JPS6021136Y2 - Circular saw with oil hole - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a circular saw for cutting metal, and more specifically to a circular saw with an oil hole.

It is well known that circular saws for metal cutting include those that use high-speed steel as the cutting blade material and those that use brazed cemented carbide. Various materials are selected and used, but as cutting speeds have increased and work materials have become more difficult to cut, recent trends have seen an increase in the use of cemented carbide.

By the way, when cutting the work material with this kind of circular saw,
Regardless of the material of the cutting blade of the saw, cutting fluid is usually supplied from the outside to the cutting site for cooling and lubrication purposes.

However, the wall thickness of a circular saw is thin compared to its outer diameter, so the gap between the workpiece groove formed by cutting and removal and the saw body is small, and since the saw rotates, the part that is actually being cut is It is extremely difficult for cutting fluid to penetrate into the shaft, and a sufficient cooling effect cannot be obtained.

Therefore, chips ejected by cutting heat and frictional heat adhere to the cutting blade of the circular saw, damaging the cutting blade, causing chipping, and accelerating wear of the cutting blade, significantly reducing tool life. It's forcing me.

This phenomenon is particularly noticeable as the work material is difficult to cut and as the cutting speed increases.

However, the factors that affect the tool life of this type of circular saw are not only the above-mentioned factors, but also the influence of vibration generated during cutting, which is extremely large, and there is a need for easy and inexpensive anti-vibration measures.

In view of the above-mentioned circumstances, the purpose of this invention is to reduce vibration during cutting, constantly supply cutting fluid to the cutting edge that is actually cutting, and provide a circular saw with low vibration and long tool life. Its features include a protrusion 3 on the outer periphery into which the cutting blade segment 2 fits, and a unit with a central hole 4 in the center for attachment to a saw machine. The top surface 5 of the protrusion 3 is attached to the disc-shaped main body 1 made of one steel plate.
A plurality of main oil holes 7 penetrating through the inner peripheral surface 6 of the center hole 4 are cut at appropriate intervals, and a fitting groove 8 with a depth H) larger than the height h) of the protrusion 3 is formed in the lower part of the cutting edge. The fitting groove 8 of the cutting blade segment 2, which has a plurality of branch oil holes 10 penetrating from the bottom surface 9 of the fitting groove 8 to the blade groove G of each cutting blade T, is connected to the fitting groove 8 of the cutting blade segment 2 at the top thereof. A plurality of them are connected and fixed to the protrusion 3, and the annular oil reservoir chamber 11 is formed by the protrusion 3 and the fitting groove 8.

The present invention will be explained in detail below based on the illustrated embodiments.

In Fig. 1, 1 is a circle made of a single steel plate with a protrusion 3 having an appropriate height h) (see Fig. 3) on the outer peripheral edge for fitting the cutting blade segment 2. It has a plate-like body with a central mounting hole 4 in the center for attaching it to a saw machine.
Also, a plurality of main oil holes 7 are cut at appropriate intervals in the center of the thickness of the main body 1, penetrating from the top surface 5 of the protrusion 3 to the inner circumferential surface 6 of the center hole 4.

As shown in FIG. 2, the cutting blade segment 2 is provided with a fitting groove 8 at its lower part, the depth of which is larger than the height h) of the protruding part 3, and whose upper part is formed with a cutting blade part. The cutting edge portion is composed of a cutting edge T and a cutting groove G, and in this embodiment, the cutting edge T is formed by brazing a carbide tip 12.

Incidentally, reference numeral 10 denotes a branch oil hole drilled from the bottom surface 9 of the fitting groove 8 to the blade groove G of each cutting edge T.

The fitted state between the disc-shaped main body 1 and the cutting blade segment 2 is as shown in FIG. The depth H) of the groove 8 and the height h) of the protrusion 3 affect the oil reservoir chamber 11.

The cutting blade segments 2 are arranged continuously around the entire outer peripheral edge of the main body 1 and fixed with studs 13, so that the oil reservoir chamber 11 has an annular shape.

According to the circular saw of the present invention having the above-mentioned configuration, since the oil supply hole, that is, the branch oil hole 10 that opens in the blade groove G is provided, cutting oil is supplied directly to the cutting edge portion that is actually cutting. Therefore, an extremely excellent cooling effect was obtained, and there was no welding of chips to the cutting edge, and chipping and wear were significantly reduced.

Furthermore, the cutting edge part involved in cutting is cooled externally by the cutting oil from the branch oil hole 10 and internally cooled by the cutting oil in the annular oil reservoir chamber 11 formed on the outer peripheral edge of the main body 1. The cooling effect prevents the cutting edge from expanding due to cutting heat, reducing friction between the workpiece and the saw, resulting in better cutting.

The effect of providing the annular oil storage chamber 11 is that in addition to the internal cooling effect described above, the stored oil exhibits a damping ability.
It has the effect of significantly reducing vibration during cutting.

Next, for reference, an example of how to supply cutting fluid is shown in Section 4.
It will look like the figure.

That is, an oil storage chamber 15 is formed in the rotating main shaft 14 of the saw, and an annular groove 17 is cut in the saw fitting part 16 of the rotating main shaft 14 at a position corresponding to the main oil hole 7 of the saw. An appropriate number of communication holes 18 are cut out to communicate the annular groove 17 and the oil storage chamber 15.

A circular saw is fitted into the saw fitting portion 16 of the rotating shaft 14, and the nut 1 is
9, the cutting fluid supplied from outside the machine passes through the oil storage chamber 15, the communication hole 18, and the annular groove 17, disperses to each main oil hole 7 of the saw body 1, and then gathers again in the annular oil storage chamber 11. The oil is injected into the blade groove G from the oil reservoir chamber 11 through the branch oil hole 10.

As described in detail above, according to the present invention, cutting fluid can be directly supplied to the part that is actually being cut, and internal cooling is also possible due to the action of the annular oil reservoir chamber 11, resulting in a remarkable cooling effect.

Therefore, there is no welding of chips as in the conventional case.

Moreover, since the cooling capacity is large, it is possible to increase the cutting speed, and efficient cutting becomes possible.

Furthermore, by providing the annular oil reservoir chamber 11, this exhibits a damping ability to suppress vibrations during cutting, and exhibits a vibration-proofing effect.

As a result, chipping of the cutting edge is drastically reduced, wear is also reduced, and a circular saw with a long tool life can be provided.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the circular saw of the present invention, Figure 2 (A) 9 is an explanatory diagram of the cutting blade segment, A is a side view, mouth is an end view, and Figure 3 is a disc-shaped main body and the cutting blade segment. Explanatory diagram of the fitted state, No. 4
The figure is an explanatory diagram of a cutting fluid supply method. DESCRIPTION OF SYMBOLS 1... Disc-shaped main body, 2... Cutting blade segment, 3... Protrusion part, 4... Center hole,
7... Main oil hole, 8... Fitting groove, 10.
... Branch oil hole, 11 ... Annular oil reservoir chamber, 1
4... Rotating main shaft, 15... Oil storage chamber, 1
6... Saw fitting part, 17... Annular groove.

Claims (1)

[Scope of utility model registration request] The above-mentioned disc-shaped main body 1 is made of a single steel plate, which has a protrusion 3 on the outer peripheral edge into which the cutting blade segment 2 fits, and a central hole 4 in the center for mounting on a saw machine. Projection 3 Top surface 5
A plurality of main oil holes 7 penetrating through the inner peripheral surface 6 of the center hole 4 are cut at appropriate intervals, and a fitting groove 8 with a depth H) larger than the height h) of the protrusion 3 is formed in the lower part of the cutting edge. A cutting blade segment 2 having a plurality of branch oil holes 10 extending from the bottom surface 9 of the fitting groove 8 to the blade groove G of each cutting blade T is attached to the protrusion 3 of the disc-shaped main body 1. A circular saw with an oil hole characterized in that a plurality of oil holes are connected and fixed, and an annular oil reservoir chamber 11 is formed by the protrusion 3 and the fitting groove 8.