Crankcase and casting method thereof

Abstract

The invention relates to the technical field of crankcases, in particular to a crankcase and a casting method thereof. Comprising a processing table; casting mold; the casting mold is provided with two casting cavities; the cross gate is positioned between the two casting cavities; the two casting cavities are symmetrically arranged by taking the cross gate as a symmetry axis; inner sprues are formed in the two sides of the cross gate; the flow gate is connected with the casting cavity and is communicated with the casting cavity; the cross gate is communicated with the flow gate; the straight pouring gate is mounted on the transverse pouring gate and is communicated with the transverse pouring gate; the sprue cup is mounted at one end, far away from the cross gate, of the sprue; the sprue cup is communicated with the sprue; a box body is arranged on the processing table; the casting mold is placed on the bottom sand in the box body and is used for casting production; by means of the technical scheme, when the crankcase is produced and cast, two castings can be synchronously produced and cast, the casting efficiency is improved, and the limitation in the casting process is reduced.

Description

Technical Field

[0001] This invention relates to the field of crankcase technology, specifically to a crankcase and its casting method. Background Technology

[0002] The crankcase is the part of the engine cylinder block where the crankshaft is mounted, and it is divided into the upper crankcase and the lower crankcase. The upper crankcase is usually cast as a single piece with the cylinder block, while the lower crankcase mainly serves to store lubricating oil and seal the upper structure. Currently, crankcases are typically produced individually during casting, making simultaneous operation impossible. This not only reduces casting efficiency but also imposes significant limitations on the casting process. Summary of the Invention

[0003] This invention addresses the technical problems existing in the prior art by providing a crankcase and its casting method, effectively solving the problems mentioned in the background art.

[0004] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a crankcase, including a machining table; a casting mold; the casting mold is provided with two casting cavities; A horizontal sprue is located between two casting cavities; the two casting cavities are symmetrically arranged about the horizontal sprue as an axis of symmetry; ingates are provided on both sides of the horizontal sprue; the ingates are connected to the casting cavities and the two communicate with each other; the horizontal sprue and the ingates communicate with each other; The straight pouring runner is installed on the horizontal pouring runner, and the two are connected. The pouring cup is installed at the end of the sprue away from the runner; the pouring cup is connected to the sprue.

[0005] Preferably, the processing table is provided with a box; the mold is placed on the bottom sand inside the box for casting production; the bottom sand height is 100-200mm, and the bottom sand is scraped into a flat surface.

[0006] Preferably, the sprue is cylindrical with a diameter of 30 mm and a length of 400 mm in the vertical direction; the top opening of the main body of the pouring cup has a diameter of 140 mm and a height of 150 mm; the interface connecting the pouring cup and the sprue has a diameter of 30 mm.

[0007] Preferably, the runner is a square column with a cross-sectional dimension of 30mm×30mm and a horizontal length of 265mm; the ingate has a cross-sectional dimension of 30mm×30mm and a length of 30mm; the interface diameter connecting the ingate to the casting cavity and the runner is 5-6mm.

[0008] The present invention also provides a method for casting a crankcase, used for machining a crankcase, comprising the following steps: S1: The housing is fixedly installed on the top of the processing table using a flexible control unit for replacing housings of different sizes; S2: Place bottom sand inside the box, place the mold on the bottom sand, and scrape the bottom sand into a flat surface; S3: Then continue to fill the box with sand, using a flexible manual method to add sand to the required height. Then remove the fixing wooden strips, plastic ropes and foam blocks to ensure that there are no foreign objects in the molding sand. Next, vibrate for 20 seconds, with the vibration frequency set to 44HZ. After that, continue to fill the sand evenly until it is flush with the sprue of the mold. Scrape the molding sand on the inner and outer sides, and then vibrate for 30 seconds, keeping the vibration frequency at 44HZ. S4: Cover the molding sand surface with plastic film, then fill with top sand, the thickness of which is greater than 50mm; compact the plastic film and top sand to ensure that the surface of the pouring cup is 20mm higher than the surface of the top sand; then cut open the plastic film on the top surface of the pouring cup to expose the pouring cup, and ensure that there is no residual molding sand on the top surface of the pouring cup; finally, scrape the surface of the top sand smooth. S5: The casting of the crankcase is completed by pouring molten metal into the pouring cup. The molten metal enters the casting cavity through the sprue, runner and ingate in sequence. After the molten metal cools and solidifies, the casting of the crankcase is completed.

[0009] Preferably, the pouring temperature of the metal slurry is 1480-1500℃; the pouring negative pressure is -0.045-0.055MPa; and after pouring, the casting cavity inside the box is held under pressure for 12-15 minutes.

[0010] Preferably, the elastic positioning unit includes a positioning cylinder; one end of the positioning cylinder is connected to the side of the housing near the processing table; the other end of the positioning cylinder passes through the top of the processing table and extends to the bottom of the processing table; the positioning cylinder and the processing table are slidably engaged; the outer wall of the positioning cylinder is provided with several equidistantly arranged locking slots; the bottom of the processing table is provided with a guide groove; two guide grooves are symmetrically arranged about the positioning cylinder as an axis of symmetry; a guide slider is slidably connected in the guide groove; a guide cylinder is installed in the guide groove, and the guide cylinder and the guide slider are connected through each other and slidably engaged; a guide spring is sleeved on the guide cylinder; one end of the guide spring is fixedly connected to the guide groove, and the other end is fixedly connected to the guide slider; a locking rod is installed on the side of the guide slider near the positioning cylinder; one of the locking slots is located in the movement path of the locking rod.

[0011] Preferably, the top of the processing table is provided with a through-type limiting slide column, and the two slide in cooperation; a limiting square plate is installed on the end of the limiting slide column away from the box body; the limiting square plate is located at the bottom of the processing table; the side of the limiting square plate near the bottom of the processing table is located at the moving path of the positioning cylinder; a limiting spring is sleeved on the limiting slide column; one end of the limiting spring is fixedly connected to the bottom of the processing table, and the other end is fixedly connected to the limiting square plate.

[0012] Preferably, the guide slider is provided with a relative buffer; the relative buffer includes a fixed seat, which is fixedly connected to the guide slider; and a fixed pulley is installed on the side of the processing table. A double-ended lead screw is mounted on the top of the machining table; a retaining base is installed on the double-ended lead screw; the retaining base is connected to the top of the machining table; a winding wheel is installed at the middle position of the double-ended lead screw; a spring is connected to the double-ended lead screw; the end of the spring is connected to the retaining base. The cable is connected to the fixed seat at one end, and the other end is wound around the winding wheel after passing over the fixed pulley. A retaining block; two retaining blocks are symmetrically threaded onto a double-ended lead screw; a retaining slide is installed on the retaining base; the retaining blocks and the retaining slide are connected through each other and slide in fit; a resistance plate is installed on the retaining block; two resistance plates are located on both sides of the housing.

[0013] Preferably, a resistance cylinder is connected through the resistance square plate near the box body; the resistance cylinder and the resistance square plate are slidably fitted; a resistance block is installed at the end of the resistance cylinder near the box body; a rubber buffer pad is provided on the side of the resistance block away from the resistance cylinder; the side of the box body is located in the movement path of the rubber buffer pad; a resistance spring is sleeved on the resistance cylinder; one end of the resistance spring is fixedly connected to the resistance block, and the other end is fixedly connected to the resistance square plate.

[0014] The beneficial effects of this invention are: when producing a cast crankcase, it enables two castings to be produced and cast simultaneously, which not only improves casting efficiency but also reduces the limitations of casting. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the horizontal gating structure of the present invention; Figure 2 This is a schematic diagram of the casting cavity structure of the present invention; Figure 3 This is a schematic diagram of the direct casting channel structure of the present invention; Figure 4 This is a schematic diagram of the ingate structure of the present invention; Figure 5 This is a schematic diagram of the box structure of the present invention; Figure 6 This is an exploded view of the positioning cylinder of the present invention; Figure 7 This is a schematic diagram of the fixed pulley structure of the present invention; Figure 8 This is a schematic diagram of the resistance block structure of the present invention; Figure 9 This is a schematic diagram of the limiting square plate structure of the present invention; Figure 10 This is a schematic diagram of the winding wheel structure of the present invention; Figure 11 This is a schematic diagram of the locking rod structure of the present invention; The attached diagram lists the components represented by each number as follows: 1. Casting cavity; 2. Horizontal runner; 3. Ingate; 4. Straight runner; 5. Pour cup; 6. Housing; 7. Machining table; 8. Positioning cylinder; 9. Locking slot; 10. Guide groove; 11. Guide slider; 12. Guide cylinder; 13. Guide spring; 14. Locking rod; 15. Limiting slide; 16. Limiting square plate; 17. Limiting spring; 18. Fixing square seat; 19. Fixed pulley; 20. Double-ended lead screw; 21. Fixing base; 22. Winding wheel; 23. Clock spring; 24. Cable; 25. Fixing block; 26. Fixing slide; 27. Resistance square plate; 28. Resistance cylinder; 29. ​​Resistance block; 30. Rubber buffer pad; 31. Resistance spring. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0018] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0019] Implementation examples, by Figures 1 to 11The present invention includes a processing table 7; a mold; the mold having two casting cavities 1; a sprue 2 located between the two casting cavities 1; the two casting cavities 1 being symmetrically arranged about the sprue 2 as an axis of symmetry; ingates 3 on both sides of the sprue 2; the ingates 3 being connected to and communicating with the casting cavities 1; the sprue 2 and the ingates 3 being interconnected; a sprue 4 installed on the sprue 2 and connected to it; a pouring cup 5 installed at the end of the sprue 4 away from the sprue 2; the pouring cup 5 and the sprue 4 being interconnected; a box 6 provided on the processing table 7; the mold being placed on the bottom sand inside the box 6 for casting production; the bottom sand height being 100 mm. -200mm, and scrape the bottom sand into a flat surface; the sprue 4 is cylindrical; its diameter is 30mm, and its length in the vertical direction is 400mm; the top opening diameter of the main body of the pouring cup 5 is 140mm, and its height is 150mm; the diameter of the interface connecting the pouring cup 5 and the sprue 4 is 30mm; the runner 2 is square columnar, its cross-sectional dimensions are 30mm×30mm, and its length in the horizontal direction is 265mm; the cross-sectional dimensions of the ingate 3 are 30mm×30mm, and its length is 30mm; the diameter of the interface connecting the ingate 3 and the casting cavity 1 and the runner 2 is 5-6mm; The present invention also provides a method for casting a crankcase, used for machining a crankcase, comprising the following steps: S1: The housing 6 is fixedly installed on the top of the processing table 7 using the elastic control unit, for replacing housings 6 of different sizes; S2: Place bottom sand inside box 6, place the mold on the bottom sand, and scrape the bottom sand into a flat surface; S3: Then continue to fill the box 6 with sand, using a flexible manual method to add sand to the required height. Then remove the fixing wooden strips, plastic ropes and foam blocks to ensure that there are no foreign objects in the molding sand. Next, vibrate for 20 seconds, with the vibration frequency set to 44HZ. Then continue to fill the sand evenly until it is flush with the sprue 4 of the mold. Scrape the molding sand on the inner and outer sides, and then vibrate for 30 seconds, keeping the vibration frequency at 44HZ. S4: Cover the molding sand surface with plastic film, then fill with top sand, the thickness of which is greater than 50mm; compact the plastic film and top sand to ensure that the surface of the pouring cup 5 is 20mm higher than the surface of the top sand; then cut open the plastic film on the top surface of the pouring cup 5 to expose the pouring cup, and ensure that there is no residual molding sand on the top surface of the pouring cup 5; finally, scrape the surface of the top sand smooth. S5: By pouring the casting slurry into the pouring cup 5, the slurry enters the casting cavity 1 through the sprue 4, the glide sprue 2 and the ingate 3 in sequence. After the slurry cools and solidifies, the casting of the crankcase is completed. When pouring the molten metal, the pouring temperature is 1480-1500℃; the pouring negative pressure is -0.045-0.055MPa; and after pouring, the casting cavity 1 inside the box 6 is held under pressure for 12-15 minutes. When casting the crankcase, the housing 6 is fixedly installed on the top of the machining table 7 using an elastic positioning unit. Then, bottom sand is placed inside the housing 6, and the mold is placed on top of the bottom sand. The bottom sand is then scraped flat. Next, sand is added to the housing 6 using a flexible manual sand-adding method until the required height is reached. The fixing wooden strips, plastic ropes, and foam blocks used to position the mold are then removed to ensure the molding sand is free of debris. Vibration is then performed for 20 seconds at a frequency of 44 Hz. Sand is then added evenly until it is flush with the sprue 4 of the mold. The inner and outer molding sand are scraped flat, and vibration is performed again for 30 seconds, maintaining the frequency at 44 Hz. A plastic film is then placed over the molding sand surface, followed by top sand, with a thickness greater than 50 mm. The plastic film and top sand are compacted, ensuring that the surface of the pouring cup 5 is 20 mm higher than the surface of the top sand. The plastic film on the top surface of the pouring cup 5 is then cut open to expose the pouring cup, ensuring that there is no residual molding sand on the top surface of the pouring cup 5. Finally, the top sand is... The sand surface is smoothed; then, molten metal for casting is poured into the pouring cup 5. The molten metal flows sequentially through the sprue 4, the grate 2, and the ingate 3 into the casting cavity 1. After the molten metal cools and solidifies, the casting of the crankcase is completed. At the same time, the pouring temperature of the molten metal is 1480-1500℃, and the pouring negative pressure is -0.045-0.055MPa. After pouring, the casting cavity 1 in the housing 6 is held under pressure for 12-15 minutes. The mold has two casting cavities 1. The molten metal entering the grate 2 enters the two casting cavities 1 through the ingates 3 on both sides, allowing two castings to be produced and cast simultaneously. This avoids the crankcase being produced only once, thus improving the production efficiency of the crankcase. This allows the two castings to be produced and cast simultaneously, which not only improves the casting efficiency but also reduces the limitations of the casting process.

[0020] The elastic positioning unit of this embodiment includes a positioning cylinder 8; one end of the positioning cylinder 8 is connected to the side of the housing 6 near the processing table 7; the other end of the positioning cylinder 8 passes through the top of the processing table 7 and extends to the bottom of the processing table 7; the positioning cylinder 8 and the processing table 7 are slidably engaged; the outer wall of the positioning cylinder 8 is provided with a plurality of equally spaced locking slots 9; the bottom of the processing table 7 is provided with a guide groove 10; two guide grooves 10 are symmetrically arranged about the positioning cylinder 8 as an axis of symmetry; a guide slider 11 is slidably connected in the guide groove 10; a guide cylinder 12 is installed in the guide groove 10, and the guide cylinder 12 and the guide slider 11 are connected through each other and slidably engaged; a guide spring 13 is sleeved on the guide cylinder 12; the guide spring... One end of the spring 13 is fixedly connected to the guide slide 10, and the other end is fixedly connected to the guide slider 11; a locking rod 14 is installed on the side of the guide slider 11 near the positioning cylinder 8; one of the locking slots 9 is located in the moving path of the locking rod 14; a through limiting slide 15 is provided on the top of the processing table 7, and the two slide in cooperation; a limiting square plate 16 is installed on the end of the limiting slide 15 away from the box 6; the limiting square plate 16 is located at the bottom of the processing table 7; the side of the limiting square plate 16 near the bottom of the processing table 7 is located in the moving path of the positioning cylinder 8; a limiting spring 17 is sleeved on the limiting slide 15; one end of the limiting spring 17 is fixedly connected to the bottom of the processing table 7, and the other end is fixedly connected to the limiting square plate 16; The crankcase requires a housing 6 during casting, which may include, but is not limited to, an embedded housing or a lost foam sand housing. However, depending on different casting conditions, requirements, and specifications, different sizes of housing 6 may be needed during the casting process. In this case, the positioning cylinder 8 at the bottom of the housing 6 is aligned with the slot on the top of the machining table 7, allowing the positioning cylinder 8 to pass through the top of the machining table 7 and contact the limiting square plate 16 at its bottom. This allows the positioning cylinder 8 to be limited in its movement at the machining table 7 via the limiting slide 15, keeping the limiting spring 17 in a buffered state. After the housing 6 is lowered to the required height, the guide slider 11, which was originally pulling outwards, is released, allowing the housing 6 to move further outwards. When the guide spring 13 is reset in its buffer state, it can drive the locking rod 14 on the guide slider 11 to reset, connecting it with one of the locking slots 9 on the positioning cylinder 8. This limits the positioning cylinder 8 to its current height position, thereby completing the installation operation of the housing 6. This prevents the housing 6 from shifting or shaking due to non-human factors during the casting of the crankcase, improving the stability of the housing 6 during use and also enhancing the casting effect of the housing 6. It is worth mentioning that the number of locking slots 9 is set in a certain way, and they are all equally spaced, so that the housing 6 can be adjusted according to different casting requirements and the different heights of the workers. The height of the housing 6 is adjusted to avoid significant height differences between the workers and the housing 6, which could affect the casting operation and reduce casting limitations. Simultaneously, when the housing 6 is installed at its current height, the limiting plate 16 cannot return to its original position, preventing the limiting spring 17 from returning to its original position. The resulting resistance acts on the positioning cylinder 8, increasing the contact strength and friction between the locking slot 9 and the locking rod 14. This prevents the locking rod 14 from dislodging due to non-human factors when positioning the positioning cylinder 8, thus improving the casting and usage performance of the housing 6. Furthermore, when it is necessary to disassemble the housing 6 or perform other operations... During maintenance, by pulling the guide slider 11 outward, it is limited to move at the guide groove 10 and the guide cylinder 12, so that the guide spring 13 is in a buffer state. Then, the locking rod 14 on the guide slider 11 is no longer connected to the locking slot 9, thereby releasing the limiting setting on the positioning cylinder 8. This allows the limiting plate 16 to no longer be limited. The limiting spring 17, which is in a buffer state, resets and synchronously drives the limiting plate 16 to reset and move. The resulting elastic force acts on the positioning cylinder 8, which helps the box 6 move away from the processing table 7, so that the box 6 can be pulled out of the processing table 7, thereby completing the disassembly operation of the box 6.It is worth mentioning that the installation and disassembly of housing 6 can be completed without any tools, making the process convenient and quick. This reduces the workload of staff and improves the ease of installation and disassembly of housing 6. It avoids difficulties in disassembling and installing housing 6 due to the lack of suitable tools when needing to replace housing 6 with different sizes or when maintenance is required during use. This reduces the limitations of housing 6 in casting and use, and also allows staff to easily replace housing 6 with different sizes according to different casting conditions and needs. This ensures that housing 6 is compatible with casting specifications, meets process parameter requirements, and is suitable for production equipment and efficiency requirements, thus improving the casting effect of the crankcase.

[0021] In this embodiment, a relative buffer is provided on the guide slider 11; the relative buffer includes a retaining seat 18, which is fixedly connected to the guide slider 11; a fixed pulley 19 is installed on the side of the processing table 7; a double-ended lead screw 20 is provided on the top of the processing table 7; a retaining base 21 is installed on the double-ended lead screw 20; the retaining base 21 is connected to the top of the processing table 7; a winding wheel 22 is installed at the middle position of the double-ended lead screw 20; a spring 23 is connected to the double-ended lead screw 20; the end of the spring 23 is connected to the retaining base 21; a cable 24 is connected at one end to the retaining seat 18, and the other end is wound around the winding wheel 22 after passing over the fixed pulley 19; a retaining block 25; two retaining blocks 25 are symmetrically threadedly connected to the double-ended lead screw 20; A fixed base 21 is equipped with a fixed sliding column 26; a fixed block 25 and a fixed sliding column 26 are connected through each other and slide in fit; a resistance square plate 27 is installed on the fixed block 25; two resistance square plates 27 are located on both sides of the box 6; a resistance cylinder 28 is connected through the resistance square plate 27 on the side closer to the box 6; the resistance cylinder 28 and the resistance square plate 27 slide in fit; a resistance elongated block 29 is installed on the end of the resistance cylinder 28 closer to the box 6; a rubber buffer pad 30 is provided on the side of the resistance elongated block 29 away from the resistance cylinder 28; the side of the box 6 is located in the movement path of the rubber buffer pad 30; a resistance spring 31 is sleeved on the resistance cylinder 28; one end of the resistance spring 31 is fixedly connected to the resistance elongated block 29 and the other end is fixedly connected to the resistance square plate 27; When the guide slider 11 is pulled outward, the retaining seat 18 is moved synchronously. Under the action of the cable 24 and the fixed pulley 19, the winding wheel 22 is reset and rotated under the action of the spring spring 23 in the reset state, rewinding the cable 24. This causes the double-ended lead screw 20 on the winding wheel 22 to reset and rotate. Because the two threads on it are set in opposite directions, the two retaining blocks 25 connected by the threads of the double-ended lead screw 20 move in opposite directions at the retaining slide column 26. This causes the resistance plate 27 on the retaining block 25 to move away from the housing 6. Under the action of the resistance cylinder 28 and the resistance spring 31, the resistance plate 27 drives the resistance block 29 to move. The guide spring 13 moves away from the housing 6, no longer contacting it, thus releasing the limiting setting on the housing 6 and allowing it to be disassembled or installed normally. After the housing 6 is installed, when the guide slider 11 is released to limit and fix the housing 6, the guide spring 13, being stronger than the spring 23, causes the guide spring 13 to return, pulling the guide slider 11 to return, causing the retaining block 18 on it to return, which, under the action of the cable 24 and the fixed pulley 19, pulls the winding wheel 22 to return to rotation, putting the spring 23 in a buffer state. This causes the double-ended lead screw 20 to rotate, causing the two threaded retaining blocks 25 to be fixed in place by the retaining slide column 2. The upper limit of position 6 moves relative to each other, causing the two resistance square plates 27 to move relative to each other, that is, to move closer to the box body 6. Under the action of the resistance cylinder 28 and the resistance spring 31, the resistance square plates 27 drive the resistance long blocks 29 to move closer to and make contact with the box body 6. This ensures that there are resistance long blocks 29 in contact on both sides of the box body 6, which further clamps and sets the box body 6 fixed at the current height, preventing the box body 6 from shaking or dislodging during casting, and further improving the installation effect of the box body 6, thus improving its use and casting effect. At the same time, when the resistance long blocks 29 contact the side wall of the box body 6, the rubber buffer pads 30 on the resistance long blocks 29 also contact the box body 6, thereby increasing the... The increased frictional force in contact with the housing 6, coupled with the continued rotation of the double-ended lead screw 20, causes the resistance square plate 27 to move at the resistance cylinder 28, thus placing the resistance spring 31 in a buffered state. This further increases the contact strength with the housing 6, preventing dislocation or displacement of the housing 6 due to non-human factors during clamping, thereby improving the casting effect of the housing 6. Simultaneously, the buffering force provided by the resistance spring 31 and the rubber buffer pad 30 absorbs the impact force generated by the shaking of the housing 6 during casting, improving the stability and service life of the housing 6 during use, and preventing damage caused by large impacts during casting, thus improving the casting effect of the crankcase.

[0022] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A crankcase, characterized in that: Includes a processing table; a casting mold; the casting mold has two casting cavities; A horizontal sprue is located between two casting cavities; the two casting cavities are symmetrically arranged about the horizontal sprue as an axis of symmetry; ingates are provided on both sides of the horizontal sprue; the ingates are connected to the casting cavities and the two communicate with each other; the horizontal sprue and the ingates communicate with each other; The straight pouring runner is installed on the horizontal pouring runner, and the two are connected. The pouring cup is installed at the end of the sprue away from the runner; the pouring cup is connected to the sprue.

2. A crankcase according to claim 1, characterized in that: The processing table is equipped with a box; the mold is placed on the bottom sand inside the box for casting production; the bottom sand height is 100-200mm, and the bottom sand is scraped into a flat surface.

3. A crankcase according to claim 1, characterized in that: The sprue is cylindrical with a diameter of 30mm and a vertical length of 400mm. The top opening of the main body of the pouring cup has a diameter of 140mm and a height of 150mm. The interface connecting the pouring cup and the sprue has a diameter of 30mm.

4. A crankcase according to claim 1, characterized in that: The horizontal runner is a square column with a cross-sectional dimension of 30mm×30mm and a horizontal length of 265mm; the ingate has a cross-sectional dimension of 30mm×30mm and a length of 30mm; the interface diameter connecting the ingate to the casting cavity and the horizontal runner is 5-6mm.

5. A method for casting a crankcase, comprising machining a crankcase as described in any one of claims 1-4, characterized in that, Including the following steps: S1: The housing is fixedly installed on the top of the processing table using a flexible control unit for replacing housings of different sizes; S2: Place bottom sand inside the box, place the mold on the bottom sand, and scrape the bottom sand into a flat surface; S3: Then continue to fill the box with sand, using a flexible manual method to add sand to the required height. Then remove the fixing wooden strips, plastic ropes and foam blocks to ensure that there are no foreign objects in the molding sand. Next, vibrate for 20 seconds, with the vibration frequency set to 44HZ. After that, continue to fill the sand evenly until it is flush with the sprue of the mold. Scrape the molding sand on the inner and outer sides, and then vibrate for 30 seconds, keeping the vibration frequency at 44HZ. S4: Cover the molding sand surface with plastic film, then fill with top sand, the thickness of which is greater than 50mm; compact the plastic film and top sand to ensure that the surface of the pouring cup is 20mm higher than the surface of the top sand; then cut open the plastic film on the top surface of the pouring cup to expose the pouring cup, and ensure that there is no residual molding sand on the top surface of the pouring cup; finally, scrape the surface of the top sand smooth. S5: The casting of the crankcase is completed by pouring molten metal into the pouring cup. The molten metal enters the casting cavity through the sprue, runner and ingate in sequence. After the molten metal cools and solidifies, the casting of the crankcase is completed.

6. The method for casting a crankcase according to claim 5, characterized in that: When the metal slurry is poured, the pouring temperature is 1480-1500℃; the pouring negative pressure is -0.045-0.055MPa; and after pouring, the casting cavity inside the box is held under pressure for 12-15 minutes.

7. The method for casting a crankcase according to claim 5, characterized in that: The elastic positioning unit includes a positioning cylinder; one end of the positioning cylinder is connected to the side of the housing near the processing table; the other end of the positioning cylinder passes through the top of the processing table and extends to the bottom of the processing table; the positioning cylinder and the processing table are slidably engaged; the outer wall of the positioning cylinder is provided with several equidistantly arranged locking slots; the bottom of the processing table is provided with a guide groove; two guide grooves are symmetrically arranged about the positioning cylinder as an axis of symmetry; a guide slider is slidably connected in the guide groove; a guide cylinder is installed in the guide groove, and the guide cylinder and the guide slider are connected through each other and slidably engaged; a guide spring is sleeved on the guide cylinder; one end of the guide spring is fixedly connected to the guide groove, and the other end is fixedly connected to the guide slider; a locking rod is installed on the side of the guide slider near the positioning cylinder; one of the locking slots is located in the moving path of the locking rod.

8. The method for casting a crankcase according to claim 7, characterized in that: The top of the processing table is provided with a through-type limiting slide column, which slides in conjunction with the limiting slide column; a limiting square plate is installed at the end of the limiting slide column away from the box body; the limiting square plate is located at the bottom of the processing table; the side of the limiting square plate near the bottom of the processing table is located at the moving path of the positioning cylinder; a limiting spring is sleeved on the limiting slide column; one end of the limiting spring is fixedly connected to the bottom of the processing table, and the other end is fixedly connected to the limiting square plate.

9. A method for casting a crankcase according to claim 7, characterized in that: The guide slider is provided with a relative buffer component; the relative buffer component includes a fixed seat, which is fixedly connected to the guide slider; a fixed pulley is installed on the side of the processing table. A double-ended lead screw is mounted on the top of the machining table; a retaining base is installed on the double-ended lead screw; the retaining base is connected to the top of the machining table; a winding wheel is installed at the middle position of the double-ended lead screw; a spring is connected to the double-ended lead screw; the end of the spring is connected to the retaining base. The cable is connected to the fixed seat at one end, and the other end is wound around the winding wheel after passing over the fixed pulley. A retaining block; two retaining blocks are symmetrically threaded onto a double-ended lead screw; a retaining slide is installed on the retaining base; the retaining blocks and the retaining slide are connected through each other and slide in fit; a resistance plate is installed on the retaining block; two resistance plates are located on both sides of the housing.

10. A method for casting a crankcase according to claim 9, characterized in that: A resistance cylinder is connected through the resistance square plate near the box body; the resistance cylinder and the resistance square plate are slidably fitted; a resistance block is installed at the end of the resistance cylinder near the box body; a rubber buffer pad is provided on the side of the resistance block away from the resistance cylinder; the side of the box body is located in the movement path of the rubber buffer pad; a resistance spring is sleeved on the resistance cylinder; one end of the resistance spring is fixedly connected to the resistance block, and the other end is fixedly connected to the resistance square plate.

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