JPH10100101A - Hole saw and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deformation, improve cutter strength, promote uniformity of quality, increase treatment speed, obtain a higher reliability and a stability, so as to manufacture a product without relying upon only what a material is. SOLUTION: A cylindrical inclined portion 11 having an inclining angle allowable in view of an inner diameter of a cylindrical portion 3b of a cylindrical cutter 3. The inner diameter portion of the cylindrical cutter 3 is inserted in the cylindrical inclined portion 11 to be held thereon. At least one deformed portion 23 is formed on a holder 9 and a cylindrical portion 3c both of which are formed integrally with the cylindrical cutter 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hole saw which is a cylindrical cutting tool having a saw blade material formed in a cylindrical shape, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as a general method of assembling a cylindrical cutting tool (hole saw) which is formed by using a commercially available saw blade material in a cylindrical shape, cutting and bending are performed according to a required drilling diameter. In most cases, both end faces are assembled by TIG welding or spot welding. In addition, there is a detachable type in which a work using a screw or a work in a mounting bracket is performed.

[0003]

However, in the case of a welded product, it is difficult to evaluate welding and there is a problem in stability. In the case of a detachable type, the structure is complicated and expensive, and each has advantages and disadvantages. As described above, the welded product currently lacks stability in bending accuracy and edge welding, and in addition, the cylindrical shape is deformed due to the release of stress during bending during quenching and tempering. There is. Also, in the bending process, if the diameter of the material is particularly small with respect to the material and thickness of the material, there is a possibility that the product may be restricted.

[0004] An object of the present invention is to improve the strength of a blade, prevent its deformation, uniformize its quality, and speed up the processing without depending on only the material of the material in order to solve the above problems. Accordingly, an object of the present invention is to provide a hole saw and a method for manufacturing the same, which can improve the reliability and stability of the production.

[0005]

In order to achieve the above object, the present invention relates to a cylindrical cutting tool comprising a saw blade material formed in a cylindrical shape and having a cutting edge portion and a cylindrical portion. Provide a cylindrical inclined portion having an inclination angle of the allowable range of,
A hole saw is provided with a blade holding metal fitting, which is formed by inserting an inner diameter of the cylindrical blade into the cylindrical inclined portion and holding the same, and integrally molding the cylindrical blade with the blade.

According to another embodiment of the present invention, in a cylindrical cutting tool made of a saw blade material having a cylindrical shape and having a cutting edge portion and a cylindrical portion, an inclination angle of an allowable range of the inner diameter of the cylindrical portion is set. A method for manufacturing a hole saw, characterized in that an inner diameter of the cylindrical blade is inserted and held in a cylindrical inclined portion, and is integrally formed with the cylindrical blade.

According to still another embodiment of the present invention, a cylindrical cutting tool has at least one deformed portion in a cylindrical portion.

As a result, the hole saw is prevented from being deformed without depending on the production of the material alone,
The blade strength is improved, the quality is uniform, the processing is quick, and the reliability and stability of production can be improved.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view of an essential part of an embodiment of the present invention. FIG. 1A is a state in which a blade is mounted before press working, FIG. 1B is a state after press working, and FIG. 1A and 1B are perspective views of the inside and outside holding fittings 1, wherein FIG. 3A is an inside holding fitting, FIG. 2B is an outside holding fitting, and FIG. 3 is a perspective view of FIG. 1. 1 to 3, a hole saw 1 is attached to an inner or outer diameter of a cylindrical blade 3 and a cylindrical portion 3 b of the cylindrical blade 3, and inner and outer holding brackets for integrally holding the cylindrical blade 3. 5 and 7. The cylindrical blade 3 includes a cutting edge 3a and a cylindrical portion 3b, and is formed by cutting, bending, and welding both ends of a saw blade material in accordance with a required hole diameter.

The inner holding fitting 5 is provided with a cylindrical inclined portion 5c. The cylindrical inclined portion 5c is capable of deforming the material or expanding or contracting the dimensions of the material during the processing of the cylindrical cutting tool 3,
It is an inspection means for confirming whether or not it is within a tolerance range that can be used and inspecting it, and a correcting means for making the cylindrical cutting tool 3 as close as possible to a perfect circle. Therefore, the cylindrical inclined portion 5c is determined by the degree of deformation and the degree of expansion and contraction of the cylindrical blade 3, and simultaneously determines the quality of the cylindrical blade 3 during assembly.

Reference numeral 5a denotes an inclined portion 5c of the inner holding member 5.
At the insertion end (upper end of the inner holding metal fitting 5 in FIG. 1), the inner diameter of the cylindrical cutter 3 is made smaller than the inner diameter, and the lower end 5b is larger than the maximum allowable difference of the inner diameter of the cylindrical cutter 3. The dimensions are set in consideration of the blade tolerance range so that the blade 3 does not penetrate. The cylindrical blade 3 is inserted from the insertion side end 5a, and is inserted to any position of the cylindrical inclined portion 5c.

The outer holding member 7 is a cylindrical part 3 of the cylindrical blade 3.
It is mounted along the outer diameter of b and is formed by a press die (not shown) and deformed while holding the cylindrical cutting tool 3 from the outside together with the inner holding metal fitting 5. This press mold can apply a uniform pressure from all directions, and it is important to consider the pressure balance. In particular, the upper end portion 7a of the outer holding member 7 holds the upper end portion 5a of the inner holding member 5, and the lower end portion 7b of the outer holding member 7 holds the lower end portion 5d of the inner holding member 5. The pressurized state is determined based on the inclination of the outer holding member 5 and the degree of retreat of the lower end 5 d of the inner holding member 5.

Therefore, it is necessary to select the pressing force of the press working in accordance with the finished state of the inner and outer holding fittings 5, 7 and the working diameter. Although a slight gap is generated inside the pressure holding metal fittings 5 and 7, a resin material serving as a binder is mixed into the gap at the time of assembling, thereby improving the joining safety of the joining portion. It is possible to plan.

Further, in the machining of parts, the tolerance of the precision of the parts can be increased by the cylindrical inclined portion 5c having a tolerance range that can be used, and the press processing depends on the press die. Therefore, it is not necessary to perform the end face treatment, and the number of steps can be reduced. In addition, 5e shown in FIG. 2A is an internal screw screwed into a holder (not shown).

FIG. 4 is a sectional view of a main part of another embodiment of the present invention. FIG. 4 (A) shows a blade mounted state before press working, FIG. 4 (B) shows a state after press working, and FIG. FIG. 5 is a perspective view of the blade holding fitting of FIG. 4. In FIGS. 4 and 5, the blade holding fixture 9 is integrally formed and has a cylindrical inclined portion 11 for holding the inner diameter of the cylindrical blade 3 and an outer holding portion 13 for holding the outer diameter of the cylindrical blade 3. . The upper end 11a of the cylindrical inclined portion 11 on the insertion side is smaller than the tolerance of the inner diameter of the cylindrical blade 3, and the cylindrical blade 3 is inserted.

At this time, the cylindrical inclined portion 11 and the outer holding portion 1
The groove 15 provided between the cylindrical cutter 3 and the cylindrical cutter 3 has a dimension exceeding the maximum allowable outer diameter of the cylindrical cutter 3.
Of the cylindrical portion 3b stops at the cylindrical inclined portion 11 or stops at the groove portion 15. Therefore, at this time, it is inspected whether the tolerance of the cylindrical blade 3 is out of the tolerance of the cylinder, and the quality is determined.

As described above, the cylindrical blade 3 passes the inspection by the cylindrical inclined portion 11, and is pushed outward by the press die (not shown) at the upper end 11 a on the insertion side of the cylindrical inclined portion 11. The outer diameter holding portion 13 is pushed inward from the upper end portion 13a. By such a pressurizing method, the cylindrical holding fitting 9 integrally holds the cylindrical cutting tool 3.
At this time, a slight gap is generated in the pressurized portion, but it is easy to improve the joining stability by mixing the same resin or the like as in FIG. Note that 9a shown in FIG. 4 is an internal screw screwed into a holder (not shown).

FIG. 6 is a schematic sectional view of still another embodiment of the present invention. FIG. 6 (A) shows a blade mounted state before press working, FIG. 6 (B) shows a state after press working, and FIG. FIG. 7 is a perspective view of the blade holding fitting of FIG. 6. 6 and 7,
The blade holding bracket 17 has an insertion-side end portion (upper end portion of the holding bracket 17 in FIG. 6) 19 a of the cylindrical inclined portion 19.
, The cylindrical blade 3 is inserted from the upper end 19a on the insertion side, and a required adhesive surface area is secured at any position of the cylindrical inclined portion 19. Thereby, the press die pushes and expands the upper end portion 19a of the cylindrical inclined portion 19 outward, and the blade holding bracket 17 integrally holds the cylindrical blade 3.

At this time, the outer diameter of the blade holder 17 has a width portion 17a equivalent to the outer diameter of the cylindrical blade 3, and the outer holder 7 shown in FIG. 1 or the outer holder 13 shown in FIG. Has been. This is because the required strength can be maintained by securing the cylindrical inclined portion 19 or the bonding surface area due to the development of welding technology in recent years, and the production of a hole saw that can penetrate into the drilled hole. Is realized.

Also, by using these holding metal fittings, the external shape can be freely selected by the press die, the degree of design can be increased, the shape can be easily changed, and it is impossible especially in turning or the like. Shape is also possible. In addition, at the time of disposal, even when different materials are used due to the configuration of the parts, the parts can be individually disposed of by cutting or the like.

FIG. 8 is a schematic explanatory view of a deformed portion provided on the surface of the cylindrical portion of the cylindrical blade, wherein FIG. 8A is a perspective view and FIG. 8B is a sectional view. At one or more locations (two locations in the figure) of the cylindrical portion 3b of the cylindrical blade 3,
A waist-in process is performed by providing a strip-shaped deformed portion 21 having a predetermined width. As a result, generally, materials with high material strength have poor weldability, and materials with low material strength have good weldability, but the weldability is considered without depending only on the material of the material. In addition, the purpose is to improve the strength by the deformed portion 21 shown in FIG.

FIG. 9 is a schematic explanatory view of a deformed portion provided on the surface of the cylindrical portion of the cylindrical blade. FIG. 9A is a perspective view, and FIG. 9B is a sectional view. In the figure, one or more portions of the cylindrical portion 3b of the cylindrical cutter 3 (2 in the figure)
In this case, a rib-like effect is provided by providing a band-shaped processing-deformed portion (rib in this embodiment) 23 having a predetermined width inward or outward (outward in the figure) at a predetermined position.

FIGS. 10A and 10B are schematic explanatory views of a deformed portion provided on the surface of the cylindrical portion of the cylindrical blade, wherein FIG. 10A is a perspective view and FIG. 10B is a sectional view. In the figure, the end of the cylindrical portion 3b of the cylindrical cutter 3 is fan-shaped,
It is referred to as a processing deformation portion 25. At this time, the blade holding bracket 5,
7, 9, and 17 also have shapes conforming to the deformed portion 25,
It should be easy to adhere to each other. In order to improve the adhesion effect, a hole having an appropriate shape may be provided.

FIG. 11 is a schematic explanatory view of a deformed portion provided on the surface of the cylindrical portion of the cylindrical blade. FIG. 11A is a perspective view, and FIG. 11B is a sectional view. In the figure, at a plurality of positions of the cylindrical portion 3b of the cylindrical blade 3, a suitably deformed portion having a suitable size, in the present embodiment, a dent 27 is provided inside or outside. The dent 27 is subjected to so-called dimple processing, and is made to easily adhere to the blade holding metal fittings 5, 7, 9, and 17 by increasing the surface area.

The processing deformation portions 21, 23, 25,
Numeral 27 is a means for preventing resonance of the blade main body which occurs at the time of cutting, and has effects such as attachment / detachment, prevention of blade removal / rotation, and the like. The present invention is not limited to the above-described embodiment, but can be implemented in other embodiments by making appropriate design changes.

[0027]

As is apparent from the above description, the hole saw and the method for manufacturing the same according to the present invention are provided with a cylindrical inclined portion having an allowable inclination angle of the inner diameter of the cylindrical portion of the cylindrical blade. The problem of the prior art can be easily achieved by inserting and holding the inner diameter of the blade-shaped blade, and providing at least one processing-deformed portion in the blade and the cylindrical portion integrally formed with the blade. And its production does not depend only on the material of the material, its deformation is prevented, blade strength is improved, its quality is uniform, processing is quick, and the reliability and stability of the production are improved. Can be done.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of an embodiment of the present invention, in which FIG. 1A shows a blade mounted state before press working, and FIG. 1B shows a state after press working.

FIGS. 2A and 2B are perspective views of the inside and outside holding members of FIG. 1, wherein FIG. 2A shows an inside holding member and FIG. 2B shows an outside holding member.

FIG. 3 is a perspective view of FIG. 1;

FIG. 4 is a sectional view of a main part of another embodiment of the present invention, wherein FIG. 4 (A) shows a blade mounted state before press working, and FIG. 4 (B) shows a state after press working.

FIG. 5 is a perspective view of the blade holding fitting of FIG. 4;

FIG. 6 is a schematic cross-sectional view of still another embodiment of the present invention, wherein FIG. 6A shows a blade mounted state before press working, and FIG. 6B shows a state after press working.

FIG. 7 is a perspective view of the blade holding fitting of FIG. 6;

FIGS. 8A and 8B are schematic explanatory views of a deformed portion provided on the surface of the cylindrical portion of the cylindrical blade, wherein FIG. 8A is a perspective view thereof and FIG. 8B is a sectional view thereof.

FIGS. 9A and 9B are schematic explanatory views of a deformed portion provided on the surface of the cylindrical portion of the cylindrical blade, wherein FIG. 9A is a perspective view thereof and FIG. 9B is a sectional view thereof.

FIG. 10 is a schematic explanatory view of a deformed portion provided on the surface of a cylindrical portion of a cylindrical cutting tool. FIG. 10A is a perspective view thereof, and FIG. 10B is a sectional view thereof.

FIGS. 11A and 11B are schematic explanatory views of a deformed portion provided on the surface of the cylindrical portion of the cylindrical cutting tool. FIG. 11A is a perspective view thereof, and FIG. 11B is a sectional view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hole saw 3 Cylindrical blade 5 Inner holding metal 5c Cylindrical inclined part 7 Outer holding metal 9, 17 Blade holding metal 11 Cylindrical inclined part 13 Outer holding part 19 Cylindrical inclined part 21, 25 Working deformed part 23 Rib 27 Dot

Claims (3)

[Claims] 1. A cylindrical cutting tool comprising a saw blade material formed in a cylindrical shape and having a cutting edge portion and a cylindrical portion, provided with a cylindrical inclined portion having an inclination angle within an allowable range of the inner diameter of the cylindrical portion,
A hole saw, comprising: a blade holding fitting which is inserted and held in the cylindrical inclined portion with an inner diameter of the cylindrical blade and is formed integrally with the cylindrical blade. 2. A cylindrical cutting tool comprising a saw blade material formed in a cylindrical shape and having a cutting edge portion and a cylindrical portion, wherein the cylindrical inclined portion having an allowable inclination angle of the inner diameter of the cylindrical portion is formed on the cylindrical inclined portion. A method for manufacturing a hole saw, wherein an inner diameter of a blade-shaped blade is inserted and held, and is integrally formed with the cylindrical blade. 3. The hole saw according to claim 1, wherein the cylindrical blade has at least one deformed portion in a cylindrical portion.