CN-224210411-U - Injection mold with insert retreating structure

CN224210411UCN 224210411 UCN224210411 UCN 224210411UCN-224210411-U

Abstract

The utility model discloses an injection mold with an insert retreating structure, which comprises an upper mold base, a static mold plate, a movable mold plate, a lower mold base, an upper mold core, a lower mold core, a push rod assembly, an insert column body and an insert push rod. The upper and lower mold cores are arranged between the static and movable mold plates to form a mold cavity, the top of the insert column body is provided with a molding head matched with the deep cavity of the product, the bottom of the insert column body is rigidly connected with the lower mold base through a fixing plate, a through ejection hole is formed in the insert column body, one end of an insert ejector rod is connected with the ejection movable plate, and the other end of the insert ejector rod penetrates through the ejection hole and the fixing plate. The mold is fixedly connected with the fixing plate through the insert column body, the insert column body is separated from the deep cavity of the product to release the holding force during mold separation, then the ejector rod assembly and the insert ejector rod are used for ejecting the product cooperatively, the problem that the product is deformed due to the holding force during deep cavity product demolding is solved, the appearance quality and the dimensional accuracy of the product are improved, the defective percentage is reduced, meanwhile, the demolding is enabled to be more stable and smooth, and the production efficiency is improved.

Inventors

LI TONG
ZHU YAOLEI
LIU XIAOJUN

Assignees

乐清瑞风精密模具有限公司

Dates

Publication Date: 20260508
Application Date: 20250513

Claims (6)

1. The injection mold with the insert retreating structure comprises an upper mold seat, a static mold plate, a movable mold plate, a lower mold seat, an upper mold core, a lower mold core and a push rod assembly, wherein the upper mold core and the lower mold core are arranged between the static mold plate and the movable mold plate, a mold cavity for molding a product is arranged between the static mold plate and the movable mold plate, the push rod assembly comprises a push-out movable plate and a push rod connected with the push-out movable plate, and the injection mold is characterized by also comprising an insert cylinder and an insert push rod, the top of the insert cylinder is provided with a molding head matched with the deep cavity shape of the product, and the bottom of the insert cylinder is rigidly connected with the lower mold seat through a fixing plate; The inside ejecting hole that link up that is provided with of inserts cylinder, inserts ejector pin one end is connected with ejection movable plate, and the other end slidable passes fixed plate and above-mentioned ejecting hole.
2. The injection mold with the insert retreating structure according to claim 1, wherein the insert column comprises an upper insert and a lower insert, and the end parts of the upper insert and the lower insert, which are connected with each other, are provided with an embedding structure, and the embedding structure comprises an embedding groove at the end part, an embedding convex step at the upper end and the lower end of the embedding groove, and an embedding notch at the left end and the right end of the embedding groove.
3. The injection mold with the insert retracting structure according to claim 1, wherein the fixing plate is provided with a positioning groove for embedding and installing the lower insert.
4. The injection mold with the insert retreating structure of claim 3, wherein the bottom wall of the positioning groove, the upper insert and the lower insert are provided with long bolt holes, and the upper insert and the lower insert are fixedly connected with the fixing plate, the upper insert and the lower insert through the long bolts after being embedded into the positioning groove.
5. The injection mold with the insert-withdrawing structure of claim 1, wherein at least four ejection holes are formed, and the ejection holes are uniformly distributed circumferentially with the center of the insert column as a center.
6. The injection mold with the insert-backing structure of claim 5, wherein the plurality of ejector rod assemblies are uniformly distributed on the outer ring of the insert ejector rod by taking the center of the insert cylinder as the center of a circle.

Description

Injection mold with insert retreating structure Technical Field The utility model relates to the technical field of injection molds, in particular to an injection mold with an insert retreating structure. Background In the field of injection molds, for injection molding of products provided with deep cavity structures, it is often necessary to provide inserts in the mold to form the deep cavity shape of the product. However, the deep cavity structure enables the contact area between the insert and the inner wall of the product to be obviously increased, so that the holding force between the insert and the inner wall of the product is too strong. In the prior art, the ejector rod assembly is usually only relied on to eject and demold the product. But in the demoulding process after injection molding of the deep cavity products, as the holding force between the insert and the inner wall of the products is too large, when the products are ejected out only through the outer ejector rods, the products are extremely easy to dent or deform due to uneven local stress, the appearance quality and the dimensional accuracy of the products are seriously affected, the defective rate is increased, and the production efficiency is reduced. Therefore, there is a need for an injection mold structure that can effectively solve the problem of product deformation caused by the holding force during the demolding of deep cavity products. Disclosure of utility model The utility model provides an injection mold with an insert retreating structure aiming at the defects in the background technology. The injection mold with the insert retreating structure comprises an upper mold seat, a static mold plate, a movable mold plate, a lower mold seat, an upper mold core, a lower mold core and a push rod assembly, wherein the upper mold core and the lower mold core are arranged between the static mold plate and the movable mold plate, a mold cavity for molding a product is arranged between the static mold plate and the movable mold plate, the push rod assembly comprises a push-out movable plate and a push rod connected with the push-out movable plate, the injection mold also comprises an insert cylinder and an insert push rod, the top of the insert cylinder is provided with a molding head matched with the deep cavity of the product in shape, and the bottom of the insert cylinder is rigidly connected with the lower mold seat through a fixed plate; The inside ejecting hole that link up that is provided with of inserts cylinder, inserts ejector pin one end is connected with ejection movable plate, and the other end slidable passes fixed plate and above-mentioned ejecting hole. Further, the insert column body comprises an upper insert and a lower insert, the end parts of the upper insert and the lower insert, which are connected with each other, are provided with an embedded structure, and the embedded structure comprises an embedded groove at the end part, embedded convex steps at the upper end and the lower end of the embedded groove and embedded notches at the left end and the right end of the embedded groove. Further, a positioning groove for embedding and installing the lower insert is formed in the fixing plate. Further, the locating groove bottom wall, the upper insert and the lower insert are provided with long bolt holes, and the fixing plate, the upper insert and the lower insert are fixedly connected through the long bolts after the upper insert and the lower insert are embedded into the locating groove. Further, the number of the ejection holes is at least four, and the ejection holes are uniformly distributed by taking the center of the insert cylinder as the circle center. Further, the ejector rod assemblies are multiple, and the ejector rod assemblies are uniformly distributed on the outer ring of the insert ejector rod by taking the center of the insert cylinder as the circle center. The beneficial effects of the utility model are as follows: firstly, through the fixed plate rigid connection with inserts cylinder and die holder, when the die separation, the inserts body can follow the separation of fixed plate from the dark chamber of product, releases the too big cohesion between inserts and the product inner wall in advance, has effectively avoided only relying on the ejecting product of outside ejector pin, because of the indent or the deformation problem that the local atress is uneven produces, has greatly promoted the appearance quality and the dimensional accuracy of product, has reduced the defective percentage. Secondly, set up the ejecting hole that link up in inserts cylinder inside to cooperation inserts ejector pin and ejector pin subassembly synergism improves the homogeneity of drawing of patterns atress, makes product drawing of patterns process more steady, smooth and easy, avoids appearing presenting the problem that the product warp because the ejector pin ejection force is inhomogeneous. In addition to the obj