JP4178184B2 - Molding device for injection molding machine - Google Patents

Description

  The present invention relates to a mold clamping device of an injection molding machine that prevents a stationary platen from falling against a machine body when a nozzle is touched.

Conventionally, as a mold clamping device of this type of injection molding machine, a pair of operating shafts of a nozzle driving device that moves a nozzle of a heating cylinder of an injection device forward and backward relative to a stationary plate with a lower end fixed to a machine body. The front end of the fixed plate is located at the height of the center of the fixed plate (the center of the nozzle or the center of the injection shaft) and is symmetrically arranged on both sides of the fixed plate to connect to the fixed plate. It is known that the bending moment in both directions of the acting injection axis is canceled, thereby preventing the stationary platen from falling against the machine body due to the nozzle pressing force (for example, Patent Documents) 1).
Also, at the bottom of the surface of the fixed platen on the nozzle touch side, a rib is integrally provided on the fixed plate so as to surround the opening through which the nozzle is inserted, and the machine body to which the rib is attached is reinforced with a support column. There is also known one that prevents the fixed plate from falling against the machine body due to a nozzle pressing force (see, for example, Patent Document 2).
Furthermore, both sides of the fixed plate are parallel to the mold mounting surface of the fixed plate through a pair of support legs fixed to the machine body, passing through the center of the fixed plate (the center of the nozzle of the heating cylinder or the center of the injection shaft). A horizontal support shaft is rotatably supported around the support shaft, and a nozzle pressing force acting on the fixed platen is received by the support shaft so that a falling moment in the injection axis direction with respect to the fixed platen is prevented. Therefore, it is also known that the fixed platen is prevented from falling with respect to the machine body due to the nozzle pressing force (see, for example, Patent Document 3).
JP-A-9-277306 JP 2000-289069 A JP 2001-239561 A

However, in the mold clamping device of the injection molding machine described in Patent Document 1, a rod-shaped operating shaft is arranged in parallel with the heating cylinder from the injection apparatus toward the stationary platen, There is a problem that workability at the time of maintenance work or resin purging work is deteriorated, and when trying to turn the injection device for replacement work of the heating cylinder, the connection between the operating shaft and the fixed platen There is also a problem that it is necessary to cancel the heating cylinder, and that the heating cylinder cannot be replaced efficiently. Furthermore, the structure of the injection device becomes complicated, and it is not possible to easily modify an existing injection device and attach a drive device for nozzle touch.
Further, in the mold clamping device of the injection molding machine described in Patent Document 2, the workability does not deteriorate as in the mold clamping device of the injection molding machine described in Patent Document 1, but the machine body and the stationary platen As a result, there is a problem that their mass increases to increase the strength of the machine, and the entire machine becomes heavy. Moreover, it does not eliminate the cause of the falling of the fixed platen, and an effect of reducing the falling is recognized, but the falling of the fixed platen cannot be fundamentally solved.
Further, in the mold clamping device of the injection molding machine described in Patent Document 3, the stationary platen can be effectively prevented from falling down, but the stationary platen is supported by the support legs so as to be rotatable around the support shaft. As a result, the support rigidity of the fixed platen with respect to the machine body may be reduced.

  The present invention has been made in view of the above circumstances, and with a relatively simple structure, the stationary platen can be reliably prevented from falling down at the time of nozzle touch, and the workability can be reduced and the mechanical mass can be increased. It is an object of the present invention to provide a mold clamping device for an injection molding machine that can be suppressed.

In order to solve the above-mentioned problems, the present invention is characterized by the following configuration.
In other words, a mold clamping device for an injection molding machine according to claim 1 is provided with a fixed plate standing on a machine body and a movable plate arranged to face the fixed plate, and the fixed plate includes a plurality of tie bars. The movable platen is moved forward and backward with respect to the fixed platen by the movable platen drive mechanism connected by the die, and the mold is opened and closed between the fixed die attached to the fixed platen and the movable die attached to the movable platen, In a mold clamping device of an injection molding machine that performs clamping, a stationary mold mounting portion for mounting a stationary mold in which the stationary plate is supported so that a lower end portion thereof is movable only in a mold opening / closing direction on the machine body; And a support member that is fixedly supported on the machine body on the side opposite to the mold mounting surface of the fixed mold mounting portion and can be deformed so as to fall down on the movable platen side .

  The mold clamping device of an injection molding machine according to claim 2 is the mold clamping device according to claim 1, wherein the fixed mold mounting portion is a connecting plate portion having the tie bars mounted at four corners as an anti-mold. It is provided on the mounting surface side, is provided so as to be able to contact and be separated from the mold mounting side surface of the connecting plate portion, and the support member is provided integrally with the connecting plate portion.

The present invention has the following excellent effects.
That is, according to the mold clamping device of the injection molding machine according to claim 1, the fixed mold mounting portion of the fixed plate is fixedly supported on the machine body by the support member on the side opposite to the mold mounting surface, and the nozzle drive Since the device is not connected to the fixed mold mounting portion, regardless of the arrangement of the nozzle drive device, and hardly affected by the deformation of the support member, it only moves slightly to the movable platen side. It is possible to reliably prevent the movable platen from falling down due to the pressing force of the injection nozzle during the nozzle touch operation. Therefore, the arrangement of the nozzle drive device becomes free, the arrangement around the heating cylinder becomes unnecessary, and the workability around the heating cylinder such as maintenance work, resin purging work and heating pipe replacement work can be improved. it can. Further, since it is not necessary to increase the strength of the machine body or the fixed platen, the structure is relatively simple, and an increase in the mass of the entire machine can be suppressed.

  According to the mold clamping device of the injection molding machine according to claim 2, since the supporting member supports the tension acting on the tie bar during the mold clamping via the connecting plate portion, the fixed mold mounting portion is deformed by the tension. Can be surely suppressed.

Hereinafter, a mold clamping device of an injection molding machine according to a first embodiment of the present invention will be described with reference to the accompanying drawings.
1 and 2, reference numeral 1 denotes a mold clamping device of an injection molding machine (horizontal injection molding machine) according to a first embodiment of the present invention. The mold clamping device 1 includes a stationary platen 3 erected on a machine body 2 and a movable platen supported by four tie bars 4 that are arranged opposite to the stationary platen 3 and are attached to four corners of the stationary platen 3. 5 is provided. An end plate (not shown) is connected to the end of the tie bar 4 opposite to the fixed plate 3, one end is connected to the tie bar via the end plate, and the other end is connected to the movable plate 5. The movable platen 5 is moved forward and backward with respect to the fixed platen 3 by a movable plate driving mechanism (not shown), and a fixed mold K 1 attached to the fixed platen 3 and a movable side die attached to the movable platen 5. Mold opening / closing and mold clamping with the mold K2 are performed.

The fixed platen 3 has a fixed mold mounting part 6 for mounting a fixed mold K1 whose lower end is supported on the machine body 2 so as to be movable only in the axial direction of the tie bar 4 (mold opening / closing direction). And a support member 7 for fixing and supporting the anti-mold mounting surface 6a side of the fixed mold mounting portion 6 on the machine body 2.
That is, a pair of linear guides 8 and 8 incorporating rolling elements such as steel balls and rollers are fixed by bolts or the like at the lower portions on both sides in the width direction (left and right direction in FIG. 2) of the fixed mold mounting portion 6. The linear guides 8 and 8 are supported by a pair of guide rails 9 and 9 fixed along the axial direction of the tie bar 4 with a space parallel to the upper surface of the machine body 2, and their longitudinal directions (the It is movable only in the axial direction of the tie bar 4. A guide device using the linear guide 8 and the guide rail 9 is conventionally known.

The support member 7 includes a horizontal installation plate 7a and a pair of leg portions 7b and 7b that are integrally provided upright on both sides of the installation plate 7a with a gap in the width direction of the fixed mold attachment portion 6. The upper ends of the leg portions 7b, 7b are integrally formed on the side opposite to the nozzle insertion surface 6a of the fixed mold mounting portion 6 in the vicinity of both sides of the nozzle insertion hole 6b formed in the center of the fixed mold mounting portion 6. The mounting plate 7a is fixed to the upper surface of the machine body 2 with a bolt or the like, so that the fixed mold mounting portion 6 is fixedly supported on the machine body 2.
The upper end portions of the leg portions 7a, 7a are not integrally coupled to the side opposite to the die mounting surface 6a of the fixed mold mounting portion 6 but can be separated by bolts or the like so as to be integrally coupled. Good.
The linear guides 8 and 8 are fixed to the lower portions on both sides in the width direction of the movable platen 5 and are supported and guided by the guide rails 9 and 9 like the fixed platen 3, and can move only in the longitudinal direction thereof. Yes. When supporting and guiding the lower part of the movable platen 5 in this way, the movable platen 5 need not be supported by the tie bar 4. Further, the linear guides 8 and 8 of the movable platen 5 are not supported and guided by the guide rails 9 and 9 that support and guide the linear guides 8 and 8 of the fixed platen 3, but are supported and guided by separately installed guide rails. It may be.

  An injection device is installed on the machine body 2 at a position spaced from the anti-mold mounting surface 6a side of the fixed mold mounting portion 6 in the mold clamping device 1, and the heating cylinder 10 is fixed to the fixed body mounting section 6a. It is arranged on the extension of the axis of the nozzle insertion hole 6b of the mold mounting part 6. The injection device is connected to the support member 7 by a conventionally known nozzle driving device (not shown), and an injection nozzle (nozzle) provided at the tip of the heating cylinder 10 by operating the nozzle driving device. 10a contacts the fixed mold K1 attached to the fixed mold attachment portion 6 through the nozzle insertion hole 6b, and performs a nozzle touch operation that leaves the fixed mold K1 and escapes from the nozzle insertion hole. It is like that. Instead of connecting one end of the nozzle drive device to the support member 7, the nozzle drive device is connected directly or indirectly to an appropriate position of the machine body 2, and the other end is connected to the injection device to pull or push the injection device. It may be moved to perform a nozzle touch operation.

Next, the operation of the mold clamping device 1 of the injection molding machine having the above configuration will be described.
At the start of the molding operation, the injection device is pulled by the nozzle drive device and moved forward along the guide rail on the machine body 2 from its standby position to the mold clamping device 1 side. A nozzle touch operation is performed in which the injection nozzle 10a comes into contact with the fixed mold K1 fixed to the fixed mold mounting portion 6 of the fixed platen 3 with a predetermined force. In this nozzle touch operation, as shown in FIG. 3, the fixed mold mounting portion 6 is pushed by the pressing force of the injection nozzle 10a and slightly moves to the movable platen 5 side (left side in FIGS. 1 and 3). Simultaneously with the movement, the support member 7 is deformed so as to fall to the movable platen 5 side by the pressing force. However, the lower end portion of the fixed mold mounting portion 6 is supported so as to be movable only in the axial direction of the tie bar 4 with respect to the guide rails 9 and 9 on the machine body 2 via the linear guides 8 and 8. Therefore, it is hardly affected by the deformation of the support member 7, does not fall to the movable platen 5 side, and moves only slightly to the movable platen 5 side.
As described above, the fixed mold mounting portion 6 of the fixed platen 3 is fixedly supported on the machine body 2 by the support member 7 on the side opposite to the mold mounting surface 6a, and the nozzle driving device is mounted on the fixed mold. Since it is not connected to the part 6, it can be reliably prevented from falling to the movable platen 5 side by the pressing force of the injection nozzle 10a during the nozzle touch operation regardless of the arrangement of the nozzle driving device.

In addition, after the nozzle touch operation, prior to the injection of the molten resin by the injection device, the movable platen 5 is moved to the fixed platen 3 side by the movable platen drive mechanism, and the molds K1, K2 are closed and clamped. However, since the lower end portion of the movable platen 5 is supported by the guide rails 9 and 9 via the linear guides 8 and 8, the movable platen 5 and the fixed mold mounting portion 6 that does not fall down are provided. Is maintained accurately, and the molds K1 and K2 are accurately clamped. Therefore, unlike the prior art, it is not necessary to adjust the rollers and slide plates provided in the lower part of the movable platen 5 to ensure the parallelism between the movable platen 5 and the fixed mold mounting portion 6 (fixed platen 3). That's it.
When the support member 7 is integrally coupled to the side of the fixed mold mounting portion 6 opposite to the mold mounting surface 6a, the amount of deformation of the fixed mold mounting portion 6 and the support member 7 during the nozzle touch operation. It is preferable to determine the size and shape of each of these parts so that the deformation of the support member 7 does not affect the falling of the fixed mold attaching part 6 by using analysis simulation or the like.

As described above, the mold clamping device 1 of the injection molding machine according to the above embodiment has the guide rail in which the fixed guide 3 fixes the linear guides 8 and 8 fixed to the lower end thereof on the machine body 2. 9 and 9, a fixed mold mounting portion 6 for mounting a fixed mold K1 supported so as to be movable only in the mold opening and closing direction, and an upper mold portion of the fixed mold mounting portion 6 opposite to the mold mounting. On the surface 6a side, there is provided a support member 7 that is coupled to the vicinity of both sides of the nozzle insertion hole 6b, has a lower end portion fixed to the machine body 2 and fixedly supports the fixed mold mounting portion 6 on the machine body 2. It is configured.
Therefore, according to the mold clamping apparatus 1 of the mold injection molding machine according to the embodiment, the fixed mold mounting portion 6 of the stationary platen 3 is attached to the machine body 2 by the support member 7 on the side opposite to the mold mounting surface 6a. Since it is fixedly supported and the nozzle driving device is not connected to the fixed mold mounting portion 6, it is tilted to the movable platen 5 side by the pressing force of the injection nozzle 10 a during the nozzle touch operation regardless of the arrangement of the nozzle driving device. Can be reliably prevented.

  Therefore, as in the prior art, the arrangement of the mounting portion of the nozzle driving device to the stationary platen 3 is devised so that no bending moment is generated on the stationary platen 3 to bring it down to the movable platen 5 side. Since there is no need to reinforce with ribs, the arrangement of the nozzle drive device becomes free, and the arrangement around the heating cylinder 10 becomes unnecessary, and workability at the time of maintenance work around the heating cylinder 10 or purging of the resin Can be improved. Further, when the nozzle drive device is configured not to be connected to the fixed mold mounting portion 6 or the support member 7 (fixed platen 3), when the injection device is to be turned for the replacement operation of the heating cylinder 10 or the like, The operation of releasing the connection of the nozzle driving device with the stationary platen 3 becomes unnecessary, and the replacement operation of the heating cylinder 10 can be performed efficiently. Further, it is not necessary to increase the strength of the machine body 2 or the fixed platen 3, the mass of the entire machine is not increased, and the support rigidity of the fixed platen 3 with respect to the machine body 2 is not reduced.

Next, FIGS. 4 and 5 show a mold clamping device 1A of an injection molding machine according to a second embodiment of the present invention. The mold clamping device 1A has a configuration in which the fixed mold mounting portion 6 in the mold clamping device 1 of the injection molding machine according to the first embodiment includes a connecting plate portion 11 to which one end portion of a tie bar 4 is mounted. The anti-die mounting surface side 11a of the connecting plate portion 11 is fixedly supported on the machine body 2 by a support member 7A, and the fixed die mounting plate portion 6 is supported by the tie bar 4 so as to be movable in the axial direction. Has been.
Since other configurations are the same as those of the mold clamping device 1 of the injection molding machine according to the first embodiment, the same or similar components will be described with the same reference numerals.

  The connecting plate portion 11 has a nozzle insertion hole 11b communicating with the nozzle insertion hole 6b of the fixed mold mounting portion 6 in the center in a side view (FIG. 5), and cutout portions 11c and 11c are provided at upper and lower portions thereof. The one end of the tie bar 4 is attached to the four corners, and the anti-mold mounting surface 6a of the fixed mold mounting plate 6 is brought into contact with and separated from the mold mounting side surface 11d. It has become so. Further, the support member 7A includes a leg portion 12 provided with an installation plate 12a at the lower end and an upper end portion integrally coupled to the connecting plate portion 11 in the vicinity of the lower portion of the nozzle insertion hole 11b. It is fixed on the machine body 2 with bolts or the like, and the anti-mold mounting side surface 11 a of the connecting plate portion 11 is fixedly supported on the machine body 2.

In the mold clamping device 1A of the injection molding machine according to the second embodiment, when the nozzle touch operation is performed by the nozzle driving device that connects the support member 7A or the machine body 2 and the injection device, the injection nozzle The mold mounting plate portion 6 is pushed toward the movable platen 5 by the pressing force 10a. At this time, the fixed mold mounting portion 6 is guided by the tie bar 4 and the lower ends thereof are linear guides 8 and 8. Through the guide rails 9, 9 provided on the machine body 2 through the tie bar 4 so as to be guided and moved in the axial direction of the tie bar 4. The mold mounting plate 6 does not fall to the movable platen 5 side, and the same operation and effect as the mold clamping device 1 of the injection molding machine according to the first embodiment are exhibited. Furthermore, since the supporting member 7A supports the tension acting on the tie bar 4 during mold clamping via the connecting plate portion 11, it is possible to reliably suppress the deformation of the fixed mold mounting portion 6 due to the tension.
In the case of this mold clamping device 1A, the lower end portion of the fixed mold mounting portion 6 is supported by a guide device including a linear guide 8 and a guide rail 9, so that it is not necessarily required to be supported by the tie bar 4.

  In the mold clamping device 1, 1A of the injection molding machine according to the above embodiment, the fixed plate 3 and the end plate are connected by a tie bar 4, and the movable plate 5 is positioned between them and supported by the tie bar. Is moved forward and backward with respect to the fixed plate 3 by a movable plate driving mechanism provided between the movable plate 5 and the end plate, and the molds K1 and K2 attached to the fixed plate 3 and the movable plate 5 are moved. Although an example in which the present invention is applied to a mold clamping device that performs opening and closing and mold clamping has been shown, the present invention is not limited thereto, and an end plate is not provided, and a movable platen 5 is provided at the other end of the tie bar 4. The present invention can also be applied to a mold clamping device that is fixed and pulled and pulled and clamped by pulling one end side of the tie bar 4 in the axial direction by a movable plate driving mechanism provided on the fixed platen 3.

It is a front view of the mold clamping apparatus of the injection molding machine which concerns on the 1st Embodiment of this invention. It is a side view similarly. It is explanatory drawing of an effect | action similarly. It is a front view of the mold clamping apparatus of the injection molding machine which concerns on the 2nd Embodiment of this invention. It is a side view similarly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A Clamping machine 2 Machine body 3 Fixed board 4 Tie bar 5 Movable board 6 Fixed mold mounting part 6a Anti-mold mounting surface 6b, 11b Nozzle insertion hole 7, 7A Support member 7a, 12 Leg part 7b, 12a Installation plate 8 Linear guide 9 Guide rail 10 Heating cylinder 10a Injection nozzle 11 Connecting plate

Claims (2)

A fixed platen standing on the machine body and a movable platen arranged opposite to the fixed platen are provided, and the movable platen is movable with respect to the fixed platen by a movable platen drive mechanism connected to the fixed platen by a plurality of tie bars. In a mold clamping device of an injection molding machine that opens and closes the mold, opens and closes the mold on the fixed side attached to the fixed platen and the movable side die attached to the movable platen, and performs mold clamping.
The fixed plate has a fixed mold mounting portion for mounting a fixed mold whose lower end is supported on the machine body so as to be movable only in a mold opening / closing direction, and an anti-mold mounting of the fixed mold mounting portion. A mold clamping device for an injection molding machine, comprising: a support member which is fixedly supported on the machine body and deformable so as to fall down on the movable platen side . The fixed mold mounting part is provided with a connecting plate part with the tie bars attached to four corners on the side opposite to the mold mounting surface, and is provided so as to be able to contact and separate from the mold mounting side surface of the connecting plate part. 2. The mold clamping apparatus for an injection molding machine according to claim 1, wherein the member is provided integrally with the connecting plate portion.

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