JPH05200820A - Horizontal injection compression molding equipment - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a horizontal injection compression molding apparatus,
In particular, it relates to a horizontal injection compression molding apparatus that starts supplying a plastic material when a mold is opened at a predetermined interval. A fixed die plate for holding a fixed die and a movable die plate for holding a movable die, which are arranged vertically to the ground, and an advancing / retreating means for moving the moving die plate forward / backward with respect to the fixed die plate. A mold clamping means for clamping the mold while the movable die plate approaches the fixed die plate and reaches a predetermined position, and the movable die plate advances the fixed die plate to compress and spread the plastic material. It consists of a molding device and an injection device that opens the flow control valve after the movable die plate approaches the fixed die plate and reaches a predetermined position and supplies the plastic material to the compression molding device. Further, it comprises a carry-out device for carrying out the molded product vertically to the ground from between the fixed die plate holding the fixed die vertically arranged on the ground and the moving die plate holding the moving die.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal injection compression molding apparatus, and more particularly to a horizontal injection compression molding apparatus that starts supplying a plastic material when a mold is opened at a predetermined interval.

[0002]

2. Description of the Related Art In recent years, as the size of injection molding machines has increased, the mold clamping device is required to have a strong mold clamping force. On the other hand, it is required to improve the operating speed due to the demand for productivity improvement, and the mold clamping device is required to be installed due to its large size. Reducing space is also an important need. Therefore, the mold opening and closing is advanced and retracted at a high speed by a small diameter long cylinder while the driving force is low, and the mold clamping reaction force is locked when both molds are close to each other, and the large diameter short cylinder strongly clamps the mold. Method (for example, JP-A-1-
Applications such as 232005) are becoming mainstream. Also,
Similarly, as the size of the molded product increases, a method of molding using a vertical press machine ((for example, Japanese Patent Publication No. 3-688
0, Japanese Patent Application Laid-Open No. 2-172711).

[0003]

However, in the above-mentioned conventional Japanese Patent Laid-Open No. 1-232005, the mold clamping device is used in the injection molding machine, and therefore, when molding a large-sized molded product, a corner in the cavity portion is formed. An injection pressure of several thousand and several hundred kilograms is required to supply each resin, which makes the mold clamping device that receives a reaction force very large.

Similarly, Japanese Patent Publication No. 3-6880 is also the same. For this reason, a compression molding device has been proposed in which a vertical press device is used to perform low pressure during injection. However, if the press device and the injection device are lined up, the installation area becomes wider and the overall height of the machine becomes higher. Further, in the vertical type press device, compared to the horizontal type, a crane or the like cannot be used for exchanging the mold, and the unloading device becomes complicated, and the number of steps is also increased. In addition, conventional equipment cannot be used to carry out molded products, the installation area and operating area of the robot are widened, and it is complicated to carry out molded products because it is necessary to use both ends of the molded product. There is the problem of becoming difficult.

In view of the above problems, the present invention relates to a horizontal injection compression molding apparatus, and in particular, provides an improvement of a horizontal injection compression molding apparatus that starts supplying a plastic material when a mold is opened at a predetermined interval. The purpose is to

[0006]

According to a first aspect of the present invention, a fixed die plate for holding a fixed die and a movable die plate for holding a movable die, which are arranged perpendicularly to the ground, and the movement. An advancing / retreating means for promptly moving the die plate back and forth with respect to the fixed die plate, and after the moving die plate approaches the fixed die plate and reaches a predetermined position, the moving die plate moves forward with respect to the fixed die plate to compress the plastic material.・ Compression molding device consisting of mold clamping means that performs mold clamping while spreading, and when the moving die plate approaches the fixed die plate and reaches a predetermined position, opens the flow control valve and supplies plastic material to the compression molding device. And an injection device.

In the second invention, which is mainly based on the first invention, molding is carried out between a fixed die plate for holding a fixed die and a movable die plate for holding a movable die which are vertically arranged on the ground. And an unloading device for unloading the product vertically to the ground.

Further, in the third invention, a fixed die plate for holding the fixed die, a movable die plate for holding the movable die, and an advancing / retreating means for rapidly moving the movable die plate back and forth with respect to the fixed die plate. And compression molding comprising locking means for locking the movable die plate to the tie bar at a position where the movable die plate approaches the fixed die plate, and mold clamping means for performing mold clamping after the movable die plate is locked to the tie bar. In an injection compression molding apparatus comprising an apparatus and an injection apparatus for supplying a plastic material to a cavity portion of a fixed mold and a movable mold, a fixed mold and a movable mold arranged perpendicular to the ground are opened at a predetermined interval. When the injection device starts to supply the plastic material to the cavity, and when a predetermined amount is supplied, the moving mold moves forward or backward with respect to the fixed mold and plasticizes. The compression-spread.

[0009]

According to the above construction, after the movable die plate approaches the fixed die plate and reaches the predetermined position, that is, after the die attached to the die plate is opened in advance by a predetermined amount and the cavity portion is taken large. Since the plastic material is injected into this large cavity portion from the injection device, the injection pressure can be low. Next, the mold is closed at a predetermined speed and pressure while injecting the plastic, and the plastic is compressed and spread. As a result, the plastic material is compressed and spread in the wide cavity and flows, so that the fluidity can be supplemented and the molding can be performed without impairing the physical properties of the material. In addition, since the pressure applied to the plastic is uniform and the density is uniform, it is possible to perform molding with less distortion and warpage. In this way, by adding press molding while injection molding, it is possible to form a material having poor fluidity and thin-wall molding.

Further, since the horizontal type compression molding apparatus is used, the overall height becomes low, and since the molded product can be carried out vertically from above or in the lateral direction, the carrying-out apparatus of the conventional injection molding machine can be used, and The robot can be used easily. Furthermore, when the press device, the injection device, and the carry-out device are arranged side by side, the space of the press device or the injection device can be used, so that the operating area of the robot is reduced and the installation area can be reduced. Also, since the crane can be used for exchanging the mold, the number of steps can be reduced. Further, the conventional apparatus can be used for carrying out the molded product, the installation area and operating area of the robot can be widened, and the molded product can be easily gripped for carrying out, so that the robot can be easily used.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 5 show one embodiment of the horizontal injection compression molding apparatus of the present invention, FIG. 1 is a front view of the horizontal injection compression molding apparatus, and FIG. 2 is a WW sectional view of FIG.

In FIG. 1, a horizontal injection compression molding device 1 comprises a compression molding device 2, an injection device 3 and a control device 4 (shown in FIG. 5). A discharge device 5 shown in FIG. 2 is arranged near the compression molding device 2. The compression molding apparatus 2 includes a fixed die plate portion 10 that holds a fixed die vertically disposed on the ground, a moving die plate portion 20 that holds a moving die, and the moving die plate quickly with respect to the fixed die plate. An advancing / retreating device 30 for advancing / retreating, a locking device 40 for locking the moving die plate to the tie bar at a position where the moving die plate approaches the fixed die plate, and a moving die plate approaching the fixed die plate to a predetermined position. After reaching the moving die plate, the moving die plate moves forward with respect to the fixed die plate, and the die clamping device 50 performs the die clamping while compressing and spreading the plastic material. Further, the injection device 3 is an injection cylinder part 70 for injecting a plastic material into the compression molding device 2.
And a flow control valve unit 80 for controlling the injection flow rate of the plastic material, the injection start time, and the like. Further, the control device 4 controls the start timing of compression / spreading of the plastic material of the compression molding device 2 and the injection start timing of the injection device 3 which will be described later.

1 and 2, the horizontal compression molding device 2 is shown.
, A fixed die plate portion 10 is fixedly installed on one end of a bed 7 arranged parallel to the ground 6, and the fixed die plate portion 10 includes a fixed die 11 and a fixed die plate holding the fixed die 11. It consists of 12. Further, the fixed die plate portion 10 is provided with a mounting portion for the advancing / retreating device 30 and a mold clamping device 50. In addition, the bed 7 has a guide rail 8
Is fixed to the guide rail 8, and a movable die plate portion 20 standing upright on the ground is fixed to the guide rail 8. The movable die plate portion 20 includes a movable die 21 and a movable die plate 22 that holds the movable die 21. And a linear guide bearing 23 that holds the movable die plate 22, and the linear guide bearing 23 is slidably and pivotally attached to the guide rail 8. In addition, the moving die plate section 20 includes
The locking device 40, an ejector device 110 (not shown), and a mounting portion for the advancing / retreating device 30 are provided. Further, at the other end of the bed 7, a support plate 9 for slidably guiding a tie bar 51 described later is fixedly installed. Fixed die plate 1
A tie bar 51 of a mold clamping device 50, which guides the movable die plate 22 in a slidable manner and pulls the movable die plate 22 at the time of mold clamping, is provided at the position 2. further,
A cylinder 71 (hereinafter, referred to as a heating cylinder 71) that heats the plastic material of the injection device 3 that injects a plastic material such as a resin into the cavity 90 contacts the fixed mold 11 at approximately the center of the fixed die plate 12. A hole 12a for contact is provided. The moving die plate 22 includes a linear bearing 52 that slidably rolls the moving die plate 22 on the tie bar 51, and the moving die plate 22 on the tie bar 51.
A locking device 40 for locking the is fixed.

FIG. 3 is an enlarged view of the mold clamping device 50 mounted on the fixed die plate 12 shown in FIG. Mold clamping device 50
A plurality of hydraulic cylinder chambers 52 on the fixed die plate 12.
Has been abraded, and the piston 53
(Hereinafter, referred to as piston 53) is inserted in a pivotal manner, and a piston cover 54 is further inserted, and the piston cover 54 is fixed to the fixed die plate 12 to form cylinder chambers 52a and 52b. A mold clamping cylinder 55 is composed of the above configuration, the hydraulic cylinder chamber 52, the piston 53, the piston cover 54, and a plurality of mold clamping cylinders in the vicinity of the outer peripheral portion of the fixed die plate 12 (in this example, the most suitable mold clamping device is used. The fixed die plate 12 has four corners, one for each and a total of four.
In the hollow hole 53a of the piston 53 of the mold clamping cylinder 55,
One end is finely cut and the tie bar 51 is inserted into the loose fitting, and the piston 53 has one end portion with the stepped portion 5 of the tie bar 51.
The other end is in contact with the nut 56 screwed to the tie bar 51. The nut 56 is lightly tightened and positioned on the piston 53 so that the tie bar 51 moves vertically with respect to the piston 53 and aligns with the piston 53, and is fixed by a set screw or the like not shown so as not to rotate.

FIG. 4 is an enlarged view of the locking device 40 mounted on the movable die plate 22 shown in FIG. Holes 22a are formed in the four corners of the moving die plate 22,
2a includes a locking device 40 and a movable die plate 2 which will be described later.
2 are provided with linear bearings 52a and 52b which slidably move in the left-right direction in the figure. The fixed die plate 12 and the movable die plate 22 are connected by an advancing / retreating device 30 that promptly advances / retreats. Advance device 3
No. 0 mold opening / closing hydraulic cylinder 31 is slidably connected to the moving die plate 22 on the rod side by the pin 32 and on the fixed die plate 12 by the pin 33 so that the die opening / closing hydraulic cylinder 31 expands / contracts to move the moving die. The plate portion 20 drives the fixed die plate 12 to move back and forth. In addition, the fixed die plate 12 and the movable die plate 2
A distance sensor 100 (shown in FIG. 5) for detecting the distance between the fixed die plate 12 and the moving die plate 22 in the left-right direction is arranged between the two. The distance sensor 100 may measure the positional relationship between the guide rail 8 and the linear guide bearing 23, and the controller 4 may calculate the lateral distance of the movable die plate 22 with respect to the fixed die plate 12 in the drawing. A linear guide bearing 23 that slides on the rolling guide surface of the guide rail 8 fixed to the upper surface of the bed 7 is disposed below the movable die plate 22 in the figure.

FIG. 4 also shows a partially enlarged view of the locking device 40. A hydraulic fastening machine 41 (for example, a hydraulic fastening machine manufactured by Nitomac Earl Co., Ltd.) is fitted into the hole 22a of the movable die plate 22, and the bottom 22b of the storage hole is fixed so as not to move in the axial direction of the tie bar 51. Bearing retainer 4
It is locked by 2. The bearing retainer 42 is fixed to the moving die plate 22 with a bolt (not shown). Linear bearings 52a and 52b are arranged inside the bearing retainer 42 and inside the moving die plate 22 on the opposite side of the bearing retainer 42 so that the fulcrum is long, and the moving die plate portion 20 uses the tie bar 51 as a guide. The tie bar 5 by the mold opening / closing hydraulic cylinder 31
1. Sliding smoothly in the axial direction.

As shown in FIG. 5, the injection cylinder portion 70 of the injection device 3 has a slider 79 fixed to a heating cylinder 71.
The fixed mold 11 of the compression molding device 2 is shown in FIG.
It is mounted so that it can slide in any direction. Injection cylinder part 70
A screw 72 is closely inserted into the heating cylinder 71 of No. 2, and the screw 72 is connected to a hydraulic cylinder 73 via a bracket 74. By driving the hydraulic cylinder 73, the screw 72 slides in the Z direction to remove the plastic material. To eject. Further, the injection amount of the plastic material to be injected is obtained, for example, by measuring the stroke of the hydraulic cylinder 73 with the distance sensor 75 and calculating with the control device 4. Further, a flow control valve unit 80 for controlling the injection flow rate of the plastic material, the injection start time, and the like is arranged at the tip of the heating cylinder 71 of the injection cylinder unit 70. The flow control valve unit 80 includes a valve 81 pivotally inserted into a spool hole provided in the heating cylinder 71, and the valve 81 connected to the rod 8.
2. A step motor 84 that swings via a lever 83.

The control device 4 includes a fixed mold 11 and a movable mold 2.
1 and a distance sensor 100, an electromagnetic switching valve (not shown) for switching pressure oil for driving the advancing / retreating device 30,
An electromagnetic switching valve (not shown) that switches the pressure oil for driving the locking device 40, an electromagnetic switching valve (not shown) that switches the pressure oil for driving the mold clamping device 50, and a pressure for driving the injection cylinder portion 70. Solenoid switching valve 73 for switching oil
a, a step motor 84 that drives the flow control valve unit 80, a distance sensor 111 provided in the ejector device 110, and a control device 200 that controls a carry-out device that carries out the molded product A, and each of them is connected to a predetermined position. It is controlled by the command of.

Next, the operation of the above structure will be described. When the molds are exchanged, the molds are mounted on the fixed die plate 12 or the movable die plate 22, and the two molds are operated by operating the mold opening / closing hydraulic cylinder 31 to approach them. Both dies are clamped by aligning guide pins (not shown). At this time, it is confirmed whether or not the dies are properly aligned, and the alignment is working. Further, the fixed mold 11 and the movable mold 21 are brought into close contact with each other, and the distance between the fixed mold 11 and the movable mold 21 is set to zero by the distance sensor 100. If the confirmation result is good, then the stamping is started. In addition, even in the case of daily startup, both dies are opened and closed by the hydraulic cylinder 31 at the time of startup inspection.
May be activated to approach and confirm. Next, the heating cylinder 71 is brought into contact with the fixed mold 11.

In order to start stamping, the moving die plate 22 which is retracted is rapidly moved toward the fixed die plate 12 by the die opening / closing hydraulic cylinder 31. When the movable die plate 22 reaches a predetermined position with respect to the fixed die plate 12, the controller 4 once sends a command to an electromagnetic control valve (not shown) of the mold opening / closing hydraulic cylinder 31 to switch the pressure oil from a pump (not shown). Then, the die opening / closing hydraulic cylinder 31 is stopped and the movement of the moving die plate 22 is stopped. Next, the control device 4 sends a command to a solenoid control valve (not shown) of the hydraulic fastening machine 41 to switch the pressure fluid from a pump (not shown) to the hydraulic fastening machine 41, and the movable die plate 22 does not move to the tie bar 51. To lock. When the locking by the locking device 40 is completed, the control device 4 sends a command to an electromagnetic control valve (not shown) of the mold clamping device 50 to switch the pressure oil from the pump (not shown) to the mold clamping cylinder 55.
The movable die plate 22 is moved toward the fixed die plate 12 by the mold clamping cylinder 55. When reaching the predetermined position, the distance sensor 100 sends a signal to the control device 4,
Once, the mold clamping cylinder 55 is stopped by a command from the control device 4. At this time, the clearance between the movable mold 21 and the fixed mold 11 (the inlay slide clearance Y is determined by the thickness and size of the molded product, approximately 30 mm to 2 mm) is wide, and the cavity 90 is large. Stop later.

When the movable die 21 stops at a predetermined position,
The control unit 4 issues a command to the step motor 84 of the flow control valve unit 80 of the injection unit 3 so that the valve 81
Swing the open plastic material from the fixed mold 11 cavity 1
Eject to 0. At this time, since the plastic material from the heating cylinder 71 is injected into the large cavity portion 10, the injection pressure can be injected at a low pressure.

Screw 72 or hydraulic cylinder 73
When a predetermined amount of the plastic material is injected into the cavity portion 10 from the distance sensor 75 mounted on the etc., a command is sent again from the control device 4 to an electromagnetic control valve (not shown) of the mold clamping device 50 to switch the command from a pump (not shown). Clamp cylinder 5 with pressure oil
5, the moving die plate 22 is moved toward the fixed die plate 12 by the mold clamping cylinder 55. This allows the moving mold 21 to move at a predetermined speed while injecting the plastic material.
Closing or opening with pressure, plastic material is used for cavity 1
Compresses and spreads in every corner of 0. As a result, the plastic material is compressed and spread in the wide cavity 10 and flows, so that the fluidity can be supplemented and the molding can be performed without impairing the physical properties of the material. Also, the pressure applied to the plastic becomes uniform,
Since the density is uniform, it is possible to perform molding with less distortion and warpage. In this way, by adding press molding while injection molding, it is possible to form a material having poor fluidity and thin-wall molding.
Also, by mixing the openings, air bubbles are mixed in the molded product,
A soft molded product is obtained.

When a predetermined amount of plastic material corresponding to the molded product A is injected, the controller 4 issues a command to the step motor 84 of the flow control valve section 80 of the injection device 3,
The valve 81 is rocked and closed to stop the injection of the plastic material. At this time, the moving mold 21 is still closed at a predetermined speed and pressure,
The plastic is compressed and spread in every corner of the cavity 10 to increase the density. When the mold contacts, the mold clamping cylinder 55 stops,
The state is maintained as it is until the plastic resin is cooled, and the plastic pressure is applied.

When the molded product A is cooled, the reverse operation to the above,
That is, the mold opening / closing hydraulic cylinder 31 is operated after the hydraulic clamping device 41 is released from the locking by the mold clamping device 50.
The movable mold 21 is retracted to the initial position. The ejector device 110 (not shown) is actuated during or after the moving mold is retracted to separate the molded product A from the mold. (Shown in FIG. 2) When the ejector device 110 finishes operating, the distance sensor 1
A command is sent from the controller 11 to the horizontal compression molding device 2
The unloading device 5 provided side by side is operated, and the molded product A is vertically or substantially vertically to the ground from the space between the fixed die plate 12 and the movable die plate 22 from above or in the lateral direction (shown in FIG. 2). Carry out A. The grip portion 5a of the carry-out device only needs to grip one end of the molded product A, and the molded product can be easily gripped, which facilitates the use of the robot.

[0025]

As described above, according to the present invention,
Since the mold mounted on the die plate is opened in advance by a predetermined amount and the cavity is made large, the plastic material is injected, so that the injection pressure can be low. In addition, since the plastic material is compressed and spread in the wide cavity and flows, it is possible to compensate for the fluidity, and it is possible to mold without impairing the physical properties of the material, the pressure applied to the plastic material is uniform, and the density is uniform. Therefore, molding with less distortion and warpage can be performed. In this way, by adding press molding while injection molding, the flow length / wall thickness ratio is about 3 compared to the conventional one.
It can be doubled to four times, and thin-walled molding becomes possible. Further, since the horizontal compression molding device is used, the overall height is lowered, and the carry-out device of the conventional injection molding machine can be used, and the robot can be easily used. Furthermore, when the press device, the injection device, and the carry-out device are arranged side by side, the space of the press device or the injection device can be used, so that the operating area of the robot is reduced and the installation area can be reduced. Furthermore, since a crane or the like can be used for exchanging the mold, an excellent effect that the number of steps can be reduced is obtained.

[Brief description of drawings]

FIG. 1 is a side view of a horizontal injection compression molding apparatus of the present invention.

FIG. 2 is a sectional view of the horizontal injection compression molding apparatus shown in FIG. 1, taken along the line WW.

FIG. 3 is an enlarged view of a mold clamping device 50.

FIG. 4 is a partially enlarged view of the locking device 40.

FIG. 5 is a schematic view showing a relationship between a mold unit and an injection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Horizontal injection compression molding device 2 Compression molding device 3 Injection device 4 Control device 5 Unloading device 10 Fixed die plate part 11 Fixed die 12 Fixed die plate 20 Moving die plate part 21 Moving die 22 Moving die plate 30 Forward / backward device 31 Gold Mold opening / closing hydraulic cylinder 40 Locking device 41 Hydraulic clamping machine 50 Mold clamping device 55 Mold clamping cylinder 70 Injection cylinder part 75 Distance sensor 80 Flow control valve part 100 Distance sensor 110 Ejector device A Molded product

Claims (3)

[Claims] 1. A fixed die plate for holding a fixed die vertically arranged on the ground and a movable die plate for holding a movable die, and an advance / retreat for rapidly moving the movable die plate with respect to the fixed die plate. Means and mold clamping means for clamping the mold while compressing and spreading the plastic by moving the movable die plate toward the fixed die plate after the movable die plate approaches the fixed die plate and reaches a predetermined position. Horizontal injection compression, which comprises a compression molding device and a moving die plate that approaches the fixed die plate and reaches a predetermined position and then opens a flow control valve to supply plastic material to the compression molding device. Molding equipment. 2. A unloading device for unloading a molded product vertically to the ground from between a fixed die plate holding a fixed die vertically arranged on the ground and a moving die plate holding the moving die. The horizontal injection compression molding apparatus according to claim 1. 3. A fixed die plate for holding a fixed die, a movable die plate for holding a movable die, an advancing / retreating means for rapidly advancing / retreating the moving die plate with respect to the fixed die plate, and the moving die plate. And a fixed die, a compression molding device including locking means for locking the movable die plate to the tie bar at a position close to the fixed die plate, mold clamping means for performing mold clamping after the movable die plate is locked to the tie bar, and a fixed mold. And an injection device for supplying a plastic material to the cavity portion of the movable mold, wherein the fixed mold and the movable mold, which are vertically arranged on the ground, are opened from the injection device when the movable mold is opened at a predetermined interval. Starting to supply the plastic material to the cavity part, and when supplying a predetermined amount, compress and spread the plastic material while operating the moving mold while moving forward and backward relative to the fixed mold. Characteristic horizontal injection compression molding equipment.