JP3639903B2 - Electric direct pressure vertical molding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vertical molding machine provided with a direct pressure type clamping device using an electric motor as a drive source.
[0002]
[Problems to be solved by the invention]
A conventional electric saddle molding machine employs a toggle mechanism as a mold clamping device. The toggle mechanism is provided in the machine base, and the toggle link is expanded and contracted by a ball screw shaft that rotates the toggle mechanism by an electric motor and a ball nut member that converts the rotation into a linear motion. The movable platen on the connected machine base is moved up and down with respect to the upper surface of the machine base so that the mold can be clamped.
[0003]
Most vertical molding machines are used for insert molding, but the toggle mechanism has tie bars on the four sides between the machine base and the movable platen, so the side inserts are limited and the lower mold is placed. There is a restriction that the diameter of the turntable is also limited.
[0004]
As a means of solving the restriction by this tie bar, in a vertical molding machine using hydraulic pressure as a drive source, a direct pressure type is adopted as a mold clamping mechanism, and a pair of left and right mold clamping cylinders are provided vertically on the upper part of the movable platen. The piston rod of the tightening cylinder is connected to the movable platen, and the three sides on the machine plate are opened except for the tie bar between the machine platen and the movable platen.
[0005]
Even if the tie bar is omitted, in the clamping cylinder, the piston rod is supported vertically at the lower end and the upper end of the vertical hydraulic cylinder. Even if there is no support of the tie bar, it always moves up and down without swinging, so stable mold clamping accuracy is maintained.
[0006]
Therefore, even when an electric motor is used as the drive source, the toggle mechanism is changed to a direct pressure type that directly presses with the ball screw shaft, and is provided at the upper part of the movable plate as in the case of hydraulic pressure, and the ball screw shaft is connected to the movable plate. Although it is conceivable to omit the tie bar, in the ball screw shaft, there is a clearance around the ball interposed in the threaded portion with the ball nut member, and this clearance causes the ball screw shaft to shake during operation. Although this runout is minute, it affects the mold clamping accuracy, and it is necessary to prevent this runout.
[0007]
Accordingly, an object of the present invention is to adopt a direct pressure type as the mold clamping mechanism and provide a movable platen on the upper part, and even if the tie bar is omitted by connecting the mold clamping ball screw shaft and the movable plate, the mold clamping ball screw shaft It is possible to constrain the run-out, which allows the movable platen to move vertically up and down to maintain stable mold clamping accuracy, and by supporting the injection device on the mold clamping device, The object is to provide a new electric direct pressure vertical molding machine that can be applied to a machine base of a molding machine.
[0008]
[Means for Solving the Problems]
According to the above-mentioned object, the present invention provides a mold clamping system including a pair of left and right housings, a mold clamping ball nut member with pulleys provided vertically in each housing, and a mold clamping drive belt wound around both pulleys. The mold clamping electric motor linked to the ball nut member and a pair of left and right mold clamping ball screw shafts screwed into the upper and lower sides of the respective housing and screwed into the upper and lower sides of the housing. The mold clamping device is constructed by mounting the mold clamping electric motor on the back surface of the support member, and a guide rail vertically installed on the front surface of the support body. And a movable platen that is horizontally connected to the lower ends of the clamping ball screw shafts and an injection device that is inserted downward and supported by a column that is connected to the upper ends of both clamping ball screw shafts. .
[0009]
Further, according to the present invention, a screw shaft for nozzle touch is erected on the movable platen, and a nut member with a pulley provided on the injection device side is screwed to the screw shaft to connect the movable platen and the injection device. It is to become.
[0010]
The support for the machine base of the present invention includes a pair of left and right side plates formed in a C shape by projecting the upper and lower parts in parallel, a front plate integrally formed with the base plate and provided between both side plates on the projecting side, In parallel with the base plate, it consists of a top plate provided between the upper part of the front plate and the side plate. The mold clamping device is attached to the top plate, and the movable plate is attached to the front plate between the top plate and the base plate. It is to become.
[0011]
Further, the base of the machine base includes a pair of left and right side plates on the machine base that protrudes from the upper part and has an inverted L shape, a column member that sews the side plates to the machine base, and both side plates on the protruding side A front plate provided between the top plate and the side plate in parallel with the machine base, and the clamping device is attached to the top plate between the top plate and the machine base. In other words, the movable plate is attached to the front plate.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1, reference numeral 1 denotes a support body having a plate-like frame standing upright on one side of the machine base 2. An electric direct pressure type mold clamping device 3 together with a movable platen 4 is mounted on a front plate 11 facing the machine base 2 of the support body 1. An injection device 5 is provided on the mold clamping device 3 so as to be movable up and down. Reference numeral 6 denotes a screw shaft for nozzle touch provided across the movable platen 4 and the injection device 5.
[0013]
A pair of arms 12 are provided on both sides of the front plate 11, and a disk-shaped housing 31 of the mold clamping device 3 is horizontally attached to the tip thereof. In addition, a pair of linear guide rails 7 of the movable platen 4 having a nozzle hole in the center are vertically arranged on the front plate 11 below both housings 31.
[0014]
Inside each housing 31, a clamping ball nut member 33 having a pulley 32 connected to the upper end is vertically provided by a bearing so as to be rotatable, and is screwed into the clamping ball nut member 33 to clamp the mold. A ball screw shaft 34 extends through each housing 31 so as to be movable up and down. The column 10 of the injection device 5 is integrally connected to the upper ends of both the mold clamping ball screw shafts 34 by connecting the end portions thereof with a connecting plate 10a.
[0015]
On the back of the front plate 11, a mold clamping electric motor 35 by an electric servomotor is mounted upward, and the mold extends over the pulley 35a of the mold clamping electric motor 35 and both pulleys 32 on the mold clamping ball nut member side. The tightening drive belt 36 is wound. As a result, the rotation by the mold clamping electric motor 35 is transmitted to both mold clamping ball nut members 33, and the rotation of the mold clamping ball nut member 33 is converted into the linear motion of the mold clamping ball screw shaft 34. 34 constitutes the mold clamping device 3 that moves up and down.
[0016]
The movable plate is supported horizontally by the front end of the support 1 by fitting the linear guide rail 7 with a sliding member 7a at the rear end at the lower end of the mold clamping ball screw shaft 34 of the mold clamping device 3. 4 is connected. On the lower surface of the movable platen 4, a fixed mold 8a on the upper surface of the machine base and a movable mold 8b for closing the mold are attached. In the example shown in the figure, the fixed mold 8a is installed on the upper surface of the mold table 9 provided on the upper surface of the machine base 2, but the mold table 9 may be a rotating table.
[0017]
The injection device 5 connects the lower plate 52a and the upper plate 52b, which are connected to the base end portion of the heating cylinder 51, with the connecting rods 52c on both sides at a necessary interval, and moves the injection plate 53 to the rod 52c. A drive unit that is freely inserted and configured integrally is provided. A base shaft of an injection screw 54 penetrating the lower plate 52a is rotatably attached to the injection plate 53, and a measuring pulley 55 is attached to the base portion thereof.
[0018]
The upper plate 52b is integrally formed with a bearing member 57 that rotatably supports the shaft portion of the injection ball screw shaft 56, and a pulley 56a is attached to a shaft end protruding on the bearing member. An injection drive belt 56b is wound around the pulley 56a and a pulley 58a at the drive shaft end of an injection electric motor 58 by an electric servo motor attached to the connecting plate 10a.
[0019]
The screw shaft of the injection ball screw shaft 56 protrudes long downward from the bearing member 57 and is screwed with the injection ball nut member 59 at the upper portion of the injection plate located at the lower end thereof, and the injection ball is rotated by rotation of the screw shaft at a fixed position. The injection plate 53, together with the nut member 59, moves downward using the connecting rod 52c as a guide, and depending on the rotational direction, it has a normal structure for injecting or metering resin.
[0020]
The injection device 5 includes a support cylinder 10b provided at both ends of the upper and lower plates 52a and 52b through the support column 10 of the mold clamping ball screw shaft 34, and a nozzle that can be moved up and down above the mold clamping device 3. Are attached to the movable platen 4 so as to be movable up and down by the nozzle shaft 6 for nozzle touch.
[0021]
The screw shaft 6 for nozzle touch has a lower end fixed to a pedestal 41 projecting from the center of the upper surface of the movable platen 4, and is erected up to the upper side of the lower plate 52a of the injection device 5, and its upper end is a lower portion. The nut 52 is rotatably engaged with the plate 52a. A pulley 61 a is attached to the upper end of the nut member 61. A drive belt is wound around the pulley 61a and the pulley 62a of the nozzle touch gear motor 62 fixed on the lower plate 62a, and the rotation of the gear motor 62 is transmitted to the nut member 61. The injection device 5 moves up and down with respect to the movable platen 4 using the shaft 6 as a guide, and nozzle touches a gate (not shown) of the movable mold 8b.
[0022]
FIG. 4 and subsequent figures show a machine base equipped with a support body according to another embodiment. The support body 100 of FIGS. 4 and 5 is a pair of left and right side plates 101 formed in a C shape with upper and lower portions protruding in parallel. And a front plate 103 integrally formed with the base plate 102 and provided between the protruding side plates, and an upper surface plate 105 provided between the front plate 103 and the upper side plate 104 in parallel with the base plate 103, The mold clamping device 3 is attached to the upper plate 105, and the movable plate 4 is attached to the front plate 103 between the upper plate 105 and the base plate.
[0023]
Further, the support 110 shown in FIG. 6 includes a pair of left and right side plates 111 on the machine base 2 projecting from the upper part and formed in an inverted L shape, and a column member 112 for sewing the side plates 111 to the machine base 2. The front plate 113 provided between the two side plates on the protruding side and the upper plate 115 provided between the front plate 113 and the upper side plate 114 in parallel with the machine base 2. The movable platen 4 is attached to the front plate 113 between the upper plate 115 and the machine base 2.
[0024]
In any of the embodiments shown in FIG. 4 and subsequent figures, the injection device 3 and the movable platen 4 are omitted in the drawing, but, as in the embodiments shown in FIGS. In some cases, a screw shaft is extended to an upper end (not shown) of the support column 10, and a nut member 61 with a pulley 61a at the end of the lower plate 52a shown in FIG. 2 is provided on this screw shaft, and a nozzle member is provided at the end of the upper plate 52b. The nozzle touch device is limited to the structure shown in FIG. 2 because it can be screwed together with the gear motor 62 for touching and the electric belt, and the injection device 3 can be supported by the support column 10 by the screwing. Not.
[0025]
In the above configuration, the mold clamping device using an electric motor as the drive source is attached to the support and installed at the top of the machine base, so the machine base height can be set to a work position that fits insert molding, improving efficiency. It becomes. Since the tie bar that supports the movable plate is not required, the three sides on the machine base can be opened, and the vertical movement of the movable plate is supported by the support on the machine base with a guide rail. Even if it is an electric direct pressure type that clamps by clamping to the mold, it is possible to restrain the deflection of the clamped ball screw shaft, thereby preventing side shake and moving the movable plate vertically up and down, which is always stable The mold clamping accuracy can be maintained.
[0026]
Furthermore, the movable platen and the injection device are connected by a screw shaft for nozzle touch, and the vertical movement of the movable plate by the clamping ball screw shaft and the vertical movement of the injection device by the screw shaft for nozzle touch are performed in parallel. If it is possible to perform nozzle touch after mold clamping from mold closing, it is possible to inject the mold clamping device if it has a front plate facing the machine base as a support. Since it can be attached in association with the apparatus, it has an advantage that the machine base of the conventional hydraulic direct pressure vertical molding machine can be adopted as the machine base of the electric direct pressure vertical molding machine.
[Brief description of the drawings]
FIG. 1 is a front view of an electric direct pressure vertical molding machine according to the present invention when the mold is opened.
FIG. 2 is a side view in which a support is vertically cut during mold clamping.
FIG. 3 is a sectional view taken along line AA in FIG. 2;
FIG. 4 is a front view of a machine base including a support according to another embodiment.
FIG. 5 is a side view of the above.
FIG. 6 is a side view of a machine base including the support according to the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Support body 2 Machine stand 3 Clamping device 4 Movable board 5 Injection apparatus 6 Screw shaft for nozzle touch 7 Linear guide rail 7a of movable board Sliding member 10 Post 10a of injection apparatus Support cylinder 11 Front plate 12 Arm 31 Housing 32 Pulley 33 Clamping ball nut member 34 Clamping ball screw shaft 35 Clamping electric motor 36 Clamping drive belt 52a Lower plate 52b of injection device Upper plate 61 of injection device Nut member 61a for nozzle touch Pulley 62 of mold clamping nut member Gear motor for nozzle touch

Claims (4)

A pair of left and right housings, a mold clamping ball nut member with a pulley provided vertically in each housing, and a mold linked to the mold clamping ball nut member via a mold clamping drive belt wound around both pulleys A clamping electric motor and a pair of left and right clamping ball screw shafts screwed into the upper and lower sides of each housing and screwed with a clamping ball nut member, respectively, A mold clamping device configured to be provided on both sides of the front surface, and to be configured by attaching the mold clamping electric motor to the back surface of the support member;
A movable plate that has a back attached to a guide rail vertically provided on the front surface of the support and is horizontally connected to the lower end of the clamping ball screw shaft;
An electric direct pressure vertical molding machine characterized by comprising an injection device that is inserted downward and supported by a column that is connected to the upper ends of both mold clamping ball screw shafts. A nozzle shaft for nozzle touch is erected on the movable plate, a nut member with a pulley provided on the injection device side is screwed to the screw shaft, and the movable plate and the injection device are connected. The electric direct pressure vertical molding machine according to claim 1. The support body includes a pair of left and right side plates that are formed in a C shape by projecting the upper and lower portions in parallel, a front plate that is integrally formed with the base plate and provided between both side plates on the projecting side, and a front plate that is in parallel with the base plate. The upper plate is provided between the face plate and the upper side plate, the mold clamping device is attached to the upper plate, and the movable plate is attached to the front plate between the upper plate and the base plate. The electric direct pressure vertical molding machine according to claim 1 or 2. The support body is provided between a pair of left and right side plates on a machine base that protrudes from the upper part and has an inverted L shape, a column member that sews the side plates to the machine base, and both side plates on the protruding side. It consists of a front plate and a top plate provided between the front plate and the upper side plate in parallel with the machine base. The mold clamping device is attached to the top plate and the movable plate is moved to the front plate between the top plate and the machine base. The electric direct pressure vertical molding machine according to claim 1 or 2, wherein a board is attached.

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