JPH047280Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cutter bit used in a shield tunneling machine.

[Conventional technology and its problems]

The cutter bits attached to the cutting wheel serving as the cutter head of a shield tunneling machine have various shapes depending on the cutting method and their role, and their arrangement also varies.

Figures 21a and 21b show an example of the cutter face of the cutting wheel 1, including a leading bit (S type) 5, a leading bit (W type) 5', an outer periphery rear protection (hood protection) cutter 6, A peripheral front protection (hood protection) cutter 8, a main cutter (W type) 7 for excavation, a main cutter (W type) 9 for a gauge, a copy cutter 19, etc. are provided.

FIGS. 22 and 23 show an example of the preceding bit 5, in which numeral 10 is a base and 11 is a carbide tip. In addition, FIGS. 24 and 25 show the auxiliary bit 12.
An example of the gauge auxiliary bit 13 is shown in FIGS. 26 to 28.

In this way, conventional cutter bits exist as separate types such as the leading bit 5 and the auxiliary bit 12, and taking the gauge auxiliary bit 13 as an example,
It is weak against force from the direction of the arrow α, and the shaded areas show significant wear. The preceding bit 5 and auxiliary bit 1
In No. 2, the shaded area is easily worn and the chip 11 is also easily removed.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
Excellent wear resistance and chip retention against forces from multiple directions, and secures sufficient cutting angle and relief angle even when the cutter head rotates forward, reverse, and moves in the radial direction for continuous cutting. In addition, we have created a cutter bit that can be used for most things, such as auxiliary bits for the face side and outside, leading bits, copy cutters, main cutters, center cutters, etc., and has a wide range of applications, resulting in a reduction in the amount of bits installed. It is about providing.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention consists of a combination of a tip with a planar square shape with a cutting edge formed on the entire circumference and a dowel hole in the center, and a shank with a dowel protruding from the top surface that fits into the dowel hole. The gist of this is that

[Effect]

According to the present invention, the chip has an angular planar shape and its entire circumference is a cutting edge, so it can always excavate from the cutting edge and can have a cutting edge in any direction. Moreover, since the chip is attached flat to the top of the shank, the clearance surface can be minimized, and since the chip is connected to the shank by a dowel structure, it has sufficient rigidity even when force is applied from all directions. , resulting in less wear and tear.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Figures 1 to 3 show a first embodiment of the cutter bit of the present invention, in which reference numeral 14 indicates a carbide chip;
15 is a shank to which the chip 14 is attached.

In this example, the chip 14 has a modified octagonal planar shape with the diamond-shaped corners cut flat, and has a dowel hole in the center.
6 was established.

On the other hand, the shank 15 has a rectangular planar shape, and a dowel 17 that fits into the dowel hole 16 is formed on the upper center surface.

A dowel 17 is fitted into the dowel hole 16, the chip 14 and the shank 15 are connected by brazing, and a build-up 18 is applied to the upper surface of the shank 15.

This brazing method can be done by placing an appropriate amount of wax between the dowel holes 16 and dowels 17 and heating it, or by adding wax while heating. High frequency induction brazing is suitable.

Note that the overlay 18 is a two-layer overlay.
EC-10 (trade name of Toshiba Tungaloy Corporation) was used.

The tip 14, which is flatly attached to the shank 15 in this manner, has a rectangular planar shape with corners protruding in all directions, so that the entire circumference is formed as a cutting edge.

Therefore, it can be used in place of the leading bit 5 as shown in FIGS. 22 and 23, or as the 24th bit.
It can be used in place of the auxiliary bit 12 shown in FIGS.

4 to 6 show a second embodiment of the cutter bit of the present invention, which is structurally the same as the first embodiment, but the planar shape of the chip 14 and shank 15 is close to a square. It is.

This second embodiment can be used in place of the gauge auxiliary bit 13 shown in FIGS. 26 to 28, and has a shape that is strong against left and right and external forces at the outermost periphery.

FIGS. 7 and 8 show a third embodiment of the present invention, which can be used as a bit for preventing wear on the outer circumference of a covering wheel, replacing the conventional button tip blade.

As a fourth embodiment, as shown in FIGS. 9 to 11, two chips 14 in the first embodiment may be provided in one shank 15, and as a fifth embodiment, The shank 15 may be made high as shown in FIGS. 12 to 14.

Furthermore, as an applied example, a plurality of chips 14 may be arranged in the center of the copy cutter 19 to compensate for wear and damage of the copy cutter 19, as shown in FIGS. 15 to 18.

In addition, in the above embodiments, the tip 14 was considered to be two-dimensional with the cutting edge on the entire circumference, but the tip 14
As shown in FIGS. 20 and 20, it is also possible to make the upper surface pointy in a chevron shape so that the upper surface also serves as a cutting edge, making it three-dimensional.

[Effect of idea]

As mentioned above, the cutter bit of the present invention has a cutting edge around the entire circumference of the chip, so it can cut even if force is applied from any direction, and when installed on a cutting wheel, it can be used as a multi-type bit with various roles. By using this bit, it is possible to reduce the amount of bits installed.

In addition, since the chip is attached flat to the shank via a dowel, the flank surface can be kept to a minimum, improving wear resistance against forces from multiple directions.
Furthermore, it has a high chip retention force and is highly rigid.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the first embodiment of the cutter bit of the present invention, Fig. 2 is a front view of the same, Fig. 3 is a side view of the same, Fig. 4 is a plan view showing the second embodiment, and Fig. 5. 6 is a side view of the same, FIG. 7 is a plan view showing the third embodiment, FIG. 8 is a front view of the same, FIG. 9 is a plan view showing the fourth embodiment, and FIG. is a front view of the same as above, FIG. 11 is a side view of same as above, FIG. 12 is a plan view showing the fifth embodiment, FIG. 13 is a front view of same as above, FIG. 14 is a side view of same as above, and FIG. 15 is a sixth embodiment. Fig. 16 is a front view of the same as above, Fig. 17 is a view taken along line A in Fig. 15, Fig. 18 is a view taken along line B of Fig. 1;
9 is a front view of the seventh embodiment, FIG. 20 is a side view of the same as above, FIGS. 21a and 21b are front views showing an example of the cutter wheel face, and FIG. 22 is an example of a conventional preceding bit. 23 is a side view of the same, FIG. 24 is a front view of an example of a conventional auxiliary bit, FIG. 25 is a side view of the same, and FIG. 26 is a plan view of an example of a conventional auxiliary gauge bit. FIG. 27 is a front view of the same, and FIG. 28 is a side view of the same. 1... Catering wheel, 5, 5'... Leading bit, 6, 8... Hood protection cutter, 7...
Main cutter, 9... Main cutter for gauge, 10... Base, 11... Carbide tip, 12...
... Auxiliary bit, 13 ... Gauge auxiliary bit, 14
...chip, 15...shank, 16...dowel hole, 17...dowel, 18...meat, 19...copy cutter.

Claims (1)

[Scope of utility model registration request] A cutter bit characterized in that it is made of a combination of a tip having an angular planar shape with a cutting edge formed on the entire circumference and a dowel hole in the center, and a shank having a dowel projecting from the upper surface to fit into the dowel hole.