JPH08281346A - Working method for taper hole - Google Patents

Abstract

PURPOSE: To attain cost reduction for a punching working by remarkably reducing a man-hour required for punching a necessary taper hole. CONSTITUTION: This method is a working method by which a taper hole 4a is pierced on a metal plate 4 by using a punch 3. By forming a taper shape 3a at the tip of a punch, and by pressing this taper part 3a from the front surface of the metal plate until the tip 3b of the taper part 3a projects from the rear surface part 4b of the metal plate 4, the taper shape 3a is transferred on the metal plate 4. And also, a metal plate 4c projecting on the rear surface side 4b of the metal plate 4 is removed. Also, dummy metal plates can be laminated on the metal plate 4 and plural taper holes can be formed on the metal plate. Consequently, a taper hole can be easily pierced, moreover, various taper shapes can be obtained, also many pieces can be easily formed, and a very small hole can be easily pierced as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining method suitable for machining a tapered hole in a plate material, and particularly to machining a tapered hole suitable for drilling a minute hole on the thin diameter side of a thin plate material. It is about the method.

[0002]

2. Description of the Related Art Generally, it is well known that cutting or pressing is used to make a hole in a plate material.
However, in the case of punching a hole by pressing, it is more like punching rather than pressing it from above the plate material, and thus it was an unsuitable method for punching a tapered hole.

In addition to press working, etching can be considered as a working method for making a tapered hole particularly in a thin plate material. In this method, a resist having a hole corresponding to the size of the hole to be formed is coated on a plate material, and the plate material is immersed in an etching solution to form the hole. However, although the hole is tapered by this method, it is very difficult to control the taper angle, and it is difficult to secure a desired taper angle in mass production.

Another sure drilling method is the above-mentioned cutting method. This uses a weight for cutting with a tip that forms a required angle, rotates this weight to scrape the plate material and drill a required angle.The most commonly used tapered hole. It is the dawn processing method.

[0005]

However, the method of cutting using a weight has a drawback that a large amount of time and labor is required for drilling one piece, resulting in a large processing cost. are doing. Further, if a plurality of such taper holes are to be formed in a single plate material, a huge number of man-hours are required for positioning and processing time, which further increases the cost.

The present invention is intended to solve such a technical problem, and is to greatly reduce the number of man-hours required for drilling a required tapered hole.

[0007]

The present invention has the following technical means for achieving the above object. In other words, this is a processing method in which a punch hole is formed in a plate material by forming a taper hole at the tip of the punch. It is characterized in that the shape is transferred and the plate material protruding to the lower surface side of the plate material is removed.

Further, a dummy plate material is laminated on the above plate material, and the dummy plate material is removed after processing the tapered hole.

Further, when the plurality of taper portions are formed on the plate member, the punch is formed with a plurality of taper portions and is transferred.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a step of forming a tapered hole in a plate material, and FIG. 2 is a top view of the hole formed in the step of FIG. The taper drilling device will be described with reference to FIG. An upper die 1 has a slide hole 1a for holding a punch 3 described later. 2 is a lower mold and plate material 4
An escape hole 2a is formed in the protruding portion. A punch 3 has a conical portion 3a with an angle of 70 degrees at its tip. 4 is a plate material having a plate thickness of about 0.3 mm. At this time, in order to form a tapered shape over the entire plate thickness, the taper portion length of the punch 3 may be set to about 0.35 mm, which is slightly longer than the plate thickness. Therefore, the outer diameter of the weight is
0.35 x tan35 (degree) = 0.245, and the diameter is 0.245 x 2 = 0.49 mm, that is, 0.5 mm
It would be good if there were, and very small diameters are possible.

Next, the steps will be described step by step with reference to FIG. As in the step (A), the punch 3 is held in the slide hole 1a of the upper die 1. Then, the plate material 4, which is a workpiece, is sandwiched between the upper die 1 and the lower die 2. Generally, when the plate material 4 is supplied, the upper mold 1 and the lower mold 2 are separated from each other by a distance sufficient to supply the plate material 4.

Next, as in the step (B), the upper mold 1 and the lower mold 2
The plate material 4 is sandwiched by and the punch 3 is attached to the slide hole 1 of the upper die 1.
Slide down in a. Then, a constant force is further applied from the time of contact with the plate material 4, and the conical portion 3 of the punch 3 is
The tip 3b of “a” is gradually lowered while pressing the plate member 4. As a result, the tapered shape 4a is punched while transferring the shape of the conical portion 3a to the plate member 4. This is repeated until the tip 3b of the conical portion 3a protrudes downward from the lower end 4b of the plate member 4. At this time, the plate member 4 protrudes into the clearance hole 2a of the lower die 2 by the material pressed by the punch 3. The protruding portion 4c is formed.

After that, the upper die 1 including the punch 3 and the lower die 2 are separated from each other to form a plate member 4 as shown in FIG. Then, the protruding portion 4c is removed from the plate material 4 by using the cutter 5 in the direction of the arrow 6 to obtain the plate material 4 having the tapered hole 4a as shown in FIG.

FIG. 2 is a plan view of the plate member 4 shown in FIG. The taper hole 4a of the plate member 4 has a large diameter D and a small diameter d, but the taper hole according to the present embodiment is suitable for forming a very small diameter d, and the small diameter d = It is possible to form up to about 10 μm. Further, for manufacturing the one having a circular shape in a plane as shown in FIG. 2, a method of slowly rotating the punch 3 at the time of punching may be used.

A modification of the present invention will be described below.
3A and 3B are sectional views and FIG. 3B is a top view, in which the tapered hole shape has a square shape when viewed two-dimensionally. The taper forming portion 13a of the punch 13 is formed into a quadrangular pyramid. This punch 13 is used in place of the punch 3 shown in FIG. 1, and is pushed down until the tip 13b of the taper forming portion 13a projects downward from the lower surface portion 14b of the plate member 14 as shown in FIG.

After removing the punch 13, the protruding portion 14c of the plate material 14 is removed by a cutter or the like to form a quadrangular pyramidal tapered hole 14a, as in FIG. 1 (c). Such a quadrangular pyramid taper hole 14a can also be used as a small hole.

FIG. 4 is a top view showing a modification of the shape of the pyramid hole. In the case of FIG. 4, a hexagonal pyramid tapered hole formed by using a punch having a regular hexagonal cross section is shown. . Of course, the hole shape is not limited to the regular shape, and various modifications can be made.

Various sectional shapes of the tapered hole can be considered. For example, as shown in FIG.
It is possible to form a hole shape having the tapered hole 24a on the upper surface R by forming the R shape 24e on the 4d side and removing the protruding portion 24c.

Further, as shown in FIG. 6, it is also possible to form a tapered hole 34a having a straight portion 34f formed on the upper surface portion 34d side of the plate member 34. In this case as well, the protruding portion 34 is formed after punching with a shape punch (not shown).
It can be made by removing c.

Next, a second embodiment of the processing method of the present invention will be described. FIG. 7 is a cross-sectional view showing one step during processing. Reference numeral 44 is a plate material to be a product, and 45 is a plate material as a dummy laid below the plate material 44. The punch 43 is held by an upper die (not shown), and an escape hole (not shown) of a protruding portion is formed in the lower die. The punch 43 is pushed into the plate material 44, and when the tip portion 43b of the conical portion 43a of the punch cuts the plate material 44 into the plate material 45, the punch 43 is removed, and the plate material 44 and the plate material 4 are inserted.
By peeling 5 away, the plate member 44 can form the tapered hole 44a without post-processing of the protruding portion.

A third embodiment of the present invention will be described below with reference to FIG. FIG. 8 shows a method of simultaneously processing a large number of holes. FIG. 8A is a side view showing a punch shape.
(B) is a top view showing the processed plate material. Punch 5
3 has a large number of conical portions 53a, 53b, 53c, 53
d is formed so as to project. Push this into the plate 54,
By removing the protruding portion protruding to the lower surface side of the plate member 54, the tapered holes 54a, 54a arranged in a line on the plate member 54,
b and 54c can be formed.

FIG. 9 is a top view showing a modified example of the plate material in which the parallel holes are processed. The many holes formed in FIG. 9 are quadrangular when viewed from the top. That is, the tapered hole has a quadrangular pyramid shape. Of course, as a modification,
It is possible to form various hole shapes other than the quadrangular pyramid.

FIG. 10 shows a fourth embodiment of the present invention. (A) is a top view of a plate material and (B) is a side view of a punch. In the case of FIG. 10, the punch is not formed in a single row, but a large number of punches are formed in rows and columns. Therefore, a large number of conical holes are formed in the plate material in rows and columns.

[0024]

As described above, according to the present invention, in forming a taper hole in a plate material, if the punch is pressed to transfer the shape of the punch and the protruding portion protruding downward is removed, it is very effective. You can easily make tapered holes. Moreover, various taper shapes can be obtained, and a large number can be easily formed. Furthermore, very small holes can be easily formed, and the effect of the present invention is great.

[Brief description of drawings]

FIG. 1 shows a step of forming a tapered hole in a plate material, (A)
Is the state before processing, (B) is the process of pushing the punch,
(C) is a protruding portion removing step, and (D) is a completion step.

FIG. 2 is a top view of the hole formed in the step of FIG. 1 viewed from the top surface direction.

FIG. 3 shows a modified example of the present invention, in which (A) is a sectional view and (B) is a top view.

FIG. 4 is a top view showing a modified example of the present invention.

FIG. 5 is a sectional view showing a modified example of the present invention.

FIG. 6 is a cross-sectional view showing a modified example of the present invention.

FIG. 7 is a cross-sectional view showing a step during processing according to the second embodiment of the present invention.

FIG. 8 shows a processing method according to a third embodiment of the present invention,
(A) is a side view showing a punch shape, and (B) is a top view showing a processed plate material.

FIG. 9 is a top view showing a modified example of the plate material in which the parallel holes are processed.

FIG. 10 shows a fourth embodiment of the present invention, (A) is a top view of a plate material, and (B) is a side view of a punch.

[Explanation of symbols]

1 Upper mold 2 Lower mold 3, 13, 43, 53 Punch 4, 14, 24, 34, 44, 54 Plate material 4a, 14a, 24a, 34a, 44, 54a Tapered hole 4c, 14c, 24c, 34c Projection part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Zeno Masafune 6-12 Hommachi, Tanashi City, Tokyo Citizen Watch Co., Ltd. Tanashi Factory

Claims (3)

[Claims] 1. A method of machining a tapered hole for punching a tapered hole in a plate material, comprising forming a tapered shape at the tip of the punch, and forming the tapered portion until the tip of the tapered portion projects from the lower surface of the plate material. A method for processing a tapered hole, characterized in that the tapered shape is transferred by pressing from the upper surface of the plate material, and the plate material protruding to the lower surface side of the plate material is removed. 2. The method for processing a tapered hole according to claim 1, wherein a dummy plate material is laminated on the plate material, and the dummy plate material is removed after processing the tapered hole. 3. The method for processing a tapered hole according to claim 1, wherein the punch has a structure in which a plurality of tapered portions are formed.