JPH0452022Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a device for spraying a mold release agent onto a mold in a metal or plastic molding machine equipped with a fixed mold and a movable mold.

[Conventional technology]

The following types of release agent spray devices are generally known for molding machines using molds, such as die casting machines and plastic molding machines.

A spray gun is attached to the tip of the cylinder, and the spray gun is moved between the open molds by cylinder operation to spray a mold release agent from the front of the fixed mold and the movable mold onto the surfaces of the molds.

A spray gun is fixed to the outer periphery of the fixed mold and the movable mold, and a mold release agent is sprayed from the spray gun onto the opposing mold surfaces.

[Problem that the invention attempts to solve]

According to the conventional spray device, the device itself is large-scale, and the spray gun is moved between the open molds using a cylinder, so there is a problem that productivity is reduced accordingly. Further, in the conventional spray device, when the mold cavity is deeply carved, a blind spot is created in the spraying of the mold release agent, making it impossible to effectively spray the mold release agent to the intended location. Moreover, in the case of this conventional example, the air and mold release agent are mixed in the distributor and then introduced into the spray gun fixed to the mold via a single connecting pipe.
Although the mechanism can be simplified, the mold release agent remains in the connecting pipe that connects the distributor and the spray gun, and this comes out together with the next spray, resulting in the problem that the amount of spray is not constant. When molding products that require only a small amount of mold release agent, it is necessary to keep the amount of mold release agent sprayed constant at all times, since this has a large effect on quality.

[Means for solving problems]

In order to solve the above-mentioned conventional problems, this invention provides a plurality of recesses in the mating surfaces of a fixed mold and a movable mold, and sprays a mold release agent into each recess onto the opposing mold surface. Multiple spherical nozzles that can be adjusted in direction and angle are recessed from the mold mating surface and installed in communication with the air and mold release agent mixture chamber, and the piston is activated by introducing a portion of the spray air. Therefore, a double pipe is used to connect a distributor incorporating a mechanism for opening and closing the mold release agent passageway to the mold to which the spherical nozzle is attached, and air and mold release agent are supplied from the distributor to the mold to which the nozzle is attached. It is characterized in that these are separately introduced into the mold, and then sprayed from a spherical nozzle on top of the air mixture in the air mixture chamber within the mold.

[Effect]

When spray air is introduced into the distributor when spraying the mold release agent onto the molding die, a piston in the distributor is actuated by introducing a portion of the spray air into the piston chamber to open the mold release agent passage. will be released.
The spray air and mold release agent separated in the distributor flow separately in the double pipe and are introduced into the mold where the spherical nozzle is attached, and are mixed in the air mixture chamber inside the mold. It is atomized and sprayed from the spherical nozzle toward the opposing mold surface.

〔Example〕

Hereinafter, an embodiment of this invention will be described with reference to the drawings. This mold release agent spraying device will be described in detail below. A plurality of recesses 1a and 2a, for example, four recesses, are provided on the mold surface as shown in FIG. 1, and the mold is released as shown in FIG. A plurality of spherical nozzles 4, which spray the agent and whose spraying direction can be adjusted in angle, are installed as shown in Fig. 3, recessed from the mold mating surface and communicated with the air/mold release agent mixture chamber 5. .

6 is a nozzle holder that holds the spherical nozzle 4 screwed onto the opening thread of the air mixture chamber 5 so that the angle of the spray direction can be adjusted; 7 is a coil that presses the spherical nozzle 4 against the tip of the holder. The spring 8 is a spring holding screw with a tubular end screwed into the holder 6. Note that the mold 1,
2 is provided with a plurality of horizontal holes 9 communicating with each air mixture chamber 5 as shown in FIG. It is attached as shown in FIG. 4 through an inner tube 12.

20 is a distributor (manifold) installed at a position apart from the molds 1 and 2;
It is configured as shown in the figure. That is, in this distributor 20, compressed air (spray air) from a compressor 21 enters from an air inlet 23 via a solenoid valve 22, passes through an air supply path 24, and enters a branch hole 2.
A part of the air introduced into the branch hole 25 is introduced into the piston chamber 27 through the air supply path 26 to actuate the piston 38. enters a plurality (four in the embodiment) of flow rate adjustment chambers 29 having air adjustment screws 28, and is led out to a connection port 31 to which a connection fitting 30 is attached as shown in FIG. 30 through the ventilation passage 16a of the double-pipe side connecting fitting 16 to the connecting outer pipe 13 made of a flexible hose.

On the other hand, the mold release agent pressure-fed from the mold release agent tank 33 enters the liquid feeding paths 35, 36 from the mold release agent inlet 34, and turns on the solenoid valve 22 (this solenoid valve 22 (It is turned ON by the spray start signal issued after the molded product is taken out from the molded product, and turned OFF by the spray stop signal issued after a certain period of time). 27, the piston 38 resists the elasticity of the spring 37.
moves back and the mold release agent passage (liquid supply passages 36, 39) is opened, so the mold release agent in the liquid supply passage 36 is sent to the branch hole 40 through the liquid supply passage 39, and the mold release agent in this branch hole 40 is The mold release agent is supplied to the connection port 3 from a plurality of (four in the embodiment) flow rate adjustment chambers 42 with mold release agent adjustment screws 41.
The liquid is guided to the liquid feeding hole 43 which is open at the center of the connecting fitting 30 and the center hole 30b of the connecting fitting 30 is
6 through the central connecting pipe 16b to the connecting inner tube 14 made of a flexible nylon tube.

The double pipe of the connecting outer pipe 13 and the connecting inner pipe 14 is
A connecting fitting 15 as shown in FIG. 4 is screwed to the mold side connecting fitting 10 and the distributor side connecting fitting 30,
16 (One end connection fitting 15 screwed to the mold side connection fitting 10 is provided with a ventilation hole 15a and a center connection pipe 15b, and the distributor side connection fitting 3
The connecting fitting 16 screwed to the ventilation passage 1
6a and a central connecting pipe 16b)
By screwing this connection fitting, the air and mold release agent branched by the distributor 20 are separated between the distributor 20 and the nozzle mounting molds 1 and 2 to the inside of the mold. Connected to be introduced.

The spray air sent from the compressor 21 is introduced into the distributor 20 by the ON operation of the solenoid valve 22, and a part of this introduced air enters the piston chamber 27 provided in the distributor 20, and the piston 38 is moved back, and the liquid feeding paths 36 and 39 for the mold release agent that is pumped from the mold release agent tank 33 are opened. The spray air branched in the distributor 20 is then transferred to the ventilation holes 30 of each connection fitting 30.
a through the ventilation passage 16a of the double-pipe side connection fitting 16 to the connection outer tube 13 side made of a flexible hose, and then from the ventilation communication holes 15a, 10a of the other end connection fittings 15, 10 to the metal connection. The mixture enters the outer tube 11 and is guided through the horizontal hole 9 to the air mixture chamber 5 inside the mold, where it is atomized with the mold release agent introduced into the mold through a separate passage (described later). , the spray is sprayed from the spherical nozzle 4 toward the opposing mold surface.

On the other hand, the mold release agent pressure-fed from the mold release agent tank 33 is introduced into the distributor 20, and is branched via the liquid feeding paths 36 and 39 communicating with each other by the operation (retreat) of the piston 38 in the distributor. The respective mold release agents that are led to the holes 40 and branched are led to the connection inner pipe 14 made of a nylon tube through the center hole 30b of the connection fittings 30, 16 and the center connection pipe 16b, and then to the connection inner pipe 14 made of a nylon tube. Center connection pipe 15 of metal fitting 15
b, enters the metal fitting connection inner pipe 12 and is guided to the air mixture chamber 5 inside the mold, where it is atomized with the air mentioned above, and is sprayed from the spherical nozzle 4 to the opposing mold surface. It will be sprayed as soon as it reaches the area.

Figure 2 shows a state in which the mold release agent is being sprayed simultaneously on the opposing mold surfaces of the fixed mold 1 and the movable mold 2, but there is a risk that the mold release agents sprayed from both sides may collide with each other. In some cases, this can be dealt with by spraying one side at a time or by arranging the spherical nozzle 4 at a position where it will not be buffered in the case of simultaneous spraying.

[Effect of idea]

Since the mold release agent spraying device of this invention is as described above, the device itself is simple, and although it contributes to the improvement of productivity, it does not become a hindrance. In addition, since the spherical nozzle is fixed in the recess of the mold mating surface and sprays the mold release agent onto the opposing mold surface, there is no blind spot even with deeply carved molds. There is.

Furthermore, by making the spray nozzle spherical, the angle of the spray direction can be easily adjusted.
In addition, the distributor and the mold are connected with a double pipe, and the spray air and mold release agent are sent separately, and the air mixture is atomized in the air mixture chamber inside the mold, making it possible to release the mold. It is possible to eliminate the residual amount of the agent in the feeding path and to keep the spray amount of the mold release agent constant at all times.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the overall configuration of a mold release agent spraying device according to an embodiment of the present invention, and Fig. 2 shows a mold release agent sprayed onto opposing mold surfaces of a fixed mold and a movable mold. FIG. 3 is an enlarged sectional view of the - line part in FIG. 1, FIG. 4 is a sectional view showing a connection structure using a double pipe connecting the distributor and the mold, Figure 5 is a plan view of the distributor, Figure 6 is a right side view of the distributor, Figure 7 is a sectional view taken along line A-A' in Figure 5, and Figure 8 is B-B' in Figure 5. Line sectional view, No. 9
The figure is a sectional view taken along line CC' in FIG. 5, and FIG. 10 is a sectional view taken along line D-D' in FIG. 1...Fixed mold, 2...Movable mold, 1a, 2a
... recess, 3 ... mold cavity, 4 ... spherical nozzle, 5 ... air/mold release agent mixture chamber, 10 ...
Mold side connection fitting, 13...Double pipe outer pipe, 14...
...Inner pipe of double pipe, 15, 16...Both end connection fittings of double pipe, 20...Distributor, 21...Compressor, 22...Solenoid valve, 23...Air inlet for spray, 24, 26 ... Air supply path, 25 ... Branch hole, 27 ... Piston chamber, 28 ... Air adjustment screw, 29 ... Flow rate adjustment chamber, 30 ... Distributor side connection fitting, 31 ... Connection port, 33 ... mold release agent tank,
34...Mold release agent inlet, 35, 36...Liquid feeding path,
38... Piston, 39... Liquid feeding path, 40... Branch hole, 41... Release agent adjustment screw, 42... Flow rate adjustment chamber, 43... Liquid feeding hole.

Claims (1)

[Scope of utility model registration request] A device for spraying a mold release agent onto a mold in a metal or plastic molding machine equipped with a fixed mold and a movable mold. A plurality of spherical nozzles, which are capable of adjusting the angle of the spray direction for spraying the mold release agent onto the opposing mold surfaces within the recess, are recessed from the mold mating surface and communicated with the air/mold release agent mixture chamber. At the same time, a double pipe is used to connect the distributor with a mechanism that opens and closes the mold release agent passage using a piston that operates when a portion of the spray air is introduced, and the mold with the spherical nozzle installed. Air and a mold release agent are separately introduced into the nozzle-attached mold from the distributor, and are sprayed from a spherical nozzle onto the air mixture in the air mixture chamber within the mold. Release agent spray device for molding molds.