JP2004306497A - Method and apparatus for changing resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the productivity of a molding machine by automatizing work for purging a molding resin in the molding machine and to enable the automatic operation of the molding machine. <P>SOLUTION: An apparatus has a heating cylinder 21 having a nozzle and a heater, a nozzle insertion hole making a mold fitting surface and a back communicate with each other, a mold support member making a mold be fitted to the mold fitting surface, a purging material receiving pan 42 which is fitted movably to the back of the mold support member and moves between a purging material receiving position and a purging material discharging position, a purging material recovering container 41 fitted to the side of the mold support member corresponding to the purging material discharging position, and a controller which when a purging resin is supplied to the heating cylinder 21 after a molding resin is purged, changes the temperature of the cylinder 21 to a temperature suitable for the purging resin. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus and a method for changing resin.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a molding machine such as an injection molding machine, a molding resin heated and melted in a heating cylinder is injected at a high pressure to fill a cavity space of a mold apparatus. The molded article is formed by cooling and solidifying the resin.
[0003]
To this end, the injection molding machine has a mold device, a mold clamping device, and an injection device, and the mold clamping device has a fixed platen and a movable platen, and the mold clamping cylinder advances and retreats the movable platen to mold. Performs mold closing, mold closing and mold opening of the device.
[0004]
On the other hand, the injection device includes a heating cylinder that heats and melts the molding resin, and an injection nozzle that is attached to a front end of the heating cylinder and injects the molten molding resin. The screw is arranged rotatably and freely forward and backward. Then, the molding resin is injected from an injection nozzle by moving the screw forward by a driving unit disposed at the rear end, and the molding resin is measured by rotating the screw by the driving unit.
[0005]
Incidentally, in the injection molding machine, when any abnormality occurs, the operation of the injection molding machine may be stopped. However, while the operation is stopped, the molding resin staying in the heating cylinder is exposed (exposed) to a high temperature for a long time, and thus deteriorates. In addition, depending on the type of molding resin, there is also one that generates corrosive gas while staying. Therefore, before the operation of the injection molding machine is restarted, the residual molding resin is purged to discharge the deteriorated molding resin remaining in the heating cylinder (for example, see Patent Document 1). Also, when the molding of the molded article is completed, purging is performed to prevent the deteriorated molding resin from remaining in the heating cylinder. Further, even when the same molding machine is used to exchange a different molding resin for molding a molded product, the molding resin is purged and the remaining molding resin before the exchange is discharged from the heating cylinder. It has become.
[0006]
[Patent Document 1]
JP-A-8-300407
[0007]
[Problems to be solved by the invention]
However, in the above-described conventional injection molding machine, a long operation time is required for the operator to perform a purging operation of the molding resin, which reduces the productivity of the injection molding machine, and also automates the operation of the injection molding machine. I couldn't.
[0008]
Usually, even if the residual molding resin is purged, it is difficult to completely discharge the deteriorated molding resin remaining in the heating cylinder. If even a small amount of the deteriorated molding resin remains, in the subsequent molding, the deteriorated molding resin is mixed as an impurity, and the quality of the molded product is deteriorated. Therefore, after purging the residual molding resin, the resin supplied into the heating cylinder is switched from the molding resin to the purging resin, and the heating resin is purged by purging the purging resin. A method of completely discharging the remaining deteriorated molding resin from the inside of the heating cylinder is adopted.
[0009]
However, in general, the melting temperature of the purging resin is lower than the melting temperature of the molding resin, so when switching the resin supplied into the heating cylinder from the molding resin to the purging resin, It is necessary to cool the heating cylinder so that the temperature inside the heating cylinder becomes a temperature suitable for the resin for purging. After the purging of the purging resin is completed and the inside of the heating cylinder is cleaned, it is necessary to heat the heating cylinder to a temperature suitable for the molding resin for subsequent molding. And in the said conventional injection molding machine, it was necessary for the operator to perform the operation | work which changes resin and changes the temperature of a heating cylinder.
[0010]
The present invention solves the above-mentioned conventional problems, enables the purging operation of the molding resin in the molding machine to be automatically performed, improves the productivity of the molding machine, and enables the automatic operation of the molding machine. It is an object of the present invention to provide an apparatus and method for changing resin.
[0011]
[Means for Solving the Problems]
To this end, the resin changing device of the present invention includes a heating cylinder having a nozzle and a heating device, and a nozzle insertion hole communicating with a die mounting surface and a back surface, and the die is mounted on the die mounting surface. A mold support member to be mounted, a purge material receiving tray movably mounted on the back surface of the mold support member and moving between a purge material receiving position and a purge material discharge position, and corresponding to the purge material discharge position. A purge material recovery container attached to a side surface of the mold supporting member, and when supplying the purging resin to the heating cylinder after purging the molding resin, the temperature of the heating cylinder is adjusted to the purge resin. A control device for changing to a temperature.
[0012]
In another resin changing device of the present invention, the purge material receiving tray is suddenly stopped by receiving an impact at the purge material discharge position, and discharges the stored purge material.
[0013]
In still another resin changing device of the present invention, the control device further includes: purging molding resin remaining in the heating cylinder; changing the temperature of the heating cylinder to a temperature suitable for the purging resin; The resin is automatically supplied to the heating cylinder and the purge resin is purged.
[0014]
In still another resin changing device of the present invention, the control device further maintains the temperature of the heating cylinder at a temperature suitable for the molding resin or a temperature suitable for keeping the temperature after purging the purging resin. .
[0015]
In the resin replacement method of the present invention, the purge material receiving tray is moved to the purge material receiving position to accommodate the purge material discharged from the heating cylinder, and the purge material tray is moved to the purge material discharge position to remove the purge material. The temperature of the heating cylinder is changed to a temperature suitable for the purging resin when the purging resin is supplied to the heating cylinder after purging the molding resin.
[0016]
In another resin replacement method according to the present invention, the purge material receiving tray is suddenly stopped by receiving an impact at the purge material discharge position, and discharges the stored purge material.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The resin changing apparatus and method in the present invention can be applied to various molding machines such as an extrusion molding apparatus, a laminator, a transfer molding apparatus, a die cast machine, and an IJ sealing press. In the embodiment, for convenience of description, a case where the present invention is applied to an injection molding machine will be described.
[0018]
FIG. 1 is a front view of a main part of an injection molding machine according to an embodiment of the present invention, and FIG. 2 is a plan view of a purge take-out device of the injection molding machine according to the embodiment of the present invention. FIG. 3 is a side sectional view of a purge take-out device of the injection molding machine according to the embodiment of the present invention, and is a view as viewed in the direction of arrow B in FIG.
[0019]
In FIG. 1, reference numeral 20 denotes an injection device, reference numeral 30 denotes a mold clamping device disposed opposite to the injection device 20, reference numeral 40 denotes a purge removal device, and reference numeral 11 denotes the injection device 20, the mold clamping device 30, and the purge removal device 40. It is a molding machine frame to be supported. In the present embodiment, a case will be described in which an injection molding machine as a resin changing device is a vertical injection molding machine that performs so-called vertical clamping and vertical injection.
[0020]
Here, 31 is a lower platen as a mold supporting member in the mold clamping device 30 and is fixed on the molding machine frame 11. A lower die 32 as a fixed die constituting a die apparatus is mounted on a die mounting surface (upper surface in FIG. 1) of the lower platen 31. Reference numeral 34 denotes an upper platen as a mold supporting member in the mold clamping device 30, which is attached to the molding machine frame 11 so as to be movable in a vertical direction. An upper die 33 as a movable die constituting a die apparatus is mounted on a die mounting surface (lower surface in FIG. 1) of the upper platen 34. Further, the upper platen 34 includes a nozzle insertion hole (not shown) that communicates the mold mounting surface and the back surface.
[0021]
The upper platen 34 is fixed to an upper end of a plurality of, for example, four support rods 35. The support rod 35 is vertically moved by a mold clamping driving device (not shown) provided on the molding machine frame 11. As a result, the upper platen 34 and the upper mold 33 attached to the upper platen 34 are vertically moved. The upper mold 33 is brought into contact with and separated from the lower mold 32 to perform mold closing, mold clamping, and mold opening. The mold clamping drive device is, for example, an actuator using a hydraulic cylinder device, a pneumatic cylinder device, or the like as a drive source. An actuator including a direction changing device may be used. Alternatively, the upper platen 34 may be fixed to the molding machine frame 11 so that the lower platen 31 can be vertically moved by the mold clamping drive device. Further, the upper platen 34 and the lower platen 31 can be moved in the vertical direction.
[0022]
Reference numeral 21 denotes a heating cylinder attached to an injection device main body (not shown). Here, the injection device main body is moved vertically with respect to the molding machine frame 11 by an injection driving device (not shown). The injection drive device is, for example, an actuator having an electric motor such as a servomotor as a drive source and a movement direction conversion device using a ball screw mechanism. However, the drive source is a hydraulic cylinder device, a pneumatic cylinder device, or the like. It may be an actuator.
[0023]
An injection nozzle 23 as a nozzle is provided at a front end (lower end in FIG. 1) of the heating cylinder 21. A plurality of heaters 22 as heating devices are provided on the outer peripheral surface of the heating cylinder 21 to adjust the temperature of the heating cylinder 21. The heating cylinder 21 is provided with a hopper (not shown) for supplying molding resin, and a screw (not shown) is provided inside the heating cylinder 21 in the front-rear direction (the lower part in FIG. ) And rotatably disposed. Here, the screw is moved in the front-rear direction by a screw driving device (not shown) disposed rearward (upward in FIG. 1), and is rotated by a screw rotating device (not shown). The screw driving device is, for example, an actuator having an electric motor such as a servomotor as a driving source and a movement direction changing device by a ball screw mechanism. However, the driving source is a hydraulic cylinder device, a pneumatic cylinder device, or the like. It may be an actuator. The screw rotation device uses an electric motor such as a servomotor as a drive source, and transmits rotation to a rear portion of the screw by a gear, timing belt, chain, or the like (not shown).
[0024]
Then, in the measuring step of the injection device 20, the screw rotating device is driven to rotate the screw, and the screw driving device is driven to retract the screw to a predetermined position (moving upward in FIG. 1). At this time, the heating cylinder 21 is heated to a predetermined temperature by the heater 22, and the molding resin supplied from the hopper is heated and melted in the heating cylinder 21, and the screw retreats as the screw retreats. Is stored in front of (below).
[0025]
Next, in the injection step, the injection driving device is driven to move the injection device main body downward, and the injection nozzle 23 provided at the front end of the heating cylinder 21 is moved to the back of the upper mold 33 (upper side in FIG. 1). Nozzle touch is performed by contacting the nozzle. As shown in FIG. 2, a nozzle through hole 36 is formed in the upper platen 34 so that the injection nozzle 23 that has moved downwardly passes through the nozzle through hole 36 to form an upper mold 33. It can come into contact with the back of the car.
[0026]
Then, since the screw driving device is driven to advance the screw, the molding resin accumulated in front of the screw is injected from the injection nozzle 23, and a sprue, runner, etc. (not shown) formed in the upper mold 33. To fill a cavity (not shown) formed between the lower mold 32 and the upper mold 33. At the time when the molding resin is injected, the mold mating surface of the upper mold 33 and the mold mating surface of the lower mold 32 are in contact with each other and are closed.
[0027]
Here, the molding resin may be a thermoplastic resin or a thermosetting resin, such as PVC (polyvinyl chloride), PS (polystyrene), expanded polystyrene, PP (polypropylene), or PET ( Polyethylene terephthalate), PC (polycarbonate), PMMA (polymethyl methacrylate), HDPE (high-density polyethylene), AS (styrene / acrylonitrile), ABS resin, methacrylic resin, biodegradable resin, etc. You may. Further, a high heat resistant resin, a super engineering plastic, a resin to which a flame retardant is added, a resin to which a filler such as glass fiber is mixed, a resin to which a chemical foaming agent is added, and the like may be used. In the present embodiment, a case will be described in which an aromatic polyamide resin (modified PA6T) whose product name is Arlen (R) (seller: Mitsui Chemicals, Inc.) is used as a molding resin.
[0028]
Reference numeral 41 denotes a purge material recovery container in the purge take-out device 40, which is attached to a side surface (the right surface in FIG. 1) of the upper platen 34 corresponding to a purge material discharge position to be described later. The purge material, which is the resin discharged from the cylinder 21, is collected. Here, the purge material collection container 41 is a container having a shape in which one surface of a substantially rectangular parallelepiped is opened, and is a vertical bottom plate 41a having a horizontal rectangular shape, and vertically surrounding four sides of the bottom plate 41a. It has four side plates 41b formed. The upper edges of the three side plates 41b are located at substantially the same height as the upper surface of the upper platen 34, but the side plates 41b (see FIG. 4) facing the side surfaces of the upper platen 34 to which the purge material collection container 41 is attached. The upper edge of the right side plate 41b) in 1 or 2 is located much higher than the upper surface of the upper platen 34 so as to prevent the purge material from scattering.
[0029]
On the upper surface of the upper platen 34, a purge material receiving tray 42 for accommodating the purge material discharged from the inside of the heating cylinder 21 is disposed in parallel with the upper surface of the upper platen 34, that is, movably in the horizontal direction. Then, it moves between a purge material receiving position and a purge material discharging position which will be described later.
[0030]
In this case, on the upper surface of the upper platen 34, a guide rod 44 extending horizontally and having both ends attached to a guide fixing member 45a and a guide fixing member 45b is provided. The purge material receiving tray 42 is attached to a slide member 43 movably attached to the guide rod 44 so as to move along the guide rod 44 as shown by an arrow C in FIG. It has become. The purge material tray 42 is moved by a tray drive device including an actuator (not shown) such as a pneumatic cylinder device. In this case, the slide member 43 may be constituted by a rodless cylinder so as to function as a tray driving device, and the purge member tray 42 can be moved by the slide member 43. On the rear side (upper side in FIG. 2) of the guide rod 44, the mounting member 46a is provided so that the fixing plate 46 of the guide member is perpendicular to the upper surface of the upper platen 34 and parallel to the slide member 43. And is attached to the upper platen 34 via.
[0031]
Here, the purge material receiving tray 42 is a container having a substantially rectangular parallelepiped shape having two open sides, and is formed vertically so as to surround a horizontal rectangular bottom plate 42a and three sides of the bottom plate 42a. It has three side plates 42b. That is, the purge material receiving tray 42 has a shape like a rectangular parallelepiped having an upper surface and one side surface opened. In this case, the opened side surface is the side surface on the purge material recovery container 41 side, and is the right side surface in FIGS. A predetermined gap (gap) is formed between the lower surface of the bottom plate 42a and the upper surface of the upper platen 34, as shown in FIG. Preferably, the bottom plate 42a and the side plate 42b are made of a metal plate such as stainless steel having a smooth surface so that the purge material is easily peeled off.
[0032]
The purge material receiving tray 42 has a position substantially at the center of the upper platen 34 and directly below the injection nozzle 23, that is, a purge material receiving position, and a purge material recovery container 41 as shown in FIG. It moves between the position of the side surface of the upper platen 34, that is, the purge material discharge position. In this case, the guide fixing member 45a functions as a positioning member for positioning at the purge material receiving position, and the left end of the slide member 43 in FIG. 2 contacts the right end of the guide fixing member 45b in FIG. The purge material receiving tray 42 is positioned at the purge material receiving position. The right end of the slide member 43 in FIG. 2 abuts the left end of the guide fixing member 45a in FIG. 2 to position the purge material receiving tray 42 at the purge material discharge position. At the purge material discharge position, the right side surface of the purge material tray 42, that is, the side surface that is open without the side plate 42b, is positioned substantially flush with the side surface of the upper platen 34.
[0033]
In the present embodiment, the injection molding machine has a control device (not shown). The control device includes arithmetic means such as a CPU and an MPU, storage means such as a magnetic disk and a semiconductor memory, input means such as a keyboard, a mouse, a push button, and a touch panel, a CRT, a liquid crystal display, and an LED (Light Emitting Diode) display. It is a computer including a display unit, a communication interface, and the like. The control device may be configured independently, or may be configured integrally with another control device. The control device controls the overall operation of the injection molding machine, and controls the operation of each device such as the injection device 20, the mold clamping device 30, the purge removal device 40, and the like.
[0034]
Next, an operation of performing a purge in the injection molding machine having the above configuration will be described. First, the operation in the case where the purging is performed manually will be described.
[0035]
FIG. 4 is a first view showing a state in which the purge material receiving tray according to the embodiment of the present invention is at the purge material receiving position, and FIG. FIG. 2 and FIG. 6 are flow charts showing an operation for manually purging in the embodiment of the present invention.
[0036]
When molding a molded article, first, a resin measuring step is performed, a screw rotating device is driven to rotate the screw, and a screw driving device is driven to retract the screw to a predetermined position. Then, the molding resin is supplied into the heating cylinder 21 from the hopper in the form of resin pellets or the like. The heating cylinder 21 is heated to a predetermined temperature by a heater 22, and the resin supplied from the hopper is heated and melted in the heating cylinder 21, and is moved forward of the screw with the retreat of the screw. Can be stored. When a predetermined amount of resin is accumulated in front of the screw, the injection driving device is driven to move the injection device body downward, and the injection nozzle 23 is brought into contact with the back surface of the upper mold 33 to perform nozzle touch. Is performed.
[0037]
In this case, the purge material receiving tray 42 has been moved in advance and held at the purge material discharge position as shown in FIG. In this case, since the purge material receiving tray 42 does not hinder the movement of the heating cylinder 21 and the injection nozzle 23, the injection nozzle 23 passes through the nozzle through hole 36 and contacts the back surface of the upper mold 33. be able to.
[0038]
Subsequently, in the injection step, the screw driving device is driven to advance the screw, so that the resin accumulated in front of the screw is injected from the injection nozzle 23 and is formed in the upper mold 33 as shown in FIG. After passing through a sprue, a runner, or the like, which is not performed, the resin is filled into a cavity formed between the lower mold 32 and the upper mold 33.
[0039]
Subsequently, when the resin filled in the cavity is cooled and solidified to form a molded product, the mold clamping driving device is driven to move the upper platen 34 upward. The mold 33 is separated from the lower mold 32 and the mold is opened. In this case, the injection device main body is moved in the upward direction in advance, so that the injection nozzle 23 does not come into contact with the back surface of the upper mold 33 even when the upper platen 34 moves in the upward direction.
[0040]
Then, when the molded product is taken out from the cavity, the mold clamping driving device is driven again, and the upper platen 34 moves downward. As a result, the mold apparatus including the lower mold 32 and the upper mold 33 is again in a mold-closed state. Then, the injection step is performed again. Thereafter, the above-described operation is repeated, and a plurality of molded products are molded. The operation of molding the molded product in the injection molding machine may be performed manually by an operator, or may be performed automatically by being controlled by a control device.
[0041]
Subsequently, when a predetermined number of molded articles are molded, the molding is stopped, and the molding resin remaining in the heating cylinder 21 is purged. In this case, the operator operates the input means of the control device, for example, by pressing a resin exchange button provided on the input means, to start the operation of resin exchange. When the operation of resin replacement is started, first, the control device drives the injection driving device to move the injection device body upward. Thereby, as shown in FIG. 5, the injection nozzle 23 disposed at the front end of the heating cylinder 21 reaches above the upper surface of the upper platen 34.
[0042]
Subsequently, after waiting until the injection device reaches the upper limit position, the control device drives the tray driving device to move the purge material tray 42 from the purge material discharge position to the purge material receiving position as shown in FIG. , That is, forward (moving leftward in FIG. 4 or 5). Subsequently, purging of the remaining molding resin is started, the screw rotating device is driven to rotate the screw, and the screw driving device is driven to advance the screw. Thus, the molding resin remaining in the heating cylinder 21 is discharged from the injection nozzle 23 as a purge material. In this case, the purge material discharged from the tip of the injection nozzle 23 becomes a lump and is placed on the bottom plate 42a of the purge material tray 42 at the purge material receiving position corresponding to directly below the injection nozzle 23, and It is stored in the material tray 42. Even if the purge material discharged from the tip of the injection nozzle 23 collides with the bottom plate 42a of the purge material tray 42 and rebounds, the three side plates 42b vertically formed so as to surround three sides of the bottom plate 42a. , Is prevented from scattering around. Further, the purge material that has bounced toward the open side surface (the right side in FIG. 4) is also prevented from being scattered by the right side plate 41b in FIG. Therefore, the periphery of the injection molding machine is not contaminated by the purge material.
[0043]
When the purge material is stored in the purge material tray 42, the control device drives the tray drive device to move the purge material tray 42 from the purge material receiving position to the purge material discharge position as shown in FIG. Move up to In this case, the right end of the slide member 43 in the drawing comes into contact with the left end of the guide fixing member 45b in the drawing, so that the purge material receiving tray 42 is suddenly stopped at the purge material discharge position. By providing another stopper member and making the purge material tray 42 abut against the stopper member, the purge material tray 42 can be suddenly stopped at the purge material discharge position. Therefore, the purge material placed on the bottom plate 42a of the purge material tray 42 is discharged from the purge material tray 42, which has been suddenly stopped at the purge material discharge position, in the traveling direction by inertia, that is, rightward in the drawing.
[0044]
Note that the purge material placed on the bottom plate 42a has a relatively high temperature, and therefore has some tackiness and may adhere to the bottom plate 42a. In such a case, even if the purge material tray 42 is simply stopped suddenly, the purge material is not discharged from the purge material tray 42. However, when the slide member 43 comes into contact with the guide fixing member 45b in an impact manner, the purge material receiving tray 42 receives an impact when suddenly stopping. Moreover, the bottom plate 42a is made of a metal plate such as stainless steel having a smooth surface so that the purge material is easily peeled off. Therefore, in the present embodiment, even when the purge material is adhered to the bottom plate 42a, the purge material is separated from the bottom plate 42a by the impact, and the inertia is removed from the purge material receiving tray 42 which is suddenly stopped at the purge material discharge position. Emitted in the direction of travel.
[0045]
Then, the purge material discharged from the purge material tray 42 that has stopped suddenly at the purge material discharge position is collected in a purge material collection container 41 attached to the side surface of the upper platen 34. When the purge material is not adhered to the bottom plate 42a, the purge material may be released vigorously. Also in this case, since the upper edge of the side plate 41b facing the side surface of the upper platen 34 to which the purge material collection container 41 is attached is located at a position much higher than the upper surface of the upper platen 34, the side plate 41b This prevents the purge material discharged vigorously from jumping over the purge material recovery container 41.
[0046]
Subsequently, the control device drives the tray driving device to move the purge material tray 42 from the purge material discharge position to the purge material receiving position, and starts purging of the remaining molding resin again. Thereafter, the above-described operation is repeated a predetermined number of times, for example, about two or three times, and the molding resin remaining in the heating cylinder 21 is purged. The amount of the purge material discharged by one purge is such that the purge material does not overflow from the purge material tray 42, that is, the amount of the purge material is equal to or less than the purge material storage limit of the purge material tray 42. is there.
[0047]
Here, the purge material receiving tray 42 is movably disposed on the upper surface of the upper platen 34, and accommodates the purge material at a position directly below the injection nozzle 23, that is, at the purge material receiving position, so that the size is increased. The amount of purge material that can be accommodated is limited. Therefore, when the amount of the molding resin remaining in the heating cylinder 21 is large, the number of operations described above is set to be large, so that the purge material does not overflow from the purge material tray 42. Thereby, most of the molding resin remaining in the heating cylinder 21 is discharged and collected in the purge material collection container 41 as a purge material. Since the purge material recovery container 41 is attached to the side surface of the upper platen 34, the size can be increased. Therefore, the capacity of the purge material collection container 41 is assumed to be sufficiently large.
[0048]
When the molding resin is purged a predetermined number of times, the control device subsequently adjusts the power supplied to the heater 22 to raise the temperature of the heating cylinder 21 from a temperature suitable for the molding resin. Lower to a temperature suitable for the resin. Here, when the molding resin is Arlen (R), the temperature suitable for the molding resin is about 300 ° C., and the temperature suitable for the purging resin used for purging the Arlen (R) is: It is about 250 [° C].
[0049]
Subsequently, the control device operates a hopper switching device (not shown) to supply the purge resin into the heating cylinder 21 from the hopper instead of the molding resin. Then, the control device causes the same operation as the above-described operation of purging the molding resin to be repeatedly performed a predetermined number of times, for example, about two to three times, and purges the purging resin supplied to the heating cylinder 21. Let it do. Thus, the molding resin slightly remaining in the heating cylinder 21 is discharged together with the purge resin, and the molding resin is completely discharged from the heating cylinder 21. Since the temperature of the heating cylinder 21 is lowered to a temperature suitable for the resin for purging and the purging resin is purged, the inside of the heating cylinder 21 is appropriately cleaned by the resin for purging, and the remaining molding resin is removed. It can be completely discharged from the heating cylinder.
[0050]
Then, when the purging of the purging resin is completed a predetermined number of times, the control device subsequently adjusts the power supplied to the heater 22 to raise the temperature of the heating cylinder 21 to a temperature suitable for the molding resin. . Further, the control device drives the tray driving device to move the purge material tray 42 from the purge material receiving position to the purge material discharging position, that is, to retreat (move rightward in FIG. 4 or 5), and Stop at the material discharge position. Thereby, the next molded article can be molded by changing the resin for changing the molding resin. Note that different types of molding resins may be used before and after the resin change, or the same type of molding resins may be used.
[0051]
Next, the flowchart will be described.
Step S1 Press the resin exchange button.
Step S2: The purge material tray 42 is advanced.
Step S3: The temperature of the heater 22 is adjusted to lower the heating cylinder 21 to a temperature suitable for the resin for purging.
Step S4 Purge is performed.
Step S5: Adjust the temperature of the heater 22 to raise the temperature of the heating cylinder 21 to a temperature suitable for the molding resin.
Step S6: The purge material tray 42 is moved backward.
[0052]
Next, an operation of automatically performing a purge when an abnormality occurs in the injection molding machine will be described.
[0053]
FIG. 7 is a flowchart showing an operation of automatically performing a purge according to the embodiment of the present invention.
[0054]
The control device stops the operation of the injection molding machine when detecting that some abnormality has occurred in the injection molding machine while molding the molded article. The operator operates the input means of the control device in advance to set the temperature mode of the heating cylinder 21 after the purge is completed to a molding temperature mode for maintaining a temperature suitable for the molding resin, or to set the temperature mode to the temperature keeping mode. It shall be set whether or not to use the heat retaining temperature mode for maintaining an appropriate temperature.
[0055]
When the operation of the injection molding machine stops, the control device drives the injection driving device to move the injection device main body upward. Thereby, as shown in FIG. 5, the injection nozzle 23 disposed at the front end of the heating cylinder 21 reaches above the upper surface of the upper platen 34.
[0056]
Subsequently, after waiting until the injection device reaches the upper limit position, the control device drives the tray driving device to move the purge material tray 42 from the purge material discharge position to the purge material receiving position as shown in FIG. Advance to. Subsequently, purging of the remaining molding resin is started, the screw rotating device is driven to rotate the screw, and the screw driving device is driven to advance the screw. Thus, the molding resin remaining in the heating cylinder 21 is discharged from the injection nozzle 23 as a purge material.
[0057]
Note that the subsequent operation, that is, the operation of purging the molding resin and the purging resin, is the same as the operation in the case where the purging is manually performed, and thus the description thereof is omitted.
[0058]
When the purging of the purging resin is completed a predetermined number of times, the control device subsequently sets the temperature mode of the heating cylinder 21 after the purging is set to the molding temperature mode or to the heat retaining temperature mode. To determine if Here, when it is determined that the molding temperature mode is set, the control device adjusts the electric power supplied to the heater 22 to adjust the temperature of the heating cylinder 21 to a temperature suitable for the molding resin, for example, about 300 Increase to [° C]. When it is determined that the mode is set to the heat retaining temperature mode, the control device adjusts the power supplied to the heater 22 to adjust the temperature of the heating cylinder 21 to a temperature suitable for keeping the temperature, for example, about 280 ° C. To rise.
[0059]
Subsequently, the control device drives the tray driving device to retract the purge material tray 42 from the purge material receiving position to the purge material discharge position and stop the purge material tray 42 at the purge material discharge position. Thereby, molding of the next molded article can be restarted.
[0060]
Next, the flowchart will be described.
Step S11 When an abnormality occurs, the injection molding machine stops.
Step S12: Move the injection device body upward.
Step S13: Wait until the injection device reaches the vertical position.
Step S14: The purge material tray 42 is advanced.
Step S15 The temperature of the heater 22 is adjusted to automatically lower the heating cylinder 21 to a temperature suitable for the resin for purging.
Step S16 Purge is performed.
Step S17: It is determined whether the temperature mode of the heating cylinder 21 is set to the molding temperature mode or the heat retaining temperature mode. When it is set to the molding temperature mode, the process proceeds to step S19, and when it is set to the heat retaining temperature mode, the process proceeds to step S18.
Step S18: The temperature of the heater 22 is adjusted to raise the heating cylinder 21 to a temperature suitable for keeping the temperature.
Step S19: Adjust the temperature of the heater 22 to raise the temperature of the heating cylinder 21 to a temperature suitable for the molding resin.
Step S20: The purge material tray 42 is moved backward.
[0061]
As described above, in the present embodiment, the injection molding machine is configured to purge the molding resin remaining in the heating cylinder 21, change the temperature of the heating cylinder 21 to a temperature suitable for the purging resin, The supply to the pump 21 and the purging of the resin for purging are automatically performed. Therefore, the work necessary for changing the resin for changing the molding resin can be automatically performed, and the productivity of the injection molding machine can be improved, and the automatic operation of the injection molding machine can be performed. Since the temperature of the heating cylinder 21 is automatically changed to a temperature suitable for the resin for purging, the viscosity of the resin for purging does not decrease and no gas is generated. Thus, the molding resin that is appropriately cleaned and remains can be completely discharged from the heating cylinder 21.
[0062]
The purge material discharged from the heating cylinder 21 is stored in a purge material receiving tray 42 having a relatively small capacity which can move to a position directly below the injection nozzle 23, that is, a purge material receiving position. It is automatically transferred from the tray 42 to the purge material collection container 41 having a relatively large capacity and collected. In this case, since the purge material receiving tray 42 receives an impact when suddenly stopping, even if the purge material stored in the purge material receiving tray 42 adheres to the bottom plate 42a, the impact of the bottom plate 42a And is released in the traveling direction by inertia and collected in the purge material collection container 41. Therefore, the purging material can be automatically collected in the purging material collecting container 41.
[0063]
Further, even when an abnormality occurs in the injection molding machine, the purge is automatically performed, and thereafter, the temperature of the heating cylinder 21 is maintained at a temperature suitable for the molding resin or a temperature suitable for keeping the temperature, so that the abnormality is solved. After that, molding of the molded article can be restarted immediately. Therefore, even if an abnormality occurs in the injection molding machine, the throughput of the injection molding machine does not significantly decrease.
[0064]
In the above-described embodiment, the vertical injection molding machine that performs vertical clamping and vertical injection has been described. However, the resin changing device and method of the present invention is applicable to the case where the mold supporting member moves in the horizontal direction (horizontal direction). It can also be applied to a horizontal type injection molding machine. The resin changing device and method of the present invention can be applied to molding machines such as an extrusion molding machine, a laminator, a transfer molding machine, a die cast machine, and an IJ sealing press, in addition to an injection molding machine.
[0065]
In addition, the present invention is not limited to the above-described embodiment, and can be variously modified based on the gist of the present invention, and they are not excluded from the scope of the present invention.
[0066]
【The invention's effect】
As described above in detail, according to the present invention, the resin changing device includes a heating cylinder including a nozzle and a heating device, and a nozzle insertion hole that communicates a mold mounting surface and a back surface. A mold support member having a mold mounted on a surface thereof; a purge material receiving tray movably mounted on a back surface of the mold support member and moving between a purge material receiving position and a purge material discharge position; A purge material recovery container attached to a side surface of the mold supporting member corresponding to a discharge position; and a step of purging the temperature of the heating cylinder when supplying the purging resin to the heating cylinder after purging the molding resin. And a control device for changing the temperature to a temperature suitable for the resin for use.
[0067]
In this case, the work required for changing the resin for changing the molding resin can be automatically performed, and the productivity of the molding machine can be improved, and the automatic operation of the molding machine can be performed. In addition, the temperature of the heating cylinder is automatically changed to a temperature suitable for the resin for purging, so that the viscosity of the resin for purging does not decrease and gas is not generated, and the inside of the heating cylinder is appropriately controlled by the resin for purging. And the remaining molding resin can be completely discharged from the heating cylinder.
[0068]
In another resin changing apparatus, the purge material receiving tray is suddenly stopped by receiving an impact at the purge material discharge position, and discharges the purge material to be stored.
[0069]
In this case, even if the purge material accommodated in the purge material tray adheres to the purge material tray, the purge material is separated from the purge material tray by the impact, released in the traveling direction by inertia, and collected in the purge material collection container. . Therefore, the purge material can be automatically collected in the purge material collection container.
[0070]
In still another resin changing device, the control device further maintains the temperature of the heating cylinder at a temperature suitable for the molding resin or a temperature suitable for keeping the temperature after the purging of the purging resin.
[0071]
In this case, molding of the molded article can be restarted promptly, and the throughput of the molding machine does not significantly decrease.
[0072]
In the resin changing method, the purge material receiving tray is moved to the purge material receiving position to accommodate the purge material discharged from the heating cylinder, and the purge material receiving tray is moved to the purge material discharging position to collect the purge material. When the resin is transferred to a container and the resin for purging is supplied to the heating cylinder after purging the resin for molding, the temperature of the heating cylinder is changed to a temperature suitable for the resin for purging.
[0073]
In this case, the purge material can be automatically collected, and the inside of the heating cylinder is appropriately cleaned by the purge resin without lowering the viscosity of the purge resin or generating gas. The remaining molding resin can be completely discharged from the heating cylinder.
[Brief description of the drawings]
FIG. 1 is a front view of a main part of an injection molding machine according to an embodiment of the present invention.
FIG. 2 is a plan view of a purge take-out device of the injection molding machine according to the embodiment of the present invention, and is a view as viewed in the direction of arrow A in FIG.
FIG. 3 is a side sectional view of a purge take-out device of the injection molding machine according to the embodiment of the present invention, and is a view as viewed in the direction of arrow B in FIG.
FIG. 4 is a first diagram illustrating a state in which a purge material receiving tray according to the embodiment of the present invention is at a purge material receiving position.
FIG. 5 is a second diagram showing a state in which the purge material receiving tray in the embodiment of the present invention is at a purge material receiving position.
FIG. 6 is a flowchart illustrating an operation of manually performing a purge according to the embodiment of the present invention.
FIG. 7 is a flowchart illustrating an operation of automatically performing a purge according to the embodiment of the present invention.
[Explanation of symbols]
21 Heating cylinder
22 heater
23 Injection nozzle
31 Lower platen
34 Upper platen
41 Purging material collection container
42 Purge material tray

Claims (6)

(A) a heating cylinder including a nozzle and a heating device;
(B) a mold support member having a nozzle insertion hole communicating the mold mounting surface and the back surface, the mold being mounted on the mold mounting surface;
(C) a purge material receiving tray movably mounted on the back surface of the mold support member and moving between a purge material receiving position and a purge material discharging position;
(D) a purge material collection container attached to a side surface of the mold supporting member corresponding to the purge material discharge position;
(E) a controller for changing the temperature of the heating cylinder to a temperature suitable for the purging resin when supplying the purging resin to the heating cylinder after purging the molding resin. Resin changer. The resin changing device according to claim 1, wherein the purge material receiving tray is suddenly stopped by receiving an impact at the purge material discharge position, and discharges the purge material to be stored. The controller is configured to purge molding resin remaining in the heating cylinder, change the temperature of the heating cylinder to a temperature suitable for the purging resin, supply the purging resin to the heating cylinder, and supply the purging resin. The resin changing device according to claim 1 or 2, wherein the resin is automatically purged. 4. The resin changing device according to claim 3, wherein the controller keeps the temperature of the heating cylinder at a temperature suitable for the molding resin or a temperature suitable for keeping the temperature after the purging of the purging resin. 5. (A) moving the purge material receiving tray to the purge material receiving position to accommodate the purge material discharged from the heating cylinder,
(B) moving the purge material receiving tray to a purge material discharge position to transfer the purge material to a purge material collection container;
(C) A method of changing the resin, wherein the temperature of the heating cylinder is changed to a temperature suitable for the resin for purging when supplying the resin for purging to the heating cylinder after purging the resin for molding. The resin replacement method according to claim 5, wherein the purge material receiving tray is suddenly stopped by receiving an impact at the purge material discharge position, and discharges the purge material to be stored.

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