JP3802357B2 - Mold injection agent mist suction method and apparatus for metal injection molding machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold release agent mist suction method for a metal injection molding machine and an apparatus for injection molding a metal material such as a magnesium alloy, an aluminum alloy, and a zinc alloy after spraying a mold release agent on a dividing surface of a mold. It is.
[0002]
[Prior art]
As shown in FIG. 2, in the metal injection molding machine 1, a release agent spraying device 6 is attached to the upper part of the fixed plate 3 and attached to the movable platen 2 and the fixed platen 3 in order to improve the mold release property of the product. In a state where the mold 7 is opened, the spray nozzle 9 is lowered from the nozzle standby position 8 to spray the release agent on the divided surface of the mold 7.
[0003]
The release agent sprayed at this time once hits the dividing surface of the mold 7 and a part thereof adheres to the dividing surface. Most of the sprayed mold release agent (hereinafter referred to as mold release agent mist) spreads rapidly in all directions. However, the safety door 4 and the upper cover 5 provided around the mold 7 are used. Prevents diffusion into the atmosphere outside the aircraft.
[0004]
[Problems to be solved by the invention]
However, since the upper cover 5 is provided with an opening 10 through which the spray nozzle 9 enters and exits between the molds 7 in the machine, the release agent mist leaks from the opening 10 to the surroundings. Spread.
[0005]
In order to prevent this, as shown in FIG. 3, there is one method in which a suction duct 13 is attached to the upper cover 5, a mist separator 21 is installed at the tip, and the release agent waste liquid is discharged to the outdoors through a drain pipe 22. Adopted in the department. However, when the spray nozzle 9 reciprocates between the nozzle standby position 8 (see FIG. 2) and the nozzle lowering position 11, the speed of the release agent mist 12 that passes through the opening 10 that enters and exits and diffuses into the atmosphere is increased. Because it is fast, most of the release agent mist 12 that blows up from below does not catch up with suction, but diffuses into the atmosphere outside the machine.
[0006]
The present invention has been made to solve the above-mentioned problems, and keeps the working environment clean without diffusing the release agent mist of the release agent sprayed on the dividing surface of the mold into the atmosphere. It is an object of the present invention to provide a release agent mist suction method and apparatus capable of performing the same.
[0007]
[Means for Solving the Problems]
The present invention has solved the above problems as follows. That is, a jet blower outlet is disposed on one side of the opening for the spray nozzle to enter and exit, and a suction duct inlet is disposed on the opposite side of the opening. As a result, the exhaust from the pressure blower is discharged as a high-speed airflow layer from the jet outlet, flows horizontally above the opening, and is sucked into the suction port of the suction duct on the opposite side. As a result, the release agent mist blown up to the opening is blocked by the high-speed air flow, and is sucked into the suction port of the suction duct along the air flow.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The mold release agent mist suction method of the present invention uses the pressurized air generated by sucking the air around the heating cylinder and the injection nozzle, and the spray nozzle of the mold release agent spraying device is in the upper cover where the spray nozzle enters and leaves the machine. An airflow layer is formed above the opening, and a release agent mist rising from below is placed on the airflow and sucked.
[0010]
In the release agent mist suction device of the present invention, the spray outlet of the pressure blower is arranged on one side of the opening of the upper cover where the spray nozzle of the release agent spraying device enters and leaves the machine, and the suction duct is arranged on the opposite side of the opening. A suction port is disposed , a collection hood is provided above the heating cylinder and injection nozzle of the molding machine, and the collection hood is connected to the suction side of the pressure feed blower .
[0012]
【Example】
Embodiments of the present invention will be described with reference to the drawings.
[0013]
As shown in FIG. 1, a movable platen 2 and a fixed platen 3 are disposed on a frame of the molding machine 1 so as to face each other, and a mold 7 is attached to each of the plates 2 and 3. Further, a safety door 4 and an upper cover 5 are installed so as to surround both the boards 2 and 3.
[0014]
A release agent spraying device 6 is installed on the upper part of the fixed platen 2, and a spray nozzle 9 is attached to the tip thereof. The upper cover 5 has an opening 10 through which the spray nozzle 9 enters and exits the apparatus. The spray nozzle 9 is lowered to the nozzle lowering position 11 every time spraying is performed.
[0015]
A collection hood 20 is disposed above the heating cylinder 18 and the injection nozzle 19 of the molding machine 1 and connected to the suction side of the pressure feed blower 15. The pressure blower 15 may be on the machine or on the floor as shown in the figure. The heating cylinder 18 and the injection nozzle 19 are about 600 ° C. in the case of a metal injection molding machine for magnesium alloy, and high-temperature atmosphere air is generated around the heating cylinder 18 and the injection nozzle 19.
[0016]
On the discharge side of the pressure blower 15, a jet port 16 for creating a high-speed air flow 17 is provided in the upper part of the opening 10, and the jet direction can be freely determined by avoiding the column of the release agent spraying device 6. It is supposed to be.
[0017]
A suction port 23 of a suction duct 14 is disposed on the opposite side of the opening 10 from the jet port 16, and the other end is opened outdoors through an exhaust blower (not shown).
[0018]
A mist separator 21 is provided in the middle of the suction duct 14, and a drain pipe 22 of the mist separator 21 is connected to a collection container (not shown).
[0019]
Next, the operation of the release agent mist suction device will be described.
[0020]
After the movable platen 2 moves backward, the mold 7 is opened and the molded product is taken out, the spray nozzle 9 at the nozzle standby position 8 (see FIG. 2) descends and stops at the nozzle lowered position 11. To do.
[0021]
Next, a mold release agent is sprayed toward the divided surface of the mold 7, particularly a portion where the molten metal contacts, such as a cavity, a runner groove, and a sprue hole. Part of the release agent that hits the dividing surface adheres to the dividing surface and plays a role as a releasing agent.
[0022]
Most of the remaining spray blows up to the opening 10 above the mold 7 and tries to diffuse into the atmosphere, but in the layer of the high-speed airflow 17 flowing across the opening 10. The airflow 17 is blocked and sucked into the suction port 23 of the suction duct 14.
[0023]
The release agent mist 12 sucked into the suction port 23 of the suction duct 14 is separated into air and release agent waste liquid by the mist separator 21, the air is discharged outdoors, and the release agent waste liquid flows through the drain pipe 22. And collected.
[0024]
【The invention's effect】
As described above, according to the present invention, the release agent mist spouted upward from the opening is sucked into the suction duct along the layer of the fast flowing horizontal airflow, so that it diffuses into the atmosphere. The work environment is kept clean.
[0025]
Moreover, since the high-temperature atmosphere air generated around the heating cylinder and the injection nozzle can be discharged together, it is not necessary to provide a separate high-temperature atmosphere exhaust means, which is economical and also keeps the work environment comfortable. be able to.
[Brief description of the drawings]
FIG. 1 is a front view showing a release agent mist suction device of a metal injection molding machine according to the present invention.
FIG. 2 is a front view of a conventional metal injection molding machine.
FIG. 3 is a front view showing a conventional release agent mist suction device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Molding machine 2 Movable platen 3 Fixed platen 4 Safety door 5 Upper cover 6 Release agent spraying device 7 Mold 8 Nozzle waiting position 9 Spray nozzle 10 Opening part 11 Nozzle lowering position 12 Release agent mists 13 and 14 Suction duct 15 Pressure feed Blower 16 Jet outlet 17 High-speed air flow 18 Heating cylinder 19 Injection nozzle 20 Collection hood 21 Mist separator 22 Drain pipe 23 Suction port

Claims (3)

In a mold release agent mist suction method for a metal injection molding machine provided with a release agent spraying device (6) for spraying a release agent on a dividing surface of a mold,
An upper cover through which the spray nozzle (9) of the release agent spray device (6) enters and leaves the machine using the pressure-feed air generated by sucking the air around the heating cylinder (18) and the injection nozzle (19) (5) above the opening (10) of creating a layer of air flow (17), a metal, wherein the release agent mist coming up from below (12) for sucking put on the air flow (17) Method of sucking mold release agent mist for injection molding machines. In a mold release agent mist suction device of a metal injection molding machine provided with a mold release agent spraying device (6) for spraying a mold release agent on a mold dividing surface,
The jet nozzle (16) of the pressure blower (15) is arranged on one side of the opening (10) of the upper cover (5) through which the spray nozzle (9) of the release agent spraying device (6) enters and leaves the machine, and the opening The suction port (23) of the suction duct (14) is arranged on the opposite side of (10), and a collection hood (20) is provided above the heating cylinder (18) and injection nozzle (19) of the molding machine. A release agent mist suction device for a metal injection molding machine, wherein a collection hood (20) is connected to a suction side of the pressure feed blower (15).   The release agent mist suction device for a metal injection molding machine according to claim 2, wherein a mist separator (21) is provided in the suction duct (14).

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