Rapid cooling mechanism of crankshaft iron mold sand covering casting mold

Abstract

The utility model relates to a rapid cooling mechanism of a crankshaft iron mold sand-coated casting mold, which belongs to the technical field of sand-coated casting and comprises an upper mold, a lower mold and cooling components respectively arranged in the upper mold and the lower mold. According to the rapid cooling mechanism of the crankshaft iron mold sand covering casting mold, the cooling fins and the cooling airflow channel are arranged in the mold, the cooling speed of a casting can be effectively increased, the cooling fins make direct contact with covering sand, heat of the casting is rapidly conducted to the cooling fins, then the heat is taken away through cooling airflow, the heat exchange efficiency is remarkably improved, and the service life of the casting is prolonged. And cooling airflow is uniformly distributed in the mold, so that each part of the casting can be uniformly cooled, the defects of shrinkage cavities, shrinkage porosity and the like caused by different local cooling speeds are avoided, the overall quality and compactness of the casting are improved, the dimensional deviation caused by thermal stress is reduced, and the dimensional precision and interchangeability of the casting are improved.

Description

Technical Field

[0001] This utility model relates to the field of sand casting technology, specifically a rapid cooling mechanism for a crankshaft iron mold sand casting mold. Background Technology

[0002] Iron mold sand casting is a special casting process that combines the advantages of metal mold casting and sand casting. Specifically, iron mold sand casting involves covering the inner surface of a metal cast iron mold (iron mold) with a thin layer of molding sand (usually coated sand) to form a mold, which is then poured to produce castings.

[0003] When castings are made using sand casting without rapid cooling, the quality of the casting may be affected. This is because, without a rapid cooling component, the casting cannot dissipate heat quickly during solidification, resulting in a significant decrease in cooling rate. This leads to a decrease in the density of the casting and the possible appearance of defects such as shrinkage cavities and porosity, which in turn affects the mechanical properties of the casting. Therefore, a rapid cooling mechanism for crankshaft sand casting molds is proposed to solve the above-mentioned technical problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a rapid cooling mechanism for a crankshaft iron mold sand casting mold, which has the advantages of rapid cooling. It solves the problem in existing technologies where castings cannot dissipate heat quickly during solidification, resulting in a significant reduction in cooling rate, which leads to a decrease in the density of the casting and the possible occurrence of defects such as shrinkage cavities and porosity, thereby affecting the mechanical properties and quality of the casting.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a rapid cooling mechanism for a crankshaft iron mold sand casting mold, comprising an upper mold and a lower mold, and cooling components respectively disposed inside the upper mold and the lower mold;

[0006] The cooling assembly includes two sets of partitions and several sets of heat sinks. The two sets of partitions are horizontally arranged inside the upper mold and the lower mold, respectively. Several sets of downward-through connection ports are opened on the outer side of the two sets of partitions. The several sets of heat sinks are slidably arranged inside the several sets of connection ports to guide the heat in the sand covering to be discharged outward to accelerate cooling. There are sliding holes on opposite sides of the upper mold and the lower mold. Push rods are slidably arranged inside the sliding holes. Reset plates located inside the upper mold and the lower mold are fixed at opposite ends of the push rods to push the several sets of heat sinks to a designated position.

[0007] The cooling assembly also includes air inlets on the right side of the upper mold and the lower mold, and air inlets are provided inside both sets of air inlets. An air inlet pipe is connected to the outside of the upper air inlet shroud to guide the cooling airflow into the upper mold, and a guide pipe is connected to the outside of the lower air inlet shroud to guide the cooling airflow into the lower mold.

[0008] Furthermore, the outer sides of the upper mold and the lower mold are fitted with ring hoops to improve the connection tightness between the two sets of molds.

[0009] Furthermore, a sealing ring is provided between the connection port and the side opposite to the heat sink to prevent sand from falling along the connection port.

[0010] Furthermore, limit rings are provided on the outer side of both sets of push rods to limit the path length of the push rods.

[0011] Furthermore, the top end of the guide pipe is connected to a pipe joint with an inner diameter larger than that of the air inlet pipe, so as to connect the guide pipe to the air inlet pipe.

[0012] Furthermore, the pipe joint is provided with a sealing sleeve with an inner diameter equal to that of the air inlet pipe to enhance the sealing performance at the connection between the guide pipe and the air inlet pipe.

[0013] Furthermore, both the upper mold and the lower mold have exhaust vents on their left sides that are flush with the air inlet, and both sets of exhaust vents are equipped with dustproof nets inside.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0015] The rapid cooling mechanism of this crankshaft iron mold sand-coated casting mold effectively accelerates the cooling rate of the casting by setting heat sinks and cooling airflow channels inside the mold. The heat sinks are in direct contact with the sand coating, rapidly transferring the heat of the casting to the heat sinks, and then the heat is carried away by the cooling airflow, significantly improving the heat exchange efficiency and enabling the casting to solidify faster. The cooling airflow is evenly distributed inside the mold, ensuring uniform cooling of all parts of the casting and avoiding defects such as shrinkage cavities and porosity caused by different local cooling rates. This improves the overall quality and density of the casting. Due to the fast and uniform cooling rate, the casting has minimal deformation during solidification, better maintaining the design dimensions, reducing dimensional deviations caused by thermal stress, and improving the dimensional accuracy and interchangeability of the casting. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a rear view of the structure of this utility model;

[0018] Figure 3 This is a cross-sectional view of the cooling component of this utility model;

[0019] Figure 4 This is an exploded view of the cooling component of this utility model;

[0020] Figure 5 This is a schematic diagram showing the connection between the air inlet pipe and the guide pipe of this utility model;

[0021] Figure 6 This is a schematic diagram of the guide tube of this utility model.

[0022] In the diagram: 1. Upper mold; 2. Lower mold; 3. Cooling assembly; 31. Partition plate; 32. Heat sink; 33. Connection port; 34. Sliding hole; 35. Push rod; 36. Reset plate; 37. Air inlet; 38. Air inlet cover; 39. Air inlet pipe; 310. Guide pipe; 311. Pipe joint. Detailed Implementation

[0023] 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. Example

[0024] Please see Figure 1-3 The rapid cooling mechanism of a crankshaft iron mold sand casting mold in this embodiment includes an upper mold 1 and a lower mold 2, and cooling components 3 respectively disposed inside the upper mold 1 and the lower mold 2.

[0025] In this embodiment, the outer sides of the upper mold 1 and the lower mold 2 are fitted with ring hoops to improve the connection tightness between the two sets of molds. The ring hoops are fitted on the outer sides of the upper mold 1 and the lower mold 2. The function of the ring hoops is to improve the connection tightness between the two sets of molds, to ensure that the molds will not loosen or misalign during the casting process, thereby ensuring the dimensional accuracy and forming quality of the castings. Example

[0026] Based on Example 1, please refer to Figure 1-6In this embodiment, the cooling component 3 includes two sets of partitions 31 and several sets of heat sinks 32. The two sets of partitions 31 are horizontally arranged inside the upper mold 1 and the lower mold 2, respectively. The partitions 31 divide the internal space of the upper mold 1 and the lower mold 2 into upper and lower layers. The upper space is used for sand coating and shaping according to the casting model. That is, the space is filled with coated sand and compacted and shaped according to the shape of the casting to form the cavity of the casting. The lower space is specifically used for the inflow of cooling airflow. Several sets of downward penetrating connection ports 33 are opened on the outer side of both sets of partitions 31. Several sets of heat sinks 32 are slidably arranged inside the several sets of connection ports 33 to guide the heat in the coated sand to the outside to accelerate cooling. After the upper mold 1 and the lower mold 2 are filled with coated sand, the coated sand is located on the outer side of the several sets of heat sinks 32. During the shaping of the sand coating, the corresponding heat sink 32 is simultaneously pushed to slide along the connection port 33 so that the sand coating can better fit the shape of the casting model and prepare for the subsequent cooling process. There are sliding holes 34 on the opposite sides of the upper mold 1 and the lower mold 2, and push rods 35 are slidably installed inside the two sets of sliding holes 34. The opposite ends of the two sets of push rods 35 are fixedly installed with reset plates 36 located inside the upper mold 1 and the lower mold 2, respectively, to push several sets of heat sinks 32 to the designated positions.

[0027] The cooling assembly 3 also includes air inlets 37 on the right side of the upper mold 1 and the lower mold 2, and air inlets 37 are provided with air inlet hoods 38 inside both sets of air inlets 37. An air inlet pipe 39 is connected to the outside of the upper air inlet hood 38 to guide the cooling airflow into the upper mold 1, and a guide pipe 310 is connected to the outside of the lower air inlet hood 38 to guide the cooling airflow into the lower mold 2.

[0028] In this embodiment, a sealing ring is provided between the connection port 33 and the side opposite to the heat sink 32 to prevent sand from falling along the connection port 33. The sealing ring between the connection port 33 and the side opposite to the heat sink 32 can effectively prevent sand from falling along the connection port 33 and prevent sand from entering other areas inside the mold, affecting the normal operation of the cooling component 3 and the molding quality of the casting. Limiting rings are provided on the outer sides of both sets of push rods 35 to limit the path length of the push rods 35. The top end of the guide pipe 310 is connected to a pipe joint 311 with an inner diameter larger than that of the air inlet pipe 39 to connect the guide pipe 310 and the air inlet pipe 39.

[0029] It should be noted that the air inlet end of the upper air inlet pipe 39 is connected to an external fan or other equipment. The external fan provides power, causing the cooling airflow to enter the system of the upper mold 1 along the air inlet pipe 39. The cooling airflow enters the air inlet shroud 38 of the upper mold 1 through the upper air inlet pipe 39, and then is evenly distributed to the lower space of the upper mold 1 through the air inlet shroud 38. At the same time, the lower guide pipe 310 is connected to the air inlet shroud 38 of the lower mold 2. The cooling airflow enters the air inlet shroud 38 of the lower mold 2 through the guide pipe 310, and then is evenly distributed to the lower space of the upper mold 1 through the air inlet shroud 38. The airflow is guided to the lower space of the lower mold 2, so that the cooling airflow can be evenly distributed in the lower space of the upper mold 1 and the lower mold 2, providing sufficient airflow for the cooling of the casting. The airflow entering the lower space of the mold will flow through several sets of heat sinks 32. One end of the heat sink 32 is inserted into the sand covering and in contact with the casting, which can conduct the heat of the casting to the heat sink 32. Under the drive of the cooling airflow, the heat on the heat sink 32 exchanges heat with the airflow, realizing the transfer and dissipation of heat, thereby accelerating the cooling speed of the casting.

[0030] In this embodiment, the pipe joint 311 is provided with a sealing sleeve with an inner diameter equal to that of the air inlet pipe 39 to enhance the sealing at the connection between the guide pipe 310 and the air inlet pipe 39. The left side of both the upper mold 1 and the lower mold 2 is provided with an exhaust port that is flush with the position of the air inlet 37, and both sets of exhaust ports are provided with a dustproof net. The function of the dustproof net is to prevent external dust and other impurities from entering the mold through the exhaust port, keep the mold clean, ensure the purity of the cooling airflow, and avoid contamination of the casting surface.

[0031] Furthermore, the hot air rises in temperature after heat exchange and is discharged from the exhaust vent to the outside of the mold, completing the entire cooling cycle. The exhaust vent is located on the left side of the upper mold 1 and the lower mold 2, and a dustproof screen is installed inside the exhaust vent to prevent external dust and other impurities from entering the mold.

[0032] It should be noted that limit rings are provided on the outer sides of both sets of push rods 35 to limit the path length of the push rods 35. The push rods 35 are slidably set in the sliding holes 34 on the outer side of the mold, and one end of them is connected to the reset plate 36. The reset plate 36 is located inside the mold. By pushing the push rods 35, the reset plate 36 will drive the heat sink 32 to slide along the connection port 33, thereby changing the distance and relative position between the heat sink 32 and the casting to achieve the best cooling effect.

[0033] The working principle of the above embodiments is as follows:

[0034] The partition 31 divides the internal space of the upper mold 1 and the lower mold 2 into two layers. The upper space is used for sand coating and shaping according to the casting model. That is, the space is filled with coated sand and compacted and shaped according to the shape of the casting to form the cavity of the casting. The lower space is specifically used for the inflow of cooling airflow. After the upper mold 1 and the lower mold 2 are filled with coated sand, the coated sand is located on the outside of several sets of heat sinks 32. During the shaping of the sand coating, the corresponding heat sink 32 is simultaneously pushed to slide along the connection port 33 so that the sand coating can better conform to the shape of the casting model, and at the same time prepare for the subsequent cooling process, ensuring that the heat sink 32 can effectively contact the sand coating and guide the heat outward. The air inlet end of the upper air inlet pipe 39 is connected to external fans and other equipment. The external fans provide power so that the cooling airflow enters the system of the upper mold 1 along the air inlet pipe 39. The cooling airflow enters the air inlet shroud 38 of the upper mold 1 through the upper air inlet pipe 39, and then is evenly distributed to the lower space of the upper mold 1 through the air inlet shroud 38. At the same time, the lower guide pipe 310 is connected to the air inlet shroud 38 of the lower mold 2. The cooling airflow enters the air inlet shroud 38 of the lower mold 2 through the guide pipe 310, and then is evenly distributed to the lower space of the upper mold 1 through the air inlet shroud 38. The cooling airflow is guided to the lower space of the upper mold 1 and the lower mold 2 by the cover 38. This allows the cooling airflow to be evenly distributed in the lower space of the upper mold 1 and the lower mold 2, providing sufficient airflow for cooling the casting. The airflow entering the lower space of the mold flows through several sets of heat sinks 32. One end of the heat sink 32 is inserted into the sand covering and contacts the casting, which can conduct the heat of the casting to the heat sink 32. Driven by the cooling airflow, the heat on the heat sink 32 exchanges heat with the airflow, realizing the transfer and dissipation of heat, thereby accelerating the cooling speed of the casting. After the heat exchange, the temperature of the hot air rises and is discharged from the exhaust port to the outside of the mold, completing the entire cooling cycle. The exhaust port is located on the left side of the upper mold 1 and the lower mold 2, and a dustproof net is installed inside the exhaust port to prevent external dust and other impurities from entering the mold.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 limitations, 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 the element.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A rapid cooling mechanism for a crankshaft iron mold sand casting mold, characterized in that: It includes an upper mold (1) and a lower mold (2), and cooling components (3) respectively disposed inside the upper mold (1) and the lower mold (2); The cooling assembly (3) includes two sets of partitions (31) and several sets of heat sinks (32). The two sets of partitions (31) are horizontally arranged inside the upper mold (1) and the lower mold (2), and several sets of downward through-holes (33) are opened on the outer side of the two sets of partitions (31). Several sets of heat sinks (32) are slidably arranged inside the several sets of through-holes (33) to guide the heat in the sand cover to be discharged outward to accelerate cooling. There are sliding holes (34) on the opposite side of the upper mold (1) and the lower mold (2), and push rods (35) are slidably arranged inside the two sets of sliding holes (34). The opposite ends of the two sets of push rods (35) are fixedly arranged with reset plates (36) located inside the upper mold (1) and the lower mold (2), respectively, to push several sets of heat sinks (32) to a designated position. The cooling assembly (3) also includes air inlets (37) on the right side of the upper mold (1) and the lower mold (2), and air inlets (38) are provided inside both sets of air inlets (37). An air inlet pipe (39) is connected to the outer side of the upper air inlet pipe (38) to guide the cooling airflow into the upper mold (1), and a guide pipe (310) is connected to the outer side of the lower air inlet pipe (38) to guide the cooling airflow into the lower mold (2).

2. The rapid cooling mechanism for a crankshaft iron mold sand casting mold according to claim 1, characterized in that: The outer sides of the upper mold (1) and the lower mold (2) are fitted with ring hoops to improve the connection tightness between the two sets of molds.

3. The rapid cooling mechanism for a crankshaft iron mold sand casting mold according to claim 2, characterized in that: A sealing ring is provided between the connection port (33) and the side opposite to the heat sink (32) to prevent sand from falling along the connection port (33).

4. The rapid cooling mechanism for a crankshaft iron mold sand casting mold according to claim 3, characterized in that: Both sets of push rods (35) are provided with limit rings on their outer sides to limit the path length of the push rods (35).

5. The rapid cooling mechanism for a crankshaft iron mold sand casting mold according to claim 4, characterized in that: The top end of the guide pipe (310) is connected to a pipe joint (311) with an inner diameter larger than that of the air inlet pipe (39) for connecting the guide pipe (310) and the air inlet pipe (39).

6. The rapid cooling mechanism for a crankshaft iron mold sand casting mold according to claim 5, characterized in that: The pipe joint (311) is provided with a sealing sleeve with an inner diameter equal to that of the air inlet pipe (39) to enhance the sealing at the connection between the guide pipe (310) and the air inlet pipe (39).

7. The rapid cooling mechanism for a crankshaft iron mold sand casting mold according to claim 6, characterized in that: The upper mold (1) and the lower mold (2) are both provided with exhaust ports on the left side that are flush with the air inlet (37), and both sets of exhaust ports are provided with dustproof nets inside.

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