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CN-121973397-A - Quick-change injection mold for optical structural part

CN121973397ACN 121973397 ACN121973397 ACN 121973397ACN-121973397-A

Abstract

The invention discloses a quick-change injection mold for an optical structural member, which relates to the technical field of injection molding and comprises an upper mold assembly, a lower mold assembly, a front mold core and a rear mold core, wherein the upper mold assembly and the lower mold assembly are in locking connection through a first locking buckle, the upper mold assembly comprises an upper mold plate, at least two first positioning rods which are distributed diagonally are arranged on the upper mold plate, the lower mold assembly comprises a lower mold plate, at least two second positioning rods which are distributed diagonally are arranged on the lower mold plate, the second positioning rods are in one-to-one correspondence with the first positioning rods, a first positioning sleeve which is in plug connection with the first positioning rods is fixedly connected in the front mold core, a second positioning sleeve which is in plug connection with the second positioning rods is fixedly connected in the rear mold core, the rear mold core is in locking connection with the front mold core through a second locking buckle, and the front mold core and the rear mold core are used for injection molding a product with a water gap frame. The invention solves the problem that the precision and the rigidity are difficult to balance when the injection mold in the prior art relates to the production of optical structural parts.

Inventors

  • WEN SHENG
  • XIE XUELAN

Assignees

  • 深圳市中升薄膜材料有限公司

Dates

Publication Date
20260505
Application Date
20260408

Claims (13)

  1. 1. The quick-change injection mold for the optical structural part is characterized by comprising an upper mold assembly (10), a lower mold assembly (20), a front mold core (30) and a rear mold core (40), wherein the upper mold assembly (10) and the lower mold assembly (20) are in locking connection through a first mold locking buckle (50), the upper mold assembly (10) comprises an upper mold plate (11), and at least two first positioning rods (12) which are diagonally distributed are arranged on the upper mold plate (11); The lower die assembly (20) comprises a lower die plate (21), wherein at least two second positioning rods (22) which are diagonally distributed are arranged on the lower die plate (21), and the second positioning rods (22) are in one-to-one correspondence with the first positioning rods (12); The front mold core (30) is fixedly connected with a first positioning sleeve (31) which is in plug connection with the first positioning rod (12), the rear mold core (40) is fixedly connected with a second positioning sleeve (41) which is in plug connection with the second positioning rod (22), the rear mold core (40) is in locking connection with the front mold core (30) through a second locking buckle (60), and the front mold core (30) and the rear mold core (40) are used for injection molding into a product (100) with a water gap frame (101).
  2. 2. The quick-change injection mold for optical structural members according to claim 1, wherein a hot runner structure (13) is provided in the upper mold assembly (10), a branch runner (32) and a first molding cavity (33) are provided on an end surface of the front mold core (30), a second molding cavity (42) and a third molding cavity (43) which are communicated are provided on an end surface of the rear mold core (40), and the hot runner structure (13) is used for enabling fluid to circulate to the branch runner (32) so that the fluid fills the first molding cavity (33), the second molding cavity (42) and the third molding cavity (43), and a product (100) with a water gap frame (101) is obtained.
  3. 3. The quick-change injection mold for optical structural members according to claim 2, wherein a main runner is provided in the hot runner structure (13), one end of the branch runner (32) is communicated with the main runner, the other end of the branch runner (32) is communicated with the second molding cavity (42), and the sectional area of the branch runner (32) along the fluid flow direction is gradually reduced, wherein a water gap frame (101) is injection molded in the second molding cavity (42), and the first molding cavity (33) and the third molding cavity (43) are injection molded into a product (100).
  4. 4. A quick-change injection mold for optical structural members according to claim 3, wherein said hot runner structure (13) comprises a first runner plate (131) and a first stripper plate (132) fixedly installed in said upper mold plate (11), respectively, said upper mold plate (11) is provided with a second stripper plate (133) and a second runner plate (134) in sequence in a stacked manner, said first runner plate (131) is crimped with runner tubes (135) respectively nested with said first stripper plate (132) and said second stripper plate (133); The first stripper plate (132) and the second stripper plate (133) are used for demolding a water gap of an injection mold, and when the injection mold is used for injection molding, fluid sequentially passes through the second runner plate (134), the runner pipe (135), the first runner plate (131), the front mold core (30) and the rear mold core (40).
  5. 5. The quick-change injection mold for optical structural members according to claim 4, wherein the upper mold assembly (10) further comprises an upper fixing plate (14), a heat insulation plate (15) and a guide post (16), the upper fixing plate (14) is fixedly connected with the second runner plate (134), a feed inlet (141) is formed in the upper fixing plate (14), and a flange (17) fixedly connected with the upper fixing plate (14) is arranged at the feed inlet (141); The guide pillar (16) sequentially passes through the second runner plate (134), the second stripper plate (133) and the upper template (11), and the guide sleeve (211) which is in plug-in fit with the guide pillar (16) is arranged on the lower template (21).
  6. 6. The quick-change injection mold for optical structural members according to claim 2 or 4, wherein a first liquid flow channel (111) is formed in the upper mold plate (11), a second liquid flow channel (34) is formed in the front mold core (30), a third liquid flow channel (44) is formed in the rear mold core (40), and a fourth liquid flow channel (212) is formed in the lower mold plate (21); The second liquid flow channel (34) and the third liquid flow channel (44) are arranged in a cross mode, and the first liquid flow channel (111), the second liquid flow channel (34), the third liquid flow channel (44) and the fourth liquid flow channel (212) are all used for containing cooling liquid for circulation so as to balance the temperature of an injection mold during injection molding operation.
  7. 7. The quick-change injection mold for optical structural members according to claim 4, wherein a mounting plate (136) nested with the runner tube (135) is fixedly mounted in the second stripper plate (133), a crochet hook (137) embedded in the runner of the first runner plate (131) is arranged in the mounting plate (136) in a penetrating manner, and the crochet hook (137) is used for preventing a water gap in the first runner plate (131) from falling off.
  8. 8. The quick-change injection mold for optical structural members according to any one of claims 2 to 5, wherein the front mold core (30) is provided with an exhaust hole (36) and an exhaust groove (37) which are mutually communicated, the exhaust hole (36) is communicated with the second molding cavity (42), the exhaust groove (37) is provided at an end face of the front mold core (30) opposite to the rear mold core (40), the exhaust groove (37) is communicated with at least one side wall of the front mold core (30), and the groove width of the exhaust groove (37) is larger than the aperture of the exhaust hole (36).
  9. 9. The quick-change injection mold for optical structural members according to claim 1, wherein a material ejecting assembly (70) is disposed in the lower mold assembly (20), and the material ejecting assembly (70) is configured to eject a product (100) formed on the front mold core (30) under an external lifting force and return to an initial position under an elastic force.
  10. 10. The quick-change injection mold for optical structural members according to claim 9, wherein the ejector assembly (70) comprises a first ejector plate (71) and a second ejector plate (72) which are sequentially stacked, the first ejector plate (71) is fixedly connected with an ejector rod (73), the second ejector plate (72) is embedded with an ejector pin (74), and a return spring (75) is arranged between the second ejector plate (72) and the lower mold assembly (20); The first ejector plate (71) and the second ejector plate (72) are both in sliding connection in the lower die assembly (20), a first through hole (47) is formed in the rear die core (40), and the ejector pin (74) is inserted into the first through hole (47) and is abutted to the formed water gap frame (101) relative to one end of the second ejector plate (72).
  11. 11. The quick-change injection mold for the optical structural members according to claim 1, wherein a first hanging ring hole (213) for installing hanging rings is formed in the side wall of the lower mold plate (21), a first hanging hole (35) is formed in the side wall of the front mold core (30), a second hanging hole (45) is formed in the side wall of the rear mold core (40), and the first hanging hole (35) and the second hanging hole (45) are used for hanging a hanging mold bolt when the front mold core (30) and the rear mold core (40) are replaced.
  12. 12. The quick-change injection mold for optical structural members according to claim 1 or 11, wherein the front mold core (30) is fixedly provided with two third positioning rods (38) which are diagonally distributed, the rear mold core (40) is fixedly provided with two third positioning sleeves (46) which are diagonally distributed, and the third positioning rods (38) are in one-to-one corresponding plug-in connection with the third positioning sleeves (46); The two third positioning rods (38) and the two first positioning sleeves (31) are distributed at four corners of the front die core (30) in a staggered mode, and the two third positioning sleeves (46) and the two second positioning sleeves (41) are distributed at four corners of the rear die core (40) in a staggered mode.
  13. 13. The quick-change injection mold for optical structural members according to claim 1, wherein the lower mold assembly (20) further comprises a lower fixing plate (23), two lower mold separation plates (24) are fixedly installed between the lower fixing plate (23) and the lower mold plate (21), and one end of the first mold locking buckle (50) is fixedly connected with the lower mold plate (21) through screws.

Description

Quick-change injection mold for optical structural part Technical Field The invention relates to the technical field of injection molding, in particular to a quick-change injection mold for an optical structural member. Background With the continuous improvement of the requirements for optical performance in the fields of consumer electronics, automobile illumination, medical equipment, intelligent wearing and the like, the requirements for various precision optical structural members (such as lenses, light guide plates, optical lenses, aspheric optical elements and the like) are growing increasingly, and the characteristics of multiple varieties, small batches and high iteration are presented. Injection molding has become a core manufacturing process in this field because of its ability to efficiently and complexly mold polymer optics. However, the production of optical structures places extremely stringent demands on the mold and process, in that extremely low internal molding stresses must be ensured to avoid birefringence and optical distortion, extremely high cavity surface quality and dimensional accuracy are provided to ensure optical surface shape, and at the same time, high uniformity and stability of melt flow are required to ensure uniformity of optical properties (e.g., light transmittance, refractive index) of the material. In the prior art, the conventional integral injection mold can meet the quality requirements under specific conditions after being optimized for a single optical piece. However, conventional mold modes expose a serious efficiency bottleneck when production tasks require frequent switching between different models, different materials, or different colors of optics. The molding of the optical piece requires extremely high mold closing precision and rigidity to eliminate flash and ensure dimensional stability. After the interfaces of the conventional quick-change die carrier and the die core are disassembled and assembled for many times, the positioning precision and the die locking rigidity which are the same as those of the integral die are difficult to maintain, and the slight gap or deformation can cause stress or contour error of the optical piece. Therefore, the injection mold in the prior art has the problem that the balance of precision and rigidity is difficult when the optical structural member is produced. Disclosure of Invention The invention aims to provide a quick-change injection mold for an optical structural member, which solves the problem that the precision and the rigidity are difficult to balance when the injection mold in the prior art relates to the production of the optical structural member. To achieve the purpose, the invention adopts the following technical scheme: The quick-change injection mold for the optical structural part comprises an upper mold assembly, a lower mold assembly, a front mold core and a rear mold core, wherein the upper mold assembly and the lower mold assembly are tightly connected through a first mold locking buckle, the upper mold assembly comprises an upper mold plate which is tightly connected with the front mold core through screws, and at least two first positioning rods which are diagonally distributed are arranged on the upper mold plate; The lower die assembly comprises a lower die plate which is fixedly connected with the rear die core through screws, at least two second positioning rods which are diagonally distributed are arranged on the lower die plate, and the second positioning rods correspond to the first positioning rods one by one; the front mold core is fixedly connected with a first positioning sleeve which is in plug fit with the first positioning rod, the rear mold core is fixedly connected with a second positioning sleeve which is in plug fit with the second positioning rod, the rear mold core is in locking connection with the front mold core through a second locking buckle, and the front mold core and the rear mold core are used for injection molding into a product with a water gap frame. Optionally, a hot runner structure is arranged in the upper die assembly, a branch runner and a first molding cavity are arranged on the end face of the front die core, a second molding cavity and a third molding cavity which are communicated are arranged on the end face of the rear die core, and the hot runner structure is used for enabling fluid to circulate to the branch runner so that the fluid fills the first molding cavity, the second molding cavity and the third molding cavity, and a product with a water gap frame is obtained. Optionally, a main runner is arranged in the hot runner structure, one end of the branch runner is communicated with the main runner, the other end of the branch runner is communicated with the second molding cavity, the sectional area of the branch runner along the fluid flow direction is gradually reduced, a water gap frame is molded in the second molding cavity in an injection mode, and t