JP4863221B2 - Mold fall prevention structure in mold clamping device - Google Patents

Description

  The present invention relates to a mold drop prevention structure in a mold clamping device that attaches a magnet plate to a die plate and prevents the mold clamped by the magnet plate from dropping.

  When clamping a mold with a magnet plate, the mold may drop when an excessive projecting force acts on the mold due to the overstroke of the projecting rod when releasing the molded product, or when the clamping force due to magnetic force decreases instantaneously. Since there is a possibility of deviation, a stop means for the molding machine and a drop prevention means for the mold are provided in preparation for such an unexpected situation.

  As a conventional mold drop prevention means, a lower end support device and an upper end restricting device for a mold are provided on a magnet plate, the lower end support device prevents the mold from sliding down, and the upper end restricting device prevents the mold from being fixed. There are some that prevent the mold from falling apart.

In addition, a plurality of block members having a die fixing surface are provided on the die adsorbing surface side of the magnet provided in the plate, and the magnetic force holding member provided in the block member is biased to the protruding side from the coil spring, In some cases, even if the mold is separated from the plate, the attracting state is maintained by the magnetic force holding member to prevent the drop.
JP 2003-320570 A JP 2003-326531 A

  To prevent the mold from falling off by both the conventional lower end supporting device and the upper end regulating device, a vertical T-groove is formed on the top and bottom of the magnet plate, and the support in the lower T-groove and the upper T-groove are formed. Since the inner engagement body is in contact with or engaged with the lower end of the mold by the drive mechanism of the drive motor and transmission screw shaft provided respectively, the motor must be driven each time the mold is attached or detached. In addition, since drive motor control means and contact / engagement detection / confirmation means are also required, the cost of the mold is increased and there is an economic problem.

  In addition, in the prevention of the detachment of the mold by the magnetic force holding member, since the adsorption of the mold at the time of separation becomes a partial adsorption for each magnetic force holding member, it cannot respond to the excessive projecting output due to the overstroke of the protruding rod. Has a problem.

  The present invention was conceived in order to solve the problems in the conventional mold drop prevention means, and the purpose thereof is to employ a locating ring used for mold positioning to prevent the mold from falling off. In addition, with the locating restraint action of the stopper member that occurs due to the relationship with the protruding rod, we provide a mold fall prevention structure in a new mold clamping device that can reliably prevent the mold from dropping due to excessive projection output There is to do.

The present invention according to the above object comprises a die plate having a rod insertion hole for a protruding rod, a mold having a locating ring protruding on a mold mounting surface having a protruding hole, and a receiving hole for the locating ring, It is composed of a magnet plate that overlaps the receiving hole with the rod insertion hole and is fixed to the surface of the die plate. The stopper member of the above mold is inserted into the ring wall of the locate ring so that it can be moved in and out of the ring. The stopper edge of the stopper member protrudes into the open end of the receiving hole on the locating ring insertion side, and the stopper member is sandwiched between the stopper edge and the rod body by the protruding action of the protruding rod The movement of the locating ring is restrained by interposing .

  The stopper member is made of a steel sphere, and the sphere is housed in holes formed in a plurality of locations on the lower wall portion of the locating ring. The stopper member is formed of a hemisphere having a spherical surface attached to one end face of the leaf spring, and the leaf spring is fixed to the inner side of the ring and the hemisphere is formed in at least three wall portions of the locating ring. Each of them is housed inside.

  The projecting rod includes a rod body having an outer diameter that prevents the stopper member from entering the ring in the locate ring, and a tip rod that is smaller in diameter than the rod body and projects from the tip surface. Is made of an outer diameter that allows the stopper member to be immersed in the receiving hole.

  The receiving hole is formed by a short cylinder that is fixed to the die plate and accommodated in the opening of the magnet plate, and the short cylinder has a cylinder length shorter than the plate thickness, and a locking edge of the stopper member. In the open end of the locating ring insertion side.

  In the present invention having the above-described configuration, the locate ring projecting on the mold mounting surface of the mold is housed in the ring wall part so as to be able to protrude into and out of the ring in relation to the rod position of the projecting rod, and the magnet plate side It is restrained by the locking edge projecting in the receiving hole of the metal and prevents the locating ring from coming out of the receiving hole, so even if the mold is separated from the magnet plate due to the overstroke of the protruding rod, it is held by the locating ring Never fall.

  In addition, if the protruding rod is in the retracted position, there is no interference of the protruding rod with the stopper member, so no special operation or means is required to clamp the mold with the magnet plate or remove it from the plate. Since the position of the mold is determined by the insertion of the locating ring, it becomes easier to clamp the mold than before.

  In the figure, 1 is a movable die plate, 2 is a fixed die plate, 3 and 3 'are magnet plates in which a large number of permanent electromagnetic magnets 3a and 3a are embedded in the board surface, and are attached to the opposing board surface of the movable die plate 1 and the fixed die plate 2. The movable side mold 41 and the fixed side mold 42 of the mold 4 are attached to the magnet plates 3 and 3 'by the magnetic force of the magnet. The movable die plate 1 is provided with a rod insertion hole 1a for the protruding rod 5.

  The movable side mold 41 and the fixed side mold 42 are provided with mold mounting plates 41a and 42a, and a projecting hole 41b of the projecting rod 5 is formed on the mold mounting surface of the plate body. In the movable mold inside the projecting hole 41b, a projecting plate 6 in which projecting pins 6a are implanted is provided so as to be able to advance and retreat by being pressed against the spring member 6b, and the outer mold mounting surface is made of steel. The locating ring 7 is provided with a flange 7a around the end portion fixed to the plate surface.

  The magnet plate 3 on the movable die plate side has a receiving hole for a locating ring 7 located between the rod insertion hole 1a drilled in the movable die plate 1 and the protruding hole 41b on the mold side. 8 is drilled. The receiving hole 8 is formed to have a diameter larger than the outer diameter of the locating ring 7 by an insertion clearance, and the opening end on the insertion side of the locating ring 7 is formed in a recess 8a in which the flange 7a is accommodated. Further, the lower half of the receiving hole 8 is formed in a shallow groove 8b that functions as a locking edge 9 in the opening end of the stopper member 11 described later by expanding the diameter excluding the boundary with the recess 8a. Note that the inner and outer surfaces of the locking edge 9 are formed as tapered surfaces that allow the stopper member 11 to smoothly enter the ring.

  The inner diameter of the locating ring 7 is substantially the same as the hole diameter of the rod insertion hole 1a, and the movable side mold 41 made of steel spheres is provided at three locations on the lower side wall close to the insertion end opposite to the flange 7a. An accommodation hole 10 for the stopper member 11 is formed. The accommodation hole 10 is a tapered hole whose outer opening is reduced in diameter, and a stopper member 11 is accommodated in the hole from the inside of the ring. The stopper member 11 in each hole is locked to the outer opening edge so that it can be moved in and out without falling off the ring.

  The protruding rod 5 includes a rod body 51 having an outer diameter that prevents the stopper member 11 from entering the ring within the locating ring 7, and a small-diameter tip mounted by providing a stepped portion on the distal end surface of the rod body 51. The rod 52 is made of a rod 52, and the tip rod 52 waits in the locate ring to allow the stopper member 11 to enter the ring, but forms a gap between the inner surface of the ring and preventing the stopper member 11 from coming off from the receiving hole 10. It consists of an outer diameter.

  In the above configuration, the locating ring 7 is inserted into the receiving hole 8 so that the movable mold 41 is brought into contact with the magnet plate 3, and the movable mold 41 can be clamped to the movable die plate 1 by the magnetic force of the magnet. When the locating ring 7 is inserted, the stopper member 11 protrudes from the receiving hole 10 to the outside of the ring due to its own weight on the lower side of the ring, but when the locating ring 7 is inserted into the receiving hole 8, as shown in FIG. Further, the stopper member 11 hits the locking edge 9 and is pushed up from the outside of the ring to the inside of the ring. As a result, the stopper member 11 enters the receiving hole 10 and gets over the locking edge 9.

  As shown in FIG. 6, the locate ring 7 is inserted into the receiving hole 8 until the die attachment surface of the die attachment plate 41a contacts the magnet plate 3, and the flange 7a is also accommodated in the recess 8a. . The stopper member 11 is located in the shallow groove 8 b below the receiving hole 8.

  The stopper member 11 is pushed up by the locking edge 9 when the protruding rod 5 is in the retracted position and the distal end rod 52 is in the ring and is positioned on the locking edge 9. Therefore, the stopper member 11 does not become an obstacle to the removal of the movable mold 41. Therefore, even if the locating ring 7 includes the stopper member 11, the movable side mold 41 is not clamped or removed by the magnet plate 3 without using any special operation or means as in the case where the locating ring 7 is not provided. Can be easily done.

  However, as shown in FIG. 7, when the rod body 51 reaches the protrusion hole 41 b and is positioned on the locking edge 9 by the protrusion operation of the protrusion rod 5, the outer diameter of the rod body 51 is larger than that of the tip rod 52. Because of the large diameter, the gap between the ring wall surface and the rod is narrowed. When the locating ring 7 is extracted in such a state, even if the stopper member 11 hits the locking edge 9 and is pushed up into the ring, the rod main body 51 does not get into the accommodation hole 10 because it gets in the way, It will be in the state which protruded from both inside and outside of a ring wall part. For this reason, the stopper member 11 is interposed between the rod body 51 inside the locking edge 9. As a result, the locating ring 7 is restrained by the stopper member 11 and cannot move in the extraction direction, but is fixed to the magnet plate 3.

  Therefore, the protruding rod 5 overstrokes for some reason when the molded product is released after the mold is opened, and an excessive projecting force acts on the movable side mold 41, and the projecting output is larger than the magnetic force in the magnet plate 3. Even if the movable side mold 41 is protruded from the magnet plate 3 and the locating ring 7 moves in the direction of pulling out the receiving hole 8, the stopper member 11 contacts the rod body 51 at the locking edge 9. The movable die 41 is supported by the magnet plate 3 with the locating ring 7 and is dropped from the movable die plate 1 because it is caught between them and prevents the locating ring 7 from coming out of the receiving hole 8. Is prevented.

  FIG. 8 shows another embodiment in which the receiving hole 8 is configured by a short cylinder 81 which is housed in an opening 8 ′ formed in the magnet plate 3 and is fixed to the movable die plate 1. The short cylinder 81 has a cylinder length shorter than the plate thickness, and the cylinder has a shallow groove 8 b and a locking edge 9 in the lower half portion, like the receiving hole 8. The short cylinder 81 is shifted to the movable die plate side and fitted into the opening 8 ', and a recess 8a is formed in the opening end due to the difference between the plate thickness and the cylinder length. The flange 7a of the locate ring 7 can be accommodated in the recess 8a.

  9 and 10 show an embodiment in which the stopper member is provided in the three vertical directions of the locating ring 7. The stopper member 11 ′ is formed of a hemispherical body having a spherical surface attached to one end face of an elongated leaf spring 12, and the leaf spring 12 is fixed to the inner side of the ring by spot welding to attach the hemisphere to the ring wall of the locating ring 7. Each is accommodated in an accommodation hole 10 ′ drilled in three directions with the spherical surface on the outside.

  In this embodiment, since the stopper member 11 'is supported by the leaf spring 12 fixed to the ring wall, even if the accommodation hole 10' is not formed as a tapered hole, the stopper member 11 'is not dropped from the hole due to its own weight, and the locking edge 9 Because the plate spring 12 is easily bent by being pushed up, the arrangement thereof is not limited to the lower side of the locating ring 7 as in the case of a sphere, and can be arranged on the upper side. Further, the locking edge 9 can also be formed by projecting the opening end on the ring insertion side which is a boundary with the recess 8a in an annular shape, so that it is not necessary to form a partial shallow groove by expanding the diameter. Although the distance becomes longer, the distal end rod 52 can be omitted.

  Although not shown in the drawing, the lower half of the locating ring 7 is the above-mentioned stopper member 11 made of a sphere, and the upper half is made of a hemispherical stopper member 11 ′ supported by a leaf spring 12. Restraining at a location can also prevent the mold from dropping.

  Although all the above embodiments are directed to a horizontal mold clamping device, the embodiments shown in FIGS. 9 and 10 are such that the stopper member 11 ′ is fixed to the locating ring 7 by the leaf spring 12. Therefore, it can be adopted as a magnet plate of a movable die plate located at the upper part of the vertical mold clamping device to prevent the mold from dropping.

It is a partial vertical side view of the mold clamping apparatus provided with the metal mold | die fall prevention structure which concerns on this invention. It is a front view of a movable die plate same as the above. It is a vertical side view of the fall prevention structure of a metal mold | die. It is a vertical front view of the fall prevention structure of a metal mold | die. It is a vertical side view of the fall prevention structure of the metal mold | die at the time of locating ring insertion. It is a vertical side view which shows the state which adsorb | sucked the movable side metal mold | die to the magnet plate, and was attached to the movable die plate. It is a vertical side view which shows the restraint state of the locate ring by a stopper member. It is a vertical side view which shows other embodiment comprised by the other member which provided the receiving hole of the locate ring in the opening part of the magnet plate. It is a longitudinal cross-sectional view (FIG. 10A-A line) of the fall prevention structure of the metal mold | die by the stopper member of other embodiment. It is a longitudinal front view same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Movable die plate 1a Rod insertion hole 3 Magnet plate 4 Mold 5 Protruding rod 7 Locating ring 7a Flange 8 Receiving hole 8a Recess 9 Locking edge 10, 10 'Accommodating hole 11, 11' Stopper member 12 Leaf spring 41 Movable side Mold 41b Rod hole 51 Rod body 52 Tip rod

Claims (5)

A die plate with a rod insertion hole for the protruding rod;
A mold with a locating ring projecting on a mold mounting surface with a projecting hole;
It has a receiving hole for the above locate ring and consists of a magnet plate that overlaps the receiving hole with a rod insertion hole and fastened to the surface of the die plate,
The stopper member of the mold is accommodated in a receiving hole formed in the ring wall portion of the locate ring so that the stopper member can be moved in and out of the ring, and the stopper edge of the stopper member projects into the opening end of the receiving hole on the locating ring insertion side. and set,
The mold is prevented from dropping in the mold clamping device , wherein the stopper member is interposed between the locking edge and the rod body by the projecting operation of the projecting rod to restrict the movement of the locating ring. Construction.   2. The mold for a mold clamping apparatus according to claim 1, wherein the stopper member is made of a steel sphere, and the sphere is housed in holes formed in a plurality of locations on the lower wall portion of the locating ring. Fall prevention structure.   The stopper member is formed of a hemisphere attached to one end face of the leaf spring with the spherical surface on the outside, and the leaf spring is fixed to the inner side of the ring, and the hemisphere is drilled in at least three wall portions of the locate ring. The mold drop prevention structure in the mold clamping apparatus according to claim 1, wherein the mold drop prevention structure is housed in the mold clamping apparatus.   The projecting rod includes an outer diameter rod body that prevents the stopper member from entering the ring within the locate ring, and a distal end rod that is smaller in diameter than the rod body and projects from the distal end surface. 2. The mold drop prevention structure for a mold clamping apparatus according to claim 1, wherein the mold member has an outer diameter that allows the stopper member to be immersed in the receiving hole.   The receiving hole is formed by a short cylinder that is fixed to the die plate and accommodated in the opening of the magnet plate. The short cylinder is shorter than the plate thickness, and the locking edge of the stopper member is formed. 2. The mold drop prevention structure for a mold clamping apparatus according to claim 1, wherein the structure is provided in an opening end on a locating ring insertion side.

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