JPS5929371B2 - Automatic planting method of diamond grains - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for automatically implanting diamond grains, and more particularly to a method for automatically implanting diamonds into diamonds in surf ace sets for drilling rocks, carbon molds, etc. in the manufacturing process of drill bits.

In general, diamond drill bits are broadly classified into two types: surfactant diamond drill bits and imprignific diamond drill bits, depending on the state of diamond implantation in the bit.

As shown in FIGS. 1A and 1B, the Surf Eighth Scent Diamond Drill Bin, which is the object of the present invention, has diamonds only on the surface of the matrix according to certain rules determined by the conditions of the object to be cut. The diamond grains are planted with the diamond grains exposed on the surface of the matrix. Conventionally, the method of planting diamond grains into the carbon mold in the manufacturing process of Surface Sesotho Diamond Drill Bits was done manually for each grain, but an automatic method of planting diamonds according to Patent No. 884951 by the present applicant. With the disclosure of this device, significant labor savings have been realized to this day.

However, according to the conventional automatic diamond seeding method and device, the diamond grains to be planted are made conductive and then charged at high voltage, applying the principle of electromagnets that attracts opposite polarities and repels like polarities. In addition to requiring a high voltage generator, it is extremely effective for a 25-ring type drill bit as shown in Figure 1A, but it is extremely effective for a wire line type drill bit as shown in Figure 1B. There is a drawback that it is difficult to glue and plant. The object of the present invention is to
The present invention aims to overcome the drawbacks of animal planting and to provide an effective automatic planting method that is extremely simple to use and operate, and is not limited by the size of the diamond, the shape of the bit, etc.

The present invention includes the steps of: installing a carbon mold coated with adhesive in advance on the inner cylinder in the housing at 35 scheduled adhesion positions of the diamond grains; A step of placing a large number of diamond grains on a diamond pedestal, and introducing compressed air through a nozzle provided through a net into the opening at the bottom of the casing and the annular recess, and passing the air through a hole. a step of levitating the diamond grains on the diamond pedestal by the introduced compressed air; and a step of causing the floated diamond grains to move along a diamond guide provided at the center of the inner cylinder. The above object is achieved by an automatic method for planting diamond grains, which comprises the steps of guiding the diamond grains and adhering the diamond grains to the intended planting position of the carbon mold coated with the adhesive.

Embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a sectional view showing an apparatus for carrying out the method for automatically planting diamond grains according to the present invention. An inner cylinder 8 that supports a carbon mold 6 in which diamond grains 4 are to be planted is provided in a surrounding casing 2. The carbon mold 6 is supported by the inner cylinder 8, and its outer periphery is surrounded by the casing. It is in contact with body 2. FIG. 2 shows the case of a wireline type surf ace set diamond drill bit, in which adhesive 10 is applied in advance to the conical surface inside the carbon mold 6 at the position where the diamond 4 is to be planted. has been done. As this adhesive, a polymer resin such as gliptal resin to which acetone is added, or a mixture of vaseline and paraffin (2 to 8% by weight) is used. The upper part of the housing 2 is covered by an annular lid 14 having an opening 13. A hole 16 is attached to the lower end of the opening 13 provided approximately in the center of the annular lid 14, and serves as an outlet for compressed air 18 introduced from the bottom. An inlet 20 for compressed air 18 is opened at the bottom of the casing 2, and a partition wall 22vc defined in a funnel shape opens from the upper end of the inlet 20 to form a compressed air introduction chamber 2 inside the inner cylinder 8.
4 is formed. A diamond pedestal 28 having an annular recess 26 is provided at the top of the compressed air introduction chamber 24, and a plurality of nozzles 30 are provided at the bottom of the annular recess 26, communicating with the compressed air introduction chamber 24 through a net 32. There is. The diamond pedestal 28 is horizontally rotated by a rotating device 34 installed between the inner cylinder 8 and the housing 2. A conical diamond guide 36 is provided directly above the center of the diamond pedestal 28, and its top protrudes into the conical gap of the carbon mold 6. An automatic planting method using the automatic diamond grain planting device having such a configuration will be explained.

First, a large number of diamond grains 4 to be planted are placed on the annular recess 26 of the diamond pedestal 28. Next, a carbon mold 6 to which adhesive 10 has been previously applied only to the planting position of the diamond 4 is set between the inner tube 8 and the housing 2, and is covered and fixed with an annular lid 14 having an opening 13. Next, operate the air pressure adjustment valve 38 of the compressed air 18 to
The compressed air 18 is sent intermittently through the air. Next, the nozzle rotation device 34 is activated to rotate the diamond pedestal 28. Since the compressed air 18 is intermittently ejected from the nozzle 30 by such intermittent supply of compressed air 18 and the rotating diamond pedestal, the diamond grains 4 on the annular recess 26 of the diamond pedestal 28 are Repeated surfacing intermittently. Among the floating diamond particles 4, those that reach the bonding position where the adhesive 10 is applied are caught by the adhesive 10 and fixed onto the carbon mold 6. Among the floating diamond particles 4, those that hit the area other than the bonding position and the net 16 provided at the discharge opening 13IIC for the compressed air 10 fall naturally and are guided to the diamond guide 36 and return to the annular recess of the diamond pedestal 28. Returns to 26 VC and floats again with intermittent compressed air. The diamond planting work according to the present invention is completed when the diamond grains 4 are bonded to all the planned diamond bonding positions by repeated flotation, but in the present invention, the diamond grains 4 are bonded once by the subsequent intermittent flow of compressed air. The diamond grains 4 have a characteristic that they have directionality. That is, the diamond grains 4 are non-directional during the floating process, partly because the shape of the diamond is not uniform, and are non-directional even when initially bonded. However, once the diamond grains 12 adhered onto the carbon mold 6 are pressed against the mold surface by the subsequent constant flow of compressed air, and when the seeding is completed, they have an unusual and unique shape. Except for a small amount of diamond, each diamond grain 12 is planted in a substantially uniform posture with good directionality with respect to the excavation direction A, as shown in FIG. The reason is as follows.
Diamond grains 12 floated up by the compressed air B and arrived at or near the planting position where adhesive is to be applied.
Even if the tip of the diamond does not reach the adhesive 10 as shown in FIG. 4A, or even if the tip reaches the adhesive 10 as shown in FIG. 4B, the implantation state may be temporary. , Those with unstable postures and positions or postures that are subject to large air resistance due to the compressed air B blowing through are blown away by the following compressed air.

At the planned planting position where such diamond grains 12 have been blown away, the diamond grains that will arrive next will be waiting. Diamond particles 1 unstably adhered to adhesive 10
2, as shown in Figure 4C, if the object is in a position or posture that is pushed by the compressed air B toward the mold surface, it will be pushed more and more strongly against the mold surface by the following compressed air at that position. , the diamond grains are pressed to a stable position, and finally the diamond grains are in the most stable position as shown in Figure 3, that is, one tip of the diamond grains, which becomes the cutting edge, is in a good position along the mold surface in the trenching direction A. fixed in a fixed position.

Therefore, by adjusting the positional relationship between the mold 6, the nozzle 30, the diamond guide 36, etc., or adjusting the operating conditions such as the amount of compressed air, the pressure, or the intermittent time of air supply, it is possible to As a result, it is possible to obtain an appropriate state of diamond grain planting.

The carbon mold 6 that has been planted in this manner is removed from the automatic planting device, inspected and confirmed, and then sent to the next step to complete the automatic diamond planting work according to the present invention.

The time required for automatically planting diamond grains into a carbon mold according to the present invention is only about 60 seconds, and directional diamonds can be firmly planted in an extremely short time, significantly reducing work efficiency.

Example 1 A wire line type surf ace set diamond bit having a diameter of 76 Fm as shown in FIG.

The planting conditions in this case were as follows. Diamond particle size 1/19 karat Compressed air supply pressure Z5kg/Cd Same air supply amount 450t/- Nozzle rotation speed 100sec/transfer time
Planting time: 15 times for 30 seconds per 2 seconds Required time: 60 seconds This completes the planting of diamond grains with excellent directionality, and as a result of visual inspection, no defects can be found to proceed to the next process. Ta.

Example 2 Similar to Example 1, a diameter of 37rfr1n according to the invention
A wire line type Surf Ace set diamond drill bit of the same size is planted, and at the same time, the wire line type of the same size is automatically planted using the conventional method (high voltage charging method) and the diamond grain planting method has no direction. First, for three examples manufactured using a comparative method with inappropriate orientation, a diamond drill bit of the Surf Ace set was manufactured under the same conditions, and a comparative drilling test was conducted using an actual machine on homogeneous granite under the same conditions.

The drilling conditions were kept constant as shown below. Bit rotation speed 500
rpm drilling speed 5~6c! n/1!1i! L Bit supply pressure (1.5 to 80) The trench length (m) was compared.

The results of the comparative test are shown in FIG.

As is clear from Fig. 5, the straight line A obtained by the planting method of the present invention shows the same or better excavation performance with almost no subtraction compared to the conventional methods B and C using the high voltage charging method. On the other hand, the diamond used as a comparative example had a significantly longer digging length than the non-oriented BIT D, indicating that its life was significantly extended. It has become clear that this significantly contributes to extending lifespan.

As is clear from the above two examples, the automatic planting method according to the present invention achieved the following great effects. (a) Since diamond pretreatment unlike the conventional automatic planting method using high-voltage charging is not required, automatic planting can be performed in the same manner, and productivity can be significantly improved.

(b) Similar to the conventional automatic planting method using high-voltage charging, directionality can be imparted to the planted diamond grains, so cutting performance is improved and its lifespan is comparable.

(c) It can be particularly effectively applied to wire line type diamond drill bits, which have been difficult to use with conventional automatic planting methods.

(d) The device is extremely simple, the operating cost is low, and the planting operation is easy, and planting can be completed in an extremely short time of about 1 minute using a normal drill bit.

[Brief explanation of drawings]

1A and 1B show an example of a Surf Ace set diamond drill bit, A is a ring type, B is a perspective view showing a wire line type, and FIG. 2 is an automatic diamond planting suitable for carrying out the present invention. A schematic cross-sectional view illustrating the apparatus, FIG. 3 is an explanatory diagram illustrating a state in which diamond grains are oriented and stably planted by the automatic planting method of the present invention, and FIGS. 4 A, B, and B are respectively An explanatory diagram illustrating the unstable adhesion state during automatic diamond planting, FIG. 5 shows the bit A1 manufactured by the present invention.
It is a comparison diagram of the digging length due to the change in the bit supply pressure of the bit B manufactured by the conventional planting method and the comparison bit D whose Cl cutting blade has an inappropriate direction. 2... Housing, 4, 12... Diamond grains, 6... Carbon mold, Total...
Inner cylinder, 10... Adhesive, 13... Opening, 14... Annular lid, 16, 32... Not included, 18...・Compressed air, 20... Compressed air inlet, 24... Compressed air inlet, 26
......Annular recess, 28...Diamond pedestal, 30...Nozzle, 34...Rotating device, 36...Diamond guide.

Claims (1)

[Claims] 1. Installing a carbon mold coated with adhesive in advance on the inner cylinder in the casing at the planned bonding position of the diamond grains, and placing a rotatable diamond pedestal horizontally in the inner cylinder and having an annular recess. A step of placing a large number of diamond grains, and introducing compressed air through a nozzle provided through a net into the opening at the bottom of the housing and the annular recess, and supplying the air to the outside of the housing through the net. a step of discharging the diamond grains on the diamond pedestal by the introduced compressed air;
It is characterized by comprising the step of guiding the floating diamond grains along a diamond guide provided at the center of the inner cylinder and adhering them to the planned planting position of the carbon mold coated with the adhesive. A method for automatically planting diamond grains.