CN102275228B - Brazing diamond core drill bit - Google Patents
Brazing diamond core drill bit Download PDFInfo
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- CN102275228B CN102275228B CN 201110204528 CN201110204528A CN102275228B CN 102275228 B CN102275228 B CN 102275228B CN 201110204528 CN201110204528 CN 201110204528 CN 201110204528 A CN201110204528 A CN 201110204528A CN 102275228 B CN102275228 B CN 102275228B
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Abstract
The invention relates to a brazing diamond core drill bit which comprises a drill bit substrate and a barrel-shaped drill bit, wherein the drill bit substrate and the drill bit are coaxially arranged; and the drill bit substrate is divided into an upper rod body and a lower rod body, one end of the upper rod body is axially fixedly connected with the inner end of the lower rod body, and the otherend of the upper rod body is used for being connected with an electrical drilling machine. The brazing diamond core drill bit is characterized in that the edge of the outer end of the drill bit is provided with a plurality of drill teeth, the drill teeth are arranged discontinuously, a U-shaped groove is arranged between two adjacent drill teeth, the drill teeth are in the shape of a circular arc, and diamond grits are welded on the surfaces of the drill teeth in a brazing mode. The brazing diamond core drill bit provided by the invention has the advantages of high cutting efficiency and longservice time, and can be applied to the drilling and coring operations of nonmetal materials such as concrete, stones, glass and ceramics and the like and metal materials such as iron and aluminum and the like.
Description
Technical field
The present invention relates to a kind of drill bit, more particularly, the present invention relates to a kind of diamond thin-wall drill bit.
Background technology
Diamond bit is mainly used in punching at hard articles such as pottery, glass, the case hardness of these article is than higher, adopt common steel drill bit to punch normally, because diamond bit hardness ratio pottery and glass height, so can punch at these hard articles.
Diamond thin-wall drill bit is a kind of novel boring bar tool, is made up of matrix and cutter head, has that bore size is accurate, speed is fast, the material periphery is not had damage and do not need characteristics such as subsequent handling.Be mainly used in and in various construction materials, creep into aperture and major diameter eyelet, during especially for engineering renovation or building reconstruction the laying of electric wire or pipeline favourable, this external concrete is deep, its instrument that also is absolutely necessary when cutting large diameter hole.
Common diamond thin-wall drill bit when the drill bit drilling, generally speaking, adopts the cooling fluid of certain pressure to inject by the hollow part of drill bit, and the minim gap of the inside and outside hole wall by drill bit and machined material forms path, reaches cooling and chip removal effect.Existing diamond thin-wall drill bit, its surfaces externally and internally that bores tooth all is flat surface, mainly relies on end face to be aided with surfaces externally and internally drilling machined material, and drill bit is slowly pierced in the machined material, forms boring.Because drill bit when the drilling machined material, can produce a large amount of drilling heats, and the difficult drainage of the break flour under boring, be accumulated in drilling place, hinder going deep into of drill bit, rate of penetration is slowed down, and the break flour of piling up is because frictional heat; In addition, during work, because the hole wall gap of drill bit and machined material is minimum, be difficult to inject enough cooling fluid cooling and chip removal, therefore, drill bit or machined material Yin Wendu raise deform, cause drill bit to lose efficacy.
For example, China utility model patent CN2818026Y discloses a kind of electroplated diamond thin-walled indented chisel, comprise bit matrix, one end of bit matrix is clamp holder, the other end is drill body, the drill body thin-walled is provided with the inlet opening, and the front end of drill body is cutting edge, and the periphery thin-walled of cutting edge is provided with the ridge design of mechanical presses moulding.This device can be in pottery and punching on glass, but owing to the dentation decorative pattern at this cutting edge place is concavo-convex straight-tooth, causes penetration rate slow, and efficient is low.
Chinese invention patent application CN1807668A discloses " a kind of diamond bit matrix powder ", the component of its carcass powder and content are by weight percentage: the spherical sintered WC particle, granularity is 125-500 micron 20%-75%, the spherical cast WC powder, granularity is 38-150 micron 20%-70%, nickel powder 5-20%.The shortcoming of this bit matrix powder is that a large amount of fine powders causes the flowability of carcass powder poor, is prone to the loose sintering defective that waits of bit matrix behind the sintering.The intensity that causes bit matrix reality is not very desirable.
Summary of the invention
The defective that the objective of the invention is to overcome in the prior art relevant diamond thin-wall drill bit structural matrix design aspect and the employed material of diamond abrasive grain aspect, start with (necessarily), further from basal body structure and diamond abrasive grain material two aspects (preferably from basal body structure, optionally) the braze welding diamond thin drilling bit is improved, and the braze welding diamond thin drilling bit of a kind of cutting efficiency height, long service life is provided.Diamond thin-wall drill bit of the present invention be applicable to metal materials such as nonmetallic materials such as comprising concrete, stone material, glass, pottery and iron, aluminium boring, get the core operation.
In order to realize purpose of the present invention, the present invention has adopted following technical scheme:
A kind of braze welding diamond thin drilling bit, the bit matrix and the tubular drill bit that comprise coaxial setting, described bit matrix is divided into the body of rod and the following body of rod, and an end of the described upward body of rod and the inner of the following body of rod axially are connected, and the other end of the last body of rod is used for linking to each other with electrical drilling machine; It is characterized in that having several on the outer end edges of described drill bit and bore tooth, described brill tooth is discontinuous arrangement, has U-shaped groove between the adjacent brill tooth, and described brill tooth is circular arc, and its surface is applied with diamond abrasive grain in the mode of soldering.
Adopt diamond thin-wall drill bit of the present invention, under the identical situation of material or other condition, although compare cutting efficiency with this area continuous sharp-pointed helical teeth commonly used decline (having reduced 3-5%) is arranged slightly, improved 17-25% service life.
Preferably, in the diamond thin-wall drill bit of the present invention, the described diameter of the body of rod of going up is less than the body of rod and both junctions have a shoulder block down.After the last body of rod is contained on the electrical drilling machine, shoulder block will limit the inside that the body of rod continues to go deep into electrical drilling machine.
Preferably, in the diamond thin-wall drill bit of the present invention, described bit matrix inside has an inner chamber, and described lumen shaft is to running through described drill bit.Have one or more on the sidewall of described bit matrix and water inlet its intracavity inter-connection.When drill bit in punching time, passing along with process time, it is very fast that the temperature of drill lip part can rise, at this moment need cooling fluid to be expelled in the inner chamber of bit matrix by water inlet, cooling fluid flows on the drill lip along the inwall of drill body, thereby drill lip is remained in the suitable temperature range.
Preferably, in diamond thin-wall drill bit of the present invention, the number of described brill tooth is 4-15, along circumferentially evenly distributing of drill bit.More preferably, the number of brill tooth is 5.
Preferably, in diamond thin-wall drill bit of the present invention, described drill bit and bit matrix are formed in one.
Preferably, in diamond thin-wall drill bit of the present invention, an end of described drill bit and the inner of bit matrix axially are connected.
Preferably, in diamond thin-wall drill bit of the present invention, the wall thickness of the following body of rod of described drill bit and bit matrix is 2-10mm.Preferably wall thickness is 2.5-5mm.
Preferably, in diamond thin-wall drill bit of the present invention, the diameter of described drill bit is 25-150mm.
Preferably, in order further to improve cutting effect and the service life of diamond thin-wall drill bit of the present invention, drill bit diamond abrasive grain layer of the present invention adopts the method for brazing preparation, and has designed the brazing solder that is applicable to No. 45 steel matrix of the application especially.The composition of described brazing solder and content are: Si:5.7-7.2wt%, Cr:4.5-7.5wt%, B:3.0-3.7wt%, Mn:1.2-2.5wt%, Zn:12.5-17.5wt%, surplus is Ni.Solid-liquid phase temperature is: 825-871 ℃.Adopt brazing solder of the present invention to compare molten point with Ni-Fe-B-Si (US4776862) and significantly reduce, diamond is not produced burn, and have good wetability and ductility.Drill bit in the invention structure of No. 45 steel matrix uses solder of the present invention to compare with Ni-Cr-B-Si solder commonly used, drill bit of the present invention can realize adamantine from sharp possess add function power continuously, by creeping into experiment, find that also brill tooth abrasion of the present invention are less, the life-span has prolonged 4.2-10.5%.
The outer end of diamond thin-wall drill bit of the present invention has the circular arc of unidirectional array and bores tooth, when drill bit rotates, bores tooth in the cutting of the surface of workpiece, thereby holes at workpiece.Have arcuate surface because bore tooth, the top diamond participates in drilling earlier when drilling, and the top diamond is polished fragmentation after a period of time.After highly reducing, the diamond of back exposes immediately, continues the drilling workpiece is holed.Thereby reached the effect of lasting drilling.In addition, offer water inlet at bit matrix, can in the process of punching, cooling in time bore tooth, in conjunction with the discrete brill odontoid of circular arc, thereby significant prolongation bore life-span of tooth.In addition, according to designing with scientific and reasonable structural design and brazing solder ground, diamond bit of the present invention can be designed to specification from the series of products of diameter 25-150mm, and can realize creeping into continuously, improved drilling efficiency, and significant prolongation the service life of diamond bit.
Description of drawings
Fig. 1 is the floor map of the diamond thin-wall drill bit of one embodiment of the invention.
The specific embodiment
Following the present invention will the present invention will be further explained and explanation with specific embodiment by reference to the accompanying drawings.The applicant is that embodiment and accompanying drawing only are in order to further specify technical scheme of the present invention, it must not to be interpreted as the restriction to the invention protection domain what this need declare.
Referring to Fig. 1, Fig. 1 is the floor map of the diamond thin-wall drill bit matrix of an embodiment of the utility model.The diamond thin-wall drill bit of present embodiment, the bit matrix 1 and the tubular drill bit 2 that comprise coaxial setting, have 5 on the outer end edges of described drill bit and bore tooth 3, described brill tooth is discontinuous arrangement, described brill tooth is circular arc, has U-shaped groove between the adjacent brill tooth, and its surface is applied with diamond abrasive grain 4, state bit matrix and be divided into the body of rod 12 and the following body of rod 11, one end of the described upward body of rod 12 and the inner of the following body of rod 11 axially are connected, the other end of the last body of rod 12 is used for linking to each other with electrical drilling machine, the described diameter of the body of rod 12 of going up is less than the body of rod 11 and both junctions have a shoulder block 13 down, described bit matrix inside has an inner chamber 14, described lumen shaft is to running through described drill bit, has the water inlet 16 with its intracavity inter-connection on the sidewall 15 of described bit matrix, and described drill bit 2 is formed in one with bit matrix 1, the wall thickness of the following body of rod of described drill bit and bit matrix is 2.5mm, and the diameter of described drill bit is 50mm; Matrix material is No. 45 steel.
Soldering processes are: brazing solder is Ni-Cr-B-Si powder (wherein Ni:82wt%, Cr:12wt%, B:4wt%, Si:4wt%), and 40-50 order average grain diameter is the diamond (concentration is 55%) of 0.36mm; Add adequate amount of ethanol and fully mix, obtain mixed material, obtain finished product in the vacuum brazing furnace soldering, heating-up temperature is 980 ℃.Thickness is 8mm.
Compare with embodiment 1, difference is the brazing solder difference.Soldering processes are: brazing solder is, Si:6.0wt%, Cr:4.8wt%, B:3.2wt%, Mn:1.8wt%, Zn:15.6wt%, and surplus is Ni., 40-50 order average grain diameter is the diamond (concentration is 55%) of 0.36mm; Add adequate amount of ethanol and fully mix, obtain mixed material, obtain finished product in the vacuum brazing furnace soldering, heating-up temperature is 850 ℃.Thickness is 8mm.
By to drill bit creep into experiment surface adopt the drill bit of structure of the present invention have diamond go out sword height, rate of penetration soon, the uniform characteristics of creeping into continuously, wear and tear.And embodiment 2 compares with embodiment 1, and the rate of wear of boring tooth is lower, and the life-span has further been improved 4.2-10.5%.
The above; it only is preferred embodiment of the present invention; can not be interpreted as limiting scope of the present invention with this, the embodiment of all distortion of making in the claimed scope of claims of the present invention that is equal to and change is all in the scope of protection of present invention.
Claims (9)
1. braze welding diamond thin drilling bit, the bit matrix and the tubular drill bit that comprise coaxial setting, described bit matrix is divided into the body of rod and the following body of rod, and an end of the described upward body of rod and the inner of the following body of rod axially are connected, and the other end of the last body of rod is used for linking to each other with electrical drilling machine; Have several on the outer end edges of described drill bit and bore tooth, described brill tooth is discontinuous arrangement, has U-shaped groove between the adjacent brill tooth, it is characterized in that: described brill tooth is circular arc, and its surface is applied with diamond abrasive grain in the mode of soldering; The material of described bit matrix is No. 45 steel, and the composition of described brazing solder and content are: Si:5.7-7.2wt%, Cr:4.5-7.5wt%, B:3.0-3.7wt%, Mn:1.2-2.5wt%, Zn:12.5-17.5wt%, surplus is Ni.
2. braze welding diamond thin drilling bit according to claim 1 is characterized in that the described diameter of the body of rod of going up is less than the body of rod and both junctions have a shoulder block down.
3. braze welding diamond thin drilling bit according to claim 1 is characterised in that described bit matrix inside has an inner chamber, and described lumen shaft is to running through described drill bit; Have one or more on the sidewall of described bit matrix and water inlet its intracavity inter-connection.
4. braze welding diamond thin drilling bit according to claim 1 is characterised in that described bit matrix inside has an inner chamber, and described lumen shaft is to running through described drill bit.
5. braze welding diamond thin drilling bit according to claim 1, the number that is characterised in that described brill tooth are 4-15, along circumferentially evenly distributing of drill bit.
6. braze welding diamond thin drilling bit according to claim 1 is characterised in that described drill bit and bit matrix are formed in one.
7. braze welding diamond thin drilling bit according to claim 1 is characterised in that an end of described drill bit and the inner of bit matrix axially are connected.
8. braze welding diamond thin drilling bit according to claim 1, the wall thickness that is characterised in that the following body of rod of described drill bit and bit matrix is 2-10mm.
9. braze welding diamond thin drilling bit according to claim 1, the diameter that is characterised in that described drill bit is 25-150mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110204528 CN102275228B (en) | 2011-07-21 | 2011-07-21 | Brazing diamond core drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110204528 CN102275228B (en) | 2011-07-21 | 2011-07-21 | Brazing diamond core drill bit |
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| Publication Number | Publication Date |
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| CN102275228A CN102275228A (en) | 2011-12-14 |
| CN102275228B true CN102275228B (en) | 2013-10-02 |
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| CN 201110204528 Active CN102275228B (en) | 2011-07-21 | 2011-07-21 | Brazing diamond core drill bit |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103788926B (en) * | 2014-02-26 | 2015-08-19 | 禹州市和汇超硬材料有限公司 | A kind of diamond abrasive and the application in making or reparation excavator bucket teeth thereof |
| CN112622066A (en) * | 2020-12-30 | 2021-04-09 | 天皓建筑科技有限公司 | High-precision coring bit |
| CN113084719B (en) * | 2021-05-10 | 2022-07-08 | 江苏锋菱超硬工具有限公司 | Production process of multilayer brazed diamond hole drill |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2211350Y (en) * | 1994-10-08 | 1995-11-01 | 中国建筑第七工程局郑州医疗器械厂 | Unified diamond thin wall drill |
| US7124753B2 (en) * | 1997-04-04 | 2006-10-24 | Chien-Min Sung | Brazed diamond tools and methods for making the same |
| US20020095875A1 (en) * | 2000-12-04 | 2002-07-25 | D'evelyn Mark Philip | Abrasive diamond composite and method of making thereof |
| CN2601768Y (en) * | 2002-10-11 | 2004-02-04 | 石家庄博深工具有限公司 | Thin wall diamond drill bit |
| US7347292B1 (en) * | 2006-10-26 | 2008-03-25 | Hall David R | Braze material for an attack tool |
| CN201151166Y (en) * | 2007-11-14 | 2008-11-19 | 博深工具股份有限公司 | Novel diamond bit |
| CN101780613B (en) * | 2010-03-25 | 2011-11-09 | 杭州华光焊料有限公司 | Special rare earth alloy silver-brazing filler metal |
| CN101824967B (en) * | 2010-04-30 | 2012-10-03 | 石家庄环球新世纪工具有限公司 | Novel high adhesion strength diamond engineering thin wall drilling bit and manufacturing method |
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