JPS5841020Y2 - Spool for welding wire - Google Patents

Description

[Detailed description of the invention] The present invention relates to a spool for welding wire, and in particular, the terminal end of the welding wire can be easily removed from the spool when replacing the spool-wound wire for welding, and the work of replacing the spool-wound wire during continuous welding is facilitated. This invention relates to a spool for welding wire that enables quick welding.

Most of the welding wires used for fully automatic welding and semi-automatic welding, including carbon dioxide arc welding and MIG welding, are
It is commercially available wound around a spool in units of about 10 kg or 20 hems.

For continuous welding, a large number of spool-wound wires are prepared and blown, and after one spool-wound wire is used, the terminal end of the wire is welded to the tip of a new spool-wound wire. However, this welding joint work is an important point that affects the operating rate of continuous welding.

However, the above welding joint work is surprisingly troublesome and time-consuming, and continuous welding has to be interrupted during this time.

That is, the winding start end of the spool-wound wire is latched onto the spool winding drum or flange portion, etc., as described below, and then
This is because its removal is troublesome, and the bending at that time remains intact, making welding work difficult.

Moreover, since the above-mentioned curvature significantly impedes the wire feeding performance, it is necessary to correct it or cut it out when performing a weld joint.

For example, Figures 1 and 2 show an example of how the end of the wire winding starts. Figure 1 is a cross-sectional view showing the main part, and Figure 2 is a partially enlarged front view showing the main part. In FIG. 1, a hooking hole 3 and a hooking rib 4 are provided in the winding trunk 2 of the spool 1, and the wire A is bent and hooked to this portion.

In addition, in FIG.
or a slit), and the wire A is bent and latched to this part.

However, with this method, the starting end of wire A is completely fixed to the spool, so when replacing the spool, it is necessary to forcibly remove the starting end with pliers, etc.
Moreover, if the wire is welded to the next wire tip with the latching curvature still attached, the wire may come off the feed roll at this portion, or there may be a failure in energization at the contact tip portion.

As a method for preventing these drawbacks, a method is also known in which a flexible tube 6 is fixed to the flange portion 5 as shown in FIG. 3, and the tip of the wire A is inserted and fixed into the tip of the flexible tube 6.

However, even with this method, wire A does not always come off easily when replacing the spool, and since the tip of wire A has a small diameter, feeding errors may occur during the feeding process after welding. This causes problems such as electrical current failure in the chip and unstable arc.

The inventors of the present invention focused on the above-mentioned circumstances, and realized that it is possible to securely fix the wire at the beginning end of the wire without attaching a latching groove, etc., and when it is time to replace the spool (just before the wire is finished) We have been conducting research to develop a latching method that allows the starting end to naturally separate from the latching part.

As a result, we learned that the above objective could be achieved by adopting the method shown below, and filed a separate patent application based on this knowledge.

That is, the invention of this application focuses on the fact that the welding wire has considerable rigidity, and the long hole provided in the winding body of the spool is
The wire is hung using its rigidity.

That is, as shown in FIG.
When the wire A is inserted into this and wound around the winding drum 2, when the cast diameter of the wire A is larger than the outer diameter of the winding drum 2, the wire A is inserted into the corner portions al of both ends of the elongated hole 7. j
a2 and is elastically deformed (the state shown by the chain line in Fig. 4)
, Fil, wire A due to contact friction at 22 points
This prevents the material from coming off in the direction of arrow B.

Therefore, by applying a sufficient frictional force that exceeds the pulling force, wire A can be completely prevented from coming off.

In order to increase the frictional force, the diameter (d) of the wire A is increased, the length of the elongated hole 7 is shortened, and the spool winding drum 2 is
What is necessary is to increase the wall thickness (1) of the wire A and further increase the pressure contact force of the wire A with respect to Al and the 32 points.

However, if the pressure welding force etc. becomes too large, the wire A will be plastically deformed and will become latched, resulting in poor feeding and poor energization during feeding after welding, as explained in FIGS. 1 and 2.

On the other hand, if the pressure repelling force is too small, the wire winding start end will come off the long hole during welding work, causing "unraveling".

Therefore, it is necessary to determine the length 4) of the elongated hole T, the wall thickness (1) of the spool winding drum 2, etc., so as not to impede the feeding performance of the wire and to prevent the wire from coming loose.

Based on this idea, we conducted research on the conditions for latching the end of the wire winding.

The following will be explained along with FIG. 5 (explanatory cross-sectional view of the main part at the starting end).

However, in the following explanation, the following conditions (1) and (3) are assumed.

■ Wire A is hung in a straight line in the long hole 7 (because the distance between the fulcrums 31132 is short, when the cast diameter of the wire is larger than the spool winding drum diameter, the wire is twisted between the fulcrums a1 and 2). is almost linear, and even when the cast diameter is equal to the spool barrel diameter).

■ The wire undergoes slight plastic deformation in the latched state (t
When t is short, the wire is plastically deformed, and as t becomes longer, the amount of plastic deformation decreases and becomes elastically deformed).

From FIG. 5, the angle θ formed by the hanging portion (contact point al-22) of the wire A with the center line of the winding drum can be determined by [Equation 11].

However, r: inner radius of the winding drum (key), d: wire diameter (wnφ), wall thickness on the second winding side (height), ψ: center angle corresponding to the circumference length of the long hole). The CID equation is derived.

Furthermore, in order to hang the wire in the elongated hole portion, it is sufficient to find the maximum angle (Maxφ) that satisfies 4-4=o, and by differentiating the CID formula with respect to φ and rearranging it, the formula [■] is derived.

By substituting this Maxf into the above-mentioned [ID and calculating the maximum angle (Maxθ) required for the correction, the formula [V] is established.

Further, when the length of the slotted hole required for hanging 4) is calculated using the above formula [IV], it is as shown in the formula [■].

On the other hand, the degree of bending at the starting end that does not impede wire feeding performance (
The amount of plastic deformation) is determined by the inner diameter (r) of the winding drum, the wall thickness (1), the wire diameter (varies depending on the wire, etc., but as a result of various experiments, the bending is less than a certain ratio to the diameter of the winding drum of the spool. However, it was found that the wire feedability was not affected.

That is, in order to confirm the relationship between the degree of bending at the starting end and feeding performance, a continuous 1.5-wheel cast with a certain bend at the starting end was pressed as shown in Figure 6, and the deformed part was placed on the front wheel. The effect of the distance 0 between the starting end of the wire and the front wheel on the wire feeding performance was investigated.

As a result, if the distance from the base of the deformed part (the final contact point when the deformed part is aligned with the front wheel) to the winding start end is 1), and the distance 0 is less than It was confirmed that there was no inhibition.

The length of the wire at the beginning of winding depends on the diameter of the spool's winding body; when the spool diameter is small, the insertion length is short; when the spool diameter is small, the insertion length can be lengthened. The spool's winding drum is provided with reinforcing ribs, and although the position of the ribs changes depending on the spool's winding drum diameter, they are generally provided at equal intervals.
It is almost 1.89.

Therefore, in order to check the degree of bending of the wire, which is a problem in feeding for spools with different diameters, it is necessary to press the button at each position of the wire insertion length and take many measurements. Since the wire latching angle is constant, it is only necessary to check the degree of bending at one point of the wire insertion length when the wire is in a free state. The relationship between the distance from the starting end and the distance of 0 was investigated.

The results are as shown in Figure 11A and B, and even for wire casting and spools with different diameters, the measured distance from the deformed part is , and the distance H is below. It has been found that there is no problem in feeding as long as the speed is within the range of .

Therefore, based on this experimental value, the minimum allowable length of the long hole (Mint) is determined as follows.

This will be explained below with reference to FIG.

As mentioned above, in order to suppress the amount of plastic deformation that occurs in the latching portion to an extent that does not impede the feeding performance, the H value that causes the deformation should be set to be below, and from Fig. 7, (r +
t d H)2=L"+b+t)22Lb+t)cO
Since it is 8θ, the minimum length of the elongated hole can be found when the following equation is established by substituting into this equation.

Transforming this formula, we get When this formula is further transformed and rearranged, [■] is established.

This angle θ is the same as the angle θ of the wire hook shown in FIG.

Also, from formula 11, it becomes.

Therefore, the angle φ (radian) between the circumferential length of the slotted hole 4) and the center of the winding drum is as follows. Substituting this into the formula [■] and sorting it out, we can find that the minimum circumference of the slotted hole that does not impede feeding performance. The length Mind) is calculated.

In other words, from formula [VI) and formula [■], in order to securely latch the wire without impeding its feeding performance, the circumferential length of the long hole 4) must satisfy the following formula [). The inner diameter (r) and wall thickness (1) of the winding drum should be set, and θ is the above [
(2) When the formula is satisfied, the circumferential length 4) becomes the minimum.

In this case, if the invention is filed separately, the inner diameter (r) of the winding drum
By setting the circumferential length 4) of the elongated hole within an appropriate range according to the wall thickness (1), a high latching effect can be obtained without impeding feedability.

Moreover, when the number of remaining loops of the welding wire decreases during use, the wire A springs back and separates from the winding drum, and the pressure applied to the contact points a11 and a2 decreases accordingly. It comes out naturally.

In parallel with the research on the means for latching the starting end of the wire as described above, the inventors of the present invention have been conducting research to further enhance the latching effect by devising the shape of the long hole itself.

The present invention relates to a spool for welding wire completed as a result of such research, in which a hole for inserting and locking the end of the wire winding is formed in the hollow body of the spool, and the wire hole is used to prevent the winding of the wire. A long hole is formed along the direction, and a V groove is formed at both ends of the long hole in contact with the wire,
The gist lies in the provision of slits in the valleys of the V-grooves.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure and effects of the present invention will be explained below based on drawings which are examples.

FIG. 8 is a sketch of the main parts illustrating the spool of the present invention, and shows an enlarged view of the elongated hole portion in which the starting end of the welding wire is hooked.

That is, in the present invention, a long hole 7 is formed in the winding drum 2 of the spool along the winding direction of the wire, and the starting end of the wire is inserted and locked in accordance with the structure of the invention. At least the contact portion al with the wire at both ends.

A V-groove is formed in a2, and a notch 9 is provided in the valley portion 8 of the V-groove along the winding direction of the wire.

If the wire A is oriented in this manner, the wire A is pressed against the vicinity of the valley part 8 of the V-groove and latched thereon, as shown in FIG. Due to the wedge effect of A, the notch 9 is slightly expanded to the left and right and becomes in a state where it seems to be holding the wire A, thereby further enhancing the latching effect of the wire A.

Moreover, the remaining loop of wire A is reduced and the contact point a1
, when the pressure contact force against a2 decreases, the notch 9 closes,
The wire A receives a force in a direction that pushes it out from the trough 8.

Therefore, the removal of the starting end at the final stage becomes extremely smooth.

Reference numeral 10 in the figure is a round hole for preventing the tip of the notch 9 from breaking due to the notch effect.

FIG. 10 is a sketch of the main parts showing another embodiment of the present invention.
V-grooves and notches 9 are provided only at the corner portions of the elongated hole 7 where the wires A are pressed against each other, and the effect of these is substantially the same as that described in FIG. 8.

Note that the shape of the V-groove, the depth of cut of the slit 9, etc. are not limited to the illustrated example, and may vary depending on the diameter of the welding wire A to be wound,
It can be arbitrarily changed depending on the material and thickness of the winding drum, the dimensions of the elongated hole 7, etc.

Also, as shown in Figure 12, the diameter of the spool winding drum is (4).
If the outer diameter of the spool is O, then if you press the button so that the cast diameter of the first few wheels at the beginning of wire winding is less than 10-(L-t), the end of the wire winding will be adjusted by back tension etc. This is preferable because there is no fear that the wire will jump out of the spool even if it comes out of the latching hole.
The clamping force of the grooves and slits enhances the latching effect,
At the end of feeding, the wire is pushed out of the V-groove by the restoring force of the slit, thereby facilitating the removal of the wire, thereby simultaneously enhancing the two conflicting functions required of the elongated hole.

Although the present invention was developed as an improvement technology of the invention described above, due to the unique effects of the present invention described above,
It exhibits an excellent effect even when it is out of the specified range of the invention.

[Brief explanation of the drawing]

Figures 1 to 3 are cross-sectional views of main parts showing a conventional method of locking the winding start end of a spool-wound wire, and Figures 4 and 5-7 are explanatory views showing a wire locking mechanism applied in the present invention. , Fig. 6 is an explanatory diagram showing a method for measuring the amount of plastic deformation at the hooking part of the wire, Figs. 8 to 10 are schematic diagrams of main parts showing the elongated hole part of the spool according to the present invention, and Fig. 11 is a diagram showing the wire deformation part. FIG. 12 is a graph showing the relationship between the distance from the wire and the wire separation height, and is a diagram for explaining the preferable cast diameter of the wire winding start end. 1... Spool, 2... Winding barrel, 3...
...Latching part, A...Welding wire, 7...
... Long hole, 8 ... Valley of V groove, 9 ...
··slit.

Claims (1)

[Scope of utility model registration request] In a spool for winding a welding wire consisting of a hollow winding trunk and a flange, a hole for inserting the wire and a winding start end is formed in the hollow winding trunk, and the hole is used for winding the wire. A spool for welding wire, characterized in that the attachment is an elongated hole along the direction, and a V groove is formed at both ends of the elongated hole in contact with the wire, and a slit is provided in the valley of the V groove. .