JPH11285921A - Universal blade type circular saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform cutting without requiring any exchange of a blade even when material, a dimension, or thickness of a workpiece varies and to provide cutting efficiency and a cutting life equal to those of a conventional one in a circular saw mainly used for cutting metallic material such as steel, copper, or an aluminum alloy. SOLUTION: In a universal blade type circular saw 10, a rake angle γ is 0-18 deg. while a clearance angle α is 20-25 deg., a rake face 5 and a clearance face 6 are smoothly connected together via two or more curved lines in the vision from the side face, a cutting blade height (h) is not less than 0.5 P, and a pitch P between cutting blades arranged longitudinally in the circumference direction is 3-8 mm. In this way, regardless of the material, dimension, and thickness of a workpiece, cutting can be carried out by a substantially single kind of blade type/pitch with cutting efficiency and a cutting life approximately equal to those of a conventional one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a universal blade type circular saw used mainly for cutting metallic materials such as steel, copper and aluminum alloys.

[0002]

2. Description of the Related Art Conventionally, circular saws include metal saws made of round steel plates of high-speed tool steel, chip saws having tips of carbide, cermet, diamond, etc. attached to the cutting edge, and materials to be cut by high-speed rotation. Friction saw that uses frictional resistance to cut, hot steel billet, pipe /
There is a hot saw for cutting a shape steel or the like. Of these,
In particular, small materials such as small-diameter rods and thin-walled
In applications where cutting is inexpensive and highly accurate,
A metal saw made of high-speed tool steel having an outer diameter of about 200 to 500 mm is often used.

[0003] By the way, as shown in Figs. 7 and 8, for example, a blade saw used in a conventional metal saw has a circular saw (20).
The first cutting edge (high blade) (21) has tapered chamfers (23) and (23) chamfered on the left and right sides on the lower end, and the second cutting edge (low blade) (22) has There is no chamfer. The difference d between the height of the cutting edge of the first cutting edge (21) and the height of the cutting edge of the second cutting edge (22) is about 0.15 to 0.25 mm. A tip pocket (24) is provided between the first and second cutting edges (21) and (22).
Are formed. Conventionally, for example, as shown in FIG. 11, the cutting blade width portion of the material to be cut (28) is cut with as large a "cutting depth per blade Sz" as possible,
The generated chips (29) are curled in the tip pocket (24) and stored without gaps, and the cutting edges (21) and (22) are
While rotating outside the, it is trying to discharge this outside the cut surface. Therefore, conventionally, the rake angle γ is designed to be large, for example, 16 to 20 °, so that the cutting resistance is reduced, and a large Sz is possible. This blade type
In order to maintain sufficient edge strength, the clearance angle α is, for example, 10
Since it is necessary to reduce the cutting edge height h, that is, the chip pocket (space) (2) in which the chips (29) are stored.
4) could not be made too large, and h was about 0.4P. Therefore, in order for the generated chips (29) to be completely housed in the chip pocket (24) and to be easily discharged during idling, it is necessary to adjust the chip production per tooth. Therefore, the size of the tip pocket (24) must be adjusted. That is, the maximum simultaneous meshing blade number Zi in the section of the material to be cut is appropriate (in the case of a normal steel round bar,
It is necessary to change the number of blades / pitch of the circular saw (20) according to the size of the workpiece (28) so that i = about 3 to 5). If the maximum simultaneous meshing blade number Zi is too large, cutting may not be possible due to clogging of chips (29) as shown in FIG. If the number of blades is too small, Sz becomes too large and an impact force is applied to the blade edge, causing the blade edge to be broken or vibrated. I will.

[0004]

As described above, the conventional metal saw has a relatively small cutting resistance if the number of blades / pitch is appropriately selected according to the size of the material to be cut. There is no clogging of chips, and good cutting performance and good cutting edge life are maintained. However, when the size of the material changes, it is necessary to replace with a different number of blades / pitch each time. Therefore, there is no problem when cutting a certain material and size at all times, but when it is necessary to cut various materials and sizes with one cutting machine, a circular saw is used. The time loss required for replacement is large. Furthermore, it is necessary to stock circular saws having various numbers of blades, and there is a problem that the complexity of inventory management increases when re-scoring products are included.

In particular, in the case of high-speed cutting of a light metal or a thin material, as shown in FIGS. 11 and 12, a conventional circular saw (30) is used.
Has a small rake angle γ (usually about 6 °) and a cutting edge (3
1) A fine blade with a pitch P between (31) is used,
In the case of this blade type, the cutting edge height h is small and the radius R of the blade bottom in the tip pocket (34) is small, so that the chip clogging when cutting at a relatively low speed is performed. Problem is not solved.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and it is not necessary to replace the material even when the material, size and thickness of the material to be cut change. Another object of the present invention is to provide a universal blade type circular saw capable of obtaining approximately the same cutting efficiency and cutting edge life.

[0007]

In order to achieve the above object, a circular saw according to the present invention has a rake angle γ of 0 to 18 ° and a clearance angle α of 20 to 25 °, and a rake face and a flank face. Are smoothly connected by two or more curves as viewed from the side, and the cutting edge height h is h ≧ 0.5P,
It is characterized in that the pitch P between the cutting edges before and after in the circumferential direction is 3 to 8 mm.

[0008]

Next, an embodiment of the present invention will be described.
This will be described with reference to the drawings. First, referring to FIG. 1, a circular saw (10) of the present invention comprises a large number of first and second cutting blades (high and low blades) (1) which are alternately arranged at predetermined intervals (pitch P) in a circumferential direction. (2). A rotary shaft insertion hole (7) is formed in the center of the circular saw (10). Referring to FIGS. 2 and 3, the first cutting edge (high blade) (1) of the circular saw (10) is a tapered chamfered portion (3) in which 1/3 blade width portions on both left and right sides at the lower end are chamfered. The second cutting edge (low blade) (2) does not have this chamfer, and the left and right sides are vertical. The height of the cutting edge (1a) of the first cutting edge (1) and the height of the second cutting edge (2)
The difference d from the height of the cutting edge (2a) is about 0.15 to 0.25 mm. A tip pocket (4) is formed between the first and second cutting edges (1) and (2). In addition, each of the first and second cutting edges (1) and (2) has a rake angle γ of 0-18.
°, and the clearance angle α is increased to 20-25 °,
And, by smoothly connecting the rake face (5) and the flank face (6) of the first and second cutting edges (1) and (2) with two or more curves as viewed from the side, the tip pocket (4) The height h, that is, the cutting edge height h, is defined as h ≧ 0.5P, preferably h ≧
0.55P. Cutting edges before and after in the circumferential direction (1) (2)
Is 3 to 8 mm. The point that two blades (height blades) (1) and (2) having different heights are made into one set is not different from the conventional one, but since the cutting depth Sz per blade is small, the height difference d Is d ≦ 0.1 mm.

The function and operation of the blade according to the present invention will be described below. Generally, when the rake angle γ is reduced,
It is known that since it becomes so-called "hole-shaped" chips, the cutting resistance fluctuates greatly, and the cutting blades are greatly worn or chipped, and the cut surface becomes rough. In particular, it is a swarf form often seen when a material with high ductility is cut at a low speed.
However, this is the case where the cut depth is set to a certain size or more, and when the cut depth is small, not only such disadvantages are caused. A feature in the case where the rake angle γ is small is that while the cutting resistance increases, the cutting ratio r (r = cut depth / chip thickness) decreases. The reason why the cutting ratio r becomes small is that the chip thickness becomes relatively large, and since the stress difference between the front and back surfaces of the chip becomes large, unless the cutting depth is excessive, the chip has a small curvature. Curls at the radius. Therefore, even when the cutting edge pitch P is reduced and cutting is performed under normal rotation and feed conditions, if the cutting depth Sz per blade is reduced, for example, as shown in FIG.
The chips (9) of the material to be cut (8) curl small and break in a short time. Even if the material is highly ductile, for example, as shown in FIG.
Since (9) is small and curled, the chip (9) also has elasticity and does not clog the blade bottom. However, in the case of a material such as stainless steel, which is easily work-hardened, the rake angle γ (γ = 16 to 18 °) of the related art makes the generation of chips smoother. By increasing the angle of inclination and the height of the cutting edge, chip clogging can be prevented.

Furthermore, since the rake angle γ is reduced, the edge strength can be sufficiently maintained even when the clearance angle α is increased, thereby increasing the cutting edge height h. Become. For this reason, the chip pocket (4) becomes large, which has the effect of making it difficult for the chips (9) to be clogged.Furthermore, since the clearance angle α is large, the flank wear is reduced, and the life of the cutting edge is improved. .

FIG. 6 is a conceptual diagram showing the relationship between the size and thickness of the material to be cut and the cutting feed speed (cutting efficiency). In the case of the blade die of the present invention, even if the cutting blade pitch is not changed in accordance with the size of the material to be cut, cutting becomes impossible due to clogging of the chips, and furthermore, it is almost the same as the conventional blade die. Equivalent cutting efficiency can be obtained.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings. Example 1 A circular saw (10) of the present invention shown in FIGS. 1 to 3 was manufactured and subjected to a cutting test. The body plate of the circular saw (10) has a steel plate (JIS
SS400), and high-speed tool steel was used for the outer peripheral cutting edge in the circumferential direction. As the material to be cut, material JIS SC
M440H (hardness: HRC30) and size 40
A cutting test was performed using a steel round bar of mm. Circular saw (1
Table 1 below shows the specifications and cutting conditions of 0). As the life of the cutting edge, the number of cuts was measured at a flank wear of 0.3 mm, and the obtained results are shown in Table 1 below.

Comparative Example 1 For comparison, a cutting test similar to that described above was performed using a conventional circular saw, and the results obtained are shown in Table 1 below.

Example 2 A cutting test is performed in the same manner as in Example 1 except that the material to be cut is JIS S45C (hardness: HB
180) and a steel round bar having a diameter of 32 mm was used.
In addition, the number of cuts was similarly measured as the cutting edge life, and the obtained results are shown in Table 2 below.

Comparative Example 2 For comparison, the same cutting test as in Example 2 was performed using a conventional circular saw, and the results obtained are shown in Table 2 below.

Example 3 A cutting test was carried out in the same manner as in Example 1 above, except that a JIS SUS304 material and a pipe material having a diameter of 70 mm and a thickness of 8 mm were used as the material to be cut. In addition, the number of cuts was similarly measured as the cutting edge life, and the obtained results are shown in Table 2 below.

Comparative Example 3 For comparison, the same cutting test as in Example 3 was performed using a conventional circular saw, and the results obtained are shown in Table 2 below.

[0018]

[Table 1]

[0019]

[Table 2]

[0020]

[Table 3]

As is clear from the results shown in Tables 1 and 2, according to the circular saw product of the present invention, it was possible to cut with any kind of material and dimensions with one kind of blade. Moreover, the cutting efficiency (feed speed) is 80% or more of that of the conventional blade, and the life of the cutting blade is smaller than that of the conventional blade because of the feature that the flank wear is reduced.
On the other hand, according to the conventional circular saw products, it is necessary to replace the circular saw with three types having different numbers of blades / pitch due to changes in the material and dimensions of the material. Further, it is necessary to stock circular saws having various numbers of blades, which causes a problem that inventory management is complicated. Moreover, the cutting edge life was inferior to the circular saw product of the present invention.

[0022]

As described above, the universal blade type circular saw according to the present invention has a rake angle γ of 0 to 18 ° and a clearance angle α of 20 to 20 °.
25 °, the rake face and the flank face are smoothly connected by two or more curves as viewed from the side face, and the cutting edge height h is h ≧ 0.5P, and before and after being aligned in the circumferential direction According to the present invention, the cutting material has a pitch P of 3 to 8 mm.
With almost one type of cutting edge / pitch, cutting can be performed with almost the same cutting efficiency and cutting edge life as a conventional cutting edge circular saw without considering the wall thickness. Therefore, the time required for replacing the circular saw can be saved, and since there is no need to stock many types of circular saws, there is an effect that the work efficiency is greatly improved.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing a circular saw product of the present invention.

FIG. 2 is an enlarged front view of a blade mold portion of the product of the present invention.

FIG. 3 is an enlarged sectional view of the same.

FIG. 4 is an enlarged front view of a blade mold portion showing a state of generation of chips when cutting is performed using the product of the present invention.

FIG. 5 is an enlarged front view of a blade-shaped portion showing another example of the state of the generation of chips.

FIG. 6 shows the size and thickness of the material to be cut and the cutting feed rate (cutting efficiency) when cutting is performed using the product of the present invention.
Is a conceptual diagram showing the relationship with the conventional example.

FIG. 7 is an enlarged front view of a blade portion of a conventional circular saw product.

FIG. 8 is an enlarged sectional view of the same.

FIG. 9 is an enlarged front view of a blade portion showing a state of generation of chips when cutting is performed using a conventional circular saw product.

FIG. 10 is an enlarged front view of a blade-type portion showing an example of the state of generation of the same chips.

FIG. 11 is an enlarged front view of a blade portion of another conventional circular saw product.

FIG. 12 is an enlarged sectional view of the same.

[Explanation of symbols]

 Reference Signs List 1 first cutting edge (high blade) 2 second cutting edge (low blade) 3 chamfered part 4 pocket 5 rake face 6 flank 10 circular saw

[Procedure amendment]

[Submission date] February 15, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

In order to achieve the above object, a universal blade type circular saw according to the present invention is provided with a circular saw for a predetermined distance in a circumferential direction.
A large number of primary and secondary batteries alternately arranged at intervals (pitch P)
And the second cutting edge (high and low blades), the first cutting edge (high blade)
The lower end has tapered chamfers on both left and right sides.
The cutting edge (low edge) does not have this chamfer, and the left and right sides
The surface is vertical and the rake and flank are
Smoothly connected by two or more curves when viewed from the side, and
The cutting edge height h is h ≧ 0.5P and is arranged in the circumferential direction
A circular saw with a front and rear cutting edge pitch P of 3 to 8 mm
The rake angle γ of each cutting edge is 0 to 18 ° and the clearance angle α
There has been characterized by a 20-25 °.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

As is evident from the results of Tables 1 to 3 , according to the circular saw product of the present invention, it was possible to cut with any kind of material and dimensions with one kind of blade. Moreover, the cutting efficiency (feed speed) is 80% or more of that of the conventional blade, and the life of the cutting blade is smaller than that of the conventional blade because of the feature that the flank wear is reduced.
On the other hand, according to the conventional circular saw products, it is necessary to replace the circular saw with three types having different numbers of blades / pitch due to changes in the material and dimensions of the material. Further, it is necessary to stock circular saws having various numbers of blades, which causes a problem that inventory management is complicated. Moreover, the cutting edge life was inferior to the circular saw product of the present invention.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

[0022]

As described above, the universal blade type circular saw according to the present invention is arranged alternately at predetermined intervals (pitch P) in the circumferential direction.
Has a large number of first and second cutting edges (high and low blades)
The first cutting edge (high blade) is tapered on the left and right sides at the lower end.
-The second cutting edge (low blade) has this chamfer.
There are no ridges, the left and right sides are vertical surfaces,
The rake face and flank face
Seen smoothly with two or more curves, and the cutting edge height
H is h ≧ 0.5P, and cuts before and after in the circumferential direction
In circular saws with a pitch P of 3 to 8 mm,
Re rake angle γ is 0 to 18 ° blade and relief angle α is 20
Characterized in that it is 25 °, according to the universal blade type circular saw of the present invention, and the material of the workpiece, the size, without considering the thickness, most one cutting die / pitch This makes it possible to perform cutting with almost the same cutting efficiency and cutting edge life as a conventional blade-type circular saw. Therefore, the time required for replacing the circular saw can be saved, and since there is no need to stock many types of circular saws, there is an effect that the work efficiency is greatly improved.

Claims (1)

[Claims] 1. A rake angle γ of 0 to 18 ° and a clearance angle α
Is 20 to 25 °, the rake face and the flank face are smoothly connected by two or more curves as viewed from the side face, and the cutting edge height h is h ≧ 0.5P, and the circumferential direction is The pitch P between the front and rear cutting edges is 3 to 8 mm.