A high-precision injection mold and its injection method

Abstract

This invention discloses a high-precision injection mold and its injection method. Applying the field of injection mold technology, this invention, through the cooperation of a secondary groove and an extension block, allows for the formation of flash along the outer side of the extension block when flash is generated at the edge of the injection molded part during injection molding. The provided receiving groove facilitates the reception of the flash cutting component. The flash cutting component can directly cut off the flash when it is generated in the injection molded part without the need for additional operation after the process is completed. During the cutting, the electric telescopic cylinder is activated, and the push plate pushes the cutter holder mechanism. The driven cutting blade contacts and cuts off the connection between the flash and the injection molded part.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of injection molds, and particularly relates to a high-precision injection mold and an injection molding method thereof. BACKGROUND

[0002] The injection mold is a combined plastic mold for compression molding, extrusion molding, injection molding, blow molding and low-foam molding. It mainly comprises a female mold with variable cavities composed of a female mold combination base plate, a female mold component and a female mold combination clamping plate, a male mold with a variable core composed of a male mold combination base plate, a male mold component, a male mold combination clamping plate, a mold cavity truncation component and a side truncation combination plate, and a mold male, female and auxiliary molding system that changes coordinately to process a series of molds with different shapes and sizes. The injection mold is matched with a plastic molding machine in the plastic processing industry and is a tool for giving plastic products complete configurations and accurate sizes. Since there are many types of plastics and processing methods, the injection mold is widely used.

[0003] At present, the Chinese patent with the publication number CN201921717836.8 discloses a stable injection mold. The injection mold comprises a mold body, the mold body comprises an upper mold and a lower mold, further comprises a bottom plate, the bottom surface of the lower mold is fixedly provided with a mounting block, the top surface of the bottom plate is provided with a mounting groove, two symmetrically distributed clamping blocks are arranged in the mounting groove, and a driving assembly is further arranged in the mounting groove; a left side plate is arranged on the top surface of the left side plate, a movable top plate is movably arranged on the top surface of the left side plate, and a hydraulic cylinder is further arranged on the top surface of the left side plate. After the upper mold and the lower mold are combined, the stable extrusion plate is driven by the hydraulic cylinder to move downward, the upper mold is further stabilized, the stability of the combination of the upper mold and the lower mold is ensured, and the quality of the plastic part is ensured. The manual adjustment assembly can be used to finely adjust the position of the upper mold after the combination, the accuracy of the combination of the upper mold and the lower mold is ensured, the lower mold is fixed by the mounting block and the movably arranged clamping blocks, and the injection mold is convenient to disassemble and assemble.

[0004] Although the existing injection mold has high precision, the injection mold will be aged after being used for a long time, the internal parts of the injection mold will be corroded to different degrees after aging, the movable mold and the fixed mold may deviate when cooperating, and the flash is generated when producing and processing. The cost of directly replacing the injection mold is high, so the excess flash can only be cut by manual operation, and the work efficiency is affected. SUMMARY

[0005] The application aims at the existing high-precision injection mold and injection molding method, and has the advantages of high precision.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: including a fixed mold, a moving mold disposed on the right side of the fixed mold, a secondary groove opened inside the fixed mold, a mold cavity opened on the left side of the secondary groove, an extension block located on the left side of the moving mold, a module located on the left side of the extension block, a receiving groove opened on the right side of the fixed mold, a flash trimming assembly disposed inside the receiving groove, a guide post installed on the right side of the fixed mold, and a lubrication assembly bolted to the inner wall of the left side of the moving mold. The flash trimming assembly includes an electric telescopic cylinder, a push plate, a cutter holder mechanism, and a cutting blade. The electric telescopic cylinder is bolted to the outside of the fixed mold. There are four electric telescopic cylinders. The telescopic shaft end of the electric telescopic cylinder passes through the fixed mold and extends to the inside of the receiving groove. The side of the electric telescopic cylinder near the mold cavity is movably installed with the push plate. The side of the push plate away from the electric telescopic cylinder is welded to the cutter holder mechanism. The inner side of the cutter holder mechanism is bolted to the cutting blade.

[0007] By adopting the above technical solution, and through the cooperation of the sub-groove and the extension block, if flash is generated at the edge of the injection molded part during the injection molding operation, the flash will form along the outer side of the extension block. The set receiving groove facilitates the reception of the flash cutting component. The flash cutting component can directly cut off the flash when it is generated in the injection molded part, without the need for additional operation after the process is completed. During the cutting, the electric telescopic cylinder is activated, and the push plate pushes the cutter holder mechanism. The driven cutting blade contacts and cuts off the connection between the flash and the injection molded part. The lubrication component can cooperate with the guide post. When the moving mold and the fixed mold deviate during mold closing after long-term use, the guide post is lubricated to avoid the reduction of structural life caused by friction.

[0008] The present invention is further configured such that: the tool holder mechanism includes a tool holder plate, a first clamping plate, a second clamping plate, a tool mounting screw, and a nut; the tool holder plate is welded to the side of the push plate away from the electric telescopic cylinder; the left side of the bottom of the tool holder plate is welded to the first clamping plate; the right side of the bottom of the tool holder plate is welded to the second clamping plate; a cutting blade is inserted between the opposite sides of the first clamping plate and the second clamping plate; the outer side of the tool mounting screw passes through the first clamping plate, the second clamping plate, and the cutting blade, and is threadedly connected to the nut.

[0009] By adopting the above technical solution, when replacing the cutting blade, the loading and unloading screw is unscrewed, the push plate along with the cutting blade and the cutting blade and the cutting blade and the cutting blade and the nut are separated, and the cutting blade is removed from between the first clamping plate and the second clamping plate and replaced.

[0010] The present invention is further configured such that: the inner wall of the first card plate is provided with a narrow hole, and the inner walls of the second card plate and the cutting blade are both provided with a wide hole, and the inner walls of the wide hole and the narrow hole are both inserted into the blade mounting screw.

[0011] By adopting the above technical solution, and by setting the narrow hole and the wide hole to match, it is easy to assemble with the shape of the tool screw, making the structure more reasonable.

[0012] The present invention is further configured such that: a loading and unloading disc is welded to the end of the telescopic shaft of the electric telescopic cylinder, and a loading and unloading groove is opened on the side of the push plate near the electric telescopic cylinder, and the outer side of the loading and unloading disc is inserted into the loading and unloading groove.

[0013] By adopting the above technical solution, and by setting up a loading and unloading tray and a loading and unloading trough, it is easy to connect or disassemble the electric telescopic rod and the push plate.

[0014] The present invention is further configured such that: a loading and unloading hole is provided on the inner side of the loading and unloading tray, a loading and unloading screw is rotatably connected to the inner side of the loading and unloading hole, and the outer side of the loading and unloading screw is threadedly connected to the bottom of the loading and unloading groove.

[0015] By adopting the above technical solution, and by setting loading and unloading holes and loading and unloading screws, the connection between the loading and unloading tray and the loading and unloading slot can be made stable and easy to disassemble. The design of the loading and unloading holes will not obstruct other structures due to the height of the loading and unloading screws.

[0016] The present invention is further configured such that: a narrow groove for passing through the cutter is formed on the inner wall of the fixed mold, the inner side of the narrow groove for passing through the cutter is used in conjunction with the cutting cutter, and the narrow groove for passing through the cutter is connected to the secondary groove and the receiving groove respectively.

[0017] By adopting the above technical solution and setting a narrow groove for cutting, the cutting blade can easily pass through and move inside the narrow groove, achieving the effect of cutting and making the structure more reasonable.

[0018] The present invention is further configured such that: the lubrication assembly includes an outer sleeve, an oil cavity, a contact plate, and a pressure spring; the outer sleeve is bolted to the left side of the moving mold; the inner side of the outer sleeve is movably sleeved with the guide post; the oil cavity is opened on the inner wall of the outer sleeve; the contact plate is movably installed on the inner wall of the outer sleeve; the side of the pressure spring near the contact plate is bolted to the contact plate; and the side of the pressure spring away from the contact plate is bolted to the outer sleeve.

[0019] Using the above technical solution, the lubrication component can cooperate with the guide post. After long-term use, when the moving mold and the fixed mold deviate during mold closing, the guide post will not directly pass through the interior of the outer sleeve of the post, but will press against the contact plate. The contact plate will retract into the oil cavity under force, and the lubricating oil will flow out from the oil cavity and lubricate the guide post, reducing the impact of excessive friction and reduced life of the guide post caused by deviation. When the guide post no longer presses against the contact plate, the pressure spring will drive the contact plate to reset.

[0020] The present invention is further configured such that: an injection groove is provided at the top of the outer sleeve of the column, and an oil injection nozzle is fixedly installed at the bottom of the inner wall of the injection groove.

[0021] By adopting the above technical solution, and by setting up an injection groove and an oil nozzle, it is easy to inject lubricating oil into the oil cavity.

[0022] The present invention is further configured such that: a limiting telescopic rod is welded to the side of the contact plate near the compression spring, and the side of the limiting telescopic rod away from the contact plate is welded to the outer sleeve of the column.

[0023] By adopting the above technical solution and setting a limiting telescopic rod, the movement of the contact plate can be easily restricted, avoiding large tilting that could prevent it from resetting.

[0024] The present invention is further configured as an injection molding method for a high-precision injection mold, comprising the following steps;

[0025] S1. Before processing, the moving mold moves and closes with the fixed mold, forming the desired shape of the injection molded part between the module and the mold cavity. The extension block and the mold cavity fit together and are in close contact. Liquid material is injected into the mold cavity between the moving mold and the fixed mold, and the material is allowed to cool and solidify. The flash of the molded part will overflow from the outside of the extension block.

[0026] S2. The electric telescopic cylinder is started, and through the push plate and the cutter holder mechanism, the cutting blade contacts and cuts off the connection between the flash and the injection part. After the mold is opened, the flash and the injection part are removed respectively.

[0027] S3. When replacing the cutting blade, unscrew the mounting screw, remove the push plate along with the cutting blade and the blade holder mechanism, separate the mounting screw and nut, and remove the cutting blade from between the first and second clamping plates and replace it.

[0028] In summary, the present invention has the following beneficial effects:

[0029] 1. By setting up a secondary groove and an extension block to cooperate, if flash is generated at the edge of the injection molded part during the injection molding operation, the flash will form along the outer side of the extension block. The set receiving groove facilitates the reception of the flash cutting component. The flash cutting component can directly cut off the flash when it is generated in the injection molded part without the need for additional operation after the process is completed. During the cutting, the electric telescopic cylinder is activated and pushes the cutter holder mechanism through the push plate. The driven cutting blade contacts and cuts off the connection between the flash and the injection molded part.

[0030] 2. The lubrication components can work with the guide pillars. After prolonged use, when the moving mold and the fixed mold deviate during mold closing, the guide pillar will not pass directly through the inner part of the outer sleeve of the pillar. Instead, it will press against the contact plate. The contact plate will retract into the oil cavity under force, and the lubricating oil will flow out from the oil cavity to lubricate the guide pillar. This reduces the impact of excessive friction and reduced lifespan of the guide pillar caused by deviation. When the guide pillar no longer presses against the contact plate, the pressure spring will drive the contact plate to reset, preventing continuous leakage of oil. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the main structure in this invention;

[0032] Figure 2 This is a schematic diagram of the guide post structure in this invention;

[0033] Figure 3 This is a schematic diagram of the structure of the moving mold in this invention;

[0034] Figure 4 This is a schematic diagram of the connection of the fixed mold in this invention;

[0035] Figure 5 This is a schematic diagram of the fixed mold structure in this invention;

[0036] Figure 6 This is a schematic diagram of the lubrication assembly in this invention;

[0037] Figure 7 This is a schematic diagram of the automatic installation system in this invention;

[0038] Figure 8 This is a schematic diagram of the tool holder mechanism in this invention;

[0039] Figure 9 This is a schematic diagram of the connection of the push plate in this invention;

[0040] Figure 10 This is a schematic diagram of the structure of the edge trimming component in this invention;

[0041] Figure 11 This is a schematic diagram of the internal connections of the fixed mold in this invention;

[0042] Figure 12 This is a schematic diagram of the internal structure of the fixed mold in this invention;

[0043] Figure 13 This is a flowchart of the injection molding method in this invention.

[0044] Reference numerals: 1. Fixed mold; 2. Moving mold; 3. Secondary groove; 4. Mold cavity; 5. Extension block; 6. Module; 7. Receiving groove; 8. Flash trimming assembly; 801. Electric telescopic cylinder; 802. Push plate; 803. Tool holder mechanism; 8031. Tool holder plate; 8032. First clamping plate; 8033. Second clamping plate; 8034. Tool mounting screw; 8035. Nut; 804. Cutting blade; 9. Lubrication assembly; 901. Column outer sleeve; 902. Oil cavity; 903. Contact plate; 904. Compression spring; 10. Guide post; 11. Narrow hole; 12. Wide hole; 13. Loading and unloading plate; 14. Loading and unloading groove; 15. Loading and unloading hole; 16. Loading and unloading screw; 17. Narrow groove for passing the tool; 18. Injection groove; 19. Oil injection nozzle; 20. Limiting telescopic rod. Detailed Implementation

[0045] The present invention will be further described in detail below with reference to the accompanying drawings.

[0046] Example 1:

[0047] refer to Figures 1-12A high-precision injection mold and its injection method are disclosed, comprising a fixed mold 1, a movable mold 2 disposed on the right side of the fixed mold 1, a secondary groove 3 formed inside the fixed mold 1, a mold cavity 4 formed on the left side of the secondary groove 3, an extension block 5 located on the left side of the movable mold 2, a module 6 located on the left side of the extension block 5, a receiving groove 7 formed on the right side of the fixed mold 1, and a flash trimming assembly 8 disposed inside the receiving groove 7. The flash trimming assembly 8 includes an electric telescopic cylinder 801, a push plate 802, a cutter holder mechanism 803, and a cutting blade 804. The electric telescopic cylinders 801 are fixedly connected to the outside of the fixed mold 1, and there are four electric telescopic cylinders 801. The telescopic shaft ends of the electric telescopic cylinders 801 penetrate the fixed mold 1 and extend to the inside of the receiving groove 7. One of the electric telescopic cylinders 801 is located near the mold cavity 4. The push plate 802 is movably installed on the side away from the electric telescopic cylinder 801. The side of the push plate 802 away from the electric telescopic cylinder 801 is fixedly connected to the cutter mechanism 803. The inner side of the cutter mechanism 803 is fixedly connected to the cutting blade 804. By setting the sub-groove 3 and the extension block 5, if flash is generated at the edge of the injection molded part during the injection molding operation, the flash will form along the outer side of the extension block 5. The set receiving groove 7 facilitates the reception of the flash cutting component 8. The flash cutting component 8 can directly cut off the flash when it is generated in the injection molded part without the need for additional operation after the process is completed. When cutting, the electric telescopic cylinder 801 is activated and pushes the cutter mechanism 803 through the push plate 802. The driven cutting blade 804 contacts and cuts off the flash. The connection between the edge and the injection molded part is cut off. The lubrication component 9 can cooperate with the guide post 10. After long-term use, when the moving mold 2 and the fixed mold 1 deviate during mold closing, the guide post 10 is lubricated to avoid the reduction of structural life caused by friction. The tool holder mechanism 803 includes a tool holder plate 8031, a first clamping plate 8032, a second clamping plate 8033, a tool mounting screw 8034, and a nut 8035. The tool holder plate 8031 ​​is fixedly connected to the side of the push plate 802 away from the electric telescopic cylinder 801. The left side of the bottom of the tool holder plate 8031 ​​is fixedly connected to the first clamping plate 8032, and the right side of the bottom of the tool holder plate 8031 ​​is fixedly connected to the second clamping plate 8033. The opposite sides of the first clamping plate 8032 and the second clamping plate 8033 are connected to the cut-off part. The cutting blade 804 is inserted, and the outer side of the tool-mounting screw 8034 passes through the first retaining plate 8032, the second retaining plate 8033, and the cutting blade 804, and is threadedly connected to the nut 8035. By setting a tool holder mechanism 803, when replacing the cutting blade 804, the loading and unloading screw 16 is unscrewed, the push plate 802 along with the cutting blade 804 and the tool holder mechanism 803 are removed, the tool-mounting screw 8034 and the nut 8035 are separated, and the cutting blade 804 is removed from between the first retaining plate 8032 and the second retaining plate 8033 and replaced. The inner wall of the first retaining plate 8032 has a narrow hole 11, and the inner walls of the second retaining plate 8033 and the cutting blade 804 both have wide holes 12. The inner walls of both the wide holes 12 and the narrow holes 11 are inserted into the tool-mounting screw 8034.By setting the narrow hole 11 and the wide hole 12 to fit together, it is easy to assemble with the shape of the loading screw 8034, making the structure more reasonable. The end of the telescopic shaft of the electric telescopic cylinder 801 is fixedly connected to the loading and unloading plate 13. The push plate 802 has a loading and unloading groove 14 on the side near the electric telescopic cylinder 801. The outer side of the loading and unloading plate 13 is inserted into the loading and unloading groove 14. By setting the loading and unloading plate 13 and the loading and unloading groove 14 to fit together, it is easy to connect or disassemble the electric telescopic rod and the push plate 802. The inner side of the loading and unloading plate 13 has a loading and unloading hole 15. The inner side of the loading and unloading hole 15 is rotatably connected to the loading and unloading screw 16. The outer side of the loading and unloading screw 16... The bottom of the loading / unloading groove 14 is threaded to the side. By using a loading / unloading hole 15 and a loading / unloading screw 16, the connection between the loading / unloading plate 13 and the loading / unloading groove 14 is secure and easy to remove. The design of the loading / unloading hole 15 prevents the height of the loading / unloading screw 16 from obstructing other structures. A narrow cutting groove 17 is formed on the inner wall of the fixed mold 1. The inner side of the narrow cutting groove 17 is used in conjunction with the cutting blade 804. The narrow cutting groove 17 communicates with both the secondary groove 3 and the receiving groove 7. By providing the narrow cutting groove 17, the cutting blade 804 can easily pass through and move within the narrow cutting groove 17, achieving a cutting effect and making the structure more rational.

[0048] Brief description of the usage process: After normal injection molding, the electric telescopic cylinder 801 is activated, and through the push plate 802 and the tool holder mechanism 803, the cutting blade 804 contacts and cuts off the connection between the flash and the injection molded part. After the mold is opened, the flash and the injection molded part are removed respectively. When it is difficult to cut off and the cutting blade 804 needs to be replaced, by unscrewing the loading and unloading screw 16, and removing the push plate 802 together with the cutting blade 804 and the tool holder mechanism 803, and separating the tool mounting screw 8034 and the nut 8035, the cutting blade 804 can be easily removed from between the first clamping plate 8032 and the second clamping plate 8033 and replaced.

[0049] Example 2:

[0050] refer to Figures 1-7A high-precision injection mold and its injection method are disclosed. The mold includes a fixed mold 1, a movable mold 2 located on the right side of the fixed mold 1, a guide post 10 mounted on the right side of the fixed mold 1, and a lubrication assembly 9 fixedly connected to the inner left wall of the movable mold 2. The lubrication assembly 9 includes an outer sleeve 901, an oil cavity 902, a contact plate 903, and a pressure spring 904. The outer sleeve 901 is fixedly connected to the left side of the movable mold 2, and its inner side is movably sleeved with the guide post 10. The oil cavity 902 is located on the outer sleeve. The inner wall of the auxiliary sleeve 901 is fitted with a contact plate 903, which is movably mounted on the inner wall of the outer auxiliary sleeve 901. A pressure spring 904 is fixedly connected to the contact plate 903 on the side closest to it, and to the outer auxiliary sleeve 901 on the side furthest from it. It can cooperate with the guide post 10 via the lubrication assembly 9. After prolonged use, when the moving mold 2 and the fixed mold 1 deviate during mold closing, the guide post 10 will not directly enter the interior of the outer auxiliary sleeve 901. Instead of passing through, it presses against the contact plate 903. The contact plate 903 retracts into the oil cavity 902 under force, and the lubricating oil flows out from the oil cavity 902 to lubricate the guide post 10, reducing the impact of excessive friction and reduced life of the guide post 10 caused by deviation. When the guide post 10 no longer presses against the contact plate 903, the pressure spring 904 will drive the contact plate 903 to reset. The top of the outer sleeve 901 of the column is provided with an injection groove 18, and the bottom of the inner wall of the injection groove 18 is fixedly installed with an oil injection nozzle 19. By setting the injection groove 18 and the oil injection nozzle 19 in cooperation, it is easy to inject lubricating oil into the oil cavity 902. The side of the contact plate 903 near the pressure spring 904 is fixedly connected to the limiting telescopic rod 20, and the side of the limiting telescopic rod 20 away from the contact plate 903 is fixedly connected to the outer sleeve 901 of the column. By setting the limiting telescopic rod 20, it is easy to limit the movement of the contact plate 903 and avoid large tilting that would prevent it from resetting.

[0051] Brief description of the usage process: By setting the outer sleeve 901 outside the movement trajectory of the guide post 10, when the guide post 10 enters the interior of the outer sleeve 901 and deviates, it will press against the contact plate 903. The contact plate 903 is compressed into the oil cavity 902 under force. The lubricating oil flows out from the gap between the oil cavity 902 and the contact plate 903 and lubricates the guide post 10, reducing the impact of excessive friction and reduced life of the guide post 10 caused by deviation. When the guide post 10 no longer presses against the contact plate 903, the compression spring 904 will push the contact plate 903 to achieve the effect of reset.

[0052] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A high-precision injection mold, comprising a fixed mold (1), a movable mold (2) disposed on the right side of the fixed mold (1), a secondary groove (3) formed inside the fixed mold (1), a mold cavity (4) formed on the left side of the secondary groove (3), an extension block (5) located on the left side of the movable mold (2), a module (6) located on the left side of the extension block (5), a receiving groove (7) formed on the right side of the fixed mold (1), a flash trimming assembly (8) disposed inside the receiving groove (7), a guide post (10) mounted on the right side of the fixed mold (1), and a lubrication assembly (9) bolted to the inner wall of the left side of the movable mold (2), characterized in that: The flash cutting assembly (8) comprises electric telescopic cylinders (801), a push plate (802), a cutter seat mechanism (803) and a cutting knife (804), the electric telescopic cylinders (801) are bolted on the outer side of the fixed mold (1), the number of the electric telescopic cylinders (801) is four, the telescopic shaft end portions of the electric telescopic cylinders (801) penetrate the fixed mold (1) and extend to the inner side of the accommodating groove (7), the side close to the mold cavity (4) of the electric telescopic cylinders (801) is movably installed with the push plate (802), the side away from the electric telescopic cylinders (801) of the push plate (802) is welded with the cutter seat mechanism (803), the inner side of the cutter seat mechanism (803) is bolted with the cutting knife (804); The cutter seat mechanism (803) comprises a cutter seat plate (8031), a first clamping plate (8032), a second clamping plate (8033), a cutter mounting screw rod (8034) and a nut (8035), the cutter seat plate (8031) is welded on the side away from the electric telescopic cylinders (801) of the push plate (802), the left side of the bottom of the cutter seat plate (8031) is welded with the first clamping plate (8032), the right side of the bottom of the cutter seat plate (8031) is welded with the second clamping plate (8033), the cutting knife (804) is inserted between the opposite sides of the first clamping plate (8032) and the second clamping plate (8033), the outer side of the cutter mounting screw rod (8034) penetrates the first clamping plate (8032), the second clamping plate (8033) and the cutting knife (804) and is threadedly connected with the nut (8035); The inner wall of the first clamping plate (8032) is provided with a narrow hole (11), the inner walls of the second clamping plate (8033) and the cutting knife (804) are provided with wide holes (12), and the inner walls of the wide holes (12) and the narrow hole (11) are inserted with the cutter mounting screw rod (8034); The telescopic shaft end portion of the electric telescopic cylinder (801) is welded with a mounting and dismounting disc (13), the side close to the electric telescopic cylinder (801) of the push plate (802) is provided with a mounting and dismounting groove (14), and the outer side of the mounting and dismounting disc (13) is inserted with the mounting and dismounting groove (14); The inner side of the mounting and dismounting disc (13) is provided with a mounting and dismounting hole (15), the inner side of the mounting and dismounting hole (15) is rotatably connected with a mounting and dismounting screw rod (16), and the outer side of the mounting and dismounting screw rod (16) is threadedly connected with the bottom of the mounting and dismounting groove (14); The inner wall of the fixed mold (1) is provided with a narrow knife passing groove (17), the inner side of the narrow knife passing groove (17) is used in cooperation with the cutting knife (804), and the narrow knife passing groove (17) is communicated with the sub groove (3) and the accommodating groove (7) respectively. The lubricating assembly (9) comprises a column outer secondary sleeve (901), an oil cavity (902), a contact plate (903) and a pressing spring (904), the column outer secondary sleeve (901) is bolted on the left side of the movable mold (2), the inner side of the column outer secondary sleeve (901) is movably sleeved with the guide column (10), the oil cavity (902) is arranged on the inner wall of the column outer secondary sleeve (901), the contact plate (903) is movably arranged on the inner wall of the column outer secondary sleeve (901), the pressing spring (904) is bolted on the side close to the contact plate (903), and the side away from the contact plate (903) is bolted on the column outer secondary sleeve (901); A pouring groove (18) is arranged on the top of the column outer secondary sleeve (901), and the oil nozzle (19) is fixedly arranged on the bottom of the inner wall of the pouring groove (18); The side close to the pressing spring (904) of the contact plate (903) is welded with the limiting telescopic rod (20), and the side away from the contact plate (903) of the limiting telescopic rod (20) is welded with the column outer secondary sleeve (901).

2. The injection molding method of a high-precision injection mold according to claim 1, characterized by: The method comprises the following steps: S1. Before processing, the movable mold (2) moves and is combined with the fixed mold (1), the shape of the required injection molded part is formed between the module (6) and the mold cavity (4), the extension block (5) is matched with the mold cavity (4) and is in close contact, the liquid material is injected into the mold cavity (4) between the movable mold (2) and the fixed mold (1), and the material is cooled and solidified, the flash of the molded part will overflow from the outside of the extension block (5); S2. The electric telescopic cylinder (801) is started, the cutting knife (804) is contacted and the connection between the flash and the injection molded part is cut through the pushing plate (802) and the knife seat mechanism (803), and the flash and the injection molded part are taken down after the mold is opened; S3. When the cutting knife (804) is replaced, the mounting and dismounting screw (16) is unscrewed, the pushing plate (802) is taken down together with the cutting knife (804) and the knife seat mechanism (803), the knife mounting screw (8034) and the nut (8035) are separated, and the cutting knife (804) is taken down from the first clamping plate (8032) and the second clamping plate (8033) and is replaced.

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