JP4748802B2 - Molding machine - Google Patents

Description

  The present invention relates to a vertical main mold clamping device having a pressure clamping unit that clamps one of a plurality of sub mold clamping devices that are carried in and out from an opening that opens at right angles, and a standby outside the opening. A plurality of the sub mold clamping devices that are arranged and that can clamp the mold with a clamping force lower than the clamping force of the main mold clamping device and can open the mold, and the sub mold clamping device waits. The present invention relates to a molding machine including a conveying device that conveys the auxiliary mold clamping device between the outside of the opening and the pressure clamping portion of the main mold clamping device.

  Patent Document 1 and Patent Document 2 disclose a molding apparatus that efficiently carries in and out a plurality of sub mold clamping apparatuses in and out of the main mold clamping apparatus. Patent Document 1 discloses that a pair of sub mold clamping mechanisms provided with upper and lower mold opening / closing means, a machine base on which the sub mold clamping mechanisms are mounted so as to be movable in the lateral direction, and the sub mold clamping mechanism are both stopped positions. A vertical main mold clamping mechanism disposed in the center of the machine base, and a drive means on the machine base side that alternately moves the sub mold clamping mechanisms into and out of the main mold clamping mechanism by moving both sub mold clamping devices simultaneously. The main mold clamping mechanism consists of an upper pressure plate above the machine base and a lower pressure plate in the machine base. The present invention relates to an alternating injection molding machine characterized in that it is integrally connected by a tie bar fixed to a lower plate, a clamping ram is provided on the lower pressure receiving plate, and an injection device is provided downward on the upper pressure receiving plate. However, according to the technique of Patent Document 1, two sub-clamping mechanisms are provided, and three or more sub-clamping mechanisms are not provided in order to further increase molding efficiency. Therefore, the movement of the sub mold clamping mechanism is only a straight line that is not orthogonal, and a ball screw is adopted as the driving means.

  Patent Document 2 discloses a vertical main mold clamping device having a pressure clamping unit that clamps one of a plurality of sub mold clamping devices that are carried in and out from an opening that opens orthogonally, and an outer side of the opening. Disclosed is an injection molding machine provided with a plurality of sub-clamping devices that are placed on standby and arranged to clamp a mold with a clamping force lower than the clamping force of the main mold clamping device and to open the mold. However, there is no disclosure regarding a conveying device that conveys the sub mold clamping device between the outside of the opening that the sub mold clamping device stands by and the pressure clamping portion of the main mold clamping device.

Japanese Patent Publication No. 8-5089 US Patent Publication US2006 / 0172039A1

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a molding apparatus that can efficiently transport a sub-clamping apparatus and perform a molding operation with high efficiency.

The present invention relates to a vertical main mold clamping device having a pressure clamping unit that clamps one of a plurality of sub mold clamping devices that are carried in and out from an opening that opens at right angles, and a standby outside the opening. A plurality of the sub mold clamping devices that are arranged and that can clamp the mold with a clamping force lower than the clamping force of the main mold clamping device and can open the mold, and the sub mold clamping device waits. In a molding machine comprising a transport device that transports a sub mold clamping device that is closed between the outside of the opening and the pressure clamping portion of the main mold clamping device, the transport device is the sub mold A conveying table on which the fastening device is placed, a plurality of rails fixed to the lower surface of the conveying table, a plurality of conveying rollers that abut against the rail and rotate while being guided, and the plurality of conveying rollers on the upper surface of the gantry consists of a support frame for rotatably supporting the auxiliary clamping device which is placed on the conveying platform of the transport apparatus, the lifting movement Attach the upper die to the lower surface And upper die plate and the lower die plate attached to the lower die is provided placed on the upper surface to the transfer table, and the sub-cylinder device between the upper mold plate and the lower die plate, the inner hole of the guide tube The present invention relates to a molding machine characterized in that a rod is provided for guiding the raising and lowering of the upper mold plate.

According to the molding machine of the present invention, the auxiliary mold clamping device can be effectively conveyed, and the molding operation can be performed with high efficiency.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing the entire injection molding machine of the present invention. FIG. 2 is a front view showing a main mold clamping apparatus for clamping the sub mold clamping apparatus and an injection apparatus provided thereon. FIG. 3 is a cross-sectional plan view taken along the line AA in FIG. 4 is a cross-sectional side view taken along the line B-B in FIG. 3. FIG. 5 is a partial cross-sectional front view taken along the line CC in FIG. 6 is a sectional side view taken along the line DD in FIG. FIG. 7 is a front view including purge material discharging means when the injection device swings in FIG. 2 and the sub mold clamping device is carried out.

  As shown in FIGS. 1 to 5, the injection molding machine 1 includes an injection device 2, a drive device 3 that hydraulically drives the injection device 2, a main mold clamping device 10 disposed below the injection device 2, A base 44 provided on the outer side adjacent to the opening that is orthogonal to the horizontal direction of the main mold clamping device 10, and a pressure clamping unit and the base 44 surrounded by the opening inside the main mold clamping device 10. A conveying device 35 for conveying the sub mold clamping device 7 between them, a drive device 9 for hydraulically driving the main mold clamping device 10 and the second sub mold clamping device 7, and a drive for hydraulically driving the second sub mold clamping device 7. The scaffold 8 is provided around the injection device 2 for material supply, maintenance, inspection, etc. to the injection device 2, and a fence 4 for preventing fall is provided on the outer periphery of the scaffold 5. A ladder 6 for raising and lowering is connected to the scaffold base 5.

  As shown in FIG. 2, the main mold clamping device 10 includes a lower plate 26 that also serves as a gantry, a main cylinder 27 that is provided at the center of the lower plate 26, and a ram that is removably fitted into the main cylinder 27. 25, a vertical mold clamping device including four tie bars 24 erected at the four corners of the lower board 26, and an upper board 23 that fixes the upper ends of the tie bars 24 at the four corners. Openings are formed by the inner side surfaces of the two adjacent tie bars 24, the upper surface of the lower plate 26, and the lower surface of the upper plate 23, and the openings formed on four sides are orthogonal to each other. Further, the pressing portion is formed in a region surrounded by the four openings, the upper surface of the lower plate 26, and the lower surface of the upper plate 23. When the sub mold clamping device 7 is carried into and out of the pressure clamping portion, and the sub mold clamping device 7 is positioned at a predetermined position of the pressure clamping portion, the ram 25 rises and presses the lower mold plate 34, and the upper mold The upper mold 28 attached to the lower surface of the plate 31 and the lower mold 29 attached to the upper surface of the lower mold plate 34 are clamped together. As shown in FIG. 3, at the end of the ram 25, a position detector 60 for detecting the position of the ram 25, a limit switch 61 for detecting an overrun of the ram 25, and the rotation of the ram 25 are prevented. A rotation stopper 62 is provided.

  As shown in FIGS. 2 and 5, the sub mold clamping device 7 includes a lower mold plate 34 placed on the conveyance table 36 of the conveyance device 35, and four corners of the conveyance table 36 erected on the four corners of the lower mold plate 34. A guide cylinder 32 that is slidably inserted into an engagement hole 46 pierced in the shaft, a rod 72 that is guided by an inner hole of the guide cylinder 32, and an upper mold plate that fixes the upper ends of the plurality of rods 72 to each other. 31 and a sub-cylinder device 33 provided so as to connect two projecting portions provided symmetrically with respect to each of the upper mold plate 31 and the lower mold plate 34. The total pressing output of the second sub cylinder device 33 is configured to be smaller than the pressing output of one ram 25 of the main mold clamping device 10. A central hole 73 that opens at the lower end surface of the rod 72 and communicates with a vent hole 74 attached to the upper side surface of the rod 72 is perforated at the center of the rod 72, and sucks and exhausts air as the rod 72 moves. Making it easy. When the sub-cylinder device 33 is driven upward, the rod 75 extends and the upper mold plate 31 rises, and the closed state shown in the cross section on the right side of FIG. 5 is changed to the open state shown on the left side. At this time, the annular groove 80 provided in at least one intermediate portion of the plurality of rods 72 that guide the raising and lowering of the upper mold plate 31 is exposed, and the claw of the locking device 76 engages with the annular groove 80 and moves upward. The fall of the template 31 is prevented. The locking device 76 is an air cylinder that opens and closes the pawl at an arbitrary time, and constitutes a safety device together with the annular groove. Further, the locking pin 41 provided on the lower mold plate 34 has the sub mold clamping device 7 positioned at a predetermined position of the gantry 44, and an ejector device 47 provided at the lower part of the gantry 44 passes through the through hole 40. When the molded product is pushed up, the lower mold plate 34 is locked to the transport table 36 so that the lower mold plate 34 is not pushed up.

  The conveying device 35 conveys the auxiliary mold clamping device 7 between the outside of the opening where it waits and the pressure clamping unit in the main mold clamping device 10. As shown in FIGS. 3 to 6, the conveying device 35 is disposed adjacent to the four sides of the lower plate 26 at the same height as the upper surface of the lower plate 26 that also serves as a frame for the main mold clamping device 10. A support frame 39 having a U-shaped cross-section straddling the top surface of the gantry 44, a plurality of transport rollers 38 that are axially supported on the opposite sides of the support frame 39 so as to protrude from the end surfaces thereof, and the transport rollers 38 The rail 37 abuts with substantially the same size as the width of the rail, the rail 37 is fixed to the lower surface of the leg portion, and the engagement hole 46 for inserting the guide cylinder 32 of the auxiliary mold clamping device 7 is inserted into the four corners. The ram 25 of the fastening device 10 includes a transport table 36 having a through hole 40 through which the ram 25 penetrates. In addition, although the rail 37 showed the embodiment comprised from the conveyance stand 36 in order to make the width | variety substantially the same with the width | variety of the conveyance roller 38, and to consider the material, a part of conveyance stand 36 was shown. Alternatively, the rail 37 may be integrated with the carriage 36.

  The conveying device 35 is orthogonal to the upper surface of the lower board 26 as shown in FIG. As shown in FIG. 4, in the orthogonal portion of the transport device 35, the width direction of the transport roller supported by the support frame 39 orthogonal to the center interval R between the transport rollers supported by the support frame 39 is included. It is arranged like this. By configuring in this way, it is possible to smoothly execute the conveyance of the conveyance table 36 in one direction and the conveyance of the conveyance table 36 in the other direction orthogonal to the one direction without interfering with each other and riding on. As shown in FIGS. 3 and 4, the support frame 39 on the upper surface of the lower plate 26 serving as a pressing portion is disposed so as to surround the ram 25 in a rectangular shape. In this case, the communication part between the support frames 39 is formed to be discontinuous by providing a gap G smaller than the center distance R between the conveying rollers 38 between the end faces of the support frame 39. The gap G may be provided in a portion where the support frame 39 is orthogonal. With this configuration, the electric wire 63 to the position detector 60, the limit switch 61, and the like provided in the ram 25 can be easily wired.

  The transport driving means 48 of the transport device 35 includes a pump 65 that is driven at a variable speed by a servo motor 64, a cylinder device 67 that is driven back and forth by pressure oil generated by the pump 65 discharging hydraulic oil from the tank 66, and a transport It comprises a position detector 49 for detecting the position of the table 36. The servo motor 64, the pump 65, and the tank 66 are integrated in a compact manner and are united and fixed to the gantry 44. Two pipe lines from the pump 65 are respectively connected to cylinders of a cylinder device 67 fixed to the gantry 44. A control device (not shown) of the transport driving means 48 drives the servo motor 64 to rotate at a predetermined forward / reverse rotation speed in accordance with the target signal, and moves the rod of the cylinder device 67 forward and backward. Since the rod is connected to the transport table 36 via a joint 68, and the position of the transport table 36 is input to the control device by the position detector 49, the transport table 36 is closed at an accurate speed according to the target signal. Positioning is controlled by. The conveyance driving means 48 configured in this manner is lower in cost than that constituted by a servo motor and a ball screw, and does not require an impact buffering device or the like, and is capable of high-speed conveyance while minimizing impact during acceleration / deceleration. Is possible.

  The transport movement of the transport table 36 is guided by the rail 37 and the transport roller 38 as described above, but the horizontal guide is a plurality of guides rotating in contact with both side surfaces of the transport table 36. This is done by disposing the support plate 50 that supports the roller 51 in parallel with the support frame 39 on the upper surface of each gantry 44. The one support plate 50 is finely moved by the adjustment tool 52 in a direction orthogonal to the transport direction so that an optimum guide state is obtained. The horizontal guide of the transport table 36 in the vicinity of the four corners of the upper surface of the lower board 26 adjacent to the gantry 44 is a right-angled L-shaped support that pivotally supports a plurality of guide rollers 54 that rotate in contact with both side surfaces of the transport table 36. This is done by arranging the plate 53 in parallel with the support frame 39 at the four corners of the upper surface of the lower board 26. Further, the horizontal guide of the transport table 36 at the center of the upper surface of the lower plate 26 is provided by supporting plates 55 and 58 that pivotally support a plurality of guide rollers 56 and 59 rotating in contact with both side surfaces of the transport table 36. 26 is arranged in parallel with the support frame 39 at the center of the upper surface. Then, one of the support plates 55 and 58 is finely moved by the adjustment tool 57 in a direction orthogonal to the transport direction so that an optimum guide state is obtained. The conveyance movement of the conveyance table 36 is a standby position and the main mold clamping device at a predetermined position where the outer end surface of the conveyance table 36 abuts against the stop portions 43 and 78, where the ejector device 47 can operate, and the pressure clamping unit. 10 is reciprocating between a predetermined position at which the joint 68 is capable of pressing the sub mold clamping device 7 and the joint 68 abuts against the stop portions 42 and 77. With this configuration, even if the transport driving means 48 is not provided at the center in the direction orthogonal to the transport direction of the transport table 36 as shown in FIG. Can be driven.

  The injection device 2 includes a base body 21 erected on the upper surface of the upper plate 23 of the main mold clamping device 10, a plurality of rods 19 that are slidably guided by the base body 21, and a plan view roll that secures the upper end of the rod 19. A character-shaped base 16, a turning shaft 17 penetrating through the opposite side surface of the base 16, a connecting body 14 swingably supported by the turning shaft 17, and a lower surface of the connecting body 14 concentric with its vertical axis A heating cylinder 18 that is erected on and inserted into a screw (not shown), a nozzle 20 that is screwed at the tip of the heating cylinder 18, and a screw that is provided on the connecting body 14 and is inserted into the heating cylinder 18 is driven forward and backward. Screw driving means 13 comprising a combination of a hydraulic cylinder device or servo motor and a ball screw, screw rotating means 11 comprising a hydraulic or electric motor connected to the screw driving means 13 and the screw, a base 16 and a base 21 Between The lifting means 22 comprising a cylinder device for vignetting elevation driving the foundation 16 and a rocking means 15 which consists of a cylinder device for driving oscillating connecting member 14 provided between the connecting body 14 and base 16. In such an injection device 2, when the swinging means 15 is operated so that the heating cylinder 18 is substantially vertical and the nozzle 20 can come into contact with the upper mold 28, the material introduced into the hopper 12 is transferred into the heating cylinder 18. The plastic material is melted by plastic rotation based on the screw rotation by the screw rotating means 11, the molten material is stored below the screw in the heating cylinder 18, the nozzle 20 is pressed against the upper mold 28, and then the screw is advanced by the screw driving means 13 ( (Lower) By driving, the molten material is injected into a cavity formed by the upper mold 28 and the lower mold 29, which are clamped and matched, and filled.

  When injection molding is performed using the injection device 2, it is frequently necessary to change the material to a different color or material. In that case, as shown in FIG. 7, the raising / lowering means 22 is driven upward to separate the nozzle 20 further upward from the upper surface of the upper panel 23, and then the tray 45 of the purge material discharging means 70 is moved to the nozzle 20. Operate so that it is positioned below. Then, the previous molding material remaining in the heating cylinder 18 is discharged from the nozzle 20 by various combinations of the screw rotating means 11 and the screw driving means 13 and stored in the receiving tray 45.

  The purge material discharging means 70 includes a rectangular frame-shaped frame 30 and a rectangular shape in which the sides sliding on both long side opposing portions of the frame 30 are shorter than the length of the long side of the frame 30, and the edge at the end. And a discharge driving means comprising two receiving cylinders and the like provided between the both ends of the receiving tray 45 near the frame 30 and the both ends of the short side of the frame 30. 79 and a pin that is inserted into the insertion hole provided in the tray 45 and the frame body 30 so that the tray 45 does not move at that position when the tray 45 moves the tray 45 to the side of the drain driver 79. The lock pin 69 is inserted and removed by the apparatus. The frame 30 has a short side to which the discharge driving means 79 is not connected is connected to the upper surface of the upper board 23, and a short side to which the discharge driving means 79 is connected is connected to the scaffold base 5. The purge material discharge means 70 is disposed at a position where the molten material falls from the nozzle 20 to the central portion of the tray 45 when the discharge drive means 79 is extended. The tray 45 in which the purge material of the molten material is deposited and accommodated is moved to the scaffold base 5 by the operation of the discharge driving means 79 in a state where the locking of the locking pin 69 is released. In this way, the purge material discharge means 70 discharges the purge material that is difficult for the operator standing on the scaffolding platform 5 to take out, which contributes to the efficiency of the molding operation. Note that the tray 45 is always moved to the scaffold base 5 side and fixed by the locking pin 69 during normal molding without performing the purge material discharge operation. As a result, the nozzle 20 can come into contact with the upper mold 28.

  By the way, even if the purging operation is performed, the material attached and remaining on a screw or the like having a complicated uneven portion may be mixed into a new material in the subsequent molding and cause molding defects. Further, since there is a need for maintenance, inspection, and replacement of the screw and the heating cylinder 18, the screw and the heating cylinder 18 must be configured so that they can be easily taken out. Therefore, the injection device 2 can swing as shown in FIG. At this time, the extension shaft of the axis of the heating cylinder 18 passes through the window portion 71 formed by moving the tray 45 of the purge material discharge means 70 to the upper plate 23 side of the frame body 30 by the discharge drive means 79. Therefore, the screw can be extracted very easily from the heating cylinder 18 from which the nozzle 20 is removed.

  Next, the molding operation of the injection molding machine 1 of the present invention will be described. The sub mold clamping device 7 is waiting for positioning on each of the four mounts 44. Each sub mold clamping device 7 is configured such that the upper die 28 and the lower die 29 are pressed by the sub cylinder device 33 or the upper die 28 and the lower die 29 are separated and opened by the sub cylinder device 33. It is opened, the ejector device 47 is operated to eject a molded product, the molded product is taken out from the lower mold 29, or the upper mold 28 and the lower mold 29 without the molded product are connected by the sub cylinder device 33. Either the mold is closed. Of these sub-clamping devices 7, the sub-clamping device 7 in which the upper mold 28 and the lower mold 29 having no molded product are closed by the sub-cylinder device 33 is transferred by the transport driving means 48 and the transport device 35. It is conveyed through the opening of the main mold clamping device 10 to a predetermined position of the pressure clamping unit. Pressure oil is supplied to the main cylinder 27 to raise the ram 25. The ram 25 loosely penetrates the through hole 40 of the transport table 36 and comes into contact with the lower surface of the lower mold plate 34, and the sub mold clamping device 7 is separated from the transport table 36 and further pressed to perform the upper mold 28 and the lower mold. 29 is pressed. The raising / lowering means 22 is operated to press the nozzle 20 against the upper mold 28 and the screw driving means 13 is driven forward to inject the molten material into the mold cavity with the screw. While the upper mold 28 and the lower mold 29 are being clamped by the sub cylinder device 33, the sub mold clamping device 7 is transported to the standby position of the original gantry 44 by the transport driving means 48 and the transport device 35. At that time, another sub-clamping device 7 that is closing the upper mold 28 and the lower mold 29 without a molded product by the sub-cylinder device 33 is conveyed to the main mold clamping device 10 in the same process as described above. Perform molding. On the other hand, in the sub mold clamping device 7 that has returned to the stand-by position of the gantry 44, the upper mold 28 and the lower mold 29 are clamped by the sub cylinder device 33 to hold or cool the molded product, and the sub cylinder device 33 The upper mold 28 and the lower mold 29 are separated and opened, the mold is opened, the molded product is ejected by the ejector device 47, the molded product is taken out from the lower mold 29, and the molding cycle in the sub mold clamping device 7 is completed. To do. Such a molding cycle is performed for each sub mold clamping device 7.

  The present invention is not limited to the embodiments described above, and various modifications can be added and implemented without departing from the spirit of the invention. For example, in the above embodiment, the injection molding machine including the injection device has been described. However, the injection molder is not provided, but the main mold clamping device and the plurality of sub mold clamping devices are provided, and the molten material is provided on the cavity surface of the lower mold. It is also possible to implement the present invention in a molding machine that supplies a plate-like material and performs compression molding or shaping. Further, although the sub mold clamping device has been described in the embodiment arranged in a cross shape, the sub mold clamping device may be arranged in a T shape, or any one of the sub mold clamping devices may be arranged in series. It may be arranged.

It is a front view which shows the whole injection molding machine of this invention. It is a front view which shows the main mold clamping apparatus which clamps a sub mold clamping apparatus, and the injection apparatus provided on it. FIG. 2 is a cross-sectional plan view taken along the line AA in a state where no sub mold clamping device exists in FIG. 1. It is a BB arrow cross-sectional side view in FIG. FIG. 4 is a partial cross-sectional front view taken along the line CC in FIG. 3. FIG. 4 is a cross-sectional side view taken along the line DD in FIG. 3. FIG. 3 is a front view including purge material discharging means when the injection device swings in FIG. 2 and the sub mold clamping device is carried out.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Injection molding machine 2 Injection apparatus 3,8,9 Drive apparatus 4 Fence 5 Scaffold stand 6 Ladder 7 Sub mold clamping apparatus 10 Main mold clamping apparatus 11 Screw rotation means 12 Hopper 13 Screw drive means 14 Connection body 15 Oscillation means 16 Base DESCRIPTION OF SYMBOLS 17 Rotating shaft 18 Heating cylinder 19, 72, 75 Rod 20 Nozzle 21 Base body 22 Lifting means 23 Upper panel 24 Tie bar 25 Ram 26 Lower panel 27 Main cylinder 28 Upper mold 29 Lower mold 30 Frame 31 Upper mold plate 32 Guide cylinder 33 Sub-cylinder 34 Lower mold plate 35 Conveying device 36 Conveying table 37 Rail 38 Conveying roller 39 Support frame 40 Through hole 41, 69 Locking pin 42, 43, 77, 78 Stopping portion 44 Base 45 Receiving plate 46 Engaging hole 47 Ejector Device 48 Transport driving means 49, 60 Position detector 50, 53, 55, 58 Support plate 51, 54, 56, 5 9 Guide rollers 52 and 57 Adjuster 61 Limit switch 62 Stopper 63 Electric wire 64 Servo motor 65 Pump 66 Tank 67 Cylinder device 68 Joint 70 Purge material discharging means 71 Window portion 73 Center hole 74 Venting port 76 Locking device 79 Discharge drive Means 80 Annular groove G Gap R Center gap

Claims (3)

A vertical main mold clamping device having a pressure clamping portion that clamps one of a plurality of sub mold clamping devices carried in and out from an opening opening orthogonally, and is placed on standby outside the opening. A plurality of the sub-clamping devices capable of pressing the mold with a clamping force lower than the clamping force of the main mold-clamping device and opening the mold, and the outside of the opening where the sub-clamping device waits A molding machine including a conveying device that conveys a sub-clamping device that is closed between the one side and the pressure-clamping portion of the main clamping device;
The conveying device includes a conveying table on which the sub-clamping device is placed, a plurality of rails fixed to the lower surface of the conveying table, a plurality of conveying rollers that abut against the rail, rotate, and rotate. It consists of a support frame that pivotally supports a plurality of transport rollers on the top of the gantry,
The sub mold clamping device mounted on the transport table of the transport device includes an upper mold plate that moves up and down and has an upper mold mounted on the lower surface, and a lower mold plate that is mounted on the transport table and has a lower mold mounted on the upper surface. And a rod for guiding the raising and lowering of the upper mold plate guided by the inner hole of the guide cylinder is provided between the upper mold plate and the lower mold plate.   2. The molding machine according to claim 1, wherein the transport table has a through hole penetrating the ram of the main mold clamping device.   The conveyance drive means of the said conveyance apparatus is equipped with the pump driven by variable speed with a servomotor, the cylinder apparatus which advances / retreats by the pressure oil of this pump, and the position detector which detects the position of the said conveyance stand. The molding machine described in 1.

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