Quenching assembly and sand core provided with same
By using cold iron with hollow structure and cooling components with connecting pipes during the casting process, the problems of low production efficiency and casting defects of complex parts are solved, and efficient cooling effect is achieved and production costs are reduced.
Patent Information
- Application Number
- CN202422090618.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-08-28
AI Technical Summary
When casting complex parts, the use of large amounts of cold iron or risers leads to low production efficiency, difficulty in cleaning and prone to casting defects.
The cooling component consisting of a hollow structure and a cooling component composed of a connecting pipe and a condensing gas tank is used to transport the condensed gas into the cold iron through the connecting pipe. Combined with the air channel design, efficient cooling of the castings is achieved.
Continuous cooling of small areas of complex parts is achieved, reducing the use of risers, reducing production costs and complexity, and preventing thin-wall defects of castings caused by excessive cold iron.
Smart Images
Figure CN223083785U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of casting, in particular to a chill appliance. Background Art
[0002] With the highly lightweight and integrated industrial design, the wall thickness of the main body of many parts has become thinner and thinner, and the thickness difference of the parts has become larger and larger. During casting, the hot spots of the parts have become more and more dispersed. Currently, there are mainly the following 3 methods for casting complex parts.
[0003] 1) In the production of part casting, more chills or larger chills need to be used to chill the hot spot area.
[0004] 2) In the production of part casting, more risers or larger risers are used to compensate for shrinkage at the hot spot position.
[0005] 3) In the production of part casting, method 1 and method 2 are combined for production.
[0006] When using the above methods to cast products with complex structures, there are mainly problems such as difficulty in removing risers during part cleaning, large consumption of chills, resulting in low production efficiency, and casting defects prone to occur on the chill usage surface. Summary of the Invention
[0007] In view of the problems of increased difficulty in subsequent operations, low production efficiency, and increased casting defects caused by the need to set more chills to achieve the chilling effect in the casting of the above complex parts, it is necessary to propose a chill assembly and a core equipped with the chill assembly.
[0008] A chill assembly includes a chill with a hollow structure, a connecting pipe, and a condensate gas tank. The chill with the hollow structure is used to be set at the position where the chill needs to be configured in the core. One end of the connecting pipe is connected to the chill, and the other end is connected to the condensate gas tank, and is used to transport the condensate gas in the condensate gas tank into the chill with the hollow structure to enhance the chilling effect of the chill; the chill with the hollow structure is used to chill the molten metal, the connecting pipe is used to transport the condensate gas, and the condensate gas tank is used to store the liquid condensate gas; the connecting pipe is arranged between the chill with the hollow structure and the condensate gas tank, and is used to introduce the condensate gas in the condensate gas tank into the chill with the hollow structure of the sand sample.
[0009] Further, the connecting pipe can be a flexible pipe, which is more conducive to the setting of the chill assembly, that is, the connecting pipe is a connecting flexible pipe.
[0010] Further, the condensate gas tank can be a liquid nitrogen storage tank. The nitrogen in the liquid nitrogen storage tank enters the chill with the hollow structure through the connecting pipe, enhancing the cooling effect of the chill with the hollow structure and achieving the purpose of the utility model.
[0011] Further, at least one channel is provided in the chill with a hollow structure to quench the chill with a hollow structure by the condensed gas. Specifically, the hollow structure may be a hollow channel with a circular cross-section, leading from one end face of the chill to the other end face. A plurality of the hollow structures may be independently arranged in the chill or may be arranged in the chill in an interleaved manner.
[0012] A core equipped with the quenching assembly includes a core body, a chill placement space, and a ventilation passage. The chill placement space is arranged at a position on the core body corresponding to the part of the casting that needs to be quenched. One end of the ventilation passage leads to the core surface and communicates with the atmosphere, and the other end of the ventilation passage leads to the chill placement space and communicates with the chill placement space. The chill placement space is used to place the chill with a hollow structure, and the hollow structure is aligned with the port of the ventilation passage leading to the chill placement space. At least one port of the end of the ventilation passage leading to the core body surface is connected to the connecting pipe, so as to convey the cold air in the condensation gas tank into the ventilation passage, that is, through the ventilation passage, the condensed gas is input into the chill with a hollow structure. The condensed gas passing through the chill with a hollow structure is discharged into the atmosphere through the other port of the ventilation passage, thereby effectively improving the quenching effect of the same chill and avoiding the problem of the need to set many and large chills.
[0013] Further, at least one ventilation passage leading to each chill placement space is provided to ensure that at least one of the hollow structures can be passed with condensed gas.
[0014] Further, the ventilation passage is provided with an intake passage and an exhaust passage. One end of the intake passage leads to the chill placement space, and the other end of the intake passage leads to the core body surface and communicates with the atmosphere. The end of the intake passage leading to the core body surface is connected to the connecting pipe to introduce the condensed gas into the ventilation passage. One end of the exhaust passage leads to the chill placement space, and the other end of the exhaust passage leads to the core body surface and communicates with the atmosphere to discharge the overheated condensed gas passing through the chill out of the core body, avoiding the influence of the overheated gas on the temperature field of the molten metal.
[0015] Furthermore, the intake passage is closer to the casting cavity than the exhaust passage. On the one hand, it improves the quenching effect of the condensed gas on the casting. On the other hand, the exhaust passage is far from the casting cavity, which also avoids the secondary interference of heat.
[0016] Furthermore, a buckle for clamping the connecting pipe is provided in the intake passage of the ventilation passage to fix the connecting pipe.
[0017] A quenching method includes
[0018] S01, fabricate a sand core;
[0019] S02, assemble a chill with a hollow structure;
[0020] S03, assemble the core and snap the connecting pipe onto the air vent passage;
[0021] S04, after pouring is completed, open the condensate gas tank to allow the condensate gas to enter the sand core, achieving the chilling effect on the casting cavity.
[0022] The beneficial effects of the technical solution of the present utility model: It realizes continuous chilling of the narrow area of the sand core, reduces the number of risers used, lowers the production cost and the complexity of the production process, and effectively prevents the defects in the thin walls of the casting caused by excessive chills. Description of the Drawings
[0023] Figure 1 is a three-dimensional schematic diagram of the application state of the chilling assembly;
[0024] Figure 2 is a schematic cross-sectional view of the sand core;
[0025] Among them, 1 - a chill with a hollow structure; 2 - a connecting pipe; 3 - a condensate gas tank; 4 - a sand core body; 5 - an air vent passage; 6 - a chill configuration space. Detailed Embodiments
[0026] To more clearly illustrate the technical solution of the present utility model, the technical solution of the invention content will be described in detail in combination with the drawings. Obviously, the following description is some typical embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other solutions can also be obtained according to these embodiments.
[0027] Taking the sand core printed by additive manufacturing technology as an example, the implementation manner of the technical solution of the present utility model will be elaborated in detail.
[0028] An implementation manner, the chilling assembly includes a chill 1 with a hollow structure, a connecting pipe 2, and a condensate gas tank 3. The connecting pipe 2 is used to connect the chill 1 with a hollow structure and the condensate gas tank 3. The condensate gas in the condensate gas tank 3 enters the chill 1 with a hollow structure through the connecting pipe 2, effectively improving the chilling effect of the chill, reducing the number of chills required to be set at the same position, and avoiding the complexity of subsequent cleaning processes.
[0029] As a supplement to this implementation manner, the connecting pipe 2 is made of a flexible material, that is, in this implementation manner, the connecting pipe 2 is a connecting hose, which facilitates the routing of the connecting line and can also be more widely applicable to various scenarios.
[0030] As a supplement to this embodiment, the condensate gas tank 3 is a liquid nitrogen storage tank. Nitrogen gas volatilized from liquid nitrogen enters the chill block 1 with a hollow structure through the connecting pipe 2 and the flow channel 5, so as to rapidly cool the chill block, thereby achieving the cooling of the molten metal in the casting cavity, that is, it can effectively change the temperature field of the molten metal and realize the rapid cooling of the molten metal by the chill block at the position of the molten metal.
[0031] As a supplement to this embodiment, the hollow structure is a hollow channel provided in the chill block. The cross-section of the hollow channel can be square, circular, etc., and the best cross-section is circular; the circular cross-section can better transport the condensate gas and rapidly cool the passing core.
[0032] As a further supplement to this embodiment, at least one hollow channel is provided in the chill block with the hollow structure; for example, one through hollow channel can be provided, or at least two non-interfering hollow channels can be provided, or at least two intersecting hollow channels can be provided. The intersection points of several hollow channels are one point, so that a condensate gas inlet can effectively introduce the condensate gas into each intersecting hollow channel, and the different air outlet ends are connected to the air flow channel 5, or can be integrated into one air outlet end and connected to the air flow channel 5. The chill block 1 with the hollow structure has multiple air outlet ends and multiple air inlet ends or only one air outlet end and one air inlet end. When only one air outlet end and one air inlet end are provided, the setting of the air flow channel 5 on the core 4 is simplified. Specifically, in one case, the hollow structure can be several non-communicating channels provided in the chill block, that is, each channel has an independent air inlet end and air outlet end; in another case, the hollow structure is several channels intersecting at one point, the intersection point is the air inlet end, and the end far from the intersection point is the air outlet end, achieving the effect that the condensate gas can be obtained by multiple channels with one-point air inlet, and the condensation rate is improved.
[0033] In another embodiment, the core equipped with the rapid cooling assembly includes a core body 4, a chill block configuration space 6 and an air flow channel 5. The chill block configuration space 6 is provided on the core body 4 for placing the chill block 1 with the hollow structure. The air flow channel 5 is buried in the core body 1, and one end of the air flow channel 5 leads to the surface of the core body 4 and communicates with the atmosphere, and the other end of the air flow channel 5 leads to the chill block configuration space 6 and communicates with the chill block configuration space 6. The air flow channel 5 is used to transport the condensate gas from the connecting pipe 2 to the chill block 1 with the hollow structure to ensure the smooth flow of the condensate gas.
[0034] As a supplement to this embodiment, the air vent 5 is provided with an air outlet channel and an air inlet channel; the air outlet channel is used to discharge the overheated condensed gas that has passed through the chill 1 with a hollow structure from the core body 4, so as to avoid the overheated condensed gas affecting the temperature field of the molten metal and causing unqualified casting metallography; one end of the air inlet channel leading to the surface of the core body 4 cooperates with the connecting pipe 2 to smoothly introduce the condensed gas in the connecting pipe 2 into the air inlet channel.
[0035] As a further supplement to this embodiment, the air inlet channels can be set to several non - communicating ones, and the number of the air inlet channels can be the same as the number of the chills 1 with a hollow structure, that is, each chill 1 with a hollow structure is provided with an independent air inlet channel. This setting method can make the condensed gas enter the chill 1 with a hollow structure at the fastest speed and achieve the fastest chilling effect.
[0036] As a further supplement to this embodiment, the air inlet channel can be provided with several branches. One end of the main trunk of the air inlet channel leads to the surface of the core body 4, and the other end of the air inlet channel is provided with several branches, and the end of each branch leads to the chill configuration space 6 and communicates with it. This setting method can simplify the setting of the air inlet channel. Especially for thin - wall cores, the air inlet channel can be set on the premise of ensuring the strength of the core.
[0037] As a further supplement to this embodiment, the air outlet channels can be set to several non - communicating ones, and the number of the air outlet channels can be the same as the number of the chills 1 with a hollow structure, that is, each chill 1 with a hollow structure is provided with an independent air outlet channel. This setting method can discharge the overheated condensed gas that has passed through the chill 1 with a hollow structure from the core body 4 at the fastest speed, and can effectively avoid the problem that the change of the temperature field of the molten metal is caused by the slow or unsmooth discharge of the overheated condensed gas.
[0038] As a further supplement to this embodiment, the air outlet channel can also be provided with several branches. One end of the main trunk of the air outlet channel leads to the chill configuration space 6, and the other end of the air outlet channel is provided with several branches, and the end of each branch leads to the surface of the core body 4. This setting method can simplify the setting of the air outlet channel. Especially for thin - wall cores, it can effectively ensure the strength of the core body.
[0039] As a supplement to this embodiment, the distance between the intake channel and the surface of the core body 4 for forming the casting cavity is less than the distance between the outlet channel and the surface of the core body 4 for forming the casting cavity, that is, the intake channel is closer to the casting cavity than the outlet channel. On the one hand, it enhances the chilling effect of the condensed gas on the casting. On the other hand, the outlet channel is far from the casting cavity, which also avoids secondary interference of heat.
[0040] As a supplement to this embodiment, one end of the air vent 5 cooperating with the connecting pipe 2 may be provided with a buckle, and the connecting pipe 2 is directly snap-fitted into the air vent 5, which improves the connection efficiency and facilitates the connection and disassembly of the connecting pipe 2.
[0041] Another embodiment, the chilling method of the chilling component includes,
[0042] S01, manufacturing a core; printing a core using an additive manufacturing device, and according to the positions where the casting needs to be chilled, arranging cold iron configuration spaces 6 at corresponding positions of the core and reserving air vents 5;
[0043] S02, assembling a cold iron with a hollow structure; assembling the cold iron 1 with a hollow structure into the cold iron configuration space 6, and making the hollow structure cooperate with the air vent 5 to keep the air flow channel unobstructed, so as to ensure that the condensed gas can reach the cold iron in time and improve the chilling effect of the cold iron;
[0044] S03, core assembly, and snap-fitting the connecting pipe onto the air vent; assembling each independent core completed by printing into a core package with a complete cavity structure, and snap-fitting the connecting pipe 2 onto the air vent 5 to keep the flow channel of the condensed gas unobstructed;
[0045] S04, after pouring is completed, open the condensed gas tank to allow the condensed gas to enter the core and achieve the chilling effect on the casting cavity.
[0046] As a supplement to this embodiment, for the core manufactured in S01, after sand cleaning and coating, before it can be transferred to S02, in particular, the loose sand and floating sand in the air vent 5 need to be cleaned up to avoid blockage of the air vent 5, preventing the condensed gas from entering the cold iron, resulting in problems such as poor condensation effect and imbalance of the metal liquid temperature field, and causing unqualified casting metallography.
[0047] As a supplement to this embodiment, the method of introducing the condensed gas in S04 is,
[0048] S11, open the air vent valve provided on the condensed gas tank 3 to allow the condensed gas to enter the air vent 5 through the connecting pipe 2;
[0049] S12. Adjust the regulating valve of the ventilation valve on the condensation gas tank 3 according to the real-time temperature of the molten metal, so as to adjust the flow rate of the condensation gas entering the ventilation duct 5 and the chill with a hollow structure, so as to ensure that the temperature field of the molten metal meets the condensation temperature of the casting metallography.
[0050] As a further supplement to this embodiment, the ventilation valve is an adjustable valve. The ventilation valve can be electronic or mechanical, and controls the ventilation flow rate of the ventilation valve according to the set adjustment amount.
[0051] Through the implementation of the present utility model, it is convenient to arrange the chills in the narrow areas of complex parts, and the chilling effect that requires large and multiple chills is achieved with smaller and fewer chills. This not only reduces the production cost, but also reduces the complexity of the production process and the defects caused by chilling of the product.
[0052] The above embodiments are only descriptions of a typical application of the technical solution of the present utility model. On the basis of being reasonable and not requiring creative labor, reasonable expansion can also be carried out.
Claims
1. A chill component, characterized in that, It includes a chill (1) with a hollow structure, a connecting pipe (2), and a condensate gas tank (3). The chill (1) with a hollow structure is used to rapidly cool the molten metal. The connecting pipe (2) is used to convey the condensate gas. The condensate gas tank (3) is used to store the liquid condensate gas. The connecting pipe (2) is arranged between the chill (1) with a hollow structure and the condensate gas tank (3) to introduce the condensate gas in the condensate gas tank (3) into the hollow structure of the chill in the sand sample.
2. The chill assembly according to claim 1, characterized in that The chill (1) with a hollow structure is provided with a number of non - communicating hollow channels.
3. The chill assembly according to claim 1, wherein The chill (1) with a hollow structure is provided with a number of hollow channels intersecting at one point.
4. A sand core equipped with a chill assembly as described in any one of claims 1-3, characterized in that, It includes a sand core body (4), a chill configuration space (6), and a ventilation passage (5). The chill configuration space (6) is arranged at the part of the sand core body (4) corresponding to the position where the casting needs to be rapidly cooled. One end of the ventilation passage (5) leads to the sand core surface and communicates with the atmosphere. The other end of the ventilation passage (5) leads to the chill configuration space (6) and is in communication with it.
5. The sand core equipped with the chill assembly according to claim 4, characterized in that, The ventilation passage (5) is provided with an intake passage and an exhaust passage. One end of the intake passage leads to the chill configuration space (6), and the other end of the intake passage leads to the surface of the sand core body (4) and communicates with the atmosphere. The end of the intake passage leading to the sand core surface is connected to the connecting pipe (2). One end of the exhaust passage leads to the chill configuration space (6), and the other end of the exhaust passage leads to the surface of the sand core body (4) and communicates with the atmosphere.
6. The sand core equipped with the chilling assembly as described in claim 5, characterized in that, The intake passage is arranged as a number of non - communicating ones, and the number of the intake passages is the same as the number of the chills (1) with a hollow structure.
7. The sand core equipped with the chilling assembly as described in claim 5, characterized in that, The intake passage can be provided with a number of branches. One end of the main trunk of the intake passage leads to the surface of the sand core body (4), and the other end of the intake passage is provided with a number of branches. The end of each branch leads to the chill configuration space (6) and is in communication with it.
8. The core with the chill assembly as claimed in claim 5, characterized in that, The exhaust passage can be arranged as a number of non - communicating ones, and the number of the exhaust passages can be the same as the number of the chills (1) with a hollow structure.
9. The core with the chill assembly as claimed in claim 5, characterized in that, The exhaust passage can also be provided with a number of branches. One end of the main trunk of the exhaust passage leads to the chill configuration space (6), and the other end of the exhaust passage is provided with a number of branches. The end of each branch leads to the surface of the sand core body (4).
10. The sand core equipped with the chilling assembly according to claim 5, characterized in that, The distance from the intake passage to the surface of the sand core body (4) for forming the casting cavity is less than the distance from the exhaust passage to the surface of the sand core body (4) for forming the casting cavity.