JPS6243762Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary cutting tool, particularly a rotating cutting tool having a self-cooling function.

When attaching multiple rotary blades, such as a split saw, to the main shaft of a machine, insert a spacer between the circular saws to adjust the spacing between them, and tighten the flange plate with a retaining nut. ing. During cutting, the main shaft is rotated to make a cut in the material and feed the material.

However, if cutting work with such a blade continues for a long time, cutting heat and frictional heat between the material and the blade will accumulate on the blade and its mounting area, causing a change in the stress distribution of the circular saw body. This made cutting difficult, and in severe cases, the blade could become stuck in the material and become unable to rotate.

In order to solve these problems, the present invention aims to provide a rotary cutter that has a cooling function that allows normal cutting work to continue stably for a long time by cooling the cutter and its attachment part. do.

Until now, as a rotary cutter having such a purpose, there is a rotary cutter known as Utility Model Publication No. 58-26750 as shown in FIGS. 6 and 7. This known example provides a washer and a circular saw with a plurality of through holes a extending in the axial direction of their mounting spindles, and allows air to flow through the through holes, thereby tightening the washer of the rotary cutter. It was intended to be cooled. However, with this configuration, only the thick portion near the center of the washer and the circular saw is cooled, and the circular saw is thinner than the thick washer, so the cooling effect is very small. The cutlery, which generates the most heat, was only cooled indirectly through the washer, and the cooling effect on the cutler itself was hardly expected.

The present invention provides a structure for directly cooling a cutting blade, and provides a rotary blade having a useful cooling function, which has a particularly remarkable cooling effect especially in a cutting saw.

A specific example will be described below.

1 to 5 show embodiments of the present invention. 20 is a rotating main shaft of the machine used. A required number of circular saws 22 (three in FIG. 1) are attached to the main shaft 20 with a flange plate 24 and a spacer 26 interposed between the nut 28 and the main shaft 2.
It is fixed by a fixing flange 25 fixed to 0. As shown in FIGS. 3 to 3A, the flange plates 24 and 25 have an annular counterbore 30 on their inner surfaces, and a plurality of holes 32 are concentrically provided in the center of the counterbore. The hole 32 is located at a position larger than the diameter of the nut 28 and not blocked by the nut when fastened. Note that the center portion of the fixed flange 25 is also completely counterbore, but this is not essential. Further, although the peripheral cutting portion of the circular saw 22 is the same as a known one, a plurality of long grooves 34 are provided in the center portion. As shown in FIG.
0, and the outer end protrudes outward from the flange plate 24. Furthermore, Maza 26 is the fifth ~
As shown in FIG. 5A, an annular counterbore 36 having substantially the same dimensions and shape as the annular counterbore 30 of the flange plate 24 is provided on both sides thereof. Further, a plurality of through holes 38 are provided near the center of this annular counterbore portion 36.
is provided. It is preferable that the size and number of the counterbore portions 36, 30 and holes 38, 32 provided in the spacer 26 and the flange plate 24 be the same for processing purposes, but this is not essential.

When the rotary cutter shown in FIGS. 1 and 2 is rotated at high speed, the air present in the tip pocket of the circular saw 22, indicated by number 40 in FIG. Negative pressure is generated near the circular saw blade tip. Because of this negative pressure, if the circular saw has a structure in which air flows from the axial direction toward the cutting edge, atmospheric pressure will generate airflow toward the cutting edge where the pressure is lower than the axial center. The circular saw blade tip is cooled by the airflow. In FIGS. 1 and 2, when negative pressure is generated near the circular saw blade tip, air near the main shaft 20 is sucked into the rotary cutter through the holes 32 of both flange plates 24. A portion of the sucked air flows into the counterbore 30 inside the flange plate 24.
Further, a portion further passes through the long groove 34 of the circular saw 22 to the spacer 26 and is accumulated in the counterbore 36 of the spacer 26. Further, a part of the spacer 26 is accumulated in the spacer counterbore 36 on the side that is in contact with another circular saw through the through hole 38, and at the same time, a part of the spacer 26 is also accumulated in the long groove 34 of the circular saw 22. It then flows into the adjacent spacer. The air thus accumulated in the annular counterbore portions 30, 36 of the flange plate 24 and the spacer 26 is then provided in the circular saw 22 itself, with the radially outer end exposed from the flange plate and the spacer, as shown in FIG. The air is drawn out through the long grooves 34 that are in contact with the cutting edges of all the circular saws 22. For this reason, in the present invention, the air around the main shaft has the function of cooling the cutting edge of the circular saw from both sides as the blade rotates.

In this way, the present invention sucks air from around the main shaft into the flange plate, spacer, and central part of the circular saw by reducing the pressure in the tip pocket generated by rotating the rotary blade, and at the same time releases the air to the cutting edge of the rotary blade. As a result, the flange plate, spacer, and center of the circular saw are naturally cooled by air flow, and the cutting edge is also cooled in the same way, completely eliminating the negative effects of heat generation on cutting operations. The present invention provides a practically extremely useful device that can maintain good cutting conditions for a long period of time.

Although the present invention is particularly useful in splitting saws, it will be apparent to those skilled in the art that it can be similarly effective in other rotary blades.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the first embodiment of the present invention, Figure 2 is a side view of Figure 1, Figure 3 is a front view of the flange plate of the embodiment of Figure 1, and Figure 3A is Figure 3. 3A-3
A view from arrow A, FIG. 4 is a front view of the circular saw of the embodiment shown in FIG. 1, FIG. 5 is a front view of the spacer of the embodiment shown in FIG. 1, and FIG. 5A is a view 5A-5A of FIG. 6 is a sectional view showing an example of a known rotary cutter, and FIG. 7 is a sectional view showing an example of a known rotary cutter.
FIG. Explanation of symbols, 20: Main shaft, 22: Circular saw, 24:
flange plate, 25: fixed flange plate, 26: spacer, 30: counterbore, 32: hole, 34: long groove, 3
6: Counterbore, 38: Through hole, 40: Chip pocket.

Claims (1)

[Claims for Utility Model Registration] A rotary knife comprising at least one cutting knife attached to a main shaft by a flange plate and/or spacer held from the side thereof, Accordingly, in a rotary blade that sucks surrounding air in the axial direction of the main shaft through holes provided in the flange plate and/or spacer and the cutting blade, and cools the blade with the air, the blade is opposite to the cutting blade. A counterbore is provided on the surface of the flange plate and/or spacer that contacts the side surface of the cutter, and the counterbore and the hole are communicated, and from the counterbore to at least a portion beyond the outer periphery of the spacer. A rotary knife characterized in that the cutting knife is provided with a plurality of elongated long grooves.