Die casting mold with uniform cooling and method of using the same

Abstract

This invention relates to the field of metal casting technology, specifically to a die-casting mold with uniform cooling and its usage method. The mold includes an upper mold base and a lower mold base. An upper mold and a lower mold are respectively mounted on opposite surfaces of the upper and lower mold bases. The top surface of the lower mold has a forming cavity, and the bottom surface of the lower mold has an installation cavity. An ejector hole communicating with the installation cavity is formed on the inner bottom surface of the forming cavity. An ejector portion is movably mounted within the ejector hole, with its bottom end located within the installation cavity. A lifting assembly for pushing the ejector portion up and down is provided on the lower mold base. This application, by setting cooling channels around the lower mold and cooling flow channels within the ejector portion and the inner plug, can simultaneously address heat dissipation in both the mold body and the ejection area, thus improving the adhesion problem caused by localized heat accumulation in the ejection area.

Description

Technical Field

[0001] This invention relates to the field of metal casting technology, specifically to a die-casting mold with uniform cooling and its method of use. Background Technology

[0002] In the field of non-ferrous metal casting, die casting is one of the most common casting methods. It involves injecting high-temperature molten metal into a die-casting mold cavity, and then demolding the workpiece to obtain the final product. Existing die-casting molds typically consist of an upper mold and a lower mold. The lower mold has a cavity on its surface that matches the shape of the workpiece, and the cavity contains an ejector structure for ejecting the formed workpiece. To control the mold temperature, ensure casting quality, and improve production efficiency, the lower mold also has cooling channels that circulate cooling media to remove heat.

[0003] However, in actual die-casting production, the cooling channels are usually located inside the lower mold and do not extend through the ejector structure. Although the ejector structure is in close contact with the lower mold for heat conduction, its own high temperature leads to significant heat accumulation at the contact surface with the workpiece. This localized overheating not only exacerbates the adhesion between the workpiece and the ejector structure but also affects the workpiece's microstructure, resulting in increased demolding resistance, difficulty in demolding, and even workpiece deformation or tearing during demolding, severely restricting the production yield and mold life of die-cast products. Therefore, how to improve the cooling structure of existing die-casting molds, especially to achieve uniform and effective cooling of the ejector structure area to improve demolding performance, has become a pressing technical problem in this field. To this end, this invention proposes a die-casting mold with uniform cooling and its usage method. Summary of the Invention

[0004] The purpose of this invention is to provide a die-casting mold with uniform cooling and a method for using the same, in order to solve the problems mentioned in the background art.

[0005] The present invention is achieved through the following technical solution: a die-casting mold with uniform cooling, comprising an upper mold base and a lower mold base, wherein an upper mold and a lower mold are respectively provided on the facing surfaces of the upper mold base and the lower mold base, the top surface of the lower mold has a forming cavity, the bottom surface of the lower mold has an installation cavity, the inner bottom surface of the forming cavity has an ejection hole communicating with the installation cavity, an ejection part is movably provided in the ejection hole, the bottom end of the ejection part is located in the installation cavity, and the lower mold base is provided with a lifting assembly for pushing the ejection part up and down; The lower mold has water inlet and water outlet channels that communicate with the mounting cavity at both ends. The lower mold has a cooling channel inside and outside the molding cavity. The water inlet and water outlet of the cooling channel are located on the inner wall of the mounting cavity. The ejector part also has a cooling channel inside, with the water inlet and water outlet of the cooling channel located on the outer surface of the ejector part. A first three-way reversing valve is provided between the water inlet end of the water inlet channel, the water inlet end of the cooling channel, and the water inlet end of the cooling flow channel; The outlet ends of the water outlet channel, the cooling channel, and the cooling flow channel are all equipped with a second three-way reversing valve.

[0006] Optionally, both the first three-way reversing valve and the second three-way reversing valve are connected to both ends of the cooling flow channel via flexible hoses.

[0007] Optionally, the ejector portion is T-shaped, and the top of the ejector portion is disc-shaped.

[0008] Optionally, the lifting component is a cylinder, the cylinder body of which is fixedly connected to the lower mold base, and its movable end extends into the mounting cavity and is connected to the ejector part.

[0009] Optionally, the top surface of the ejector portion is provided with a hidden groove, and the inner bottom surface of the hidden groove is provided with a countersunk hole communicating with the bottom surface of the ejector portion. An inner plug is provided in both the hidden groove and the countersunk hole. A stepped groove is provided around the top edge of the inner plug in a circumferential direction, and the top contour of the hidden groove matches the stepped groove. A return spring is provided between the top lower surface of the inner plug and the bottom surface of the hidden groove. In its natural state, the return spring is in a compressed state, and the top surface of the inner plug is flush with the top surface of the ejection part.

[0010] Optionally, the bottom surface of the ejector portion is provided with a push sleeve for connecting with the lifting assembly, and the side wall of the push sleeve is provided with a through hole; the bottom end of the inner plug extends out below the ejector portion and is provided with a push frame, which passes through the through hole and extends out of the outside of the push sleeve.

[0011] Optionally, the cooling channel includes a first cooling channel opened in the top part and a second cooling channel opened in the inner plug. The top part is provided with a water inlet and a water outlet at both ends. The inner surface of the countersunk hole is provided with a water inlet groove and a water outlet groove on both sides. The water inlet groove and the water outlet groove are respectively connected to the water inlet and the water outlet. The two ends of the first cooling channel are located above the water inlet and the water outlet, respectively, and the two ends of the second cooling channel are connected to the water inlet tank and the water outlet tank, respectively.

[0012] Optionally, a connecting hole is provided below the water inlet and water outlet, respectively, which communicates with the water inlet tank and the water outlet tank. The two connecting holes are located directly below both ends of the first cooling channel. Both the inlet and outlet holes are provided with elastic sealing plates at their inner ends. Both sides of the outer surface of the inner plug are provided with sealing columns. The sealing columns pass through the elastic sealing plates and are sealed to them. When the top of the inner plug is flush with the top surface of the ejector, the top of the sealing column is embedded in both ends of the first cooling channel.

[0013] Optionally, the inner top surface of the mounting cavity and both sides of the ejector are provided with blocking rods, which are used to prevent the pusher from rising synchronously with the ejector; when the top surface of the ejector is flush with the inner bottom surface of the molding cavity, there is a gap between the blocking rod and the pusher.

[0014] This invention also proposes a method for using a die-casting mold with uniform cooling, comprising the following steps: The upper and lower molds are closed, and high-temperature molten metal is injected into the forming cavity; Open the first three-way reversing valve and the second three-way reversing valve to allow external cooling water to enter through the inlet channel and exit through the cooling channel and the outlet channel, so as to achieve rapid cooling of the high-temperature molten metal. The upper and lower molds separate, and the lifting assembly controls the ejector to lift the formed workpiece upwards. At the same time, the first three-way reversing valve and the second three-way reversing valve switch paths, allowing cooling water to enter through the inlet channel and exit through the cooling flow channel and the outlet channel, thereby cooling the contact surface between the ejector and the molded workpiece, so as to easily achieve demolding of the molded workpiece and the ejector.

[0015] Compared with the prior art, the present invention provides a die-casting mold with uniform cooling and a method for using the same, which has the following beneficial effects: 1. This application provides a cooling channel around the lower mold and a cooling flow channel in the ejector section and the inner plug, which can simultaneously take into account the heat dissipation of the mold body and the ejector area, and is beneficial to improving the sticking problem caused by local heat accumulation in the ejector area; 2. This application utilizes the cooperation of the inner plug, the sealing column, the first cooling channel, and the second cooling channel to allow the cooling medium to first enter the inner plug and then enter the ejection part, thereby achieving staged cooling. Allowing the cooling medium to first enter the inner plug that is about to be separated can quickly remove the heat from the inner plug even when the flow rate of the cooling medium is limited, thereby reducing the adhesion between the inner plug and the formed workpiece. 3. The present invention utilizes the inner plunger to descend first, which greatly reduces the force and contact area between the workpiece and the ejector, thereby making it easier for workers to remove the workpiece from the ejector and reducing the risk of workpiece deformation or damage to a certain extent. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the first state of the mold in this invention; Figure 3 This is a schematic diagram of the second state of the mold in this invention; Figure 4 This is a schematic diagram of the first state of the ejector portion of the present invention; Figure 5 This is a schematic diagram of the second state of the ejector portion of the present invention; Figure 6 This is a schematic diagram of the internal plug structure of the present invention; Figure 7 This is a cross-sectional view of the internal plug structure of the present invention; Figure 8 This is a cross-sectional view of the top-mounted part structure of the present invention; Figure 9 The top portion of the present invention has a cross-sectional view; Figure 10 for Figure 8 Enlarged view of point A in the middle.

[0017] In the diagram: 100, upper mold base; 101, upper mold; 200, lower mold base; 201, lower mold; 202, mounting cavity; 203, forming mold cavity; 204, ejector hole; 205, water inlet channel; 206, water outlet channel; 207, cooling channel; 300, ejector part; 301, hidden groove; 302, inner plug; 303, return spring; 304, push sleeve; 305, push frame; 306, first cooling channel; 307, second cooling channel; 308, water inlet hole; 309, water outlet hole; 310, elastic sealing sheet; 311, flow hole; 312, sealing column; 313, water inlet groove; 314, water outlet groove; 400, first three-way reversing valve; 500, second three-way annular valve; 600, lifting assembly; 700, blocking rod. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that during the demolding process of die-cast parts, even after the ejector structure has lifted the workpiece from the molding cavity, a certain degree of thermal adhesion often still exists between the workpiece and the ejector structure. This is because the die-cast part still has a relatively high temperature after molding, and the ejector structure, as a component that directly contacts the workpiece, is also prone to a high temperature state due to heat accumulation on its surface, thus increasing the adhesion between the two contact areas.

[0020] In this situation, if the workpiece is forcibly removed from the ejection structure by external force after ejection, the workpiece surface, especially the local area in contact with the ejection structure, is prone to tearing, scratching, or surface damage. This not only affects the surface quality of the workpiece but may also adversely affect the performance of subsequent products. To solve the above problems, the present invention proposes the following technical solution: Example 1: Please refer to Figure 1 - Figure 10 This application provides a die-casting mold with uniform cooling, including an upper mold base 100 and a lower mold base 200. The upper mold base 100 and the lower mold base 200 have an upper mold 101 and a lower mold 201 respectively facing each other. The top surface of the lower mold 201 has a forming cavity 203, and the bottom surface of the lower mold 201 has an installation cavity 202. The inner bottom surface of the forming cavity 203 has an ejection hole 204 communicating with the installation cavity 202. An ejector part 300 is movably disposed within the ejection hole 204, and the bottom end of the ejector part 300 is located within the installation cavity 202. The lower mold base 200 is provided with a lifting assembly 600 for pushing the ejector part 300 up and down. The ejector part 300 can move up and down relative to the lower mold 201 along the axial direction of the ejection hole 204 to eject the die-casting part from the forming cavity 203 after the die-casting part is formed.

[0021] The lower mold 201 has a water inlet channel 205 and a water outlet channel 206 that communicate with the mounting cavity 202 at both ends. A cooling channel 207 is located inside the lower mold 201 and around the molding cavity 203. The inlet and outlet ends of the cooling channel 207 are located on the inner wall of the mounting cavity 202. A cooling flow channel is also provided inside the ejector section 300, with its inlet and outlet ends located on the outer surface of the ejector section 300. Through this arrangement, the cooling medium can not only flow in the cooling channel 207 inside the lower mold 201 to provide basic cooling to the area surrounding the molding cavity 203, but also enter the cooling flow channel inside the ejector section 300 to directly cool the ejection area. This makes the cooling effect closer to the contact point between the die-cast part and the ejection structure, facilitating subsequent demolding operations.

[0022] Specifically, a first three-way directional valve 400 is provided between the inlet ends of the water inlet channel 205 and the cooling channel 207, and a second three-way directional valve 500 is provided between the outlet ends of the water outlet channel 206 and the cooling channel 207, and the cooling channel. Both the first three-way directional valve 400 and the second three-way directional valve 500 are connected to both ends of the cooling channel via flexible hoses. The hoses can accommodate the displacement changes of the ejector section 300 during its lifting and lowering process, thus ensuring that the ejector section 300 remains connected to the external water supply and return structure during its reciprocating motion. The first three-way directional valve 400 and the second three-way directional valve 500 can be used to introduce external cooling medium into the cooling channel 207 and the cooling channel, and to discharge the cooling medium through the outlet channel 206 after heat exchange, thus forming a circulating cooling path. Both directional valves are solenoid valves, specifically two-position three-way directional valves, which can switch the cooling channel 207 and the cooling channel alternately connected to the water inlet channel 205. Furthermore, the switching action is directly controlled by an external controller.

[0023] It is worth mentioning that during the die casting process, the cooling medium only enters the cooling channel 207 to cool the lower mold 201; after the workpiece is formed, the three-way reversing valve switches its state so that the cooling water only enters the ejector section 300 for cooling, thereby making it easier to separate the ejector section 300 from the formed workpiece.

[0024] As one embodiment and not a limitation, the ejector portion 300 is T-shaped, and its top is disc-shaped. The top of the ejector portion 300 is used to contact the die-cast part. The disc-shaped structure helps to increase the contact area with the die-cast part, making the force distribution during the ejection process more uniform. The lifting assembly 600 is a cylinder. The cylinder body is fixedly connected to the lower mold base 200, and its movable end extends into the mounting cavity 202 and is connected to the ejector portion 300. When the cylinder is actuated, it can drive the ejector portion 300 to move up and down along the ejection hole 204.

[0025] As one embodiment and not a limitation, the top surface of the ejector 300 is provided with a concealed groove 301. A countersunk hole communicating with the bottom surface of the ejector 300 is formed through the inner bottom surface of the concealed groove 301. An inner plug 302 is provided in both the concealed groove 301 and the countersunk hole. The outer surface of the inner plug 302 is tightly fitted to the inner walls of the concealed groove 301 and the countersunk hole to prevent molten metal from seeping into the gaps. A stepped groove is formed around the circumference of the top edge of the inner plug 302. The top contour of the concealed groove 301 matches the stepped groove to prevent the top surface of the inner plug 302 from exceeding the top surface of the ejector 300. A return spring 303 is provided between the lower top surface of the inner plug 302 and the bottom surface of the concealed groove 301. In its natural state, the return spring 303 is compressed, meaning it always exerts an upward thrust on the inner plug 302, and the top surface of the inner plug 302 is flush with the top surface of the ejector 300. Therefore, in an unrestricted state, the inner plug 302 can maintain an upward reset trend under the action of the return spring 303, and together with the ejector portion 300, form a relatively flat top support surface to avoid affecting the forming quality of the corresponding area at the bottom of the die-cast part due to unevenness at the top. It should be noted that the elastic force of the return spring 303 needs to be large enough to resist the pressure during the metal hydraulic casting process; in this embodiment, when the top surface of the inner plug 302 is flush with the top surface of the ejector portion 300, the elastic force of the return spring 303 is not less than 50N.

[0026] The bottom surface of the ejector portion 300 is provided with a push sleeve 304 for connection with the lifting assembly 600. The side wall of the push sleeve 304 has a through opening. The bottom end of the inner plug 302 extends out from below the ejector portion 300 and is provided with a push frame 305. The push frame 305 passes through the through opening and extends out from the outside of the push sleeve 304. The inner top surface of the mounting cavity 202 and both sides of the ejector portion 300 are provided with a blocking rod 700. The blocking rod 700 is used to prevent the push frame 305 from rising synchronously with the ejector portion 300. When the top surface of the ejector portion 300 is flush with the inner bottom surface of the molding cavity 203, there is a gap between the blocking rod 700 and the push frame 305. Therefore, in the initial stage of the ejector 300's rise, the pusher 305 can move upward together with the ejector 300. After the pusher 305 moves upward and contacts the stop bar 700, the pusher 305's continued rise is restricted. Under the continuous drive of the lifting assembly 600, the ejector 300 can continue to rise relative to the inner plug 302, thereby causing the inner plug 302 to move downward relative to the ejector 300, so that the inner plug 302 separates from the formed workpiece first.

[0027] The cooling channel is described in detail below. It includes a first cooling channel 306 located within the top portion 300 and a second cooling channel 307 located within the inner plug 302. The top portion 300 has an inlet hole 308 and an outlet hole 309 at its two ends. An inlet groove 313 and an outlet groove 314 are formed on both sides of the inner surface of the countersunk hole, respectively, communicating with the inlet hole 308 and the outlet hole 309. The two ends of the first cooling channel 306 are located above the inlet hole 308 and the outlet hole 309, respectively. The two ends of the second cooling channel 307 communicate with the inlet groove 313 and the outlet groove 314, respectively. Specifically, the two ends of the second cooling channel 307 are directly opposite the inlet groove 313 and the outlet groove 314, respectively. Below the water inlet 308 and water outlet 309, there are connecting holes 311 that communicate with the water inlet groove 313 and the water outlet groove 314, respectively. The two connecting holes 311 are located directly below both ends of the first cooling channel 306. The inner ends of both the water inlet 308 and water outlet 309 are provided with elastic sealing plates 310, which are also located within the corresponding water inlet groove 313 / water outlet groove 314. When cooling water enters the interior of the water inlet 308, it can directly enter the first cooling channel 306, or it can enter the second cooling channel 307 through the connecting holes 311 and the water inlet groove 313. To improve the sealing performance of the flow channel, in this embodiment, sealing rings are fitted on both the inner ring of the countersunk hole and on both the upper and lower sides of the water inlet groove 313 / water outlet groove 314. These sealing rings are tightly fitted to the outer surface of the inner plug 302 to improve the sealing effect.

[0028] Furthermore, both sides of the outer surface of the inner plug 302 are provided with sealing posts 312. The sealing posts 312 penetrate the elastic sealing sheet 310 and are sealed to it. When the top of the inner plug 302 is flush with the top surface of the ejector part 300, the top of the sealing posts 312 is embedded at both ends of the first cooling channel 306. At this time, the cooling water entering the water inlet 308 can only enter the second cooling channel through the flow hole 311, that is, it can only cool the inner plug 302. When the inner plug 302 moves down and the bottom end of the sealing posts 312 is embedded in the flow hole 311, the cooling water can only enter the first cooling channel 306, thus it can only cool the ejector part 300.

[0029] In this embodiment, when the mold is closed or the ejector 300 is in its initial position, the top surface of the ejector 300 is flush with the inner bottom surface of the molding cavity 203. There is a gap between the blocking rod 700 and the pusher 305. The inner plug 302 remains in an upward position under the action of the return spring 303, making the top surface of the inner plug 302 flush with the top surface of the ejector 300. At this time, cooling water enters through the inlet channel 205, passes through the cooling channel 207 and the outlet channel 206, and is then discharged. That is, the cooling water only cools the lower mold 201, accelerating workpiece molding.

[0030] Once the workpiece is formed (or after a preset time), the lifting assembly 600 actuates and pushes the ejector 300 upward to eject the formed workpiece. Simultaneously, the first three-way reversing valve 400 and the second three-way reversing valve 500 automatically switch, allowing cooling water to enter the inlet hole 308. At this time, the top of the sealing column 312 is embedded at both ends of the first cooling channel 306, sealing both ends of the first cooling channel 306 and restricting the communication between the first cooling channel 306 and the inlet hole 308 and outlet hole 309. The cooling medium introduced from the first three-way reversing valve 400 enters the inlet hole 308 through a hose, first entering the inlet tank 313, then flowing into the second cooling channel 307 inside the inner plug column 302, where it flows and exchanges heat. Afterward, it flows through the outlet tank 314, the outlet hole 309, and the hose to the second three-way reversing valve 500, and then is discharged through the outlet channel 206 or returned to the external circulation device. In other words, during this stage, the cooling medium preferentially enters the inner plug 302 to cool it.

[0031] As the ejector portion 300 continues to rise, when the pusher frame 305 moves upward and contacts the stop bar 700, the pusher frame 305 stops rising under the restriction of the stop bar 700, while the ejector portion 300 continues to move upward under the drive of the lifting assembly 600. Since the pusher frame 305 is fixedly connected to the inner plug 302, the inner plug 302 moves downward relative to the ejector portion 300 during the upward movement of the ejector portion 300. As the inner plug 302 moves downward, the top of the sealing column 312 gradually disengages from the sealing positions at both ends of the first cooling channel 306, gradually forming a conductive relationship between the water inlet 308, the first cooling channel 306, and the water outlet 309. At the same time, the bottom end of the sealing column 312 is embedded in the connecting hole 311 to block the second cooling channel 307. Finally, the lifting assembly 600 stops driving the ejector portion 300 to rise.

[0032] In this state, cooling water enters the first cooling channel 306 directly through the inlet 308. After flowing and exchanging heat within the first cooling channel 306, it flows out through the outlet 309 and enters the second three-way reversing valve 500 via a hose, finally being discharged through the outlet channel 206 or returned to the circulation system. Thus, during operation, the cooling medium forms a flow path that first enters the second cooling channel 307 inside the inner plug 302, and then enters the first cooling channel 306 inside the outlet 300 after the inner plug 302 moves downward relative to the outlet 300.

[0033] Example 2: This application also proposes a method for using a die-casting mold with uniform cooling, including the following steps: The upper mold 101 and the lower mold 201 are closed, and high-temperature molten metal is injected into the forming cavity 203; Open the first three-way reversing valve 400 and the second three-way reversing valve 500 to allow external cooling water to enter through the inlet channel 205 and exit through the cooling channel 207 and the outlet channel 206, so as to achieve rapid cooling of the high-temperature molten metal. At this time, the cooling water mainly cools the lower mold 201 to cool the workpiece as a whole and quickly cool and shape the workpiece.

[0034] The upper mold 101 and the lower mold 201 separate. The lifting component 600 controls the ejector part 300 to lift the formed workpiece upward. At this time, the workpiece separates from the mold cavity and only sticks to the ejector part 300. Simultaneously, the first three-way reversing valve 400 and the second three-way reversing valve 500 switch paths, allowing cooling water to enter through the inlet channel 205 and exit through the cooling flow channel and the outlet channel 206. This cools the contact surface between the ejector section 300 and the molded workpiece, facilitating demolding of the molded workpiece and the ejector section 300. Specifically, cooling water first enters the inner plug 302 to pre-cool it. As the ejector section 300 continues to rise, the inner plug 302 descends relative to the ejector section 300 and separates from the workpiece. This design reduces the adhesion area and adhesion force of the workpiece, making it easier for subsequent workers to remove it.

[0035] Furthermore, after the inner plunger 302 descends, cooling water re-enters the ejector section 300 to achieve individual cooling of the ejector section 300. This design prioritizes localized cooling even with limited cooling water flow / velocity, thereby improving the localized cooling effect and enhancing the convenience of subsequent demolding.

[0036] 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.

[0037] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A die casting mold with uniform cooling, comprising an upper die holder and a lower die holder, the upper die holder and the lower die holder are respectively provided with an upper die and a lower die on their facing surfaces, the top surface of the lower die has a forming cavity, characterized in that: The bottom surface of the lower mold is provided with an installation cavity, and the inner bottom surface of the forming mold cavity is provided with an ejection hole communicating with the installation cavity. An ejection part is movably provided in the ejection hole, and the bottom end of the ejection part is located in the installation cavity. The lower mold base is provided with a lifting component for pushing the ejection part to rise and fall. The lower mold has water inlet and water outlet channels that communicate with the mounting cavity at both ends. The lower mold has a cooling channel inside and outside the molding cavity. The water inlet and water outlet of the cooling channel are located on the inner wall of the mounting cavity. The ejector part also has a cooling channel inside, with the water inlet and water outlet of the cooling channel located on the outer surface of the ejector part. A first three-way reversing valve is provided between the water inlet end of the water inlet channel, the water inlet end of the cooling channel, and the water inlet end of the cooling flow channel; The outlet ends of the water outlet channel, the cooling channel, and the cooling flow channel are all equipped with a second three-way reversing valve.

2. A die casting mold with uniform cooling according to claim 1, characterized in that: Both the first three-way reversing valve and the second three-way reversing valve are connected to both ends of the cooling flow channel via flexible hoses.

3. A die-casting mold with uniform cooling according to claim 1, characterized in that: The ejector portion is T-shaped, and the top of the ejector portion is disc-shaped.

4. A die-casting mold with uniform cooling according to claim 1, characterized in that: The lifting assembly is a cylinder, the cylinder body of which is fixedly connected to the lower mold base, and its movable end extends into the mounting cavity and is connected to the ejector part.

5. A die-casting mold with uniform cooling according to claim 1, characterized in that: The top surface of the ejector part is provided with a hidden groove, and the inner bottom surface of the hidden groove is provided with a countersunk hole that communicates with the bottom surface of the ejector part. The hidden groove and the countersunk hole are provided with an inner plug. The top edge of the inner plug is provided with a stepped groove around the circumference, and the top contour of the hidden groove matches the stepped groove. A return spring is provided between the top lower surface of the inner plug and the bottom surface of the hidden groove. In its natural state, the return spring is in a compressed state, and the top surface of the inner plug is flush with the top surface of the ejection part.

6. A die-casting mold with uniform cooling according to claim 5, characterized in that: The bottom surface of the ejector portion is provided with a push sleeve for connecting with the lifting assembly, and the side wall of the push sleeve is provided with a through hole; the bottom end of the inner plug extends out from below the ejector portion and is provided with a push frame, which passes through the through hole and extends out from the outside of the push sleeve.

7. A die-casting mold with uniform cooling according to claim 6, characterized in that: The cooling channel includes a first cooling channel opened in the top part and a second cooling channel opened in the inner plug. The top part has a water inlet and a water outlet at both ends. The inner surface of the countersunk hole has a water inlet groove and a water outlet groove on both sides. The water inlet groove and the water outlet groove are respectively connected to the water inlet and the water outlet. The two ends of the first cooling channel are located above the water inlet and the water outlet, respectively, and the two ends of the second cooling channel are connected to the water inlet tank and the water outlet tank, respectively.

8. A die-casting mold with uniform cooling according to claim 7, characterized in that: Below the water inlet and water outlet, there are connecting holes that communicate with the water inlet tank and the water outlet tank, respectively. The two connecting holes are located directly below both ends of the first cooling channel. Both the inlet and outlet holes are provided with elastic sealing plates at their inner ends. Both sides of the outer surface of the inner plug are provided with sealing columns. The sealing columns pass through the elastic sealing plates and are sealed to them. When the top of the inner plug is flush with the top surface of the ejector, the top of the sealing column is embedded in both ends of the first cooling channel.

9. A die-casting mold with uniform cooling according to claim 8, characterized in that: The inner top surface of the mounting cavity and both sides of the ejector are provided with blocking rods. The blocking rods are used to prevent the pusher from rising synchronously with the ejector. When the top surface of the ejector is flush with the inner bottom surface of the molding cavity, there is a gap between the blocking rod and the pusher.

10. A method for using a die-casting mold with uniform cooling, characterized in that: Includes the following steps The upper and lower molds are closed, and high-temperature molten metal is injected into the forming cavity; Open the first three-way reversing valve and the second three-way reversing valve to allow external cooling water to enter through the inlet channel and exit through the cooling channel and the outlet channel, so as to achieve rapid cooling of the high-temperature molten metal. The upper and lower molds separate, and the lifting assembly controls the ejector to lift the formed workpiece upwards. At the same time, the first three-way reversing valve and the second three-way reversing valve switch paths, allowing cooling water to enter through the inlet channel and exit through the cooling flow channel and the outlet channel, thereby cooling the contact surface between the ejector and the molded workpiece, so as to easily achieve demolding of the molded workpiece and the ejector.

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