Core assembly jig, and method of casting an intake manifold

Abstract

The application discloses a kind of group core mould, air intake machine case sand mould casting method, when carrying out sand core combination, first multiple sand cores are combined to group core mould to form integrated combined sand core, then again combined to sand box, greatly reduce the cumulative error generated in sand box one by one sand core combination, greatly improve the stability and combination positioning accuracy of integrated sand core combination, so as to improve the dimensional accuracy of air intake machine case casting.And, by locking lever and nut cooperation No.1 sand core, No.2 sand core and sand core positioning core head are locked to form fastening connection, prevent integrated combined sand core from appearing loose in the process of combination to sand box, before carrying out metal liquid pouring, remove nut and unload group core mould, then screw nut to locking lever and lock on No.2 sand core, through the locking effect of locking lever and nut and the gravity effect of sand core itself, completely solve the problem of sand core floating in the process of metal liquid pouring, further improve the dimensional accuracy of air intake machine case casting.

Description

Technical Field

[0001] This invention relates to the field of intake casing sand casting technology, and in particular to a core assembly jig. Furthermore, it also relates to an intake casing sand casting method using the aforementioned core assembly jig. Background Technology

[0002] Currently, intake casings are typically made of aluminum-magnesium alloy using sand casting. Due to the complex internal structure of intake casing castings, including multiple cavities and spatial piping, they cannot be formed entirely by sand casting. Instead, multiple sand cores are typically created by parting the mold. These sand cores are then assembled in a specific order, like building blocks, to form the casing's cavities and piping. Molten metal then flows and solidifies between the channels formed by the multiple sand cores, ultimately resulting in a complete intake casing casting. For example... Figures 1a to 1e As shown, a certain intake casing casting is disassembled into five parts: No. 1 sand core, No. 2 sand core, No. 1 oil pipe sand core, No. 2 oil pipe sand core, and No. 3 oil pipe sand core. Multiple sand cores are positioned together through the positioning holes on the sand cores and the cooperation of the positioning core heads. Specifically, as shown... Figure 2 As shown, during the sand core assembly, the sand box is assembled first. Then, the lower positioning head of the No. 1 sand core is aligned with the positioning hole on the sand box to assemble the No. 1 sand core onto the sand box. Next, the upper positioning head of the No. 1 sand core is aligned with the positioning hole on the small end of the No. 2 sand core to assemble the No. 2 sand core onto the No. 1 sand core. Finally, the No. 1 oil pipe sand core, the No. 2 oil pipe sand core, and the No. 3 oil pipe sand core are sequentially assembled onto the No. 1 sand core and the No. 2 sand core to complete the sand core assembly.

[0003] However, the current sand core assembly process involves assembling multiple sand cores one by one on a sand box. This process leads to a continuous accumulation of assembly errors, resulting in a large cumulative error in the overall sand core assembly. Consequently, the stability and accuracy of the overall sand core assembly are poor, leading to poor dimensional accuracy of the intake casing casting. Furthermore, the process-required gaps between sand cores during assembly cause them to float during molten metal pouring. This floating further amplifies the sand core assembly error, further deteriorating the dimensional accuracy of the intake casing casting. Summary of the Invention

[0004] This invention provides a core assembly jig and an intake casing sand casting method to solve the technical problem of poor dimensional accuracy of existing intake casing castings.

[0005] According to one aspect of the present invention, a core assembly jig is provided for assembling sand cores during the sand casting process of an intake casing. The intake casing casting is divided into a No. 1 sand core, a No. 2 sand core, a No. 1 oil pipe sand core, a No. 2 oil pipe sand core, and a No. 3 oil pipe sand core. The core assembly jig includes a base plate, a sand core support platform, a locking rod, and a nut. The sand core support platform is disposed on the base plate, and a sand core positioning head is disposed on the sand core support platform. The No. 2 sand core is centered by engaging with the sand core positioning head through a large-end positioning hole, and the large end of the No. 2 sand core abuts against the sand core support platform. The No. 1 sand core is positioned by engaging with the small-end positioning hole of the No. 2 sand core through an upper positioning head. The No. 1 oil pipe sand core and the No. 2 oil pipe... The sand core and the No. 3 oil pipe sand core are combined and positioned by their respective positioning core heads engaging with the positioning holes on the No. 1 and No. 2 sand cores. The sand core support platform and the sand core positioning core head are hollow structures. After all the sand cores are assembled, the locking rod is passed through the No. 1 sand core, the No. 2 sand core, and the sand core positioning core head in sequence and then locked with a nut. The upper end of the locking rod is pressed against the No. 1 sand core, and the nut is pressed against the sand core positioning core head. Then the core assembly jig is flipped over and placed on the sand box, and the lower positioning core head of the No. 1 sand core is engaged with the positioning hole on the sand box for positioning. Before pouring the molten metal, the nut is removed and the core assembly jig is unloaded. Then the nut is screwed onto the locking rod and locked onto the No. 2 sand core.

[0006] Furthermore, the base plate is also provided with two oil pipe support columns, which serve to support and lift the No. 1 oil pipe sand core and the No. 3 oil pipe sand core during assembly.

[0007] Furthermore, the base plate is also provided with a sand core support column, which is used to support the cantilever arm of the No. 2 sand core and cooperates with the sand core positioning head to prevent the No. 2 sand core from rotating, so as to ensure accurate angular positioning.

[0008] Furthermore, the base plate is also provided with positioning pin holes, which are used to cooperate with the positioning pins on the sand box for positioning, so as to ensure the center positioning accuracy and angular positioning accuracy when the overall assembled sand core is assembled with the sand box.

[0009] Furthermore, the base plate is also provided with a jig support column, which is used to abut against the upper surface of the sand box when the jig assembly jig is combined with the sand box. The height of the jig support column is the same as the height of the overall combined sand core.

[0010] Furthermore, multiple fixture support columns are evenly and symmetrically distributed on the base plate.

[0011] In addition, the present invention also provides a sand casting method for an intake casing, which uses the core assembly jig as described above, and includes the following:

[0012] Clean the surface of each sand core thoroughly to remove any loose sand.

[0013] Multiple sand cores are combined and positioned on a core assembly jig to form an integral composite sand core;

[0014] Flip the core assembly jig and position the entire assembled sand core on the sand box. Remove the nut and unload the core assembly jig. Then screw the nut onto the locking rod and lock it onto the No. 2 sand core.

[0015] After pouring the molten metal and cleaning the molding sand, remove the locking rod and nut from the intake casing casting.

[0016] Furthermore, the process of assembling and positioning multiple sand cores together on the core assembly jig to form an integral assembled sand core specifically involves:

[0017] Positioning is achieved by engaging the large end positioning hole of the No. 2 sand core with the sand core positioning head on the sand core support platform, and the large end of the No. 2 sand core is then placed against the sand core support platform.

[0018] Positioning is achieved by engaging the upper positioning core head of the No. 1 sand core with the small end positioning hole of the No. 2 sand core.

[0019] The No. 1 oil pipe sand core, the No. 2 oil pipe sand core, and the No. 3 oil pipe sand core are combined and positioned by matching their respective positioning cores with the positioning holes on the No. 1 and No. 2 sand cores;

[0020] Pass the locking rod through the middle through hole of the No. 1 sand core, the No. 2 sand core, and the sand core positioning core head in sequence, and lock it with the nut. The upper end of the locking rod is pressed against the No. 1 sand core, and the nut is pressed against the sand core positioning core head.

[0021] Furthermore, when assembling the No. 2 sand core, the cantilever arm of the No. 2 sand core is supported on the sand core support column. The sand core support column and the sand core positioning head cooperate to prevent the No. 2 sand core from rotating, so as to ensure accurate angular positioning.

[0022] Furthermore, when assembling the No. 1 and No. 3 tubing sand cores, the tubing sand cores are supported on the tubing support column, and adhesive is applied to the positioning core head to firmly attach the positioning core head of the tubing sand core to the positioning holes of the No. 1 and No. 2 sand cores.

[0023] The present invention has the following effects:

[0024] The core assembly jig of the present invention first assembles multiple sand cores into an integral assembled sand core on the core assembly jig at one time during sand core assembly, and then assembles the integral assembled sand core onto the sand box. This greatly reduces the cumulative assembly error caused by assembling sand cores one by one on the sand box, and greatly improves the stability and positioning accuracy of the integral sand core assembly, thereby improving the dimensional accuracy of the intake casing casting. Furthermore, before assembling the overall sand core with the sand box, the positioning core heads of the No. 1 sand core, No. 2 sand core, and the core assembly jig are locked by using a locking rod and nut to form a tight connection structure. This prevents the overall sand core from loosening during assembly into the sand box, which would affect the positioning accuracy of the sand core assembly. Before pouring the molten metal, the nut is removed and the core assembly jig is unloaded. Then, the nut is screwed onto the locking rod and locked onto the No. 2 sand core to lock the No. 1 and No. 2 sand cores. Through the locking action of the locking rod and nut and the gravity of the sand core itself, the problem of sand core floating during the pouring of molten metal is completely solved, further improving the dimensional accuracy of the intake casing casting.

[0025] In addition, the intake casing sand casting method of the present invention also has the above-mentioned advantages.

[0026] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0027] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0028] Figure 1a This is a schematic diagram of the No. 1 sand core, which was separated from the intake casing casting.

[0029] Figure 1b This is a schematic diagram of the No. 2 sand core formed from the intake casing casting.

[0030] Figure 1c This is a schematic diagram of the No. 1 oil pipe sand core, which was separated from the intake casing casting.

[0031] Figure 1d This is a schematic diagram of the No. 2 oil pipe sand core, which was separated from the intake casing casting.

[0032] Figure 1e This is a schematic diagram of the No. 3 oil pipe sand core, which was formed from the intake casing casting.

[0033] Figure 2 This is a schematic diagram of the existing sand core assembly process, in which sand core No. 1 and sand core No. 2 are assembled one by one on the sand box.

[0034] Figure 3 This is a three-dimensional structural diagram of the core assembly fixture according to a preferred embodiment of the present invention.

[0035] Figure 4 This is a cross-sectional structural schematic diagram of the core assembly fixture according to a preferred embodiment of the present invention.

[0036] Figure 5 This is a cross-sectional structural diagram of the combination of No. 1 sand core and No. 2 sand core onto the core assembly jig in a preferred embodiment of the present invention.

[0037] Figure 6 This is a top view of the structure after the No. 1 oil pipe sand core, No. 2 oil pipe sand core, and No. 3 oil pipe sand core are combined and positioned on the No. 1 sand core and No. 2 sand core in a preferred embodiment of the present invention.

[0038] Figure 7 This is a schematic diagram of the structure of removing the core assembly jig after the sand core assembly is completed in a preferred embodiment of the present invention. Detailed Implementation

[0039] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0040] like Figures 3 to 7 As shown, a preferred embodiment of the present invention provides a core assembly jig for assembling sand cores during the sand casting process of an intake casing. The intake casing casting is divided into four types: No. 1 sand core, No. 2 sand core, No. 1 oil pipe sand core, No. 2 oil pipe sand core, and No. 3 oil pipe sand core. The core assembly jig includes a base plate, a sand core support platform, a locking rod, and a nut. The sand core support platform is disposed on the base plate, and a sand core positioning head is disposed on the sand core support platform. The No. 2 sand core is centered by engaging with the sand core positioning head through a positioning hole at its large end, and the large end of the No. 2 sand core abuts against the sand core support platform, thereby ensuring the stability of the No. 2 sand core assembly and preventing the No. 2 sand core from shaking during the assembly process. The No. 1 sand core is centered by engaging the upper positioning head with the small end positioning hole of the No. 2 sand core. The No. 1, No. 2, and No. 3 oil pipe sand cores are combined and positioned by engaging their respective positioning heads with the positioning holes on the No. 1 and No. 2 sand cores. The sand core support platform and the sand core positioning head are hollow structures. After all the sand cores are assembled, the locking rod is passed through the No. 1, No. 2, and sand core positioning head in sequence and then locked with a nut. The upper end of the locking rod is pressed against the No. 1 sand core, and the nut is pressed against the sand core positioning head. Then, the core assembly jig is flipped over and placed on the sand box, and the lower positioning head of the No. 1 sand core is engaged with the positioning hole on the sand box for positioning. Before pouring the molten metal, the nut is removed and the core assembly jig is unloaded. Then, the nut is screwed onto the locking rod and locked onto the No. 2 sand core.

[0041] It is understood that in this embodiment, when assembling sand cores, multiple sand cores are first assembled onto the assembly jig at once to form an integral assembled sand core, and then the integral assembled sand core is assembled onto the sand box. This greatly reduces the cumulative assembly error caused by assembling sand cores one by one on the sand box, and greatly improves the stability and positioning accuracy of the integral sand core assembly, thereby improving the dimensional accuracy of the intake casing casting. Furthermore, before assembling the overall sand core with the sand box, the positioning core heads of the No. 1 sand core, No. 2 sand core, and the core assembly jig are locked by using a locking rod and nut to form a tight connection structure. This prevents the overall sand core from loosening during assembly into the sand box, which would affect the positioning accuracy of the sand core assembly. Before pouring the molten metal, the nut is removed and the core assembly jig is unloaded. Then, the nut is screwed onto the locking rod and locked onto the No. 2 sand core to lock the No. 1 and No. 2 sand cores. Through the locking action of the locking rod and nut and the gravity of the sand core itself, the problem of sand core floating during the pouring of molten metal is completely solved, further improving the dimensional accuracy of the intake casing casting.

[0042] Optionally, the base plate is further provided with two tubing support columns to provide support and lift during the assembly of tubing cores No. 1 and No. 3. It is understood that during the assembly and positioning of tubing cores No. 1 and No. 3, due to their unique structures and long suspended sections, breakage of the tubing cores is a common problem. This invention, by providing tubing support columns on the base plate, effectively avoids breakage caused by the tubing cores being suspended when assembling them onto cores No. 1 and No. 2. Furthermore, due to the presence of the tubing support column, when fine-tuning the position of the positioning core of the tubing sand core relative to the positioning holes on the No. 1 and No. 2 sand cores is required, damage to the tubing sand core can be effectively avoided, which is beneficial for the combined positioning of the tubing sand core with the No. 1 and No. 2 sand cores. Preferably, adhesive is applied to the positioning area of ​​the tubing sand core to ensure a firm bond between the tubing sand core and the No. 1 and No. 2 sand cores, thereby improving the positioning accuracy of the sand core assembly.

[0043] Optionally, the base plate is further provided with a sand core support column to support the cantilever arm of the second sand core and cooperate with the sand core positioning head to prevent the second sand core from rotating, thus ensuring accurate angular positioning. It is understood that the structure of the second sand core has a relatively long cantilever arm, which is prone to breakage in its small-diameter portion. Therefore, this invention effectively solves the breakage problem of the cantilever arm by providing a sand core support column to support the cantilever arm of the second sand core. It also prevents damage to the sand core due to collisions during assembly. Furthermore, it cooperates with the sand core positioning head to achieve angular positioning between the sand core positioning head and the positioning hole at the large end of the second sand core. Additionally, a slot can be provided on the sand core support column, which cooperates with the protruding part of the cantilever arm of the second sand core to prevent rotation of the second sand core, further improving angular positioning accuracy.

[0044] Optionally, the base plate is also provided with multiple positioning pin holes for engaging with multiple positioning pins on the sand box to ensure the center positioning accuracy and angular positioning accuracy when the overall assembled sand core is assembled with the sand box. It can be understood that when the overall assembled sand core needs to be assembled with the sand box, after flipping the core assembly jig, the positioning pin holes on the base plate are aligned with the positioning pins on the sand box for positioning guidance until the lower positioning core head of the No. 1 sand core is positioned in the positioning hole of the sand box. The engagement of the positioning pin holes and positioning pins further improves the center positioning accuracy and angular positioning accuracy when the overall assembled sand core is assembled with the sand box.

[0045] Preferably, the base plate is further provided with a jig support column, which is used to abut against the upper surface of the sand box when the core assembly jig is combined with the sand box. The height of the jig support column is the same as the height of the overall assembled sand core. It can be understood that when the overall assembled sand core needs to be combined with the sand box, the core assembly jig is flipped over and the positioning pin hole on the base plate is aligned with the positioning pin on the sand box. When the lower positioning core head of the No. 1 sand core is positioned in the positioning hole of the sand box, since the height of the jig support column is the same as the design height of the overall assembled sand core, the jig support column abuts against the upper surface of the sand box. Thus, the height dimension of the overall assembled sand core can be determined through the jig support column. If, after the overall assembled sand core and sand box are positioned, the fixture support column does not contact the upper surface of the sand box, it means that the height of the overall assembled sand core does not meet the design requirements, and the assembly accuracy between sand core No. 1 and sand core No. 2 in the height direction does not meet the requirements, resulting in a large gap. In this case, adjustments need to be made to the overall assembled sand core on the core assembly fixture, such as increasing the tightening force of the nuts to further tighten sand core No. 1 and sand core No. 2. As a further preferred option, multiple fixture support columns are evenly and symmetrically distributed on the base plate. After the overall assembled sand core and sand box are positioned, the height of the overall assembled sand core is only considered to meet the design requirements when all multiple fixture support columns are in contact with the upper surface of the sand box. This prevents a single fixture support column from contacting the upper surface of the sand box due to the overall assembled sand core tilting, thereby ensuring the accuracy of the overall assembled sand core height measurement.

[0046] It can be understood that the sand core assembly process in this embodiment is as follows: First, the large end of the second sand core is placed on the sand core support platform, and the positioning hole of the large end of the second sand core is matched with the positioning head of the sand core to achieve center positioning. At the same time, the cantilever arm of the second sand core is supported on the sand core support column, thereby performing angular positioning of the second sand core. Then, the upper positioning head of the first sand core is assembled into the positioning hole of the small end of the second sand core to achieve center positioning.

[0047] Next, assemble the No. 1 tubing core. Attach the six positioning tips from the No. 1 tubing core to the positioning holes of both the No. 1 and No. 2 tubing cores. Support the No. 1 tubing core on the tubing support column to prevent it from wobbling, and apply adhesive to the positioning points to secure them firmly. Then, assemble the No. 2 tubing core. Attach the two positioning tips from the No. 2 tubing core to the positioning holes of both the No. 1 and No. 2 tubing cores, and apply adhesive to the positioning points to secure them firmly. Finally, assemble the No. 3 tubing core. Attach the two positioning tips from the No. 3 tubing core to the positioning holes of both the No. 1 and No. 2 tubing cores. Support the No. 3 tubing core on another tubing support column to prevent it from wobbling, and apply adhesive to the positioning points to secure them firmly.

[0048] Then, the locking rod is passed through the middle through hole of the No. 1 sand core, the No. 2 sand core, and the sand core positioning core head. The locking rod is tightened with a nut. The upper end of the locking rod is pressed against the No. 1 sand core, and the nut is pressed against the sand core positioning core head. At this point, all the sand cores are assembled on the core assembly jig to form a structurally secure whole sand core assembly.

[0049] Next, flip the core assembly jig and align the multiple positioning pin holes on the core assembly jig with the multiple positioning pins on the sand box. Position the entire assembled sand core and sand box by using the positioning pin holes and positioning pins for positioning guidance until the multiple jig support columns simultaneously contact the upper surface of the sand box.

[0050] Finally, unscrew the nut and remove the core assembly jig. Then, screw the nut onto the locking rod and lock it onto the No. 2 sand core to lock the No. 1 and No. 2 sand cores together again. The sand core assembly is now complete, ready for molten metal pouring. After pouring is complete and the sand is cleaned, remove the locking rod and nut.

[0051] In addition, another embodiment of the present invention provides a sand casting method for an intake casing, preferably using the core assembly jig as described above, comprising the following:

[0052] Clean the surface of each sand core thoroughly to remove any loose sand.

[0053] Multiple sand cores are combined and positioned on a core assembly jig to form an integral composite sand core;

[0054] Flip the core assembly jig and position the entire assembled sand core on the sand box. Remove the nut and unload the core assembly jig. Then screw the nut onto the locking rod and lock it onto the No. 2 sand core.

[0055] After pouring the molten metal and cleaning the molding sand, remove the locking rod and nut from the intake casing casting.

[0056] It is understood that in the sand casting method of the intake casing in this embodiment, when assembling the sand cores, multiple sand cores are first assembled onto the core assembly jig to form an integral assembled sand core, and then the integral assembled sand core is assembled onto the sand box. This greatly reduces the cumulative assembly error caused by assembling the sand cores one by one on the sand box, and greatly improves the stability and positioning accuracy of the integral sand core assembly, thereby improving the dimensional accuracy of the intake casing casting. Furthermore, before assembling the overall sand core with the sand box, the positioning core heads of the No. 1 sand core, No. 2 sand core, and the core assembly jig are locked by using a locking rod and nut to form a tight connection structure. This prevents the overall sand core from loosening during assembly into the sand box, which would affect the positioning accuracy of the sand core assembly. Before pouring the molten metal, the nut is removed and the core assembly jig is unloaded. Then, the nut is screwed onto the locking rod and locked onto the No. 2 sand core to lock the No. 1 and No. 2 sand cores. Through the locking action of the locking rod and nut and the gravity of the sand core itself, the problem of sand core floating during the pouring of molten metal is completely solved, further improving the dimensional accuracy of the intake casing casting.

[0057] It can be understood that the process of assembling and positioning multiple sand cores together on the core assembly jig to form an integral assembled sand core specifically involves:

[0058] Positioning is achieved by engaging the large end positioning hole of the No. 2 sand core with the sand core positioning head on the sand core support platform, and the large end of the No. 2 sand core is then placed against the sand core support platform.

[0059] Positioning is achieved by engaging the upper positioning core head of the No. 1 sand core with the small end positioning hole of the No. 2 sand core.

[0060] The No. 1 oil pipe sand core, the No. 2 oil pipe sand core, and the No. 3 oil pipe sand core are combined and positioned by matching their respective positioning cores with the positioning holes on the No. 1 and No. 2 sand cores;

[0061] Pass the locking rod through the middle through hole of the No. 1 sand core, the No. 2 sand core, and the sand core positioning core head in sequence, and lock it with the nut. The upper end of the locking rod is pressed against the No. 1 sand core, and the nut is pressed against the sand core positioning core head.

[0062] In this invention, during the assembly of the No. 2 sand core, its cantilever arm is supported on a sand core support column. The support column, in conjunction with the sand core positioning head, prevents the No. 2 sand core from rotating, ensuring accurate angular positioning. It is understood that the No. 2 sand core has a relatively long cantilever arm, which is prone to breakage at its small diameter. Therefore, this invention uses a sand core support column to support the cantilever arm of the No. 2 sand core, effectively solving the breakage problem and preventing damage to the sand core due to collisions during assembly. Furthermore, the support column also works with the sand core positioning head to achieve angular positioning between the positioning head and the positioning hole at the large end of the No. 2 sand core. Additionally, a slot can be provided on the sand core support column, which engages with the protruding part of the cantilever arm of the No. 2 sand core to prevent rotation, further improving angular positioning accuracy.

[0063] In this invention, when assembling the No. 1 and No. 3 tubing sand cores, the tubing sand cores are supported on tubing support columns, and adhesive is applied to the positioning core heads to firmly bond them into the positioning holes of the No. 1 and No. 2 sand cores. It is understood that during the assembly and positioning of the No. 1 and No. 3 tubing sand cores, due to their unique structures and long suspended sections, breakage of the tubing sand cores is a potential problem. This invention, by using tubing support columns to support the No. 1 and No. 3 tubing sand cores, effectively avoids breakage caused by the suspended tubing sand cores. Furthermore, the presence of the tubing support columns effectively prevents damage to the tubing sand cores when fine-tuning the position of the positioning core heads relative to the positioning holes on the No. 1 and No. 2 sand cores is required, thus facilitating the assembly and positioning of the tubing sand cores with the No. 1 and No. 2 sand cores. In addition, adhesive is applied to the positioning points of the tubing sand core to ensure a firm bond between the tubing sand core and the No. 1 and No. 2 sand cores, thereby improving the positioning accuracy of the sand core assembly.

[0064] It is understandable that during the process of positioning the overall assembled sand core onto the sand box, after flipping the core assembly jig, the positioning pin holes on the base plate are aligned with the positioning pins on the sand box for positioning guidance, until the lower positioning core head of the No. 1 sand core is positioned in the positioning hole of the sand box. The cooperation between the positioning pin hole and the positioning pin further improves the center positioning accuracy and angular positioning accuracy when assembling the overall assembled sand core and the sand box. Preferably, when the lower positioning core head of the No. 1 sand core is just positioned in the positioning hole of the sand box, since the height of the jig support column is the same as the design height of the overall assembled sand core, the jig support column just abuts against the upper surface of the sand box, thus the height dimension of the overall assembled sand core can be determined through the jig support column. If, after the overall assembled sand core and sand box are positioned, the fixture support column does not contact the upper surface of the sand box, it means that the height of the overall assembled sand core does not meet the design requirements, and the assembly accuracy between sand core No. 1 and sand core No. 2 in the height direction does not meet the requirements, resulting in a large gap. In this case, adjustments need to be made to the overall assembled sand core on the core assembly fixture, such as increasing the tightening force of the nuts to further tighten sand core No. 1 and sand core No. 2. As a further preferred option, multiple fixture support columns are evenly and symmetrically distributed on the base plate. After the overall assembled sand core and sand box are positioned, the height of the overall assembled sand core is only considered to meet the design requirements when all multiple fixture support columns are in contact with the upper surface of the sand box. This prevents a single fixture support column from contacting the upper surface of the sand box due to the overall assembled sand core tilting, thereby ensuring the accuracy of the overall assembled sand core height measurement.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A core assembly jig for assembling sand cores during the sand casting process of an intake casing, wherein the intake casing casting is divided into No. 1 sand core, No. 2 sand core, No. 1 oil pipe sand core, No. 2 oil pipe sand core, and No. 3 oil pipe sand core, characterized in that, The core assembly jig includes a base plate, a sand core support platform, a locking rod, and a nut. The sand core support platform is mounted on the base plate and has a sand core positioning head. Sand core number two is centered by engaging the positioning head with its large end positioning hole, and the large end of sand core number two rests against the sand core support platform. Sand core number one is positioned by engaging the small end positioning hole of sand core number two with its upper positioning head. Oil pipe sand cores number one, two, and three are assembled by engaging their respective positioning heads with the positioning holes on sand cores number one and two. Positioning: The sand core support platform and the sand core positioning head are hollow structures. After all sand cores are assembled, the locking rod is passed through the No. 1 sand core, the No. 2 sand core, and the sand core positioning head in sequence and then locked with a nut. The upper end of the locking rod is pressed against the No. 1 sand core, and the nut is pressed against the sand core positioning head. Then, the core assembly jig is flipped over and placed on the sand box, and the lower positioning head of the No. 1 sand core is matched with the positioning hole on the sand box for positioning. Before pouring the molten metal, the nut is removed and the core assembly jig is unloaded. Then, the nut is screwed onto the locking rod and locked onto the No. 2 sand core.

2. The core assembly fixture as described in claim 1, characterized in that, The base plate is also equipped with two oil pipe support columns, which are used to support and lift the No. 1 oil pipe sand core and the No. 3 oil pipe sand core when they are assembled.

3. The core assembly fixture as described in claim 1, characterized in that, The base plate is also equipped with a sand core support column, which is used to support the cantilever arm of the No. 2 sand core and cooperate with the sand core positioning head to prevent the No. 2 sand core from rotating, so as to ensure accurate angular positioning.

4. The core assembly fixture as described in claim 1, characterized in that, The base plate is also provided with positioning pin holes, which are used to cooperate with the positioning pins on the sand box for positioning, so as to ensure the center positioning accuracy and angular positioning accuracy when the overall combined sand core is combined with the sand box.

5. The core assembly fixture as described in claim 4, characterized in that, The base plate is also provided with a jig support column, which is used to abut against the upper surface of the sand box when the jig assembly jig is combined with the sand box. The height of the jig support column is the same as the height of the overall combined sand core.

6. The core assembly fixture as described in claim 5, characterized in that, Multiple fixture support columns are evenly and symmetrically distributed on the base plate.

7. A sand casting method for an intake casing, employing the core assembly jig as described in any one of claims 1 to 6, characterized in that, Includes the following: Clean the surface of each sand core thoroughly to remove any loose sand. Multiple sand cores are combined and positioned on a core assembly jig to form an integral composite sand core; Flip the core assembly jig and position the entire assembled sand core on the sand box. Remove the nut and unload the core assembly jig. Then screw the nut onto the locking rod and lock it onto the No. 2 sand core. After pouring the molten metal and cleaning the molding sand, remove the locking rod and nut from the intake casing casting.

8. The intake casing sand casting method as described in claim 7, characterized in that, The process of assembling and positioning multiple sand cores together on a core assembly jig to form an integral assembled sand core is as follows: Positioning is achieved by engaging the large end positioning hole of the No. 2 sand core with the sand core positioning head on the sand core support platform, and the large end of the No. 2 sand core is then placed against the sand core support platform. Positioning is achieved by engaging the upper positioning core head of the No. 1 sand core with the small end positioning hole of the No. 2 sand core; The No. 1 oil pipe sand core, the No. 2 oil pipe sand core, and the No. 3 oil pipe sand core are combined and positioned by matching their respective positioning cores with the positioning holes on the No. 1 and No. 2 sand cores; Pass the locking rod through the middle through hole of the No. 1 sand core, the No. 2 sand core, and the sand core positioning core head in sequence, and lock it with the nut. The upper end of the locking rod is pressed against the No. 1 sand core, and the nut is pressed against the sand core positioning core head.

9. The intake casing sand casting method as described in claim 8, characterized in that, When assembling the No. 2 sand core, the cantilever arm of the No. 2 sand core is supported on the sand core support column. The sand core support column and the sand core positioning head cooperate to prevent the No. 2 sand core from rotating, so as to ensure accurate angular positioning.

10. The intake casing sand casting method as described in claim 8, characterized in that, When assembling tubing cores No. 1 and No. 3, the tubing cores are supported on tubing support columns, and adhesive is applied to the positioning core head to firmly attach the positioning core head of the tubing core to the positioning holes of No. 1 and No. 2.

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