CN118180213A - Rivet lock ring bending forming die and method for aerospace - Google Patents
Rivet lock ring bending forming die and method for aerospace Download PDFInfo
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- CN118180213A CN118180213A CN202410611951.6A CN202410611951A CN118180213A CN 118180213 A CN118180213 A CN 118180213A CN 202410611951 A CN202410611951 A CN 202410611951A CN 118180213 A CN118180213 A CN 118180213A
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- 238000005452 bending Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005096 rolling process Methods 0.000 claims abstract description 180
- 230000007246 mechanism Effects 0.000 claims abstract description 52
- 230000000670 limiting effect Effects 0.000 claims abstract description 28
- 230000009471 action Effects 0.000 claims description 16
- 238000012545 processing Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 16
- 238000000465 moulding Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 7
- 238000007493 shaping process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
- B21D5/08—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers
- B21D5/086—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers for obtaining closed hollow profiles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/16—Making other particular articles rings, e.g. barrel hoops
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- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention relates to a rivet lock ring bending forming die and method for aerospace, and belongs to the technical field of rivets. The forming die comprises an upper die mechanism and a lower die mechanism, the upper die mechanism comprises an upper die seat and an upper rolling die, a blanking part and an upper forming groove are arranged on the upper rolling die, and the feeding end face of the blanking part is a chamfer; the lower die mechanism comprises a lower die holder, a lower rolling die, a feeding die, a fixed-length die, a shaft die holder and a mandrel, wherein the shaft die holder is connected with the lower die holder through at least one elastic limiting mechanism, the mandrel is positioned between the upper rolling die and the lower rolling die, a locking ring blank enters between the upper rolling die and the mandrel, the free end of the locking ring blank is abutted against the fixed-length die, a lower forming groove is formed in the lower rolling die, and an annular cavity for locking ring forming is formed among the upper rolling die, the mandrel and the lower rolling die during die assembly. The forming method comprises feeding and blanking of the round hole. The invention has simple structure, convenient processing and high forming efficiency, and importantly, the size consistency of the locking ring is improved, thereby ensuring the consistency of the locking performance of the riveted rivet.
Description
Technical Field
The invention relates to a rivet lock ring bending forming die and method for aerospace, and belongs to the technical field of rivets.
Background
Rivets are one of the most demanded fasteners in the aerospace field, and are mainly used for connecting aircraft skin panels, and the consumption of the rivets can exceed millions of fasteners. Along with the development of the national aerospace field, the requirements on the model weight reduction, wind resistance reduction and looseness prevention of the related field are higher and higher, and the contribution of rivet products to the flight process, which is realized by the rivet products, becomes more remarkable.
The self-locking rivet is used as a single-sided connection product structure and is complex, in order to ensure that the product has stronger vibration resistance and anti-loose capability, higher requirements are provided for the self-locking performance of the rivet, so that the self-locking function of the rivet product is improved by arranging a locking structure on the rivet product, the existing common locking structure adopts the design of material increase, the locking structure is higher than the surface of a skin, the material increase of the locking structure is against the requirements of reducing the dead weight and wind resistance of the rivet, and the requirements of light weight and anti-loose of the rivet cannot be met.
In order to meet the requirements of rivet light weight and looseness prevention, the prior art also designs a locking structure of a locking ring, and a groove is formed in a mandrel of the rivet, so that the influence of weight increase caused by material increase is avoided, the rivet with the locking ring is high in riveting strength, self-locking performance is improved, and meanwhile the requirement of rivet light weight can be met, and the rivet is widely applied.
The locking ring is of an inclined opening structure, the size is smaller, the general outer diameter is about 4mm, the existing annular structure with the opening is processed in a ring winding mode, the consistency of the size of the ring winding mode is poor, the problem that the consistency of the roundness, the opening size and the like of the ring exist is poor, and the matching consistency of the rivet sleeve, the core rod and the locking ring of the rivet is reduced due to the influence of the locking ring processing technology in the using process, so that the locking performance of the rivet is reduced, and the self-locking performance of the rivet cannot be improved.
Disclosure of Invention
The invention provides a rivet lock ring bending forming die and method for aerospace, aiming at the defects in the prior art.
The technical scheme for solving the technical problems is as follows: the rivet lock ring bending forming die for aerospace comprises an upper die mechanism and a lower die mechanism, wherein the upper die mechanism comprises an upper die seat and an upper rolling die arranged on the upper die seat, a blanking part for cutting off lock ring blanks and an upper forming groove for lock ring forming are arranged at the action end of the upper rolling die, and the feeding end face of the blanking part is a chamfer;
The lower die mechanism comprises a lower die holder, a lower rolling die, a feeding die, a fixed-length die, an axle die holder and a mandrel, wherein the lower rolling die is arranged on the lower die holder, the mandrel is arranged on the axle die holder, the slideway is arranged on the lower die holder and used for enabling the axle die holder to move up and down, the axle die holder is connected with the lower die holder through at least one elastic limiting mechanism, the feeding die and the fixed-length die are arranged on the left side and the right side of the upper rolling die and the lower rolling die, a feeding hole for enabling a locking ring blank to pass through is formed on the feeding die or between the feeding die and the axle die holder, the mandrel is arranged between the upper rolling die and the lower rolling die, the locking ring blank enters into a lower forming groove for locking ring forming is formed on the acting end of the lower rolling die, and an annular cavity for locking ring forming is formed among the upper rolling die, the mandrel and the lower rolling die during die.
The beneficial effects of the invention are as follows: the feeding hole is convenient for the strip feeding of catch blank on the one hand, on the other hand can straighten and position the catch blank, utilize forming die to control the feeding length and cut off the bevel, can satisfy the requirement of catch's bevel opening, this forming die is from catch blank unloading, pre-roll and rolling circle one shot forming, carry out "centering two-way extrusion" through dabber, go up rolling die and lower rolling die blank and make the hole at the dabber shaping assurance size, go up, guarantee catch outside circularity after the lower rolling die butt joint simultaneously, this shaping mode avoids the catch opening dislocation that the gradual extrusion deformation of catch blank caused around the ring, the problem such as circularity is poor, this forming die simple structure, processing is convenient, shaping efficiency is high, and it is important moreover to have promoted the dimension uniformity of catch, thereby the locking performance uniformity after the rivet riveting has been guaranteed.
On the basis of the technical scheme, the invention can be improved as follows.
Further, the elastic limiting mechanism comprises a connecting bolt and a spring sleeved on the outer side of the connecting bolt, a limiting part is arranged in the lower die holder, a through hole for the rod part of the connecting bolt to pass through is formed in the limiting part, the aperture of the through hole is smaller than the outer diameter of the head part of the connecting bolt, the rod part of the connecting bolt passes through the through hole and is connected with the shaft die seat, and the spring is located between the limiting part and the shaft die seat.
The shaft die seat has the beneficial effects that the connecting bolt is connected with the shaft die seat, the purpose of preventing the shaft die seat from falling off is achieved through the limiting effect of the limiting part on the connecting bolt, certain movable requirements of the shaft die seat are met, and meanwhile the shaft die seat is prevented from falling off the lower die seat.
Further, the action end of the upper rolling die is also provided with a positioning part and a pair of clamping grooves symmetrically arranged, one clamping groove is arranged between the upper forming groove and the blanking part, the other clamping groove is arranged between the upper forming groove and the positioning part, the action end of the lower rolling die is provided with a pair of clamping protrusions matched with the clamping grooves, and the pair of clamping protrusions are symmetrically arranged on two sides of the lower forming groove.
The beneficial effect of adopting above-mentioned further scheme is, through draw-in groove and protruding cooperation of card go up the compound die block of rolling up mould and lower rolling up mould, the cooperation degree is better, and blank portion, locating part and draw-in groove and last shaping recess between the protruding catch that can act on the catch blank, the supplementary catch is bent in advance, satisfies catch blank and seals the requirement of shaping annular space, has guaranteed catch fashioned circularity, catch shaping precision and full degree are better.
Further, the feeding die is provided with a guide groove matched with the chamfer surface, and the fixed-length die is provided with a chamfer matched with the positioning surface of the positioning part.
The technical scheme has the beneficial effects that the upper rolling die which moves up and down is guided and limited through the guide grooves and the chamfers on the feeding die and the fixed-length die, and the die assembly accuracy of the upper rolling die and the lower rolling die is ensured.
Further, the positioning surface of the positioning part is of an inclined surface structure with the same inclination angle as the inclined surface.
The beneficial effect of adopting above-mentioned further scheme is, processing and location are convenient.
Further, the lower rolling die is integrally of an L-shaped structure and comprises a vertical forming portion and a horizontal mounting portion, the lower forming groove is formed in the free end of the vertical forming portion, and the horizontal mounting portion is arranged between the feeding die and the fixed-length die.
The upper rolling die and the lower rolling die are easy to damage parts, and the lower rolling die is convenient to maintain subsequently.
Further, a rolling die mounting groove for accommodating the lower rolling die is formed in the lower die base.
The lower rolling die has the advantages that the lower rolling die can be positioned through the feeding die and the fixed-length die, and the lower die holder can be provided with the rolling die mounting groove, so that the accuracy of the mounting position of the lower rolling die is improved.
Further, the width of the acting end of the lower rolling die is smaller than that of the acting end of the upper rolling die, and positioning bosses used for positioning the lower rolling die are further arranged on the inner surfaces of the feeding die and the fixed-length die.
The upper rolling die and the lower rolling die are both positioned between the feeding die and the fixed-length die, and the upper rolling die can be used for forming an annular cavity only by being matched with the central shaft, so that the width of the lower rolling die can be smaller than that of the upper rolling die, the lower rolling die with relatively small positioning width can be used for stably positioning, the inner surfaces of the feeding die and the fixed-length die can be additionally provided with the positioning boss, and the positioning boss can be abutted against the horizontal installation part of the lower rolling die, so that the requirement of stable installation of the lower rolling die is met.
Further, the lower die holder is further provided with a guide post for guiding the vertical motion of the shaft die holder, and the shaft die holder is provided with a post hole matched with the guide post.
The shaft die holder has the beneficial effects that the shaft die holder can move up and down along the guide post, and the guide post guides the up and down movements of the shaft die holder and the mandrel, so that the movement requirement of the shaft die holder under the action of the elastic limiting mechanism is met.
Further, the upper die mechanism further comprises an upper die pad, the upper die holder is arranged on the upper die pad, and/or the lower die mechanism further comprises a lower die pad, and the lower die holder is arranged on the lower die pad.
The upper die holder is connected with the press through the upper die pad, and the lower die holder is connected with the press through the lower die pad, so that the forming die is mounted on the press conveniently.
The invention also relates to a bending and forming method of the rivet lock ring for aviation and aerospace, which adopts the bending and forming die of the rivet lock ring for aviation and aerospace; the method comprises the following steps:
1) And (3) feeding: the lock ring blank enters between the upper rolling die and the mandrel through the feeding hole;
2) And (5) rolling and forming: the press machine acts, the upper die seat and the upper rolling die move downwards, the blanking part of the upper rolling die carries out bevel cutting, the lock ring blank is cut off, the upper rolling die moves downwards continuously, an upper forming groove of the upper rolling die acts on the lock ring blank, the lock ring blank is pre-rolled under the action of the upper rolling die and the mandrel, the upper die seat, the upper rolling die and the shaft die seat move downwards continuously along with the continuous action of the press machine, the open end of the lock ring blank contacts with the lower rolling die and rolls along the lower rolling die until the upper die mechanism and the lower die mechanism are matched, the upper rolling die, the lower rolling die and the mandrel form an annular cavity, and the lock ring is formed;
3) And (3) blanking: the press machine acts, the upper die mechanism moves upwards, the shaft die holder is reset under the action of the elastic limiting mechanism along with the upward movement of the upper die mechanism, the upper die mechanism moves upwards to reset, the upper rolling die is separated from the locking ring, and the locking ring is taken down.
The beneficial effects of the invention are as follows: the lock ring blank is positioned in the closed space formed by the upper rolling die, the mandrel and the lower rolling die in the molding process by adopting the molding method, the material with the material is forced to deform along the annular cavity, the material deformation is in a centering bidirectional extrusion state in the deformation process, the material is completely filled, the molding precision of the lock ring is high, and the molded lock ring structure has good plumpness, so that the uniformity of the molding size of the lock ring is obviously improved.
Drawings
FIG. 1 is a schematic diagram of a front view of the present invention;
FIG. 2 is a schematic cross-sectional view of FIG. 1 along the direction A-A;
FIG. 3 is a right side view of the present invention;
FIG. 4 is a schematic cross-sectional view of the structure of FIG. 3 along the direction B-B;
FIG. 5 is a schematic perspective view of the present invention;
FIG. 6 is a schematic perspective view of an upper rolling die of the invention;
FIG. 7 is a schematic view of the lower rolling die of the present invention;
FIG. 8 is a schematic diagram of the structure of the feeding mold and the fixed length mold of the present invention;
FIG. 9 is a schematic diagram of the loading state of the present invention;
FIG. 10 is an enlarged view of a portion of FIG. 9 at C;
FIG. 11 is a schematic diagram of the structure of the upper rolling die in the state of cutting and pre-bending in the descending manner;
FIG. 12 is an enlarged view of a portion of FIG. 11 at D;
FIG. 13 is a schematic view showing a completed state of the upper and lower winding dies with locking rings;
FIG. 14 is an enlarged view of a portion of FIG. 13 at E;
FIG. 15 is a schematic view of the configuration of the upper and lower dies mated to form an annular cavity;
FIG. 16 is a schematic view of the spindle reset state structure of the present invention;
FIG. 17 is a schematic diagram showing the blanking state of the upper die reset lock ring according to the present invention;
FIG. 18 is a schematic view of the lock ring and rivet engaged condition;
In the figure, 1, an upper die holder; 2. winding up a die; 201. a blanking part; 202. forming a groove; 203. a clamping groove; 204. a positioning part; 3. a lower die holder; 301. a limit part; 302. a through hole; 303. a winding die mounting groove; 4. a lower rolling die; 401. a lower molding groove; 402. a clamping protrusion; 403. a vertical molding part; 404. a horizontal mounting portion; 5. a mandrel; 6. a shaft die holder; 7. feeding a die; 701. a guide groove; 8. a fixed-length die; 801. chamfering; 9. a feeding hole; 10. an annular cavity; 11. a connecting bolt; 12. a spring; 13. positioning the boss; 14. a guide post; 15. an upper die pad; 16. a lower die pad; 17. a lock ring blank; 18. a locking ring.
Detailed Description
The principles and features of the present invention are described below in connection with examples, which are set forth only to illustrate the present invention and not to limit the scope of the invention.
As shown in fig. 1-8, the bending forming die for the rivet lock ring for aerospace comprises an upper die mechanism and a lower die mechanism, wherein the upper die mechanism comprises an upper die holder 1 and an upper rolling die 2 arranged on the upper die holder 1, a blanking part 201 for cutting off a lock ring blank 17 and an upper forming groove 202 for forming a lock ring 18 are arranged on the acting end of the upper rolling die 2, and the feeding end surface of the blanking part 201 is a chamfer;
The lower die mechanism comprises a lower die holder 3, a lower rolling die 4, a feeding die 7, a fixed-length die 8, a shaft die seat 6 and a mandrel 5 arranged on the shaft die seat 6, wherein the lower die holder 3 is provided with a slideway for the shaft die seat 6 to move up and down, the shaft die seat 6 is connected with the lower die holder 3 through at least one elastic limiting mechanism, the feeding die 7 and the fixed-length die 8 are arranged on the left side and the right side of the upper rolling die 2 and the lower rolling die 4, a feeding hole 9 for a blank 17 to pass through is formed on the feeding die 7 or between the feeding die 7 and the shaft die seat 6, the mandrel 5 is positioned between the upper rolling die 2 and the lower rolling die 4, the blank 17 enters into a lower molding groove 401 for 18 molding is formed on the action end of the lower rolling die 4 by abutting against the fixed-length die 8 between the upper rolling die 2 and the mandrel 5, and the annular cavity 10 for 18 molding is formed between the upper rolling die 2, the mandrel 5 and the lower rolling die 4 during die assembly.
The feeding hole 9 is formed in the feeding die 7, or a feeding groove is formed in the feeding die 7, and the feeding groove is matched with the shaft die seat 6 to form the feeding hole 9.
The elastic limiting mechanism comprises a connecting bolt 11 and a spring 12 sleeved on the outer side of the connecting bolt 11, a limiting portion 301 is arranged in the lower die holder, a through hole 302 for the rod portion of the connecting bolt 11 to pass through is formed in the limiting portion 301, the aperture of the through hole 302 is smaller than the outer diameter of the head portion of the connecting bolt 11, the rod portion of the connecting bolt 11 passes through the through hole 302 and is connected with the shaft die seat 6, and the spring 12 is located between the limiting portion 301 and the shaft die seat 6. The connecting bolt 11 is connected with the shaft die holder 6, and the purpose of preventing the shaft die holder 6 from falling off is achieved through the limiting effect of the limiting part 301 on the connecting bolt 11, so that the certain movable requirement of the shaft die holder 6 is met, and meanwhile, the shaft die holder 6 is prevented from falling off the lower die holder 3.
The upper rolling die 2 is provided with a positioning part 204 and a pair of clamping grooves 203 symmetrically arranged on the active end, wherein one clamping groove 203 is arranged between the upper forming groove 202 and the blanking part 201, the other clamping groove 203 is arranged between the upper forming groove 202 and the positioning part 204, the lower rolling die 4 is provided with a pair of clamping protrusions 402 matched with the clamping grooves 203 on the active end, and the pair of clamping protrusions 402 are symmetrically arranged on two sides of the lower forming groove 401. The clamping accuracy of the upper rolling die 2 and the lower rolling die 4 is guaranteed through the matching of the clamping groove 203 and the clamping protrusion 402, the matching degree is better, protrusions formed among the blanking part 201, the positioning part 204, the clamping groove 203 and the upper forming groove 202 can act on the lock ring blank 17 to assist the pre-bending of the lock ring 18, the requirement of the lock ring blank 17 for sealing and forming an annular space is met, the forming roundness of the lock ring 18 is guaranteed, and the forming precision and the full degree of the lock ring 18 are better.
The feeding die 7 is provided with a guide groove 701 matched with the chamfer surface, and the fixed-length die 8 is provided with a chamfer 801 matched with the positioning surface of the positioning part 204. The upper rolling die 2 which moves up and down is guided and limited through the guide grooves 701 and the chamfer 801 on the feeding die 7 and the fixed-length die 8, and the die assembly accuracy of the upper rolling die 2 and the lower rolling die 4 is ensured.
The positioning surface of the positioning portion 204 has a bevel structure with a same inclination angle as the bevel surface. The processing and the positioning are convenient.
The lower rolling die 4 is of an L-shaped structure, and comprises a vertical forming portion 403 and a horizontal mounting portion 404, the lower forming groove 401 is formed in the free end of the vertical forming portion 403, and the horizontal mounting portion 404 is arranged between the feeding die 7 and the fixed-length die 8. The lower rolling die 4 can be positioned through the horizontal mounting part 404, so that the positioning is convenient, meanwhile, the upper rolling die 2 and the lower rolling die 4 are wearing parts as forming dies, and the subsequent maintenance of the lower rolling die 4 is also convenient.
The lower die holder 3 is provided with a die mounting groove 303 for accommodating the lower die 4. The positioning of the lower rolling die 4 can be performed through the feeding die 7 and the fixed-length die 8, and of course, the rolling die mounting groove 303 can also be formed on the lower die holder 3, so that the accuracy of the mounting position of the lower rolling die 4 is improved.
The width of the acting end of the lower rolling die 4 is smaller than that of the acting end of the upper rolling die 2, and inner surfaces of the feeding die 7 and the fixed-length die 8 are also provided with inner positioning bosses 13 for positioning the lower rolling die 4. The upper rolling die 2 and the lower rolling die 4 are both positioned between the feeding die 7 and the fixed-length die 8, and as the upper rolling die 2 relates to feeding and positioning, the lower rolling die 4 can only be matched with the upper rolling die 2 and the mandrel 5 to form the annular cavity 10, so that the width of the lower rolling die 4 can be smaller than that of the upper rolling die 2, and the inner surfaces of the feeding die 7 and the fixed-length die 8 can be additionally provided with the inner positioning boss 13 for stably positioning the lower rolling die 4, and the inner positioning boss 13 can be abutted against the horizontal mounting part 404 of the lower rolling die 4 to meet the requirement of stable mounting of the lower rolling die 4.
The lower die holder 3 is also provided with a guide post 14 for guiding the vertical motion of the shaft die holder 6, and the shaft die holder 6 is provided with a post hole matched with the guide post 14. The concentric accurate positioning of the upper rolling die 2 and the lower rolling die 4 is ensured through the guide post 14, the shaft die seat 6 can move up and down along the guide post 14, and the guide post 14 guides the up and down movement of the shaft die seat 6 and the mandrel 5, so that the movement requirement of the shaft die seat 6 under the action of the elastic limiting mechanism is met.
The upper die mechanism further comprises an upper die pad 15, the upper die holder 1 is arranged on the upper die pad 15, and/or the lower die mechanism further comprises a lower die pad 16, and the lower die holder 3 is arranged on the lower die pad 16. The upper die holder 1 is connected with a press through an upper die pad 15, and the lower die holder 3 is connected with the press through a lower die pad 16, so that the installation of the forming die on the press is realized, and the installation is convenient.
The upper end of the upper rolling die 2 is provided with a limiting block, the upper rolling die 2 is inserted into a die hole of the upper die holder 1, the thickness of the limiting block is larger than that of the die hole, the upper rolling die 2 is limited at the position of the upper die holder 1 through the limiting block, then the upper die holder 1 is connected with an upper die pad 15, and the top of the upper rolling die 2 is positioned through the upper die pad 15, so that stable positioning of the upper rolling die 2 is realized.
As shown in fig. 9-17, the invention also relates to a bending forming method of the rivet lock ring for aerospace, which adopts the bending forming die of the rivet lock ring for aerospace; the method comprises the following steps:
1) And (3) feeding: the lock ring blank 17 enters between the upper rolling die 2 and the mandrel 5 through the feeding hole 9;
2) And (5) rolling and forming: the press machine acts, the upper die holder 1 and the upper rolling die 2 move downwards, the blanking part 201 of the upper rolling die 2 performs bevel cutting, the lock ring blank 17 is cut off, the upper rolling die 2 moves downwards continuously, the upper forming groove 202 of the upper rolling die 2 acts on the lock ring blank 17, the lock ring blank 17 is pre-rolled under the action of the upper rolling die 2 and the mandrel 5, namely, the lock ring blank 17 is pre-bent, the upper die holder 1, the upper rolling die 2 and the shaft die seat 6 move downwards continuously along with the continuous action of the press machine, the open end of the lock ring blank 17 is contacted with the lower rolling die 4 and rolled along the lower rolling die 4 until the upper die mechanism and the lower die mechanism are clamped, the upper rolling die 2, the lower rolling die 4 and the mandrel 5 form an annular cavity 10, and the lock ring 18 is formed;
3) And (3) blanking: the press machine acts, the upper die mechanism moves upwards, the shaft die seat 6 resets under the action of the elastic limiting mechanism along with the upward movement of the upper die mechanism, the upper die mechanism moves upwards to reset, the upper rolling die 2 is separated from the locking ring 18, and the locking ring 18 is taken down.
In the forming process, the lock ring blank 17 is positioned in the closed space, the material is forcedly deformed along the cavity, the material is completely filled, the forming precision is high, and the structural fullness is good; in the deformation process, the material is deformed in a centering bidirectional extrusion state, so that the consistency of the forming size of the material is improved.
The punch is used for completing one-time blanking and rolling forming processing of the locking ring 18 by one complete stroke, as shown in fig. 9 and 10, a strip material of the locking ring blank 17 enters through the feeding hole 9, can be straightened and positioned through the feeding hole 9, and contacts with the fixed-length die 8 through the free end of the strip material, so that the feeding length and the straightness are ensured; the press machine moves downwards to drive the upper die holder 1 to move downwards together with the upper rolling die 2, and after the locking ring blank 17 reaches a specified position, the blanking part 201 of the upper rolling die 2 cuts off the locking ring blank 17 in an inclined way, as shown in fig. 11 and 12, the upper rolling die 2 and the mandrel 5 pre-roll the cut locking ring blank 17, namely pre-bend; along with the continuous downward movement of the stroke of the punching machine, the upper die holder 1 contacts the shaft die holder 6 to extrude the spring 12, the upper rolling die 2 and the mandrel 5 synchronously move downward, the two ends of the opening of the lock ring blank 17 contact the lower rolling die 4 and continue rolling along the lower rolling die 4, finally the upper rolling die 2, the lower rolling die 4 and the mandrel 5 form an annular cavity 10 to form the lock ring 18, the lock ring 18 is formed, as shown in fig. 13 and 14, after the lock ring 18 is rolled, the upper die mechanism moves upward, the force is discharged by the spring 12, the mandrel 5 and the lock ring 18 move upward along with the upper rolling die 2, as shown in fig. 16, after the shaft die holder 6 resets, the upper rolling die 2 continues to move upward, the upper rolling die 2 is separated from the lock ring 18 to reset, as shown in fig. 17, the upper die mechanism returns to the initial state, and at the moment, the lock ring 18 is discharged, and the lock ring 18 on the mandrel 5 can be manually removed. The upper rolling die 2, the lower rolling die 4 and the mandrel 5 cooperate with each other to ensure the circularity of the locking ring 18 in the rolling process; in the forming process, the lock ring blank 17 is positioned in a closed space formed by the upper rolling die 2 and the lower rolling die 4, the material of the lock ring blank 17 is forced to deform along the annular cavity 10, the material completely fills the annular cavity 10, the forming precision is high, and the structural fullness is good; the material deformation of the lock ring blank 17 is in a centering bidirectional extrusion state in the deformation process, so that the consistency of the forming size is improved. The annular roundness and opening size consistency of the locking ring 18 are obviously improved through the forming die and the forming method, so that the locking performance of the rivet is improved, and the rivet product has the characteristics of dead weight reduction, wind resistance reduction and looseness prevention.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The rivet lock ring bending forming die for aerospace is characterized by comprising an upper die mechanism and a lower die mechanism, wherein the upper die mechanism comprises an upper die holder (1) and an upper rolling die (2) arranged on the upper die holder (1), a blanking part (201) for cutting off lock ring blanks (17) and an upper forming groove (202) for forming lock rings (18) are arranged at the action end of the upper rolling die (2), and the feeding end face of the blanking part (201) is a chamfer;
The lower die mechanism comprises a lower die holder (3), a lower rolling die (4) arranged on the lower die holder (3), a feeding die (7), a fixed-length die (8), a shaft die seat (6) and a mandrel (5) arranged on the shaft die seat (6), wherein the lower die holder (3) is provided with a slide way for the shaft die seat (6) to move up and down, the shaft die seat (6) is connected with the lower die holder (3) through at least one elastic limiting mechanism, the feeding die (7) and the fixed-length die (8) are arranged on the left side and the right side of the upper rolling die (2) and the lower rolling die (4), a feeding hole (9) for a locking ring (17) to pass through is arranged on the feeding die (7) or between the feeding die (7) and the shaft die seat (6), the mandrel (5) is positioned between the upper rolling die (2) and the lower rolling die (4), the locking ring (17) enters into a gap between the upper rolling die (2) and the mandrel (5) and the lower rolling die (4), and the locking ring (8) is provided with a fixed-length die (401) for forming end (401) when the upper rolling die (4) is in contact with the upper rolling die (4), and the lower rolling die (4) is provided with a fixed-length die (401) and a lower die (401) for forming end An annular cavity (10) for forming a locking ring (18) is formed between the mandrel (5) and the lower rolling die (4).
2. The bending and forming die for the rivet lock ring for aerospace according to claim 1, wherein the elastic limiting mechanism comprises a connecting bolt (11) and a spring (12) sleeved outside the connecting bolt (11), a limiting portion (301) is arranged in the lower die holder (3), a through hole (302) for a rod portion of the connecting bolt (11) to pass through is formed in the limiting portion (301), the aperture of the through hole (302) is smaller than the outer diameter of the head portion of the connecting bolt (11), the rod portion of the connecting bolt (11) passes through the through hole (302) and is connected with the shaft die seat (6), and the spring (12) is located between the limiting portion (301) and the shaft die seat (6).
3. The bending and forming die for the rivet lock ring for aerospace according to claim 1, wherein a positioning part (204) and a pair of clamping grooves (203) which are symmetrically arranged are further arranged on the acting end of the upper rolling die (2), one clamping groove (203) is arranged between the upper forming groove (202) and the blanking part (201), the other clamping groove (203) is arranged between the upper forming groove (202) and the positioning part (204), a pair of clamping protrusions (402) which are matched with the clamping grooves (203) are arranged on the acting end of the lower rolling die (4), and the pair of clamping protrusions (402) are symmetrically arranged on two sides of the lower forming groove (401).
4. The bending and forming die for the rivet lock ring for aerospace according to claim 3, characterized in that a guide groove (701) matched with the chamfer surface is formed on the feeding die (7), and a chamfer (801) matched with the positioning surface of the positioning part (204) is formed on the fixed-length die (8); and/or the positioning surface of the positioning part (204) is of a bevel structure with the same bevel angle as the bevel surface.
5. The bending and forming die for the rivet lock ring for aerospace according to any one of claims 1 to 4, wherein the lower rolling die (4) is of an L-shaped structure as a whole and comprises a vertical forming part (403) and a horizontal mounting part (404), the lower forming groove (401) is formed in the free end of the vertical forming part (403), and the horizontal mounting part (404) is arranged between the feeding die (7) and the fixed-length die (8).
6. The bending mold for an aerospace rivet lock ring according to claim 5, wherein a coil mold mounting groove (303) for accommodating the lower coil mold (4) is provided on the lower die holder (3).
7. The bending forming die for the rivet lock ring for aerospace according to any one of claims 1 to 4, wherein the width of the acting end of the lower rolling die (4) is smaller than that of the acting end of the upper rolling die (2), and inner surfaces of the feeding die (7) and the fixed-length die (8) are further provided with inner positioning bosses (13) for positioning the lower rolling die (4).
8. The bending and forming die for the rivet lock ring for aerospace according to any one of claims 1 to 4, wherein a guide post (14) for guiding the up-and-down motion of the shaft die holder (6) is further arranged on the lower die holder (3), and a post hole matched with the guide post (14) is formed in the shaft die holder (6).
9. The bending and forming die for a rivet lock ring for aerospace according to any one of claims 1 to 4, characterized in that the upper die mechanism further comprises an upper die pad (15), the upper die holder (1) is provided on the upper die pad (15), and/or the lower die mechanism further comprises a lower die pad (16), the lower die holder (3) is provided on the lower die pad (16).
10. A method for bending and forming a rivet lock ring for aerospace, characterized in that the rivet lock ring for aerospace is used as described in any one of claims 1 to 9; the method comprises the following steps:
1) And (3) feeding: the lock ring blank (17) enters between the upper rolling die (2) and the mandrel (5) through the feeding hole (9);
2) And (5) rolling and forming: the press machine acts, the upper die mechanism moves downwards, the upper die holder (1) and the upper rolling die (2) move downwards, a blanking part (201) of the upper rolling die (2) carries out bevel blanking, a lock ring blank (17) is cut off, the upper rolling die (2) continues to move downwards, an upper forming groove (202) of the upper rolling die (2) acts on the lock ring blank (17), the lock ring blank (17) is pre-rolled under the action of the upper rolling die (2) and the mandrel (5), the upper die holder (1), the upper rolling die (2) and the shaft die seat (6) continue to move downwards along with the continuous action of the press machine, the open end of the lock ring blank (17) is contacted with the lower rolling die (4) and is rolled along the lower rolling die (4) until the upper die mechanism and the lower die mechanism are clamped, the upper rolling die (2), the lower rolling die (4) and the mandrel (5) form an annular cavity (10), and the lock ring (18) is formed;
3) And (3) blanking: the press machine acts, the upper die mechanism moves upwards, the shaft die holder (6) resets under the action of the elastic limiting mechanism along with the upward movement of the upper die mechanism, the upper die mechanism moves upwards to reset, the upper rolling die (2) is separated from the locking ring (18), and the locking ring (18) is taken down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410611951.6A CN118180213B (en) | 2024-05-17 | 2024-05-17 | Rivet lock ring bending forming die and method for aerospace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410611951.6A CN118180213B (en) | 2024-05-17 | 2024-05-17 | Rivet lock ring bending forming die and method for aerospace |
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| Publication Number | Publication Date |
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| CN118180213A true CN118180213A (en) | 2024-06-14 |
| CN118180213B CN118180213B (en) | 2024-09-03 |
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| CN202410611951.6A Active CN118180213B (en) | 2024-05-17 | 2024-05-17 | Rivet lock ring bending forming die and method for aerospace |
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| KR20130117925A (en) * | 2012-04-19 | 2013-10-29 | (주)다우테크놀로지 | Cylinder type sleeve fasten device and method |
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| Publication number | Publication date |
|---|---|
| CN118180213B (en) | 2024-09-03 |
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