JP4287841B2 - Horizontal mold clamping device for injection molding machine - Google Patents

Description

  The present invention relates to a horizontal mold clamping apparatus for an injection molding machine in which a movable platen is composed of a mold clamping plate and a mold mounting platen.

  As a horizontal mold clamping device that consists of a mold clamping machine and a mold mounting board, a platen support material is inserted through the tie bar on both sides behind the toggle mechanism of the movable platen, and the platen support material is movable. It is connected to the platen and supported by guide rails on the machine base frame, and the tie bar is supported by the platen support material to prevent fluctuations in the height position of the movable platen caused by bending of the tie bar due to the load on the movable platen. There is something that is.

In addition, the platen at the tip of the toggle mechanism is connected to the back of the movable platen through which the tie bar is inserted, and the lower part of the movable platen is fixed to the support member to which the front roller and the rear roller that move back and forth on the base frame are attached. A notch is provided between the center portion of the support member and the mounting portion of the rear roller, so that the deformation of the support member due to the load of the tie bar and the movable platen at the time of mold clamping is buffered by the leaf spring effect of the notch Some of them absorb by the above and allow deformation of the movable mold and the movable mold.
JP 2003-266503 A JP 2002-36322 A

  In the conventional technology in which the movable platen is supported by the guide member using a pair of left and right platen support members connected to the rear side, the movable platen support member is individually connected to the rear surface of the movable platen, so it is movable. The tensile force and the compressive force concentrated on the connecting part as the board moves forward and backward acts on the platen support material as bending stress with both ends inserted through the tie bars as fulcrums. This bending stress does not act evenly on the left and right, and this causes a slight difference in height in the support of the tie bar by the platen support material, which causes an unbalanced strain in the movable platen during mold clamping. This makes high-precision mold clamping difficult.

  Further, since the weight of the movable platen, the movable mold, and the toggle mechanism is supported by the connecting member of the platen support member, the burden of the guide means provided on the platen support member is large, and the movable platen may be connected to the platen support member. Since there is a clearance around the tie bar inserted through the movable platen, it tends to tilt toward the fixed platen due to the movable load. Even if the inclination is very slight, it affects the mold opening / closing and clamping of the mold, which makes it difficult to perform high-precision clamping.

  Further, in the above-described prior art that allows the movable plate and the movable side mold to be deformed by fixing the movable platen inserted through the tie bar to the support member and absorbing the deformation of the support member at the time of mold clamping by the buffering action of the notch portion. Since the toggle mechanism is not supported by the board, the movable board tends to tilt toward the rear link housing due to the load of the toggle mechanism. For this reason, if the load on the toggle link mechanism side is larger than the mass of the movable type attached to the movable platen, it becomes an unbalanced load and the support member is deformed from the notch, and the movable plate is slightly rearward. The mold is closed in an inclined state. As a result, there arises a problem that high-precision clamping cannot be performed depending on the mold.

  The present invention has been conceived in order to solve the above-described conventional problems. The object of the present invention is to provide a guide means for the movable plate even if the movable plate is composed of a mold clamping plate and a die mounting plate. It is possible to prevent the occurrence of tilting due to load and unbalanced distortion of the mold clamping machine by being mounted and fixed and connected to the horizontal mold of a new injection molding machine that can perform high-precision mold clamping. The object is to provide a mold clamping device.

  According to the above-described object, the present invention provides a movable plate that is connected to a fixed platen and a pressure plate by a tie bar, and that is inserted through the tie bar so as to be movable forward and backward. The movable platen is connected to the mold clamping means, the mold clamping plate is inserted into the tie bar and the central part is in contact with the mold clamping plate, and the mold mounting plate is integrally coupled with the mold clamping plate. The lower end of both the mold clamping plate and the mold mounting plate is placed on the guide means slidably arranged on the machine base, and the mold mounting plate is fixed to the guide means, while the mold It consists of loosely connected machines.

  The guide means includes a height adjustment mechanism at the front and rear portions between the thick seat plate on which both the mold clamping plate and the die mounting plate are placed, and the seat plate and the sliding plate installed on the machine base. A pair of guide means is slidably installed on both sides of the machine base, and both lower ends of the mold clamping plate and the mold mounting plate are placed on the seat plate, and the mold is placed on the front portion of the seat plate. The mounting board is fixed with bolts, and the mold clamping board is loosely connected to the rear part with bolts.

  In this invention, since the movable platen is composed of a mold clamping plate and a mold mounting plate that are coupled to each other, even if the mold clamping force is received by the mold clamping mechanism when the movable platen is clamped, The mounting plate is not distorted together with the mold clamping machine, and the mold can be strongly clamped with high accuracy.

  In addition, both the mold mounting plate that tends to tilt toward the stationary platen due to the mold load and the mold clamping plate that tends to tilt toward the pressure platen under the load of the clamping mechanism slide on the machine base. Since it is mounted and fixed and connected to the height-adjustable guide means, there is no vertical runout due to both inclinations of the movable platen, and the mold clamping machine is loosely connected to the guide means and connected to the guide means. Since it is not restrained and distortion within the range is allowed, it is possible to prevent uneven distortion caused by connecting the mold clamping machine to the guide means, and to perform high-precision mold clamping of the mold. .

  The drawings are explanatory views in which details of a horizontal mold clamping apparatus according to the present invention employing a toggle mechanism as mold clamping means are omitted.

  In the figure, 1 is a fixed platen, 2 is a pressure platen, and is installed on a machine base 4 connected by tie bars 3 and 3 at four corners. 5 is a movable plate that is inserted into the tie bars 3 and 3 so as to be movable forward and backward with respect to the fixed platen 1. A mold clamp provided with a pair of upper and lower toggle links 61 and 61 between the movable platen 5 and the pressure receiving plate 2. The toggle mechanism 6 is provided by connecting the toggle links 61 and 61 to the upper and lower positions of the pressure receiving plate 2 and the movable platen 5, respectively.

  At the center of the pressure platen 2, a toggle drive screw shaft 62 located in the center between the toggle links is rotatably inserted horizontally and supported, and the toggle links 61, 61 are attached to the screw shaft 62. A cross head 64 that bends and extends through the operating links 63 and 63 is screwed so as to move forward and backward by the rotation of the screw shaft 62 by an electric servo motor (not shown).

  The movable platen 5 includes a mold clamping plate 51 connected to the toggle links 61 and 61, and a mold attachment platen 52 that abuts the central portion of the plate surface of the mold clamping plate 51 and is fixed integrally with a bolt 51 ′. Become. The tie bars 3, 3 are inserted through the bushes 53 at the four corners of the mold mounting board 52 with clearance, and a rotating board 54 is attached to the front surface of the mold mounting board 52 facing the fixed board 1. A pair of left and right dies 7 are attached to the rotating plate 54 and the fixed plate 1 separately into a movable die 7a and a fixed die 7b, and the toggle mechanism is used for opening and closing and closing the die 7. 6 can be performed by a mold mounting plate 52 and a rotating plate 54 that move forward and backward together with the mold clamping plate 51.

  Reference numeral 9 denotes a pair of left and right guide means of the movable platen 5, a thick seat plate 91 on which both the mold clamping plate 51 and the mold mounting plate 52 are placed, and a sliding plate installed on the seat plate 91 and the machine base 4. It comprises a known height adjusting mechanism 8 provided with a pair of wedges with the inclined surfaces thereof in the front and rear portions between them. The guide means 9 is installed on the machine base 4 by placing a sliding plate 92 on a receiving plate 10 provided on both sides of the upper surface of the machine base 4, and a mold clamping machine is mounted on the seat plates 91 of the guide means 9 on both sides thereof. 51 and the mold mounting board 52 are placed on the seat plate by fitting both sides of the lower end part formed in the outward stepped parts 51a and 52a. The mold mounting plate 52 is vertically fixed to the front portion of the seat plate 91, and the mold clamping plate 51 is loosely connected to the rear portion.

  The fixing of the seat plate 91 and the mold mounting plate 52 and the connection of the mold clamping plate 51 are performed by inserting the fixing bolt 93 and the connecting bolt 94 into the bolt holes drilled in the seat plate 91, respectively, and the screw shaft ahead of the fixing plate 93 outward. The fixing bolt 93 is tightened and the connecting bolt 94 is loosely tightened by screwing into the screw holes drilled in the inner ends of the step portions 51a and 52a, and the pressing force by the extension of the toggle link 61 is applied to the connecting portion of the mold clamping plate 51. Even if it is applied, the pressing force is reduced by the looseness of the connecting portion.

  11 is a drive gear of a rotary drive device (not shown) disposed at the lower center of the movable platen 5, and the drive gear 11 meshes with a concentric driven gear 12 mounted in the rear surface of the rotary plate 54; The rotating disk 54 is rotated 180 ° by a rotation driving device so that the two sets of molds 7 can be exchanged.

  In the above configuration, since the movable platen 5 is composed of the mold clamping platen 51 and the die mounting platen 52 which are joined by contacting the central part, a toggle mechanism is used during mold clamping after the mold is closed by the forward movement of the movable platen 5. 6, even if the mold clamping machine 51 receives a strong mold clamping force and the distortion occurs, the contact portion between the mold clamping machine 51 and the mold mounting board 52 is limited to the center portion. There is no distortion along with the board 51, and there is no mutual displacement due to the distortion of the movable mold 7a and the fixed mold 7b in the mold 7. Thereby, the strong mold clamping of the metal mold 7 can be performed with high accuracy.

  Further, even if the mold mounting plate 52 is coupled to the mold clamping plate 51, there is a clearance around the tie bar 3 in the bush 53, so that the die mounting plate 52 is moved to the fixed plate side due to a biased load on the front side due to the load of the movable die 7 a. It tends to tilt. The mold clamping machine 51 that is not inserted through the tie bar 3 tends to incline toward the pressure receiving board under the load of the toggle mechanism. The inclination in the opposite direction becomes the vertical swing in the front-rear direction of the movable platen 5 that moves forward and backward, and the tilt due to the vertical swing is very slight in the clearance range. This also causes loosening of the connection between the mold 7 and the mold 7, which can prevent the mold 7 from being opened and closed and clamped with high accuracy. However, both the mold clamping plate 51 and the mold mounting plate 52 are placed on the seat plate 91 of the guide means 9 that is adjustable in height and slides on the machine base 4. By fixing and connecting the mold clamping platen 51, both inclinations are prevented, so that there is no vertical runout for each movement of the movable platen 5, and the mold 7 can be clamped with high accuracy. Also, the binding site is not loosened.

  Further, when the mold clamping machine 51 is clamped by the extension operation of the toggle mechanism 6, distortion occurs evenly with the joint portion with the mold mounting board 52 as the center, but the lower end portion of the mold clamping machine 51 is connected to the guide means 9. If there is a state of being constrained by this, a strain difference is generated between the unconstrained side and this strain difference becomes a bias of the pressing force against the mold mounting plate 52, and the mold 7 is clamped with high accuracy. It becomes difficult. However, since the mold clamping machine 51 is loosely connected to the pedestal 91 so as not to be restrained by the guide means 9 and distortion in that range is allowed, the unevenness caused by connecting the mold clamping machine 51 to the guide means 9 is uneven. Generation of a significant distortion is prevented.

  Therefore, even in the case of a horizontal mold clamping device in which the movable platen 5 is divided into a mold clamping platen 51 and a mold mounting platen 52, and both of them are connected to each other and the mold clamping platen 51 is connected to the toggle mechanism 6, The mold 7 can be clamped with high accuracy by placing the mold clamping plate 51 that allows the mold mounting plate 52 to be fixed and distorted to the guide means 9.

  Further, since the mold clamping plate 51 is supported by the guide means 9, it is possible to suppress the mutual distortion of the link when the toggle mechanism 6 is extended, and it is not necessary to prevent the distortion of the link by the bush 53 inserted through the tie bar 3. Therefore, the bush 53 can be formed short to save space.

  In addition, although the said embodiment has attached the rotary disk to the mold mounting disk, it cannot be overemphasized that it is applicable also to the horizontal type mold clamping apparatus without a rotary disk. Further, although a toggle mechanism is employed as the mold clamping means, the mold clamping means may be a direct pressure type by hydraulic pressure, and the guide means may be a linear guide mechanism that is normally employed. As shown in the figure, the guide means is not limited to those common to both the mold clamping machine and the mold mounting board, but may be one provided on the machine base for each of the mold clamping machine and the mold mounting board. Therefore, the present invention is not limited to the above embodiment.

It is a side view of the horizontal mold clamping apparatus of the injection molding machine concerning this invention. It is a side view of a movable board same as the above. It is the front view by the side of the rotary board of the movable board which cut out the lower part of one side of a mold mounting board, and showed the lower part of a mold clamping board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixed platen 2 Pressure receiving plate 3 Tie bar 5 Movable platen 51 Clamping platen 51a Outward stepped portion 52 Type mounting platen 52a Outward stepped portion 6 Toggle mechanism 7 Mold 8 Height adjustment mechanism 9 Guide means 91 Seat plate 92 Sliding plate 93 Fixed Bolt 94 Connecting bolt

Claims (2)

The fixed platen and the pressure platen are connected by a tie bar, and the movable platen includes a movable plate that is inserted through the tie bar so as to be movable forward and backward with respect to the fixed platen, and mold clamping means provided between the pressure platen and the movable platen. Is composed of a mold clamping machine connected to the mold clamping means, and a mold mounting board that is inserted through the tie bar and abuts the central part with the mold clamping machine and is integrally coupled to the mold clamping machine. The lower end of both the panel and the mold mounting board are placed on the guide means slidably arranged on the machine base, and the mold mounting board is fixed to the guide means, while the mold clamping board is loosely connected. A horizontal mold clamping device for an injection molding machine.
  The guide means includes a height adjustment mechanism at the front and rear portions between the thick seat plate on which both the mold clamping plate and the mold mounting plate are placed and the seat plate and the sliding plate installed on the machine base. A pair of guide means is slidably installed on both sides of the machine base, and both lower ends of the mold clamping plate and the mold mounting plate are placed on the seat plate, and the die is attached to the front portion of the seat plate. 2. The horizontal mold clamping apparatus for an injection molding machine according to claim 1, wherein the board is fixed with bolts, and the mold clamping machine is loosely connected to the rear part with bolts.

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