JP2002347005A - Carbide tipped saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that in a hollow face type carbide tipped saw, a grinding length of a rake face is long, a grindstone can not be sent out to a tooth room side, grinding time is required, a biassed wear is generated in the grinding stone, a life of the grinding stone becomes short and cost is increased. SOLUTION: In the carbide tipped saw wherein the tip on which a recess is formed is fixed to a center in a tooth width W direction of a rake face in order to form a lateral rake angle of an angle θ equal to those of left and right side face cutting edges by seeing the tip of the tooth width W in a parallel direction of rake surface from a peripheral rake surface side, the rake surface has at least two rake surfaces of a first rake surface and a second rake surface. The saw contains the tip having the recess in both of the first rake surface and the second rake surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to wood, wood board,
The present invention relates to an improvement in a chip saw for cutting and grooving various materials such as synthetic resin, metal, or a composite material thereof, and having a hollow face type tip which is joined to each tooth body by brazing or the like.

[0002]

2. Description of the Related Art In a chip saw, chips are fixed at equal or unequal pitches on an outer peripheral portion of a disk-shaped base metal, and are ground into a predetermined cutting edge shape as a chip saw. Various cutting edge shapes of tip saws have been proposed from the viewpoints of generation of burrs, welding of cutting chips to cutting surfaces, prevention of cutting edge breakage due to interrupted cutting, extension of tool life, improvement of machining surface roughness, and the like. . Among these shapes, a tip saw having a hollow face type tip is used for cutting wood, wood board and the like.

[0003] A hollow face type cutting blade is a bilaterally symmetrical recess in the rake face when the tip is viewed from the outer peripheral flank side in a direction parallel to the rake face, and the tooth shape of the tip is substantially circular. It is formed so that the lateral rake angles of equal size are formed on the left and right.

In forming a hollow (hollow) 12d on the rake face 12a of the tip 12 of the hollow face type chip saw 11, a method shown in FIG. 5 has conventionally been used. That is, the main bonding surface 1 which is the main brazing surface on the back surface of the chip 12
The outer peripheral surface of a grindstone 14 with a shaft 13 whose radius is the same as the radius of the finished dent 12d is brought into contact with the rake face 12a substantially parallel to 2c, and the finished dent is ground by the grindstone 14.

[0005]

However, if the grindstone 14 is not sufficiently pushed into the tooth chamber 11a in the direction of the arrow A, uneven wear occurs, and accurate grinding cannot be performed. Therefore,
In order to grind the entire rake face 12a without uneven wear of the grindstone 14, it is necessary to prepare a large number of specified grindstones and replace them before the wear, which is expensive. Alternatively, it is necessary to use the entire outer peripheral surface of the grindstone evenly, and the grinding wheel 14 with the shaft is considerably pushed in the arrow A direction on the tooth chamber 11a side so that the grindstone width is used as uniformly as possible. Was. The depth of the tooth chamber 11a of the tip saw changes depending on the diameter and the number of teeth of the tip saw used. However, since the depth of the tooth chamber 11a is not so large as compared with the length (grinding wheel length) L and the diameter R of the grinding portion of the grinding wheel 14 with a shaft, the outer peripheral portion on the leading end side of the grinding wheel 14 with a shaft at the cut end. May hit the tooth bottom 11b, and there is a problem that it takes time to prepare for adjustment of mechanical movement (movement of the whetstone with shaft in the direction of arrow A) before grinding. Alternatively, it is necessary to make the tooth chamber 11a considerably large, and there is a problem in that the strength of the circular saw is reduced, and idle noise and cutting noise are increased.

In addition, since the front face of the rake face 12a is ground from the flat surface to the recess 12d to a predetermined depth, there is a problem that a considerable amount of grinding time is required. The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to reduce the grinding allowance by the grinding length and depression of the first rake face and reduce the rake face in a short time. It is an object of the present invention to provide a chip saw that can reduce the working cost by forming a grinding wheel, and extend the life of the grinding wheel by using the entire width of the grinding wheel uniformly.

[0007]

In order to achieve the above object, the invention of claim 1 of the present application is directed to a case where a chip having a tooth width W is viewed from an outer peripheral flank side in a direction parallel to a rake face, and is provided with left and right side cutting edges. A chip saw to which a chip having a recess formed in the center of the face width W direction of a rake face is fixed so as to form a lateral rake angle of an equal angle θ, wherein the rake face is a first rake face and a second rake face from the outer peripheral side. Has at least two rake faces,
Both the first rake face and the second rake face include a chip provided with a depression. Also, the rake angle direction of the second rake face is substantially parallel to the main joint face.

According to the present invention, the adjustment time and the grinding time of the movement range of the grinding wheel for manufacturing a tip saw having a hollow face type tip can be reduced, and the wear of the grinding wheel can be reduced to extend the life of the grinding wheel. The cost of the tip saw can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view showing a hollow face type chip of the present invention, which will be described based on a front view a, a plan view b, and a side view c viewed from the first rake face side.

The sintered chip 1 has a main joining surface 1a on the back surface.
And the sub-joining surface 1b on the bottom surface, which is substantially perpendicular to this, is joined to the pedestals 2a and 2b of the tip saw 2 by brazing or the like. A second rake face 1c having a concave arc substantially parallel to the main joining face 1a is formed on the front surface of the chip 1, and the bottom face 1 of the second rake face is formed.
An inclined flank 1d is formed on the b side, and a concave rake face 1e is formed on the tip side. Then, an outer peripheral flank 1f is provided rearward from the first rake face 1e toward the main joint face 1a.
Are formed. 1st rake face 1 on outer peripheral flank 1f
1g chamfered at both corners of the tooth width W from the tip of the outer peripheral cutting edge e.
Are formed.

The first rake face 1e has the side cutting edges 1h, 1h from the chamfered position in this embodiment of 0.2 mm to 3.0 mm.
The first rake face 1e of the concave arc is formed at an angle of α = 3 ° to 15 ° with respect to the second rake face 1c. By forming the first rake face 1e at this angle, the tip 1 is placed on the first rake face 1e with respect to the diameter line of the tip saw when the main joining face 1a is brazed to the pedestal 2a for brazing the tip saw 2. A first rake angle β between 0 ° and 25 ° is formed.

The reason why the length of the side cutting edge in the state where the chip is finished is determined to be 0.2 mm to 3.0 mm is as follows.
If it is less than 0.2 mm, the length of the side cutting edge is too short and the intended purpose of cutting cannot be achieved. On the other hand, if the length is too long, the length of the first rake face becomes long, and it is difficult to solve the conventional problems.

The first rake face 1e is formed in a concave arc having a radius R so as to form a lateral rake angle θ substantially equal to the left and right as viewed from a direction parallel to the first rake face 1e. ing. The second rake face 1c is also formed in a concave arc having substantially the same radius R, and the feature of the present invention is that it has at least a first rake face and a second rake face, each of which is formed by a concave arc. is there. Further, on both side surfaces of the chip 1, flank surfaces 1j, 1j having a side surface eccentric angle γ toward the center of the chip and a side clearance angle δ toward the rear in the cutting direction are formed.

In order to manufacture a chip saw having such a chip shape, first, a predetermined grinding allowance is added to the outer peripheral flank 1f and the both-side flank 1j, 1c with cemented carbide powder such as cemented carbide. A mold in which the second rake face extending to the first rake face is a concave arc having a substantially radius R is filled, and heated and pressed to a required temperature to produce a sintered molded chip material shown in FIG. Then, the main joint surface 1a and the sub joint surface 1b of the chip are brazed to the brazing pedestals 2a and 2b of the chip saw 2, respectively.

An example of a procedure for chip brazing thus brazed will be described. Attach the tip saw 2 to a jig that can index each tooth and fix it on the table of the grinding machine,
Each chip is sequentially indexed with a grindstone used in a conventionally known grinding method so that the side clearance angle δ and the side center angle γ of the chip 1 are formed, and both side surfaces are ground so that the respective tooth widths become W. Process. Next, as shown in FIG. 3, the axis of the grinding wheel 14 having the radius R with the shaft 13 is shifted forward by an angle α = 3 ° to 15 ° with respect to the second rake face 1 c of the indexed chip 1.
To setting.

Then, the grindstone shaft 13 is fed in the direction of arrow A at the center of the tooth width W of the tip so that a substantially equal rake angle θ is formed on both sides from the outer peripheral flank 1f side to form a concave arc of radius R. One rake face 1e is cut and each chip 1 is sequentially indexed to form side cutting edges 1h, 1h having a lateral rake angle θ. The first rake face 1e thus formed is formed at the front end of the second rake face so as to be inclined at an angle α = 3 ° to 15 ° forward with respect to the second rake face 1c. Since the grindstone 14 grinds only the tip portion of the second rake face 1c as shown in FIG. 3 and grinds it in a direction away from the second rake face, the grindstone is ground at the bottom of the tooth chamber 2d after the first rake face is ground. It can be sent out to the tooth chamber 2d without contacting the tooth chamber 2c. Therefore, grinding is performed uniformly over the entire surface of the grindstone, and uneven wear of the grindstone does not occur.

Next, each chip 1 is sequentially indexed, the outer peripheral flank 1f is ground, and both lateral chamfers 1g, 1g of the outer peripheral flank are ground, and the side cutting edges 1h, 1h are chamfered 1g, 1g. It is formed to a length of 0.2 mm to 3.0 mm from the position and is finally finished. The other surface than the above-mentioned grinding is not particularly processed while being formed at the time of sintering. Further, in order to prevent chipping of the left and right corners at the tip of the first rake face 1e, chamfering is performed on both sides of the outer peripheral flank as necessary. Is also good. Further, the chamfering of the corner is not always performed, and the chamfering may not be performed in some cases. The dimensions and angles of each part are not limited to those described above, but can be changed as needed.

Further, after grinding both side surfaces to the side clearance angle δ and the side surface center angle γ, the concave arc of radius R of the first rake face 1 e is fed in the axial direction of the grinding wheel while rotating the grinding wheel 14 of radius R. Te by passing, has formed the lateral rake angle θ substantially equal to the left and right, using the grindstone radius R smaller radius R ₁ as shown in FIG. 4, mainly in the direction of arrow C is positioned in O ₁ The grindstone is rotated and fed in the grindstone axis direction, and a side rake angle of θ is formed on one side cutting edge 1h by upward grinding. Then, the center of the grindstone is positioned at O ₂ , the grindstone is rotated in the direction of arrow D, and is sent out in the grindstone axis direction, and it is also possible to form a horizontal rake angle of the same angle θ on the other side cutting edge 1h by upward grinding. is there. Further, it is also possible to form a horizontal rake angle by downward grinding with the grinding wheel rotation being in the opposite direction.

By grinding in this way, there is no difference in the finished condition of the side cutting blade, and the cut surface becomes uniform. The upward grinding refers to grinding in a state in which the working surface of the grindstone moves inward (on the rake face side) of the cutting blade. Furthermore, the tip of the tip saw of the present invention does not need to be applied to all the teeth of the tip saw, and can be freely combined with other known teeth to form the tip saw.

[0020]

As described above, the present invention has the following advantages. Since the first rake face and the second rake face are rake faces having concave arc-shaped depressions, the first rake face can be formed by grinding only the tip portion of the second rake face, and the grinding amount of the grindstone can be reduced. The plunge of the whetstone with a shaft can be reduced. In particular, by grinding only the first rake face inclined at the front face of the second rake face,
The cutting blades required for processing can be formed, and the grindstone can be fed out in the axial direction without increasing the size of the tooth chamber, and the life of the grindstone is extended by uniformly using the whole grindstone. Further, the grinding allowance can be reduced, the grinding time can be shortened, and the cost can be reduced. Further, since the size of the tooth chamber does not need to be particularly large, the total number of teeth can be increased.

[Brief description of the drawings]

FIG. 1 is a view showing a chip to be brazed to a chip saw of the present invention, wherein a is a front view seen from a first rake face side, b is a plan view, and c is a side view.

FIGS. 2A and 2B are diagrams showing a first rake face, an outer peripheral flank, an outer peripheral chamfer, and both side faces of the sintered compact of the chip before grinding, wherein a is a front view, b is a plan view, and c is a side view.

FIG. 3 is a diagram showing a state in which a first rake face of a chip joined to a chip saw is ground.

FIG. 4 is a view showing a state in which a first rake face of a chip is ground by a grindstone having a radius smaller than a radius of a concave arc of the rake face;

FIGS. 5A and 5B are grinding views of a rake face of a conventional hollow face type chip, in which a is a side view and b is a plan view.

[Explanation of symbols]

 Reference Signs List 1 chip 1a main joint surface 1b sub joint surface 1e first rake face 1c second rake face 1f outer flank 1j outer chamfer 2 tip saw 14 grinding stone θ side rake angle

Claims (2)

[Claims] 1. An angle θ substantially equal to the left and right side cutting blades when a chip having a tooth width W is viewed from a peripheral flank side in a direction parallel to the rake face.
A chip having a recess formed in the center of the rake face in the tooth width W direction to form a lateral rake angle, wherein the rake face is at least two of a first rake face and a second rake face from the outer peripheral side. A chip saw, comprising: a chip having a rake face, and a chip provided with a depression on each of the first rake face and the second rake face. 2. The tip saw according to claim 1, wherein a rake angle direction of the second rake face is substantially parallel to a main joint face.