Aluminum alloy gravity casting riser cooling mechanism

Abstract

The application discloses an aluminum alloy gravity casting riser cooling mechanism for cooling a riser in a casting mold, wherein the casting mold comprises a fixed mold and a movable mold which are matched to form a riser at the top, and the riser cooling mechanism comprises a support frame, a linear telescopic element and a riser cooling cover, wherein the support frame is fixedly arranged on the fixed mold and protrudes upwards by a predetermined height of the fixed mold, the linear telescopic element is fixedly installed at the top of the support frame and extends in the vertical direction, and the riser cooling cover is fixedly connected to the telescopic end of the linear telescopic element and faces the riser upwards, the bottom of the riser cooling cover is provided with an air outlet, and the riser cooling cover is connected with a cold air pipe for feeding cold air into the riser cooling cover. The aluminum alloy gravity casting riser cooling mechanism can assist in cooling the riser, reduce the solidification time of the riser itself and improve the working efficiency.

Description

Technical Field

[0001] This utility model relates to the field of casting equipment technology, and in particular to a riser cooling mechanism for gravity casting of aluminum alloys. Background Technology

[0002] In the gravity casting process of aluminum alloys, risers are usually set in the thick parts of the casting to feed the casting. The solidification time of the riser must be longer than the solidification time of the part of the casting that is being fed. That is, the solidification time of the riser is divided into two parts: one part is used for feeding the casting and the other part is used for the solidification of the riser itself.

[0003] If the riser is still solidifying after the casting feeding process is completed, opening the mold to remove the casting will not affect the casting itself, but the unsolidified riser will break open, causing the molten aluminum inside to flow out, severely impacting production. Generally, the mold must be opened and the casting removed only after the riser has completely solidified, but this inevitably affects work efficiency. Utility Model Content

[0004] This application provides a cooling mechanism for an aluminum alloy gravity casting riser, which can assist in cooling the riser, reduce the solidification time of the riser itself, thereby reducing the residence time of the casting and riser in the mold, and effectively improving work efficiency while ensuring product quality.

[0005] This application provides a riser cooling mechanism for gravity casting of aluminum alloy, used for cooling risers in a casting mold. The casting mold includes a fixed mold and a moving mold, which cooperate to form a riser at the top. The riser cooling mechanism includes a support frame, a linear telescopic element, and a riser cooling cover. The support frame is fixedly mounted on the fixed mold and protrudes upward from the fixed mold by a predetermined height. The linear telescopic element is fixedly mounted on the top of the support frame and extends vertically. The riser cooling cover is fixedly connected to the telescopic end of the linear telescopic element and faces the riser directly above it. The bottom of the riser cooling cover has an air outlet, and the riser cooling cover is connected to a cold air pipe for supplying cold air to the riser cooling cover to cool the riser through the air outlet.

[0006] In one possible implementation, the support frame is a U-shaped frame, including two vertical plates extending side by side in a vertical direction and a horizontal plate vertically connected to the top of the two vertical plates. The horizontal plate extends horizontally, and the linear telescopic element is fixedly installed on the top of the horizontal plate. The telescopic end of the linear telescopic element extends vertically downward through the horizontal plate.

[0007] In one possible implementation, the linear telescopic element is a hydraulic cylinder.

[0008] In one possible implementation, the riser cooling cover includes a connecting part and a cooling part. The cooling part is connected to the telescopic end of the linear telescopic element through the connecting part. The cooling part includes an annular shell. An air inlet is coaxially arranged inside the annular shell. The air inlet and the annular shell are connected by a connecting rod. The top of the air inlet is sealed to the cold air pipe. The air outlet is located at the bottom of the air inlet. An air outlet gap is formed between the air inlet and the annular shell.

[0009] In one possible implementation, the bottom of the air inlet duct is higher than the bottom of the annular housing.

[0010] In one possible implementation, the air outlets are multiple, and the multiple air outlets are evenly distributed at the bottom of the air inlet duct.

[0011] In one possible implementation, the annular housing is a circular housing, and the air inlet duct is a circular duct.

[0012] In one possible implementation, the linkage includes an upper linkage and a lower linkage. The upper linkage is arranged in a cross shape and located at the same height direction near the upper part of the annular housing, and the lower linkage is arranged in a cross shape and located at the same height direction near the lower part of the annular housing.

[0013] In one possible implementation, one end of the cold air duct is connected to the riser cooling cover via a first quick-connect coupling, and the opposite end of the cold air duct is equipped with a second quick-connect coupling.

[0014] Beneficial effects: Compared with the prior art, the aluminum alloy gravity casting riser cooling mechanism provided in this application sets up a riser cooling cover that can move up and down above the riser, so that the cold air pipe can cool the riser through the air outlet of the riser cooling cover, which can reduce the solidification time of the riser itself, thereby reducing the residence time of the casting and riser in the mold, thus effectively improving work efficiency.

[0015] These and other objects, features and advantages of this utility model will be fully realized through the following detailed description. Attached Figure Description

[0016] Figure 1 A schematic diagram of the aluminum alloy gravity casting riser cooling mechanism of this application is shown in use.

[0017] Figure 2 A partial structural schematic diagram of the aluminum alloy gravity casting riser cooling mechanism of this application is shown.

[0018] Figure 3 A bottom view of the riser cooling shroud in this application is shown.

[0019] Figure 4 A cross-sectional view of the riser cooling shroud in this application is shown. Detailed Implementation

[0020] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0021] Those skilled in the art should understand that, in the disclosure of this specification, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0022] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0023] refer to Figures 1 to 4 This application provides a riser cooling mechanism for gravity casting of aluminum alloy, used for cooling risers in casting molds, wherein the casting mold includes a fixed mold 10 and a moving mold 20, and the fixed mold 10 and the moving mold 20 cooperate to form a riser 30 on the top. The riser cooling mechanism includes a support frame 40, a linear telescopic element 50, and a riser cooling cover 60. The support frame 40 is fixedly mounted on the fixed mold 10 and protrudes upward from the fixed mold 10 by a predetermined height. The linear telescopic element 50 is fixedly mounted on the top of the support frame 40 and extends vertically. The riser cooling cover 60 is fixedly connected to the telescopic end 51 of the linear telescopic element 50 and faces the riser 30 directly above it. The bottom of the riser cooling cover 60 is provided with an air outlet 601. In addition, the riser cooling cover 60 is connected to a cold air pipe 70 for supplying cold air to the riser cooling cover 60. This cold air is applied to the riser 30 through the air outlet 601 to cool the riser 30, thereby reducing the solidification time of the riser 30 itself, reducing the residence time of the casting and the riser 30 in the mold, and improving work efficiency.

[0024] The linear telescopic element 50 is preferably a hydraulic cylinder.

[0025] Taking an A200 type product casting as an example, after the fixed mold 10 and the moving mold 20 are closed, molten aluminum is poured into the cavity after the mold is closed. The molten aluminum gradually solidifies. The solidification process is divided into 3 groups of experiments. Finally, the optimal test parameters are determined. The solidification time of the casting is calculated from the time of pouring end. There are 5 castings in each group. Group 1: 5 castings, without riser cooling mechanism, i.e. conventional casting, castings and riser 30 solidify in natural state, the total solidification time of each casting and riser 30 is 7 minutes, after the 7th minute, the mold is opened and the castings are taken out. Visual inspection shows that the surface of the castings and riser 30 is completely solidified, and the flaw detection castings have no shrinkage cavities. Group 2: 5 castings, using riser cooling mechanism. The riser cooling cover 60 descends to the position of riser 30 via the oil cylinder (stroke 300 mm). After the pouring is completed, the cold air pipe 70 is turned on in the second minute. The cold air volume is controlled by the program to increase from small (0) to large (0.2 cubic meters / second) within 30 seconds. The cold air is turned off in the fourth minute. At the same time, the riser cooling cover 60 rises. The mold is opened and the casting is taken out. The surface of the casting is solidified and complete. However, the surface of riser 30 is soft and there is a risk of it spreading. The flaw detection casting has no shrinkage cavities. Group 3: 5 castings, using riser cooling mechanism. The riser cooling cover 60 descends to the position of riser 30 via oil cylinder (stroke 300 mm). After pouring, the cold air is turned on in the 3rd minute. The cold air volume is controlled by the program to increase from small (0) to large (0.2 cubic meters / second) within 30 seconds. The cold air is turned off in the 5th minute. At the same time, the riser cooling cover 60 rises. The mold is opened and the casting is taken out. Visual inspection shows that the surface of the casting and riser 30 is solidified and complete. The flaw detection shows that there are no shrinkage cavities in the casting. Finally, it was decided to develop the process flow based on the parameters of the third group. The solidification time of a single casting and riser 30 is reduced from 7 minutes under natural conditions to 4 minutes with the aid of riser cooling mechanism, saving 3 minutes. Therefore, when using the riser cooling mechanism provided in this application, the casting output can be increased by at least one-third compared to the casting process without the riser cooling mechanism.

[0026] In one embodiment, the support frame 40 is a U-shaped frame, including two vertical plates 41 extending side by side in a vertical direction and a horizontal plate 42 vertically connected to the top of the two vertical plates 41. The horizontal plate 42 extends horizontally, and the linear telescopic element 50 is fixedly installed on the top of the horizontal plate 42. The telescopic end 51 of the linear telescopic element 50 extends vertically downward through the horizontal plate 42. Based on the function of the horizontal plate 42, it not only facilitates the installation of the linear telescopic element 50, but also ensures the stability of the vertical telescopic control of the linear telescopic element 50 during operation.

[0027] In one embodiment, the riser cooling shroud 60 includes a connecting portion 61 and a cooling portion 62. The cooling portion 62 is connected to the telescopic end 51 of the linear telescopic element 50 via the connecting portion 61. The cooling portion 62 includes an annular housing 621, and an air inlet duct 622 is coaxially disposed within the annular housing 621. The air inlet duct 622 and the annular housing 621 are connected by a connecting rod 623. The top of the air inlet duct 622 is sealed to the cold air duct 70, and the air outlet 601 is located at the bottom of the air inlet duct 622. An air outlet gap 602 is formed between the air inlet duct 622 and the annular housing 621. Cold air entering from the cold air duct 70 enters the air inlet duct 622 and is blown out through the air outlet 601 to cool the riser 30. This air can escape from the bottom side of the air inlet duct 622 or flow out through the air outlet gap 602. During this process, cold air can be continuously blown onto the riser 30 to cool it down.

[0028] In one embodiment, the bottom of the air inlet duct 622 is higher than the bottom of the annular shell 621. In this way, during the cooling process of the riser 30, the annular shell 621 can be directly pressed against the top of the casting mold. The cold air coming out of the air outlet 601 of the air inlet duct 622 cannot escape from the bottom of the annular shell 621 after acting on the riser 30, but flows out through the air outlet gap 602. This can prolong the contact time between the cold air and the riser 30, thereby improving the cooling efficiency.

[0029] In one embodiment, there are multiple air outlets 601, and the multiple air outlets 601 are evenly distributed at the bottom of the air inlet duct 622, which can play the role of uniform cold air force and make the riser 30 cool down evenly in all directions.

[0030] In one embodiment, the annular housing 621 is a circular housing, and the air inlet duct 622 is a circular cylinder, thereby making full use of the cooling space to specifically cool the circular riser 30. Obviously, for risers 30 of other shapes, the annular housing 621 and / or the air inlet duct 622 can also be designed to corresponding shapes, which will not be limited in detail here.

[0031] In one embodiment, the connecting rod 623 includes an upper connecting rod and a lower connecting rod, wherein the upper connecting rod is arranged in a cross shape and located at the same height direction near the upper part of the annular housing 621, and wherein the lower connecting rod is arranged in a cross shape and located at the same height direction near the lower part of the annular housing 621. This ensures the structural connection strength between the annular housing 621 and the air inlet duct 622, while not hindering the outflow of cold air.

[0032] In one embodiment, one end of the cold air duct 70 is connected to the riser cooling cover 60 via a first quick-connect coupling 71, facilitating quick connection and maintenance between the cold air duct 70 and the riser cooling cover 60. Meanwhile, the other end of the cold air duct 70 is equipped with a second quick-connect coupling 72, which is used to directly connect to a cold source or to connect to a cold source via a pipe, making it more convenient to use.

[0033] It should be noted that the terms "first" and "second" used in this application are for descriptive purposes only and do not indicate any order. They should not be construed as indicating or implying relative importance, and can be interpreted as names.

[0034] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A riser cooling mechanism for gravity casting of aluminum alloy, used for cooling risers in a casting mold, wherein the casting mold includes a fixed mold and a moving mold, the fixed mold and the moving mold cooperating to form a riser at the top, characterized in that, The riser cooling mechanism includes a support frame, a linear telescopic element, and a riser cooling cover. The support frame is fixedly mounted on the fixed mold and protrudes upward from the fixed mold by a predetermined height. The linear telescopic element is fixedly mounted on the top of the support frame and extends vertically. The riser cooling cover is fixedly connected to the telescopic end of the linear telescopic element and faces the riser directly above it. The bottom of the riser cooling cover is provided with an air outlet. The riser cooling cover is connected to a cold air pipe for supplying cold air to the riser cooling cover and cooling the riser through the air outlet.

2. The aluminum alloy gravity casting riser cooling mechanism as described in claim 1, characterized in that, The support frame is a U-shaped frame, including two vertical plates extending side by side in a vertical direction and a horizontal plate vertically connected to the top of the two vertical plates. The horizontal plate extends horizontally, and the linear telescopic element is fixedly installed on the top of the horizontal plate. The telescopic end of the linear telescopic element extends vertically downward through the horizontal plate.

3. The aluminum alloy gravity casting riser cooling mechanism as described in claim 2, characterized in that, The linear telescopic element is a hydraulic cylinder.

4. The aluminum alloy gravity casting riser cooling mechanism as described in claim 1, characterized in that, The riser cooling cover includes a connecting part and a cooling part. The cooling part is connected to the telescopic end of the linear telescopic element through the connecting part. The cooling part includes an annular shell. An air inlet is coaxially arranged inside the annular shell. The air inlet and the annular shell are connected by a connecting rod. The top of the air inlet is sealed to the cold air pipe. The air outlet is located at the bottom of the air inlet. An air outlet gap is formed between the air inlet and the annular shell.

5. The aluminum alloy gravity casting riser cooling mechanism as described in claim 4, characterized in that, The bottom of the air inlet duct is higher than the bottom of the annular housing.

6. The aluminum alloy gravity casting riser cooling mechanism as described in claim 4, characterized in that, The air outlet has multiple outlets, and the multiple air outlets are evenly distributed at the bottom of the air inlet.

7. The aluminum alloy gravity casting riser cooling mechanism as described in claim 4, characterized in that, The annular shell is a circular shell, and the air inlet duct is a circular duct.

8. The aluminum alloy gravity casting riser cooling mechanism as described in claim 4, characterized in that, The connecting rod includes an upper connecting rod and a lower connecting rod. The upper connecting rod is arranged in a cross shape and is located at the same height direction near the upper part of the annular shell. The lower connecting rod is arranged in a cross shape and is located at the same height direction near the lower part of the annular shell.

9. The aluminum alloy gravity casting riser cooling mechanism as described in claim 1, characterized in that, One end of the cold air duct is connected to the riser cooling cover via a first quick-connect coupling, and the other end of the cold air duct is equipped with a second quick-connect coupling.

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