CN103264356B - A kind of multi-needle impact head for ultrasonic impact gun and method for designing thereof - Google Patents
A kind of multi-needle impact head for ultrasonic impact gun and method for designing thereof Download PDFInfo
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- CN103264356B CN103264356B CN201310201655.0A CN201310201655A CN103264356B CN 103264356 B CN103264356 B CN 103264356B CN 201310201655 A CN201310201655 A CN 201310201655A CN 103264356 B CN103264356 B CN 103264356B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C5/00—Devices or accessories for generating abrasive blasts
- B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
- B21D31/06—Deforming sheet metal, tubes or profiles by sequential impacts, e.g. hammering, beating, peen forming
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses a kind of multi-needle impact head for ultrasonic impact gun and method for designing thereof, by ultrasonic transformer end face, striker pin cover plate and striker pin three part composition, be full of into the Kong Zhen of column-row arrangement in the effective coverage of ultrasonic transformer end face with striker pin cover.The present invention realizes the installation of multiple striker pin, and more existing impact head can increase work efficiency 300 ~ 400%, and its impact strength improves nearly 5%, can effectively improve the stress corrosion cracking existed in Welding Structure, buckling deformation, the problems such as shortening fatigue life.
Description
Technical field
The present invention relates to metal-surface nano technical field, more particularly, relate to a kind of ultrasonic impact (shot-peening) rifle multi-needle impact head and method for designing thereof, the fields such as stress corrosion resistant, straightening, elimination residual stress, metal-surface nano can be widely used in.
Background technology
In process of metal working, metal solder is a kind of processing method conventional in process, metal material is according to shape, after size is welded, stress due to toe of weld is concentrated and the effect of the factor such as residual-tensile stress, the fatigue behaviour of usual welding point is well below base metal, the normal crack initiation of solder joint fatigue crackle is in welding toe of joint, cause thus as offshore oil production platform, bridge, rolling stock, boats and ships, the large welded structures part accidents such as aircraft occur often, to the personal safety of people, work, travelling, life, the aspect bands such as property serve serious loss and impact.Therefore, the difficult problem that the fatigue strength improving welding point has become people will solve for a long time, usual people usually adopt hammering method, molten to amend the law, shot-peening method etc. improves the fatigue behaviour of welding point and structure, but the aspects such as its efficiency, effect and the scope of application all exist many shortcomings and problem.Recent people adopt magnetostriction type to have children outside the state plan percussion mechanism and process toe of weld, with improve welding point fatigue strength, extend its service life, but due to the loss of magnetostriction type ultrasonic impact device comparatively large, efficiency can only reach about 30%; Be easy to heating during operation, need to use water, wet goods liquid to cool; And product cost is very high, volume and weight is also comparatively large, inconvenient operation, is thus unfavorable for promoting in various workplace, using and operate.For improving Welding Structure anti-stress corrosion performance, eliminating residual stress and post welding distortion rectification, one of current universally recognized convenience, effective technology adopt the toe of weld position of ultrasonic impact device to metal solder position to process.
Application number be 02100037.9 Chinese invention patent disclose " a kind of piezoelectric-type ultrasonic impact device improving fatigue properties of welded joints ", substantially in current practical engineering application process adopt this type.Ultrasonic shot peening instrument output in the past and impact head are round, limit by geometry, and bead process efficiency is low, shows certain limitation in actual application.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, the deficiency in discussing for above-mentioned background technology in existing ultrasonic shot peening process, proposes a kind of new and effective ultrasonic shot peening rifle (ultrasonic impact gun) and uses multi-needle impact head.
Technical purpose of the present invention is achieved by following technical proposals:
A kind of multi-needle impact head for ultrasonic impact gun, by ultrasonic transformer end face, striker pin cover plate and striker pin three part composition,
The end of described ultrasonic transformer end face is directly connected with ultrasonic transformer screw thread, and its end face is provided with striker pin, and described striker pin is through the impact pin hole be arranged on striker pin cover plate, and described striker pin cover plate and ultrasonic impact gun rifle body are fixedly linked.The multi-needle impact head assembled, to ensure striker pin normal vibration, is positioned over ultrasonic impact gun front end, carries out bead to workpiece to be handled by the free gap wherein retaining appropriateness between striker pin and ultrasonic transformer end face.
The central authorities of described ultrasonic transformer end face and striker pin cover plate impact effective area (A), account for 70%-80% of whole ultrasonic transformer end face and striker pin cover plate area, for installing striker pin and getting impact pin hole; Arrange for the installing hole installed and fix at the periphery of striker pin cover plate.
Described striker pin selects two kinds of striker pin as shown in drawings, and wherein a kind of striker pin selects impact end to be round end, and tail end is round platform, and ultrasonic transformer end face contacts; Another kind of striker pin selects stepped cylindrical shape, and impact end and tail end are round end shape; Can select the position of installing in described ultrasonic transformer end face striker pin that pit is set, for installing striker pin.
Described impact gun can select half wave length ultrasound impact gun, the size of such impact gun transducer and ultrasonic transformer is respectively 1/4th of system resonance frequencies corresponding wavelength, also can select the long ultrasonic impact gun of all-wave, the size of impact gun transducer and ultrasonic transformer is respectively 1/2nd of system resonance frequencies corresponding wavelength.
In impact gun, the transducer of use can select piezoelectric ceramic transducer, and this transducer is made up of 2 to 12 even number sheet piezoelectric ceramics, also can select magnetostriction transducer.
Ultrasonic transformer end surface shape is rectangle, identical with striker pin cover plate shape, ultrasonic transformer end face and striker pin cover plate are of a size of a × b, the diameter of striker pin is d(and striker pin pin hole), between pin, gap is c, the striker pin quantity that then length direction can distribute (i) is a/ (d+c)+1, on width, the quantity (l) of striker pin is b/ (d+c)+1, the matrix of an i × l is defined thus at ultrasonic transformer end face and striker pin cover plate, in order to ensure the coverage rate of in rectilinear direction 100% and improve target efficiency, this matrix is rotated θ angle around central point, wherein the span of θ is 5-25 degree, the distribution map in final striker pin (hole) can be obtained according to impact effective area (A), now striker pin is full of with impact pin hole and impacts in effective coverage and become column-row arrangement, from the horizontal by θ angle, wherein the span of θ is 5-25 degree.
A method for designing for multi-needle impact head for ultrasonic impact gun, carry out according to following step:
Step 1, confirms the amplitude of striker pin and the smallest radial area s of ultrasonic transformer;
Step 2, according to the radial area ratio of ultrasonic transformer face area and ultrasonic transformer, (be designated as r) to increase and be twice, the amplitude of striker pin is decreased to original 1/4th, calculates the maximum area S of corresponding ultrasonic transformer end face;
Step 3, according to maximum area S and the restriction of impact gun rifle shell size of ultrasonic transformer end face, confirm that ultrasonic transformer end face length and width are of a size of a × b, now the diameter of striker pin is d, between striker pin pin, gap is c, the striker pin quantity that then can distribute in the longitudinal direction is (i) a/ (d+c)+1, and on width, the quantity (l) of striker pin is b/ (d+c)+1, can form the striker pin matrix of i × l at ultrasonic transformer end face;
Step 4, striker pin matrix step 3 obtained rotates θ angle around ultrasonic transformer end face central point, and wherein the span of θ is 5-25 degree, and now whole striker pin matrix and horizontal direction present angle theta;
Step 5, be set in the region of ultrasonic transformer end face central authorities for impacting effective area (being designated as A), account for 70%-80% of whole ultrasonic transformer face area, whole striker pin matrix is behind over-rotation θ angle, and the striker pin matrix falling into this impact effective area is the distribution matrix of last striker pin at ultrasonic transformer end face; In like manner on striker pin cover plate, form the impact pin hole corresponding to striker pin distribution matrix on ultrasonic transformer end face.
Wherein said ultrasonic transformer face area is the face area for installing striker pin, and the radial area of described ultrasonic transformer is that the radial cross-section of ultrasonic transformer amasss, as shown in Figure 8.
Compared with prior art, utilize technical scheme of the present invention that multiple striker pin (namely forming the distribution matrix of striker pin) can be set on the impact gun of different size, owing to adopting multiple striker pin, can process more large area at one time when carrying out ultrasonic impact (shot-peening) after using ultrasonic shot peening multi-needle impact head of the present invention, not only can increase substantially shot-peening efficiency (round number of times and the time of staying can be reduced to the sample of same size), and impact strength improves nearly 5%, the homogenization to treatment effect in the same area can also be ensured, can effectively improve the stress corrosion cracking existed in Welding Structure, buckling deformation, the problems such as shortening fatigue life.
Accompanying drawing explanation
Fig. 1 is the ultrasonic transformer end view of multi-needle impact head for ultrasonic impact gun of the present invention.
Fig. 2 is the striker pin cover plate schematic diagram of multi-needle impact head for ultrasonic impact gun of the present invention.
Fig. 3 is a kind of striker pin schematic diagram of multi-needle impact head for ultrasonic impact gun of the present invention.
Fig. 4 is the another kind of striker pin schematic diagram of multi-needle impact head for ultrasonic impact gun of the present invention.
Fig. 5 is the installation diagram of multi-needle impact head for ultrasonic impact gun of the present invention, and wherein 1 is striker pin, and 2 is striker pin cover plate, and 3 is ultrasonic transformer end face.
Fig. 6 is the installation diagram cross section view of multi-needle impact head for ultrasonic impact gun of the present invention, and wherein 1 is striker pin, and 2 is striker pin cover plate, and 3 is ultrasonic transformer end face.
Fig. 7 in the present invention ultrasonic transformer end face, striker pin cover plate is arranged the step schematic diagram impacting pin hole, and wherein A is for impacting effective area, and ultrasonic transformer end face and striker pin cover plate are of a size of a × b, and the diameter of striker pin is d, and between pin, gap is c.
Fig. 8 is ultrasonic transformer face area and the radial area schematic diagram of ultrasonic transformer in the present invention, and wherein ultrasonic transformer end face is for installing striker pin, is fixedly connected with below ultrasonic transformer end face with ultrasonic transformer, and the radial cross-section of ultrasonic transformer amasss as the radial area of ultrasonic transformer.
Detailed description of the invention
Further technical scheme of the present invention is described in detail below in conjunction with the drawings and specific embodiments.
As shown in accompanying drawing 1-6, multi-needle impact head for ultrasonic impact gun of the present invention, comprises striker pin 1, striker pin cover plate 2, ultrasonic transformer end face 3.The end of described ultrasonic transformer end face is directly connected with ultrasonic transformer screw thread, and its end face is provided with striker pin, and described striker pin is through the pin hole be arranged on striker pin cover plate, and described striker pin cover plate and ultrasonic impact gun rifle body are fixedly linked.The multi-needle impact head assembled, to ensure striker pin normal vibration, is positioned over ultrasonic impact gun front end, carries out bead to workpiece to be handled by the free gap wherein retaining appropriateness between striker pin and ultrasonic transformer end face.
The central authorities of described ultrasonic transformer end face and striker pin cover plate impact effective area (A), account for 70%-80% of whole ultrasonic transformer end face and striker pin cover plate area, for installing striker pin and getting impact pin hole; Arrange for the installing hole installed and fix at the periphery of striker pin cover plate.
Described striker pin selects two kinds of striker pin as shown in drawings, and wherein a kind of striker pin selects impact end to be round end, and tail end is round platform, and ultrasonic transformer end face contacts; Another kind of striker pin selects stepped cylindrical shape, and impact end and tail end are round end shape; Can select the position of installing in described ultrasonic transformer end face striker pin that pit is set, for installing striker pin.
Described impact gun can select half wave length ultrasound impact gun, the size of such impact gun transducer and ultrasonic transformer is respectively 1/4th of system resonance frequencies corresponding wavelength, also can select the long ultrasonic impact gun of all-wave, the size of impact gun transducer and ultrasonic transformer is respectively 1/2nd of system resonance frequencies corresponding wavelength.
In impact gun, the transducer of use can select piezoelectric ceramic transducer, and this transducer is made up of 2 to 12 even number sheet piezoelectric ceramics, also can select magnetostriction transducer.
Ultrasonic transformer end surface shape is rectangle, identical with striker pin cover plate shape, as shown in Figure 7, ultrasonic transformer end face and striker pin cover plate are of a size of a × b, the diameter of striker pin is d(and striker pin pin hole), between pin, gap is c, the striker pin quantity that then length direction can distribute (i) is a/ (d+c)+1, on width, the quantity (l) of striker pin is b/ (d+c)+1, the matrix of an i × l is defined thus at ultrasonic transformer end face and striker pin cover plate, in order to ensure the coverage rate of in rectilinear direction 100% and improve target efficiency, this matrix is rotated θ angle around central point, wherein the span of θ is 5-25 degree, the distribution map in final striker pin (hole) can be obtained according to impact effective area (A), now striker pin is full of with impact pin hole and impacts in effective coverage and become column-row arrangement, from the horizontal by θ angle, wherein the span of θ is 5-25 degree.
Utilize technical scheme of the present invention that the position of 40 striker pin is set on the effective coverage of ultrasonic transformer end face and striker pin cover plate, adopt full wavelength ultrasonic impact gun and magnetostriction transducer, owing to adopting technical scheme of the present invention, the quantity of striker pin increases 40, drastically increases the treatment effeciency of ultrasonic shot peening (i.e. ultrasonic impact).Experiment proves, the more existing impact head of the present invention can increase work efficiency 300 ~ 400%, and its impact strength improves nearly 5%.
Carry out ultrasonic process for after Welded, weld seam is 15 × 6mm, electric current 0.8-2.5A, the time of staying is that 1s(is namely in the time of staying of everywhere), round number of times is 3, after orthopedic, the crystal grain on sample top layer there occurs obvious plastic deformation, along being that 45 degree of directions arrange with surface; After welding, the hardness of weld metal zone have dropped 12% relative to mother metal, and after orthopedic, from surface within the scope of surface, edge downwards 1.5mm, hardness number is improved, and reaches maximum 75 at 0.3mm right position; Relative to mother metal, the yield strength of welding point and tensile strength have dropped about 7%, and percentage elongation declines more, is about 57.5%.Orthopedic rear joint yield strength and tensile strength improve 3.4% and 26.5% respectively relative to as-welded, and percentage elongation have dropped 52.6%.
Above to invention has been exemplary description; should be noted that; when not departing from core of the present invention, any simple distortion, amendment or other those skilled in the art can not spend the equivalent replacement of creative work all to fall into protection scope of the present invention.
Claims (6)
1. a multi-needle impact head for ultrasonic impact gun, by ultrasonic transformer end face, striker pin cover plate and striker pin three part composition, the end of described ultrasonic transformer end face is directly connected with ultrasonic transformer screw thread, its end face is provided with striker pin, described striker pin is through the striker pin pin hole be arranged on striker pin cover plate, described striker pin cover plate and ultrasonic impact gun rifle body are fixedly linked, it is characterized in that, the central authorities of described ultrasonic transformer end face and striker pin cover plate impact effective area, account for 70%-80% of whole ultrasonic transformer end face and striker pin cover plate area, described striker pin and striker pin pin hole are full of and impact in effective coverage and become column-row arrangement, striker pin and the striker pin pin hole of described column distribution of embarking on journey finally are determined according to following step:
Step 1, confirms the amplitude of striker pin and the smallest radial area s of ultrasonic transformer;
Step 2, increases according to the radial area ratio of ultrasonic transformer face area and ultrasonic transformer and is twice, and the amplitude of striker pin is decreased to original 1/4th, calculates the maximum area S of corresponding ultrasonic transformer end face;
Step 3, according to maximum area S and the restriction of impact gun rifle shell size of ultrasonic transformer end face, confirm that ultrasonic transformer end face length and width are of a size of a × b, now the diameter of striker pin is d, between striker pin pin, gap is c, the striker pin quantity i that then can distribute in the longitudinal direction is a/ (d+c)+1, and on width, the quantity l of striker pin is b/ (d+c)+1, can form the striker pin matrix of i × l at ultrasonic transformer end face;
Step 4, striker pin matrix step 3 obtained rotates θ angle around ultrasonic transformer end face central point, and wherein the span of θ is 5-25 degree, and now whole striker pin matrix and horizontal direction present angle theta;
Step 5, be set in the region of ultrasonic transformer end face central authorities for impacting effective area, account for 70%-80% of whole ultrasonic transformer face area, whole striker pin matrix is behind over-rotation θ angle, and the striker pin matrix falling into this impact effective area is the distribution matrix of last striker pin at ultrasonic transformer end face; In like manner on striker pin cover plate, form the impact pin hole corresponding to striker pin distribution matrix on ultrasonic transformer end face.
2. a kind of multi-needle impact head for ultrasonic impact gun according to claim 1, is characterized in that, described ultrasonic impact gun selects half wave length ultrasound impact gun, and wherein the size of transducer and ultrasonic transformer is respectively 1/4th of system resonance frequencies corresponding wavelength; Or full wavelength ultrasonic impact gun, wherein the size of transducer and ultrasonic transformer is respectively 1/2nd of system resonance frequencies corresponding wavelength.
3. a kind of multi-needle impact head for ultrasonic impact gun according to claim 2, is characterized in that, in described ultrasonic impact gun, the transducer of use is piezoelectric ceramic transducer or magnetostriction transducer.
4. a kind of multi-needle impact head for ultrasonic impact gun according to claim 1, is characterized in that, described striker pin selects impact end to be round end, and tail end is round platform.
5. a kind of multi-needle impact head for ultrasonic impact gun according to claim 1, is characterized in that, described striker pin selects stepped cylindrical shape, and impact end and tail end are round end shape.
6. a kind of multi-needle impact head for ultrasonic impact gun according to claim 1, is characterized in that, the position that on described ultrasonic transformer end face, striker pin is installed is provided with pit.
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| CN201310201655.0A CN103264356B (en) | 2013-05-27 | 2013-05-27 | A kind of multi-needle impact head for ultrasonic impact gun and method for designing thereof |
| CN201510172354.9A CN104802096B (en) | 2013-05-27 | 2013-05-27 | A kind of method for designing of multi-needle impact head for ultrasonic impact gun |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111167887A (en) * | 2020-01-21 | 2020-05-19 | 中国科学院宁波材料技术与工程研究所 | Ultrasonic strengthening orthopedic device |
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| CN104846174B (en) * | 2015-05-22 | 2017-07-07 | 南通中远船务工程有限公司 | A kind of cylindrical leg weld residual stress cancellation element and method |
| CN105112645A (en) * | 2015-09-14 | 2015-12-02 | 南通大学 | Spiral-pressure type ultrasonic surface nanocrystallization device |
| CN107488778B (en) * | 2017-08-07 | 2019-06-25 | 蔡晋 | A kind of ultrasonic shot peening strengthening device |
| CN108239694B (en) * | 2018-02-24 | 2019-08-02 | 沈阳远大装备科技有限公司 | A kind of ultrasonic impact shot-blast unit |
| CN111215477A (en) * | 2020-01-21 | 2020-06-02 | 中国科学院宁波材料技术与工程研究所 | Ultrasonic strengthening orthopedic device and control method thereof |
| 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 |
| CN111876585B (en) * | 2020-07-29 | 2021-08-13 | 北京理工大学 | Sound wave reduction homogenization regulation and control device and method in welding residual stress generation process |
| CN112518594B (en) * | 2021-02-08 | 2021-05-11 | 四川大学 | Piezoelectric vibrator array type ultrasonic shot peening strengthening device |
| CN114107632A (en) * | 2021-12-11 | 2022-03-01 | 李军 | Welding bead residual stress relieving device and method |
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| CN104802096A (en) | 2015-07-29 |
| CN104802096B (en) | 2017-04-05 |
| CN103264356A (en) | 2013-08-28 |
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