CN115404436B - Ultrasonic acceleration-based surface strengthening device and method - Google Patents
Ultrasonic acceleration-based surface strengthening device and method Download PDFInfo
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- CN115404436B CN115404436B CN202210488905.2A CN202210488905A CN115404436B CN 115404436 B CN115404436 B CN 115404436B CN 202210488905 A CN202210488905 A CN 202210488905A CN 115404436 B CN115404436 B CN 115404436B
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- 238000005728 strengthening Methods 0.000 title claims abstract description 39
- 230000001133 acceleration Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 189
- 239000008188 pellet Substances 0.000 claims abstract description 155
- 239000002245 particle Substances 0.000 claims abstract description 44
- 238000002347 injection Methods 0.000 claims description 21
- 239000007924 injection Substances 0.000 claims description 21
- 239000006187 pill Substances 0.000 claims description 13
- 238000003860 storage Methods 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229910052796 boron Inorganic materials 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims 6
- 239000010410 layer Substances 0.000 abstract description 11
- 238000005121 nitriding Methods 0.000 abstract description 8
- 238000005255 carburizing Methods 0.000 abstract description 6
- 238000005480 shot peening Methods 0.000 abstract description 4
- 238000005271 boronizing Methods 0.000 abstract description 3
- 239000002344 surface layer Substances 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 14
- 238000005422 blasting Methods 0.000 description 6
- 238000011282 treatment Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/60—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using solids, e.g. powders, pastes
-
- 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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/04—Treatment of selected surface areas, e.g. using masks
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Nozzles (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a surface strengthening device and a method based on ultrasonic acceleration in the field of workpiece surface strengthening, wherein the output end of an amplitude transformer is connected with a piston rod, the piston rod extends into a pellet accelerating cylinder to move up and down, the lower part of the pellet accelerating cylinder is connected with a pellet conveying device capable of conveying pellets into the pellet accelerating cylinder, a powder particle layer positioned between a powder jet orifice and a powder receiving port is arranged below a pellet jet orifice at the lower end of the pellet accelerating cylinder, a workpiece is arranged right below the powder particle layer, the powder jet orifice is a horizontal outlet of a first air box, the powder receiving port is a horizontal inlet of a second air box, and powder particles can circulate along a route formed by the powder jet orifice, the powder receiving port, the outlet of the second air box and the lower inlet of the first air box; the shot ejected at high speed is impacted on the surface of the workpiece through the flowing powder particle layer, so that the shot is permeated into the surface layer of the workpiece, and the shot peening strengthening can be performed on the selected area of the surface of the workpiece, and meanwhile, the processes of carburizing, nitriding, boronizing and the like are finished, so that the surface quality of the part is strengthened more efficiently.
Description
Technical Field
The invention relates to the field of workpiece surface strengthening, in particular to a device and a method for strengthening the surface of a part by ultrasonic acceleration.
Background
The surface strengthening of parts is an important process in the actual part production process, is an important process for prolonging the service life of the parts, in the prior art, the surface strengthening technology is a plurality of, wherein the carburizing and nitriding technologies are common surface strengthening methods in the engineering field, and the workpiece is placed in a device furnace to be heated and insulated in the environment of carburizing medium or nitriding medium, so that carbon atoms or nitrogen atoms infiltrate into the surface layer of the workpiece to form a certain carbon concentration gradient or nitrogen concentration gradient, thereby achieving the purpose of strengthening the surface of the parts. Patent CN109249317B discloses a system for efficiently and uniformly processing various molded surfaces by ultrasonic shot blasting and a use method thereof, wherein the first vibration amplitude transformer and the second vibration amplitude transformer are utilized to realize axial-bending-torsion coupled vibration of a workpiece, so that the purpose of more uniform surface treatment during shot blasting is achieved. However, the method still belongs to the traditional ultrasonic shot peening strengthening and cannot bring obvious strengthening effect.
The Chinese patent publication No. CN110640638B discloses an ultrasonic strengthening processing device for the surface of a rolling body workpiece, wherein high-frequency ultrasonic vibration is utilized to beat the shot on the surface of the workpiece to be strengthened, and the shot can be recovered and continuously utilized under the action of rebound force only, so that the repeated strengthening of the part is realized. However, this processing method does not consider collision between the pellets when the pellets are repeatedly sprung, not only reduces the reinforcing efficiency, but also has a high possibility of damaging the apparatus.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a novel surface strengthening device and a strengthening method thereof based on ultrasonic acceleration, which improve the strengthening efficiency, can process special parts and strengthen parts locally.
The invention discloses a surface strengthening device based on ultrasonic acceleration, which achieves the technical purposes by the following technical means: the device comprises an ultrasonic generator, a transducer and a luffing rod, wherein the ultrasonic generator is connected with the luffing rod through the transducer, the output end of the luffing rod is connected with a piston rod, and the piston rod stretches into a projectile accelerating cylinder to move up and down; the lower part of the pellet accelerating cylinder is connected with a pellet conveying device capable of conveying pellets into the pellet accelerating cylinder, the lower end of the pellet accelerating cylinder is provided with a pellet injection outlet, a powder particle layer positioned between a powder injection port and a powder receiving port is arranged below the pellet injection outlet, a workpiece is arranged right below the powder particle layer, the powder injection port and the powder receiving port are horizontally arranged at the same height, the powder injection port is a horizontal outlet of a first air box, the powder receiving port is a horizontal inlet of a second air box, the powder particles can circulate along a route formed by the powder injection port, the powder receiving port, the outlet of the second air box and the lower inlet of the first air box, and the upper inlet of the first air box is connected with a powder box above the powder injection port.
Further, the lower inlet of the first air box is sequentially connected with the fourth powder conveying channel, the fifth air box, the third powder conveying channel, the fourth air box, the second powder conveying channel, the third air box, the first powder conveying channel and the second air box through pipelines, and the first air box, the second air box, the third air box and the fifth air box are arranged along four corners of the rectangle.
Further, the pellet conveying device comprises an air compressor, a pellet ejector, a pellet storage box and a pellet emission channel, wherein the output end of the air compressor is connected and communicated with the lower part of the pellet accelerating cylinder through the pellet emission channel, the pellet emission channel penetrates through the pellet ejector, the pellet storage box is connected above the pellet ejector, the pellet discharge hole is formed in the lower end of the pellet storage box, and the pellet discharge hole penetrates through the pellet ejector through a pipeline to be connected and communicated with the pellet emission channel.
The invention relates to a surface strengthening method of a surface strengthening device based on ultrasonic acceleration, which comprises the following steps:
step one: the passage between the powder box and the first bellows is opened and the powder falls into the first bellows.
Step two: starting all the bellows, wherein powder is ejected from a powder ejection opening of the first bellows and enters the second bellows through the powder receiving opening towards the opposite powder receiving opening, and reaches the first bellows through a circulating route;
step three: simultaneously, the pellet conveying device and the ultrasonic generator work, pellets enter the pellet accelerating cylinder, and under the action of the ultrasonic generator, the piston rod slides up and down in the pellet accelerating cylinder to accelerate the pellets to be ejected downwards;
step four: the shot which is ejected downwards passes through the powder particle layer, the powder particles are attached to the lower end of the shot, and the surface of the workpiece is impacted to realize surface strengthening.
The invention has the beneficial effects that:
1. the shot ejected at high speed is used to impact the surface of the workpiece through the flowing powder particle layer, so that the shot is permeated into the surface layer of the workpiece, the shot peening can be performed on the selected area of the surface of the workpiece, and the treatment processes of carburizing, nitriding, boronizing and the like are finished at the same time, so that the shot peening is combined with the surface nitriding and nitriding, and the surface quality of the part is enhanced more efficiently.
2. According to the pellet conveying device in the device, the air compressor is used for blowing the pellets into the pellet accelerating cylinder at a high speed, the pellets can be automatically added into the pellet accelerating cylinder, and the pellets have a larger initial speed when entering the pellet accelerating cylinder, so that the accelerating time of the pellets in the pellet accelerating cylinder is reduced, and the surface strengthening efficiency of parts is improved.
3. Compared with the traditional carburizing, nitriding and boronizing methods, the method does not need heating and heat preservation, can carry out treatments such as carburizing and nitriding in room temperature environment, reduces the processing cost to a certain extent and reduces the energy consumption.
4. The invention can carry out carburization and nitridation treatment on the surface of the part, the processing area is optional, and compared with the traditional carburization and nitridation method, the invention provides more options in the scheme of processing the part.
Drawings
FIG. 1 is a schematic view of a surface strengthening device based on ultrasonic acceleration according to the present invention;
FIG. 2 is a schematic view of the apparatus of FIG. 1 in use for effecting surface strengthening of a workpiece by pellets and powder particles during processing;
in the figure: 1-a terminal control device; a 2-transducer; 3-an ultrasonic generator; 4-a shot storage box; 5-an amplitude transformer; 6-a pellet ejector; 7-an air compressor; 8-a shot firing channel; 9-a piston rod; 10-a pellet acceleration cylinder; 11-powder feed bin; 12-a first bellows; 13-fourth powder transfer channel; 14-powder injection ports; 15-a housing; a No. 16-fifth bellows; 17-No. three powder transport channels; 18-fourth bellows; 19-powder transfer channel number two; 20-a work platform support device; 21-a third bellows; 22-a mobile work platform; 23-workpiece; 24-clamping; 25-a powder receiving opening; 26-number one powder transport channel; 27-a second bellows; 28-shot; 29-powder particles.
Detailed Description
Referring to fig. 1, the surface strengthening device based on ultrasonic acceleration of the invention comprises a terminal control device 1, a pill accelerating device, a pill conveying device, a powder circulating system, a workpiece clamping device and the like. The pill accelerating device comprises an ultrasonic generator 3, a transducer 2, an amplitude transformer 5, a piston rod 9 and a pill accelerating cylinder 10. The ultrasonic generator 3 is fixed on the working platform, is connected with the terminal control device 1 through a control line, and is controlled by the terminal control device 1 to generate an ultrasonic signal. The transducer 2 is connected to the ultrasonic generator 3, receives a signal generated by the ultrasonic generator 3, and converts the signal into a vibration signal by an inverse piezoelectric effect. The amplitude transformer 5 is connected with the transducer 2 and is in a cylindrical rod shape, is connected with the signal output end of the transducer 2, receives the vibration signal of the transducer 2, amplifies the vibration signal, the output end of the amplitude transformer 5 is connected with the piston rod 9, and the amplitude transformer 5 converts the amplified vibration signal into the up-and-down sliding of the piston rod 9. The piston rod 9 extends into the pellet acceleration cylinder 10 and is matched with the pellet acceleration cylinder 10 to move up and down in the pellet acceleration cylinder 10.
Two piston rods 9 can be arranged according to the requirement, and the two piston rods 9 with the same structure are symmetrically distributed along the central axis of the amplitude changing rod 5. A piston rod 9 extends into a pellet acceleration cylinder 10, so that there are two pellet acceleration cylinders 10 of identical shape and construction, a piston rod 9 is matched with one pellet acceleration cylinder 10, the pellet acceleration cylinder 10 is a cylindrical cylinder, and the piston rod 9 moves up and down in the pellet acceleration cylinder 10. The lower end of the pill accelerating cylinder 10 is an outlet of the pill accelerating cylinder, an accelerating cylinder valve is arranged at the outlet, the accelerating cylinder valve is connected with the terminal control device 1 through a control line, and the terminal control device 1 controls the opening and closing of the accelerating cylinder valve.
The pellet conveying device is used for continuously conveying pellets into the pellet accelerating cylinder 10 and comprises an air compressor 7, a pellet ejector 6, a pellet storage box 4 and a pellet launching channel 8. The number of the pellet conveying devices corresponds to that of the piston rods 9, when the piston rods 9 are arranged in two, two sets of pellet conveying devices with identical shape, structure and function are symmetrically distributed along the central axis of the amplitude transformer 5, and each set of pellet conveying device comprises an air compressor 7, a pellet ejector 6, a pellet storage box 4 and a pellet emission channel 8.
The air compressor 7 is fixed on the working platform, the gas output end of the air compressor 7 is connected with the inlet end of the pellet launching channel 8, the outlet end of the pellet launching channel 8 is connected and communicated with the lower part of the pellet accelerating cylinder 10, and the connecting part is positioned below the piston rod 9, so that pellets entering the pellet accelerating cylinder 10 are always below the piston rod 9. The pellet emission channel 8 passes through the pellet ejector 6, the whole pellet ejector 6 is square, and the pellet ejector 6 and the air compressor 7 are fixed on the same working platform. The pellet bin 4 is connected to the top of pellet ejector 6, and pellet bin 4 is a cylinder bin, and its upper end has the pellet import, and the lower extreme is opened there is the pellet discharge gate, and the pellet discharge gate passes pellet ejector 6 through the pipeline, connects and communicates pellet emission passageway 8, and pellet discharge gate pipeline and pellet emission passageway 8 mutually perpendicular. The pipeline of the pellet launching channel 8 is a circular hollow pipeline, and the inner diameter of the pellet launching channel 8 from the inlet end to the end connected with the pellet discharge port is gradually reduced from large to small. The pellet discharge port is provided with a pellet discharge port valve, and the pellet discharge port valve is connected with the terminal control device 1 and is controlled by the terminal control device 1.
The main purpose of the powder circulation system is to mix or use separately powder particles such as C, N, B, which are circulated by a wind power system through the shot-accelerating cylinder 10 just below the shot-injection outlet. The powder circulation system comprises a powder feed box 11, a first air box 12, a fourth powder conveying channel 13, a shell 15, a fifth air box 16, a third powder conveying channel 17, a fourth air box 18, a second powder conveying channel 19, a third air box 21, a powder receiving port 25, a first powder conveying channel 26 and a second air box 27, all the air boxes are respectively connected with a terminal control device 1 through signal wires, and the terminal control device 1 can respectively control the start and stop of each air box. The casing 15 is square, and square baffles on the side surfaces of the periphery are connected with each other to form a square cavity, so as to protect each working part and provide supporting points for each working part, the upper end of the casing 15 is a square opening, and the lower end of the casing 15 is fixed at a working place. The first air box 12, the second air box 27, the third air box 21 and the fifth air box 16 are arranged along four corners of the rectangle, the fourth air box 18 is arranged at the middle between the third air box 21 and the fifth air box 16, and the first air box, the second air box, the third air box 21 and the fifth air box 16 are arranged on the same height and on the same side of the rectangle.
The powder box 11 is fixedly connected to the upper end of the side wall inside the shell 15, the powder box 11 is a square box, and single powder particles such as C, N, B or mixed powder particles are filled in the square box, and can enter from an opening at the upper end of the powder box 11. Below the powder box 11 is a bellows 12. The bellows 12 is also secured to the inner side wall of the housing 15.
The first bellows 12 has two vertical inlets and a horizontal outlet, namely a powder injection port 14, the upper inlet is connected with the outlet of the powder feed box 11, and a powder inlet valve is arranged at the upper inlet of the first bellows 12 and is connected with the terminal control device 1. The lower inlet of the first air box 12 is sequentially connected with a fourth powder conveying channel 13, a fifth air box 16, a third powder conveying channel 17, a fourth air box 18, a second powder conveying channel 19, a third air box 21, a first powder conveying channel 26 and a second air box 27 through pipelines,
the second bellows 27 has a horizontal inlet, i.e., a powder receiving opening 25, and the second bellows 27 is located on the opposite side of the first bellows 12, with the powder injection port 14 and the powder receiving opening 25 facing each other with a distance therebetween. A powder injection valve is provided at the powder injection port 14, a powder receiving valve is provided at the powder receiving port 25, and the powder injection valve and the powder receiving valve are connected to the terminal control device 1 via control lines, respectively. The powder receiving port 25 has the same structural shape as the powder injection port 14, and is arranged horizontally while maintaining the same height. The end of the powder jet 14 is in a horn-shaped structure, and when the first air box 12 and the second air box 27 work, powder particles circulate along the paths of the powder jet 14, the powder receiving opening 25, the outlet of the second air box 27 and the lower inlet of the first air box 12. The powder particles are ejected from the powder ejection opening 14 at a high speed, the powder receiving opening 25 is controlled by the second bellows 27 to absorb the powder particles ejected from the powder ejection opening 14, and the powder particles return to the first bellows 12 through the powder conveying channel, so that the powder particles circulate and form a powder particle circulation and conveying route from the second bellows 27 to the first bellows 12, specifically: the second bellows 27 operates to blow out powder particles sucked by the powder receiving port 25 from the outlet of the second bellows 27 into the first powder conveying passage 26, the lower end of the first powder conveying passage 26 is connected with the inlet of the third bellows 21, and a valve is installed in the middle section of the first powder conveying passage 26 and connected to the terminal control device 1 through a control line. The first bellows 12 is located under the second bellows 27, the side surface of the third bellows 21 is fixedly connected with the inner side wall of the housing 15, the third bellows 21 has the same structure as the second bellows 27, and also comprises an inlet and an outlet, the inlet is located under the outlet of the second bellows 27 and is connected with the first powder transmission channel 26, the powder particles 29 transmitted from the second bellows 27 are received, the outlet of the third bellows 21 is connected with the second powder transmission channel 19, the first powder transmission channel 19 is horizontally arranged and is connected with the outlet of the third bellows 21, the outlet end of the second powder transmission channel 19 is connected with the inlet of the fourth bellows 18, and a valve is arranged in the middle section of the second powder transmission channel 19 and is connected to the terminal control device 1 through a lead. The fourth bellows 18 is fixedly connected to the bottom surface inside the casing 15 and is located in the center portion of the bottom surface inside the casing 15, the fourth bellows 18 is identical to the third bellows 21 and comprises an inlet and an outlet, the inlet is connected with the second powder transmission channel 19 and is located at the same level with the outlet of the third bellows 21, the outlet of the fourth bellows 18 is connected with the third powder transmission channel 17, and a valve connected with the terminal control device 1 is installed in the middle section of the third powder transmission channel 17. The third powder conveying channel 17 and the second powder conveying channel 19 are positioned on the same horizontal line, one end of the third powder conveying channel is connected with the outlet of the fourth air box 18, the other end of the third powder conveying channel is connected with the inlet of the fifth air box 16, and a valve is arranged at the middle section and connected to the terminal control device 1 through a lead wire. The fifth bellows 16 is located under the first bellows 12 and is at the same level as the third bellows 21, the side surface of the fifth bellows 16 is fixedly connected to the inner side wall of the housing 15, the fifth bellows 16 also comprises an inlet and an outlet, the inlet is horizontally connected with the third powder transmission channel 17, the outlet of the fifth bellows 16 is vertically upward and connected with the fourth powder transmission channel 13, the fourth powder transmission channel 13 is perpendicular to the bottom surface of the housing 15 and parallel to the first powder transmission channel 26, the outlet of the fourth powder transmission channel 13 is connected with the lower inlet of the first bellows 12, and a valve is installed in the middle section of the fourth powder transmission channel 13 and connected to the terminal control device 1. The circulation system of the powder particles thus combined ensures that the flowing powder particles 29 always pass directly under the pellet acceleration cylinder 10.
The powder injection port 14 is spaced from the powder receiving port 25 by a horizontal distance of 180 to 200mm, and a region of the powder particles 29 flowing in this horizontal distance is formed to form a powder particle layer. The powder particle layer is directly below the shot-blasting outlet of the shot-accelerating cylinder 10, with a vertical distance of 40-70 mm from the shot-blasting outlet of the shot-accelerating cylinder 10.
The workpiece holding device includes a work platform support 20, a mobile work platform 22, and a clamp 24. The working platform supporting device 20 is a square supporting platform, the bottom surface of the working platform supporting device is contacted with the bottom surface inside the shell 15, but through holes for the powder conveying channel No. two 19, the air box No. four 18 and the powder conveying channel No. three 17 to pass through are reserved. The movable working platform 22 is located on the working platform supporting device 20, the movable working platform 22 is connected with the terminal control device 1 through a control line, and the terminal control device 1 controls the movable working platform 22 to drive the workpiece 23 to move left and right, front and back and up and down. The upper surface of the movable working platform 22 is fixedly provided with a clamp 24 for clamping a workpiece 23, and the workpiece 23 is directly below powder particles 29 between the first air box 12 and the second air box 27.
Referring to fig. 2, when the pellets 28 are ejected from the pellet acceleration cylinder 10 through the layer of powder particles 29, the pellets 28 move downward at a high speed v, attach the powder particles 29 to the lower end of the pellets 28, strike the work piece 23 at a very high speed v, and infiltrate the powder particles 29 attached to the lower end of the pellets 28 into the surface of the work piece 23.
Referring to fig. 1-2, when the surface enhancing device of the present invention is in an inactive state, all of the pellets 28 are in the pellet storage bin 4 and no pellets are present in the pellet firing chute 8 and the pellet acceleration cylinder 10. In addition, all the powder particles 29 are in the powder magazine 11. The surface strengthening is realized according to the following steps in working:
step one: the workpiece 23 is placed on the movable table 22 by clamping by the clamp 24, and the terminal control apparatus 1 operates to control the movable table 22 to move to the initial position.
Step two: the terminal control device 1 controls the opening of the powder inlet valve, opens the passage between the powder hopper 11 and the first bellows 12, and the powder falls into the first bellows 12.
Step three: the terminal control device 1 starts all bellows operation, i.e., the first bellows 12, the second bellows 27, the third bellows 21, the fourth bellows 18 and the fifth bellows 16, simultaneously, and simultaneously opens the valves of the powder ejection port, the receiving port and the valves on all the powder transfer passages. Powder is ejected from the powder ejection port 14 of the first air box 12 at a high speed, enters the second air box 27 from the powder receiving port 25 toward the opposite powder receiving port 25, the first air box 12 generates suction force for the powder to the inside of the air box, the second air box 27 blows the entered powder from the outlet of the second air box 27, the powder enters the first powder conveying channel 26 and the third air box 21 downwards, and the third air box 21 generates downward suction force for the powder in the first powder conveying channel 26 when working. The powder is then blown out by the operating No. three bellows 21, through the No. two powder transfer channels 19 into the No. four bellows 18, and the operating No. four bellows 18 creates an inward suction. Similarly, the powder returns to the first air box 12 through the fourth air box 18, the third powder conveying channel 17, the fifth air box 16 and the third powder conveying channel 13 in sequence, and reaches the first air box 12 through the circulation route to complete circulation.
Step four: simultaneously with the third step, the pellet conveying device works, the terminal control device 1 controls the opening of a valve at the outlet of the pellet storage box 4, and the falling speed of the pellets 28 from the pellet storage box 4 is controlled by controlling the opening size of the valve. Simultaneously starting the air compressor 7 and the ultrasonic generator 3, wherein the working power of the air compressor 7 is 2HP, the rotating speed is 3000rpm, the working pressure is 8bar, the exhaust capacity is 120L/min, and the working frequency of the ultrasonic generator 3 is 15-20KHZ. And simultaneously opens the valve at the outlet of the pellet acceleration cylinder 10.
The pellets fall into the pellet ejector 6, and meanwhile, high-pressure air blown out by the air compressor 7 enters the pellet ejector 6, so that the pellets 28 falling into the pellet ejector 6 are blown out at a high speed and enter the pellet accelerating cylinder 10 through the pellet launching channel 8. Under the action of the ultrasonic generator 3, the piston rod 9 in the pellet accelerating cylinder 10 slides up and down in the pellet accelerating cylinder 10, and the pellets 28 are impacted to accelerate downward. The terminal control device 1 detects the operation time of the ultrasonic generator 3, that is, the operation time of the pellet acceleration cylinder 10, and when the ultrasonic generator 3 is operated to reach a set one-time operation time threshold (for example, 3 s), the terminal control device 1 closes the valve at the outlet below the pellet acceleration cylinder 10, and the shot 28 stops being ejected downward. Then, the pellets 28 are transferred from the pellet shot blasting passage 8 into the pellet acceleration cylinder 10, thus completing one process. The acceleration is then repeated and the shot blasting channel 8 is ejected again, so that the shot 28 is ejected continuously by repeating the process a number of times. After the shot pellets 28 pass through the powder particle 29 layer downwards, the powder particles 28 are attached to the lower end of the pellets 28, and the surface of the workpiece 23 is impacted at a high speed so as to achieve the processing purpose.
Step five: when the surface of the processing area of the workpiece 23 reaches the set processing times, the terminal control device 1 controls the movable working platform 22 to move according to the set moving path, so that the area to be processed of the workpiece 23 moves to the processing position, and the processing is continued under the powder particles 29 until the surface processing area of the workpiece 23 is completely finished.
Claims (10)
1. The utility model provides a surface strengthening device based on ultrasonic acceleration, includes ultrasonic generator (3), transducer (2) and amplitude transformer (5), and ultrasonic generator (3) are connected amplitude transformer (5) through transducer (2), characterized by: the output end of the amplitude transformer (5) is connected with a piston rod (9), and the piston rod (9) stretches into the pellet accelerating cylinder (10) to move up and down; the lower part of the pill accelerating cylinder (10) is connected with a pill conveying device capable of conveying pills into the pill accelerating cylinder, the lower end of the pill accelerating cylinder (10) is provided with a pill spraying outlet, a powder particle layer positioned between a powder spraying outlet (14) and a powder receiving opening (25) is arranged below the pill spraying outlet, a workpiece is arranged right below the powder particle layer, the powder spraying outlet (14) and the powder receiving opening (25) are horizontally arranged at the same height, the powder spraying outlet (14) is a horizontal outlet of a first air box (12), the powder receiving opening (25) is a horizontal inlet of a second air box (27), and powder particles can circulate along a route formed by the powder spraying outlet (14), the powder receiving opening (25), the outlet of the second air box (27) and the lower inlet of the first air box (12), and the upper inlet of the first air box (12) is connected with the powder box (11) above the first air box;
the ultrasonic generator (3) is fixed on a working platform, the ultrasonic generator is connected with the terminal control device (1) through a control line, ultrasonic signals are controlled and generated by the terminal control device (1), the working time of the ultrasonic generator (3) is detected by the terminal control device (1), whether pellets are emitted downwards or not is controlled, a pellet discharge port valve is arranged at a pellet discharge port, the pellet discharge port valve is connected with the terminal control device (1), all bellows are controlled by the terminal control device (1) and are respectively connected with the terminal control device 1 through signal lines, the terminal control device 1 can respectively control the start and stop of each bellows, a powder injection valve is arranged at a powder injection port (14), a powder receiving valve is arranged at a powder receiving port, and the powder injection valve and the powder receiving valve are respectively connected with the terminal control device (1) through control lines.
2. The ultrasonic acceleration-based surface strengthening device of claim 1, wherein: the lower inlet of the first air box (12) is sequentially connected with a fourth powder conveying channel (13), a fifth air box (16), a third powder conveying channel (17), a fourth air box (18), a second powder conveying channel (19), a third air box (21), a first powder conveying channel (26) and a second air box (27) through pipelines, and the first air box (12), the second air box (27), the third air box (21) and the fifth air box (16) are arranged along four corners of the rectangle.
3. The ultrasonic acceleration-based surface strengthening device of claim 1, wherein: the pellet conveying device comprises an air compressor (7), a pellet ejector (6), a pellet storage box (4) and a pellet emission channel (8), wherein the output end of the air compressor (7) is connected with the lower part of a pellet acceleration cylinder (10) through the pellet emission channel (8), the pellet emission channel (8) penetrates through the pellet ejector (6), the pellet storage box (4) is connected above the pellet ejector (6), the lower end of the pellet storage box (4) is provided with a pellet discharge hole, and the pellet discharge hole penetrates through the pellet ejector (6) through a pipeline to be connected with and communicated with the pellet emission channel (8).
4. The ultrasonic acceleration-based surface strengthening device of claim 1, wherein: the horizontal distance between the powder injection opening (14) and the powder receiving opening (25) is 180-200 mm, and the vertical distance between the powder particle area and the shot injection outlet is 40-70 mm.
5. The ultrasonic acceleration-based surface strengthening device of claim 1, wherein: the upper surface of the movable working platform (22) is fixedly provided with a clamp (24), the clamp (24) clamps the workpiece, and the movable working platform (22) can drive the workpiece to move left and right, front and back and up and down.
6. The ultrasonic acceleration-based surface strengthening device of claim 1, wherein: the two piston rods (9) with the same structure are symmetrically distributed along the central axis of the amplitude transformer (5), one piston rod (9) stretches into one pellet accelerating cylinder (10), the lower part of the pellet accelerating cylinder (10) is connected with one pellet conveying device, and the two pellet conveying devices are symmetrically distributed along the central axis of the amplitude transformer (5).
7. The ultrasonic acceleration-based surface strengthening device of claim 1, wherein: the powder box (11) is filled with single or mixed C, N, B powder particles.
8. A surface strengthening method based on an ultrasonic acceleration surface strengthening device as set forth in claim 1, characterized by comprising the steps of:
step one: opening a passage between a powder box (11) and a first air box (12), wherein powder falls into the first air box (12);
step two: starting all the bellows, wherein powder is ejected from a powder ejection opening (14) of a first bellows (12) and enters a second bellows (27) through the powder receiving opening (25) towards an opposite powder receiving opening (25), and reaches the first bellows (12) through a circulating route;
step three: simultaneously with the step two, the pellet conveying device and the ultrasonic generator (3) work, pellets enter the pellet accelerating cylinder (10), and under the action of the ultrasonic generator (3), the piston rod (9) slides up and down in the pellet accelerating cylinder (10) to accelerate the pellets to be ejected downwards;
step four: the shot which is ejected downwards passes through the powder particle layer, the powder particles are attached to the lower end of the shot, and the surface of the workpiece is impacted to realize surface strengthening.
9. The surface strengthening method according to claim 8, wherein: in the third step, when the ultrasonic generator 3 reaches the set one-time working time threshold, the shot stops being shot downwards, and then the shot conveying device conveys the shot into the shot accelerating cylinder (10).
10. The surface strengthening method according to claim 8, wherein: and step four, after the surface of the workpiece processing area reaches the set processing times, moving the workpiece to enable the workpiece area to be processed to be right below the powder particles (29) for continuous processing.
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|---|---|---|---|---|
| DE10119288A1 (en) * | 2001-04-20 | 2002-10-24 | Georg Koppenwallner | Process for coating surfaces comprises feeding propellant gas and particles through an acceleration path, and releasing the particles and propellant gas with a specified speed and directing onto the surface to be coated |
| CN103046058A (en) * | 2013-01-25 | 2013-04-17 | 山东大学 | Method for realizing nitriding or carburizing by thermal airflow jetting heating and shot blasting |
| CN112226724A (en) * | 2020-09-11 | 2021-01-15 | 江苏大学 | Normal-temperature nitriding process and processing device based on laser thermal-mechanical effect |
| CN114107887A (en) * | 2021-11-22 | 2022-03-01 | 湖南科技大学 | Ultrasonic-assisted powder metal infiltration device and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015061164A1 (en) * | 2013-10-24 | 2015-04-30 | United Technologies Corporation | Method for enhancing bond strength through in-situ peening |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10119288A1 (en) * | 2001-04-20 | 2002-10-24 | Georg Koppenwallner | Process for coating surfaces comprises feeding propellant gas and particles through an acceleration path, and releasing the particles and propellant gas with a specified speed and directing onto the surface to be coated |
| CN103046058A (en) * | 2013-01-25 | 2013-04-17 | 山东大学 | Method for realizing nitriding or carburizing by thermal airflow jetting heating and shot blasting |
| CN112226724A (en) * | 2020-09-11 | 2021-01-15 | 江苏大学 | Normal-temperature nitriding process and processing device based on laser thermal-mechanical effect |
| CN114107887A (en) * | 2021-11-22 | 2022-03-01 | 湖南科技大学 | Ultrasonic-assisted powder metal infiltration device and method |
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