JP2010241076A - Injection molding machine equipped with nozzle touch mechanism section - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection molding machine which can prevent an phenomenon of inclining ahead when a nozzle is pushed to a stationary board and further can prevent occurrence of vertically asymmetric deformation at a stationary board and a mobile board when mold clamping is performed. <P>SOLUTION: The injection molding machine is equipped with a nozzle touch mechanism section and injects a molten material from a top end of the nozzle 10 into a metallic mold fixed to the stationary board 6 and the mobile board 2. The injection molding machine is equipped with the stationary board 6, the nozzle touch mechanism section 16 for pushing the nozzle 10 to a stationary side metallic mold, a stationary board supporting member 22 for supporting the stationary board 6 by a protrusion 6b in a vertical direction of the stationary board 6 and a nozzle touch joining member 20 for joining the protrusion 6b and the nozzle touch mechanism section 16. Nozzle touch force of the nozzle 10 for pushing the stationary side metallic mold is transmitted to the nozzle touch mechanism section 16 via the nozzle touch joining member 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an injection molding machine provided with a mold clamping mechanism for clamping a mold with a movable platen and a fixed platen.

In an injection molding machine that molds a molded product by injecting a resin or metal melt into the mold from the tip of the nozzle, the entire injection molding mechanism is moved forward and backward relative to the fixed plate to which the mold is attached. There is provided a nozzle touch mechanism that presses or separates a nozzle provided at the tip of the heating cylinder of the mechanism against a spool of a mold fixed to a fixed platen.
In precision molding such as lens molding using an injection molding machine, a slight deviation of the mold greatly affects the quality of the molded product. Therefore, it is necessary to perform the mold opening / closing operation of the injection molding machine with high accuracy. Regarding the accuracy of mold opening and closing, the parallelism and positional deviation (eccentricity) between the fixed platen and the movable platen lead to the deviation of the mold and affect the molded product.

There is deformation of the stationary platen as a cause of deteriorating the accuracy of the mold opening / closing operation. When the nozzle for injecting the molten resin is pressed against the stationary platen, the stationary platen falls due to the pressing force at that time. When the mold clamping force is generated, the tie bar connected to the fixed platen and the rear platen receives the reaction force of the mold clamping force, and the tie bar extends and the fixed platen bends.
Usually, since the lower side of the fixed platen is supported by the machine frame, the bending of the fixed platen becomes uneven in the vertical direction, and the accuracy of the mold deteriorates. Therefore, it is necessary to prevent both the falling of the fixed platen and the unevenness of deformation.

Patent Document 1 discloses an injection molding method in which a sliding plate is attached to a support leg at the lower end of a fixed platen, and the bending deformation of the fixed platen that occurs during mold clamping is made minute and uniform to stabilize the dynamic accuracy of the fixed platen. The technology of the machine is disclosed.
Patent Document 2 discloses an injection in which a fixed platen is attached to a base, the fixed platen is allowed to move toward the base plate during mold clamping, a mold clamping force can be generated uniformly, and a molded product can be made highly accurate. A molding machine technology is disclosed.
Patent Document 3 discloses a technique of an injection molding machine that enables a stationary platen on which a fixed mold is mounted and a rear platen to be moved in a horizontal direction on a base plate, thereby suppressing variations in thickness distribution of a molded product such as an optical disk substrate. It is disclosed.

Patent Document 4 discloses a technique of an injection molding machine provided with a mechanism for preventing a collapse when a nozzle is pressed against a stationary platen by using a connecting member.
In Patent Document 5, the center of the support shaft of the fixed platen is perpendicular to the moving direction of the movable platen, is parallel to the base surface of the apparatus, and intersects the central axis of the fixed platen. The technology of an injection molding machine that prevents the deformation of the nozzle from becoming asymmetric in the vertical direction and prevents the collapse when the nozzle is pressed is disclosed.

JP-A-9-207181 JP 2001-212857 A Japanese Patent Laid-Open No. 2004-74454 JP 2004-38764 A JP 2001-239561 A

The techniques disclosed in Patent Documents 1 to 3 described in Background Art can solve problems such as bending of the fixed platen, but the fixed platen falls when the nozzle of the injection molding machine is pressed against the fixed platen. Cannot be prevented.
Further, the techniques disclosed in Patent Document 4 and Patent Document 5 can solve the problem of falling of the fixed platen that occurs when the nozzle is pressed against the fixed platen, but prevent the bending of the fixed platen during mold clamping. It is not possible.

As described above, the conventional technology described in the background art has the problem that when the nozzle for injecting the molten resin is pressed against the fixed platen, the fixed platen collapses due to the pressing force at that time, and the mold clamping force. If generated, the tie bar connected to the fixed platen and the rear platen receives the reaction force of the mold clamping force, and the tie bar extends and the problem that the fixed platen bends is not solved.
Therefore, in view of the above-mentioned problems of the prior art, the object of the present invention is to prevent the phenomenon of tilting forward when the nozzle is pressed against the stationary platen, and when the mold is clamped, the stationary platen and the movable platen are asymmetrical. An object of the present invention is to provide an injection molding machine capable of preventing deformation.

The invention according to claim 1 of the present application is an injection molding machine that injects a molten material from a tip of a nozzle into a fixed plate and a mold fixed to the movable plate, and a nozzle touch mechanism unit that presses the nozzle against a fixed side mold; A fixed platen support member for supporting the fixed platen at a central portion in the vertical direction of the fixed platen, and a nozzle touch connecting member for connecting the central unit and the nozzle touch mechanism unit, An injection molding machine provided with a nozzle touch mechanism, wherein the nozzle touch force to be transmitted is transmitted to the nozzle touch mechanism via the nozzle touch coupling member.
The invention according to claim 2 is the injection molding machine provided with the nozzle touch mechanism according to claim 1, wherein the fixed platen support member and the nozzle touch connecting member are integrally formed.

  INDUSTRIAL APPLICABILITY According to the present invention, an injection molding machine capable of preventing a phenomenon in which the fixed platen tilts forward when the nozzle is pressed against the fixed platen, and preventing the asymmetrical deformation of the fixed platen when performing mold clamping. Can provide.

It is an external appearance perspective view of embodiment of this invention which is an injection molding machine provided with the nozzle touch connection member. It is a side view of embodiment of this invention which is an injection molding machine provided with the nozzle touch connection member. It is an external appearance perspective view which is an embodiment of the present invention provided with a fixed board support member and nozzle touch connection member. It is an external appearance perspective view of an embodiment of the present invention which is an injection molding machine provided with a nozzle touch connecting member, and is a diagram for explaining that the nozzle touch connecting member and the stationary platen support member are fixed to the central part of the stationary platen with bolts. It is. FIG. 5 is a front view of FIG. 4.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an external perspective view of an embodiment of the present invention which is an injection molding machine provided with a nozzle touch connecting member. The injection molding machine has a mold clamping part and an injection part on a machine base 24. The mold clamping unit includes a movable platen 2 to which the movable die 30b is attached and a fixed plate 6 to which the fixed die 30a is attached (see FIG. 2 for the fixed die 30a and the movable die 30b).

  One end of each of the four tie bars 4 is fixed to the four tie bar fixing portions 6 a of the fixed plate 6, and is slidably inserted through the insertion holes 2 a provided at the four corners of the movable plate 2. The end is fixed to a rear platen (not shown). The stationary platen 6 includes a pair of protrusions 6b in a plane that includes the central axis of the nozzle 10 and is symmetric with respect to the central axis of the nozzle. In the configuration shown in FIG. 1, the lower end of the stationary platen 6 can slide on the surface of the machine base 24 in the axial direction of the nozzle 10.

  The mold opening / closing drive source (not shown) for driving the movable platen 2 is a servo motor or a hydraulic cylinder. In the case of a direct pressure type mold clamping unit, the piston of the hydraulic cylinder and the rotation of the servo motor are linearly moved. In the case of a toggle type clamping unit, the piston of a hydraulic cylinder and the linear drive of a ball screw mechanism that converts the rotation of a servo motor into a linear motion. By moving the crosshead of a known toggle link mechanism back and forth by the section, the movable platen 2 is moved back and forth via a toggle link mechanism (not shown).

  The upper end portion of the fixed plate support member 22 is coupled to two projecting portions 6 b provided on both side surfaces of the fixed plate 6 to support the fixed plate 6. The position of the protrusion 6 b of the fixed plate 6 is in a symmetrical position with respect to the central axis in a horizontal plane including the central axis of the nozzle 10 inserted into the nozzle insertion hole 8. Further, the protruding portion 6 b is the center position in the vertical direction of the stationary platen 6. The upper end of the fixed plate support member 22 or the side surface of the fixed plate support member 22 as shown in FIGS. 4 and 5 does not move relative to the protruding portion 6b of the fixed plate 6 by bolts (not shown) or welding. It is fixed to. The lower end surface of the fixed plate support member 22 is fixed to the machine base 24.

  During the mold clamping operation of the mold clamping portion, the movable platen 2 is moved toward the fixed platen 6 and the reaction force caused by the four tie bars 4 being stretched by the mold clamping force causes tie bars at the four corners of the fixed platen 6 to move. It is applied to the fixing portion 6a. In the present invention, the protrusions 6b, 6b on both sides of the fixed platen are supported by the upper ends of the pair of fixed plate support members 22, and the lower end of the fixed platen 6 is placed on the surface of the machine base 24 in the axial direction of the nozzle 10. Because the fixed platen support member 22 supports the center of the fixed platen 6 through which the nozzle 10 passes, the bending of the fixed platen 6 becomes uniform in the vertical direction even during mold clamping.

  An injection molding machine that molds a molded product by injecting resin into the mold from the tip of the nozzle 10 moves the injection mechanism section 14 back and forth with respect to the stationary platen 6 to which the mold is attached. The nozzle 10 provided at the tip of the cylinder 12 is pressed against or separated from the spool (not shown) of the fixed mold 30 a fixed to the fixed plate 6 through the nozzle insertion hole 8 provided in the fixed plate 6. A nozzle touch mechanism 16 is provided.

  The nozzle touch mechanism unit 16 causes the ball screw 18 to rotate forward or backward by a drive motor (not shown) to move the injection mechanism unit 14 forward and backward on the stationary platen 6. The nozzle touch mechanism unit 16 moves the injection mechanism unit 14 in the direction of the fixed platen 6 and applies a predetermined force (hereinafter referred to as “nozzle touch force”) to the nozzle 10 at the tip attached to the cylinder 12 of the injection mechanism unit 14. Therefore, it is pressed against the fixed mold 30 a attached to the fixed platen 6.

  A bearing 26 is fixed to the leg portion 20a of the nozzle touch connecting member 20 so as to support the ball screw 18 so as to be rotatable but not axially movable. The other end of the ball screw 18 pivotally supported by the bearing 26 is connected to a drive motor (not shown) disposed in the nozzle touch mechanism 16 via a coupling (not shown). The nozzle touch mechanism 16 includes the drive motor (not shown), a coupling (not shown), and a ball screw 18.

  The nozzle touch connecting member 20 is formed on the rail 10 provided on the machine base 24 and the coupling portion 20b coupled to the protruding portion 6b of the stationary platen 6 and the side surface of the stationary platen support member 22 on the injection mechanism unit 14 side. And a leg portion 20a supported so as to be movable in parallel with the axial direction. A bearing 26 is integrally provided on the leg portion 20 a of the nozzle touch connecting member 20. The nozzle touch connecting member 20 functions as a member that prevents the fixed platen support member 22 from being tilted forward by the nozzle touch force. Therefore, by using the nozzle touch connecting member 20, it is possible to prevent a phenomenon in which the fixed plate 6 tilts forward in the direction of the movable platen 2 when the nozzle 10 is pressed against the fixed plate 6.

  As described above, the embodiment of the present invention includes the fixed platen support member 22 and the nozzle touch connecting member 20 to prevent the asymmetrical deformation of the fixed platen and the movable platen when the mold clamping is performed. In addition, it is possible to prevent the phenomenon that the stationary platen 6 tilts forward in the direction of the movable platen 2 when the nozzle 10 is pressed against the fixed mold 30a attached to the stationary platen 6. A molding machine can be provided.

FIG. 2 is a side view of an embodiment of the present invention which is an injection molding machine including a nozzle touch connecting member. The fact that the nozzle touch force is transmitted to the nozzle touch mechanism 16 will be described with reference to FIG.
The nozzle touch mechanism unit 16 drives a driving motor (not shown), and the fixed side mold attached to the fixed plate 6 with the nozzle touch force of the nozzle 10 attached to the cylinder 12 of the injection mechanism unit 14. Press against 30a. In FIG. 2, the fixed side mold 30a and the movable side mold 30b are opened, but the pressing by the nozzle touch force of the nozzle 10 is performed in a state where the molds 30a and 30b are clamped.

  A driving motor (not shown) of the nozzle touch mechanism unit 16 is driven, and the tip of the nozzle 10 is brought into contact with and pressed against the fixed mold 30a. This pressing nozzle touch force is generated by the force by which the ball screw 18 pulls the nozzle touch connecting member 20.

  The nozzle touch force acts on the center part of the fixed platen and in the direction inclined toward the movable platen side. The force is connected to the nozzle touch connecting member 20 coupled to the center of the fixed platen. Since the acting point and the receiving point are at the same height in the horizontal plane including the central axis of the nozzle 10, no bending moment for tilting the stationary platen 6 forward toward the movable platen 2 is generated.

  FIG. 3 is an external perspective view showing an embodiment of the present invention provided with a fixed platen support / nozzle touch connecting member. Reference numeral 32 denotes a stationary platen support / nozzle touch connecting member. The fixed platen support / nozzle touch connection member 32 includes a leg 32a, a nozzle touch connection 32b, and a fixed plate support 32c. The functions of the leg 32a, the nozzle touch connecting part 32b, and the fixed platen support part 32c are the same as those of the leg 20a, the nozzle touch connecting member 20, and the fixed platen support member 22 described with reference to FIGS. It is. In this embodiment, the number of components is reduced, the assembly is easy, and the manufacturing cost can be reduced.

As shown in FIG. 3, the fixed platen support / nozzle touch coupling member 32 has a symmetrical shape so as to support the protruding portions 6 b and 6 b of the fixed platen 6. The upper end portion of the fixed plate support / nozzle touch connecting member 32 is connected to the protruding portions 6b, 6b by bolts or welding. Further, a bearing 26 is integrally provided on the lower leg portions 32 a and 32 a of the fixed plate support and nozzle touch connecting member 32.
FIG. 4 is an external perspective view of an embodiment of the present invention that is an injection molding machine provided with a nozzle touch connecting member, in which the nozzle touch connecting member and the fixed plate support member are fixed to the center portion of the fixed plate with bolts. FIG. The nozzle touch connecting member 20 fixes the connecting portion 20b to the side surface of the protruding portion 6b of the fixed plate 6 with two bolts. The fixed plate support member 22 has its upper end fixed to the side surface of the protruding portion 6b with four bolts. FIG. 5 is a front view of FIG. The joint portion 20b of the nozzle touch connecting member 20 on the side not visible in FIG. 4 and the upper end portion of the fixed plate support member 22 are similarly fixed to the protruding portion 6b of the fixed plate 6 using bolts.

DESCRIPTION OF SYMBOLS 2 Movable board 2a Insertion hole 4 Tie bar 6 Fixed board 6a Tie bar fixing part 6b Protrusion part 8 Nozzle insertion hole 10 Nozzle 12 Cylinder 14 Injection mechanism part 16 Nozzle touch mechanism part 18 Ball screw 20 Nozzle touch connection member 20a Leg part 20b Coupling part 22 fixation Board support member 24 Machine base 26 Bearing 28 Rail 30a Fixed side mold 30b Movable side mold 32 Fixed board support / nozzle touch connection member 32a Leg 32b Nozzle touch connection part 32c Fixed board support

Claims (2)

In an injection molding machine that injects a molten material from the tip of a nozzle into a fixed plate and a mold fixed to the movable plate,
A nozzle touch mechanism that presses the nozzle against a fixed mold;
A stationary platen support member that supports the stationary platen at the center in the vertical direction of the stationary platen;
A nozzle touch connecting member that connects the center portion and the nozzle touch mechanism portion;
An injection molding machine provided with a nozzle touch mechanism, wherein a nozzle touch force that pushes a fixed mold by the nozzle is transmitted to the nozzle touch mechanism through the nozzle touch coupling member.   The injection molding machine having a nozzle touch mechanism according to claim 1, wherein the fixed plate support member and the nozzle touch connecting member are integrally formed.

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