CN110621465B - Injection device of injection molding machine for foam molding - Google Patents
Injection device of injection molding machine for foam molding Download PDFInfo
- Publication number
- CN110621465B CN110621465B CN201880032341.3A CN201880032341A CN110621465B CN 110621465 B CN110621465 B CN 110621465B CN 201880032341 A CN201880032341 A CN 201880032341A CN 110621465 B CN110621465 B CN 110621465B
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- Prior art keywords
- foaming agent
- heating cylinder
- cylinder head
- sleeve
- injection
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- 238000002347 injection Methods 0.000 title claims abstract description 46
- 239000007924 injection Substances 0.000 title claims abstract description 46
- 238000010097 foam moulding Methods 0.000 title claims description 24
- 238000001746 injection moulding Methods 0.000 title claims description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 67
- 239000004604 Blowing Agent Substances 0.000 claims abstract description 46
- 239000000088 plastic resin Substances 0.000 claims abstract description 44
- 239000011347 resin Substances 0.000 claims abstract description 40
- 229920005989 resin Polymers 0.000 claims abstract description 40
- 239000004088 foaming agent Substances 0.000 claims description 82
- 239000011148 porous material Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 11
- 239000007769 metal material Substances 0.000 abstract description 8
- 239000002184 metal Substances 0.000 description 11
- 239000000843 powder Substances 0.000 description 9
- 239000012530 fluid Substances 0.000 description 7
- 238000009792 diffusion process Methods 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 239000006260 foam Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000013590 bulk material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
- B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/18—Feeding the material into the injection moulding apparatus, i.e. feeding the non-plastified material into the injection unit
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Abstract
The injection device (4) has a heating cylinder (31) accommodating a screw (34), a heating cylinder head (32) provided at the front end of the heating cylinder, and an injection nozzle (33) connected to the front end of the heating cylinder head. A sleeve (61) partially formed of a porous sintered metal material is housed in the heating cylinder head, and a needle member (62) partially formed of a porous sintered metal material is disposed in a center hole (61d) formed in the sleeve. Thus, the physical blowing agent supplied from the physical blowing agent supply device (5) is introduced into the plastic resin stored in the resin reservoir (54) from both the outer peripheral side and the inner peripheral side of the center hole.
Description
Technical Field
The present invention relates to an injection device of an injection molding machine for foam molding, and more particularly to a supply mechanism for supplying a physical foaming agent to a heating cylinder head.
Background
The applicant of the present application has previously proposed an injection device for an injection molding machine for foam molding, which injects supercritical CO2Gas or N2A gas or the like is used as a foaming agent, a sleeve is built in the heating cylinder head, at least a part of the sleeve is formed of a porous material, a central hole constituting a part of the resin passage is opened in a part formed of the porous material, and the sleeve is providedA space for introducing a foaming agent is formed between the outer peripheral surface of the tube and the inner peripheral surface of the heating tube head (see, for example, patent document 1). In the present specification, a supercritical fluid used as a blowing agent is referred to as a "physical blowing agent".
In the injection device described in patent document 1, a supply nozzle for a physical foaming agent is attached to a heating cylinder head, and when the physical foaming agent supplied from the nozzle is injected into a physical foaming agent introduction space (hereinafter, simply referred to as "introduction space") formed between an outer peripheral surface of a sleeve and an inner peripheral surface of the heating cylinder head, the physical foaming agent injected into the introduction space is supplied into a center hole and a resin passage through fine pores of a portion of the sleeve formed of a porous material. Thus, according to the injection device described in patent document 1, as compared with the case where the physical foaming agent is directly supplied into the resin passage of the heating cylinder head from the introduction hole for the physical foaming agent provided in the heating cylinder head, the contact area between the physical foaming agent and the plastic resin is enlarged, so that the diffusion rate of the physical foaming agent into the plastic resin can be increased, the shot cycle (shot cycle) can be shortened, and the quality of the molded product can be made uniform.
Documents of the prior art
Patent document 1: japanese laid-open patent publication No. 2012-232558
Disclosure of Invention
Problems to be solved by the invention
However, the injection molding machine for foam molding needs to further shorten the injection cycle. In order to shorten the shot cycle, it is necessary to further increase the diffusion rate of the physical foaming agent into the plastic resin.
The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide an injection device of an injection molding machine for foam molding, which rapidly diffuses a physical foaming agent into a plastic resin stored in a heating cylinder head, thereby improving productivity of a foam molded product.
Means for solving the problems
In order to solve the above problems, the present invention relates to an injection device of an injection molding machine for foam molding, comprising: a screw having a check ring mechanism for preventing backflow at a front end side thereof, a heating cylinder accommodating the screw rotatably and movably back and forth, a heating cylinder head provided at a front end portion of the heating cylinder, an injection nozzle connected to a front end portion of the heating cylinder head, a foaming agent supply nozzle attached to the heating cylinder head for supplying a physical foaming agent, and a sleeve at least a part of which is formed of a porous material and a central hole having a resin passage is opened at a central portion of the sleeve; injecting and filling a mixture of the plastic resin stored in a resin reservoir taken from a tip end of the screw to a tip end of the injection nozzle and the physical foaming agent supplied from the foaming agent supply nozzle into a cavity of a mold to form a desired foamed molded body; the injection device of the injection molding machine for foam molding is characterized in that the sleeve is housed in the heating cylinder head, a needle member is housed in the central hole opened in the sleeve, at least a part of the needle member is formed of a porous material, and an introduction space for a physical foaming agent supplied from the foaming agent supply nozzle is provided in the central portion of the needle member.
According to the above configuration, since the sleeve is housed in the heating cylinder head, at least a part of the sleeve is formed of a porous material, and the center portion of the sleeve is opened with the center hole having the resin passage, the physical foaming agent injected from the foaming agent supply nozzle spreads in the surface direction of the sleeve through the fine holes of the sleeve, and the plastic resin stored in the resin reservoir is uniformly injected from the entire circumferential direction of the center hole. Further, according to the above configuration, since the needle member, at least a part of which is formed of a porous material, is accommodated in the center hole and the introduction space of the physical foaming agent is provided in the center portion of the needle member, the physical foaming agent injected from the foaming agent supply nozzle first enters the introduction space and spreads in the longitudinal direction of the needle member, and further, the physical foaming agent supplied into the introduction space spreads in the surface direction of the needle member through the fine holes of the needle member and is uniformly injected into the plastic resin stored in the resin reservoir from the entire circumferential direction of the center hole. In this way, according to the above configuration, the physical foaming agent is uniformly discharged to the plastic resin stored in the resin reservoir from both the outer circumferential direction and the inner circumferential direction of the center hole, and therefore, the contact area between the plastic resin and the physical foaming agent can be increased as compared with a case where the physical foaming agent is supplied only from the plastic resin stored in the resin reservoir from the outer circumferential direction of the center hole. Therefore, the physical foaming agent can be diffused rapidly and uniformly into the plastic resin, and the productivity of the foam molded product having a desired quality can be improved.
In the injection molding machine for foam molding of the above configuration, the needle member is held by a torpedo member and is disposed at a central portion of the center hole, the torpedo member is housed in the heating cylinder head, and the torpedo member has a resin circulation hole communicating with the center hole and an introduction hole of a physical foaming agent communicating with the introduction space.
According to the above configuration, the needle member is held by using the torpedo member accommodated in the resin passage, and therefore, the needle member can be stably held in the central hole. Further, according to the above configuration, the needle-shaped member is disposed at the center of the center hole opened in the sleeve, and therefore, the physical foaming agent can be more uniformly diffused into the plastic resin.
In the injection molding machine for foam molding of the above configuration, the needle member is formed separately from the torpedo member and is screwed to the torpedo member.
According to the above configuration, since the needle member formed of the porous material is formed separately from the torpedo member formed of the block material, the parts can be easily manufactured and the manufacturing cost of the whole can be reduced, as compared with a case where the part corresponding to the needle member and the part corresponding to the torpedo member are integrally formed by, for example, laser processing. In addition, when the needle-shaped part or the torpedo-shaped part is damaged, only necessary components are replaced, so that the economy is good. Further, according to the above configuration, the pin member is screwed to the torpedo member, and the pin member and the torpedo member can be easily assembled.
In the injection molding machine for foam molding of the above configuration, the present invention is characterized in that an introduction space for a physical foaming agent supplied from the foaming agent supply nozzle is formed between the heating cylinder head and the sleeve.
According to the above configuration, since the physical blowing agent introduction space is formed between the heating cylinder head and the sleeve, the physical blowing agent supplied from the blowing agent supply nozzle spreads in the longitudinal direction of the heating cylinder head, and then the plastic resin stored in the resin reservoir is uniformly dispensed from the entire circumferential direction of the center hole through the fine holes of the sleeve. This makes it possible to diffuse the physical foaming agent more rapidly and uniformly into the plastic resin than in the case where no space for introducing the physical foaming agent is formed between the heating cylinder head and the sleeve.
In the injection molding machine for foam molding of the above configuration, the blowing agent supply nozzle is formed by combining a first blowing agent supply nozzle for supplying a physical blowing agent into the introduction space formed between the heater cylinder head and the sleeve, and a second blowing agent supply nozzle for supplying a physical blowing agent into the introduction space provided at a central portion of the needle-shaped member.
According to the above configuration, since the foam molding injection molding machine has 2 blowing agent supply nozzles, a predetermined amount of physical blowing agent can be introduced into the plastic resin in a shorter time than the case where only 1 blowing agent supply nozzle is provided.
ADVANTAGEOUS EFFECTS OF INVENTION
The present invention can supply the physical foaming agent into the plastic resin stored in the center hole from both the outside and the inside of the center hole constituting a part of the resin passage, and therefore, the diffusion speed of the physical foaming agent into the plastic resin can be increased, and the physical foaming agent can be uniformly diffused into the plastic resin. Thus, according to the present invention, a foam molded product having a desired quality can be efficiently produced.
Drawings
Fig. 1 is a configuration diagram of an injection molding machine for foam molding including an injection device according to the present embodiment.
Fig. 2 is an enlarged sectional view of a main part of the injection device of the present embodiment.
Fig. 3 is a sectional view showing a first example of the sleeve of the present embodiment.
Fig. 4 is a sectional view showing a second example of the sleeve of the present embodiment.
Fig. 5 is a cross-sectional view showing a screwing state of the needle member and the torpedo member according to the present embodiment.
Fig. 6 is a sectional view taken along line a-a in fig. 5.
Detailed Description
An embodiment of the injection device of the present invention will be described below with reference to the drawings. The embodiments described below are merely examples of embodying the present invention, and the scope of the present invention is not limited to the embodiments described above. Therefore, the present invention can be implemented with various modifications in the embodiments.
First, the entire foam molding injection molding machine 1 including the injection device of the present embodiment will be described with reference to fig. 1. As shown in fig. 1, the injection molding machine 1 for foam molding in this example includes an open/close mold and clamping unit 3 and an injection device 4 that are arranged on a frame 2 so as to face each other, and a physical blowing agent supply device 5 that supplies a physical blowing agent to the injection device 4.
The mold opening/closing and mold clamping unit 3 includes: a tailstock 11 and a fixed die plate 12 which are disposed on the frame 2 so as to face each other with a predetermined space therebetween; a movable template 13 disposed between the tailstocks 11 and the fixed template 12 and movably attached to the frame 2; and a toggle mechanism 14 having both ends connected to the tailstock 11 and the movable platen 13. The movable die plate 13 is guided by a link rod 15 having both ends connected to the tailstock 11 and the fixed die plate 12, and moves on the machine frame 2. The fixed die plate 12 is provided with a fixed die 16, and the movable die plate 13 is provided with a movable die 17.
The tailstock 11 is provided with an electric servomotor 18 for mold opening and closing and a nut body 19a of a ball screw mechanism 19 rotatably mounted thereon. A screw shaft 19b of the ball screw mechanism 19 is screwed into the nut body 19a, and a tip end of the screw shaft 19b is connected to a crosshead (cross head)14a of the toggle mechanism 14. The main shaft of the electric servomotor 18 for mold opening and closing and mold clamping is connected to the nut body 19a of the ball screw mechanism 19 by an appropriate rotation transmission mechanism such as a timing belt. Thus, when the electric servo motor 18 for opening and closing the mold is rotated in the normal direction or in the reverse direction, the toggle mechanism 14 is extended or contracted by the ball screw mechanism 19 and the crosshead 14a, and the fixed mold 16 and the movable mold 17 are opened and closed.
Further, the tailstock 11 is provided with a die thickness adjusting motor 20, and a rotatable die thickness adjusting nut 21, and the die thickness adjusting nut 21 is screwed to a screw portion (not shown) formed at an end of the tie rod 15. The spindle of the die thickness adjusting motor 20 is coupled to the gear portion 21a of the die thickness adjusting nut 21 via an appropriate rotation transmission mechanism. Thus, when the die thickness adjusting motor 20 is rotated in the normal direction or the reverse direction in a state where the tailstock 11 is released from being fixed to the frame 2, the die thickness adjusting nut 21 moves in the longitudinal direction of the tie rod 15, and the set position of the tailstock 11 with respect to the frame 2 is adjusted. This enables the die thickness adjustment to be performed after the fixed-side die 16 and/or the movable-side die 17 are replaced.
The injection device 4 has a heating cylinder 31, a heating cylinder head 32 attached to the front end portion of the heating cylinder 31, and an injection nozzle 33 attached to the front end portion of the heating cylinder head 32. A screw 34 that can rotate and move forward and backward is housed inside the heating cylinder 31. Further, a band heater 35 is wound around the outer periphery of the heater tube 31. The heating cylinder 31 is attached to a hopper table (hopper block)36, and the hopper table 36 includes a screw driving unit 37 as a driving source of the screw 34 and a hopper 38 for storing a raw material resin. The heating cylinder 31 receives the supply of the raw material resin stored in the hopper 38 inside the hopper table 36. The hopper table 36 is driven to move forward and backward to a nozzle contact position or a nozzle retreat position by a nozzle contact and retreat motor 39 provided in the frame 2.
The heating cylinder 31 cooperates with the screw 34 to introduce, plasticize, measure, and inject the raw material resin stored in the hopper 38. That is, when the screw 34 is driven to rotate by the screw driving unit 37, the raw material resin stored in the hopper 38 is sequentially introduced into the heating cylinder 31 by the screw conveying action of the screw 34. The raw material resin introduced into the heating cylinder 31 is plasticized by frictional heat and shear heat generated along with the rotation of the screw 34 and by electric heat given by the belt heater 35. The plastic resin is sequentially transferred to the distal end side of the heating cylinder 31 by the screw conveying action of the screw 34, and is measured by a resin amount necessary for one injection. After a predetermined amount of plastic resin is accumulated in the distal end portion of the heating cylinder 31, the drive screw 34 is advanced, and the predetermined amount of plastic resin accumulated in the distal end portion of the heating cylinder 31 is injected into a cavity formed between the fixed-side mold 16 and the movable-side mold 17.
As shown in an enlarged view in fig. 2, the screw 34 includes a screw body 41 having a screw channel portion 41a formed in an outer peripheral surface thereof, and an arrow-shaped screw head 42 attached to a tip end portion of the screw body 41, and a check ring mechanism 43 for preventing backflow is disposed between the screw body 41 and the screw head 42. The retainer mechanism 43 includes a retainer 44 fixed to the screw body 41 and a retainer 45 movably fitted to the screw body 41 so as to be movable forward and backward and rotatable.
In the plasticizing process of the raw material resin, the check ring 45 is moved in a direction away from the check plate 44 by the pressure of the plastic resin transferred from the screw body 41 side to the screw head 42 side, and the check ring mechanism 43 is automatically switched to the on state. Thereby, the plastic resin transferred from the screw body 41 side is transferred to the tip side of the screw head 42 through a gap, not shown, provided between the screw body 41 and the retainer ring 45. When a predetermined amount of plastic resin is accumulated on the tip end side of the screw head 42, the retainer 45 is pressed against the retainer 44 by the pressure, and the retainer mechanism 43 is automatically switched to the non-conductive state. This prevents backflow of the plastic resin during metering and injection of the plastic resin.
Further, since the screw 34 of the present embodiment has the retainer mechanism 43, the physical foaming agent supplied to the heating cylinder head 32 can be prevented from flowing backward. Next, a supply mechanism for supplying the physical foaming agent to the heating cylinder head 32 will be described.
As shown in fig. 2, the heating cylinder head 32 is formed in a cylindrical shape, and a first nozzle mounting hole 52 and a second nozzle mounting hole 53 are formed in the outer peripheral surface thereof. The first nozzle mounting hole 52 and the second nozzle mounting hole 53 also function as introduction holes for the physical foaming agent. A sleeve 61 for dispersedly supplying the physical foaming agent supplied from the physical foaming agent supply device 5 through the first nozzle mounting hole 52 to the plastic resin stored in the resin take-out reservoir 54 from the retainer ring 45 to the tip end portion of the injection nozzle 33, a needle member (needle)62 for dispersedly supplying the physical foaming agent supplied from the physical foaming agent supply device 5 through the second nozzle mounting hole 53 to the plastic resin stored in the resin take-out reservoir 54, and a torpedo member (torpedo)63 for holding the needle member 62 are housed in the heating cylinder head 32.
As shown in fig. 3 and 4, the sleeve 61 is composed of a cylindrical portion 61a and flange portions 61b, 61c formed at both end portions of the cylindrical portion 61a, and has a center hole 61d formed therethrough from an end surface of the flange portion 61b to an end surface of the flange portion 61 c. In the example shown in fig. 3 and 4, the flange portion 61b is formed to have a larger outer diameter than the flange portion 61c, but the gist of the present invention is not limited to this. That is, the outer diameters of the flanges 61b and 61c may be set to a size that can stably hold the sleeve 61 in the heater cylinder head 32. The sleeve 61 is housed in the heating cylinder head 32 such that the center of the cylindrical portion 61a in the longitudinal direction substantially coincides with the central axis of the first nozzle attachment hole 52 formed in the heating cylinder head 32.
As described above, since the sleeve 61 of the present example is composed of the small-diameter cylindrical portion 61a and the large- diameter flange portions 61b and 61c formed at both end portions of the cylindrical portion 61a, when the sleeve 61 is set at a predetermined position in the heating cylinder head 32, the annular physical blowing agent introduction space 61f communicating with the first nozzle attachment hole 52 is formed. The physical blowing agent introduction space 61f has a function of expanding the physical blowing agent supplied from the first nozzle attachment hole 52 in the surface direction of the cylindrical portion 61 a.
The cylindrical portion 61a of the sleeve 61 shown in fig. 3 is entirely formed of a porous sintered metal material having a porosity of 5% to 60%, and the flange portions 61b and 61c are formed of a bulk material (bulk material). In this way, when the entire cylindrical portion 61a is formed of the porous sintered metal material, the physical blowing agent can be supplied into the resin reservoir 54 through the entire cylindrical portion 61a, so that the diffusion rate of the physical blowing agent into the plastic resin stored in the resin reservoir 54 can be made most efficient, and the productivity of the foam molded product can be made optimal. Further, since the porosity of the cylindrical portion is set to 5% to 60%, the physical foaming agent can be quickly and sufficiently discharged into the plastic resin, and the mechanical strength of the sleeve 61 can be appropriately maintained.
In contrast, the sleeve 61 shown in fig. 4 has a reinforcing portion 61e formed of a block material in the longitudinal direction and the circumferential direction of the cylindrical portion 61a, and only a portion surrounded by the reinforcing portion 61e is formed of a porous sintered metal material having a porosity of 5% to 60%. In the sleeve 61 of the present example, the cylindrical portion 61a is provided with the reinforcing portion 61e made of a block material, so that the sleeve 61 has high mechanical strength and excellent durability. In fig. 3 and 4, the portions formed by the porous sintered metal material are shown by dot patterns.
The sleeve 61 shown in fig. 3 and 4 can be manufactured by laser processing. That is, when a high-level laser beam is irradiated to a metal powder (including an alloy powder), the heat of the laser beam melts the metal powder completely, and the metal powder is solidified to form a bulk material, and when a low-level laser beam is irradiated, the heat of the laser beam melts only a part of the metal powder, and the metal powder is solidified to form a porous sintered metal. Further, it is also possible to alternately form the portions of the porous sintered metal and the portions of the bulk material in the circumferential direction by appropriately switching the laser power in the circumferential direction of the metal powder layer. Therefore, the sleeve 61 having a desired shape can be produced by repeating the stacking of the metal powder layers in the thickness direction and the laser irradiation of each metal powder layer, and finally performing the necessary finishing. The porosity of the porous sintered metal can be adjusted by varying the laser power.
As shown in fig. 5 in an enlarged manner, the needle member 62 is formed in a bottomed cylindrical shape having a male screw 62a at one end, and at least a portion other than the male screw 62a is formed of a porous sintered metal material having a porosity of 5% to 60%. At the center of the needle member 62, a physical blowing agent introduction space 62b is formed to penetrate the end of the male screw 62 a. The introduction space 62b has a function of expanding the physical foaming agent supplied from the physical foaming agent supply device 5 through the second nozzle mounting hole 53 in the longitudinal direction of the needle member 62. The needle member 62 can be manufactured in the same manner as the sleeve 61.
As shown in fig. 5 and 6, the torpedo 63 is formed in a cylindrical shape having a diameter that can be inserted into the heating cylinder head 32, and a female screw 63a for screwing with the male screw 62a of the needle 62 is formed in the center of one end of the torpedo 63. Further, an introduction hole 63b for a physical foaming agent and a resin flow hole 63c are opened in the torpedo-shaped member 63, and when the torpedo-shaped member 63 is accommodated at a predetermined position in the heating cylinder head 32, the introduction hole 63b extends from a position facing the second nozzle mounting hole 53 opened in the heating cylinder head 32 to a central portion of the female screw 63a, and the resin flow hole 63c communicates with the center hole 61d opened in the sleeve 61. The pin member 62 is formed integrally with the torpedo member 63 by screwing the male screw 62a and the female screw 63 a. As shown in fig. 2, the torpedo 63 with the pin 62 screwed thereto is housed in the heating cylinder head 32 such that the pin 62 is disposed in the center hole 61d of the sleeve 61.
The resin flow hole 63c is formed in a shape and a size such that a pressure loss of the plastic resin flowing through the resin flow hole 63c is as small as possible. Therefore, as shown in fig. 6, in the torpedo 63 of the present example, 4 resin flow holes 63c formed in a fan shape are equally arranged on a circumference around the axial center O of the torpedo 63. The shape of the resin flow holes 63c is not limited to a fan shape, and may be formed in a circular shape, and the number thereof may be changed as appropriate.
As shown in FIG. 1, the physical blowing agent supply apparatus 5 includes a gas cylinder 71, a supercritical fluid generating apparatus 72, a first blowing agent supply nozzle 73, a second blowing agent supply nozzle 74, and an on-off valve 76, and the gas cylinder 71 stores CO2Gas or N2A material gas such as a gas, the supercritical fluid generation means 72 forms the material gas supplied from the gas cylinder 71 into a physical blowing agent in a supercritical state by performing high-temperature and high-pressure treatment, the first blowing agent supply nozzle 73 injects the physical blowing agent supplied from the supercritical fluid generation means 72 into the introduction space 61f, the second blowing agent supply nozzle 74 injects the physical blowing agent supplied from the supercritical fluid generation means 72 into the introduction space 62b, and the on-off valve 76 is provided in a pipeline 75 connecting the supercritical fluid generation means 72 with the first blowing agent supply nozzle 73 and the second blowing agent supply nozzle 74.
The first blowing agent supply nozzle 73 is attached to the first nozzle mounting hole 52 provided in the heater cylinder head 32, and the second blowing agent supply nozzle 74 is attached to the second nozzle mounting hole 53 provided in the heater cylinder head 32. The first foamer supplying nozzle 73 can be attached to the first nozzle attachment hole 52 by, for example, engraving a female screw in the first nozzle attachment hole 52 and engraving a male screw in the outer periphery of the tip end portion of the first foamer supplying nozzle 73, and screwing the male screw and the female screw. The mounting of the second blowing agent supply nozzle 74 with respect to the second nozzle mounting hole 53 can be performed in the same manner. The supply of the physical foaming agent into the heating cylinder head 32 is performed by opening the on-off valve 76 during or after the measurement step for each shot performed by the injection molding machine 1 for foam molding.
The physical foaming agent injected from the first foaming agent supply nozzle 73 into the introduction space 61f passes through fine holes of a portion formed of the porous sintered metal material of the cylindrical portion 61a formed in the sleeve 61 and reaches the center hole 61d of the sleeve 61. The physical foaming agent injected from the second foaming agent supply nozzle 74 is supplied into the introduction space 62b of the needle member 62 through the introduction hole 63b opened in the torpedo 63, and reaches the center hole 61d of the sleeve 61 through the minute hole of the needle member 62. Thereby, the physical foaming agent comes into contact with the plastic resin stored in the resin reservoir 54, and the physical foaming agent diffuses into the plastic resin.
After the weighing step, when the drive screw 34 moves forward, the plastic resin containing the physical foaming agent is injected into the cavity formed between the fixed mold 16 and the movable mold 17, and a foam molded product having a predetermined shape is produced.
Next, the effects of the injection device 4 configured as described above will be described.
The injection device 4 of the present embodiment has a structure in which the physical foaming agent is supplied from the plastic resin stored in the resin reservoir 54, which is located on both the outer peripheral side and the inner peripheral side of the center hole 61d provided in the sleeve 61.
Accordingly, the injection device 4 of the present embodiment can increase the diffusion rate of the physical foaming agent into the plastic resin and improve the productivity of the foam-molded product, as compared with a conventional injection molding machine for foam molding in which the physical foaming agent is supplied only from the outer peripheral side of the center hole 61d provided in the sleeve 61 to the plastic resin.
Further, the injection device 4 of the present embodiment is disclosed as having a structure in which the needle member 62 is held by the torpedo member 63 housed in the heating cylinder head 32 and is disposed at the center of the center hole 61d provided in the sleeve 61.
Thus, in the injection device 4 of the present embodiment, the needle member 62 can be stably held at the center of the center hole 61d, and therefore the physical foaming agent can be more uniformly diffused into the plastic resin stored in the resin reservoir 54.
The injection device 4 of the present embodiment has a structure in which the needle part 62 and the torpedo part 63 are separately formed and are integrally assembled by screwing.
Thus, the injection device 4 of the present embodiment can facilitate the manufacture of the needle part 62 and the torpedo part 63, and can be economically advantageous because only necessary members need to be replaced when either the needle part 62 or the torpedo part 63 is damaged. In addition, in the injection device 4 of the present embodiment, the needle member 62 and the torpedo member 63 are integrated by screwing, and thus the needle member 62 and the torpedo member 63 can be easily assembled.
The injection device 4 of the present embodiment has a structure in which a physical blowing agent introduction space 61f is formed between the heating cylinder head 32 and the sleeve 61.
Thus, in the injection device 4 of the present embodiment, the physical foaming agent supplied from the first foaming agent supply nozzle 73 can be expanded in the longitudinal direction of the heating cylinder head 32 and then supplied into the plastic resin stored in the measurement resin reservoir 54, and therefore, the physical foaming agent can be rapidly and uniformly diffused into the plastic resin.
The injection device 4 of the present embodiment is provided with a first blowing agent supply nozzle 73 for supplying a physical blowing agent into an introduction space 61f formed between the heater cylinder head 32 and the sleeve 61, and a second blowing agent supply nozzle 74 for supplying a physical blowing agent into an introduction space 62b provided in the center of the needle member 62.
Thus, the injection device 4 of the present embodiment can introduce a predetermined amount of the physical foaming agent into the plastic resin in a shorter time than the case where only one foaming agent supply nozzle is provided.
The scope of the present invention is not limited to the configurations of the above embodiments. For example, in the above embodiment, the needle member 62 and the torpedo member 63 are integrated by screwing, but instead of this configuration, the needle member 62 and the torpedo member 63 may be integrated by another means such as press fitting. In the above embodiment, the needle member 62 and the torpedo 63 are separately formed, but instead of this, the needle member 62 and the torpedo 63 may be formed integrally. Such a structure also makes it possible to accelerate the diffusion rate of the physical foaming agent into the plastic resin.
The nozzle 33 is attached to the front end of the heating cylinder head 32 by, for example, screwing, and one end of the nozzle 33 abuts against the end of the torpedo 63. Thereby, the sleeve 61 and the torpedo 63 are stably held in the heating cylinder head 32. The method of attaching the nozzle 33 to the heating cylinder head 32 is not limited to the screwing method, and other methods may be used.
Description of the reference numerals
1 an injection molding machine for foam molding, 2a frame, 3a mold opening and closing and clamping unit, 4 an injection device, 5 a physical foaming agent supply device, 11 a tailstock, 12 a fixed platen, 13 a movable platen, 14a toggle mechanism, 15 a connecting rod, 16 a fixed side mold, 17 a movable side mold, 18 an electric motor for mold opening and closing, 20 a mold thickness adjusting motor, 31 a heating cylinder, 32 a heating cylinder head, 33 an injection nozzle, 34 a screw, 35 a belt heater, 36 a hopper table, 37 a screw driving part, 38 a hopper, 39 a motor for nozzle contact and retreat, 41a screw body, 42 a screw head, 43 a retainer mechanism, 44 a retainer, 45 a retainer, 52 a first nozzle mounting hole, 53 a second nozzle mounting hole, 61a sleeve, 61a cylindrical part, 61b, 61c flange part, 61d center hole, 61e reinforcing part, 61f physical foaming agent introduction space, 62 needle part, 62a male screw, 62b physical foaming agent introduction space, 63 torpedo shaped member, 63a internal thread, 63b physical blowing agent introduction hole, 63c resin circulation hole, 71 gas cylinder, 72 supercritical fluid generating means, 73 first blowing agent supply nozzle, 74 second blowing agent supply nozzle, 75 piping, 76 on-off valve.
Claims (4)
1. An injection device of an injection molding machine for foam molding,
comprising:
a screw having a stopper mechanism for preventing backflow on the tip side,
a heating cylinder accommodating the screw rod capable of rotating and moving back and forth,
a heating cylinder head arranged at the front end part of the heating cylinder,
an injection nozzle connected to the front end of the heating cylinder head,
a blowing agent supply nozzle installed at the heating cylinder head for supplying a physical blowing agent, an
A sleeve at least a part of which is formed of a porous material and in which a central hole having a resin passage is opened at a central portion thereof;
injecting and filling a mixture of the plastic resin stored in a resin reservoir taken from a tip end of the screw to a tip end of the injection nozzle and the physical foaming agent supplied from the foaming agent supply nozzle into a cavity of a mold to form a desired foamed molded body;
the injection device of the injection molding machine for foam molding is characterized in that,
a sleeve is housed in the heating cylinder head, a needle member is housed in the central hole opened in the sleeve, at least a part of the needle member is formed of a porous material, and an introduction space for a physical foaming agent supplied from the foaming agent supply nozzle is provided in a central portion of the needle member,
the needle member is held by a torpedo member and disposed at a central portion of the central hole, the torpedo member being housed in the heating cylinder head,
the torpedo-shaped component is provided with a resin circulation hole communicated with the central hole and an introduction hole of a physical foaming agent communicated with the introduction space.
2. The injection device of an injection molding machine for foam molding according to claim 1, wherein the needle member is formed separately from the torpedo member and is screwed to the torpedo member.
3. The injection device of an injection molding machine for foam molding according to claim 1, wherein an introduction space for a physical foaming agent supplied from the foaming agent supply nozzle is formed between the heating cylinder head and the sleeve.
4. The injection device of an injection molding machine for foam molding according to claim 3,
the foaming agent supply nozzle is formed by combining a first foaming agent supply nozzle for supplying a physical foaming agent into the introduction space formed between the heating cylinder head and the sleeve, and a second foaming agent supply nozzle for supplying a physical foaming agent into the introduction space provided at the center of the needle-shaped member.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017098830A JP6893828B2 (en) | 2017-05-18 | 2017-05-18 | Injection equipment of injection molding machine for foam molding |
| JP2017-098830 | 2017-05-18 | ||
| PCT/JP2018/015048 WO2018211863A1 (en) | 2017-05-18 | 2018-04-10 | Injection device of injection molding machine for foam molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110621465A CN110621465A (en) | 2019-12-27 |
| CN110621465B true CN110621465B (en) | 2021-07-30 |
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ID=64274430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880032341.3A Active CN110621465B (en) | 2017-05-18 | 2018-04-10 | Injection device of injection molding machine for foam molding |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6893828B2 (en) |
| CN (1) | CN110621465B (en) |
| WO (1) | WO2018211863A1 (en) |
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| JP2004050566A (en) * | 2002-07-18 | 2004-02-19 | Ge Plastics Japan Ltd | Method for producing thermoplastic resin molded foam having high quality appearance |
| WO2004039552A2 (en) * | 2002-10-28 | 2004-05-13 | Trexel, Inc. | Blowing agent introduction systems and methods |
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| JP4748365B2 (en) * | 2006-06-23 | 2011-08-17 | マツダ株式会社 | Method and apparatus for molding fiber reinforced resin molded product |
| DE502007003920D1 (en) * | 2006-12-14 | 2010-07-08 | Sulzer Chemtech Ag | Porous dosing element with coating |
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2017
- 2017-05-18 JP JP2017098830A patent/JP6893828B2/en active Active
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- 2018-04-10 CN CN201880032341.3A patent/CN110621465B/en active Active
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| US2763208A (en) * | 1953-02-04 | 1956-09-18 | Dayton Rubber Company | Porous rubber products such as printing members and the like, and method for manufacture of the same |
| US3697204A (en) * | 1970-05-07 | 1972-10-10 | Usm Corp | Apparatus for injection molding articles of foam material |
| EP0127961A2 (en) * | 1983-05-11 | 1984-12-12 | Cinpres Limited | Process and apparatus for injection moulding |
| JP2004050566A (en) * | 2002-07-18 | 2004-02-19 | Ge Plastics Japan Ltd | Method for producing thermoplastic resin molded foam having high quality appearance |
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| CN1917995A (en) * | 2004-02-10 | 2007-02-21 | 住友重机械工业株式会社 | Injection moulding machine |
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| CN105922496A (en) * | 2016-06-29 | 2016-09-07 | 安徽三彩工贸有限责任公司 | Polyurethane foaming machine stirrer |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018211863A1 (en) | 2018-11-22 |
| JP6893828B2 (en) | 2021-06-23 |
| JP2018192715A (en) | 2018-12-06 |
| CN110621465A (en) | 2019-12-27 |
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