JPH03204151A - Static electricity generating device for applying powdery lubricant in horizontal type injection sleeve - Google Patents

Abstract

PURPOSE:To instantaneously apply powdery lubricant on inner circumferential face of a injection sleeve with generated static electric field by inserting an electrode bar into the injection sleeve with movement of electrode inserting cylinder fitted as inclining-state toward molten metal supplying hole and centering the electrode to axial center of the injection sleeve with an electrode centering cylinder. CONSTITUTION:The electrode bar (a2) is inserted into the injection sleeve B from the molten metal supplying hole 1 with inserting movement of the electrode inserting cylinder (a3) set as fitting as inclining-state to the injection sleeve B side toward the molten metal hole 1 direction. Successively, the inserted electrode bar (a2) is aligned with axial center line X in the injection sleeve B with the electrode centering cylinder (a4) for executing the centering following the above inserting movement fitted to the electrode inserting cylinder (a3). Therefore, the static electric field for powdery lubricant electric charge is generated between the electrode bar and inner circumferential face of the injection sleeve B and the powdery lubricant supplied on the injection sleeve B can be instantaneously applied on the inner circumferential face (b1) of the injection sleeve B.

Description

[Detailed description of the invention] <Industrial field of application> The present invention is incorporated into a horizontal injection die-casting machine, and injects and fills molten metal into a mold cavity by the horizontal injection operation of an injection cylinder. The present invention relates to an electrostatic generation device that applies powdered lubricant to the inner circumferential surface of an injection sleeve using electrostatic adsorption.

<Conventional Technical Background and Problems Therein> Conventionally, liquid lubricants such as water-soluble and oil-based lubricants are generally used as lubricants applied to the inner circumferential surface of injection sleeves.

However, when the liquid lubricant is applied to the inner peripheral surface of the injection sleeve, the sleeve temperature (inner peripheral surface temperature) is lowered by the liquid lubricant, and the molten metal poured into the injection sleeve solidifies more quickly. As a result, the solidification rate of the molten metal within the injection sleeve increases, resulting in the occurrence of defective products such as poor hot water circulation.

In addition, in the past, since a liquid lubricant was used, it was necessary to dry the lubricant by air blowing after applying the lubricant, which is preferable in order to further shorten the casting cycle (each cycle operation) of the casting apparatus. It wasn't something.

Therefore, the present applicant proposed that when applying a lubricant to the inner circumferential surface of the injection sleeve as a lubricant in place of a water-soluble or oil-based liquid lubricant, there is no risk of causing a drop in the temperature of the sleeve; We have previously developed and proposed a new powder lubricant that forms a heat insulating layer between the surface and the surface.

When applying powdered lubricant to the inner circumferential surface of the injection sleeve, a wide variety of application methods have been considered. In the casting method that uses liquid lubricants, it is necessary to automatically apply the powder lubricant in the same way as with known liquid lubricants. The applicant noticed that the electrostatic coating method was the most preferable coating method, and developed it.

<Problems to be Solved by the Invention> The present invention provides an electrode within the injection sleeve that generates an electrostatic field for charging powdered lubricant between the inner peripheral surface of the injection sleeve in conjunction with the casting cycle of a die-casting machine. A technical object of the present invention is to provide an electrostatic generation device that can be inserted into and taken out freely and can easily and reliably apply powdered lubricant to the inner circumferential surface of an injection sleeve.

<Means for achieving the technical object> The technical means taken by the present invention to achieve the above object is to generate an electrostatic electric field between the wire connected to the high voltage generator and the inner peripheral surface of the injection sleeve. an electrode rod that inserts the electrode rod into the injection sleeve from the hot water supply port; and an electrode insertion cylinder that inserts the electrode rod into the injection sleeve from the hot water supply port; The electrode insertion cylinder is installed and arranged in an inclined manner on the side of the injection cylinder facing toward the hot water supply port, and the electrode alignment cylinder is installed and supported in a substantially vertical manner on the electrode insertion cylinder. At the same time, the rear end of the electrode rod is fastened and supported by this electrode centering cylinder, and the electrode rod is installed in an obliquely protruding shape facing toward the supply port, and the middle part of the rear end side of the electrode rod is bent. This is because the rod is formed into a substantially angular shape from the insertion part and the centering relief part.

<Operation> According to the above-mentioned technical means of the present invention, the electrode insertion cylinder starts the insertion operation (advance) from its retreat waiting limit, moves the electrode rod forward together with the electrode alignment cylinder, and Insert the electrode rod into the injection sleeve through the hot water supply port. When the electrode rod is inserted into the injection sleeve and the electrode insertion cylinder stops at its forward limit and the insertion operation is completed, the electrode alignment cylinder starts to move downward at the same time as the insertion operation ends, and the electrode insertion cylinder stops at its forward limit and the electrode alignment cylinder starts to move downward. The electrode rod inserted into the sleeve is aligned so that it is aligned with the axis of the sleeve.

At this time, the centering relief part on the rear end side of the electrode rod 1 which is fastened and supported by the electrode centering cylinder allows the inserted part to be aligned with the axis of the injection sleeve without coming into contact with the mouth edge of the hot water supply port. An electrostatic electric field is generated between the injection sleeve and the inner circumferential surface of the injection sleeve, the powdered lubricant blown into the injection sleeve is charged, and the powdered lubricant is instantaneously adsorbed and applied to the inner circumference of the injection sleeve. .

<Example> An example of implementation of the present invention will be described below based on the drawings.

The static electricity generator (A) of this embodiment is a high voltage generator (al
) is wire-connected to the inner peripheral surface (bl) of the injection sleeve (B).
An electrode rod (al) that generates an electrostatic field between
Following the insertion movement of the electrode insertion cylinder (a,), the electrode rod (al) inserted into the injection sleeve (B) is inserted into the injection sleeve (
Electrode alignment cylinder (a) that can be aligned on the axis line (X) of B)
4), and a high voltage is applied by the high voltage generator (al) to the electrode rod (al) inserted along the axis (X) of the injection sleeve (B) to generate the electrode rod (C2). ) and the inner circumferential surface (bl) of the injection sleeve (B), thereby electrifying the powdered lubricant blown into the injection sleeve (B) and causing the injection sleeve ( Instantly adsorb and apply to the inner circumferential surface (bl) of B).

The electrode insertion cylinder (a,) is a rodless cylinder that operates using pressure oil or the like as a working medium, and the injection sleeve (
A fixture (2) installed on the cylinder head (C1) of the cylinder (C) and a fixed platen (D) of the die-casting machine (D) are attached to the side of the injection cylinder (C) facing the hot water supply port (1) of B). dl) to the injection cylinder (C), and are fixedly supported by the fixtures (4) installed on the bridging plate (3), respectively, and arranged in an inclined manner. Install the alignment cylinder (C4) and high voltage generator (al).

The angle of inclination of this electrode insertion cylinder (C3) toward the hot water supply port (1) can be freely changed by adjusting the front and rear fittings (2) and (4). The working medium supply device for supplying the working medium is linked to the control unit of the die casting machine (D), and is automatically connected to the electrode insertion cylinder (
a,) is set to start the insertion operation and insert the electrode rod (C2) into the injection sleeve (B).

The electrode alignment cylinder (C4) is the electrode insertion cylinder (C
At the end of the insertion operation in 3), the injection sleeve (
B) The electrode rod (C2) inserted into the sleeve (B)
The movement along the axis (X) of the injection sleeve (B)
When the powdered lubricant is adsorbed and applied to the inner circumferential surface (bl) of the hot water supply port (1) from inside the injection sleeve (B) by the backward movement of the electrode rod (C2) or the electrode insertion cylinder (C3).
This is a rodless cylinder similar to the electrode insertion cylinder (C3), and the cylinder tube is inserted into the electrode insertion cylinder (C3).
C3) is fastened and supported by the slide block (300) and installed vertically, and the rear end of the electrode rod (C2) is fastened and supported by the lower moving block (400') via two support shafts (5). do.

Note that the working medium supply device that supplies the working medium to this electrode alignment cylinder (C4) is connected to the control section of the die casting machine (D) like the electrode insertion cylinder (C3), and is controlled by the operation input to the control section. Depending on the timing, the operation is started at the end of the insertion operation of the electrode insertion cylinder (C3) and at the end of the suction application of the powdered lubricant.

The electrode rod (C2) has an insertion part (200) that has a length extending over the entire length of the injection sleeve (B), and a centering relief part (201) that is bent and connected from this insertion part (200). Further, the rear end portion of the centering relief portion (201>) is bent approximately parallel to the insertion portion (200), and the electrode block (202) is integrally attached to the portion by welding or the like. This electrode block (202) is inserted into an electrode holder (7) attached between the tips of the two support shafts (5) with bolts (6), and is fastened and supported by a plunger bolt (8). (See Figures 2 and 3).

The two support shafts (5) are mounted and supported at their rear ends on the lower moving block (40G) of the electrode alignment cylinder (C4) using the mounting holder (9), and then attached to the injection sleeve (B).
) is mounted in parallel toward the hot water supply port (1), and an electrode holder (7) is attached between the ends thereof with bolts (6).

Then, the plunger bolt (8) and the electrode insertion cylinder (a,) that fasten the electrode block (202> at the rear end of the electrode rod (C2) attached and supported by the electrode alignment cylinder (C4))
A high voltage generator (al) attached to the slide block (300') is connected by wiring using a high voltage cable (10).

In addition, (11) and (12) in the figure indicate that the electrode rod (C2) is inserted into and taken out from the injection sleeve (B).
This is a notch provided at the front and rear edges of the hot water supply port (1) to prevent contact with the mouth edge of the hot water supply port (1) of 2).

Next, the static electricity generator of this embodiment (A
) to explain the operation in conjunction with the die casting machine (D). First, the electrode rod (C2) is retracted from the electrode insertion cylinder (a3) so that it does not interfere with the feeding of molten metal into the injection sleeve (B) by the supply device. It is returned to the standby limit and waits at that position until the lubricant application work of the die-casting machine (D) is started (see FIG. 1).

Then, when applying lubricant, use the electrode insertion cylinder (a3).
is activated to start the insertion operation of the electrode rod (al), and move the electrode rod (al) forward together with the electrode alignment cylinder (a4) and the high voltage generator (al) to supply hot water to the electrode rod (al). Insert into the injection sleeve (B) from the opening (1) (4th
(see figure). When the electrode insertion cylinder (a,) stops at the forward limit and the insertion operation of the electrode rod (al) is completed, the electrode alignment cylinder (a4) starts the downward movement and the electrode rod (al) is inserted. Insert the insertion part (200') into the injection sleeve (B)
Perform alignment along the axis line (X) of (see Figure 5)
. When the electrode rod (al) is aligned by the electrode alignment cylinder (a4), a high voltage is applied to the electrode rod (al) by the high voltage generator (al), and the electrode rod (al) and the injection sleeve (B ) to generate an electrostatic field between the injection sleeve (B) and supply, for example, an electrode rod (al
), the powdered lubricant injected and supplied by the lubricant supply nozzle (E) inserted into and out of the injection sleeve (B) or the lubricant supply nozzle (E) directed to the hot water supply port (1) is charged; Inject the powder lubricant into the sleeve (B)
Instantly adsorb and apply to the inner circumferential surface (bl) of.

When the powder lubricant application work is completed, the electrode alignment cylinder (a4) starts to move upward, and the electrode rod (al
) in the original position in the injection sleeve (B) (position shown in Figure 4)
At the same time, the electrode rod insertion cylinder (a3) starts to move backward, pulls out the electrode rod (al) from the injection sleeve (B), returns it to the retracted standby limit, and waits there until the start of the next coating operation. let

Thereafter, the above operation is repeated during the lubricant application operation of the die-casting machine (D) to adsorb and apply the powdered lubricant blown into the injection sleeve (B) onto the inner peripheral surface (bl).

The powder lubricant used in this example may be a powder that is non-reactive with the molten metal, specifically a powder that has charging properties such as boron or talc, or a metal oxide, metal sulfide, or metal chisel. Examples of these include powders such as chemical compounds, cholera powder mixed with resin powder, etc. Among them, the lubrication of the plunger tip (F) to the inner circumferential surface (bl) of the injection sleeve (B) is particularly important. In order to improve the properties, it is preferable to use a powder that has self-lubricating properties in powder form.

<Effects of the Invention> Since the electrostatic generation device for applying powdered lubricant in the horizontal injection sleeve of the present invention is constructed as described above, it exhibits the following effects.

The electrode rod was inserted into the injection sleeve from the hot water inlet by the insertion operation (forward movement) of the electrode insertion cylinder, which was installed and arranged in an inclined manner on the injection cylinder side toward the hot water inlet, and the inserted electrode rod was attached to the electrode insertion cylinder. The electrode can be aligned along the axis of the injection sleeve by an electrode alignment cylinder that aligns the electrodes by following the insertion operation.

Therefore, in conjunction with the casting cycle of the die-casting machine, an electrostatic field for charging the powder lubricant is generated between the inner peripheral surface of the injection sleeve and the powder lubricant supplied into the injection sleeve is transferred to the injection sleeve. It can be easily and reliably applied to the inner circumferential surface instantaneously by electrostatic adsorption.

Therefore, the intended purpose was achieved.

[Brief explanation of drawings]

The drawings show an example of the implementation of the static electricity generating device of the present invention, and FIG. 1 is a front view showing the electrode rod in a standby state at the retraction standby limit of the electrode insertion cylinder, and FIG. 2 is a partially enlarged plan view. Figure 3 is a longitudinal sectional front view of the same, Figure 4 is a front view showing the electrode rod inserted into the injection sleeve, and Figure 5 shows the electrode rod aligned on the axis of the injection sleeve. FIG. 6 is a front view showing the state in which the device has been removed. In addition, in the figure (A): Static electricity generator (a,): High voltage generator (a,): Electrode rod (200)
: Insertion part (201) : Core stand relief part (a3) : Electrode insertion cylinder (a4) : Electrode core metal cylinder (B) : Injection sleeve (b.) : Inner peripheral surface (1) : Hot water inlet patent

Claims (1)

[Claims] an electrode rod that is wire-connected to a high voltage generator and generates an electrostatic field between the inner peripheral surface of the injection sleeve; and an electrode insertion cylinder that inserts the electrode rod into the injection sleeve from the hot water supply port;
It consists of an electrode alignment cylinder that follows the insertion movement of the electrode insertion cylinder and aligns the electrode rod inserted into the injection sleeve on the axis of the injection sleeve, and the injection cylinder is directed toward the hot water supply port. An electrode alignment cylinder is installed and supported in a substantially vertical manner on the electrode insertion cylinder, and the rear end of the electrode rod is fastened and supported by the electrode alignment cylinder to support the electrode rod. A horizontal type, characterized in that the electrode rod is attached in a diagonally protruding shape toward the supply port, and the electrode rod is bent at the middle part on the rear end side to form the electrode rod into a substantially square shape from the insertion part and the centering relief part. Electrostatic generator for powder lubricant application on injection sleeves.