JPS5891287A - Drill bit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drill bit for rock drilling or geological excavation, and more particularly to a diamond drill bit having a head portion set with a shaped polycrystalline diamond sintered body.

In general, diamond drill pits include so-called surface-set pits, in which a large number of grains are attached to the surface of the bit head, and so-called impregnated bits, in which a large number of grains are dispersed in the matrix that makes up the bit head. However, as it has recently become possible to manufacture and supply polycrystalline diamond sintered bodies, drill bits using this as cutting edges have been manufactured and have become particularly effective in drilling oil wells. However, conventional polycrystalline diamond sintered bodies are generally manufactured and used while being lined with a cemented carbide alloy, and although they are extremely effective for low-hardness strata such as oil fields, It is not necessarily effective against hard rocks such as Also, the connection between the base metal and the Diamond Seven P sintered body layer! i! Ninth, the presence of a metallic component in the diamond sintered body is essential for the strong bonding strength required, and therefore, a relatively low temperature limit of 700°C or less is required when making the bit. There were drawbacks.

The purpose of the present invention is to eliminate the problems of the prior art,
It is an object of the present invention to provide a drill pit which has the same excavability in hard rock as above, and which eases temperature restrictions in making the pit.

However, this object is achieved by the present invention having the following gist.

That is, the invention of 1s1 has a head portion in which a plurality of polycrystalline diamond sintered bodies are embedded in a matrix metal, and this polycrystalline diamond P sintered body is a linear polyhedron, one surface of which is a rake surface. 4!And the rake angle between and is in the range of -30° to 300°! This is a typical drill pit.

Further, invention #I2 has a head portion in which a plurality of polycrystalline diamond sintered bodies are embedded in a matrix metal body, and this polycrystalline diamond sintered body is a polyhedron with the center of its apex angle. The line is a drill pit that is perpendicular to the head surface.

Furthermore, a third invention is a drill pit having a head portion formed by embedding a spherical polycrystalline diamond sintered body in an IJ sock.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view of a polycrystalline diamond sintered body 1 buried in a drill pit according to an embodiment of the present invention, and as shown in FIG. 1, it is a pentahedron of triangular prisms.

JIK 2 and 3 are cross-sectional views showing the state in which the pentahedral polycrystalline diamond/r sintered body 1 shown in FIG. Set the painter as the rake plane and set the rake angle θ(
(see Figure 3) as o°'. Also @3
In the figure, the sintered body IQrkJB is set as a rake surface, and the rake angle C is set to be negative. The arrow V in the figure indicates the direction of the earth cut^U resistance.

Nao's rake angle σ is -30'~30'% -25°~
It is preferable to set the angle at 25° from the viewpoint of improving excavability.

Next, an example of manufacturing this drill pit will be explained.

- A polycrystalline diamond sintered body formed into a triangular prism-like polyhedron with a height of 2.6 cm and an equilateral triangle with a side length of 4 cm as the base.
A carbon mold having a so-called 36 size core bit negative mold with an outer diameter of 36 cm and an inner diameter of 22 cm was made, and a fourth
-11 of the polycrystalline diamond sintered body with adhesive applied in advance to a predetermined position on the bottom surface 3 of Kazenmold WIi shown in FIG. (For example, Figure 1 1d or bc, etc.) are glued and fixed at nine locations so that the rake angles are all 130 degrees.

Then, 5μWO40% was added to the carbon mold as an aggregate.
Filled with 50f' and 5μwao%, 85IIIOu and 9
-1000 to 1100 binding material consisting of 81 and 6% Mn
A drill pit having a head portion in which a formed polycrystalline diamond sintered body was set by infiltration and sintering on the pit shank at ℃ was prepared. As a result of drilling tests on hard granite using the product of the present invention, it was found that the drilling rate and lifespan were comparable to conventional surface-set diamond drill pits and ingrained diamond drill pits, and that the drilling rate improved depending on the supply pressure. .

FIG. 6 is a sectional view of the surface layer of a drill pit according to the second embodiment of the invention. As shown in FIG. 6, in this embodiment, the center Ht of the apex angle is perpendicular to the head surface 4.

FIG. 7 is a sectional view of the surface layer of a drill pit according to the third invention, in which the polycrystalline diamond r sintered body 5 is spherical.

The drill pit of the present invention as described above is one in which a sintered diamond body is embedded in a matrix metal,
In the invention of Isl, the filament crystal diamond sintered body is a polyhedron, one surface of which is a rake surface, and the rake angle between the two is in the range of -30° to 30°. In the invention of Oku JI2, the polycrystalline diamond 7P sintered body is a polyhedron, and the center line of the apex angle is approximately perpendicular to the head direction. Furthermore Is3
In the invention, this polycrystalline diamond sintered body is made into a spherical shape. Therefore, unlike conventional diamond bits that require new diamonds P to be replenished each time they are reset, the product of the present invention replenishes new diamonds by simply distributing a new edge or apex angle to the surface each time it is reset. It is not a fool that can be reset and used one after another without any trouble, even after all the edges and apex corners have worn out.
By further collecting and conditioning the polycrystalline diamond sintered body shaped into a sphere, it can be used in the drill pit according to the third invention.

[Brief explanation of drawings]

Figure 1 is a perspective view of a molded polycrystalline diamond sintered body;
Figures 2 and 3 are side cross-sectional views of an example of a polycrystalline diamond sintered body set in figure 1s1, and Figure 4 shows a state in which the polycrystalline diamond sintered body is placed on the bottom of the negative mold of a carbon mold. 5 is a sectional view taken along the line ■-■ in FIG. 4, FIG. 6 is a side sectional view of a drill pit according to another embodiment, and FIG. 7 is a drill pit according to yet another embodiment. FIG. 1... Polycrystalline diamond 7P sintered body, 2... Matrix metal, 3... Bottom surface of carbon mold negative mold, 4...
... Head surface, 5... Polycrystalline diamond sintered body. Agent Tatsuyuki Unuma (and 2 others) Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 1 AY et al. Figure 6 Figure 7 Procedural amendment January 11, 1980 Patent application No. 186152 No. 2, Name of the invention Drill Bit 3, Relationship with the person making the amendment Patent applicant name Tone Pauling Co., Ltd. 4, Agent 5, Date of amendment order 7, Detailed explanation of the invention in the specification to be amended column. 8. Details of the amendment (1) "Surface Set Pid J" on page 2, line 6 of the specification is changed to t surface set bit 1. (2) "Bit Head Head" on pages 2, lines 6-7 of the specification. be changed to "r bit head". (3) In the 8th line of page 2 of the specification, ``implied bit'' is changed to ``r implemented bit''. that's all

Claims (3)

[Claims] (1) It has a head portion in which a plurality of polycrystalline diamond sintered bodies are embedded in a matrix metal, and this polycrystalline diamond sintered body is a polyhedron, one surface of which is a rake surface, and this rake A drill bit characterized in that the angle is in the range of -30° to 30°. (2) It has a head portion in which a plurality of polycrystalline diamond P sintered bodies are embedded in the matrix metal, and the polycrystalline diamond sintered bodies are polyhedral and the center line of the apex angle is on the head surface. is a drill bit whose elm is that it is vertical. (3) A drill bit with a head made of a spherical polycrystalline diamond sintered body drilled into a matrix metal.