Injection mold with high-hardness wear-resistant coating and preparation method of injection mold

Abstract

The invention belongs to the technical field of injection molding, and discloses an injection mold with a high-hardness wear-resistant coating and a preparation method thereof.The injection mold comprises a static mold frame, a movable mold frame, a sprue, a mold cavity and a mold core, a first cooling cavity is formed in the static mold frame, and a cleaning assembly is rotationally arranged in the first cooling cavity; and a stirring assembly is fixedly arranged in the cleaning assembly. The rotary driving part drives the cleaning assembly and the stirring assembly to rotate in the first cooling cavity, friction cleaning is conducted on the heat exchange face, close to the side of the cavity, in the first cooling cavity in cooperation with the position arrangement of the cleaning assembly, and the stirring assembly in the cleaning assembly is driven to rotate; on one hand, the stirring effect in the first cooling cavity is provided under composite rotation, the uniform mixing effect of fed cooling water is improved, on the other hand, the rotation effect is used in cooperation with the cleaning assembly, local friction cleaning is achieved, water scale in a heat exchange area is removed, it is avoided that the water scale lowers the heat exchange efficiency, the cooling speed is comprehensively increased, and the forming and curing efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of injection molding technology, specifically an injection mold with a high-hardness wear-resistant coating and its preparation method. Background Art

[0002] Injection molds are precision tools used for the mass production of plastic products. Their core function is to mold molten plastic into parts of a specific shape through high-pressure injection.

[0003] In existing injection molds, hot molten material is fed into the mold cavity through a gate during use, and cooling is achieved in conjunction with a cooling chamber. However, during the actual cooling process, scale forms in the cooling chamber due to heat exchange and cooling water quality. This scale accumulates and increases the wall thickness, reducing subsequent heat exchange efficiency and thus the cooling rate. Consequently, the curing speed of the injection molding is reduced, affecting the injection molding efficiency. Furthermore, the fixed flow direction of the internal cooling water leads to uneven heat exchange, resulting in low heat exchange utilization of the cooling water and further reducing the efficiency of cooling and curing, resulting in poor performance. Summary of the Invention

[0004] The purpose of this invention is to provide an injection mold with a high-hardness, wear-resistant coating and its preparation method, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an injection mold with a high-hardness wear-resistant coating and its preparation method, comprising a stationary mold frame, a moving mold frame, a gate, a cavity, and a core. The stationary mold frame has a cooling chamber inside, and a cleaning assembly is rotatably mounted inside the cooling chamber. An agitator assembly is fixedly mounted inside the cleaning assembly. A mounting ring is fixedly connected to one side of the cleaning assembly, and an electromagnet is fixedly nested on the side of the mounting ring. A sleeve hole is formed inside the stationary mold frame, with both ends of the sleeve hole communicating with the cavity and the cooling chamber, respectively. An ejector pin assembly is located inside the sleeve hole. A rotation drive is located on the outer side of the stationary mold frame, and the rotation drive controls the rotation of the cleaning assembly. The ejector pin assembly includes an ejector pin, a retaining ring, and a second spring. The retaining ring is fixedly sleeved in the sleeve hole. One end of the second spring is fixedly connected to the retaining ring, and the other end is fixedly connected to the ejector pin. The ejector pin is made of magnetic material.

[0006] Preferably, the inner wall of the cavity and the outer surface of the core are provided with a high-hardness wear-resistant coating. The high-hardness wear-resistant coating includes a nitride coating, a carbon-based coating, a boride coating, a nano-reinforcing phase, and a hard ceramic phase. The cavity is opened on the front side of the stationary mold frame, the gate is opened inside the stationary mold frame and communicates with the cavity, and the core is fixed on the front side of the moving mold frame. The core and the cavity are adapted to each other.

[0007] Preferably, the cleaning assembly includes a cleaning plate and a cleaning frame, the cleaning frame being fixed to the end face of the cleaning plate, and the cleaning plate and cleaning frame being adapted to the inner side of the cooling chamber.

[0008] Preferably, the agitation assembly includes a fixed shaft, a sleeve, and an agitation plate. The fixed shaft is fixedly connected to the cleaning frame, the sleeve is fitted onto the outer surface of the fixed shaft, and the agitation plate is fixedly connected to the outer surface of the sleeve.

[0009] Preferably, the rotating drive component includes a power motor, a rotating ring, a first gear, and a second gear. The power motor is located on the outside of the stationary mold frame. The rotating ring is rotatably sleeved inside the first cooling chamber. The first gear is fixedly sleeved on the outer surface of the rotating ring. The second gear is fixedly sleeved on the output shaft of the power motor and located in the first cooling chamber, meshing with the first gear. The rotating ring is fixedly connected to the cleaning assembly.

[0010] Preferably, the static mold frame is provided with an opening and closing mechanism on the front side, the moving mold frame has an internal cooling chamber two, and the moving mold frame is fixedly provided with a conduction control part on the front side. When the conduction control part is sleeved with the opening and closing mechanism, the cooling chamber two is connected to the cooling chamber one.

[0011] Preferably, the opening and closing mechanism includes a central hole, a connecting port, a piston plate, and a spring. The central hole is located on the front of the stationary mold frame, and the connecting port is located inside the stationary mold frame. The two ends of the connecting port are respectively connected to the cooling chamber and the central hole. The piston plate is movably sleeved in the central hole. One end of the spring is fixedly connected to the piston plate, and the other end is fixed in the central hole.

[0012] Preferably, the second cooling chamber includes a cooling ring cavity, an inlet hole, and an outlet hole. The cooling ring cavity is located inside the moving mold frame. The inlet hole is located on the front side of the moving mold frame and communicates with the cooling ring cavity. The outlet hole is located at the bottom of the moving mold frame and communicates with the cooling ring cavity.

[0013] Preferably, the conduction control unit includes a conduction sleeve, a side opening, and a conduction hole. The conduction sleeve is fixedly connected to the front of the moving mold frame. The side opening is opened on the outer side of the conduction sleeve. The conduction hole is opened on the inner end of the conduction sleeve. The conduction hole communicates with the side opening and with the inlet hole.

[0014] A method for preparing an injection mold with a high-hardness, wear-resistant coating includes the following preparation steps: Step 1: Mold substrate pretreatment, selecting substrate and performing rough machining, heat treatment and fine machining on the substrate in sequence; Step 2: Coating preparation. The cavity and core of the above-mentioned precision mold substrate are cleaned. After cleaning, a coating is deposited using the PVD (Physical Vapor Deposition) method. Step 3: Perform post-coating treatment on the deposited surface, including polishing and passivation. Step 4: Conduct performance tests on the mold coating, including thickness testing, adhesion testing, hardness and wear resistance testing. After the tests are completed, the effective preparation is finished.

[0015] The beneficial effects of this invention are as follows: (1) The present invention utilizes a rotating drive to drive the cleaning component and the stirring component to rotate in the cooling chamber 1. With the position arrangement of the cleaning component, the heat exchange surface near the cavity side in the cooling chamber 1 is cleaned by friction. The cleaning component also drives the stirring component in the cleaning component to rotate. On the one hand, the combined rotation provides a stirring effect in the cooling chamber 1, improving the mixing effect of the supplied cooling water. On the other hand, the rotation action, in conjunction with the cleaning component, achieves local friction cleaning, removes scale in the heat exchange area, avoids scale from reducing heat exchange efficiency, and comprehensively improves the cooling speed and the efficiency of molding and curing.

[0016] (2) By utilizing the combined action of the opening and closing mechanism and the conduction control unit, the present invention achieves the conduction of cooling chamber one and cooling chamber two after the mold closing of the moving mold frame and the stationary mold frame, and completes the conduction of cooling water from the stationary mold frame to the interior of the moving mold frame. Combined with the shape of the core cover, it provides a larger heat exchange space for cooling chamber two, further improving the molding and solidification speed of the mold and improving production efficiency.

[0017] (3) This invention utilizes the rotation of the rotating drive component, in conjunction with the mounting ring installed on the cleaning component and the electromagnet nested on the mounting ring, and uses the ejector pin assembly elastically connected in the sleeve hole. The ejector pin is made of magnetic material. During the rotation of the mounting ring, the electromagnet generates magnetic attraction when energized, and the ejector pin cooperates with the same pole repulsion. The repulsive force pushes the ejector pin to move and impact the forming mold in the cavity, thereby assisting in unloading. In conjunction with the intermittent magnetic force push under rotation, the elastic reset of the spring one is used to form high-frequency vibration. The high-frequency impact of the ejector pin on the forming mold accelerates the unloading effect, avoids mold sticking, and improves the unloading effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional schematic diagram of the present invention; Figure 3 for Figure 2 Enlarged structural diagram at point A; Figure 4 for Figure 2 Enlarged structural diagram at point B; Figure 5 This is a cross-sectional schematic diagram of the static mold frame of the present invention; Figure 6 This is a cross-sectional schematic diagram of the moving mold frame of the present invention; Figure 7 This is a schematic diagram showing the connection between the rotation drive component and the cleaning assembly of the present invention; Figure 8 This is an exploded view of the electromagnet and mounting ring of the present invention; Figure 9 This is an exploded schematic diagram of the cleaning component and the agitation component of the present invention; Figure 10 This is a schematic diagram of the conduction control unit of the present invention; In the diagram: 1. Stationary mold frame; 2. Moving mold frame; 3. Gate; 4. Cavity; 5. Core; 6. Cooling chamber one; 7. Rotation drive component; 71. Power motor; 72. Rotating ring; 73. Gear one; 74. Gear two; 8. Cleaning assembly; 81. Cleaning plate; 82. Cleaning frame; 9. Agitating assembly; 91. Fixed shaft; 92. Sleeve; 93. Agitating plate; 10. Mounting ring; 11. Electromagnet; 12. Intermediate hole; 13. Connecting port; 14. Piston plate; 15. Spring one; 16. Conducting control part; 161. Conducting sleeve; 162. Side opening; 163. Conducting hole; 17. Ejector pin; 18. Fixed ring; 19. Spring two; 20. Sleeve hole; 21. Cooling chamber two; 211. Cooling ring cavity; 212. Inlet hole; 213. Outlet hole. Detailed Implementation

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] like Figures 1 to 10As shown, this embodiment of the invention provides an injection mold with a high-hardness wear-resistant coating and its preparation method, including a stationary mold frame 1, a moving mold frame 2, a gate 3, a cavity 4, and a core 5. A cooling chamber 6 is provided inside the stationary mold frame 1. A cleaning component 8 is rotatably provided inside the cooling chamber 6. An agitator 9 is fixedly provided inside the cleaning component 8. An installation ring 10 is fixedly connected to one side of the cleaning component 8. An electromagnet 11 is fixedly nested on the side of the installation ring 10. A sleeve hole 20 is provided inside the stationary mold frame 1. The two ends of the sleeve hole 20 are respectively connected to the cavity 4 and the cooling chamber 6. An ejector pin assembly is provided inside the sleeve hole 20. A rotation drive 7 is provided on the outside of the stationary mold frame 1. The rotation drive 7 controls the rotation of the cleaning component 8. The ejector pin assembly includes an ejector pin 17, a fixing ring 18, and a spring 19. The fixing ring 18 is fixedly sleeved in the sleeve hole 20. One end of the spring 19 is fixedly connected to the fixing ring 18, and the other end is fixedly connected to the ejector pin 17. The ejector pin 17 is made of magnetic material.

[0021] Example 1: In use, as the moving mold frame 2 moves and closes with the stationary mold frame 1, the control unit 16 is inserted into the middle hole 12 of the opening and closing mechanism during mold closing, squeezing the piston plate 14, compressing the spring 15, and opening the connecting port 13. The connecting port 13 is connected to the side port 162 in the control unit 16. An external injection device injects hot melt into the gate 3 and into the cavity 4, completely filling the cavity 4. An external cooling water supply mechanism supplies cooling water through the inlet at the bottom of the stationary mold frame 1 into the cooling chamber 6, and the water enters the cooling chamber 6. Cooling water is input into the connecting port 13 of the opening and closing mechanism, and enters into the side port 162. It then enters the cooling chamber 21 through the guide hole 163. The hot melt in the cavity 4 is rapidly cooled, and the rotating drive component 7 is activated. The power motor 71 drives the gear 2 74 to rotate, which in turn drives the meshing gear 1 73 to rotate, thereby driving the rotating ring 72 to rotate. This causes the connected cleaning component 8 and agitation component 9 to rotate. The cleaning component 8 rotates along the inner wall of the cooling chamber 6 near the cavity 4 to remove scale. The agitation component 9 agitates the cooling water, completing the self-cleaning and uniform cooling process.

[0022] First, the cleaning component 8 and the agitating component 9 are driven to rotate in the cooling chamber 6 by the rotating drive component 7. With the position arrangement of the cleaning component 8, the heat exchange surface near the cavity 4 in the cooling chamber 6 is cleaned by friction. At the same time, the agitating component 9 in the cleaning component 8 is rotated. On the one hand, the combined rotation provides a stirring effect in the cooling chamber 6, which improves the mixing effect of the supplied cooling water. On the other hand, the rotation action, together with the cleaning component 8, achieves local friction cleaning, removes scale in the heat exchange area, avoids scale from reducing heat exchange efficiency, and comprehensively improves the cooling speed and the efficiency of molding and curing.

[0023] Furthermore, by utilizing the combined action of the opening and closing mechanism and the conduction control unit 16, after the mold closing of the moving mold frame 2 and the stationary mold frame 1 is completed, the cooling chamber 1 6 and the cooling chamber 21 are connected, and the cooling water is connected from the stationary mold frame 1 to the interior of the moving mold frame 2. Combined with the shape of the core cover, the cooling chamber 21 is provided with a larger heat exchange space, which further improves the molding and solidification speed of the mold and increases production efficiency.

[0024] Example 2: After cooling is complete, stop the water supply, keep the rotating drive 7 rotating, and start the electromagnet 11 in the mounting ring 10. The electromagnet 11 generates magnetism when energized. When the electromagnet 11 rotates to the sleeve hole 20 of the ejector mechanism, the electromagnet 11 and the ejector pin 17 are aligned. Under the magnetic repulsion force, the ejector pin 17 moves quickly along the sleeve hole 20 and pushes the molding die in the cavity 4. As the electromagnet 11 rotates, the ejector pin 17 moves laterally repeatedly and vibrates the molding die, causing the molding die to quickly detach from the cavity 4.

[0025] First, by utilizing the rotation of the rotating drive 7 again, in conjunction with the mounting ring 10 installed on the cleaning assembly 8 and the electromagnet 11 nested in the mounting ring 10, the ejector pin assembly elastically connected in the sleeve hole 20, and the ejector pin 17 made of magnetic material, during the rotation of the mounting ring 10, the electromagnet 11, which generates magnetic attraction when energized, cooperates with the ejector pin 17 to achieve like pole repulsion. The repulsive force pushes the ejector pin 17 to move and impact the forming mold in the cavity 4, thereby assisting in material removal. In conjunction with the intermittent magnetic force push under rotation, the elastic reset of the spring 15 generates high-frequency vibration. The high-frequency impact of the ejector pin 17 on the forming mold accelerates the removal effect, avoids mold sticking, and improves the material removal effect.

[0026] The inner wall of the cavity 4 and the outer side of the core 5 are both provided with a high-hardness wear-resistant coating. The high-hardness wear-resistant coating includes nitride coating, carbon-based coating, boride coating, nano-reinforcing phase and hard ceramic phase. The cavity 4 is opened on the front side of the stationary mold frame 1, the gate 3 is opened inside the stationary mold frame 1 and communicates with the cavity 4, and the core 5 is fixed on the front side of the moving mold frame 2. The core 5 is adapted to the cavity 4.

[0027] A high-hardness, wear-resistant coating is formed by combining nitride coating, carbon-based coating, boride coating, nano-reinforcing phase, and hard ceramic phase to improve mold performance.

[0028] The cleaning assembly 8 includes a cleaning plate 81 and a cleaning frame 82. The cleaning frame 82 is fixed to the end face of the cleaning plate 81. The cleaning plate 81 and the cleaning frame 82 are adapted to the inner side of the cooling chamber 6. The agitation assembly 9 includes a fixed shaft 91, a sleeve 92 and an agitation plate 93. The fixed shaft 91 is fixedly connected in the cleaning frame 82. The sleeve 92 is sleeved on the outer surface of the fixed shaft 91. The agitation plate 93 is fixedly connected to the outer surface of the sleeve 92.

[0029] The cleaning component 8 and the stirring component 9 work together to achieve localized cleaning of the inner wall and remove scale during rotation, while also creating water flow and agitation to improve the dispersion of cooling water.

[0030] The rotating drive component 7 includes a power motor 71, a rotating ring 72, a first gear 73, and a second gear 74. The power motor 71 is located on the outside of the stationary mold frame 1. The rotating ring 72 is rotatably sleeved inside the cooling chamber 6. The first gear 73 is fixedly sleeved on the outer surface of the rotating ring 72. The second gear 74 is fixedly sleeved on the output shaft of the power motor 71 and is located in the cooling chamber 6 and meshes with the first gear 73. The rotating ring 72 is fixedly connected to the cleaning assembly 8.

[0031] The rotation drive 7 provides rotational power and controls the rotation of the cleaning assembly 8.

[0032] The stationary mold frame 1 has an opening and closing mechanism on its front side, and the moving mold frame 2 has an internal cooling chamber 21. The moving mold frame 2 has a fixed conductive control part 16 on its front side. When the conductive control part 16 is sleeved with the opening and closing mechanism, the cooling chamber 21 is connected to the cooling chamber 6.

[0033] The opening and closing mechanism controls the opening of cooling chamber 16. It opens when the opening control part 16 is sleeved and squeezed, thus connecting cooling chamber 16 and cooling chamber 21.

[0034] The opening and closing mechanism includes a central hole 12, a connecting port 13, a piston plate 14, and a spring 15. The central hole 12 is opened on the front of the stationary mold frame 1, and the connecting port 13 is opened inside the stationary mold frame 1. The two ends of the connecting port 13 are connected to the cooling chamber 6 and the central hole 12, respectively. The piston plate 14 is movably sleeved in the central hole 12. One end of the spring 15 is fixedly connected to the piston plate 14, and the other end is fixed in the central hole 12.

[0035] Piston plate 14 blocks the connecting port 13 and opens when squeezed and moved, and spring 15 facilitates elastic reset.

[0036] The second cooling chamber 21 includes a cooling ring cavity 211, an inlet hole 212, and an outlet hole 213. The cooling ring cavity 211 is located inside the moving mold frame 2. The inlet hole 212 is located on the front of the moving mold frame 2 and is connected to the cooling ring cavity 211. The outlet hole 213 is located at the bottom of the moving mold frame 2 and is connected to the cooling ring cavity 211.

[0037] Cooling chamber 21 is used to expand the cooling heat exchange area and improve cooling forming efficiency.

[0038] The conduction control unit 16 includes a conduction sleeve 161, a side opening 162, and a conduction hole 163. The conduction sleeve 161 is fixedly connected to the front of the moving mold frame 2. The side opening 162 is opened on the outer side of the conduction sleeve 161. The conduction hole 163 is opened on the inner end of the conduction sleeve 161. The conduction hole 163 communicates with the side opening 162 and communicates with the inlet hole 212.

[0039] The control unit 16 squeezes the piston plate 14 to complete the alignment and connection between the side opening 162 and the connecting opening 13, thus completing the connection process.

[0040] A method for preparing an injection mold with a high-hardness, wear-resistant coating includes the following preparation steps: Step 1: Mold substrate pretreatment, selecting substrate and performing rough machining, heat treatment and fine machining on the substrate in sequence; Step 2: Coating preparation. The cavity 4 and core 5 of the above-mentioned precision mold substrate are cleaned. After cleaning, a coating is deposited using the physical vapor deposition (PVD) method. Step 3: Perform post-coating treatment on the deposited surface, including polishing and passivation. Step 4: Conduct performance tests on the mold coating, including thickness testing, adhesion testing, hardness and wear resistance testing. After the tests are completed, the effective preparation is finished.

[0041] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An injection mold with a high-hardness wear-resistant coating, comprising a stationary mold frame (1), a moving mold frame (2), a gate (3), a cavity (4), and a core (5), characterized in that: The stationary mold frame (1) has a cooling chamber (6) inside. A cleaning component (8) is rotatably installed inside the cooling chamber (6). An agitator (9) is fixedly installed inside the cleaning component (8). An installation ring (10) is fixedly connected to one side of the cleaning component (8). An electromagnet (11) is fixedly nested on the side of the installation ring (10). A sleeve hole (20) is opened inside the stationary mold frame (1). The two ends of the sleeve hole (20) are respectively connected to the cavity (4) and the cooling chamber (6). An ejector pin assembly is installed inside the sleeve hole (20). A rotation drive (7) is provided on the outside of the stationary mold frame (1). The rotation drive (7) controls the rotation of the cleaning component (8). The ejector pin assembly includes an ejector pin (17), a retaining ring (18), and a second spring (19). The retaining ring (18) is fixedly sleeved in the sleeve hole (20). One end of the second spring (19) is fixedly connected to the retaining ring (18), and the other end is fixedly connected to the ejector pin (17). The ejector pin (17) is made of magnetic material.

2. The injection mold with a high-hardness wear-resistant coating according to claim 1, characterized in that: The inner wall of the cavity (4) and the outer side of the core (5) are provided with a high hardness wear-resistant coating. The high hardness wear-resistant coating includes a nitride coating, a carbon-based coating, a boride coating, a nano-reinforcing phase and a hard ceramic phase. The cavity (4) is opened on the front side of the stationary mold frame (1). The gate (3) is opened inside the stationary mold frame (1) and communicates with the cavity (4). The core (5) is fixed on the front side of the moving mold frame (2). The core (5) is adapted to the cavity (4).

3. The injection mold with a high-hardness wear-resistant coating according to claim 2, characterized in that: The cleaning assembly (8) includes a cleaning plate (81) and a cleaning frame (82), the cleaning frame (82) being fixed to the end face of the cleaning plate (81), and the cleaning plate (81) and the cleaning frame (82) being adapted to the inner side of the cooling chamber (6).

4. The injection mold with a high-hardness wear-resistant coating according to claim 3, characterized in that: The agitation assembly (9) includes a fixed shaft (91), a sleeve (92) and an agitation plate (93). The fixed shaft (91) is fixedly connected in the cleaning frame (82), the sleeve (92) is sleeved on the outer surface of the fixed shaft (91), and the agitation plate (93) is fixedly connected to the outer surface of the sleeve (92).

5. An injection mold with a high-hardness wear-resistant coating according to claim 4, characterized in that: The rotating drive component (7) includes a power motor (71), a rotating ring (72), a first gear (73), and a second gear (74). The power motor (71) is located on the outside of the stationary mold frame (1). The rotating ring (72) is rotatably sleeved inside the first cooling chamber (6). The first gear (73) is fixedly sleeved on the outer surface of the rotating ring (72). The second gear (74) is fixedly sleeved on the output shaft of the power motor (71) and is located in the first cooling chamber (6) and meshes with the first gear (73). The rotating ring (72) is fixedly connected to the cleaning assembly (8).

6. The injection mold with a high-hardness wear-resistant coating according to claim 1, characterized in that: The static mold frame (1) has an opening and closing mechanism on its front side. The moving mold frame (2) has an internal cooling chamber two (21). The moving mold frame (2) has a fixed conductive control part (16) on its front side. When the conductive control part (16) is sleeved with the opening and closing mechanism, the cooling chamber two (21) is connected to the cooling chamber one (6).

7. The injection mold with a high-hardness wear-resistant coating according to claim 6, characterized in that: The opening and closing mechanism includes a central hole (12), a connecting port (13), a piston plate (14), and a spring (15). The central hole (12) is opened on the front of the stationary mold frame (1), and the connecting port (13) is opened inside the stationary mold frame (1). The two ends of the connecting port (13) are respectively connected to the cooling chamber (6) and the central hole (12). The piston plate (14) is movably sleeved in the central hole (12). One end of the spring (15) is fixedly connected to the piston plate (14), and the other end is fixed in the central hole (12).

8. An injection mold with a high-hardness wear-resistant coating according to claim 7, characterized in that: The second cooling chamber (21) includes a cooling ring cavity (211), an inlet hole (212), and an outlet hole (213). The cooling ring cavity (211) is located inside the moving mold frame (2). The inlet hole (212) is located on the front of the moving mold frame (2) and is connected to the cooling ring cavity (211). The outlet hole (213) is located at the bottom of the moving mold frame (2) and is connected to the cooling ring cavity (211).

9. An injection mold with a high-hardness wear-resistant coating according to claim 8, characterized in that: The conduction control unit (16) includes a conduction sleeve (161), a side opening (162), and a conduction hole (163). The conduction sleeve (161) is fixedly connected to the front of the moving mold frame (2). The side opening (162) is opened on the outer side of the conduction sleeve (161). The conduction hole (163) is opened on the inner end of the conduction sleeve (161). The conduction hole (163) is connected to the side opening (162) and the conduction hole (163) is connected to the inlet hole (212).

10. A method for preparing an injection mold with a high-hardness wear-resistant coating according to any one of claims 1-9, characterized in that: The preparation steps include the following: Step 1: Mold substrate pretreatment, selecting substrate and performing rough machining, heat treatment and fine machining on the substrate in sequence; Step 2: Coating preparation. The cavity (4) and core (5) of the above-mentioned precision mold substrate are cleaned. After cleaning, the coating is deposited by PVD (physical vapor deposition). Step 3: Perform post-coating treatment on the deposited surface, including polishing and passivation. Step 4: Conduct performance tests on the mold coating, including thickness testing, adhesion testing, hardness and wear resistance testing. After the tests are completed, the effective preparation is finished.

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