Injection molding method and injection molding machine injection device

Abstract

This invention discloses an injection molding method and an injection molding machine injection device. [Solution] The injection molding method includes the steps of: closing the injection mold and connecting the nozzle of the injection molding machine injection device to the injection port of the injection mold; moving the valve needle of the injection molding machine injection device from a closed position that closes the injection port of the nozzle to an open position that opens the injection port of the nozzle, thereby injecting molten injection material into the cavity of the injection mold; after filling the cavity of the injection mold with molten injection material, moving the valve needle from the open position to a closed position so that the tip of the valve needle is inserted into the injection port and slightly embedded in the injection molded product; after the injection molded product has cooled and solidified, moving the valve needle from the closed position back to a separated position away from the injection molded product; and opening the injection mold and removing the injection molded product from the injection mold.

Description

Technical Field

[0001] Cross - reference to Related Applications This application claims the benefit of Chinese Patent Application No. CN202411934954.X, filed with the China National Intellectual Property Administration on December 26, 2024, the entire disclosure of which is incorporated herein by reference.

[0002] The present invention relates to an injection molding method for injection - molded products and an injection molding machine spraying device for injecting a molten injection molding material into an injection mold.

Background Art

[0003] In the prior art, when injecting a product, first, after connecting the injection molding machine nozzle to the injection port of the injection mold, the injection molding machine nozzle is opened, and the molten injection material is injected into the cavity of the injection mold. After the injection material in the injection mold is cooled and solidified, the injection mold can be opened, and the injection - molded product can be taken out. However, in the prior art, since the injection port of the injection mold is also filled with the injection material during the injection molding process, a protrusion corresponding to the injection port can be formed on the injection - molded product. Therefore, in the prior art, it is necessary to cut the protrusion before demolding, which not only reduces the injection efficiency but also may cause defects in the injection - molded product when cutting the protrusion, thus reducing the quality of the injection - molded product.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present invention is made to overcome or alleviate at least one aspect of the above - mentioned drawbacks.

Means for Solving the Problems

[0005] According to one aspect of the present invention, an injection molding method is provided. The injection molding method includes S11: Closing the injection mold and connecting the nozzle of an injection molding machine spraying device to the injection port of the injection mold; S12: The step of moving the valve needle of the injection molding machine's spraying device from the closed position, which closes the spraying hole of the nozzle, to the open position, which opens the spraying hole of the nozzle, and injecting the molten injection material into the cavity of the injection mold, S13: After filling the injection mold cavity with molten injection material, the valve needle is moved from the open position to the closed position so that the tip of the valve needle is inserted into the injection port and slightly embedded in the injection molded product. S14: After the injection-molded product has cooled and solidified, the valve needle is moved from the closed position to a disengaged position (detached position, released position) away from the injection-molded product. S15: The step of opening the injection mold and removing the injection molded product from the injection mold. Includes.

[0006] According to an exemplary embodiment of the present invention, in step S14, the distance the valve needle travels from the closed position back to the separated position is slightly greater than the depth to which the tip of the valve needle is embedded in the injection-molded product.

[0007] According to another exemplary embodiment of the present invention, the distance traveled by the valve needle from the closed position back to the released position is in the range of 0.1 mm to 1.0 mm.

[0008] According to another exemplary embodiment of the present invention, in step S13, the depth to which the tip of the valve needle is embedded in the injection-molded product is in the range of 0.05 mm to 0.2 mm.

[0009] According to another exemplary embodiment of the present invention, in step S14, when the valve needle is moved to the separated position, the nozzle's injection hole remains closed, closed by the valve needle.

[0010] According to another aspect of the present invention, an injection molding machine injection device is provided. The injection molding machine injection device comprises a nozzle having an end suitable for docking with an injection mold inlet and an injection hole formed at the end; a valve needle movably provided on the nozzle for opening and closing the injection hole; and a drive device adapted to drive the valve needle to move between an open position that opens the injection hole and a closed position that closes the injection hole. After the cavity of the injection mold is filled with molten injection material, the drive device drives the valve needle from the open position to the closed position so that the tip of the valve needle is inserted into the inlet and slightly embedded in the injection molded product, and after the injection molded product has cooled and solidified, the drive device drives the valve needle to move from the closed position back to a separated position away from the injection molded product.

[0011] According to an exemplary embodiment of the present invention, the distance the valve needle travels from the closed position back to the released position is slightly greater than the depth to which the tip of the valve needle is embedded in the injection-molded product.

[0012] According to another exemplary embodiment of the present invention, the distance traveled by the valve needle from the closed position back to the released position is in the range of 0.1 mm to 1.0 mm.

[0013] According to another exemplary embodiment of the present invention, the depth to which the tip of the valve needle is embedded in the injection-molded product is in the range of 0.05 mm to 0.2 mm.

[0014] According to another exemplary embodiment of the present invention, when the valve needle moves to the separated position, the nozzle's injection hole remains closed, closed by the valve needle.

[0015] According to another exemplary embodiment of the present invention, the drive device comprises a linear electric cylinder and a controller for controlling the linear electric cylinder, wherein the actuation part of the linear electric cylinder is connected to a valve needle, so that the valve needle can move linearly together with the actuation part.

[0016] According to another exemplary embodiment of the present invention, the drive device comprises a servo motor, a transmission mechanism connected between the servo motor and a valve needle, and a controller for controlling the servo motor, the transmission mechanism being used to convert the rotational motion of the servo motor into linear motion of the valve needle.

[0017] According to another exemplary embodiment of the present invention, the drive device comprises a cylinder. The cylinder comprises a cylinder body having a first internal chamber formed therein, and a first piston component movably mounted in the first internal chamber and movable between a first position and a second position. When the first piston component is moved from the first position to the second position, the valve needle is moved by the first piston component from an open position to a closed position.

[0018] According to another exemplary embodiment of the present invention, the cylinder body also has a second internal chamber formed therein, separate from the first internal chamber. The cylinder further comprises a second piston component movably positioned in the second internal chamber. The second piston component is used to push the first piston component from a second position to a third position. When the first piston component is pushed from the second position to the third position by the second piston component, the valve needle is moved by the first piston component from a closed position to an open position.

[0019] According to another exemplary embodiment of the present invention, a first piston component has a first piston rod connected to a valve needle, and a second piston component has a second piston rod movable between an extended position and a retracted position, wherein when the second piston rod is moved from the retracted position to the extended position, the first piston component is pushed by the second piston component from a second position to a third position, and when the first piston component is moved from the first position to the second position, the second piston rod is pushed by the first piston component from the extended position to the retracted position.

[0020] According to another exemplary embodiment of the present invention, two first gas passages connected to the first internal chamber and one second gas passage connected to the second internal chamber are formed in the cylinder body, and the two first gas passages and the one second gas passage are used to connect to a gas control circuit.

[0021] According to another exemplary embodiment of the present invention, the drive device further includes a gas control circuit connected to two first gas passages and one second gas passage of the cylinder to control the movement of the first piston part and the second piston part.

[0022] According to another exemplary embodiment of the present invention, the gas control circuit includes a gas supply source, a pipeline connected between the gas supply source and the cylinder, an electromagnetic valve installed in the pipeline, and a controller used to control the electromagnetic valve.

[0023] According to another aspect of the present invention, an injection molding method is provided. The injection molding method includes S21: preparing the injection device of the injection molding machine; S22: connecting the nozzle of the injection device of the injection molding machine to the injection port of the injection mold; S23: moving the first piston part of the cylinder from the second position to the first position to move the valve needle from the closed position to the open position in order to inject the molten injection material into the cavity of the injection mold; S24: after filling the cavity of the injection mold with the molten injection material, moving the first piston part from the first position to the second position to move the valve needle from the open position to the closed position; <o000090>S25: after the injection molded product is cooled and solidified, pushing the first piston part to the third position by the second piston part to move the valve needle to the separation position away from the injection molded product; S26: opening the injection mold and removing the injection molded product from the injection mold and includes.

[0024] In the foregoing exemplary embodiment according to the present invention, after the injection mold is filled with the molten injection material, the tip of the valve needle is inserted into the injection port of the injection mold, and the molten injection material at the injection port is removed by the valve needle. Therefore, the injection molded product after cooling does not have a protrusion corresponding to the injection port. Thus, the present invention does not require cutting the protrusion caused by the injection port, which not only improves the injection efficiency but also improves the quality of the injection molded product.

[0025] The above and other features of the present invention will become more apparent by describing its exemplary embodiments in detail with reference to the accompanying drawings.

Brief Description of the Drawings

[0026] [Figure 1] FIG. is an illustration of an injection device of an injection molding machine according to an exemplary embodiment of the present invention, in which the valve needle is in the closed position of the nozzle and the nozzle is connected to the injection port of the closed injection mold. [Figure 2] FIG. is an illustration of an injection device of an injection molding machine according to an exemplary embodiment of the present invention, in which the valve needle is in the open position of the nozzle and before the molten injection material is injected into the injection mold. [Figure 3] FIG. is an illustration of an injection device of an injection molding machine according to an exemplary embodiment of the present invention, in which the valve needle is in the open position of the nozzle and the injection mold is filled with the molten injection material. [Figure 4] FIG. is an illustration of an injection device of an injection molding machine according to an exemplary embodiment of the present invention, in which the valve needle is in the closed position of the nozzle and the injection mold is filled with the molten injection material. [Figure 5] FIG. is an illustration of an injection device of an injection molding machine according to an exemplary embodiment of the present invention, in which the valve needle is at a position away from the cooled injection molded product of the injection mold. [Figure 6] FIG. is an illustration of an injection device of an injection molding machine according to an exemplary embodiment of the present invention, in which the injection mold is opened and the injection molded product is taken out. [Figure 7]This is an illustrative diagram of an injection molding machine injection device according to an exemplary embodiment of the present invention, in which the injection molding machine injection device is arranged in a vertical orientation to inject the injection material in a vertical direction. [Figure 8] This is an illustrative diagram of an injection molding machine injection device according to an exemplary embodiment of the present invention, in which the injection molding machine injection device is arranged in an inclined orientation to inject the injection material along the inclined direction. [Modes for carrying out the invention]

[0027] Exemplary embodiments of this disclosure are described below in detail with reference to the accompanying drawings. Similar reference numerals refer to similar elements. However, this disclosure may be embodied in many different forms and should not be construed as being limited to the embodiments described herein. Rather, these embodiments are provided to make this disclosure thorough and complete and to fully convey the concepts of this disclosure to those skilled in the art.

[0028] The following detailed description includes many specific details to enable a full understanding of the disclosed embodiments for illustrative purposes. However, it will be apparent that one or more embodiments may be practiced without these specific details. In other cases, well-known structures and devices are shown schematically to simplify the drawings.

[0029] According to the general concept of the present invention, an injection molding method is provided. The injection molding method includes the steps of: closing an injection mold and connecting the nozzle of an injection molding machine injection device to the injection port of the injection mold; moving the valve needle of the injection molding machine injection device from a closed position that closes the injection port of the nozzle to an open position that opens the injection port of the nozzle, thereby injecting molten injection material into the cavity of the injection mold; after filling the cavity of the injection mold with molten injection material, moving the valve needle from the open position to a closed position so that the tip of the valve needle is inserted into the injection port and slightly embedded in the injection molded product; after the injection molded product has cooled and solidified, moving the valve needle from the closed position back to a separated position away from the injection molded product; and opening the injection mold and removing the injection molded product from the injection mold.

[0030] According to another general concept of the present invention, an injection molding machine injection device is provided. The injection molding machine injection device comprises a nozzle having an end suitable for connection to an injection mold inlet and an injection hole formed at the end; a valve needle movably provided on the nozzle for opening and closing the injection hole; and a drive device adapted to drive the valve needle to move between an open position that opens the injection hole and a closed position that closes the injection hole. After the cavity of the injection mold is filled with molten injection material, the drive device drives the valve needle from the open position to the closed position so that the tip of the valve needle is inserted into the inlet and slightly embedded in the injection molded product, and after the injection molded product has cooled and solidified, the drive device drives the valve needle to move from the closed position back to a separated position away from the injection molded product.

[0031] According to another general concept of the present invention, an injection molding method is provided. The injection molding method includes the steps of: preparing the injection molding machine injection device; connecting the nozzle of the injection molding machine injection device to the injection port of the injection mold; moving the valve needle from a closed position to an open position by moving the first piston part of the cylinder from a second position to a first position in order to inject molten injection material into the cavity of the injection mold; moving the valve needle from an open position to a closed position by moving the first piston part from a first position to a second position after the cavity of the injection mold has been filled with molten injection material; moving the valve needle from an open position to a closed position by pushing the first piston part to a third position with the second piston part after the injection molded product has cooled and solidified; and opening the injection mold and removing the injection molded product from the injection mold.

[0032] Figure 1 shows an illustrative diagram of an injection molding machine injection device 100 according to an exemplary embodiment of the present invention, in which the valve needle 3 is in the closed position closing the nozzle 1 and the nozzle 1 is connected to the inlet 4a of the closed injection mold 4. Figure 2 shows an illustrative diagram of an injection molding machine injection device 100 according to an exemplary embodiment of the present invention, in which the valve needle 3 is in the open position of the nozzle 1 and the injection mold 4 is in a state before being filled with molten injection material. Figure 3 shows an illustrative diagram of an injection molding machine injection device 100 according to an exemplary embodiment of the present invention, in which the valve needle 3 is in the open position opening the nozzle 1 and the injection mold 4 is in a state after being filled with molten injection material. Figure 4 shows an illustrative diagram of an injection molding machine injection device 100 according to an exemplary embodiment of the present invention, in which the valve needle 3 is in the closed position that closes the nozzle 1 and the injection mold 4 is filled with molten injection material. Figure 5 shows an illustrative diagram of an injection molding machine injection device 100 according to an exemplary embodiment of the present invention, in which the valve needle 3 is located away from the cooled injection molded product 5 in the injection mold 4. Figure 6 shows an illustrative diagram of an injection molding machine injection device 100 according to an exemplary embodiment of the present invention, in which the injection mold 4 is open and the injection molded product 5 has been removed.

[0033] As shown in Figures 1 to 6, an exemplary embodiment of the present invention discloses an injection molding method. The injection molding method is as follows: S11: As shown in Figure 1, the step of closing the injection mold 4 and connecting the nozzle 1 of the injection molding machine injection device 100 to the injection port 4a of the injection mold 4, S12: As shown in Figures 2 and 3, the valve needle 3 of the injection molding machine injection device 100 is moved from a closed position that closes the injection hole 11 of the nozzle 1 to an open position that opens the injection hole 11 of the nozzle 1, thereby injecting the molten injection material into the cavity 40 of the injection mold 4. S13: As shown in Figure 4, after filling the cavity 40 of the injection mold 4 with molten injection material, the valve needle 3 is moved from the open position to the closed position so that the tip 3a of the valve needle 3 is inserted into the injection port 4a and slightly embedded in the injection molded product 5. S14: As shown in Figure 5, after the injection molded product 5 has cooled and solidified, the valve needle 3 is moved from the closed position back to the separated position away from the injection molded product 5, thereby preventing the demolding of the injection molded product 5 from being obstructed by the valve needle 3. S15: As shown in Figure 6, the step of opening the injection mold 4 and removing the injection molded product 5 from the injection mold 4. Includes.

[0034] In the above-described exemplary embodiment of the present invention, after the injection mold 4 is filled with molten injection material, the tip 3a of the valve needle 3 is inserted into the injection port 4a of the injection mold 4, and the molten injection material in the injection port 4a is removed by the valve needle 3. As a result, the injection molded product 5 after cooling does not have a protrusion corresponding to the injection port 4a. Therefore, the present invention not only improves injection efficiency but also improves the quality of the injection molded product because it does not require cutting off the protrusion caused by the injection port 4a.

[0035] As shown in Figures 1 to 6, in the illustrated embodiment, in step S14, the distance traveled by the valve needle 3 from the closed position back to the separated position is slightly greater than the depth to which the tip 3a of the valve needle 3 is embedded in the injection molded product 5.

[0036] As shown in Figures 1 to 6, in the illustrated embodiment, the distance traveled by the valve needle 3 from the closed position back to the separated position is in the range of 0.1 mm to 1.0 mm.

[0037] As shown in Figures 1 to 6, in the illustrated embodiment, in step S13, the depth to which the tip 3a of the valve needle 3 is embedded in the injection molded product 5 is in the range of 0.05 mm to 0.2 mm.

[0038] As shown in Figures 1 to 6, in the illustrated embodiment, when the valve needle 3 is moved to the separated position in step S14, the injection hole 11 of the nozzle 1 remains closed by the valve needle 3.

[0039] As shown in Figures 1 to 6, another exemplary embodiment of the present invention discloses an injection molding machine injection device. The injection molding machine injection device includes a nozzle 1, a valve needle 3, and a drive device for driving the movement of the valve needle 3. The nozzle 1 has an end suitable for connection to the inlet 4a of an injection mold 4, and an injection hole 11 formed at the end. The valve needle 3 is movably mounted on the nozzle 1 and is used to open and close the injection hole 11 of the nozzle 1. The drive device is suitable for driving the valve needle 3 to move between an open position that opens the injection hole 11 and a closed position that closes the injection hole 11.

[0040] As shown in Figures 1 to 6, in the illustrated embodiment, after the cavity 40 of the injection mold 4 is filled with molten injection material, the drive device drives the valve needle 3 from the open position to the closed position so that the tip 3a of the valve needle 3 is inserted into the injection port 4a and slightly embedded in the injection molded product 5. After the injection molded product 5 has cooled and solidified, the drive device moves the valve needle 3 from the closed position back to the separated position away from the injection molded product 5 so that the demolding of the injection molded product 5 is not hindered by the valve needle 3.

[0041] As shown in Figures 1 to 6, in the illustrated embodiment, the distance traveled by the valve needle 3 from the closed position back to the separated position is slightly greater than the depth to which the tip 3a of the valve needle 3 is embedded in the injection molded product 5.

[0042] As shown in Figures 1 to 6, in the illustrated embodiment, the distance traveled by the valve needle 3 from the closed position back to the separated position is in the range of 0.1 mm to 1.0 mm.

[0043] As shown in Figures 1 to 6, in the illustrated embodiment, the depth to which the tip 3a of the valve needle 3 is embedded in the injection molded product 5 is in the range of 0.05 mm to 0.2 mm.

[0044] As shown in Figures 1 to 6, in the illustrated embodiment, when the valve needle 3 is moved to the separated position, the injection hole 11 of the nozzle 1 remains closed by the valve needle 3.

[0045] As shown in Figures 1 to 6, in the illustrated embodiment, the drive device includes a cylinder 2. The cylinder 2 includes a cylinder body 20 and a first piston component 21. A first internal chamber 201 is formed in the cylinder block 20. The first piston component 21 is movably mounted within the first chamber 201 and is movable between a first position (shown in Figures 2 and 3) and a second position (shown in Figures 1 and 4). When the first piston component 21 is moved from the first position to the second position, the valve needle 3 is moved from the open position to the closed position by the first piston component 21.

[0046] As shown in Figures 1 to 6, in the illustrated embodiment, the cylinder 20 also has a second internal chamber 202, which is separate from the first internal chamber 201. The cylinder 2 also includes a second piston component 22 that is movable in the second chamber 202. The second piston component 22 is used to push the first piston component 21 from a second position shown in Figure 4 to a third position shown in Figure 5. When the first piston component 21 is pushed from the second position to the third position by the second piston component 22, the valve needle 3 is moved from the closed position to the separated position by the first piston component 21.

[0047] As shown in Figures 1 to 6, in the illustrated embodiment, the first piston component 21 has a first piston rod 21a connected to the valve needle 3, and the second piston component 22 has a second piston rod 22a that is movable between an extended position and a retracted position. When the second piston rod 22a is moved from the retracted position to the extended position, the first piston component 21 is pushed by the second piston component 22 from the second position to the third position. When the first piston component 21 is moved from the first position to the second position, the second piston rod 22a is pushed by the first piston component 21 from the extended position to the retracted position.

[0048] As shown in Figures 1 to 6, in the illustrated embodiment, two first gas passages 2a and one second gas passage 2b are formed in the cylinder 20. The two first gas passages 2a are connected to the first internal chamber 201, and the one second gas passage 2b is connected to the second internal chamber 202. The two first gas passages 2a and the one second gas passage 2b are used to connect to a gas control circuit (not shown).

[0049] As shown in Figures 1 to 6, in the illustrated embodiments, the drive device also includes a gas control circuit. This gas control circuit is connected to two first gas passages 2a and one second gas passage 2b of the cylinder 2 and is used to control the movement of the first piston component 21 and the second piston component 22. Typically, the gas control circuit includes a gas supply source (not shown), a pipeline (not shown) connected between the gas supply source and the cylinder 2, a solenoid valve (not shown) installed in the pipeline, and a controller (not shown) for controlling the solenoid valve. It should be noted that the design of a gas control circuit that meets the requirements is not unique and can have various variations.

[0050] Figures 1 to 6 show specific exemplary embodiments of the drive device according to the present invention, but the drive device of the present invention is not limited to the illustrated embodiments.

[0051] Although not shown in the figures, in another exemplary embodiment of the present invention, the drive device may include a linear electric cylinder and a controller for controlling the linear electric cylinder. The actuating part of the linear electric cylinder is connected to a valve needle 3, so that the valve needle 3 can move linearly together with the actuating part. The controller is used to control the movement of the actuating part of the linear electric cylinder, thereby allowing the valve needle 3 to move precisely to the open, closed, and separated positions.

[0052] Although not shown in the figures, in another exemplary embodiment of the present invention, the drive device may include a servo motor, a transmission mechanism connected between the servo motor and the valve needle 3, and a controller for controlling the servo motor. The transmission mechanism is used to convert the rotational motion of the servo motor into linear motion of the valve needle 3. The controller is used to control the rotation of the servo motor, thereby enabling the valve needle 3 to move precisely to the open, closed, and separated positions.

[0053] As shown in Figures 1 to 6, in another exemplary embodiment of the present invention, an injection molding method is also disclosed. The injection molding method is: S21: A step of preparing the injection molding machine injection device 100 shown in Figures 1 to 6, S22: As shown in Figure 1, the step of connecting the nozzle 1 of the injection molding machine injection device 100 to the injection port 4a of the injection mold 4, S23: As shown in Figures 2 and 3, in order to inject the molten injection material into the cavity 40 of the injection mold 4, the first piston part 21 of the cylinder 2 is moved from the second position to the first position, thereby moving the valve needle 3 from the closed position to the open position. S24: As shown in Figure 4, after filling the cavity 40 of the injection mold 4 with molten injection material, the first piston part 21 is moved from the first position to the second position, thereby moving the valve needle 3 from the open position to the closed position. S25: As shown in Figure 5, after the injection molded product 5 has cooled and solidified, the second piston part 22 pushes the first piston part 21 to the third position, thereby moving the valve needle 3 to a separated position away from the injection molded product 5. S26: As shown in Figure 6, the step of opening the injection mold 4 and removing the injection molded product 5 from the injection mold 4. Includes.

[0054] As shown in Figures 1 to 6, in the illustrated embodiment, the tip 3a of the valve needle 3 is slightly embedded in the injection-molded product 5 before cooling during the injection molding process, thereby forming shallow holes 5a on the surface of the injection-molded product 5 after it has cooled and solidified. These shallow holes 5a do not affect the quality of the injection-molded product 5.

[0055] As shown in Figures 1 to 6, in the illustrated embodiments, the injection molding machine injection device 100 is positioned horizontally. That is, the injection hole 11 of the nozzle 1 is horizontal, allowing the injection material to be injected horizontally into the injection mold 4. However, the present invention is not limited thereto, and the injection molding machine injection device 100 can also be positioned in any direction within 360 degrees. For example, Figure 7 shows an illustrative diagram of the injection molding machine injection device 100 according to another exemplary embodiment of the present invention, in which the injection molding machine injection device 100 is positioned vertically to inject the injection material vertically. Figure 8 shows an illustrative diagram of the injection molding machine injection device 100 according to another exemplary embodiment of the present invention, in which the injection molding machine injection device 100 is positioned inclined to inject the injection material along an inclined direction.

[0056] Those skilled in the art will understand that the above embodiments are illustrative and not intended to be limiting. For example, many modifications to the above embodiments may be made by those skilled in the art, and the various features described in different embodiments may be freely combined with each other without structural or principle contradiction.

[0057] While several exemplary embodiments have been illustrated and described, those skilled in the art will understand that various modifications or changes can be made to these embodiments without departing from the principles and spirit of the disclosure. The scope of the disclosure is defined in the claims and its equivalents.

[0058] In this specification, elements described in the singular and preceded by the words "a" or "an" should be understood not to exclude multiple such elements or steps unless otherwise specified. Furthermore, references to “one embodiment” of the present invention are not intended to be construed as excluding the existence of additional embodiments that similarly incorporate the described features. Moreover, unless otherwise specified to the contrary, embodiments “comprising” or “having” one or more elements having a particular characteristic may include additional such elements that do not possess that characteristic.

Claims

1. An injection molding method, S11: The step of closing the injection mold (4) and connecting the nozzle (1) of the injection molding machine injection device (100) to the injection port (4a) of the injection mold (4), S12: The step of moving the valve needle (3) of the injection molding machine injection device (100) from a closed position that closes the injection hole (11) of the nozzle (1) to an open position that opens the injection hole (11) of the nozzle (1), thereby injecting the molten injection material into the cavity (40) of the injection mold (4), S13: After filling the cavity (40) of the injection mold (4) with molten injection material, move the valve needle (3) from the open position to the closed position so that the tip (3a) of the valve needle (3) is inserted into the injection port (4a) and slightly embedded in the injection molded product (5), S14: After the injection molded product (5) has cooled and solidified, the step of moving the valve needle (3) from the closed position back to a separated position away from the injection molded product (5), S15: The step of opening the injection mold (4) and removing the injection molded product (5) from the injection mold (4) An injection molding method including [a specific component].

2. The injection molding method according to claim 1, wherein in step S14, the distance the valve needle (3) travels from the closed position back to the separated position is slightly greater than the depth to which the tip (3a) of the valve needle (3) is embedded in the injection molded product (5).

3. The injection molding method according to claim 2, wherein the distance traveled by the valve needle (3) from the closed position back to the separated position is within the range of 0.1 mm to 1.0 mm.

4. The injection molding method according to claim 2, wherein in step S13, the depth to which the tip (3a) of the valve needle (3) is embedded in the injection molded product (5) is in the range of 0.05 mm to 0.2 mm.

5. In step S14, when the valve needle (3) is moved to the separated position, the injection hole (11) of the nozzle (1) remains closed, closed by the valve needle (3), as described in claim 1.

6. Injection molding machine injection device, A nozzle (1) having an end suitable for connection to the injection port (4a) of an injection type (4), and an injection hole (11) formed at the end, A valve needle (3) is movably provided on the nozzle (1) to open and close the injection hole (11), A drive device adapted to drive the valve needle (3) to move between an open position that opens the injection hole (11) and a closed position that closes the injection hole (11), Equipped with, After filling the cavity (40) of the injection mold (4) with molten injection material, the drive device drives the valve needle (3) to move from the open position to the closed position so that the tip (3a) of the valve needle (3) is inserted into the injection port (4a) and slightly embedded in the injection molded product (5). After the injection-molded product (5) has cooled and solidified, the drive device drives the valve needle (3) to move it from the closed position back to a separated position away from the injection-molded product (5). Injection molding machine injection device.

7. The injection molding machine injection device according to claim 6, wherein the distance the valve needle (3) travels from the closed position back to the separated position is slightly greater than the depth to which the tip (3a) of the valve needle (3) is embedded in the injection molded product (5).

8. The injection molding machine injection device according to claim 6, wherein the distance traveled by the valve needle (3) from the closed position back to the separated position is within the range of 0.1 mm to 1.0 mm.

9. The injection molding machine injection device according to claim 6, wherein the depth to which the tip (3a) of the valve needle (3) is embedded in the injection molded product (5) is in the range of 0.05 mm to 0.2 mm.

10. The injection molding machine injection device according to claim 6, wherein when the valve needle (3) is moved to the separated position, the injection hole (11) of the nozzle (1) remains closed, closed by the valve needle (3).

11. The injection molding machine injection device according to claim 6, wherein the drive device comprises a linear electric cylinder and a controller for controlling the linear electric cylinder, and the actuation part of the linear electric cylinder is connected to the valve needle (3), so that the valve needle (3) can move linearly together with the actuation part.

12. The injection molding machine injection device according to claim 6, wherein the drive device comprises a servo motor, a transmission mechanism connected between the servo motor and the valve needle (3), and a controller for controlling the servo motor, the transmission mechanism being used to convert the rotational motion of the servo motor into the linear motion of the valve needle (3).

13. The drive device comprises a cylinder (2), The cylinder (2) is A cylinder body (20) in which a first internal chamber (201) is formed, A first piston component (21) is movably provided in the first internal chamber (201) and is movable between a first position and a second position. Equipped with, The injection molding machine injection device according to claim 6, wherein when the first piston component (21) is moved from the first position to the second position, the valve needle (3) is moved by the first piston component (21) from the open position to the closed position.

14. The cylinder body (20) also has a second internal chamber (202) formed in it, which is separate from the first internal chamber (201). The cylinder (2) further comprises a second piston component (22) movably disposed within the second internal chamber (202), The second piston component (22) is used to push the first piston component (21) from the second position to the third position. The injection molding machine injection device according to claim 13, wherein when the first piston component (21) is pushed from the second position to the third position by the second piston component (22), the valve needle (3) is moved from the closed position to the separated position by the first piston component (21).

15. The first piston component (21) has a first piston rod (11a) connected to the valve needle (3), and the second piston component (22) has a second piston rod (22a) that is movable between an extended position and a retracted position. When the second piston rod (22a) is moved from the retracted position to the extended position, the first piston component (21) is pushed from the second position to the third position by the second piston component (22). The injection molding machine injection device according to claim 14, wherein when the first piston component (21) is moved from the first position to the second position, the second piston rod (22a) is pushed by the first piston component (21) from the extended position to the retracted position.

16. The injection molding machine injection device according to claim 15, wherein two first gas passages (2a) connected to the first internal chamber (201) and one second gas passage (2b) connected to the second internal chamber (202) are formed in the cylinder body (20), and the two first gas passages (2a) and the one second gas passage (2b) are used to connect to a gas control circuit.

17. The injection molding machine injection device according to claim 16, further comprising a gas control circuit connected to the two first gas passages (2a) and the one second gas passage (2b) of the cylinder (2) for controlling the movement of the first piston component (21) and the second piston component (22).

18. The aforementioned gas control circuit is Gas supply source, A pipeline connected between the gas supply source and the cylinder (2), An electromagnetic valve installed in the aforementioned pipeline, A controller used to control the aforementioned electromagnetic valve and The injection molding machine injection device according to claim 17, comprising the above.

19. An injection molding method, S21: A step of preparing the injection molding machine injection device (100) described in claim 14, S22: The step of connecting the nozzle (1) of the injection molding machine injection device (100) to the injection port (4a) of the injection mold (4), S23: In order to inject the molten injection material into the cavity (40) of the injection mold (4), the first piston component (21) of the cylinder (2) is moved from the second position to the first position, thereby moving the valve needle (3) from the closed position to the open position, S24: After filling the cavity (40) of the injection mold (4) with molten injection material, the first piston component (21) is moved from the first position to the second position, thereby moving the valve needle (3) from the open position to the closed position. S25: After the injection molded product (5) has cooled and solidified, the second piston part (22) pushes the first piston part (21) to the third position, thereby moving the valve needle (3) to the separation position away from the injection molded product (5), S26: The step of opening the injection mold (4) and removing the injection molded product (5) from the injection mold (4) An injection molding method including [a specific component].

Images