JPS60227Y2 - Dice holding device for coated welding rod painting extruder - Google Patents

Description

[Detailed description of the invention] The present invention relates to a die holding device for a coating extruder used in the manufacturing process of coated welding rods, and in particular is configured to form a blowhole at the die fitting tip of the die holding fitting. This prevents coating material residue from adhering to the outer peripheral surface of the coated welding rod.

A coated welding rod (hereinafter simply referred to as a welding rod) 1 is generally commercially available in the form shown in FIG. 1, and has a coating material 3 applied around a core wire 2 made of mild steel or the like.

On the other hand, in manufacturing the coated rod 1, a coating machine as shown in FIG. 2 (a sectional view of the main part) is used, for example.

That is, the tip of the coating material pressurizing chamber 3a is opened in a part 4 of the coating station main body, and a ring body 7 in which a cylindrical die 6 is fitted and supported is supported by the die mounting lid 5. The core wires 2 are successively pushed out in the direction of the arrow through a nipple 8 fixedly installed toward the center of the opening.

Further, the die 6 is arranged concentrically with the core wire 2.

The coating material filled in the pressurizing chamber 3a is extruded together with the core wire 2 through the die 6 to form the coated rod 1.

The coated rod 1 coated in this manner is dried and then manufactured by scraping off the coating material on its tip 2a and rear end 2b (FIG. 1).

Furthermore, since the layer of coating material 3 is required to have a uniform thickness,
A device is required that is equipped with a means for eccentrically adjusting the die 6 with respect to the core wire 2 being fed, and as shown in FIG. Indicates what to adjust.

However, the coating material 3 extruded from the tip side of the die 6 has fluidity, and the compression from the periphery by the die 6 is suddenly released at the exit, causing it to scatter or warp at the exit. They may adhere to the area around the exit of the die, accumulate and adhere to the circumferential surface of the re-coated rod, resulting in a defective product.

In other words, Figures 3 and 4 illustrate these.
In the figure, when the die 6 is relatively new, the residue generated at the outlet end of the die 6 is a powder 9.

However, as the die 6 wears out, more scum is produced and the coating material is consumed more, and the scum in this case becomes a ring-shaped substance 9b around the exit end as shown in Fig. 4.
Instead of falling like 9a, it sticks to the coated rod 1 like knots 9c, forming a defective product.

Therefore, it has been considered to prevent the accumulation of scum at the exit end of the die, and a method has been adopted in which a blow nozzle is disposed in this area to immediately scatter the generated scum.

These fume devices include those in which a plurality of fume nozzles 10 are oriented toward the outlet end as shown in FIG. Types with a blow nozzle drilled into them were tested.

As a result, powdery particles 9 as shown in Fig. 3 can be easily scattered, but ring-shaped objects 9b as shown in Fig. 4 can be easily dispersed.
It cannot be dispersed.

Therefore, increasing the fumarole pressure has been considered, but the fumarole noise reaches extremely high levels of <100 phon A, necessitating noise countermeasures, and has not been adopted immediately.

The generated residue also changes depending on the type of coating material,
Even if the die is new, a ring-shaped substance 9b may be generated, and the die of a coating extruder is replaced after its normal life due to diameter wear.

The present invention was developed with these points in mind, and an attempt was made to improve the shape of the outlet end of the mass die to prevent the generation of dross, but this was not completely satisfactory.

Therefore, as a result of considering the direction of the fumarole to act on the outlet end and the formation of these fumarole holes, we arrived at the present invention,
It is an object of the present invention to provide a die holding device which can sufficiently scatter and remove generated dross even with a small amount of air pressure, and which can form blowholes by assembling a die holding fitting.

This type of holding device is such that when the die is supported, the blowholes form a jet stream along the tip of the die, and its structure consists of a die fitting provided on the die holding fitting. An air chamber for introducing pressurized air is formed around the tip of the hole, and a scarlet rod passing hole is formed on the tip surface of the holding fitting and the die, the diameter of which is smaller than the outer diameter of the die, and the air chamber is formed on the side of the contact surface with the die. It is constructed by abutting pressure sources forming radial fume passage grooves communicating with the chamber.

The present invention will be explained in detail below based on the drawings, but the drawings show an example of a specific implementation of the present invention, and the present invention is not limited to these illustrated examples, but is constructed in accordance with the spirit described above and below. The same implementation is possible even if the shape of the member is changed or a part of the attachment is changed.

Fig. 5 is an explanatory cross-sectional view of the main parts of the present invention, Fig. 6 is a front view of a die holding device to which the present invention is applied, Fig. 7 is a cross-sectional view in the direction of the arrow along cutting line ■-■ in Fig. 6, The figure is a partially broken developed sketch showing a part of the structure in FIG. 7, and FIG. 9 is a sketch showing a partially opposite side of FIG. 8.

First, as shown in FIG. 5, an air chamber 12 is formed as an enlarged stepped portion around the tip side of the die holding fitting 11 provided with the fitting hole 11a for the die 6, and an air introduction path communicating with the air chamber 12 is formed. 13 is passed through the holding fitting 11.

It is recommended that the introduction passage 13 be at an angle of S゛45 degrees with respect to the core axis of the die 6, and although only one introduction passage 13 is shown in the lower part, multiple passages may be formed. good.

Some of the dies 6 are moved toward the tip side (toward the left in the drawing) by the pressing force 14 that is placed in contact with the sharp end side surface of the holding fitting 11.
Movement to the country is now regulated, and 14
A covered rod passage hole 15a having a smaller diameter than the outer diameter of the die 6 is formed in the die 6.

A fume passage 15 is formed on the side of the holding metal contacting surface of the pressing material 14 (on the right side in the drawing), and the fume passage 15 is connected to the ninth
As shown in the figure, it has a groove shape that is open on the contact surface (back surface) and is shaped radially toward the passage hole 15a.

Although the fumarole passages 15 are shown as having a cross shape on the back surface, more fume passages may be formed, or they may be formed in a spiral shape toward the passage hole 15a as shown by the dotted line in FIG. It may be tilted.

These fume passages 15 are communicated with the air chamber 12 formed in the holding fitting 11.

Therefore, the pressurized air introduced from the air introduction passage 13 fills the air chamber 12 to form a uniform pressure, and furthermore, a jet stream as shown by the arrow in FIG. 5 is formed via the jet passage 15.

The jet stream collides with the outer surface of the covered rod 1 along the tip surface of the die 6, and is ejected from the passage hole 15a of the pressing seat ring 14 in the direction of movement of the covered rod 1.

Therefore, the coating material residue generated at the end of the die 6 is
This jet stream scatters the debris and eliminates the adhesion of debris.

In addition, there is no possibility that debris adhering to the circumferential surface of the coated rod 1 will be carried around in the form of lumps, and defective products can be eliminated.

FIG. 6 is a front view of the pressing part of a coating extruder to which such a die holding device is applied.A die mounting base 17 is provided around the extruder, and the holding fitting 11 is built into the base 17.

The illustrated example shows that the die 6 and the holding fitting 11 can be eccentrically adjusted with respect to the core wire (not shown), and this adjustment is performed by a screw 19 for tightening.

That is, as shown in FIG. 7, the die mounting base 17 is provided at the opening at the tip of the coating material pressurizing chamber 3a of the coating apparatus main body 4 as illustrated in FIG.

Reference numeral 16 designates a guide member provided in the opening, which is attached to the main body of the painting station by an attachment element 17.

The mounting source 17 is a hollow portion 18 that is open on the back side.
The hollow portion 18 is preferably a hollow portion that forms a sufficient extra space on the outer peripheral side of the die holding fitting 11, and the extra space is configured as a pressurized air chamber.

On the other hand, a screw hole 17b is formed on the surface side of the cavity 18,
The screw hole 17b is concentric with the cavity 18 and has an inner diameter smaller than the outer diameter of the holding fitting 11.

Further, a tightening screw 19 is screwed into the screw hole 17b, and a locking hole 19a for a tightening material is formed in the screw hole 19, and by tightening, the holding fitting 11 and the pressing material 14 are attached to the guide member 16 side. Press and hold.

Further, an air 1 introduction hole 17a communicating with the cavity 18 is formed in a part of the mounting base 17, and a pressurized air introduction hose 17d (FIG. 6) is connected by threading a nipple 17c.

Therefore, the pressurized air introduced from the hose 17d fills the cavity 18 and is introduced into the air chamber 12 through the air introduction passage 13 formed in the holding fitting 11, and is generated as explained in FIG. It becomes a jet stream for removal.

The back side of the mounting bracket 11 has a protruding stepped portion 11c in the center.
(Fig. 8), a cavity is formed between the surface of the guide member 16, and the air introduction passage 13 opens at a position where the protruding step 11c is removed. .

Since the present invention is constructed in this way, the jet stream for removing generated debris that is blown onto the die tip surface is ejected from the periphery of the die tip surface and along the surface, so the conventional blowing is extremely difficult compared to air pressure. The generated debris can be scattered even with a small pressure, and the fume port can be formed by simply assembling the die, without requiring the trouble of forming the fume port on the die mounting bracket as in the conventional method.

Also, there is no need to improve the die at all, just use the conventional one)
Can be used interchangeably.

From this, it is possible to reduce the number of defective coated rods, reduce the coating cost, and streamline the coating coating process for coated welding rods.

[Brief explanation of the drawing]

Fig. 1 is an explanatory view showing an example of a coated welding rod, Fig. 2 is an explanatory cross-sectional view showing the main parts of a conventional coating station, and Figs. 3 and 4 are a cross-sectional view and side view to explain the generation of coating material scum. Figure 5 is a cross-sectional view to explain the main parts of the tie holding device of the present invention, Figure 6 is a front view of a portion of the paint rack to which the present invention is applied, and Figure 7 is along the cutting line ■-■ of Figure 6. 8 is a partially cutaway sketch showing a part of the structure of FIG. 7, and FIG. 9 is a rear view of some parts in FIG. 8. 1...Coated welding rod, 2...Core wire, 3.
...Coating agent, 4...Painting station body, 5.
...Dice mounting lid, 6...Dice, 7.
...Dice holding ring, 8...Nipple, 9
......Coating material residue, 10...Blow nozzle, 11...Holding fitting, 12...Air chamber, 13...Air introduction path , 14... Pressing origin, 15... Fumarole passage, 16... Guide member, 17... Die mounting seat ring, 18...
...Cavity part, 19...Tightening screw.

Claims (1)

[Scope of utility model registration request] This is a die holding device for a coated welding rod extruder that applies pressurized coating material to the core wire, and includes an air chamber for introducing pressurized air around the tip side of the die fitting hole provided in the die holding fitting. At the same time, a covered welding rod passing hole has a smaller diameter than the outer diameter of the die, and a radial blow passage groove communicating with the air chamber is formed on the end surface of the holding fitting and the die, and the diameter is smaller than the outer diameter of the die. A die holding device for a coated welding rod coating extruder, characterized in that it is constructed by abutting a pressing ring seat.