Efficient injection mold for POM transmission part and forming process of efficient injection mold

Abstract

The invention discloses an efficient injection mold for a POM transmission part and a forming process of the efficient injection mold, and relates to the technical field of POM transmission part injection molding.The efficient injection mold comprises a base, a lower mold is fixedly installed above the base, a top plate is arranged above the lower mold, the four corners of the base and the four corners of the top plate are fixed through guide columns, and an upper mold is installed below the top plate; the contact surfaces of the lower die and the upper die are provided with forming cavities, the lower die is provided with first cooling pipes around the forming cavities, the upper die is provided with second cooling pipes around the forming cavities, the two sides of the upper end face of the lower die are provided with first connectors, and the two sides of the lower end face of the upper die are provided with second connectors. After the lower mold and the upper mold are assembled, the first connector and the second connector are communicated, and mold assembly positioning detection is carried out in the butt joint process, so that the problems that the cooling speed of a separated mold on a POM transmission part is low, and the forming effect of the transmission part is poor due to the fact that a cooling area is not uniform are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of POM transmission part injection molding, and specifically provides an efficient injection mold for POM transmission parts and its molding process. Background Art

[0002] The POM transmission part injection mold generally consists of a moving mold, a fixed mold, a cavity (female mold), a core (male mold), etc., which are used to form the shape and size of the POM transmission part. For example, the cavity and core of a POM gear mold will be precisely designed and processed according to parameters such as the tooth shape, module, and number of teeth of the gear, including the main runner, cold slug well, sub-runners, and gates. Since the POM material has relatively poor fluidity, the runner needs to be designed wide and smooth enough, such as using a trapezoidal or semi-circular sub-runner to reduce the flow resistance and ensure the filling speed. The gate position and size are designed corresponding to the shape, structure, and performance requirements of the POM transmission part.

[0003] For example, the Chinese authorized patent "A Gear Injection Mold" with the publication number CN213919332U includes a bottom plate. A workbench is fixedly installed on the top of the bottom plate. Installation plates are fixedly installed on both sides of the inner cavity of the workbench. A slide rail is opened in the inner cavity of the installation plate. A first slider is movably installed in the inner cavity of the slide rail. A connecting plate is fixedly connected to the inner side of the first slider. A lower mold base is fixedly connected to the inner side of the connecting plate. Fixed rods are fixedly installed on both sides of the inner cavity of the workbench and outside the installation plates.

[0004] Although the above-mentioned prior art can achieve the injection molding of POM transmission parts, since most molds are of a split design, the cooling channels can only be arranged in the fixed mold. Then, after the transmission part injection molding is completed, the range of the cooling capacity transmitted by the cooling channels is limited, which not only affects the cooling speed of the transmission part, but also reduces the quality of the transmission part due to uneven cooling areas. Therefore, it does not meet the existing requirements. For this reason, we propose an efficient injection mold for POM transmission parts and its molding process. Summary of the Invention

[0005] The purpose of the present invention is to provide an efficient injection mold for POM transmission parts and its molding process to solve the problems of slow cooling speed of the split mold for POM transmission parts and poor molding effect of the transmission part due to uneven cooling areas as mentioned in the above background art.

[0006] To achieve the above object, the present invention provides the following technical solution: An efficient injection mold for POM transmission parts, including a base, an under mold is fixedly installed above the base, a top plate is arranged above the under mold, and the four corners of the base and the top plate are fixed by guide columns. An upper mold is installed below the top plate, and both sides of the upper mold are slidably engaged with the guide columns. Forming cavities are provided on the contact surfaces of the under mold and the upper mold. A first cooling pipe is arranged around the forming cavity of the under mold, and a second cooling pipe is arranged around the forming cavity of the upper mold. First connectors are installed on both sides of the upper end surface of the under mold, and one of the first connectors is connected to one end of the second cooling pipe. Second connectors are installed on both sides of the lower end surface of the upper mold, and the water inlet and outlet of the second cooling pipe are respectively connected to the second connectors. After the under mold and the upper mold are closed, the first connector and the second connector are connected and communicated, and mold closing positioning detection is carried out during the docking process.

[0007] Preferably, the first connector includes a first sleeve, a threaded head is integrally formed at the lower end of the first sleeve, and the threaded head is threadedly connected to the under mold. A through hole is provided at the top of the first sleeve, and a push rod is arranged at the center position of the top of the first sleeve. A rubber gasket is adhesively fixed above the first sleeve.

[0008] Preferably, the second connector includes a second sleeve, and the second sleeve is threadedly connected to the upper mold. A sealing port is arranged inside the second sleeve, the lower end surface of the sealing port is flat and is in contact with the rubber gasket to seal the connection. The upper end surface of the sealing port is in a concave structure. A through hole is provided at the top of the second sleeve. An elastic telescopic assembly is installed at the upper end inside the second sleeve, and the elastic telescopic assembly is composed of a fixed pipe, a movable rod and a spring. A piston is fixedly installed at the bottom of the movable rod on the elastic telescopic assembly, and the sealing port is blocked under the support of the spring on the elastic telescopic assembly. After the under mold and the upper mold are closed, the push rod passes through the sealing port to push out the piston from the contact position with the sealing port.

[0009] Preferably, a boss is arranged at the middle position of the first sleeve, and six annularly distributed pressure sensors are arranged on the upper end surface of the boss. A movable ring is slidably limited at the upper end outside the first sleeve, and the lower end surface of the movable ring is in contact with the detection end of the pressure sensor.

[0010] Preferably, a coolant cavity is arranged at the upper end inside the base, a circulating pump is arranged above the coolant cavity, a water inlet pipe is installed at the water outlet end of the circulating pump, and the water inlet pipe is connected to the water inlet of the first cooling pipe. A water outlet pipe is arranged at the lower end of the other first connector, and the water outlet pipe extends into the coolant cavity.

[0011] Preferably, a medium cooling device is provided below the interior of the base. The medium cooling device is composed of an evaporator, a condenser, a compressor, and an expansion valve, and the evaporator is installed at the bottom of the coolant chamber.

[0012] Preferably, a support seat is fixedly installed above the top plate. A material box is installed at the upper end of the support seat, and the material box is slidably limited to the support seat. A feeding device is installed at the upper end of the upper mold, and the feeding device is connected to the material box through a high-temperature resistant hose.

[0013] Preferably, a driving seat is provided on one side of the upper end surface of the support seat. A turntable is rotatably installed inside the driving seat. A motor fixed to the driving seat is provided at the upper end of the turntable. A push rod is welded and fixed to one side of the driving seat. The push rod extends into the interior of the driving seat, and the push rod is slidably limited to the driving seat. A connecting rod is installed at an eccentric position on the upper end surface of the turntable through a rotating shaft. The other end of the connecting rod is connected to the push rod, and the connecting rod is connected to the push rod through a rotating shaft.

[0014] Preferably, lead screws are rotatably installed on both sides between the base and the top plate, and the lead screws are in threaded cooperation with the side plates of the upper mold. Servo motors connected to the lead screws are installed on both sides of the upper end surface of the top plate.

[0015] A forming method for an efficient injection mold for POM transmission parts includes the following steps:

[0016] Step 1: Turn on the heating device of the material box, put the POM material into the material box and heat it to melt.

[0017] Step 2: After the POM material melts, start the motor inside the driving seat. The output shaft of the motor drives the turntable to rotate at high speed. Under the action of the connecting rod, the push rod drives the material box to vibrate at high frequency. Through vibration, the bubbles in the molten material are discharged, improving the material density.

[0018] Step 3: The upper mold and the lower mold perform a mold closing operation. During the mold closing process, the first connector and the second connector come into contact. If the molds are not aligned properly, the movable ring slidably connected to the upper end of the outer part of the first connector will abut against the edge of the installation hole where the second connector is located. The pressure sensor installed at the bottom position corresponding to the movable ring of the first connector senses the pressure change in real time and feeds the data back to the control system. If the pressure value exceeds the preset range, the control system issues an alarm and pauses the mold action, and the operator makes adjustments; if the pressure value is normal, the mold continues to close until the upper mold and the lower mold are precisely aligned.

[0019] Step 4: When the mold closing is completed and the state is normal, inject the degassed material into the interior of the molding cavity through the feeding device.

[0020] Step 5: After the POM transmission part is injection-molded, turn on the circulation pump. The circulation pump transports the coolant inside the coolant chamber to the first cooling pipe inside the lower mold through the water inlet pipe to cool the transmission part in the lower mold part. Subsequently, the coolant enters the second cooling pipe inside the upper mold through the first connector and the second connector on one side to cool the transmission part in the upper mold part. Finally, the coolant flows back to the inside of the coolant chamber through the water outlet pipe via the first connector and the second connector on the other side, realizing the circulation of the entire cooling path;

[0021] Step 6: After the transmission part is cooled, the upper mold and the lower mold are separated. During the separation process, the first connector and the second connector move accordingly, and the ejector rod separates from the piston. Under the reset action of the elastic telescopic component, the piston moves towards the sealing port to close the second connector, preventing impurities from entering the cooling channel and coolant leakage, and completing one injection molding operation.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. In the present invention, cooling pipes are provided inside both the lower mold and the upper mold. The cooling channels of traditional split molds are limited to fixed molds, with limited cooling range and slow cooling speed. However, in this innovative mold, cooling pipes are arranged inside both the upper and lower molds. When the molds are closed, the cooling pipes are connected through a unique connection structure, and the circulation pump drives the coolant to circulate in the entire cooling path, from the lower mold to the upper mold, quickly removing heat in all directions, greatly improving the cooling speed, significantly shortening the injection molding cycle, and enhancing production efficiency; in the past, due to uneven cooling areas, the quality of POM transmission parts was prone to decline. The design of this mold enables the coolant to flow evenly through the upper and lower molds, evenly cooling each part of the transmission part, avoiding defects such as deformation and uneven internal stress caused by local overheating or overcooling, ensuring the dimensional accuracy and mechanical properties of the product are stable, significantly improving the product quality, and reducing the defective rate; during the opening and closing process of the mold, when the upper and lower molds are separated, the elastic telescopic component drives the piston to reset and close the second connector, preventing impurities from entering the cooling channel, avoiding blockage of the cooling pipe and affecting the cooling effect, and at the same time preventing coolant leakage, reducing equipment failures caused by impurities and leakage, reducing maintenance costs, extending the service life of the mold, and ensuring production continuity.

[0024] 2. By setting a positioning and detection mechanism between the first connector and the second connector, when the upper mold and the lower mold are accurately aligned, the effective docking between the connectors can be ensured. If there is a problem that the upper mold and the lower mold are misaligned due to equipment aging or other factors, as the upper mold descends, the first connector will come into contact with the second connector first. By installing a sliding-connected movable ring at the upper end outside the first connector, due to the position offset, the movable ring will abut against the edge of the mounting hole where the second connector is located, generating an extrusion force on the movable ring. By installing annularly distributed pressure sensors at the position corresponding to the bottom of the movable ring on the first connector, the pressure sensors can sense the pressure change in real time and feedback the pressure data to the control system. Once the pressure value exceeds the preset normal range, the control system can quickly determine that the mold is misaligned, immediately issue an alarm to remind the operator, and at the same time pause the subsequent actions of the mold. In this way, it can effectively avoid the connection failure of the cooling pipe and the leakage of the coolant caused by the poor docking of the mold, as well as the resulting product quality problems and mold damage, further ensuring the stability and reliability of the mold operation.

[0025] 3. By providing a jitter-type material box, after the POM material is heated and melted inside the material box, by turning on the motor inside the drive seat, its output shaft drives the turntable to rotate at high speed. Since the push rod is limited by the chute of the drive shaft, and both ends of the connecting rod are connected to the turntable and the push rod through rotating shafts respectively, therefore, under the action of the connecting rod, the push rod drives the material box to vibrate at high frequency. During the vibration process, the bubbles in the melted material can be discharged. Then, after injecting the material into the molding cavity through the injection device, the density of the material in the molding cavity is greatly improved. Because the bubbles are discharged in the early stage, the material will not have problems such as voids and looseness due to the existence of bubbles during the molding process, and the internal structure of the product is more compact and uniform. This not only makes the surface of the POM transmission part smoother and flatter, reducing surface defects, but also improves the strength and toughness of the transmission part. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a three-dimensional view of the present invention;

[0027] Figure 2 is a three-dimensional view of another perspective of the present invention;

[0028] Figure 3 is a schematic diagram of the internal structure of the present invention;

[0029] Figure 4 is a schematic diagram of the structures of the first connector and the second connector of the present invention;

[0030] Figure 5 is a schematic diagram of the transmission structure of the material box of the present invention.

[0031] In the figure: 1, base; 2, lower mold; 3, upper mold; 4, top plate; 5, forming cavity; 6, first connector; 7, guide post; 8, lead screw; 9, servo motor; 10, water inlet pipe; 11, water outlet pipe; 12, support base; 13, material box; 14, drive base; 15, injection device; 16, second connector; 17, first cooling pipe; 18, second cooling pipe; 19, coolant cavity; 20, circulation pump; 21, medium cooling device; 22, first sleeve; 23, threaded head; 24, rubber gasket; 25, ejector rod; 26, movable ring; 27, pressure sensor; 28, second sleeve; 29, seal port; 30, piston; 31, elastic telescopic assembly; 32, push rod; 33, turntable; 34, connecting rod. Detailed implementation mode

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0033] Please refer to Figures 1-5, an embodiment provided by the present invention: An efficient injection mold for POM transmission parts, including a base 1, a lower mold 2 is fixedly installed above the base 1, a top plate 4 is arranged above the lower mold 2, the four corners of the base 1 and the top plate 4 are fixed by guide columns 7, an upper mold 3 is installed below the top plate 4, and both sides of the upper mold 3 are slidably matched with the guide columns 7. Forming cavities 5 are provided on the contact surfaces of the lower mold 2 and the upper mold 3. A first cooling pipe 17 is arranged around the forming cavity 5 of the lower mold 2, and a second cooling pipe 18 is arranged around the forming cavity 5 of the upper mold 3. First connectors 6 are installed on both sides of the upper end surface of the lower mold 2, and one of the first connectors 6 is connected to one end of the second cooling pipe 18. Second connectors 16 are installed on both sides of the lower end surface of the upper mold 3, and the water inlet and outlet of the second cooling pipe 18 are respectively connected to the second connectors 16. After the lower mold 2 and the upper mold 3 are closed, the first connector 6 and the second connector 16 are communicated, and mold closing positioning detection is carried out during the docking process. The first connector 6 includes a first sleeve 22, a threaded head 23 is integrally formed at the lower end of the first sleeve 22, and the threaded head 23 is threadedly connected to the lower mold 2. A through hole is opened at the top end of the first sleeve 22, and a top rod 25 is arranged at the center position of the top end of the first sleeve 22. A rubber gasket 24 is adhesively fixed above the first sleeve 22. The second connector 16 includes a second sleeve 28, and the second sleeve 28 is threadedly connected to the upper mold 3. A sealing port 29 is arranged inside the second sleeve 28. The lower end surface of the sealing port 29 is flat and is in contact with the rubber gasket 24 to seal the connection. The upper end surface of the sealing port 29 is in a concave structure. A through hole is provided at the top end of the second sleeve 28. An elastic telescopic component 31 is installed at the upper end inside the second sleeve 28, and the elastic telescopic component 31 is composed of a fixed pipe, a movable rod and a spring. A piston 30 is fixedly installed at the bottom of the movable rod on the elastic telescopic component 31. The sealing port 29 is blocked under the support of the spring on the elastic telescopic component 31. After the lower mold 2 and the upper mold 3 are closed, the top rod passes through the sealing port 29 to push the piston 30 out of the contact position with the sealing port 29. A coolant cavity 19 is arranged at the upper end inside the base 1. A circulation pump 20 is arranged above the coolant cavity 19. The water outlet end of the circulation pump 20 is installed with a water inlet pipe 10, and the water inlet pipe 10 is connected to the water inlet of the first cooling pipe 17. The lower end of the other first connector 6 is provided with a water outlet pipe 11, and the water outlet pipe 11 extends into the coolant cavity 19.

[0034] During use, when the upper mold 3 and the lower mold 2 are closed, the first connector 6 will extend into the interior of the second connector 16. When the ejector rod 25 contacts the piston 30, the separation of the piston 30 from the sealing port 29 is achieved under the action of pressure. At this time, the first connector 6 and the second connector 16 are interconnected. After the upper mold 3 and the lower mold 2 are completely combined, the lower end of the sealing port 29 squeezes the rubber gasket 24 at the top of the first connector 6, thereby achieving the sealing at the edges of the first connector 6 and the second connector 16. At this time, the first cooling pipe 17 inside the first connector 6 and the second cooling pipe 18 inside the second connector 16 are connected. After the POM transmission part is injection-molded, the circulation pump 20 is turned on, and the coolant inside the coolant chamber 19 is transported to the first cooling pipe 17 through the water inlet pipe 10 to cool the part of the lower mold 2 where the transmission part is located. Then it enters the second cooling pipe 18 through the first connector 6 and the second connector 16 on one side to cool the distribution of the upper mold 3 where the transmission part is located. Finally, it flows back to the inside of the coolant chamber 19 through the first connector 6 and the second connector 16 on the other side through the water outlet pipe 11 to realize the circulation of the entire cooling path. After the transmission part is cooled, the upper mold 3 and the lower mold 2 are separated, and the first connector 6 and the second connector 16 also move accordingly. After the ejector rod 25 is separated from the piston 30, under the reset of the elastic telescopic assembly 31, the piston 30 moves towards the sealing port 29 again to close the second connector 16, preventing impurities from entering the cooling channel and avoiding coolant leakage.

[0035] Please refer to Figure 1 、 Figure 3 and Figure 4 , a boss is provided at the middle position of the first sleeve 22, and six annularly distributed pressure sensors 27 are provided on the upper end surface of the boss. The upper end of the outside of the first sleeve 22 is slidably limited with a movable ring 26, and the lower end surface of the movable ring 26 is in contact with the detection end of the pressure sensor 27. As the upper mold 3 descends, the first connector 6 will first contact the second connector 16. By installing a slidably connected movable ring 26 at the upper end of the outside of the first connector 6, due to the position offset, the movable ring 26 will abut against the edge of the mounting hole where the second connector 16 is located, generating an extrusion force on the movable ring 26. By installing annularly distributed pressure sensors 27 at the position corresponding to the bottom of the movable ring 26 on the first connector 6, the pressure sensors 27 can sense the pressure change in real time and feedback the pressure data to the control system. Once the pressure value exceeds the preset normal range, the control system can quickly judge that the mold is misaligned, immediately issue an alarm to remind the operator, and at the same time pause the subsequent actions of the mold. In this way, it can effectively avoid the connection failure of the cooling pipe and the coolant leakage caused by the poor docking of the mold.

[0036] Further, a medium cooling device 21 is provided below the interior of the base 1. The medium cooling device 21 is composed of an evaporator, a condenser, a compressor, and an expansion valve, and the evaporator is installed at the bottom of the coolant chamber 19.

[0037] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 5 , a support base 12 is fixedly installed above the top plate 4. A material box 13 is installed at the upper end of the support base 12, and the material box 13 is slidably limited with respect to the support base 12. A feeding device 15 is installed at the upper end of the upper mold 3, and the feeding device 15 is connected to the material box 13 through a high-temperature resistant hose. A driving base 14 is provided on one side of the upper end surface of the support base 12. A turntable 33 is rotatably installed inside the driving base 14. A motor fixed to the driving base 14 is provided at the upper end of the turntable 33. A push rod 32 is welded and fixed to one side of the driving base 14. The push rod 32 extends into the interior of the driving base 14, and the push rod 32 is slidably limited with respect to the driving base 14. A connecting rod 34 is installed at an eccentric position on the upper end surface of the turntable 33 through a rotating shaft. The other end of the connecting rod 34 is connected to the push rod 32, and the connecting rod 34 is connected to the push rod 32 through a rotating shaft;

[0038] After the POM material is heated and melted inside the material box 13, by turning on the motor inside the driving base 14, its output shaft drives the turntable 33 to rotate at high speed. Since the push rod 32 is limited by the chute of the driving shaft, and both ends of the connecting rod 34 are connected to the turntable 33 and the push rod 32 through rotating shafts respectively, under the action of the connecting rod 34, the push rod 32 drives the material box 13 to perform high-frequency vibration. During the vibration process, the bubbles in the melted material can be discharged. Then, after injecting the material into the molding cavity 5 through the feeding device 15, the density of the material in the molding cavity 5 is greatly improved. Because the bubbles are discharged in the early stage, the material will not have problems such as cavities and looseness due to the existence of bubbles during the molding process, and the internal structure of the product is more compact and uniform.

[0039] Please refer to Figure 1 , two lead screws 8 are rotatably installed on both sides between the base 1 and the top plate 4, and the lead screws 8 are in threaded cooperation with the side plates of the upper mold 3. Servo motors 9 connected to the lead screws 8 are installed on both sides of the upper end surface of the top plate 4.

[0040] A molding method for an efficient injection mold for POM transmission parts, characterized in that it includes the following steps:

[0041] Step 1: Turn on the heating device of the material box 13, put the POM material into the material box 13 and heat it until it melts;

[0042] Step 2: After the POM material is melted, the motor inside the driving seat 14 is started, and the motor output shaft drives the turntable 33 to rotate at high speed. Under the action of the connecting rod 34, the push rod 32 drives the material box 13 to vibrate at high frequency. Through vibration, the bubbles in the molten material are discharged to improve the density of the material;

[0043] Step 3, the upper mold 3 and the lower mold 2 perform mold closing operation. During the mold closing process, the first connector 6 contacts the second connector 16. If the molds are not aligned, the movable ring 26 slidably connected to the outer upper end of the first connector 6 will conflict with the edge of the mounting hole where the second connector 16 is located. The pressure sensor 27 installed at the bottom position of the movable ring 26 corresponding to the first connector 6 senses the pressure change in real time and feeds back the data to the control system. If the pressure value exceeds the preset range, the control system issues an alarm and suspends the mold action, and the operator makes adjustments; if the pressure value is normal, the mold continues to close until the upper mold 3 and the lower mold 2 are accurately aligned;

[0044] Step 4: When the mold is closed and in normal condition, the debubbled material is injected into the molding cavity 5 through the injection device 15;

[0045] Step 5: After the POM transmission part is injection molded, the circulation pump 20 is turned on. The circulation pump 20 transports the coolant in the cooling liquid cavity 19 to the first cooling pipe 17 in the lower mold 2 through the water inlet pipe 10 to cool the transmission part in the lower mold 2. Then, the coolant enters the second cooling pipe 18 in the upper mold 3 through the first connector 6 and the second connector 16 on one side to cool the transmission part in the upper mold 3. Finally, the coolant flows back to the cooling liquid cavity 19 from the first connector 6 and the second connector 16 on the other side through the water outlet pipe 11 to realize the circulation of the entire cooling path.

[0046] Step 6. After the transmission parts are cooled, the upper mold 3 and the lower mold 2 are separated. During the separation process, the first connector 6 and the second connector 16 move accordingly, and the push rod 25 is separated from the piston 30. Under the resetting action of the elastic telescopic component 31, the piston 30 moves toward the sealing port 29 to close the second connector 16, thereby preventing impurities from entering the cooling channel and cooling liquid from leaking, and completing an injection molding operation.

[0047] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An efficient injection mold for POM transmission parts, comprising a base (1), characterized in that: Above the base (1), a lower mold (2) is fixedly installed. Above the lower mold (2), a top plate (4) is provided. The four corners of the base (1) and the top plate (4) are fixed by guide columns (7). Below the top plate (4), an upper mold (3) is installed, and both sides of the upper mold (3) are slidably engaged with the guide columns (7). Forming cavities (5) are provided on the contact surfaces of the lower mold (2) and the upper mold (3). Around the forming cavity (5) of the lower mold (2), a first cooling pipe (17) is provided. Around the forming cavity (5) of the upper mold (3), a second cooling pipe (18) is provided. On both sides of the upper end surface of the lower mold (2), first connectors (6) are installed. One of the first connectors (6) is connected to one end of the second cooling pipe (18). On both sides of the lower end surface of the upper mold (3), second connectors (16) are installed. The water inlet and outlet of the second cooling pipe (18) are respectively connected to the second connectors (16). After the lower mold (2) and the upper mold (3) are clamped, the first connectors (6) and the second connectors (16) are connected and a clamping and positioning detection is carried out during the docking process.

2. The high-efficiency injection mold for a POM transmission part according to claim 1, characterized in that: The first connector (6) includes a first sleeve (22). At the lower end of the first sleeve (22), a threaded head (23) is integrally formed, and the threaded head (23) is threadedly connected to the lower mold (2). A through hole is provided at the top end of the first sleeve (22), and a push rod (25) is provided at the central position of the top end of the first sleeve (22). Above the first sleeve (22), a rubber gasket (24) is adhesively fixed.

3. The high-efficiency injection mold for POM transmission parts according to claim 2, characterized in that: The second connector (16) includes a second sleeve (28), and the second sleeve (28) is threadedly connected to the upper mold (3). A sealing port (29) is provided inside the second sleeve (28). The lower end surface of the sealing port (29) is flat and is in contact with the rubber gasket (24) for sealing the connection. The upper end surface of the sealing port (29) is in a concave structure. A through hole is provided at the top end of the second sleeve (28). An elastic telescopic component (31) is installed at the upper end inside the second sleeve (28), and the elastic telescopic component (31) is composed of a fixed pipe, a movable rod and a spring. A piston (30) is fixedly installed at the bottom of the movable rod on the elastic telescopic component (31). Under the support of the spring on the elastic telescopic component (31), the sealing port (29) is blocked. After the lower mold (2) and the upper mold (3) are clamped, the push rod passes through the sealing port (29) to push out the piston (30) from the contact position with the sealing port (29).

4. The high-efficiency injection mold for POM transmission parts according to claim 3, wherein: At the middle position of the first sleeve (22), a boss is provided. On the upper end surface of the boss, six annularly distributed pressure sensors (27) are provided. An activity ring (26) is slidably limited outside the upper end of the first sleeve (22), and the lower end surface of the activity ring (26) is in contact with the detection end of the pressure sensor (27).

5. The high-efficiency injection mold for POM transmission parts according to claim 4, characterized in that: At the upper end inside the base (1), a coolant chamber (19) is provided. Above the coolant chamber (19), a circulation pump (20) is provided. The water outlet end of the circulation pump (20) is equipped with a water inlet pipe (10), and the water inlet pipe (10) is connected to the water inlet of the first cooling pipe (17). At the lower end of the other first connector (6), a water outlet pipe (11) is provided, and the water outlet pipe (11) extends into the interior of the coolant chamber (19).

6. The high-efficiency injection mold for POM transmission parts according to claim 5, characterized in that: Below inside the base (1), a medium cooling device (21) is provided. The medium cooling device (21) consists of an evaporator, a condenser, a compressor, and an expansion valve, and the evaporator is installed at the bottom of the coolant chamber (19).

7. The high-efficiency injection mold for POM transmission parts according to claim 6, characterized in that: Above the top plate (4), a support base (12) is fixedly installed. At the upper end of the support base (12), a material box (13) is installed, and the material box (13) is slidably limited to the support base (12). At the upper end of the upper mold (3), a feeding device (15) is installed, and the feeding device (15) is connected to the material box (13) through a high-temperature resistant hose.

8. An efficient injection mold for POM transmission parts according to claim 7, characterized in that: On one side of the upper end surface of the support base (12), a driving base (14) is provided. Inside the driving base (14), a turntable (33) is rotatably installed. At the upper end of the turntable (33), there is a motor fixed to the driving base (14). On one side of the driving base (14), a push rod (32) is welded and fixed. The push rod (32) extends into the interior of the driving base (14), and the push rod (32) is slidably limited to the driving base (14). At an eccentric position on the upper end surface of the turntable (33), a connecting rod (34) is installed through a rotating shaft. The other end of the connecting rod (34) is connected to the push rod (32), and the connecting rod (34) is connected to the push rod (32) through a rotating shaft.

9. The high-efficiency injection mold for POM transmission parts according to claim 8, characterized in that: On both sides between the base (1) and the top plate (4), a lead screw (8) is rotatably installed, and the lead screw (8) is in threaded cooperation with the side plate of the upper mold (3). On both sides of the upper end surface of the top plate (4), a servo motor (9) connected to the lead screw (8) is installed.

10. The forming method of the high-efficiency injection mold for POM transmission parts according to claim 9, characterized in that: It includes the following steps: Step 1: Turn on the heating device of the material box (13), and put the POM material into the material box (13) for heating and melting. Step 2: After the POM material melts, start the motor inside the driving base (14). The output shaft of the motor drives the turntable (33) to rotate at a high speed. Under the action of the connecting rod (34), the push rod (32) drives the material box (13) to vibrate at a high frequency. Through vibration, the bubbles in the molten material are discharged, improving the material density. Step 3: The upper mold (3) and the lower mold (2) perform a mold closing operation. During the mold closing process, the first connector (6) and the second connector (16) come into contact. If the molds are not aligned properly, the movable ring (26) slidably connected to the upper end of the outside of the first connector (6) will abut against the edge of the mounting hole where the second connector (16) is located. The pressure sensor (27) installed at the bottom position of the first connector (6) corresponding to the movable ring (26) senses the pressure change in real time and feeds the data back to the control system. If the pressure value exceeds the preset range, the control system issues an alarm and pauses the mold operation, and the operator makes adjustments; if the pressure value is normal, the mold continues to close until the upper mold (3) and the lower mold (2) are precisely aligned. Step 4: When the mold closing is completed and the state is normal, the degassed material is injected into the interior of the molding cavity (5) through the injection device (15). Step 5: After the POM transmission part is injection molded, the circulation pump (20) is turned on. The circulation pump (20) transports the coolant inside the coolant chamber (19) through the water inlet pipe (10) to the first cooling pipe (17) inside the lower mold (2) to cool the transmission part in the lower mold (2). Then the coolant enters the second cooling pipe (18) inside the upper mold (3) through the first connector (6) and the second connector (16) on one side to cool the transmission part in the upper mold (3). Finally, the coolant flows back to the interior of the coolant chamber (19) through the water outlet pipe (11) via the first connector (6) and the second connector (16) on the other side, realizing the circulation of the entire cooling path. Step 6: After the transmission part is cooled, the upper mold (3) and the lower mold (2) are separated. During the separation process, the first connector (6) and the second connector (16) move accordingly, and the ejector rod (25) is separated from the piston (30). Under the reset action of the elastic telescopic component (31), the piston (30) moves towards the sealing port (29) to close the second connector (16), preventing impurities from entering the cooling channel and coolant leakage, and completing one injection molding operation.

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