JP3597179B2 - Release agent spray device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a release agent spraying device for spraying an aqueous solution of a release agent onto the surface of a mold in metal injection molding.
[0002]
[Prior art]
Generally, a metal injection molding machine has a configuration in which a molten metal material is injected into a cavity in a mold, and after the metal material has cooled, the mold is opened to take out a solidified molded product. Then, after the molded product is taken out, an aqueous solution of a release agent is applied to the inner wall of the cavity every time so that the next molded product is easily separated from the mold.
[0003]
FIG. 3 is an overall configuration diagram of a conventional release agent spraying device, and FIG. 4 is a diagram of the release agent spraying device shown in FIG.
[0004]
The conventional release agent spraying device 113 has a nozzle portion 106 to which an aqueous solution of the release agent is sprayed, and an air cylinder 104 that moves the nozzle portion 106 up and down, and is mounted on a fixed plate of a metal injection molding machine (not shown). , Base 110. The nozzle 106 is connected to the diluting device 101 for diluting the release agent with water supplied from the water supply pipe 112 via the release agent piping 102, and also connected to the air piping 103 for supplying air. The release agent aqueous solution and the air supplied to the nozzle unit 106 are supplied to the plurality of nozzles 111 and 111 ′ by the branch block 105. The nozzles 111 and 111 ′ are each formed of a pipe whose tip is bent so as to face a required portion of a mold (not shown). In addition, only the air is supplied to the nozzle 111 ′ for air blow, and the air and the aqueous solution of the release agent are supplied to the nozzle 111 for spraying the release agent.
[0005]
Next, the operation of the conventional release agent spraying device 113 will be described.
[0006]
In metal injection molding, a mold (not shown) including a fixed mold and a movable mold is closed, molten metal is injected, and the mold is opened after the measurement and cooling steps are completed. After taking out the molded product, the nozzle portion 106 of the release agent spraying device 113 is lowered by the air cylinder 104 between the fixed mold and the movable mold, and firstly, to remove burrs and the like. Perform 1 air blow. Next, a mold release agent aqueous solution diluted to an arbitrary magnification by the diluting device 101 is mixed with air and sprayed on a mold. Finally, a second air blow is performed to dry the mold release agent. One cycle ends.
[0007]
[Problems to be solved by the invention]
However, in the conventional release agent spraying device, the aqueous solution of the release agent supplied through the release agent pipe from the dilution device installed at a position distant from the release agent spray device is mixed into the air and the metal is sprayed as it is. Since the mold is sprayed, the amount of the release agent aqueous solution or the temperature may become unstable due to the length of the release agent piping. In addition, since the temperature of the aqueous solution of the release agent itself is room temperature, when the aqueous solution of the release agent at room temperature is sprayed on the mold heated to 150 to 200 ° C., the temperature of the surface of the mold is lowered, and the molded product is cooled. In some cases, it had an adverse effect.
[0008]
Therefore, an object of the present invention is to provide a release agent spraying device that can reduce the adverse effect of a release agent aqueous solution on a molded article.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a release agent spraying device of the present invention is directed to a release agent spraying device for spraying a release agent aqueous solution onto a surface of a mold to improve the releasability of a molded article from the mold. A heating tank having a heater for heating the aqueous solution of the release agent, which is supplied from the outside through the release agent pipe and is ejected from the plurality of nozzles, is connected to the release agent pipe and each of the nozzles; It is arranged between the branch block that distributes the aqueous solution to each nozzle (and the supply part of the heating tank is directly attached to the inflow part of the branch block to which each nozzle is connected .
[0010]
The release agent spraying apparatus of the present invention configured as described above is provided with a heating tank for heating the aqueous release agent solution between the release agent pipe and the branch block to which the nozzle is connected. ing. For this reason, since the temperature of the release agent aqueous solution sprayed on the high-temperature mold can be kept high, the temperature of the mold is lowered so as to affect the molded product by the spray of the release agent aqueous solution. Nothing. In addition, the release agent aqueous solution can be heated immediately before being sprayed from the nozzle. That is, when controlling the heating temperature of the aqueous solution of the release agent, it is not necessary to consider heat radiation from the piping system, so that it is easy to heat the aqueous solution of the release agent to a constant temperature. Thereby, the fluidity of the release agent aqueous solution is stabilized, and a constant amount of the release agent aqueous solution can always be applied to the mold surface.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. Note that the present embodiment is not limited to numerical values and the like used in the following description.
[0013]
FIG. 1 is a front view of a release agent spray device according to an embodiment of the present invention, and FIG. 2 is a side sectional view of a heating tank of the release agent spray device shown in FIG.
[0014]
The release agent spraying device 13 includes a heating tank 6 for heating the aqueous release agent solution, and has a nozzle unit 1 for spraying the heated aqueous release agent solution, and an air cylinder 4 for moving the nozzle unit 1 up and down. Are fixed on a fixed plate of a metal injection molding machine (not shown).
[0015]
The nozzle unit 1 further has an air pipe 3 and a release agent pipe 2 connected to the inflow side via a heating tank 6, and a plurality of nozzles 11 and 11 ′ for ejecting the release agent aqueous solution and air flow out. It has a branch block 5 connected to the side.
[0016]
The release agent pipe 2 is connected to a diluting device (not shown), and supplies an aqueous solution of the release agent diluted to an arbitrary magnification to the heating tank 6, and the air pipe 3 is provided with an unillustrated compressor such as a compressor. It is connected to compressed air supply means and supplies compressed air to the nozzles 11, 11 '.
[0017]
The nozzles 11 and 11 ′ are formed of a plurality of pipes whose ends are bent so as to face necessary portions of a mold (not shown), and the release agent aqueous solution supplied from the heating tank 6 and the air pipe 3 from the air pipe 3. The compressed air is distributed to the nozzle 11 ′ that performs air blow only by the compressed air in the branch block 5 and the nozzle 11 that sprays the release agent aqueous solution by sucking the release agent aqueous solution into the compressed air stream. You.
[0018]
The heating tank 6 has therein a heater 7 for heating the aqueous solution of the release agent, a thermocouple 14 for measuring the temperature of the aqueous solution of the release agent, and a release agent stored in the tank 6 for heating. An adjusting plate 8 for adjusting the amount of the aqueous solution. In the heating tank 6, a supply part for discharging the heated release agent aqueous solution is directly attached to the inflow part of the branch block 5. Further, the heating tank 6 can reduce the capacity of the heating tank 6 by tightening the bolts 9 and lowering the adjustment plate 8, and the heating tank 6 by loosening the bolts 9 and raising the adjustment plate 8. It is configured to increase the internal capacity. That is, the heating tank 6 reduces the capacity in the heating tank 6 when the temperature of the release agent aqueous solution is set to a high temperature, and decreases when the temperature of the release agent aqueous solution is set to a relatively low temperature. The temperature in the heating tank 6 can be increased by increasing the capacity. In the case of the heating tank 6 of the present embodiment, the temperature of the aqueous solution of the release agent can be heated to a constant temperature in the range of 50 to 90 ° C. until immediately before spraying.
[0019]
Next, the operation of the release agent spraying device 13 of the present embodiment will be described. Hereinafter, molding of a mobile phone housing made of a magnesium alloy AZ91D will be described as an example, but the present embodiment is not limited to this.
[0020]
In metal injection molding, a mold (not shown) composed of a fixed mold and a movable mold is closed, molten metal is injected, and the mold is opened after the measurement and cooling steps are completed.
[0021]
After removing the molded mobile phone casing, the nozzle unit 1 of the release agent spraying device 13 is lowered by the air cylinder 4 between the fixed mold and the movable mold. In order to remove burrs and the like, a first air blow for blowing air from the nozzle 11 'is performed.
[0022]
Next, the aqueous solution of the release agent heated by passing through the heating tank 6 is mixed with air and sprayed from the nozzle 11 onto the mold. The temperature of the aqueous solution of the release agent sprayed from the nozzle 11 is set to be 60 to 70 ° C. Since the fluidity of the aqueous release agent solution is stabilized by being heated to a certain temperature, a constant amount of the aqueous release agent solution is always applied to the mold surface, and it is difficult to lower the temperature of the mold. The product is not easily affected.
[0023]
Finally, in order to dry the release agent aqueous solution applied to the surface of the mold, air is again blown out from the nozzle 11 'to perform a second air blow, and one cycle of metal injection molding is completed.
[0024]
As described above, a favorable mobile phone housing made of magnesium alloy AZ91D was obtained.
[0025]
As described above, the release agent spraying device of the present embodiment is not configured to supply the heated aqueous solution of the release agent to the nozzle 11 via a piping system such as the release agent piping 2, but instead of the heating tank 6. Since the supply section is directly attached to the inflow section of the branch block 5, the heated release agent aqueous solution can be sprayed from the nozzle 11 without being affected by heat radiation from the piping system. That is, since the heating tank 6 heats the aqueous solution of the release agent immediately before being sprayed to a constant temperature to stabilize the fluidity of the aqueous solution of the release agent, a fixed amount of the aqueous solution of the release agent is always applied to the mold surface. Can be applied. In addition, since the release agent spray device of the present embodiment sprays the heated release agent aqueous solution onto the mold, it is difficult to lower the surface temperature of the mold.
[0026]
In the above embodiment, if the air pipe 3 is heated and kept at a constant temperature in the range of 50 to 150 ° C., the temperature of the mold surface due to the air blow can be reduced.
[0027]
【The invention's effect】
As described above, according to the present invention, the temperature of the aqueous solution of the release agent immediately before being sprayed from the nozzle is stabilized to stabilize the fluidity of the aqueous solution of the release agent. It can be applied to the mold surface. Further, since the heated aqueous solution of the release agent is sprayed onto the mold, it is possible to reduce the adverse effect on the molded article caused by lowering the surface temperature of the mold.
[Brief description of the drawings]
FIG. 1 is a front view of a release agent spraying device according to an embodiment of the present invention.
FIG. 2 is a side sectional view of a heating tank of the release agent spraying device shown in FIG.
FIG. 3 is an overall configuration diagram of an example of a conventional release agent spray device.
FIG. 4 is a view of the release agent spraying device shown in FIG.
[Explanation of symbols]
1 Nozzle part 2 Release agent piping 3 Air piping 4 Air cylinder 5 Branch block
6 heating tank
7 Heater 8 Adjustment plate 9 Bolt 11, 11 'Nozzle 13 Release agent spraying device 14 Thermocouple

Claims (1)

In a mold release agent spraying device for spraying a mold release agent aqueous solution on the surface of the mold to improve the mold releasability of the molded article from the mold,
A heating tank (6) having a heater (7) for heating a release agent aqueous solution supplied from the outside through a release agent pipe (2) and ejected from a plurality of nozzles (11) is provided by the release agent The heating tank (6 ) is disposed between a pipe (2) and the branch block (5) to which the nozzles (11) are connected and which distributes the aqueous solution of the release agent to the nozzles (11). ), Wherein the supply section is directly attached to the inflow section of the branch block (5) to which each of the nozzles (11) is connected .

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