JP4942088B2 - Two-material injection molding machine and control method - Google Patents

Description

The present invention provides two cavities formed by a movable die plate mold, a fixed die plate mold, and molds on both sides of a rotating die plate installed between the two die plates. The present invention relates to a two-material molding injection molding machine that injects different types of resin from a set of injection units, rotates a rotary die plate 180 degrees and injects two layers, and integrally molds the two materials. In particular, a movable die plate and a rotary die plate The present invention relates to a two-material molding injection molding machine provided with a moving means that can be easily controlled, and a rotating means that is easy to control the rotational speed of a rotary die plate, and a method for controlling the moving speed and rotational speed.

One example of a molding method for obtaining molded products of different materials and different colors using an injection molding machine is to injection-mold one resin material into a primary mold and place the primary molded article into a secondary mold. The other resin material is injection-molded in the gap between the secondary mold cavity and the primary molded product.

With respect to such a molding apparatus, the conventional example shown in Patent Document 1 will be described. From two sets of injection units, both sides of a rotating plate installed between a movable plate mold, a fixed plate mold, and both plates. One resin material is injection-molded on the primary side of the two cavities formed with the mold of the mold, and the rotating plate is rotated 180 degrees, and the other resin material is injected into the secondary-side cavity to integrally mold the two materials. In a two-material molding injection molding machine, the rotation of the rotating plate is a unique hydraulic cylinder, and the opening and closing of the movable platen is performed by the ram and fixed platen at the end of the tie bar provided through the movable platen, rotary platen, and fixed platen. The rotation of the rotating disk is performed by an unspecified rotation driving means. Clamping after the movable platen, rotary platen and fixed platen are closed is performed by a mold clamping cylinder consisting of a large-diameter hydraulic cylinder built in the fixed platen and a ram that can slide in the cylinder. The large-diameter ram has a function of being detachable from the tie bar.

  The molding operation by this injection molding machine is to close the mold by pulling the rotating plate toward the fixed platen with its own hydraulic cylinder and moving the movable plate to the fixed platen side with the hydraulic cylinder provided between the end of the tie bar and the fixed platen. Then, the movable cylinder and the rotating disk are tightened together with the above-mentioned mold clamping cylinder, the hydraulic oil is pressurized, one resin material is injection-molded from one injection unit into the primary cavity, and the rotating disk is inverted 180 degrees. Then, the movable platen and the rotating plate are fastened together, and the other resin material is injected from another injection unit into the secondary cavity to integrally form the two materials.

The conventional multi-material injection molding machine shown in Patent Document 2 is a multi-material molding using a mold comprising a fixed mold, a movable mold, and a rotating mold that rotates between the fixed mold and the movable mold. A first injection device for injecting a molten material into the fixed mold, a second injection device for injecting a molten material into the movable mold, and the rotary mold being rotatable and movable side And a rotation type support device that is supported by a fixed plate and a compression means that clamps the fixed type and the movable type with the rotation type interposed therebetween.
The molding action of this injection molding machine is almost the same as that of the injection molding machine of Patent Document 1.

Japanese Patent Publication No. 3-51207 (Fig. 1) JP 2006-168223 A (FIG. 1)

  In the conventional example of Patent Document 1, the movable plate and the rotating plate are opened and closed by a hydraulic cylinder. However, because the platen is heavy, a high-accuracy speed corresponding to the temperature change of the operating hydraulic fluid. It is difficult to control the position of the mold, and the mold may be damaged if the mold is opened and closed at a high speed. In addition, if the mold opening and closing of the movable platen and the mold opening and closing of the rotating plate are operated in parallel in a hydraulic system that shares the hydraulic pump, the flow rate of the hydraulic oil supplied to each mold opening and closing hydraulic cylinder is not stable and the operation is Since there is a risk of variation, it is not easy to speed up the mold opening and closing operation by the hydraulic cylinder. Although there is no mention of the rotation driving means of the rotating disk, the rotating disk is also heavy and has a large rotational moment, and therefore, there is the same problem as described above when a hydraulic cylinder or a hydraulic motor is used.

  The conventional example of Patent Document 2 is a drive means that uses a hydraulic cylinder as the driving means for moving the mold as in the conventional example of Patent Document 1. Instead of the hydraulic drive, a linear moving means using a servo motor and a ball screw. The rotating means can also be used, but in the description of the embodiment, it is hydraulically driven. In addition, the rotary type is supported by a member extended from the fixed plate so that it can be rotated and moved to the movable type side. However, since it is a cantilever member, it is not a structure that can provide sufficient rigidity. It is difficult to support a large rotating type with high accuracy without bending. Since a rotating disk is added between the strokes of the fixed plate and the movable plate of the existing molding machine, it is difficult to obtain a sufficient moving stroke of the moving plate and the rotating plate for the rotation operation of a wide rotation type. is there. In addition, the members extended from the stationary platen that supports the rotation type are separate upper and lower bodies and must be assembled separately to the stationary platen, and it is difficult to make the upper and lower rotation center axes concentric. There is a possibility that problems such as galling or wear of the bearing portion may occur during rotation of the rotary type. Furthermore, in order to reduce the weight of the rotating mold, the double-sided mold and the mold rotating shaft are integrated, so that it is not easy to replace the mold.

To solve the above problems, the present invention provides a rotary mold plate that can be replaced with a standard mold, a movable platen, and a mold platen drive means capable of stable and stable operation even during high-speed operation of mold opening and closing of the rotary platen. The purpose is to provide.

The present invention solves the above problems by the following means.
(1) The first-part injection molding machine for two-material molding is movable in the same direction as the movable die plate between the movable die plate with the movable die attached and the fixed die plate with the fixed die attached. A reversing table installed on the reversing table and a mold that can rotate 180 degrees about the vertical center axis on the reversing table and that fits the movable mold and the fixed mold on both sides to form a cavity. Rotating die plate, movable die plate opening / closing means for opening / closing movable die plate, rotating die plate opening / closing means for opening / closing rotating die plate, movable die plate, fixed die plate and rotating die after mold is closed In a two-material molding injection molding machine having mold clamping means for simultaneously clamping a plate and two sets of injection units for plasticizing and filling different resin materials,

The mold clamping means is a hydraulic mold clamping means for simultaneously clamping the movable die plate, the fixed die plate, and the rotating die plate , and the movable die plate opening / closing means is a movable die plate opening / closing means driven by the first electric motor, The rotating die plate opening / closing means is a rotating die plate opening / closing means driven by a second electric motor, and the rotating means of the rotating die plate is a rotation driving means driven by a third electric motor attached to the reversing base. It is characterized by that.

(2) The two-member molding injection molding machine of the second means is the two-member molding injection molding machine of the first means, wherein the hydraulic clamping means includes a plurality of hydraulic cylinder devices built in the fixed die plate; A plurality of grooved tie bars connected to the ram of the cylinder device so as to be able to penetrate the rotary die plate and the movable die plate, and a split nut provided outside the movable die plate and capable of engaging with the groove of the tie bar Hydraulic mold clamping means for clamping a movable die plate, a fixed die plate, and a rotating die plate at the same time,

The movable die plate opening / closing means is a movable die plate opening / closing means comprising a ball screw shaft driven by a first electric motor and a ball screw nut screwed to the ball screw shaft attached to the movable die plate. The opening / closing means is a rotating die plate opening / closing means by a ball screw shaft driven by a second electric motor and a ball screw nut screwed to the ball screw shaft attached to the reversing base. A small gear provided on the output shaft of the third electric motor installed on the reversing table with a horizontal large gear provided on a rotating die plate installed on the vertical center axis of the reversing table so that it can be rotated forward and backward by 180 degrees. It is the rotation drive means which drives by.

(3) The injection molding machine for molding a two-material molding of the third means is the injection molding machine for molding the two-material molding of the first or second means, wherein the movable die plate opening / closing means is fixed to a fixed die plate or a base. The ball screw shaft is driven by the first electric motor, and the ball screw nut is screwed onto the ball screw shaft attached to the movable die plate.

(4) The four-member injection molding machine according to the fourth means is the first or second means molding injection molding machine according to the first or second means, wherein the movable die plate opening / closing means is fixed to the reversing base . A ball screw shaft that is driven by an electric motor and supported by a support base fixed to a reversing base and rotatably supported by a ball bearing via a ball bearing; and the ball screw shaft fixed to a movable die plate; It consists of a ball screw nut to be screwed together.

(5) The injection molding machine for forming a two-material molding of the fifth means is an injection molding machine for molding the two-material molding of any one of the first to fourth means. A horizontal large gear mounted on a rotating die plate that can be rotated 180 degrees around the central axis of the motor is driven by a third electric motor installed on a reversing base via a toothed belt or a chain and a small gear. It is characterized by that.

(6) A six-member injection molding machine for forming a two-material molding is an injection molding machine for molding a two-material molding of any of the first to fourth means, wherein the rotating means of the rotary die plate is attached to a reversing table. The rotating die plate is directly driven by a third electric motor that rotates the rotating die plate by 180 degrees.

(7) A seven-part injection molding machine according to the seventh means is a two-part injection molding machine according to any one of the first to sixth means, wherein one set of two injection units is injected. The unit is installed on the fixed die plate side and used for resin injection into the fixed die. The other set of injection units is installed on the movable die plate side and used for resin injection into the movable die. In some cases, the movable die plate moves as the movable die plate moves.
(8) An injection molding machine for two-material molding of the eighth means is connected and fixed to the movable die plate via a connection fixing member in the injection molding machine for two-material molding of the seventh means. A sliding base that can follow the movement is further provided, and another set of injection units is slidably mounted on the sliding base.
(9) The ninth means of the two-member molding injection molding machine is movable in the same direction as the movable die plate between the movable die plate with the movable die attached and the fixed die plate with the fixed die attached. A reversing table installed on the reversing table, a rotating die plate mounted with a mold that can rotate 180 degrees on the reversing table and that is fitted on both sides with a movable mold and a fixed mold to form a cavity, and movable A movable die plate opening / closing means for opening and closing the die plate, a rotating die plate opening / closing means for opening and closing the rotating die plate, and a movable die plate, a fixed die plate and a rotating die plate are simultaneously clamped after the mold is closed. An injection molding machine for two-material molding having mold clamping means and two sets of injection units for plasticizing and filling different resin materials. In this two-material injection molding machine, the mold clamping means is a hydraulic mold clamping means for simultaneously clamping the movable die plate, the fixed die plate, and the rotating die plate, and the movable die plate opening / closing means is driven by the first electric motor. Movable die plate opening / closing means, the rotating die plate opening / closing means is rotating die plate opening / closing means driven by the second electric motor, and the rotating means of the rotating die plate is a third electric motor attached to the reversing base. Rotation driving means driven by a motor. One of the two injection units is installed on the fixed die plate side and used for resin injection into the fixed mold, and the other set of injection units is on the movable die plate side. It is an injection unit that is installed and used for resin injection into the movable mold and moves with the movement of the movable die plate during operation. It is connected and fixed to the movable die plate via a connection fixing member, and the operation of the movable die plate And the other set of injection units is placed on the sliding base so as to be slidable.

( 10 ) The injection molding machine for two-material molding of the tenth means is the same as the injection molding machine for molding the two-material molding of any one of the first to ninth means. Positioning pins that contact with the limit are provided on the reversing table, and the positioning pins protrude so that the rotary die plate reaches a position opposite to the opposing die plate at the position where the rotation limit reaches one rotation limit. It is characterized by that.

( 11 ) An eleventh means for controlling a two-material molding injection molding machine uses the two-material molding injection molding machine according to any one of the first to tenth means, and a movable die plate and an inversion table mold. In the molding process of closing, mold clamping, molten resin injection filling, cooling, mold opening movement of movable die plate and reversing table, 180 degree rotation of rotating die plate, remolding of movable die plate and reversing table, mold clamping A control device programmed with an acceleration profile that smoothly activates or decelerates the movable die plate and the reversing table, and the first electric motor and Acceleration, speed maintenance, and deceleration are controlled by a second electric motor.

( 12 ) The control method of the two-member molding injection molding machine of the twelfth means uses the two-material molding injection molding machine of any one of the first to tenth means, and uses the rotating die plate on the reversing table. When rotating 180 degrees, the rotation speed of the rotating die plate is controlled by a third electric motor so that the rotation time can be shortened by a control device programmed with a rotating speed control program capable of adjusting the rotating acceleration or rotating speed of the rotating die plate. Rotational speed maintenance and rotational deceleration are controlled.

( 13 ) The die plate collision preventing method of the thirteenth means is that the movable die plate or the rotating die plate that is moving is stopped in the control method of the two-member molding injection molding machine of the eleventh means. The distance required for the above is used as the collision prevention distance, and the moving tip positions of the movable die plate and the movable die attached to the movable die plate and the rotating die plate and the die attached to the rotating die plate are monitored. i) Relative distance between a rotating die plate or a die attached to the rotating die plate and a fixed die plate or a stationary die attached to the stationary die plate, or (ii) attached to the rotating die plate or the rotating die plate. Automatically move when the relative distance between the movable die and the movable die plate or the movable die attached to the movable die plate enters the collision prevention distance. Decreasing or stopping the approaching die plate, or reducing or stopping the rotation of the rotating die plate to prevent collision when the movable die plate and the rotating die plate are opened and closed. .

( 14 ) The die plate speed control method of the fourteenth means is the control method of the thirteenth two-material molding injection molding machine, wherein the relative distance is set to a movable die plate or a movable side mold and a rotary die plate or Calculate from the moving tip position of each mold attached to the rotary die plate, the rotation angle of the rotary die plate, and the shape and dimension values of the mold attached to each of the movable die plate, fixed die plate, and rotary die plate. It is characterized by that.
( 15 ) The die plate speed control method of the fifteenth means is the control method of the thirteenth or fourteenth injection molding machine for molding a two-material, wherein the rotary die plate moves toward the fixed die plate. The collision prevention distance between the rotating die plate or the die attached to the rotating die plate and the fixed die is calculated by Equation 1, and when the movable die plate moves toward the rotating die plate The collision prevention distance between the movable side mold and the rotating die plate or the mold attached to the rotating die plate is calculated by Formula 2.
Here, Formula 1 is b2-a-L2, Formula 2 is b1-b2-L1, and in Formula 1 and Formula 2, a, b1, b2, L1, and L2 respectively represent the following.
a: The thickness of the fixed mold.
b1: Distance from the die mounting surface of the fixed die plate to the end surface of the movable die.
b2: Distance from the die mounting surface of the fixed die plate to the rotation axis of the rotary die plate.
L1: A distance that is most distant from the rotation axis of the rotary die plate toward the movable die plate in a direction perpendicular to the rotation axis, and a distance that is uniquely determined from the rotation angle of the rotary die plate, and from the rotation axis of the rotary die plate This is the distance in the mold opening / closing direction to the rotating track on the movable die plate side.
L2: a distance that is most distant from the rotation axis of the rotary die plate toward the fixed die plate in a direction perpendicular to the rotation axis and a distance that is uniquely determined from the rotation angle of the rotary die plate, and is fixed from the rotation axis of the rotary die plate This is the distance in the mold opening / closing direction to the rotating track on the die plate side.

The invention according to claims 1 to 10 is an injection molding machine for forming a two-material molding according to the first to tenth means, and the eleventh aspect of the invention according to claims 11 to 15 is used by using this injection molding machine. -The control method of the fifteenth means makes the mold opening and closing motorized, thereby improving the speed accuracy and position accuracy of the movable die plate and the rotary die plate. Can be prevented from being damaged.

In addition, dedicated moving means (ball screw shaft, ball screw nut, servo motor, etc.) are provided for opening and closing the movable die plate and rotating die plate, respectively, so that the movable die plate and rotating die plate can be moved simultaneously. Yes, considering the relative position of the movable die plate and the rotary die plate, each mold can be opened and closed with high precision while linking to the molded product take-out device. Since the reproducibility of the mold position is good, it is possible to avoid chucking mistakes when taking out the molded product.

  In addition, it is possible to smoothly accelerate and decelerate the rotation by rotating the rotating die plate by electric drive, and it is easy to control the vibration at the start of rotation at the time of reverse drive, the vibration at the time of rotation stop, and the control of high-speed rotation. Therefore, even if the opening / closing operation of the movable die plate and the rotating die plate and the rotating operation of the rotating die plate are performed in parallel, the position can be controlled so as to avoid contact and collision, thereby achieving a high molding cycle. Further, the invention according to claim 6 is a rotational driving means that is directly driven by the servo motor of the sixth means, and does not interpose a gear or a belt. Make it more suitable.

Further, the speeding up of the reversal and the shortening of the mold opening and closing time for reversal can shorten the time during which the molded product is exposed to the atmosphere, and can suppress inconveniences associated with the temperature drop of the molded product. When the molded product is exposed to the atmosphere, the surface temperature of the molded product decreases, and the adhesion of the two materials for the two-piece integrated molding decreases. It may be about 40 seconds to 50 seconds, preferably 30 seconds or less. More preferably, it should be 20 seconds or less. In addition, the high-precision control of the rotation stop position has an effect of easily and surely engaging with the positioning pin, and the operation of most of the die plates is electrically driven to improve the cleanliness of the molding apparatus.

(First embodiment)
This embodiment is different in each of the two cavities formed by the mold of the movable die plate, the mold of the fixed die plate, and the molds on both sides of the rotating die plate installed between the two die plates. A two-material molding injection molding machine that injects resin, rotates a rotary die plate 180 degrees, performs double injection, and integrally molds two materials, and moves the movable die plate and the rotary die plate; Electric drive means that is easy to control is provided for driving the rotation.

  A first embodiment will be described with reference to the drawings. 1 is a schematic plan view of a two-material molding injection molding machine according to the present invention, FIG. 2 is a diagram showing a rotational operation of a rotary die plate of the two-material molding injection molding machine of FIG. 1, and FIG. 4 is a side view of the injection molding machine for molding a material, FIG. 4 is a side view of the rotary die plate shown in FIG. 1 taken along the line XX, and FIG. 5 is a two-material molding process by the injection molding machine for molding a two-material molding according to the present invention. FIG. 6 and FIG. 6 are diagrams for explaining a collision preventing method when the die plate of the two-material molding injection molding machine of FIG. 1 is opened and closed.

  The structure of the two-material injection molding machine (10) will be described. In the figure, (1) is a base, and a fixed die plate (2) having a fixed die (4) attached thereto is fixed to one end of the base (1). On the base (1), there are a rotating die plate (9) mounted with rotating dies A (6A) and B (6B) facing the fixed die plate (2), and a movable die (5). The mounted movable die plate (3) is movably mounted. As shown in FIG. 4, the rotating die plate (9) is placed on the reversing table (7) and rotated forward and reverse by 180 degrees from the determined angular position, and the positioning pin (44a) of the positioning device (44) and the hydraulic cylinder By (48), the fixed die plate (2) and the movable die plate (3) are positioned at an angular position facing directly. A reversing base (7) on which the movable die plate (3) and the rotating die plate (9) are mounted is a guide rail fixed on the base (1) via a linear bearing (not shown) on the base (1). Moves guided by (19). The guide rail (19) is preferable for the movable die plate (3) and the reversing table (7) to be guided and moved, but there is no practical problem even if it is a sliding plate.

The rotating die plate (9) has rotating molds A (6A) and B (6B) of the same shape which are fitted to the movable mold (5) and the fixed mold (4) on both sides to form a cavity. It is installed. Two sets of injection units A (11) are injected into the two cavities formed when the fixed die plate (2), the rotating die plate (9), and the movable die plate (3) are simultaneously clamped by the clamping means. Different resin materials from the unit B (12) are plasticized and injection filled.

The injection unit A (11) is installed on the fixed die plate (2) side to the cavity formed by the fixed mold (4) and the rotating mold A (6A) (or the rotating mold B (6B)). The injection unit B (12) is installed on the movable die plate (3) side and the movable mold (5) and the rotating mold B (6B) (or the rotating mold A (6A) are used. ) And injecting the resin into the cavity formed, and at the time of operation, the movable die plate (3) moves with the opening and closing movement. At this time, the injection unit B (12) moves together with the movable die plate (3) for a large stroke, but the injection unit B (12) is connected and fixed to the movable die plate (3) via the connection fixing member (63). Since the sliding base (64) moves while being guided by the guide rail (19), the movable die plate (3) operates. You can follow and move without delay.
Reference numeral 62 denotes a nozzle touch cylinder for the injection unit B (12), which enables the injection unit B (12) to slide on the sliding base 64. Reference numeral 61 denotes a nozzle touch cylinder for the injection unit A (11).

The movable die plate (3), the opening / closing means for the rotating die plate (9) and the rotating means for the rotating die plate (9) will be described. A pair of movable die plate opening / closing means (14) installed symmetrically on both sides of the two-material injection molding machine (10) is a servo motor A (fixed to the base (1) or the fixed die plate (2). 21), a ball screw shaft A (22), and a support base fixed to the base (1) or the fixed die plate (2) and rotatably supporting the ball screw shaft A (22) with its axial direction being restricted. (26), a ball screw nut A (24) screwed to the ball screw (22a) of the ball screw shaft A (22), and a ball screw nut A (24) are attached and fixed to the movable die plate (3). And a power transmission mechanism (23) (gear pulley and toothed belt, gear reducer, etc.) for transmitting the rotational force of the servo motor A (21) to the ball screw shaft A (22). A pair of servo motors A (21 Is tuned operation, the movable die plate (3) can be parallel to the opening and closing movement to the fixed die plate (2).

A pair of rotating die plate opening / closing means (15) installed symmetrically on both sides of the two-material injection molding machine (10) is a servo motor B (fixed to the base (1) or the fixed die plate (2). 31), a ball screw shaft B (32), and a support base fixed to the base (1) or the fixed die plate (2) and rotatably supporting the ball screw shaft B (32) with its axial direction restricted. (34), a ball screw nut B (33) screwed into the ball screw (32a) of the ball screw shaft B (32), and a ball screw nut B (33) are attached and fixed to the reversing base (7). And a power transmission mechanism (36) (gear pulley, toothed belt, gear reducer, etc.) for transmitting the rotational force of the servo motor B (31) to the ball screw shaft B (32). The pair of servo motors B (31) Is, inverted table (7) can be parallel to the opening and closing movement to the fixed die plate (2).

The rotating die plate rotating means (16) rotates in mesh with the servo motor C (41) attached to the turntable (7), the pinion (42) attached to the servo motor C (41), and the pinion (42). The large gear (43) provided integrally with the die plate (9), the position where the rotating die plate (9) faces the fixed die plate (2) (or the movable die plate (3)), and the position Rotation drive means for rotating the rotary die plate (9) constituted by positioning pins (44) positioned at a position rotated by 180 degrees from the first half in the forward and reverse directions. 8 is a lower shaft integral with the rotary die plate (9). The rotary die plate (9) is supported by the lower shaft (8) and can be rotated with respect to the reversing table (7) via a bearing. It has become.

The hydraulic clamping means is provided so as to penetrate through the movable die plate (3), coupled to four hydraulic cylinders (2a) built in the fixed die plate (2) and the ram (18b) of the cylinder (2a). Tie bars (18) with ring grooves (18a) at the four tips, and four sets of split nuts that are provided outside the movable die plate (3) and can be engaged with the ring grooves (18a) of the tie bars (18) ( 17), and is a hydraulic clamping means for clamping the three sets of die plates (2), (9), and (3) simultaneously.

  The two-material injection molding process of the two-material molding injection molding machine (10) is shown in FIG. In the molding process, after the initial mold closing of the rotary die plate (9) and the movable die plate (3) to the fixed die plate (2), the mold is clamped by the hydraulic cylinder (2a), and the rotary mold A ( 6A) and the mold formed by the fixed mold (4) are injected and filled with the resin A melted from the injection unit A (11), the state is maintained for a certain period of time, and the resin A is solidified. As a matter of course, the reversing table (7) on which the movable die plate (3) and the rotating die plate (9) are loaded is moved to open the space between the die plates (2), (9) and (3). After rotating the rotating die plate (9) by 180 degrees, the movable die plate (3) and the rotating die plate (9) are re-closed.

In this molding process after re-molding, the mold was clamped by the hydraulic cylinder (2a), and then melted from the injection unit A (11) into the cavity formed by the rotating mold B (6B) and the stationary mold (4). Resin A is injected and filled, and at the same time, the molten resin B is injected from the injection unit B (12) into the cavity formed by the molded product adhered to the rotating mold A (6A) and the movable mold (5). Filling and forming a two-material molded product with two materials overlapped, holding that state for a certain period of time, cooling, and then waiting for the time for both resin A and B to solidify, the movable die plate (3) and the rotating die The reversing table (7) on which the plate (9) is placed is moved to open the mold, and the space between the die plates (2), (9), (3) is sufficiently opened and attached to the movable mold (5). After removing the two-component molded product outside the machine, rotate the rotating die plate (9) 180 degrees To rolling. The mold closing and molding processes of the movable die plate (3), the rotary die plate (9), and the fixed die plate (2) after this point are repeated from the molding process after the above remolding.

The die plate to which the mold is attached is heavy, and the speed and acceleration must be carefully selected. When a fast moving speed is selected, the acceleration increases, or it takes time to accelerate and a heavy burden is placed on the driving means. In addition, rapid acceleration and deceleration cause vibration. A hydraulic drive means is suitable for a large driving force, but this means is difficult to control the position accurately when moving a heavy object and takes time. Recently, the capacity of a ball screw, which is a precise driving means, has been increased, and this ball screw apparatus has been used as a moving means for a heavy object. A ball screw device driven by a servo motor can easily control the moving speed and stop position of the driven object by program-controlling the rotation speed of the servo motor.

Servo motors and ball screw driving means are used as moving means for the movable die plate (3) and the rotary die plate (9) of the two-material molding injection molding machine (10). Is programmed to a smooth acceleration profile (eg Sin curve), and the speed at which the mold opening and closing movement time of the reversing table (7) carrying the movable die plate (3) and the rotating die plate (9) is minimized Create a speed and position control program to control the servo motor so that it can be adjusted and input so that it can be moved.

The rotational speed control method of the rotating die plate (9) is such that when the rotating die plate (9) on the reversing table (7) is rotated 180 degrees, the rotational speed is controlled by a control device (not shown) so that the shortest rotating time is obtained. Create a rotation speed control program to control the servo motor so that the rotation speed can be set and input.

The anti-collision method between the die plates is the anti-collision distance e (shown in the figure) for the distance required to stop the reversing table (7) on which the movable die plate (3) or the rotating die plate (9) is mounted. And the positions of the fixed die plate (2), the movable die plate (3), and the rotating die plate (9) are monitored, and automatically approach each other when the relative position enters the collision prevention distance e. Decrease or stop the direction to prevent collision when the movable die plate (3) and the rotating die plate (9) are opened and closed.

An example of behavior and collision prevention control of the movable die plate (3) and the rotating die plate (9) when the movable die plate (3) and the rotating die plate (9) are moved and when the rotating die plate (9) is rotated will be described. Then, in FIG. 6, the corner of the rotating die plate (9) that draws a rotating trajectory at a distance r2 that is farthest from the rotating shaft of the rotating die plate (9) to the fixed die plate (2) in the direction perpendicular to the rotating shaft, or The angle c2 of the rotating mold A (6A), the angle of the rotating die plate (9) that draws the rotating trajectory at the distance r1 that is the farthest from the rotating shaft to the movable die plate (3) in the direction perpendicular to the rotating shaft, or the rotating mold Assume that the corner c1 of the mold B (6B) is L2, the distance from the rotation axis of the rotating die plate (9) to c2 is L2, and the distance from the rotation axis of the rotating die plate (9) to c1 is L1. FIG. 6 shows the case of the corner c2 of the rotating mold A (6A) and the corner c1 of the rotating mold B (6B). L1 and L2 are the number of fluctuations uniquely determined from the rotation angle of the rotary die plate (9) and the values of r1 and r2. (If the rotating mold A (6A) and the rotating mold B (6B) have the same shape, L1 = L2.)
The thickness of the fixed side mold (4) is a, the distance from the mold mounting surface of the fixed die plate (2) to the rotating shaft of the rotary die plate (9) is b2, and the fixed die plate (2) is mounted on the mold The distance from the surface to the end surface of the movable mold (5) is b1. b1 and b2 are the numbers of fluctuations.

When the rotating mold A (6A) moves toward the stationary mold (4) while rotating, the rotating die plate (9) decelerates or stops when b2-a-L2 = e. . When the movable mold (5) moves toward the rotating mold B (6B) during rotation, the movable die plate (3) decelerates or stops when b1-b2-L1 = e. . When the rotating mold A (6A) moves away from the fixed mold (4) and when the movable mold 5 moves away from the rotating mold B (6B), first, The movable die plate (3) is moved to open the mold, and the rotary die plate (9) is moved to open the mold when the distance between the movable mold 5 and the rotating mold B (6B) exceeds e.

In the above die plate speed control method, when the opening / closing movement of the movable die plate (3) and the rotating die plate (9) and the rotation of the rotating die plate (9) are performed in a lapping manner, the rotation of the rotating die plate (9) is performed. The distance between the rotating die plate (9) and the stationary die plate (2), the rotating die plate (9) and the movable die plate (3) is calculated from the movable die plate position, the rotational die plate position and the rotation angle, When the collision prevention distance e is entered, the one that approaches automatically is decelerated or stopped to prevent the movable die plate (3) and the rotary die plate (9) from being opened and closed, and the collision during rotation of the rotary die plate (9) is prevented. Like that.

By checking the relative distance between the die plates while operating in the actual machine, the movement time of each die plate can be further shortened by reducing the distance.
(Second Embodiment)

This embodiment differs from the first embodiment in that a movable die plate for driving a movable die plate (3) as shown in the schematic plan view of the two-material injection molding machine (30) in FIG. The servo motor A (21) of the opening / closing means (46) and the support base (26) of the ball screw shaft (47) are installed on the reversing base (7), and the rest is the same as in the first embodiment. Since there is, explanation of other composition is omitted.
The advantage of this embodiment is that the ball screw shaft (47) can be shortened, so that the critical speed of the ball screw shaft (4) is improved and the opening / closing speed of the movable die plate (3) can be increased. In addition, since the rotary die plate (9) and the movable die plate (3) are directly connected by a ball screw, the calculation of the relative position between the rotary die plate (9) and the movable die plate (3) is unnecessary, and control is possible. Easy to do.
(Third embodiment)

This embodiment differs from the first embodiment in that the rotating die plate rotating means (50) is attached to the reversing table (7) as shown in the schematic side view of the rotating die plate in FIG. A servo motor C (41), a small gear (53) attached to the servo motor C (41), and a large gear (52) integrally provided on a rotating die plate (9) meshing with the small gear (53); The rotary drive means comprises a small gear (53) and an endless toothed belt (54) wound around a large gear (52), and rotates the rotary die plate (9) halfway in the forward and reverse directions. Other than this, the second embodiment is the same as the first embodiment, and the description of the other configurations is omitted.

Instead of the small gear (53), the large gear (52) and the endless toothed belt (54), the output shaft of the servo motor C (41) has a small diameter chain sprocket, and the rotating die plate (9) has a large diameter. It is also possible to use a chain sprocket or an endless chain wrapped around both chain sprockets.
(Fourth embodiment)

This embodiment differs from the first and second embodiments in that the rotating die plate rotating means (60) has a gear for power transmission as shown in the schematic side view of the rotating die plate in FIG. Direct drive system in which the servo motor D (56) attached to the reversing base (7) is directly connected to the rotating shaft (57) of the base (55) integrated with the rotating die plate (9) without using an endless belt or the like It is that. Since other than this is the same as that of the first embodiment, description of other configurations is omitted.

The direct drive system using the servo motor D (56) has an advantage that the rotating die plate (9) rotates as instructed by the program without gears and belts interposed, and does not cause backlash in operation.

It is a plane schematic diagram of the injection molding machine for two-materials shaping | molding concerning the 1st Embodiment of this invention. It is a figure which shows rotation operation | movement of the rotation die plate of the injection molding machine for two-materials shaping | molding of FIG. FIG. 2 is a side view of the two-material injection molding machine of FIG. 1. It is a XX arrow side view which shows schematic structure of the rotation die plate of FIG. It is a two-material molding process drawing by the injection molding machine for two-material molding of the present invention. It is a figure explaining the collision prevention method at the time of the die-plate opening / closing of the injection molding machine for two-material shaping | molding concerning the 1st Embodiment of this invention. It is a plane schematic diagram of the injection molding machine for two-material molding concerning the 2nd Embodiment of this invention. It is a side view which shows schematic structure of the rotation die plate concerning the 3rd Embodiment of this invention. It is a side view which shows schematic structure of the rotating die plate concerning the 4th Embodiment of this invention.

Explanation of symbols

2 Fixed die plate 3 Movable die plate 4 Fixed die 5 Movable die 6A Rotating die A
6B Rotating mold B
7 Reversing table 9 Rotating die plates 10, 30 Injection molding machine 11 for two-material molding Injection unit A
12 Injection unit B
14, 46 Movable die plate opening / closing means 15 Rotating die plate opening / closing means 16, 50, 60 Rotating die plate rotating means 17 Split nut 18 Tie bar 21 Servo motor A (first electric motor)
22a, 32a, 47a Ball screw 24, 33 Ball screw nut 31 Servo motor B (second electric motor)
41 Servo motor C (Third electric motor)
56 Servo motor D

Claims (15)

A reversing table that is movably installed in the same direction as the movable die plate between a movable die plate to which a movable mold is mounted and a fixed die plate to which a fixed mold is mounted, and a vertical center on the reversing table. a rotary die plate fitted with a mold to form a cavity fitted on both sides can be rotated 180 degrees to the axis in the movable side die and the fixed mold, a movable die for mold opening and closing said movable die plate Plate opening / closing means, rotating die plate opening / closing means for opening / closing the rotating die plate, and mold clamping means for simultaneously clamping the movable die plate, the fixed die plate and the rotating die plate after closing the mold And two-part injection molding machine having two sets of injection units for plasticizing and filling different resin materials,
The mold clamping means is a hydraulic mold clamping means for simultaneously clamping the movable die plate, the fixed die plate, and the rotating die plate;
The movable die plate opening / closing means is movable die plate opening / closing means driven by a first electric motor,
The rotating die plate opening / closing means is rotating die plate opening / closing means driven by a second electric motor,
An injection molding machine for two-material molding, wherein the rotating means of the rotating die plate is rotational driving means driven by a third electric motor attached to the reversing table. In the two-material injection molding machine according to claim 1,
The hydraulic mold clamping means includes a plurality of hydraulic cylinder devices built in the fixed die plate and a plurality of tips coupled to a ram of the cylinder device so as to penetrate the rotating die plate and the movable die plate. Hydraulic pressure that is configured by a grooved tie bar and a split nut that is provided outside the movable die plate and can be engaged with the groove of the tie bar, and clamps the movable die plate, the fixed die plate, and the rotating die plate simultaneously. Mold clamping means,
The movable die plate opening / closing means is a movable die plate opening / closing means by a ball screw shaft driven by the first electric motor and a ball screw nut screwed with the ball screw shaft attached to the movable die plate.
The rotating die plate opening / closing means is a rotating die plate opening / closing means using a ball screw shaft driven by the second electric motor and a ball screw nut screwed to the ball screw shaft attached to the reversing base,
The rotating means of the rotating die plate includes a horizontal large gear provided on the rotating die plate, which is installed on the rotating die plate so as to be able to rotate forward and reverse by 180 degrees on the vertical central axis of the reversing table. An injection molding machine for two-material molding, characterized in that it is a rotational drive means that is driven by a small gear provided on the output shaft of the electric motor 3. In the two-material injection molding machine according to claim 1 or 2,
The movable die plate opening / closing means is screwed with a ball screw shaft driven by the first electric motor fixed to the fixed die plate or a base and the ball screw shaft attached to the movable die plate. An injection molding machine for two-material molding characterized by comprising a ball screw nut. In the two-material injection molding machine according to claim 1 or 2,
The movable die plate opening / closing means is driven by the first electric motor fixed to the reversing table and restrains the axial direction to freely rotate via a ball bearing on a support table fixed to the reversing table. An injection molding machine for two-material molding comprising a supported ball screw shaft and a ball screw nut screwed with the ball screw shaft fixed to the movable die plate. In the injection molding machine for two-material molding according to any one of claims 1 to 4,
The rotating means of the rotating die plate includes a horizontal large gear mounted on the rotating die plate that is rotatably installed at a vertical central axis of the reversing table, a toothed belt, or a chain and a small gear. An injection molding machine for two-material molding, which is driven by the third electric motor installed on the inversion table via In the injection molding machine for two-material molding according to any one of claims 1 to 4,
The two-member molding injection molding machine, wherein the rotating means of the rotating die plate is directly connected by the third electric motor which is attached to the reversing table and rotates the rotating die plate by 180 degrees. In the injection molding machine for two-material molding according to any one of claims 1 to 6,
One set of the two sets of injection units is installed on the fixed die plate side and used for resin injection into the fixed mold, and the other set of injection units is on the movable die plate side. An injection molding machine for two-material molding, wherein the injection molding machine is used for injecting resin into the movable mold and is moved along with the movement of the movable die plate during operation. The two-material injection molding machine according to claim 7,
It further includes a sliding base that is connected and fixed to the movable die plate via a connection fixing member and is capable of following the operation of the movable die plate.
The other set of injection units is mounted on the sliding base so as to be slidable. A reversing table installed so as to be movable in the same direction as the movable die plate between a movable die plate having a movable mold attached thereto and a fixed die plate having a fixed mold attached thereto, and rotated 180 degrees on the reversing table. A rotating die plate having a mold that can be fitted to the movable side mold and the fixed side mold to form a cavity on both sides, and a movable die plate opening / closing means for opening and closing the movable die plate; Rotating die plate opening and closing means for opening and closing the rotating die plate, and mold clamping means for simultaneously clamping the movable die plate, the fixed die plate and the rotating die plate after closing the mold, and different resins In a two-material injection molding machine having two sets of injection units for plasticizing and injection-filling materials,
  The mold clamping means is a hydraulic mold clamping means for simultaneously clamping the movable die plate, the fixed die plate, and the rotating die plate;
  The movable die plate opening / closing means is movable die plate opening / closing means driven by a first electric motor,
  The rotating die plate opening / closing means is rotating die plate opening / closing means driven by a second electric motor,
  The rotating means of the rotating die plate is rotational driving means driven by a third electric motor attached to the reversing table,
  One set of the two sets of injection units is installed on the fixed die plate side and used for resin injection into the fixed mold, and the other set of injection units is on the movable die plate side. It is an injection unit that is installed in and used for resin injection into the movable mold and moves with the movement of the movable die plate during operation.
  It is connected and fixed to the movable die plate via a connection fixing member, and comprises a sliding base that can follow the operation of the movable die plate,
  The other set of injection units is mounted on the sliding base so as to be slidable. In the injection molding machine for two-material molding according to any one of claims 1 to 9 ,
The reversing table is provided with a positioning pin on which the rotating die plate that rotates on the reversing table abuts at its rotation limit, and at the position where the rotating die plate reaches one rotation limit and the return rotation limit position. An injection molding machine for two-material molding, wherein the positioning pin is projected so as to be in a position facing a die plate facing each other. Use of the two-material molding injection molding machine according to any one of claims 1 to 10 , wherein the movable die plate and the inversion table are closed, clamped, molten resin is injected and cooled, and the movable die plate is used. In the mold opening movement of the reversing table, 180 degree rotation of the rotating die plate, remolding of the movable die plate and reversing table, and mold clamping, the movable die plate and the reversing table are accelerated or decelerated. By means of a control device programmed with an acceleration profile that operates smoothly, the first electric motor and the second electric motor can minimize the mold opening and closing movement time of the movable die plate and the reversing table. A control method for an injection molding machine for two-material molding, characterized by controlling acceleration, speed maintenance, and deceleration. When the rotary die plate on the reversing table is rotated 180 degrees using the two-material molding injection molding machine according to any one of claims 1 to 10 , the rotational acceleration or rotational speed of the rotary die plate is determined. The third electric motor controls rotation acceleration, rotation speed maintenance, and rotation deceleration of the rotating die plate by the third electric motor so as to achieve the shortest rotation time by a control device programmed with an adjustable rotation speed control program. Control method for injection molding machine for two-material molding. In the control method of the injection molding machine for two-material molding according to claim 11 ,
The movable die plate and the rotary die attached to the movable die plate and the movable die plate are defined as a collision prevention distance, which is a distance necessary for the moving movable die plate or the rotating die plate to stop. The moving tip position of each of the mold attached to the plate and the rotating die plate is monitored, and (i) the mold attached to the rotating die plate or the rotating die plate and the fixed die plate or the fixed Relative distance between the fixed molds attached to the die plate, or (ii) the mold attached to the rotating die plate or the rotating die plate and the movable die plate or attached to the movable die plate When the relative distance between the movable side molds enters the collision prevention distance, the moving die plate is automatically moved The injection for two-material molding is characterized in that the movable die plate and the rotating die plate are prevented from colliding during opening and closing movements by decelerating or stopping the rotation or decelerating or stopping the rotation of the rotating die plate. Control method of molding machine. In the control method of the injection molding machine for two-material molding according to claim 13 ,
The relative distance is determined by moving the movable die plate or the movable side mold and the rotating die plate or the rotating die plate attached to the rotating die plate to the moving tip position and the rotational angle of the rotating die plate, A control method for an injection molding machine for two-material molding, characterized in that it is calculated from the shape and dimension values of a mold attached to each of a movable die plate, the fixed die plate, and the rotating die plate. In the control method of the injection molding machine for two-material molding according to claim 13 or 14 ,
The collision prevention distance between the rotating die plate or the mold attached to the rotating die plate and the fixed-side mold when the rotating die plate moves toward the fixed die plate. Calculated by 1,
The collision prevention distance between the movable side mold and the rotating die plate or the mold attached to the rotating die plate when the movable die plate moves toward the rotating die plate. 2. A control method for an injection molding machine for molding a two-material molding, wherein
The formula 1 is b2-a-L2, and the formula 2 is b1-b2-L1, and in the formula 1 and the formula 2, a, b1, b2, L1, and L2 respectively represent the following.
a: Thickness of the fixed mold.
b1: Distance from the die mounting surface of the fixed die plate to the end surface of the movable die.
b2: Distance from the die mounting surface of the fixed die plate to the rotation axis of the rotating die plate.
L1: a distance farthest from the rotation axis of the rotary die plate toward the movable die plate in a direction perpendicular to the rotation axis, and a distance uniquely determined from a rotation angle of the rotary die plate, This is the distance in the mold opening / closing direction from the rotation axis to the rotation track on the movable die plate side.
L2: a distance that is uniquely determined from a rotation axis of the rotating die plate and a distance that is farthest from the rotating axis of the rotating die plate toward the fixed die plate in a direction perpendicular to the rotating axis and the rotating angle of the rotating die plate. The distance in the mold opening / closing direction from the shaft to the rotating track on the fixed die plate side.

Images