JPS58137505A - Drilling method and drilling tool of elastic hollow rod body - Google Patents

Abstract

PURPOSE:To correctly drill a small hole in required dimensions without a residual drilling chip to an expected part in which the small hole is drilled. CONSTITUTION:A drilling tool 1 is such that a true circular shaped cylindrical edge 2a is integrally formed to the point end of a cylindrical base part 2 and a metallic piercing needle 4 is provided to a rear part 3a of the edge 2a. The needle 4 is slightly protrusively provided from the point of the edge 2a. The part 2 is rotated by positioning in such a manner as to pierce a needle point 4a to the center of an expected part 5a of drilling a small hole 6 in an elastic hollow rod body 5. The tool 1 is pressed to the body 5 to drill the hole 6 by the edge 2a, and a drilling chip 5c is held to the needle 4 and removed.

Description

[Detailed Description of the Invention] Jin's invention relates to a drilling method and a drilling tool for an elastic hollow strip that accurately drills a small hole of a required size without leaving any drilling debris in the elastic hollow strip. be.

Figure 4 shows a conventional elastic hollow strip drilling tool.
5.6 shows the state when a small hole η is drilled in the elastic hollow strip 4 by the drilling tool Pl which is rotated at high speed.
According to this drilling tool P.

This is caused by the elastic deformation that occurs in the strip during drilling.

The drilled small hole ρ deviates greatly from the planned hole, the shape of the hole is irregular, and around the small hole 4, the hole ρ is turned upside down with a portion left uncut on the fin. Drilling scum 2
2& remains through the uncut small piece 22b. All of the small holes η drilled in the 0-strip body have such defects, which degrade the appearance and quality of the 1-strip body. Perforation＾Pg, P
Although there are some differences in a and P-, they have the same drawbacks as above and are extremely unsuitable as punching tools for elastic hollow strips.

This ga@ was taken in consideration of the above-mentioned actual situation,
The purpose is to provide a method for drilling an elastic hollow strip body and a method for drilling a small hole of a required size without leaving any drilling debris in the area where the small hole is planned to be drilled. It is in.

The gist of this invention is to integrally form a cylindrical blade whose center line coincides with the center line of the base at the tip of an elongated cylindrical base, and to insert a piercing needle into the deep part of the space wall inside the skeleton cylindrical blade. The holes must be implanted with the needle tip aligned with the center line of the cylindrical blade and slightly protruding from the cylindrical blade light, and the holes should not be left behind in the area where the small hole of the elastic hollow strip is planned to be drilled using the same. This is a method of drilling a small hole of the correct size.

Embodiments of the present invention will be described in detail below with reference to the first to eighth drawings. Fig. 1 is a side view of a part of the perforation according to the present invention, and Fig. 2 shows the state immediately before the small hole is drilled. I will show you later.

In the figure, l is the punching tool of the present invention, 2 is the base, 2a is the cylindrical blade,
8 is a space wall, 4 is a piercing needle, 6 is an elastic hollow strip, and 6 is a small hole.

The drilling tool l of this invention has a long metal cylindrical base 1ul.
l! 85111. At the tip of the length (approximately 3 cm), its center line t,
A perfectly circular (M diameter 8 mm) cylindrical blade 2a whose s coincides with the center line of the base 2 is integrally formed. l A heat-resistant and wear-resistant metal piercing needle 4 is placed in the inner part 8a of the cavity wall 8 inside the cylindrical blade 2a, and the needle tip 4a is aligned with the center line L1 of the cylindrical blade 2a.
It is planted so as to protrude slightly (approximately 21111 mm) from the tip of the short blade 2a. For planting, attach the base of needle 4 to heat resistant 9
It is fixed with strong adhesive 7.

In order to use this drilling tool 1 to drill a small hole 6 in a portion 6a of the elastic hollow strip 5 where a small hole is to be formed, as shown in FIG. 1I,
At the center δb of the portion 6m (within the dashed line), its base! 11, then pierce the needle tip 41 of the punching tool 1, which has been turned forward and backward, to position it as shown in the figure, press the punching tool 1 against the strip 6 as shown in Fig. Cut out the area around the center 6b, and as shown in Figure 0, stick the drilling slag 6C into the needle tip 4a to make a small hole ([diameter 11 m) @&
Make a hole and remove the punch l from the strip as shown in Figures D and E 8
In addition, a small hole 6 of the required size (8 holes in diameter) is accurately drilled in the part where the small hole is planned to be drilled in the single strip body 5 so that no drilling debris 66 remains. 5m is slightly elastically deformed, but this portion 5m is supported by the needle tip 4a and does not escape or deform any further. In this shape part 6
Since m is cut out from the strip 6, the perforation scrap - is
No residue will remain around the drilled small hole 6.

Then, the drilling position and hole shape of the small hole 6 are exactly the same as the one dimension.
lK perforated. During drilling, the lower part of the single strip body 5 is temporarily fixed.

As described above, according to C's invention ζ, all the problems of the conventional method such as the shape of the small hole and the drilling debris can be solved, and the effect of improving the quality of the elastic hollow strip is tremendous. It is.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the box with the hole drilled, Figure 12 is a view of the opening before drilling the small hole 1, Figures M to E show the procedure for drilling the small hole in order, Figure 4 Figure I: Conventional drilling tool, No. 6.
FIG. 6 is an explanatory diagram of the conventional drilling method. l...Punching tool 2 &...Cylinder blade 4...Piercing needle 5
...Elastic hollow strip 6...Small hole

Claims (1)

[Claims] l. A double-edged blade whose center line coincides with the center line of the base is integrally formed at the tip of the elongated cylindrical base. A piercing tool is installed in the inner space m* of the scissor tube blade with the piercing needle aligned with the center line of both blades and the needle tip slightly protruding from the tube blade light. By applying high-speed rotation and excessive pressing force, the needle tip is thrust into the center of the part where the small hole is to be drilled in the first elastic hollow strip to position it, and the cylindrical blade is used to shape the periphery of the center into a circular shape. 6. A method for drilling an elastic hollow strip, comprising: cutting out and drilling a hole, and accurately drilling a small hole of a required size without leaving any drilling debris in a portion of the strip where the small hole is to be drilled. L - A cylindrical blade whose center line coincides with the center line of the base is integrally formed at the tip of the long cylindrical base. Perforation of an elastic hollow strip characterized by implanting four protruding needles in the inner space** of the scissor tube blade in the inner part with the needles aligned with the center line of the tube blade and with the needle tips slightly protruding from the tube blade light. Ingredients.