JP3197520B2 - Diamond tip saw - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip saw used for cutting various materials such as wood and difficult-to-cut materials, and more particularly to a diamond chip formed of a diamond sintered body on the outer periphery of a disk-shaped main body. And a hard tip made of a hard material as described above. In addition, the diamond sintered body here refers to a material in which a polycrystalline diamond layer is formed on a support member such as a cemented carbide.

[0002]

2. Description of the Related Art Wood-based boards such as particle boards and MDF, ceramic boards such as siding boards, and F boards.
Composite materials such as RP, all of which are generally called difficult-to-cut materials. When cutting these difficult-to-cut materials using a tip saw, the wear on the cutting edge of the tip saw usually remarkably progresses. For this reason, the life of the tool is extended by using a tip made of a material having high wear resistance and fixing it to the cutting edge of the tip saw. A diamond tip is most suitable as a tip made of a material having high wear resistance. However, it is difficult to entirely replace the tip saw with diamond tips because diamonds are expensive.

[0003] Therefore, it is conceivable to reduce the number of blades arranged on the outer periphery of the disk as a tip saw and to dispose only the blades provided with diamond tips, but in this case, the interval between the tip edges becomes too large, and the work material is cut off. As shown in FIGS. 6 (a) and 6 (b), there is a state in which the chip 12 does not exist at all in the cut groove 10a as a slit-shaped cut portion formed when the work material 10 is cut as shown in FIGS. It occurs instantaneously. When this state is reached, the grinding groove 10a
There are no chips in contact with the left and right groove walls or groove bottom.
Therefore, the width of the groove 10a is the same in principle as the blade thickness of the tip saw, but the thickness of the disk portion of the tip saw base 11 is smaller than the blade thickness, and the width of the groove 10a and the tip saw base There is a gap with the 11 disk part, and there is no part in contact with the groove bottom, so the tip saw itself easily swings from side to side,
The quality of the cut surface of the work material 10 deteriorates. The meaning of the blade thickness follows the definition of JIS B4805. Further, in the present specification, the blade width indicates a dimension in the blade thickness direction of the insert when viewed from the front, and the dimension is not necessarily the same if the position in the radial direction changes.

In order to solve this drawback, a run-out is prevented as much as possible by using a hard tip made of a hard material which is less expensive than diamond, in combination with a diamond tip, without reducing the number of blades. .
Hard materials include cemented carbide, cermet, ceramic,
Tool steel, stellite, etc. are conceivable. In a conventional diamond tip saw in which a hard tip made of these hard materials and a diamond tip are mixed, the shape of the cutting edge of the hard tip and the shape of the cutting edge of the diamond tip are the same, and the maximum blade width is the blade thickness in a front view. The cutting radius was the same as or close to this.

[0005]

In the diamond tip saw described in the prior art, the shape of the cutting edge of the hard tip is the same as the shape of the cutting edge of the diamond tip, and the cutting radius is also the same. And the same cutting action is performed. Therefore, the cutting edge of the hard tip wears faster than the cutting edge of the diamond tip. When a difficult-to-cut material is cut, the wear rate is further increased.

As the wear of the hard tip progresses, the cutting edge retreats and the cutting radius becomes smaller, so that the work material cannot be cut. As a result, the cutting is performed only with the diamond tip, and the hard tip is brought into a state in which the diamond tip merely makes strong contact with the work material and rubs at the place where the diamond tip has cut.

[0007] Since the hard tip is worn from the same shape as the diamond tip, the hard tip comes into contact with the work material and rubs over the entire cutting edge portion, so that the frictional resistance is extremely large, and the cutting power of the entire tip saw is extremely large. Had the problem of becoming In addition, the generation of heat due to friction also increases, and there is a problem that the work material and the tip saw may be adversely affected.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to cut a difficult-to-cut material in a diamond tip saw in which a diamond tip and a hard tip are mixed. However, the object of the present invention is to provide a diamond tip saw having a small frictional resistance with a work material against wear of a hard tip.

[0009]

According to a first aspect of the present invention, there is provided a diamond tip saw having a diamond flat plate having a straight flat blade at a plurality of locations on an outer periphery of a disk-shaped base metal. The blade with the diamond tip made of the body is placed, and the shape of the tip made of hard material is set at an arbitrary position between the blades with the diamond tip and the maximum blade width equal to or close to the blade thickness in front view. A diamond tip saw in which a blade body provided with a hard tip is provided, wherein the shape of the hard tip forms a bilaterally symmetric shape in which a blade thickness center position of a blade edge protrudes in an equilateral mountain shape, and the hard tip at the blade thickness center position. Set the cutting radius to -0.1mm to + 0.1mm with respect to the cutting radius of the diamond tip at the same position. It is obtained by sequentially from lower radius.

According to the above-mentioned diamond tip saw, the shape of the cutting edge of the hard tip (shape in front view) is made different from the shape of the cutting edge of the diamond tip, and the cutting edge portion is formed in a mountain shape, so that the wear of the hard tip does not progress. At the beginning of cutting, the tip of the chevron passes through the center of the bottom of the grinding groove while cutting a narrower groove, so the overall cutting power is lower than that of a conventional diamond tip saw mixed with hard tips, Good stability against shaking. In addition, while the hard tip is in contact with the left and right groove walls and the groove bottom of the sawing groove, the cutting edge of the hard tip that is worn by the work material has a small area, and the friction resistance with the work material does not increase However, it does not lead to an increase in cutting power. Therefore, heat generation due to friction is small, and does not adversely affect the work material and the tip saw. Therefore, it is possible to continue cutting while keeping the cut surface of the work material in a good state.

Further, in the diamond tip saw according to the present invention, the blade width of the hard tip at a radius position 0.1 mm smaller than the cutting radius of the diamond tip at the center position of the blade thickness is 0 to the blade thickness dimension. This is 1/3. The diamond tip saw of the present invention described in claim 3 is one in which the tip of the hard tip is formed flat at a cutting radius position smaller than the cutting radius of the diamond tip at the center position of the blade thickness by 0.1 mm. It is. According to the diamond tip saw of these claims, the operation described in claim 1 can be obtained more reliably.

According to a fourth aspect of the present invention, there is provided a diamond tip saw comprising, as diamond tips, a diamond tip right for right cutting of a work material and a diamond tip left for left cutting of a work material, These two types of diamond tips and hard tips are appropriately arranged on a blade body. According to the diamond tip saw described above, the diamond tip saw, which is actually greatly involved in cutting, is divided into a right-hand cutting and a left-hand cutting of a work material, so that the cutting resistance as a whole is reduced, for example, for a power tool handled by hand. In this case, the burden on the worker is reduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial side view of a diamond tip saw according to the present invention, in which a blade 1a for tip attachment is disposed at a plurality of locations around the entire circumference of a disk-shaped base 1. The blade 1a is provided with a blade to which a diamond chip 2 is brazed. The blades are usually at equal intervals, but may be at irregular intervals. Hard tips 3 are arranged on the plurality of blades 1a existing between the blades of the two diamond tips 2, respectively.

FIG. 2A is a view taken along the line AA of FIG. 1, and a diamond tip 2 having a blade width equal to the blade thickness of the base metal 1 larger than the plate thickness is attached. The diamond tip 2 has a trapezoidal hoe shape formed by both ends 2a, 2b in the blade width direction on the tip side and both ends 2c, 2d in the blade width direction on the center side of the base metal 1, and has a straight flat blade between the tips 2a, 2b. And the maximum blade width dimension between 2a and 2b is the same as the blade thickness T.

FIG. 2B is a view taken along the line BB of FIG. 1, and a hard tip 3 having a blade width larger than the plate thickness of the base metal 1 is attached. The hard tip 3 has a symmetrical pentagonal shape with a tip 3a protruding in an equilateral mountain shape in the blade width direction, both ends 3b and 3c on the center side of the base metal 1 and both ends 3d and 3e protruding at an intermediate portion. The gap has a blade width equal to or close to the blade thickness T.

In the unused state of the diamond tip saw, the edge 2a, 2b of the diamond tip 2 has a substantially blade-like position 3a at the center of the blade width, which is the angled tip of the hard tip 3, with respect to the flat blade-like position. It is located in the range of −0.1 mm to +0.1 mm in difference in cutting radius. Therefore, from the straight flat blade shape of the diamond tip 2 and FIG. 1, the cutting edge is lowered as going to both sides from the chevron tip at the center position of the blade thickness of the hard tip, and the cutting radius of the hard tip is sequentially larger than the cutting radius of the diamond tip at the same position. Lower.

Further, as shown in FIGS. 3 (a) and 3 (b), the diamond tip 32 and the hard tip 33 have side cutting edges 32a, 32c, 32b, 32d and 33d, 33b,
It is also possible to reduce the cutting resistance by shortening 33e and 33c as compared with the shapes shown in phantom lines in FIGS.

In each of the embodiments, corners are formed at both ends of the cutting edge and at the tip of the chevron.
A chamfer or a round chamfer may be provided. Thereby, chipping of the corner can be prevented.

[Experimental Results] An experiment was conducted in which the tip of the hard tip 3 was variously deformed and the mounting position was changed to cut a ceramic board as a work material. As a result, the sharp tip of the cutting edge of the hard tip 3 located immediately before the diamond tip 2 wears the most, but the value varies depending on the shape of the hard tip and the cutting conditions, but the cutting radius of the diamond tip at the center of the blade thickness is varied. 0.05-0.1mm
It was found that when the cutting radius became small, the progress of wear was slowed down, and the difference in cutting radius from the diamond tip became substantially equilibrium.

Although the cutting edge width of the hard tip gradually increases from the sharp state due to the reduction of the cutting radius, the cutting force does not change significantly until the cutting edge width reaches T / 3 in many cases. It turned out that it was not noticeable because it stayed within the fluctuation range of the measured value and was hidden.
On the other hand, when the cutting edge width is increased beyond T / 3 due to a change in cutting conditions or the like, the result is that the cutting resistance is greatly increased and becomes noticeable.

Therefore, the shape of the hard tip 3 in the blade width direction should be such that the blade width of the hard tip at a radius 0.1 mm smaller than the cutting radius of the diamond tip at the center of the blade thickness exceeds を of the blade thickness dimension. It is desirable not to do so. The increase in the cutting resistance was determined by measuring the cutting power value.

Generally, the wear of the cutting edge of the hard tip 3 progresses to a point where the cutting edge becomes smaller by about 0.1 mm from the cutting edge position of the diamond tip 2. Then, the mounting position of the hard tip 3 was sequentially changed, and the position of the peak 3a of the hard tip 3 was lowered and cutting was repeated. When the blade width of the hard tip 3 was set to 1/4 of the blade thickness, it was found that the cutting resistance did not increase almost certainly even when the cutting edge of the hard tip 3 was worn. For this reason, the angled tip of the hard tip 3 usually has a pointed shape. However, when the width is given, the blade width of the hard tip is preferably set at a radius smaller than the cutting radius of the diamond tip by 0.1 mm, and more preferably the blade thickness. It is considered that good cutting can be performed if the thickness does not exceed 1/4 of T.

That is, even if the mounting position of the hard tip 3 is lowered in the cutting radius direction thereafter, no change occurs in the cutting resistance due to abrasion.
When a is set to a position smaller than the cutting edge position of the diamond tip 3 by 0.1 mm in the cutting radius direction, the cutting edge of the hard tip 3 hardly wears. At this time, the hard tip 3 hardly participates in the cutting, but only acts to prevent the lateral running of the entire tip saw during the cutting.

[Consideration] Since it is difficult to actually observe the state of the cutting edge during cutting, one example is shown as an explanatory diagram based on the above experimental results in FIG.
And will be discussed.

At the outer periphery of the main body of a diamond tip saw body having a diameter of 110 mm, 24 blades for mounting tips are provided at equal intervals, of which diamond tips are fixed at three locations at equal intervals, and the remaining seven locations are 21 in total. A hard tip shall be attached at each location. Rotation speed of tip saw body is 1
If the rotation speed of the work material 5 is 2000 rpm and the feed speed of the work material 5 is 5 m / min, the advance amount fz of the work material 5 moving from the passage of the first edge of the diamond chip to the passage of the second blade is fz = work Feeding speed of material / (number of rotation of tip saw × number of diamond tip blades) = 5000 / (12000 × 3) =
0.14 mm.

The trajectory of the workpiece 5 through which the tip of the first diamond tip blade passes is denoted by A, and the trajectory of the second tip of the diamond tip passing through workpiece B is denoted by B. Of these two trajectories, the point at which the first diamond tip blade starts to cut the workpiece 5 is 5a, the point at which the cutting is completed is 5b, the point at which the second diamond chip starts to cut the workpiece 5 is 5c, and the point at which the cutting is completed. Is set to 5d.

Seven hard chips provided between the blades of the two diamond chips pass through the canvas-like portion surrounded by the 5a, 5b, 5c, and 5d and are cut. For the hard tip passing immediately after the diamond tip first blade, the advance amount of the work material 5 is 0.14 mm ÷ 8.
= 0.0175 mm, which means that the work material is cut with a slight projection of 0.0175 mm at the tip of the angle of the hard tip.

However, as the hard tip is farther from the first edge of the diamond tip, cutting is performed on the slope of the mountain in the same state that the tip of the mountain is more protruded, so that a larger cutting force is sequentially received. Therefore, the hard tip immediately in front of the diamond tip second blade projects the tip portion most greatly and performs cutting on the slope of the mountain, and receives the greatest cutting force, and therefore wears the most.

The following condition is further added to such a state. That is, it is considered that each of the tip saws has sharp sharpness immediately before the start of use, and cuts the inside of the canvas-like portions 5a, 5b, 5c, and 5d of the work material 5 without leaving uncut portions. However, when a certain time elapses after the start of use, wear of the hard tip gradually progresses. And when the wear of each hard tip increases, uncut portions will be generated when cutting with each hard tip, and the hard chips involved in cutting later will cut extra uncut portions with earlier hard chips. You have to do it. Therefore, wear is further promoted.

In the above example, the feed amount of the work material 5 for one blade of the diamond tip is 0.14 mm, which is the amount in the moving direction in which the work material 5 is fed. When this amount in the moving direction is converted into the dimension tm in the cutting radius direction of each chip, the thickness becomes approximately half in the substantially middle part of the plate thickness of the work material 5 due to the general cutting position between the work material and the chip saw. Therefore, tm = fz / 2 = 0.14 / 2 = 0.07 mm. That is, in this example, it is considered that when the hard tip is worn by 0.07 mm, the progress of the wear is slowed down, and the difference in radius from the diamond tip becomes substantially equilibrium.

[Other Embodiments] FIG. 5 shows another embodiment, in which the diamond chip shown in the above description is divided into two types and a cutting groove is cut in a work material. Is divided into a diamond chip left 6 for cutting the left half of the groove and a diamond chip right 7 for cutting the right half of the groove. The two types of diamond tips 6 and 7 are alternately fixed to a tip mounting blade 1a of the disk-shaped main body 1.

FIG. 5 (b) is a CC view of FIG. 5 (a), showing the diamond chip left 6, between the left tip 6a and the most protruding point 6d at the right center. Has the maximum blade width T1, and has a deformed pentagonal shape that is bent at the center position 6e at the tip end.

FIG. 5C is a DD view of FIG. 5A and shows the diamond chip right 7, in which the distance between the right tip 7d and the leftmost center point 7a most protruding is shown. It has a maximum blade width T1, and has a deformed pentagonal shape that is bent at the tip center position 7e. The gap between the left tip 6a and the right tip 7d that appears when the diamond tip right 7 is superimposed on the diamond tip left 6 is the blade thickness T.

FIG. 5D is a view taken along the line EE of FIG. 5A and shows the hard chip 63. The tip of the hard tip 63, which protrudes in a chevron shape in the blade width direction, is cut off from the top point 63a, and the cutting radius at this position is 0.1 mm smaller than the cutting radius at the center of the blade thickness of the left and right diamond tips 6 and 7. , Are formed in a flat shape. Other parts are the same as those in FIG.

[0035]

Since the diamond tip saw of the present invention has the above-described structure, the following effects can be obtained. According to the first aspect of the present invention, since the shape of the hard tip in the blade width direction is a shape having a mountain-shaped cutting edge, the cutting edge portion has a small area when worn by cutting, and the frictional resistance with the work material is large. In addition, the cutting power does not increase. Therefore, heat generation due to friction is small and does not adversely affect the work material and the tip saw. Furthermore, since the cutting edge angle of the hard tip is symmetrical, there is no component of cutting resistance or frictional resistance that acts directionally to the right or left at the time of cutting, so that the tip saw does not run out.

The inventions of claims 2 and 3 can more reliably execute the effects of the invention of claim 1.

According to the fourth aspect of the present invention, the diamond tip is fixed to the tip saw body separately for the left side cutting and the right side cutting of the workpiece, so that the cutting resistance is reduced as a whole, and The relative feed is lightened, and for example, in the case of a power tool handled by hand, workability is improved.

[Brief description of the drawings]

FIG. 1 is a partial side view of a diamond tip saw.

FIGS. 2A and 2B are front views in the blade width direction of the insert, where FIG. 2A is a view along AA in FIG. 1 and FIG. 2B is a view along BB in FIG.

FIGS. 3A and 3B are modified views of the chip, wherein FIG. 3A is a diamond chip and FIG. 3B is a hard chip.

FIG. 4 is an explanatory diagram showing a cutting state.

FIGS. 5A and 5B are views showing another embodiment, in which FIG. 5A is a partial side view of a diamond tip saw, FIG. 5B is a CC view of FIG. 5A, and FIG. 5C is a DD view of FIG. (D) E in (a)
-E view, (e) is FF view of (d).

6A and 6B are views showing a conventional technique, in which FIG. 6A is a partial side view showing a relationship between a tip saw and a work material, and FIG.
FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tip saw base metal 1a Tip mounting blade body 2 Diamond tip 3 Hard tip 5 Work material 6 Diamond tip left 7 Diamond tip right

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-148613 (JP, A) JP-A-8-155733 (JP, A) JP-A-8-309702 (JP, A) 15224 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B23D 61/04 B27B 33/08

Claims (4)

(57) [Claims] 1. A blade having a diamond tip made of a diamond sintered body having a straight flat blade at its tip is disposed at a plurality of positions on the outer periphery of a disk-shaped base metal. A diamond tip saw in which a hard tip having a hard tip having a maximum blade width equal to or close to the blade thickness in a front view is arranged at a position, and the shape of the hard tip is a blade edge. The thickness center position has a symmetrical shape protruding in an equilateral mountain shape, and the cutting radius of the hard tip at the blade thickness center position is -0.1 mm to +0.
A diamond tip saw characterized in that the cutting radii on both sides of the chevron tip at the center position of the blade thickness are sequentially lower than the cutting radius of the diamond tip. 2. The diamond according to claim 1, wherein the blade width of the hard tip at a radius position 0.1 mm smaller than the cutting radius of the diamond tip at the center position of the blade thickness is 0 to 1/3 of the blade thickness dimension. Tip saw. 3. The diamond tip saw according to claim 1, wherein the angled tip of the hard tip is formed flat at a cutting radius position 0.1 mm smaller than the cutting radius of the diamond tip at the center position of the blade thickness. 4. A diamond tip is formed by a diamond tip right for cutting a work material on the right side and a diamond tip left for cutting a work material on the left side, and the two kinds of diamond tips and the hard tip are used as a blade. Claim 1 appropriately arranged
The diamond tip saw according to 1.