CN110614745A

CN110614745A - Rapid gas-assisted forming precision injection molding process for ABS alloy injection molding part

Info

Publication number: CN110614745A
Application number: CN201910936568.7A
Authority: CN
Inventors: 宣珠萍; 宣丹萍
Original assignee: Taicang Yixin Intelligent Technology Co Ltd
Current assignee: Taicang Yixin Intelligent Technology Co Ltd
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2019-12-27

Abstract

A rapid gas-assisted forming precision injection molding process for ABS alloy injection molding parts comprises the following steps: an injection molding stage, an inflation stage, a pressure maintaining stage and a demolding stage, wherein the injection molding stage is to heat the plastic to a melting state of 240-300 ℃, inject the plastic into a mold cavity through an injection molding machine, and inject the plastic into the mold cavity by 85-95%; the inflation stage is that after the injection molding stage is finished, the delay is 0.3 to 1S, nitrogen is inflated into the cavity through the gas auxiliary equipment, and the plastic is pushed by the nitrogen to continuously fill the whole cavity; in the pressure maintaining stage, the gas auxiliary equipment is closed, so that nitrogen is released after the nitrogen is kept in the cavity for 5-15 seconds; the demolding stage is to release the article from the mold cavity. The rapid gas-assisted forming precise injection molding process for the ABS alloy injection molding part saves materials, improves the surface quality, increases the gas-assisted forming qualification rate and reduces the production cost.

Description

Rapid gas-assisted forming precision injection molding process for ABS alloy injection molding part

Technical Field

The invention belongs to the technical field of injection molding, and particularly relates to a rapid gas-assisted molding precision injection molding process for an ABS alloy injection molding piece.

Background

Plastic products are increasingly applied to our lives, the variety of the plastic products is wide, the demand is higher, and therefore higher requirements are put forward on the manufacturing of the plastic products. The gas-assisted injection molding technology is one of injection molding methods, and compared with the traditional injection molding technology, the gas-assisted injection molding technology has the advantages of reducing raw materials, reducing the weight of a product, reducing mold locking force, improving the surface quality of the product, reducing or eliminating residual stress and the like. However, while having these many advantages, the requirements for process control in the actual production process are also increased, such as fluctuation of parameters such as temperature, pressure, time, etc., improper design of air passages, improper injection molding amount control, etc., which may cause serious quality problems and increase of rejection rate, so that the gas-assisted molding process needs to be improved to make up for the deficiency.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide a rapid gas-assisted forming precise injection molding process for ABS alloy injection molding parts, which saves materials, improves the surface quality, increases the gas-assisted forming qualification rate and reduces the production cost.

The technical scheme is as follows: the invention provides a rapid gas-assisted forming precision injection molding process for an ABS alloy injection molding part, which comprises the following steps: an injection molding stage, an inflation stage, a pressure maintaining stage and a demolding stage, wherein the injection molding stage is to heat the plastic to a melting state of 240-300 ℃, inject the plastic into a mold cavity through an injection molding machine, and inject the plastic into the mold cavity by 85-95%; the inflation stage is that after the injection molding stage is finished, the delay is 0.3 to 1S, nitrogen is inflated into the cavity through the gas auxiliary equipment, and the plastic is pushed by the nitrogen to continuously fill the whole cavity; in the pressure maintaining stage, the gas auxiliary equipment is closed, so that nitrogen is released after the nitrogen is kept in the cavity for 5-15 seconds; the demolding stage is to release the article from the mold cavity. The rapid gas-assisted forming precise injection molding process for the ABS alloy injection molding part saves materials, improves the surface quality, increases the gas-assisted forming qualification rate and reduces the production cost.

Further, in the rapid gas-assisted forming precision injection molding process for the ABS alloy injection molding piece, the mold is preheated to 50-100 ℃ at the beginning of the injection molding stage. The shrinkage rate is stabilized, and the dimensional accuracy and the surface quality are improved.

Further, in the rapid gas-assisted molding precision injection molding process for the ABS alloy injection molding piece, the injection molding pressure in the injection molding stage is 80-120 Mpa. Ensure that the plastic can enter the cavity quickly.

Further, in the rapid air-assisted molding precision injection molding process for the ABS alloy injection molding piece, the inflation pressure in the inflation stage is 30-35 Mpa. The gas part is ensured to break through the surface of the product, and the inside of the plastic is provided with gas with ideal volume.

Further, according to the rapid gas-assisted molding precision injection molding process for the ABS alloy injection molding piece, the purity of the nitrogen filled in the gas filling stage is 98%. The 98% nitrogen has low manufacturing cost and high cooling effect.

Furthermore, in the rapid air-assisted molding precision injection molding process for the ABS alloy injection molding piece, the direction of an air nozzle for inflating in the inflation stage is the same as the flowing direction of plastic. The plastic can be filled in the whole cavity without breaking the surface of the product.

Further, in the rapid gas-assisted molding precision injection molding process for the ABS alloy injection molding piece, the nitrogen gas release time in the pressure maintaining stage is 3-5S. Preventing the product from blasting when the die is opened.

Further, in the rapid gas-assisted molding precision injection molding process for the ABS alloy injection molding, the demolding stage is demolding by adopting an ejector rod or demolding by adopting a stripper plate. Simple structure and easy manufacture and use.

The technical scheme shows that the invention has the following beneficial effects: the rapid gas-assisted forming precise injection molding process for the ABS alloy injection molding part saves materials, improves the surface quality, increases the gas-assisted forming qualification rate and reduces the production cost. Has high popularization value.

Drawings

FIG. 1 is a process flow diagram of the rapid gas-assisted molding precision injection molding process for ABS alloy injection molded parts according to the present invention;

in the figure: 1 injection molding stage, 2 inflation stage, 3 pressure maintaining stage and 4 demolding stage.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; 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 meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. 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.

Example 1

The rapid air-assisted molding precision injection molding process for the ABS alloy injection molding part shown in FIG. 1 comprises the following steps: injection molding stage 1, inflation stage 2, pressure maintaining stage 3 and demolding stage 4. The injection molding stage 1 comprises preheating a mold to 50-100 ℃ in the first phase, simultaneously heating plastic to a molten state of 240-300 ℃, injecting the plastic into a mold cavity through an injection molding machine at an injection pressure of 80-120Mpa, and injecting the plastic into the mold cavity by 85% -95%; the inflation stage 2 is that after the injection molding stage 1 is finished, the delay is 0.3-1S, nitrogen with the purity of 98% is inflated into the cavity through gas auxiliary equipment at the pressure of 30-35Mpa, the direction of an air nozzle is the same as the flowing direction of plastic, and the plastic is pushed by the nitrogen to continuously fill the whole cavity; the pressure maintaining stage 3 is to close the gas auxiliary equipment, so that nitrogen is released after the nitrogen is kept in the cavity for 5-15 seconds, and the release time is 3-5 seconds; and the demolding stage 4 is to demold the product from the mold cavity by using an ejector rod or a stripper plate.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.

Claims

1. A rapid gas-assisted forming precision injection molding process for ABS alloy injection molding parts is characterized by comprising the following steps: the injection molding method comprises an injection molding stage (1), an inflation stage (2), a pressure maintaining stage (3) and a demolding stage (4), wherein in the injection molding stage (1), plastic is heated to a melting state of 240-300 ℃, and is injected into a mold cavity through an injection molding machine, and the plastic is injected into the mold cavity by 85-95%; the inflation stage (2) is that after the injection molding stage (1) is finished, the delay is 0.3-1S, nitrogen is inflated into the cavity through gas auxiliary equipment, and the whole cavity is continuously filled with plastic under the pushing of the nitrogen; the pressure maintaining stage (3) is to close the gas auxiliary equipment, so that nitrogen is released after the nitrogen is kept in the cavity for 5-15S; and the demolding stage (4) is to separate the product from the mold cavity.

2. The rapid gas-assisted precision injection molding process for ABS alloy injection molded parts according to claim 1, characterized in that the mold is preheated to 50-100 ℃ at the beginning of the injection molding phase (1).

3. The rapid gas-assisted precision injection molding process for ABS alloy injection molded parts according to claim 2, characterized in that the injection pressure in the injection molding stage (1) is 80-120 MPa.

4. The rapid gas-assisted precision injection molding process for ABS alloy injection-molded parts according to claim 1, wherein the inflation pressure of the inflation stage (2) is 30-35 Mpa.

5. The rapid gas-assisted precision injection molding process for ABS alloy injection molded parts according to claim 4, characterized in that the purity of the nitrogen gas filled in the gas filling stage (2) is 98%.

6. The rapid air-assisted forming precision injection molding process for ABS alloy injection molding parts according to claim 5, characterized in that the direction of the air nozzles inflated in the inflation stage (2) is the same as the plastic flowing direction.

7. The rapid gas-assisted molding precision injection molding process for ABS alloy injection moldings as claimed in claim 1, characterized in that the nitrogen gas emission time of the pressure maintaining stage (3) is 3-5S.

8. The rapid gas-assisted molding precision injection molding process for ABS alloy injection-molded parts according to claim 1, characterized in that the demolding stage (4) is demolding by using a push rod or a stripper plate.