JPH08155733A - Tip saw for metal - Google Patents

Abstract

PURPOSE: To prevent a cutting surface from being bent due to the fatigue failure or damage of/to a cutter by making a part from the cutter part of the front of a cutter tip to both edges with sweepback angle into a side edge cutter. CONSTITUTION: A side edge cutter 4 is mounted over outside protruding edge 3' from a cutter protruding edge 3, sweeping back at an appropriate angle toward the outside protruding edge 3' from the cutter protruding edge 3. It is desirable that a sweepback angle over the outside protruding edge 3' from the cutter protruding edge 3 should be approximately 10-35 degree to the central surface of rotation, and the sweepback angle is proportional to the rotational speed of a saw cutter and viscosity, however, is inverse proportional to the hardness of a material to be cut. For any load on which the cutter acts, torsional moment acting on a cutter is compensated and cutting chips are divided into two, and discharged to the outside of the right and left of the cutter, so that little heat by a contact between the cutting chips and the cutting surface is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Industrial field of application: The present invention relates to a circular saw for cutting industrial products such as non-ferrous metals, metals and synthetic resins.

(2) Conventional technology: At present, the sharpest tip of the cutting edge of a metal tip saw is located at both ends (3) of the cutting edge [Fig. 4, (I
Most of them are installed in [V)]. This is the part of the cutting edge necessary to make the necessary cutting width for cutting the object to be cut, but since it cuts on either the left or right from the center of the saw Under the present circumstances, a bending moment acts, which causes breakage of the cutting edge, damage, and bending of the cutting surface due to the damage. The present invention cancels the bending moment generated at the time of cutting by applying the cutting force applied to the cutting edge at the time of cutting to the left and right averages, and the outermost point (3) of the cutting edge is provided at the center. By retreating the blade (3 ') from the central tip (3) by an appropriate angle, the cutting load applied to the cutting blade (4) between (3) and (3') is alleviated, and each part of the cutting blade is protected to improve durability. Is a significant improvement.

(3) Problem to be Solved by the Invention: The present metal saw blades are severely worn, damaged, and damaged. This is because the blade edge of the cutting blade acting at the time of cutting deviates to the left or right from the center. Because the cutting bending moment is applied to the blade from beginning to end, fatigue of the cutting edge is severe. The present invention is a saw blade for preventing bending or the like of the cut surface due to fatigue fracture or damage of the cutting blade.

(4) Means for solving the problem: When cutting soft aluminum or stainless steel having high viscosity, the load applied during cutting is very large, and the cutting heat is generated due to the high heat generated during cutting. The current situation is that the cutting edge of the cutting edge is markedly impaired because it is welded to the tip of the blade and is damaged or worn, which significantly reduces the cutting ability of the cutting edge. In order to overcome these difficulties, the cutting at the time of cutting must be divided into as many pieces as possible, and must be pushed out to the outside of the side surface of the saw blade without being stopped by the cutting edge of the cutting blade and discharged. In order to solve the above two points, it is a necessary condition that the cut of the cut object is first divided into two parts, the cutting width is also divided into half, and the cutting heat and the resistance are reduced accordingly.
Figure 4 (IV) is a side view of a conventional saw blade,
(h) represents the force for cutting the saw, and (Pc) in FIG. 4 (V) represents the cutting load when the saw is rotated in the R direction to perform the cutting action. This makes it clear that the forces applied to the saw blade surface during cutting are (Ph) and (P
It is the resultant force of c), and the force applied to the tip of the cutting blade (3) is obviously a vertical and lateral bending moment. The length (3) to (3 ') of the cutting line of the cutting blade is larger than the width of the desk (1) of the saw blade. It can be seen that the second cutting edge (2 ') exerts a bending moment on the saw desk in the opposite direction of the first blade (2). This causes metal fatigue in the cutting blade of the saw blade and eventually damages the cutting blade, which accelerates wear. Not only is the cutting width (3) to (3 ') large even with the cutting dust generated when cutting a conventional blade, but the cutting surface is toward the inside of the saw blade desk (1), so it is not easy to discharge it. Cutting chips tend to accumulate inside the blades of the saw blade. Since these chips contact the cutting surface and generate heat during cutting, the saw blade itself is also heated. According to the present invention, in order to solve the drawbacks of the metal saw blades currently used as described above, the sharpest tip of the cutting blade is provided at the central portion of the outer peripheral portion of the saw blade as shown in FIG. 4 (II) (3). , FIG. 4, (II
(3) of I) is positioned, and the side edge cutting blade (4) is moved from the cutting edge (3 ') to (3') by retreating from the cutting edge tip (3) toward the outer edge (3 ') at an appropriate angle. ), So that the cutting width is divided into two parts to the left and right and becomes shorter, so that the cutting powder is pushed out to the outer part of the saw body, and at the time of cutting, first from the center part of the cutting blade. Because it cuts, there is no left and right runout, and after cutting (P
Both h) and (Pc) cancel out all the cutting loads applied to both outer tips (3 ′) from the most pointed tip (3), so that the cut surface is a stable surface without bending. As for the conventional blade, the cutting width of one saw blade is almost twice as large as that of the present invention, and the cutting dust is discharged and accumulated toward the inside, which causes heating of the saw and fatigue of the cutting blade. Compared with the disadvantage that the load at the time also acts greatly on the left and right, the cutting width of the present invention is close to half, and the cutting powder is discharged toward the outside, so it does not accumulate between the blades of the saw blade. Since the cutting loads (Ph) and (Pc) at the time of cutting are canceled at any time, there is very little damage or breakage due to metal fatigue of the cutting edge.

(5) Operation: The saw blade configured as described above works by canceling the torsional moment acting on the cutting edge against any applied load (Ph) and (Pc) of the cutting edge, The discharge of the powder is also divided into two parts and discharged to the outside on the left and right of the saw blade, so that the heat generated by the contact between the cutting powder and the cutting surface is small.
At the time of cutting, there is a cutting edge at the tip, so there is little runout on the left and right at the beginning of cutting, and after cutting, the pushing load (Ph)
However, the saw blade can make a straight cut because it works to push in the cutting blades (3) with the left and right even tips.

(6) Example: FIG. 1 is a partial front view showing a part of the front surface of the saw blade of the present invention. FIG. 2 shows four types of cutting blade tips (2) of the present invention [FIGS. (I) (II) (III) (I
V)] is shown. FIG. 2 (V) is a plan view of a special saw blade in which the sharpest tip (3) of the cutting edge tip is arranged on the side surface of the saw blade desk (1). This is for cutting hard wood or resin. Is much more efficient than conventional blades, and the chips produced during cutting are subdivided twice as much as conventional blades and are less damaged. Second
FIG. 4 (IV) is a plan view of the saw blade of the present invention, but the retreat angle from the most apex (3) to the side edge apex (3 ′) of the cutting edge tip is 10 ° to 35 with respect to the center plane of rotation. It is known that the angle of receding is good, but this receding angle is proportional to the rotational speed of the saw blade, inversely proportional to the hardness of the material to be cut, and proportional to the viscosity. It goes without saying that the technical theory of the present invention is applied not only to circular saws but also to band saws and saw blades similar thereto.

(7) Effects of the invention: The saw blade of the present invention is characterized in that heat is generated very little during cutting, and therefore the cutting blade tip is less damaged, so that the saw blade is also highly durable. In addition, the work efficiency at the time of cutting is high, and even if the cutting edge portion (3) at the most apex is slightly worn and damaged, the cutting edge portion (4) is less worn, so that the cutting quality hardly changes even if cutting is performed. This is because the cutting blade part (4) having a receding angle absorbs the unique impact of the saw blade, which is always generated by the cutting blade having a receding angle, and therefore the cutting is performed with the cutting blade. . This is a big difference from the conventional cutting blade of a saw that cuts correspondingly from the front so that the cutting is performed while receiving the impact. Chips are discharged well, and if different cutting blade tips (4 ') are installed as shown in Fig. 3 (III), it is possible to cut finely. This is to maintain the durability of the cutting blade. Is a big requirement. It is clear that the effect is greater than expected if the receding angle of the cutting edge is variously adapted depending on the object to be cut. Even when the saw blade is used for mowing, it has been confirmed that the degree of scattering of the cutting dust of the plant is far less than that of the conventional saw blade. According to the current saw blade industry, it may be out of the ordinary wisdom of a saw blade to install the tip of the main cutting edge portion at the center of the rotating surface of the saw blade outer periphery, but as mentioned above, this book is based on various theories. It is true that the saw blade of the invention has many advantages and is proven by experiments.

[Brief description of drawings]

FIG. 1 is a front view of a part of a saw blade provided with the cutting blade tips (I) and (V) of the present invention. Figure 2 (I)
(II) (III) (IV) is an enlarged view of a left side view of a cutting blade of each shape. FIG. 2 (V) is an enlarged view of the plane of FIG. 2 (I). (VI) of FIG. 2 corresponds to FIG.
FIG. 11 is an enlarged view of the plane of II). (A) of (I) in FIG.
(B) is an enlarged view of a welded portion of each cutting blade of (a) and (b) of (II) of FIG. 3. FIG. 3 (III) is an enlarged plan view of a saw blade in which the cutting blade tips (a) and (b) of FIG. 3 (II) are alternately installed. (I) in FIG.
It is the front view, top view, left side view of the welding part of the cutting blade tip (2). FIG. 4 (II) is an enlarged view of the left side view of the cutting blade tip of the present invention. FIG. 4 (III) is an enlarged plan view of a saw blade provided with the cutting blade tip of FIG. (II). FIG. 4 (IV) is an enlarged view of the left side surface of the cutting blade tip of the conventional saw blade. FIG. 4 (V) is an enlarged plan view of a conventional saw blade having the cutting blade tip of FIG. 4 (IV) welded thereto.

[Explanation of symbols]

 (1) ……… Saw blade desks (2), (2 ') ……… Cutting blade tip (3) ……… Cutting edge tip most pointed (3') ……… Cutting blade tip ( 4) ……… Side edge cutting blade (4 ′) ……… Cutting blade tip (Ph) ……… Saw pushing load (Pc) ……… Saw cutting load (R) ……… Saw blade rotation direction

Claims (3)

[Claims] 1. A saw blade desk (1) of steel plate of appropriate thickness.
An appropriate saw blade shape for welding a cutting blade tip (2) made of super steel is provided on the outer peripheral portion of the cutting edge tip (3) with a receding angle. Side edges are used as side edge cutting blades (4), and a cutting edge tip (2) having sharp edge cutting edge portions (3 ′) installed on both edges is placed at the center of the outer peripheral portion of the saw blade desk (1) to cut the most pointed edge. A metal tip saw, characterized in that an appropriate number of blade portions (3) are welded and installed at appropriate intervals in the direction of rotation of the saw blade desk (1). 2. A cutting edge tip (2 ') made of super steel, the tip of which is the sharpest cutting edge (3), and the side with an appropriate receding angle from the sharpest cutting edge (3). An edge cutting blade (4) is formed, the tip of which serves as the tip portion (3 ') of the cutting blade tip, and the side surface of the cutting edge portion (3) at the most tip is held flush with the side surface of the saw blade desk (1). The metal tip saw according to claim 1, wherein the saw blade desk (1) is sequentially and alternately welded. 3. A cutting blade tip (2) in which both side edges having a receding angle from the cutting blade portion (3) are used as cutting blades (4), and tip cutting blade portions (3 ′) are installed at both tip ends of the cutting blade (2). 2. The metal tip saw according to claim 1, wherein rectangular cutting blade tips (4 ') having different cutting blade portions (4) are alternately arranged at appropriate intervals.