A rapid cooling structure for low-pressure casting molds

Abstract

This utility model discloses a rapid cooling structure for a low-pressure casting mold, including an upper mold, a lower mold, and a heat sink. The upper and lower molds form a cavity after being closed. A gate is provided in the middle of the lower mold. The heat sink is a ring-shaped structure that surrounds the outer periphery of the upper and lower molds. Its inner wall contour matches the shape of the outer wall of the upper and lower molds after they are closed. One end of the heat sink is fixedly connected to the outer edge of the lower mold, and the other end is in contact with the outer wall of the upper mold when the mold is closed. The heat sink is provided with a heat exchange structure. This utility model achieves efficient heat conduction by setting a heat exchange structure on the heat sink surrounding the outer periphery of the mold and utilizing the close contact between the heat sink and the mold. The heat is continuously removed through the heat exchange structure, ensuring rapid cooling of the mold, shortening the molding cycle, and improving production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of low-pressure casting technology, specifically a rapid cooling structure for low-pressure casting molds. Background Technology

[0002] Low-pressure casting refers to a casting method in which the mold is typically placed above a sealed crucible, and compressed air is introduced into the crucible to create a low pressure (0.06–0.15 MPa) on the surface of the molten metal. This causes the molten metal to rise through riser pipes to fill the mold and control solidification. This casting method provides good feeding, produces dense castings, and is suitable for casting large, thin-walled, and complex parts. It eliminates the need for risers, achieves a metal yield of up to 95%, is pollution-free, and is easily automated. However, it has higher equipment costs and lower production efficiency, and is generally used for casting non-ferrous alloys.

[0003] However, current low-pressure casting molds generally use natural cooling, which is slow, resulting in long production cycles, low efficiency, and inability to meet production needs. Utility Model Content

[0004] The purpose of this invention is to provide a rapid cooling structure for low-pressure casting molds to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A rapid cooling structure for a low-pressure casting mold includes an upper mold, a lower mold, and a heat sink. The upper and lower molds form a cavity after being closed. A gate is provided in the middle of the lower mold. The heat sink is an annular structure that surrounds the outer periphery of the upper and lower molds. Its inner wall contour matches the shape of the outer wall of the upper and lower molds after they are closed. One end of the heat sink is fixedly connected to the outer edge of the lower mold, and the other end is in contact with the outer wall of the upper mold when the mold is closed. The heat sink is provided with a heat exchange structure.

[0007] Furthermore, the heat exchange structure includes an opening on the heat sink, with a liquid inlet on one side and a liquid outlet on the other side. The heat sink has a liquid-cooled flow channel with its two ends connected to the liquid inlet and the liquid outlet, respectively. The liquid inlet is connected to a liquid inlet pipe, the other end of which is used to connect to the liquid delivery end of an external refrigeration liquid delivery device. The liquid outlet is connected to a liquid outlet pipe, the other end of which is used to connect to the liquid return end of an external refrigeration liquid delivery device.

[0008] Furthermore, positioning components are provided at the four corners of the top of the heat sink, and positioning holes for inserting the positioning components are provided at the top of the upper mold.

[0009] Furthermore, each of the four positioning components includes a pressure sensor fixedly mounted on the top of the heat sink. The pressure sensor is electrically connected to an external control system. The sensing end of the pressure sensor is facing upward, and a sleeve is fixedly connected to its top. A movable plate is slidably connected in the inner cavity of the sleeve. A compression spring is provided between the bottom of the movable plate and the bottom of the inner cavity of the sleeve. A positioning pin extending upward is provided on the top of the movable plate. The positioning pin can be inserted into the positioning hole on the top of the upper mold before mold closing.

[0010] Furthermore, the sleeve includes an upper sleeve and a lower sleeve connected by threads. The top of the upper sleeve is provided with a limiting part extending towards the center, and the inner wall of the limiting part contacts the outer wall of the positioning pin.

[0011] Furthermore, the pressure sensor is provided with an annular baffle on its outer periphery. The annular baffle is fixedly installed on the top of the heat sink and surrounds the outer edge of the pressure sensor, with its inner wall in contact with the outer wall of the pressure sensor.

[0012] Furthermore, the top of the annular baffle is threadedly connected to an annular limiting plate, and the top of the annular limiting plate is provided with a limiting part two extending towards the center, the inner wall of the limiting part two contacting the outer wall of the sleeve.

[0013] The beneficial effects of this utility model are:

[0014] This invention utilizes a ring-shaped heat sink, which surrounds the outer periphery of the upper and lower molds. The inner wall contour of the heat sink matches the shape of the outer wall of the mold after they are closed, ensuring a tight fit with the mold surface. One end of the heat sink is fixedly connected to the outer edge of the lower mold, while the other end fits against the outer wall of the upper mold when the mold is closed. During the process of molten metal injection and solidification, the mold absorbs a large amount of heat. The heat sink, through direct contact with the outer wall of the mold, rapidly absorbs and conducts this heat, accelerating the heat dissipation of the mold and promoting rapid cooling and solidification of the molten metal. This shortens the casting cycle and improves production efficiency.

[0015] This invention features a heat exchange structure on the heat sink, which operates continuously during the casting process. This structure effectively removes the heat absorbed by the heat sink, maintaining its excellent thermal conductivity and ensuring a cooling effect.

[0016] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] Figure 1 : Overall structural diagram of this utility model.

[0018] Figure 2 : A bottom view of this utility model.

[0019] Figure 3 : Cross-sectional view of the heat sink component of this utility model.

[0020] Figure 4 : Cross-sectional view of the positioning component of this utility model.

[0021] Figure 5 : Exploded view of the lens flat box mold of this utility model.

[0022] Figure 6 : Exploded view of the analyzer flat box shell mold of this utility model.

[0023] Figure 7 : Exploded view of the target cavity mold of this utility model.

[0024] Reference numerals: 1. Upper mold; 2. Lower mold; 3. Cavity; 4. Sand core; 5. Heat sink; 6. Heat exchange structure; 7. Positioning assembly; 11. Positioning hole; 21. Gate; 61. Opening; 62. Liquid cooling channel; 63. Liquid inlet; 64. Liquid outlet; 65. Liquid inlet pipe; 66. Liquid outlet pipe; 67. External cooling liquid delivery device; 71. Pressure sensor; 72. Sleeve; 73. Movable plate; 74. Compression spring; 75. Positioning pin; 76. Annular baffle; 77. Annular limiting plate; 721. Upper cylinder; 722. Lower cylinder; 723. Limiting part one; 771. Limiting part two. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0026] Please refer to Figure 1-7 ;

[0027] A rapid cooling structure for a low-pressure casting mold includes an upper mold 1, a lower mold 2, and a heat sink 5. After the upper mold 1 and lower mold 2 are closed, a cavity 3 is formed. A sand core 4 is provided within the cavity 3. Preferably, the sand core 4 can be of various types, and different sand cores 4 can be used to form lens flat boxes (such as…). Figure 5 As shown), analyzer flat housing (such as...) Figure 6 (as shown) or cavity on the target (such as Figure 7Different products are shown. A gate 21 is provided in the middle of the lower mold 2. Under pressure, molten metal is injected from below through the gate 21 into the cavity in the middle of the sand core 4, achieving low-pressure casting. The heat sink 5 is a ring-shaped structure, surrounding the outer periphery of the upper mold 1 and the lower mold 2. Its inner wall contour matches the shape of the outer wall of the upper mold 1 and the lower mold 2 after they are closed, ensuring a tight fit with the mold surface. One end of the heat sink 5 is fixedly connected to the outer edge of the lower mold 2, and the other end is in contact with the outer wall of the upper mold 1 when the mold is closed. Specifically, during the process of molten metal injection and solidification, the mold absorbs a large amount of heat. The heat sink 5, through direct contact with the outer wall of the mold, quickly absorbs and conducts heat, accelerating the heat dissipation rate of the mold, promoting rapid cooling and solidification of the molten metal, thereby shortening the casting cycle and improving production efficiency. Meanwhile, to prevent the heat sink 5 from overheating and reducing its thermal conductivity due to heat accumulation, a heat exchange structure 6 is provided on the heat sink 5. The heat exchange structure 6 operates continuously during the casting process, effectively removing the heat absorbed by the heat sink 5 to maintain its good thermal conductivity and ensure cooling effect. In addition, an ejector plate is provided above the upper mold 1, and several ejector pins are vertically installed at the lower end of the ejector plate. The ejector pins pass through the upper mold 1 and extend into the cavity on the corresponding side. After the casting has cooled and solidified, the ejector plate moves downwards in conjunction with the mold opening action, and the ejector pins push the finished casting out of the mold, achieving automated demolding.

[0028] In this embodiment, the heat exchange structure 6 includes an opening 61 on the heat sink 5. One side of the opening 61 has a liquid inlet 63, and the other side has a liquid outlet 64. The heat sink 5 contains a liquid-cooled flow channel 62 with its two ends connected to the liquid inlet 63 and the liquid outlet 64, respectively. The liquid inlet 63 is connected to an inlet pipe 65, the other end of which is connected to the delivery end of an external cooling liquid delivery device 67. The liquid outlet 64 is connected to an outlet pipe 66, the other end of which is connected to the return end of the external cooling liquid delivery device 67, thus forming a coolant circulation channel. During operation, the external cooling liquid delivery device 67 injects low-temperature coolant into the liquid-cooled flow channel 62 within the heat sink 5 through the inlet pipe 65 and the inlet 63. As the coolant flows through the flow channel, it absorbs heat conducted from the mold to the heat sink 5. Subsequently, the heated liquid is returned to the external cooling liquid delivery device 67 through the outlet 64 and the outlet pipe 66 for cooling, completing the circulation. The continuous flow of coolant effectively removes the heat generated by the mold during the casting process, preventing the heat sink 5 from reducing its thermal conductivity due to excessive temperature. This ensures that the mold and casting can be cooled down quickly, achieving efficient production.

[0029] In this embodiment, positioning components 7 are provided at the four corners of the top of the heat sink 5, and positioning holes 11 for inserting the positioning components 7 are provided at the top of the upper mold 1, so as to achieve precise alignment between the upper mold 1 and the heat sink 5. Specifically, each of the four positioning components 7 includes a pressure sensor 71 fixedly installed on the top of the heat sink 5. The pressure sensor 71 is electrically connected to an external control system and is used to monitor the force state during the mold closing process in real time. The sensing end of the pressure sensor 71 is set upwards, and a sleeve 72 is fixedly connected to its top. A movable plate 73 is slidably connected in the inner cavity of the sleeve 72. The movable plate 73 can slide up and down along the inner wall of the sleeve 72. A compression spring 74 is provided between the bottom of the movable plate 73 and the bottom of the inner cavity of the sleeve 72. The compression spring 74 provides an upward elastic support force for the movable plate 73. The top of the movable plate 73 is provided with an upwardly extending positioning pin 75. The positioning pin 75 can be inserted into the positioning hole 11 at the top of the upper mold 1 before the mold is closed. It should be noted that under the elastic force of the compression spring 74, the movable plate 73 is at the top position of the inner cavity of the sleeve 72, so that the top of the positioning pin 75 can be smoothly inserted into the positioning hole 11 of the upper mold 1 before the mold is closed, realizing the pre-positioning function.

[0030] The specific working process is as follows: Before mold closing, the normal working pressure threshold of pressure sensor 71 is set in the external control system. When the upper mold 1 and lower mold 2 are closed, if the four positioning holes 11 are perfectly aligned with the corresponding positioning pins 75, the positioning pins 75 will smoothly insert into the positioning holes 11 during the descent of the upper mold 1. During this process, although there is slight friction between the positioning pins 75 and the inner wall of the positioning holes 11, causing the positioning pins 75 and the movable plate 73 to sink slightly, the compression spring 74 will be slightly compressed. However, the pressure value generated is still within the preset normal range, and the control system judges it as a normal mold closing state and allows the mold closing action to continue. However, if one or more positioning holes 11 are misaligned with the corresponding positioning pins 75, the positioning pins 75 will be subjected to greater lateral or vertical pressure from the edge of the positioning holes 11 during the downward pressing of the upper mold 1, causing the movable plate 73 to be significantly pressed down, and the compression spring 74 to undergo greater deformation. This will cause the pressure value detected by the pressure sensor 71 to exceed the preset threshold. At this time, the external control system will immediately recognize the abnormal signal, automatically interrupt the mold closing action, stop the equipment operation, and trigger the alarm device to remind the operator to check the mold alignment in time to prevent damage to the mold, heat sink 5, or positioning structure due to misalignment.

[0031] In this embodiment, the sleeve 72 includes an upper sleeve 721 and a lower sleeve 722 connected by threads, which facilitates disassembly, maintenance, or replacement of internal components. The top of the upper sleeve 721 is provided with a limiting part 723 extending towards the center. The inner wall of the limiting part 723 contacts the outer wall of the positioning pin 75, which is used to radially limit and guide the positioning pin 75 to prevent it from deviating or shaking during up and down movement. At the same time, the limiting part 723 also serves to limit the movement and prevent the movable plate 73 from moving excessively upward under the elastic force of the compression spring 74 and dislodging from the sleeve 72.

[0032] In this embodiment, an annular baffle 76 is provided on the outer periphery of the pressure sensor 71. The annular baffle 76 is fixedly installed on the top of the heat sink 5. The annular baffle 76 surrounds the outer edge of the pressure sensor 71, and its inner wall contacts the outer wall of the pressure sensor 71. It is used to limit and protect the pressure sensor 71 in the circumferential direction, and ensure that the pressure sensor 71 remains coaxial and stable with the positioning hole 11 during installation and use.

[0033] In this embodiment, the top of the annular baffle 76 is threadedly connected to an annular limiting plate 77. The top of the annular limiting plate 77 is provided with a limiting part 771 extending towards the center. The inner wall of the limiting part 771 contacts the outer wall of the sleeve 72, thereby radially limiting the sleeve 72 and ensuring the stability of the sleeve 72 during operation. At the same time, the threaded connection between the annular baffle 76 and the annular limiting plate 77 facilitates the maintenance, calibration or replacement of the pressure sensor 71 in the future.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. A rapid cooling structure for a low-pressure casting mold, comprising an upper mold (1), a lower mold (2), and a heat dissipation component (5), wherein the upper mold (1) and the lower mold (2) form a cavity (3) after being closed, and a gate (21) is provided in the middle of the lower mold (2), characterized in that, The heat dissipation component (5) is a ring structure, which is arranged around the outer periphery of the upper mold (1) and the lower mold (2). Its inner wall contour matches the outer wall shape of the upper mold (1) and the lower mold (2) after they are closed. One end of the heat dissipation component (5) is fixedly connected to the outer edge of the lower mold (2), and the other end is in contact with the outer wall of the upper mold (1) in the closed state. The heat dissipation component (5) is provided with a heat exchange structure (6).

2. The rapid cooling structure for a low-pressure casting mold according to claim 1, characterized in that, The heat exchange structure (6) includes an opening (61) provided on the heat sink (5). One side of the opening (61) is provided with a liquid inlet (63) and the other side is provided with a liquid outlet (64). The heat sink (5) is provided with a liquid cooling channel (62) with its two ends connected to the liquid inlet (63) and the liquid outlet (64) respectively. The liquid inlet (63) is connected to a liquid inlet pipe (65). The other end of the liquid inlet pipe (65) is used to connect to the liquid delivery end of an external refrigeration liquid delivery device (67). The liquid outlet (64) is connected to a liquid outlet pipe (66). The other end of the liquid outlet pipe (66) is used to connect to the liquid return end of an external refrigeration liquid delivery device (67).

3. The rapid cooling structure for a low-pressure casting mold according to claim 1, characterized in that, The heat sink (5) has positioning components (7) at the four corners of its top, and the upper mold (1) has positioning holes (11) for the positioning components (7) to be inserted into its top.

4. The rapid cooling structure for a low-pressure casting mold according to claim 3, characterized in that, Each of the four positioning components (7) includes a pressure sensor (71) fixedly installed on the top of the heat sink (5). The pressure sensor (71) is electrically connected to an external control system. The sensing end of the pressure sensor (71) is set upwards, and a sleeve (72) is fixedly connected to its top. A movable plate (73) is slidably connected in the inner cavity of the sleeve (72). A compression spring (74) is provided between the bottom of the movable plate (73) and the bottom of the inner cavity of the sleeve (72). A positioning pin (75) extending upwards is provided on the top of the movable plate (73). The positioning pin (75) can be inserted into the positioning hole (11) on the top of the upper mold (1) before mold closing.

5. The rapid cooling structure for a low-pressure casting mold according to claim 4, characterized in that, The sleeve (72) includes an upper sleeve (721) and a lower sleeve (722) connected by threads. The top of the upper sleeve (721) is provided with a limiting part (723) extending towards the center. The inner wall of the limiting part (723) contacts the outer wall of the positioning pin (75).

6. The rapid cooling structure for a low-pressure casting mold according to claim 4, characterized in that, The pressure sensor (71) is provided with an annular baffle (76) on its outer periphery. The annular baffle (76) is fixedly installed on the top of the heat sink (5). The annular baffle (76) surrounds the outer edge of the pressure sensor (71), and its inner wall is in contact with the outer wall of the pressure sensor (71).

7. The rapid cooling structure for a low-pressure casting mold according to claim 6, characterized in that, The top of the annular baffle (76) is threadedly connected to an annular limiting plate (77), and the top of the annular limiting plate (77) is provided with a limiting part two (771) extending towards the center. The inner wall of the limiting part two (771) is in contact with the outer wall of the sleeve (72).

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