General-purpose chill for resin sand casting

Abstract

The utility model discloses a general type cold iron for resin sand casting, including the cold iron body, the cold iron body is circular table shape, the upper end diameter of cold iron body is greater than the lower end diameter, and the upper end of cold iron body is provided with the recess along the axial direction, is provided with the strip handle in the recess, and the both ends of strip handle are fixedly connected with the cold iron body, and the extension direction of strip handle is perpendicular with the axial direction of cold iron body, and the upper end surface of strip handle is flush with the upper end surface of cold iron body. The utility model solves the problem of the great labor intensity caused by the inconvenient grabbing of the cylindrical cold iron in the prior art.

Description

Technical Field

[0001] This utility model belongs to the field of casting tooling technology, specifically relating to a general-purpose chill for resin sand casting. Background Technology

[0002] Thick-section castings are widely used in heavy equipment manufacturing, including core castings for large injection molding machines, die casting machines, and hydraulic presses; key castings for large wind power and nuclear power equipment; and machine tool beds. Due to structural design requirements, these castings generally exhibit characteristics of concentrated wall thickness and oversized dimensions in certain areas. During resin sand casting, the slow heat dissipation and uneven cooling rate in thick-walled areas become the core causes of casting defects such as shrinkage cavities, porosity, and substandard metallographic structures, seriously affecting the mechanical properties and service safety of the castings. Therefore, it is necessary to accelerate local cooling and optimize the solidification sequence by placing chills in critical hot spots to ensure casting quality.

[0003] In traditional resin sand casting, for thick, flat areas of large-section castings, multiple cylindrical chills are typically placed at intervals for rapid cooling. However, existing cylindrical chills generally lack dedicated handles or gripping structures; their design focuses solely on the cooling function without considering practical operational needs. Furthermore, these chills typically weigh 15-30 kg each, and due to the lack of effective leverage points, workers must lift, tie with ropes, or work in groups to handle them. This not only results in extremely high labor intensity but also poses a safety hazard due to unstable gripping, potentially causing the chills to slip and fall. A fall could impact production efficiency and casting quality. Utility Model Content

[0004] The purpose of this invention is to provide a general-purpose chill for resin sand casting, which solves the problem of high labor intensity caused by the inconvenience of grasping cylindrical chills in the prior art.

[0005] The technical solution adopted by this utility model is a general-purpose chill for resin sand casting, including a chill body, the chill body is in the shape of a frustum, the upper diameter of the chill body is larger than the lower diameter, and a groove is provided along the axial direction at the upper end of the chill body. A strip-shaped handle is provided in the groove, the two ends of the strip-shaped handle are fixedly connected to the chill body, the extension direction of the strip-shaped handle is perpendicular to the axial direction of the chill body, and the upper end surface of the strip-shaped handle is flush with the upper end surface of the chill body.

[0006] The present invention is further characterized in that, The depth of the groove at the upper end of the chill body is 40mm.

[0007] The height of the chilled iron body shall not be less than 120mm.

[0008] The chill body is made of gray cast iron and is cast using a resin sand foam molding process.

[0009] The cold iron body and the strip handle are molded as one piece.

[0010] The cross-sectional dimensions of the strip handle are 20mm × 25mm.

[0011] The single-sided slope of the chilled iron body is 3°~6°.

[0012] The cold iron body has an annular groove in the middle, with a height of 10mm to 20mm and a depth of 10mm.

[0013] The beneficial effects of this utility model are: (1) The universal chill for resin sand casting of this utility model has a strip handle in the groove at the upper end of the chill body. The handle is flush with the upper surface and does not occupy extra space or interfere with the sand mold shaping. Workers do not need to lift or tie it. They can grasp and apply force stably with one hand, which greatly reduces labor intensity and shortens the time for handling and placing the chill, significantly improving production efficiency and meeting the needs of mass production of thick and large cross-section castings.

[0014] (2) The chill body of this utility model is made of HT250 grade gray cast iron and is integrally formed by resin sand foam molding. The excellent thermal conductivity of gray cast iron can quickly absorb the heat in the thick wall area of ​​the casting, meet the core requirements of rapid cooling and eliminating casting defects. The integral molding process ensures that the handle and the chill body are firmly connected without splicing gaps, can withstand the impact of frequent gripping, avoid the handle from breaking, and extend the service life of the chill.

[0015] The chill of this utility model has a simple overall structure. Its frustum-shaped design and standardized dimensions are suitable for the thick-walled planar chilling requirements of various thick-section castings such as large injection molding machines, die casting machines, wind power, nuclear power, and machine tool beds. It eliminates the need to design chill structures separately for different castings, thus broadening the application range and reducing the research and development and production costs of special chills.

[0016] (3) The universal chill for resin sand casting of this utility model has an annular groove in the middle of the chill body. After the chill is placed into the resin sand mold, the resin sand will naturally fill the annular groove cavity. After the sand mold is cured, the filled resin sand and the groove form a firm mechanical interlocking structure, which replaces the only planar contact of the traditional chill. It tightly "locks" the chill and the sand mold to enhance the connection stability. It can effectively resist the vibration and impact force when the mold is lifted, balance the chill's own weight and inertial force, and ensure that the chill is firmly embedded in the preset position of the sand mold throughout the entire process of mold lifting, and prevent the sand mold from falling off or causing damage or safety hazards. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the general-purpose chill for resin sand casting of this utility model; Figure 2 This is a front view of the general-purpose chill for resin sand casting according to this utility model.

[0018] In the diagram, 1. Cold iron body, 2. Strip handle, 3. Groove, 4. Annular groove. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1 This utility model relates to a general-purpose chill for resin sand casting, such as... Figure 1 As shown, the core includes the chill body 1, the strip handle 2 and the groove 3. The structural design of each component is designed to address the technical problems of traditional cylindrical chills. A single traditional cylindrical chill weighs 15 to 30 kg and lacks a dedicated gripping structure. Workers need to lift it or tie it with ropes when handling it, which is extremely labor-intensive.

[0021] Specifically, the chill body 1 is generally truncated cone-shaped, and a groove 3 is provided along the axial direction at the upper end of the chill body 1. The design of the groove 3 serves to balance the installation of the strip handle 2 and the core cooling function of the chill. Traditional chills, if additional gripping structures are provided, are mostly external protrusions, which are not only prone to bumping the casting during handling, but may also occupy the space of the cooling surface. The groove 3, on the other hand, houses the strip handle 2 inside the upper end of the chill body 1, which does not encroach on the cooling area at the lower end of the chill body 1 that contacts the casting, ensuring that the cooling area is not affected, and also provides a stable installation space for the strip handle 2, making the connection between the handle and the chill body 1 more snug and preventing the handle from breaking due to uneven external force.

[0022] The strip handle 2, installed in the groove 3, is fixedly connected to the chill body 1 at both ends. Its extension direction is perpendicular to the axis of the chill body 1, and its upper surface is flush with the upper surface of the chill body 1. This series of designs precisely solves the problem of traditional chill handling: traditional cylindrical chills have no dedicated gripping points, and workers need to lift them with both hands or tie them with ropes to carry them. This is not only labor-intensive, but also prone to slipping and causing the chills to fall or be misplaced. The vertical extension direction of the strip handle 2 is adapted to the natural gripping posture, and workers can apply force stably with one hand without the need for multiple people to cooperate, which greatly reduces the intensity of operation. At the same time, the design of the strip handle 2 being flush with the upper surface of the chill body 1 avoids the chill from interfering with other casting processes due to protrusion after placement, ensuring that the chill can stably fit the thick-walled plane of the casting and continue to play an efficient cooling role.

[0023] Example 2 This utility model relates to a general-purpose chill for resin sand casting, such as... Figure 1 and Figure 2 As shown, it includes a chill body 1, which is frustum-shaped. The upper diameter of the chill body 1 is larger than the lower diameter. A groove 3 is provided along the axial direction at the upper end of the chill body 1. A strip handle 2 is provided in the groove 3. The two ends of the strip handle 2 are fixedly connected to the chill body 1. The extension direction of the strip handle 2 is perpendicular to the axial direction of the chill body 1, and the upper surface of the strip handle 2 is flush with the upper surface of the chill body 1.

[0024] Furthermore, the depth of the groove at the upper end of the chill body 1 is set at 40mm. This 40mm groove depth is just enough to accommodate the strip handle 2, ensuring that the upper surface of the handle is flush with the upper surface of the chill body 1 after installation. If the groove of a traditional chill is too shallow, the strip handle 2 will not be able to be fully inserted and will protrude outwards, which will not only easily bump into the casting or sand mold during handling, but may also interfere with subsequent casting processes. If the groove is too deep, the handle will be embedded too deeply, making it difficult for the hand to reach in and grasp, thus losing the purpose of convenient operation. The 40mm depth provides sufficient space for the strip handle 2 to be inserted, allowing the handle and the chill body 1 to form a compact and close fit structure, avoiding protrusion and interference, while also allowing the worker's fingers to easily reach into the groove and grasp the handle, ensuring convenient gripping.

[0025] From the perspective of ensuring structural connection stability, the 40mm groove depth provides sufficient fixed contact area for both ends of the strip handle 2, making the connection between the handle and the chilled iron body 1 more stable. The chilled iron weighs 15-30Kg, and the handle needs to withstand a large pulling force during handling. If the groove is too shallow, the connection surface between the handle and the chilled iron body 1 will be too small, which may cause the handle to loosen or break due to concentrated force. The 40mm depth allows both ends of the handle to fit fully against the inner wall of the groove, dispersing the pulling force during handling and ensuring that the handle is not easily damaged even if it bears the weight of the chilled iron for a long time, thus ensuring operational safety.

[0026] From the perspective of balancing the core cooling function of the chill, a groove depth of 40mm will not affect the overall structure of the chill body 1 and the lower cooling surface. If the groove is too deep, it will excessively weaken the upper thickness of the chill body 1, which may not only reduce the overall mechanical strength of the chill, but also indirectly affect the heat transfer efficiency.

[0027] Example 3 Based on Embodiment 2 above, the height of the chill body 1 of this utility model is not less than 120mm.

[0028] From the perspective of ensuring a quenching effect, a height of at least 120mm provides sufficient volume and heat capacity for the chill body 1. Thick-section castings have large walls and concentrated heat, requiring the chill to continuously and rapidly absorb heat to accelerate cooling. If the chill is too short, its volume and heat capacity will be insufficient, and it will easily be heated to saturation by the casting's heat in a short time, losing its subsequent quenching capacity. This results in shrinkage cavities and porosity in the thick-walled areas of the casting due to slow cooling. A height of at least 120mm ensures that the chill stores sufficient cold energy, continuously and efficiently absorbing heat from the casting, maintaining a stable cooling rate, and thoroughly meeting the quenching requirements of the thick-walled areas of the casting, avoiding the insufficient quenching problem of traditional short chills.

[0029] From the perspective of extending the service life, this height allows for sufficient machining allowance for the chill. During the use of the chill, the surface in contact with the casting at the lower end will gradually develop carbonized pits due to high-temperature pouring. This requires machining to remove the surface layer, typically 5-8mm, to restore a smooth cooling surface. If the chill is too short, it will be scrapped after only 1-2 machining operations due to insufficient height and reduced cooling area. A height of not less than 120mm can support multiple machining operations. Even with the cumulative removal of tens of millimeters of thickness, sufficient height and effective cooling area can still be maintained, significantly extending the service life of the chill and reducing the cost waste caused by frequent chill replacements, thus meeting the need for "saving production costs".

[0030] Example 4 This utility model relates to a general-purpose chill for resin sand casting, such as... Figure 1 As shown, it includes a chill body 1, and the height of the chill body 1 is not less than 120mm.

[0031] The chill body 1 is shaped like a frustum. The diameter of the upper end of the chill body 1 is larger than that of the lower end. A groove 3 is provided along the axial direction at the upper end of the chill body 1. A strip handle 2 is provided in the groove 3. The two ends of the strip handle 2 are fixedly connected to the chill body 1. The extension direction of the strip handle 2 is perpendicular to the axial direction of the chill body 1. The upper end face of the strip handle 2 is flush with the upper end face of the chill body 1.

[0032] Furthermore, the depth of the groove at the upper end of the chill body 1 is 40mm.

[0033] Furthermore, the chill body 1 is made of gray cast iron as the core material and is integrally formed using a resin sand foam molding process.

[0034] From a material properties perspective, gray cast iron is one of the optimal choices for meeting the cooling function and strength requirements of chills. While traditional chills made of ordinary cast steel have higher strength, their thermal conductivity is significantly weaker than that of gray cast iron. This makes them unable to quickly absorb the concentrated heat from thick-walled areas of the casting, leading to insufficient cooling efficiency and residual shrinkage cavities and porosity defects. If non-metallic cooling materials are used, they cannot withstand the impact of handling 15-30 kg chills, easily breaking during handling or placement. Gray cast iron, on the other hand, possesses excellent thermal conductivity, rapidly transferring heat from the casting to ensure efficient cooling of thick-walled areas. It also has sufficient mechanical strength to withstand the gripping force during handling, the high-temperature impact during casting, and mechanical wear from repeated use. It is not easily deformed or broken, meeting the requirements for multiple cycles of chill use and avoiding the cooling failure or frequent scrapping problems caused by the performance imbalance of traditional materials.

[0035] From a casting process perspective, resin sand foam mold casting solves the precision defects and structural risks of traditional sand casting. Traditional chill casting often suffers from insufficient structural precision due to uneven sand mold compaction and mold fitting deviations; for example, deviations in the angle of the frustum-shaped bevel, inaccurate dimensions of the upper groove, or gaps at the joint between the handle and the body not only affect the fit between the chill and the thick-walled plane of the casting, but also pose a risk of handle breakage and chill falling during handling due to a weak connection between the handle and the body. In contrast, resin sand foam mold casting, through pre-forming with a foam mold, can accurately replicate the frustum structure, upper groove, and design dimensions of the handle of the chill body 1, ensuring that the angle of the frustum bevel is compliant, the groove depth is accurate, and the handle and chill body 1 are integrally formed without splicing, eliminating gaps or weak connection points and completely avoiding the problem of handle breakage.

[0036] Meanwhile, this process keeps the surface of the chills flat and smooth, especially the chilled surface that contacts the casting at the bottom. It can meet the fitting requirements without additional machining, ensuring that the chilled surface is in close contact with the thick-walled area of ​​the casting, without affecting the heat conduction efficiency, and further guaranteeing the chilling effect. At the same time, this process has strong dimensional stability, enabling mass production of chills, and each batch of chills has a consistent structure, which is suitable for the standardized chilling requirements of thick-section castings, avoiding the problems of inconsistent chill specifications and misuse caused by the precision fluctuations of traditional processes.

[0037] Example 5 Based on Embodiment 4 above, the cross-sectional dimensions of the strip handle 2 of this utility model are 20mm × 25mm.

[0038] The 20mm×25mm cross-sectional size provides sufficient support for the handle. During the handling of the chilled iron, the strip handle 2 needs to bear the entire weight of the chilled iron body 1. If the cross-sectional size is too small, the connection between the handle and the chilled iron body 1 is prone to breakage due to stress concentration. The 20mm×25mm cross-section can evenly distribute the tensile force to the entire handle. Combined with the one-piece molded structure of the handle and the chilled iron body 1, it can stably withstand the continuous tensile force brought by the weight of the chilled iron. Even with long-term and frequent use, the handle is not prone to deformation or breakage, ensuring operational safety.

[0039] Furthermore, the single-sided slope of the chill body 1 is set to 3°~6°. From the perspective of the self-locking principle of the "larger at the top and smaller at the bottom + sloped surface" structure, the single-sided slope of the frustum-shaped chill forms a natural "inverted cone fit" with the sand mold. When molding with resin sand, when the chill is placed vertically into the sand mold, its slope will fit tightly with the sand mold. Because the chill is "larger at the top and smaller at the bottom", after being placed, the upper end of the chill will naturally "lock" in the sand mold, preventing it from sliding down on its own after molding.

[0040] Example 6 Based on Embodiment 5 above, this embodiment has an annular groove 4 specially provided in the middle of the chilled iron body 1 of this utility model, and the height of the annular groove 4 is set to 10mm~20mm and the depth is set to 10mm.

[0041] Traditional cylindrical chills have smooth surfaces and, after being placed in the resin sand mold, only connect with the mold through planar contact. During demolding, vibrations or the chill's own weight can easily cause them to detach from the mold and fall, potentially damaging the mold and requiring rework, as well as posing safety hazards. In contrast, the annular groove 4 allows the resin sand to naturally fill the groove after the chill is placed in the mold. Once the mold has solidified, the filling sand and the annular groove 4 form a strong mechanical interlocking structure: the inner wall of the groove creates a "locking" constraint on the sand, while the sand, in turn, provides lateral support to the chill. This interlocking relationship replaces the traditional planar contact, effectively resisting the vibration and impact forces during demolding, as well as the chill's own weight.

[0042] In addition, the annular groove 4 is set in the middle of the chill body 1, which neither occupies the installation space of the upper groove 3 and the strip handle 2, nor covers the cooling surface that contacts the casting at the lower end. It perfectly avoids the operating area and functional area of ​​the chill, achieving a balance between "anti-falling" and "convenient operation and efficient cooling", further adapting to the casting production needs of thick and large cross-section castings.

[0043] Finally, it should be noted that in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0045] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A general-purpose chill for resin sand casting, characterized in that, Includes a chill body (1), which is frustum shaped. The upper diameter of the chill body (1) is larger than the lower diameter. A groove (3) is provided on the upper end of the chill body (1) along the axial direction. A strip handle (2) is provided in the groove (3). The two ends of the strip handle (2) are fixedly connected to the chill body (1). The extension direction of the strip handle (2) is perpendicular to the axial direction of the chill body (1). The upper surface of the strip handle (2) is flush with the upper surface of the chill body (1).

2. The general-purpose chill for resin sand casting according to claim 1, characterized in that, The depth of the groove at the upper end of the chill body (1) is 40mm.

3. The general-purpose chill for resin sand casting according to claim 1, characterized in that, The height of the chill body (1) is not less than 120mm.

4. The general-purpose chill for resin sand casting according to claim 1, characterized in that, The chill body (1) is made of gray cast iron and is cast using resin sand foam molding.

5. The general-purpose chill for resin sand casting according to claim 1, characterized in that, The chilled iron body (1) and the strip handle (2) are integrally formed.

6. The general-purpose chill for resin sand casting according to claim 1, characterized in that, The cross-sectional dimensions of the strip handle (2) are 20mm × 25mm.

7. The general-purpose chill for resin sand casting according to claim 1, characterized in that, The single-sided slope of the chill body (1) is 3°~6°.

8. The general-purpose chill for resin sand casting according to claim 1, characterized in that, The cold iron body (1) has an annular groove (4) in the middle, the height of the annular groove is 10mm~20mm, and the depth of the annular groove (4) is 10mm.

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