KR20040080706A - Method for Manufacturing Segment for Diamond Tool - Google Patents

Abstract

PURPOSE: A method for manufacturing segments for diamond tool is provided to arrange double layers of diamond and enable diamond to be spatially arranged by arranging diamond in metal powder using cannula and increase productivity and mix various sized diamond grains by using metal powder having less amount of binder. CONSTITUTION: The method comprises a step of preparing metal powder(2); a step of charging the prepared metal powder into a mold; a step of arranging diamond(1) in the metal powder after adsorbing diamond onto cannula by suction force formed by suction of air through air suction hole at the other end of cannula by inserting one end of cannula in which air suction hole is formed into a diamond storage can in which diamond is stored; a step of preparing compact by molding metal powder in which diamond is arranged; and a step of sintering the compact, wherein diameter (D) of diamond and inner diameter (I) and outer diameter (O) of cannula satisfy the following relational expression 3, 1.2xI<=diameter (D) of diamond to be adsorbed<=1.2xO.

Description

Method for Manufacturing Segment for Diamond Tool

The present invention relates to a method for manufacturing a diamond tool used for cutting, drilling, and polishing brittle workpieces such as stone, brick, concrete, and asphalt, and more particularly, for diamond tools for arranging diamonds using a needle. A method for producing a segment.

Diamond is known to be the hardest material on earth, and it is used for cutting and grinding tools.

Artificial diamonds were invented in the 1950s, and segment-type cutting tips with irregularly arranged diamond grains as abrasives have also been used since the same time.

The artificial diamond (hereinafter referred to as "diamond") has become widely used in the field of stone processing for cutting and grinding stones such as granite and marble and in the construction industry for cutting and grinding concrete structures.

Generally, a segment type diamond tool is composed of a segment (cutting tip) in which diamond particles are distributed and a metal body (Core) in which the segment is fixed.

1 shows an example of a saw blade that is one of the diamond tools.

As shown in FIG. 1, the segmented saw blade 10 includes a plurality of segments (cutting tips) 12 fixed to a metal body 11 in the form of a disk, each segment 12 having a diamond. The particles 1 are randomly distributed.

2 shows an example of a segment type core bit used for drilling for stone and construction as one of the diamond tools.

As shown in FIG. 2, the segment type core bit 20 includes a plurality of segments (cutting tips) 22 fixed to the metal body 21, and the diamond particles 1 are randomly distributed. have.

3 shows an example of a segment type abrasive wheel (segment) used for polishing as one of diamond tools.

As shown in FIG. 3, the segment type abrasive wheel 30 includes a plurality of segments (polishing tips) 32 fixed to the bottom of the metal body 31, and each segment 32 includes diamond particles ( 1) are distributed randomly.

When the workpiece is cut using the diamond tool configured as described above, the diamond particles distributed in each segment are cut.

Powder metallurgy methods are generally used to fabricate these segments.

4 shows an example of a method of manufacturing a conventional cutting segment.

As shown in FIG. 4, in the related art, a powder mixed with diamond 1 and metal powder 2 is put into a molding mold 41 having a dimension of a cutting tip to be manufactured, and an upper punch 51 using a hydraulic press. ) By pressing the lower punch 52 to form a molded body 40 in which a large amount of diamond particles are randomly distributed as shown in FIG. 5, and then sintering the tongue to form a cutting tip.

In the case of the conventional method described above, the production of the segment is simple, but even if the same metal powder and the same diamond particles are used, since the diamond particles are randomly arranged, there is a problem in that the performance of the product varies due to the characteristics of each segment.

As a method to solve this problem, a technique of arranging diamonds at regular intervals and patterns in the cutting tip has been proposed.In the case of manufacturing the cutting tip, this technique eliminates the performance variation between tools and efficiently uses the diamond. Increase the cost and lower the price.

As described above, a technique of arranging diamonds at regular intervals and patterns in segments has been in progress since the early 1990's, and examples thereof include US Pat. Nos. 4925457, 55092910 and 5049165.

The U.S. Patents propose a method in which a diamond mesh is placed on a wire mesh in which diamonds are uniformly arranged on a flexible carrier made of a plastic metal powder and a metal fiber or a mixture thereof.

Another example is U. S. Patent No. 5620489, which includes a soft, easily deformed flexible SEDF having the property of being soft and easily deformable by using a mixture of a binder and a metal powder to form a process for mass production. ) Techniques for making preforms are described.

Further examples include US Pat. Nos. 5,380,390,5817204, and 5980678, which include a mask on which an adhesive substrate is placed on an SEDF preform and diamonds are constantly arranged on the mask; A technique that allows mass production by adhering mesh materials has been proposed.

However, the above techniques require the manufacture of many layers because of the multiple layers of thin layers, and moreover, the flexible carrier and SEDF preforms require a large amount of binder, and therefore at least 30 for degassing during sintering. There is a problem that it is not suitable for actual mass production because it requires more than a minute.

In addition, since the size of the mask body is determined, it is difficult to mix and use diamonds having different particle sizes.

The present inventors have conducted research and experiments to solve the problems of the prior art, and based on the results of the present invention, the present invention is to arrange the diamond in the metal powder using the diamond in the manufacture of the diamond tool segment This allows not only to arrange multiple layers at once but also to make spatial arrangements, and by using a metal powder having a small amount of binder, a degassing process is unnecessary, resulting in a shortening of sintering time. It is an object of the present invention to provide a method for manufacturing a segment for a diamond tool that can increase the productivity as well as use a mixture of diamonds of various particle sizes.

1 is an example of a conventional segment type saw blade in which diamond particles are randomly distributed.

2 is an example of a conventional segment type core bit in which diamond particles are randomly distributed.

3 is an example of a conventional abrasive wheel of the segment type in which diamond particles are randomly distributed.

4 is a schematic view showing a process for producing a molded article according to a conventional method.

5 is a schematic view of a shaped article molded according to the method of FIG.

6 is a schematic view showing a process of arranging diamonds in a metal powder according to the present invention, (a) is a step of charging a metal powder into a molding mold, (b) is a step of inserting a diamond powder into the metal powder after adsorption of diamond And (c) show the process of arranging the diamond in the metal powder by removing the adsorbing force.

7 is a schematic view showing an example of a reading in accordance with the present invention

8 is a schematic view showing an example of an adsorption device to which the needle of the present invention is fixed;

9 is a cross-sectional view taken along the line A-A of FIG.

10 is a schematic view showing an example of an adsorption device provided with a diamond reservoir;

Figure 11 is a schematic diagram showing the height change of the metal powder in the charging, forming and sintering process when manufacturing the cutting team according to the present invention, (a) is the height after the metal powder loading, (b) is the height after molding , And (c) represents the height after sintering

12 is an arrangement diagram showing the arrangement state of the diamond particles in the cutting surface of the cutting tips arranged diamonds according to the present invention, (a) is a straight array, (b) is a spatially inclined arrangement.

13 is an arrangement diagram showing the arrangement state of the diamond particles on the side surface of the cutting tip is arranged diamond according to the present invention, (a) is a constant interval arrangement, (b) is a high concentration arrangement of the cutting tip end portion And (c) shows the arrangement of different concentrations for each part of the cutting tip.

14 is a schematic view of a segment type saw blade with diamonds arranged in a pattern in accordance with the present invention;

15 is a schematic diagram of a segment type core bit in which diamonds are arranged in a pattern according to the present invention;

16 is a schematic view of a segmented abrasive wheel in which diamonds are arranged in a pattern in accordance with the present invention;

Figure 17 (a) is an example of a segment produced in accordance with the present invention

17 (b) is an example of an adsorption device for producing the segment of FIG. 17 (a).

Explanation of symbols on the main parts of the drawings

1 .. Diamond 2 .. Metal Powder

10,10a .. Soblade 20,20a .. Corebit

30.30a .. Polishing wheels 11,11a, 21, 21a, 31,31a .. Metal body

12,12a, 22,22a, 32,32a .. Segment 100 ..

101 .. Air suction hole 200 .. Adsorption device

210 .. Algorithm 211 .. Fixatives

212 .. Bottom of the Al Invading Government. . Through penetrating hole

220 .. Adsorption chamber 300 .. Diamond reservoir

310. . Upper part of reservoir 311 .. Immersion hole

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated.

The present invention comprises the steps of preparing a metal powder;

Charging the metal powder prepared as above into a molding mold;

Drawing diamonds by suction using a needle to arrange diamonds in the metal powder charged into the molding mold as above; And

It relates to a method for producing a segment for a diamond tool comprising the step of forming and sintering the diamond after arranging as described above.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

A preferred example of a method for manufacturing a diamond tool according to the present invention is shown in FIG. 6, which will be described below.

In order to manufacture a diamond tool according to the present invention, as shown in FIG. 6 (a), a metal powder 2 should be prepared and then loaded into a molding mold 61.

As the metal powder, one or two or more kinds of iron-based and non-ferrous metals such as Fe, Cu, Co, Ni, W, WC, Sn, CuSn, Ag, and P may be used, and their sizes may be several to several hundred μm. It can be used in the state of phosphorus biopowder and granules in which the biopowder is formed into a spherical shape of several hundred μm.

The molding mold that can be used in the present invention is not particularly limited, and any molding mold can be used as long as it is used in the field of diamond cutting tool manufacturing.

Next, as shown in Figs. 6A, 6B and 6C, the diamond stored in the diamond reservoir is sucked using a needle and then placed in a predetermined position in the metal powder charged into the molding mold. After placing the diamond attracted to the needle, the suction force should be removed to arrange the diamond at a predetermined position in the metal powder, which will be described in detail below.

It is used for medical or industrial purposes.

The present invention applies the diamond to the diamond array in the manufacture of diamond tools, and furthermore, the diamond array is used for the diamond in which the structure is more appropriately configured for the diamond array.

An example of the teachings of the present invention is shown in FIG.

As shown in FIG. 7, the needle 100 includes an air suction hole 101 therein to suck air through the air suction hole 101 to adsorb the diamond 1.

According to the present invention, it is important to properly select the inside diameter, the outside diameter, and the difference between the inside diameter and the outside diameter (thickness of the needle) according to the size and state of the diamond in order to inhale the diamond more appropriately.

As shown in FIG. 7, the diamond diameter is D, the outer diameter of the needle is O, the inner diameter of the needle is I, and the minimum diameter of the diamond is D _min and the maximum diameter is D _max. The diamond diameter (D) that can be adsorbed on the surface should be larger than the inner diameter (I) of the needle.

However, since diamond is a polygonal structure with an edge, the diamond diameter may not always be absorbed by the needle as long as the diamond diameter is simply larger than the inside diameter of the needle.

According to the researches and experiments of the present inventors, it is preferable that the inside diameter (I) of the needle and the minimum diameter (D _min ) of the diamond satisfy the following relation (1) in order for the diamond to be adsorbed without being caught in the air suction hole of the needle. Could confirm.

[Relationship 1]

D _min ≥1.2 × I

If the minimum diameter (D _min ) of the diamond is smaller than the value of the relation (1), the number of diamond particles to be inserted into the suction hole of the needle is so large that the desired diamond arrangement is not achieved.

In addition, the diameter (D) of the adsorbable diamond is also related to the outer diameter (O) of the needle.

When diamond grains become too large relative to the outer diameter of the needle, the diamond may fall off at the tip of the needle due to the resistance of the metal powder when the diamond is adsorbed and arranged inside the metal powder.

Therefore, in order to make sure that the diamond is adsorbed and arranged through the needle, it is preferable that the diamond maximum diameter D _max and the outer diameter O of the needle satisfy the following expression (2).

[Relationship 2]

D _max ≤1.2 × O

According to the above relations (1) and (2), it is understood that when the diamond to be adsorbed is selected, the diameter (D) of the diamond particles and the size of the needle satisfy the following relation (3).

[Relationship 3]

1.2 × I ≤ Diamond diameter to be adsorbed (D) ≤ 1.2 × O

An example of a preferable relationship between the outer diameter and inner diameter of the needle and the size of the diamond which can be more preferably applied to the present invention is shown in Table 1 below.

Gage Outer Diameter (㎛) Inner diameter (㎛) Diamond available Granularity Size (μm) 22G 710 410 25/30 600-770 30/35 509-650 23G 640 330 30/35 509-650 30/40 429-650 25G 510 250 35/40 429-541 40/50 302-455 27G 410 200 40/50 302-455 50/60 255-322 30G 300 150 50/60 255-322 60/80 181-271 32G 230 100 60/80 181-271 80/100 151-197 100/120 127-165

In addition, the thickness of the needle also affects the diamond adsorption and arrangement possibilities.

The thickness d of the pill is defined by the following equation (4).

[Relationship 4]

d = (O-I) / 2

Where O is the outer diameter of the needle and I is the inner diameter of the needle.

If the thickness (d) of the needle is too thin in a needle having a constant outer diameter, the strength of the needle may be low, and the needle may bend when the diamond is arranged.

In addition, if the thickness (d) of the needle is too thick, that is, the inner diameter is too small in the pellet having a constant outer diameter, the air intake area for adsorbing the diamond is small, the adsorption is not made properly.

The needle configured as described above is coupled to the adsorption device 200 as shown in FIG. 8.

The adsorption device 200 includes an altitude fixing unit 210 fixed to the altitude 100 by a fixing agent 211 such as a polymer compound and an adsorption chamber 220 to which the altitude fixing unit 210 is coupled. It is configured to include.

The adsorption chamber 220 is connected to a vacuum pump (not shown) that makes the inside of the vacuum state.

The bottom portion 212 of the reading fixing portion 210 is formed of a plate-like member, preferably a plate-shaped member of 0.5 mm to 5 mm, and the bottom portion 212 has a constant spacing and pattern as shown in FIG. As a result, a penetrating through hole 212a having the same diameter as the outer diameter of the pen is formed.

The plate-shaped member may be a metal plate, an acrylic plate, or the like, and the reading through hole may be processed by using laser or drilling.

The plate-shaped member may be made of one sheet or a plurality of sheets.

The fixation of the pill is performed by inserting the pill vertically into the pierce through hole to fix it using a fixing agent 211, preferably, a fixing agent made of a high molecular compound such as urethane or rubber.

At this time, one end of the pill 100 is located in the adsorption chamber 220, and the other end thereof is coincided with the outer surface of the bottom portion 212 of the pill fixing part or protrudes from the surface by a predetermined length (h). It is desirable to fix the readings.

The protruding length (h) may vary depending on the specification of the needle, but according to the researches and experiments of the present inventors, about 0 to 20 mm is preferable. If the length is longer than this length, it is difficult to become straight or metal powder. It becomes inconvenient to handle when arranging the diamond particles in.

In particular, when the protrusion depth is within the minimum outer diameter of the diamond to be adsorbed, it is possible to arrange the diamond on the surface of the segment.

It is preferable that the vacuum pump not only prevents the intake of air but also discharges the air to prevent clogging of the air suction hole of the pellet 100 due to the metal powder which may occur after the diamond is arranged in the metal powder.

On the other hand, the adsorption of diamond at the end of the needle is formed by inserting the needle 100 into the diamond reservoir 300 in which diamond particles are stored, as shown in FIG. 10, and then sucking air through the air suction hole of the needle. It is caused by the air suction force, where many diamond particles can stick to one tip.

This is because diamonds are not perfectly spherical, resulting in narrow gaps between the diamond particles and the tip of the needles, which can cause the diamonds to stick to each other due to the air suction.

Therefore, the storage container 300 is preferably configured to adsorb only one diamond particle at the end of the needle when the diamond particles are adsorbed.

As shown in FIG. 10, the preferred storage container 300 is configured to have a sealed structure in which a plurality of egg receiving holes 311 capable of penetrating the needle are provided at an upper portion 310 thereof.

The diameter (X) of the immersion hole (311) is preferably selected such that the following relation (5) is satisfied with respect to the minimum diameter (D _min ) of the diamond in one particle size and the outer diameter (O) of the immersion.

[Relationship 5]

1.2 × O <X <2D _min

When the diameter X of the immersion hole 311 is set to satisfy the relation (5), the immersion hole is smaller than the size of two diamonds and larger than the diameter of the needle, so Only diamonds will be attached.

On the other hand, if the thickness (t) of the upper portion of the reservoir is too thin, several diamonds are instantly adsorbed at the tip of the needle, and if the thickness is too thick, the diamond (t) may be caught in the needle receiving hole. Is preferably set to meet the condition of the following relation (6) in relation to the minimum diameter (D _min ) of the diamond.

[Relationship 6]

D _min <t <2D _min

As shown in FIG. 10, the needle attached to the adsorption device is inserted into the reservoir 300 in which the diamond is stored, and the vacuum pump is operated so that the inside of the adsorption chamber 220 is in a vacuum state. Next, as shown in Figs. 6B and 6C, the diamond adsorbed on the needle is placed at a predetermined position in the metal powder charged into the molding mold.

In order to adsorb diamond in the needle, the suction flow rate is at least well adsorbed, but the air suction flow rate is variable to arrange inside the metal powder. The larger the maximum flow rate, the sooner the maximum vacuum degree is reached.

In other words, when the diamond is about to drop off at the end of the reading, if the maximum flow rate is large, the diamond will be held quickly so that it cannot fall.

Therefore, when the number of diamonds to be arranged in the metal powder is determined, a vacuum pump having an appropriate capacity should be selected.

According to the researches and experiments of the present inventors, it is preferable that the relationship between the number of diamonds (N) to be arranged in the metal powder and the vacuum pump capacity (Q) satisfies the following expression (7).

[Relationship 7]

N≤Q / 0.2

As described above, the diamond adsorbed on the needle is placed at a predetermined position in the metal powder charged into the molding mold, and then, as shown in FIG. 6 (d), the diamond is removed from the needle by removing the suction force. Arranged at a predetermined position in the powder.

The diamond tool segment is manufactured by arranging diamond in a metal powder as mentioned above, shaping | molding, removing a molded object, and sintering this molded object.

When the diamond is arranged in the state where the metal powder is charged into the molding mold as in the present invention, the position of the diamond is changed by the thickness change of the segment after molding and after sintering.

Therefore, it is preferable to arrange the diamond at the position in the metal powder in consideration of the change in the position of the diamond, which will be described with reference to FIG.

Since metal powders are different in size and shape depending on their type, the apparent density (ρ) is different and thus the filling degree is different.

In other words, when compressed according to the filling degree or the apparent density of the metal powder, even if the metal powder of the same volume is a different filling height.

As shown in (a) of FIG. 11, the diamond (1) layer is arranged at a depth H by using a needle on a metal powder filled with a filling height T in the molding mold.

When the metal powder is molded, as shown in FIG.

When the molded body is sintered at high temperature and high pressure, as shown in FIG. 11 (c), the sintered body has a cross-sectional area A and the sintered body density is rho ", and the thickness is T", which is thinner than T 'and the depth of the diamond layer is also increased. Change to H ".

Therefore, when designing the dimension T "of the segment and the position H" of the diamond array layer, it is desirable to adjust the depth H for inserting the needle into the metal powder according to the characteristics of the metal powder.

When fabricating a segment of metal powder having a mass of W, having a cross section A, a thickness T ", and a diamond array layer having a position H", the depth H for inserting a needle into the metal powder can be obtained by the following equation (8). have.

[Relationship 8]

H = W / Aρ (ρ: apparent density)

H "= W / Aρ" (ρ ": Sintered compact density)

H = (ρ "/ ρ) × H"

T = (ρ "/ ρ) × T"

Fig. 12 shows a diamond particle array which can be arranged according to the present invention, as seen from a cut surface (upper segment).

FIG. 12 (a) has a form distributed in a straight line on the inside and the surface of the cutting tip, and FIG. 12 (b) shows a pattern arrangement so as to have a spatially constant slope inside the cutting tip.

In addition, Fig. 13 shows examples of the distribution of diamond particles arranged on the side of the cutting tip, and Fig. 13 (a) shows that the diamonds are distributed at equal intervals, and Fig. 13 (b) shows the center portion for reinforcement at both ends. It shows that the distance between the particles and the end of the different adjustment, and Fig. 13 (c) shows an arrangement in which diamonds are united into parts in one segment.

The shape of the diamond particles can be any shape by changing the arrangement of the needles.

In the case of combining FIG. 12 and FIG. 13, diamond particles may be arranged in various shapes on the cutting tip.

Examples of diamond tools made in accordance with the present invention are shown in FIGS. 14, 15 and 16, respectively.

Fig. 14 shows a cutting and cutting saw blade made in accordance with the present invention, wherein the saw blade 10a comprises a metal body 11a and a segment (cutting tip) 12a, wherein the diamond particles have a uniform pattern. Are arranged.

15 shows a drilling core bit made in accordance with the present invention, which core bit 20a comprises a metal body 21a and a segment (cutting tip) 22a, the segment 22a being constant. Curved in radius, diamond particles are arranged in a uniform pattern.

16 shows a polishing abrasive wheel manufactured according to the present invention, which includes a metal body 31a and a polishing tip 32a, and diamonds are arranged in a constant pattern.

The present invention will be described in more detail with reference to the following Examples.

Example 1

In order to make a saw blade segment in which a diamond arranged in a regular pattern is inclined 3.15˚ to the space inside the segment (cutting tip), 350G according to the size of the diamond is used using a 25G (inner diameter: 250 µm, outer diameter: 510 µm) needle. Diamond was adsorbed and arranged in a metal powder. At this time, the results of diamond adsorption were investigated for the vacuum suction flow rate and the diamond particle size, and the results are shown in Table 2 below.

At this time, the thickness of the upper portion of the diamond reservoir was processed to 550㎛, the needle receiving hole diameter 700㎛.

Diamond particle size vacuum suction capacity 302-455㎛ 429-541㎛ 509-650㎛ 30 ℓ / min Diamond-adsorbed immersion 298/350 274/350 261/350 Diamond water absorbed immersion 23/298 0/274 birds 0/261 60ℓ / min Diamond-adsorbed immersion 326/350 305/350 288/350 Diamond water absorbed immersion 29/326 0/305 0/288 90ℓ / min Diamond-adsorbed immersion 350/350 350/350 350/350 Diamond water absorbed immersion 35/350 0/350 0/350

As shown in Table 2, the adsorption of diamond at the tip of the needle is related to the vacuum suction flow rate, and the adsorption of a plurality of diamonds at the tip of the needle is related to the diameter of the needle through-hole processed at the top of the diamond reservoir.

Since the adsorbed penetrating through hole adsorbs 350 diamonds, the total adsorption is possible only when the vacuum suction flow rate is 90 l / min or more as described above. As the vacuum suction flow rate decreases and the diameter of the diamond increases, the diamond adsorbs. It can be seen that the number of the penetrating through-holes becomes small.

Since the diameter of the needle receiving hole in the upper part of the diamond reservoir is 700 μm, in the case of a small diameter diamond having a diamond size of 302 to 455 μm, several are adsorbed to the tip of the needle, and this phenomenon occurs more as the capacity of the vacuum pump increases. .

According to the above results, it can be seen that one diamond is adsorbed in one needle when the diamonds having sizes of 429 to 541 µm and 509 to 650 µm are adsorbed at a vacuum suction flow rate of 90 l / min.

Example 2

After the diamond adsorbed in Example 1 was arranged inside the metal powder, the number of diamonds correctly arranged in the metal powder and the number of diamonds arranged in plural were investigated, and the results are shown in Table 3 below.

Diamond particle vacuum suction flow rate 302-455㎛ 429-541㎛ 509-650㎛ 30ℓ / min Number of diamonds arranged correctly 150/298 148/274 137/261 Number of diamonds arranged in plural 0/150 0/148 birds 0/137 60ℓ / min Number of diamonds arranged correctly 306/325 305/305 229/288 Number of diamonds arranged in plural 29/326 0/305 0/259 90ℓ / min Number of diamonds arranged correctly 325/350 350/350 332/350 Number of diamonds arranged in plural 10/325 0/350 0/332

As shown in Table 3, it can be seen that the whole of the diamond adsorbed on the needle is not correctly arranged in the desired position inside the metal powder.

This is because when the vacuum suction flow rate is small or the diameter of the arranged diamond is much larger than the outer diameter of the needle, the diamond falls out during the insertion of the needle into the metal powder to align the diamond.

If the vacuum suction flow rate is 30ℓ / min, the diamond is not arranged at the intended position because the adsorption force is too small.In the case of diamonds of 509-650㎛ size, it is too larger than the 25G needle, so it is inserted by the interference of metal powder In the process, he was eliminated.

In the case where the diamonds with a vacuum suction flow rate of 90 l / min are arranged in a size of 302-455 μm, the adsorption force of the needle that adsorbs a plurality of diamonds that existed when the diamond is adsorbed is small so that when the diamond is inserted into the actual metal powder It was dropped and could not be arranged in place, and there were two diamonds arranged in one position.

As a result, it can be seen that it is desirable to determine the size of the needle, the capacity of the vacuum pump, and the size of the needle receiving hole formed in the upper portion of the diamond reservoir according to the size and number of diamonds to be adsorbed.

(Example 3)

After sintering using Fe powder having an apparent density of 2.3 g / cc and a sintered body density of 7.85 g / cc as shown in FIG. 17 (a), the length was 40 mm, the width was 6.5 mm, the thickness was 3.2 mm, In order to fabricate the segments having a slope of 3.15 ° having diamonds arranged from 0.5 mm (t ') to 2.7 mm (t ") deep, the adsorption device as shown in FIG. Segments were prepared by arranging the diamonds under the conditions of insertion depth and insertion direction gradient.

At this time, the vacuum suction flow rate was 90 L / min, and the diamond size was 429-541 µm.

The diamond arrangement in the segment manufactured as described above was examined, and the results are shown in Table 5 below.

Condition Insertion depth Tilt Arrangement h ' h " One 1.7mm 3.9 mm 3.15 ° 2 1.7mm 7.0mm 7.5 ° 3 3.0mm 10.5mm 10.6 ° 4 1.7mm 9.2mm 10.6 °

Condition Diamond arrangement depth The slope of the diamond arranged inside the segment t ' t " One 0.5mm 1.15mm 0.93 ° 2 0.5mm 2.06mm 2.23 ° 3 0.9mm 3.1mm 3.15 ° 4 0.5mm 2.2 mm 3.15 °

As shown in Table 5, when the segment is manufactured under the condition 4 of Table 4, it can be seen that the desired diamond arrangement can be obtained.

This result implies that the insertion depth of the needle should be set in consideration of the sintered density and the apparent density of the metal powder when the segment is manufactured.

Example 4

The number of diamonds arranged in the metal powder in the same manner as in Example 1, except that the size of the needle (gauge) and the size of the diamond were changed as shown in Table 6, Was investigated and the results are shown in Table 6 below.

At this time, the vacuum suction flow rate was 90 l / min, the top of the diamond reservoir was 550㎛, the size of the immersion hole was 855㎛, and a total of 350 diamonds were adsorbed.

Condition One 2 3 Diamond Gage 429-541㎛ 455-541㎛ 509-650㎛ 22G 336/350 343/350 350/350 23G 350/350 350/350 350/350 25G 350/350 350/350 332/350 27G 329/350 329/350 323/350

As shown in Table 6, in conditions 1 and 2, in the case of 22G, the diamond is larger than the inner diameter of the needle, but since the diamond surface is not a perfect circle, the diamond is not arranged and is arranged according to the state of the crystal surface.

In particular, 22G of condition 1 has a relationship of d = 1.01 × I (d: diamond minimum particle size) in relation to the diamond needle inner diameter I and the diamond minimum particle size d, and 22G of condition 2 is d = 1.11 × I. .

However, 22G of condition 3 in which all the diamonds were arranged in place had a relationship of d = 1.24 × I.

In the case of 27G in condition 1 and 2, and 25G and 27G in condition 3, the diamond size was excessively larger than the outer diameter of the needle, resulting in diamond dropout when inserted into the metal powder, resulting in diamonds not arranged in place. .

In the case of 27G in condition 1 and condition 2, the relationship between the outer diameter O and the diamond maximum diameter D was found to be D = 1.32 × O, and in the case of 25G and 27G in condition 3, D = 1.27 × O and D = 1.59, respectively. There was a relationship of × O.

From the above results, it can be seen that the size of the needle should be appropriately selected according to the size of the diamond particles to be arranged.

As described above, the present invention can arrange the diamond at the desired position by arranging the diamond particles in the metal powder by using a notice in the manufacture of the segment for the diamond tool, thereby improving the life and cutting efficiency of the cutting tip It is.

In addition, the present invention can be arranged regardless of whether the metal powder is in the bio-powder or granule state, can be used to mix diamonds of different particle size, can improve the productivity because no deparaffin process is required It works.

In addition, the present invention can be arranged in a variety of diamonds within the segment, it can be applied more effectively to the manufacturing process of diamond tools such as saw blades, core bits, grinding wheels of the segment type.

Claims (13)

Preparing a metal powder; Charging the metal powder prepared as above into a molding mold; Insert one end of the needle with the air suction hole inside it into the diamond reservoir where the diamond is stored, and adsorb the diamond to the needle by the suction force formed by the suction of air through the air suction hole at the other end of the needle. Arranging diamond in the metal powder; Forming a metal powder in which diamonds are arranged as described above to produce a molded body; And sintering the molded body. The method of manufacturing a segment for a diamond tool according to claim 1, wherein the relationship between the diamond diameter (D), the inner diameter (I) of the needle, and the outer diameter (O) satisfies the following expression (3). [Relationship 3] 1.2 × I ≤ Diamond diameter to be adsorbed (D) ≤ 1.2 × O The method for manufacturing a diamond tool segment according to claim 1 or 2, wherein an immersion hole having a diameter (X) satisfying the following relational expression (5) is formed on an upper portion of the diamond reservoir. [Relationship 5] 1.2 × O <X <2D _min [Wherein, O: outer diameter of needle, D _min : minimum diameter of diamond] 4. The method according to claim 3, wherein the upper thickness t of the diamond reservoir is set so as to satisfy the condition of the following relation (6) with respect to the minimum diameter D _min of the diamond. [Relationship 6] D _min <t <2D _min The metal powder according to claim 1 or 2, wherein the metal powder is one or two or more selected from an iron-based and non-ferrous metal group consisting of Fe, Cu, Co, Ni, W, WC, Sn, CuSn, Ag, and P. Method for producing a segment for diamond tools, characterized in that The method of manufacturing a segment for diamond tools according to claim 5, wherein the metal powder is a granule of several to several hundred micrometers of raw powder or granules formed into a spherical shape of several hundred micrometers. The method for producing a segment for diamond tools according to claim 1 or 2, wherein the diamond is arranged at a constant height inside the segment. The method for producing a segment for diamond tools according to claim 1 or 2, wherein the diamond is arranged obliquely inside the segment. The method of manufacturing a segment for diamond tools according to claim 1 or 2, wherein the diamond is arranged to have a pattern inside the segment. The method of manufacturing a segment for diamond tools according to claim 1 or 2, wherein the diamonds are arranged at different concentrations. The method for producing a segment for diamond tools according to claim 1 or 2, wherein the segment is a saw blade segment. The method for producing a segment for diamond tools according to claim 1 or 2, wherein the segment is a segment for core bits. The method for producing a segment for diamond tools according to claim 1 or 2, wherein the segment is a segment for a polishing wheel.