CN218776985U

CN218776985U - Exhaust structure of mold

Info

Publication number: CN218776985U
Application number: CN202223000876.5U
Authority: CN
Inventors: 张雅雯
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-11-10
Filing date: 2022-11-10
Publication date: 2023-03-31
Anticipated expiration: 2032-11-10

Abstract

The utility model provides an exhaust structure of a mold, which comprises a mold, a first exhaust pipe and a second exhaust pipe, wherein the mold is provided with a mold body and a mold chamber space which is defined by the mold body and exists in the mold body; a hole-shaped pouring gate which is arranged on the die body, is communicated with the die chamber space and the external space outside the die body and is used for being connected with a flow passage of an external high polymer raw material supply device in series; a blind hole shaped first air passage which is arranged on the die body at a distance from the pouring channel and enables one end of the first air passage to be separated from the orifice of the die chamber and the sprue of one end of the pouring channel which is communicated with the die chamber by a preset distance; and the second air passage is communicated with the first air passage and arranged on the mould body, and extends to one side of the mould body to be communicated with the external space of the mould body. The utility model discloses it can be ensured in the mould adjacent to the regional die chamber space of raw materials entering, the gas as the back pressure can be got rid of smoothly, avoids influencing subsequent shaping quality.

Description

Exhaust structure of mold

Technical Field

The present invention relates to polymer molding technology, and more particularly to an exhaust structure for a mold.

Background

In the technical field of back pressure molding, the polymer material is confined in the mold chamber by the pressure formed by filling the gas into the mold chamber space in advance, and will not foam after entering the mold chamber, and after the rated amount of polymer material enters the mold chamber, the gas filled in the mold chamber in advance begins to be discharged, so that the polymer material in the mold chamber foams, and the desired foamed molded article is molded by the mold chamber.

These conventional techniques are well known in the polymer molding process, but the venting technique for pre-filling the mold chamber with gas is not good, so that part of the gas remains in the mold chamber after the venting process, which affects the subsequent foaming process.

SUMMERY OF THE UTILITY MODEL

Therefore, the main objective of the present invention is to provide an exhaust structure for a mold, which can ensure that the gas as the back pressure can be smoothly exhausted in the mold space adjacent to the raw material entering region, thereby avoiding affecting the subsequent molding quality.

To achieve the above object, the present invention provides an exhaust structure for a mold, comprising a mold having a mold body and a mold cavity defined by the mold body and located inside the mold body; a hole-shaped pouring channel which is arranged on the die body, is communicated with the die chamber space and the external space outside the die body and is used for being connected with a flow channel of an external high polymer raw material supply device in series, so that the high polymer raw material is injected into the die chamber space from the high polymer raw material supply device through the pouring channel; a blind hole-shaped first air passage which is arranged on the die body and separated from the pouring channel, and a preset distance is reserved between an orifice at one end of the first air passage and communicated with the die chamber and a sprue at one end of the pouring channel and communicated with the die chamber; and the second air passage is communicated with the first air passage and arranged on the mould body, and extends to one side of the mould body to be communicated with the external space of the mould body.

Preferably, the second air passage communicates with the first air passage in a radial direction of the first air passage.

Preferably, the number of the first air passages is plural and the first air passages are arranged at equal intervals along an imaginary circle centering on the runner.

Preferably, the first air channel is annular and surrounds the periphery of the pouring channel.

Preferably, the mold further comprises a hollow cylindrical nozzle, and the gate is defined by a hollow space of the nozzle.

Preferably, the mold further comprises a receiving hole disposed on the mold body and communicating the mold cavity space with the exterior of the mold body, and receiving the nozzle.

Preferably, the first air passage is located between the circumferential side of one end of the nozzle and the opposite hole wall of the receiving hole portion, and is defined by a gap formed by a difference between an outer diameter of one end of the nozzle and an aperture of the receiving hole portion.

Preferably, the inner diameter of the first air passage is between 0.05mm and 0.20 mm.

Preferably, the second air passage communicates with the first air passage in an axial direction of the first air passage.

The utility model has the advantages that:

the utility model provides an exhaust structure of mould, it can be ensured in the mould adjacent to the regional die chamber space of raw materials entering, can get rid of smoothly as the gas of back pressure, avoids influencing subsequent shaping quality.

Drawings

Fig. 1 is a perspective view of a first preferred embodiment of the present invention.

Fig. 2 is a top enlarged partial view of the first preferred embodiment of the present invention.

Fig. 3 is a sectional view of the first preferred embodiment of the present invention taken along line 3-3 of fig. 1.

Fig. 4 is a sectional view of the first preferred embodiment of the present invention taken along line 4-4 of fig. 1.

Fig. 5 is a sectional view of a second preferred embodiment of the present invention.

Fig. 6 is an enlarged partial sectional view of a second preferred embodiment of the present invention.

Detailed Description

Referring to fig. 1 to 4, a mold venting structure 10 according to a first preferred embodiment of the present invention mainly includes a mold 20, a plurality of runners 30, a plurality of first air channels 40, and a plurality of second air channels 50.

The mold 20 has a mold body 21 and two mold cavity 22 spaces defined by the mold body 21 and located inside the mold body 21, wherein the mold body 21 is a conventional multi-layer mold technology, and further includes a middle mold sheet 211, a first side mold sheet 212 and a second side mold sheet 213 respectively stacked on two side sheets of the middle mold sheet 211, and the mold cavities 22 are located between the first side mold sheet 212 and the second side mold sheet 213, and the middle mold sheet 211, the first side mold sheet 212 and/or the second mold sheet 213 collectively define the space shape of each mold cavity 22.

The runners 30 are respectively arranged on the first side die plate 212 in a straight hole shape to respectively communicate with the die chambers 22 and the external space outside the die body 21, so as to form a flow channel for macromolecule raw material to enter the die chambers 22 from the outside of the die 20.

The first air passages 40 are blind holes and are disposed on the first side mold piece 212 in an imaginary circular ring centered around the gate 30, respectively, and spaced apart from each other, so that the openings of the first air passages 40 for communicating with the spaces of the mold chambers 22 and the gate openings at the center of the imaginary circular ring are spaced apart from each other by a suitable distance, the size of which is determined by the volume of the mold chambers, the volume of the injected material, the flow rate of the injected material, etc., to ensure that the areas adjacent to the gate positions of the gates 30 in the spaces of the mold chambers 22 can communicate with all or a part of the first air passages 40 after the material is injected. In addition to the above-mentioned means, the first air ducts can be arranged along the positions of the multiple concentric or non-concentric imaginary rings centered on the corresponding runners, and these changes are only another possible implementation aspect of the present invention.

The second gas passages 50 are respectively communicated with the first gas passages 40, and provide gas flow passages connecting the first gas passages 40 and the space outside the mold 20, except that as disclosed in the present embodiment, the second gas passages 50 are respectively communicated with the first gas passages 40 in the radial direction of the first gas passages 40, and further the second gas passages 50 are formed in the range of the mold body 21 to form suitable paths, and finally a single outlet is formed on the outer side surface of the mold body 21, so as to facilitate the control action of charging or discharging the gas flow passage formed by the first gas passages 40 and the second gas passages 50, in other possible embodiments, the second gas passages can be communicated with the first gas passages in the axial direction of the first gas passages.

Therefore, when the external polymer material supplying device, such as the injection machine, the extruder, etc., is used to make the injecting end abut against the mold 20 and connect the flow channel for flowing the material with the openings of the runners 30 on the first side mold piece 212 in series, the polymer material enters the space of each mold chamber 22 from the flow channel through the runners 30, and in the technical scope of the back pressure forming, the gas in the space of the mold chambers 22 is injected in advance, i.e., the back pressure is generated to the foaming of the polymer material entering the mold chambers, thereby preventing the foaming reaction from proceeding, and after the rated amount of material is completely injected into the mold chambers, the gas in the mold chambers 22 is discharged to the outside of the mold 20 by the conventional gas flow control technology such as the valve, which belongs to the conventional technology.

It should be noted that the first air ducts 40 are located at the adjacent position of the runners 30, which is not disclosed in the prior art, and the gas in the mold chamber located near the gate can be simultaneously exhausted through the first air ducts 40 during the gas exhausting process, so as to avoid the gas existing near the gate being obstructed by the instantaneously increased volume of the raw material during foaming and being unable to be exhausted out of the mold through other conventional exhaust passages existing in the mold to affect the molding.

Referring to fig. 5 and 6, the exhaust structure 10a of the mold according to the second preferred embodiment of the present invention has the same technical features as those of the first preferred embodiment, but the following differences are still included:

the number of the first air passages 40a is the same as that of the runners 30a, and each of the first air passages is an annular blind hole extending along the runners 30a as a center, and the air is controlled to enter and exit by an external control mechanism through the second air passages 50 a.

In order to form the first air passages 40a, the mold 20a further includes a plurality of receiving holes 23a respectively passing through the first side mold piece 212a and communicating with the mold chamber 22a, a plurality of hollow cylindrical nozzles 24a respectively coaxially inserted into the receiving holes 23a, and the runners 30a are formed in the hollow interiors of the nozzles 24a, and the annular gaps formed between the ends of the nozzles 24a adjacent to the mold chamber 22a and the hole walls of the receiving holes 23a opposite thereto by the diameter difference between the outer diameter of the nozzle 24a and the hole diameter of the receiving hole 23a define the annular first air passages 40a.

Further, in the embodiments described above, the inner diameter of the first air channel or the gap is much smaller than the inner diameter of the runner, and it is preferable that the inner diameter is between 0.05mm and 0.20mm in specific values.

The above description is the preferred embodiment of the present invention and the technical principle applied by the same, and for those skilled in the art, without departing from the spirit and scope of the present invention, any obvious changes such as equivalent transformation, simple replacement, etc. based on the technical solution of the present invention all belong to the protection scope of the present invention.

Claims

1. An exhaust structure for a mold, comprising:

a mould, which is provided with a mould body and a mould chamber space defined by the mould body and existing in the mould body;

a hole-shaped pouring gate which is arranged on the die body, is communicated with the die chamber space and the external space outside the die body and is used for being connected in series with a flow passage of an external high polymer raw material supply device, so that the high polymer raw material is injected into the die chamber space from the high polymer raw material supply device through the pouring gate;

a blind hole-shaped first air passage which is arranged on the die body and separated from the pouring channel, and a preset distance is reserved between an orifice at one end of the first air passage and communicated with the die chamber and a sprue at one end of the pouring channel and communicated with the die chamber;

and the second air passage is communicated with the first air passage and arranged on the mould body, and extends to one side of the mould body to be communicated with the external space of the mould body.

2. The venting structure of a mold according to claim 1, wherein the second air passage communicates with the first air passage in a radial direction of the first air passage.

3. The venting structure of a mold according to claim 1, wherein the number of the first air passages is plural and the first air passages are arranged at equal intervals along an imaginary circle centered on the gate.

4. The venting structure of a mold according to claim 1, wherein the first air channel is annular and surrounds a peripheral side of the gate.

5. The venting structure of a mold according to claim 3 or 4, wherein the mold further comprises a hollow cylindrical nozzle, and the gate is defined by a hollow space of the nozzle.

6. The venting structure of a mold according to claim 5, wherein the mold further comprises a receiving hole formed in the mold body and communicating the cavity space with an outside of the mold body, and receiving the nozzle.

7. The venting structure of a mold according to claim 6, wherein the first air passage is defined by a gap formed by a difference between an outer diameter of one end of the nozzle and an aperture diameter of the receiving hole portion between a peripheral side of the one end of the nozzle and an opposing aperture wall of the receiving hole portion.

8. The venting feature of a mold according to claim 1, 2, 3 or 4, wherein the inner diameter of the first air channel is between 0.05mm and 0.20 mm.

9. The venting structure of a mold according to claim 1, wherein the second air passage communicates with the first air passage in an axial direction of the first air passage.