JP2003251525A - Circular saw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circular saw applicable to both of a hard material to be ground and a soft material to be ground. <P>SOLUTION: This circular saw is constituted in such a way that cemented carbide tips 3 are fixed to cutting edge body parts 2 formed in an outer peripheral fringe part of a circular saw body 1, respectively, a first face S<SB>1</SB>is formed adjacent to a front end fringe of a flank 4 in each cemented carbide tip 3, and a second face S<SB>2</SB>is formed on a front side face 7 of the cemented carbide tip 3 adjacent to the first face S<SB>1</SB>. The first face S<SB>1</SB>is composed of a first face part S<SB>11</SB>on a front step side adjacent to a flank 4 side and a first face part S<SB>12</SB>on a rear step side adjacent to the second face S<SB>2</SB>. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circular saw with a cemented carbide tip used for cutting metal materials.

[0002]

2. Description of the Related Art FIG. 3 shows a part of a conventional circular saw, in which a blade body portion 2 is formed on the outer peripheral edge portion of a circular saw body 1 at equal or unequal circumferential intervals. The cemented carbide tip 13 is fixed, and the cemented carbide tip 13 is formed with a first rake face S ₁ adjacent to the front edge of the flank 4 and the first rake face S ₁ is formed.
A concave second rake surface S ₂ is formed on the front side surface of the cemented carbide tip 13 adjacent to the rake surface S ₁ .

In the cemented carbide tip 13 as described above, the length L _S of the first rake face S ₁ is approximately 0.2 to 0.5 mm.
In the range of, the rake angle γ ₁ is approximately -15 to -30 °
Is the range. With a circular saw whose first rake face S _{1 has} a length L _S and a rake angle γ ₁ in such a range, it is a hard-to-cut material such as stainless steel that is sticky and easily welded, or a soft material or a hard material. When cutting the work material of the material,
As shown in (a) or (b), the cutting with the cemented carbide tip 13 is not effectively performed, and the difference in cutting ability becomes large.

[0004] That is, (a) in FIG. 4 is -15 to-30 ° rake angle gamma ₁ of the first rake face S ₁ is, the length L _S is 0.
This is an example of cutting a steel material W of a soft material with a carbide tip 13 of 2 to 0.5 mm. in this case,
Since the chip t has good extensibility, the chip t carved into the first rake face S ₁ by the cemented carbide tip 13 has a long sliding distance on the first rake face S ₁ and exceeds the length L _S. , The force of contacting the second rake face S ₂ becomes stronger, and the spiral winding sticks to the second rake face S ₂ as shown in the drawing. For this reason, the cutting resistance is increased, the cutting heat is largely generated, and the damage of the cutting edge is accelerated.

Further, FIG. 4B shows the first rake surface S ₁
The rake angle γ ₁ and the length L _S thereof are the same as those in the case of FIG. 4 (a), in which the hard steel material W is cut by the same carbide tip 13, and in this case, the extension of the chip t Since the property is poor, the chip t carved out on the first rake face S ₁ by the carbide tip 13 has a shorter distance to slide on the first rake face S ₁ , and therefore slides toward the second rake face S ₂ side. No
When flowing from the first rake face S ₁ in the direction opposite to the steel material W and hitting the steel material W as shown in the drawing, the cutting resistance becomes excessive,
Chip t becomes thicker and shorter, which is why
A hole is formed in the rake face S ₁ and damage to the cutting edge is accelerated.

Therefore, in the prior art, the first rake face S
Than changing the _first rake angle gamma ₁ and its length L _S, with soft material and circular saw having a hard tip suitable for the work material, the hard tip adapted to work material hard material I prepared two types of circular saws, one of which was a circular saw and one of which was used properly.

According to the present invention, a rake face portion for a relatively hard work material and a rake face portion for a relatively soft work material are connected in series to the first rake face of each cemented carbide tip to form a single rake face. An object of the present invention is to provide a circular saw which can be applied to both a hard material and a soft material.

[0008]

The invention according to claim 1 is
The cemented carbide tips 3 are fixed to the blade bodies 2 formed on the outer peripheral edge of the circular saw body 1, and each cemented carbide tip 3 has a first rake face S ₁ adjacent to the front end edge of the flank face 4. Formed, this first
A circular saw in which a second rake surface S ₂ is formed on the front side surface of the cemented carbide tip 3 adjacent to the rake surface S ₁ , the first rake surface S ₁ being the front side adjacent to the flank 4 side. It is characterized by comprising a first rake face portion S ₁₁ and a rear-side first rake face portion S ₁₂ adjacent to the second rake face S ₂ .

According to a second aspect, in the circular saw according to the first aspect, the rake angle γ ₁₁ of the front side first rake face portion S ₁₁ is approximately −.
20 to -30 ° and its length L _{11 is} approximately 0.15 to 0.2
5 mm, the rake angle γ _{12 of} the rear side first rake face portion S ₁₂ is approximately −10 to −15 °, and the length L ₁₂ thereof is approximately 0.15 to 0.15.
0.25 mm, 0.2 to the sum of the length L ₁₂ of the front side length of the first rake face S ₁₁ L ₁₁ and the rear stage side first rake face S ₁₂
It is characterized by being larger than 0.5 mm.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an enlarged front view showing a part of a circular saw with a cemented carbide tip 3 according to the present invention and showing a cutting state of a work material W by the cemented carbide tip 3. See also FIG.
[Fig. 4] is an enlarged detailed view showing a part of the carbide tip 3 of the circular saw in an enlarged manner. As can be seen from these figures, the circular saw according to the present invention is such that the blade body portions 2 are formed on the outer peripheral edge portion of the disk-shaped circular saw body 1 at equal circumferential intervals (or at irregular circumferential intervals). , A blade chamber 6 is formed between the adjacent blade bodies 2 and 2, and a cemented carbide tip 3 is fixed to the tip side of each blade body 2 in the circular saw rotation direction (indicated by arrow P). Carbide tip 3 has flank 4
A first rake face S ₁ is formed adjacent to the front edge of the second rake face, and a concave second rake face S _{2 is} formed on the upper half of the front side face 7 of the cemented carbide tip 3 adjacent to the first rake face S _1. Is formed, and the first rake surface S ₁ is composed of a front-side first rake surface portion S ₁₁ adjacent to the flank surface 4 side and a rear-stage side first rake surface portion S ₁₂ adjacent to the second rake surface S _2. It is a thing.

In a preferred embodiment of each of the carbide tips 3, as can be seen from FIG. 2, the rake angle γ ₁₁ (the reference plane passing through the center of the circular saw body 1 of the first rake surface portion S ₁₁ on the preceding stage side. The angle formed between O and the first rake surface portion S ₁₁ on the upstream side is
Is used in a range approximately -20 to-30 °, and the length L ₁₁ of the first-stage first rake face S ₁₁ is approximately 0.15
Used in the range of 0.25 mm. Moreover, (the angle formed between the reference plane O and the rear side first rake face S ₁₂₎ the rake angle gamma ₁₂ second-stage first rake face S ₁₂ is approximately -10 to-15 °
Is used in the range of the length L ₁₂ of the second-stage first rake face S ₁₂ is used in the range of approximately 0.15 to 0.25 mm. The sum of the length L ₁₂ of the front side length of the first rake face S ₁₁ L ₁₁ and the rear stage side first rake face S ₁₂ are first rake face S ₁ length of conventional as shown in FIG. 3 Is larger than 0.2 to 0.5 mm which is L _S, that is, L
₁₁ + L _12> L preferably in the _S (0.2 to 0.5 mm). The length L ₁₁ of the front-side first rake face S _11, the length L ₁₂ of the second-stage first rake face S _12, preferably substantially the same. The second rake face S ₂ rake angle gamma ₂
Is used in the range of approximately 0 to 15 °.

Rake angle γ _{11 of} the first rake face portion S ₁₁ on the front stage side
The preferred range of use is about -20 to -30 as described above.
When the rake angle γ ₁₁ is smaller than the above range, for example, about -40 °, the cutting resistance becomes large, and the cutting edge wears due to the cutting heat, or a thermal crack occurs. , The damage of the cutting edge will be accelerated, and the rake angle γ ₁₁ is larger than the above range, for example, −1.
When it becomes about 0 °, the angle difference between the rake angle γ ₁₂ of the rear side first rake surface portion S ₁₂ becomes small, the effect due to the length L ₁₁ of the front side first rake surface portion S ₁₁ becomes weak, and the chip t is wound. This is because the shape (curl) becomes loose and the cutting resistance does not decrease.

Further, the length L _{11 of} the first rake face portion S ₁₁ on the front stage side
The preferred range of use of 0.1 is set to approximately 0.15 to 0.25 mm, as the length L ₁₁ becomes longer, the chips t cut out from the first rake surface portion S ₁₁ on the front stage side are separated from the chips t on the rear stage side. 1 When the force guiding from the rake face portion S ₁₂ to the second rake face S ₂ side becomes weak and the winding shape of the chip t becomes loose, and the length L ₁₁ becomes short, the above-mentioned guiding force becomes too strong. This is because the winding shape of the chip t is small and cramped, and the cutting resistance increases, so that the cutting heat accelerates the damage of the cutting edge.

[0014] rake angle gamma ₁₂ second-stage first rake face S ₁₂
The suitable use range of is set to a range of approximately −10 to −15 ° because the rake angle γ ₁₂ is smaller than the above range.
For example, at about −25 °, the angle difference between the rake angle γ _{11 of} the first rake surface portion S ₁₁ on the upstream side becomes small, the effect of the length L ₁₂ of the first rake surface portion S ₁₂ on the downstream side becomes weak, and the chips are small. This is because the winding shape of t becomes loose and the cutting resistance does not decrease, and the rake angle γ ₁₂ is larger than the above range.
For example, when the angle is −2 to −3 °, the chip t that has been carved into the first rake face S ₁₁ on the front stage side is strongly guided from the first rake face S ₁₂ on the rear stage side to the second rake face S ₂ side. This is because the winding shape of the chip t is small and cramped, the cutting resistance is not reduced, and the damage of the cutting edge due to cutting heat is accelerated.

The length L of the rear side first rake face portion S ₁₂
The suitable use range of ₁₂ is set to a range of approximately 0.15 to 0.25 mm because the length L ₁₂ becomes shorter than the above range and is carved out on the front side first rake surface portion S _11. The force that induces the chip t from the rear-side first rake face portion S ₁₂ to the second rake face S ₂ side becomes too strong, and the winding shape of the chip t becomes small. Therefore, the cutting resistance increases and the cutting heat increases. This is because if the damage to the cutting edge due to is accelerated and the length L ₁₂ thereof becomes longer than the above range, the above-mentioned inductive force becomes weak, the winding shape of the chip t becomes loose, and the cutting resistance does not decrease.

[0016] Then, at the front stage side length L ₁₁ and the rear stage side first rake face sum the length of the conventional first rake face S ₁ and the length L ₁₂ of the S ₁₂ L _S of the first rake face S ₁₁ There is 0.2-0.5
The reason why it is preferable to make it larger than mm (L ₁₁ + L ₁₂ > L _S ) is as follows. That is, when cutting the steel material W of a soft material with the carbide tip 13, the chips t carved in the first rake surface portion S ₁₁ on the front stage side strongly move to the first rake surface portion S ₁₂ on the rear stage side. However, L ₁₁ + L ₁₂ >
Due to the relationship of L _S (0.2 to 0.5 mm), the force by which the chips t fall on the second rake face S ₂ becomes weak and the cutting resistance becomes small. When cutting the hard steel material W, the length L ₁₁ of the first rake surface S ₁₁ on the front side is shorter than the length L _S of the conventional first rake surface S ₁ , and therefore the first rake surface on the rear side force acts to move the rake face S ₁₂ side, because the rake angle gamma ₁₂ second-stage first rake face S ₁₂ is greater than the rake angle gamma ₁ of the first rake face S ₁ of the prior art, the chip t is the second rake Surface S ₂
It becomes easier to flow to the side and cutting resistance becomes smaller.

Next, the operation of the circular saw provided with the cemented carbide tip 3 having the above-mentioned structure will be described with reference to FIGS. 1 and 2.

The circular saw main body 1 as shown in FIG. 1 when cutting a work material W is rotated in the direction of arrow P, were carved on the front side first rake face S ₁₁ of the first rake face S ₁ The flow of the chip t is corrected by the rear side first rake face portion S ₁₂ and guided to the second rake face S ₂ side, and hits the bottom portion 6a or the back portion 6b of the blade chamber 6 to wind the chip t. The shape of the chip is adjusted so that there is no large difference in the shape of the chip t regardless of whether the work material is hard or soft, and proper cutting can be performed without increasing the cutting resistance. .

[0019] If the action more fully described above, first, as the work material W, for example, in the case of using the above hard material steel S55C, the first rake face S ₁ of the preceding stage first rake face S _The chip t cut out to _{11 has} a length of the front side first rake face S ₁₁ which is about half the length L _S of the conventional first rake face S ₁ as compared with the conventional first rake face S _1. Since the chips t are short, the chips t are quickly transferred from the front side first rake surface portion S ₁₁ to the rear side first rake surface portion S ₁₂ side.

[0020] Since hard slope than the second-stage first rake face S ₁₂ is front-side first rake face S _11, chip t the operation proceeds to the subsequent stage side first rake face S ₁₂ is a flow in this rake face S ₁₂ It is straightened and guided to the second rake face S ₂ side. The guided chips t flow in the direction of the second rake face S ₂ to form a curl, and from the bottom 6a side of the blade chamber 6 to the back 6
It is spirally wound so as to follow b, and becomes a spiral chip t having a relatively large diameter and having a sufficient space between the curled portions as shown in FIG. In such a cutting state, the cutting resistance is small, the cutting heat does not rise, the cutting edge is not damaged, and the cutting surface becomes good. Therefore, the life of the saw can be extended and the cutting accuracy can be favorably maintained.

Further, as the work material W, for example, S10C to
In case of using the soft material of steel such as S20C are, front side of the first rake face S ₁ first rake face S ₁₁
The chip t that is cut out into the first rake surface S ₁ has a shorter length than the conventional first rake surface S ₁ and moves to the first rake surface portion S ₁₂ on the rear stage side over the first rake surface portion S ₁₁ on the front stage side. since 1 scoop sum of the length L ₁₁ and length L ₁₂ of the second-stage first rake face S ₁₂ of surface S ₁₁ is longer than the length L _S of the first rake face S ₁ of the prior art, the second rake face S The inducing force of the chip t to the ₂ side becomes weaker than that of the conventional first rake face S ₁ , and the cutting resistance becomes small.

As described above, the chips t of the soft material cut out on the front side first rake surface portion S ₁₁ strongly move to the rear side first rake surface portion S ₁₂ , but the length of the front side first rake surface portion S ₁₁ is large. Since the sum of L ₁₁ and the length L ₁₂ of the rear side first rake face portion S ₁₂ is longer than the length L _S of the conventional first rake face S ₁ , the flow is effectively corrected and the second rake face S ₂ The chip t guided to the side lightly hits the second rake face S ₂ ,
As shown in FIG. 1, the curl is spirally wound along the back portion 6b of the blade chamber 6 and has a sufficient gap between the curled portions as in the case of the hard work material W having a relatively large diameter. Such an ideal spiral chip t is obtained. Therefore, in such a cutting state, the cutting resistance is small, the cutting heat does not rise, and the cutting edge is not damaged, so that the saw life can be extended and the cutting accuracy can be maintained well.

As explained above, the circular saw of the present invention is
Whether used for hard or soft work materials, ideal or near-ideal spiral chips t
Since the cutting force does not increase, cutting heat does not rise, damage to the cutting edge is small, and the life of the saw can be extended, and the difference in cutting ability between hard and soft materials Can be reduced. In this way, one circular saw can be used for both a hard work material and a soft work material, so that it is extremely economical and can reduce equipment costs.

[0024]

According to the circular saw of the first aspect of the present invention, the first rake surface of each cemented carbide tip is adjacent to the front side first rake surface portion adjacent to the flank surface and the second rake surface. Since it is composed of the first rake face on the rear stage side, one circular saw can be used effectively for both hard and soft work materials, making it economical and cost effective. Can be reduced.

As in the circular saw according to the second aspect of the invention, the rake angle of the first rake face on the front side is approximately -20 ° to -30.
°, the length is approximately 0.15 mm to 0.25 mm,
Also, the rake angle of the rear side first rake face is approximately -10 °
-15 °, its length is approximately 0.15mm-0.25mm
And then, the sum of the length L ₁₂ of the front side length of the first rake face S ₁₁ L ₁₁ and the rear stage side first rake face S ₁₂ is 0.2~0.5m
By making it larger than m, cutting can be performed more effectively.

[Brief description of drawings]

FIG. 1 is an enlarged front view showing a part of a circular saw with a cemented carbide tip according to the present invention and explaining a cutting situation of a work material with the cemented carbide tip.

FIG. 2 is an enlarged detail view showing an enlarged part of a cemented carbide tip of the circular saw.

FIG. 3 is an enlarged front view showing a part of a conventional circular saw.

FIG. 4A and FIG. 4B are explanatory views for explaining a cutting situation of a work material by a conventional circular saw.

[Explanation of symbols]

1 Circular Saw Body 2 Blade Part 3 Carbide Tip 4 Relief Surface 6 Blade Chamber 7 Front Side Side of Carbide Tip S ₁ First Rake Surface S ₁₁ Front Side 1st Rake Surface Section S ₁₂ Rear Side 1st Rake Surface Section ₂ 2 Rake face W Work material

Claims (2)

[Claims] 1. A cemented carbide tip 3 is fixed to each blade portion 2 formed on the outer peripheral edge portion of a circular saw body 1, and each cemented carbide tip 3 is adjacent to a front end edge of a flank 4 rake face S ₁ is formed, a circular saw second rake face S ₂ on the front side of the hard tip 3 adjacent to the first rake face S ₁ is formed by forming a first rake face S ₁ Is a front saw side first rake face portion S ₁₁ adjacent to the flank 4 side and a rear stage side first rake face portion S ₁₂ adjacent to the second rake face S ₂ . 2. The front side first rake face portion S₁₁Rake angle γ
₁₁Is approximately -20 to -30 °, and its length L₁₁Is about 0.1
5 to 0.25 mm, the first rake surface S on the rear stage side ₁₂Scoop
Angle γ₁₂Is approximately -10 to -15 ° and its length L₁₂Is almost
0.15-0.25 mm, 1st rake face part S on the preceding stage side₁₁of
Length L₁₁And the rear side first rake face S₁₂Length L₁₂Sum of
Is larger than 0.2 to 0.5 mm.
The circular saw according to item 1.