CN103334693A - Down-hole hammer piston and machining process thereof - Google Patents
Down-hole hammer piston and machining process thereof Download PDFInfo
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- CN103334693A CN103334693A CN2013102473344A CN201310247334A CN103334693A CN 103334693 A CN103334693 A CN 103334693A CN 2013102473344 A CN2013102473344 A CN 2013102473344A CN 201310247334 A CN201310247334 A CN 201310247334A CN 103334693 A CN103334693 A CN 103334693A
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- piston
- ball blast
- air hammer
- hole air
- pit
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Abstract
The invention relates to a down-hole hammer piston. At least a round of groove is arranged in the outer circumference of a matching surface of the piston and the inner wall of an air cylinder, the cross section of the groove is U-shaped or V-shaped, and the depth of the groove is not greater than 2mm; pits are fully distributed on the outer circumferential surface of the matching surface of the piston and the inner wall of the air cylinder, the depth of each pit is 20-30 threads and the width of each pit is 5-8 threads. The invention further provides a machining process of the down-hole hammer piston. The machining process comprises the following steps of machining and forming the piston, carrying out thermal treatment, carrying out the match grinding on the inner circumference of a matched air cylinder till the design requirements are achieved, and carrying out shot blasting on the piston. The down-hole hammer piston and the machining process of the piston, which are disclosed by the invention, have the advantages that the structure design is reasonable, the machining and manufacturing operations are easy, the lubrication effect of a work room of down-hole hammer piston can be effectively modified, and the service life of the down-hole hammer piston is prolonged; the down-hole hammer piston is suitable to the application of a distribution type piston cylinder without a piston ring; and the machining process disclosed by the invention is suitable for industrial production.
Description
Technical field
The invention discloses a kind of down-the-hole air hammer piston and processing technology, refer in particular to a kind of down-the-hole air hammer piston that prevents because pulling down-the-hole air hammer piston and the processing technology of initial failure.Belong to the down-the-hole air hammer preparing technical field.
Background technology
The piston of down-the-hole air hammer is impactor " heart ", is the moving component that bears HI high impact, high friction, and an end of piston is sleeved in the cylinder, for satisfying the needs of impactor distribution and impact, between piston and the cylinder inner wall cooperate at interval general≤10.The surface roughness of existing down-the-hole air hammer piston and cylinder inner wall is generally Ra=0.4 μ m, piston and cylinder inner wall fitting face are cylinder, its processing technology is earlier piston and cylinder inner wall to be heat-treated, then piston face is carried out ball blast, reduce the thermal stress of piston face, at last piston and cylinder inner wall match grinding to surface roughness are generally Ra=0.4 μ m, cooperate at interval≤10 after, namely meet design requirement.Because the external surface of piston and the inner surface of cylinder are after heat treatment, case hardness reaches HRC56-58 usually, hardness is very high, behind the match grinding, finish is very high, piston is that face contacts with the cylinder inner wall fitting face, fit dimension is little, the lubricating oil film that forms between piston and the cylinder inner wall is extremely thin, and the motion frequency of piston is very high, and the friction between piston and the cylinder inner wall can make the surface temperature of piston sharply raise, cause the lubricating oil film vaporization, cause producing dry friction between piston and the cylinder inner wall, this has further aggravated the friction between piston and the cylinder inner wall undoubtedly, forms vicious circle.Because the fit dimension between piston and the cylinder inner wall is little, lubrication oil can not in time enter between piston and the cylinder inner wall, to replenish the lubricating oil film that is vaporized, causes in a lot of impactors piston to be pulled because of the cylindrical friction and fracture initial failure occurs.Therefore, existing down-the-hole air hammer piston structure and processing technology are optimized, necessitate.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art and provide a kind of reasonable in design, processing and manufacturing easily, can effectively improve down-the-hole air hammer pistons work chamber lubricant effect, prolong down-the-hole air hammer piston down-the-hole air hammer piston and the processing technology in application life.
A kind of down-the-hole air hammer piston of the present invention is that the excircle at piston and cylinder inner wall fitting face arranges at least one circle groove, and described groove cross section is U-shaped or V-type, depth of groove≤2mm.
The further improvement of a kind of down-the-hole air hammer piston of the present invention is that the periphery at piston and cylinder inner wall fitting face is covered with pit, and the degree of depth of described pit is the 20-30 silk, and width is the 5-8 silk.
A kind of down-the-hole air hammer piston of the present invention, described pit adopt the technology at the piston face ball blast to obtain.
The processing technology of a kind of down-the-hole air hammer piston of the present invention comprises the steps:
The first step, machine
With the piston size of blank by design, machine-shaping;
Second step, heat treatment
The piston of first step machine-shaping is handled by the Technology for Heating Processing of setting;
The 3rd step, grinding
Will be through circle match grinding in heat treated outside piston and the supporting cylinder to reaching designing requirement;
The 4th step, ball blast
Piston is hooked on the automatic rotary hanger in the shot-blasting machine, piston is carried out ball blast.
The processing technology of a kind of down-the-hole air hammer piston of the present invention, described ball blast technological parameter is: steel ball speed 78m/s, ball blast amount 350-450Kg/min, by the impelling simultaneously of 2 ball blast mouths, steel ball size φ 12-14mm, 50-60 minute ball blast time, the ball blast mouth is 0.5m apart from the distance of workpiece, and ball hardness is identical with piston hardness.
The processing technology of a kind of down-the-hole air hammer piston of the present invention, behind the piston ball blast, piston face is covered with degree of depth 20-30 silk, and width is the pit of 5-8 silk.
The present invention is owing to adopt said structure, excircle at piston and cylinder inner wall fitting face arranges at least one circle groove, when piston when the cylinder high speed is moved, lubrication oil can be stored in the groove, when lubricating oil film disappears because of high-temperature gasification, the lubrication oil that is stored in the groove can be supplemented between piston and the cylinder inner wall at any time, forms new lubricating oil film; Thereby ensure the effectively lubricating between piston and the cylinder inner wall.In addition, the present invention carries out Shot Blasting to the piston after Overheating Treatment, match grinding, on the one hand, utilizes ball blast, the machining stress that produces when the thermal stress of reduction piston face and grinding, the stability of raising piston size; On the other hand, adopt the hardness shot identical with piston to carry out ball blast, by control steel ball speed, diameter and the ball blast mouth distance apart from workpiece, guarantee through after the Shot Blasting, piston face can form densely covered pit, and make the degree of depth, the size of pit be in controlled scope, guarantee that the piston profile size meets design requirement.After piston face forms densely covered pit, when piston moves in the cylinder high speed, can store a large amount of lubrication oil in the densely covered pit, further improved reliability lubricated between piston and the cylinder inner wall.Effectively reduce piston and pull the probability of initial failure because of friction, prolong impactor application life.
The present invention has solved this area and has urgently wished for a long time to solve and the lubrication problem of unsolved high-speed motion piston by simple operation adjustment.By the piston after the grinding is carried out ball blast, neither influence the fit dimension of piston, make surface formation energy hold the pit of oil again, can play the effect of holding oil, surface of the work has produced compressive stress behind the ball blast, can offset the tensile stress after the part grinding, has further improved the dimensional stability of piston.Adopt the application life of piston on limestone of structure of the present invention and processing method preparation up to 4400m, even higher, and the application life of the piston of prior art for preparing on limestone is smaller or equal to 2300m; The present invention prepared application life of piston on granite is up to 4500m, and the application life of the piston of prior art for preparing on granite is smaller or equal to 2500m; Be about 2 times of the piston of prior art for preparing at piston of the present invention on application life, in addition higher.The present invention can not only prolong the application life of piston also to improving the quality of products, and prevents that piston is because pulling the remarkable result that early fracture has.
In sum, reasonable in design of the present invention, processing and manufacturing easily, can effectively improve down-the-hole air hammer pistons work chamber lubricant effect, prolong down-the-hole air hammer piston application life.Be applicable to the application of no piston ring distributing type piston-cylinder.Be suitable for suitability for industrialized production.
Description of drawings
Accompanying drawing 1 is down-the-hole air hammer piston structure schematic diagram of the present invention.
Among the figure: 1-piston, 2-groove, 3-pit.
The specific embodiment
Below in conjunction with specific embodiment the present invention is described in further details.
Embodiment 1
Referring to accompanying drawing 1, a kind of down-the-hole air hammer piston of the present invention is that the excircle at piston 1 and cylinder inner wall fitting face arranges at least one circle groove 2, and described groove 2 cross sections are U-shaped or V-type, depth of groove≤2mm.
Embodiment 2
Present embodiment is on the basis of embodiment 1, is covered with pit 3 at the periphery of piston and cylinder inner wall fitting face, and described pit 3 adopts the technology at the piston face ball blast to obtain, and the degree of depth of pit 3 is the 20-30 silk, and width is the 5-8 silk.
Embodiment 3
A kind of processing technology of down-the-hole air hammer piston comprises the steps:
The first step, machine
With the 4 cun pistons of blank by design, machine-shaping;
Second step, heat treatment
The piston of first step machine-shaping is handled by the Technology for Heating Processing of setting;
The 3rd step, grinding
Will be through circle match grinding in heat treated outside piston and the supporting cylinder to reaching designing requirement;
The 4th step, ball blast
Piston is hooked on the automatic rotary hanger in the shot-blasting machine, piston is carried out the described ball blast technological parameter of ball blast is: steel ball speed 78m/s, ball blast amount 350Kg/min, by the impelling simultaneously of 2 ball blast mouths, steel ball size φ 12mm, 50 minutes ball blast time, the ball blast mouth is 0.5m apart from the distance of workpiece, and ball hardness is identical with piston hardness; Behind the piston ball blast, piston face is covered with 20 of the degree of depth, and width is 5 pit, obtains finished product.
Present embodiment gained finished product and existing 4 cun impactor pistons are carried out life tests at limestone and granite, and testing result sees Table 1.The application life of present embodiment gained finished product on limestone is 2600m as can be seen from Table 1, and the application life of existing 4 cun impactor pistons on limestone only is 1800m; The application life of present embodiment gained finished product on granite is 3500m, and the application life of existing 4 cun impactor pistons on granite only is 1500m.
Embodiment 4
A kind of processing technology of down-the-hole air hammer piston comprises the steps:
The first step, machine
With the 5 cun pistons of blank by design, machine-shaping;
Second step, heat treatment
The piston of first step machine-shaping is handled by the Technology for Heating Processing of setting;
The 3rd step, grinding
Will be through circle match grinding in heat treated outside piston and the supporting cylinder to reaching designing requirement;
The 4th step, ball blast
Piston is hooked on the automatic rotary hanger in the shot-blasting machine, piston is carried out the described ball blast technological parameter of ball blast is: steel ball speed 78m/s, ball blast amount 400Kg/min, by the impelling simultaneously of 2 ball blast mouths, steel ball size φ 13mm, 55 minutes ball blast time, the ball blast mouth is 0.5m apart from the distance of workpiece, and ball hardness is identical with piston hardness; Behind the piston ball blast, piston face is covered with 25 of the degree of depth, and width is 6.5 pit, obtains finished product.
Present embodiment gained finished product and existing 5 cun impactor pistons are carried out life tests at limestone and granite, and testing result sees Table 1.The application life of present embodiment gained finished product on limestone is 4300m as can be seen from Table 1, and the application life of existing 5 cun impactor pistons on limestone only is 2200m; The application life of present embodiment gained finished product on granite is 4200m, and the application life of existing 5 cun impactor pistons on granite only is 2000m.
Embodiment 5
A kind of processing technology of down-the-hole air hammer piston comprises the steps:
The first step, machine
With the 6 cun pistons of blank by design, machine-shaping;
Second step, heat treatment
The piston of first step machine-shaping is handled by the Technology for Heating Processing of setting;
The 3rd step, grinding
Will be through circle match grinding in heat treated outside piston and the supporting cylinder to reaching designing requirement;
The 4th step, ball blast
Piston is hooked on the automatic rotary hanger in the shot-blasting machine, piston is carried out the described ball blast technological parameter of ball blast is: steel ball speed 78m/s, ball blast amount 450Kg/min, by the impelling simultaneously of 2 ball blast mouths, steel ball size φ 14mm, 60 minutes ball blast time, the ball blast mouth is 0.5m apart from the distance of workpiece, and ball hardness is identical with piston hardness; Behind the piston ball blast, piston face is covered with 30 of the degree of depth, and width is 8 pit, obtains finished product.
Present embodiment gained finished product and existing 6 cun impactor pistons are carried out life tests at limestone and granite, and testing result sees Table 1.The application life of present embodiment gained finished product on limestone is 4400m as can be seen from Table 1, and the application life of existing 6 cun impactor pistons on limestone only is 2300m; The application life of present embodiment gained finished product on granite is 4200m, and the application life of existing 6 cun impactor pistons on granite only is 2500m.
Table 1
The application life of piston of the prior art on limestone and granite is only up to 2500m as can be seen from Table 1; And the piston that adopts structure of the present invention and processing method to prepare, its application life approach 2 times of existing piston up to 4500m the application life on limestone and granite.
As can be seen, reasonable in design of the present invention, processing and manufacturing easily, effectively prolong down-the-hole air hammer piston application life from above-described embodiment.
Claims (6)
1. down-the-hole air hammer piston, it is characterized in that: the excircle at piston and cylinder inner wall fitting face arranges at least one circle groove, and described groove cross section is U-shaped or V-type, depth of groove≤2mm.
2. a kind of down-the-hole air hammer piston according to claim 1, it is characterized in that: the periphery at piston and cylinder inner wall fitting face is covered with pit, and the degree of depth of described pit is the 20-30 silk, and width is the 5-8 silk.
3. a kind of down-the-hole air hammer piston according to claim 2 is characterized in that: described pit adopts the technology at the piston face ball blast to obtain.
4. according to the processing technology of any described a kind of down-the-hole air hammer piston of claim 1-3, comprise the steps:
The first step, machine
With the piston size of blank by design, machine-shaping;
Second step, heat treatment
The piston of first step machine-shaping is handled by the Technology for Heating Processing of setting;
The 3rd step, grinding
Will be through circle match grinding in heat treated outside piston and the supporting cylinder to reaching designing requirement;
The 4th step, ball blast
Piston is hooked on the automatic rotary hanger in the shot-blasting machine, piston is carried out ball blast.
5. the processing technology of a kind of down-the-hole air hammer piston according to claim 4, it is characterized in that: described ball blast technological parameter is: steel ball speed 78m/s, ball blast amount 350-450Kg/min, by the impelling simultaneously of 2 ball blast mouths, steel ball size φ 12-14mm, 50-60 minute ball blast time, the ball blast mouth is 0.5m apart from the distance of workpiece, and ball hardness is identical with piston hardness.
6. the processing technology of a kind of down-the-hole air hammer piston according to claim 5, it is characterized in that: behind the piston ball blast, piston face is covered with degree of depth 20-30 silk, and width is the pit of 5-8 silk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102473344A CN103334693A (en) | 2013-06-20 | 2013-06-20 | Down-hole hammer piston and machining process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102473344A CN103334693A (en) | 2013-06-20 | 2013-06-20 | Down-hole hammer piston and machining process thereof |
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| CN103334693A true CN103334693A (en) | 2013-10-02 |
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| CN2013102473344A Pending CN103334693A (en) | 2013-06-20 | 2013-06-20 | Down-hole hammer piston and machining process thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090200082A1 (en) * | 2008-02-08 | 2009-08-13 | Bui Huy D | Methods and apparatus for drilling directional wells by percussion method |
| CN201934016U (en) * | 2010-11-18 | 2011-08-17 | 长沙天和钻具机械有限公司 | Down-the-hole hammer |
| CN102213312A (en) * | 2011-05-27 | 2011-10-12 | 大连滨城活塞制造有限公司 | Process for machining piston skirt |
| CN102434095A (en) * | 2011-12-30 | 2012-05-02 | 苏州新锐工程工具有限公司 | High wind pressure downhole hammer |
| CN202611586U (en) * | 2011-12-30 | 2012-12-19 | 苏州新锐合金工具股份有限公司 | High wind pressure down-the-hole impactor |
| CN203309090U (en) * | 2013-06-19 | 2013-11-27 | 长沙天和钻具机械有限公司 | Down-hole hammer piston |
-
2013
- 2013-06-20 CN CN2013102473344A patent/CN103334693A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090200082A1 (en) * | 2008-02-08 | 2009-08-13 | Bui Huy D | Methods and apparatus for drilling directional wells by percussion method |
| CN201934016U (en) * | 2010-11-18 | 2011-08-17 | 长沙天和钻具机械有限公司 | Down-the-hole hammer |
| CN102213312A (en) * | 2011-05-27 | 2011-10-12 | 大连滨城活塞制造有限公司 | Process for machining piston skirt |
| CN102434095A (en) * | 2011-12-30 | 2012-05-02 | 苏州新锐工程工具有限公司 | High wind pressure downhole hammer |
| CN202611586U (en) * | 2011-12-30 | 2012-12-19 | 苏州新锐合金工具股份有限公司 | High wind pressure down-the-hole impactor |
| CN203309090U (en) * | 2013-06-19 | 2013-11-27 | 长沙天和钻具机械有限公司 | Down-hole hammer piston |
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Application publication date: 20131002 |