JPH02292118A - Structure of metal bed for rotary saw - Google Patents

Abstract

PURPOSE:To prevent the roughness of pull skin and keep a chip life longer by forming a number of slits in a peripherally spaced manner at the outer periphery portion of a disc metal bed and forming channels extended to a radial direction between respective slits. CONSTITUTION:A sawtooth edge stock 12 is formed in a preset pitch at the outer periphery portion of a metal bed 11 for a rotary saw 10 and a chip 13 is fixed on the rotation side of the top of the edge stock 12. Five slits 14 which are extended to a radial direction from the through portion 12a of the edge stock 12 are formed in a peripherally equally-spaced manner. Two channels 15 which are extended to a radial direction are formed between respective slits 14. The outer ends 15a of the channels 15 are located at the outer periphery portion of the inner ends 14a of respective slits 14, and the inner ends 15b are located at the axial core portion of the inner ends 14a. The outer periphery portion of the metal bed 11 is thus split in a peripheral direction with respective slits 14, and the inner periphery portion of split outer periphery pieces are split in a peripheral direction with the channels 15, so that when the metal bed 11 is raised in temperature by heat due to cutting heat distortion in a peripheral direction is absorbed by the slits 14 and the channels 15.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotary saw for cutting stone, metal, wood, etc., and particularly relates to the structure of its base metal.

(Conventional technology) As a conventional technology, there was a structure shown in Fig. 5. In Fig. 5, reference numeral 1 is a rotary saw, in which a large number of serrated blade holders 3 are formed on the outer periphery of a disk-shaped base metal 2, and the rotating side of the top of the blade holder 3 is made of cemented carbide. Chip 4 is fixed. On the outer periphery of the base metal 2, four slits 5 are formed at equal intervals in the circumferential direction, extending in the axial direction from the trough 3a of the blade base 3, and each slit 5 has an elongated length in the radial direction in the middle part. Form hole 6. The elongated hole 6 has an outer end 6a located slightly more axially than the inner end 5a of the slit 5, and an inner end 6b thereof.
is located at the radially intermediate portion of the base metal 2, and the width of the outer end is wider than the width of the inner end. (Problems to be Solved by the Invention) In the conventional device described above, the circumferential interval between the slits 5 is large and the elongated hole 6 is located closer to the axis than the slit 5, so the slit separates the slit in the circumferential direction. The outer circumferential piece of the base metal 2 thus formed is wide in the radial direction and continues long in the circumferential direction. For this reason, when the temperature of the outer peripheral part of the base metal 2 increases due to long-term continuous cutting, etc., and this reaches, for example, 20 to 50 degrees, the internal strain of the outer peripheral part increases and becomes wavy in the thickness direction. The rotary saw 1 may be deformed, or the natural frequency of the base metal 2 may be significantly lower than the initial natural frequency and match the rotational frequency of the rotary saw 1, and the rotary saw 1 may be caused by vibration of its mounting flange, etc. The ground surface may become rough due to resonance with the excitation frequency, etc.
There was a drawback that the lifespan of chip 4 was shortened. In order to prevent the adverse effects caused by the temperature rise mentioned above, the slit 5
If the pitch of the slits 5 is made smaller or the slits 5 are made longer in the axial direction, the outer circumferential portion between each slit 5 will deviate in the thickness direction. This had the disadvantage that the bending rigidity decreased and the ground surface became rough, as mentioned above. The object of the present invention is to obtain a novel base metal structure for a rotary saw that eliminates the above-mentioned drawbacks. (Means for Solving the Problems) In order to achieve the above object, the present invention is constructed as follows. That is, a large number of slits extending in the axial direction from the outer peripheral end of the disc-shaped base metal are formed at intervals in the circumferential direction on the outer periphery of the base metal, and elongated holes extending in the radial direction are formed between each slit. The outer end of each elongated hole is located closer to the outer periphery than the inner end of each slit, and the inner end of each elongated hole is located closer to the axis than the inner end of each slit. It is effective that the phase angle in the circumferential direction between the slit and the elongated hole adjacent thereto is approximately 30 degrees at most. Further, the width of each long hole is preferably about 1 m at most. Further, it is preferable that the distance between the outer end of each elongated hole and the outer peripheral end of the base metal be at least about 5% of the radius of the base metal. Furthermore, the distance between the inner end of each elongated hole and the center of the base metal is preferably at least about 40% to 70% of the radius of the base metal. (Function) Since the present invention has the above configuration, the outer peripheral part of the base metal is divided in the circumferential direction by each slit, and the inner peripheral part of the divided outer peripheral piece is divided in the circumferential direction by the elongated hole. As a result, the outer peripheral portion of the base metal is wide in the radial direction and is not continuous for a long time in the circumferential direction.

When the temperature of the base metal rises due to cutting heat, thermal strain in the circumferential direction is absorbed by the slits and elongated holes in the outer peripheral portion of the base metal.

(Example) Embodiments of the present invention will be described below based on the drawings.

In the drawings, FIG. 1 is a side view of main parts showing a first embodiment of the present invention, FIG. 2 is a side view of main parts showing a second embodiment, and FIG. 3 is a side view of main parts showing a third embodiment. , Figure 4 is an experimental table showing the relationship between the type of base metal and vibration. In FIG. 1, 1o is a rotary saw, and a disk-shaped base metal 11
A tip 13 made of cemented carbide is fixed to the outer periphery of the tip. The base metal 11 has a diameter of 305 cm and a thickness of 2.05 l, for example.
Made of steel plate (SKS5) (7) Serrated blade bases 12 are formed at a predetermined pitch on the outer periphery, and a diameter of 2 mm is formed on the shaft center.
A mounting hole 11a of 5.4 mm is formed, and the above-mentioned tip 13 is fixed to the rotating side of the top of the blade stand 12. Five slits 14 extending from the valley l2a of the blade base 12 in the axial direction are formed at equal intervals in the circumferential direction on the outer periphery of the base metal 11. This slit 14 makes the distance L1 from the outer end of the rotary saw 10 to the inner end 14a of the slit 14 within about 30% of the radius of the rotary saw 10. Further, a long hole 1 extending in the radial direction between each of the slits 14 is provided.
Form two pieces of each 5. This elongated hole 15 has a circumferential phase angle α1 of 22.
5 degrees, and α2 is the phase angle in the circumferential direction between adjacent long holes 15.
7 degrees, and the outer end 15a of each elongated hole 15 is located closer to the outer periphery than the inner end 14a of each slit 14, and the inner end 15b of each elongated hole 15 is located closer to the axis than the inner end 14a. position.

Furthermore, each elongated hole 15 has an outer peripheral portion and an inner peripheral portion formed into a substantially S-shape that curves in opposite directions. The distance L2 between the outer end 15a of each elongated hole 15 and the outer peripheral end of the base metal 11, that is, the trough 12a of the blade base 12, is at least about 5% of the radius of the base metal 11, and the inner end 15b of each elongated hole 15 The distance L3 between the center portion of the base metal 11, that is, the inner peripheral surface of the mounting hole 11a, is at least about 40% to 70% of the radius of the base metal 11. Note that the distances 11iL2 and L3 are for maintaining the rigidity of the base metal 11 at a predetermined value or more. Furthermore, the width of each elongated hole 15 can be reduced by precision gas cutting or laser beam cutting to approximately 1 mm or less, for example, 0.2 mm.
It is formed to about 1+m. By making the width of each elongated hole less than 1 in this way, it is possible to reduce wind noise when the base metal 11 rotates. Figure 2 shows the second embodiment. This device differs in that the elongated hole 15 described above is made into an elongated hole 16 that extends in the radial direction and has the same width. That is, the circumferential phase angle α1 between the elongated hole l6 and the slit 14 adjacent thereto, the circumferential phase angle α2 between the adjacent elongated holes 16, and the valley between the outer end 16a of the elongated hole 16 and the blade rest 12. The distance L2 from the part 12a and the distance L3 between the inner end 15b of the elongated hole 15 and the inner peripheral surface of the mounting hole 11a of the base metal 11 are set to be the same as those in FIG. The overlapping state of the long holes 16 in the radial direction is also the same as that shown in FIG. 1 described above, and the rest has approximately the same structure as that shown in FIG. Figure 3 shows the third embodiment. In this case, eight slits 14 are formed in the base metal 11 at equal pitches in the circumferential direction, and the slits 14 extend in the radial direction at the intermediate part between each slit 14, and the outer end is wider than the inner end. It differs from the one shown in FIG. 2 in that one elliptical elongated hole 17 is formed, and the circumferential phase angle α3 between each slit 14 and each elongated hole 17 is all 22.5 degrees.
The remainder has approximately the same structure as that in Figure 2. Figure 4 is an experimental table showing the relationship between base metal type and vibration. In FIG. 4, A is the conventional base metal (FIG. 5), B-E is the base metal of the present invention, and B is each slit 14 and each elongated hole 15.
C
is an alloy with a temperature of 30 degrees, D is a base metal with a temperature of 25.7 degrees,
E is an alloy with a temperature of 22.5 degrees.

Each of the base metals A to E has a diameter of 305 m.
The thickness is 2.05 mm, and the diameter of the mounting flange that holds the base metal is 85 mm. Then, each of the above alloys A-E was heated at 3/min.
While rotating at 0,000 rpm, these were heated by a burner with a constant heating power, and in this state, the time until each of the base metals A to E generated vibration was measured. According to the above experimental results, as shown in Figure 4, A is 13 seconds (point a) and B is 3 seconds.
5 seconds (point b), C 67 seconds (point C), D 103 seconds (d
point) and E was 119 seconds (point e), indicating that the base metal C-E was in good condition. That is, the amount of distortion of the base metal 11 when the base metal is heated for 67 seconds or more with a burner is within the temperature increase limit of the base metal due to cutting (20°C to 5°C).
This is because the amount of strain exceeds the amount of strain (0°C).

Furthermore, if the circumferential phase angle between each slit 14 and each elongated hole 15 (16, 17) is smaller than 22.5 degrees,
It becomes difficult to maintain the rigidity of the base metal 11 at a predetermined value.

(Effects of the Invention) As is clear from the above description, the present invention includes forming a large number of slits in the circumferential direction extending from the outer peripheral end of the base metal in the axial direction,
Between each of these slits, a long hole is formed that extends in the radial direction from the outer periphery of the inner end to the inner periphery of the inner end, so the pitch of the slits is not made smaller than necessary. , the outer periphery of the base metal is essentially divided into many parts in the circumferential direction. Therefore, even if the temperature of the outer periphery of the base metal rises due to cutting, etc., the thermal expansion in the circumferential direction of this outer periphery can be efficiently absorbed by the slits and elongated holes to prevent the natural frequency of the outer periphery from decreasing. I can do it.

Therefore, the rotation of the rotary saw during cutting becomes quiet, the sawn surface becomes smooth, and the life of the tip is extended.

[Brief explanation of drawings]

FIG. 1 is a side view of main parts showing a first embodiment of the present invention, FIG. 2 is a side view of main parts showing a second embodiment, FIG. 3 is a side view of main parts showing a third embodiment, and FIG. The figure is an experimental table showing the relationship between the type of base metal and vibration, and FIG. 5 is a side view of the main part showing a conventional example. 10: rotating saw, 11: base metal, 11a: mounting hole, 12:
Blade base, 12a: valley, 13: tip, 14: slit,
14a: Inner end. 15 (16/17): Long hole, 15a:
Outer end, 15b: Inner end, α1/α2 (α3) biphasic angle Application agent Hisashi Matsumoto 1 Figure 3 Figure 2 Figure 5 Figure 5 Procedure amendment

Claims (1)

[Claims] 1. A large number of slits are formed at intervals in the circumferential direction on the outer periphery of a disc-shaped base metal, extending from the outer periphery end in the axial direction,
A long hole extending in the radial direction is formed between each slit, and the outer end of each long hole is located on the outer periphery of the inner end of each slit. A structure of a rotary saw base metal characterized by being located at the center of the shaft. 2. The structure of the rotary saw base metal according to claim 1, wherein the phase angle in the circumferential direction between the slit and the elongated hole adjacent thereto is approximately 30 degrees at most. 3. The structure of the base metal for a rotary saw according to claim 1 or 2, wherein the width of each long hole is approximately 1 mm at most. 4. Claim 1, characterized in that the distance between the outer end of each long hole and the outer peripheral end of the base metal is at least about 5% of the radius of the base metal.
The structure of the base metal for a rotary saw according to , 2 or 3. 5. The rotation according to claim 1, 2, 3, or 4, wherein the distance between the inner end of each long hole and the center of the base metal is at least about 40% to 70% of the radius of the base metal. Structure of saw base metal.