JPS5861994A - Drawing method for thin welding wire containing flux - Google Patents

Abstract

PURPOSE:To obtain a wire that does not leave lubricant efficiently by drawing the wire using a specified cassette roller die formed to a block by combining plural roller dies alternately, and thereby eliminating necessity of lubricant. CONSTITUTION:Unit cassette is formed by setting a bearing frame 7 on which a pair of grooved rollers 6 are mounted to a pair of assembling frame 8. A roller die block 3 is assembled by piling plural unit cassettes so that direction of drawing down is changed alternately by 90 deg.. Plural blocks 3 is disposed in series and a wire 2 in which flux is sealed is passed through continuously without adding lubricant. Thus, a welding wire that does not leave lubricant can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for drawing a flux-cored wire for welding, and in particular to a method for drawing a small-diameter wire using a cassette roller die that does not use a lubricant. □ While forming a metal strip into a U-shaped cross section, fill the formed strip with powdered slack in a flux filling section provided during the forming process, and then form it into a circular cross section and then form it into the desired shape. The wire was drawn to the desired diameter. In the case of a small-diameter flux-cored wire, the relatively large-diameter formed wire obtained as described above is used as a raw material, and the wire is supplied to a drawing die and subjected to drawing processing. In this drawing process, it is essential to use a wire drawing lubricant to prevent fusion between the metal wire and the die and to ensure normal wire drawing.

The wire drawing lubricant varies depending on the type of workpiece material, wire drawing conditions, etc.
BACKGROUND OF THE INVENTION Many types of lubricants are commercially available and are in use, broadly classified into pretreatment agents, dry lubricants, wet lubricants, and oil-based lubricants. The original purpose of such lubricants is to make the wire drawing process smoother, but it is necessary to completely remove them from the wire surface after use, and if lubricants adhere to the finished wire, This leads to various changes in appearance and secondary processing, as well as in the welding operation and the quality of the weld. For example, 8□j□□□□□□□□□□□□□□□3 remaining in the welding wire: 17
'/-)'' - Peeling inside the cable, torch, and chip.
The remaining lubricant may accumulate and deteriorate the wire feedability, or the remaining lubricant may become a hydrogen source, causing a decrease in the strength of the weld and the occurrence of defects such as blowholes.

For this reason, in the past, it has been usual to add an operation or step to remove the lubricant adhering to the surface of the finished wire material during or after the wire making process. As a means of removing lubricant,
There are cleaning methods using acids, organic solvents, etc., baking removal methods by heating, and scraping methods using wire buffs and the like. However, the cleaning method does not allow for deterioration of the enclosed flux due to the intrusion of the cleaning agent from the joints of the wires, rust formation on the wire surface, etc.
There are problems with the deterioration of the working environment, such as the odor of cleaning agents and the risk of fire. In addition, the heating removal method requires high-temperature heating, which causes problems such as deterioration of the flux, embrittlement of the wire itself, and high cost.Furthermore, the mechanical scraping method has the disadvantage that complete removal cannot be expected. .

The inventors of the present invention took into account the above points and conducted numerous experiments and research on a wire drawing method that can obtain a thin flux-cored wire of a desired diameter without using any wire drawing lubricant, which is popular among customers. By adopting a cassette roller die, which had never been used to produce flux-cored wire, they discovered a method of drawing wire that met their expectations.

That is, in the present invention, when performing secondary wire drawing processing to a desired thin diameter of a wire strand with flux sealed inside, a plurality of roller dies each consisting of a pair of small-diameter grooved rollers are alternately drawn so that the roller axes are perpendicular to each other. The formed wire is drawn in the absence of lubricant using a cassette roller die which is assembled into a block shape, and two or more blocks of the cassette roller die are arranged in a row to pass the wire. The wire is drawn to a desired diameter. As a result, in the present invention, it is possible to manufacture a small-diameter flux-cored wire efficiently and completely eliminate problems caused by the use of lubricants, and the gap between the joints of the wires can be made extremely small. be.

The wire drawing method of the present invention will be described in detail below.

FIG. 1 shows an embodiment of the wire drawing process of the present invention, in which 1 is a supply reel, 2 is a wire strand that is unwound and supplied from the reel 1,
3 is a cassette roller die (in the figure, three roller dies are combined) through which the wire 2 is passed; 4 is a capstan for pulling the wire placed on the mountain side of the cassette roller die 3; in the illustrated example, these cassettes A total of eight sets of roller dies 3 and capstans 4 are consecutively arranged to draw the wire in stages. Reference numeral 5 denotes a reel for winding up the flux-cored wire that has exited the final finishing die and has been made into a desired diameter.

The above wire drawing process indicates a secondary wire drawing process, and the supply reel 1 is formed by forming a strip plate into a U-shape, filling the inside with flux, and then forming it into a circular shape. The strands of wire are wound. Conventionally, this wire was drawn by passing it through a hole-shaped die, but the thinner the wire diameter or the higher the flux filling rate (the thinner the outer steel material is), the more the hole-shaped die is drawn. Wire breakage is easy with mold dies. If a cassette roller die is used as in the present invention, no unreasonable force is applied to the wire in the axial direction, and the distance between unit roller dies can be made equal to or less than the diameter of the roller using small diameter rollers. The twist of the wire can be reduced and good wire drawing can be performed.

The cassette row 2 die used in the present invention is disclosed in Japanese Utility Model Application Publication No. 55-129506.

That is, as shown in FIG. 2, the unit cassette roller die is made up of two bearing frames 7 on which a pair of grooved rollers 6 are mounted, which are set in a pair of assembly frames 8 such that they can approach and separate from each other. The diameter of the hole formed by the pair of rollers can be arbitrarily changed by adjusting the separation and separation of the opposing bearing frames 7. In addition, the square bolt holes 9 are located exactly at the apex positions of the square, and when a plurality of unit cassette roller dies are stacked and assembled into one roller die block as shown in FIG. 3, each unit cassette roller die is Alternately roll the rollers in the direction of 90
You can change the settings by °.

Figure 4 shows the arrangement of only the roller parts of a four-layer roller die block, and the two adjacent row axes are 9
They are arranged alternately horizontally and vertically by 0°. Furthermore, due to the structure of this cassette roller die, adjacent rollers can be placed as close as possible within a diameter range, allowing smooth wire drawing and shortening the overall wire drawing line length.

In the present invention, the number of unit cassette roller dies in one block (one stand) is small (two are required), and it is preferable to have a plurality of blocks. You can decide by considering the diameter and final finished wire diameter.

Since the cassette roller die can be constructed very compactly, a large number of row and hole dies can be arranged even in a relatively small space, and therefore the reduction in area of each roller dies can be made small. As a result, it is possible to draw the wire rod sufficiently without increasing the size of the wire drawing knife using the capstan, and it is possible to perform a smooth wire drawing process without breaking the wire. By adding and reducing the area, the gap between the sheath seams of the flux-cored wire can be made extremely small.For example,
The minimum seam gap of flux-cored wire produced by conventional drawing was about 45μ.

According to the method of the present invention, the addition μ can be reliably suppressed to below. Since the cassette roller die is fixed with a hair ring and is a non-driving roller, there is a slight slippage between the wire rod and the surface of the roller die during wire drawing, but there is a slight amount of rust prevention attached to the steel strip, which is the raw material for the wire rod. The oil provides some tone and there is no problem with the capstan slipping. Therefore, no lubricant is added in the wire drawing process.

By the wire drawing method of the present invention described above, a small diameter flux-cored wire with stable quality and high dimensional accuracy can be obtained. In addition, since wire drawing can be performed without using lubricants, the lubricant application/charging process and lubricant removal process are unnecessary compared to conventional methods that required lubricants. , the manufacturing process can be reduced, and its industrial value is extremely large.

In addition, the gap between the seams of the resulting flux-cored wire becomes extremely small, and the encapsulated flux-cored powder does not leak.

Example A flux-cored wire of 2.8 mm in diameter, which was formed by enclosing and molding 18 types of blended fluxes containing rutile as a main component at a wire weight ratio of 18%, was used as a raw material and was then cut into three cassette roller dies (die diameter 35 m1, 1 block (block length 75mm) by combining 25mm distance between dice
The wire was drawn by sequentially passing through a total of 8 blocks of wire drawing roller dies. The wire drawing speed of the 8th block is 230m/am
Met. Note that no lubricant was added during wire drawing.

As a result, wire drawing can be performed well without breakage during wire drawing or roughening of the wire surface, and the difference in wire diameter for each block is between 0 and 1/100 mm, making it possible to fully use the wire for welding. did it.

FIG. 5 compares the seam gap between the wire obtained by the present invention and the wire obtained by the conventional method. It is clear that the wire according to the present invention has a narrower seam gap (no oil intrusion during skin pass), and is superior in temperature control.In addition, it has been found that the wire has better feeding properties on the wire surface after drawing. Apply a surface lubricant to the surface.6.

9 is welded to wire 10 for feedability and base circle guide.

As a result of investigating the existence of deposits in the conduit cable, torch, and chip, it was found that the arc pressure and the feed motor load DC were stable and no problems occurred.

[Brief explanation of drawings]

Fig. 1 is an overall schematic diagram of the drawing and wire equipment for carrying out the method of the present invention, Fig. 2 is a partial cross-sectional front view of a cassette roller die strip, and Fig. 3 shows the roller die shown in Fig. 2. It is a comparison chart of the wire seam gap of the invention and the comparative example. 1. Supply reel, 2. Wire wire, 3. Cassette roller die, 4. Capstan, 5. Take-up reel, 6. Grooved roller, 7. Bearing frame, 8. Assembly. Frame, 9-・Bolt hole. Patent Applicant Agent Patent Attorney Tomoyuki Yafuki (and 1 others)
Name] Figure 3 Flute Figure 5 Wire 1 Complete (77 + K)

Claims (1)

[Claims] When drawing a formed wire strand with 7 sixes sealed inside to a thinner diameter. The wire is drawn without the addition of lubricant using a cassette roller die constructed by combining a plurality of cassette roller dies consisting of a pair of small-diameter grooved rollers so that the wire rolling direction changes by 90 degrees, and forming a block shape. A method for drawing a small diameter flux-cored welding wire, characterized in that the blocks of the cassette roller die are arranged in two or more die rows, and the wire is drawn to a desired diameter by passing the wire continuously.