JP2007216653A - Injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly effective injection molding machine having a small volume at a low cost which has mold devices, wherein the number of the mold devices is more than that of injection devices, and the injection device injecting a molten material to the mold devices in series. <P>SOLUTION: The injection molding machine comprises the injection device 1 plasticizing a molding material and injecting the molten material, a plurality of the mold devices 3 each in contact with the injection device 1 to inject/fill the molten material, a fixing beam 6 on which a plurality of the mold devices 3 are mounted, a mold clamping device 2 housing the mold devices 3 in series to clamp them, and a trestle 7 on which the mold clamping device 2 and the injection device 1 are mounted and which moves so that the mold clamping device 2 houses the mold devices 3 in series. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an injection molding machine that includes a number of mold devices larger than the number of injection devices, and the injection devices sequentially inject molten material into the mold devices.

  As prior art in this technical field, there are Patent Literature 1 and Patent Literature 2. Patent Document 1 arranges and fixes a mold and a plurality of units having a mold closing mechanism and a mold opening mechanism in a relatively stationary state with respect to each other, and operates an injection mechanism that cooperates with each of the above units in an opposed state This injection mechanism works selectively for each unit, fills the mold of the unit with plastic raw material, closes the mold, and injects into other unit positions while it cools and solidifies The filling operation is performed by moving the apparatus. However, in this injection molding machine, all of the plurality of units must be provided with a mold clamping mechanism, and when many units are provided, the cost becomes extremely high.

  Patent Document 2 includes a mold apparatus in which a mold having a molded product cavity is formed by an upper mold and a lower mold so that the mold mold can be opened and closed by an opening / closing means; A rotary device that sequentially moves the mold device to a plurality of stations shown below by rotation of a rotary table, and the station includes a thermosetting resin injection device and a mold clamping device, and the mold clamping and the molded product cavity A mold clamping / injection station for injecting thermosetting resin into the mold, a curing station for proceeding with curing of the thermosetting resin in the molded product cavity, and demolding for opening the molded mold and releasing the molded product Station, and arranged in the rotation direction of the rotary table in the order described above. However, this injection molding apparatus does not include a mold clamping device for each station, so the cost does not increase. However, the injection apparatus must be provided outside the rotary table and occupies a large installation area.

Japanese Patent Publication No. 45-12993 JP-A-7-223235

  The present invention has been made to solve the above-described problems, and includes a number of mold devices larger than the number of injection devices, and the injection devices are highly efficient injections that sequentially inject molten material into the mold devices. An object is to provide a molding machine at a low cost and in a small volume.

  The present invention includes an injection device that plasticizes a molding raw material and injects it as a molten material, a plurality of mold devices that are in contact with the injection device to inject and fill the molten material, and a plurality of the mold devices. A fixed beam, a mold clamping device that sequentially accommodates and clamps the mold device, and the mold clamping device and the injection device are mounted so that the mold clamping device sequentially accommodates the mold device. The present invention relates to an injection molding machine having a mounting base.

  According to the injection molding machine of the present invention, the number of mold apparatuses is larger than the number of injection apparatuses, and the injection apparatus is a low-cost and small-volume injection molding machine that sequentially injects molten material into the mold apparatus. It is obtained by.

  Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of an injection molding machine according to the present invention. FIG. 2 is a side view of the AA cross section in FIG. FIG. 3 is a side view showing a moving state of the gantry when the fixed beam in FIG. 1 is viewed outward. FIG. 4 is a plan view of the injection molding machine of the present invention when the fixed beam is rectangular. In addition, the same code | symbol in each drawing represents that it is the same member or a member which has the same function and an effect | action.

  The injection device 1 includes a heating cylinder having a screw 18 inserted in a freely reciprocating manner and having a nozzle 18 on a tip surface, a driving means for rotating the screw to move forward and backward, and a heating cylinder and a driving means that are integrally mounted to move back and forth. The slide base 20 is provided on the upper surface of the slide base 20 via a fulcrum shaft 22, and the housing 21 accommodates the control device for the driving means. The injection device 1 injects and fills a molding material such as plastic, which is plasticized with a screw and a heating cylinder, into a molten material into a mold device 3 that abuts against the nozzle 18, and cools and solidifies it to obtain a molded product.

  The mold clamping device 2 includes an upper plate 14 that is a rectangular thick plate, a rectangular thick plate lower plate 15 that is opposed to the upper plate 14 by tie bars 16 that are erected at four corners, and a central portion of the lower plate 15. And a pressure-clamping means 17 such as a hydraulic cylinder. Since the side surface of the lower plate 15 is fixed to the side surface on the nozzle 18 side of the gantry 7 on which the injection device 1 is mounted, the injection device 1 and the mold clamping device 2 are mounted on the upper surface of the gantry 7 as a pair. Will be. In addition, another mold clamping device is fixed to the end surface of the gantry opposite to the end surface to which the mold clamping device 2 is fixed, and another injection device is provided on the gantry so as to face the mold clamping device. Two pairs of devices may be provided.

  In the chamber 24 which is a space surrounded by the upper plate 14, the lower plate 15 and the tie bar 16 of each mold clamping device 2, the fixed beam 6 is provided so as to be continuously penetrated. The fixed beam 6 is a beam having a flat upper surface and a planar shape that is annular, fan-shaped, or rectangular. On the upper surface of the fixed beam 6, a plurality of mold apparatuses 3 are arranged on the center line.

  The mold apparatus 3 includes a fixed mold that is fixed to the upper surface of the fixed beam 6 by allowing the protrusions below the mold apparatus 3 to pass through the perforated holes arranged on the upper longitudinal center line of the fixed beam 6, A movable mold that forms a cavity by matching the molds, and a movable mold that is spaced apart from the fixed mold, is moved closer to the fixed mold, and can be clamped with a clamping force smaller than the clamping force of the mold clamping device 2. It comprises an opening / closing means 4 such as a hydraulic cylinder, and an ejector 13 for releasing a molded product that is housed in the fixed mold from the cavity surface of the fixed mold. The mold apparatus 3 includes an on-off valve for preventing the backflow of the molten material from the cavity to the side of the sprue bush and a molten material in the confined cavity in the middle of the passage communicating from the sprue bush to the cavity. It is preferable to provide holding means for holding under pressure. Further, the pressure oil for controlling the opening / closing means 4 and the ejector 13 is supplied from a hydraulic device 5 provided in the vicinity of the mold device 3.

  The mold apparatus 3 arranged and fixed to the fixed beam 6 is sequentially accommodated in the chamber 24 of the mold clamping apparatus 2 as the gantry 7 moves. That is, the height of the mold apparatus 3 is set to be slightly smaller than the distance from the lower surface of the upper board 14 to the upper surface of the pressing means 17 protruding from the upper surface of the lower board. The width dimension is set to be sufficiently smaller than the interval between the tie bars 16 in the axial direction of the injection apparatus 1. The positional relationship between the fixed beam 6 and the gantry 7 is set so that the center of the mold apparatus 3 is the center of the chamber space 24.

  As shown in FIGS. 1 and 2, when the fixed beam 6 is annular or fan-shaped as shown in FIGS. 1 and 2, the gantry 7 is moved at the center point of the annular or arc-shaped center line of the mold apparatus 3 arranged 23. As the moving means 23 at this time, an electric motor with a reduction gear, a cylinder with a crank, or the like is preferably used. The roll guides 11 and 12 for guiding the movement of the fixed beam 6 are also annular or arcuate. Also, as shown in FIG. 4, the movement of the gantry 7 when the fixed beam 6 is rectangular is guided by linear roll guides 11 and 12 provided in parallel to the center line of the mold apparatus 3 arranged in a row. Is performed by a hydraulic cylinder or the like. Further, the gantry 7 is guided by rollers 10 and 10 attached to the upper surface of the gantry 7 with respect to the lower surface of the fixed beam 6.

  As shown in FIGS. 1 to 3, pressure receiving members 9 are provided at a plurality of longitudinal positions on the lower surface of the fixed beam 6. A hydraulic cylinder as a support means 8 is provided vertically below the pressure receiving member 9, and the rod of the hydraulic cylinder that extends to the maximum abuts and engages the pressure receiving member 9 to support the fixed beam 6. When the support means 8 is most contracted, the lower board 15 (the gantry 7) can easily pass through the gap between the pressure receiving member 9 and the support means 8 as shown in FIG. In this way, the movement of the gantry 7 is executed without interfering with the mold apparatus 3 by maximally reducing only the support means 8 in the vicinity of the mold apparatus 3 forward in the movement direction. When the fixed beam 25 is rectangular as shown in FIG. 4 or when the fixed beam 25 has a short fan shape, the longitudinal end surfaces thereof are fixed to the support columns 26 and 26 and supported below the fixed beam 25. There may be no member so that the lower plate 15 (the gantry 7) can pass under the fixed beam 25 without the support means 8.

  Next, the operation of the injection molding machine of the present invention will be described in detail with reference to FIG. First, in order to attach the mold apparatus 3 to the fixed beam 25, the mold apparatus 3 mounted on the mold transport carriage 27 that moves outside the fixed beam 25 in parallel with the fixed beam 25 is fixed to the fixed beam 25. Transfer to the mold mounting position and transfer. After the six or fewer mold apparatuses 3 are attached to the fixed beam 25 by this procedure, the gantry 7 is moved to the arbitrarily determined mold apparatus 3. The first mold apparatus 3 is clamped by the mold clamping apparatus 2 and an injection process is performed in which the molten material is injected from the injection apparatus 1 and filled into the cavity. At this time, the pulling means 19 of the injection apparatus 1 engages with the tie bar 16 of the mold clamping apparatus 2 and pulls the injection apparatus 1 toward the mold clamping apparatus 2, so that the nozzle 18 presses the fixed mold and / or the movable mold. Thus, leakage of the molten material is prevented. Further, the injection device 1 is configured to swing around the fulcrum shaft 22 in order to cope with the contact position of the nozzle 18 changing up and down as the mold device 3 is pressed.

  After the injection process to the first mold apparatus 3 is completed, the injection apparatus 1 starts the plasticizing process of the molding material. During or after the process, the gantry 7 moves to the second mold apparatus 3 adjacent to the first mold apparatus 3, and the first mold apparatus 3 with respect to the second mold apparatus 3. The injection process similar to that at the time is performed. Thereafter, similarly, the gantry 7 sequentially moves to the sixth mold apparatus 3, and the injection apparatus 1 sequentially repeats the plasticizing process and the injection process. Meanwhile, the mold apparatus 3 cools and solidifies the filled molten material while holding the pressure by the opening / closing means 4 or the like. After the cooling process is completed, the mold unit 3 is separated from the fixed mold by the opening / closing means 4, and the solidified molded product protrudes from the ejector 13 and is released. A take-out robot 28 that moves outward of the mold transfer carriage 27 in parallel with the fixed beam 25 moves close to the mold apparatus 3 to take out the released molded product, and the mold transfer carriage 27 moves. It is transferred onto a conveyor 29 provided on the route. Thereafter, in the mold apparatus 3, the movable mold is matched with the fixed mold by the opening / closing means 4, the gantry 7 is moved and accommodated in the mold clamping apparatus 2, and the injection process is executed again. The re-injection process is not necessarily performed in the order of the first injection process, but is performed on the mold apparatus 3 whose cooling process has been completed earlier according to the cavity shape of the mold apparatus 3. In this way, the injection molding machine of the present invention can share a single injection device for a plurality of mold devices, and can perform highly efficient molding. In addition, since a single mold clamping device and an injection device are shared by a plurality of mold devices, a low-cost injection molding machine can be obtained, and a normal injection molding machine corresponding to the number of a plurality of mold devices can be used. The installation area can be reduced as compared to installing the number.

  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.

FIG. 1 is a plan view of an injection molding machine according to the present invention. It is a side view of the AA cross section in FIG. It is a side view which shows the movement state of the mount which looked at the fixed beam in FIG. 1 outward. It is a top view of the injection molding machine of this invention when a fixed beam is a rectangle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Injection apparatus 2 Clamping apparatus 3 Mold apparatus 4 Opening / closing means 5 Hydraulic apparatus 6,25 Fixed beam 7 Mounting base 8 Support means 9 Pressure receiving member 10 Roller 11, 12 Roll guide
DESCRIPTION OF SYMBOLS 13 Ejector 14 Upper board 15 Lower board 16 Tie bar 17 Clamping means 18 Nozzle 19 Pulling means 20 Slide base 21 Case 22 Supporting shaft 23 Moving means 24 Chamber 26 Support pillar 27 Mold conveyance carriage 28 Takeout robot 29 Conveyor

Claims (3)

  An injection device for plasticizing a molding raw material and injecting it as a molten material, a plurality of mold devices in which the injection device abuts and injecting and filling the molten material, a fixed beam for mounting a plurality of the mold devices, A mold clamping device that sequentially accommodates and clamps the mold apparatus; and a platform on which the mold clamping apparatus and the injection apparatus are mounted and moved so that the mold clamping apparatus sequentially accommodates the mold apparatus. An injection molding machine comprising:   2. The injection molding machine according to claim 1, wherein the fixed beam is supported by a plurality of contact means that allow passage of the mount on the lower surface thereof.   The injection molding machine according to claim 1, wherein the fixed beams are held at both longitudinal ends by support columns.

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