TW202233387A - Supercritical fluid material injection molding machine and method thereof - Google Patents

Abstract

A supercritical fluid material squeezing molding machine and method thereof are provided. A molten foaming material, after being measured, is injected to be stored in a material storage cavity and subsequently injected into a mix cavity. Also, a supercritical fluid, after being measured, is injected into the mix cavity. The supercritical fluid and the molten foaming material are mixed in the mix cavity and injected into a mold to undergo a physical foaming. Without the need of additives such as foaming agent and crosslinker, the foaming material is easily decomposed to be recycled for reuse, achieving an environmental friendliness of the foaming process. Also, the foaming material and the supercritical fluid are separately measured without affecting each other, facilitating an accurate and continuous mixing process, and ensuring an average distribution of the supercritical fluid in the foaming material.

Description

Supercritical fluid injection molding machine and injection molding method thereof

The present invention relates to an injection molding machine, especially a supercritical fluid injection molding machine and an injection molding method thereof.

At present, there are many products made of foam molding on the market, such as the soles of sports shoes, slippers, floor mats and yoga mats. It has a more comfortable feeling when wearing or using, so it is loved by many consumers. However, conventional plastic/rubber foam materials used for foam molding all require additives such as foaming agents and bridging agents before chemical foaming can occur during the process for foam molding. However, the residual foamed materials in the subsequent process will be unfavorable for decomposition due to the aforementioned additives, so they cannot be recycled and reused, and can only be discarded to cause environmental pollution.

In order to solve the above-mentioned problems, a micro-foaming injection molding technology (Mucell) is known. The injection device is used to heat, melt and store the foamed raw materials in the cavity of a single tube body, and store the materials in the same cavity. After adding supercritical fluid and mixing, it is injected into the mold. Although the foaming process does not require additives such as foaming agent and bridging agent, the metering and mixing of foaming raw materials and supercritical fluid are completed in the same chamber. In practice, it is difficult to control the ratio of the foaming raw material and the supercritical fluid to be accurate, and it is difficult to ensure that the supercritical fluid can be evenly distributed in the foaming raw material, and how to solve this problem is the main focus of the present invention. where.

In order to solve the above-mentioned problems, the present invention provides a supercritical fluid injection molding machine and an injection molding method thereof, which are mainly to mix the foaming material with the supercritical fluid, and the foaming raw material and the supercritical fluid are separately measured, and after mixing, they pass through the physical material. Foam to complete foam molding.

An embodiment of the present invention provides a supercritical fluid injection molding machine, which includes a material pushing unit, an injection unit, and a supercritical fluid supply unit. The material pushing unit includes a first pipe body and a first material guide rod. The first pipe body has a material storage chamber running through its length direction. The first material guide rod is extended in the material storage chamber and can be driven. Rotate to guide the bubble-inducing raw materials to be melted and stored in the material storage chamber after metering; the injection unit includes a second pipe body and a second material guide rod, and the second pipe body has a mixer running through its length direction. chamber, the second material guide rod is extended in the mixing chamber and can be driven to rotate, the first pipe body is connected with a second pipe body at the front end to communicate with the material storage chamber and the mixing chamber, and the material storage chamber has been stored The molten foaming raw material is pushed by the first material guide rod and injected into the mixing chamber; the supercritical fluid supply unit is connected to the second pipe body and conducts the mixing chamber to measure and introduce the supercritical fluid into the mixing chamber, And it is mixed with the molten foaming material driven by the second guide rod to rotate, and is transported by the second guide rod and stored to the front end of the mixing chamber, and then pushed by the second guide rod and injected into a After the mold is closed, it is formed by physical foaming.

An embodiment of the present invention also provides an injection molding method for a supercritical fluid injection molding machine, which includes molten storage, first-stage injection, supercritical fluid introduction, mixing, second-stage injection, and physical injection. foam molding and other steps. In the step of melting and storing the material, the foamed raw material is introduced into the material storage chamber to be melted and metered in the material storage chamber with the guidance of the first material guide rod to store the material; in the first stage injection In the feeding step, when the foamed raw material in the molten state in the material storage chamber has been stored to a predetermined amount, it is pushed by the first material guide rod and injected into the mixing chamber; In the step, the supercritical fluid is metered and introduced into the mixing chamber by the supercritical fluid supply unit; in the mixing step, the supercritical fluid is driven to rotate by the second material guide rod and is in a molten state. The foaming raw materials are mixed, and are transported by the second material guide rod and stored to the front end of the mixing chamber; in the second-stage material injection step, the supercritical fluid measured in the mixing chamber is mixed with the molten material. The foaming raw material is driven and rotated by the second material guide rod to be mixed, and then pushed by the second material guide rod and injected into the mold when the mold is closed; finally, in the step of physical foam molding, the material in the mold is The supercritical fluid and the molten foamed raw material are heated and then cooled to form by physical foaming.

Thereby, according to the supercritical fluid injection molding machine and the injection molding method of the present invention, the foamed material can be injected into the mold after mixing with the supercritical fluid in the mixing chamber, and the mold is formed by physical foaming The predetermined finished product does not need additives such as foaming agent and bridging agent in the process, and the residual foamed material in the subsequent process is easy to decompose and is conducive to recycling, so as to achieve an environmentally friendly foaming process and raw materials. It can be recycled and effectively save costs, and the foaming material and the supercritical fluid are separately measured in the storage chamber and the mixing chamber without affecting each other, and can be repeatedly and continuously mixed in an accurate ratio, and at the same time ensure The supercritical fluid can be evenly distributed in the foaming material.

In order to facilitate the description of the central idea of the present invention expressed in the column of the above-mentioned summary of the invention, specific embodiments are hereby expressed. Various objects in the embodiments are drawn according to proportions, sizes, deformations or displacements suitable for description, rather than the proportions of actual elements, which will be described first.

Referring to FIGS. 1 to 12 , the present invention provides a supercritical fluid injection molding machine 100 and an injection molding method 200 thereof. The supercritical fluid injection molding machine 100 includes a material pushing unit 10, an injection unit 20, and a supercritical fluid supply unit 30; the injection molding method 200 includes the steps of a molten material 201, A first-stage injection 202 step, a supercritical fluid introduction 203 step, a mixing 204 step, a second-stage injection 205 step, and a physical foam molding 206 step for a mold M Finished product.

The preferred embodiment of the supercritical fluid injection molding machine 100 of the present invention will be described below, wherein:

The material pushing unit 10 includes a first pipe body 11 and a first material guide rod 12 . The first pipe body 11 has a material storage chamber 13 running through its length in the first pipe body 11 . The first material guide rod 12 The first material guide rod 12 can be driven to rotate, so as to guide the foam-inducing raw material to melt in the material storage chamber 13 and store the material in the material storage chamber 13 . The foaming raw material is melted through the material storage chamber 13 , because a heater 111 is provided along the outer circumference of the first pipe body 11 to heat the foaming raw material, and the heater 111 is, for example, an electric heating sheet.

In this embodiment, the first material guide rod 12 is a lead screw, which has an oblique cone portion 121 at the front end, and the inclined cone portion 121 is tapered toward the conveying direction of the foaming material; the first material guide The rod 12 is sleeved with a non-return ring 14 corresponding to the inclined cone portion 121 , and the non-return ring 14 has a channel 141 , through which the channel 141 allows the foaming raw material to flow through the non-return ring 14 , and the non-return ring 14 has a An oblique concave portion 142 , through which the non-return ring 14 can relatively stop against the oblique cone portion 121 .

The injection unit 20 includes a second pipe body 21 and a second material guide rod 22 . There is a mixing chamber 23 in the second pipe body 21 , and the mixing chamber 23 is along the length direction of the second pipe body 21 . The second material guide rod 22 is extended in the mixing chamber 23, and the second material guide rod 22 can be driven to rotate, and the first pipe body 11 is connected with a second pipe body 21 at the front end to communicate with the storage The material chamber 13 is in the mixing chamber 23 .

In this embodiment, the front end of the first tube body 11 is connected to the second tube body 21 by an adapter seat 15. The adapter seat 15 has a flow channel 151, the first tube body 11 and the connected second tube body A middle-section valve 16 is disposed on the adapter seat 15 between the bodies 21 , and the middle-section valve 16 has a valve stem 161 extending into the flow channel 151 . When the middle valve 16 is opened in this embodiment, the valve stem 161 is retracted and not blocked in the flow channel 151, so as to control the communication between the material storage chamber 13 and the mixing chamber 23; and when the middle valve 16 is closed, the valve stem 161 protrudes and blocks in the flow channel 151 to control the material storage chamber 13 and the mixing chamber 23 to be disconnected. The first tube body 11 and the second tube body 21 are connected by the adapter seat 15 , which is mainly for the convenience of assembly and is only a preferred embodiment, and the present invention is not limited thereto.

The first material guide rod 12 of this embodiment is connected to a driving cylinder 17, which is a hydraulic cylinder in this embodiment, and the driving cylinder 17 is combined with a hydraulic motor 18 in this embodiment. A guide rod 12 is driven by the hydraulic motor 18 to rotate, and the hydraulic motor 18 is erected on a pair of guide rails 181 . The actuation of the driving cylinder 17 can drive the first guide rod 12 to linearly move in the storage chamber 13 . After the foaming material is introduced and stored in the material storage chamber 13, the connected driving cylinder 17 drives the first material guide rod 12 to push the foaming material for injection. In this embodiment, a measuring element 19 is arranged between the first pipe body 11 and the hydraulic motor 18 . The measuring element 19 is a resistance ruler in this embodiment, and the measuring element 19 is displaced with the first material guide rod 12 . , so that the foaming raw material in the molten state is metered when the material is stored in the material storage chamber 13 .

The second material guide rod 22 is also connected to a driving cylinder 24 in this embodiment. The driving cylinder 24 is also a hydraulic cylinder in this embodiment, and the driving cylinder 24 is combined with a hydraulic motor 25 in this embodiment. The material guide rod 22 is rotated by the hydraulic motor 25, and the hydraulic motor 25 is erected on a pair of guide rails 251. The actuation of the driving cylinder 24 can drive the second material guide rod 22 to move linearly in the mixing chamber 23. After the foaming raw material is introduced and stored in the mixing chamber 23 , the connected driving cylinder 24 drives the second material guide rod 22 to push the foaming raw material in the mixing chamber 23 for injection. In this embodiment, the front end of the second pipe body 21 is provided with a material blocking valve 26, which controls the mixing chamber 23 to communicate with the mold M when the material blocking valve 26 is opened; Mold M is disconnected.

The supercritical fluid supply unit 30 is connected to the second pipe body 21 and conducts the mixing chamber 23 to introduce the supercritical fluid into the mixing chamber 23, and the second material guide rod 22 is driven to rotate and mix into the mixing chamber 23. Supercritical fluid and the foamed raw material in molten state. The supercritical fluid takes carbon dioxide (CO2) as an example in this embodiment, but is not limited to carbon dioxide (CO2), for example, water (H2O) or methane (CH4) can also be the supercritical fluid of the present invention . In addition, the second material guide rod 22 of the present embodiment has a mixing section 221 in the mixing chamber 23 , and the mixing section 221 is formed with a plurality of grooves in the outer periphery of the second material guide rod 22 that are approximately helical. A groove 221 a is formed (as shown in FIG. 2 ), and the mixing section 221 is used for mixing the foaming raw material and the supercritical fluid in the mixing chamber 23 .

In this embodiment, the supercritical fluid supply unit 30 includes a bottle body 31, which is a steel cylinder in this embodiment to store the supercritical fluid; the supercritical fluid supply unit 30 in this embodiment is also provided with a The pipeline 32 is connected with the bottle body 31 and the mixing chamber 23 by the arrangement of the pipeline 32 , and a pressurizing pump 33 is arranged in the middle of the pipeline 32 between the bottle body 31 and the mixing chamber 23 . Preferably, in this embodiment, a gas cylinder 34 is provided in the middle of the pipeline 32 between the pressurizing pump 33 and the mixing chamber 23, and the pipeline 32 is also connected with an air valve 35 and communicates with the mold M, and the air valve 35 is used for the mold. M Relief and exhaust. In this embodiment, a gas metering valve 36 is provided in the middle of the pipeline 32 between the pressurizing pump 33 and the mixing chamber 23, and the gas metering valve 36 is opened to measure the output of the supercritical fluid. Close when done.

The above is a description of the preferred embodiment of the supercritical fluid injection molding machine 100 of the present invention, and the preferred embodiment of the injection molding method 200 of the present invention is further described below, as shown in FIG. Steps such as first-stage injection 202, supercritical fluid introduction 203, mixing 204, second-stage injection 205, and physical foam molding 206 are performed, wherein:

In the step of melting and storing material 201 , the foamed raw material is introduced into the material storage chamber 13 , so as to be in a molten state in the material storage chamber 13 with the guidance of the first material guide rod 12 for material storage. In this embodiment, the first pipe body 11 is provided with a hopper 112 , and the foaming raw material A is poured manually (in this case, it is in the form of granules), and the first material guide rod 12 is driven by the hydraulic motor 18 to rotate. , the foaming raw material A is transported in the storage chamber 13 (as shown in FIG. 4 ), and is heated by the heater 111 and stirred through the rotation of the first material guide rod 12 during the transport process, so that the The foaming raw material A can be uniformly melted in the material storage chamber 13 .

On the other hand, in the process of storing the material in the material storage chamber 13, the foaming raw material A is in a molten state, and the middle valve 16 is closed to control the non-communication between the material storage chamber 13 and the mixing chamber 23, so as to avoid the foaming of the raw material. Accidentally flows into the mixing chamber 23, at this time the first material guide rod 12 is driven by the hydraulic motor 18 to rotate and gradually retreats (as shown in FIG. 5). The measurement of the foaming raw material A stored in the storage chamber 13 is carried out, and when the measuring element 19 detects that the foaming raw material A stored in the storage chamber 13 has reached a predetermined amount, the hydraulic motor 18 stops immediately. Next, the step of the first-stage injection 202 is performed.

In the first stage of material injection 202, since the molten foam material A in the material storage chamber 13 has been stored to the predetermined amount, it must be pushed by the first material guide rod 12 and injected into the mixing chamber. twenty three. At this time, the middle valve 16 is changed from the original closed state to open to control the communication between the material storage chamber 13 and the mixing chamber 23 , and the driving cylinder 17 drives the first material guide rod 12 to linearly displace in the material storage chamber 13 Then, the foaming raw material A is pushed, so that the foaming raw material A is injected into the mixing chamber 23 (as shown in FIG. 6 ) through the flow channel 151 of the adapter seat 15 , and is subjected to oil pressure through the second material guide rod 22 The motor 25 is driven to rotate and gradually retreat, so as to store the foaming raw material A at the front end of the mixing chamber 23. After the foaming raw material A in the mixing chamber 23 reaches a predetermined amount, the middle valve 16 is changed to be closed to make the mixing chamber 23. The chamber 23 is not in communication with the storage chamber 13 (as shown in FIG. 7 ).

In the step of introducing the supercritical fluid 203 , the supercritical fluid is mainly introduced into the mixing chamber 23 by the supercritical fluid supply unit 30 . In the present embodiment, the supercritical fluid is measured by opening the gas metering valve 36, and the pressure is driven by the pressurizing pump 33, so that the supercritical fluid released by the bottle body 31 is introduced into the mixture through the pipeline 32. In the chamber 23 (as shown in FIG. 8 ), the gas metering valve 36 is closed after the metering is completed, and when the pressurizing pump 33 is driven to pressurize, the pressure can be accumulated in the gas storage cylinder 34 to ensure that the supercritical fluid is maintained at It is delivered to the mixing chamber 23 under high pressure.

It must be noted that, in the above embodiment, after the first-stage injection 202 is completed, the step of introducing the supercritical fluid 203 is followed; however, in different embodiments, the first-stage injection 202 and The step of introducing the supercritical fluid into 203 can be performed simultaneously, that is, when the foaming raw material A is injected into the mixing chamber 23, the bottle 31 can simultaneously release the supercritical fluid through the pipeline 32 and introduce it into the mixing chamber 23 (as shown in FIG. 9 ). , the same result can be achieved by successively executing the step of the first-stage material injection 202 and the step of introducing the supercritical fluid 203 . When the first-stage injection 202 and the supercritical fluid introduction 203 are performed synchronously, since the storage chamber 13 and the mixing chamber 23 are in communication, the supercritical fluid is in a high-pressure state, which can cause a reverse push to the check ring 14 The slanted concave portion 142 of the non-return ring 14 stops at the slanted cone portion 121 , so as to produce an anti-return effect and maintain the foaming material A in the mixing chamber 23 in a high pressure state.

The step of mixing 204 starts after the step of injecting material 202 in the first stage and the step of introducing supercritical fluid 203 are executed sequentially or simultaneously. In this step, the hydraulic motor 25 drives the second material guide rod 22 to rotate in the mixing chamber 23. At this time, the mixing section 221 controls the foaming material A in the mixing chamber 23 and the supercritical The fluid is stirred, so that the foaming raw material A and the supercritical fluid are fully mixed in the mixing chamber 23, and the second material guide rod 22 is driven by the hydraulic motor 25 to rotate and gradually retreat, so as to fully The foaming raw material A mixed with the supercritical fluid is stored in the front end of the mixing chamber 23 , and then the second-stage injection 205 is performed. Assuming that the foaming raw material A is stirred by the first material guide rod 12 in the material storage chamber 13, the degree of its molten state cannot reach a uniform state, then in the step of mixing 204, the mixing section 221 is used to mix When the foaming raw material A and the supercritical fluid are stirred in the chamber 23, the foaming raw material A is stirred again, so when the step of mixing 204 is completed, the foaming raw material A has been passed through the first material guide rod successively. 12 and the mixing section 221 are repeatedly and continuously stirred, so that the foamed raw material A is uniformly melted in the mixing chamber 23, and the supercritical fluid is uniformly distributed in the foamed raw material.

In the second-stage injection 205 step, when the supercritical fluid and the molten foaming raw material A have been fully mixed in the mixing chamber 23 through the mixing section 221, and the mold M is in the closed state, The mold M performs the action of gas pre-pressing, that is, the high-pressure gas stored in the gas cylinder 34 is introduced into the mold M when the mold is closed through the air valve 35 (open state) through the pipeline 32 (as shown in FIG. 10 ), Then open the material blocking valve 26, the second material guide rod 22 can be driven by the driving cylinder 24 to move linearly in the mixing chamber 23. At this time, the foaming raw material A stored in the front end of the mixing chamber 23 is guided by the second material. The rod 22 is pushed (as shown in FIG. 11 ), so that the foaming raw material A is injected into the mold M, and then the material blocking valve 26 is closed. In this embodiment, when the mold M is already in the mold-closed state, and before the foaming raw material A is injected into the mold M, the step of physical foam molding 206 is then performed.

In the step of physical foam molding 206, the foaming raw material A mixed with supercritical fluid injected into the mold M is heated and cooled in the mold M, and when the predetermined time is reached, the air valve 35 is opened first to leak After pressing and exhausting, the mold M can be opened, and the finished product B can be formed by physical foaming (as shown in FIG. 12 ).

It is not difficult to find the characteristics of the present invention from the above-mentioned description, which is:

1. Using the supercritical fluid injection molding machine 100 of the present invention and the injection molding method 200 thereof, the foamed material A is injected into the mold M after being mixed with the supercritical fluid in the mixing chamber 23, and is then injected into the mold M with a physical foaming material. The predetermined finished product B of the mold M is formed in the same way, and there is no need for additives such as foaming agents and bridging agents in the process. The residual foamed materials in the subsequent process are easy to decompose and are conducive to recycling. The foaming process is environmentally friendly to avoid environmental pollution, and the raw materials can be recycled to effectively save costs.

2. It can be seen from the description of the above embodiment that the foaming raw material A is stored in the material storage chamber 13 to the predetermined amount before being injected into the mixing chamber 23, and is measured according to the above embodiment. Part 19 completes the metering; the raw material A to be foamed is injected into the mixing chamber 23, the supercritical fluid is introduced into the mixing chamber 23 and metered through the gas metering valve 36 as in the above embodiment to mix with the foaming raw material A. Therefore, the measurement of the foaming raw material A in the storage chamber 13 and the measurement when the supercritical fluid is introduced into the mixing chamber 23 and mixed with the foaming raw material A, these two measurement procedures are independent and operate separately, and are independent of each other. Affect the accuracy of each other's metering, thereby ensuring that the foaming raw material A and the supercritical fluid can be repeatedly and continuously mixed in the mixing chamber 23 in an accurate ratio, and at the same time ensure that the supercritical fluid can be distributed in the foaming raw material. evenly.

The above-mentioned embodiments are only used to illustrate the present invention, but not to limit the scope of the present invention. All the modifications or changes that do not violate the spirit of the present invention belong to the intended protection category of the present invention.

100: Injection molding machine 200: Injection molding method 201: molten storage material 202: The first stage shot 203: Supercritical fluid introduction 204: Mixed 205: The second stage shot 206: Physical foam molding 10: Material push unit 11: The first tube body 111: heater 112: Hopper 12: The first guide rod 121: Oblique taper 13: storage chamber 14: check ring 141: channel 142: Oblique recess 15: transfer seat 151: runner 16: Middle valve 161: Stem 17: Drive cylinder 18: Hydraulic motor 181: Rails 19: Measuring pieces 20: Shooting unit 21: The second tube body 22: The second guide rod 221: Mixing section 221a: Groove 23: Mixing Chamber 24: drive cylinder 25: Hydraulic motor 251: Rails 26: Material blocking valve 30: Supercritical fluid supply unit 31: bottle body 32: pipeline 33: Pressurized pump 34: gas cylinder 35: Air valve 36: Gas metering valve A: Foaming raw material B: Finished product M: mold

FIG. 1 is a schematic diagram of a supercritical fluid injection molding machine according to an embodiment of the present invention. 2 is a perspective view of a partial structure of the second material guide rod in the mixing section according to the embodiment of the present invention. FIG. 3 is a flowchart of an injection molding method according to an embodiment of the present invention. FIG. 4 is a schematic diagram of the foaming material being fed into the material storage chamber and conveyed through the first material guide rod according to the embodiment of the present invention. Fig. 5 is a schematic diagram of the first material guide rod in the continuation of Fig. 4, when the middle valve is closed and the material is stored backward, and the material is measured by the metering element. FIG. 6 is a schematic diagram of the first material guide rod moving forward to push the molten foamed raw material into the mixing chamber when the middle valve is opened, following FIG. 5 . FIG. 7 is a schematic diagram of the second material guide rod in the continuation of FIG. 6 retreating and storing material when the valve in the middle section is closed. FIG. 8 is a schematic diagram of opening the gas metering valve to introduce the supercritical fluid into the mixing chamber after the material storage is completed in the continuation of FIG. 7 . 9 is a schematic diagram of another implementation state in which the first material guide rod moves forward to push the molten foamed raw material into the mixing chamber and the supercritical fluid is simultaneously introduced into the mixing chamber according to the embodiment of the present invention. FIG. 10 is a schematic diagram of closing the mold and opening the gas valve to perform gas pre-pressing on the mold following FIG. 8 . FIG. 11 is a schematic diagram of injecting the foamed raw material mixed with supercritical fluid into the mold by using the second material guide rod when the material blocking valve is opened, following FIG. 10 . FIG. 12 is a schematic view of the finished product after the foaming material is heated and cooled in the mold following FIG. 11 .

100: Injection molding machine

10: Pressing unit

11: The first tube body

111: Heater

112: Hopper

12: The first guide rod

121: Oblique taper

13: Storage chamber

14: check ring

141: Channel

142: Oblique recess

15: Adapter

151: runner

16: Middle valve

161: Stem

17: Drive cylinder

18: Hydraulic motor

181: Rails

19: Measuring pieces

20: Injection unit

21: The second tube body

22: The second guide rod

221: Mixing section

23: Mixing Chamber

24: Drive cylinder

25: Hydraulic motor

251: Rails

26: Material blocking valve

30: Supercritical fluid supply unit

31: bottle body

32: Pipeline

33: Pressurized pump

34: Gas cylinder

35: Air valve

36: Gas metering valve

M: mold

Claims (16)

A supercritical fluid injection molding machine, comprising: A material pushing unit, which includes a first pipe body and a first material guide rod, the first pipe body has a material storage chamber running through its length direction, and the first material guide rod extends from the material storage chamber It is in the chamber and can be driven to rotate, so as to induce the foaming raw material to be melted and stored in the storage chamber after metering; An injection unit, which includes a second pipe body and a second material guide rod, the second pipe body has a mixing chamber running through its length direction, the second material guide rod is extended in the mixing chamber and can be Driven to rotate, the first pipe body is connected to the second pipe body at the front end to communicate with the material storage chamber and the mixing chamber, and the material storage chamber has stored the molten foaming raw material from the The first material guide rod is pushed and injected into the mixing chamber, and is transported by the second material guide rod and stored in the front end of the mixing chamber; and a supercritical fluid supply unit, which is connected to the second pipe body and conducts the mixing chamber to measure and introduce supercritical fluid into the mixing chamber, and connect with the molten foaming raw material through the second conducting The material rod is driven to rotate and mix, and then pushed by the second material guide rod and injected into a mold when the mold is closed, and then formed by physical foaming. The supercritical fluid injection molding machine according to claim 1, wherein the second material guide rod has a mixing section in the mixing chamber for mixing the foaming raw material and the supercritical fluid. The supercritical fluid injection molding machine as claimed in claim 2, wherein the mixing section is formed by a plurality of grooves that are approximately helical on the outer periphery of the second material guide rod. The supercritical fluid injection molding machine as claimed in claim 2, wherein the first material guide rod has an oblique tapered portion at the front end that tapers toward the conveying direction of the foamed raw material, and the first material guide rod corresponds to the A non-return ring is sleeved on the inclined cone portion, the non-return ring has a channel for the foaming raw material to circulate, and has an inclined concave portion which can be relatively stopped on the inclined cone portion. The supercritical fluid injection molding machine as claimed in claim 1, wherein a middle valve is provided between the first pipe body and the connected second pipe body, and the middle valve is opened to control the storage chamber and the material storage chamber. The mixing chamber is connected, or the middle valve is closed to control the material storage chamber and the mixing chamber to be disconnected; the front end of the second pipe body is provided with a material blocking valve, and the material blocking valve is opened to control the mixing chamber The chamber is in communication with the mold, or the blocking valve is closed to control the mixing chamber to be out of communication with the mold. The supercritical fluid injection molding machine according to claim 1, wherein the supercritical fluid supply unit comprises a bottle body for storing the supercritical fluid, and a pipeline is arranged to communicate with the bottle body and the mixing chamber, A gas metering valve and a pressurizing pump are arranged in the middle of the pipeline between the bottle body and the mixing chamber. The gas metering valve is opened and the pressurizing pump drives and pressurizes, so that the bottle body releases the described The supercritical fluid is introduced into the mixing chamber through the line. The supercritical fluid injection molding machine as claimed in claim 6, wherein a gas storage bottle is provided in the middle of the pipeline between the pressurizing pump and the mixing chamber, and the pressurizing pump drives the pressurization to pressurize the storage tank. Pressure builds up in the cylinder. The supercritical fluid injection molding machine as claimed in claim 7, wherein the pipeline is connected with an air valve and communicates with the mold, so as to preload a cavity formed in the mold when the mold is closed, Then, before the mold is opened, the air valve is used to depressurize and exhaust. The supercritical fluid injection molding machine as claimed in claim 1, wherein the first material guide rod and the second material guide rod are respectively connected to a driving cylinder, and the driving cylinder drives the first material guide rod to push the cylinder. The foam material is injected into the storage chamber. The supercritical fluid injection molding machine according to claim 9, wherein the first guide rod and the second guide rod are respectively connected to a hydraulic motor to be driven to rotate, and each of the driving cylinders is a hydraulic cylinder. A kind of injection molding method of supercritical fluid injection molding machine as claimed in claim 1, which comprises the following steps: Melting material storage: introduce the foamed raw material into the material storage chamber, so as to be guided by the first material guide rod to be melted in the material storage chamber and measure for material storage; The first-stage material injection: when the foamed raw material in the molten state in the material storage chamber has been stored to a predetermined amount, it is pushed by the first material guide rod and injected into the mixing chamber, and passed through the mixing chamber. The second material guide rod is transferred and stored to the front end of the mixing chamber; Supercritical fluid introduction: the supercritical fluid supply unit measures and introduces the supercritical fluid into the mixing chamber; Mixing: the supercritical fluid is driven to rotate by the second material guide rod to be mixed with the molten foaming raw material; and The second-stage material injection: after the supercritical fluid and the molten foamed raw material measured in the mixing chamber are mixed by the second material guide rod, the second material guide rod is driven to rotate. The rod is pushed and injected into the mold when the mold is closed; Physical foaming molding: The supercritical fluid and the molten foaming material in the mold are heated and then cooled to form by physical foaming. The injection molding method as claimed in claim 11, wherein a middle valve is provided between the first pipe body and the connected second pipe body, and during the step of melting and storing materials, the middle valve is closed to control the storage The material chamber is not communicated with the mixing chamber; in the first stage of material injection, the middle valve is opened to control the communication between the material storage chamber and the mixing chamber, so that the material in the material storage chamber is melted The foaming material in the shape of the foam can be injected into the mixing chamber. The injection molding method according to claim 11, wherein, in the first-stage material injection step, after the foaming material is pushed by the first material guide rod and injected into the mixing chamber, In the step of introducing the supercritical fluid, the supercritical fluid is introduced into the mixing chamber by the supercritical fluid supply unit, and then the mixing step is carried out, and the second material guide rod is driven to rotate and melts The foaming raw materials in the form are mixed. The injection molding method according to claim 11, wherein, in the first-stage material injection step, the supercritical fluid introduction step is simultaneously performed, that is, the foaming material is pushed and injected by the first material guide rod When entering into the mixing chamber, the supercritical fluid supply unit simultaneously introduces the supercritical fluid into the mixing chamber, and then performs the mixing step, and the second material guide rod is driven to rotate to be molten. The foaming raw materials in the form are mixed. The injection molding method according to claim 11, wherein the supercritical fluid supply unit comprises a bottle body for storing the supercritical fluid, and a pipeline is arranged to communicate the bottle body and the mixing chamber, and the bottle body is A gas metering valve and a pressurizing pump are arranged in the middle of the pipeline with the mixing chamber. The gas metering valve is opened and the pressurizing pump drives and pressurizes, so that the supercritical fluid released by the bottle body passes through. The pipeline is introduced into the mixing chamber, and a gas cylinder is arranged in the middle of the pipeline between the pressurizing pump and the mixing chamber, and the pressurizing pump drives the pressurization to accumulate pressure in the gas cylinder , further set an air valve in the mold, the pipeline connecting the bottle body and the mixing chamber is connected to the air valve and communicated with the mold, so as to form a cavity in the mold when the mold is closed The air is pre-pressed, and then the air valve is used to decompress and exhaust the mold before the mold is opened. The injection molding method according to claim 11, wherein the supercritical fluid is carbon dioxide, water or methane.

Images