A concentric shaft hole sub-sequence forming die

Abstract

The application relates to the technical field of molds, and discloses a concentric shaft hole sequence forming mold capable of guaranteeing the concentricity of a shaft hole of a lens sleeve in an injection molding process, which solves the problem that the concentricity of the lens sleeve is difficult to guarantee in injection molding and comprises an upper fixed plate and a lower fixed plate used for being connected with an injection molding machine, the upper fixed plate is provided with an upper fixed groove, a female mold plate is arranged in the upper fixed groove, a supporting plate and a bearing plate are sequentially arranged on the lower fixed plate, the bearing plate is provided with a lower fixed groove, a male mold plate is arranged in the lower fixed groove, the male mold plate and the female mold plate are provided with a mold closing device used for guaranteeing mold closing precision, the female mold plate and the male mold plate are provided with a mold core device used for forming the lens sleeve and guaranteeing the precision of a connecting shaft sleeve of the lens sleeve, the female mold plate and the male mold plate are further provided with an injection molding device used for injecting material into the mold core device, and the lower fixed plate and the bearing plate are further provided with an ejection device used for ejecting an injection molding product and waste.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and in particular to a concentric shaft hole sequential molding mold. Background Technology

[0002] As a core component of the optical imaging system, the precision of the drone's lens assembly directly affects image quality and flight stability. For example, Figure 1 The image shows a lens cover, including a lens cover body 1', a connecting bushing 2', a first connecting ear, and a second connecting ear on the lens cover body 1'. The connecting bushing 2' has a connecting bushing chamber 3', an upper shaft hole 4' and a lower shaft hole at both ends of the connecting bushing 2', and the upper and lower end faces of the connecting bushing 2'. These structures need to have extremely high coaxiality and positional accuracy. In particular, the shaft hole part of the connecting bushing 2', any slight eccentricity or deformation will cause the lens optical axis to shift, resulting in image blurring or distortion.

[0003] In existing technologies, lens sleeves are typically injection molded using two-plate or three-plate molds. However, in traditional manufacturing, directly molding the connecting bushing with a molding core can lead to problems in ensuring the concentricity of the shaft and hole, and burrs can easily form inside the connecting bushing during demolding. Furthermore, the sliders or inserts used to mold the connecting bushing and the slots are prone to slight misalignment due to the fitting clearance during mold closing, resulting in misalignment of the inner and outer circles of the molded bushing, or deviations in the slot position. Summary of the Invention

[0004] Therefore, in view of the above problems, the present invention proposes a concentric shaft hole sequential molding mold that can ensure the concentricity of the shaft hole during the injection molding process of the lens cover.

[0005] To solve the above-mentioned technical problems, the solution adopted by the present invention is as follows: a concentric shaft hole sequential molding die, comprising a fixed mold assembly fixedly mounted 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 pillars for opening and closing the mold. The movable mold assembly includes an upper fixed plate for connecting to the injection molding machine, the upper fixed plate having an upper fixed groove, and a female mold plate being disposed within the upper fixed groove. The fixed mold assembly includes a lower fixed plate fixedly mounted on the injection molding machine, the lower fixed plate having a support plate and a bearing plate sequentially mounted thereon, the bearing plate having a lower fixed groove, and a male mold plate being disposed within the lower fixed groove. A mold closing device for ensuring mold closing accuracy is provided between the male mold plate and the female mold plate. A [further details about the device are missing from the original text]. The device includes a mold core assembly for molding a lens sleeve and ensuring the precision of the lens sleeve's connecting bushing. An injection molding device is provided between the female and male mold plates to inject material into the mold core assembly. An ejection device is provided between the lower fixed plate and the support plate to eject the molded product and waste material. The mold core assembly includes an upper mold core and a lower mold core. The upper mold core is located on the female mold plate and has an upper molding cavity that matches half of the lens sleeve's shape. The lower mold core has a lower molding cavity that matches the other half of the lens sleeve. A first precision molding device is provided on one side of the upper and lower mold cores to ensure the injection molding precision of the lens sleeve's connecting bushing. A second precision molding device is provided on the other side of the upper and lower mold cores to ensure the injection molding precision of the lens sleeve's first connecting ear.

[0006] A further improvement is made to the first precision forming device, which includes a first sliding mold core for forming the connecting sleeve cavity of the lens sleeve. The upper mold core and the lower mold core are provided with a first sliding mold channel at the position of the connecting sleeve. The first sliding mold core is slidably disposed in the first sliding mold channel. A first mold core block for forming a slot on the connecting sleeve is provided on one side wall of the first sliding mold core. The first mold core block is rectangular so that it can slide into and out of the slot quickly. The end of the first mold core block is arc-shaped to match the inner wall of the connecting sleeve. A first sliding device for driving the first mold core to slide is provided between the female mold plate and the male mold plate. An end forming device for forming both ends of the connecting sleeve is also provided on the upper mold core and the lower mold core.

[0007] A further improvement is that the end forming device includes an upper forming rod for forming the upper end of the connecting bushing and a lower forming rod for forming the lower end of the connecting bushing. The upper forming rod is mounted on the upper mold core via an upper ejector rod and resists the first mold core block when the mold is closed. The lower forming rod is mounted on the support plate via a lower ejector rod and resists the first mold core block when the mold is closed.

[0008] A further improvement is made in that: the first sliding device includes a first sliding block, the male and female mold plates are provided with a first sliding channel, the first sliding block is slidably disposed in the first sliding channel, the first mold core is fixedly disposed on the first sliding block, the female mold plate is provided with a first tilting rod, the other end of the first sliding block is provided with a first tilting channel that penetrates the first sliding block, the first tilting rod is disposed in the first tilting channel so that when the mold is closed, the first tilting rod drives the first sliding block to slide, thereby driving the first mold core to be inserted into the first mold channel to complete the mold closure, and when the mold is opened, the first tilting rod drives the first sliding block to slide back to its original position, thereby driving the first mold core to slide out of the first mold channel to complete the mold opening, the female mold plate is provided with a first abutting block in a vertical direction, the first abutting block is provided with an inclined first abutting surface, the first sliding block is provided with an inclined second abutting surface, the first abutting surface and the second abutting surface resist each other so that when the mold is closed, the first mold core can be pressed against the upper mold core and the lower mold core to ensure injection molding accuracy.

[0009] A further improvement is that the second precision forming device includes a second sliding mold core for forming the first connecting ear of the lens cover. The upper mold core and the lower mold core are provided with a second sliding mold channel at the position of the first connecting ear. The second sliding mold core is slidably disposed in the second sliding mold channel. A second mold core block with a slot for forming the first connecting ear is provided on one side wall of the second sliding mold core. The second mold core block is matched with the slot of the first connecting ear. A second sliding device for driving the second mold core to slide is provided between the female mold plate and the male mold plate.

[0010] A further improvement is made to the second sliding device, which includes a second sliding block. The male and female mold plates have second sliding channels. The second sliding block is slidably disposed within the second sliding channel. The second mold core is fixedly disposed on the second sliding block. The female mold plate has a second inclined rod. The other end of the second sliding block has a second inclined channel penetrating the second sliding block. The second inclined rod passes through the second inclined channel, causing the second sliding block to slide during mold closing, thereby engaging the second mold core in the second mold channel to complete mold closing. During mold opening, the second inclined rod causes the second sliding block to slide back to its original position, thereby sliding the second mold core out of the second mold channel to complete mold opening. The female mold plate has a second abutment block fixed vertically. The second abutment block has an inclined third abutment surface, and the second sliding block has an inclined fourth abutment surface. The third and fourth abutment surfaces resist each other, allowing the second mold core to press firmly against the upper and lower mold cores during mold closing to ensure injection molding accuracy.

[0011] A further improvement is made to the injection molding device, which includes a nozzle that passes through the female template and the upper fixed plate. An injection flow channel is provided between the upper mold core and the lower mold core. The lower mold core includes a lower mold core body, an injection mold core for injection molding of plastic, and a connecting ear mold core for molding the second connecting ear of the lens sleeve. The injection mold core is detachably mounted on the lower mold core body for easy replacement and maintenance. The side wall of the injection mold core located in the lower molding cavity has an injection port for the inflow of carbon fiber material. An injection channel communicating with the injection mold core is also provided between the female template and the male template, allowing the carbon fiber injection plastic to flow into the injection mold core and then out from the injection port. The other end of the injection channel is connected to the nozzle. The connecting ear mold core, which matches the second connecting ear of the lens sleeve, is detachably mounted on the lower mold core for easy replacement of the connecting ear mold core.

[0012] A further improvement is made to the mold closing device, which includes four coarse guide pillars evenly distributed on the upper fixed plate. The bearing plate is provided with coarse guide sleeves at positions matching the coarse guide pillars, allowing the coarse guide pillars to pass through the coarse guide sleeves during mold closing. The female mold plate is also provided with four fine guide sleeves evenly distributed on it, and the male mold plate is provided with fine guide pillars matching the fine guide sleeves, enabling forced correction of the female and male mold plates during mold closing to ensure accuracy.

[0013] A further improvement is that it also includes a first magnetic block and a second magnetic block. The first magnetic block is symmetrically fixed on the upper fixed plate, and the second magnetic block is symmetrically fixed on the support plate. When the mold is closed, the first magnetic block and the second magnetic block resist each other and magnetically attract each other, so that when the mold is opened, the support plate and the upper fixed plate slide simultaneously, so that the injection molded part fixed on the support plate is demolded first.

[0014] By adopting the aforementioned technical solution, the beneficial effects of the present invention are: The sequential precision molding process ensures the concentricity of the shaft hole during the injection molding of the lens sleeve. Through a first and a second precision molding device, the sequential molding and segmented demolding of the inner wall, side walls, and end face of the sleeve are achieved. The first mold core block, in close cooperation with the upper and lower molding rods during mold closing, jointly defines the high-precision contour of the inner wall of the shaft hole, effectively avoiding the eccentricity problem caused by the fit clearance of traditional integral sliders, and ensuring the roundness and coaxiality of the connecting sleeve. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the lens sleeve structure in the background technology of this invention.

[0016] Figure 2 This is a schematic diagram of a concentric shaft hole sequential forming mold structure according to an embodiment of the present invention.

[0017] Figure 3 This is a partial structural diagram of a concentric shaft hole sequential forming mold according to an embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of the cross-sectional structure of a concentric shaft hole sequential forming mold according to an embodiment of the present invention.

[0019] Figure 5 This is a partial structural diagram of a concentric shaft hole sequential forming mold according to an embodiment of the present invention.

[0020] Figure 6 This is a partial structural diagram of a concentric shaft hole sequential forming mold according to an embodiment of the present invention.

[0021] Figure 7 This is an enlarged structural schematic diagram of section A in embodiment A of the present invention.

[0022] Figure 8 This is a partial structural diagram of a concentric shaft hole sequential forming mold according to an embodiment of the present invention.

[0023] Figure 9 This is an enlarged structural schematic diagram of section B in embodiment B of the present invention.

[0024] Figure 10 This is an enlarged structural schematic diagram of section C in embodiment C of the present invention.

[0025] Figure 11 This is a partial structural diagram of a concentric shaft hole sequential forming mold according to an embodiment of the present invention.

[0026] Figure 12 This is an enlarged structural schematic diagram of section D in embodiment D of the present invention.

[0027] Figure 13 This is a schematic diagram of the upper mold core structure in an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached drawings: 1. Upper fixed plate; 13. First sliding channel; 14. First inclined channel; 15. First sliding block; 151. Second sliding block; 16. First inclined rod; 161. Second inclined rod; 17. First abutment block; 171. Second abutment block; 18. First mold core; 181. Second mold core; 182. First mold core block; 183. Second mold core block; 19. Upper mold core; 191. Injection protrusion 2. Lower fixing plate; 20. Lower mold core; 24. Lower forming rod; 25. Upper forming rod; 201. Connecting ear mold core; 202. Injection mold core; 211. Injection runner; 3. Support plate; 31. Female mold plate; 4. Bearing plate; 41. Male mold plate; 42. Precision guide post; 5. Sprue; 51. Guide post; 6. Coarse guide post; 8. Second magnetic block; 9. First magnetic block; 10. Upper ejector plate; 11. Lower ejector plate; 12. Mold foot. Detailed Implementation

[0029] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0030] Example: Please see Figures 2 to 4 This embodiment provides a concentric shaft hole sequential molding die, including: a fixed mold assembly fixed on the fixed plate of an injection molding machine and a movable mold assembly fixed on the moving plate of the injection molding machine. The movable mold assembly includes an upper fixed plate 1 for connecting to the injection molding machine. An upper fixed groove is provided on the upper fixed plate 1, and a female template 31 is fixedly embedded in the upper fixed groove. The fixed mold assembly includes a lower fixed plate 2 fixed on the injection molding machine. A support plate 3 and a bearing plate 4 are sequentially fixedly stacked on the lower fixed plate 2. A lower fixed groove is provided on the bearing plate 4, and a male template 41 is fixedly embedded in the lower fixed groove. The male template 41 is arranged opposite to the female template 31. The movable mold assembly and the fixed mold assembly achieve initial guidance for mold opening and closing through four guide pillars 51 passing through the entire mold.

[0031] To achieve extremely high alignment accuracy during each mold closing, this mold is equipped with a mold closing device. Specifically, such as... Figure 2 As shown, four coarse guide posts 6 are evenly fixed at the four corners of the upper fixed plate 1, and four coarse guide sleeves are fixed at corresponding positions on the bearing plate 4. During mold closing, the coarse guide posts 6 first enter the coarse guide sleeves to achieve rough guidance and avoid collision between the female mold plate 31 and the male mold plate 41 during initial contact. Four fine guide sleeves are also evenly fixed at the four corners of the female mold plate 31, and four fine guide posts 42 are fixed at corresponding positions on the male mold plate 41. The fit clearance and machining accuracy of the fine guide posts 42 and the fine guide sleeves are much higher than those of the coarse guide posts 6 and the coarse guide sleeves, belonging to a precision sliding fit. During mold closing, the fine guide posts 42 forcefully guide the fine guide sleeves, allowing the female mold plate 31 and the male mold plate 41 to directly fit together, reducing accumulated errors. This invention eliminates the traditional integral mold core, instead directly assembling the various parts of the mold core device used for forming the lens sleeve onto the male mold plate 41 and the female mold plate 31. The relative positions of these parts are not determined by the mold core itself, but by the precise guidance of the two templates. This is like two precision gears meshing directly, rather than relying on other parts in the middle for transmission. The positioning reference is completely unified, eliminating accumulated errors from the physical source.

[0032] To facilitate injection molding, such as Figures 3-10 As shown, a mold core device is provided between the male template 41 and the female template 31 for directly forming the outline of the lens sleeve. Specifically, the mold core device includes an upper mold core 19 and a lower mold core 20. The upper mold core 19 is fixed to the female template 31 and has an upper forming cavity that matches the outline of the upper half of the lens sleeve. The lower mold core 20 is fixed to the male template 41 and has a lower forming cavity that matches the outline of the lower half of the lens sleeve. The upper forming cavity and the lower forming cavity together form a complete lens sleeve cavity when the mold is closed.

[0033] like Figures 4-10In order to form the connecting shaft sleeve with the highest precision requirements in the lens sleeve and the first connecting ear on the side, the mold core device is provided with a first precision forming device on one side and a second precision forming device on the other side.

[0034] like Figures 4-10 As shown, the first precision forming device is specifically used to form the connecting bushing part of the lens sleeve, especially the inner wall, side wall slots, and two end faces of the bushing. It includes a first sliding mold core 18, a first sliding device, and an end forming device. Specifically, a first sliding mold channel is provided at the position of the upper mold core 19 and the lower mold core 20 where the connecting bushing is located. The first sliding mold core 18 is slidably disposed in the first sliding mold channel. A first mold core block 182 is provided on one end side wall of the first sliding mold core 18. The first mold core block 182 is rectangular and is used to form the slots on the side wall of the connecting bushing. The rectangular structure allows it to slide into and out of the slot position quickly and stably. The end of the first mold core block 182 is arc-shaped. The arc-shaped surface directly forms part of the inner wall of the connecting bushing when the mold is closed. The arc-shaped design can ensure that the inner wall of the bushing is smooth and continuous after forming, avoiding stress concentration caused by sharp corners.

[0035] like Figure 9 and Figure 10 The end forming device includes an upper forming rod 25 and a lower forming rod 24. The upper forming rod 25 is fixed to the upper mold core 19 by an upper ejector rod, and the lower forming rod 24 is fixed to the support plate 3 by a lower ejector rod. During mold closing, the lower end face of the upper forming rod 25 resists the upper surface of the first mold core block 182, and the upper end face of the lower forming rod 24 resists the lower surface of the first mold core block 182. In this way, the upper forming rod 25, the first mold core block 182, and the lower forming rod 24 together form the complete inner wall and end face contours of the connecting bushing. It can be understood that traditional integral slider one-time forming of the shaft hole is equivalent to carving out the inner cavity from a single piece of material, which is difficult to process, prone to eccentricity, and easily produces burrs. In this embodiment, the molding process of the inner wall of the connecting bushing is broken down into three independent parts: the upper molding rod 25 is responsible for the upper end face, the first mold core block 182 is responsible for the main body of the inner wall, and the lower molding rod 24 is responsible for the lower end face. Each part can be individually precision machined and the fitting clearance can be adjusted. When the mold is closed, they come together tightly from multiple directions, ensuring that the roundness and concentricity of the inner hole of the bushing are far superior to those of traditional structures. Moreover, it allows for rapid demolding when the mold is opened, ensuring that the connecting bushing is not damaged and reducing the generation of burrs.

[0036] like Figures 4-8To drive the first sliding mold core 18 into the forming position during mold closing and out of the core-pulling position during mold opening, this mold is equipped with the aforementioned first sliding device, including a first sliding block 15 and a first abutment block 17. The male mold plate 41 and female mold plate 31 have first sliding channels 13. The first sliding block 15 is slidably disposed within the first sliding channel 13. The first sliding mold core 18 is fixed to the first sliding block 15. The female mold plate 31 has a first inclined rod 16 fixed at an inclination. The other end of the first sliding block 15 has a through first inclined channel 14, and the first inclined rod 16 passes through the first inclined channel 14. During mold closing, the female mold plate 31 drives the first inclined rod 16 downwards. The first inclined rod 16, through a wedge action, pushes the first sliding block 15 horizontally towards the center of the mold, thereby causing the first sliding mold core 18 to engage in the first sliding channel and reach the forming position. Meanwhile, a first abutment block 17 is vertically fixed on the mother mold 31. The first abutment block 17 has an inclined first abutment surface, and the first sliding block 15 has a corresponding second abutment surface. When the mold is closed, the first abutment surface and the second abutment surface resist each other, generating a downward component force, which presses the first sliding block 15 and the first sliding core 18 fixed thereon tightly onto the lower mold core 20. It should be noted that the first tilting rod 16 provides lateral driving force, while the first abutment block 17 provides vertical locking force. The combination of the two completely eliminates the impact of high-pressure plastic on the first sliding core 18 during injection molding, preventing it from retreating or floating, thereby ensuring the uniformity of the wall thickness and dimensional stability of the connecting bushing. When the mold is opened, the first tilting rod 16 moves upward, causing the first sliding block 15 to slide out in the opposite direction, and the first sliding core 18 is smoothly pulled out from the groove and inner wall of the molded product, completing the lateral core pulling.

[0037] The second precision forming device is used to form the first connecting ear on the side of the lens sleeve. It includes a second sliding core 181, a second sliding block 151, and a second tilting rod 161. The upper mold core 19 and lower mold core 20 are located at the first connecting ear position and have a second sliding channel. The second sliding core 181 is slidably disposed within the second sliding channel. A second mold core block 183 is provided on one end of the side wall of the second sliding core 181. The shape of the second mold core block 183 matches the slot of the first connecting ear. The second tilting rod 161 is tilted on the mother mold 31. The other end of the second sliding block 151 has a second tilting channel penetrating the second sliding block 151. The second tilting rod 161 passes through the second sliding block 151. Within the inclined channel, during mold closing, the second inclined rod 161 drives the second sliding block 151 to slide, thereby causing the second sliding mold core 181 to engage within the second sliding mold channel, completing mold closing. During mold opening, the second inclined rod 161 drives the second sliding block 151 to slide back to its original position, thereby causing the second sliding mold core 181 to slide out of the second sliding mold channel, completing mold opening. A second abutment block 171 is vertically fixed on the mother mold plate 31. The second abutment block 171 has an inclined third abutment surface, and the second sliding block 151 has an inclined fourth abutment surface. The third and fourth abutment surfaces resist each other, allowing the second sliding mold core 181 to abut against the upper and lower mold cores during mold closing to ensure injection molding accuracy. The second sliding block 151 slides horizontally under the drive of the second inclined rod 161, and the second abutment block 171 provides vertical locking force. The working principle is exactly the same as the first sliding device, and will not be described again here. The first connecting lug can also be formed with the same level of precision as the bushing through the second precision forming device, ensuring the positional accuracy and dimensional consistency of the first connecting lug.

[0038] like Figures 7-9 In order to inject molten carbon fiber reinforced plastic into the mold cavity, an injection molding device is also provided between the female mold plate 31 and the male mold plate 41. Specifically, the injection molding device includes a nozzle 5, which passes through the upper fixed plate 1 and the female mold plate 31 and communicates with the injection runner 211 opened between the upper mold core 19 and the lower mold core 20.

[0039] Because carbon fiber material is used for injection molding, the lower mold core 20 is prone to wear. Furthermore, the lens case requires high precision in injection molding. Therefore, to facilitate maintenance and replacement of vulnerable parts and further improve injection molding precision, the lower mold core 20 adopts a modular design. Specifically, the lower mold core 20 includes a lower mold core body, an injection mold core 202 for injection molding of plastic, and a connecting ear mold core 201 for molding the second connecting ear of the lens case. The injection mold core 202 is detachably mounted on the lower mold core body via bolts. A submarine gate, i.e., an injection port 23, is provided on the side wall of the injection mold core 202 at the lower molding cavity. An injection channel 21, communicating with the injection mold core 202, is also provided between the female mold plate 31 and the male mold plate 41. The other end of the injection channel 21 is connected to the sprue 5. Molten plastic enters through the sprue 5, flows into the injection mold core 202 through the injection channel 21, and then fills the cavity at a low speed and pressure through the submarine gate, avoiding direct impact on the second sliding mold core 181 and other parts. Side injection feeding positions the injection point on the side of the lens sleeve, thus not affecting the precision of the upper and lower ends of the lens sleeve, improving quality and facilitating subsequent processing of the injection point. The connecting ear mold core 201 is also detachably mounted on the lower mold core 20 using bolts. This design has the advantage that when the gate of the injection mold core 202 wears due to long-term use, or when the second connecting ear needs to be changed, only the corresponding insert needs to be replaced, without replacing the entire lower mold core 20, greatly reducing maintenance costs. Furthermore, the detachable lower mold core 20 allows for easy mold repair at every point of the mold core, ensuring better injection precision on the lens sleeve end face and thus improving product quality.

[0040] like Figures 11-13 To further address the issue of carbon fiber reinforced materials easily breaking apart during demolding after injection molding, an injection protrusion 191 is provided on the inner wall of the injection channel, near the injection port, of the upper mold core 19. While carbon fiber reinforced plastics possess high strength and rigidity, they also exhibit strong elasticity. In traditional molds, after injection molding, the product and the runner waste in the injection channel are connected through a gate with a small cross-sectional area. During ejection, the ejector pin simultaneously lifts the product and the runner waste, forcibly breaking or severing the connection point. Due to the high elasticity of carbon fiber, this "breakage" generates a significant rebound force, which is transmitted along the connection point to the already molded product. This can easily lead to chipping, white marks, or even cracks near the gate, resulting in product scrap.

[0041] To avoid this problem, this embodiment features an injection protrusion 191 on the inner wall of the injection channel, near the injection port. This protrusion 191 creates an abrupt change in cross-section within the injection channel. When the molten plastic fills the injection channel and cools and solidifies, the cross-section of the runner waste changes significantly at the protrusion 191 – it is thinner at the protrusion and thicker before and after it. This abrupt change in cross-section creates a "stress concentration zone" or a "pre-set fracture guide zone" in the runner waste at that location. However, unlike directly pre-setting a weak point, due to the elasticity of the carbon fiber material, this abrupt cross-section area does not break directly during normal ejection; instead, it becomes an elastic notch capable of elastic deformation. This elastic notch alters the connection between the injection waste and the product. In traditional structures, the connection between the waste and the product is rigid and linear, and they can only separate through brittle fracture during demolding. With the injection protrusion 191, the runner scrap gains a flexible section near the connection point with the product, allowing for elastic bending. When the ejector lifts both the product and the runner scrap upwards simultaneously, the runner scrap can undergo a certain degree of elastic bending deformation at the injection protrusion 191, instead of being immediately pulled apart. This slightly elastic connection allows the scrap to release internal stress through bending before the product is completely ejected from the mold core. Only after the product has been ejected to a safe position does the scrap naturally separate from the product—or even if external force is needed to cut it, the cutting force is greatly buffered by the elastic bending, preventing a violent rebound impact. Simply put, the traditional structure is like using a rigid straight rod to connect the product and the scrap. Ejection is like breaking a rigid straight rod; the elastic force at the moment of brittle breakage can easily damage the product. The elastic notch, on the other hand, is like setting a "spring joint" at the connection point. During demolding, the joint bends first to release some force, and then separates gently, thus protecting the product from damage. By using injection protrusion 191, this mold successfully transforms the inherent weakness of carbon fiber material's high elasticity, which could easily lead to product breakage, into an advantage that facilitates flexible demolding. This not only significantly reduces the scrap rate at the gate location but also allows the mold to be adapted to carbon fiber reinforced materials with higher elastic modulus, further improving the molding quality and production stability of precision optical components such as lens cases.

[0042] To optimize the mold opening sequence and prevent product damage during demolding, this mold is also equipped with a magnetic mold closing device. For example... Figure 2 and Figure 4A first magnetic block 9 is symmetrically fixed on the upper fixed plate 1, and a second magnetic block 8 is symmetrically fixed on the support plate 4. The first magnetic block 9 and the second magnetic block 8 are positioned opposite each other and have opposite polarities when the mold is closed, generating a strong magnetic attraction. The magnetic attraction is effective in the initial mold opening stage. When the injection molding machine drives the upper fixed plate 1 to open the mold, because the magnetic attraction between the first magnetic block 9 and the second magnetic block 8 is greater than the friction between the support plate 4 and the support plate 3, and the sticking force between the male mold plate 41 and the female mold plate 31, the support plate 4 and its male mold plate 41 will temporarily move a short distance along with the upper fixed plate 1. At this time, since the support plate 3 is fixed to the lower fixed plate 2, the male mold plate 41 separates from the support plate 3 first. This separation action allows the lower forming rod 24, fixed to the support plate 3, to be preferentially extracted from the formed product, achieving segmented core removal. Subsequently, when the mold opening force continues to increase and exceeds the magnetic attraction force, the first magnetic block 9 separates from the second magnetic block 8, and the female mold plate 31 and male mold plate 41 fully open. At the same time, the first sliding mold core 18 and the second sliding mold core 181 complete lateral core pulling under the drive of the first and second tilting rods. This can be understood as follows: without a magnetic mold closing device, all actions occur simultaneously during mold opening. The friction between the lower forming rod 24 and the product, and the friction between the first sliding mold core and the slot, are superimposed, easily damaging the product. The magnetic mold closing device forces the lower forming rod to retract first, the first sliding mold core to retract later, and finally the upper forming rod to retract, ensuring that the most precise lower forming rod demolds before the main body of the product, significantly improving the product qualification rate.

[0043] Finally, after the mold opening is complete and all sliding mold cores have retracted, the molded product and runner waste need to be ejected from the male mold plate 41, for which an ejection device is provided. Figure 3 As shown, the ejection device includes a mold base 12, an upper ejector plate 10, a lower ejector plate 11, and multiple push rods. The mold base 12 is fixedly disposed between the lower fixed plate 2 and the support plate 3, and a cavity is formed inside the mold base 12. The upper ejector plate 10 and the lower ejector plate 11 are stacked together and slidably disposed within the cavity. The lower ends of the multiple push rods are fixed between the upper ejector plate 10 and the lower ejector plate 11, and the upper ends pass through the support plate 3, the bearing plate 4, and the male mold plate 41, aligning with the bottom of the product and the position of the runner waste. After the mold is opened, the ejector roller of the injection molding machine passes through the hole on the lower fixed plate 2, pushing the lower ejector plate 11 and the upper ejector plate 10 upward. The push rods rise accordingly, smoothly ejecting the molded lens sleeve product and the runner waste from the male mold plate. After ejection, the ejector roller retracts, and the ejector plate is reset by the return spring or the pull-back action of the injection molding machine, ready for the next mold closing.

[0044] Working principle: Mold Closure: The injection molding machine drives the upper fixed plate downwards, and the coarse guide post and coarse guide sleeve provide initial guidance, followed by precision alignment of the fine guide post and fine guide sleeve. During this process, the first tilting rod drives the first sliding mold core into the cavity, which cooperates with the upper forming rod and the lower forming rod to close it; the second tilting rod drives the second sliding mold core into the forming position, and the first and second abutment blocks provide vertical locking, while the first and second magnetic blocks attract each other.

[0045] Injection molding: Molten carbon fiber reinforced plastic enters the injection mold core from the injection molding machine nozzle through the sprue 5 and injection runner 211, and then smoothly fills the cavity through the submarine gate. After holding pressure and cooling, the product solidifies and is formed.

[0046] Mold opening: The injection molding machine moves the upper fixed plate. Due to the magnetic attraction, the support plate and male mold plate move a certain distance first, causing the lower molding rod fixed on the support plate to be pulled out from the lower end of the product bushing. Then the magnetic blocks separate, the female mold plate and male mold plate open, and at the same time the first tilting rod and the second tilting rod drive their respective first sliding mold cores and second sliding mold cores to slide outward, completing the lateral core pulling.

[0047] Ejection: After the mold is in place, the ejector roller of the injection molding machine pushes the ejector plate, and the push rod ejects the product and runner waste, which falls automatically or is taken out by the robot.

[0048] Reset: The ejector plate retracts, and the mold waits for the next mold closing, repeating the cycle.

[0049] 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 concentric shaft hole sequential molding die, 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 pillars for opening and closing the mold, characterized in that: The moving mold assembly includes an upper fixed plate for connection to an injection molding machine. The upper fixed plate has an upper fixed groove, within which a female mold plate is located. The fixed mold assembly includes a lower fixed plate fixed to the injection molding machine. A support plate and a bearing plate are sequentially arranged on the lower fixed plate. The bearing plate has a lower fixed groove, within which a male mold plate is located. A mold closing device is provided between the male and female mold plates to ensure mold closing accuracy. A mold core device is provided between the female and male mold plates for molding a lens sleeve and ensuring the precision of the lens sleeve's connecting bushing. A further device is provided between the female and male mold plates for... The injection molding device, which injects material into the mold core assembly, includes an ejector device between the lower fixed plate and the support plate for ejecting the finished product and waste material. The mold core assembly includes an upper mold core and a lower mold core. The upper mold core is mounted on a mother mold plate and has an upper molding cavity that matches half of the lens sleeve. The lower mold core has a lower molding cavity that matches the other half of the lens sleeve. A first precision molding device is provided on one side of the upper and lower mold cores to ensure the injection molding accuracy of the connecting shaft sleeve of the lens sleeve. A second precision molding device is provided on the other side of the upper and lower mold cores to ensure the injection molding accuracy of the first connecting ear of the lens sleeve. The first precision forming apparatus includes a first sliding mold core for forming the connecting sleeve cavity of the lens sleeve. The upper and lower mold cores are located at the connecting sleeve position and have a first sliding mold channel. The first sliding mold core is slidably disposed within the first sliding mold channel. One end sidewall of the first sliding mold core has a first mold core block for forming a slot on the connecting sleeve. The first mold core block is rectangular, allowing it to quickly slide into and out of the slot. The end of the first mold core block is arc-shaped to match the inner wall of the connecting sleeve. A first sliding device for driving the first mold core to slide is provided between the female and male mold plates. The upper and lower mold cores also have end forming devices for forming the two ends of the connecting sleeve. The end forming device includes an upper forming rod for forming the upper end of the connecting bushing and a lower forming rod for forming the lower end of the connecting bushing. The upper forming rod is mounted on the upper mold core via an upper ejector rod and resists the first mold core block when the mold is closed. The lower forming rod is mounted on the support plate via a lower ejector rod and resists the first mold core block when the mold is closed.

2. The concentric shaft hole sequential forming mold according to claim 1, characterized in that: The first sliding device includes a first sliding block. The male and female mold plates are provided with a first sliding channel. The first sliding block is slidably disposed in the first sliding channel. The first mold core is fixedly disposed on the first sliding block. The female mold plate is provided with a first inclined rod. The other end of the first sliding block is provided with a first inclined channel that passes through the first sliding block. The first inclined rod passes through the first inclined channel so that when the mold is closed, the first inclined rod drives the first sliding block to slide, thereby driving the first mold core to be inserted into the first mold channel to complete the mold closure. When the mold is opened, the first inclined rod drives the first sliding block to slide back to its original position, thereby driving the first mold core to slide out of the first mold channel to complete the mold opening. The female mold plate is provided with a first abutment block in a vertical direction. The first abutment block is provided with an inclined first abutment surface. The first sliding block is provided with an inclined second abutment surface. The first abutment surface and the second abutment surface resist each other, so that when the mold is closed, the first mold core can be pressed against the upper mold core and the lower mold core to ensure injection molding accuracy.

3. The concentric shaft hole sequential forming mold according to claim 1, characterized in that: The second precision forming device includes a second sliding mold core for forming a first connecting ear of a lens cover. The upper mold core and the lower mold core are provided with a second sliding mold channel at the position of the first connecting ear. The second sliding mold core is slidably disposed in the second sliding mold channel. A second mold core block with a slot for forming the first connecting ear is provided on one side wall of the second sliding mold core. The second mold core block is matched with the slot of the first connecting ear. A second sliding device for driving the second mold core to slide is provided between the female mold plate and the male mold plate.

4. The concentric shaft hole sequential forming mold according to claim 3, characterized in that: The second sliding device includes: a second sliding block; a second sliding channel is provided on the male and female mold plates; the second sliding block is slidably disposed within the second sliding channel; the second mold core is fixedly disposed on the second sliding block; a second inclined rod is inclinedly disposed on the female mold plate; a second inclined channel is provided through the other end of the second sliding block; the second inclined rod is disposed within the second inclined channel so that when the mold is closed, the second inclined rod drives the second sliding block to slide, thereby driving the second mold core to be inserted into the second mold channel to complete the mold closure; and when the mold is opened, the second inclined rod drives the second sliding block to slide back to its original position, thereby driving the second mold core to slide out of the second mold channel to complete the mold opening; a second abutment block is vertically fixed on the female mold plate; an inclined third abutment surface is provided on the second abutment block; and an inclined fourth abutment surface is provided on the second sliding block. The third abutment surface and the fourth abutment surface resist each other, so that when the mold is closed, the second mold core can be pressed against the upper mold core and the lower mold core to ensure injection molding accuracy.

5. The concentric shaft hole sequential forming mold according to claim 1, characterized in that: The injection molding device includes a nozzle that passes through the female template and the upper fixed plate. An injection flow channel is provided between the upper mold core and the lower mold core. The lower mold core includes a lower mold core body, an injection mold core for injection molding of plastic, and a connecting ear mold core for molding the second connecting ear of the lens sleeve. The injection mold core is detachably mounted on the lower mold core body for easy replacement and maintenance. The side wall of the injection mold core located at the lower molding cavity has an injection port for the inflow of carbon fiber material. An injection channel communicating with the injection mold core is also provided between the female template and the male template so that the carbon fiber injection plastic can flow into the injection mold core and then flow out from the injection port. The other end of the injection channel is connected to the nozzle. The connecting ear mold core matches the second connecting ear of the lens sleeve and is detachably mounted on the lower mold core for easy replacement of the connecting ear mold core.

6. The concentric shaft hole sequential forming mold according to claim 1, characterized in that: The mold closing device includes four coarse guide pillars, which are evenly distributed on the upper fixed plate. The bearing plate is provided with coarse guide sleeves at positions matching the coarse guide pillars. When the mold is closed, the coarse guide pillars can be inserted into the coarse guide sleeves. The female mold plate is also provided with four fine guide sleeves evenly distributed. The male mold plate is provided with fine guide pillars matching the fine guide sleeves, so that the female mold plate and the male mold plate can be forcibly corrected during mold closing to ensure accuracy.

7. The concentric shaft hole sequential forming mold according to claim 1, characterized in that: It also includes a first magnetic block and a second magnetic block. The first magnetic block is symmetrically fixed on the upper fixed plate, and the second magnetic block is symmetrically fixed on the support plate. When the mold is closed, the first magnetic block and the second magnetic block resist each other and magnetically attract each other, so that when the mold is opened, the support plate and the upper fixed plate slide simultaneously, so that the injection molded part fixed on the support plate is demolded first.

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