CN1047819C - Method for making chisel bit for drilling rock - Google Patents
Method for making chisel bit for drilling rock Download PDFInfo
- Publication number
- CN1047819C CN1047819C CN95112303A CN95112303A CN1047819C CN 1047819 C CN1047819 C CN 1047819C CN 95112303 A CN95112303 A CN 95112303A CN 95112303 A CN95112303 A CN 95112303A CN 1047819 C CN1047819 C CN 1047819C
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- CN
- China
- Prior art keywords
- soldering
- drill bits
- temperature
- present
- room temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The present invention provides a technical scheme of a method for manufacturing straight rock drill bits, which can improve the hardness and the toughness of drill bits made of 40Cr common steel. The technical scheme is characterized in that reformation is carried out based on the existing manufacturing method, and the processing that air cooling to room temperature is carried out after soldering at present is changed to the processing that after being precooled, the soldering is put into a salt bath isothermobath of 450 to 300DEG C. The using effect of the drill bits manufactured by the technical scheme is increased to about two times of that of the drill bits manufactured by the original method, thereby solving the problem in manufacturing drill bits at present.
Description
What the present invention relates to is mine or construction work jackhammer supporting drilling tool, the especially manufacture method of yi word pattern rock drill bit.
At present, domestic extremely many to application light-duty, air rock drill, demand to its matching used yi word pattern rock drill bit is also just very big, but, bore bit manufacturer be because the restriction that is subjected to cost can not adopt special air cooling steel to make drill rod casing, and be to use such as 45,55 or common iron such as 40Cr make drill rod casing.Air cools off naturally and comes normalized treatment after adopting the solid sheet of induction brazing on the technology, so its metallographic structure is coarse pearlite and ferrite, hardness is less than HRC20, and its intensity is low, poor toughness, to the chucking power of hard metal tip a little less than.Therefore, in use occur the bloated trousers of drill rod casing, disconnected trousers easily, split the trousers phenomenon, cause the bore bit premature failure, especially just lower its application life at hard rock, every bore bit drilling depth has only 15-25 rice, make the carbide alloy waste serious, effectively utilization does not also reach 40% of reasonable utilization, and this is the existing big problem of bore bit of producing at present.
Purpose of the present invention is exactly at the existing problem of the rock drill bit of present production, improves on the basis of existing manufacture method, and a kind of manufacture method of new yi word pattern rock drill bit is provided.
For finishing purpose of the present invention, this programme in the existing method of rock drill bit of making promptly at first by machine or forging molding, Milling Process soldering hard metal tip groove, use the induction brazing hard metal tip again, cooling processing is cooled to room temperature then, again through sandblast, reconditioning, after oil surface or japanning are handled, through check, improve on the basis of this method of packing and finishing, adopt the distinctive method of this programme, be that described cooling processing is under 960-930 ℃ temperature of soldering, after in air, naturally cooling to 840-800 ℃, insert temperature in 450-300 ℃ salt made from earth containing a comparatively high percentage of sodium chloride salt bath isothermobath, took out at least 4 minutes through isothermal processes and naturally cool to room temperature.
In this programme,, make bore bit obtain combination of strength and toughness bainite structure preferably owing to adopted the high temperature of bore bit after soldering promptly to enter the means of isothermal quenching of lowering the temperature rapidly in the salt bath of three, 400 degree isothermals by precooling.The hardness of drill rod casing is brought up to HRC30-35.Improved the reliability of using in actual applications, bloated trousers, disconnected trousers no longer occur, split the trousers phenomenon, every drilling depth 30-50 rice is brought up in the average life span of solid rock, improved nearly one times than the service life of the bits of producing with the manufacture method of prior art, and the residual height of carbide alloy has improved the utilization rate of carbide alloy greatly at 5～7 millimeters when scrapping.This shows, the present invention compared with prior art, its effect is extremely significant.
Below by its body embodiment that Y140-722 type bore bit is produced, come technology of the present invention retouched and apply further elaboration.The manufacture method of yi word pattern rock drill bit is to adopt common iron 40Cr steel, at first be processed into bore bit base type by machine, and, use Frequency Induction Heating under 950 ± 10 ℃ temperature, to carry out the soldering hard metal tip again with Milling Process soldering hard metal tip groove, scolder is adopted sheet copper parent metal.Bore bit warp natural precooling in air that welding is good, when temperature drops to 820 ± 20 ℃ by 950 ± 10 ℃, insert temperature immediately and in 370 ± 20 ℃ salt made from earth containing a comparatively high percentage of sodium chloride salt bath isothermobath, lower the temperature and carry out isothermal processes, in isothermobath, after 15 minutes isothermal processes, go out groove and be cooled to room temperature.Then, again through sandblast, reconditioning, after finish coatings is handled, by check, be packaged into Kucheng's product and finish.
Claims (1)
1. the manufacture method of yi word pattern rock drill bit, at first by machine or forging molding, Milling Process soldering hard metal tip groove, use the induction brazing hard metal tip again, cooling processing is cooled to room temperature then, again through sandblast, reconditioning, after oil surface or japanning are handled, through check, pack and finish, the invention is characterized in that described cooling processing is under 960-930 ℃ temperature of soldering, after in air, naturally cooling to 840-800 ℃, insert temperature in 450-300 ℃ salt made from earth containing a comparatively high percentage of sodium chloride salt bath isothermobath, took out at least 4 minutes through isothermal processes and naturally cool to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95112303A CN1047819C (en) | 1995-12-29 | 1995-12-29 | Method for making chisel bit for drilling rock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95112303A CN1047819C (en) | 1995-12-29 | 1995-12-29 | Method for making chisel bit for drilling rock |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1153250A CN1153250A (en) | 1997-07-02 |
| CN1047819C true CN1047819C (en) | 1999-12-29 |
Family
ID=5079480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95112303A Expired - Fee Related CN1047819C (en) | 1995-12-29 | 1995-12-29 | Method for making chisel bit for drilling rock |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1047819C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100358662C (en) * | 2004-05-01 | 2008-01-02 | 康定松 | Technique of intermediate frequency braze welding bore bit |
| CN101395335B (en) * | 2006-01-26 | 2013-04-17 | 犹他大学研究基金会 | Polycrystalline abrasive composite cutter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87201542U (en) * | 1987-05-20 | 1988-03-23 | 谭麟德 | Head of hammer drill |
| CN2052809U (en) * | 1989-06-07 | 1990-02-14 | 中国地质大学（武汉） | Carbide rock drill |
-
1995
- 1995-12-29 CN CN95112303A patent/CN1047819C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87201542U (en) * | 1987-05-20 | 1988-03-23 | 谭麟德 | Head of hammer drill |
| CN2052809U (en) * | 1989-06-07 | 1990-02-14 | 中国地质大学（武汉） | Carbide rock drill |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1153250A (en) | 1997-07-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |