A squeeze casting punch cooling device

Abstract

The present invention discloses a squeeze casting punch cooling device, comprising an upper punch, a lower punch, a heat pipe and a push rod, wherein the upper punch and the lower punch are coaxially mounted, a water storage area is formed between the upper punch and the lower punch, the push rod is mounted at the lower part of the lower punch, the evaporation end of the heat pipe is mounted in the upper punch, and the condensation end of the heat pipe is located in the lower punch. The present invention utilizes the extremely strong heat dissipation performance of the heat pipe, and rapidly transfers the heat of the upper punch to the outside of the heat pipe through the heat pipe, and its thermal conductivity exceeds that of any known metal. At the same time, cooling water is introduced into the upper punch to accelerate the cooling of the upper punch, and a water outlet and a water inlet are arranged. By controlling the aperture size, cold water leakage is effectively avoided, cooling time is saved, heat dissipation is uniformly provided, and the punch temperature is effectively controlled, which greatly improves the stability of squeeze casting.

Description

Technical Field

[0001] The invention relates to the technical field of extrusion casting equipment, in particular to an extrusion casting punch cooling device. Background Art

[0002] Squeeze casting equipment is a key equipment to realize the squeeze casting process and ensure the quality of part forming. Among them, the injection mechanism is the core component of the squeeze casting equipment. It is an important device to push the molten metal into the mold cavity and maintain pressure to form. The injection mechanism directly affects the forming quality of the casting. It is mainly composed of a pressure chamber, a punch and a push rod. In the continuous production process, in order to ensure the quality of the product and the stability of the casting process, the gap between the pressure chamber and the punch must be controlled within a reasonable range. The key is to control the expansion of the punch component in the mechanism due to high temperature and high pressure, and the most effective way is to reduce the temperature of the punch. Since the punch works under high temperature and high pressure during the squeeze casting process and is in a closed and limited space, the human body cannot get close to the squeeze casting equipment. Therefore, improving the punch structure is the simplest and most direct method.

[0003] There are few existing methods for cooling the punch head components. The main method is to cool the punch head by passing water into the inside of the punch head. Although this method is simple to operate, it has the following obvious disadvantages and shortcomings:

[0004] 1. The temperature at the axis of the punch is low, while the temperature around it is high, which can easily cause uneven heating and cooling of the punch and reduce its service life;

[0005] Second, during the extrusion casting process, personnel are required to control the water flow process in real time, and there is only one water channel. After the water is passed, the water flow can only be stopped and the next water flow can be carried out after waiting for the cold water to completely flow out. This reduces efficiency and poses certain risks, and also has a certain impact on the stability of the injection process. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a device for controlling the temperature of an extrusion casting punch component which is safe, reliable, easy to use and maintain, and has effective temperature control, thereby ensuring the stability of the equipment.

[0007] The technical solution of the present invention is: an extrusion casting punch cooling device, including an upper punch, a lower punch, a heat pipe and a push rod, the upper punch and the lower punch are coaxially installed, a water storage area is formed between the upper punch and the lower punch, the push rod is installed at the lower part of the lower punch, the evaporation end of the heat pipe is installed in the upper punch, and the condensation end of the heat pipe is located in the lower punch. Among them, the heat pipe is a heat transfer element with excellent super thermal conductivity, which can conduct the heat of the punch, the lower punch can effectively support the upper punch, and the push rod can push the upper punch and the lower punch to move up and down.

[0008] The lower punch is provided with a water inlet hole and a water outlet hole connected to the water storage area. The water inlet hole is located at the upper center of the lower punch. On the end surface of the lower punch forming the water storage area, the water inlet hole to the water outlet hole is a downward slope. Among them, with this structure, the upper end surface of the lower punch is a structure with a high middle and low surroundings, and the water outlet holes are distributed around the water inlet hole, which is conducive to the cooling water flowing downward to the water outlet hole, and facilitates the circulation of cooling water.

[0009] The upper punch is provided with a cylindrical deep hole for installing the evaporation end of the heat pipe, and the evaporation end of the heat pipe is transitionally matched with the deep hole. The bottom of the lower punch is provided with a groove for fixing the condensation end of the heat pipe. The evaporation end of the heat pipe contacts the upper punch, and the condensation end of the heat pipe contacts the groove. The groove is close to the hole wall of the water outlet hole, so that the energy of the heat pipe is easily transmitted to the water outlet hole, which can effectively dissipate heat.

[0010] The outer side wall of the lower punch is axially sealed with the inner side wall of the upper punch. This structure can effectively prevent water leakage.

[0011] A threaded hole is arranged at the center of the lower part of the lower punch, and an outer wall of the push rod is provided with an external thread matched with the threaded hole, and the lower punch is sealedly connected with the push rod thread. This structure can effectively prevent water leakage.

[0012] The center of the push rod is provided with a through hole connected to the water inlet hole, and the push rod is also provided with a downward inclined groove, which corresponds to the position of the water outlet hole. The external cooling water flows to the water inlet hole through the through hole, and then enters the water storage cavity. The cooling water that absorbs heat flows out of the water outlet hole and flows to the inclined groove. The inclined groove is conducive to the slow outflow of cooling water.

[0013] The ends of the evaporation end and the condensation end of the heat pipe are both conical. The evaporation end absorbs the heat from the upper punch and conducts it to the condensation end. The distance between the groove wall of the groove fixing the condensation end and the hole wall of the water outlet hole is at most 3 mm, so that the cooling water from the water outlet hole can take away the heat from the condensation end of the heat pipe and improve the heat dissipation effect.

[0014] The distance between the axis of the deep hole and the axis of the upper punch is 5 / 7 to 4 / 5 of the radius of the end face of the upper punch, and the radius of the deep hole is 1 / 14 to 1 / 8 of the radius of the end face of the upper punch.

[0015] The radius of the water inlet hole is 1 / 6 to 1 / 4 of the radius of the upper end surface of the lower punch, and the radius of the water outlet hole is 1 / 9 to 1 / 8 of the radius of the upper end surface of the lower punch.

[0016] The diameter of the through hole of the push rod is not less than the diameter of the water inlet hole, and the diameter of the inclined groove is not less than the diameter of the water outlet hole. This structure can effectively prevent cooling water leakage.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention uses the heat pipe as a direct heat transfer medium, greatly improving the heat dissipation efficiency and better controlling the working temperature of the punch; while using the heat pipe to dissipate heat, cooling water is also introduced to cool the temperature of the punch, greatly reducing the temperature of the punch.

[0019] The present invention reasonably arranges the position of the heat pipe, arranges the evaporation end of the heat pipe on the upper punch, and arranges the condensation end of the heat pipe on the lower punch, adjacent to the water outlet hole, which can ensure that the punch dissipates heat evenly; the center position of the lower punch is the water inlet hole, and the surroundings of the lower punch are water outlet holes, which ensures that the lower punch dissipates heat evenly, and the water inlet hole and the water outlet hole can continuously pass water, thereby improving the heat dissipation efficiency.

[0020] The punch cooling device of the present invention has a reasonable structure and is easy to install and disassemble. It can effectively control water flow impact and cold water leakage by controlling the aperture size and setting the inclined surface, so that the whole process can be carried out smoothly. The whole process does not require manual operation and proximity to the equipment, personal safety is effectively guaranteed, and labor costs are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the extrusion casting punch cooling device.

[0022] Figure 2 This is a cross-sectional view of the upper punch.

[0023] Figure 3 This is a cross-sectional view of the lower punch.

[0024] Figure 4 A cross-sectional view of a push rod.

[0025] Figure 5 A cross-sectional view of a heat pipe.

[0026] As shown in the figure, 1 is an upper punch, 2 is a lower punch, 3 is a heat pipe, 4 is a push rod, 5 is a deep hole, 6 is a water storage area, 7 is a water inlet hole, 8 is a water outlet hole, 9 is a groove, 10 is a through hole, 11 is the evaporation end of the heat pipe, 12 is the condensation end of the heat pipe, 13 is an inclined surface, and 14 is an inclined groove. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0028] Example

[0029] This embodiment is a squeeze casting punch cooling device, such as Figure 1As shown, it includes an upper punch 1, a lower punch 2, a heat pipe 3 and a push rod 4. The upper punch and the lower punch are coaxially installed, and a water storage area 6 is formed between the upper punch and the lower punch. The push rod is installed at the lower part of the lower punch. The evaporation end of the heat pipe is installed in the upper punch, and the condensation end of the heat pipe is located in the lower punch. The heat pipe is a heat transfer element with excellent super thermal conductivity, which can extract the heat of the punch. The evaporation end of the heat pipe absorbs the heat of the upper punch and conducts it to the lower punch to dissipate the heat. The lower punch can effectively support the upper punch, and the push rod can push the upper punch and the lower punch to move up and down. In order to ensure the sealing and avoid water leakage, the outer wall of the lower punch is axially sealed with the inner wall of the upper punch, a threaded hole is provided at the lower center of the lower punch, and an external thread matching the threaded hole is provided on the outer wall of the push rod, and the lower punch is threadedly sealed with the push rod.

[0030] like Figure 2 and Figure 3 As shown, the upper punch is provided with a cylindrical deep hole 5 for installing the evaporation end of the heat pipe, the evaporation end of the heat pipe is transitionally matched with the deep hole, and the bottom of the lower punch is provided with a groove 9 for fixing the condensation end of the heat pipe, the positions of the deep hole and the groove correspond, and after the upper punch and the lower punch are installed, the deep hole and the groove are tightly matched. Among them, the evaporation end of the heat pipe contacts the upper punch, and the condensation end of the heat pipe contacts the groove, and the groove is close to the hole wall of the water outlet, which facilitates the energy of the heat pipe to be transmitted to the water outlet, and can improve the heat dissipation efficiency.

[0031] like Figure 3 As shown, the lower punch is provided with a water inlet hole 7 and a water outlet hole 8 connected with the water storage area. The water inlet hole is located at the upper center of the lower punch. On the end face of the lower punch forming the water storage area, there is a downward slope 13 from the water inlet hole to the water outlet hole. The upper end face of the lower punch is a structure with a high middle and low surroundings. The water outlet holes are distributed around the water inlet hole, which is beneficial for the cooling water to flow downward to the water outlet hole and facilitates the circulation of the cooling water.

[0032] like Figure 4 As shown, a through hole 10 connected to the water inlet hole is provided at the center of the push rod, and a downward inclined groove 14 is also provided on the push rod. The inclined groove corresponds to the position of the water outlet hole. External cooling water flows to the water inlet hole through the through hole and then enters the water storage chamber. The cooling water that absorbs heat flows out from the water outlet hole and flows to the inclined groove. The inclined groove is conducive to the slow outflow of cooling water.

[0033] like Figure 5 As shown, the ends of the evaporation end 11 and the condensation end 12 of the heat pipe are both conical. The evaporation end absorbs the heat from the upper punch and conducts it to the condensation end. The groove that fixes the condensation end is close to the water outlet for heat dissipation, which facilitates the heat of the condensation end of the heat pipe to be taken away through the water outlet.

[0034] The distance between the axis of the deep hole and the axis of the upper punch is 4 / 5 of the radius of the upper punch end face, and the radius of the deep hole is 1 / 8 of the radius of the upper punch end face. The radius of the water inlet hole is 1 / 6 of the radius of the upper end face of the lower punch, and the radius of the water outlet hole is 1 / 9 of the radius of the upper end face of the lower punch. The aperture of the through hole of the push rod is not less than the aperture of the water inlet hole, and the diameter of the inclined groove is not less than the aperture of the water outlet hole. The above structure can effectively prevent the cooling water from leaking during the flow process.

[0035] The present invention utilizes the extremely strong heat dissipation performance of the heat pipe to quickly transfer the heat of the upper punch to the outside of the heat pipe through the heat pipe. The heat conductivity of the heat pipe exceeds that of any known metal. At the same time, cooling water is introduced into the upper punch to accelerate the cooling of the upper punch. The water outlet and the water inlet are arranged to effectively avoid cold water leakage by controlling the aperture size, save cooling time, help to evenly dissipate heat, effectively control the punch temperature, and greatly improve the stability of extrusion casting.

[0036] As described above, the present invention can be better implemented. The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention; that is, all equivalent changes and modifications made according to the content of the present invention are covered by the scope of protection required by the claims of the present invention.

Claims

1. A squeeze casting punch cooling device, characterized in that: It includes an upper punch, a lower punch, a heat pipe and a push rod. The upper punch and the lower punch are coaxially installed. A water storage area is formed between the upper punch and the lower punch. The push rod is installed at the lower part of the lower punch. The evaporation end of the heat pipe is installed in the upper punch, and the condensation end of the heat pipe is located in the lower punch. The lower punch is provided with a water inlet hole and a water outlet hole connected with the water storage area. The upper punch is provided with a cylindrical deep hole for installing the evaporation end of the heat pipe, the evaporation end of the heat pipe is transitionally matched with the deep hole, and the bottom of the lower punch is provided with a groove for fixing the condensation end of the heat pipe; The distance between the groove wall of the groove for fixing the condensation end and the hole wall of the water outlet hole is at most 3 mm; The water inlet hole is located at the upper center of the lower punch, and on the end surface of the lower punch forming the water storage area, the water inlet hole to the water outlet hole is a downward slope; The distance between the axis of the deep hole and the axis of the upper punch is 5 / 7 to 4 / 5 of the radius of the end face of the upper punch, and the radius of the deep hole is 1 / 14 to 1 / 8 of the radius of the end face of the upper punch; The radius of the water inlet hole is 1 / 6 to 1 / 4 of the radius of the upper end surface of the lower punch, and the radius of the water outlet hole is 1 / 9 to 1 / 8 of the radius of the upper end surface of the lower punch.

2. The squeeze casting punch cooling device according to claim 1, characterized in that: The outer side wall of the lower punch is axially sealed and connected to the inner side wall of the upper punch.

3. The squeeze casting punch cooling device according to claim 1, characterized in that: A threaded hole is arranged at the center of the lower part of the lower punch, and an external thread matched with the threaded hole is arranged on the outer wall of the push rod. The lower punch is sealedly connected with the push rod thread.

4. The squeeze casting punch cooling device according to claim 1, characterized in that: A through hole communicating with the water inlet hole is arranged at the center of the push rod, and a downwardly inclined groove is also arranged on the push rod, and the position of the inclined groove corresponds to the water outlet hole.

5. The squeeze casting punch cooling device according to claim 1, characterized in that: The ends of the evaporation end of the heat pipe and the condensation end of the heat pipe are both conical, and the evaporation end absorbs the heat of the upper punch and conducts it to the condensation end.

6. The squeeze casting punch cooling device according to claim 4, characterized in that: The aperture of the through hole of the push rod is not less than the aperture of the water inlet hole, and the diameter of the inclined groove is not less than the aperture of the water outlet hole.

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