CN111519009B - Pneumatic shot blasting part surface strengthening device - Google Patents
Pneumatic shot blasting part surface strengthening device Download PDFInfo
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- CN111519009B CN111519009B CN202010393441.8A CN202010393441A CN111519009B CN 111519009 B CN111519009 B CN 111519009B CN 202010393441 A CN202010393441 A CN 202010393441A CN 111519009 B CN111519009 B CN 111519009B
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- fixing rod
- 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
- 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
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- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
A device for strengthening the surface of a part by pneumatic shot blasting comprises a base and a spray gun support, wherein the base is provided with at least one supporting block and at least one connecting rod, and the upper part and the lower part of the connecting rod are respectively fixed with a first fixing rod or a second fixing rod; two first connecting lugs are arranged on one side of the first fixing rod, and a second connecting lug is arranged between the two first connecting lugs; two third connecting lugs are arranged on one side of the second fixing rod; at least one spray gun is fixed on the spray gun support, when more than two spray guns are arranged, shot flows ejected by the spray guns intersect to the same strengthening area, and the distance L between the outlet of each spray gun and the strengthening area is 170-200 mm. In the invention, the shot flows ejected by the spray guns are all concentrated to the same strengthening area, so that the shot peening strengthening area on the surface of the part is controllable and the shot peening coverage rate uniformity is high; can set up many connecting rods on the base, realize many parts simultaneous processing, reduce equipment down time, improve equipment rate of utilization.
Description
Technical Field
The invention belongs to a surface strengthening technology, and particularly relates to a device for strengthening the surface of a part by pneumatic shot blasting.
Background
The fatigue strength of the metal parts can be significantly improved by shot blasting, the shallow indentation produced by shot blasting can be used as an oil bearing, and as a result of hardening, the frictional corrosion is reduced, and the fatigue life of the parts is improved by about 30%. The metal surface shot blasting strengthening process method is widely applied to the field of aerospace products, and is particularly common in the processing of non-shaft structural parts such as upper and lower torsion arms, upper and lower support rods, ejection rods, lock connecting rods and the like in an aircraft landing gear part.
The size of shot blasting parts in the aircraft landing gear structure is mostly within 1200mm multiplied by 500mm multiplied by 200mm, a single part is usually clamped in the traditional pneumatic shot blasting strengthening processing, the shot blasting processing needs to be carried out by being fixed to a large-plane workbench, and a spray gun runs in a straight line. When the method is used, the equipment needs to be stopped for many times, and the shot blasting part of the part needs to be adjusted for many times manually. As the shot blasting parts have complex and various structures, the verification of the shot blasting strength of the parts is extremely complex. In addition, because the spray gun structure of the equipment is fixed in a single-row parallel mode, the processing surface of a part is strengthened by different spray guns for multiple times, the coverage rate of the surface of the part is uneven, and the color difference is serious. The excessive high coverage rate can lead to the surface of the part to generate an over-hardened layer, so that the surface of the part generates defects, the part strengthening effect is opposite, and the part is locally cracked to cause stress corrosion, so that the part fails. Therefore, uniform shot coverage is extremely important for strengthening the surface of the part.
In the traditional numerical control shot blasting method, the position of a simulation piece needs to be adjusted for many times to complete the strength verification of the surface of the part. Because the shot blasting parts have complex structures and the shot blasting numerical control program statements are the most complex statements in the process of machining undercarriage parts, the shot blasting processing period of the parts is long, and the shot blasting parts become bottleneck process parts for enterprise numerical control shot blasting reinforcement processing. Therefore, it is important to improve the shot peening efficiency of the undercarriage component.
Disclosure of Invention
In order to solve the problems of low part shot peening processing efficiency and uneven shot peening coverage rate in the prior art, the invention provides a device for pneumatically shot peening the surface of a part so as to improve the processing efficiency and the processing quality of shot peening of the part.
The technical method adopted by the invention is as follows: a device for strengthening the surface of a part by pneumatic shot blasting comprises a base and a spray gun support, wherein the base is provided with at least one supporting block and at least one connecting rod, and the upper part and the lower part of the connecting rod are respectively fixed with a first fixing rod or a second fixing rod; two first connecting lugs are arranged on one side of the first fixing rod, and a second connecting lug is arranged between the two first connecting lugs; two third connecting lugs are arranged on one side of the second fixing rod; at least one spray gun is fixed on the spray gun support, when more than two spray guns are arranged, the shot flow ejected by the spray guns intersects with the same strengthening area, and the distance L between the outlet of each spray gun and the strengthening area is 170-200 mm.
The parts in the aircraft landing gear are mostly of a structure with lugs and are divided into two types, wherein the first type is a part with one lug at one end and two lugs at the other end, and the second type is a part with two lugs at both ends; when shot peening strengthening is carried out on the surface of a part, a first fixing rod or a second fixing rod can be selected to fix two ends of the part on a connecting rod, the movement of the part along the Z direction is limited by a supporting block, so that the shot peening surface of the part is fully exposed, and then the part is fixed to a specific angle by a spray gun, so that shot flows sprayed by the spray gun are concentrated to the same strengthening area, the shot peening strengthening area on the surface of the part is controllable, the shot peening coverage uniformity is high, and the shot peening time is reduced; meanwhile, as the base can be provided with a plurality of connecting rods, shot blasting processing of a plurality of parts is realized simultaneously, the equipment downtime is reduced, and the equipment utilization rate is improved.
Preferably, a stopper is provided between the second engaging lug and one of the first engaging lugs, so as to limit movement of one end of the member coupled to the second engaging lug in the Y direction.
Preferably, the distance between the two third engaging lugs of the second fixing rod positioned at the upper part of the connecting rod is not equal to the distance between the two third engaging lugs of the second fixing rod positioned at the lower part of the connecting rod, so as to match with the second type of parts with different sizes.
Preferably, first threaded holes are formed in the upper portion and the lower portion of the connecting rod, second threaded holes corresponding to the first threaded holes are formed in the first fixing rod and the second fixing rod, and the first fixing rod and the second fixing rod are fixed to the connecting rod through screws.
Preferably, the other side of the first fixing rod and the other side of the second fixing rod are both provided with grooves wedged with the connecting rod, and the second threaded hole is communicated with the grooves.
Preferably, the end parts of the first connecting lug and the second connecting lug are both provided with third threaded holes, and the third threaded holes are perpendicular to the lug holes of the first connecting lug and the second connecting lug; during the use, the auricle of part one end and the auricle and the second engaging lug of first engaging lug, part other end all are connected through the fixed pin, and the fixed pin is compressed tightly by the screw that sets up in the third screw hole, can restrict the removal of first type part along the X direction through fixed pin and screw.
Preferably, a third threaded hole is formed in the end of the third connecting lug, and the third threaded hole is perpendicular to the ear hole of the third connecting lug; during the use, the auricle and the third engaging lug at part both ends all are connected through the fixed pin, and the fixed pin is compressed tightly by the screw that sets up in the third screw hole, can restrict the removal of second type part along the X direction through fixed pin and screw.
Preferably, the base is in a cross shape, and each side of the base is provided with a connecting rod, so that the simultaneous processing of a plurality of parts is realized.
Preferably, the lug holes of the first connecting lug, the second connecting lug and the third connecting lug are all kidney-shaped holes so as to be connected with the lug pieces of parts with different sizes.
Preferably, the base is provided with a fourth threaded hole, and the base can be fixed to the processing platform through a screw.
The invention has the beneficial effects that:
1. by adopting the device and the method, shot blasting processing of a plurality of parts can be realized simultaneously, the downtime of equipment is reduced, and the utilization rate of the equipment is improved;
2. the device is simple in structure, repeated installation and disassembly of parts are facilitated, the parts can be accurately positioned by the fixing rod, and the parts are prevented from shaking in the shot peening strengthening process;
3. the design of the spray gun bracket can ensure that the shot flows are concentrated to the same strengthening area, so that the strengthening area of the sprayed surface is controllable, the coverage rate of each part surface is high, and the shot blasting time is reduced;
4. the device has small contact area with the part, the utilization rate of the ejected shot flow is high, and shot blasting processing and strength verification of the outer surface of the part can be completed by clamping twice.
Drawings
FIG. 1 is an installation view of the apparatus of the present invention with a first type of component;
FIG. 2 is an enlarged view at D of FIG. 1;
FIG. 3 is an exploded view of the device of FIG. 1;
FIG. 4 is a view of the base and the first fixing rod of the device of the present invention;
FIG. 5 is a connection diagram of a first type of component with a first retaining lever according to a first embodiment of the present invention;
fig. 6 is a connection diagram of the second type of component and the second fixing rod according to the second embodiment of the invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Example one
As shown in figures 1 to 5, the device for pneumatically shot-peening the surface of a part comprises a cross-shaped base 1, wherein each side of the base is fixedly provided with a connecting rod 2, and the end part of each side of the base is also fixedly provided with a plurality of supporting blocks 3. The upper and lower parts of the connecting rod 2 are respectively fixed with a first fixing rod 4A, wherein the upper and lower parts of the connecting rod 2 are both provided with a first threaded hole 5A, the first fixing rod 4A is provided with a second threaded hole 5B corresponding to the first threaded hole 5A, and the first fixing rod 4A is fixed on the connecting rod 2 through a screw. The device also comprises a spray gun 9 for carrying out shot blasting treatment on the part and a spray gun support 10 for placing the spray gun 9, wherein more than one spray gun 9 is arranged on the spray gun support 10, when a plurality of spray guns 9 are arranged, shot flows sprayed by the spray guns 9 are intersected to the same strengthening area, and the distance between the outlet of each spray gun and the strengthening area is 170-200mm, so that the shot blasting strength is optimal and the strengthening area is most remarkable.
First connecting lugs 41 are symmetrically arranged on one side of the first fixing rod 4A, and a second connecting lug 42 is arranged between the two first connecting lugs 41. A stop 44 is arranged between the second connecting lug 42 and one of the first connecting lugs 41. Third screw hole 5C has all been seted up at the tip of first engaging lug 41, second engaging lug 42, and this third screw hole 5C is perpendicular with the earhole of first engaging lug 41, second engaging lug 42, and when the part peening, the auricle and the first engaging lug 41 of part one end, the auricle and the second engaging lug 42 of the part other end all are connected through fixed pin 7, and fixed pin 7 is compressed tightly by the screw 6 that sets up in third screw hole 5C.
In this embodiment, the other side of the first fixing rod 4A is provided with a groove 43 wedged with the connecting rod 2, and the second threaded hole 5B is communicated with the groove 43 and perpendicular to the bottom of the groove 43, so as to prevent the first fixing rod 4A from shaking left and right on the connecting rod 2.
When the first type of component 8A is shot blasted, the first fixing bars 4A are mounted on the connecting rod 2 in a centrosymmetric manner. Placing two lugs at one end of the first type part 8A at the outer side of the first connecting lug 41 of the first fixing rod 4A respectively, placing one lug at the other end of the first type part 8A between the stop block 44 and the second connecting lug 42 of the other first fixing rod 4A, and at the moment, the bottom of the first type part 8A is abutted to the supporting block 3; then, the two ends of the first type part 8A are respectively connected with the first connecting lug 41 and the second connecting lug 42 through the fixing pin 7, and the fixing pin 7 is pressed through the screw 6.
Therefore, the first fixing rod 4A limits the movement of the first type part 8A in the Y direction, the fixing pin 7 limits the movement of the first type part 8A in the X direction, and the supporting block 3 limits the movement of the first type part 8A in the Z direction, so that the stability and reliability of part clamping are ensured.
In this embodiment, a fourth threaded hole 5D is further formed in the base 1, and the base 1 can be fixed to the processing platform 11 through a screw, so that the whole device is fixed.
Example two
A difference from the embodiment is that the second fixing bar 4B is used instead of the first fixing bar in the present embodiment.
In the second embodiment, the second type of part 8B to be machined is structurally characterized by two ends of equal size (both having two lugs)
In this embodiment, a third connecting lug 45 is symmetrically arranged on one side of the second fixing rod 4B. A second threaded hole 5B corresponding to the first threaded hole 5A is formed in the second fixing rod 4B, and the second fixing rod 4B is fixed on the connecting rod 2 through a screw. Third screw hole 5C has all been seted up at the tip of third engaging lug 45, and this third screw hole 5C is perpendicular with the earhole of third engaging lug 45, and when the part peening, the auricle at part both ends all is connected through fixed pin 7 with third engaging lug 45, and fixed pin 7 is compressed tightly by the screw 6 that sets up in third screw hole 5C.
The other side of the second fixing rod 4B is provided with a groove 43 wedged with the connecting rod 2, and the second threaded hole 5B is communicated with the groove 43 and is perpendicular to the bottom of the groove 43, so that the second fixing rod 4B is prevented from shaking left and right on the connecting rod 2.
The sizes of the two second fixing rods 4B at the upper and lower parts of the connecting rod can be set to be different according to the sizes of the two ends of the part.
When the second part 8B is shot-blasted, two lug pieces at two ends of the second part 8B are respectively placed at the outer sides of the third connecting lugs 45 on the corresponding second fixing rods 4B, and the bottom of the second part 8B is abutted against the supporting block 3; then, the two ends of the second type element 8B are connected to the third engaging lug 45 by the fixing pins 7, and the fixing pins 7 are pressed by the screws 6.
Therefore, the second fixing rod 4B limits the movement of the second part 8B in the Y direction, the fixing pin 7 limits the movement of the second part 8B in the X direction, and the supporting block 3 limits the movement of the second part 8B in the Z direction, so that the stability and reliability of part clamping are ensured.
In practice, the method for shot peening using the apparatus of the first or second embodiment includes the steps of:
step one, fixing a base 1 on a processing platform 11;
step two, according to the difference of the processed parts, the first fixing rod 4A or the second fixing rod 4B is installed on a connecting rod of the base; in the step, the distance between first threaded holes 5A at the upper end and the lower end of a connecting rod 2 of a base 1 is determined according to the structural characteristics of the two ends of a first part 8A or a second part 8B, corresponding second threaded holes 5B are formed in a first fixing rod 4A and a second fixing rod 4B, and then the first fixing rod 4A and the second fixing rod 4B are fixed through screws; the height and position of the support block 3 are determined based on the part characteristics.
When the first threaded hole 5A and the second threaded hole 5B are designed, the contact surface between the part shot blasting portion and the device should be minimized to the maximum, and the shot blasting surface exposed to the machining range of the robot gun should be maximized. The base 1 can design many connecting rods 2 according to the part size, realizes many parts clamping simultaneously.
Fixing the part on the first fixing rod 4A or the second fixing rod 4B, and enabling the part to be abutted against the supporting block 3; in the step, when the first-type part 8A appears, only the first fixing rod 4A is needed, and the clamping of the upper part and the lower part of the part can be met. When a second part 8B appears and the sizes of the two ends of the second part 8B are different, two second fixing rods 4B with different sizes need to be designed to fix the upper lug piece and the lower lug piece of the part respectively.
Fixing the spray gun support 10 on the robot, fixing the spray gun 9 on the spray gun support 10, and starting the numerical control equipment to run a numerical control program to perform shot blasting reinforcement on the surface of the part;
in this step, a lance holder is designed to hold a plurality of lances according to the configuration of the lance in the equipment so that the shot streams ejected by the plurality of lances can be concentrated into an effective intensified region. Meanwhile, according to the characteristic of symmetrical clamping of the parts, the outer surface with a plurality of parts clamped at one time is programmed in a sub-module mode, so that the programming operation is simplified, the program track of the outer surface of the parts is accurately controlled, and the shot blasting strength and the coverage rate of the outer surface of the parts are ensured to meet the requirements. In addition, the shot flow is improved to the maximum extent on the premise of meeting the requirements of the drawing and the specification on shot blasting strength. When the outer surface of the part is within a shot blasting strength range, the consistency of three key parameters of shot flow, air pressure and moving speed in the process parameters is ensured to the maximum extent.
And step five, when the surface of one part needs to be changed for machining the other surface after the surface machining is finished, the part is firstly disassembled, and then the third and fourth steps are repeated until all shot blasting processes of the part are finished.
And step six, identifying the parts, determining a processing scheme and a numerical control program, and backing up the part program. And the repeated positioning precision of the clamp is regularly calibrated to ensure that the deformation of the clamp is within the control range.
Claims (10)
1. The device for strengthening the surface of the part through pneumatic shot blasting is characterized by comprising a base (1) and a spray gun support (10), wherein the base (1) is provided with at least one supporting block (3) and at least one connecting rod (2), and a first fixing rod (4A) or a second fixing rod (4B) is fixed on the upper part and the lower part of the connecting rod (2); two first connecting lugs (41) are arranged on one side of the first fixing rod (4A), and a second connecting lug (42) is arranged between the two first connecting lugs (41); two third connecting lugs (45) are arranged on one side of the second fixing rod (4B); at least one spray gun (9) is fixed on the spray gun support (10), when more than two spray guns (9) are arranged, shot flows jetted by the spray guns (9) intersect to the same strengthening area, and the distance L between the outlet of each spray gun (9) and the strengthening area is 170-200 mm.
2. A pneumatic shot-peening device for peening a surface of a part as recited in claim 1, wherein a stop (44) is provided between the second engaging lug (42) and one of the first engaging lugs (41).
3. A pneumatic shot-peening device for peening a surface of a part as set forth in claim 1, wherein a distance between the two third engaging lugs (45) of the second fixing rod (4B) located at the upper portion of the connecting rod (2) is not equal to a distance between the two third engaging lugs (45) of the second fixing rod (4B) located at the lower portion of the connecting rod (2).
4. A pneumatic shot-peening device for peening a surface of a part as recited in claim 1, wherein the upper and lower portions of the link (2) are each formed with a first threaded hole (5A), the first fixing rod (4A) and the second fixing rod (4B) are each formed with a second threaded hole (5B) corresponding to the first threaded hole (5A), and the first fixing rod (4A) and the second fixing rod (4B) are each fixed to the link (2) by screws.
5. A pneumatic shot-peening apparatus for peening a surface of a part as defined in claim 4, wherein the other side of the first fixing rod (4A) and the other side of the second fixing rod (4B) are formed with grooves (43) which are engaged with the link (2), and the second screw hole (5B) communicates with the grooves (43).
6. A pneumatic shot-peening device for peening a surface of a part as recited in claim 1, wherein the ends of the first engaging lug (41) and the second engaging lug (42) are each formed with a third threaded hole (5C), and the third threaded holes (5C) are perpendicular to the lug holes of the first engaging lug (41) and the second engaging lug (42); during the use, the auricle and first engaging lug (41), the auricle and the second engaging lug (42) of the part other end of part one end all are connected through fixed pin (7), and fixed pin (7) are compressed tightly by screw (6) that set up in third screw hole (5C).
7. A pneumatic shot-peening device for peening a surface of a part as recited in claim 1, wherein the end of the third engaging lug (45) is formed with a third screw hole (5C), and the third screw hole (5C) is perpendicular to the lug hole of the third engaging lug (45); during the use, the auricle and third engaging lug (45) at part both ends all are connected through fixed pin (7), and fixed pin (7) are compressed tightly by screw (6) of setting in third screw hole (5C).
8. A pneumatic shot-peening device for peening a surface of a part as claimed in claim 1, wherein the base (1) is "cross-shaped" and a connecting rod (2) is provided on each side of the base (1).
9. A pneumatic shot-peening apparatus for peening a surface of a part as recited in claim 1, wherein the lug holes of the first engaging lug (41), the second engaging lug (42), and the third engaging lug (45) are all kidney-shaped holes.
10. A pneumatic shot-peening device for peening a surface of a part as recited in claim 1, wherein the base (1) is formed with a fourth threaded hole (5D).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010393441.8A CN111519009B (en) | 2020-05-11 | 2020-05-11 | Pneumatic shot blasting part surface strengthening device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010393441.8A CN111519009B (en) | 2020-05-11 | 2020-05-11 | Pneumatic shot blasting part surface strengthening device |
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| CN111519009A CN111519009A (en) | 2020-08-11 |
| CN111519009B true CN111519009B (en) | 2021-12-03 |
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| CN111519009A (en) | 2020-08-11 |
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