JPH04224019A - Method for repairing deformation of steel plate - Google Patents

Abstract

PURPOSE:To offer a method for easily and flatly repairing a projecting deformed part generated on a metal plated steel plate as leaving the plated part. CONSTITUTION:As the tip part of a metallic bar body 11 heated nearly to the melting temperatures of the metal plated part (c) and the steel plate W is brought into contact with the deformed part (d), the deformed part (d) is traced, then, the deformed part (d) is rubbed by oil stone.

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 convex deformations that occur in a metal-plated steel plate.

0002

[Prior Art] For example, steel plates used for automobile bodies etc. are usually plated with metal such as zinc plating of several microns in order to prevent rust. Pressed using a mold.

[0003] During the press processing, if minute dust or the like is attached to the mold, it may cause, for example, a concave deformation on the inner surface of the steel plate and a convex deformation on the outer surface of the steel plate. In such cases, it is necessary to repair the deformed part, especially since the convex deformation that occurs on the outer surface of the steel plate may impair the appearance even after painting. arise.

[0004] In this case, conventionally, as a method for repairing such a convex deformed part, an operator grinds the deformed part with sandpaper and performs a so-called buffing process. It is known that the surface is repaired to smooth the surface.

However, in this repair method, the plating for preventing rust is also ground, so it is difficult to repair the deformed part while leaving the plating intact, and the repair work requires a high degree of skill. Furthermore, even if the repair work is carried out by a skilled person, there is a problem in that the plating is often removed.

[0006]

[Problems to be Solved by the Invention] The present invention solves such inconveniences and eliminates the convex deformed portions that occur on the surface of the steel plate.
To provide a method that can easily and smoothly repair the surface while leaving the metal plating applied to the surface.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a method for repairing a convex deformed portion that occurs on the smooth surface of a metal-plated steel plate, the method comprising: A step of tracing the deformed part with the metal rod while bringing the tip of a metal rod heated to about the melting temperature of the steel plate into contact with the deformed part, and then smoothing the deformed part with an oil stone. It is characterized by consisting of a step of rubbing in order to

Furthermore, when tracing the deformed portion with the metal rod, the tip of the metal rod traces a substantially spiral trajectory from the center of the deformed portion toward the peripheral edge. It is characterized by tracing the deformed part.

[0009]

[Operation] According to the present invention, first, the tip of the metal rod heated to about the melting temperature of the plating and steel plate is brought into contact with the deformed part, and the deformed part is moved by the metal rod. By tracing the deformed part, the plating and the steel plate are softened or melted and roughly smoothed so that the amount of protrusion is reduced. After that, by rubbing the deformed part with the oil stone, the plating is smoothed. The deformed portion is almost smoothed without being ground.

[0010] In this case, when tracing the deformed part with the metal rod, the tip of the metal rod traces a substantially spiral trajectory from the center of the deformed part to the peripheral edge. By tracing the deformed part, the deformed part is gradually smoothed from the central part, which is the maximum protruding part, toward the peripheral part, and uniform smoothing is possible.

[0011]

[Embodiment] An example of the deformation repair method of a steel plate according to the present invention will be explained with reference to FIGS. 1 to 6. FIG. 1 is an explanatory diagram 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 deform repair device.

In FIG. 1, this deformation repair device includes a conductive table 2 supported on a plurality of legs 1 and an electric pen device 3, and the conductive table 2 has its upper surface pressed. The steel plate W can be placed in an electrically connected state.

[0013] Inside the main body case 4 of the electric pen device 3, there is housed a large current energizing circuit section 6, etc., which is connected to a commercial power source via a power cord 5 led out from inside.

In this case, the large current carrying circuit section 6 is grounded to the conductive table 2 from the grounding terminal 7 provided on the main body case 4 via the ground wire 8, and is connected to the conductive table 2 from the output terminal 9 provided on the main body case 4. It is connected via a connection cord 10 to an electric pen 11 which is a metal rod. The electric pen 11 can be gripped via a grip part 12 made of an insulating material and fixed to the rear end thereof.

The main body case 4 also includes a power switch 1.
3, an output voltage adjustment knob 14, etc. are attached.

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

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

Next, using the deformation 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. 1 and FIGS. 2 to 5.

In FIG. 1, the deformed portion d(
2), the steel plate W is placed on the conductive table 2 with its inner plate surface b facing downward, 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 is set to, for example, 3V using the output voltage adjustment knob 14.

Next, 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 deformation repair device causes a large current (for example, 100 A) to flow from the large current energizing circuit section 6 to the conductive table 2 through the electric pen 11 and the steel plate W, thereby causing the electric pen 11 to The contact point between and the steel plate W,
That is, the deformed portion d of the steel plate W is electrically heated to about the melting temperature (500 to 600° C.) of the steel plate W and the galvanizing c.

[0022] In this state, next, the deformed part d is traced over almost the entire surface thereof using the electric pen 11. In this case, the way of tracing is to trace the deformed part d so that the tip of the electric pen 11 draws a substantially spiral trajectory X from the center of the deformed part d toward the periphery, as shown in FIG. .

At this time, the deformed part d gradually melts or softens from its center to its periphery and flows toward its hem, as shown in FIG. d is approximately smoothed. in this case,
Since the zinc plating c flows above the main body portion of the steel sheet W, it will not be removed from the deformed portion d.

In this case, in this embodiment, as shown in Table 1 below, the deformed part d is heated by applying a current of 100 A to the deformed part d, and the deformed part d is
The heating time was changed depending on the height of the object, and the larger the height, the longer the heating time.

[0025]

[Table 1]

After this, the surface of the deformed part d is rubbed with an oil stone Y shown by the imaginary line in FIG. Smooth the part d. In this smoothed state, the thickness of the zinc plating c on the deformed portion d becomes somewhat smaller, but remains at a thickness of about 2 microns, for example.

[0027] According to this repair method, the deformed part d can be easily smoothed by simply tracing the deformed part d with the electric pen 11 and then rubbing the deformed part d with the oil stone Y. can be converted into

In this case, when tracing the deformed part d with the electric pen 11, the deformed part d is traced so as to draw a substantially spiral trajectory X from the center toward the periphery. The deformed portion d is gradually heated from the center toward the peripheral edge and flows toward the hem, so that the deformed portion d is uniformly smoothed.

[0029]

Effects of the Invention As is clear from the above description, according to the present invention, when repairing a convex deformed part that occurs in a metal-plated steel plate, first, the melting temperature of the plating and the steel plate is The deformed part is roughly smoothed by tracing the deformed part with the metal rod while bringing the tip of the metal rod heated to a certain degree into contact with the deformed part, and then,
By rubbing the deformed part with an oil stone to further smooth it, the deformed part can be repaired easily and smoothly while leaving the plating on its surface.

[0030] In this case, when tracing the deformed part with the metal rod, the tip of the metal rod traces a substantially spiral trajectory from the center to the peripheral edge of the deformed part. This allows the deformed portion to be uniformly smoothed.

[Brief explanation of the drawing]

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

[Figure 2
] Process explanatory diagram for explaining the deformation repair method using the repair device

[Fig. 3] Process explanatory diagram for explaining the deformation repair method using the repair device

[Fig. 4] Process explanatory diagram for explaining the deformation repair method using the repair device

[Fig. 5] Process explanatory diagram for explaining the deformation repair method using the repair 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 that occurs on the smooth surface of a metal-plated steel plate, the tip of a metal rod being heated to about the melting temperature of the plating and the steel plate. A deformed part of a steel plate comprising a step of tracing the deformed part with the metal rod while bringing the deformed part into contact with the deformed part, and a step of rubbing the deformed part with an oil stone to smooth it. Foam repair method. 2. When tracing the deformed part with the metal rod, the tip of the metal rod traces a substantially spiral trajectory from the center of the deformed part to the peripheral edge of the deformed part. 2. The method for repairing deformed steel plates according to claim 1, wherein the deformed portion is traced.