CN210820556U

CN210820556U - Structure for eliminating flow marks at rib position of injection molding part

Info

Publication number: CN210820556U
Application number: CN201921301512.6U
Authority: CN
Inventors: 魏佳; 王昌威; 赵林; 朱叶琪
Original assignee: HASCO Vision Technology Co Ltd
Current assignee: HASCO Vision Technology Co Ltd
Priority date: 2019-08-12
Filing date: 2019-08-12
Publication date: 2020-06-23
Anticipated expiration: 2029-08-12

Abstract

The utility model relates to a structure for eliminating injection molding rib position department flow mark belongs to working of plastics injection moulding field. The rib position structure comprises a rib position body protruding outwards from the surface of the main body wall, the rib position body is attached to the surface of the main body wall, a notch is formed in the surface of the main body wall, and one side wall of the notch is flush with the surface of the main body wall. The utility model discloses in muscle position structure application scope wide, the configuration optimization is simple and easy, and need not optimize injection moulding process, labour saving and time saving.

Description

Structure for eliminating flow marks at rib position of injection molding part

Technical Field

The utility model relates to a working of plastics injection moulding field, in particular to a structure for eliminating injection molding rib position department flow mark.

Background

The flow mark defect of the injection molding part is an appearance defect that a fold shape formed on the surface of the product along the flow direction is similar to a weld line because the product is broken by compressed gas trapped in a local structure in the filling process to the flow front of a plastic melt.

The injection molding part inevitably has some rib structures to play a role in strengthening or positioning. Generally, to avoid sink marks caused by the rib, the wall thickness T1 of the rib is smaller than the wall thickness T2 of the main body, as shown in fig. 1. The cross section at the rib position is shown in fig. 2, because T1 < T2, the shape of the flow front of the plastic melt flowing through the rib position is shown as a dotted line in fig. 3, namely the flow speed of the melt at the rib position is slower than that at the wall thickness of the main body, air trapping is formed at the rib position at the moment the flow front flows through the rib position, and the separation between the air trapping area and the flow front at the wall thickness of the main body is only realized by one edge of the rib position of the area circled in fig. 2.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the above-mentioned problem, provide a structure for eliminating injection molding rib position department flow trace, can eliminate the flow trace of rib position department.

The purpose of the utility model is realized like this:

the utility model provides a structure for eliminating injection molding muscle position department flow mark, muscle position structure includes the muscle position body of stretching from the surface of main part wall to the evagination, muscle position body laminating the surface department of main part wall is equipped with the breach, a lateral wall of breach with the surface of main part wall flushes.

Preferably, the main body wall is provided with a bend, two adjacent edges of the rib position body are respectively attached to the surfaces of the main body walls on two sides of the bend, the plastic melt flows from one end of the main body wall to the other end of the main body wall, the protruding extending direction of the rib position body is opposite to or the same as the flowing direction of the plastic melt, and the notch is formed in the top of the rib position body along the flowing direction of the plastic melt.

Preferably, the width of the notch is smaller than the width of the rib position body, but not smaller than half of the width of the rib position body.

Preferably, the depth of the notch is smaller than the height of the rib position body, but not smaller than one third of the height of the rib position body.

The utility model has the advantages that: the structure has wide application range, simple and feasible structure optimization, time saving and labor saving, and does not need to optimize the injection molding process.

Drawings

FIG. 1 shows a rib structure diagram of an injection molded part with flow mark defects;

FIG. 2 shows a cross-sectional view of the rib site structure of FIG. 1;

FIG. 3 shows a melt flow front structure at the rib site structure of FIG. 1;

FIG. 4 shows a structure diagram of the melt flow front at the structure for eliminating flow marks at the rib position of an injection molding part in the invention;

fig. 5 shows a cross-sectional view of a structure for eliminating flow marks at rib positions of injection molding parts in the present invention.

Detailed Description

Various embodiments of the present invention will be described with reference to the accompanying drawings. In the specification and drawings, elements having similar structures or functions will be denoted by the same reference numerals. It is to be understood that the drawings are designed solely for the purposes of illustration and description and not as a definition of the limits of the invention. The dimensions shown in the figures are for clarity of description only and are not intended to be limiting, nor are they intended to be exhaustive or to limit the scope of the invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

As shown in FIG. 4, the structure for eliminating flow marks at the rib position of the injection molding part comprises a rib position body 2 protruding outwards from the surface of a main body wall 1, a notch 3 is arranged at the position, attached to the surface of the main body wall 1, of the rib position body 2, and one side wall of the notch 3 is flush with the surface of the main body wall 1.

By adopting the structure, when the plastic melt flows along the rib position body 2, the plastic melt firstly contacts the bottom surface of the notch 3 on the rib position body 2 to form a wider sealing material area (see a circled part in fig. 4), so that the melt filling the rib position body 2 part and the melt filling the main body wall 1 part can be well separated.

Specifically, the surface of the main body wall 1 is provided with a bend, two adjacent sides of the rib position body 2 are respectively attached to the surfaces of the main body walls 1 on two sides of the bend, the plastic melt flows from one end of the main body wall 1 to the other end of the main body wall 1, the protruding direction of the rib position body 2 is opposite to or the same as the flow direction of the plastic melt (the arrow direction in fig. 1-5), and the notch 3 is arranged at the top of the rib position body 2 along the flow direction of the plastic melt.

In order to avoid that the trapped gas is rapidly compressed in a short time and rushes out from the sealing material area to the appearance area (main wall part), the width of the notch 3 is generally smaller than the width of the rib body 2 but not smaller than half of the width of the rib body 2, namely, as shown in fig. 5 and 2, the width W1 of the rib body 2 meets 1/2W ≦ W1 < W. The depth of the notch 3 is less than the height of the rib body 2, but not less than one third of the height of the rib body 2, that is, as shown in fig. 5 and 2, the height H1 of the rib body 2 satisfies 1/3H ≦ H1 ≦ H.

Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims

1. The utility model provides a structure for eliminating injection molding muscle position department flow mark, its characterized in that, muscle position structure includes the muscle position body of stretching from the surface of main part wall to the evagination, the laminating of muscle position body the surface department of main part wall is equipped with the breach, a lateral wall of breach with the surface of main part wall flushes.

2. The structure for eliminating the flow marks at the rib positions of the injection molding part according to claim 1, wherein the main body wall is provided with a bend, two adjacent edges of the rib position body are respectively attached to the surfaces of the main body walls at two sides of the bend, the plastic melt flows from one end of the main body wall to the other end of the main body wall, the protruding direction of the rib position body is opposite to or the same as the flow direction of the plastic melt, and the notch is formed in the top of the rib position body along the flow direction of the plastic melt.

3. The structure for eliminating flow marks at the rib position of an injection molding part according to claim 1, wherein the width of the notch is smaller than the width of the rib position body but not smaller than half of the width of the rib position body.

4. The structure for eliminating flow marks at the rib position of an injection molding part according to claim 1, wherein the depth of the notch is less than the height of the rib position body but not less than one third of the height of the rib position body.