A mold with a mobile phone screen lens cutting assembly

Abstract

The utility model discloses a mould with mobile phone screen lens shearing assembly, include: fixed mould unit and install on the core of movable mould unit, be provided with the cavity between fixed mould unit and the core, and the molten plastic liquid is injected into the cavity through the runner, and the lens workpiece is formed, the utility model discloses through the shearing in mould, completely solve the lens workpiece edge gate residual problem. Realize injection molding - shearing - demoulding integrated operation. Meanwhile, the shearing action is embedded in the injection molding cycle, and the single piece production rhythm is shortened by 4 seconds or more, and the yield is improved to 99.2%, and it is significantly adapted to the high -speed automatic production line. Compared with the prior art, not only avoids the yield loss of 8% to 12% and the efficiency bottleneck of offline shearing, but also reduces the comprehensive cost by 15% through in-situ treatment in the mould, ensures the optical performance of the lens and the reliability of the terminal product, and meets the stringent production demand of the intelligent mobile phone for the precision assembly.

Description

Technical Field

[0001] This utility model is a mold with a mobile phone screen lens cutting component, belonging to the field of mold technology. Background Technology

[0002] As a high-precision optical component, mobile phone screen lenses require micron-level dimensional accuracy and edge smoothness during injection molding to meet the stringent requirements of smartphones for display quality, scratch resistance, and assembly compatibility. While traditional molds can complete the basic molding, gates or flash often remain on the edges of the lens workpiece, requiring subsequent processing, which restricts the efficiency of automated production and product consistency.

[0003] Existing molds generally lack integrated shearing mechanisms, resulting in residual gate systems on the edges after lens demolding, which must be trimmed manually or with offline equipment.

[0004] Traditional molds do not have synchronous shearing units at the edge of the cavity, and the separation of the gate from the workpiece relies on external force after demolding; Manual cutting is prone to causing dimensional deviations (above ±0.05mm), edge burrs, or surface scratches due to uneven force, which significantly reduces the yield. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a mold with a mobile phone screen lens cutting component to solve the problems of the existing technology.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: A mold with a mobile phone screen lens cutting assembly includes: a fixed mold unit and a core mounted on a moving mold unit; A cavity is provided between the fixed mold unit and the core. Molten plastic liquid is injected into the cavity through the flow channel to form a lens workpiece. A shearing assembly is disposed inside the fixed mold unit. The shearing assembly includes a cutter whose blade fits against the edge of the cavity and a drive assembly that drives the cutter to rise / fall. A control module is electrically connected to the drive assembly, which controls the cutter to rise and shear the lens workpiece in the cavity.

[0007] As a further improvement, a heating component is also included inside the cutter. The control module is electrically connected to the heating component and controls the heating component to heat the cutting edge of the cutter near the edge of the cavity.

[0008] As a further improvement, the cutter has a cavity close to the blade, and the heating assembly includes a heating element embedded in the cavity. The heating element is tightly fitted to the inner wall of the cavity, and the heating element is electrically connected to the control module.

[0009] As a further improvement, the drive assembly includes an electric guide rod and a guide rod, the guide rod being fixed inside the fixed mold unit to constrain the cutter to move in the vertical direction.

[0010] As a further improvement, a temperature monitoring module is also included, which includes an embedded thermocouple and a signal amplifier; The embedded thermocouple is installed in the groove of the cavity sidewall, with its temperature measuring end in close contact with the inner surface of the cavity, for real-time acquisition of temperature data of the molten plastic material; the signal amplifier is electrically connected to the control module, converting the temperature signal into a digital signal, and when the temperature drops to 10-20°C above the glass transition point of the molten plastic material, it triggers the control module to drive the drive component to operate.

[0011] As a further improvement, the cutting blade has a stepped double-beveled structure, including a first beveled surface and a second beveled surface; The first beveled surface has an angle of 15-25 degrees with the plane perpendicular to the direction of the cutter's movement, and the second beveled surface has an angle of 5-10 degrees with the plane perpendicular to the direction of the cutter's movement. The heating element is located on the side closer to the second beveled surface. The surface of the blade is mirror-polished, with a roughness Ra≤0.2μm.

[0012] As a further improvement, the second beveled surface faces the side of the lens workpiece, and the first beveled surface is away from the side of the lens workpiece.

[0013] As a further improvement, the heating element is a ceramic-based PTC self-regulating heating element, the groove depth of the cavity is 1 / 3 to 1 / 2 of the thickness of the cutting blade, and the control module adjusts the power supply voltage of the heating element through pulse width modulation to maintain the blade temperature at 120-140°C.

[0014] As a further improvement, a safety interlock mechanism is also included, which comprises a pressure sensor and an electromagnetic lock; The pressure sensor is embedded in the closing surface of the moving mold unit and is used to detect the closing pressure between the fixed mold unit and the moving mold unit; The electromagnetic lock is installed on the transmission path of the drive assembly. When the closing pressure is lower than 80% of the mold's rated closing pressure, the control module controls the electromagnetic lock to lock the cutter's movement.

[0015] As a further improvement, the electromagnetic lock includes a movable pin, the end of which has a T-shaped structure; The cutter has a T-shaped locking groove on its side that matches the movable pin. When the closing pressure is lower than 80% of the mold's rated closing pressure, the control module controls the movable pin to insert into the T-shaped locking groove via the electromagnetic lock to lock the cutter position. When the closing pressure is higher than 80% of the mold's rated closing pressure, the control module controls the movable pin to disengage from the T-shaped locking groove via the electromagnetic lock, thus unlocking the cutter's active state.

[0016] Beneficial effects: This invention completely solves the problem of residual gates at the edge of lens workpieces by in-mold shearing. Specifically, a cutter that fits the edge of the cavity and a high-precision drive assembly are set inside the fixed mold unit, which is controlled in real time by the control module: during the injection molding and cooling stage, the control module precisely triggers the drive assembly, causing the cutter to rise synchronously along the cavity contour, and instantly shear the edge of the lens before demolding, directly cutting off the gate system, realizing an integrated operation of injection molding-shearing-demolding.

[0017] When in use, you only need to set the control parameters during the mold operation, such as the shearing sequence and force, and the system will automatically complete the shearing action without manual intervention, ensuring that the lens workpiece achieves optical-grade edge smoothness and micron-level dimensional accuracy of ±0.02mm upon demolding.

[0018] Eliminating reliance on secondary processes, the zero-gap fit between the cutter and the cavity edge ensures burr-free cutting, avoiding dimensional deviations caused by traditional manual operation, typically improving by ±0.03mm and surface scratches; Meanwhile, the shearing action is embedded in the injection molding cycle, reducing the production cycle time per piece by more than 4 seconds and increasing the yield to 99.2%, making it significantly suitable for high-speed automated production lines. Compared with existing technologies, it not only avoids the 8%~12% yield loss and efficiency bottleneck of offline shearing, but also reduces the overall cost by 15% through in-situ processing within the mold, ensuring the optical performance of the lens and the reliability of the end product, and meeting the stringent mass production requirements of smartphones for precision components. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of a mold with a mobile phone screen lens cutting component according to the present invention.

[0021] Figure 2 This is a side view schematic diagram of a mold structure with a mobile phone screen lens cutting component according to the present invention.

[0022] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure at point A in the middle.

[0023] Figure 4 This is an enlarged schematic diagram of the electromagnetic lock and the cutter in the working state of this utility model.

[0024] Figure 5 This is a schematic diagram of the internal structure of a fixed mold unit according to the present invention.

[0025] Figure 6 This is a schematic diagram of the mold module connection of a mobile phone screen lens cutting component according to the present invention.

[0026] 1. Fixed mold unit; 2. Core; 3. Cavity; 31. Runner; 4. Lens workpiece; 5. Cutting blade; 51. Blade; 52. Cavity; 53. First beveled surface; 54. Second beveled surface; 55. Electromagnetic lock; 56. Pressure sensor; 57. Heating element; 6. Control module; 61. Electric linear guide rod; 62. Temperature monitoring module; 63. Signal amplifier; 64. Embedded thermocouple; 551. Movable pin; 552. T-shaped locking groove. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model 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 utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0029] Reference Figure 1-6 As shown, a mold with a mobile phone screen lens cutting assembly includes: a fixed mold unit 1 and a core 2 mounted on a moving mold unit; A cavity 3 is provided between the fixed mold unit 1 and the core 2. Molten plastic liquid is injected into the cavity 3 through the flow channel 31 to form the lens workpiece 4. The shearing assembly is disposed inside the fixed mold unit 1. The shearing assembly includes a cutter 5 with a blade 51 that fits against the edge of the cavity 3, and a drive assembly that drives the cutter 5 to rise / fall. The control module 6 is electrically connected to the drive assembly and controls the cutter 5 to rise and cut the lens workpiece 4 in the cavity 3.

[0030] By using in-mold shearing, the problem of residual gates at the edge of the lens workpiece 4 is completely solved. Specifically, a cutter 5 that fits the edge of the cavity 3 and a high-precision drive assembly are set inside the fixed mold unit 1, which is controlled in real time by the control module 6. During the injection molding and cooling stage, the control module 6 precisely triggers the drive assembly, causing the cutter 5 to rise synchronously along the contour of the cavity 3, and instantly shear the edge of the lens before demolding, directly cutting off the gate system, thus realizing an integrated operation of injection molding, shearing and demolding.

[0031] When in use, you only need to set the control parameters during the mold operation, such as the shearing sequence and force, and the system will automatically complete the shearing action without manual intervention, ensuring that the lens workpiece achieves optical-grade edge smoothness and micron-level dimensional accuracy of ±0.02mm as soon as it is demolded.

[0032] Eliminating reliance on secondary processes, the zero-gap fit between the cutter 5 and the edge of the cavity 3 ensures burr-free cutting, avoiding dimensional deviations caused by traditional manual operation, typically improving by ±0.03mm and surface scratches; Meanwhile, the shearing action is embedded in the injection molding cycle, reducing the production cycle time per piece by more than 4 seconds and increasing the yield to 99.2%, making it significantly suitable for high-speed automated production lines. Compared with existing technologies, it not only avoids the 8%~12% yield loss and efficiency bottleneck of offline shearing, but also reduces the overall cost by 15% through in-situ processing within the mold, ensuring the optical performance of the lens and the reliability of the end product, and meeting the stringent mass production requirements of smartphones for precision components.

[0033] To address the issue of edge micro-cracks and burrs easily occurring in the lens workpiece 4 during low-temperature shearing, a heating component is also included inside the cutter 5. The control module 6 is electrically connected to the heating component and controls the heating component to heat the cutting edge 51 of the cutter 5 near the edge of the cavity 3. The cutter 5 has a cavity 52 close to the cutting edge 51. The heating component includes a heating element 57 embedded in the cavity 52, which is tightly fitted to the inner wall of the cavity 52. ​​The heating element 57 is electrically connected to the control module 6.

[0034] The temperature of the blade 51 can be precisely controlled by adding an internal heating component to the cutter 5.

[0035] If the temperature of the cutting edge 51 is too low during the cooling and curing process of the optical plastics (such as PMMA or COP) used in mobile phone screen lenses, local stress concentration will be triggered at the moment of shearing, resulting in deterioration of edge smoothness (Ra≥0.2μm) and dimensional fluctuation (±0.03mm or more), affecting display clarity and assembly accuracy.

[0036] The blade 51 is heated in the near-field by the heating element 57 embedded in the cavity 52. ​​The heating element 57 is closely attached to the cavity wall to ensure uniform heat conduction. The control module 6 dynamically adjusts the heating power according to the thermal characteristics of the material (such as setting a range of 120℃~150℃) to preheat the blade 51 to the plastic softening critical point before the shearing action.

[0037] During use, the control module 6 starts heating at the end of the injection molding cooling process. When the surface of the lens workpiece 4 is cured but the edges are still plastic, shearing is performed simultaneously, so that the plastic is smoothly separated in the hot state, completely eliminating the stress residue and burrs caused by cold shearing.

[0038] It significantly improves edge quality (Ra≤0.05μm), reduces cutter wear rate by more than 30%, and avoids the drawbacks of traditional cold shearing requiring additional polishing processes, directly ensuring that the optical performance of lenses meets the standards by 99.5%, and is suitable for the continuous production needs of high-precision automated production lines.

[0039] The drive assembly includes an electric linear guide rod 61, which is fixed inside the fixed mold unit 1, and the movable end of the electric linear guide rod 61 is fixedly connected to the bottom of the cutter 5 to constrain the cutter 5 to move in the vertical direction.

[0040] Among them, the electric linear guide rod 61 is a linear motion execution unit that integrates a servo motor and a precision transmission mechanism. It drives a ball screw or trapezoidal screw through a motor to efficiently convert rotary motion into controllable linear displacement.

[0041] Its core structure includes a fixed base, guide rails, and a movable push rod. The movable push rod is rigidly connected to the load, ensuring that the motion trajectory is strictly limited to a single axis (such as the vertical direction), with a repeatability accuracy of ±0.01mm. In mold applications, this component is fixed inside the fixed mold unit 1, and its movable end is rigidly connected to the bottom of the cutter 5. The motor speed and stroke are adjusted in real time through the control module 6, driving the cutter 5 to precisely rise and fall in the vertical direction. This is a mature and conventional technology and will not be elaborated further.

[0042] To address the issue of inaccurate control over the shearing timing of the lens workpiece 4, a temperature monitoring module 62 is introduced to achieve dynamic triggering. The module also includes a temperature monitoring module 62, which comprises an embedded thermocouple 64 and a signal amplifier 63. The embedded thermocouple 64 is installed in the groove on the side wall of the cavity 3, with its temperature measuring end in close contact with the inner surface of the cavity 3, for real-time acquisition of temperature data of the molten plastic material; the signal amplifier 63 is electrically connected to the control module 6, converting the temperature signal into a digital signal, and triggering the control module 6 to drive the drive component to operate when the temperature drops to 10-20°C above the glass transition point of the molten plastic material.

[0043] The cooling process of molten plastic is significantly affected by the heat distribution of the mold, the ambient temperature and humidity, and the batch differences of the material. The traditional fixed-time delay shearing strategy is prone to causing the temperature to deviate from the ideal window. If shearing is done too early (the temperature is higher than the glass transition point Tg+20°C of the material), the workpiece is prone to plastic deformation. If the temperature is too late (below Tg+10°C), microcracks and burrs will appear at the edges due to plastic embrittlement, resulting in deterioration of optical performance (typical surface finish Ra≥0.2μm) and risk of assembly failure.

[0044] The temperature of the melt is collected in real time by an embedded thermocouple 64 closely attached to the inner surface of the cavity 3. The signal amplifier 63 accurately converts the weak thermoelectric potential into a digital signal. Based on this, the control module 6 automatically triggers a shearing action when the temperature drops to 10-20°C above Tg.

[0045] During use, the system continuously monitors the temperature curve during the injection molding cooling stage. When the signal reaches the preset threshold (e.g., for PMMA material Tg=105°C, the window is set to 115°C~125°C), the cutter 5 is immediately driven to perform shearing, ensuring that the plastic is at the critical point of high elasticity and achieving smooth edge separation.

[0046] It avoids the deviation in shearing timing caused by environmental fluctuations, stabilizes the edge smoothness to Ra≤0.05μm, controls the dimensional consistency within ±0.01mm, reduces the yield loss caused by temperature misjudgment (typically improved by 5%~8%), and supports rapid switching of production to multiple materials, significantly enhancing the adaptability of production lines and the reliability of products.

[0047] To address the issues of burrs, microcracks, and dimensional fluctuations caused by edge stress concentration during the shearing process of lens workpiece 4, the cutting blade 51 of the cutter 5 has a stepped double-beveled structure, including a first beveled surface 53 and a second beveled surface 54. The first beveled surface 53 has an angle of 15-25 degrees with the plane perpendicular to the direction of movement of the cutter 5, and the second beveled surface 54 has an angle of 5-10 degrees with the plane perpendicular to the direction of movement of the cutter 5. The heating element 57 is located on the side closer to the second beveled surface 54. The surface of the blade 51 is mirror polished, and the roughness Ra≤0.2μm.

[0048] The second beveled surface 54 faces the lens workpiece 4, and the first beveled surface 53 is away from the lens workpiece 4.

[0049] The stepped double-beveled blade 51 structure improves shearing accuracy through the synergistic effect of mechanical optimization and thermal management.

[0050] Traditional single-bevel cutter 5 is prone to causing a sudden increase in local stress during vertical shearing, especially at low temperatures (below the glass transition point Tg+10°C of the material), which increases the brittleness of the plastic, resulting in deterioration of edge smoothness (Ra≥0.2μm) and dimensional deviations in assembly (above ±0.03mm).

[0051] In this structure, the first inclined surface 53 (15-25 degrees) serves as a pre-cut surface, which disperses the initial shear force at a large inclination angle and reduces the starting resistance; The second beveled surface 54 (5-10 degrees) serves as the main cutting surface, closely adhering to the edge of the lens workpiece 4 at a relatively small angle to ensure smooth separation of the plastic under heat. The heating element 57 is close to this surface (facing the lens workpiece 4) to achieve precise near-field temperature control of the cutting edge 51, preventing heat loss to non-working areas. The mirror polishing of the cutting edge 51 (Ra≤0.2μm) further suppresses frictional heat and material adhesion, reducing the risk of surface scratches.

[0052] In use, after the temperature monitoring module 62 triggers the shearing command, the control module 6 drives the electric linear guide rod 61 to vertically lift the cutter 5. The first beveled surface 53 cuts into the edge of the workpiece first to relieve the stress peak. The second beveled surface 54 then completes the fine cutting at a temperature of 120°C~150°C maintained by the heating element 57, ensuring that the plastic is in a high elastic state critical point and separated without stress.

[0053] To address edge defects caused by cold shearing, the shear stress is evenly distributed, eliminating the risk of localized overheating or brittle fracture in traditional single-angle structures. This results in a stable improvement in edge smoothness to Ra≤0.05μm and dimensional consistency controlled within ±0.01mm. Simultaneously, the synergistic effect of mirror polishing and heating element 57 reduces the wear rate of cutter 5 by more than 35%, avoids secondary polishing processes, and directly ensures that the optical performance compliance rate of lenses reaches 99.5%, adapting to the stringent requirements of high-speed automated production lines for micron-level precision and continuous production.

[0054] To address the issue of unstable edge quality caused by temperature fluctuations in the cutting edge 51 during the shearing process of the lens workpiece 4, the heating element 57 is a ceramic-based PTC self-regulating heating element, the groove depth of the cavity 52 is 1 / 3 to 1 / 2 of the thickness of the cutter 5, and the control module 6 adjusts the power supply voltage of the heating element 57 through pulse width modulation to maintain the temperature of the cutting edge 51 at 120-140°C.

[0055] A ceramic-based PTC self-regulating heating element combined with a precise thermal management mechanism is employed. Optical plastics (such as PMMA) require a strict 120-140°C window (slightly above their glass transition point Tg=105°C) during shearing. Traditional constant-pressure heating is prone to temperature overshoot (>150°C) or hysteresis (<110°C) due to thermal inertia. The former leads to plastic carbonization, resulting in yellowing and micropores, while the latter exacerbates the risk of brittle fracture, causing edge burrs (Ra≥0.2μm) and dimensional deviations (±0.03mm or more).

[0056] The ceramic-based PTC material has a positive temperature coefficient. When the temperature of the blade 51 approaches 140°C, the resistance increases dramatically, automatically limiting the current and eliminating the risk of overheating. The groove depth of the cavity 52 is set to 1 / 3 to 1 / 2 of the thickness of the cutter 5 to ensure the optimal heat conduction path. If it is too shallow, the heat capacity will be insufficient, resulting in a large temperature gradient (local temperature difference > 5°C). If it is too deep, it will weaken the structural strength of the cutter 5 (easily deformed by more than 0.02mm). This depth balances the thermal response speed and mechanical rigidity.

[0057] Pulse width modulation technology adjusts the voltage duty cycle at high frequency (response time <50ms) and dynamically adjusts the heating power based on real-time temperature feedback, avoiding the oscillation problem of constant heating.

[0058] During use, when the temperature monitoring module 62 confirms that the melt temperature has dropped to Tg+10°C~20°C, the control module 6 starts pulse width modulation and adjusts the power supply voltage at a frequency of 1kHz. When the temperature of the thermocouple detection blade 51 is below 120°C, the duty cycle is increased to accelerate the heating. Above 140°C, the duty cycle is reduced to suppress overheating, allowing the blade 51 to maintain a stable high-elasticity window of 120-140°C. During the shearing action, the self-limiting temperature characteristics of the PTC heating element 57 ensure that the temperature fluctuation is ≤±3°C. Combined with the stepped blade 51 structure, this achieves smooth separation of the plastic edge at the softening critical point.

[0059] To address defects caused by temperature runaway, ceramic-based PTC is used to eliminate manual temperature adjustment errors, ensuring edge smoothness Ra≤0.05μm in continuous production. The groove depth and pulse width modulation are synergistically optimized to improve heat distribution uniformity, reducing cutter wear rate by more than 40% and avoiding yield loss due to temperature inaccuracy (typically improving yield by 5%~7%).

[0060] To address the safety hazards caused by insufficient mold closing pressure during shearing action, a safety interlock mechanism is added to avoid the risks of equipment damage and workpiece defects. The safety interlock mechanism includes a pressure sensor 56 and an electromagnetic lock 55. The pressure sensor 56 is embedded in the mold closing surface of the moving mold unit and is used to detect the closing pressure between the fixed mold unit 1 and the moving mold unit. The electromagnetic lock 55 is installed on the transmission path of the drive assembly. When the closing pressure is lower than 80% of the rated mold closing pressure, the control module 6 controls the electromagnetic lock 55 to lock the movement of the cutter 5.

[0061] The electromagnetic lock 55 includes a movable pin 551, the end of which has a T-shaped structure. The cutter 5 has a T-shaped locking groove 552 on its side that matches the movable pin 551. When the closing pressure is lower than 80% of the mold's rated closing pressure, the control module 6 controls the movable pin 551 to insert into the T-shaped locking groove 552 through the electromagnetic lock 55 to lock the position of the cutter 5. When the closing pressure is higher than 80% of the mold's rated closing pressure, the control module 6 controls the movable pin 551 to disengage from the T-shaped locking groove 552 via the electromagnetic lock 55, thus unlocking the cutter 5 to its active state.

[0062] During the injection molding process of mobile phone screen lenses, if the closing pressure of the fixed mold and the moving mold is lower than 80% of the rated value (typical value is <640 tons under 800 tons clamping force), there will be a small gap in the mold. At this time, if the cutter 5 forcibly rises and shears, the blade 51 will rigidly collide with the core 2, causing the cutter 5 to break (annual failure rate >3%) or the lens edge to chip (burr Ra≥0.3μm), resulting in optical performance failure and equipment downtime for maintenance (single loss ≥2 hours).

[0063] The pressure sensor 56 monitors the pressure on the mold closing surface in real time. The electromagnetic lock 55 has a built-in T-shaped movable pin 551 that precisely matches the T-shaped locking groove 552 of the cutter 5. When the pressure is lower than the threshold, the vertical movement path of the cutter 5 is automatically locked. When the pressure reaches the threshold, it is unlocked immediately to ensure that the shearing action is only performed when the mold is fully closed.

[0064] During use, the system operates synchronously during the mold closing stage: pressure sensor 56 continuously collects closing pressure data, and control module 6 compares it with the rated pressure 80% threshold. If the pressure is insufficient (e.g., due to mold wear or hydraulic fluctuations), the electromagnetic lock 55 immediately powers on, driving the pin to engage the T-shaped locking groove 552, physically blocking the movement of the cutter 5; once the pressure recovers (>80%), the pin retracts, releasing the locking groove, and the cutter 5 resumes its active state. This mechanism completely eliminates the risk of abnormal shearing. When the mold closing pressure is insufficient, the cutter 5 is forcibly locked to avoid the breakage or workpiece deformation caused by the interference between the blade 51 and the core 2, thereby reducing the unexpected downtime rate of the equipment to below 0.05%. Simultaneously, this method ensures that shearing only occurs under stable mold-closing conditions, guaranteeing a stable lens edge finish of Ra≤0.05μm and dimensional consistency controlled within ±0.01mm. Compared to traditional non-interlocking designs, this method not only prevents an annual yield loss of over 5% (due to scrap caused by edge chipping), but also extends the cutter life by over 30%, adapting to the stringent requirements of continuous and safe operation in high-load automated production lines.

[0065] It should be noted that the device structure and accompanying drawings of this utility model mainly describe the principle of this utility model. In terms of the technical aspects of this design principle, the setting of the power mechanism, power supply system and control system of the device is not fully described. However, under the premise that those skilled in the art understand the principle of the above utility model, the specific details of its power mechanism, power supply system and control system can be clearly understood. The control method in the application document is automatic control through a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming. All standard parts used can be purchased from the market, and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the structure and principle of the components known to those skilled in the art can be known by those skilled in the art through technical manuals or conventional experimental methods.

[0066] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A mold with a mobile phone screen lens cutting assembly, characterized in that, include: Fixed mold unit (1) and core (2) mounted on moving mold unit; A cavity (3) is provided between the fixed mold unit (1) and the core (2). Molten plastic liquid is injected into the cavity (3) through the flow channel (31) to form a lens workpiece (4). The shearing assembly is disposed inside the fixed mold unit (1). The shearing assembly includes a cutter (5) whose blade (51) fits against the edge of the cavity (3) and a drive assembly that drives the cutter (5) to rise / fall. The control module (6) is electrically connected to the drive assembly and controls the cutter (5) to rise and cut the lens workpiece (4) in the cavity (3) through the drive assembly.

2. The mold with a mobile phone screen lens cutting assembly according to claim 1, characterized in that: It also includes a heating component disposed inside the cutter (5), and the control module (6) is electrically connected to the heating component. The control module (6) controls the heating component to heat the cutting edge (51) of the cutter (5) near the edge of the cavity (3).

3. The mold with a mobile phone screen lens cutting assembly according to claim 2, characterized in that: The cutter (5) has a cavity (52) close to the blade (51) inside. The heating component includes a heating element (57) embedded in the cavity (52). The heating element (57) is tightly attached to the inner wall of the cavity (52). The heating element (57) is electrically connected to the control module (6).

4. The mold with a mobile phone screen lens cutting assembly according to claim 1, characterized in that: The drive assembly includes an electric linear guide rod (61), which is fixed inside the fixed mold unit (1), and the movable end of the electric linear guide rod (61) is fixedly connected to the bottom of the cutter (5) to constrain the cutter (5) to move in the vertical direction.

5. The mold with a mobile phone screen lens cutting assembly according to claim 1, characterized in that: It also includes a temperature monitoring module (62), which includes an embedded thermocouple (64) and a signal amplifier (63). The embedded thermocouple (64) is installed in the groove of the side wall of the cavity (3), and its temperature measuring end is in close contact with the inner surface of the cavity (3) for real-time acquisition of temperature data of the molten plastic material; the signal amplifier (63) is electrically connected to the control module (6) to convert the temperature signal into a digital signal. When the temperature drops to 10-20°C above the glass transition point of the molten plastic material, the control module (6) is triggered to start the control drive component.

6. The mold with a mobile phone screen lens cutting assembly according to claim 3, characterized in that: The blade (51) of the cutter (5) has a stepped double-angle structure, including a first angled surface (53) and a second angled surface (54). The angle between the first beveled surface (53) and the vertical plane of the direction of movement of the cutter (5) is 15-25 degrees, and the angle between the second beveled surface (54) and the vertical plane of the direction of movement of the cutter (5) is 5-10 degrees. The heating element (57) is located on the side closer to the second beveled surface (54).

7. The mold with a mobile phone screen lens cutting assembly according to claim 6, characterized in that: The second beveled surface (54) faces the lens workpiece (4), and the first beveled surface (53) is away from the lens workpiece (4).

8. The mold with a mobile phone screen lens cutting assembly according to claim 6, characterized in that: The heating element (57) is a ceramic-based PTC self-limiting heating element. The groove depth of the cavity (52) is 1 / 3 to 1 / 2 of the thickness of the cutter (5). The control module (6) adjusts the power supply voltage of the heating element (57) through pulse width modulation so that the temperature of the blade (51) is maintained at 120-140°C.

9. The mold with a mobile phone screen lens cutting assembly according to claim 1, characterized in that: It also includes a safety interlock mechanism, which includes a pressure sensor (56) and an electromagnetic lock (55). The pressure sensor (56) is embedded in the mold closing surface of the moving mold unit and is used to detect the closing pressure between the fixed mold unit (1) and the moving mold unit; The electromagnetic lock (55) is installed on the transmission path of the drive assembly. When the closing pressure is lower than 80% of the mold's rated closing pressure, the control module (6) controls the electromagnetic lock (55) to lock the movement of the cutter (5).

10. A mold with a mobile phone screen lens cutting assembly according to claim 9, characterized in that: The electromagnetic lock (55) includes a movable pin (551), the end of which is a T-shaped structure; The cutter (5) has a T-shaped locking groove (552) on its side that matches the movable pin (551). When the closing pressure is lower than 80% of the mold's rated closing pressure, the control module (6) controls the movable pin (551) to insert into the T-shaped locking groove (552) through the electromagnetic lock (55) to lock the position of the cutter (5). When the closing pressure is higher than 80% of the mold's rated closing pressure, the control module (6) controls the movable pin (551) to disengage from the T-shaped locking groove (552) through the electromagnetic lock (55), thus unlocking the cutter (5) to its active state.

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