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CN-121989416-A - Flip-chip demolding structure of injection mold

CN121989416ACN 121989416 ACN121989416 ACN 121989416ACN-121989416-A

Abstract

The invention relates to the technical field of injection mold stripping, and discloses a flip-chip mold stripping structure of an injection mold, wherein a core insert comprises an outer core, an inner core is fixedly arranged in the outer core, movable ejection pieces are uniformly distributed on the outer side of the inner core along the circumferential direction, the outer surfaces of the ejection pieces are flush with the surfaces of the inner core, and pre-release adhesive assemblies distributed on a movable mold base are arranged on the periphery of the outer core.

Inventors

  • XU JIANHAI
  • LI BAOWEN
  • ZHANG PENGFEI
  • XIA XIAOPING

Assignees

  • 宁波昌亚新材料科技股份有限公司

Dates

Publication Date
20260508
Application Date
20260409

Claims (9)

  1. 1. The flip-chip demolding structure of the injection mold is characterized by comprising a core insert (70) arranged on a movable mold base (10), wherein the core insert (70) comprises an outer core (71), an inner core (72) is fixedly arranged in the outer core (71), movable ejection pieces (73) are uniformly distributed on the outer side of the inner core (72) along the circumferential direction, and the outer surface of each ejection piece (73) is flush with the surface of the inner core (72); A storage groove (721) for storing the ejection piece (73) is formed in the outer side wall of the inner core (72), and a guide groove (722) is formed in the inner side wall of the storage groove (721); a guide post (731) which is slidably assembled in the guide groove (722) is fixed on the side wall of the ejection piece (73), an electromagnet block (732) is fixed at the other end of the inner cavity of the guide groove (722), and a return spring (733) is fixedly connected between the guide post (731) and the electromagnet block (732); the periphery of the outer core (71) is provided with a pre-release adhesive component (80) which is arranged on the movable die holder (10), the pre-release adhesive component (80) comprises an annular air passage (81) which is arranged inside the movable die holder (10), and a static pressure air inlet hole (82) which is arranged on the surface of the movable die holder (10) and is communicated with the annular air passage (81) is arranged at the outer side of the outer core (71).
  2. 2. The flip-chip demolding structure of an injection mold according to claim 1, wherein the ejector members (73) are arranged in four groups, the size of each group of ejector members (73) is completely matched with the size of the accommodating groove (721), and the outer surface of each ejector member (73) is a main parting surface.
  3. 3. The flip-chip demolding structure of an injection mold according to claim 2, wherein the surface of each ejection member (73) is made of profiling flexible supporting silica gel, and the surface of the ejection member (73) is a profiling surface which is completely fitted with the contour of the inner surface of a product.
  4. 4. The flip-chip demolding structure of an injection mold according to claim 1, wherein the outer core (71) is embedded on the surface of the movable mold base (10), and the air outlet of the static pressure air inlet hole (82) is opposite to the surface of the outer core (71).
  5. 5. The flip-chip demolding structure of the injection mold according to claim 4, wherein the surface of the movable mold base (10) is provided with a secondary parting surface at the outer side of the outer mold core (71), a sealing ring (83) is fixedly nested in the secondary parting surface, and the sealing ring (83) is arranged at the outer side of the static pressure air inlet hole (82).
  6. 6. The flip-chip demolding structure of an injection mold according to claim 5, wherein an annular sealing groove is formed in the auxiliary parting surface, a sealing ring (83) is nested and assembled in the sealing groove, a gas storage cavity is reserved between the sealing ring (83) and the sealing groove, and the annular air passage (81) is externally connected with a vacuum generator and a high-precision pressure-stabilizing air source through a solenoid valve double-control loop.
  7. 7. The flip-chip demolding structure of an injection mold according to claim 1, wherein the diameter of the guide post (731) is the same as the diameter of the guide groove (722), and an iron sheet matched with the electromagnet block (732) is embedded in the end part of the guide post (731), and each group of electromagnet blocks (732) is connected with an external power supply.
  8. 8. The flip-chip demolding structure of an injection mold according to claim 1, wherein a driving seat (20) is fixedly assembled on the left side of the movable mold seat (10), guide pins (30) matched with the movable mold seat (10) are fixed on four corners of the driving seat (20), a fixed mold seat (40) is assembled on the right side of the movable mold seat (10), an injection mold seat (50) is assembled on the right side of the fixed mold seat (40), and a protection seat (60) is fixedly installed on the right side of the injection mold seat (50).
  9. 9. The flip-chip ejection structure of an injection mold according to claim 1, wherein the movable mold base (10) is provided with a liquid cooling runner (90) matching with the core insert (70).

Description

Flip-chip demolding structure of injection mold Technical Field The invention relates to the technical field of injection mold stripping, in particular to a flip-chip mold stripping structure of an injection mold. Background The inverted mold is a special structure in the injection mold relative to the conventional normal mold, and is characterized in that the installation positions of a cavity and a core, a pouring system and an ejection mechanism are arranged and are completely reversed to the normal mold, and when the injection mold is ejected, a push rod is mainly used for pushing out the injection molded product, so that after the upper mold and the lower mold are completely separated, the push rod is required to push the injection molded product after the upper mold stops moving. In an injection mold convenient for rapid demolding, the application number is CN202321237645.8, a driving piece is used for simultaneously driving an upper die plate to be away from a lower die plate and a pushing piece to push out an injection molding product outwards, a blowing piece is used for blowing and pressurizing a sealed cavity formed by the bottom of the injection molding product and the inner wall of the injection molding cavity, and the sealed cavity is formed after the pushing piece pushes out the injection molding product outwards to separate the injection molding product from the inner wall of the injection molding cavity. However, in the actual use process, after the flip-chip die is opened, the appearance surface of the product is completely attached to the movable die cavity, the packing force is from the cooling shrinkage packing force and the vacuum adsorption force between the cavity and the product, the product is pushed against the double resistance force by force in the traditional ejection, in addition, the traditional ejector pins, the ejector blocks and the push plates are rigidly and forcedly contacted and ejected, the ejection force is necessarily concentrated in a local contact area, irreversible elastic compression deformation occurs in the contact area during ejection, and the integrity and the attractiveness of the product are damaged. Therefore, the present invention provides a flip-chip demolding structure of an injection mold to solve the above-mentioned problems. Disclosure of Invention The invention aims to provide a flip-chip demolding structure of an injection mold, which aims to solve the problems in the background technology. The flip-chip demolding structure of the injection mold comprises a core insert arranged on a movable mold base, wherein the core insert comprises an outer core, an inner core is fixedly arranged in the outer core, movable ejection pieces are uniformly distributed on the outer side of the inner core along the circumferential direction, and the outer surface of each ejection piece is flush with the surface of the inner core; The outer side wall of the inner core is provided with a storage groove for storing the ejection piece, and the inner side wall of the storage groove is provided with a guide groove; a guide post which is assembled in the guide groove in a sliding way is fixed on the side wall of the ejection piece, an electromagnet block is fixed at the other end of the inner cavity of the guide groove, and a reset spring is fixedly connected between the guide post and the electromagnet block; The periphery of the outer core is provided with a pre-release adhesive component which is arranged on the movable die holder, the pre-release adhesive component comprises an annular air passage which is arranged in the movable die holder, and a static pressure air inlet hole which is communicated with the annular air passage is arranged on the surface of the movable die holder and positioned at the outer side of the outer core. Preferably, the ejector members are arranged in four groups, the size of each group of ejector members is completely matched with the size of the containing groove, and the outer surface of each ejector member is a main parting surface. Preferably, the surface of each ejection piece adopts profiling flexible supporting silica gel, and the surface of the ejection piece is a profiling surface which is completely fit with the contour of the inner surface of the product. Preferably, the outer core is embedded on the surface of the movable die holder, and the air outlet of the static pressure air inlet is opposite to the surface of the outer core. Preferably, the surface of the movable die holder is arranged at the outer side of the outer die core to form a secondary parting surface, a sealing ring is fixedly nested in the secondary parting surface, and the sealing ring is arranged at the outer side of the static pressure air inlet hole. Preferably, an annular sealing groove is formed in the auxiliary parting surface, the sealing rings are assembled in the sealing groove in a nested mode, a gas storage cavity is reserved between the sealing rings a