A manufacturing process for a high-precision lens barrel

Abstract

This invention provides a manufacturing process for high-precision lens barrels, belonging to the field of high-precision lens barrel manufacturing technology. It solves the problems of existing injection molds' traditional cold runner structures being unable to meet the filling requirements under conditions of multiple cavities and long runners, easily leading to insufficient filling and decreased precision. This invention utilizes an injection mold for molding, comprising, from top to bottom, an upper fixed plate, a fixed template, a runner plate, a moving template, and a lower fixed plate. The cavity extends downward from the runner plate, penetrates the moving template, and forms the molding part of the product body in the lower fixed plate. A hot runner system is provided in the upper fixed plate, and a cold runner is formed together in the runner plate and the moving template. A heat insulation mechanism is provided on the contact surface between the fixed template and the upper fixed plate. The advantages of this invention lie in the optimized runner structure and heat insulation design, achieving stable filling and efficient demolding.

Description

Technical Field

[0001] This invention relates to the field of high-precision lens barrel manufacturing technology, and in particular to a manufacturing process for a high-precision lens barrel. Background Technology

[0002] With the development of automotive intelligence, automotive lenses are increasingly widely used in systems such as autonomous driving, driver fatigue monitoring, and driving recording. As the core supporting structure of the lens, the dimensional accuracy, shape stability, and high-temperature resistance of the lens barrel directly determine the image quality and long-term reliability of the lens. Currently, high-end automotive lens barrels are generally made of polyphenylene sulfide (PPS) engineering plastic injection molding because PPS has excellent high-temperature resistance, dimensional stability, and mechanical strength.

[0003] However, the narrow manufacturing process window of PPS material poses a significant challenge to precision injection molding. Firstly, PPS requires extremely high molding temperatures, typically exceeding 300°C. Furthermore, to promote the orderly arrangement of PPS molecular chains and the formation of stable crystals for optimal performance, the mold temperature must also be maintained at a high level of around 150°C. Under these stringent process conditions, traditional pure cold runner mold systems encounter significant problems when dealing with multi-cavity (to improve production efficiency) and long runner layouts: as the high-temperature melt flows through the unheated cold runner, heat dissipates rapidly, leading to a decrease in the flow front temperature and a sharp increase in viscosity. This ultimately results in defects such as incomplete filling and obvious weld lines, severely impacting product dimensional accuracy and mechanical properties.

[0004] Secondly, PPS is prone to sticking to the mold and localized carbonization at high temperatures. Sticking to the mold leads to difficulty in demolding, damages the product surface, and reduces demolding efficiency; while impurities produced by carbonization contaminate the mold cavity, causing defects on the product surface and significantly reducing the product qualification rate. Summary of the Invention

[0005] The main objective of this invention is to overcome the shortcomings of the prior art and provide a high-precision lens barrel manufacturing process. This process effectively ensures the smooth filling and perfect crystallization of PPS melt under multi-cavity long flow channel conditions by optimizing the mold structure and strictly controlling the process parameters, thereby producing high-precision and high-performance lens barrel products.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A manufacturing process for a high-precision lens barrel utilizes an injection mold for molding. The injection mold includes, from top to bottom, an upper fixed plate, a fixed template, a runner plate, a moving template, and a lower fixed plate. The mold has multiple cavities for molding the main body of the product. The cavities extend downward from the runner plate, penetrate the moving template, and form the molding part of the main body of the product in the lower fixed plate. A hot runner system is provided in the upper fixed plate. The runner plate and the moving template together form a cold runner that communicates with the hot runner system. The cold runner includes a main runner connected to the outlet of the hot runner system and branch runners that communicate with the main runner and extend to each molding part. A heat insulation mechanism is provided on the contact surface between the fixed template and the upper fixed plate.

[0008] The manufacturing process is characterized by the following steps:

[0009] S1. The heating device in the hot runner system heats the PPS melt flowing through it and maintains it at an injection temperature of 300°C to 340°C; at the same time, the mold temperature of the fixed mold plate, runner plate, moving mold plate and lower fixed plate is maintained at 140°C to 160°C.

[0010] S2 and PPS melts are injected into the cold runner through the hot runner system; the melt flows sequentially through the main runner and branch runners, and is injected into the molding section of multiple cavities through the end gate of the branch runner; the melt forms the main body of the product in the cavity and the runner solidified material in the cold runner;

[0011] S3. Press the product body in the molding section of the lower fixed plate and complete the crystallization process of PPS material at a mold temperature of 140°C to 160°C.

[0012] S4. After the product has cooled and solidified initially, open the mold to separate the main body of the product from the solidified material in the runner.

[0013] S5. Remove the main product and the runner condensate.

[0014] In the manufacturing process of the high-precision lens barrel described above, in step S5, the product body and the runner slurry are removed from the mold by a transfer device.

[0015] In the above-mentioned high-precision lens barrel manufacturing process, the transfer device includes a clamping assembly and a driving component for moving the clamping assembly. The clamping assembly includes a clamping component one and a clamping component two. The clamping component one is used to clamp the product body, and the clamping component two is used to clamp the flow channel solidified material.

[0016] In the manufacturing process of the high-precision lens barrel described above, the heat insulation mechanism includes several heat insulation grooves formed on the upper surface of the fixed template, with one end of the heat insulation groove extending outward through the fixed template to make the inside and outside of the fixed template connected.

[0017] In the aforementioned high-precision lens barrel manufacturing process, the heat insulation mechanism includes several grid-like structures disposed on the upper surface of the fixed template, the grid-like structures being composed of several crisscrossing grooves.

[0018] In the manufacturing process of the high-precision lens barrel described above, a heat insulation plate is also provided on the upper surface of the upper fixing plate.

[0019] In the aforementioned high-precision lens barrel manufacturing process, the main gating system is divided into multiple segments along its length, and adjacent segments have different heights.

[0020] In the aforementioned high-precision lens barrel manufacturing process, each cavity is filled by three branch gating channels.

[0021] In the aforementioned high-precision lens barrel manufacturing process, a glue injection head is provided within the hot runner system, and the glue injection head is made of titanium alloy.

[0022] In the aforementioned high-precision lens barrel manufacturing process, a heating device is provided within the hot runner system.

[0023] In the aforementioned high-precision lens barrel manufacturing process, the heating device includes a heating coil.

[0024] In the aforementioned high-precision lens barrel manufacturing process, the inner surface of the cavity is provided with a coating, the coating material being titanium, and the coating thickness being 500 nanometers.

[0025] In the aforementioned high-precision lens barrel manufacturing process, the mold includes a screw for injecting PPS melt, and the screw has a hole through which nitrogen gas is injected into the screw during the injection molding process.

[0026] In the aforementioned high-precision lens barrel manufacturing process, the injection mold further includes a core assembly for molding the product. The core assembly includes an upper core block for molding the top surface of the product and a lower core block for molding the bottom surface of the product. The upper core block is fixedly connected to the runner plate, and the lower core block is fixedly connected to the lower fixed plate. When the mold is opened, the upper fixed plate, the fixed template, and the runner plate as a whole separate from the moving template and the lower fixed plate, causing the upper core block to separate from the product. The moving template separates from the lower fixed plate, causing the lower core block to separate from the product.

[0027] In the manufacturing process of the high-precision lens barrel described above, the core assembly further includes a side core block for forming the outer contour surface of the product. A beryllium copper block is provided at the bottom of the side core block, and the side core block and the beryllium copper block are attached and abutted against each other. A through hole is opened on the beryllium copper block, and the lower core block passes through the through hole upward and is attached and abutted against the beryllium copper block.

[0028] In the manufacturing process of the high-precision lens barrel described above, the injection mold further includes a cooling water system, which includes several cooling rods. The bottom of the lower core block has a hollow inner cavity, and the cooling rods are inserted upward into the inner cavity. The inner cavity is also filled with thermally conductive adhesive.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. Innovative hot runner and cold runner composite system: The system adopts a combined layout of hot runner and cold runner. The hot runner system ensures the temperature and fluidity of the melt before entering the mold, effectively solving the problem of heat loss during long-distance transport. The part near the cavity uses a cold runner. This composite design perfectly balances the filling performance and solves the problem of difficult filling of long runners with multiple cavities.

[0031] 2. Precise temperature zone control: By strictly controlling the melt temperature at 300℃-340℃ and the mold temperature at 140℃-160℃, the PPS melt is guaranteed to have good fluidity for perfect filling, and the optimal crystallization temperature environment is provided for PPS, ensuring that the product obtains high dimensional stability and mechanical properties.

[0032] 3. Solving the problems of sticking and carbonization: Reasonable mold temperature and efficient heat insulation mechanism avoid local overheating in the mold, reduce the risk of adhesion and thermal degradation (carbonization) caused by PPS melt staying on the surface of the cavity for a long time, thereby improving the smoothness of demolding and the surface quality of the product, and significantly improving the product qualification rate.

[0033] 4. Improved production efficiency and product precision: This process supports multi-cavity production, has strong flow channel filling capability, and effectively avoids the problem of precision degradation caused by insufficient filling. Through pressure holding and temperature-controlled crystallization, the product has low internal stress, low deformation, and good consistency, making it very suitable for large-scale mass production of high-precision lens barrels;

[0034] 5. The flow channel structure can balance the flow of hot and cold materials and avoid molding defects caused by uneven temperature. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the injection mold of the present invention;

[0036] Figure 2 This is a schematic diagram of the structure of the product body and the flow channel condensate of the present invention;

[0037] Figure 3 This is a schematic diagram of the heat insulation mechanism of the present invention;

[0038] Figure 4 This is a schematic diagram of the core assembly of the present invention;

[0039] Figure 5 This is an enlarged cross-sectional view of the core assembly of the present invention;

[0040] In the diagram, 1. Upper fixed plate; 2. Fixed template; 3. Runner plate; 4. Moving template; 5. Lower fixed plate; 6. Product body; 7. Main runner; 8. Branch runner; 9. Insulation groove; 10. Groove; 11. Insulation plate; 12. Runner slurry; 13. Upper core block; 14. Lower core block; 15. Side core block; 16. Beryllium copper block; 17. Cooling rod. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0042] like Figure 1 As shown, the manufacturing process of a high-precision lens barrel according to the present invention utilizes an injection mold for molding. The injection mold includes an upper fixed plate 1, a fixed template 2, a runner plate 3, a moving template 4, and a lower fixed plate 5 arranged from top to bottom. The mold has multiple cavities for molding the main body 6 of the product. The cavities extend downward from the runner plate 3, penetrate the moving template 4, and form the molding part of the main body 6 in the lower fixed plate 5. The upper fixed plate 1 is characterized by having a hot runner system, and the runner plate 3 and the moving template 4 together form a cold runner that communicates with the hot runner system. The cold runner includes a main runner 7 connected to the outlet of the hot runner system and branch runners 8 that communicate with the main runner 7 and extend to each molding part. A heat insulation mechanism is provided on the contact surface between the fixed template 2 and the upper fixed plate 1.

[0043] like Figure 3 As shown, the heat insulation mechanism includes several heat insulation grooves 9 formed on the upper surface of the fixed template 2, with one end of each groove extending outward through the fixed template 2 to allow communication between the inside and outside of the fixed template 2. The heat insulation mechanism also includes several grid-like structures on the upper surface of the fixed template 2, each grid-like structure consisting of several intersecting grooves 10. A heat insulation plate 11 is also provided on the upper surface of the upper fixed plate 1. The core function of the heat insulation plate 11 is to isolate the mold (especially the hot runner system) from heat transfer to the injection molding machine, reducing heat loss, saving energy, and assisting in stabilizing the hot runner process.

[0044] The primary pathway for heat transfer is direct contact between solids. On a flat contact surface without the insulating grooves 9, heat can be directly conducted over a large area from the upper fixed plate 1 (close to the hot runner system, where the temperature is higher) to the fixed platen 2. With the dense insulating grooves 9 or grids, only raised "ribs" or "islands" remain in contact between the fixed platen 2 and the upper fixed plate 1, resulting in a very small actual thermal conductivity cross-sectional area. Most of the area is separated by air. Since air is a poor conductor of heat, with a thermal conductivity far lower than that of metal (mold steel), the air filling the insulating grooves 9 and grids forms an effective air insulation layer. Heat must then be transferred via a path of "contact point (metal) – air (low thermal conductivity) – contact point (metal)," which significantly increases thermal resistance, making rapid heat conduction difficult.

[0045] The main gating system 7 is divided into multiple segments along its length, with adjacent segments having different heights. When the molten material flows through a step or changes direction, the drastic change in flow direction and magnitude disrupts the original laminar flow state. The high-temperature molten material at the center is forced towards the outer wall of the channel or the step surface, while the low-temperature molten material on the periphery is carried into the main flow region. This process generates strong shearing and mixing effects, similar to a static mixer, causing the molten material at the center and the outer edges to continuously exchange and mix, thereby leveling out the overall temperature difference and forming a more uniformly sized melt.

[0046] In traditional straight-through runners, when high-speed, high-pressure molten material rushes directly from a narrow runner opening into a wide cavity or channel, a "jetting" phenomenon occurs. The molten material flies out like a jet, first contacting the cavity wall, then folding and tangling together, leading to problems such as flow marks (serpentine patterns), gas lines, and uneven molecular orientation. The design of a flip-up runner, by setting steps of varying heights, forces a change in the flow direction of the molten material. Instead of being ejected in a straight line, the molten material must "flip over" a step and impact the runner wall. This impact causes the molten material to spread out, transforming the "jet flow" into a smooth, orderly "expanding flow," thus smoothly filling the cavity.

[0047] Each cavity is filled by three branch runners 8. For complex plastic parts, if there is only one injection point, the molten plastic needs to flow a long path to fill the cavity, which leads to a drop in the temperature at the front end and the formation of obvious and weak weld marks when they meet at the ends. Using three injection points shortens the flow path of the molten material, allowing the plastic to fill the cavity simultaneously from different directions, effectively avoiding weld marks caused by long flow paths. With single-point injection, the plastic molecules are highly stretched and oriented in the flow direction, resulting in uneven internal stress after cooling and solidification, causing product warping and deformation. Multi-point injection makes the plastic flow smoother and more symmetrical, and the molecular orientation more uniform, thereby significantly reducing internal stress, improving the dimensional stability and flatness of the product, and reducing the risk of warping and deformation. During the holding pressure stage, plastic shrinkage requires continuous replenishment. Multi-point injection allows the holding pressure to be transmitted more evenly to all areas of the product, ensuring consistent overall shrinkage and uniform density, thereby achieving better dimensional accuracy and mechanical properties.

[0048] The hot runner system includes a dispensing head made of titanium alloy. Titanium alloy maintains its mechanical properties at high temperatures (typically 400-600℃), ensuring structural integrity and stability under high temperature and pressure conditions. Titanium alloy has low thermal conductivity, meaning heat is less likely to dissipate from the dispensing head into the mold, which is highly advantageous for processes requiring high temperatures to prevent premature melt solidification. This effectively reduces drooling and cold material blockage, making it particularly suitable for hot runner systems. The hot runner system also includes a heating device, comprising heating coils.

[0049] The inner surface of the mold cavity is coated with a titanium coating with a thickness of 500 nanometers. This coating serves as a lubricant, preventing product sticking and improving demolding smoothness.

[0050] The mold includes a screw for injecting PPS melt. The screw has holes through which nitrogen gas is injected during injection molding to expel oxygen from the molten plastic, preventing oxidation and carbonization reactions at high temperatures and ensuring material stability. Nitrogen injection must continue throughout the entire injection process: a continuous supply of gas from start to finish ensures the melt remains in an inert gas protective environment.

[0051] like Figure 4 and Figure 5As shown, the injection mold also includes a core assembly for molding the product. This core assembly includes an upper core block 13 for molding the top surface of the product and a lower core block 14 for molding the bottom surface of the product. The upper core block 13 is fixedly connected to the runner plate 3, and the lower core block 14 is fixedly connected to the lower fixed plate 5. During mold opening, the upper fixed plate 1, the fixed template 2, and the runner plate 3 first separate from the moving template 4 and the lower fixed plate 5 as a whole, causing the upper core block 13 to detach from the top surface of the product. Subsequently, the moving template 4 separates from the lower fixed plate 5, causing the lower core block 14 to detach from the bottom surface of the product. This step-by-step separation method avoids the product being subjected to demolding forces from multiple directions simultaneously, reducing deformation or damage caused by adhesion or clamping forces. Lens barrels typically have a high aspect ratio or fine structure; step-by-step demolding can more smoothly release the adhesion between the product and the core, making it particularly suitable for products with high precision and high surface quality requirements.

[0052] The core assembly also includes a side core block 15 for molding the outer contour surface of the product. A beryllium copper block 16 is located at the bottom of the side core block 15, and the side core block 15 and the beryllium copper block 16 are fitted together. A through hole is formed in the beryllium copper block 16, through which the lower core block 14 passes upward and fits together with the beryllium copper block 16. Beryllium copper has excellent thermal conductivity, which can quickly dissipate the heat accumulated in the side core block 15, preventing localized overheating. The beryllium copper block 16 acts as a heat conduction medium, enabling more uniform heat exchange between the side core block 15 and the lower core block 14, reducing uneven product shrinkage or internal stress concentration caused by temperature differences. The close fit between the beryllium copper block 16 and the side core block 15 and the lower core block 14 provides structural support and forms an efficient heat conduction path, helping to maintain the overall temperature stability of the mold.

[0053] The injection mold also includes a cooling water system comprising several cooling rods 17. The bottom of the lower core block 14 has a hollow inner cavity, into which the cooling rods 17 are directly inserted. This allows the cooling medium to contact the core at close range and over a large area, quickly removing heat. The thermally conductive adhesive filling the inner cavity tightly seals the gaps between the cooling rods 17 and the inner wall, eliminating the air insulation layer and significantly improving heat transfer efficiency. PPS is a semi-crystalline material, and its crystallinity and uniformity directly affect the dimensional stability and mechanical properties of the product. Through efficient and uniform cooling, PPS can complete a full and uniform crystallization process within the cavity during the holding pressure stage (140-160℃), reducing defects such as shrinkage marks and warping. Rapid cooling accelerates product setting, reduces mold opening waiting time, and improves production efficiency.

[0054] To ensure high-precision molding, the mold temperature must be highly uniform (temperature difference controlled within 5℃), and the water channel layout must be fully covered and balanced to prevent localized overheating that could lead to product defects. By directly connecting temperature and pressure sensors to the machine control system, real-time feedback and adjustment of temperature and pressure are achieved, avoiding the lag problem of traditional indirect control via temperature controllers.

[0055] The melt is made of high-temperature corrosion-resistant PPS plastic. Because the product needs to be heat-resistant, rigid, and flame-retardant, PPS material is chosen. However, the characteristics of PPS plastic—its tendency to carbonize easily at high temperatures and its strong corrosiveness—place higher demands on the mold steel. Therefore, ordinary steel cannot be used; the mold of this invention uses imported corrosion-resistant and wear-resistant special mold steel.

[0056] The manufacturing process for a high-precision lens barrel according to the present invention includes the following steps:

[0057] S1. The PPS melt flowing through the hot runner system is heated and maintained at an injection temperature of 300°C to 340°C by the heating device in the hot runner system; at the same time, the mold temperature controller is started to introduce high temperature oil or hot water into the cooling / heating pipes in the fixed mold plate 2, runner plate 3, moving mold plate 4 and lower fixed plate 5, so that the working temperature of the entire mold is stabilized at 140°C to 160°C.

[0058] S2. The pre-plasticized PPS melt is injected into the hot runner system. The melt remains in a high-temperature flowing state within the hot runner and is then pushed into the cold runner. Driven by injection pressure, the melt rapidly fills the main runner 7 and is simultaneously injected into the molding sections of all cavities via the branch runners 8; as shown... Figure 2 As shown, the melt forms the main product 6 in the cavity and the runner solid 12 in the cold runner;

[0059] S3. After the melt fills the mold cavity, the process transitions to the holding pressure stage. The holding pressure continues to act on the still-molten PPS to compensate for material shortages caused by cooling shrinkage, ensuring product density and dimensions. During this process, the mold is maintained at a high temperature of 140℃ to 160℃, providing sufficient crystallization conditions for the PPS material, allowing its molecular chains to arrange regularly and form a stable crystal structure, thus giving the product body excellent heat resistance and dimensional stability.

[0060] S4. After the pressure holding period, the product is allowed to cool naturally within the cavity for a period of time to allow its surface layer to solidify sufficiently. Upon mold opening, the solidified runner material 12 in the cold runner remains at the interface between the runner plate 3 and the moving mold plate 4, while the main body of the product 6 remains on the moving mold side. During mold opening, the brittle gate will be pulled apart at the connection point between the branch runner 8 and the main body of the product 6, achieving automatic separation.

[0061] S5. Remove the main product 6 and the flow channel condensate 12.

[0062] In step S5, the product body 6 and the runner solidified material 12 can be automatically removed from the mold by a transfer device. The transfer device includes a clamping assembly and a driving component that drives the clamping assembly to move. The clamping assembly includes clamping component one and clamping component two. After the mold opens, the driving component drives the clamping assembly to move. Clamping component one clamps the product body 6, and clamping component two clamps the runner solidified material 12. The driving component moves the product body 6 and the runner solidified material 12 out of the mold. Through two collection boxes set outside the mold, the driving component moves to the top of the collection boxes, clamping component one and clamping component two are released, and the product body 6 and the runner solidified material 12 fall into the corresponding collection boxes respectively.

[0063] It should be understood that in the claims and description of this invention, all instances of "comprising..." should be understood as having an open meaning, that is, their meaning is equivalent to "containing at least...", and should not be understood as having a closed meaning, that is, their meaning should not be understood as "containing only...".

[0064] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A manufacturing process of a high-precision lens barrel, which is formed by using an injection mold, the injection mold comprising, from top to bottom, an upper fixed plate (1), a fixed mold plate (2), a runner plate (3), a movable mold plate (4), and a lower fixed plate (5), the mold being provided with a plurality of cavities for forming product bodies (6), the cavities extending downward from the runner plate (3), penetrating the movable mold plate (4), and forming forming portions of the product bodies (6) in the lower fixed plate (5); the upper fixed plate (1) being provided with a hot runner system, the runner plate (3) and the movable mold plate (4) being jointly provided with a cold runner in communication with the hot runner system, the cold runner comprising a main runner (7) connected to an outlet of the hot runner system and branch runners (8) in communication with the main runner (7) and extending to the forming portions; the fixed mold plate (2) being provided with a heat insulation mechanism on a contact surface thereof with the upper fixed plate (1); characterized in that the manufacturing process comprising the following steps: S1, a heating device in the hot runner system heats PPS melt flowing therethrough and maintains the injection temperature at 300-340°C; at the same time, the mold temperature of the fixed mold plate (2), the runner plate (3), the movable mold plate (4), and the lower fixed plate (5) is maintained at 140-160°C; S2, the PPS melt is injected into the cold runner through the hot runner system; the melt flows through the main runner (7) and the branch runners (8) in sequence, and is injected into the forming portions of the plurality of cavities through the end gates of the branch runners (8); the melt forms the product bodies (6) in the cavities and forms a runner compact (12) in the cold runner; S3, the product bodies (6) are pressure maintained in the forming portions of the lower fixed plate (5), and the crystallization process of the PPS material is completed at a mold temperature of 140-160°C; S4, after the product is preliminarily cooled and shaped, the mold is opened, and the product bodies (6) are separated from the runner compact (12); S5, the product bodies (6) and the runner compact (12) are taken out.

2. The manufacturing process of a high precision lens barrel according to claim 1, wherein In step S5, the product bodies (6) and the runner compact (12) are taken out from the mold by a transfer device; the transfer device comprises a clamping assembly and a driving member for driving the clamping assembly to move, the clamping assembly comprising a first clamping member for clamping the product bodies (6) and a second clamping member for clamping the runner compact (12).

3. The manufacturing process of a high precision lens barrel according to claim 1, wherein The heat insulation mechanism comprises a plurality of heat insulation grooves (9) formed on the upper surface of the fixed mold plate (2), one end of each heat insulation groove (9) penetrating the fixed mold plate (2) to communicate the inside and outside of the fixed mold plate (2); the heat insulation mechanism further comprises a plurality of grid structures provided on the upper surface of the fixed mold plate (2), each grid structure being composed of a plurality of longitudinally and transversely intersecting grooves (10).

4. The manufacturing process of a high precision lens barrel according to claim 1, wherein The main runner (7) is divided into multiple segments along its length direction, and the heights of adjacent segments are different.

5. The manufacturing process of a high precision lens barrel according to claim 1, wherein Each cavity is filled by three branch runners (8).

6. The manufacturing process of a high precision lens barrel according to claim 1, wherein The inner surface of the cavity is provided with a plating layer, the material of the plating layer being titanium, and the thickness of the plating layer being 500 nanometers.

7. The manufacturing process of a high precision lens barrel according to claim 1, wherein The mold comprises a screw for injecting the PPS melt, a hole being formed in the screw, and nitrogen being injected into the screw through the hole during the injection molding process.

8. The manufacturing process of a high precision lens barrel according to claim 1, wherein The injection mold further comprises a core assembly for forming the product, the core assembly comprising an upper core block (13) for forming a top surface of the product, a lower core block (14) for forming a bottom surface of the product, the upper core block (13) being fixedly connected to the runner plate (3), and the lower core block (14) being fixedly connected to the lower fixed plate (5); when the mold is opened, the upper fixed plate (1), the fixed mold plate (2) and the runner plate (3) are separated from the movable mold plate (4) and the lower fixed plate (5) as a whole, and the upper core block (13) is separated from the product; the movable mold plate (4) is separated from the lower fixed plate (5), and the lower core block (14) is separated from the product.

9. The manufacturing process of a high precision lens barrel according to claim 8, wherein The core assembly further comprises a side core block (15) for forming an outer contour surface of the product, the bottom of the side core block (15) being provided with a beryllium copper block (16), and the side core block (15) being abutted against the beryllium copper block (16); a through hole is formed in the beryllium copper block (16), and the lower core block (14) passes through the through hole upward and is abutted against the beryllium copper block (16).

10. The manufacturing process of a high precision lens barrel according to claim 8, wherein The injection mold further comprises a cooling water channel system, the cooling water channel system comprising a plurality of cooling rods (17), the bottom of the lower core block (14) being provided with a hollow inner cavity, and the cooling rods (17) being inserted into the inner cavity upward; the inner cavity is further filled with a heat-conducting glue.

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