Forming die and forming method for high-precision ferrule product

Abstract

The application discloses a high-precision plug core product forming die and a forming method, and relates to the field of injection molding dies. In view of the MT plug core forming problem of an ultra-fine inner hole, a multi-section split die core structure is adopted, the cavity is divided into an upper forming block, a lower forming block and a sealing block, an ultra-fine hole forming needle and a hole forming rod of tungsten steel material are used to form the cable fine hole; the inner forming block and the sealing block are integrally formed by oil cutting, the tail end of the hole forming needle is axially and angularly fixed through a connecting device; a matching anti-shaking multi-slider mechanism is used to stably translate the sealing block through cooperation of an inclined rod and an inclined channel, and a spring is used to eliminate transmission clearance; integrated mold temperature automatic measurement, cavity pressure real-time sensing and exhaust sealing structure are used to realize closed-loop monitoring in the forming process. The application effectively avoids the breakage of the slender insert during processing and the injection deformation, improves the forming precision of the ultra-fine inner hole, and improves the product consistency and yield.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and in particular to a molding die and molding method for high-precision insert products. Background Technology

[0002] With the development of fiber optic communication technology, the MT ferrule, as the core component of a multi-core fiber optic connector, requires the internal molding of multiple extremely small-diameter optical cable mating holes, typically on the order of 0.125mm, with extremely stringent requirements for coaxiality, roundness, and positional accuracy. These ultra-fine inner holes present significant challenges during injection molding: the core used to mold the inner holes is extremely long and thin. When using an integral mold core structure, the core is prone to breakage during processing and is easily bent and deformed under the impact of high-pressure melt, leading to a loss of inner hole precision and hindering product manufacturing.

[0003] The present invention was developed to address this problem. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a high-precision ferrule product forming mold and forming method thereof, so as to solve the problems of easy damage to ultra-fine core, low inner hole forming accuracy and poor product consistency when forming ferrule products with ultra-fine inner holes using existing molds.

[0005] To solve the above technical problems, the solution adopted by the present invention is as follows: A molding die for a high-precision ferrule product, comprising a fixed mold assembly fixed on an injection molding machine and a movable mold assembly movably mounted on the injection molding machine. The fixed mold assembly and the movable mold assembly are provided with four guide devices for opening and closing the mold. An injection molding device is provided between the fixed mold assembly and the movable mold assembly. The fixed mold assembly includes a lower fixed plate, a connecting plate on the lower fixed plate, a lower template on the connecting plate, and a lower fixing groove formed on the lower template and the connecting plate. A lower mold core is detachably mounted in the lower fixing groove. The movable mold assembly includes an upper fixed plate, an upper template on the upper fixed plate, and an upper fixing groove formed on the upper template. The lower mold core includes a bearing block, which is detachably mounted in the lower fixing groove. The bearing block has a bearing channel, and a fixing block is mounted in the bearing channel via a fixing device. A lower molding block is mounted in the bearing channel. The lower molding block has a lower molding cavity with one end penetrating through its side for molding the core housing. The lower molding block is mounted on a fixed block. The upper mold core includes an upper module, which is detachably mounted in an upper fixed groove. The upper module has an L-shaped insertion channel at the position of the lower molding block. A matching upper molding block is provided in the insertion channel. The upper molding block has an upper molding cavity with one end penetrating through its side for molding the core housing. A sealing block is slidably provided in the bearing channel. When the mold is closed, the sealing block, the upper molding block, and the lower molding block resist each other to form a complete core housing injection molding cavity. The sealing block is also provided with an internal molding device for molding the inside of the core. Two hole-forming rods for molding the through holes at both ends of the internal molding device are fixedly provided on the sealing block. A sliding device is also provided in the bearing channel to drive the sealing block to slide, thereby completing the mold opening and closing.

[0006] A further improvement is that the internal forming device includes an internal forming block that matches the internal forming of the insert. The internal forming block is located on the end side of the sealing block. The internal forming block and the sealing block are integrally formed by oil cutting, thereby ensuring the accuracy of the internal forming block and the sealing block. The number of holes in the internal forming block that match the internal holes of the insert is provided by hole-forming needles made of tungsten steel. The other end of the hole-forming needles is located on the sealing block through a connecting device.

[0007] A further improvement is made to the connecting device, which includes a connecting block. The connecting block is equipped with a needle hole channel through which the number of hole-making needles are matched by oil cutting. The hole-making needles pass through the needle hole channel. A receiving slot is provided between the sealing block and the inner forming block. The connecting block is located in the receiving slot. A fixing channel is provided on the sealing block through oil cutting. A limiting block is provided in the fixing channel. The end of the hole-making needle is rectangular and resists the limiting block. The sealing block is provided with a processing clearance at the receiving slot position, so that the oil cutting of the receiving slot can better ensure the processing accuracy and thus better ensure the fitting accuracy.

[0008] A further improvement is made: the upper molding block includes a first molding block and a second molding block arranged in an L-shape to match the insertion channel. The upper end of the second molding block is L-shaped. The first molding block has a fitting channel to match the second molding block. The end of the second molding block is located in the fitting channel and is attached to the side of the first molding block. The upper molding cavity is located at the bottom of the first and second molding blocks. The first and second molding blocks are located in the insertion channel. The lower molding block includes a third molding block and a fourth molding block, which are detachably mounted on the fixing block. The lower forming cavity is located on the upper end surface of the third forming block. The fourth forming block has a forming channel for the forming rod to pass through. The fourth forming block also has a forming needle channel for the forming needle to pass through, which is formed by oil cutting. The fourth forming block has a clearance channel at the position of the forming needle channel and the clearance channel is connected to the forming needle channel, so that the processing depth can be shortened when the forming needle channel is oil cut, thereby ensuring better processing accuracy. An exhaust device is provided between the second forming block and the fourth forming block. The first forming block is provided with a pressure sensing device to sense the pressure during the injection molding of the core.

[0009] A further improvement is that the exhaust device has a horizontal exhaust channel on the second molding block and a vertical exhaust channel on the second molding block. The horizontal exhaust channel is connected to the vertical exhaust channel, and the vertical exhaust channel is also connected to the fitting channel, so that the gas enters from the vertical exhaust channel into the fitting channel and then enters the upper fixed groove for discharge. The pressure sensing device includes a pressure sensor rod, which is located in the first molding block and moves with the first molding block. The end of the pressure sensor rod can abut against the injection-molded insert shell to sense the pressure of the insert shell.

[0010] A further improvement is that the sealing block is equipped with an elastic gasket made of spring steel via bolts. When the mold is closed, the upper module resists the bolts on the elastic gasket, thereby buffering the impact force when the upper module closes the mold.

[0011] A further improvement is made to the sliding device, which includes a sliding block slidably disposed within the bearing channel. A sealing block is locked onto the sliding block and moves in conjunction with it. An inclined channel penetrating the sliding block is provided at the other end of the sliding block. A stop block is provided on the upper module. An inclined rod is fixedly provided on the stop block. The inclined rod passes through the inclined channel to drive the sliding block to slide. A first inclined surface is provided on the stop block. A second inclined surface is provided at the end of the sliding block. The first inclined surface and the second inclined surface resist each other.

[0012] A further improvement is that the sliding block has a receiving channel, and an elastic element is provided in the receiving channel. When the mold is closed, the elastic element abuts against the lower forming block.

[0013] A further improvement is made to the following: the bearing block includes a base plate precision-machined by a grinding machine and two positioning plates. Both the base plate and the positioning plates are provided with several heat dissipation grooves to prevent the blade from burning during precision grinding. The base plate is bolted to the inner wall of the lower fixing groove, and the positioning plates are symmetrically bolted to the base plate. The bearing channel is located between the positioning plates. The two ends of the positioning plates are also provided with clamping blocks to maintain the spacing of the bearing channel and thus ensure the accurate positioning of the lower forming block. The clamping blocks are located in the bearing channel and are bolted between the positioning plates.

[0014] A method for molding a high-precision ferrule product, using the above-mentioned molding die, includes the following steps: Step 1: Mold Preparation: Fix the fixed mold assembly onto the fixed platen of the injection molding machine, and fix the moving mold assembly onto the moving platen of the injection molding machine. Ensure the guide pillars and guide sleeves of the four guiding devices are aligned. Check and confirm that the lower mold core is securely installed in the lower fixed groove, the upper mold core is securely installed in the upper fixed groove, and the sealing block slides smoothly in the bearing channel. Connect the automatic temperature measuring device and pressure sensing device to the injection molding machine control system signals respectively. Step Two: Mold Closing Movement: The injection molding machine drives the moving mold assembly to move towards the fixed mold assembly along the guide device. The upper module descends with the moving mold assembly. The tilting rod on the abutment block enters the tilting channel of the sliding block first. As the moving mold assembly continues to descend, the tilting rod and the inclined surface of the tilting channel cooperate to convert the vertical movement of the moving mold assembly into the horizontal movement of the sliding block, pushing the sliding block to drive the sealing block to move smoothly along the bearing channel towards the cavity; Step 3: Buffering and Precise Positioning: When the mold closes near its final position, the elastic gasket on the sealing block first contacts the lower surface of the upper module. The elastic gasket undergoes elastic deformation to absorb the impact energy of the upper module's mold closing. Subsequently, the first inclined surface of the abutment block and the second inclined surface of the sliding block completely fit together to form a rigid mechanical limit, and the sealing block stops precisely at the forming position. At this time, the elastic element is compressed and its front end abuts against the lower forming block. Step Four: Cavity Closure: After the sealing block reaches the molding position, the inner molding block, the drilling pin, and the drilling rod at the front end of the sealing block enter the predetermined area of ​​the cavity. The front end of the drilling pin is inserted into the drilling channel of the fourth molding block, and the front end of the drilling rod is inserted into the drilling channel of the fourth molding block. At the same time, the lower surface of the upper molding block is in contact with the upper surface of the lower molding block, the upper molding cavity and the lower molding cavity are aligned, and the front end face of the sealing block and the side face of the inner molding block are precisely in contact with the rear end face of the upper molding block and the side end face of the lower molding block, forming a complete, sealed injection molding cavity for the insert shell. The drilling pin and the drilling rod extend out of the cavity; Step 5: Injection filling: The injection molding device injects molten plastic into a closed cavity under high pressure. During the melt filling process, air and volatile gases in the cavity are smoothly discharged to the outside of the mold through the horizontal venting channel, the vertical venting channel, the fitting channel, and the upper fixing groove. At the same time, the end of the pressure sensor rod is in contact with the melt injected into the cavity, measuring the melt pressure in the cavity in real time and transmitting the pressure signal to the injection molding machine control system. The automatic temperature measuring device measures the mold temperature in real time and transmits the temperature signal to the injection molding machine control system; Step Six: Holding pressure and cooling: After the cavity is filled, the injection molding machine enters the holding pressure stage. Based on the actual pressure signal from the pressure sensor, the machine's control system adjusts the holding pressure and duration in real time to compact the melt within the cavity. After holding pressure, the machine enters the cooling stage. Heat within the mold dissipates through the heat dissipation grooves on the support block and other mold components until the product cools, solidifies, and sets. Step Seven: Mold Opening and Core Pulling: After cooling, the injection molding machine drives the moving mold assembly to open the mold upwards along the guide device. The upper module drives the abutment block and tilting rod to rise together. The tilting rod acts in the opposite direction on the tilting channel, pulling the sliding block and causing the sealing block to retract along the bearing channel away from the cavity. The punching pin is smoothly pulled out from the punching channel of the fourth molding block, and the punching rod is smoothly pulled out from the punching channel of the fourth molding block. The inner molding device at the front end of the sealing block completely withdraws from the cavity area; Step Eight: Product ejection and demolding: After the moving mold assembly opens and rises to the preset position, the ejection mechanism of the injection molding machine moves to eject the molded core product from the lower molding cavity and demold, completing one injection molding cycle.

[0015] By adopting the aforementioned technical solution, the beneficial effects of the present invention are: 1. The multi-segment split mold core structure is adopted, which decomposes the cavity into an upper molding block, a lower molding block and a sealing block. The fine holes of the optical cable are formed by using replaceable tungsten steel ultrafine hole-forming needles and hole-forming rods. Each component can be processed and replaced independently, which effectively avoids the breakage and deformation of slender inserts during processing and high-pressure injection molding, and ensures the dimensional accuracy and shape accuracy of the ultrafine inner hole.

[0016] 2. The inner forming block and the sealing block are integrally formed by oil cutting, and the hole-forming needle is fixed in both the axial and angular directions through the connecting device, which reduces assembly errors and ensures the positional accuracy of the hole-forming needle.

[0017] 3. Equipped with a vibration-resistant multi-slider mechanism, the rigid drive of the tilting rod and tilting channel ensures the smooth translation of the sealing block, and the use of elastic elements to eliminate transmission gaps and resist micro-vibrations under high injection pressure, thereby achieving absolute positional stability of the internal molding device under high speed and high pressure, further ensuring the accuracy of optical cable docking. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the molding die structure for a high-precision ferrule product according to an embodiment of the present invention.

[0019] Figure 2 This is a partial exploded structural diagram of a molding die for a high-precision ferrule product according to an embodiment of the present invention.

[0020] Figure 3 This is a partial structural diagram of a molding die for a high-precision ferrule product according to an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the support block structure according to an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the mold core structure in an embodiment of the present invention.

[0023] Figure 6 This is an enlarged structural schematic diagram of section A in embodiment A of the present invention.

[0024] Figure 7 This is a schematic diagram of the upper and lower mold cores in an embodiment of the present invention.

[0025] Figure 8 This is an enlarged structural schematic diagram of section B in embodiment B of the present invention.

[0026] Figure 9 This is a schematic diagram of the internal molding device structure in an embodiment of the present invention.

[0027] Figure 10 This is an enlarged structural schematic diagram of section C in embodiment C of the present invention.

[0028] Figure 11 This is a schematic diagram of the exploded structure of the sealing block according to an embodiment of the present invention.

[0029] Figure 12 This is a cross-sectional structural diagram of a molding die for a high-precision ferrule product according to an embodiment of the present invention.

[0030] Figure 13 This is an enlarged structural schematic diagram of section D in embodiment D of the present invention. Detailed Implementation

[0031] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0032] Example 1: like Figure 1-13 As shown, this embodiment provides a high-precision ferrule molding die, specifically designed for injection molding MT ferrules with ultra-fine inner holes. The die mainly includes a fixed mold assembly, a moving mold assembly, a guiding device, an injection molding device, a lower mold core, an upper mold core, a sealing block 17 with an internal molding device, and a sliding device. The structure, working principle, and effects of each part are described in detail below.

[0033] I. Overall Frame of the Mold like Figure 1 and Figure 2 As shown, the overall frame of the mold consists of a fixed mold assembly, a moving mold assembly, a guiding device, and an injection molding device. The fixed mold assembly is fixedly installed on the fixed platen of the injection molding machine, while the moving mold assembly is movable relative to it on the moving platen of the injection molding machine. A guiding mechanism consisting of four guide pillars and guide sleeves passes between the two. An injection molding device, including a main runner bushing and a sub-runner system, is also located between the fixed mold assembly and the moving mold assembly to inject molten plastic into the mold cavity. Guided by four high-precision guide pillars and guide sleeves, the moving mold assembly is guided along a precise straight trajectory during each mold opening and closing movement, ensuring the parallelism and alignment accuracy between the moving and fixed molds. The injection molding device then distributes the plasticized molten plastic through the injection runner and sub-runners before injecting it into the cavity. This reduces cavity misalignment and flash caused by platen movement errors from the source, providing a reliable foundation for the precise alignment of subsequent multi-part mold cores.

[0034] The fixed mold assembly includes, from bottom to top, a lower fixing plate 1, a connecting plate 2, and a lower template 3. The lower fixing plate 1 is fixed to the fixed template of the injection molding machine, the connecting plate 2 is fixed to the lower fixing plate 1, and the lower template 3 is fixed to the connecting plate 2. A rectangular lower fixing groove is provided in the middle of the lower template 3, and a lower mold core is detachably installed in the lower fixing groove. The moving mold assembly includes an upper fixing plate 4, which is fixed to the moving template of the injection molding machine. An upper template 5 is provided on the upper fixing plate 4, and an upper fixing groove is provided on the side of the upper template 5 facing the fixed mold assembly. An upper mold core is detachably installed in the upper fixing groove.

[0035] II. Supporting Foundation Structure of the Lower Mold Core like Figures 3-8 As shown, the lower mold core is detachably fixed in the lower fixing groove, and its load-bearing base structure consists of a load-bearing block and a fixing block 181. The bearing block consists of a base plate 9 and two parallel positioning plates 101. Both the base plate 9 and the positioning plates 101 are precision-machined by a grinding machine, and multiple heat dissipation grooves are formed on their non-working surfaces. The base plate 9 is fixed to the bottom wall of the lower fixing groove by multiple bolts, and the two positioning plates 101 are symmetrically fixed to the upper surface of the base plate 9 by bolts, thereby forming a bearing channel extending along the mold opening direction between the two positioning plates 101. Clamping blocks 16 are also provided at both ends of the positioning plates 101. The clamping blocks 16 are placed in the bearing channel and fixed between the two positioning plates 101 by bolts. Among them, the precision grinding of the base plate 9 and the positioning plate 101 ensures the flatness and parallelism of the bottom plane of the bearing channel and the guide surfaces on both sides, providing a high-precision motion guide for the sliding parts. The heat dissipation strip groove can disperse grinding heat during grinding, preventing local overheating and burns on the workpiece surface. During injection molding, it increases the contact area between the bearing block and the air, accelerates heat dissipation, and helps the mold temperature to be evenly distributed. The clamping block 16 supports the two positioning plates 101 from the inside to both ends, actively maintaining the width spacing of the bearing channel, eliminating the slight relaxation that may be caused by vibration and thermal expansion and contraction if the bolts are simply tightened, and ensuring that the sliding parts always move smoothly in the precision guide space during long-term high-frequency mold opening and closing.

[0036] At the center of the bearing channel, the fixing block 181 is bolted to the base plate 9. The fixing block 181 serves as the mounting base for the subsequent lower molding block, providing a stable support platform for the cavity molding component. Its function is to accurately position and support the lower molding block at a predetermined height and position within the bearing channel, ensuring precise alignment between the lower molding cavity 185 and the upper molding cavity during mold closing, and also for the opening of the injection runner.

[0037] III. Sealing Block 17 and Internal Forming Device like Figure 7-11 As shown, before introducing the lower and upper forming blocks, the sealing block 17 and its internal forming device will be explained first, because they are the core components for forming ultra-fine internal holes, and the channels and mating structures of the subsequent forming blocks are designed around them.

[0038] A sealing block 17 is slidably disposed in the bearing channel. When the mold is closed, the sealing block 17 slides forward along the bearing channel to the cavity position, and together with the upper molding block and the lower molding block resists to form a complete core shell injection molding cavity. The sealing block 17 integrates two major molding elements: an internal molding device and a hole forming rod 171.

[0039] Specifically, the internal forming device is used to form multiple ultra-fine optical cable mating holes inside the ferrule. It includes an internal forming block 172, which is located on the front end of the sealing block 17 and is integrally formed with the sealing block 17 using an oil-cutting process. The internal forming block 172 has the same number of hole-forming pins 173 installed through it, according to the number of ultra-fine holes inside the ferrule. These hole-forming pins 173 are made of high-strength, high-hardness tungsten steel and can have a diameter as small as 0.1mm. Because the internal forming block 172 and the sealing block 17 are integrally formed using oil-cutting, there are no assembly gaps or installation errors between them. This ensures the positional accuracy and overall rigidity of the internal forming block 172 and the sealing block 17 from the manufacturing stage, avoiding positional deviations of the hole-forming pins 173 caused by separate assembly. The forming needle 173 is made of tungsten steel. Utilizing its high elastic modulus and high hardness, the ultra-fine core with a diameter of only 0.1mm still has sufficient bending strength and wear resistance. It will not bend or break under long-term repeated impact from high-pressure melt, providing material guarantee for the stable forming of high-precision ultra-fine inner holes. The rear end of the drilling needle 173 is fixed to the sealing block 17 via a connecting device, which specifically includes a connecting block 174. A receiving slot 177 is laterally formed at the junction of the sealing block 17 and the inner forming block 172. The connecting block 174 is embedded in the receiving slot 177. The connecting block 174 is also formed with a needle hole channel for each drilling needle 173 to pass through by oil cutting. A fixing channel 176 is formed on the sealing block 17 at the position corresponding to the rear of the connecting block 174 by oil cutting. A limiting block 175 is installed in the fixing channel 176. The tail end of each drilling needle 173 is formed into a rectangular cross section and abuts against the front end face of the limiting block 175. To ensure the machining accuracy when oil cutting the receiving slot, a machining clearance 178 is also formed on the sealing block 17 to improve the accuracy of oil cutting the receiving slot 177. The connecting block 174, embedded in the socket, provides intermediate support for the drilling needle 173. The rectangular cross-section at the tail end of the drilling needle 173 forms a surface contact with the front end face of the limiting block 175. On the one hand, the axial backward movement of the drilling needle 173 is restricted by the pressure of the limiting block 175; on the other hand, the non-circular structure of the rectangular cross-section effectively prevents the drilling needle 173 from rotating around its own axis, achieving complete axial and angular constraint on each ultra-fine drilling needle 173. The machining clearance 178 is designed to provide an unobstructed path for the oil cutting electrode, eliminating interference between the electrode and the workpiece. This allows the dimensions and geometric tolerances of the socket to be precisely machined, ensuring that the fit between the connecting block 174 and the socket reaches micron-level precision. From a manufacturing process perspective, this guarantees the positional consistency and repeatability accuracy of all drilling needles 173 after assembly.Specifically, the forming rod 171 is fixedly installed at the front end of the sealing block 17, on both sides of the inner forming device, and extends laterally. The forming rod 171 is used to form the through holes at both ends of the ferrule product. Its diameter and position are determined according to the product structure. It works in conjunction with the forming needle 173 to complete the forming of all the holes in the ferrule product. The forming rod 171 and the forming needle 173 together constitute a complete core system of the inner hole and through hole of the ferrule product.

[0040] IV. Structure of the lower molding block like Figure 6-11 As shown, the lower forming block is mounted on the fixed block 181 and is composed of a detachable third forming block 182 and a fourth forming block 18 side by side. The two are placed on the fixed block 181 and locked laterally by bolts.

[0041] The upper end face of the third molding block 182 has a lower molding cavity 185 extending through the side of the molding block. The lower molding cavity 185 is used to mold the lower half of the core housing contour. By dividing the lower molding block into the third molding block 182 and the fourth molding block 18, the machining of the lower molding cavity 185 can be performed on two smaller workpieces, reducing the overhang of the machining tool, increasing rigidity, and making it easier to achieve high surface finish and strict dimensional tolerances. When the lower molding cavity 185 of the third molding block 182 is partially worn or damaged, the third molding block 182 can be replaced separately while the fourth molding block 18 can be retained for continued use, reducing mold maintenance costs.

[0042] The fourth forming block 18 directly cooperates with the sealing block 17 and the internal forming device during mold closing, providing precise end guidance and support for the aforementioned hole-forming rod 171 and hole-forming needle 173. Specifically, the fourth forming block 18 has a hole-forming channel 183 for the hole-forming rod 171 to pass through, and a needle-forming channel 184 for the hole-forming needle 173 to pass through, which is also formed by oil cutting. To solve the problem of electrode wear and decreased processing accuracy caused by excessive depth of the ultra-fine needle-forming channel 184 during oil cutting, the fourth forming block 18 also has a clearance channel 186 at the position of the needle-forming channel 184, which is connected to the needle-forming channel 184. The setting of the clearance channel 186 structurally shortens the effective depth of oil cutting required for the needle-forming channel 184. After the oil cutting electrode travel distance is reduced, the end wear of the electrode and the uneven discharge on the side wall are significantly improved, so that the needle-forming channel 184 can obtain higher diameter accuracy and smoother hole wall surface quality. The high-precision needle channel 184 provides precise guidance and positioning for the insertion of the front end of the hole-forming needle 173, ensuring that the spatial position of the hole-forming needle 173 in the cavity is accurate.

[0043] During mold closing, the sealing block 17 slides forward into position along the bearing channel, and the two hole-forming rods 171 are respectively inserted into the hole-forming channels 183 of the fourth forming block 18, while the multiple hole-forming needles 173 are respectively inserted into the needle-forming channels 184 of the fourth forming block 18. The front ends of the hole-forming rods 171 and the hole-forming needles 173 are inserted into the hole-forming channels 183 and the needle-forming channels 184 respectively to obtain end support, which transforms the slender core, which was originally in a cantilever beam stress state, into a simply supported beam stress structure supported at both ends. Under the same cross-section and length conditions, the deflection of the simply supported beam structure is reduced by several times compared to the cantilever beam structure. Therefore, the bending resistance of the hole-forming rods 171 and the hole-forming needles 173 under high-pressure melt impact is greatly improved, and they are not prone to bending deformation, thus effectively ensuring the straightness and diameter accuracy of the ultra-fine inner hole.

[0044] V. Structure of the upper forming block like Figure 6-13 As shown, the upper mold core includes an upper module 6, which is detachably installed in the upper fixing groove and locked with bolts. The upper module 6 has an L-shaped socket channel extending along the mold closing direction at the position corresponding to the lower forming block. The upper forming block with a matching shape is installed in the socket channel.

[0045] Specifically, the upper molding block is assembled from a first molding block 10 and a second molding block 11. The upper end of the second molding block 11 is L-shaped. The first molding block 10 has a fitting channel that mates with the bent portion of the second molding block 11. The end of the second molding block 11 is inserted into the fitting channel and fits tightly against the side of the first molding block 10, forming an overall L-shaped outline. Then, they are inserted into the socket channel and locked together. The bottom of the first molding block 10 and the second molding block 11 both have an upper molding cavity with one end penetrating the side, used to form the upper half of the core housing outline. The L-shaped design of the socket channel allows the upper molding block to be inserted from above along the L-shaped path. The right-angled bend of the L-shape automatically forms positioning constraints in both vertical and lateral directions with the wall of the socket channel of the upper module 6, eliminating the need for additional adjustment and alignment processes. This results in high assembly accuracy and quick assembly / disassembly. The upper molding block adopts a split splicing structure of the first molding block 10 and the second molding block 11. On the one hand, it is convenient to perform fine processing of the upper molding cavity in sections. On the other hand, the fitting channel forms a cavity inside the first molding block 10. This cavity is connected to the subsequent exhaust channel, providing a flow path for the exhaust of gas from the cavity, thus realizing the integrated design of structure and function.

[0046] VI. Cavity Formation and Fitting Relationship During Mold Closure During mold closing, the sealing block 17 slides forward along the bearing channel to a predetermined position. At this time, all components are precisely aligned. The inner forming block 172, the hole-forming pin 173, and the hole-forming rod 171 at the front end of the sealing block 17 enter the cavity area. The front end of the hole-forming pin 173 is inserted into the needle-forming channel 184 of the fourth forming block 18, and the front end of the hole-forming rod 171 is inserted into the hole-forming channel 183 of the fourth forming block 18. The front end face of the sealing block 17, the side face of the inner forming block 172, and the rear end face of the upper forming block and the side end face of the lower forming block precisely abut against each other. The upper forming cavity and the lower forming cavity 185 are aligned to form a complete core housing injection molding cavity. The hole-forming pin 173 and the hole-forming rod 171 extend out of the cavity to form ultra-fine inner holes and end through holes. This multi-segment split mold core structure decomposes the originally complex integral cavity containing multiple ultra-fine cores into three independent parts: an upper forming block, a lower forming block, and a sealing block 17. Each part can be individually machined and surface-treated with high precision. This fundamentally avoids the machining problems that are prone to occur when directly drilling or EDM machining ultra-fine deep holes on an integral mold core, such as tool breakage, tool deflection, and electrode short circuits. The three parts are precision-machined to ensure the flatness and positional tolerance of the mating surfaces. When the mold is closed, the cavity is sealed by the precise contact of the mating surfaces, without the need for additional sealing elements. When the ultra-fine hole-forming needles 173 wear out after long-term use, the accuracy can be restored simply by disassembling the connecting device on the sealing block 17 and replacing one or more hole-forming needles 173, without scrapping the entire mold core. This method is efficient, cost-effective, and can maintain the forming accuracy of ultra-fine inner holes for a long time.

[0047] VII. Sliding Device like Figure 6 and 12As shown in Figure 13, a sliding device is provided to enable the sealing block 17 to slide smoothly along the bearing channel and accurately enter and exit the molding position. The sliding device includes a sliding block 14 and a stop block 12. The sliding block 14 is slidably fitted in the bearing channel and located behind the sealing block 17. The sealing block 17 is bolted to the front end face of the sliding block 14 and moves with it. An inclined channel penetrating its body is opened at the rear end of the sliding block 14. The inclined channel is at a certain angle relative to the mold opening direction. The stop block 12 is fixedly installed at the bottom of the upper module 6. The lower end face of the stop block 12 is provided with a first inclined surface. The upper end face of the sliding block 14 is provided with a matching second inclined surface. In addition, an inclined rod 20 is fixed on the stop block 12. The axis of the inclined rod 20 is parallel or collinear with the axis of the inclined channel and moves through the inclined channel. When the moving mold assembly closes downwards, the upper module 6 drives the abutment block 12 and the tilting rod 20 to descend. The tilting rod 20 slides along the tilted channel, converting the vertical motion into horizontal motion through the inclined surface. This pushes the sliding block 14, along with the sealing block 17, to move horizontally towards the cavity along the bearing channel until the first and second tilted surfaces are fully engaged. When the mold opens, the moving mold assembly rises, and the tilting rod 20 pulls the sliding block 14 backwards in the opposite direction, causing the sealing block 17 to retract, thus completing the core pulling. By utilizing the wedge drive mechanism composed of the tilting rod 20 and the tilted channel, the vertical linear motion of the injection molding machine's mold opening and closing is precisely converted into the horizontal translational motion of the sealing block 17. The motion conversion relationship is uniquely determined by the tilt angle, and the motion transmission chain involves only three parts: the abutment block 12, the tilting rod 20, and the sliding block 14. This results in high transmission rigidity and no response delay. The rigid contact between the first and second inclined surfaces at the mold closing endpoint provides a rigid mechanical limit for the sliding block 14, ensuring that the sealing block 17 does not overshoot or retreat axially after the mold is closed, thus achieving micron-level repeatability in the position of the internal forming device within the cavity. During mold opening, the inclined rod 20 pulls the sliding block 14 in the opposite direction, forcing the sealing block 17 to exit synchronously, achieving reliable core pulling of the hole-forming pin 173 and the hole-forming rod 171, avoiding the jamming and incomplete reset problems that may occur with traditional spring reset mechanisms.

[0048] 8. Anti-vibration elastic clamping and mold closing buffer like Figure 6 and 12 As shown in Figure 13, to further eliminate transmission gaps and resist micro-vibrations under high injection pressure, a receiving channel is also provided inside the sliding block 14, and a spring 141 is placed inside the receiving channel. After the mold is closed, the front end face of the spring 141 abuts against the side of the third molding block 182 of the lower molding block, generating a buffer force, thereby preventing the sliding block 14 from easily damaging the third molding block 182 when it is in contact with it, thus protecting the third molding block 182. At the same time, it can release the elastic force during demolding, assisting the sliding block 14 to slide backward, thereby completing the demolding better.

[0049] To buffer the impact at the end of the mold closing stroke, an elastic gasket 13 made of spring steel sheet is bolted to the sealing block 17. When the upper module 6 descends rapidly with the moving mold assembly, the lower surface of the upper module 6 will first contact the bolt head on the elastic gasket 13. The elastic gasket 13 will undergo elastic deformation to absorb kinetic energy, preventing the rigid upper module 6 from directly impacting the sealing block 17. At the end of the mold closing stroke, the kinetic energy of the upper module 6 is not instantaneously transferred to the sealing block 17, but first acts on the elastic gasket 13, causing it to undergo elastic bending deformation, converting the kinetic energy into elastic potential energy, thereby prolonging the impact force action time and reducing the peak impact force. The spring steel sheet has a high elastic limit and excellent fatigue life, and can maintain stable buffering performance in hundreds of thousands of mold closing cycles, effectively protecting the precision hole-forming pin 173, the inner forming block 172, and the end face of the sealing block 17 from impact damage, and extending the service life of the ultra-fine core.

[0050] IX. Process Monitoring and Exhaust System To achieve transparency and closed-loop control of the molding process, the mold integrates an venting device, a pressure sensing device, and a mold temperature monitoring device.

[0051] like Figure 8 As shown, the venting device is located in the mating area between the second molding block 11 and the fourth molding block 18. Specifically, a horizontal venting channel 113 is machined laterally on the parting surface of the second molding block 11, and a vertical venting channel 112 is machined longitudinally. The horizontal venting channel 113 communicates with the edge of the cavity and is connected to the vertical venting channel 112. The vertical venting channel 112 extends upward and communicates with the fitting channel on the first molding block 10. Finally, the gas enters the fitting channel from the vertical venting channel 112 and then enters the upper fixing groove to exit the mold. The precisely controlled micro-gap between the parting surfaces of the molding blocks constitutes the venting channel. This gap is much smaller than the overflow value of common engineering plastic melts. Therefore, the air in the cavity and the volatile gases generated by the plastic melt can be smoothly discharged through the gap. However, the melt itself cannot enter such a small gap due to viscosity and surface tension, thus achieving automatic sealing while ensuring smooth venting. The horizontal exhaust channel 113, the vertical exhaust channel 112, and the interlocking channel are connected to form a tortuous gas flow path, which further increases the resistance to the entry of the melt and ensures that the exhaust channel will not be blocked by the melt during continuous production. Smooth exhaust effectively prevents defects such as product scorching, short shots, and bubbles caused by trapped gas, and significantly improves the appearance quality and internal density of the product.

[0052] like Figure 6As shown, the pressure sensing device includes a pressure sensor rod 19, which is disposed inside the first molding block 10 and moves with the first molding block 10. Its end can abut against the injection-molded core shell, thereby accurately measuring the melt pressure in the cavity in real time and transmitting the signal to the injection molding machine control system.

[0053] The sensing end face of the pressure sensor rod 19 directly contacts the surface of the product being molded inside the cavity, enabling real-time acquisition of cavity pressure change curves at each stage from filling, compaction to holding pressure. This pressure data directly reflects the actual state of the melt within the cavity. After receiving the pressure feedback signal, the injection molding machine control system can adjust key process parameters such as injection speed, holding pressure switching point, and holding pressure in real time, achieving closed-loop adaptive control of the molding process. This significantly improves the repeatability of product weight and dimensions per mold, ensuring consistency across different molds in mass production.

[0054] like Figure 3 and Figure 4 Regarding mold temperature monitoring, automatic temperature measuring devices are embedded at both ends of the positioning plate 101 near the injection molding device. These automatic temperature measuring devices are thermocouple temperature sensors 8, and the measured mold temperature signals can be connected to the temperature control system. Simultaneously, a temperature measuring ring 81 is machined in the same area of ​​the positioning plate 101, serving as a measurement point for a manual temperature measuring instrument, used to periodically verify the accuracy of the automatic temperature measuring device. The thermocouple temperature sensor 8 utilizes the principle of thermoelectric potential generated when two different metals change temperature to continuously measure the mold temperature in real time. The temperature control system adjusts the flow rate of the heating or cooling medium in the mold based on the feedback signal, ensuring that the mold temperature remains within the set process range, avoiding defects such as warping, shrinkage cavities, and dimensional deviations caused by uneven cooling rates due to mold temperature fluctuations. The temperature measuring ring 81 is a standardized manual temperature measuring point. Operators can use a handheld temperature measuring instrument to periodically measure the temperature at this point and compare it with the readings of the automatic temperature measuring device to ensure that the automatic temperature measuring device has not drifted or failed during long-term operation. Together, these two components form an accurate and reliable mold temperature monitoring system.

[0055] 10. Overall working process of the mold The injection molding machine drives the moving mold assembly to move along the guide device towards the fixed mold assembly for mold closing. The upper module 6 descends, and the tilting rod 20 first inserts into the tilting channel of the sliding block 14, driving the sliding block 14 to smoothly move the sealing block 17 towards the cavity. When the mold is about to close, the elastic gasket 13 contacts the upper module 6 for buffering, and then the first tilting surface and the second tilting surface fully abut, and the sealing block 17 stops precisely at the molding position. At this time, the inner molding block 172, the hole-forming pin 173, and the hole-forming rod 171 at the front end of the sealing block 17 enter the predetermined position of the cavity. The front end of the hole-forming pin 173 inserts into the needle-forming channel 184 of the fourth molding block 18, and the front end of the hole-forming rod 171 inserts into the hole-forming channel 183 of the fourth molding block 18. The lower surface of the upper molding block fits against the upper surface of the lower molding block, forming a complete core housing injection molding cavity. The spring 141 is compressed and presses against the lower molding block, eliminating all gaps. The injection molding unit injects molten plastic into the mold cavity under high pressure. During the filling process, the gas in the cavity is smoothly discharged through the horizontal venting channel 113, the vertical venting channel 112, and the fitting channel. The pressure sensor rod 19 provides real-time feedback on the cavity pressure, and the automatic temperature measuring device monitors the mold temperature. After pressure holding and cooling, the moving mold assembly opens and rises. The tilting rod 20 drives the sliding block 14 and the sealing block 17 to retract, and the hole-forming pin 173 and the hole-forming rod 171 are smoothly pulled out of the product. Then, the ejection mechanism of the injection molding machine ejects the formed insert and demolds it. When the product specifications are changed or the ultra-fine inserts are worn, the lower molding block, upper molding block, hole-forming pin 173, etc., can be quickly disassembled and replaced without replacing the entire mold core.

[0056] Example 2: refer to Figure 1-13 This embodiment provides a method for molding a high-precision ferrule product. The method uses the molding die for the high-precision ferrule product described in the above embodiment, specifically designed for molding MT ferrule products with ultra-fine inner holes, and includes the following steps: Step 1: Mold preparation; The fixed mold assembly is fixedly installed on the fixed platen of the injection molding machine, and the moving mold assembly is fixedly installed on the moving platen of the injection molding machine. The guide posts and guide sleeves of the four guiding devices are aligned and ensure smooth, unobstructed sliding. Check and confirm that the lower mold core is securely installed in the lower fixed groove, the upper mold core is securely installed in the upper fixed groove, and the sealing block 17 can slide freely within the bearing channel without shaking. Connect the thermocouple signal line of the automatic temperature measuring device and the pressure sensor signal line of the pressure sensing device to the corresponding interfaces of the injection molding machine control system, and set the process parameters such as mold temperature, injection pressure, injection speed, and holding time on the control system.

[0057] Step 2: Mold closing motion; The injection molding machine drives the moving mold assembly to move towards the fixed mold assembly along the guide device, and the upper module 6 descends together with the moving mold assembly. During the descent, the inclined rod 20 fixedly installed on the abutment block 12 first enters the inclined channel opened at the rear end of the sliding block 14. As the moving mold assembly continues to descend, a wedge effect is generated between the outer cylindrical surface of the inclined rod 20 and the inner wall surface of the inclined channel, converting the vertical linear motion of the moving mold assembly into the horizontal linear motion of the sliding block 14 along the bearing channel, pushing the sliding block 14 to drive the sealing block 17 to move smoothly towards the cavity.

[0058] Step 3: Buffering and Precise Positioning; As the mold closing stroke nears its end, the elastic gasket 13 mounted on the sealing block 17 first contacts the lower surface of the upper module 6. Upon contact with the upper module 6, the elastic gasket 13 undergoes elastic bending deformation, converting the impact kinetic energy of the upper module 6 into the elastic potential energy of the elastic gasket 13, thereby significantly prolonging the impact time and reducing the peak impact force. As the moving mold assembly continues to descend to the mold closing end point, the first inclined surface of the lower end face of the abutment block 12 completely engages with the second inclined surface of the upper end face of the sliding block 14, forming a rigid mechanical limit, and the sealing block 17 precisely stops at the predetermined molding position. Simultaneously, the spring 141 installed in the receiving channel of the sliding block 14 is compressed, and its front end face abuts against the side of the lower molding block.

[0059] Step 4: Cavity closure; After the sealing block 17 reaches the molding position precisely, the molding components complete the final alignment: the inner molding block 172, the drilling needle 173, and the drilling rod 171 enter the predetermined area of ​​the cavity, wherein the front ends of multiple drilling needles 173 are respectively inserted into the drilling needle channels 184 processed by oil cutting on the fourth molding block 18, and the front ends of two drilling rods 171 are respectively inserted into the drilling channels 183 on the fourth molding block 18; at the same time, the upper module 6 drives the upper molding block to descend into place, the lower surface of the upper molding block is in contact with the upper surface of the lower molding block, and the upper molding cavity and the lower molding cavity 185 are aligned to form the main cavity outline of the insert shell; the front end face of the sealing block 17 and the side face of the inner molding block 172 are precisely abutted with the rear end face of the upper molding block and the side end face of the lower molding block, finally forming a complete, closed insert shell injection molding cavity. The hole-forming needle 173 and the hole-forming rod 171 extend out of the closed cavity, occupying the space required for the internal hole system of the product.

[0060] Step 5: Injection molding filling; The injection molding unit injects the plasticized molten plastic into the closed cavity under high pressure. As the melt gradually fills the cavity from the gate to the end, the air already in the cavity and the volatile gases generated at the melt front due to high temperature are driven to the end of the cavity. These gases then pass sequentially through the horizontal venting channel 113, the vertical venting channel 112 on the parting surface of the second molding block 11, and the fitting channel on the first molding block 10, finally exiting the mold through the upper fixing groove. During the filling process, the sensing end face of the pressure sensor rod 19 installed in the first molding block 10 directly contacts the melt front and subsequent melt flow into the cavity, measuring the actual pressure of the melt in the cavity in real time and transmitting the pressure signal to the injection molding machine control system in the form of an electrical signal. Simultaneously, the automatic temperature measuring device embedded in the positioning plate 101 measures the mold temperature in real time and transmits the temperature signal to the injection molding machine control system.

[0061] Step Six: Pressure Holding and Cooling; After the cavity is completely filled with melt, the molding machine enters the holding pressure stage. The injection molding machine control system receives the cavity pressure signal from the pressure sensor rod 19 in real time, compares the actual pressure with the preset ideal pressure curve, and performs compressive shrinkage of the melt in the cavity to compensate for the volume reduction caused by the cooling contraction. After the holding pressure is completed, the cooling stage begins, and the heat of the melt in the mold is dissipated through water cooling until the product temperature drops below the heat distortion temperature, completing the cooling, solidification, and shaping.

[0062] Step 7: Mold opening and core pulling; After cooling and solidification, the injection molding machine drives the moving mold assembly to move upward along the guide device to open the mold. The upper module 6 rises together with the moving mold assembly, and the abutment block 12 and tilting rod 20 also rise accordingly. At this time, the sliding block 14 moves horizontally backward along the bearing channel away from the cavity, pulling the sliding block 14 to drive the sealing block 17 backward. During the backward movement of the sealing block 17, multiple hole-forming needles 173 are smoothly pulled out from the needle-forming channel 184 of the fourth molding block 18, and two hole-forming rods 171 are smoothly pulled out from the hole-forming channel 183 of the fourth molding block 18. The inner molding device at the front end of the sealing block 17 completely withdraws from the cavity area, completing the core-pulling action.

[0063] Step 8: Eject and demold the product; After the moving mold assembly opens and rises to the preset fully open position, the ejector mechanism of the injection molding machine activates. The ejector pin and ejector plate smoothly eject the molded and cooled core product from the lower molding cavity 185, completing one full injection molding cycle. After the product is removed, the mold can proceed to step two of the next cycle for continuous batch production.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions above are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A molding die for a high-precision ferrule product, comprising a fixed mold assembly fixedly mounted on an injection molding machine and a movable mold assembly movably mounted on the injection molding machine, wherein the fixed mold assembly and the movable mold assembly are provided with four guide devices for opening and closing the mold, an injection molding device is provided between the fixed mold assembly and the movable mold assembly, the fixed mold assembly includes a lower fixed plate, a connecting plate is provided on the lower fixed plate, a lower template is provided on the connecting plate, a lower fixing groove is formed on the lower template and the connecting plate, and a lower mold core is detachably mounted in the lower fixing groove, the movable mold assembly includes an upper fixed plate, an upper template is provided on the upper fixed plate, an upper fixing groove is formed on the upper template, and an upper mold core is mounted in the upper fixing groove, characterized in that: The lower mold core includes a support block, which is detachably mounted in a lower fixed groove. The support block has a support channel, and a fixed block is mounted within the support channel via a fixing device. A lower forming block is located within the support channel, and the lower forming block has a lower forming cavity with one end penetrating its side for forming the insert shell. The lower forming block is mounted on the fixed block. The upper mold core includes an upper module, which is detachably mounted in an upper fixed groove. The upper module has an L-shaped insertion channel located at the position of the lower forming block, and a matching upper forming block is located within the insertion channel. The upper forming block has an upper forming cavity with one end penetrating its side for forming the insert shell. A sealing block slides within the support channel. When the mold is closed, the sealing block, upper forming block, and lower forming block resist each other to form a complete insert shell injection molding cavity. The sealing block also has an internal forming device for forming the insert's interior. Two forming rods for forming the through holes at both ends of the internal forming device are fixedly mounted on the sealing block at both ends of the internal forming device. The support channel also has a device for driving the sealing block. The sliding device, which completes mold opening and closing, includes an inner forming block that matches the internal forming of the insert. The inner forming block is located on the end side of the sealing block. The inner forming block and the sealing block are integrally formed by oil cutting to ensure the accuracy of the inner forming block and the sealing block. The number of holes in the inner forming block that match the number of holes in the insert is provided by hole-forming pins made of tungsten steel. The other end of the hole-forming pin is located on the sealing block through a connecting device. The connecting device includes a connecting block. The connecting block is provided with pinhole channels that match the number of hole-forming pins by oil cutting. The hole-forming pins pass through the pinhole channels. A socket is provided between the sealing block and the inner forming block. The connecting block is located in the socket. A fixed channel is provided on the sealing block by oil cutting. A limiting block is provided in the fixed channel. The end of the hole-forming pin is rectangular and resists the limiting block. The sealing block has a processing clearance at the socket position to ensure the processing accuracy of the oil-cut socket and thus better ensure the fitting accuracy.

2. The molding die for a high-precision ferrule product according to claim 1, characterized in that: The upper molding block includes a first molding block and a second molding block arranged in an L-shape with a matching socket channel. The upper end of the second molding block is L-shaped. A fitting channel is provided on the first molding block to match the second molding block. The end of the second molding block is located within the fitting channel and is attached to the side of the first molding block. The upper molding cavity is located at the bottom of the first and second molding blocks. The first and second molding blocks are located within the socket channel. The lower molding block includes a third molding block and a fourth molding block. The third and fourth molding blocks are detachably mounted on a fixed block. The lower forming cavity is located on the upper surface of the third forming block. The fourth forming block has a forming channel for the forming rod to pass through. The fourth forming block also has a forming needle channel for the forming needle to pass through, which is formed by oil cutting. The fourth forming block has a clearance channel at the position of the forming needle channel, and the clearance channel is connected to the forming needle channel. This allows the processing depth to be shortened during oil cutting of the forming needle channel, thereby ensuring better processing accuracy. An exhaust device is provided between the second forming block and the fourth forming block. The first forming block is provided with a pressure sensing device to sense the pressure during the injection molding of the insert.

3. The molding die for a high-precision ferrule product according to claim 2, characterized in that: The exhaust device has a horizontal exhaust channel on the second molding block and a vertical exhaust channel on the second molding block. The horizontal exhaust channel is connected to the vertical exhaust channel, and the vertical exhaust channel is also connected to the fitting channel, so that the gas enters from the vertical exhaust channel into the fitting channel and then enters the upper fixed groove for discharge. The pressure sensing device includes a pressure sensor rod, which is located in the first molding block and moves with the first molding block. The end of the pressure sensor rod can abut against the injection-molded insert shell to sense the pressure of the insert shell.

4. The molding die for a high-precision ferrule product according to claim 1, characterized in that: The sealing block is equipped with an elastic gasket made of spring steel via bolts. When the mold is closed, the upper module resists the bolts on the elastic gasket, thereby buffering the impact force when the upper module closes the mold.

5. The molding die for a high-precision ferrule product according to claim 1, characterized in that: The sliding device includes a sliding block, which is slidably disposed within the bearing channel. A sealing block is locked onto the sliding block and moves in conjunction with it. An inclined channel penetrating the sliding block is provided at the other end of the sliding block. A stop block is provided on the upper module. An inclined rod is fixedly provided on the stop block. The inclined rod passes through the inclined channel to drive the sliding block to slide. A first inclined surface is provided on the stop block. A second inclined surface is provided at the end of the sliding block. The first inclined surface and the second inclined surface resist each other.

6. The molding die for a high-precision ferrule product according to claim 5, characterized in that: The sliding block has a receiving channel, and an elastic element is provided in the receiving channel. When the mold is closed, the elastic element abuts against the lower forming block.

7. The molding die for a high-precision ferrule product according to claim 6, characterized in that: The bearing block includes a base plate precision-machined by a grinding machine and two positioning plates. Both the base plate and the positioning plates are provided with several heat dissipation grooves to prevent the blade from burning during precision grinding. The base plate is bolted to the inner wall of the lower fixing groove, and the positioning plates are symmetrically bolted to the base plate. The bearing channel is located between the positioning plates. The two ends of the positioning plates are also provided with clamping blocks to maintain the distance between the bearing channels and thus ensure the accurate positioning of the lower forming block. The clamping blocks are located in the bearing channel and are bolted between the positioning plates.

8. A method for molding a high-precision ferrule product, using a molding die for a high-precision ferrule product as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Step 1: Mold preparation: Fix the fixed mold assembly on the fixed platen of the injection molding machine, fix the moving mold assembly on the moving platen of the injection molding machine, align the guide pillars and guide sleeves of the four guide devices, check and confirm that the lower mold core is firmly installed in the lower fixed groove, the upper mold core is firmly installed in the upper fixed groove, and the sealing block slides smoothly in the bearing channel. Connect the automatic temperature measuring device and pressure sensing device to the injection molding machine control system signals respectively. Step Two: Mold closing motion: The injection molding machine drives the moving mold assembly to move towards the fixed mold assembly along the guide device. The upper module descends with the moving mold assembly. The tilting rod on the abutment block enters the tilting channel of the sliding block first. As the moving mold assembly continues to descend, the tilting rod and the inclined surface of the tilting channel cooperate to convert the vertical motion of the moving mold assembly into the horizontal motion of the sliding block, pushing the sliding block to drive the sealing block to move smoothly along the bearing channel towards the cavity. Step 3: Buffering and precise positioning: When the mold closes to the position, the elastic gasket on the sealing block first contacts the lower surface of the upper module. The elastic gasket undergoes elastic deformation to absorb the impact energy of the upper module closing. Then, the first inclined surface of the abutment block and the second inclined surface of the sliding block are fully engaged to form a rigid mechanical limit. The sealing block stops precisely at the forming position. At this time, the elastic element is compressed and its front end abuts against the lower forming block. Step Four: Cavity Closure: After the sealing block reaches the molding position, the inner molding block, the hole-forming needle, and the hole-forming rod at the front end of the sealing block enter the predetermined area of ​​the cavity. The front end of the hole-forming needle is inserted into the needle-forming channel of the fourth molding block, and the front end of the hole-forming rod is inserted into the hole-forming channel of the fourth molding block. At the same time, the lower surface of the upper molding block is in contact with the upper surface of the lower molding block, the upper molding cavity and the lower molding cavity are aligned, and the front end face of the sealing block and the side side of the inner molding block are precisely in contact with the rear end face of the upper molding block and the side end face of the lower molding block, forming a complete, closed core shell injection molding cavity. The hole-forming needle and the hole-forming rod are suspended in the cavity. Step 5: Injection filling: The injection molding device injects molten plastic into a closed cavity under high pressure. During the melt filling process, air and volatile gases in the cavity are smoothly discharged to the outside of the mold through the horizontal venting channel, the vertical venting channel, the fitting channel, and the upper fixing groove. At the same time, the end of the pressure sensor rod is in contact with the melt injected into the cavity, measuring the melt pressure in the cavity in real time and transmitting the pressure signal to the injection molding machine control system. The automatic temperature measuring device measures the mold temperature in real time and transmits the temperature signal to the injection molding machine control system; Step Six: Holding pressure and cooling: After the cavity is filled, the holding pressure stage begins. The injection molding machine control system adjusts the holding pressure and holding time in real time according to the actual pressure signal fed back by the pressure sensor rod to compress and shrink the melt in the cavity. After the holding pressure is completed, the cooling stage begins. The heat in the mold is dissipated to the outside through the heat dissipation strip grooves on the support block and various parts of the mold until the product cools, solidifies and sets. Step Seven: Mold opening and core pulling: After cooling, the injection molding machine drives the moving mold assembly to open the mold upward along the guide device. The upper module drives the abutment block and tilting rod to rise together. The tilting rod acts in the opposite direction on the tilting channel, pulling the sliding block to drive the sealing block to retreat along the bearing channel in the direction away from the cavity. The hole-forming pin is smoothly pulled out from the hole-forming channel of the fourth molding block, and the hole-forming rod is smoothly pulled out from the hole-forming channel of the fourth molding block. The inner molding device at the front end of the sealing block completely withdraws from the cavity area. Step 8: Product ejection and demolding: After the moving mold assembly opens and rises to the preset position, the ejection mechanism of the injection molding machine moves to eject the molded core product from the lower molding cavity and demold, completing one injection molding cycle.

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