JP3060870U - Spot peeling Holso - Google Patents

Abstract

(57) [Summary] [Problem] The present invention relates to the peeling of a spot welded portion. The welded portion is securely positioned, the core starts to be pierced without swinging, the upper sheet metal and the lower sheet metal are peeled, and the lower sheet metal part is convex. Separating the upper and lower sheet metal in a flat state without leaving any parts or recesses,
It is characterized in that processing after separation is omitted. Furthermore, in order to cope with the hardening of the spot weld, a hard metal is used as the material of the cutting blade.

Description

[Detailed description of the invention]

[0001] The present invention relates to a blade for peeling off a sheet metal of a spot welding portion, and reliably removes a welding portion without shifting a fixed position by a freehand operation of an operator. A hole with the smallest diameter is drilled in the upper sheet metal of the stacked sheet metal, and the lower sheet metal is peeled off in a flat state without leaving the concave shape of the center on the lower sheet metal without leaving the convex shape of the debris of the upper sheet metal. The cut is related to the hole saw.

[Prior art] Conventionally, there has been a method of peeling off the overlapped sheet metal at the spot welding portion by peeling off the overlapping portion by making a ring-shaped groove with an annular drilling tool having a dimension larger than the spot welding area. In the groove-shaped cutting, a pin is free on the lower sheet metal part, so a convex welded part remains and must be removed later. In another method, the method of sharpening the drill is changed (as opposed to the hole saw type where the protruding portion remains), and in the drilling method where the welded part is entirely removed, the protruding part of the drill enters the lower sheet metal part. The remaining concave holes had to be filled and flattened.

[Problem to be Solved by the Invention] An object of the present invention is to provide a spot peeling hole saw capable of removing a spot welded portion of the above-mentioned laminated plate in a nearly flat state without leaving a convex portion or a concave portion on a lower sheet metal.

[Means for Solving the Problems] In order to achieve the above object, the present invention locates the cutting blade close to the center of the hole saw, and only uses the cutting blade at the tip to position the center and maintain the centering property. It is equipped with a center pin that also serves as a spot welding part, and the lower sheet metal can be peeled off in a flat shape without any concave or convex parts.

[0005] [Embodiment of the present invention] In the present invention, the center of the center is positioned by the pin pressure of the spring, and the cutting edge positioned close to the center does not leave a protrusion at the center part. The spot welding part is to be peeled off using the pin as a pin.

Embodiment Hereinafter, a spot peeling hole saw of the present invention will be described in detail based on an embodiment. FIG. 1 is a perspective view showing a spot peeling hole saw of the present invention. FIG. 2 is a cross-sectional view. Referring to FIGS. 1 and 2, the spot peeling hole saw 1 has a cylindrical main body 2 and a center pin 3, a small blade 4 and a large blade 5, and a spring 6. It is formed by a spring pressure adjusting screw 7.

FIG. 3 shows a hole saw and a drill used for a conventional spot peeling. In any case, the lower sheet metal needs to be processed after the protrusions or recesses remain.

Next, the spot peeling hole saw of the present invention will be described with reference to FIG. (A) In the figure, the upper sheet metal 8 and the lower sheet metal 9 are connected by a spot welding portion 10, but when the body 2 is lowered while rotating to remove it, the center pin 3 comes into contact with the upper sheet metal 8 and the spring 6 Due to the pressure, the notch V shape of the center pin 3 makes a fine scratch hole in the upper sheet metal 8 to secure positioning and centripetality. As the descent proceeds further, the small blade 4 and the large blade 5 cut the upper sheet metal 8 as shown in FIG. The center pin 3 rotates at the same time and pushes up the spring 6 to pull in along the pin groove with the large blade as a key.

The time when the small blade 4 and the large blade 5 reach the lower sheet metal 9 is shown in FIG. The difference in the cutting edge between the small blade 4 and the large blade 5 is indicated by a slug 12, which is crushed at the tip of the center pin 3 because of the minute convex shape. (D) Drilling ends as shown in the figure. The hole saw 1 is pulled up to separate the upper sheet metal 8 and the lower sheet metal 9. The slag 12 remaining in the center at that time is pressed and deformed to 12 ", and has almost no shape, so that there is no influence on post-processing.

[Effects of the Invention] As can be understood from the above description of the embodiment, the present invention has the structure described in the claims, and therefore, the lower sheet metal is used for the stripping work in the overlapped portion of spot welding. The upper and lower sheet metals can be peeled off while having a flat shape with no protrusions or recesses left. The cutting blade joins the cemented carbide metal blade corresponding to the hardened weld.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a spot peeling hole saw of the present invention.

FIG. 2 is a sectional view of the spot peeling hole saw of the present invention.

FIG. 3 is an example of a conventional spot peeling hole saw and a spot peeling drill.

FIG. 4 shows a drilling procedure using a spot peeling hole saw according to the present invention.

[Explanation of symbols]

 1, spot peeling hole saw 2, blade body 3, center pin 4, small blade 5, large blade 6, spring 7, spring pressure adjusting screw

Claims (2)

[Utility model registration claims] The present invention relates to an operation for peeling a spot welded portion of an overlapped sheet metal, in which a plurality of grooves are separately provided on an outer peripheral surface of a side wall portion of a cylindrical tool body, and one of the cutting blades at the lower end of the groove has a cylindrical shape. Spot peeling hole saw characterized by a combination of cutting blades having a width equivalent to the thickness and the other having a width closer to the center than the outside of the cylinder 2. A center portion of said cylindrical cutting blade has a notch-shaped pin which moves up and down by a spring using a wide blade as a key guide. Spot peeling hole saw characterized by engaging and rotating at the same time during driving