US2303046A

US2303046A - Method and means for making diamond drill bits

Info

Publication number: US2303046A
Application number: US441407A
Authority: US
Inventors: Jesse L Havlick
Original assignee: Individual
Current assignee: Individual
Priority date: 1942-05-01
Filing date: 1942-05-01
Publication date: 1942-11-24
Anticipated expiration: 1959-11-24

Description

' Nov.A 24, 1942.y L HAyLlcK 2,303,046

ETHOD AND MEANS FOR MAKING DIAMONDDRILVL BITS Filed' lay '1, .1942 a'sheets-sneer 1 riff v Inventorl ttorney Nav. 24, 1942.. 'J.'|. HAVLICK 2,303,045 METHOD AND MEANS .VFORVMAKING DIAMOND DRILL r'rs Fiied may 1. 1942 :s sheets-Sheep 2 Nv 24. 1942. J. 1. HAvLlcx 2 ,3035046 METHOD AND MEANS FOR MAKING DIAMOND DRILL IaII's Fn'ed lay 1,l 1942 s 'sheets-sheer vs' Inventor dfssf L' HAM )6K like parts throughout,

' Patented Nov. 24, 1942 METHOD AND MEANS FOB MAKING DIAMOND DRILL BITS :me L. annex, spouse, wash. Applicashun 1, mz, serai N0. 441.401

(ci. zz`1zz 7Claims.

'I'he presentl invention relates to new and useful improvements in method and means for making rotary diamond drill bits for earth boring. and for making other diamond cutters and tools.

H eretofore the practice oi setting diamonds as cutters in industrial tools has been a slow and tedious method done principally by hand and this, of course, is expensive as it is necessary to drill the hole the proper size and depth for the diamond, setting the diamond inthe hole .by

hand, andv then drawing the metal around the stone by means of calking which makes it impossible for the hand-setter to apply exactly the same amount .of pressure to the stone on all sides, which is very important in avoiding putting extensive stresses on the stone which may cause fractures or breaksbefore the stone is ever used.

Also a method of setting the diamonds has been employed by casting the same in slugs, or molten metal, but because of the difference in specific gravityof the diamond, it is very dimcult to noia the diamond inposition while casting. This method has also presented diiilculties in eliminating so-called iloatingf which occurs when the diamond has raised 'in' the molten metal before it has properly set.

Accordingly, it is an object of the present invention to overcome the'dimculties above explained and to this end I have provided a method and apparatus for setting the diamonds by providing a temporary mold. and inverting the mold with the diamond held in position therein onto powdered metal placed in a mold on top of the bit blank and fusing the metal and subjecting the -same to predetermined pressure `toy produce a strong connection thereof with the bit blank and in which the 'diamond will be rmly embedded.

A further object is to provide 'a method and means ofsetting Adiamondsin drill bits andthe like which are emcient and reliable in performance, relatively inexpensive to use and other-- wise well adapted for the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, .reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to and in which: plan view of the mold on purposes for which the Figure 1 is a top diamond holder.

Figure 2 is a side elevational view thereof.

Figure 3 is a sectional view taken substantially oxialincS-lofFigure Figure 4 is a vertical sectional view of the suction device for-holding the diamonds in position -in the mold or holder 4 v /hile the diamonds are temporarily secured in position in the mold.

Figure 5 is a side elevational view of a comr pleted diamond bit constructed in accordance with my invention.

Figure 6 is a vertical sectional view thereof. Figure 'l is anend elevational view. A Figure 8 is a vertical sectional view of the fusing mold. f

Figure 9 is a sectional view taken substantially on a line 9-9 of Figure 8.

Figure l0is a front elevational view of the combination electro-hydraulic pressure fusing or sintering machine.

Figure 11 is a side elevational view thereof, and Figure 12 is a sectional view taken substantially on a linen-I2 of Figure l0. 1

Referring now to the drawings `in detail, thenumeral l designates a diamond-holding mold or cup-having an annular channel l formed therein l within whichthe diamonds, indicated at 'l in Figure 4'of the drawings, are placed in a desired position. the bottom oi' the channel I having openings l therein to 'subject the diamonds to suction from a suction chamber I in which the l mold l may be positionedv and supported in its upper portion on brackets IO, the center portion of the chamber I being closed by a cap il. A 'suction pipe I! is attached to the chamber 9 for `:resting the desired suction in the chamber from a suitable source of power.

The diamonds are then sprayed with a suitable quick-drying adhesive such as collodion, shellac,

lacquer or glue, this being a temporary operation Y to hold the diamonds in the mold while handling; The mold, with the diamonds positioned therein, is then 'placed in an inverted position in a combined fusing and pressure device illustrated in detail in Figures 8 and 9 of the drawings. and

comprises a bottom section I3 of conductive l. material including an upstanding tubular post Il which is internally threaded for threadedly receiving the bit blank il, the bit blank having lateral openings It adjacent its upper edge. g

Positioned inthe upper portion of the bit blank is a' core II of non-conductive material which may be made of bone aah, plaster of Paris.. or

refractory brick material, and surrounding the upper portion of the bit blank andthe upper portion of the tubular bit-blank sectional lining sleeve Il of material similar to the core i1. A retaining collar Il is then placed over the lining Il.

holder I4, is a depending upon molten metal to enter the aperturev Between the core I1 and the lining I8 is placed a quantity of powdered metal 20 screened to about 200 mesh, the powdered metal being placed on top of the bit blank I5 and on top of the powdered metal is inverted the diamond holding mold 5.

The powdered metal may be a suitable alloy, the type of material the finished bit is to be used for boring.

On top of the mold 5 is placed the upper section 2l fof the fusing device which has its .lower end extending downwardly into the sectional lining I8 for bearing against the mold 5, the

cause embedding of the diamonds therein and adherence of the material to th`e stock.

3. A method of making diamond cutters comprising placing the diamonds in an open holder ence of the material to section 2l likewise being of conductive material. i

Connected to the section ber 22 and connected to the lower section I3 is a

terminal member

2,3, said terminals leading to a suitable source of direct current.

The fusing device is then placed in a hydraulic press designated generally at 24 and includes 2I is a terminal mem-- a base 25 having a'pair of upstanding rods 26 rising therefrom on which is slidablymounted the lower pressure plate 21 on which the -Ifusing device I3 is supported, the upper ends of -the rods 26 having an upper pressure plate 28 attached thereto and whichengages the top of the section 2| of the fusing device I3. The hydraulic cylinder 29 is supported on the base 25 and from the top of the cylinder projects the plungeril for engaging the underside ofthe lowerpressure plate 21. A feed pipe 3| leads from the cylinder 29 to a suitable source of hydraulicv pressure whereby the desired pressure may be subjected to the metal powder 20 and at the same time a .heavyV electric current of high amperage and density is transmitted to the upper and .lower sections of the bit holder through the

terminals

22 and 23 which then fuses the powdered metal and causes the diamonds to become embedded therein. The fusing action also causes the I6 to firmly anchor the csaine to the bit.

After the bit holder and bit have been cooled, the diamond holder 5 is then removed and the bit is ready for use.

Having thus described claim is:

1. A method of making diamond cutters comprising temporarilysecuring the diamonds in an open mold, inverting the mold on metal, and

the invention A what I monds therein.

2. A method of makingdiamond cutters corn.-Y prising placing the diamonds in an open holder mined number of diamonds against vfusing the metal to cause embedding .of the dia-*jV and coating the'diamonds with an adhesive to s55 temporarily secure the diamonds, in position in the holder, inverting the holder on a cutter stock, interposing fusible .material between the, diamonds and the stock, and fusing the material to and coating the diamonds with an adhesive to temporarily secure the diamonds in position in the holder, inverting the holder on a cutter stock, interposing fusible material between the diamonds and the stock, subjecting the diamonds and the stock to va compressing action against the material, and fusing the material to cause embedding of the diamonds therein and adherthe stock. r

4. A method of making diamond cutters comprising placing the diamonds in an open holder and coating the diamonds with an adhesive to temporarily secure the diamonds in position in the holder, inverting the holder on a cutter stock, placing powdered metal between the diamonds and the stock,'and fusing the metal to the diamonds and the stock.

5. A method of making diamond cutters comprising placing the diamonds in an open holder and coating the diamonds with an adhesive to temporarily secure the diamonds in position in the holder, inverting the holder on a cutter stock, placing powdered` metal between the diamonds and the stock, compressing the metal between the diamonds and the stock, and fusing the metal to the diamonds and the stock. 6. vMeans for making cutting tools comprising an open holder adapted to contain a predetermovement in the holder in an exposed position, a fusing mold comprising upper and lower electric conductors, said lower conductor being adapted for supporting a tool stock, and for receiving powdered metal placed in the mold on the upper edge of the stock to be fused to the stock, said holder being positioned on top of the metal in an inverted position withthe diamonds in contact with the metal, and means for compressing the diamonds and stock against the metal.

'1. Means for making cutting tools comprising an open holder adapted to contain a predetermined number of diamonds against movement in the holder in an exposed position, .a fusing mold comprising upper and lower electric conductors, said lower conductor being adapted for supporting a tool stock,- and for receiving powdered metal placed in the mold on the upper edge of the stock to be fused to the stock, said holder being positioned on top of the metal in an inverted position with the diamonds iny contact with the metal, and means for exerting pressure against the conductors for compressing the metal between the diamonds and stock.

JESSE L. HAVLICK.