CN114085968B - Method for reinforcing cold extrusion assembly holes of slotted bushing and matched tooling device - Google Patents
Method for reinforcing cold extrusion assembly holes of slotted bushing and matched tooling device Download PDFInfo
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- CN114085968B CN114085968B CN202111373564.6A CN202111373564A CN114085968B CN 114085968 B CN114085968 B CN 114085968B CN 202111373564 A CN202111373564 A CN 202111373564A CN 114085968 B CN114085968 B CN 114085968B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/001—Article feeders for assembling machines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/02—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same
- B23P19/027—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same using hydraulic or pneumatic means
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a method for reinforcing a cold extrusion assembly hole of a slotted bushing and a matched tooling device, wherein the method comprises the following steps: steps S1-S5. The matched tool comprises an extrusion gun, an extrusion core rod and a lining top block; a piston cavity is arranged in the outer shell, a telescopic movable mechanism is arranged in the piston cavity, the front end of the outer shell is provided with an extension end, a telescopic channel communicated with the piston cavity is arranged in the extension end, a telescopic rod is arranged in the telescopic channel, and one end of the telescopic rod is connected with the telescopic movable mechanism; the end part of the extrusion core rod is provided with a first annular extrusion part, and a transition section for placing the slotted bushing is arranged between the first extrusion part and the second extrusion part; the bushing top block is of a conical tubular structure with a large upper part and a small lower part, and is sleeved on the extrusion core rod. The invention provides a method for carrying out secondary extrusion strengthening on the assembly hole by utilizing the slotted bushing, so that the uniformity of the stress value of the whole assembly hole is realized, the strengthening quality and effect are better ensured, and the fatigue resistance is further obviously improved.
Description
Technical Field
The invention relates to the technical field of surface treatment of assembly holes, in particular to a slotted bushing cold extrusion assembly hole strengthening method and a matched tooling device.
Background
The cold extrusion of the slotted bushing is a connecting hole strengthening technology, can effectively improve the fatigue life of the connecting hole, and has the advantages of no increase in quality, no change in structure, good strengthening effect and the like. With the continuous development of modern manufacturing industry, higher requirements are placed on the performance of materials, and both light weight and durability are always the targets pursued in the field of aviation manufacturing. The largest proportion in the aircraft structure is the connecting hole structure, and the hole structure is a key factor for causing stress concentration. The slotted liner hole extrusion strengthening technology is a surface strengthening technology which is widely applied in the foreign aviation industry at present, is mainly applied to the hole structure of aviation key bearing metal components, and can effectively improve the fatigue resistance life of the holes. The slotted bushing has better reinforcement effect and wider application.
At present, the traditional extrusion method for reinforcing the connecting hole by adopting the cold extrusion of the slotted bushing is adopted, because the cold-drawing core rod radially acts on the whole hole process through the slotted bushing, the extrusion flows on the inner wall of the hole are different, the stress states of the entering end and the extrusion end of the hole are often greatly different, the stress value of the entering end is smaller than that of the extrusion end, even the difference is great, the stress value difference on the inner wall of the whole hole is increased, the inside of the whole hole is uneven, the entering end is easy to have larger cracking tendency, and a weak link forms a crack to cause damage.
The cold extrusion residual stress of the slotted bushing is asymmetrically distributed along the thickness direction, the residual compressive stress of the extrusion surface is minimum, the tangential residual stress of the extrusion surface is maximum, and the overall difference is large, as shown in fig. 4. This is because the axial flow of the cell wall material during extrusion causes the extrusion face to take part in plastic deformation with more metal and higher residual compressive stress in the circumferential direction; fatigue specimen fracture morphology was observed for the failed part and the source of strengthening hole fatigue cracks was found to occur generally at the extrusion inlet.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a cold extrusion assembly hole reinforcing method for a slotted bushing for secondarily extruding an assembly hole and a matched tool device.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
the method for reinforcing the cold extrusion assembly holes of the slotted bushing comprises the following steps:
s1: loading the slotted bushing on an extrusion core rod of the extrusion tooling device, so that the slotted bushing is sleeved on a transition section of the extrusion core rod, and the end part of a bushing top block is contacted with the slotted bushing;
s2: the slotted bushing is inserted into the assembly hole, so that the bushing ejector block is propped against the slotted bushing, the extrusion gun drives the extrusion core rod to move, and the assembly hole is extruded in two opposite directions through the slotted bushing;
s3: assembling after the first extrusion is completedPlastic deformation delta of hole 1 ＝r 1 -r，r 1 The radius of the assembly hole measured after the first extrusion is finished, and r is the radius of the assembly hole when the first extrusion is not finished;
s4: plastic deformation delta of assembly hole after secondary extrusion 2 ＝r 2 -r 1 ，r 2 Radius of the assembly hole measured after the second extrusion is completed; and satisfy delta 1 ≤Δ 2 ，Δ 1 +Δ 2 =Δ, Δ is the total plastic deformation of the extrusion as required by the design;
s5: and (3) reaming the assembly hole, removing the extrusion convex shoulder and the counter yielding layer on the inner surface of the assembly hole, and checking the aperture.
Further, step S2 includes:
a21: inserting the slotted bushing into the assembly hole, driving the extrusion core rod to extend by the extrusion tooling device, extending a second extrusion part on the extrusion core rod to extrude the slotted bushing, and realizing first extrusion after the second extrusion part reaches a stroke;
a22: after the first extrusion is finished, the extrusion tooling device drives the extrusion core rod to shrink backwards, and the first extrusion part reversely extrudes the slotted liner in the shrinkage process until the first extrusion part completely extracts the slotted liner, so that the second extrusion is realized.
Further, step S2 includes:
b21: inserting the slotted bushing into the assembly hole from one end of the assembly hole, driving the extrusion core rod to shrink by the extrusion tooling device, and shrinking the first extrusion part on the extrusion core rod backwards to extrude the slotted bushing, wherein the first extrusion part is completely pulled out of the slotted bushing, so that the first extrusion is completed;
b22: taking out the slotted bushing from the assembly hole, and replacing a new slotted bushing to be assembled on the extrusion core rod;
b23: inserting a new slotted bushing into the assembly hole from the other end of the assembly hole, and aligning the slotted position of the new slotted bushing with the slotted position of the slotted bushing used for the first extrusion;
b24: the extrusion tooling device drives the extrusion core rod to shrink, the first extrusion part on the extrusion core rod shrinks backwards to extrude the slotted liner, and the second extrusion is completed after the slotted liner is completely extracted by the first extrusion part.
The cold extrusion tooling device comprises an extrusion gun, an extrusion core rod and a bushing top block; the extrusion gun comprises an outer shell, wherein a handle is arranged on the outer shell, a piston cavity is arranged in the outer shell, a telescopic moving mechanism is arranged in the piston cavity, the front end of the outer shell is provided with an extension end, a telescopic channel communicated with the piston cavity is arranged in the extension end, a telescopic rod is arranged in the telescopic channel, and one end of the telescopic rod is connected with the telescopic moving mechanism;
the end part of the extrusion core rod is provided with an annular first extrusion part, the tail part of the extrusion core rod is provided with a baffle ring, the baffle ring is detachably connected with the end part of the telescopic rod, a second extrusion part is arranged between the first extrusion part and the baffle ring, a transition section for placing a slotting bush is arranged between the first extrusion part and the second extrusion part, the diameter of the first extrusion part is larger than that of the second extrusion part, the diameter of the second extrusion part is larger than that of the transition section, and the diameter of the transition section is the same as that of the extrusion core rod;
the bush kicking block is big-end-up's toper tubular structure, and a plurality of fluting along the axial are seted up to the tip of bush kicking block, and a plurality of fluting are evenly distributed on the circumference, and the bush kicking block cover is on the extrusion plug, and the internal diameter of the lower extreme binding off department of bush kicking block is greater than the diameter of first extrusion portion, and the afterbody and the extension end detachable of bush kicking block are connected.
Further, the telescopic movable mechanism comprises a piston arranged in the piston cavity, the piston is connected with a telescopic rod, the telescopic rod penetrates through a sealing end fixedly arranged in the telescopic channel, the sealing end is movably connected with the telescopic rod, and a plurality of sealing rings are arranged on the inner diameter of the sealing end; the two ends of the piston cavity are respectively connected with the first hydraulic channel and the second hydraulic channel, the piston is arranged between the first hydraulic channel and the second hydraulic channel, the first hydraulic channel and the second hydraulic channel are both connected with the reversing valve, the reversing valve is respectively connected with the first interface and the second interface at the lower end of the grip through pipelines, and the first interface and the second interface are connected with the gas-liquid booster pump through pipelines.
Further, a reverse rivet pulling button and a forward rivet pulling button for controlling the reversing valve are arranged on the handle, the reverse rivet pulling button and the forward rivet pulling button are respectively connected with the gas-liquid booster pump and the reversing valve through pneumatic pipelines, and one-way valves are arranged between the reverse rivet pulling button and the gas-liquid booster pump and between the forward rivet pulling button and the gas-liquid booster pump.
Further, the end part of the telescopic rod is provided with a jack, the baffle ring is provided with a stud, and the stud is in threaded connection with the jack.
Further, the tip of extension end is provided with first connecting portion, is provided with the external screw thread on the first connecting portion, and the connecting hole has been seted up to the afterbody of bush kicking block, and connecting hole and first connecting portion threaded connection.
Further, the tail of the outer shell is provided with a rear cover for sealing the piston cavity, and the rear cover is in threaded connection with a second connecting part arranged on the outer shell.
The beneficial effects of the invention are as follows: the device of the cold extrusion tooling device for the slotted bushing cold extrusion assembly hole reinforcing method can stably assemble the slotted bushing, further realize secondary extrusion of the assembly hole through the slotted bushing, enable the extrusion gun to automatically stretch and retract through the hydraulic drive extrusion core rod, facilitate the assembly process of the tooling, effectively ensure stability in the extrusion process of the extrusion core rod, and enable the extrusion process to be uniformly stressed.
The invention provides a method for carrying out secondary extrusion strengthening on the assembly hole by utilizing the slotted bushing, so that the uniformity of the stress value of the whole assembly hole is realized, the strengthening quality and effect are better ensured, and the fatigue resistance is further obviously improved. Through slotting bush under twice extrusion, tangential residual stress along thickness direction's distribution is even, at twice cold extrusion's in-process, along with the removal of extrusion plug, the plastic flow takes place earlier for material around the pilot hole for material stacks from the upper surface to the lower surface gradually, and when extruding for the second time, makes the material of piling up to the reverse movement, and the material of piling up gets back to initial position, effectually avoids stress distribution inhomogeneous. Meanwhile, the extrusion process is simple, manufacturing tools are saved, the manufacturing period is shortened, and the manufacturing cost is reduced.
Drawings
Fig. 1 is a structural view of the extrusion gun.
Fig. 2 is a structural view of the bushing block and the extrusion mandrel.
Fig. 3 is a schematic diagram of the hydraulic control of the extrusion chamber.
FIG. 4 is a graph showing the distribution of residual stress around a cold extrusion assembly hole of a split bushing according to the prior art.
Fig. 5 is a schematic diagram showing the distribution of the tangential residual stress of the wall of the cold extrusion assembly hole of the split bush along the axial direction of the hole.
Wherein, 1, a rear cover, 2, a second connecting part, 3, an outer shell, 4, a piston cavity, 5, a piston, 6, a telescopic rod, 7, a sealing end, 8, an extension end, 9, a telescopic channel, 10, an inserting hole, 11, a first connecting part, 12, a first hydraulic channel, 13, a second hydraulic channel, 14, a positive rivet button, 15 and a reversing valve, 16, a first interface, 17, a second interface, 18, an extrusion core rod, 19, a second extrusion part, 20, a slotted bushing, 21, a transition section, 22, a connecting hole, 23, a bushing top block, 24, a reverse rivet button, 25, an air pressure pipeline, 26, a reversing valve, 27, an air-liquid booster pump, 28, a one-way valve, 29 and a first extrusion part.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
The cold extrusion assembly hole reinforcing method of the slotted bushing comprises the following steps:
s1: loading the slotted bushing 20 on an extrusion core rod of the extrusion tooling device, so that the slotted bushing is sleeved on the transition section of the extrusion core rod, and the end part of the bushing top block is contacted with the slotted bushing;
s2: the slotted bushing is inserted into the assembly hole, so that the bushing ejector block is propped against the slotted bushing, the extrusion gun drives the extrusion core rod to move, and the assembly hole is extruded in two opposite directions through the slotted bushing;
s3: plastic deformation delta of assembly hole after first extrusion 1 ＝r 1 -r，r 1 The radius of the assembly hole measured after the first extrusion is finished, and r is the radius of the assembly hole when the first extrusion is not finished;
s4: plastic deformation delta of assembly hole after secondary extrusion 2 ＝r 2 -r 1 ，r 2 Radius of the assembly hole measured after the second extrusion is completed; and satisfy delta 1 ≤Δ 2 ，Δ 1 +Δ 2 =Δ, Δ is the total amount of plastic deformation of the extrusion as required by the design.
S5: and (3) reaming the assembly hole, removing the extrusion convex shoulder and the reverse yielding layer on the inner surface of the assembly hole, and checking the aperture.
When the scheme is implemented, the step S2 can be implemented by adopting a method that a slotted bushing is subjected to cold extrusion back and forth for two times:
a21: inserting the slotted bushing into the assembly hole, driving the extrusion core rod to extend by the extrusion tooling device, extending a second extrusion part on the extrusion core rod to extrude the slotted bushing, and realizing first extrusion after the second extrusion part reaches a stroke;
a22: after the first extrusion is completed, the extrusion tooling device drives the extrusion core rod to shrink backwards, and the first extrusion part 29 reversely extrudes the slotted liner in the shrinkage process until the first extrusion part 29 completely withdraws the slotted liner, so that the second extrusion is realized.
When the scheme is implemented, the following method can be adopted in the step S2, and two identical slotted bushings are adopted to realize twice cold extrusion at two ends of the assembly hole respectively:
b21: inserting the slotted bushing into the assembly hole from one end of the assembly hole, driving the extrusion core rod to shrink by the extrusion tooling device, and shrinking the first extrusion part 29 on the extrusion core rod backwards to extrude the slotted bushing, wherein the first extrusion part 29 completely extracts the slotted bushing, and then finishing the first extrusion;
b22: taking out the slotted bushing from the assembly hole, and replacing a new slotted bushing to be assembled on the extrusion core rod;
b23: inserting a new slotted bushing into the assembly hole from the other end of the assembly hole, and aligning the slotted position of the new slotted bushing with the slotted position of the slotted bushing used for the first extrusion;
b24: the extrusion tooling device drives the extrusion core rod to shrink, the first extrusion part 29 on the extrusion core rod shrinks backwards to extrude the slotted liner, and the second extrusion is completed after the first extrusion part 29 completely extracts out of the slotted liner.
As shown in fig. 1, 2 and 3, the cold extrusion tooling device of the split bush 20, which is used in cooperation with the method for reinforcing the cold extrusion assembly hole of the split bush in the scheme, comprises an extrusion gun, an extrusion core rod 18 and a bush top block 23; the extrusion gun comprises an outer shell 3, a handle is arranged on the outer shell 3, a piston cavity 4 is arranged in the outer shell 3, a telescopic moving mechanism is arranged in the piston cavity 4, an extension end 8 is arranged at the front end of the outer shell 3, a telescopic channel 9 communicated with the piston cavity 4 is arranged in the extension end 8, a telescopic rod 6 is arranged in the telescopic channel 9, and one end of the telescopic rod 6 is connected with the telescopic moving mechanism;
the end of the extrusion core rod 18 is provided with an annular first extrusion part 29, the tail of the extrusion core rod 18 is provided with a baffle ring, the baffle ring is detachably connected with the end of the telescopic rod 6, a second extrusion part 19 is arranged between the first extrusion part 29 and the baffle ring, a transition section 21 for placing the slotted liner 20 is arranged between the first extrusion part 29 and the second extrusion part 19, the diameter of the first extrusion part 29 is larger than that of the second extrusion part 19, the diameter of the second extrusion part 19 is larger than that of the transition section 21, and the diameter of the transition section 21 is the same as that of the extrusion core rod 18. The extrusion parts with different diameters at the two ends realize two opposite extrusion.
The bushing top block 23 is of a conical tubular structure with a large upper part and a small lower part, a plurality of grooves along the axial direction are formed in the end part of the bushing top block 23, the grooves are uniformly distributed on the circumference, the bushing top block 23 is sleeved on the extrusion core rod 18, the inner diameter of the closing-in part at the lower end of the bushing top block 23 is larger than the diameter of the first extrusion part 29, and the tail part of the bushing top block 23 is detachably connected with the extension end 8. The bush top block 23 is assembled at the front end of the extrusion gun for supporting the split bush 20 when reinforcing the assembly hole by the split bush 20.
The telescopic movable mechanism comprises a piston 5 arranged in a piston cavity 4, the piston 5 is connected with a telescopic rod 6, the telescopic rod 6 penetrates through a sealing end 7 fixedly arranged in a telescopic channel 9, the sealing end 7 is movably connected with the telescopic rod 6, and a plurality of sealing rings are arranged on the inner diameter of the sealing end 7; the two ends of the piston cavity 4 are respectively connected with a first hydraulic channel 12 and a second hydraulic channel 13, the piston 5 is arranged between the first hydraulic channel 12 and the second hydraulic channel 13, the first hydraulic channel 12 and the second hydraulic channel 13 are both connected with a reversing valve 15, the reversing valve 15 is respectively connected with a first interface 16 and a second interface 17 at the lower end of the grip through pipelines, and the first interface 16 and the second interface 17 are connected with a gas-liquid booster pump through pipelines.
The handle is provided with a reverse rivet button 24 and a forward rivet button 14 for controlling a reversing valve 26, the reverse rivet button 24 and the forward rivet button 14 are respectively connected with a gas-liquid booster pump 27 and the reversing valve 26 through a pneumatic pipeline 25, and a one-way valve 28 is arranged between the reverse rivet button 24 and the gas-liquid booster pump 27 and between the forward rivet button 14 and the gas-liquid booster pump 27.
The passage of the reversing valve 15 is controlled by pressing the reverse riveting button 24 and the forward riveting button 14, so that the passages of hydraulic liquid inlet and liquid outlet are controlled, the extension and shortening of the telescopic rod 6 are controlled, and continuous twice forward and reverse extrusion is realized. The end of the telescopic rod 6 is provided with a jack 10, the baffle ring is provided with a stud, and the stud is in threaded connection with the jack 10, so that the installation is convenient.
The end of the extension end 8 is provided with a first connecting part 11, the first connecting part 11 is provided with external threads, the tail part of the bushing top block 23 is provided with a connecting hole 22, and the connecting hole 22 is in threaded connection with the first connecting part 11. The tail of the outer shell body 3 is provided with a rear cover 1 for sealing the piston cavity 4, and the rear cover 1 is in threaded connection with a second connecting part 2 arranged on the outer shell body 3.
The device of the cold extrusion tooling device for the slotted bushing 20 can stably assemble the slotted bushing 20, further realize secondary extrusion of the assembly holes through the slotted bushing 20, automatically stretch and retract the extrusion gun through the hydraulic drive extrusion core rod 18, is convenient in assembly process of the tooling, can effectively ensure stability in the extrusion process of the extrusion core rod 18, and ensures uniform stress in the extrusion process.
The invention provides a method for carrying out secondary extrusion strengthening on the assembly hole by utilizing the slotted bushing 20, so that the uniformity of the stress value of the whole assembly hole is realized, and as shown in fig. 5, the cold extrusion method of the invention can be obviously seen by comparison, the strengthening quality and effect are better ensured, and the fatigue resistance performance is further obviously improved. Through slotting bush 20 under twice extrusion, tangential residual stress along thickness direction's distribution is even, and at twice cold extrusion's in-process, along with the removal of extrusion plug 18, the plastic flow takes place for the material around the pilot hole earlier for the material stacks from the upper surface to the lower surface gradually, and during the secondary extrusion, makes the material of piling up to the reverse removal, and the material of piling up returns to initial position, effectually avoids the inhomogeneous problem of stress distribution. Meanwhile, the extrusion process is simple, the consistency of the two cold extrusion processes can be effectively ensured by adopting the matched tool, the process quality is ensured, the manufacturing tool is saved, the manufacturing period is shortened, and the manufacturing cost is reduced.
Claims (6)
1. A method for reinforcing a cold extrusion assembly hole of a slotted bushing is characterized by comprising the following steps:
s1: loading the slotted bushing on an extrusion core rod of the extrusion tooling device, so that the slotted bushing is sleeved on a transition section of the extrusion core rod, and the end part of a bushing top block is contacted with the slotted bushing;
s2: the slotted bushing is inserted into the assembly hole, so that the bushing ejector block is propped against the slotted bushing, the extrusion gun drives the extrusion core rod to move, and the assembly hole is extruded in two opposite directions through the slotted bushing;
the step S2 includes:
a21: inserting the slotted bushing into the assembly hole, driving the extrusion core rod to extend by the extrusion tooling device, extending a second extrusion part on the extrusion core rod to extrude the slotted bushing, and realizing first extrusion after the second extrusion part reaches a stroke;
a22: after the first extrusion is finished, the extrusion tooling device drives the extrusion core rod to shrink backwards, and the first extrusion part reversely extrudes the slotted bushing in the shrinking process until the first extrusion part completely extracts the slotted bushing, so that the second extrusion is realized;
s3: plastic deformation delta of assembly hole after first extrusion 1 =r 1 -r，r 1 The radius of the assembly hole measured after the first extrusion is finished, and r is the radius of the assembly hole when the first extrusion is not finished;
s4: plastic deformation delta of assembly hole after secondary extrusion 2 =r 2 -r 1 ，r 2 Radius of the assembly hole measured after the second extrusion is completed; and satisfy delta 1 ≤Δ 2 ，Δ 1 +Δ 2 =Δ, Δ is the total plastic deformation of the extrusion as required by the design;
s5: and (3) reaming the assembly hole, removing the extrusion convex shoulder and the counter yielding layer on the inner surface of the assembly hole, and checking the aperture.
2. A cold extrusion tooling device applied to the method for reinforcing the cold extrusion assembly holes of the slotted bushing of claim 1, which is characterized by comprising an extrusion gun, an extrusion core rod and a bushing top block; the extrusion gun comprises an outer shell, a handle is arranged on the outer shell, a piston cavity is arranged in the outer shell, and the piston cavity
The telescopic movable mechanism is arranged in the telescopic movable mechanism, the front end of the outer shell is provided with an extension end, a telescopic channel communicated with the piston cavity is arranged in the extension end, a telescopic rod is arranged in the telescopic channel, and one end of the telescopic rod is connected with the telescopic movable mechanism;
the end part of the extrusion core rod is provided with an annular first extrusion part, the tail part of the extrusion core rod is provided with a baffle ring, the baffle ring is detachably connected with the end part of the telescopic rod, a second extrusion part is arranged between the first extrusion part and the baffle ring, a transition section for placing a slotting bush is arranged between the first extrusion part and the second extrusion part, the diameter of the first extrusion part is larger than that of the second extrusion part, the diameter of the second extrusion part is larger than that of the transition section, and the diameter of the transition section is the same as that of the extrusion core rod;
the bushing top block is of a conical tubular structure with a large upper part and a small lower part, a plurality of axial grooves are formed in the end part of the bushing top block, the grooves are uniformly distributed on the circumference, the bushing top block is sleeved on the extrusion core rod, the inner diameter of the closing-in position at the lower end of the bushing top block is larger than the diameter of the first extrusion part, and the tail part of the bushing top block is detachably connected with the extension end;
the telescopic movable mechanism comprises a piston arranged in a piston cavity, the piston is connected with a telescopic rod, the telescopic rod penetrates through a sealing end fixedly arranged in a telescopic channel, the sealing end is movably connected with the telescopic rod, and a plurality of sealing rings are arranged on the inner diameter of the sealing end; the two ends of the piston cavity are respectively connected with the first hydraulic channel and the second hydraulic channel, the piston is arranged between the first hydraulic channel and the second hydraulic channel, the first hydraulic channel and the second hydraulic channel are both connected with the reversing valve, the reversing valve is respectively connected with the first interface and the second interface at the lower end of the grip through pipelines, and the first interface and the second interface are connected with the gas-liquid booster pump through pipelines.
3. The cold extrusion tooling device for the reinforcement method of the cold extrusion assembly holes of the slotted bushing according to claim 2, wherein the handle is provided with a reverse rivet button and a forward rivet button for controlling the reversing valve, and the reverse rivet button and the forward rivet button are respectively connected with the gas-liquid booster pump and the reversing valve through a pneumatic pipeline
And check valves are arranged between the reverse rivet button and the gas-liquid booster pump and between the forward rivet button and the gas-liquid booster pump.
4. The cold extrusion tooling device for the reinforcement method of the cold extrusion assembly holes of the slotted bushings of claim 2, wherein the end part of the telescopic rod is provided with a jack, the baffle ring is provided with a stud, and the stud is in threaded connection with the jack.
5. The cold extrusion tooling device for the reinforcement method of the cold extrusion assembly holes of the slotted bushings according to claim 2, wherein the end part of the extension end is provided with a first connecting part, the first connecting part is provided with external threads, the tail part of the bushing top block is provided with a connecting hole, and the connecting hole is in threaded connection with the first connecting part.
6. The cold extrusion tooling device for the reinforcement method of the cold extrusion assembly holes of the slotted bushing of claim 2, wherein a rear cover for sealing the piston cavity is arranged at the tail of the outer shell, and the rear cover is in threaded connection with a second connecting part arranged on the outer shell.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111373564.6A CN114085968B (en) | 2021-11-19 | 2021-11-19 | Method for reinforcing cold extrusion assembly holes of slotted bushing and matched tooling device |
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|---|---|---|---|
| CN202111373564.6A CN114085968B (en) | 2021-11-19 | 2021-11-19 | Method for reinforcing cold extrusion assembly holes of slotted bushing and matched tooling device |
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| Publication Number | Publication Date |
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| CN114085968A CN114085968A (en) | 2022-02-25 |
| CN114085968B true CN114085968B (en) | 2023-08-11 |
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| CN105666036A (en) * | 2014-11-17 | 2016-06-15 | 昌河飞机工业（集团）有限责任公司 | Assembly method capable of achieving hole and bush extrusion strengthening twice |
| CN209923388U (en) * | 2019-01-23 | 2020-01-10 | 南京航空航天大学 | Single Excitation Ultrasonic Vibration Longitudinal Bending Compound Hole Wall Extrusion Strengthening Device |
| CN111118270A (en) * | 2019-12-31 | 2020-05-08 | 西北工业大学 | Cold extruding process and device for homogenizing residual stress around hole |
| CN112662965A (en) * | 2020-12-09 | 2021-04-16 | 南京航空航天大学 | Process for reinforcing assembly hole by adopting slotted bushing cold extrusion |
| CN113399486A (en) * | 2021-06-17 | 2021-09-17 | 西北工业大学 | Multi-section cold extrusion strengthening device and use method thereof |
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| FR2975030B1 (en) * | 2011-05-10 | 2014-06-13 | Aubert & Duval Sa | HOT SPINNING METHOD FOR MAKING A METAL PIECE, WIRING TOOL FOR ITS USE AND ROD OF LANDING TRAIN SO REALIZED |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105666036A (en) * | 2014-11-17 | 2016-06-15 | 昌河飞机工业（集团）有限责任公司 | Assembly method capable of achieving hole and bush extrusion strengthening twice |
| CN209923388U (en) * | 2019-01-23 | 2020-01-10 | 南京航空航天大学 | Single Excitation Ultrasonic Vibration Longitudinal Bending Compound Hole Wall Extrusion Strengthening Device |
| CN111118270A (en) * | 2019-12-31 | 2020-05-08 | 西北工业大学 | Cold extruding process and device for homogenizing residual stress around hole |
| CN112662965A (en) * | 2020-12-09 | 2021-04-16 | 南京航空航天大学 | Process for reinforcing assembly hole by adopting slotted bushing cold extrusion |
| CN113399486A (en) * | 2021-06-17 | 2021-09-17 | 西北工业大学 | Multi-section cold extrusion strengthening device and use method thereof |
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