Resin sand core shaping tool and sand core heat treatment device
By using resin-based sand core shaping fixtures and heat treatment equipment, the dimensional accuracy problem of resin-based sand cores in the casting R&D stage was solved, achieving efficient shaping and dimensional accuracy assurance of sand cores, and reducing casting defects and production costs.
Patent Information
- Application Number
- CN202520425912.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-03-12
AI Technical Summary
During the casting development stage, resin-based sand cores may fail to meet dimensional accuracy requirements due to factors such as production conditions, self-weight, and internal stress. This can lead to improper matching between the sand core and the sand mold, resulting in casting defects, increased production costs, and disruption to production plans.
A resin-based sand core shaping fixture, including a stop mechanism and a push mechanism, is used. The sand core size is adjusted by the stop surface conforming to the core head and the push force. The sand core is then shaped and heated using a sand core heat treatment device to ensure the dimensional accuracy of the sand core.
It improved the dimensional accuracy and production efficiency of sand cores, reduced the incidence of casting defects, decreased the scrap rate of sand cores, and ensured the normal production of castings.
Smart Images
Figure CN223916591U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sand core shaping technology, and in particular to a resin-based sand core shaping fixture and a sand core heat treatment device. Background Technology
[0002] In the production of large, high-end castings, due to the complexity of the internal structure of the castings, sand cores are usually needed to form cavities in the castings. For castings such as precision large water jackets and oil circuits, when the dimensional accuracy is high, the dimensional accuracy requirements of the sand cores are also high.
[0003] During the casting R&D and verification phase, rapid fabrication verification methods are often employed. However, resin-based sand cores made using 3D printing or simple molds may fail to meet dimensional accuracy requirements after molding due to factors such as production conditions, core weight, and internal stress. Alternatively, small clearances between the sand core and the mold can cause deformation, leading to changes in the core head position. This can result in improper core-mold alignment during core assembly, causing issues like core breakage, sand loss, or improper core placement. Ultimately, this can lead to defects in the casting, such as large burrs, sand holes, or porosity. If the sand core's dimensions deviate, it often needs to be scrapped and remanufactured, increasing production costs and disrupting the normal production schedule.
[0004] Therefore, the above problems urgently need to be solved. Utility Model Content
[0005] The purpose of this invention is to provide a resin-based sand core shaping fixture and a sand core heat treatment device to ensure the dimensional accuracy of the sand core.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] A resin-based sand core shaping fixture is used to shape sand cores. The sand core includes a sand core body and a core head connected to the sand core body. The resin-based sand core shaping fixture includes:
[0008] The stop mechanism includes multiple stop parts spaced apart, which can be assembled to form a stop surface for stopping the movement of the core head, and the stop surface is contoured to the side of the core head away from the sand core body.
[0009] A pushing mechanism is provided on the side of the sand core body away from the core head, and is used to push the sand core body in a direction close to the stop mechanism so that the distance between the core head and any of the stop parts is not greater than a preset distance.
[0010] Preferably, the pushing mechanism includes:
[0011] The connecting plate is directly opposite the sand core body and is spaced apart from it;
[0012] Several pushing parts are provided on the connecting plate and are used to push the sand core body toward the stop mechanism.
[0013] Preferably, each of the aforementioned pushing parts includes:
[0014] The push screw passes through and is screwed onto the connecting plate;
[0015] The push block is rotatably mounted at the end of the push screw that is directly opposite the sand core body.
[0016] Preferably, the pushing block is configured to conform to the shape of the part directly opposite the sand core body.
[0017] Preferably, the position of any of the pushing parts is adjustable.
[0018] Preferably, there are multiple pushing parts, which are staggered with multiple stopping parts.
[0019] Preferably, the resin-based sand core shaping fixture further includes an adjustment mechanism for adjusting the distance between the pushing mechanism and the stopping mechanism.
[0020] Preferably, the stop mechanism further includes a fixed base, which is directly opposite to the core head and spaced apart, and the plurality of stop parts are detachably mounted on the fixed base.
[0021] Preferably, there are multiple core heads and multiple stop mechanisms, and each core head corresponds to one of the multiple stop mechanisms.
[0022] A sand core heat treatment apparatus includes a baking mechanism and a resin-based sand core shaping fixture as described above, wherein the baking mechanism is used to heat the resin-based sand core shaping fixture on which the sand core is fixed.
[0023] The beneficial effects of this utility model are:
[0024] The resin-based sand core shaping fixture proposed in this utility model places the core head on multiple stop parts. Since the stop surfaces are contoured to the side of the core head away from the sand core body, if the sand core size is qualified, the distance between the core head and any stop part will not be greater than a preset distance. Conversely, if the sand core size deviates, the gap between the core head and some stop parts will be greater than the preset distance. Under the action of the pushing mechanism, this distance can be adjusted to complete the shaping of the sand core, thereby ensuring the dimensional accuracy of the sand core. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the sand core structure;
[0026] Figure 2 This is one of the structural schematic diagrams of the resin-based sand core shaping tool in the embodiments of this utility model;
[0027] Figure 3 This is the second structural schematic diagram of the resin-based sand core shaping tool in the embodiments of this utility model.
[0028] In the picture:
[0029] 100. Sand core; 110. Sand core body; 120. Core head;
[0030] 1. Stopping mechanism; 11. Stopping part; 12. Fixed seat; 13. Enclosure rod;
[0031] 2. Pushing mechanism; 21. Connecting plate; 22. Pushing part; 221. Pushing screw; 222. Pushing block;
[0032] 3. Adjust the organization. Detailed Implementation
[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.
[0034] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0036] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0037] During the research and development phase of castings, before finalization, the casting structure needs to be adjusted. After adjustment, the casting needs to be verified. This process often uses resin-based sand cores made with 3D printing or simple molds for verification. Please refer to [link to relevant documentation]. Figure 1 The sand core 100 includes a sand core body 110 and a core head 120 connected to the sand core body 110. However, after the sand core 100 is formed, the dimensional accuracy of the sand core 100 is prone to deviation due to factors such as production conditions, the weight of the sand core 100, or internal stress, which affects the verification of the casting.
[0038] Furthermore, resin-based sand cores 100 refer to core materials using resin as the main binder. Due to the elasticity of the resin binder, this elasticity makes it easier for the surface of the sand core 100 to absorb minor adjustments by the shaping fixture, thus enabling localized dimensional shaping of the sand core 100. Therefore, based on this characteristic of resin-based sand cores 100, this embodiment proposes a resin-based sand core shaping fixture. This fixture aims to shape the sand core 100 by applying opposite forces to the sand core body 110 and the core head 120, thereby ensuring the dimensional accuracy of the sand core 100.
[0039] Specifically, see Figure 2 and Figure 3 The resin-based sand core shaping fixture includes a stop mechanism 1 and a pushing mechanism 2. The stop mechanism 1 includes a plurality of spaced-apart stop parts 11, which can be assembled to form a stop surface for stopping the movement of the core head 120, and the stop surface is contoured to the side of the core head 120 away from the sand core body 110. The pushing mechanism 2 is disposed on the side of the sand core body 110 away from the core head 120, and is used to push the sand core body 110 in a direction close to the stop mechanism 1, so that the distance between the core head 120 and any stop part 11 is not greater than a preset distance.
[0040] It is understandable that by placing the core head 120 on multiple stop portions 11, and since the stop surfaces and the core head 120 are shaped away from the side of the sand core body 110, if the dimensions of the sand core 100 are qualified, the distance between the core head 120 and any stop portion 11 will not be greater than the preset distance. Conversely, if the dimensions of the sand core 100 deviate, the gap between the core head 120 and some stop portions 11 will be greater than the preset distance. This setting can improve the efficiency of detecting the dimensions of the sand core 100, thereby improving the production efficiency of castings. Moreover, under the action of the pushing mechanism 2, the distance between the stop portion 11 and the core head 120 can be adjusted to complete the shaping of the sand core 100, thereby ensuring the consistency and dimensional accuracy of the sand core 100.
[0041] For example, with Figure 1 Taking the sand core 100 shown as an example, the core head 120 is located at the bottom of the sand core body 110. The stop mechanism 1 is set below the core head 120 as a support structure, and the pushing mechanism 2 is set above the sand core body 110. Before shaping the sand core 100, it is necessary to check the size of the sand core 100. After the sand core 100 is cooled to below 200°C, the core head 120 is placed on the stop part 11. Then, the distance between the core head 120 and the stop part 11 is measured with measuring tools such as feeler gauges. If the distance is not greater than the preset distance, such as 0.2mm, the sand core 100 is a qualified product and does not need to be corrected in size. If the distance exceeds the rated distance, such as 1.5mm, manual core trimming is required, or the sand core 100 is scrapped. If the distance is between the preset distance and the rated distance, that is, between 0.2mm and 1.5mm, it is shaped using the shaping fixture. When shaping the sand core 100, the pushing mechanism 2 abuts against the sand core body 110 and applies downward pressure to the sand core body 110, thereby bringing the sand core 100 closer to the stop mechanism 1, thereby shortening the distance between the core head 120 and the stop part 11. Then, the distance between the core head 120 and the stop part 11 is measured again with a feeler gauge. If the distance is still greater than the preset distance, the pushing mechanism 2 continues to apply downward pressure to the sand core body 110 for secondary shaping.
[0042] In this embodiment, the pushing mechanism 2 includes a connecting plate 21 and a plurality of pushing parts 22. The connecting plate 21 is directly opposite to the sand core body 110 and is spaced apart. The plurality of pushing parts 22 are disposed on the connecting plate 21 and are used to push the sand core body 110 toward the stop mechanism 1. It can be understood that after the sand core 100 is placed, the plurality of pushing parts 22 can apply a pushing force toward the stop mechanism 1 to the sand core body 110, thereby causing the sand core 100 to deform, thereby shortening the distance between the core head 120 and the stop part 11.
[0043] Specifically, each pushing part 22 includes a pushing screw 221 and a pushing block 222. The pushing screw 221 passes through and is screwed to the connecting plate 21; the pushing block 222 is rotatably disposed at the end of the pushing screw 221 that is directly opposite the sand core body 110. It can be understood that under the action of the pushing screw 221, the pushing block 222 can be controlled to move closer to the sand core body 110, and with the continuous action of the pushing screw 221, the pushing block 222 can apply a pushing force to the sand core body 110 to complete the shaping of the sand core 100. Furthermore, the rotatably disposed pushing block 222 can prevent the pushing screw 221 from rotating while driving the pushing block 222 to rotate, thereby preventing the pushing block 222 from damaging the sand core body 110 and further ensuring the dimensional accuracy of the sand core 100.
[0044] Furthermore, the pushing block 222 is shaped to match the corresponding part of the sand core body 110. This arrangement ensures that the pushing block 222 can fit into the corresponding part of the sand core body 110, thereby ensuring the uniformity of force on the sand core body 110 when the pushing block 222 pushes against the sand core 100, and thus further ensuring the shaping quality of the sand core 100.
[0045] Furthermore, the position of any of the pushers 22 is adjustable. It is understood that the deformation position of the sand core 100 is determined based on the measurement results of the feeler gauge, and then the position of the pusher 22 is adjusted according to the deformation position, thereby improving the applicability of the shaping fixture.
[0046] For example, the connecting plate 21 has a plurality of threaded holes, and the number of threaded holes is greater than the number of push screws 221. After the feeler gauge determines the distance between each position of the core head 120 and the corresponding stop part 11, it sets the push screws 221 in the corresponding threaded holes so as to apply a pushing force to the corresponding position on the sand core body 110, thereby completing the shaping of the sand core 100.
[0047] In this embodiment, multiple pushing parts 22 are provided, and they are staggered with multiple stopping parts 11. This arrangement can distribute the stress points, thereby making the pressure on the sand core 100 more evenly distributed, which can reduce the risk of uniform overload on the sand core 100 and further improve the shaping quality of the shaping fixture.
[0048] It should be noted that during the shaping process, based on the deformation of the sand core 100, the middle pushing part 22 of the sand core body 110 is first brought into contact with the sand core body 110. Under the action of the pushing part 22, the distance between the core head 120 and the corresponding stop part 11 is made smaller than the preset distance. Then, the pushing parts 22 on both sides are adjusted in sequence to shape both sides of the sand core 100. This setting can further ensure that the pressure on the sand core 100 is distributed more evenly, thereby reducing the risk of uniform overload of the sand core 100.
[0049] It should also be noted that when shaping the sand core 100 through different pushing parts 22, attention should be paid to the change in the distance between the core head 120 and the corresponding stop part 11 at other positions, so as to avoid excessive compression of the sand core 100 and resulting in breakage of the sand core 100.
[0050] In this embodiment, the stop mechanism 1 further includes a fixed base 12, which is directly opposite to the core head 120 and spaced apart. Multiple stop parts 11 are detachably mounted on the fixed base 12. It can be understood that the position of the stop parts 11 can be adjusted according to the deformation state of the sand core 100, thereby improving the applicability of the shaping fixture.
[0051] For example, the stop part 11 is a stop rod, which is bolted to the fixing seat 12. The fixing seat 12 is provided with a plurality of threaded connection holes that are adapted to the bolts, so as to facilitate the adjustment of the position of the stop rod.
[0052] It should be noted that one end face of all the stop bars is set parallel to form a stop surface, and the stop surface can fit against the core head 120 with precise dimensions, so as to facilitate the inspection of the dimensions of the sand core 100, thereby improving the production efficiency of castings.
[0053] Furthermore, the stop mechanism 1 also includes multiple surrounding rods 13, all of which are disposed on the fixed base 12 and surround the core head 120. It is understood that after the core head 120 is placed on the stop portion 11, the surrounding rods 13 can surround the core head 120, thereby limiting the circumference of the core head 120 and preventing it from separating from the stop portion 11 during the shaping process, thus further ensuring the shaping quality.
[0054] In this embodiment, multiple core heads 120 and multiple stop mechanisms 1 are provided, with each core head 120 corresponding to a different stop mechanism 1. It is understood that the position and number of core heads 120 will vary depending on the casting corresponding to the sand core 100. During the shaping process, multiple stop mechanisms 1 are positioned on the other side of the sand core 100, corresponding to each core head 120. The pushing mechanism 2 abuts against the sand core body 110 and can push the sand core 100 towards the corresponding core head 120 to complete the shaping of the sand core 100.
[0055] In addition, the resin-based sand core shaping fixture also includes an adjustment mechanism 3, which is used to adjust the distance between the pushing mechanism 2 and the stopping mechanism 1. It is understood that the adjustment mechanism 3 can adjust the distance between the pushing mechanism 2 and the stopping mechanism 1 to accommodate different types of sand cores 100, thereby further improving the applicability of the shaping fixture.
[0056] Preferably, the adjustment mechanism 3 includes an adjustment screw and an adjustment motor. The adjustment screw is disposed between the fixed base 12 and the connecting plate 21. Under the action of the adjustment motor, the adjustment screw can be driven to rotate, thereby adjusting the distance between the fixed base 12 and the connecting plate 21, so as to achieve the purpose of adjusting the distance between the pushing mechanism 2 and the stop mechanism 1.
[0057] Based on the above, this embodiment also proposes a sand core heat treatment apparatus, which includes a baking mechanism and a resin-based sand core shaping fixture as described above. The baking mechanism is used to heat the resin-based sand core shaping fixture on which the sand core is fixed. It is understood that after the sand core 100 is shaped, the sand core 100 and the entire shaping fixture are placed together in a baking oven or other baking mechanism for baking to perform heat treatment on the sand core 100. This improves the strength of the sand core 100, reduces gas generation, and better ensures the stability of the casting during the production process.
[0058] It should be noted that the material of the shaping tool should be a high-temperature resistant material among the existing materials, which will not be elaborated here.
[0059] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A resin-based sand core shaping fixture for shaping a sand core (100), the sand core (100) comprising a sand core body (110) and a core head (120) connected to the sand core body (110), characterized in that, The resin-based sand core shaping fixture includes: The stop mechanism (1) includes a plurality of stop parts (11) spaced apart. The plurality of stop parts (11) can be assembled to form a stop surface for stopping the movement of the core head (120), and the stop surface is contoured to the side of the core head (120) away from the sand core body (110). The pushing mechanism (2) is disposed on the side of the core body (110) away from the core head (120) and is used to push the core body (110) in a direction close to the stop mechanism (1) so that the distance between the core head (120) and any of the stop parts (11) is not greater than a preset distance.
2. The resin-based sand core shaping fixture according to claim 1, characterized in that, The pushing mechanism (2) includes: The connecting plate (21) is directly opposite to the sand core body (110) and is spaced apart; Several pushing parts (22) are provided on the connecting plate (21) and are used to push the sand core body (110) toward the stop mechanism (1).
3. The resin-based sand core shaping fixture according to claim 2, characterized in that, Each of the aforementioned push-off parts (22) includes: The push screw (221) passes through and is screwed to the connecting plate (21); The push block (222) is rotatably disposed at the end of the push screw (221) that is directly opposite the sand core body (110).
4. The resin-based sand core shaping fixture according to claim 3, characterized in that, The push block (222) is set in a shape that is directly opposite the sand core body (110).
5. The resin-based sand core shaping fixture according to claim 2, characterized in that, The position of any of the push-off parts (22) can be adjusted.
6. The resin-based sand core shaping fixture according to claim 2, characterized in that, The pushing part (22) is provided in multiple ways and is staggered with the multiple stopping parts (11).
7. The resin-based sand core shaping fixture according to claim 1, characterized in that, The resin-based sand core shaping fixture also includes an adjustment mechanism (3), which is used to adjust the distance between the pushing mechanism (2) and the stopping mechanism (1).
8. The resin-based sand core shaping fixture according to claim 1, characterized in that, The stop mechanism (1) further includes a fixed base (12) which is directly opposite to the core head (120) and is spaced apart. A plurality of the stop parts (11) are detachably disposed on the fixed base (12).
9. The resin-based sand core shaping fixture according to claim 1, characterized in that, Multiple cores (120) are provided, and multiple stop mechanisms (1) are provided, with each core (120) and each stop mechanism (1) corresponding to one another.
10. A sand core heat treatment apparatus, characterized in that, It includes a baking mechanism and a resin-based sand core shaping fixture as described in any one of claims 1-9, wherein the baking mechanism is used to heat the resin-based sand core shaping fixture on which the sand core (100) is fixed.