which is located inside a number of limiting sleeves, and each limiting sleeve is evenly distributed to the inner wall of the kettle body and fixedly connected to the kettle body. The gear ring is meshed with the second transmission gear, and the second transmission gear is located inside the shell and fixedly connected to both ends of the rotating shaft.

[0021] In the present technical solution, the edges of the gear ring are respectively fixedly connected to the two ends of several horizontal plates, wherein the inner walls of two horizontal plates are fixedly connected with arc-shaped plates, and two L-shaped brackets are fixedly connected to the inside of one of the gear rings, and the two brackets are symmetrically distributed on both sides of the gear ring, and the two brackets are respectively fixedly connected to the two ends of the side plates, and the bottom of the bracket is rotatably connected to the card plate, and the surface of the card plate is connected to the side plate through obliquely distributed springs, and the card plate is correspondingly arranged below the electric push rod.

[0022] In the present technical solution, a limiting mechanism is provided on the gear ring and the cross plate, and the limiting mechanism includes a sleeve and a pressure plate. The sleeve is fixedly installed to the inner wall of the gear ring and the inner wall of the cross plate. The bottom of the sleeve is rotatably connected with a screw sleeve, the inside of the screw sleeve is threadedly sleeved with a threaded rod, the threaded rod is movably sleeved with the inside of the sleeve, and the threaded rod is fixedly connected to the top surface of the pressure plate.

[0023] In the technical solution, the wax mold casting structure consists of a circular wax mold casting and two risers, and a concave cutting line is provided on the surface of the circular wax mold casting located between the two risers.

[0024] In the present technical solution, a positioning device is slidably connected to the bottom of the arc plate, and the positioning device includes a sliding sleeve and a limit plate. The number of the sliding sleeves is two and the cross-sections are both U-shaped structures. The sliding sleeve is slidably connected to the bottom of the arc plate, and the limit plate is fixedly connected to the top of the sliding sleeve. The inner wall of the limit plate is provided with two horizontally distributed convex strips, and a support plate is provided between the limit plates located inside the convex strips. A stop block is fixedly connected to the bottom of the support plate, and the stop block contacts the limit plate. A number of sockets for riser plug-in are provided on both side edges of the support plate, and one side of the support plate is clamped with the clamping plate.

[0025] In the present technical solution, an adjustment mechanism is provided on the inner wall of the limit plate, and the adjustment is located on the upper surface of the convex strip. The adjustment mechanism includes a worm and a worm wheel. The worm is rotatably connected to the upper side of the convex strip. The worm is horizontally distributed and extends to the outside of the limit plate. The side wall of the limit plate is rotatably connected to the worm wheel, and the edge of the worm wheel is fixedly connected to the push rod of the L-shaped structure.

[0026] In this technical solution, the top of the limiting plate is rotatably connected to the positioning plate, the positioning plate is a bent structure and is arranged on the inner wall of the limiting plate, an adjustment mechanism is provided between the limiting plate and the positioning plate, and the inner wall of the positioning plate is in contact with the push rod.

[0027] Through the above-mentioned embodiments of the present application, a casting process for semicircular castings is adopted to solve the problems of low efficiency and poor quality of finished products during casting of semicircular castings. Shell casting is performed on circular castings, and the finished products are obtained after cutting. Compared with directly pouring semicircular castings, efficiency and yield can be improved, and the size of the obtained castings is not deformed, and no post-process correction is required, which meets the casting size requirements and improves the process output rate. It not only reduces costs for the factory, but also ensures timely delivery. Cutting lines are set on the circular castings to provide quality assurance for the finished products at the subsequent cutting points. When the wax mold is liquefied by a steam kettle, a rotating device with an adjustable angle is used to solve the problem that the wax mold cannot be completely discharged. At the same time, the mold can be stably fixed to ensure safety during the process, improve quality assurance for subsequent production, and improve the casting accuracy and efficiency of castings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 A schematic diagram of a method flow of an embodiment of the present application;

[0030] Figure 2 This is an overall three-dimensional schematic diagram of a steam kettle device according to an embodiment of the present application;

[0031] Figure 3 This is a schematic diagram of the interior of a steam kettle device according to an embodiment of the present application;

[0032] Figure 4 This is a schematic diagram of the internal side view of a steam kettle device according to an embodiment of the present application;

[0033] Figure 5 This is a three-dimensional schematic diagram of a rotating device according to an embodiment of the present application;

[0034] Figure 6 A rear view schematic diagram of a rotating device according to an embodiment of the present application;

[0035] Figure 7 A schematic top view of a rotating device according to an embodiment of the present application;

[0036] Figure 8 A schematic side view of a positioning device according to an embodiment of the present application;

[0037] Fig. 9 This is a partial three-dimensional schematic diagram of a positioning device according to an embodiment of the present application;

[0038] Fig.10 This is a three-dimensional schematic diagram of the wax mold casting structure of an embodiment of the present application.

[0039] Description of Reference Numerals

[0040] 100, steam kettle device; 101, kettle body; 102, collecting tank; 103, steam generator; 104, guide plate; 105, side cover; 106, fixing frame; 107, electric push rod; 108, limit sleeve;

[0041] 200, driving device; 201, driving motor; 202, driving gear; 203, housing; 204, rotating shaft; 205, first transmission gear; 206, second transmission gear;

[0042] 300, rotating device; 301, gear ring; 302, horizontal plate; 303, arc plate; 304, bracket; 305, side plate; 306, clamping plate; 307, spring; 308, sleeve; 309, screw sleeve; 310, threaded rod; 311, pressing plate;

[0043] 400, positioning device; 401, sliding sleeve; 402, limiting plate; 403, positioning plate; 404, supporting plate; 405, worm; 406, worm wheel; 407, push rod; 408, jack; 409, stop block;

[0044] 500. Wax casting structure; 501. Round wax casting; 502. Riser; 503. Cutting line. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0047] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0048] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0049] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] The new die-casting process of the embodiment of the present application is introduced below.

[0051] See also Figure 1 As shown, a casting process of a semicircular casting comprises the following steps:

[0052] (1) Mold making, a wax film integral circular casting, and two risers 502 of the same structure are made, and the risers 502 have a size of L110xW100xH20mm and are arranged on the corresponding center line;

[0053] (2) Assembling the tree, bonding two risers 502 to the surface of the casting to obtain a wax mold casting structure 500, leaving a 10 mm margin and a cutting line 503 at the circular casting between the two risers 502, leaving a cutting margin for later cutting and separating the castings to prevent the castings from digging;

[0054] (3) Shell making: The module after the assembly tree is bonded is coated with a coating. The first three layers are silica sol coating, the surface layer is mullite sand 30-60 mesh, the second and third layers are mullite sand 16-30 mesh; the reinforcement layer is water glass coating, mullite sand 10-16 mesh, a total of 12 layers;

[0055] (4) Dewaxing, using a steam kettle device 100, the dewaxing temperature is ≥ 120° C., and the time is 35-40 min;

[0056] (5) Firing, with the riser 502 facing downward, at a temperature of 950-1050°C for a time of ≥90 min;

[0057] (6) Pouring: if the composition is qualified, the ladle is aligned with the riser 5022 for pouring, the pouring temperature is 1550-1570°C, and the pouring time is 16-20s;

[0058] (7) Sand cleaning: Use electric pick to clean sand without impacting the casting surface;

[0059] (8) Gas cutting the risers 502 to remove the two risers 502;

[0060] (9) Heat treatment: normalizing and tempering;

[0061] (10) Finishing, remove burrs and flash, and use wire cutting to cut into two parts before processing, without deformation, and without oxyacetylene flame cutting;

[0062] (11) Inspection: inspect the size of the round casting according to the drawing requirements and perform RT inspection according to customer requirements

[0063] (12) Result judgment: RT test meets customer standards, the size and surface flatness are within 1mm, and the casting is qualified.

[0064] The steam kettle device 100 in step 4 is composed of a kettle body 101, and a support, a collecting tank 102 and a steam generator 103 are fixedly installed at the bottom of the kettle body 101, respectively. The collecting tank 102 is communicated with the inside of the kettle body 101, and the top edge of the collecting tank 102 is fixedly connected to the guide plate 104. The side wall of the kettle body 101 is rotatably connected with a side cover 105 for loading and unloading the shell making mold. A fixing frame 106 is fixedly installed on the surface of the kettle body 101 on the other side of the side cover 105. The top of the fixing frame 106 is fixedly connected to an electric push rod 407107, and the telescopic end of the electric push rod 407107 penetrates the kettle body 101 and extends to the inside of the kettle body 101, and the telescopic end of the electric push rod 407107 is sealed and sleeved with the kettle body 101.

[0065] In the present technical solution, the steam generator 103 operates to generate high-pressure and high-temperature gas that enters the kettle body 101, causing the wax liquid to melt and flow to the inside of the collecting tank 102. The guide plate 104 is used to guide the wax liquid, facilitating subsequent recycling and processing. During dewaxing, the side cover 105 is opened to place the wax mold and the shell on the support plate 404. After the support plate 404 and the sliding sleeve 401 are pushed into the kettle body 101, the dewaxing process is carried out.

[0066] The top of the steam kettle device 100 is fixedly installed with a driving device 200, and the driving device 200 is composed of a driving motor 201 and a shell 203. The driving motor 201 is fixedly connected to the middle of the top of the kettle body 101, and the shell 203 is fixedly connected to both sides of the top of the kettle body 101 and communicated with the inside of the kettle body 101. The insides of the two shells 203 are respectively connected to the two ends of the rotating shaft 204 in a sealed rotation connection, and the middle of the rotating shaft 204 is fixedly connected to the first transmission gear 205. The output end of the driving motor 201 is fixedly connected to the driving gear 202, and the driving gear 202 is connected to the first transmission gear 205. The transmission gear 205 is meshed and connected; a rotating device 300 is provided inside the steam kettle device 100, and the rotating device 300 is composed of a gear ring 301, and the gear ring 301 is in contact with the inner wall of the kettle body 101. There are two gear rings 301, and each gear ring 301 is located inside a plurality of limiting sleeves 108, and each limiting sleeve 108 is evenly distributed to the inner wall of the kettle body 101 and fixedly connected to the kettle body 101. The gear ring 301 is meshed and connected with the second transmission gear 206, and the second transmission gear 206 is located inside the shell 203 and fixedly connected to both ends of the rotating shaft 204.

[0067] In this technical solution, the drive motor 201 is started, and the driving gear 202 and the first transmission gear 205 cooperate to drive the rotating shaft 204 to rotate inside the shell 203, and then drive the second transmission gear 206 to rotate inside the shell 203, so that the second transmission gear 206 drives the ring gear 301 to rotate inside the limiting sleeve 108, and then adjusts the angle of the rotating device 300 to tilt the mold so that the wax liquid can be completely discharged to ensure the quality of the shell after making.

[0068] The edges of the gear ring 301 are fixedly connected to the two ends of several horizontal plates 302, wherein the inner walls of two horizontal plates 302 are fixedly connected with arc-shaped plates 303, and one of the gear rings 301 is fixedly connected with two L-shaped brackets 304, the two brackets 304 are symmetrically distributed on both sides of the gear ring 301, and the two brackets 304 are fixedly connected to the two ends of the side plates 305, the bottom of the bracket 304 is rotatably connected to the clamping plate 306, the surface of the clamping plate 306 is connected to the side plate 305 through an inclined spring 307, and the clamping plate 306 is connected to the side plate 305. Plate 306 is correspondingly arranged below the electric push rod 407107; a limiting mechanism is provided on the gear ring 301 and the cross plate 302, and the limiting mechanism includes a sleeve 308 and a pressure plate 311. The sleeve 308 is fixedly installed to the inner wall of the gear ring 301 and the inner wall of the cross plate 302. The bottom of the sleeve 308 is rotatably connected with a screw sleeve 309, and the interior of the screw sleeve 309 is threadedly sleeved with a threaded rod 310. The threaded rod 310 is movably sleeved with the interior of the sleeve 308, and the threaded rod 310 is fixedly connected to the top surface of the pressure plate 311.

[0069] In the present technical solution, the two gear rings 301 are connected by a cross plate 302, and the rotation angle of the gear ring 301 enables the cross plate 302 to move from one limit sleeve 108 to another limit sleeve 108, ensuring that the wax liquid can be discharged by tilting the mold. When the support plate 404 is pushed into the interior of the rotating device 300, the support block 409 at the bottom of the support plate 404 abuts against the sliding sleeve 401, and after the sliding sleeve 401 is pushed in, the support plate 404 contacts the clamping plate 306, so that the clamping plate 306 clamps the support plate 404 so that it cannot be pulled out, thereby achieving limited fixation.

[0070] The wax mold casting structure 500 is composed of a circular wax mold casting 501 and two risers 502 . An inwardly concave cutting line 503 is provided on the surface of the circular wax mold casting 501 between the two risers 502 .

[0071] In this technical solution, a circular wax mold casting 501 and two risers 502 are separately manufactured, and the risers 502 are bonded and fixed to the circular wax mold casting 501. A cutting line 503 is formed during manufacturing to perform precise cutting for the finished product to be subsequently cast and molded.

[0072] The bottom of the arc plate 303 is slidably connected with a positioning device 400, and the positioning device 400 includes a sliding sleeve 401 and a limiting plate 402. The number of the sliding sleeves 401 is two and the cross-section is a U-shaped structure. The sliding sleeve 401 is slidably connected to the bottom of the arc plate 303, and the limiting plate 402 is fixedly connected to the top of the sliding sleeve 401. The inner wall of the limiting plate 402 is provided with two horizontally distributed convex strips, and a support plate 404 is provided between the limiting plates 402 located inside the convex strips. The bottom of the support plate 404 is fixedly connected with a stop block 409, and the stop block 409 contacts the limit plate 402. The edges of both sides of the support plate 404 are provided with a plurality of sockets 408 for plugging in the riser 502, and one side of the support plate 404 is connected to the card Plate 306 is clamped; an adjustment mechanism is provided on the inner wall of the limit plate 402, and the adjustment is located on the upper convex surface, and the adjustment mechanism includes a worm 405 and a worm wheel 406, and the worm 405 is rotatably connected to the upper part of the convex, and the worm 405 is horizontally distributed and extends to the outside of the limit plate 402, and the side wall of the limit plate 402 is rotatably connected to the worm wheel 406, and the edge of the worm wheel 406 is fixedly connected to the push rod 407 of the L-shaped structure; the top of the limit plate 402 is rotatably connected to the positioning plate 403, and the positioning plate 403 is a bent structure and is arranged on the inner wall of the limit plate 402, and an adjustment mechanism is provided between the limit plate 402 and the positioning plate 403, and the inner wall of the positioning plate 403 is in contact with the push rod 407.

[0073] In the present technical solution, when taking materials, the driving device 200 is controlled to rotate the support plate 404 to a horizontal position, the side cover 105 is opened, the electric push rod 407107 is extended to push the clamping plate 306 to rotate it and then separate it from the support plate 404, the support plate 404 is pulled to move to move it out and drive the sliding sleeve 401 to move at the bottom of the arc plate 303, so that the support plate 404 is moved out of the kettle body 101, and the wax mold casting structure 500 is placed upside down on the support plate 404, so that the riser 502 is plugged into the inside of the socket 408 to realize placement, and then the worm 405 is rotated to drive the worm wheel 406 to rotate, and the worm gear 406 is rotated. The wheel 406 drives the push rod 407 to rotate. When one end of the worm wheel 406 rotates from a horizontal position to a vertical position, the end of the push rod 407 contacts the positioning rod, causing the positioning plate 403 to rotate around its top to clamp and fix both sides of the mold, thereby ensuring the positioning of the mold; after the mold is moved to the inside of the kettle body 101, the mold is located under the pressing plate 311. By rotating the screw sleeve 309 to drive the threaded rod 310 to rise and fall, the threaded rod 310 drives the pressing plate 311 to limit the top surface of the mold, so that it will not shake when adjusting the angle, thereby improving the production quality.

[0074] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A casting process for a semicircular casting, characterized in that: The process comprises the following steps: (1) molding, making a wax film integral circular casting, and two risers (502) of the same structure, the risers (502) having a size of L110xW100xH20mm, and arranged on the corresponding center line; (2) Assembling the tree, bonding two risers (502) to the surface of the casting to obtain a wax mold casting structure (500), leaving a 10 mm margin and a cutting line (503) at the circular casting between the two risers (502) to leave a cutting margin for later cutting and separating the castings to prevent the castings from being dug out; (3) Shell making: The module after the assembly tree is bonded is coated with a coating. The first three layers are silica sol coating, the surface layer is mullite sand 30-60 mesh, the second and third layers are mullite sand 16-30 mesh; the reinforcement layer is water glass coating, mullite sand 10-16 mesh, a total of 12 layers; (4) dewaxing, using a steam kettle device (100), the dewaxing temperature is ≥120°C, and the time is 35-40 minutes; (5) calcination, with the riser (502) facing downward, at a temperature of 950-1050° C. for a time of ≥90 min; (6) Pouring. When the composition is qualified, the ladle is aligned with the riser (502) 2 for pouring. The pouring temperature is 1550-1570° C. and the pouring time is 16-20 s. (7) Sand cleaning: Use electric pick to clean sand without impacting the casting surface; (8) Gas cutting the risers (502) to remove the two risers (502); (9) Heat treatment: normalizing and tempering; (10) Finishing, remove burrs and flash, and use wire cutting to cut into two parts before processing, without deformation, and without oxyacetylene flame cutting; (11) Inspection: inspect the size of the round casting according to the drawing requirements and perform RT inspection according to customer requirements (12) Result judgment: RT test meets customer standards, the size and surface flatness are within 1mm, and the casting is qualified.

2. The casting process of a semicircular casting according to claim 1, characterized in that: The steam kettle device (100) in step (4) is composed of a kettle body (101), the bottom of which is fixedly mounted with a support, a collecting tank (102) and a steam generator (103), the collecting tank (102) is communicated with the interior of the kettle body (101), and the top edge of the collecting tank (102) is fixedly connected to a guide plate (104), and the side wall of the kettle body (101) is rotatably connected with a side cover (105) for making For loading and unloading of the shell mold, a fixing frame (106) is fixedly installed on the surface of the kettle body (101) on the other side of the side cover (105), and the top of the fixing frame (106) is fixedly connected to the electric push rod (407) (107), and the telescopic end of the electric push rod (407) (107) passes through the kettle body (101) and extends to the inside of the kettle body (101), and the telescopic end of the electric push rod (407) (107) is sealed and sleeved with the kettle body (101).

3. The casting process of a semicircular casting according to claim 2, characterized in that: A driving device (200) is fixedly installed on the top of the steam kettle device (100), and the driving device (200) is composed of a driving motor (201) and a shell (203). The driving motor (201) is fixedly connected to the middle of the top of the kettle body (101), and the shell (203) is fixedly connected to both sides of the top of the kettle body (101) and communicated with the inside of the kettle body (101). The insides of the two shells (203) are respectively sealed and rotatably connected to the two ends of the rotating shaft (204), the middle of the rotating shaft (204) is fixedly connected to the first transmission gear (205), the output end of the driving motor (201) is fixedly connected to the driving gear (202), and the driving gear (202) is meshedly connected to the first transmission gear (205).

4. The casting process of a semicircular casting according to claim 2, characterized in that: A rotating device (300) is provided inside the steam kettle device (100), and the rotating device (300) is composed of a gear ring (301), and the gear ring (301) is in contact with the inner wall of the kettle body (101). There are two gear rings (301), and each gear ring (301) is located inside a plurality of limiting sleeves (108), and each limiting sleeve (108) is evenly distributed on the inner wall of the kettle body (101) and is fixedly connected to the kettle body (101). The gear ring (301) is meshedly connected with the second transmission gear (206), and the second transmission gear (206) is located inside the shell (203) and is fixedly connected to both ends of the rotating shaft (204).

5. The casting process of a semicircular casting according to claim 4, characterized in that: The edges of the gear ring (301) are respectively fixedly connected to the two ends of a plurality of transverse plates (302), wherein the inner walls of two transverse plates (302) are fixedly connected with arc-shaped plates (303), and two L-shaped brackets (304) are fixedly connected inside one of the gear rings (301), and the two brackets (304) are symmetrically distributed on both sides of the gear ring (301), and the two brackets (304) are respectively fixedly connected to the two ends of the side plates (305), and the bottom of the bracket (304) is rotatably connected to the card plate (306), and the surface of the card plate (306) is connected to the side plate (305) through an inclined spring (307), and the card plate (306) is correspondingly arranged below the electric push rod (407) (107).

6. The casting process of a semicircular casting according to claim 5, characterized in that: The gear ring (301) and the cross plate (302) are both provided with a limiting mechanism, and the limiting mechanism comprises a sleeve (308) and a pressure plate (311). The sleeve (308) is fixedly mounted to the inner wall of the gear ring (301) and the inner wall of the cross plate (302). The bottom of the sleeve (308) is rotatably connected with a screw sleeve (309). The interior of the screw sleeve (309) is threadedly sleeved with a threaded rod (310). The threaded rod (310) is movably sleeved with the interior of the sleeve (308), and the threaded rod (310) is fixedly connected to the top surface of the pressure plate (311).

7. The casting process of a semicircular casting according to claim 2, characterized in that: The wax mold casting structure (500) consists of a circular wax mold casting (501) and two risers (502), and a concave cutting line (503) is provided on the surface of the circular wax mold casting (501) between the two risers (502).

8. The casting process of a semicircular casting according to claim 5, characterized in that: The bottom of the arc-shaped plate (303) is slidably connected with a positioning device (400), and the positioning device (400) comprises a sliding sleeve (401) and a limiting plate (402). The number of the sliding sleeves (401) is two and the cross-sections of both are U-shaped structures. The sliding sleeve (401) is slidably connected with the bottom of the arc-shaped plate (303), and the limiting plate (402) is fixedly connected with the top of the sliding sleeve (401). The inner wall of the limiting plate (402) is provided with two horizontally distributed convex strips, and a support plate (404) is provided between the limiting plates (402) located inside the convex strips. The bottom of the supporting plate (404) is fixedly connected with a stop block (409), and the stop block (409) contacts the limiting plate (402). The edges of both sides of the supporting plate (404) are provided with a plurality of sockets (408) for plugging in the riser (502), and one side of the supporting plate (404) is clamped with the clamping plate (306).

9. The casting process of a semicircular casting according to claim 8, characterized in that: The inner wall of the limit plate (402) is provided with an adjustment mechanism, and the adjustment is located on the upper convex strip surface. The adjustment mechanism includes a worm (405) and a worm wheel (406). The worm (405) is rotatably connected to the upper part of the convex strip. The worm (405) is horizontally distributed and extends to the outside of the limit plate (402). The side wall of the limit plate (402) is rotatably connected to the worm wheel (406), and the edge of the worm wheel (406) is fixedly connected to the push rod (407) of the L-shaped structure.

10. The casting process of a semicircular casting according to claim 9, characterized in that: The top of the limiting plate (402) is rotatably connected to the positioning plate (403); the positioning plate (403) is a bent structure and is arranged on the inner wall of the limiting plate (402); an adjustment mechanism is provided between the limiting plate (402) and the positioning plate (403), and the inner wall of the positioning plate (403) is in contact with the push rod (407).

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