Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/56—Opening, closing or clamping means
  • B29C49/5607—Electrically operated, e.g. the closing or opening is done with an electrical motor direct drive
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/56—Opening, closing or clamping means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/56—Opening, closing or clamping means
  • B29C2049/566—Locking means
  • B29C2049/5661—Mechanical
  • B29C2049/5662—Latch
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C2949/00—Indexing scheme relating to blow-moulding
  • B29C2949/07—Preforms or parisons characterised by their configuration
  • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
  • B29C49/04—Extrusion blow-moulding
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
  • B29C49/06—Injection blow-moulding

Definitions

• the present invention relates to a hollow molding apparatus and a hollow molding method provided with a mold clamping device that reliably performs mold clamping by expressing a high-speed opening / closing operation of a molding die and a high mold clamping force.
• a hollow forming apparatus generally includes a cylinder head made of a thermoplastic resin discharged from a crosshead die of an extruder and introduced into a molding die and inserted into a molding die to blow compressed air into the cavity.
• An air blowing nozzle provided in the apparatus is inserted, air is blown through the air blowing nozzle, and a parison is formed into a hollow molded article by a cavity engraved on the inner surface of the molding die.
• Patent Documents 1 and 2 As conventional hollow molding machines, for example, those described in Patent Documents 1 and 2 below have been proposed as those equipped with a mold clamping device that exhibits high mold clamping force.
• a slide base 330 on which a guide rail 331 fixedly installed on a main body base 301 is installed and a guide rail 331 is slidably mounted.
• Movable base 332 provided, three tie bars 333, 334, and 35 passing through the movable base, front platen support plate 336 and rear support plate 337 fixed to these tie bars, and slide on the tie bars
• a pair of platens 340 and 345 connected to slide collars 342, 343, 346 and 347 that are threaded through and having forming molds 341 and 344 attached, and the pair of platens 340 and 345 are equidistantly spaced from each other.
• Parting line PL to be moved and held by the holding mechanism 352, and a clamping drive mechanism 356 and a clamping generation mechanism 362 that cause a pair of opposing molds to perform a mold closing 'pressure holding' mold opening action Yes.
• the parting line holding mechanism 352 has a pair of racks 349, 350 extending horizontally with supports on the slide collars 342, 343, 346, 347 of the front platen 340 and the rear platen 345, respectively.
• a pair of racks 349 and 350 are provided facing each other and engaged with the pinion 351 rotatably supported on the movable base 332.
• the clamping drive mechanism 356 is a toggle link mechanism that converts rotational motion into linear motion, and is interposed between and connected to the rear platen 345 and the rear support plate 337, and is electrically connected to the drive shaft 358.
• a clamping force generation mechanism 362 slidably couples a shaft 365 to the other end of the link arm 361 via a bracket 364 in the same direction as mold opening / closing of a molding die, and a shaft 365 Is axially movably inserted into a cylinder 366 provided at the upper end of the rear support plate 337, and in the cylinder 366, a plurality of disc springs 367 penetrating the shaft 365 are arranged with their concave surfaces facing each other in a compressible manner. ⁇ Contained and configured.
• the toggle mechanism 409 is a mechanism for converting the toggle piece into a bent straight line, and is interposed between the first mold holder 410 and the moving plate 418, and the toggle mechanism 409 A pair of first and second toggle pieces 407 and 408 are bendably coupled, and a pair of first and second toggle pieces 407 and 480 are bendably coupled by a support shaft 411.
• the second toggle tab 408 is pivotally coupled to the movable plate 418 via the second bracket 408a! .
• the guide block 412 fixed to the support shaft 411 is vertically guided by a pair of center positioning guide bars (not shown) fixed to the support portion 431 of the movable table 430, and a pair of toggle pieces 407 , 408 can be moved in a bent or straight shape, the mold 401 can be opened in a bent shape, and the mold 401 can be closed in an extended straight shape. That is, a motor screw 415 fixed to the movable base 430 and capable of forward and reverse drive is used to connect a ball screw or the like through the coupling 415a. By turning the feed screw 416 forwardly and reversely, the guide block 4 12 screwed with the feed screw 416 reciprocates in the central axis direction of the guide bar.
• the mold clamp changer 420 is indirectly connected to the second mold section 403 through the rods 419a and 419b, the connector 421 and the second mold holder 417, and the toggle mechanism 409 and the gold are changed.
• the mold clamp changer 420 includes a guide member 440 fixed to a moving plate 418 integrally moving with the second mold portion 403, and an adjustment screw member (not shown) fixed to a second bracket 408a. It has a worm and a worm wheel, and an electric motor 444 also serving as a servomotor capable of forward and reverse driving.
• Patent Document 1 Japanese Patent Application Laid-Open No. 7-32366
• Patent Document 2 Japanese Patent Application Laid-Open No. 2004-106284
• Patent Documents 1 and 2 describe that the mold closing operation of the molding die and the operation for generating the mold clamping are performed by one toggle mechanism, and the rotational motion is linear. Because it converts motion or bending into linear motion, it can not open and close the mold at high speed. Also, due to the position relationship between the support point of the mold clamping force and the point of application of the mold clamping force, the mold clamping force of the molding die may cause deflection on the platen and may not be directly transmitted to the molding die immediately.
• the present invention is intended to solve the problems that such a conventional hollow molding apparatus had, and the high-speed opening and closing operation of the molding die and the high mold clamping force are realized to ensure the mold clamping. It is an object of the present invention to provide a hollow molding apparatus and a hollow molding method equipped with a mold clamping device capable of performing the
• the present invention provides a mold clamping device in a hollow molding apparatus that performs mold opening, mold closing and mold clamping of a pair of split molds forming a molding mold, the pair of split molds.
• An advancing and retracting mechanism for bringing the bases to be supported close to each other, a first locking member provided on both sides of one of the bases of the pair of bases, and a corresponding first locking member provided on both sides of the other base
• a second locking member for engaging / disengaging, the first locking member and the second locking member
• a mold clamping drive mechanism which pulls and drives the first locking member and the second locking member engaged at the time of mold closing by bringing them close to each other in a direction in which the pair of split molds are clamped. It is a hollow molding device equipped.
• the second problem solution means is configured such that the mold clamping device has a mechanism for driving the engagement / disengagement of the first locking member and the second locking member. .
• a third problem solving means in the engagement / disengagement drive mechanism, one of the first locking member and the second locking member is pivotally supported and the locking member is supported.
• a support that advances and retracts in synchronization with the operation of the mold clamping drive mechanism with respect to the other locking member of the first locking member and the second locking member, and the above-described in accordance with the movement of the support.
• a guide body for guiding one locking member in a direction in which the other locking member is engaged and separated.
• a fourth problem solving means is that the engagement / disengagement drive mechanism comprises a cylinder, and the engagement and disengagement of the first and second engagement members is synchronized with the movement of the cylinder axis of the cylinder. It is configured to carry out joint departure.
• a fifth problem solution means is a left and right reverse lead feed screw for causing the advancing and retracting mechanism to synchronize the pair of split molds with each other, and an electric motor for rotationally driving the left and right reverse lead feed screw. It is set as having composition. As a motor, a servomotor is preferable from the viewpoint of control.
• a sixth means for solving problems comprises a feed screw for causing the clamping drive mechanism to move the first locking member and the second locking member closer to and away from each other, and a motor for rotationally driving the feed screw.
• the configuration is as follows.
• the servomotor is preferable for the surface tension of control.
• a seventh means for solving the problem is to provide a plurality of molding dies provided side by side, and a mold clamping device for opening, closing and clamping a pair of split molds forming the molding dies.
• a mold is provided for each mold, the molding mold and the corresponding mold clamping device are provided movable in the direction in which the plurality of molding molds are arranged, and the molding mold and the corresponding mold clamping device are provided.
• An advancing / retracting mechanism which is provided movably in a direction orthogonal to the arranging direction of molding dies, and each of the plurality of mold clamping devices moves the base for supporting the pair of split molds close to each other.
• a first locking member provided on both sides of one base of the pair of bases, and a second locking member provided on both sides of the other base for engaging and disengaging with the corresponding first locking member The first locking member and the second locking member are moved close to each other, and the first locking member and the second locking member engaged at the time of mold closing are used to clamp the pair of split molds. And a clamping drive mechanism for pulling and driving in the direction of movement.
• the mold clamping apparatus those of the above-described second to sixth problem solving means can be used as the mold clamping apparatus.
• a parison is accommodated in a pair of split dies forming a molding die and closed, and a first locking member provided on both sides of one of the split dies and the other are provided.
• the second locking member provided on both sides of the split mold is engaged, and while engaging the locking members, the pair of split molds are pulled in a direction to clamp the mold, and the clamping force reaches a desired value. Then, the tension in the mold clamping direction is stopped and compressed gas is blown into the parison while holding the desired mold clamp, and the mold clamp is released after exhaust of the blowing gas after the completion of the blow is completed.
• the first locking member and the second locking member are separated from each other, and the mold is opened.
• tension in a direction to clamp the pair of split molds is achieved by a driving force of the motor, and the brake is applied to the motor when the clamping force reaches a desired value.
• the torque value to be applied to the motor is lowered to a desired value while holding the mold clamping force, the torque value is restored after blowing is complete, and the mold clamping force is released after exhaustion of the blowing gas is complete.
• the reduction of the torque value is not particularly limited as long as it can achieve the power saving of the motor, but it is desirable to reduce the 90% fluctuation which can achieve the power saving while maintaining the desired mold clamping force. Better ,.
• the action of the first problem solving means is as follows. That is, at the time of mold clamping, the pair of split molds are brought close to each other by driving the advancing and retracting mechanism, and then the mold clamping is performed, and then the mold clamping drive mechanism is driven after the first locking member and the second locking member are engaged. Since the first locking member and the second locking member are engaged and the pair of split molds are clamped while being engaged, high-speed opening / closing operation of the molding die and high mold clamping force can be realized, and the molds can be reliably made. You can do this.
• the mold clamping drive mechanism On the other hand, releasing the mold clamping force and opening the mold drive the mold clamping drive mechanism to move the first locking member and the second locking member to the disengagement position, and the first locking member and the second locking member are released. Disengage from the locking member. After the separation, the advancing and retracting mechanism is driven to separate the pair of split molds.
• the action of the second problem solution means is to engage the first locking member and the second locking member which are separated by driving the engagement / disengagement drive mechanism after the mold is closed. After engagement, the mold clamping drive mechanism is driven to engage the first locking member and the second locking member to clamp the bow I-clamping pair split mold, so In addition to being able to express high-speed opening and closing movements of the mold and high mold clamping, it is possible to perform clamping reliably.
• the engagement and separation drive The mechanism is driven to separate the first locking member and the second locking member. After the separation, the advancing and retracting mechanism is driven to separate the pair of split molds.
• the action of the third problem solving means causes the clamping drive mechanism to synchronously move the back and forth movement of the support, thereby eliminating the need for an additional drive mechanism for the support and simplifying the apparatus. If it is possible, it produces an effect.
• the action by the fourth problem solution means synchronizes the engagement / disengagement drive mechanism with the advancing / retracting of the cylinder axis of the cylinder to make the engagement / disengagement position of the first locking member and the second locking member Since it was decided to change and adjust easily, when changing the molding die according to the product to be hollow-molded, the mold thickness of the pair of split dies constituting the molding die should be changed according to the product. Even if it is hot, it is possible to absorb the mold thickness change of the split mold by changing and adjusting the position of the engagement of the first locking member and the second locking member, the engagement of the separating drive mechanism, and the separating. It produces an effect of being able to
• the left and right reverse lead feed screw and the motor for driving the same can make the pair of split types close-to-separate, that is, close and release the mold and open at high speed easily and easily. Play an effect.
• the action of the sixth solution means can adjust the torque of the feed screw and the motor that drives it to easily change the clamping force.
• the first locking member and the second locking member move close to each other, that is, at the time of mold clamping and mold clamping release, even if the mold thickness changes, the position adjustment of these members can be easily and easily performed. Play.
• the action of the seventh problem solving means enables rationally arranging a plurality of mold clamping devices and performing efficient hollow molding, and in addition to being equipped with a plurality of mold clamping devices, it is possible to use hollow molds.
• the molding device itself becomes relatively compact, and the installation space of the hollow device itself is reduced. You can do it!
• the action of the eighth problem solving means stops pulling operation while holding a desired mold clamping force, so that no excessive force is applied to the mold, extending the life of the mold. Further, the power saving of the drive source can be achieved.
• the action of the ninth problem solving means is that, when the mold clamping force reaches a desired value, the tension value in the mold clamping direction is stopped and the torque value of the motor is reduced to the desired value while holding the mold clamp.
• the power saving of the motor can be achieved.
• the hollow molding apparatus and the hollow molding method of the present invention high mold clamping force can be developed to perform mold clamping reliably.
• the engagement and separation may occur.
• the engagement portion according to the mold thickness by the drive mechanism, the engagement / disengagement between the first locking member and the second locking member can be performed without any problem.
• FIG. 1 is a perspective view showing a mold clamping device of a hollow forming machine according to a first embodiment of the present invention.
• FIG. 2 A side view showing the clamping device shown in FIG. 1 before clamping.
• FIG. 3 A side view showing the clamping device shown in FIG. 1 after clamping.
• FIG. 4 is a partially cutaway view of the mold clamping device shown in FIG.
• FIG. 5 is a perspective view showing the hollow molding machine of the embodiment.
• FIG. 6 is a side view showing the hollow molding machine shown in FIG.
• FIG. 7 A front view showing the hollow molding machine shown in FIG. 5. [FIG.
• FIG. 8 is a process flow diagram showing a hollow molding method according to a second embodiment of the present invention.
• FIG. 9 is a perspective view showing a hollow molding machine according to a third embodiment of the present invention.
• FIG. 10 is a side view of the hollow molding machine shown in FIG.
• FIG. 11 A front view of the hollow molding machine shown in FIG.
• FIG. 12 is a plan view of the hollow molding machine shown in FIG.
• FIG. 13 A perspective view showing a mold clamping device shown in FIG.
• FIG. 14 is a side view showing the clamping device shown in FIG. 13 before clamping.
• FIG. 15 A side view showing the clamping device shown in FIG. 13 after clamping.
• FIG. 16 is a front view of a hollow molding apparatus showing a fourth embodiment of the present invention.
• FIG. 17 is a perspective view showing a mold clamping device of the hollow molding apparatus shown in FIG. 16;
• FIG. 18 is a front view with a part of the clamping device cut away.
• FIG. 19 is a front view with a part of the mold clamping device shown in FIG. 18 cut away.
• FIG. 20 is a front view showing a clamping state by the clamping device shown in FIG. 18;
• FIG. 21 is a process flow diagram showing a hollow molding method according to a fifth embodiment of the present invention.
• FIG. 22 is a front view showing a conventional mold clamping device.
• FIG. 23 is a front view showing another aspect of the conventional mold clamping device.
• the mold clamping device 10 in the hollow molding apparatus according to the first embodiment of the present invention has rails disposed at predetermined intervals in the horizontal direction. 11 and a front mold 21 and a rear mold 22 which are slidably mounted and opposed to the rail 11 with a predetermined distance, and a molding die held relative to the pair of platens 21 and 22.
• a left and right reverse lead ball screw 4 which penetrates the pair of platens 21 and 22 so as to mutually synchronize and move the platens toward each other toward the patterning line PLI, and the pair of platens 21 and 22 At least one of the front convex locking members 51, 51 and the rear concave locking members 52, 52 provided on opposite sides and on the left and right sides, and the respective locking members 51, 51, 52, 52 Of the two locking parts 5 and 5 by moving the locking member of the The ball screw 6 for the engaging portion connected to the plurality of concave locking members 52, 52, which enables the engaging portions 5 and 5 of the rear portion 5 and 5, and the left and right reverse lead ball screw 4 located on the back side of the rear platen 22. It comprises a connected platen moving motor 7 and a clamping force generating motor 8 connected to an engaging portion ball screw 6 located on the back side of the rear platen 22.
• the rails 11 are fixedly laid on the top surface of the frame-like gantry 1 with a predetermined gap so that the front platen 21 and the rear platen 22 can slide. ing.
• the rail 11 is a guide for sliding and moving the pair of platens 21 and 22 with respect to the mount. That is, in the figure, the guide rail is a linear guide bearing formed by interposing a movable body having a rolling portion in which the bearing is endlessly connected. However, other than this, a simple guide rail may be used, and a track of a strong member which is a substitute for a gantry may be necessary. A pair of guide rails mounted on this track with a predetermined distance may be used. If it can be moved or moved on the platen cover,.
• the frame 1 is not limited to a frame shape, and may be a flat plate, or if a strong rail is used, the frame portion in the sliding movement direction of the platens 21 and 22 is Rails may be substituted. The point is that the platen should stand up to the rail and be movable toward the predetermined parting line PLI by the operation of the left and right reverse screws.
• the front platen 21 is slidably attached to the rail 11 via a slide member having a built-in bearing, in a frame-like manner with a flat plate being hollowed out.
• Convex locking members 51 and 51 are disposed on both sides of the front platen 21.
• the rear platen 22 is slidably attached to the rail 11 via a slide member having a built-in bearing in a frame-like manner with a flat plate removed.
• concave locking members 52, 52 on the rear platen side are disposed at positions matching the convex locking members 51, 51 on the front platen 21 side.
• a front split mold 3 a and a rear split mold 3 b forming the molding die 3 are attached to the front platen 21 and the rear platen 22 in a facing state.
• 9 is a flash sensor, which means that the front platen 21 and the rear platen 22 are in a predetermined proximity position, in other words, the contact surfaces of the front split mold 3a and the rear split mold 3b It is adjusted and placed in the contact position, and is used to sense that the pair of split molds 3a and 3b has come into contact normally without interposing excess resin (burr) and other foreign matter.
• the left and right reverse lead ball screw 4 is inserted into the front platen 21 and the rear platen 22 so that the front platen 21 and the rear platen 22 can move toward the predetermined parting line PLI in synchronization with each other. It is.
• the left and right reverse lead ball screw 4 has a reference portion (partially threaded portion) 4s substantially at the center, and a forward screw 4a is screwed toward one end toward the other end, and a reverse screw 4b toward the other end.
• the screw is referred to as a screwed left and right reverse lead open / close ball screw, and in FIG. 1, the forward screw 4a is a front plate. Screwed on a forward screw nut (not shown) provided on the rear cover 21 and screwed on a reverse screw nut 33 provided on the rear platen 22 so that the platens 21 and 22 move close to each other according to the rotation direction of those screws. It moves in the opposite direction.
• the end 4 c on the right side of the ball screw is rotatably supported by a bearing in a support 31 of the gantry 1.
• the left end 4 d is rotatably mounted by a thrust bearing 34 mounted on a motor mount 32, and is coupled with a platen moving motor 7 by a coupling 35.
• the left and right reverse lead ball screw 4 and the motor 7 constitute an advancing and retracting mechanism 20.
• the left and right reverse lead ball screws 4 are additionally disposed one at the back of the figure, Both may be synchronized and rotated.
• the platen moving motor 7 is a servomotor, which rotates the lead ball screw 4 reversely by the drive rotation to move the front platen 21 and the rear platen 22, in other words, a pair of split molds 3 a, Synchronize 3b with each other and approach to a predetermined parting line PLI.
• Proximity ⁇ Separation ⁇ ⁇ 3 ⁇ 4 It is a round.
• the two sets of engaging portions 5 and 5 consisting of a pair of uneven locking members 51 and 52 are split molds 3 a and 2 a by the movement of the pair of platens 21 and 22 by the operation of the left and right reverse lead ball screw 4.
• the front split mold 3a is brought into contact with the split mold 3b by bringing them into contact with each other and pulling the front split mold 3a toward the rear split mold 3b or the contact split surfaces are brought into contact with each other.
• the contact surface of the front split mold 3a is brought into pressure contact with the contact surface of the rear split mold 3b to generate a mold clamp.
• the left and right concave locking members 52, 52 respectively have a single supporting plate 53, 53 which forms a steel plate, nuts 54, 54 attached to these supporting bodies, and these nuts
• a drive pulley 63 formed by winding a venolet 62 at 61, and a built-in brake force generating motor 8 which is a servomotor having a motor output shaft attached to the drive pulley 63 are connected.
• Each concave locking member 52 comprises a first locking arm 52a and a second locking arm 52b, and each arm forms a groove 52c at its base and inserts the tip of the support 53. , Are rotatably supported by pins 56, 57.
• the left and right supports 53 and the concave locking member 52 are disposed in a guide 58 including an inner U-shaped steel plate 58a and an outer flat steel plate 58b. In FIG. 4, in the left guide body 58, the outer flat steel plate is omitted for the sake of explanation.
• An upper guide wall 58c and a lower guide wall 58d form a diverging space toward the tip of the guide body 58, and the tips of the concave locking member 52 and the support 53 are located in this space. Furthermore, a pin 59 erected on the outer flat steel plate (not shown) is inserted into an elongated hole 52d formed in each of the first locking arm 52a and the second locking arm 52b, and the first locking arm 52a
• the second locking arm 52b opens and closes by sliding the pin 59 in the elongated hole 52d with the pins 56 and 57 as a fulcrum following the movement of the support 53 back and forth.
• the concave locking member 52 engages and disengages the convex locking member 51.
• the support 53, the pin 56, the pin 57, the guide 58, the pin 59, and the long hole 52d of the concave locking member constitute an engagement / disengagement drive mechanism 30.
• the drive unit 60 is provided at the end portions of the convex locking members 51, 51.
• the driving portion 60 is for causing the projecting locking members 51 and 51 not projecting from the contact (mold) surface of the molding die to project when forming the engaging portions 5 and 5.
• these locking members are not limited to those in which the convex locking members are gripped by the concave locking members.
• they may be in the form of wedges, grooves or concavo-convex surfaces that both grip each other. It is possible to provide the selected drive unit according to this, even if they are mutually engaged by rotation.
• a convex locking member is provided on the rear platen side, and a concave locking member is provided on the front platen side, and according to this, a drive unit that becomes a pulley, a belt or a motor is provided on the rear platen side. May be provided. Furthermore, it is possible to arrange a plurality of motors alone without using pulleys or belts and to use them in synchronization.
• the hollow molding machine 70 equipped with the above-described mold clamping device 10 is, as shown in FIGS. 5 to 7, an extruder having a crosshead die 71 for melting and discharging a parison P made of thermoplastic resin. 72, the mold clamping device 10 having the front platen 21 and the rear platen 22 mounted to each other, and the parison P held by the pair of platens 21 and 22 introduced to the mold mold 3 for holding the mold
• the Parison cutting device (not shown) for cutting the upper end of the Norrison P, the air blowing unit 74 provided with the air blowing nozzle 73 inserted into the Norison P, and the parison P are introduced and held.
• the molding die 3 is moved by the mold moving device (not shown) for moving the molding die 3 directly below the cross head die 71 directly below the air blowing nozzle 73, and the molding die 3 in the mold open state is the cross head die 71.
• Norison P is blow molded into a hollow molded article.
• the extruder 72 is a raw material charging hopper 75 for charging a thermoplastic resin, a barrel for melting and softening the thermoplastic resin, and a tubular parison P for melting the thermoplastic resin at the tip end. It has a crosshead die 71 for discharging, and a control mechanism for controlling the thickness and length of the cylindrical parison P and the like.
• the Nollison cutting device melts and discharges the tubular parison P discharged from the crosshead die 71 for multiple heads of the extruder into the molding die 3 in the mold open state and clamps it, The mold 3 is closed to close the lower end of the discharged cylindrical parison P, and the upper end of the discharged cylindrical parison P is cut to make a predetermined length Noson P.
• a hot-cutter system consisting of a cutter holder with an electrothermal cutter at its tip and a drive mechanism for the cutter holder, which reciprocates the electrothermal cutter and cuts off the cylindrical parison discharged by the electrothermal cutter.
• the air blowing device 74 is mounted on a frame fixed to the base 76, has an air blowing nozzle 73, and is disposed adjacent to the crosshead die 71.
• the air blowing nozzle 73 comprises a nozzle driving motor 77, which is a servomotor mounted on the air blowing nozzle 73 via an operating body connected to the air blowing nozzle 73, and a control mechanism (not shown) such as an electric circuit for controlling these.
• the motor for driving the nozzle 77 is driven by the function of the control mechanism to lower the air blowing nozzle 73 downward.
• the control motor operates the nozzle drive motor 77 to move the air blowing nozzle 73 upward.
• air is also supplied to the air blowing nozzle as its source power!
• the clamping device 10 is a slide rail 78 on the base 76 at a position below the extruder 72.
• the mold 3 is disposed so that the opening and closing directions thereof are aligned with the axial direction of the extruder 72, and the opening of the molding die 3 is directed to the crosshead die 71 side.
• the rail 11 is disposed in the form of being mounted on a frame body in the longitudinal direction of a frame (frame) shaped frame 1 on a slide rail 78 on a base 76.
• a ball screw 79 driven by an electric motor (not shown) that also serves as a servomotor force for moving the rack 1 is disposed below the rack 1, and the rack 1 is a ball nut of the ball screw 79.
• the ball screw 79 is movably provided in the axial direction of the ball screw 79 via a slide rail 78 disposed on the base 76.
• the mold moving device transfers the tubular parison P melted and discharged from the crosshead die 71 to a position below the air blowing device 74 equipped with the air blowing nozzle 73 to blow air into the parison P.
• the table 1 on which the mold clamping device 10 on which the mold 3 is attached via the platens 21 and 22 is mounted on the slide rail 78 disposed on the base 76 is slid and transferred.
• the mold clamping device 10, which is movably mounted and on which the molding die 3 is mounted, is mounted on the slide rail 78 disposed on the base 76 together with the gantry 1, the lower position of the crosshead die 71 and the air. It is made to reciprocate at the lower position of the blowing nozzle 73.
• the slide rail 78 may have a structure similar to that of the linear guide bearing disposed in the clamping device 10.
• a raw material resin such as polyethylene, polypropylene or polyethylene terephthalate is supplied to a raw material feeding hopper 75 provided in the extruder 72, and the raw resin is melted and softened in the barrel of the extruder 72.
• the tubular parison P is extruded and dropped through the crosshead die 71, and the tubular parison P is stored in the cavities 3c and 3d of the mold 3 in the mold open state.
• the mold clamping device 10 is driven to close the molds of the front split mold 3a and the rear split mold 3b to close the lower end of the cylindrical parison P, and the upper end is parison
• the pair of split molds 3a and 3b are moved immediately below the air blowing device 74.
• the air blowing nozzle 73 of the air blowing device 74 is inserted into the cylindrical parison P, whereby the cutting sleeve at the tip of the air blowing nozzle 73 and the counter plate at the upper part of the molding die are At the same time, the excess resin (upper burr) at the top of the cylindrical parison P is cut to form the mouth of the hollow molded product, and air is blown into the cylindrical parison P from the air blowing nozzle 73.
• the tubular parison P is molded into a hollow molded article (not shown).
• the molded hollow molded product is supported by the air blowing nozzle 73, and the mold clamping device 10 slides and moves with the molding die 3 opened, and is positioned directly below the crosshead die 71 and mold closed.
• the hollow molded product supported by the air blowing nozzle 73 is gripped by a product holder (not shown) mounted on the side of the platen, and after the air blowing nozzle 73 rises, a new cylindrical parison is obtained.
• the clamping device 10 in which P is housed in the molding die 3 is moved to a position immediately below the air blowing nozzle 73 to complete one molding cycle.
• the product held by the product holder is transferred to a predetermined position by the post-process takeout device.
• the mold clamping device 10 is moved to a position directly below the cross head die 71 to close the mold 3 simultaneously with the hollow molded article. Is held by the product holder mounted on the side surface of the platen, and the motor for nozzle driving 77 is driven by the function of the control mechanism to move the air blowing nozzle 73 upward.
• the timings of the above-mentioned mold opening, mold closing and mold clamping operations and the blowing step are as follows. That is, as shown in FIG. 7, the resin is suspended from the multi-head crosshead 71 to form the left and right tubular parisons P in the lateral direction. At this time, the pair of split arms 3a and 3b are in the mold opening position shown in FIGS. 1 and 2, and the pair of locking arms 52a and 52b forming the concave locking member 52 are opened as shown in the illustrated example. , In the position position.
• step 1 of FIG. 8 the advancing and retracting mechanism 20 is driven, that is, the electric motor 7 is driven to rotate the left and right reverse lead ball screws 4 and the front through the front nut (not shown).
• the rear platens 22 are synchronized with one another via the platinum 21 and the rear nut 33 and are slid on the rail 11 so as to be close to each other towards the parting line PLI and the mold closing is performed.
• the Norison P on the left and right are introduced into the cavities 3c and 3d and held in the split molds 3a and 3b.
• step 2 of FIG. 8 the engagement is performed in synchronization with the operation of the mold clamping drive mechanism 40.
• the separation drive mechanism 30 is driven, that is, the engagement portion moving motor 8 is driven. Rotate to rotate the ball screw 6 in the reverse direction.
• the nut 54 engaged with the ball screw 6 retracts the support 53, and the arms 52a and 52b of the concave locking member 52 are fixed to the pin 56 by sliding the pin 59 in the long hole 52d. It rotates in the direction in which the tips approach each other, that is, in the closing direction, with 57 as a fulcrum.
• the pair of locking arms 52a and 52b are rotated to sandwich the convex portion 5 la of the convex locking member 51.
• the mold clamping drive mechanism 40 is driven, that is, the motor 8 is driven to rotate the driving pulley 63 and rotate the endless belt 62 to generate the boot.
• Reel 61 is rotated, ball screw 6 is rotated, and support 53 is pulled in the direction of arrow A in FIG. 3 through nut 54.
• the tip claws 52al, 52bl of both arms pull on the convex portion 51a of the convex locking member 51, and by the tension, the front split mold 3a is pulled toward the rear split mold 3b and the front split mold Press the contact surface of 3a into contact with the contact surface of the rear split mold 3b to generate a mold clamp.
• This mold clamping force As shown in step 4 of FIG. 8, it is checked whether or not the desired value is reached, and when the desired value is reached, the built-in brake of the motor 8 is turned on as shown in step 5. Then, as shown in step 6, reduce the torque value (current value) of the motor 8 to a predetermined value. From the viewpoint of power saving, it is desirable that this predetermined value be a torque value of about 10% during clamping drive.
• the molding die moving device (not shown) is driven under the holding state of the mold clamping force, in other words, the holding pressure of the split molds 3a, 3b, to directly under the multihead crossheads 71, 71.
• the molding die 3 is moved together with the clamping device 10 so that the cavities 3c and 3d are positioned directly below the left and right blow nozzles 73, 73 of the compression device blowing device 74.
• step 7 of FIG. 8 the torque value of the motor 8 is returned to the torque value at the time of mold clamping drive. Then, the blow air is exhausted, and when the exhaust is completed, the brake is released and the force motor 8 is driven, as shown in step 8 of FIG.
• the ball screw 6 is rotated in the direction of arrow B, and the support 53 is moved, and the tip claws 52al, 52bl of the locking arms 52a, 52b and the tip projection 51a of the convex locking member 51. Disengage.
• step 9 of FIG. 8 the mold clamping drive mechanism 40 is driven, that is, the motor 8 is driven to rotate to rotate the ball screw 6 in the forward direction.
• the nut 54 engaged with the ball screw 6 advances the support 53, and both arms 52a, 52b of the concave locking member 52 are guided by the guide walls 58c, 58d of the guide body 58 and By sliding the inside of the long hole 52d, the tip 59 rotates in the direction in which the tips are separated from each other, that is, the direction in which the tips are opened.
• the pair of locking arms 52a and 52b rotate apart, and the pinching of the convex portion 51a of the convex locking member 51 is released.
• step 10 of FIG. 8 the advancing and retracting mechanism 20 is driven, that is, the electric motor 7 is driven to rotate the left and right reverse lead ball screw 4 and the front through the front nut (not shown).
• the platen 21 and the rear platen 22 are parted apart from each other via the rear nut 33 and the mold opening is done until the condition shown in FIGS. 1 and 2 is reached.
• the molding die moving device (not shown) is driven again to position the molding die 2 directly under the multi-head cross head die 71 as shown in FIG.
• the resin is dropped from the crosshead die 71 again to form the left and right cylindrical parisons P, and the mold closing and clamping by the clamping device 10 and the molding by the molding die moving device are performed.
• the mold 3 is moved, and then the air is blown by the blow nozzles 73, 73 to perform hollow molding, and this series of steps is repeated.
• FIGS. 9 to 12 a hollow molding machine according to a third embodiment of the present invention will be described based on FIGS. 9 to 12.
• the hollow molding machine 100 includes an extruder 172 having a multi-head crosshead die 171 for melting and discharging Norison P made of thermoplastic resin, and a pair of opposing
• an air blowing device 174A, 174B provided with a Norison cutting device (not shown) for cutting the upper end of the Norrison P and air blowing nozzles 173, 173 inserted into the Norrison P, and a parison P ⁇ Whether the two molds 103A and 103B that are held are directly under the crosshead die 171 Directly below the air blowing nozzles 173, 173, a mold moving device that moves alternately is configured.
• the molding die attached to one of the two sets of clamping devices 110A and 110B is moved immediately below the air blowing nozzles 173 and 173, and the parison in this molding die is moved.
• the air blowing nozzles 173, 173 are lowered and inserted into P, and air is blown through the air blowing nozzles 173, 173 to blow-mold the parison P into a hollow molded article.
• the molding die attached to the other set of clamping devices moves immediately below the crosshead die 171 to introduce and hold the Norison P, and after cutting the Norison P, the air blowing nozzle 173, The air blowing nozzle is moved down immediately below 173 and inserted into the parison P, and air is blown through the air blowing nozzles 173 and 173 to blow-mold the parison p into a hollow molded article.
• One extruder 172 is disposed in the two sets of clamping devices 110A and 110B to which a molding die is attached, and is a hopper for feeding raw materials 175 into which thermoplastic resin such as polyethylene, polypropylene, polyethylene terephthalate is charged. And a barrel for melting and softening the thermoplastic resin, and a crosshead die 171 for discharging the thermoplastic resin into the cylindrical parison P at the tip end and discharging it, and the thickness and length of the cylindrical parison P, etc. Control mechanism to control the
• Norison cutting apparatus introduces the tubular parison P, which has been melted and discharged from the crosshead die 171 of the extruder, into the mold dies 103A and 103B in the mold open state, and held between the molds.
• the mold is closed, the lower end of the discharged cylindrical parison P is closed, and the upper end of the discharged cylindrical parison P is cut to form a parison P having a predetermined length.
• the cutter holder has an electrothermal cutter at its tip and a cutter holder driving mechanism.
• the two sets of air blowing devices 174A and 174B are mounted on a frame fixed to a Y-direction slide base 181 mounted on a base 176 via a Y-direction slide rail 180.
• the two sets of mold clamping devices 110A and 110B to which the molds 103A and 103B are attached are assembled and have air blowing nozzles 173 and 173, respectively, and are installed adjacent to the cross head die 171.
• the air blowing nozzles 173, 173 are nozzle driving motors 177A, 177B attached via the working bodies connected thereto, A control mechanism (not shown) such as an electric circuit that controls these, when placed at a lower position of the air blowing nozzles 173, 173 forming mold 103A, 103B force containing a cylindrical parison P, the control mechanism
• the nozzle drive motor 177A, 177B is driven by the function to move the air blowing nozzle 173, 173 downward, and after air is blown for a predetermined time, the nozzle drive motor 177A, 177B is operated by the control mechanism.
• the two sets of clamping devices 110A and 110B are disposed below the extruder 172 on the base 176 via the Y-direction slide rail 180 and the Y-direction slide base 181 to open and close the molding die. Is movable in the same direction as the Y direction, and is movable in the direction orthogonal to the above Y direction, that is, in the X direction via the X direction slide rails 182 and 183 disposed on the Y direction slide base 181 It is possible to move on the X direction slide bases 184 and 185 also in the Y direction via the rails 111A and 111B on the first X direction slide base 184 and the second X direction slide base 185.
• the molds 103A and 103B are arranged so that the open / close direction of the molds 103A and 103B is aligned with the axial direction of the extruder 172 and the openings of the molds 103A and 103B are directed to the cross head die 171 side! /.
• a Y-direction ball screw 187 driven by a Y-direction motor 186, which also serves as a servomotor for moving the Y-direction slide base, is disposed.
• a Y-direction ball screw 187 driven by a Y-direction motor 186, which also serves as a servomotor for moving the Y-direction slide base, is disposed.
• X-direction ball screws 190 and 191 driven by X-direction motors 188 and 189, which are servomotors for moving the X-direction slide bases, are disposed below the X-direction slide bases 184 and 185.
• the X-direction slide base 184, 185 is fixed to the ball nut of the ball screw 190, 191 and can be moved via the X-direction slide rail 182, 183 in the X direction which is the axial direction of the ball screw 190, 191. It is provided.
• the clamping device 110A has the same configuration as the clamping device 10 shown in FIGS. 1 to 3, while the clamping device 110B has the configuration shown in FIGS. 13 to 15.
• These clamping devices include a platen and Since the drive mechanisms are arranged reverse to each other and have basically the same configuration except for the points, the following description will be made for the mold clamping device 110B shown in FIGS.
• symbol attaches
• the clamping device 110B includes a front platen 21 and a rear platen 22 slidably mounted on rails 111B disposed at predetermined intervals in the horizontal direction with predetermined intervals.
• the front split mold 3a and the rear split mold 3b held against the pair of platens 21 and 22 and the pair of platens 21 and 22 are threaded, and the pair of platens 21 and 22 are mutually synchronized to make them Parting line Left and right reverse lead ball screw 4 that can be moved toward PLI, and two convex locking members 51 and 51 provided on opposite sides of a pair of platens 21 and 22 and concave locking members 52 , 52, and the locking members 52, 52 to move them to form two sets of the engaging portions 5, 5, and an engaging portion that enables the engaging portions 5, 5 to be pulled.
• the rail 111 B is disposed on the X-direction slide base 185 in the form of a frame and mounted in the longitudinal direction.
• the X-direction slide base 185 corresponds to the gantry 1 shown in FIG.
• the rail 111B is a guide for sliding and moving the pair of platens 21 and 22 with respect to the X-direction slide base 185.
• the guide rail has a rolling portion in which a bearing is endlessly connected. It is a linear guide bearing with a movable body interposed.
• the front platen 21 is slidably mounted on a rail 111 B via a slide member having a bearing incorporated therein.
• convex locking members 51, 51 are disposed to engage with the locking members 52, 52 on the rear platen 22 side.
• the rear platen 22 is slidably mounted on the raceway 111 via a slide member having a bearing incorporated therein.
• concave locking members 52, 52 are disposed at positions matching the convex locking members 51, 51 on the front platen 21 side.
• the front platen 21 and the rear platen 22 are divided into a front split type 3 a and a rear split type 3. b is mounted facing each other.
• 9 and 9 are flash sensors, which correspond to the contact surfaces of the front platen 21 and the rear platen 22 at predetermined proximity positions, in other words, the contact surfaces of the front split mold 3a and the rear split mold 3b. It is adjusted and arranged at the contact position.
• the left and right reverse lead ball screw 4 is inserted into the front platen 21 and the rear platen 22 so that the front platen 21 and the rear platen 22 can move toward the predetermined parting line PLI in synchronization with each other. It is a thing.
• the left and right reverse lead ball screw 4 has a reference portion (incompletely threaded portion) substantially at the center, and a forward screw is screwed toward one end, and a reverse screw is screwed toward the other end.
• a reverse screw is screwed on the right side
• a forward screw is screwed on the left side
• the left end is an X direction slide base
• the height is adjusted and fixed at a predetermined position of 185.
• a platen moving motor 7 is connected via a thrust bearing and a coupling 35.
• one left and right reverse lead ball screw 4 is disposed in front of the figure in FIG. 13, one more is disposed at the back of the figure depending on the type of mold clamping device. You may set it up and make both synchronize and rotate!
• the platen moving motor 7 is a servomotor, and the left and right reverse lead ball screws 4 are rotated by this drive rotation, whereby the front platen 21 and the rear platen 22 are, in other words, a molding die 103B moves away or close to a predetermined parting line PLI.
• the engaging portion 5 faces the front split mold 3a in which the contact surfaces are in contact with each other by the movement of the pair of platens 21 and 22 by the operation of the left and right reverse lead ball screw 4.
• the contact surface of the front split mold 3a is brought into pressure contact with the contact surface of the rear split mold 3b.
• a pulley 61 is provided at the end of the concave locking member 52, 52 via a nut (not shown), ball screw 6, 6 for engagement portion and thrust bearing 55, and the pulley 61 is a belt 62 And, it is connected to the engaging portion moving motor 8 which also has a servomotor force via the driving pulley 63.
• the convex locking members 51, 51 are recessed into the concave locking members 52, 5.
• a drive unit 60 such as an air cylinder or a servomotor or the like for joining the two is provided.
• the driving portion 60 usually causes the projecting locking members 51 and 51 not protruding from the contact (mold) surface of the molding die to project in the engaging portions 5 and 5.
• the mold moving device includes an air blowing nozzle 173 for blowing air into the parison P, which has been discharged by melting the crosshead die 171.
• the mold is transferred to the lower position of the nozzle blowing device 174A, 174B, and the mold clamping device 110A, 110B attached with the molding die 103A, 103B is reciprocated at the lower position of the crosshead die 171 and the lower position of the air blowing nozzle 173.
• the X-direction slide bases 184 and 185 are independently and slideably movably mounted on the Y-direction slide rail 180 disposed on the base 176.
• the Y-direction slide rail 180 has the same structure as the linear guide bearings disposed in the mold clamping device 110A, 110B.
• X-direction ball screws 190 and 191 are installed in the direction orthogonal to the Y-direction slide rail 180 via ball nuts.
• the ball screws 190 and 191 are connected to X-direction mold transfer motors 188 and 189 for driving them via couplings.
• the clamping devices 110A and 110B to which the molding dies 103A and 103B are attached are turned to the X-direction slide bases 184 and 185, respectively. It can be reciprocated / transferred to a lower position of the dove die 171 and a lower position of the air blowing nozzles 173, 173.
• the molding die 103B in the mold open state is disposed below the crosshead die 171 of the extruder 172 by driving the mold clamping device 110B, and in this state, raw materials such as polyethylene, polypropylene, polyethylene terephthalate, etc.
• the resin is supplied to the raw material feeding hopper 1 75 provided in the extruder 172, and the raw resin is melted and softened in the barrel of the extruder 172, and extruded as a cylindrical parison P through the crosshead die 171 in the softened state. Drop the cylinder parison P into the cavity of the mold 11 OB in the mold open state.
• the mold clamping device 110B is driven to close the mold 103B, and the cylinder The lower end of the parison P is closed and the upper end is cut with a parison cutting device (not shown).
• the X-direction motor 189 is driven, and the X-direction ball screw 191 fixing the clamping device 110 B is rotated.
• the mold clamping device 110B moves to the upper right of FIG. 9, that is, the upper side in the X direction in FIG. 12 with the molding die 103 clamped, and always moves from the crosshead die 171 of the extruder 172.
• the Parison P force mold 103B which is continuously extruded, is withdrawn.
• the Y-direction motor 186 is driven, and the Y-direction slide base 181 is located on the lower right side of FIG. Moving to the right, when the clamping devices 110A and 110B and the air blowing devices 174A and 174B on the Y-direction slide base 181 stop at the predetermined positions, the coating line PLI of the clamping device 110A moves to the position of the crosshead die 171. In agreement, the positions of the clamping device 110B and the clamping device 11 OA are switched.
• the nozzle drive motor 177B consisting of a servomotor is driven by the function of the control mechanism to move the air blowing nozzles 173, 173 downward,
• the air blowing nozzle 173 is inserted into the cylindrical parison P, whereby the cutting sleeve at the tip of the air blowing nozzle 173 comes into contact with the counter plate at the top of the molding die 103B and the surplus at the top of the cylindrical parison P While the resin part (upper burr) is cut to form the mouth of the hollow molded product, air is blown into the cylindrical parison P from the air blowing nozzle 173 to carry out blow molding.
• the mold clamping device 110A moves the mold 103A to the left upper side in FIG. 9, that is, the lower side in the X direction in FIG.
• the clamping device 11 OA is stopped below the crosshead die 171 of the extruder 172, similarly to the clamping device 110B, the parison P is clamped by the mold 103A, and at the same time the alpha-blowing device 174A.
• the clamping device 110A is moved to the upper right side in FIG. 9, that is, the upper side in the X direction in FIG.
• the Y direction slide base 181 moves to the left upper side in FIG. 9, that is, to the left in the Y direction in FIG.
• the article is advanced to the left lower side in FIG. 9, that is, the lower side in the X direction in FIG. 12 with the eject device (not shown) open the molded product holder of the eject device.
• Transfer the molded product transferred to the product holder mounted on the side, close the molded product holder and hold it, and start preparation for taking out the hollow molded product (not shown) molded by the mold clamping device 110B. .
• the air blowing 'air exhaustion in the air blowing device 174B of the clamping device 110B is completed, and the air blowing device 174B is removed.
• the mold opening operation is started, and the molding die 103B starts the mold opening operation.
• the molding die 103 B is sufficiently opened, the molded product holder of the take-out device supporting the hollow molded product is a deburring device (not shown) for cutting an excess resin (burr) portion. Is moved to the position of the deburring holder, and one molding cycle by the clamping device 110B is completed.
• the hollow molded product is continuously molded by repeatedly performing the above-described operation.
• FIGS. 13 to 15 This is the same as the mold clamping device 110 A in the embodiment shown in FIGS. 1 to 3 described above.
• the configuration and operation are substantially the same as that of the embodiment, and the same or equivalent portions as those of this embodiment will be described with a part thereof omitted.
• the front split mold 3a and the rear split mold 3b in the mold open state are located directly below the crosshead die 171, as shown in FIG.
• the air cylinder which is the drive unit 60, is driven to project the convex locking member 51 in the direction of the concave locking member 52, and the tubular parison is inserted into the cavities 3c and 3d of the split molds 3a and 3b in the mold open state.
• the platen movement motor 7 is driven and rotated, and the left and right reverse lead ball screws 4 are rotated to synchronize the pair of platens 21 and 22 with each other, and slide on the rail 111.
• the motor 8 for moving the engaging portion which is a servomotor force connected to the ball screw 6 for joint, is driven to rotate, and the ball screw 6 for engaging portion is operated, and the convex locking member 51 Is engaged with the concave locking member 52 to form the engaging portion 5, and subsequently the ball screw 6 for engaging portion is rotated * operated with the contact surfaces of the molding die 103a in contact with each other.
• the front split mold 3a is pulled toward the rear split mold 3b, and the contact surface of the front split mold 3a is pressed against the contact surface of the rear split mold 3b to generate a mold clamp.
• This hollow molding apparatus has an extruder (not shown) for melting and extruding the resin composition as shown in FIGS. 16 and 17 as a working part for molding, a crosshead 201, and a parison cutting apparatus (not shown). And a molding die 202, a blowing device 203, a clamping device 204, a molding die moving device 205, and the like.
• the extruder is provided with a hopper 207 for feeding the resin composition, and a screw, not shown, for transferring, kneading, melting, discharging the resin composition inside the extruder.
• the crosshead 201 is for multiple heads as shown in FIG. 16, and is connected to the tip of the extruder and disposed.
• the resin composition melted by the extruder is also supplied to the crosshead 201 as an extruder force to form two cylindrical parisons P shown by two-dot chain lines in the figure.
• the parison cutting device (not shown) cuts the upper portion of the cylindrical parison P suspended from the crosshead 201, and includes a cutter holder having an electrothermal cutter.
• the molding die 202 is provided with a pair of split molds 202a and 202b so that two cylindrical parisons P can be inserted to form a hollow molded product. , 202d.
• the molding die 202 is positioned directly below the multi-head crosshead 201 and directly below the left and right blow nozzles 208 and 208 of the blowing device 203 by means of a forming die moving device 205 provided with an accompanying die moving motor. In the meantime, it is possible to alternately reciprocate horizontally on rails (not shown).
• the blowing device 203 is inserted into the cylindrical parison P at the upper side of the left and right cavities 202c and 202d of the molding die 202 and blows compressed air, so that a pair of left and right blowing nozzles 208, And a blow nozzle drive device 209 for raising and lowering the blow nozzles 208 and 208.
• the blowing nozzle drive device 209 is connected to a control unit (not shown) Equipped with a motor for driving the blowing device of the variable speed type. Air supply force (not shown) is supplied to the blow-in nozzle 208 so as to supply compressed air!
• the clamping device 204 clamps the split molds 202a and 202b of the molding die 202, as shown in FIGS. 16 to 18, and is disposed at a predetermined interval in the direction horizontal to the paper surface.
• the front platen 211 is a base for supporting the split mold 202a in a frame-like (frame-like) manner in which a flat plate is hollowed out, and the split mold 202a is detachably mounted.
• the rear platen 212 is also a base for supporting the split mold 202b in a frame-like (frame-like) manner in which a flat plate is cut out, and the split mold 202b is detachably mounted.
• the rails 210, 210 are laid on the top surface of the frame-like mount 260. These rails are linear guide bearings formed by interposing a movable body having rolling portions in which bearings are endlessly connected on both sides of the guide rail in the figure. However, other than this, the rail may be a simple guide rail, or may be a track of a strong member that substitutes for a rack.
• the gantry 260 is not limited to a frame shape (frame shape), and may be a flat plate shape.
• the front platen 211 slides through left and right slide members 261, 261 each having a linear guide bearing formed by interposing a movable body having a rolling portion in which bearings are endlessly connected to the left and right rails 210, 210. It is possible to engage.
• the rear platen 212 is also slidably engaged with the left and right rails 210, 210 via the left and right slide members 262, 262 incorporating bearings.
• the advancing and retracting mechanism 220 includes a left and right reverse lead ball screw 221 which moves the platens 211 and 212 in synchronization with the approaching and separating directions with respect to the parting line PLI of the molding die 202, and a rear bra
• a platen moving motor 222 is disposed on the back of the support 212 and coupled to a left and right reverse lead ball screw 221 by a coupling 266.
• the motor 222 uses a normal servomotor in the present embodiment, but may use a linear motor or the like.
• the left and right reverse lead ball screw 221 which is a feed screw, has a reference portion (incompletely threaded portion) 221s substantially at the center and has a forward screw 221a screwed toward one end and a reverse screw toward the other end
• a 22 lb screw is called a left and right reverse lead open / close ball screw
• a forward screw 221a is screwed into a forward screw nut 263 provided on the front platen 211
• the screw 221 b is screwed into a reverse screw nut 264 provided on the platen 212 so that the platens 211 and 212 can move in the direction in which the platens 211 and 212 move close to and away from each other according to the rotation direction of the screws.
• the right end 221 c of the left and right reverse lead ball screw 221 is rotatably supported by a bearing in a support 265 of the mount 260.
• the left end 221 d of the left and right reverse lead ball screw 221 is rotatably mounted by a thrust bearing 224 mounted on a motor mount 223 and coupled to a platen moving motor 222 by a coupling 266.
• reference numeral 267 is a cover for the left and right reverse lead ball screw.
• FIG. 17 and FIG. 18 only one left / right reverse lead ball screw 221 is disposed on the left side of the hollow molding apparatus itself, but depending on the type of the mold clamping apparatus, the hollow molding apparatus itself may be It is also possible to arrange one more on the right side of and make both rotate in synchronization.
• the platen moving motor 222 is a servomotor, and the left and right reverse lead ball screws 221 are rotated by the motor drive rotation, whereby the front platen 211 and the rear platen 212 are in other words,
• the front split 202a and the rear split 202b are in phase with each other and close to and away from the predetermined parting line PLI.
• the flash sensor 268 is attached at a position facing each other above the left side of the front platen 211 and above the left side of the rear platen 212, and the front platen 211 and the rear platen 212 are divided by the front split mold 202 a and the rear split.
• burrs or other foreign matter which is adjusted and disposed at the surface contact position of the mold 202b, ie, the mold closing position. belongs to.
• the clamping drive mechanism 240 is coupled to the left and right clamping members 214 of the rear platen 212.
• the clamping drive mechanism 240 also includes a support 243 which also has two steel plate strengths fixed by sandwiching the left and right concave locking members 214 from both sides, and a nut 244 attached to the left and right supports 243 respectively. , And a moving plate 251 on which a nut 244 and a support 243 are mounted, and a ball screw 241 is screwed to the nut 244. Further, pulleys 245 are attached to the ends of these ball screws 241, and the drive pulley 246 is wound around the endless belt 247 together with the left and right pulleys 245, and the motor 242 is connected to the reduction gear 252.
• the ball screw 241 is rotatably supported by a thrust bearing 248.
• the motor 242 uses a servo motor with a built-in brake, but a linear motor with a brake or the like may be used.
• the engagement / disengagement drive mechanism 230 includes an air drive cylinder 231 attached to a support 243, and the first zinc piece 233 is coupled to the cylinder shaft 232 of the cylinder 231, and both ends of the zinc piece 233.
• the second link piece 234 and the third link piece 235 are linked to each other.
• the ends of the first locking arm 214a and the second locking arm 214b, which form the concave locking member 214, are linked to the link pieces 234 and 235, respectively.
• the support pins 2 49, 250 force transferred between the steel plates of the support 243 rotatably support the first locking arm 214a and the second locking arm 214b.
• the convex locking member 213 is driven by the drive mechanism 280 as shown in FIG. 18 and FIG.
• the position attached to the platen 211 can be moved back and forth!
• the drive mechanism 280 includes a handle shaft 281 for attaching a handle (not shown), a lower pulley 282 connected to the handle shaft 281, an endless belt 283 wound around the lower pulley 282, and an upper portion around which the belt 283 is wound.
• a pulley 284 and a screw portion 285 moved in the front-rear direction according to the rotation of the upper pulley 284 to move the convex locking member 213 back and forth, the tensile force applied to the convex locking member 213
• the end surface of the upper pulley 284 abuts against the back plate of the front brace 211 via the screw portion 285 and is received.
• the drive mechanism 280 is omitted in FIG. 17 for the sake of explanation.
• the movement of the pair of split mold clamping and mold opening and closing is driven by separate drive systems of the motor 242 and the cylinder 231. Therefore, when changing the molding die 202 according to the product to be hollow-molded, even if the mold thickness of the pair of split dies changes according to the product, the first locking member 213 can drive the drive mechanism 280
• the second locking member 214 can adjust the position of engagement / disengagement by adjusting the position of the moving plate 251 by the rotation of the motor 242, and can absorb the mold thickness change of the split mold.
• the locking members 213 and 214 are not limited to those in which the convex one is gripped by the concave one as in the illustrated example, for example, a hook-shaped member in which both are gripped and engaged, a grooved surface Alternatively, they may be engaged with each other by rotating and engaging each other.
• the convex locking member 213 is provided on the rear platen 212 side, and the concave locking member 214 is provided on the front platen 211 side, according to which the pulley 245, the belt 244 and the motor 242 are provided.
• the drive mechanism which consists of these may be provided in the front platen side.
• a plurality of motors 242 may be separately provided without using pulleys or belts and used in synchronization with each other.
• step 21 of FIG. 21 the advancing and retracting mechanism 220 is driven, that is, the electric motor 222 is driven to rotate the left and right reverse lead ball screw 221, and the forward through the nut 263.
• the rear platen 212 is brought close to the parting line PLI through the platen 211 and the nut 264 to close the mold.
• the Norison P on the left and right are introduced into the cavities 202c and 202d, and held in the mold halves 202a and 202b.
• the engagement / disengagement drive mechanism 230 is driven to air-drive the cylinder 231, thereby feeding the cylinder shaft 232 forward, and the link piece 233 ,
• the first link piece 234 and the second link piece 235 are arranged in the vertical direction as shown in FIG. 20 to rotate the pair of locking arms 214a, 214b of the concave locking member 214 by the link function,
• the convex locking member 213 is sandwiched.
• a slight gap is formed between the tip claws 214al and 214bl of the locking arms 214a and 214b and the tip convex part 213a of the convex locking member 213.
• the mold clamping drive mechanism 240 is driven, that is, the motor 242 is driven to rotate the speed reducer 252 and the drive pulley 246 while rotating the endless belt 2 47.
• the pulley 245 is rotated, the ball screw 241 is rotated, and the support 243 is pulled in the direction of arrow A in FIG.
• the concave locking member 214 is pulled while the convex locking member 213 is engaged, and the molds 202a and 202b are transferred between the molds 202a and 202b through the platens 211 and 212. For example, 50kN will occur.
• the mold clamping force reaches a desired value (eg, 1.5 KW for a 50 kN mold clamp and 5.3 Nm for a ball screw lead of 10 mm for a servomotor, as shown in step 24 of FIG. 21). If the desired value is reached, the brake built in the motor 2 42 is turned on as shown in step 25, and the torque value (current value) of the motor 242 is set to a predetermined value as shown in step 26. Lower to From the viewpoint of power saving, this predetermined value is preferably a torque value of 10% of the clamping drive U ,.
• the molding die moving device 205 is driven to position power immediately below the multihead crosshead 201, 201. Cavities 202a and 202 directly below the left and right blow nozzles 208 and 208 of the compression device blow device 203.
• the mold 202 is moved along with the clamping device 204 so that b is positioned.
• step 27 of FIG. 21 the torque value of the motor 242 is returned to the torque value at the time of mold clamping drive. Then, the blow air is exhausted, and when the exhaust is completed, the motor 242 is driven to rotate the ball screw 241 in the mold release direction, that is, in the arrow B direction in FIG. 20, as shown in step 28 of FIG.
• the support body 243 is moved to move slightly between the tip claws 214al and 214bl of the locking arms 214a and 214b and the tip convex part 213a of the convex locking member 213 so as to form a space.
• the engagement / disengagement drive mechanism 230 is driven to air-drive the cylinder 231, thereby pulling the cylinder shaft 232 rearward, and the link piece 233,
• the link function of the first link piece 234 and the second link piece 235 the claw portion 214al of the first locking arm 214a and the claw portion 214bl of the second locking arm 214b are rotated in a direction away from each other, Release stop member 213.
• Step 30 of FIG. 21 the advancing and retracting mechanism 220 is driven, that is, the motor 222 is driven to rotate the left and right reverse lead ball screws 221, and the front bracket 211 via the nut 263. , And nuts 264 to move the rear platens 212 away from the parting line PLI and perform mold opening until the condition as shown in FIGS. 17-19 is reached.
• the molding die moving device 205 is driven again to position the molding die 202 directly under the multi-head cross head 201 as shown in FIG. After that, as described above, the resin is dropped from the crosshead 201 for multiple heads again to form the left and right cylindrical parisons, and the mold closing and clamping by the clamping device 204 and the molding die moving device 205 are performed. The molding die 202 is moved, and the air is blown by the blow nozzles 208 and 208 to perform hollow molding, and the series of steps are repeated.
• high-speed opening and closing operation of the molding die and high mold clamping force can be generated to perform mold clamping reliably.
• it is possible to save labor for pulling drive sources for clamping.

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• 2005
  • 2005-10-14 KR KR1020077011005A patent/KR101239701B1/ko active IP Right Grant
  • 2005-10-14 WO PCT/JP2005/018924 patent/WO2006041148A1/ja active Application Filing
  • 2005-10-14 JP JP2006540977A patent/JP4641527B2/ja active Active

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