JPH07106386B2 - Steel plate deforming repair method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a convex deform formed on a metal-plated steel sheet.

[0002]

2. Description of the Related Art For example, a steel plate used for an automobile body or the like is usually plated with a metal such as zinc plating of about several microns to prevent rust, and the plated steel plate is It is pressed by a mold.

During the press working, if minute dust or the like adheres to the die, for example, a concave deform may be formed on the inner plate surface of the steel plate and a convex deform may be formed on the outer plate surface. In such a case, in particular, the convex deformed on the outer surface of the steel plate may damage the appearance even after the coating, so it is necessary to repair the deformed portion. Occurs.

In this case, as a method of repairing such a convex deformed portion, conventionally, an operator grinds the deformed portion with sandpaper and performs a so-called buffing process, whereby the deformed portion is It is known that repairs are performed to smooth the surface.

However, in this repair method, the plating for rust prevention is also ground, so it is difficult to repair the deformed portion while leaving the plating, and a high degree of skill is required for the repair work. Further, even if the repair work is performed by a skilled person, the plating is often removed, which is a disadvantage.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned inconvenience, and a convex deformed portion formed on the surface of a steel sheet is
It is an object of the present invention to provide a method capable of easily and smoothly repairing a metal plating applied on the surface of the surface.

[0007]

In order to achieve such an object, the present invention is a method for repairing a convex deformed portion formed on a smooth surface of a metal-plated steel sheet, which comprises: A step of tracing the deformed portion with the metal rod while abutting the tip of the metal rod heated to the melting temperature of the steel plate to the deformed portion, and then smoothing the deformed portion with oil stone. And a step of rubbing in order to change the shape.

Furthermore, when tracing the deformed portion with the metal rod, the tip of the metal rod draws a substantially spiral locus from the center of the deformed portion toward the peripheral portion. It is characterized in that the deformed portion is traced.

[0009]

According to the present invention, first, the deformed portion is made to contact the deformed portion while the tip portion of the metal rod heated to about the melting temperature of the plating and the steel sheet is brought into contact with the deformed portion. By tracing, the plating of the deformed portion and the steel sheet are roughly smoothed so that the protruding amount thereof becomes small while softening or melting, and thereafter, the plating is performed by rubbing the deformed portion with the oil stone. The deformed portion is almost smoothed with almost no grinding.

In this case, when the deformed portion is traced by the metal rod, the tip of the metal rod draws a substantially spiral locus from the center of the deformed portion toward the peripheral edge. By tracing the deformed portion, the deformed portion is gradually smoothed from the central portion, which is the maximum protruding portion, toward the peripheral portion, and uniform smoothing is possible.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of a steel plate deforming repair method of the present invention will be described with reference to FIGS. FIG. 1 is an explanatory view for explaining the configuration of a deform repair device, and FIGS. 2 to 5 are process explanatory diagrams for explaining a deform repair method using the repair device.

In FIG. 1, this deforming repair device comprises a conductive table 2 supported on a plurality of legs 1 and an electric pen device 3. The conductive table 2 is press-worked on its upper surface. The steel plate W thus formed can be placed in an electrically connected state.

Inside the main body case 4 of the electric pen device 3, there is housed a large-current energizing circuit portion 6 and the like connected to a commercial power source via a power cord 5 led out from the inside.

In this case, the high-current conducting circuit section 6 is grounded from the grounding terminal 7 provided on the body case 4 to the conductive table 2 through the grounding wire 8, while the output terminal 9 provided on the body case 4 is provided. It is connected to an electric pen 11 which is a metal rod through a connection cord 10. The electric pen 11 can be held by a holding portion 12 made of an insulating material and fixed to the rear end of the electric pen 11.

The body case 4 has a power switch 1
3 and the output voltage adjusting knob 14 and the like are attached.

On the other hand, the steel plate W is, as shown in FIG.
The outer plate surface a and the inner plate surface b are galvanized c, for example, and are pressed into a predetermined shape. Then, in this case, a convex deformed portion d and a concave deformed portion e are respectively formed on the outer plate surface a and the inner plate surface b of the steel plate W during the press working.

In this embodiment, the steel plate W has a thickness of 0.7 to 0.8 mm, for example, and the zinc plating c applied to the steel plate W has a thickness of 4 microns, for example.

Next, using the deform repair device,
A method for repairing the convex deformed portion d on the outer plate surface a of the steel plate W will be described with reference to FIG.

In FIG. 1, the deformed portion d of the steel plate W
When repairing (shown in FIG. 2), the steel plate W is placed on the conductive table 2 with the inner plate surface b thereof facing down, while the power cord 5 of the electric pen device 3 is connected to a commercial power source. At the same time, the power switch 13 is turned on, and the output voltage adjusting knob 14 sets the output voltage to, for example, 3V.

Then, as shown in FIG. 2, the tip of the electric pen 11 is brought into contact with the deformed portion d of the steel plate W.

At this time, the deform repairing device causes a large current (for example, 100 A) to flow from the large-current conducting circuit section 6 to the conductive table 2 through the electric pen 11 and the steel plate W, whereby the electric pen 11 is supplied. Of the steel sheet W, that is, the deformed portion d of the steel sheet W is electrically heated to about the melting temperature (500 to 600 ° C.) of the steel sheet W and the zinc plating c.

Then, in such a state, next, the deformed portion d is traced by the electric pen 11 over substantially the entire surface thereof. In this case, the tracing is performed by tracing the deformed portion d so that the tip of the electric pen 11 draws a substantially spiral locus X from the center portion of the deformed portion d toward the peripheral portion as shown in FIG. .

At this time, the deformed portion d gradually melts or softens from the central portion to the peripheral portion and flows toward the skirt side thereof, whereby the deformed portion d is formed as shown in FIG. d is approximately smoothed. in this case,
Since the zinc plating c flows on the upper side of the main body of the steel plate W, it is not removed from the deformed portion d.

In this case, in this embodiment, as shown in Table 1 below, the current applied to the deformed portion d was set to 100 A to heat the deformed portion d, and the deformed portion d was also heated.
The heating time was changed according to the height of the, and the heating time was longer as the height was higher.

[0025]

[Table 1]

After that, the surface of the deformed portion d is rubbed by the oil stone Y shown in phantom in FIG. 4, whereby the trace of the electric pen 11 is removed and the deformed portion is deformed as shown in FIG. The part d is smoothed. Then, in this smoothed state, the thickness of the zinc plating c in the deformed portion d becomes slightly smaller, but remains in a thickness of, for example, about 2 microns.

As described above, according to the repair method, the deformed portion d can be easily smoothed by simply rubbing the deformed portion d with the electric pen 11 and then rubbing the deformed portion d with the oil stone Y. Can be converted.

In this case, when tracing the deformed portion d with the electric pen 11, by tracing the deformed portion d so as to draw a substantially spiral locus X from the center portion to the peripheral portion, The deformed portion d is gradually heated from the central portion thereof toward the peripheral portion and flows toward the skirt side, so that the deformed portion d is uniformly smoothed.

[0029]

As is apparent from the above description, according to the present invention, when repairing a convex deformed portion formed on a steel sheet plated with metal, first the melting temperature of the plating and the steel sheet is repaired. The deformed portion is roughly smoothed by tracing the deformed portion with the metal rod while abutting the tip of the heated metal rod to the deformed portion, and then,
Since the deformed portion is rubbed with oil stone to be further smoothed, the deformed portion can be easily and smoothly repaired while leaving the plating on the surface thereof.

In this case, when tracing the deformed portion with the metal rod, the tip of the metal rod is traced so as to draw a substantially spiral trajectory from the center of the deformed portion toward the peripheral portion. By this, the deformed portion can be uniformly smoothed.

[Brief description of drawings]

FIG. 1 is an explanatory diagram for explaining a configuration of a deform repair device in an example of the deform repair method of the present invention.

FIG. 2 is a process explanatory view for explaining a repair method for a deform using the repair device.

FIG. 3 is a process explanatory view for explaining a method for repairing a deform using the repair device.

FIG. 4 is a process explanatory view for explaining a repair method for a deform using the repair device.

FIG. 5 is a process explanatory view for explaining a deforming repairing method using the repairing device.

[Explanation of symbols]

 W Steel plate c Zinc plating (metal plating) d Convex deformed part 11 Electric pen (metal rod) Y Oil stone

Claims (2)

[Claims] 1. A method for repairing a convex deformed portion formed on a smooth surface of a steel sheet plated with metal, the tip portion of a metal rod body being heated to about the melting temperature of the plating and the steel sheet. A step of tracing the deformed portion with the metal rod while bringing the deformed portion into contact with the deformed portion, and thereafter rubbing the deformed portion with oil stone to smooth the deformed portion. Form repair method. 2. When tracing the deformed portion with the metal rod, the tip of the metal rod draws a substantially spiral locus from the center of the deformed portion toward the peripheral edge. The deforming repair method for a steel sheet according to claim 1, wherein the deforming portion is traced.