CN112536988B

CN112536988B - Demoulding device of formula of hiding runner

Info

Publication number: CN112536988B
Application number: CN202011313000.9A
Authority: CN
Inventors: 夏庆雷; 王佳; 张琴; 吴阳春; 徐海峰
Original assignee: Dongfeng Motor Corp
Current assignee: Dongfeng Motor Corp
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2022-02-01
Anticipated expiration: 2040-11-20
Also published as: CN112536988A

Abstract

A demoulding device of a submarine gate relates to the field of mould devices. The demolding device for the submarine gate comprises a cold runner with the submarine gate and at least one ejector rod hole and ejector rods arranged in the ejector rod holes respectively, wherein the top of each ejector rod is provided with an ejection part extending to the surface of the cold runner, and the cross section of each ejection part is polygonal. The application provides a shedder of formula of hiding runner is through canceling draft angle and setting up the ejecting portion that the cross section is polygon, can guarantee on the one hand that the ejector pin is stable ejecting in the cold runner residual polymer avoid the bullet to fly away, and on the other hand can reduce the cohesion between ejecting portion and the ejector pin hole to the separation of ejector pin and cold runner.

Description

Demoulding device of formula of hiding runner

Technical Field

The application relates to the field of mold devices, in particular to a demolding device for a submarine gate.

Background

When injection molding is carried out, the influence of the structure, the appearance and the production convenience of a part of injection molded parts is caused, the injection molded parts are obtained by using the submarine gate, the appearance of the product obtained by processing the submarine gate is free from gate marks, and the gate is automatically separated from the product after ejection and demolding without manual trimming.

As shown in fig. 1, 2, 3 and 4, which are schematic views of a mold structure in a conventional submarine gate injection molding process, in a normal production process, a polymer material enters a mold cavity through a cold runner 100 and a submarine gate 110 to form a product 200. After the mold is opened, the product 200 is separated from the submarine gate 110, and the submarine gate 110 and the cold runner 100 are positioned on the top bar 130 and taken out together when the product is taken out by the manipulator, so as to be ready for the next injection molding cycle. In the above production process, when the ejector pin 130 is ejected along the ejector pin hole 120, the residual polymer in the submarine gate 110 is demolded depending on the deformation of the front end, so that springback occurs after the submarine gate 110 is ejected (as shown in fig. 2 and 3), and if the cold runner 100 is insufficiently positioned, the residual polymer in the submarine gate 110 flies away from the ejector pin 130 and falls into the mold, thereby resulting in film pressing; if the cold runner 100 is positioned too strongly, the residual polymer in the submarine gate 110 is very easy to be taken out, and when the existing submarine gate is demolded, the demolding angle α of the ejector rod 130 is usually 0 ° to 5 °, and the positioning depth L is 8mm to 20mm according to experience, so that the above two conditions are easy to occur, and the automatic production is not facilitated.

Disclosure of Invention

An object of this application is to provide a shedder of formula of hiding runner, it can guarantee that the ejector pin is stable in the ejecting cold runner residual polymer avoid the bullet to fly away, and can reduce the cohesion between ejecting portion and the ejector pin hole to the separation of ejector pin and cold runner.

The embodiment of the application is realized as follows:

the embodiment of the application provides a shedder of formula of hiding runner, and it includes the cold runner that has formula of hiding runner and at least one ejector pin hole and locates the ejector pin in each ejector pin hole respectively, and the top of ejector pin has the ejecting portion that extends to the cold runner surface, and the cross section of ejecting portion is the polygon.

In some alternative embodiments, the height L of the ejection portion and the depth H of the submarine gate satisfy the following requirements: l is more than or equal to 1.5H.

In some alternative embodiments, the distance f between the outer wall of the ejector part and the inner wall of the ejector rod hole meets the following requirement: f ∈ (0, 0.20] mm.

In some alternative embodiments, the distance f between the outer wall of the ejector part and the inner wall of the ejector rod hole meets the following requirement: f is equal to 0.05, 0.20 mm.

In some alternative embodiments, the cross-section of the ejection portion is a polygon with three or more sides.

The beneficial effect of this application is: the demolding device for the submarine gate provided by the embodiment comprises a cold runner with the submarine gate and at least one ejector rod hole and ejector rods arranged in the ejector rod holes respectively, wherein the top of each ejector rod is provided with an ejection part extending to the surface of the cold runner, and the cross section of each ejection part is polygonal. The shedder of formula of hiding runner that this embodiment provided is through canceling the draft angle and setting up the ejecting portion that the cross section is polygon, can guarantee on the one hand that the ejector pin is stable ejecting in the cold runner residual polymer avoid the bullet to fly away, and on the other hand can reduce the cohesion between ejecting portion and the ejector pin hole to the separation of ejector pin and cold runner.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a schematic view of a conventional submarine gate injection molding operation;

FIG. 2 is a schematic structural diagram of a conventional submarine gate injection molding operation before ejection of a carrier rod;

FIG. 3 is a schematic structural diagram of a conventional submarine gate injection molding operation after ejection of an ejector pin;

FIG. 4 is a schematic view of a partially enlarged structure of a carrier rod in a carrier rod hole during a conventional submarine gate injection molding operation;

fig. 5 is a schematic perspective view of a mold release device for a submarine gate according to an embodiment of the present disclosure;

FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5;

fig. 7 is a sectional view taken along line B-B in fig. 5.

In the figure: 100. a cold runner; 110. a submarine gate; 120. a jack rod hole; 130. a top rod; 140. a push-out part; 200. and (5) producing the product.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when in use, and are used only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The features and properties of the mold release device for a submarine gate according to the present invention will be described in further detail with reference to examples.

As shown in fig. 5, 6 and 7, an embodiment of the present application provides a submarine gate demolding device, which includes a cold runner 100 having a submarine gate 110 and two ejector rod holes 120, and ejector rods 130 respectively disposed in the two ejector rod holes 120, wherein the top of the ejector rod 130 has an ejector part 140 extending to the surface of the cold runner 100, and the cross section of the ejector part 140 is square; the height L of the ejector 140 and the depth H of the submarine gate 110 satisfy the following requirements: l is more than or equal to 1.5H, in the embodiment, L is 12mm, and H is 8 mm; the distance f between the outer wall of the ejector part 140 and the inner wall of the ejector rod hole 120 meets the following requirement: f is equal to [0.05, 0.20] mm, the distance between the four corners of the ejection part 140 and the inner wall of the ejector rod hole 120 is 0.05mm, and the distance between the middle points of the four sides of the ejection part 140 and the inner wall of the ejector rod hole 120 is 0.2 mm.

In the demolding device for a submarine gate provided by the embodiment, the ejector part 140 extending to the surface of the cold runner 100 is arranged at the top of the ejector rod 130, the cross section of the ejector part 140 is square, and the distance f between the outer wall of the ejector part 140 and the inner wall of the ejector rod hole 120 meets the following requirements: f belongs to [0.05, 0.20] mm, the thickness of the adhesive films on the four corners of the ejection part 140 of the ejector rod 130 and the inner wall of the ejector rod hole 120 can be effectively controlled, the thinner adhesive position between the four corners of the ejection part 140 and the inner wall of the ejector rod hole 120 is guaranteed to deform or even crack due to stress concentration when the ejector rod 130 is ejected, so that the bonding force between the ejector rod 130 and the cold runner 100 is reduced, the cold runner can be conveniently taken out, meanwhile, by canceling a demoulding angle and setting the height L of the ejection part 140 and the depth H of the latent gate 110 to meet the condition that L is more than or equal to 1.5H, the stress when the ejector rod 130 ejects the ejection part 140 can be controlled to drive the residual polymer in the latent gate 110 to be separated, the die pressing risk caused by elastic flying in the demolding process is avoided, the service life of the die is prolonged, and the requirement of automatic continuous production is met.

In other alternative embodiments, the distance f between the outer wall of the ejector 140 and the inner wall of the ejector pin hole 120 satisfies the following requirement: f e is (0, 0.20) mm, gaps are formed between the four corners of the ejection part 140 and the inner wall of the ejector rod hole 120 without contacting, and the maximum distance between the outer wall of the ejection part 140 and the inner wall of the ejector rod hole 120 is not more than 0.2 mm.

The embodiments described above are some, but not all embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Claims

1. The demolding device for the submarine gate comprises a cold runner with the submarine gate and at least one ejector rod hole and ejector rods arranged in the ejector rod holes respectively, and is characterized in that the top of each ejector rod is provided with an ejection part extending to the surface of the cold runner, the cross section of the ejection part is polygonal, and the height L of the ejection part and the depth H of the submarine gate meet the following requirements: l is more than or equal to 1.5H; the distance f between the outer wall of the ejection part and the inner wall of the ejector rod hole meets the following requirements: f is equal to 0.05, 0.20 mm.

2. The gate-concealed ejector according to claim 1, wherein the cross section of the ejector is a polygon having three or more sides.