JP3019436B2 - Control device of secondary injection device in composite molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a secondary injection device used for composite molding such as multi-material, multi-color molding, and more particularly to a control device for a primary injection device for performing primary molding. The present invention relates to a control device for a secondary injection device for performing injection of a liquid.

[0002]

2. Description of the Related Art Composite molding such as multi-material, multi-color molding generally uses individual primary molding dies and secondary molding dies, and a resin (resin material) is used for each of the molding dies. This is performed by a dedicated machine having a plurality of screw-type resin injection devices that individually perform injection filling.

[0003]

In a special-purpose machine for performing composite molding such as multi-material, multi-color molding, a plurality of screw-type resin injection devices are each capable of injecting a thermoplastic resin. It is of a driven type, and as a result, a dedicated compound molding machine is often large and expensive compared to a normal injection molding machine. This is multi-material,
This may increase the production cost of a composite molded article such as multicolor molding.

In particular, in the secondary molding process, a relatively small amount of rubber material for elastic sealing is used instead of a sealing member such as a gasket or an O-ring mainly for molded articles such as a hermetic case and cover made of a thermoplastic resin. In the case of injection molding, for example, injection of rubber materials does not require a full-scale screw-type resin injection device capable of injecting thermoplastic resin, and this is a simple screw-type resin with low injection pressure etc. It is performed by a large-scale composite molding machine equipped with a plurality of full-scale screw-type resin injection devices capable of injecting a thermoplastic resin, despite being sufficiently performed by an injection device.

[0005] Here, an injection device for secondary molding used by being attached to an existing injection molding machine in an attachment type is conceivable, but the existing injection molding machine and the injection device for secondary molding are individually provided. Considering the design, matching between the two becomes a problem.

SUMMARY OF THE INVENTION The present invention provides a control device for controlling an injection device for secondary molding which is used by being attached to an ordinary existing injection molding machine in an attachment manner in a flexible manner in relation to a primary injection device. It is intended to provide.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a primary injection device for performing primary molding,
In the control device of the secondary injection device that performs injection for secondary molding, a primary molding completion signal is given from the primary injection device, and the signal is input as a timer activation signal to activate the first timer, After the timer set time by the first timer has elapsed, a start command is output to the secondary injection device, an injection completion signal is given from the secondary injection device, the signal is input as a timer start signal, and a second timer Control means for outputting a mold opening command to the primary injection device after a lapse of a timer set time by the second timer, and a first timer setter for variably setting a timer set value by the first timer. And a second timer setting device for variably setting a timer set value by the second timer.

[0008]

According to the above construction, the first timer setting device and the second timer setting device set the injection operation timing for secondary forming by the secondary injection device after the completion of the primary molding,
The mold opening timing after the completion of the secondary injection is variably set by a user to an appropriate value in accordance with the resin curing time required for each of the primary molding and the secondary molding.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an example of a conventional horizontal injection molding machine to which a secondary injection device to which the control device according to the present invention is applied is assembled.

The horizontal injection molding machine is guided on a base 1 by a primary injection device 3 composed of an ordinary hydraulically driven screw type resin injection device for thermoplastic resin injection, a fixed platen 5 and a tie bar 7. Movable plate 9 which can be moved in the horizontal direction
And the mold clamping device 1 for driving the movable platen 9 in the left-right direction in the figure.
And 1.

A primary and secondary common mold 13 is fixed to the movable platen 9, and the fixed platen 5 can be exchanged between the primary mold 19 and the secondary mold 21 by the slide-type mold exchange head 15 and the mounting plate 17. Attached to.

As shown in FIG. 2, the primary mold 19 is configured to mold the main body M of the composite molded article, and is brought to a position where it is engaged with the primary and secondary common mold 13 during the primary molding. On the other hand, the secondary mold 21 is configured to mold the band-shaped elastic seal portion S of the composite molded article, and engages with the primary / secondary common mold 13 as shown in the figure during the secondary molding. Is brought to a position where

The primary molding for molding the main body M of the composite molded article is performed by PP, PBT, PC, AB from the primary injection device 3.
This is performed by injecting a thermoplastic resin such as S, PA-6, PA-66, or a thermosetting resin such as epoxy or phenol.

On the other hand, the secondary molding for molding the elastic seal portion S of the composite molded product is performed on the resin injection hole 23 formed in the partition between the secondary mold 21 and the primary and secondary common mold 13. The injection is performed by injection of rubber or elastic resin such as liquid silicone, urethane, soft vinyl chloride, and olefin. This injection is mounted on the base 1 by the XY table 25 so as to be adjustable in position and is performed by the screw type secondary injection device 27. It has become.

As shown in FIGS. 3 and 4, the secondary injection device 27 has a cylinder fixing base 31 fixed on a back-and-forth forward board 29, and the cylinder fixing base 31 is an injection cylinder member. 33 is fixedly held in a horizontal posture.

The injection cylinder member 33 forms an injection cylinder chamber 35 therein, and has a tapered cylinder head member 37 for holding an injection nozzle connected to one end thereof on the same axis.

In the injection cylinder chamber 35 of the injection cylinder member 33, an injection screw 39 is disposed so as to be rotatable around its own central axis and movable in the axial direction. The injection screw 39 has a relatively large pitch, and has a large lead angle.
And a square screw-shaped mixing screw portion 43 provided in front of the screw pump action portion 41 at a smaller pitch than the screw pump action portion 41 and having a smaller lead angle. In the mixing screw portion 43, a plurality of axial grooves 45 having a rectangular cross section having a depth equal to the screw height are provided at equal intervals in the circumferential direction over the entire area in the axial direction.

A seal ring member 47 is attached to the tip of the injection screw 39, and a valved nozzle device 49 is attached to the tip of the cylinder head member 37.

A plunger shaft 51 is coaxially fixedly connected to the rear end of the injection screw 39. The plunger shaft 51 protrudes rearward from the rear end of the injection cylinder member 33, and this protruding portion is moved by a linear motion bearing 55 held by a bearing support member 53 fixed to the cylinder fixing base 31. It is supported so as to be rotatable around and movable in the axial direction.

A flange 57 is provided near the rear end of the plunger shaft 51, and the plunger shaft 51 in this portion is provided.
As shown in FIG.
One end of 9 is axially connected so as to be relatively rotatable with a needle thrust bearing 63 interposed between an end ring 61 fixedly mounted on the plunger shaft 51 and a flange 57.

As shown in FIG. 4, the drive arm 59 extends in the radial direction of the injection cylinder member 33, and has a cylinder rod 67 of the pneumatic cylinder device 65 at the distal end.
Is connected to the tip of the Pneumatic cylinder device 65
Are arranged in parallel with the side of the injection cylinder member 33 and are fixed to the side wall of the cylinder fixing base 31.

At the rear end of the plunger shaft 51, there is formed a shaft receiving hole 69 which extends in the axial direction at the center of the plunger shaft 51 and is opened at the rear end surface of the plunger shaft 51. The rotary drive shaft 73 can be inserted into and removed from the shaft receiving hole 69 by a torque transmission type linear motion bearing 71, in other words, the telescopic coping with the plunger shaft 51 is fitted in a torque transmitting relationship.

The rotation drive shaft 73 is connected to an output shaft 77 of a motor 75 fixed on the forward / backward moving board 29 in a torque transmitting relationship by a coupling 79.

A resin supply block 81 is fixed to the cylinder fixing base 31. The resin supply block 81 is provided with a resin material supply tube 83 also serving as a measuring cylinder. The resin material supply tube 83 communicates with a resin passage 87 provided in the resin supply block 81 with a resin discharge port 85 at the tip. The resin passage 87 is
The resin passage 91 of the resin supply block 81, the resin passage 93 of the cylinder fixing base 31, and the injection cylinder member 3 via a rotary valve 89 provided in the resin supply block 81.
3 is selectively communicated with a resin supply port 95 provided at an intermediate portion.

The rotary valve 89 is of a manual type which is rotated by a manual lever 97. When the rotary valve 89 is in a rotating position as shown in FIG.
1 and is rotated 90 degrees clockwise from the rotational position as shown in FIG. 1 to the cleaning solvent passage 99 formed in the resin supply block 81 and the resin passage 87. 1 and the resin passage 91, and when rotated 180 degrees clockwise from the rotational position as shown in FIG. 1, the communication between the resin passage 85 and the resin passage 91 is cut off to wash. Solvent passage 99 for communication with the resin passage 91,
Is connected to the resin passage 85. The cleaning solvent passage 99 communicates with a cleaning solvent supply port 101 provided in the resin supply block 81, and is supplied with a cleaning solvent from a cleaning solvent tank (not shown).

The resin material supply tube 83 has a piston 1
03 is fitted, and the resin material in the resin material supply tube 83 is discharged from the resin discharge port 85 to the resin passage 87 by moving the piston 103 to the left in the figure.

In the resin supply block 81, a resin material supply tube pneumatic cylinder device 105 is provided.
It is attached in parallel with. In the pneumatic cylinder device 105 for feeding resin material, a connecting plate 109 is attached to the tip of a piston rod 107, and one end of a push rod 111 is fixedly connected to the connecting plate 109.
A push pad 113 is attached to each end of the push rod 111, and the push pad 113 abuts against the piston 103 of the resin material supply tube 83 and presses it to the left in the figure. .

A U-shaped position detecting rod 115 is attached to the push pad 113, and a switch support rod 117 is attached to the resin supply block 81 in parallel with the resin material supply tube 783. Proximity switches 119 and 121 that perform switching by proximity of a switch sensitive member 123 attached to the tip of the position detection rod 115 are attached to the switch support rod 117 so that the attachment position can be adjusted. Thereby, the push pad 113 and the resin material supply tube 8 are formed.
The axial position of the third piston 103 is monitored.

The forward / backward moving substrate 1 is connected to a moving table 127 of a rodless pneumatic cylinder device 125 fixed to a Y-axis table 129 of an XY table 25, and is moved back and forth in the left-right direction in FIG. It has become so.

The XY table 25 has a base member 131 fixed to the base 1 and a base member
1 and an X-axis table 133 movable in the X-axis direction (a direction perpendicular to the plane of FIG. 3).
A Y-axis table 129 is provided which is movable on the axis table 133 in the Y-axis direction (the horizontal direction in FIG. 3). The X-axis table 133 is fixed to the base member 131 at an arbitrary position in the X-axis direction by a lock screw 135, and the Y-axis table 129 is fixed to the X-axis table 133 at an arbitrary position in the Y-axis direction by a lock screw 137. It has become.

As a result, the nozzle position of the secondary injection device 27 is slightly shifted to the position corresponding to the resin injection hole 23 (see FIG. 1) formed in the partition between the secondary mold 21 and the primary and secondary common mold 13. Adjusted.

FIG. 5 shows a control system of the injection molding machine. This control system includes a CPU 141, a ROM 143 storing a system program and the like, a RAM 145 serving as a data memory and a working memory, a timer 147 for measuring time, and an I / O for performing signal input / output with the primary injection device 3. A port 147, an I / O port 149 for inputting and outputting signals to and from the secondary injection device 27, and an I / O port 151 for inputting and outputting signals to and from various setting units described later. When a primary molding completion signal is given to the I / O port 147 from the primary injection device 3, the CPU 141 inputs the signal as a timer activation signal, activates the timer 145 as a first timer by software processing, and After a timer set time by one timer has elapsed, a start command is output from the I / O port 149 to the secondary injection device 27, and an injection completion signal is given from the secondary injection device 27 to the I / O port 149, whereby the signal is output. Is input as a timer start signal, and timer 1 is executed by software processing.
45 is started as a second timer, and a mold opening command is output from the I / O port 147 to the primary injection device 3 after the elapse of the timer set time by the second timer.

An I / O port 151 has an injection timer setting device 153 as a first timer setting device for variably setting a timer set value by the first timer, and a variable timer setting value by the second timer. A curing timer setting device 155 as a second timer setting device to be set; an injection amount setting device 157 for variably setting the resin injection amount by the secondary injection device 27; and an injection screw of the secondary injection device 27 by the electric motor 75. A screw rotation speed setting device 159 for variably setting the rotation speed of the nozzle 39, a nozzle forward / backward speed setting device 161 for variably setting the forward / backward speed of the injection cylinder member 33 by the rodless pneumatic cylinder device 125, and injection by the pneumatic cylinder device 65 A screw forward speed setting device 161 that variably sets the forward speed of the screw 39 is connected. These setting devices may be constituted by individual volume switches, digital switches, keyboards, or the like, and are operated by the user to variably set each set value within an allowable range.

Thus, each set value can be variably set by the user within an allowable range.

In order to form the elastic seal portion S of the composite molded product, an elastic resin is injected into the resin injection hole 23 of the partition between the secondary mold 21 and the primary and secondary common mold 13 by the secondary injection device 27. Injecting is performed after the primary molding completion signal is given to the I / O port 147 from the primary injection device 3.
After the elapse of the timer set time set by the injection timer setting device 153, the secondary injection device 27 is output from the I / O port 149.
Is started when a start command is output to The timer set value set by the injection timer setting unit 153 may be determined according to the curing time of the resin for the primary molding, the pressure holding time, the mold replacement time, and the like.

When a start command is output to the secondary injection device 27, first, the pneumatic cylinder device 105 for feeding resin material is driven in a state where the rotary valve 89 is in the rotating position as shown in FIG. The piston 103 of the resin material supply tube 83 is pressed to the left in the figure by the push rod 111 and the push pad 113, whereby the resin material of the resin material supply tube 83 is dispensed with the resin passage 87, the rotary valve 89, and the resin passages 91 and 93. Through the resin supply port 95 and into the injection cylinder chamber 35 of the injection cylinder member 33. In addition, the rotation of the rotary drive shaft 7 is
3 is driven to rotate, and the rotation thereof is transmitted to the plunger shaft 51 and the injection screw 39 by a torque transmission type linear motion bearing 71. As a result, they rotate around their own central axis, and the resin material fed into the injection cylinder chamber 35 moves forward in the injection cylinder chamber 35 by the screw pump action of the screw pump action section 41 of the injection screw 39. That is, it is pressure-fed to the mixing screw part 43.

Since the mixing screw portion 43 is provided with the axial groove 45 in the entire axial direction, the resin material from the resin material supply tube 83 which is pressure-fed to the mixing screw portion 43 is subjected to a compressive action. A part of the resin material flows along the screw groove of the mixing screw part 43, and the remaining resin material travels along each axial groove 45 to generate a plurality of flows, which are repeatedly merged and separated. Thereby, the kneading of the resin material from each resin material supply tube 83 is performed with high efficiency and uniformity.

The kneaded resin material reaches the tip of the injection screw 39, pushes and opens the seal ring member 47, and flows toward the nozzle of the cylinder chamber 35.

In response to the injection of the resin material into the nozzle side of the injection cylinder chamber 35, the reaction force acts on the injection screw 39 as a rightward force in the drawing, whereby the injection screw 39 and the plunger The shaft 51 is retracted to the right in the figure.

When a predetermined amount of the resin material is filled in the injection cylinder chamber 35, the rotation of the injection screw 39 by the electric motor 75 and the discharge of the resin material from the resin material supply tube 83 by the pneumatic cylinder device 105 are stopped. Next, the forward / backward moving substrate 29 is moved forward by the rodless pneumatic cylinder device 125. Thereby, the cylinder fixing base 31, the injection cylinder member 33, the injection screw 39
Moves forward, the tip of the nozzle 49 contacts the side wall of the molding die, and the nozzle 49 communicates with the resin injection hole 23 in the partition between the secondary die 21 and the primary and secondary common die 13. Become like

Next, the injection screw 39 is driven forward by the pneumatic cylinder device 65. Then, the injection screw 39 acts as a piston, and the forward thrust of the injection screw 39 by the pneumatic cylinder device 65 is converted into the injection pressure into the resin material in the injection cylinder chamber 35, and the resin material in the injection cylinder chamber 35 is converted. Is injected from the nozzle 49 into the resin injection hole 23.

When a predetermined amount of resin is injected into the resin injection hole 23 and this injection is completed, an injection completion signal is given to the I / O port 149 from the secondary injection device 27. CPU1
Reference numeral 41 outputs a mold opening command from the I / O port 147 to the primary injection device 3 after the timer set time set by the curing timer set value 155 elapses after the injection completion signal is input. As a result, the primary injection device 3 opens the mold, and the molded product is taken out. Curing timer setting device 15
The timer set value set by 5 may be determined according to the curing time of the resin for secondary molding, and the like.

Although the present invention has been described in detail with reference to specific embodiments, the present invention is not limited to these embodiments, and various embodiments can be made within the scope of the present invention. Some will be apparent to those skilled in the art.

[0045]

As can be understood from the above description, the control device of the secondary injection device in the composite molding according to the present invention is a primary molding device which is controlled by a timer setting device such as an injection timer setting device and a curing time timer setting device. The injection operation timing for the secondary formation by the secondary injection device after completion, the mold opening timing after the completion of the secondary injection, are appropriate values according to the time required for the resin curing of the primary molding and the secondary molding by the user. , So that the control of the injection device for secondary molding, which is used by being attached to an ordinary existing injection molding machine in an attachment manner, is performed in a flexible manner in relation to the primary injection device. Become.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a horizontal injection molding machine to which a control device of a secondary injection device in composite molding according to the present invention is applied.

FIG. 2 is a sectional view showing an example of a molding die used for composite molding.

FIG. 3 is a side view showing an embodiment of a secondary injection device attached to a horizontal injection molding machine to which a control device of the secondary injection device in composite molding according to the present invention is applied.

FIG. 4 is a plan view of an injection cylinder portion of the secondary injection device shown in FIG.

FIG. 5 is a block diagram showing an embodiment of a control device of the secondary injection device in the composite molding according to the present invention.

[Explanation of symbols]

 141 CPU 153 Injection timer setting device 155 Curing timer setting device

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-62-51410 (JP, A) JP-A-61-268434 (JP, A) JP-A-61-259944 (JP, A) JP-A-61-259944 259943 (JP, A) JP-A-3-230929 (JP, A) JP-A-57-77546 (JP, A) JP-A-57-77545 (JP, A) JP-A-62-199254 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 45/00-45/17 B29C 45/76

Claims (1)

(57) [Claims] 1. A primary injection device, which is attached to a primary injection device for performing primary molding and performs injection for secondary molding, receives a primary molding completion signal from the primary injection device. Is input as a timer start signal to start the first timer, outputs a start command to the secondary injection device after the timer set time by the first timer has elapsed, and gives an injection completion signal from the secondary injection device. Control means for inputting the signal as a timer start signal, starting a second timer, and outputting a mold opening command to the primary injection device after a timer set time by the second timer has elapsed; and A composite comprising: a first timer setting device for variably setting a timer set value by a timer; and a second timer setting device for variably setting a timer set value by the second timer. Control device for secondary injection device in molding.