JP4234735B2 - Mold fixing device - Google Patents

Description

  The present invention relates to a mold fixing device in an injection molding machine or the like, and particularly used in a horizontal molding machine or the like, wherein the mold is combined by combining a magnetic force by a permanent magnet and an electromagnetic force by an electromagnet. The present invention relates to a mold fixing device having a permanent electromagnetic chuck mechanism that can adsorb the material appropriately.

In general, as a method of fixing a mold in an injection molding machine or the like, various molds can be mounted on a mounting base on each of a movable side and a fixed side via a predetermined mold fixing device. is there. Specifically, the mold bottom surface portion is attached to one surface side of the mold fixing device via a magnetic force or the like, and the mold fixing device to which such a mold is attached has a predetermined shape on the mounting base. It can be attached via a clamping device or the like. By the way, in a mold fixing apparatus using such a magnetic force, the magnetic force is exerted on the mold fixing surface by passing an electric current through an electromagnet or the like, or the magnetic force is erased to fix or fix the mold. It is intended to cancel. As a result, mold replacement work and the like are performed smoothly. However, in such a mold fixing method using magnetic force, when the molded product is taken out from the mold, the mold is partially removed from the surface of the mold fixing device due to the force acting on the mold. There is a problem that the magnetic force acting on the mold is suddenly lowered and the mold may fall due to separation. In order to solve such problems, in a mold fixing device using magnetic force, that is, a permanent electromagnetic chuck mechanism, a vacuum chuck mechanism is further added in addition to the magnetic force method. The one of the system (see Patent Document 1) and the like can be mentioned.
JP 2005-246634 A

  By the way, in the thing which has the said vacuum chuck mechanism, the extra apparatus for vacuum chuck mechanism formation including a vacuum generator is needed, a die fixing apparatus becomes complicated, and the cost of the whole apparatus is also high. There is a problem that it must be. In order to solve such a problem, an auxiliary mechanism for preventing dropping is formed with a simple structure, and it is easy to use as a mold fixing device, and also has excellent functionality ( An object (problem) of the present invention is to provide a mold fixing device.

In order to solve the above problems, the following measures are taken in the present invention. That is, in the first invention according to the first aspect of the present invention, the fixed mold mounting base on which the fixed mold is mounted , and the guide provided between the fixed mold mounting base and the base. relative movement through the rail is provided so as to be, and which is used in plastic molding machines the fixed mold and the movable mold having a movable mold mounting foundation underlying mounted the movable mold The mold fixing device, which serves to fix the mold to each mounting base , operates so as to adsorb the above molds as appropriate by the combination of the magnetic force formed by the permanent magnet and the electromagnetic force formed by the electromagnet. to permanent well as to consist structure having an electromagnetic chuck mechanism, on the side in contact with the mold of the present mold fixation device, formed on the distal end portion of the previously provided engagement projections on the bottom surface of the mold The flange is formed so as to extend toward the upper end of the die fastening device with consisting transverse cross-sectional configuration of the shaped there are T-shaped groove intended to fit into the slideably moved predetermined length of the lower A guide groove is provided, and a stopper that functions to keep the engaging projection in a predetermined position is provided at the longitudinal end portion of the guide groove.

  Next, in the second invention which is the invention according to claim 2, the mold fixing device according to claim 1 is formed at the upper end portion of the guide groove so that the width becomes narrower downward. The funnel-shaped introduction portion is provided, and the planar shape of the overhanging portion that forms the T-groove existing in the formation of the introduction portion is adapted to the shape of the introduction portion. It was decided to adopt a configuration made up of forms.

  According to the first invention, the attachment / detachment of the die to / from the die fixing device is smoothly performed by the operation of the permanent electromagnetic chuck mechanism provided in the die fixing device. Still further, in the present invention, when the mold is attached to the mold fixing device, the flange formed at the tip of the engaging projection provided on the mold side is fixed to the mold. Since it engages in a state of being fitted in the guide groove provided in the device, the bottom surface of the mold and the permanent electromagnetic chuck mechanism surface of the mold fixing device should be momentarily separated. Even if there is, the flange of the engaging projection provided on the mold side is hooked to the overhang portion of the T-groove guide groove, and the mold does not fall off at once. . As a result, due to the action of magnetic force, the bottom surface of the mold and the permanent electromagnetic chuck mechanism surface of the mold fixing device come to attract each other again, and both attract each other. Further, in the present invention, a stopper formed so as to retain the engaging protrusion provided on the mold side in a predetermined position is provided at the longitudinal lower end portion of the guide groove. Therefore, the relative positioning between the mold and the mold fixing device can be performed smoothly, and the mounting (mounting) of the mold to the mold fixing device can be performed smoothly. That is, the mold exchange operation and the like can be performed smoothly and efficiently.

  Further, according to the second invention, the upper end portion of the guide groove is provided with an introduction portion having a funnel-like shape. At the time of mounting, the flange of the engaging projection provided on the mold side can be guided to the introduction portion opened in the funnel shape so that the flange can be smoothly slid into the guide groove. become. As a result, it is possible to perform mold replacement and the like smoothly and efficiently.

  The best mode for carrying out the present invention will be described with reference to FIGS. The present embodiment relates to a mold mounting apparatus for mounting a set of molds including a fixed mold 2 and a movable mold 3 to an injection molding machine as shown in FIG. is there. As shown in FIG. 1, the specific configuration is a base on which the fixed mold 2 is mounted, and a fixed mold mounting base 4 provided with a mold fixing device 1 interposed therebetween. It is a base on which the movable mold 3 is mounted, and is basically composed of a movable mold mounting base 5 provided with the mold fixing device 1 interposed therebetween. .

  In this structure, a plurality of guide rails 55 are provided between the base 7 and the fixed mold mounting base 4 so as to be parallel in the lateral direction. The movable mold mounting base 5 can be slid between the base 7 and the fixed mold mounting base 4 through the guide rail 55. By adopting such a configuration, a mold opening operation or a mold clamping operation between the fixed mold 2 and the movable mold 3 is smoothly performed. Further, an injection device 6 for feeding raw materials into cavities formed in both molds 2 and 3 is provided on the fixed mold mounting base 4 side having such a configuration.

  In the structure having such a basic configuration, a specific configuration of the mold fixing device 1 as a connecting means used when mounting the molds 2 and 3 to the mounting bases 4 and 5 will be described with reference to FIGS. This will be explained based on the above. First, as the present mold fixing device 1, an existing permanent electromagnetic chuck mechanism 15 is provided on one surface side thereof, particularly on the surface side to which the molds 2 and 3 are attached. . The permanent electromagnetic chuck mechanism 15 generates a magnetic force by energizing the coil with a permanent magnet formed so that a predetermined magnetic force always acts, and cancels the magnetic force caused by the permanent magnet. As a result, the mold mounting surface of the mold fixing device 1 is composed of a combination mechanism with an electromagnet that operates so as not to generate a mold attractive force based on magnetic force.

In such a built-in permanent electromagnetic chuck mechanism 15, a guide groove 12 having a predetermined cross-sectional shape as shown in FIGS. 2 and 3 is provided on each mold mounting surface side. Yes. As shown in FIGS. 1 and 2, the guide groove 12 is provided in the vertical direction (longitudinal direction) on the mold mounting surface side of the mold fixing device 1, and is from the center point (O ₁ ). Is provided at a position on the upper side so as not to interfere with a raw material inlet (not shown) provided near the center of the injection device 6. Such a guide groove 12 has a cross-sectional shape basically having a T-groove shape as shown in FIG. 1 and FIG. 3, and is described later with a fixed mold 2 and a movable mold 3. It has an overhang part 122 formed so as to hold each flange 211, 311 formed at the tip part of the engaging projections 21, 31 provided on the bottom part of is there.

  That is, the engagement protrusions 21 and 31 serving as guide pins are provided at the bottom surfaces 29 and 39 of the molds 2 and 3, respectively. Specifically, as shown in FIG. 1, an engagement protrusion 21 having a pin shape is provided at a bottom surface portion 29 of the fixed mold 2 so as to be perpendicular to the surface. A flange 211 formed so as to be slidable by being fitted in the guide groove 12 provided in the mold fixing device 1 is provided at the tip of the engagement protrusion 21. It has become. Similarly, an engaging projection 31 serving as a guide pin is provided at the bottom surface 39 of the movable mold 3 and a flange 311 is provided at the tip thereof. (See FIG. 1). In a state where the flanges 211 and 311 provided on the molds 2 and 3 side having such a configuration are fitted in the guide grooves 12 provided in the mold fixing device 1, the molds 2 and 3 are provided. Are securely engaged with the guide groove 12 via the flanges 211 and 311, respectively, from the surface having the permanent electromagnetic chuck mechanism 15 of the mold fixing device 1 of each mold 2 and 3. Dropout is prevented.

  Further, as shown in FIG. 2, the guide groove 12 having such a configuration is provided with an introduction portion 11 having an upwardly opened state, that is, a funnel-shaped configuration, as shown in FIG. It is supposed to be. Where the introduction portion 11 is present, the overhang portion 122 is also cut out in an upwardly opened state, and the engagement protrusions 21 and 31 provided on the bottom surface portions of the molds 2 and 3 are provided. Furthermore, the insertion (introduction) of the flanges 211 and 311 provided at the tip end portion is performed smoothly. As a result, the work of attaching the molds 2 and 3 to the mold fixing device 1 is performed smoothly.

  Further, at the lowermost end portion of the guide groove 12 having such a structure, as shown in FIGS. 2 and 3, for example, the engagement protrusions 21 and 31 provided on the molds 2 and 3 are engaged. In addition, a stopper 125 is provided for positioning the molds 2 and 3 in the vertical direction. By providing such a stopper 125, attachment work including positioning of the molds 2 and 3 to the mold fixing device 1 is smoothly performed. Note that a plurality of sets of drop-off prevention mechanisms based on the engaging action between the guide groove 12 having such a configuration and the engaging protrusions 21 and 31 are provided at the bottom surfaces 29 and 39 of the molds 2 and 3. You may make it provide. In a state where the molds 2 and 3 are attached to the mold fixing device 1 having such a configuration, such a mold fixing device 1 is replaced with a predetermined clamping device 9 as shown in FIG. Then, it is attached (fixed) to the fixed mold mounting base 4 or the movable mold mounting base 5. In this way, the mounting work of the molds 2 and 3 to the plastic molding machine is performed. On the other hand, when replacing the molds 2 and 3 attached to the mounting bases 4 and 5 in this way (mold changing work), the permanent electromagnetic chuck mechanism in each mold fixing device 1 is used. The magnetic force on the surface side having 15 is erased, and only the molds 2 and 3 are detached. As described above, in the present embodiment, the dies 2 and 3 are attached and detached on the basis of the ON / OFF operation of the permanent electromagnetic chuck mechanism 15, and the detachment work is performed using the molds. By guiding the flanges 211 and 311 of the engagement protrusions 21 and 31 provided on the molds 2 and 3 side to the introduction portion 11 opened like a funnel, the flanges 211 and 311 are guided into the guide groove 12. It will be possible to slide smoothly into. As a result, the exchange work of the molds 2 and 3 can be performed smoothly and efficiently.

1 is an elevation view showing the overall configuration of the present invention. It is a perspective view which shows the whole structure of the metal mold | die fixing device which makes the principal part of this invention. It is a figure which shows the state which the engagement protrusion provided in the metal mold | die side is engaging with the guide groove of a metal mold | die fixing device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold fixing device 11 Introduction part 12 Guide groove 122 Overhang part 125 Stopper 15 Permanent electromagnetic chuck mechanism 2 Fixed mold 21 Engagement protrusion 211 Flange 29 Bottom face part 3 Movable mold 31 Engagement protrusion 311 Flange 39 Bottom face part 4 Fixed mold Mounting base for mold 5 Mounting base for movable mold 55 Guide rail 6 Injection device 7 Base 9 Clamping device

Claims (2)

A fixed mold mounting base on which the fixed mold is mounted and a guide rail provided between the fixed mold mounting base and the base are provided so as to be relatively movable and movable. A mold fixing device used for a plastic molding machine having a mounting base for a movable mold to be a base on which a mold is mounted, and which serves to fix the fixed mold and the movable mold to each mounting base. And a permanent electromagnetic chuck mechanism that operates to adsorb the mold as appropriate by a combination of a magnetic force formed by a permanent magnet and an electromagnetic force formed by an electromagnet. A flange formed at the front end of an engagement projection provided in advance on the bottom surface of each mold is fitted on the surface of the mold fixing device in contact with the mold so as to be slidable. A guide groove having a T-groove cross-sectional shape and extending downward from the upper end of the mold fixing device by a predetermined length is provided. A die fixing device comprising a configuration in which a stopper that functions to retain the engaging protrusion at a predetermined position is provided at a longitudinal end portion.   The mold fixing device according to claim 1, wherein an introduction portion having a funnel shape formed so as to be narrowed downward is provided at an upper end portion of the guide groove, and A mold fixing device characterized in that a planar form of an overhang part for forming the T-groove existing at a place where an introduction part is formed is formed in a funnel shape in accordance with the form of the introduction part.

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