JP2551098B2 - Injection mold equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement of an injection molding die device that performs gate cutting with a spear.

[Prior Art] FIG. 2 is a side sectional view showing an injection molding die apparatus of this type. The injection mold apparatus shown in this figure includes a fixed mold 3 mounted on a fixed mounting plate 1 via a fixed receiving plate 2 and a movable mold plate 4 movably provided so as to face the fixed mold plate 3. And a spear 6 fitted to the fixed receiving plate 2 via a runner push 5, and a gate 8 opening to the cavity 7 is provided between the spear 6 and the runner push 5 and in the fixed mold plate 3. The molten resin passage 9 is provided.

Here, the spear 6 is the spear body 10 and this spear body.
It is composed of a spear chip 11 provided at the tip of 10 and is heated by a heating wire built in the spear body 10 and the spear chip 11, whereby the molten resin passage 9
It is designed to heat the resin inside.

Such an injection molding die device performs injection filling and holding pressure of molten resin in a state where the entire spear 6 is heated,
A few seconds before opening 3, 4, the energization to the spear chip 11 is stopped and the resin in the vicinity of the gate 8 is cooled and solidified, whereby the resin in the cavity 7 and the resin in the molten resin passage 9 are separated when the mold is opened. It is designed to divide. Then, in the next injection molding, the spear chip 11 is again energized to melt the cooled and solidified resin.

By the way, in an injection molding die device that automatically and continuously performs a series of steps from resin injection filling to product removal, a signal for starting energization to the spear chip 11 is sent before mold clamping, that is, mold opening. The signal is emitted when or a few seconds later. This is because it takes some time from the start of energization until the spear tip 11 reaches a predetermined temperature and melts the surrounding resin.
This is because it is necessary to heat the spear chip 11 in advance while taking out the product.

Therefore, in order to start the injection molding work with the injection molding die device, in preparation for starting the automatic operation, the operations of energizing the spear chip 11, mold clamping injection molding, and stopping the energization of the spear chip are performed manually. In addition, by turning on a predetermined start button, automatic operation after mold opening is started.

[Problems to be Solved by the Invention] However, since the spear tip 11 is not sufficiently heated at the start of the injection molding operation, injection may be performed in a state where the resin near the gate 8 is solidified. There was a problem that the gate 8 and the spear 6 were damaged.

In addition, various conditions such as the temperature of the mold plate 3 are different at the time of starting the work and at the time of continuous operation. Therefore, in the above-mentioned injection molding die apparatus, it is discarded and discarded before the stable full-automatic operation is performed. There is also a problem that the manufacturing cost of the plastic product becomes expensive because a large number of such products must be molded.

[Object of the Invention] The present invention has been made in order to solve the above problems, and can prevent the occurrence of accidents such as gate damage and smooth the transition from the start of work to full-automatic operation. Therefore, it is an object of the present invention to provide an injection molding die device which can be performed in a small amount and therefore can reduce the amount of waste products.

[Means for Solving the Problems] The injection molding die apparatus of the present invention performs a series of operations from energization of the heating wire built in the spear chip, injection molding, stop of energization of the spear chip, and mold opening. A fully automatic sequence circuit that is automatically and continuously performed, and a start-up sequence circuit that starts the energization of the spear chip by operating the hand switch and performs the process consisting of the series of operations described above for the set number of processes. A first switch which is provided with a changeover switch for selecting either a fully automatic sequence circuit or a startup sequence circuit, and which issues a signal to the startup sequence circuit to start injection molding after a lapse of a set time from the start of energization of the spear chip. A timer and a second timer that issues a signal to stop energizing the spear chip after a lapse of a set time from the start of injection molding are configured.

[Operation] In the injection molding die apparatus having the above-described configuration, by selecting the startup sequence circuit, the injection molding work can be started by energizing the spear chip by operating the hand switch. By properly selecting the set time of the timer, the resin in the vicinity of the gate can be reliably melted, and an accident such as damage to the gate can be prevented. Further, since a series of injection molding steps by the startup sequence circuit can be performed a set number of times, it is possible to easily perform an injection molding trial before starting the fully automatic operation, that is, a startup operation. Then, in this start-up operation, the settings of the first and second timers are gradually approached to the settings for full-automatic operation by the fully-automatic sequence circuit, so that it is possible to smoothly shift to full-automatic operation, and to dispose. You can reduce the number of items.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a flow chart showing the operation of the startup sequence circuit of the injection molding die apparatus of the embodiment.
The start-up sequence circuit is for performing a start-up operation, and is a timer 1 (first timer) that is activated by a start-up signal 1 issued by turning on a mold push button.
And a timer 3 (second timer) that operates when the set time of the timer 1 has elapsed. Also,
This injection molding die apparatus also has a timer 3 (first timer) that operates when the start-up signal 1 is turned on, and a timer 4 (second timer) that operates when the set time of the timer 1 has elapsed. .

First, when the startup operation is performed, automatic startup is selected by the changeover switch. Then, the start-up signal 1 is turned on by turning on the embossing button. When the start-up signal 1 is turned on, the timer 1 is activated, and at the same time, energization of the spear chip is started. At the same time,
The buzzer and patrol lights that indicate startup operation are also turned on. The timer 1 activates the timer 2 when the set time has elapsed, and simultaneously starts mold clamping injection molding. Then, when the injection molding and pressure-holding steps are completed, the timer 2 turns off the start-up signal 1 after the set time has elapsed, and stops energizing the spear chip.
As a result, the resin in the vicinity of the gate is cooled and solidified, and the gate is cut during the next mold opening.

On the other hand, the timers 3 and 4 are used when two-color molding is performed, and have the same role as the timers 1 and 2. In other words, the two-color molding die has two or more spears in order to perform the secondary molding in which the carp mold is retracted after the primary molding and the space occupied by the core mold is injected and filled with the resin of different colors. There is. The injection molding die device turns on the start-up signal 2 for secondary molding later than the start-up signal 1 to start and stop energization of the spear chip in the secondary molding as in the case of temporary molding. To control. That is, when the start-up signal 1 is turned on, the timer 3 is activated, and when the set time has elapsed, the start-up signal 2 is turned on. As a result, power supply to the spear tip for secondary molding is started. Then, the timer 4 is activated when the set time of the timer 1 has elapsed, and the startup signal 2 is turned off when the set time has elapsed. As a result, the power supply to the spear tip for secondary molding is stopped, and the gate is cut by the next mold opening.

Such a series of operations is continuously performed the number of times set in the startup sequence circuit. The start-up signal 1 in this continuous operation is turned on after the mold opening signal or a set time has elapsed after the mold opening. On the other hand, when the start-up operation is completed and the full-automatic operation is started, the fully automatic operation is selected by the changeover switch and the mold push button is turned on. Thereby, the injection molding returning to the fully automatic sequence circuit is continuously performed.

In the injection molding die apparatus as described above, by selecting the start-up sequence circuit, the injection molding work can be started by energizing the spear chip by operating the hand switch. The resin in the vicinity of the gate can be surely melted by appropriately selecting, and it is possible to prevent accidents such as breakage of the gate at the start of work. Further, since a series of injection molding steps by the startup sequence circuit can be performed a set number of times, the startup operation can be easily performed. In this startup operation, by gradually setting the timer-1 and 2 settings to the settings for fully automatic operation by the fully automatic sequence circuit, it is possible to smoothly shift to fully automatic operation, and Can be reduced, and the manufacturing cost of plastic products can be reduced.

[Effects of the Invention] As described above, the injection molding die apparatus of the present invention is provided with the startup sequence circuit for performing the injection molding of the set number of steps starting from the energization of the spear chip, and the injection molding is started. Since it has a first timer for starting and a second timer for stopping energization to the spear chip, it is possible to easily perform the startup operation before entering the fully automatic operation by selecting the startup sequence circuit. You can In this startup operation, the settings of the first and second timers are gradually brought closer to the settings of the fully automatic operation by the fully automatic sequence circuit, so that the automatic operation can be smoothly performed without damaging the gate or the like. Therefore, the number of products to be disposed of can be reduced, and the manufacturing cost of plastic products can be reduced.

[Brief description of drawings]

FIG. 1 is for explaining one embodiment of the present invention, and is a flow chart showing the operation of the injection molding die apparatus by the startup sequence circuit, and FIG. 2 is a side sectional view showing the injection molding die apparatus. . 1 ... Spear chip.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroo Usui 3-1 Koganecho, Niigata City, Niigata Prefecture Mitsubishi Metals Co., Ltd. Niigata Works (56) References JP 63-114612 (JP, A) JP 64 -71723 (JP, A)

Claims (1)

(57) [Claims] 1. A fully automatic sequence circuit for automatically and continuously performing a series of operations including energization of a heating wire incorporated in a spear chip, injection molding, stopping energization of a spear chip, and mold opening. Starting from energization to the spear chip by operating the hand switch, a startup sequence circuit for performing the steps consisting of the series of operations for a set number of steps,
The start-up sequence circuit is provided with a changeover switch for selecting one of the fully automatic sequence circuit and the start-up sequence circuit, and the start-up sequence circuit starts injection molding after a set time has elapsed from the start of energization of the spear chip. An injection molding die apparatus, comprising: a first timer that emits a signal; and a second timer that emits a signal to stop energizing the spear chip after a lapse of a set time from the start of injection molding.