CN215825849U

CN215825849U - Mould suitable for PFA material

Info

Publication number: CN215825849U
Application number: CN202121654220.8U
Authority: CN
Inventors: 常中东; 徐力; 沈凯桦
Original assignee: Shanghai Zhichun Precision Manufacturing Co ltd
Current assignee: Shanghai Zhichun Precision Manufacturing Co ltd
Priority date: 2021-07-20
Filing date: 2021-07-20
Publication date: 2022-02-15
Anticipated expiration: 2031-07-20

Abstract

The utility model provides a mold suitable for PFA materials, which comprises a mold core, wherein a fixed seat for stably fixing the mold core is fixedly arranged on the outer side of the mold core, an injection molding cavity for injection molding is arranged in the mold core, the injection molding cavity is communicated with the outside through a glue inlet, and a quick glue injection pipe is arranged in the glue inlet; quick injecting glue pipe is including advancing rubber tube and a plurality of shunt tubes of mutual intercommunication, the shunt tubes intercommunication is provided with the injecting glue mouth, and is a plurality of the injecting glue mouth all sets up with the die cavity intercommunication of moulding plastics, the minimum cross sectional area of injecting glue mouth all is greater than ten percent with advancing the minimum cross sectional area of rubber tube. According to the utility model, the liquid PFA material is injected into the injection molding cavity through the plurality of glue inlets, the area of the glue inlets is enlarged, the flow of the liquid PFA material is improved, the injection molding time of the PFA material is shortened, and the surface flatness of the cast molding element is improved.

Description

Mould suitable for PFA material

Technical Field

The utility model relates to the technical field of PFA material molds, in particular to a mold suitable for PFA materials.

Background

When transporting acid, alkali or medicine, a corrosion-resistant hydraulic component is needed for transportation, and a PFA material is usually used for producing the hydraulic component, but the PFA material is a fluorine-containing plastic, and is an injection molding material with poor fluidity after hot melting, when the PFA material is used for casting, the injection molding time is long, so that the surface flatness of a cast component is reduced, the surface precision of a sealing joint of the hydraulic component is affected, and further the sealing performance of the hydraulic component is reduced, therefore, a mold suitable for the PFA material is needed, the injection molding time of the PFA material can be shortened, and the surface precision of the cast component is improved.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a mold suitable for PFA material, which can improve the corrosion resistance of the mold and improve the flowability of the PFA material.

In order to solve the technical problems, the utility model adopts the technical scheme that:

a mold suitable for PFA materials comprises a mold core, wherein a fixing frame used for fixing the mold core is fixedly arranged on the outer side of the mold core, an injection molding cavity used for injection molding is arranged in the mold core, the injection molding cavity is communicated with the outside through a glue inlet, and a quick glue injection pipe is arranged in the glue inlet;

quick injecting glue pipe is including advancing rubber tube and a plurality of shunt tubes of mutual intercommunication, the shunt tubes intercommunication is provided with the injecting glue mouth, and is a plurality of the injecting glue mouth all sets up with the die cavity intercommunication of moulding plastics, the minimum cross sectional area of injecting glue mouth all is greater than ten percent with advancing the minimum cross sectional area of rubber tube.

Furthermore, the minimum cross-sectional area of the glue injection pipe and the minimum cross-sectional area of the glue inlet pipe account for ten percent to twenty percent.

Furthermore, the injection molding cavity is of a hydraulic component structure, and the hydraulic component comprises a sealing connection structure.

Further, the injection molding cavity comprises a diaphragm valve structure.

Furthermore, an anti-corrosion coating for increasing the flow rate of the PFA material is added on the surface of the injection molding cavity.

Further, the anticorrosive coating is a chromium coating.

The utility model has the advantages and positive effects that:

through increasing a plurality of shunt tubes on quick injecting glue pipe, the intercommunication is provided with the injecting glue mouth on a plurality of shunt tubes, a plurality of injecting glue mouths pour into liquid PFA material toward the die cavity of moulding plastics of mold core simultaneously during moulding plastics, accelerate the whole flow of moulding plastics, shorten the time of moulding plastics, simultaneously with the minimum cross sectional area of injecting glue mouth and advance the minimum cross sectional area of rubber tube and account for increasing to between ten percent to twenty percent, the area of injecting glue mouth cross-section has been increaseed, increase the flow of single injecting glue mouth department, further shorten the time of moulding plastics, thermal scattering and disappearing when reducing moulding plastics, and then improve the casting shaping back, the surface accuracy of shaping component.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a front cross-sectional view of a mold suitable for PFA material of the present invention;

FIG. 2 is a three-dimensional schematic view of a rapid injection molding tool for PFA material according to the present invention;

in the figure: 1. injection molding a cavity; 2. a glue inlet; 3. a fast glue injection pipe; 301. feeding a rubber tube; 302. a shunt tube; 303. a glue injection port; 4. and (5) a mold core.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The utility model provides a mould suitable for PFA materials, as shown in figures 1 to 2, which comprises a mould core 4, wherein a fixed seat for stably fixing the mould core 4 is fixedly arranged at the outer side of the mould core 4, an injection mould cavity 1 for injection moulding is arranged in the mould core 4, the mould core 4 is stably and fixedly arranged in the fixed seat before injection moulding, the mould core 4 is horizontally placed, liquid PFA materials are injected into the injection mould cavity 1, and the PFA materials are demoulded after being cooled, so that the production of one element is completed.

However, when the die core 4 is used for producing a hydraulic component, the hydraulic component needs to be connected with a pipeline, and when the pipeline is tightly matched with hydraulic pressure, the requirement on the surface precision of the hydraulic component is high in order to ensure the connection tightness. When the volume of the injection molding cavity 1 in the mold core 4 is large, the injection molding needs long time, the PFA material is easily cooled in advance, particularly, the PFA material is in contact with the surface of the injection molding cavity 1, the temperature difference of the direct contact part of the PFA material and the mold core 4 is large, the heat dissipation is fast, the PFA material is cooled in advance, and the forming mold has a rough surface and low surface precision.

For example: the die cavity 1 of moulding plastics is the valve body structure of diaphragm valve, and the valve body of diaphragm valve is including the base, and the base top is the circulation chamber, and there is the mounting groove of installation diaphragm on the top of circulation chamber, and the diaphragm is installed to the mounting groove fit-in, for the leakproofness of guaranteeing the diaphragm, need guarantee the surface precision of mounting groove, and the valve body of diaphragm valve still includes a plurality of connection structure of being connected with the pipeline, also need guarantee the surface precision of valve body.

Taking a diaphragm valve mold core 4 as an example: injection mold cavity 1 is through advancing jiao kou 2 and external intercommunication, advances jiao kou 2 and is located the bottom surface of diaphragm valve base, advances to install quick injecting glue pipe 3 in jiao kou 2, and quick injecting glue pipe 3 can be quick pours into injection mold cavity 1 with the liquid PFA material of high temperature into, reduces PFA material and looks at the thermal scattering and disappearing of in-process, and then improves the surface accuracy who forms the mould.

Quick injecting glue pipe 3 is including advancing rubber tube 301 and a plurality of shunt tubes 302 of mutual intercommunication, and shunt tubes 302 intercommunication is provided with injecting glue mouth 303, and is a plurality of injecting glue mouth 303 all sets up with the 1 intercommunication of the die cavity of moulding plastics, through a plurality of injecting glue mouths 303 toward injecting into liquid PFA material in the die cavity 1 of moulding plastics simultaneously in different positions for when the flow of moulding plastics, reduce the PFA material and at the distance of the interior flow of die cavity 1 of moulding plastics, the effectual time of moulding plastics that shortens.

The ratio of the minimum cross-sectional area of the glue injection port 303 to the minimum cross-sectional area of the glue inlet pipe 301 is more than ten percent, the minimum cross-sectional area of the glue injection port 303 is increased, the flow of a single glue injection port 303 is increased, the injection molding flow is further increased, the injection molding time is shortened, the heat loss of PFA materials during injection molding is reduced, and the surface precision of a forming mold is improved. Preferably, the minimum cross-sectional area of the glue injection pipe and the minimum cross-sectional area of the glue inlet pipe 301 account for ten percent to twenty percent, so that the volume of glue injection burrs left at a glue injection point is smaller after injection molding while the injection molding time is shortened, and the normal use of a molding die is not influenced.

However, the PFA material contains fluorine, which is corrosive and has poor fluidity, and the injection time around the column is increased, which affects the surface accuracy of the molded plastic mold. However, the fixed seat is installed on the outer side of the mold core 4, the mold core 4 is difficult to externally heat, the hot effect is not ideal, a layer of anticorrosive coating for increasing the flowability of the PFA material can be additionally arranged on the surface of the injection molding cavity 1, the flow rate of the PFA material in the injection molding cavity 1 is accelerated, the injection molding time is shortened, the surface precision of the forming mold is further improved, meanwhile, the anticorrosive coating can also prevent the PFA material from corroding the mold core 4, and the service life of the mold core 4 is prolonged.

Preferably, the anticorrosive coating is a chromium-plated layer, and the chromium-plated layer has a small friction coefficient, so that the flowability of the PFA material during injection molding can be improved, the injection molding speed is increased, and the flatness of the surface of the plastic component after chromium molding is further improved; the chromium coating has the lowest coefficient of friction among all metals in the coating, so the chromium coating also has good wear resistance and is not easy to damage the die during demolding. The chromium coating has good chemical stability, does not act in alkali, sulfide, nitric acid and most of organic acids, has strong corrosion resistance, avoids PFA material from corroding the wall of the injection molding cavity 11, and prolongs the service life of the mold.

The working principle and the working process of the utility model are as follows:

taking a die of a diaphragm valve as an example: before injection molding, a layer of chromium is plated on the surface of the injection molding cavity 1, so that the corrosion resistance of the injection molding cavity 1 is improved, a PFA material is prevented from corroding the mold core 4 in the injection molding process, the flowability of the PFA material on the surface of the injection molding cavity 1 is improved, and the speed of the liquid PFA material is accelerated; liquid PFA material is injected into the injection molding cavity 1 through the quick glue injection pipe 3, the liquid PFA material is divided by the quick glue injection pipe 3 through a plurality of drainage pipes, the liquid PFA material is injected into the injection molding cavity 1 through the plurality of drainage pipes at different positions of the injection molding cavity 1 through the plurality of glue injection ports 303, the flowing distance of the liquid PFA material during injection molding is reduced, and the injection molding time is further shortened.

Meanwhile, the ratio of the minimum cross-sectional area of the glue injection port 303 to the minimum cross-sectional area of the glue inlet pipe 301 is increased to be more than ten percent, so that the flow of a single glue injection port 303 is improved under the condition of using the same injection pressure, the injection molding time is further shortened, the surface precision of the diaphragm valve after molding is effectively improved, the sealing performance of the connection part of the diaphragm valve is further improved, and meanwhile, the production cost of the diaphragm valve is not influenced.

The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.

Claims

1. A mold suitable for PFA materials comprises a mold core (4), wherein a fixed seat used for fixing the mold core (4) is fixedly arranged on the outer side of the mold core (4), an injection molding cavity (1) is formed in the mold core (4), the injection molding cavity (1) is communicated with the outside through a glue inlet (2), and a quick glue injection pipe (3) is arranged in the glue inlet (2);

the fast glue injection pipe (3) is characterized by comprising a glue inlet pipe (301) and a plurality of shunt pipes (302) which are communicated with each other, wherein the shunt pipes (302) are communicated with glue injection ports (303) and are arranged in a manner that the glue injection ports (303) are communicated with an injection molding cavity (1), and the minimum section area of the glue injection ports (303) and the minimum section area of the glue inlet pipe (301) are larger than ten percent.

2. The mold for PFA material according to claim 1, wherein the minimum cross-sectional area of the injecting opening (303) is between ten percent and twenty percent of the minimum cross-sectional area of the injecting tube (301).

3. A mold for PFA material in accordance with claim 1, wherein the injection mold cavity (1) is of a hydraulic component structure, and the hydraulic component structure comprises a sealing connection structure.

4. A mould suitable for PFA material according to claim 3, wherein the injection mould cavity (1) comprises a diaphragm valve structure.

5. A mould suitable for PFA material according to any one of claims 1 to 4 wherein the injection mould cavity (1) is provided with an anti-corrosive coating on its surface to increase the flow rate of PFA material.

6. A mold as claimed in claim 5, wherein the corrosion resistant coating is a chrome coating.