JPS62176712A - Method of producing band saw for cutting hard substance - Google Patents

Abstract

PURPOSE:To provide a band saw capable of cutting precisely by forming notches at equal intervals in one side edge of the band steel plate and providing a notch portion in a mountain portion between the notches to insert a diamond tip in said notch portion and supply current to said tip to be attached to the band steel plate. CONSTITUTION:While a band steel plate 1 is formed on one side edge with shallow intermittent notches 2 at predetermined internals, notch portions 3 are provided respectively on mountain portions between these intermittent notches 2. A solid tip 4 made of sintered alloy containing diamonds is inserted in this notch portion 3, and the tip 4 and a band plate 1 beneath said tip are pressed from above and below by electrodes 5, 5 and supplied with predetermined current so that the tip and band plate are attached to each other in the contact portion by electric resistance. Thus, the tip and band steel plate can be easily attached to each other to provide a sharp band saw with few loading.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is for cutting (including cutting) hard materials including various metals such as granite, marble, cemented carbide, ceramics, tiles, semiconductors, and ceramics. The present invention relates to this method of manufacturing a strip for cutting hard materials.

(Prior Art) Conventionally, band saws mainly used for cutting hard materials have U-shaped intermittent notches (8) equidistantly spaced on a band plate (6) made of steel plate, etc., as shown in Fig. 2. A notch (9) is provided between the intermittent notches (8), and a cube or other chip ( 7) is embedded so as to protrude from about half to two-thirds, and the embedded part of the chip (7) and the notch (9) are bonded together by silver soldering.

(Problems to be Solved by the Invention) In such a conventional technique, since the chip (7) and the strip plate (6) are bonded by silver solder α, the first
Then, as shown in Figure 3, the melted silver solder QOI becomes a chip (
There is a problem in that the tip (7) penetrates as if absorbed into the Mi weave, causing clogging of the tip (7) during cutting and reducing the cutting force.

That is, in the tip (7), diamond particles and various metal powders Q31 are combined with appropriate gaps, and the gaps allow removal and circulation of cutting waste, cutting oil, etc. It can be cut without any clogging, but due to the brazing process, there is always melted silver solder α0 in the gap.
) enters and becomes clogged, impeding the cooling effect, and the silver solder θO) also has increased ductility, reducing sharpness and increasing heat generation during cutting.

Secondly, since brazing work is involved, the heating time for brazing at 600°C to 700°C is about 10 to 20 seconds, and the strip plate (6) is heated in the heat-affected area (+11 Therefore, deep (large) intermittent notches (8) must be provided, and cracks are likely to occur from the bottom of the intermittent notches (8) during high-speed rotation, etc. At the same time, even if sufficient tension is applied to the strip plate (6), the tension is applied to the cutting edge, which is the chip (7). The problem was that it couldn't be done.

(Means for Solving the Problems) In order to solve these problems, according to the present invention, evenly spaced intermittent notches (2
), and a notch (3) is bored between the intermittent notches (2) and the notches '3)! In this method for manufacturing a strip for cutting hard materials, which is made by bonding a tip (4) made of a sintered alloy containing diamond, the strip plate (
This method of manufacturing a band for cutting a hard material is provided, which is characterized in that a current is passed between the tip (1) and the tip (4), and the two are welded and bonded by their electrical resistance.

In the above configuration, the current flows between the chip (4) and the strip plate (1).
It can be flushed by pressing 1.

In this case, more stable and strong binding can be achieved.

Further, in the above configuration, the current can be applied by pressing the chip (4) against the strip plate (1) by a desired constant dimension.

In this case, the depth (
4) The binding position (height) can be kept constant.

(effect) The above technical means works as follows.

By passing a current between the chip (4) and the strip plate (11), the contact area between the chip (4) and the strip plate (1), which has a large electrical resistance, instantaneously becomes high temperature. This instantaneous high temperature that melts and welds the respective contact parts is within about 1 second and can be bonded with almost no thermal effect on the strip plate (1), so the intermittent notch (2) There is no need to make it deeper than its original function of discharging cutting chips and dispersing stress during rotation, etc., and it can be made shallow (smaller) to the extent that it is not necessary.

Furthermore, since the bonding is performed by melting the mutual structures of the chip (4) and the strip plate (1), and other substances such as silver solder are not involved, the Mi of the chip (4) It works so that it can be bound without clogging the inside of the jar.

(Embodiment) An embodiment of the present invention will be described with reference to the drawings (11
is a strip plate made of thin steel material, and the strip plate (11) has shallow intermittent notches (2) bored at equal intervals, and the intermittent notches (2) and the intermittent notches (2). A notch (3) is bored between each.

(4) is a chip made of a sintered alloy containing diamond, and this chip (4) is formed into a cube and is fitted into each of the above-mentioned notches (3).

Then, the inserted chip (4) and the strip plate (1) below it are pressed by electrodes (5) from above and below, and a predetermined current is passed between the electrodes +51 (5), so that the chip (4)
) and the contact portion of the strip plate (1) with the notch (3).

The present invention is not limited to the above-mentioned embodiments. For example, by arranging a large number of electrodes, a large number of chips may be bonded at once, and the strip plate may have an end or an endless board. It may be continuous.

(Effects of the Invention) As explained above, the present invention allows chips and strip sheets to be easily bonded together without the need for special techniques such as brazing work, and moreover, without intervening brazing or the like. It can be bonded with extremely little heat influence.

Therefore, it is possible to provide a band saw with good sharpness and less clogging by giving a bad shadow to the weave of the tip which becomes the cutting edge. In addition to not causing cracks, the tension applied to the strip plate is directly applied to the cutting edge, which allows the cutting edge to sufficiently withstand the resistance during cutting, making it possible to provide a band saw that can cut with high precision. It is something that you have.

[Brief explanation of drawings]

Fig. 1 is a front view of main parts showing an embodiment of the present invention, Fig. 2 is a front view of main parts showing a conventional band saw for cutting hard materials, and Fig. 3 is an enlarged explanation showing the tip of Fig. 2. It is a diagram. In the drawing, (1) is the strip plate, (2) is the intermittent notch, (
3) shows a notch, (4) a chip, and (5) an electrode.

Claims (1)

[Claims] 1 Intermittent notches (2
), a notch (3) is bored between the intermittent notches (2), and a chip (4) made of a sintered alloy containing diamond is provided in the notch (3). ) in this method of manufacturing a band for cutting hard materials, the band strip plate (1)
This method of manufacturing a band for cutting a hard material is characterized in that a current is passed between the tip (4) and the tip (4), and the two are welded and bonded by their electric resistance.