JPS5841055Y2 - drill tool - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a tool as a drill.

The cross-sectional shape of the conventional tool, that is, the twist drill a, is the second
As shown in the drawings and FIG. 3, both the vicinity of the cutting edge and the guide portion C were symmetrical, and the entire range from the vicinity of the cutting edge to the guide portion C had the same cross-sectional shape.

Further, the shank part d of the drill is fixed with equipment or a tool to provide rotational interlocking, and the drill itself is rotated, or the workpiece is rotated without rotating the drill, and the cutting blade cuts the workpiece.

The insect removal e, the cuttings that are removed are transmitted through the groove e and into the shank part d.
It is discharged to the side.

When cutting with the cutting edge b', cutting heat is generated, resulting in a decrease in cutting performance.

To prevent this, cutting oil is supplied, and this cutting oil is sent through the groove e to the cutting edge b't.

Therefore, the role of the groove e of the drill is to discharge chips and supply cutting oil.

However, the flow directions of this chip discharge and cutting oil supply are opposite, and they flow in directions that cancel out the effects of each other.

If the two flows of the groove e of the drill can be performed smoothly, the cutting performance of the drill will be improved.

As shown in Figure 5, conventional drills are designed to make the cross-sectional area of the groove e as large as possible (θ1 < θ2), but if this cross-sectional area is made large, the cross-sectional strength of the drill itself decreases, so the cutting resistance increases. This results in decreased cutting performance or damage.

Therefore, the current situation is that the cross-sectional area of the groove e cannot be made too large.

As a countermeasure against this cutting resistance, there is a method of increasing the core thickness W shown in FIG. 5, but if it is too thick, the cutting resistance increases, and this method also has its limits.

Therefore, the conventional drill has a problem in that it cannot satisfy both the discharge of chips and the supply of cutting oil.

Therefore, the deeper the machining length, the shorter the life of the drill and the lower the cutting efficiency.

The present invention was developed in view of the above circumstances, and its purpose is to provide a drill tool that can improve cutting efficiency by improving the supply of cutting oil and the discharge of cutting waste. There is a particular thing.

Hereinafter, the present invention will be explained with reference to FIG. 6 and subsequent figures.

In the drawing, 1 is the effective cutting edge length, that is, the vicinity of the cutting edge, and 2
3 is a guide portion, 3 is a cutting edge portion, γ is a shank, and 8 is a tank.

The cross-sectional shape of the vicinity of the cutting edge 1 is as shown in FIG. 8, in which two spiral grooves 4 are formed in the main portion 40 and an outer peripheral margin 9 is provided.

A guide 41 is formed in the guide portion 2 .

As shown in FIG. 8, the guide 41 is constructed by removing the extension part 24 of one interior 21 by a certain dimension in the vicinity of the cutting edge 1, leaving the extension part 23 of the other interior 22 facing this deleted part 21a, and The extension part 23 is removed by a certain dimension, the extension part 24 of one interior 21 facing the removed part 23a is left, and the extension parts 23.24 of the circular interior 21.22 are alternately formed with deletion parts 21a, 23a. It is.

A margin 11.13 is formed in the extension portion 23.24, and the guide portion 2 has a core thickness t1.1 to withstand cutting resistance during cutting. t2 is provided, and furthermore, a groove 5 is formed.

The shank TI7') tank 8 is shown in FIGS. 11 to 16.
The cross-sectional shape shown in the figure may also be used.

As described above, the drill according to the present invention has the groove 4 near the cutting edge 1.
The feature is that the unit surface area of the groove 5 of the guide portion 2 is larger than the unit area of the groove 5 of the guide portion 2.

Moreover, when increasing the area per unit of the groove 5, the core thickness E
1yj2 is made thick enough to withstand cutting resistance.

That is, in the present invention, as described above, the drill body consists of the cutting part 3, the vicinity of the cutting edge 1, the guide part 2, and the shank 7. The guide part 2 is formed by forming two grooves 4 and adding an outer peripheral margin 9 to the main part 40,
The extended portion 24 of No. 1 is removed by a certain dimension to create this removed portion 21a.
The extension part 23 of the other interior 22 facing the other side is left, and this extension part 23 is further removed by a certain dimension to form the removed part 23aK.
Leaving the extension part 24 of one interior 21 facing each other, both interiors 2
1.22 extension parts 23.24- alternately deleted parts 21a,
23a to form the groove 5, and the extension 23.24 to form the margin 11.13, and the main part 4 of the drill body.
This drill tool is characterized in that the core thicknesses t1 and t2 of 0 are made thick enough to withstand cutting resistance.

Therefore, the area per unit of the grooves 5 in the guide part 2 can be made larger than the area per unit of the grooves 40 in the vicinity of the cutting edge 1, so when drilling into a workpiece, cutting oil flows through the grooves 5 and 4. It is easily supplied to the cutting edge portion 3, and the cutting waste can also be easily discharged.

In this way, since the cutting oil supply property and the cutting waste discharge property are improved, the cutting efficiency can be improved.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted side view of a conventional drill, Fig. 2 is a cross-sectional view taken along the line ■-■, Fig. 3 is a cross-sectional view taken along the line m-■ in Fig. 1, and Fig. 4 is a cross-sectional view taken along the line m--■ in the drawing. An explanatory diagram of the drilling process that is buttoned on a conventional drill, Fig. 5 is a longitudinal sectional view of the conventional drill, Fig. 6 is a side view of the present invention-embodiment, and Fig. 7 is a view from the arrow direction in Fig. 6 Figure 8 is a sectional view taken along line XX in Figure 6, and Figure 9 is a sectional view taken along line XX in Figure 6. 10 is a sectional view taken along the line XX in FIG. 6, FIG. 11 is a side view of another embodiment of the shank, and FIG. FIG. 13 is a side view of another embodiment of the shank;
The drawings are a view as seen from the arrow direction in FIG. 13, FIG. 15 is a side view of another embodiment of the shank, and FIG. 1 is the vicinity of the cutting edge, 2 is the guide portion, and 4 and 5 are the grooves.

Claims (1)

[Scope of utility model registration request] The drill body is composed of a cutting edge portion 3, a vicinity of the cutting edge portion 1, a guide portion 2, and a shank 7, and two spiral grooves 4 are formed in the vicinity of the cutting edge portion 1 and the main portion 40. The guide part 2 is formed by adding an outer circumferential margin 9 to the cutting edge 1, and the guide part 2 is formed by removing the extension part 24 of one inner part 21 by a certain dimension in the vicinity of the cutting edge part 1, and forming an extension part of the other inner part 22 opposite to this removed part 21a. 23 is left, and this extension part 23 is deleted by a certain dimension to form an extension part 2 of one interior 21 facing this deleted part 23a.
The groove 5 is formed by alternately forming deleted parts 21a and 23a on the extension parts 23.24 of the inner parts 21 and 22 of 1 circle, leaving 4, and the margin 11.13 is formed on the extension part 23.24. The core thickness t1 of the main portion 40 of the main body. A drill tool characterized in that t2 has a thickness that can withstand cutting resistance.