CN102719637A - Needle-embedded ultrasonic surface strengthening impacting head suitable for mechanical operation - Google Patents
Needle-embedded ultrasonic surface strengthening impacting head suitable for mechanical operation Download PDFInfo
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- CN102719637A CN102719637A CN2012102074104A CN201210207410A CN102719637A CN 102719637 A CN102719637 A CN 102719637A CN 2012102074104 A CN2012102074104 A CN 2012102074104A CN 201210207410 A CN201210207410 A CN 201210207410A CN 102719637 A CN102719637 A CN 102719637A
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Abstract
The invention discloses a needle-embedded ultrasonic surface strengthening impacting head suitable for mechanical operation, and belongs to the technical field of metal surface treatment. The needle-embedded ultrasonic surface strengthening pounding head suitable for the mechanical operation comprises a guide sleeve and an impacting needle, wherein the impacting needle is arranged inside a guide hole on the guide sleeve. The upper end of the impacting needle is contacted with the lower end of an iron block to ensure that the length of the impacting needle inserted into the guide hole is 0 to 5 microns less than the depth of the guide hole. The impacting head can perform uniform ultrasonic strengthening treatment on the workpieces on a plane, a constant-curvature curve and any continuous-curvature curve by cooperating with a mechanically-clamped impacting head motion trail and motion speed control system and a normal tracking automatic control system when mechanically clamped. The needle-embedded ultrasonic surface strengthening impacting head has the main advantages of capability of satisfying mechanical clamping and automatic control requirements as well as suitability for manual hand-held operation.
Description
Technical field
The present invention relates to a kind of ultrasonic surface strengthening impact head of built-in pin type that is applicable to mechanized operation, belong to field of metal surface treatment technology.
Background technology
It is one of effective means of metal material surface reinforcement that bead blasted surfaces is handled.The tradition shot-blast process usually with pressurized air and mechanical cf-as propulsion source, ACCELERATING PROJECTILE bombardment material surface.Its shortcoming is that equipment energy consumption is big, and dust pollution is arranged, and it is big to take up room, inconvenient mobile operating etc.Although the ultrasonic shot peening surface treatment receives device structure and Power Limitation, only be fit to miniature workpiece is carried out surface strengthening, overcome the shortcoming of traditional shot-blast process, power ultrasonic is used for surface strengthening and demonstrates huge development potentiality.
Ultrasonic impact (Ultrasonic Impact Treatment-UIT) technology is proposed by Ukraine Paton institute of welding the earliest.1972, invented magnetostrictive transducer ultrasonic impact device (patent No. USSR No.472782).1997; The surface treatment lack of homogeneity that Ukraine's patent (patent No. Ukrainian Patent No.13936) exists to earlier device; System needs water-cooled to cause equipment and complex technical process, and impact part is easy to shortcomings such as damage, the elastic connection structure of employing impact head and horn; And between horn and impact bar (pin), increase mode such as Materials with High Strength pad, earlier device is improved.But the device after improving generally can only non-stop run 3-5 minute, needs the frequent shutdown cooling, and only be fit to handle the component flat surface, and the butt welded seam treatment effect is not good.2002, Prokopenko etc. have invented piezoelectric ceramic transducer ultrasonic impact device (patent No. US 6467321 B2), have improved effciency of energy transfer, have reduced percussion mechanism volume, weight and to the requirement of cooling intensity.2007, Statnikov etc. invented and have been used for vibrational system and the instrument (patent No. US 2007/0040476 A1) that ultrasonic impact is handled.Through shape, size, arrangement mode, brazing technology, anti-cavitation erosion mode and the cavity shape of analyzing magnetostrictor; The material of horn, shape, size, termination sclerosis mode and hardened layer structure; The shape of striker pin, size and fit; And influence factors such as the material of wear ring, shape, size and fit; Optimized material, shape, the size of each parts, preparation technology and fit have significantly improved consistence, stability and the safety of device performance comprehensively.2008; Prokopenko etc. have invented the ultrasonic instrument (patent No. WO 2008/150250 A1) that is used for the metal sclerosis and eliminates stress and handle; Through setting up measure such as TP, the efficient of cooling system is increased, the work period prolongs; The wearing and tearing of impact head part and fatigue property improve, and have improved the safety of device.
Welding engineering technical institute of University Of Tianjin has built ultrasonic impact equipment in 1997.2002, Wang Dongpo etc. invented " a kind of piezoelectric-type ultrasonic impact device that improves fatigue properties of welded joints " (publication number CN1359778A), have replaced original magnetostrictive transducer with piezoelectric transducer.Compare with same device, under identical operating frequency, its volume reduces 300-600%, weight saving 40-100%, and efficient improves 200-300%, and the fatigue strength of weld improves 20-200%, prolongs 3-400 fatigue lifetime doubly, and need not liquid cooling.Relevant serial patent of invention also has: " a kind of piezoelectric-type ultrasonic impact gun " (publication number CN 1359777A), " a kind of vibration amplitude arm for ultrasonic impact gun " (publication number CN 1359781A) and " a kind of multi-needle impact head for ultrasonic impact gun " (publication number CN 1359780A) etc.2006-2008, again SEPARATE APPLICATION patent of invention " bevel angle ultrasonic impacting gun " (publication number CN 1887507A), can adapt to various locus and arbitrarily angled operation; " a kind of half wave length ultrasound impact gun " (publication number CN 101134195A) and " a kind of ultrasonic impact gun of 3/2 wavelength " (publication number CN 201186944Y), striker pin can touch specific position such as small space on the workpiece; " a kind of rolling impact head ultrasonic impact gun " (publication number CN 101220407A) guaranteed the stable effective utilization with ultrasonic energy of the resonance characteristic of system.
2003, Zhao Xianhua etc. " a kind of raising weld fatigue intensity ultrasonic impact gun " utility model patent (patent No. ZL 02270273.3) adopted the long complex horn of the all-wave that promotes level and output stage two-stage luffing to transmit energy; Promoting level is the bigger stepped appearance of luffing, and output stage is the very low taper of responsive to load degree, thereby has overcome the problem of notch cuttype half-wavelength horn responsive to load; And horn flats output terminal is to the disadvantageous problem of sound wave propagate; Both obtain bigger luffing ratio, and also satisfied high-power and worked to the requirement of horn shape factor down, reduced the stress concentration of horn; Improved work-ing life; The stability and the safety of system have been increased, the piezoelectric ceramic transducer of improvement and matching of load, the work-ing life of also having improved transverter greatly.Got permission " a kind of ultrasonic impact instrument that is applicable to aircraft engine impeller weld seam " (patent No. ZL 200620087844.5) and " a kind of instrument that the small space weld seam is carried out ultrasonic impact " (patent No. ZL 200620087846.4) two utility model patent technology in 2007 again in succession.The former adopts three striker pin that radially distribute in the same plane, can handle right angle weld seam, cross joint high-quality, efficiently; The latter adopts long, single, taper striker pin, and to the small space weld seam, like slot weld, ring groove weld seam, complicated shape inner chambers such as the bucket end, inner chamber are handled.Utility model patent " flat striker pin " (patent No. ZL 200620087845.X) has overcome the circular impact pin and has been prone to stay in the metallic surface zap pit and possibly causes the problem that secondary stress is concentrated, and makes welding residual stress be able to more effectively eliminate.
2008; The patent of invention of Wang Dongsheng etc. " a kind of high-efficiency ultrasonic impact head that is used for the weld stress elimination " patent of invention (publication number CN 101429588A); To impact pin hole and be symmetrically distributed in the both sides, axis; And be the benchmark 2-5o that slopes inwardly with the axis, the toe of weld on processing welding lines both sides improves weld seam treatment effect and efficient simultaneously.
In sum, the common feature of existing ultrasonic impact gun is that striker pin is exposed to outside the impact head orienting sleeve fully, and the striker pin upper end is through end in contact under anvil iron and the horn, and the striker pin lower end directly is butted on pending surface.Be that horn, striker pin and pending surperficial three are for vertically to contact firmly.During impact gun work; The operation external force and the vibrational energy of horn lower end that are applied on the impact gun affact workpiece surface through striker pin; Workpiece is impacted; The reactive force of operation external force and the elastic force of workpiece surface make the striker pin resilience, and the reactive force of operating external force simultaneously also affacts the horn lower end through striker pin, make the output energy of horn receive the influence of operating external force.
If the horn vibrational frequency does
, do not have the effect of operation external force
F E=0 o'clock, the Oscillation Amplitude of horn did
A 0, horn free end vibration displacement
yIn time
tThe relation that changes
y?=?
A 0cos2
ft (1)
Vibration velocity
vFor
v?=?
dy/
dt?=-2
A 0 fsin2
ft (2)
In the formula (2),
v 0=-2
A 0 fAmplitude for horn output vibration velocity.
If the single quality of striker pin does
m 0, the action time of impacting workpiece surface
tBe approximately equal to the vibrational period
T1/2nd, promptly
t=
T/ 2=1/2
fAccording to momentum principle, do not have operation external force and make the surging force of time spent striker pin workpiece surface
F 0Be approximately
F 0 t?=?
m 0 v 2?–?
m 0 v 1?=?-2
m 0 v 0(3)
Promptly
F 0?=?8
A 0 m 0 f? 2 (4)
In the formula (3),
v 1For the striker pin lower end contacts the downward impact velocity of moment impact pin with workpiece surface;
v 2For leaving workpiece surface moment rebound velocity in the striker pin lower end.
Because
A 0Output rating by ultra-sonic generator equipment is regulated, with operation external force
F EIrrelevant, what confirm
m 0,
A 0,
fUnder the condition, the inferior surging force of the every pin of striker pin all can guarantee identical.
When ultrasonic impact gun applies operation external force
F EThe time, the reactive force of operation external force acts on the horn lower end through striker pin, will limit the horn Oscillation Amplitude, and the horn amplitude is during by no external force
A 0Be reduced to
A', striker pin is to the surging force of workpiece surface also will be by no external force the time
F 0Be reduced to
F',
F′?=?8
A′
m 0 f? 2 (5)
Because amplitude
A' with operation external force
F EChange,
F EIt is big more,
A' more little,
F' also more little, the inferior surging force of promptly every pin to workpiece surface
F' with external force
F EChange.When
F EIncrease above a threshold value,
A 'Level off to 0, the horn lower end will be difficult to starting of oscillation, and striker pin is to the surging force of workpiece surface
F' be reduced to 0 immediately, the impact gun overload takes place, the phenomenon of promptly " suffocating ", thus interrupt impacting to workpiece surface.If be applied to the operation external force on the rifle body
F EToo small, or certain striker pin in a plurality of striker pin do not contact with being processed the surface fully, and then striker pin is difficult to resilience, can not form continuously equally to impact.
It is thus clear that, when existing ultrasonic impact gun adopts artificial hand-held to carry out surface Hardening Treatment, manual operation external force
F EBe random variation, every pin secondary action is in the surging force of workpiece surface
F' also with external force
F EChange, can not guarantee the homogeneity and the consistence of surface Hardening Treatment.Simultaneously in whole impact process; Angle between striker pin and treat surface, other operating parameterss such as translational speed of impact gun; Rely on MC fully; Also be difficult to keep constant,, can not obtain the treat surface of quality uniformity so the existing impact gun of artificial hand-held carries out surface Hardening Treatment.
Adopt mechanized operation even also be pointed out that existing ultrasonic impact gun, thereby on impact gun, apply constant operation external force
F E, also be difficult to realize the quality uniformity and the stable surface processing.The random variation of moving resistance is processed surperficial complicacy and variety in addition during owing to ultrasonic impact gun work, and the very difficult temporal variation according to moving resistance and processed workpiece surface of conventional mechanical os is in time fed back and adjusted its operating physical force, operates external force
F EExcessive or too small situation often takes place, and especially when the spininess shock peening, the subsequent impacts pin is that striker pin is impacted on the surface crossed of shock treatment once more in front, and the shock point surface convex-concave degree of each striker pin of synchronization is different, operation external force
F EThe component that is distributed on each striker pin is also different, and excessive or too small component all can cause this striker pin to stop the impacting of workpiece surface, and the surperficial position that it is inswept will form untreated impact room district, cause the inhomogeneous of surface strengthening effect.So existing ultrasonic impact gun also is not suitable for mechanized operation and carries out surface treatment.
In addition, put on operation external force on the ultrasonic impact gun
F EContinuous variation, also can cause the continuous change of impact gun load, influence the work-ing life of impact gun.
Summary of the invention
The purpose of this invention is to provide a kind of ultrasonic surface strengthening impact head of built-in impact pin type that is applicable to mechanized operation; This impact head is under mechanical grip; The impact head movement locus of cooperative mechanical clamping, movement velocity system and normal direction are followed the trail of automatic control system, can be to plane, permanent curvature surface and the ultrasound-enhanced processing of curvature surface workpiece uniformity continuously arbitrarily.It is too responsive to operation external force to overcome existing ultrasonic impact gun, only is fit to the problem of artificial hand-held, has eliminated the Random Effect of operation external force impact effect.
The technical scheme that the present invention adopts is: a kind of ultrasonic surface strengthening impact head of built-in pin type that is applicable to mechanized operation, and it comprises orienting sleeve and striker pin, striker pin is set in place in the pilot hole on orienting sleeve.Said striker pin is that ladder is cylindrical, and its length is about 2 times of the pilot hole degree of depth, and cascaded surface is above cylindrical for slightly; Cylindrical for carefully below the cascaded surface, thin cylindrical section upper semisection suit returning spring, lower semisection insert in the pilot hole; The returning spring upper end terminates in the striker pin cascaded surface; The lower end terminates in the orienting sleeve upper surface, and returning spring makes end in contact under striker pin upper end and the anvil iron, and the length that the assurance striker pin is inserted pilot hole is less than pilot hole degree of depth 0-5 μ m.
Said orienting sleeve adopts the planar end orienting sleeve, on the planar end orienting sleeve, is provided with a plurality of equally distributed pilot holes.The axis of pilot hole is vertical with the lower surface of orienting sleeve.
Said orienting sleeve adopts circular arc end face orienting sleeve, on circular arc end face orienting sleeve, is provided with the evenly distributed pilot hole of a row.The axis of pilot hole is vertical at the intersection point place with the circular arc lower surface of orienting sleeve.
Said orienting sleeve adopts vertex of a cone facet orienting sleeve, on vertex of a cone facet orienting sleeve, is provided with a pilot hole.The axis of pilot hole is vertical with the lower surface of orienting sleeve.
Adopt the striker pin in the pilot hole that is built in of technique scheme; Freely contact or do not contact with pending workpiece surface; The operation external force that acts on the impact gun is all born by the orienting sleeve lower surface, and striker pin puts on the reactive force on processed workpiece surface, only with impact gun self parameter correlation; The inferior surging force of the every pin of striker pin all can guarantee identical, realizes the surface Hardening Treatment of uniformity.Striker pin acts on the power on processed workpiece surface; Irrelevant with operation external force, the impact gun load is stable, helps prolonging impact gun work-ing life; Satisfy mechanical grip, the requirement of control automatically; Ultrasonic surface strengthening is accomplished in suitable mechanized operation, and described impact head is fit to artificial hand-held equally.
The orienting sleeve of impact head; Its lower surface can be designed to plane or permanent curvature surface as required; When the processed workpiece surface was the plane, the plane was adopted in the orienting sleeve lower surface, when the processed workpiece surface is permanent curvature surface; The curved surface with the workpiece surface same curvature is adopted in the orienting sleeve lower surface; The pilot hole axis is all vertical at the intersection point place with the orienting sleeve lower surface all the time, and the impact head movement locus of cooperative mechanical clamping and movement velocity automatic control system realize the ultrasound-enhanced processing of plane or permanent curvature surface.The orienting sleeve of impact head; Its lower surface can be designed to only hold the vertex of a cone facet of single pilot hole as required; The pilot hole axis is vertical with the orienting sleeve lower surface all the time; The impact head movement locus of cooperative mechanical clamping, movement velocity system and normal direction are followed the trail of automatic control system, realize arbitrarily the ultrasound-enhanced processing of curvature surface continuously.
The invention has the beneficial effects as follows: this ultrasonic surface strengthening impact head of built-in pin type of mechanized operation that is applicable to comprises orienting sleeve, striker pin and is sleeved on the returning spring on the striker pin that striker pin is set in place in the pilot hole on orienting sleeve.The returning spring that is sleeved on the striker pin makes end in contact under striker pin upper end and the anvil iron, and the length that the assurance striker pin is inserted pilot hole is less than pilot hole degree of depth 0-5 μ m.This impact head is under mechanical grip; The impact head movement locus of cooperative mechanical clamping, movement velocity system and normal direction are followed the trail of automatic control system, can be to plane, permanent curvature surface and the ultrasound-enhanced processing of curvature surface workpiece surface uniformity continuously arbitrarily.It is too responsive to operation external force to have overcome existing ultrasonic impact gun, only is fit to the problem of artificial hand-held, has eliminated the Random Effect of operation external force impact effect.
Description of drawings
Fig. 1 is a kind of structure iron that is applicable to the ultrasonic surface strengthening impact head of built-in pin type of mechanized operation.
Fig. 2 is many striker pin planar end orienting sleeve synoptic diagram.
Fig. 3 is impact head and the workpiece relative movement synoptic diagram that adopts many striker pin planar end orienting sleeve.
Fig. 4 is single striker pin circular arc end face orienting sleeve synoptic diagram.
Fig. 5 is impact head and the workpiece relative movement synoptic diagram that adopts single striker pin circular arc end face orienting sleeve.
Fig. 6 is impact head and the workpiece relative movement synoptic diagram that adopts vertex of a cone facet orienting sleeve.
Among the figure: 1, impact head shell, 1A, cooperate section, 1B, place restrictions on boss, 1C, tilt the air port, 2, the joint nut; 3, set screw nut, 4, orienting sleeve, 4A, cooperate section, 4B, place restrictions on boss, 4C, pilot hole; 4-1, planar end orienting sleeve, 4-2, circular arc end face orienting sleeve, 4-3, vertex of a cone facet orienting sleeve, 5, returning spring, 6, striker pin; 7, ultrasonic impact gun shell, 8, horn, 9, processed workpiece, 10, anvil iron.
Embodiment
Below in conjunction with accompanying drawing the present invention is specified.
Fig. 1 shows a kind of structure iron that is applicable to the ultrasonic surface strengthening impact head of built-in pin type of mechanized operation.Impact head shell 1 comprises and cooperates section 1A, positive stop lug boss 1B and tilt air port 1C.Wherein cooperating section 1A outline is square, cooperates with impact gun shell 7 square inner bores, prevents its tangential rotation; Positive stop lug boss 1B inside and outside contour is circle; 6 tilt air port 1C and evenly arrange along impact head shell 1 circumference.The joint nut 2, outer annular knurl, in have screw thread, lower end that inner convex platform is arranged, in order to realize being connected of impact head shell 1 and ultrasonic impact gun shell 7.Horn 8 is joined with ultrasonic transducer, and transverter is fixed on the impact gun shell 7.Anvil iron 10 places between striker pin 6 and the horn 8, is fixed in horn 8 lower surfaces, does not damage because of striker pin 6 bumps with the protection horn.Striker pin 6 is that ladder is cylindrical, is the boundary with the cascaded surface, and epimere is than large diameter cylinder type, and hypomere is the circle with a smaller diameter cylindricality, and the lower surface is a semisphere.Set screw nut 3 is identical with joint nut's 2 structures, in order to realize being fixedly connected of orienting sleeve 4 and impact head shell 1.Orienting sleeve 4 is provided with pilot hole 4C regularly arranged, that cooperate with striker pin 6, and the quantity of pin hole and arrangement mode look horn 8 lower surface shapes and area is confirmed; The cooperation section 4A of orienting sleeve 4, its outline are circular, cooperate with impact head shell 1 endoporus; Positive stop lug boss 4B outline is circular; Pilot hole 4C internal surface and the thin cylindrical surface of striker pin 6 hypomeres remain and are slidingly matched.Returning spring 5 adds the upper semisection that is enclosed within thin cylindrical section below striker pin 6 cascaded surfaces; The upper end terminates in striker pin 6 cascaded surfaces; The lower end terminates in pilot hole 4C upper surface; Natural length(of wool) is to guarantee that under quiescent conditions striker pin 6 upper ends contact with anvil iron 10 lower surfaces, striker pin lower end and orienting sleeve lower surface apart from 0-5 μ m.
During assembling, the upper end with impact head shell 1 cooperates section 1A to insert in the lower end endoporus of impact gun shell 7 earlier, with joint nut 2 impact head shell 1 is connected with impact gun shell 7; Returning spring 5 is inserted in from the lower end of striker pin 6, again striker pin 6 lower ends is inserted among the guiding pin hole 4C of orienting sleeve 4; The cooperation section 4A of the orienting sleeve that installs striker pin 4 is inserted in the impact head shell 1 lower end endoporus, with set screw nut 3 itself and impact head shell 1 is fixedly connected again.
Embodiment 1
The plate shaped workpiece surface of article on plasma body hardfacing alloy coating carries out the ultrasonic impact intensified process.Adopt Fig. 2, the ultrasonic surface strengthening impact head of the built-in pin type in lower surface, plane shown in 3; Orienting sleeve 4 adopts planar end orienting sleeve 4-1; The lower surface of planar end orienting sleeve 4-1 is the plane; Be provided with 19 striker pin pilot hole 4C with the lower surface arranged vertical, each hole is equipped with the striker pin 6 that diameter is 2 mm.When the striker pin 6 after the assembling is static under returning spring 5 effects; Striker pin 6 upper ends be fixed on horn 8 free-ended anvil iron 10 lower surfaces and contact; The lower end is built in the lower surface of planar end orienting sleeve 4-1, promptly and leave the gap of 0-5 μ m between processed workpiece 9 surfaces.
Processed workpiece 9 matrixes are 45 thick steel plates of 20 mm, and it is the Ni50 alloy powder coating of 4 mm that plasma body built-up welding machine built-up welding thickness is used on the surface, and machining is processed coatingsurface smooth, and the coatingsurface roughness Ra after the processing is 2.81 μ m, and Rz is 15.2 μ m.
Processed workpiece 9 is fixed on the numerical control table, NC table, and impact gun is installed on the numerical control table, NC table traversing carriage by guide rail-slide block mechanism, and impact gun can slide arbitrarily in vertical direction with slide block.Ultrasonic impact is placed on one jiao of workpiece surface with the impact gun impact head before handling, and impact gun deadweight and slide block weight act on workpiece surface through the orienting sleeve lower surface.During ultrasonic impact, open ultrasonic impact gun power supply and numerical control table, NC table power supply, impact gun is under the drive of support, and workpiece vertically moves relatively, and translational speed is 86 mm/min.The ultrasonic impact parameter is: electric current 2.64 A, power 0.58 kW, frequency of impact 18.7 kHz, horn amplitude are 35.2 μ m.After impact head moved to the workpiece the other end, cross feed 0.25 mm was again along vertically moving in the other direction.So repeatedly, all dispose until being processed the surface.
Overlay cladding surface after the shock treatment, the machining surface before its roughness and the processing is basic identical, and the surface roughness Ra value is 2.6 μ m, and the Rz value is 15.5 μ m.Surface hardness MV is by the HV before impacting
1 N5.35 GPa is increased to HV
1 N6.30 GPa.Overlay cladding surface residual stress MV by before impacting+610 MPa reduce to+200 MPa.Satisfied engine request.
Embodiment 2
AISI 304 austenitic stainless steel cylindrical shaft spares are carried out ultrasonic impact surface strengthening pre-treatment before the electrodeposited chromium.Adopt Fig. 4, the ultrasonic surface strengthening impact head of the built-in pin type in circular arc lower surface shown in 5, orienting sleeve 4 adopts circular arc end face orienting sleeve 4-2, and the arc surface of circular arc end face orienting sleeve 4-2 is with processed workpiece 9 cylindrical surface same curvature to be arranged
HalfThe cylindrical surface.Circular arc end face orienting sleeve 4-2 is provided with 5 striker pin pilot hole 4C that are arranged in parallel, and the axis of striker pin pilot hole 4C is vertical at the intersection point place with the circular arc end face.It is 2 mm striker pin 6 that each hole is equipped with diameter.In returning spring 5 effects down, striker pin 6 upper ends contacted with being fixed on horn 8 free-ended anvil iron 10 lower surfaces when the striker pin 6 after the assembling was static, lower end and orienting sleeve 4 lower surfaces, and promptly processed workpiece 9 is surperficial freely contacts.
Processed workpiece 9 is the axle part of Ф 40 * 150 mm, and state is that turning processing+vacuum solid solution is handled.
To be processed cylindrical shaft spare and clamp with the numerical control table, NC table chuck, impact gun is installed on the numerical control table, NC table traversing carriage by guide rail-slide block mechanism, and impact gun can slide arbitrarily in vertical direction with slide block.Before ultrasonic impact was handled, impact gun moved to the top of cylindrical shaft spare one end, and made that end curved surface and workpiece cylindrical surface match under the orienting sleeve.The weight of impact gun deadweight and slide block acts on workpiece surface through end curved surface under the orienting sleeve.During ultrasonic impact, open impact gun power supply and numerical control table, NC table power supply, the axle part begins rotation with chuck, and impact gun relative axle part under support drives vertically moves.Translational speed is 2 mm/min.The ultrasonic impact parameter is: electric current 2.26 A, power 0.50 kW, frequency of impact 17.8 kHz, horn amplitude are 30 μ m.When impact head moves to the other end from workpiece one end, shock peening finishes.
Workpiece surface roughness Ra is 0.62 μ m after the shock treatment, and Rz is 3.31 μ m.Workpiece surface primary fully austenitic structure has 95.8% to change high hard, attrition resistant martensitic phase tissue into.Surface hardness MV is by original HV
0.1 N2.35 GPa is increased to HV
0.1 N4.60 GPa, surface residual stress MV is reduced to-580 MPa by+150 MPa.Satisfied the pretreated engine request of electrodeposited chromium front surface.
Embodiment 3
H13 martensitic steel workpiece spherical crown surface is carried out ultrasonic impact surface strengthening pre-treatment before the nitriding.Adopt the ultrasound-enhanced impact head of the built-in pin type in vertex of a cone facet lower surface shown in Figure 6; Orienting sleeve 4 adopts vertex of a cone facet orienting sleeve 4-3; Vertex of a cone facet orienting sleeve 4-3 lower surface is for only holding the vertex of a cone facet of 1 pilot hole 4C; Be designed with 1 striker pin pilot hole 4C along conical centre's line, it is the striker pin 6 of 5 mm that diameter is installed in the hole.Under returning spring 5 effects, striker pin 6 upper ends contacted with being fixed on horn 8 free-ended anvil iron 10 lower surfaces when the striker pin 6 after the assembling was static, and the gap of 2-5 μ m is promptly left in lower end and orienting sleeve 4 lower surfaces between processed workpiece 9 surfaces.
Processed workpiece 9 spherical crown surface radius of curvature R are 150 mm, spherical crown diameter 100 mm, and high 38 mm, workpiece was a quenching+Annealed Strip before ultrasonic impact was handled.
Processed workpiece 9 is clamped on the numerical control table, NC table, and impact gun is installed in the mechanical manipulator front end.Before the ultrasonic impact, the impact gun impact head is placed on the spherical crown surface central point, the operation external force of mechanical manipulator is all born by vertex of a cone facet orienting sleeve 4-3 lower end vertex of a cone facet.During ultrasonic impact, open ultrasonic impact gun power supply and numerical control table, NC table power supply, utilize the mechanical manipulator Completion Techniques, make striker pin accomplish scanning the spherical crown surface to tracking, movement locus and movement velocity control.Striker pin sweep trace speed is 58 mm/min, and scanning overlap coefficient is 92%.The ultrasonic impact processing parameter is: electric current 2.0 A, power 0.44 kW, frequency of impact 17.8 kHz, horn amplitude are 26.4 μ m.
The workpiece that the process ultrasonic impact is handled is at 570 ℃ of plasma nitridation 1 h, and obtaining nitrided case depth is 50.5 μ m, and microhardness is HV
0.1 N11.02 GPa, shock treatment workpiece more not, nitrided case hardness has improved HV
0.1 N1.19 GPa, the degree of depth has increased by 19.3 μ m, has improved nitriding efficient greatly, has satisfied nitriding front surface pre-treatment requirement.
Claims (4)
1. ultrasonic surface strengthening impact head of built-in pin type that is applicable to mechanized operation, it comprises orienting sleeve (4) and striker pin (6), striker pin (6) is set in place in the pilot hole (4C) on orienting sleeve (4); It is characterized in that: said striker pin (6) is cylindrical for ladder; Its length is 2 times of pilot hole (4C) degree of depth, and cascaded surface is above cylindrical for slightly, and is cylindrical for carefully below the cascaded surface; Thin cylindrical section upper semisection suit returning spring (5); Lower semisection inserts in the pilot hole (4C), and returning spring (5) upper end terminates in striker pin (6) cascaded surface, and the lower end terminates in orienting sleeve (4) upper surface; Striker pin (6) upper end and anvil iron (10) is end in contact down, and the length that guarantees striker pin (6) insertion pilot hole (4C) is less than pilot hole (4C) degree of depth 0-5 μ m.
2. a kind of ultrasonic surface strengthening impact head of built-in pin type that is applicable to mechanized operation according to claim 1; It is characterized in that: said orienting sleeve (4) adopts planar end orienting sleeve (4-1); On planar end orienting sleeve (4-1), be provided with a plurality of equally distributed pilot holes (4C), the axis of pilot hole (4C) is vertical with the lower surface of orienting sleeve (4).
3. a kind of ultrasonic surface strengthening impact head of built-in pin type that is applicable to mechanized operation according to claim 1; It is characterized in that: said orienting sleeve (4) adopts circular arc end face orienting sleeve (4-2); On circular arc end face orienting sleeve (4-2), be provided with the evenly distributed pilot hole (4C) of a row, the axis of pilot hole (4C) is vertical at the intersection point place with the circular arc lower surface of orienting sleeve (4).
4. a kind of ultrasonic surface strengthening impact head of built-in pin type that is applicable to mechanized operation according to claim 1; It is characterized in that: said orienting sleeve (4) adopts vertex of a cone facet orienting sleeve (4-3); On vertex of a cone facet orienting sleeve (4-3), be provided with a pilot hole (4C), the axis of pilot hole (4C) is vertical with the lower surface of orienting sleeve (4).
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103074481A (en) * | 2013-02-04 | 2013-05-01 | 天津天东恒科技发展有限公司 | Stepped ultrasonic impact needle device and application thereof |
| CN103264356A (en) * | 2013-05-27 | 2013-08-28 | 天津天东恒科技发展有限公司 | Multi-needle type impacting head for ultrasonic impacting gun and design method of impacting head |
| CN105887705A (en) * | 2016-06-21 | 2016-08-24 | 彭五四 | Horizontal concrete automatic nailing device |
| CN107012305A (en) * | 2017-03-24 | 2017-08-04 | 江苏大学 | A kind of ultrasonic coldworking strengthened method and device of structural member connecting hole |
| CN107028643A (en) * | 2016-02-03 | 2017-08-11 | 深圳迈瑞生物医疗电子股份有限公司 | A kind of ultrasonic transduction device |
| CN108555528A (en) * | 2018-04-07 | 2018-09-21 | 大连理工大学 | A kind of explosive valve stress bolt weakens rooved face ultrasonic implement treatment device and its working method |
| CN108559827A (en) * | 2018-04-10 | 2018-09-21 | 天津中德应用技术大学 | Hand-held ultrasound impact device stabilising arrangement |
| CN110280884A (en) * | 2019-07-29 | 2019-09-27 | 吉林大学 | The ultrasonic impact toughening connector of groove addition alloy powder |
| CN111485096A (en) * | 2020-06-02 | 2020-08-04 | 香河华美齿轮有限公司 | By means for reducing stress in gear blanks |
| CN111793749A (en) * | 2020-07-23 | 2020-10-20 | 大连理工大学 | Processing method for enhancing structural stability of stator shielding sleeve of nuclear main pump by ultrasonic impact |
| CN114260661A (en) * | 2022-01-28 | 2022-04-01 | 重庆建设工业(集团)有限责任公司 | Manufacturing method of machine gun firing pin special for unmanned combat platform |
| CN115319401A (en) * | 2022-07-26 | 2022-11-11 | 华东理工大学 | Telescopic rotary type ultrasonic multi-processing head, processing device and processing method |
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Cited By (19)
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| CN103074481A (en) * | 2013-02-04 | 2013-05-01 | 天津天东恒科技发展有限公司 | Stepped ultrasonic impact needle device and application thereof |
| CN103264356A (en) * | 2013-05-27 | 2013-08-28 | 天津天东恒科技发展有限公司 | Multi-needle type impacting head for ultrasonic impacting gun and design method of impacting head |
| CN104802096A (en) * | 2013-05-27 | 2015-07-29 | 天津天东恒科技发展有限公司 | Method for designing multi-pin peening head for ultrasonic peening gun |
| CN103264356B (en) * | 2013-05-27 | 2015-12-02 | 天津天东恒科技发展有限公司 | A kind of multi-needle impact head for ultrasonic impact gun and method for designing thereof |
| CN104802096B (en) * | 2013-05-27 | 2017-04-05 | 天津天东恒科技发展有限公司 | A kind of method for designing of multi-needle impact head for ultrasonic impact gun |
| CN107028643A (en) * | 2016-02-03 | 2017-08-11 | 深圳迈瑞生物医疗电子股份有限公司 | A kind of ultrasonic transduction device |
| CN105887705A (en) * | 2016-06-21 | 2016-08-24 | 彭五四 | Horizontal concrete automatic nailing device |
| CN107012305B (en) * | 2017-03-24 | 2018-11-06 | 江苏大学 | A kind of ultrasonic coldworking strengthened method and device of structural member connecting hole |
| CN107012305A (en) * | 2017-03-24 | 2017-08-04 | 江苏大学 | A kind of ultrasonic coldworking strengthened method and device of structural member connecting hole |
| CN108555528A (en) * | 2018-04-07 | 2018-09-21 | 大连理工大学 | A kind of explosive valve stress bolt weakens rooved face ultrasonic implement treatment device and its working method |
| CN108559827A (en) * | 2018-04-10 | 2018-09-21 | 天津中德应用技术大学 | Hand-held ultrasound impact device stabilising arrangement |
| CN110280884A (en) * | 2019-07-29 | 2019-09-27 | 吉林大学 | The ultrasonic impact toughening connector of groove addition alloy powder |
| CN111485096A (en) * | 2020-06-02 | 2020-08-04 | 香河华美齿轮有限公司 | By means for reducing stress in gear blanks |
| CN111793749A (en) * | 2020-07-23 | 2020-10-20 | 大连理工大学 | Processing method for enhancing structural stability of stator shielding sleeve of nuclear main pump by ultrasonic impact |
| CN111793749B (en) * | 2020-07-23 | 2022-07-22 | 大连理工大学 | Processing method for enhancing structural stability of stator shielding sleeve of nuclear main pump by ultrasonic impact |
| CN114260661A (en) * | 2022-01-28 | 2022-04-01 | 重庆建设工业(集团)有限责任公司 | Manufacturing method of machine gun firing pin special for unmanned combat platform |
| CN114260661B (en) * | 2022-01-28 | 2023-03-14 | 重庆建设工业(集团)有限责任公司 | Manufacturing method of machine gun firing pin special for unmanned combat platform |
| CN115319401A (en) * | 2022-07-26 | 2022-11-11 | 华东理工大学 | Telescopic rotary type ultrasonic multi-processing head, processing device and processing method |
| CN115319401B (en) * | 2022-07-26 | 2023-11-03 | 华东理工大学 | Telescopic rotary ultrasonic multi-processing head, processing device and processing method |
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