JP2008114512A - Resin molding machine with antistatic function and antistatic method for resin molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin molding machine which can prevent the deposition of dust on a finished product or a mold and at the same time, the deposition of gate tailings or runner tailings on the mold and further, dispense with air blow or fan blow procedures to the interior of the mold, and an antistatic method thereof. <P>SOLUTION: This resin molding machine 10 comprises at least, two molds 12 and 14, and an ion generating head 20 which is arranged on one side of a periphery of the contact surface of the molds so as to allow the generated ion to be directed to the interior of the opened molds. For the antistatic method, the ion generating head is arranged on one of the periphery of the contact surfaces of the molds so as to allow the generated ion to be directed to the interior of the opened molds, and after a finished product is formed by injecting the resin into the cavity, the ion is attracted to the interior of the molds from the periphery by the negative pressure inside the molds, generated during opening the molds. At the same time, the ion is introduced into the molds by applying a Coulomb repulsive force working between a discharge rod of the ion generating head and the ion originating from the discharge rod, and a Coulomb repulsive force between the ions. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

   The present invention relates to a resin molding machine having a charge eliminating function, which is used for dust countermeasures, gate scum countermeasures, runner scum countermeasures, burr countermeasures, and countermeasures for preventing product residue (product removal operation after molding). The present invention relates to a static elimination method for resin molding.

   Conventionally, there is no function to prevent foreign matter mixing failure caused by dust adhering to a mold of a molding machine, and dust is blown off by blowing the mold from the outside when necessary. However, the dust once adhered was difficult to remove and could not be completed completely.

  In addition, static electricity generated in a molded product was discharged by blowing air from the outside with a fan-type or air-blow type static eliminator when the mold was opened, and sending ions into the mold. However, in this case, temperature control is difficult because the temperature of the mold is cooled by the wind.

  When gate debris, runner debris and burrs adhered to the mold, there was no function to remove them. When necessary, the mold was air blown from the outside to remove dust. However, the dust once adhered was difficult to remove and could not be completed completely.

  In order to take measures against the rest of the product, air was sent from the outside with a fan type or air blow type static eliminator, and ions were sent into the mold to neutralize the product. However, the attached product was difficult to remove and could not be solved completely. In this case, the temperature of the mold is cooled by the wind, making temperature control difficult.

  In the conventional resin molding machine, there is a problem that dust adheres to the mold and a foreign matter mixing failure occurs. In addition, the conventional resin molding machine has a problem that dust adheres to the product and a product defect occurs. Further, the conventional resin molding machine has a problem that burrs, gate debris, and runner debris adhere to the mold, resulting in a foreign matter mixing failure. Further, the conventional resin molding machine has a problem that the product adheres to the mold and a defective product remains.

  Accordingly, the object of the present invention is to avoid dust adhering to products and molds, to avoid adhesion of gate debris and runner debris to the mold, and to eliminate air blow and fan blow into the mold. An object of the present invention is to provide a resin molding machine having a charge removal function and a charge removal method for resin molding that can improve the temperature management and reduce the number of work steps.

  In order to achieve the above-described object, the resin molding machine having a charge eliminating function of the present invention includes at least two molds that form a resin molding cavity when closed, and the molds that open the generated ions. And an ion generating head arranged on one side around the contact surface of the mold so as to face the inside of the mold.

  Further, in the static elimination method for resin molding according to the present invention, the ion generating head is disposed on one side around the contact surface of the mold so that the generated ions are directed to the inside of the opened mold, and the mold is closed. A product is formed in the cavity by injecting into the cavity formed inside the mold in a state, and ions are discharged from the surroundings by the ion generating head with the negative pressure inside the mold generated when the mold is opened after product formation In addition to being attracted to the inside of the mold, ions are introduced into the mold using the coulomb repulsive force acting between the discharge needle of the ion generating head and the ions generated therefrom and the coulomb repulsive force between ions. And

According to the present invention, the following problems that occur during resin molding can be solved.
1) Dust adhering to the product can be avoided and product defects can be reduced.
2) Dust adhering to the mold can be avoided and product defects can be reduced.
3) The adhesion of gate debris and runner debris to the mold can be avoided and product defects can be reduced.
4) Product residue in the mold can be avoided, and product defects and mold damage accidents can be reduced.
5) Air blow and fan blow into the mold can be abolished, mold temperature control can be advanced, and the manufacturing process is stabilized.
6) Air blow and fan blow into the mold can be abolished, reducing work man-hours.

  The resin molding machine having a charge eliminating function according to the present invention includes at least two molds that form a resin molding cavity when closed, and the molds so that generated ions are directed toward the inside of the opened mold. An ion generating head disposed on one side around the contact surface.

  Further, in the static elimination method for resin molding according to the present invention, an ion generating head is arranged on one side around the contact surface of the mold so that the generated ions are directed to the inside of the opened mold, and the mold is closed. A product is formed in the cavity by injecting into the cavity formed inside the mold in a state, and the ions from the ion generating head are surrounded by the negative pressure generated inside the mold when the mold is opened after the product is formed. Then, ions are introduced into the mold using the coulomb repulsive force acting between the discharge needle of the ion generating head and the ions generated therefrom and the coulomb repulsive force between the ions.

Next, embodiments of the present invention will be described with reference to the drawings.
(Example 1)
FIG. 1 is a perspective view showing a resin molding machine according to Embodiment 1 of the present invention. In FIG. 1, a resin molding machine 10 includes a fixed mold 12 (for example, a cavity is formed inside) fixed to a support base 16 and a fixed mold 12 supported by a moving rod 18. The movable side mold 14 is movable with respect to the fixed side mold 12 and has a front end surface capable of coming into contact with the front end surface of the fixed side mold 12. Around the front end portion of the fixed mold 12 that becomes high temperature, when the fixed mold 12 and the moving mold 14 are open, the fixing bracket 22 is arranged so that the generated ions are directed to the inside of the mold. A heat-resistant ion generating head (static elimination head) 20 of 200 ° C. or less is attached.

An ion generation head drive power supply 24 that supplies power to the ion generation head 20 is disposed in a room temperature environment near the resin molding machine 10, and a controller 26 that controls the ion emission timing of the ion generation head drive power supply 24 is disposed. .
(Example 2)
FIG. 2 is a view showing a resin molding machine according to Embodiment 2 of the present invention, FIG. 2a is a front view thereof, and FIG. 2b is a side view thereof. In FIG. 2, the ion generating head 20 is disposed on the contact surface of the cautery mold 12 and the core mold 14, and faces the centers of the molds 12 and 14. It is better to place four ion generating heads that are as large as possible on the four sides of the molds 12 and 14 so as to cover the entire circumference of the contact surface of the mold, but depending on the degree of static electricity generation and the size of the mold The number can be reduced or the length of the ion generating head can be shortened.

  Since the mold is referred to as setup and is always replaced, it is preferable that the ion generating head 20 is attached to one of the molds with the magnet 28 via the fixing L-shaped metal fitting 30 to facilitate attachment / detachment.

  FIG. 3 is a view for explaining the operation of the resin molding machine of Examples 1 and 2, FIG. 3a is a view showing a state before the mold is opened, and FIG. 3b is a view when the mold is opened. FIG. 3C is a diagram showing a state at the time of product ejection.

  In FIG. 3 a, the resin 32 is injected before the mold is opened, and a product 32 is formed in the cavity formed between the mold 12 and the mold 14. In this case, it is preferable not to generate ions because they are meaningless.

  In FIG. 3b, the product 32 comes out of the core mold 14 when the mold is opened. At this time, since the cavity mold 12 and the product 32 are peeled off, intense static electricity is generated. However, the ion generating head 20 releases ions 50 and covers the periphery of the contact surface between the cavity mold 12 and the core mold 14. Therefore, when the mold is opened, the surrounding air and ions 50 are sucked. The ions 50 neutralize static electricity of the product 32, dust, burrs, and gate residue. In addition, since the discharge needle 20a and air ions repel due to the repulsive force of Coulomb and fly toward the inside of the mold, the ions enter toward the inside even if the suction of air becomes weak.

  In FIG. 3c, the product 32 is peeled from the core mold 14 at the time of product ejection. At this time, since the core mold 14 and the product 32 are separated, intense static electricity is generated. However, since the discharge needle 20a and air ions repel due to the repulsive force of Coulomb and fly toward the inside of the mold, the ions 50 are Enter the interior. The ions 50 neutralize static electricity of the product 32, dust, burrs, and gate residue.

  FIG. 4 is a block diagram mainly showing an electric system. There are four ion generating heads 20, and there are four individual power sources 24a in the power source 24 for driving the heads. In addition, it can also drive with one power supply 24, without dividing | segmenting into 4 units | sets collectively. There is a controller 26 for controlling the overall power supply or ion generation. When an ion generation instruction signal (energization instruction signal to the ion generation head) is supplied from the injection molding machine to the controller 26, the power supply 24 (individual power supply 24a) is instructed to generate ions.

  FIG. 5 is a time chart of the opening / closing of the mold and the energization instruction signal. Ion generation is started immediately before the mold is opened (or at the same time as the mold is opened), and the ions are cut off after a sufficient period of time for static elimination. This prevents unnecessary ion generation. By minimizing the ion generation time, the discharge needle can be prevented from being worn out and soiled, and the frequency of cleaning and replacement of the discharge needle can be reduced. In addition, since the amount of ozone generated can be minimized, the mold can be prevented from being oxidized.

It is a perspective view which shows the resin molding machine of Example 1 of this invention. It is a figure which shows the resin molding machine of Example 2 of this invention, FIG. 2a is the front view, FIG. 2b is the side view. It is a figure for demonstrating operation | movement of the resin molding machine of Example 1 and 2, FIG. 3a is a figure which shows the state before metal mold | die opening, FIG. 3b is a figure which shows the state at the time of metal mold | die opening, FIG. 3c is a diagram showing a state at the time of product ejection. It is a block diagram which mainly shows an electric system. It is a figure which shows the time chart of opening / closing of a metal mold | die, and an electricity supply instruction | indication signal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Resin molding machine 12 Solid side metal mold | die 14 Movement side metal mold | die 16 Support stand 18 Rod 20 Ion generating head 20a Discharge needle
22 Fixing bracket 24 Ion generating head drive power supply 26 Controller 28 Magnet 30 Fixing L-shaped bracket 32 Product 34 Ejector pin 50 Ion

Claims (6)

At least two molds that, when closed, form a cavity for resin molding inside;
An ion generating head disposed on one side around the contact surface of the mold so that the generated ions are directed to the inside of the opened mold;
A resin molding machine having a charge eliminating function.   2. The resin molding machine having a charge eliminating function according to claim 1, wherein the ion generating head is a heat resistant mold of 200 ° C. or less, and is mounted on a mold or a high temperature portion near the mold to drive the ion generating head. Resin molding machine with static elimination function, characterized in that the part is a room temperature type and is placed in a room temperature part other than the mold.   The resin molding machine having a charge eliminating function according to claim 1, wherein the ion generating head is fixed to one of the molds or is detachably attached to one of the molds with a magnet. Molding machine.   2. The resin molding machine having a charge eliminating function according to claim 1, wherein the ion generating head starts radiating air ions at the same time as or immediately before the mold is opened, and radiates ions only for a time required for charge removal. Resin molding machine with static elimination function. An ion generating head is arranged on one side around the contact surface of the mold so that the generated ions are directed to the inside of the opened mold,
A product is formed in the cavity by injecting into the cavity formed inside the mold with the mold closed.
After product formation, the negative pressure generated inside the mold when the mold is opened causes the ions from the ion generating head to be sucked into the mold from the surroundings, and the discharge needle of the ion generating head and the ions generated therefrom Ions are introduced into the mold using the coulomb repulsive force and the coulomb repulsive force between ions.
A static elimination method for resin molding characterized by the above.   6. The static elimination method for resin molding according to claim 5, wherein ions float around the mold, dust floating in the mold interior when the mold is opened, and inside the mold when the mold is opened. By removing static electricity from the gate debris and runner debris that scatter from the raw resin jet gate that is cut when the mold and mold are opened, and burrs that are generated when the mold is opened and when the product is removed, the mold and product are removed. A static elimination method for resin molding, characterized by preventing dust, gate residue, runner residue, and burrs from adhering to the product, and preventing product residue (product removal operation failure) from adhering to the mold.