JP2008062554A - Mold clamping method and mold clamping device in synthetic resin molding machine for securing clamping method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the structure by simplifying a driving apparatus for a rod on a male side. <P>SOLUTION: In case of rocking a template 13 by the mold clamping mechanism 30 described above so that it may not be moved in the mold opening direction at the mold clamp starting position, by making a rod of 33 and 34 which has respectively a detachable male and female coupling device 31 and 32 comprising at least four sets of a couple of the detachable coupling device 31 and 32 arranged at the mold clamping mechanism 30 approach each other in the axial direction, by engaging the coupling device 31 and 32 which are set at the top of a couple of rod 33 and 34, then by making the rod 34 at the female side described above rotate around the axis and by making the female coupling device 32 engage each other to the male coupling device 31 described above by connecting to be unified and the clamping has done. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mold clamping method and a clamping device in a mold synthetic resin molding machine for carrying out this method.

An example of a mold clamping device in a conventional blow molding machine will be described.
The mold clamping device in this conventional blow molding machine moves slightly in the mold opening and closing direction to a pair of left and right gantry guided so as to be able to approach and separate from the rail laid on the base, and a vertical plate of the gantry. A pair of stencils that are freely supported, a split mold attached to each of the stencils, and the bases open when the split dies are closed by bringing the base plate close together with the base. A locking mechanism is provided for locking so as not to move in the direction. A spindle nut portion protruding toward the base is provided on the gantry, and screw portions in opposite directions of a spindle that are rotated forward and backward by a motor are screwed into the spindle nut portion. In addition, piston rods of a plurality of fluid pressure cylinders supported by intermediate plates integrally provided on the gantry are fixed to the template.
In the mold clamping device in the conventional blow molding machine, after the parison is pushed out from the extrusion die between the molds that have been opened, the spindle is rotated in the mold closing direction by a motor so that the molds can be moved together with the gantry. Move and close the mold, lock it so that it does not move in the mold opening direction by the lock mold clamping mechanism, hold the parison, and then apply the mold clamping force to the split mold by the lock mold clamping mechanism to clamp the mold Do.
The lock clamping mechanism (see FIG. 7) in the prior art includes at least one pair of four females and a rod having a male detachable engaging portion at the tip, and the female side of each pair of rods The length of the rod is fixed, and the male rod is fed in a direction approaching the female rod by a mold clamping plate feeder (for example, a hydraulic cylinder or an electric ball screw). Part enters the hooking part of the female rod, the male rod is temporarily stopped 10 to 50 mm before the closing limit of the split mold, and then rotated 90 ° around its axis, The engaging part of the rod on this side engages and engages with the engaging part on the female side rod, and then the male side rod is further moved away from the female side rod. The mold clamping force is generated (Patent Document 1).
JP 61-192534 A

Therefore, in the lock clamping mechanism in the prior art, the movement stroke of the male rod is determined by the feed dimension of the gantry. As a result, the mold thickness, that is, the split mold is the mold. Although the space between the divided molds when opened is suitable for mold clamping of the divided molds, it cannot be applied when the mold thickness is not constant, and there is a lack of versatility.
Since the male-side rod uses a composite hydraulic cylinder that moves in the axial direction and rotates around the axial line, it has a complicated hydraulic cylinder structure as a driving device.

The invention according to the present application has been made in view of the above-described problems of the prior art, and aims to simplify the structure of the male rod drive device and simplify the structure.
Further, according to the present invention, the female rod is provided with a driving device for moving in the axial direction and a rotation mechanism for locking that rotates the rod around the axis of the rod, thereby simplifying the structure of the male rod. At the same time, another object is to be able to cope with changes in the mold thickness of the split mold.

In order to achieve the above object, the specific invention moves the pair of left and right bases in the mold closing direction, and moves the split molds attached to the pair of mold plates supported by the vertical plates of the base to close the molds. In the method of locking the mold so that the divided mold does not move in the mold opening direction by the lock mold clamping mechanism, and then performing mold clamping by applying a mold clamping force to the divided mold by the lock mold clamping mechanism,
In the lock mold clamping mechanism provided at the top and bottom of the template, at least one pair of females and a rod having a male and female detachable engaging portion at the tip are brought close to each other in the axial direction, and each pair of pairs After fitting the female and male hooks on the rod end of the rod, rotate the female rod around its axis and engage the female hook with the male hook. Connect, further move the male rod away from the female rod, generate the mold clamping force as the reaction force, remove the engagement portion when the mold is opened, separate the rod away and retreat, A die clamping method is characterized in that the rod tip position is positioned in the vicinity of an open space gap between divided molds formed by mold opening.

In order to achieve the above object, according to the related invention, a pair of left and right gantry guided so as to be able to approach and separate from a rail laid on a base, and a vertical plate of the gantry, respectively, are movable in a mold opening and closing direction A pair of supported mold plates, a divided mold attached to each of the mold plates, and when the divided molds are closed by bringing the mold plates close to each other together with the mount, the bases move in the mold opening direction. In a mold clamping device in a synthetic resin molding machine provided with a lock mold clamping mechanism for locking and clamping so as not to move,
The lock mold clamping mechanism includes a pair of left and right gantry guided so as to be able to approach and separate from a rail laid on a base, and a pair of vertical plates supported by the gantry so as to be movable in a mold opening / closing direction. A mold plate, a split mold attached to each of the mold plates, and a lock that prevents the bases from moving in the mold opening direction when the split mold is closed by bringing the base plate close together with the base. In a mold clamping device in a synthetic resin molding machine having a lock mold clamping mechanism for clamping
The lock mold clamping mechanism includes at least four pairs of rods having at least one horizontal pair female and a male engaging / disengaging engagement portion at the top and bottom of the mold plate, and the male side of the pair of horizontal pairs of rods. The rod is connected to a linear drive device so that it can move forward and backward by a predetermined stroke in the axial direction with respect to one mold plate, and the rod on the female side moves forward and backward in the axial direction on the other mold plate. It is possible, and when the female-side engaging part is fitted into the male-side engaging part, the female-male engaging part engages with each other so that it can be rotated forward and backward around this axis so as to be connected together. The male rod is capable of moving back and forth in the axial direction with respect to the male template, and the male rod is based on the male template and has a tensile force. The There a mold clamping apparatus in the synthetic resin molding machine, characterized in that raw to mechanism is provided.

The present invention has the following effects by the above configuration.
That is, at least one to four pairs of females and males arranged on the lock mold clamping mechanism, rods having detachable engaging portions at the tips thereof are made close to each other in the axial direction, and provided at the tip ends of the pair of rods of each set. After engaging the female and male hooks, rotate the female rod around its axis, engage the female hook with the male hook, and connect them together. By moving the rod in the direction away from the female rod and generating the mold clamping force as the reaction force, it is easy to move and rotate the female rod with the male rod fixed. The locking and mold clamping can be performed.
In particular, in the invention according to claim 2, in addition to the above-mentioned effect, when the mold thickness of the split mold is changed, the male side rod and the female side according to the changed size. Both rods are adjusted in the axial direction, and the position where the female and male hooks provided at the tip of each pair of rods are fitted is always located on the mold matching surface, and the mold alignment is performed when the mold is opened. The tip of the male side rod and the female side rod can be positioned in the vicinity of the open space of the split mold at a symmetrical position from the surface, and the versatility of the lock clamping mechanism is enhanced. When the molded product is taken out after being opened, the lock clamping mechanism does not get in the way, and the insert part can be loaded into the mold and the molded product can be taken out smoothly without any trouble.
The apparatus invention according to claims 3 to 6 can implement the method according to claim 1 and exert its effects.
In particular, the device invention according to the fourth, sixth, seventh, eighth, and ninth aspects can appropriately implement the method invention according to the second aspect and exhibit its effects.

Next, typical embodiments of the device invention according to claims 3 to 9 will be described.
In FIG. 1, 10 shows the whole mold clamping apparatus in a blow molding machine.
The mold clamping device 10 is supported by a pair of left and right gantry 12 guided so as to be able to approach and separate from a rail 11 laid on a base, and a vertical plate of the gantry 12 movably in a mold opening / closing direction. When the pair of mold plates 13, the divided molds 40 attached to the respective mold plates, and the base plate 13 together with the base 12 are closed, the base 12 is closed. A lock mold clamping mechanism 30 is provided for locking and clamping so as not to move in the mold opening direction.
The lock-type clamping mechanism 30 includes a pair of horizontal female-side swan base-type engaging portions 32 and a rod 33 having a male detachable engaging portion 31 having a diametrical protrusion engaged therewith at the tip, At least four sets (see FIGS. 5, 6 and 7) of 34 are provided in the mold plate 13, and the male rod 33 is one of the pair of horizontal pairs of rods 33, 34 of each set. 13 is arranged so that it can move forward and backward by a predetermined stroke by a hydraulic cylinder device 41 in its axial direction (see FIGS. 1, 2, and 3). That is, the male side rod 33 is provided so as to be able to advance and retreat in the axial direction with respect to the male side template 13, and the piston rod that slides with the hydraulic cylinder of the hydraulic cylinder device 41 fixed to the template 13 is the male rod. A side rod 33 is provided. Therefore, if the male side rod 33 is pulled, the male side template 13 integrated with the hydraulic cylinder of the hydraulic cylinder device 41 is moved in the direction of the female side template 13, and the two divided dies 40 are brought into pressure contact with each other.

  On the other template 13, the female rod 34 can move forward and backward by a predetermined dimension in the axial direction, and when the female side engaging portion 32 is fitted into the male side engaging portion 31, the female and male engaging portions are engaged. The portions 31 and 32 are arranged so as to be capable of rotating 90 degrees forward and backward around this axis so as to be engaged with each other and integrally connected.

  The rods 33 and 34 having at least one pair of four female and male detachable engaging portions 31 and 32 at their tips can be moved in the same dimension in the same axial direction in synchronism by a synchronizing device.

More specifically, a male screw 35 is formed on the outer peripheral surface of the female rod 34, and a nut 36 screwed to the male screw 35 is used for adjusting the movement of the female rod 34 in the axial direction. When the female rod 34 is engaged with each other by the rotation of the female rod 34 around this axis, the hooks 31 and 32 are engaged with each other. The nut 36 is disposed so as not to rotate with respect to the template 13.
An endless transmission chain 37 is wound around the driven sprocket integral with the nut 36 provided on the female rod 34 and the drive sprocket provided rotatably on the template 13. A device that mechanically rotates, moves the endless transmission chain 37, and simultaneously rotates the nut 36 constitutes the synchronizing device (see FIGS. 2 and 4).
An air cylinder device 38 is connected to each of the female side rods 34 via a link mechanism 39, and the air cylinder device 38 rotates the female side rod 34 forward and backward 90 degrees around its axis. (See FIGS. 2, 4, 5, 6, and 7).

More specifically, the air cylinder device 38 that rotates the pair of female-side rods 34 forward and backward by 90 ° is fixed to the template 13. The piston rod 50 of the air cylinder device 38 is horizontal and extends at right angles to the longitudinal axis of the female-side rod 34, and can reciprocate by a predetermined stroke.
Connected to the tip of each piston rod 50 is the link mechanism 39 comprising a bell crank 51 and a ring body 52 that is integral with the bell crank 51 and is arranged concentrically with the female rod 34. The ring body 52 is engaged with the female rod 34 by a key 54 that is slidably engaged along a key groove (not shown) formed in the female rod 34. It is arranged so as to be able to rotate 90 ° around the longitudinal axis of the rod 34 (see FIG. 7).
The ring body 52 is held in a non-displaceable manner in the longitudinal axis direction of each female-side rod by a support arm that extends horizontally at right angles to the longitudinal axis of the female-side rod and is provided on the template 13. (See FIGS. 4 and 7). More specifically, the support arm has a pair of engaging jaws, and the pair of engaging jaws are spaced apart from each other in the longitudinal axis direction of the female-side rod, and the ring is formed on the inner edge of each engaging jaw. A part of the outer edge of the body 52 comes into contact, and the ring body 52 cannot be displaced in the longitudinal axis direction (see FIG. 7).

The operation of the embodiment having the above-described configuration will be described below together with a typical embodiment of the method invention according to claims 1 to 2.
The mold plate 13 is locked by the lock mold clamping mechanism 30 so as not to move in the mold opening direction at the mold clamping start position, and a force is applied to the engaging portions 31 and 32 in a direction away from each other. The split molds 40 attached to the mold plate 13 are clamped by pressure-contacting 40.

  That is, when the mold plate 13 is locked and clamped by the lock mold clamping mechanism 30 so as not to move in the mold opening direction at the mold clamping start position, at least one to four pairs provided in the lock mold clamping mechanism 30 are provided. The rods 33 and 34 having the female and male detachable engaging portions 31 and 32 at the tips thereof are brought close to each other in the axial direction, and the female and male engaging portions 31 provided at the tips of the pair of rods 33 and 34 of each pair. 32, and then the female rod 34 is rotated about its axis, and the female engagement portion 32 is mutually engaged with the male engagement portion 31 to be connected together and clamped. To do.

  When the mold thickness of the split mold 40 is changed (see FIGS. 2 and 3), the male-side rod 33 and the female-side rod 34 are moved in the axial direction according to the changed dimensions. The position where the female and male engaging portions 31 and 32 provided at the ends of the pair of rods of the respective pairs are fitted is always located on the die-matching surface, and the position is symmetrical from the die-matching surface when the die is opened. Then, the tips of the male-side rod 33 and the female-side rod 34 are positioned in the vicinity of the open space of the split mold 40. FIG. 2 shows a case where the mold thickness is 500 mm, and FIG. 3 shows a case where the mold thickness is 400 mm.

It is a front view which shows the outline of this mold clamping apparatus. It is a general | schematic enlarged front view which shows the lock clamping mechanism of FIG. It is a general | schematic expanded front view similar to FIG. 2 which shows adjustment of the said rod when a mold thickness changes. FIG. 3 is a schematic side view of FIG. 2. It is the schematic which shows the state by which the engaging part was fitted. It is the schematic which shows the state which the latching part engaged and connected. FIG. 2 is a partially enlarged view of FIG. 1. It is the schematic of the conventional lock type clamping mechanism.

Explanation of symbols

30 Lock type clamping mechanism 31, 32 Engagement part 33, 34 Rod

Claims (10)

The pair of left and right mounts are moved in the mold closing direction, the split molds attached to the pair of mold plates supported by the vertical plates of the mount are moved, and the molds are closed. In the method of locking so as not to move in the mold opening direction, and then performing mold clamping by applying a mold clamping force to the split mold by the lock mold clamping mechanism,
In the lock mold clamping mechanism provided at the top and bottom of the template, at least one pair of females and a rod having a male and female detachable engaging portion at the tip are brought close to each other in the axial direction, and each pair of pairs After fitting the female and male hooks on the rod end of the rod, rotate the female rod around its axis and engage the female hook with the male hook. Then, the male rod is moved away from the female rod, and the mold clamping force is generated as the reaction force. When the mold is opened, the engagement portion is removed, and the rods are separated and retracted. A mold clamping method, wherein the rod tip position is positioned in the vicinity of an open space between divided molds formed by mold opening.   When the mold thickness of the split mold is changed, the male-side rod and the female-side rod are both adjusted in the axial direction according to the changed dimensions, and the pair of each pair The position where the female and male hooks provided at the rod tip are fitted together is always located on the mold-matching surface, and the male side is located near the open space of the split mold at a symmetrical position from the mold-matching surface when the mold is opened. 2. The mold clamping method according to claim 1, wherein the tip of said rod and the tip of said female side rod are positioned. A pair of left and right gantry guided so as to be able to approach and separate from the rails laid on the base, a pair of stencils supported on the vertical plate of the gantry so as to be movable in the mold opening / closing direction, and the template And a lock for locking the mold so that the mounts do not move in the mold opening direction when the split mold is closed by bringing the mold plate close together with the mount. In a mold clamping device in a synthetic resin molding machine equipped with a mold clamping mechanism,
The lock mold clamping mechanism includes at least four pairs of rods having at least one horizontal pair female and a male engaging / disengaging engagement portion at the top and bottom of the mold plate, and the male side of the pair of horizontal pairs of rods. The rod is connected to a linear drive device so that it can move forward and backward by a predetermined stroke in the axial direction with respect to one mold plate, and the rod on the female side moves forward and backward in the axial direction on the other mold plate. It is possible, and when the female-side engaging part is fitted into the male-side engaging part, the female-male engaging part engages with each other so that it can be rotated forward and backward around this axis so as to be connected together. The male rod is capable of moving back and forth in the axial direction with respect to the male template, and the male rod is based on the male template and has a tensile force. The Mold clamping apparatus in the synthetic resin molding machine, characterized in that raw to mechanism is provided. 4. The rod having at least one pair of four pairs of female-side detachable engaging portions at the tip thereof can be moved in the same dimension along the axial direction in synchronism with a synchronizing device. A mold clamping device in the described synthetic resin molding machine.   5. The mold clamping device in a synthetic resin molding machine according to claim 3, wherein the synthetic resin molding machine is a blow molding machine. A male screw is formed on the outer peripheral surface of the female-side rod, and a nut screwed into the male screw is not movable in the thickness direction with respect to the template when adjusting the movement of the female-side rod in the axial direction. When the female rod is engaged with each other by the rotation of the rod on the female side around the axis, the nut is attached to the template. 6. The mold clamping device in a synthetic resin molding machine according to claim 3, wherein the mold clamping device is arranged so as not to rotate.   An endless transmission chain is wound around the sprocket integrated with the nut provided on the rod on the female side and the drive sprocket provided rotatably on the template, and the drive sprocket is rotated manually or mechanically. 7. A mold clamping device in a synthetic resin molding machine according to claim 4, 5 or 6, wherein a device for moving the endless transmission chain and rotating the nuts at the same time constitutes the synchronizing device.   The linear drive device that rotates the pair of female-side rods forward and backward by 90 ° is fixed to the template as an air cylinder device, and the piston rod of the air cylinder device is horizontal and is fixed to the female-side rod. It extends at a right angle to the longitudinal axis and can reciprocate by a predetermined stroke. At the tip of each piston rod, it is arranged concentrically with the bell crank and the rod on the female side integrally with the bell crank. The link mechanism comprising a ring body is coupled, and the ring body is engaged with the female rod by a key that is slidably engaged along a key groove formed in the female rod, 8. The mold clamping device in a synthetic resin molding machine according to claim 4, wherein the mold clamping device is arranged so as to be capable of rotating by 90 [deg.] Around the longitudinal axis of the rod on the female side.   The ring body is held in a non-displaceable manner in the longitudinal axis direction of each female side rod by a support arm that extends horizontally at right angles to the longitudinal axis of the female side rod and is provided on the template. A mold clamping device in a synthetic resin molding machine according to claim 8. The support arm has a pair of engaging jaws, and the pair of engaging jaws are spaced apart from each other in the longitudinal axis direction of the female-side rod, and the inner edge of each engaging jaw has an outer edge of the ring body. 10. The mold clamping device in a synthetic resin molding machine according to claim 9, wherein a part of the ring body is in contact and the ring body is not displaceable in the longitudinal axis direction.

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