JPH0723094Y2 - Lubricant scattering prevention mechanism of powder lubricant application device in vertical injection sleeve - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention is to move the plunger tip forward from the ground side (reverse limit) toward the top side (forward limit) to move the molten metal into the cavity of the mold. In a die casting machine with a vertical injection mechanism that injects into the interior, a lubricant scattering prevention mechanism for a coating device that electrostatically applies powdered lubricant to the inner peripheral surface of the vertical injection sleeve by using the charging action It is about.

<Background of Prior Art> Conventionally, a liquid lubricant such as water-soluble or oil-based is generally used as a lubricant applied to the inner peripheral surface of this type of vertical injection sleeve.

However, when the liquid lubricant is applied to the inner peripheral surface of the injection sleeve, the temperature of the sleeve (inner peripheral surface temperature) is lowered by the liquid lubricant, and the molten metal poured into the injection sleeve accelerates solidification. As a result, the solidification rate of the molten metal in the injection sleeve becomes high, which causes defective products such as defective molten metal.

Further, since a liquid lubricant has been conventionally used, it has to be dried by air blowing after application of the lubricant, which is preferable in order to further shorten the casting cycle (every one cycle operation) of the casting apparatus. It wasn't something.

Therefore, the applicant of the present application has no risk of causing the effect of the sleeve temperature when the lubricant is applied to the inner peripheral surface of the injection sleeve as a lubricant replacing the liquid lubricant such as water-soluble or oil-based lubricant. We have developed and proposed a new powdery lubricant that forms a heat insulating layer that forms a void with a heat insulating effect.

When applying the powdered lubricant to the inner peripheral surface of the injection sleeve, various coating methods have been considered, but it is performed for the purpose of producing a large amount of casting products at a high speed, such as the die casting method. In the casting method that is used, it is necessary to automatically perform the coating action as in the case of the known liquid lubricant. The applicant of the present invention paid attention to the fact that the electrostatic coating method of electrostatic coating is the most preferable coating method, and has developed and manufactured a coating apparatus that realizes the electrostatic coating method.

However, after the injection nozzle of the coating device is inserted forward from the upper opening portion of the injection sleeve that is stopped and waits at the pouring position of the molten metal to the insertion limit within the injection sleeve, the injection nozzle is retracted while the injection nozzle is retracted. The powder lubricant that has been sent to the powder injection port at the tip through the powder flow path is charged into the injection port and injected into the injection sleeve, and the powder lubricant is applied to the inner peripheral surface of the injection sleeve. In the process of electrostatically applying the powder, a part of the powdery lubricant may be scattered to the outside from the upper opening of the injection sleeve, which may deteriorate the working environment around the die casting machine.

<Problems to be solved by the invention> The present invention effectively and reliably electrostatically applies powdery lubricant to the inner peripheral surface of the injection sleeve within the set time of the coating operation linked to the casting cycle of the die casting machine. It is a technical object to provide a lubricant splattering prevention mechanism of a coating device that prevents the powdery lubricant fed into the injection sleeve and sprayed under the coating operation from splattering to the outside from the upper opening. Is.

<Means for Achieving the Technical Problem> The technical means taken by the present invention to achieve the above-mentioned problems is to provide a molten metal on the outside of an injection nozzle that is inserted into and removed from an injection sleeve of a powder lubricant applying device. The lid body for closing the upper opening portion of the injection sleeve which serves as the pouring port is provided so as to be movable in the cylinder direction.

<Operation> Therefore, according to the above-described technical means of the present invention, when the injection nozzle of the powder lubricant applying device starts to be inserted into the injection sleeve and moves forward, it is provided outside the injection nozzle. The lid closes the upper opening of the injection sleeve when the nozzle reaches the desired forward position. Then, the injection nozzle advances to the insertion limit while the upper opening is closed by the lid, and while retreating from the insertion limit, the powder lubricant charged in the injection sleeve is discharged from the powder injection port at the tip. The powder lubricant is electrostatically applied to the inner peripheral surface of the injection sleeve by feeding and spraying, and after the application work is completed, the lid body is separated from the upper opening of the injection sleeve and the opening is opened and returned to the backward limit. Be done.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.
In this embodiment, the coating device (A) is a jet nozzle (a ₁ ).
And a high voltage generator (a ₂ ) that is connected to the electrode wire (1) built into this injection nozzle (a ₁ ) with a high voltage cable ( ₂ )
When the injection nozzle (a ₁₎ consist of a cylinder to be inserted freely out into the injection sleeve (B) (a _3), the fixed platen of the die casting machine (C) (c ₁₎ are brought tilted position behind the side stand The injection nozzle (a ₁ ) is inserted by the cylinder (a ₃ ) into the injection sleeve (B), and the powder lubricant is sent from the injection nozzle (a ₁ ) to the inner peripheral surface of the injection sleeve (B) to inject it. Apply electrostatically.

The injection nozzle (a _1), the upper opening (b ₁₎ the plunger tip (D) is fitted挿待machine cell bottom near the long heat-resistant long elongated tubular than is lead to the injection sleeve (B) It is made of a resin material, and two electrode wires (1) are embedded and embedded in the outer cylinder direction, and the tips (1a) of both electrode wires (1) are attached to the inner peripheral surface of the powder injection port (100). Connected to the support block (4), the rear end opening of which is fixedly supported by the tip of the rod (300) of the cylinder (a ₃ ) via the bracket (3) by the connecting tool (5). It is threadedly connected and supported by the support block (4) (see FIG. 2).

The cylinder (a ₃ ) is fixed to and supported by a supporting rod (6) which is attached to the rear surface of the fixed plate (c ₁ ) of the die-casting machine (C) and horizontally arranged, and waits at a tilted position where molten metal is poured. The injection sleeve (B) is inclinedly arranged above the upper opening (b ₁ ) along the axial extension line of the injection sleeve (B).

The rear end of the electrode wire (1) built into the injection nozzle (a ₁ ) is connected to the high voltage generator (a ₂ ) installed on the rear surface of the fixed plate (c ₁ ) of the die casting machine (C) and the high voltage cable (2). ), And a high voltage is applied between the tips (1a) of both electrode wires (1) protruding by the high voltage generator (a ₂ ) to form the powder flow path (101) of the injection nozzle (a ₁ ). Powder injection port at the end of the street (10
0) The powdered lubricant sent to the vicinity is charged.

In the figure, (7) is the powder flow path (101) of the injection nozzle (a ₁ ).
The powder flow path (10) of the injection nozzle (a ₁ ) piped over a lubricant supply device (not shown) that supplies powdered lubricant to
It is a lubricant supply hose which is circulated with 1) and connected to the support block (4).

Then, a lid body (a ₄ ) for closing the upper opening portion (b ₁ ) of the injection sleeve (B) is provided on the outside of the injection nozzle (a ₁ ) of the coating device (A) configured as described above, and the lid body (a ₄ ) has a substantially entire cylinder length. It is provided so that it can move freely.

The lid (a ₄ ) is made of a desired material such as a steel plate in a size that hermetically closes the upper opening (b ₁ ) of the injection sleeve (B). A guide tube (8), which is loosely slidably mounted on the outside of (a ₁ ), is attached to the lower surface, and a Teflon plate (9) is provided on the lower surface in consideration of adhesion with the opening edge surface of the upper opening (b ₁ ). ) Is attached.

Thus, the lid (a ₄ ) is fitted to the outside of the injection nozzle (a ₁ ) by the guide cylinder (8) so as to be movable in the cylinder direction, and the stopper (a ₁ ) is attached to the tip end side of the injection nozzle (a ₁ ). It is received and attached by its own weight to the tip side of the injection nozzle (a ₁ ) by 10).

In the figure, (11) is a hose joint attached to the lid (a ₄ ),
The hose joint (11) is connected to a suction hose (12) which is connected to a suction device (not shown) through a pipe, and the electrostatic hose is passed through the suction hose (12) to the inner peripheral surface of the injection sleeve (B). Collect the excess powder lubricant that remains unapplied.

Next, the coating device (A) equipped with the lid (a ₄ ) as described above.
The operation in conjunction with the die-casting machine (C) will be explained. First, the injection nozzle (a ₁ ) is returned to the backward rising limit that does not interfere with the hot water supply operation of the molten metal into the injection sleeve (B). The die casting machine (C) waits at the backward rising limit until the start of the lubricant application work (see the chain double-dashed line in FIG. 1).

Then, at the time of applying the lubricant, the cylinder (a ₃ ) is activated and the injection nozzle (a ₁ ) is advanced and inserted to the insertion lower limit of the injection sleeve (B). At this time, the lid body (a ₄ ) has an upper opening (b ₁ ) of the injection sleeve (B) when the injection nozzle (a ₁ ) reaches a forward position where the injection nozzle (a ₁ ) is inserted into the injection sleeve (B).
Close the lid. After the lid body (a ₄ ) closes the upper opening (b ₁ ) of the injection sleeve (B), the injection nozzle (a ₁ )
Moves forward to the insertion limit by itself.

When the injection nozzle (a ₁ ) reaches the insertion limit, the cylinder (a ₃ ) stops, so-called stroke limit, and the high voltage generator (a ₂ ) applies high voltage to both electrode wires (1). a ₁ ) An electrostatic electric field is generated between the tips (1a) of both electrode wires (1) facing the powder injection port (100) at the tip, and fed into the powder channel (101) by the lubricant supply device and supplied. The powdered lubricant thus obtained is sprayed from the powder ejection port (100) toward the inner peripheral surface of the injection sleeve (B) while being charged while passing between the tips of the electrode wires (1). Simultaneously with the start of the injection, the injection nozzle (a ₁ ) is gradually retracted and raised by the cylinder (a ₃ ) and the electrostatic field generated between the injection nozzle (a ₁ ) and the inner peripheral surface of the injection sleeve (B) causes the powder to spread over the entire inner peripheral surface. The lubricant is instantaneously electrostatically applied.

Then, when the injection nozzle (a ₁ ) reaches the retracted and raised position in the injection sleeve (B), for example, a stopper (10) attached to the outside of the tip of the injection nozzle (a ₁ ) hits the lid (a ₄ ). When reaching the retracted and raised position to contact, the injection of the powdered lubricant from the powder injection port (100) is stopped to end the application work, and the lid (a ₄ ) is attached to the upper opening of the injection sleeve (B). (b ₁₎ back to the injection nozzle (a ₁₎ is retracted to the retracted ascent limit with the lid (a ₄₎ while allowed opening a (b ₁₎ opening away from, the following coating operations at the ascent limit Wait until the start.

After that, the above operation is repeated during the lubricant applying operation of the die casting machine (C) to electrostatically apply the powdery lubricant to the inner peripheral surface of the injection sleeve (B).

FIG. 4 shows another embodiment. In this embodiment, the lid (a ₄ ) mounted so as to be movable in the cylinder direction is attached to the stopper (10) side, which is attached to the outside of the tip of the continuous injection nozzle (a ₁ ). When the injection nozzle (a ₁ ) is energized and the injection nozzle (a ₁ ) moves backward in the injection sleeve (B) from the forward downward limit to the retracted upward position, the lid (a ₄ ) causes the injection sleeve (B) to move. A pressure spring (13) is wound around the outside of the injection nozzle (a ₁ ) so as not to separate from the upper opening (b ₁ ) of the.

<Effect of the Invention> As described above, the present invention closes the upper opening of the injection sleeve that serves as a pouring port for the molten metal on the outside of the injection nozzle that is inserted into and removed from the injection sleeve of the powder lubricant applying device. Since the lid body is provided so as to be movable in the cylinder direction, the following operational effects are obtained.

During the process of inserting the injection nozzle into the injection sleeve forward, the upper opening of the injection sleeve is closed by the lid, and in this closed state, the injection nozzle is retracted from the insertion limit (advance lower limit) and the injection sleeve Since the powdery lubricant can be electrostatically applied to the inner peripheral surface, it is possible to reliably prevent the powdery lubricant from being scattered to the outside from the upper opening of the injection sleeve during the coating operation. Therefore, it is possible to prevent the work environment around the die casting machine from being deteriorated by the powder lubricant.

As described in detail in the examples, the powder lubricant fed to the powder flow path in the cylinder is electrically charged in the powder injection port of the injection nozzle that is inserted into and removed from the injection sleeve during the lubricant application operation. While spraying into the injection sleeve, the inner peripheral surface of the injection sleeve can be instantaneously electrostatically coated under the charging effect of static electricity. Therefore, it is possible to effectively and surely apply the powdery lubricant to the inner peripheral surface of the injection sleeve within the set time of the coating operation linked to the casting cycle of the die casting machine.

Therefore, the intended purpose could be achieved.

[Brief description of drawings]

The drawings show an example of the implementation of the lubricant scattering prevention mechanism in the powder lubricant applying device of the present invention. FIG. 1 is a front view showing a state where the lubricant is applied to a die casting machine, and FIG. Front view, FIG. 3 is a sectional view taken along line III-III of FIG.
FIG. 4 is a vertical cross-sectional front view of the main part showing another embodiment in an enlarged manner. In FIG. (A): the coating apparatus, (a _1): the injection nozzle (a _2): high voltage generator, (a _3): Cylinder (a _4): lid, (B): injection sleeve (b ₁ ): Upper opening, (1): Electrode wire

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A cylindrical injection nozzle having a powder flow path for a powdery lubricant in the cylinder, an electrode wire connected to a high voltage generator in a cylindrical direction, and a tip of the electrode wire. The cylindrical injection nozzle is projected onto the inner peripheral surface of the injection port, and the cylindrical injection nozzle is inserted into and removed from the injection sleeve through the upper opening of the injection sleeve, which serves as a pouring port for the molten metal, and is inserted into the inner peripheral surface of the injection sleeve. In a coating device for electrostatically applying a powdery lubricant, a lid for closing an upper opening portion of an injection sleeve is provided outside the injection nozzle so as to be movable in a cylindrical direction. Lubricant scattering prevention mechanism for powder lubricant application equipment.