CN109201807B - Gear chain type core rod for bending and forming circular pipe - Google Patents
Gear chain type core rod for bending and forming circular pipe Download PDFInfo
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- CN109201807B CN109201807B CN201811075821.6A CN201811075821A CN109201807B CN 109201807 B CN109201807 B CN 109201807B CN 201811075821 A CN201811075821 A CN 201811075821A CN 109201807 B CN109201807 B CN 109201807B
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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
- B21D9/00—Bending tubes using mandrels or the like
- B21D9/01—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length
- B21D9/03—Bending tubes using mandrels or the like the mandrel being flexible and engaging the entire tube length and built-up from loose elements, e.g. series of balls
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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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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Abstract
The invention discloses a gear chain type core rod for bending and forming a circular pipe, which comprises more than 1 core balls for supporting the bent pipe section of the circular pipe, a core shaft for supporting the straight line section of the circular pipe and gear chain type connecting bodies for connecting the core balls and between the core balls and the core shaft; the gear chain type connecting body comprises a single-side gear plate, double-side gear plates, connecting sheets, a long limiting ring, a short limiting ring and a shaft; the core ball is a spherical shell, a first installation cavity is formed in the shell, and the mandrel is of a cylindrical structure. The invention has certain universality, can be suitable for bending and forming the thin-wall pipe with large diameter-thickness ratio and small bending radius, and has high supporting precision.
Description
Technical Field
The invention relates to a gear chain type core rod for bending and forming a round pipe.
Background
The metal thin-wall hollow pipe fitting has the advantages of high strength, light weight, easy molding, attractive appearance and the like, and is widely applied to the fields of aviation, aerospace, vehicles, ships, petrochemical industry and the like. However, when the thin-wall pipe with large diameter-thickness ratio (D/t > 50) and small bending radius (R/D < 2) is formed by numerical control bending, the inner side pipe wall of the bent pipe is pressed, so that the bent pipe is very easy to unstably wrinkle; the outer side is pulled to be thinned, so that the outer side is easy to crack; the resultant force of the two causes the cross section of the bent pipe to be flattened and distorted and even collapse, so the forming difficulty is great.
In order to reduce the bending defects of thin-walled tubes with large radius-to-thickness ratio and small bending radius, a mandrel is required to be installed inside the thin-walled tube to provide internal support. The most common types of mandrels are ball-and-socket type mandrels and chained mandrels. A large gap exists between the ball and the socket of the core rod bead of the ball socket type core rod, and a large gap exists between the shaft of the chain type core rod and the chain sheet, so that the core ball can naturally droop due to self weight and cannot be fixed at a specific position. And a gap is also formed between the core rod and the thin-wall pipe, so that the support precision of the core rod to the thin-wall pipe is not high, and the bending precision of the thin-wall pipe with large diameter-thickness ratio and small bending radius is affected.
Disclosure of Invention
The invention aims to solve the problems that a core ball of the existing core rod can naturally sag due to dead weight and cannot be fixed at a certain specific position, the existing core rod is low in supporting precision of a thin-wall pipe and affects bending precision of the thin-wall pipe with a large radius-thickness ratio and a small bending radius, and provides a gear chain type core rod for bending and forming a round pipe, which has certain universality and can be suitable for bending and forming the thin-wall pipe with the large radius-thickness ratio and the small bending radius and is high in supporting precision.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a gear chain type core rod for bending and forming a round pipe comprises more than 1 core balls for supporting a round pipe bending section, a core shaft for supporting a round pipe straight line section and gear chain type connecting bodies for connecting the core balls and between the core balls and the core shaft; the gear chain type connecting body comprises a single-side gear plate, double-side gear plates, connecting sheets, a long limiting ring, a short limiting ring and a shaft; the core ball is a spherical shell, a first installation cavity is formed in the shell, and the mandrel is of a cylindrical structure;
the number of the core balls is the logarithm+1 of the double-sided gear plates, and each pair of the double-sided gear plates is 2; the two pairs of unilateral gear plates are respectively positioned at two ends of the bilateral gear plates, and more than 1 pair of bilateral gear plates are arranged between the 2 pairs of unilateral gear plates.
One end of the unilateral gear plate is provided with semicircular teeth, the circle center of the semicircular teeth on the unilateral gear plate is provided with 1 first shaft mounting through holes, and the unilateral gear plate and the circle center of the semicircular teeth are also provided with 1 first shaft mounting through holes at the same height; semicircular teeth are respectively processed at two ends of the double-side gear plate, and a first shaft mounting through hole is also formed in the circle center position of each semicircular tooth on the double-side gear plate; the semicircular teeth on the unilateral gear plate are meshed with the semicircular teeth on one side of the bilateral gear plate; the adjacent 2 double-side gear plates are also meshed and connected through semicircular teeth;
two semicircles are processed at the two ends of the connecting sheet, and a second shaft mounting through hole is formed in the center of each semicircle; the two sides of the semicircular teeth on the unilateral gear plate and the semicircular teeth on the bilateral gear plate are respectively provided with connecting sheets;
the long limiting ring and the short limiting ring are hollow cylinders, and a third shaft mounting through hole is formed in the long limiting ring and the short limiting ring;
the two single-side gear plates are connected with each other through shaft clearance fit, and the two single-side gear plates are connected with each other through shaft clearance fit; the two side gear plates 1, the short limiting ring and the other 1 are connected through shaft clearance fit installation; the same connecting piece is arranged on the shaft between the adjacent single-side gear plate and the adjacent double-side gear plate or between the adjacent double-side gear plate and the adjacent double-side gear plate, namely the shaft sequentially passes through a second shaft installation through hole on 1 connecting piece, a first shaft installation through hole on the circle center of the 1 single-side gear plate, a second shaft installation through hole on the 2 nd connecting piece, a third shaft installation through hole on the short limiting ring, a second shaft installation through hole on the 3 rd connecting piece, a first shaft installation through hole on the circle center of the 2 nd single-side gear plate and a second shaft installation through hole on the 4 th connecting piece; the shaft sequentially passes through a second shaft mounting through hole on the 1 connecting sheet, a first shaft mounting through hole on the 1 double-sided gear plate, a second shaft mounting through hole on the 2 nd connecting sheet, a third shaft mounting through hole on the short limiting ring, a second shaft mounting through hole on the 3 rd connecting sheet, a first shaft mounting through hole on the 2 nd double-sided gear plate and a second shaft mounting through hole on the 4 th connecting sheet; the shaft also sequentially passes through a first shaft installation through hole on the non-circle center of the 1 single-side gear plate, a third shaft installation through hole on the long limiting ring and a first shaft installation through hole on the circle center of the 2 nd single-side gear plate.
The wall surface of the shell at one side of the first installation cavity on the core ball is provided with a first installation surface of the connecting sheet; a fourth shaft mounting through hole is formed in the first mounting surface; the gear chain type connector is arranged in the first installation cavity, the first installation surface is attached to the connecting sheet, a shaft is arranged in the fourth shaft installation through hole of the core ball, and the shaft is in interference fit with the fourth shaft installation through hole of the core ball; an inclined plane is arranged on the shell at the longitudinal center line position of the first installation cavity. A second mounting cavity is formed in one end, close to the core ball, of the core shaft, and a second mounting surface of the connecting sheet is formed in the wall surface of the shell on one side of the second mounting cavity; a fifth shaft mounting through hole is formed in the second mounting surface; the gear chain type connector is arranged in the second installation cavity, the second installation surface is attached to the connecting sheet, a shaft is arranged in the fifth shaft installation through hole of the mandrel, and the shaft is in interference fit with the fifth shaft installation through hole of the mandrel;
the central position of the other end of the mandrel is provided with a hole with internal threads, the outer surface of the mandrel is provided with a mounting platform, and the mounting platform is provided with a mounting through hole.
The long limiting ring and the unilateral gear plates on the two sides of the long limiting ring are both arranged in the second installation cavity of the mandrel or the first installation cavity of the outermost core ball; the short limiting rings and the double-sided gear plates on the two sides of the short limiting rings are arranged in the first installation cavities of the other core balls except the outermost core ball.
The beneficial effects of the invention are as follows:
1) The core balls are connected with each other and are connected with the mandrel through chain connection meshed with gears, so that the core balls can be positioned at any position, the supporting precision of the mandrel on the thin-wall tube is improved, and the bending precision of the thin-wall tube can be improved.
2) The inclination is arranged on the inner side of the core ball close to the bending, so that the bonding between the core balls is tighter, and the pipe fitting bending with small bending radius is facilitated.
3) The meshing relationship between two adjacent gear plates is ensured by the distance between the two core balls or the distance between the core shaft and the core balls through the connection and the restraint of 4 connecting sheets.
4) The shaft connects the core ball and the gear chain connection while also providing a rotational axis for engagement between adjacent two gear plates.
5) The gear chain type connector and the core balls are in modularized design, and the number of the core balls and the length of the gear chain type connector can be installed according to actual needs.
6) The shaft is in interference fit with the core balls and the mandrel, and the shaft is in clearance fit with the unilateral gear plate, the bilateral gear plates, the connecting sheet, the long limiting ring and the short limiting ring, so that angles between the core balls and the mandrel are adjusted through gear meshing, and the precision is high.
7) The cylindrical mandrel and the spherical core ball are suitable for providing internal support for bending round pipes of various specifications and sizes.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an enlarged schematic view of the gear chain type connection of FIG. 1;
FIG. 3 is an enlarged schematic view of the one-sided gear plate of FIG. 1;
FIG. 4 is an enlarged schematic view of the double sided gear plate of FIG. 1;
FIG. 5 is an enlarged schematic view of the connecting tab of FIG. 1;
FIG. 6 is an enlarged schematic view of the core ball of FIG. 1;
FIG. 7 is an enlarged schematic cross-sectional view of the mandrel of FIG. 1;
fig. 8 is a schematic view of the long stop collar of fig. 1.
Detailed Description
The gear chain type core rod for bending and forming the round pipe in the embodiment comprises more than 1 core balls 1 for supporting the bent pipe section of the round pipe, a mandrel 2 for supporting the straight line section of the round pipe and a gear chain type connector 3 for connecting the core balls 1 and connecting the core balls 1 and the mandrel 2 as shown in figures 1-8; the gear chain type connector 3 comprises a single-side gear plate 31, a double-side gear plate 32, a connecting sheet 33, a long limiting ring 34, a short limiting ring 35 and a shaft 36; the core ball 1 is a shell 14 with a spherical structure, a first installation cavity 11 is formed in the shell 14, and the mandrel 2 is a mandrel with a cylindrical structure;
the single-side gear plates 31 are divided into 2 pairs, each pair is 2, the number of the core balls 1 is the logarithm+1 of the double-side gear plates 32, and each pair of the double-side gear plates 32 is 2; the 2 pairs of unilateral gear plates 31 are respectively positioned at two ends of the bilateral gear plates 32, and more than 1 pair of bilateral gear plates 32 are arranged between the 2 pairs of unilateral gear plates 31.
One end of the unilateral gear plate 31 is provided with a semicircular tooth 311, the center position of the semicircular tooth 311 on the unilateral gear plate 31 is provided with 1 first shaft mounting through hole 312, and the unilateral gear plate 31 and the center of the semicircular tooth 311 are provided with 1 first shaft mounting through hole 312 at the same height; semicircular teeth 311 are respectively processed at two ends of the double-sided gear plate 32, and a first shaft mounting through hole 312 is also formed in the center of the semicircular teeth 311 on the double-sided gear plate 32; the semicircular teeth 311 on the unilateral gear plate 31 are meshed with the semicircular teeth 311 on one side of the bilateral gear plate 32; the adjacent 2 double-sided gear plates 32 are also meshed and connected through semicircular teeth 311;
two semicircles 331 are processed at the two ends of the connecting sheet 33, and a second shaft mounting through hole 332 is formed in the center of the two semicircles 331; the two sides of the semicircular teeth 311 on the unilateral gear plate 31 and the semicircular teeth 311 on the bilateral gear plate 32 are respectively provided with a connecting sheet 33; the long limiting ring 34 and the short limiting ring 35 are hollow cylinders, and a third shaft mounting through hole 341 is formed in the long limiting ring 34 and the short limiting ring 35;
wherein 1 single-side gear plate 31, long spacing ring 34 and another 1 single-side gear plate 31 are connected by shaft 36 in clearance fit, and 1 single-side gear plate 31, short spacing ring 35 and another 1 single-side gear plate 31 are also connected by shaft 36 in clearance fit; 1 two side gear plates 32, a short limiting ring 35 and the other 1 side gear plate 32 are connected through the clearance fit installation of a shaft 36; the same connecting piece 33 is installed on the shaft 36 between the adjacent single-side gear plate 31 and the adjacent double-side gear plate 32 or between the adjacent double-side gear plate 32 and the adjacent double-side gear plate 32, namely, the shaft 36 sequentially passes through the second shaft installation through hole 332 on the 1 connecting piece 33, the first shaft installation through hole 312 on the center of the circle of the 1 single-side gear plate 31, the second shaft installation through hole 332 on the 2 nd connecting piece 33, the third shaft installation through hole 341 on the short limiting ring 35, the second shaft installation through hole 332 on the 3 rd connecting piece 33, the first shaft installation through hole 312 on the center of the 2 nd single-side gear plate 31 and the second shaft installation through hole 332 on the 4 th connecting piece 33; the shaft 36 sequentially passes through the second shaft mounting through holes 332 on the 1 connecting sheet 33, the first shaft mounting through holes 312 on the 1 double-sided gear plate 32, the second shaft mounting through holes 332 on the 2 nd connecting sheet 33, the third shaft mounting through holes 341 on the short limiting ring 35, the second shaft mounting through holes 332 on the 3 rd connecting sheet 33, the first shaft mounting through holes 312 on the 2 nd double-sided gear plate 32 and the second shaft mounting through holes 332 on the 4 th connecting sheet 33; the shaft 36 also sequentially passes through the first shaft mounting through hole 312 on the non-center of the 1 single-side gear plate 31, the third shaft mounting through hole 341 on the long limiting ring 34, and the first shaft mounting through hole 312 on the center of the 2 nd single-side gear plate 31.
The wall surface of the shell 14 on one side of the first installation cavity 11 on the core ball 1 is provided with a first installation surface 12 of a connecting sheet 33; a fourth shaft mounting through hole 13 is formed in the first mounting surface 12; the gear chain type connector 3 is arranged in the first installation cavity 11, the first installation surface 12 is attached to the connecting sheet 33, a shaft 36 is arranged in the fourth shaft installation through hole 13 of the core ball 1, and the shaft 36 is in interference fit with the fourth shaft installation through hole 13 of the core ball 1; an inclined surface 15 is formed on the shell 14 at the longitudinal center line position of the first installation cavity 11. A second mounting cavity 21 is formed at one end, close to the core ball 1, of the core shaft 2, and a second mounting surface 22 of a connecting sheet 33 is formed on the wall surface of the shell at one side of the second mounting cavity 21; a fifth shaft mounting through hole 23 is formed in the second mounting surface 22; the gear chain type connector 3 is arranged in the second installation cavity 21, the second installation surface 22 is attached to the connecting sheet 33, the shaft 36 is arranged in the fifth shaft installation through hole 23 of the mandrel 2, and the shaft 36 is in interference fit with the fifth shaft installation through hole 23 of the mandrel 2.
The central position of the other end of the mandrel 2 is provided with a hole 24 with internal threads, the outer surface of the mandrel 2 is provided with a mounting platform 25, and the mounting platform 25 is provided with a mounting through hole 26.
The long limiting ring 34 and the unilateral gear plates 31 on the two sides of the long limiting ring are both arranged in the second installation cavity 21 of the mandrel 2 or the first installation cavity 11 of the outermost core ball 1; the short stop collar 35 and the double-sided gear plates 32 on both sides thereof are mounted in the first mounting cavities 11 of the other core balls 1 except for the outermost core ball 1.
In the mounting, first, the spindle 2 and the gear chain connector 3 are mounted. Knocking the first shaft 36 into the second mounting cavity 21 from the fifth shaft mounting through hole 23 on the outer side of the mandrel 2 by a certain distance, then mounting the first shaft mounting through hole 312 of the first one-sided gear plate 31 and the first long limiting ring 34 on the first shaft 36, and ensuring that the semicircular teeth 311 of the first one-sided gear plate 31 are in the second mounting cavity 21 of the mandrel 2; then the first shaft 36 is knocked into the second mounting cavity 21 for a distance, and the second single-side gear plate 31 is also mounted on the first shaft 36; finally, the first shaft 36 is entirely driven into the mandrel 2.
Knocking the second shaft 36 into the second mounting cavity 21 from the fifth shaft mounting through hole 23 on the outer side of the mandrel 2 for a certain distance, mounting one of the second shaft mounting through holes 332 of the first connecting piece 33 on the second shaft 36, sleeving the first shaft mounting through hole 312 in the center of the semicircular tooth 311 of the first unilateral gear plate 31 of the previous step on the second shaft 36, and sequentially mounting one of the second shaft mounting through holes 332 of the second connecting piece 33, the first short limiting ring 35 and one of the second shaft mounting through holes 332 of the third connecting piece 33 on the second shaft 36; knocking the second shaft 36 into the second mounting cavity 21 by a certain distance, and mounting one of the second shaft mounting through holes 332 on the fourth connecting piece 33 and the second unilateral gear plate 31 of the previous step on the second shaft 36; finally, the second shaft 36 is entirely driven into the mandrel 2.
Then, the intermediate 1 st core ball 1 and the gear chain type connector 3 are installed. Firstly, the third shaft 36 is knocked into the first installation cavity 11 for a certain distance from the fourth shaft installation through hole 13 on the outer side of the 1 st core ball 1 in the middle; the other second shaft mounting through hole 332 on the first connecting piece 33 of the previous step is sleeved on the third shaft 36, and then the first shaft mounting through hole 312 where one semicircular tooth 311 on the first double-sided gear plate 32 is positioned is filled, and the other semicircular tooth 311 of the first double-sided gear plate 32 is ensured to be positioned in the first mounting cavity 11; the second connecting piece 33 of the previous step is sleeved on the third shaft 36, the second short limiting ring 35 is sleeved on the third shaft 36, the third connecting piece 33 of the previous step is sleeved on the third shaft 36, the first shaft mounting through hole 312 where one semicircular tooth 311 of the second double-side gear plate 32 is positioned is similarly arranged, and the fourth connecting piece 33 of the previous step is sleeved on the third shaft 36; finally, the third shaft 36 is entirely driven into the 1 st core ball 1. So that the half-tooth 311 on the first one-sided gear plate 31 is in meshed engagement with one of the half-teeth 311 on the first two-sided gear plate 32; the half-round teeth 311 on the second one-sided gear plate 31 are in meshed engagement with one of the half-round teeth 311 on the second two-sided gear plate 32. Similarly, according to the mounting method of the third shaft 36, the fourth shaft 36 is sleeved in one of the second shaft mounting through holes 332 on the fifth connecting piece 33, the first shaft mounting through hole 312 where the other semicircular tooth 311 of the first double-sided gear plate 32 is located, one of the second shaft mounting through holes 332 on the sixth connecting piece 33, the third short stop collar 35, one of the second shaft mounting through holes 332 on the seventh connecting piece 33, the first shaft mounting through hole 312 where the other semicircular tooth 311 of the second double-sided gear plate 32 is located, one of the second shaft mounting through holes 332 on the eighth connecting piece 33, and the fourth shaft 36 is also all knocked into the 1 st core ball 1.
In the embodiment, 4 core balls are adopted, and then the 1 st core ball 1 is connected with the 2 nd core ball 1 through the installation of the gear chain type connector 3; the fifth shaft 36 is knocked into the first installation cavity 11 for a certain distance from the fourth shaft installation through hole 13 on the outer side of the 2 nd core ball 1; the other second shaft mounting through hole 332 on the fifth connecting piece 33 of the previous step is sleeved on the fifth shaft 36, and then is sleeved on the first shaft mounting through hole 312 where one semicircular tooth 311 on the third double-sided gear plate 32 is positioned, and the other semicircular tooth 311 of the third double-sided gear plate 32 is ensured to be positioned in the first mounting cavity 11; the sixth connecting piece 33 of the previous step is sleeved on the fifth shaft 36, the fourth short limiting ring 35 is sleeved on the fifth shaft 36, the seventh connecting piece 33 of the previous step is sleeved on the fifth shaft 36, the first shaft mounting through hole 312 where one of the semicircular teeth 311 on the fourth double-sided gear plate 32 is positioned is similarly arranged, and the eighth connecting piece 33 of the previous step is sleeved on the fifth shaft 36; finally, the fifth shaft 36 is entirely driven into the 2 nd core ball 1. So that the other half tooth 311 of the first double-sided gear plate 32 is in meshed engagement with one of the half teeth 311 on the third double-sided gear plate 32; so that the other half-tooth 311 of the second double-sided gear plate 32 is in meshed engagement with one of the half-teeth 311 on the fourth double-sided gear plate 32; similarly, according to the mounting method of the fifth shaft 36, the sixth shaft 36 is sequentially sleeved into one of the second shaft mounting through holes 332 on the ninth connecting piece 33, the first shaft mounting through hole 312 where the other semicircular tooth 311 of the third double-sided gear plate 32 is located, one of the second shaft mounting through holes 332 on the tenth connecting piece 33, the fifth short stop collar 35, one of the second shaft mounting through holes 332 on the eleventh connecting piece 33, the first shaft mounting through hole 312 where the other semicircular tooth 311 of the fourth double-sided gear plate 32 is located, one of the second shaft mounting through holes 332 on the twelfth connecting piece 33, and the sixth shaft 36 is also all knocked into the 2 nd core ball 1.
The seventh shaft 36 is fitted into the other second shaft mounting through hole 332 of the ninth connecting piece 33, the first shaft mounting through hole 312 of one of the semicircular teeth 311 of the fifth double-sided gear plate 32, the other second shaft mounting through hole 332 of the tenth connecting piece 33, the sixth short retainer ring 35, the other second shaft mounting through hole 332 of the eleventh connecting piece 33, the first shaft mounting through hole 312 of one of the semicircular teeth 311 of the sixth double-sided gear plate 32, the other second shaft mounting through hole 332 of the twelfth connecting piece 33, and the seventh shaft 36 is also all knocked into the 3 rd core ball 1, in this order. So that the other half-tooth 311 of the third double-sided gear plate 32 is in meshed engagement with one of the half-teeth 311 on the fifth double-sided gear plate 32; so that the other half-tooth 311 of the fourth double-sided gear plate 32 is in meshed engagement with one of the half-teeth 311 on the sixth double-sided gear plate 32. Then, the eighth shaft 36 is sequentially fitted into one of the second shaft mounting through holes 332 in the thirteenth connecting piece 33, the first shaft mounting through hole 312 in which the other semicircular tooth 311 of the fifth double-sided gear plate 32 is located, one of the second shaft mounting through holes 332 in the fourteenth connecting piece 33, the seventh short retainer ring 35, one of the second shaft mounting through holes 332 in the fifteenth connecting piece 33, the first shaft mounting through hole 312 in which the other semicircular tooth 311 of the sixth double-sided gear plate 32 is located, one of the second shaft mounting through holes 332 in the sixteenth connecting piece 33, and the eighth shaft 36 is also all knocked into the 3 rd core ball 1.
Finally, the 4 th core ball 1 and the gear chain type connector 3 at the outermost end are installed. According to the same manner as described above, the ninth shaft 36 is fitted into the other second shaft mounting through hole 332 in the thirteenth connecting piece 33, the first shaft mounting through hole 312 in the center of the third one-sided gear plate 31, the other second shaft mounting through hole 332 in the fourteenth connecting piece 33, the eighth short retainer ring 35, the other second shaft mounting through hole 332 in the fifteenth connecting piece 33, the first shaft mounting through hole 312 in the center of the fourth one-sided gear plate 31, the other second shaft mounting through hole 332 in the sixteenth connecting piece 33 in this order, and the ninth shaft 36 is also all driven into the fourth shaft mounting through hole 13 inside the 4 th core ball 1. So that the other semicircular tooth 311 of the fifth double-sided gear plate 32 is engaged with the first shaft-mounting through hole 312 on the center of the circle of the third single-sided gear plate 31; so that the other half-round tooth 311 of the sixth double-sided gear plate 32 is engaged with the first shaft-mounting through hole 312 on the center of the circle of the fourth single-sided gear plate 31. Then the first shaft mounting through hole 312 of the third unilateral gear plate 31 far from the circle center is sleeved on the tenth shaft 36, the second long limiting ring 34 is installed on the tenth shaft 36, and the first shaft mounting through hole 312 of the fourth unilateral gear plate 31 far from the circle center is sleeved on the tenth shaft 36; finally, the tenth shaft 36 is entirely driven into the 4 th core ball 1.
After all the gear chain type core rods for bending and forming the round pipe are installed, the core rods are installed on the pipe bending machine through the holes 24 of the internal threads at the tail end of the core shaft 2, and are positioned at the installation through holes 26 through pins, so that the installation of the core rods on the pipe bending machine is completed.
The gear chain type core rod for bending and forming the round pipe of the embodiment is characterized in that the connection and the restraint of the relation between the core ball and between the core ball and the core shaft are realized through chain connection meshed with gears, so that the core ball can be positioned at any position, the supporting precision of the core rod on the thin-wall pipe is improved, and the bending precision of the thin-wall pipe is improved. The second core ball is provided with the inclination near the bending inboard, makes laminating more inseparable between the core ball, is favorable to realizing the pipe fitting bending of little bend radius. The third two core balls or the core shaft and the core balls are connected and restrained through 4 connecting sheets, so that the meshing relationship between the two adjacent gear plates is ensured. The fourth shaft connects the core ball and the gear chain connection and also provides a rotational axis for engagement between adjacent two gear plates. The fifth gear chain type connector and the core balls are in a modularized design, and the number of the core balls and the length of the gear chain type connector required by installation can be set according to actual needs. The sixth shaft is in interference fit with the core balls and the mandrel, and is in clearance fit with the unilateral gear plate, the bilateral gear plates, the connecting sheet, the long limiting ring and the short limiting ring, so that angles between the core balls and the mandrel are adjusted through gear meshing, and the precision is high. The mandrel and spherical core ball of the seventh cylinder are suitable for providing internal support for bending round tubes of various specifications and sizes.
Claims (2)
1. The gear chain type core rod for bending and forming the round pipe is characterized by comprising more than 1 core balls (1) for supporting the bent pipe section of the round pipe, a core shaft (2) for supporting the straight line section of the round pipe and gear chain type connecting bodies (3) for connecting the core balls (1) and connecting the core balls (1) and the core shaft (2); the gear chain type connecting body (3) comprises a single-side gear plate (31), double-side gear plates (32), connecting pieces (33), a long limiting ring (34), a short limiting ring (35) and a shaft (36); the core ball (1) is a shell (14) with a spherical structure, a first installation cavity (11) is formed in the shell (14), and the mandrel (2) is a mandrel with a cylindrical structure;
the number of the core balls (1) is the logarithm+1 of the double-sided gear plates (32), and each pair of the double-sided gear plates (32) is 2; the 2 pairs of unilateral gear plates (31) are respectively positioned at two ends of the bilateral gear plates (32), and more than 1 pair of bilateral gear plates (32) are arranged between the 2 pairs of unilateral gear plates (31);
one end of the unilateral gear plate (31) is provided with a semicircular tooth (311), the center position of the semicircular tooth (311) on the unilateral gear plate (31) is provided with 1 first shaft mounting through hole (312), and the unilateral gear plate (31) and the center of the semicircular tooth (311) are at the same height and are also provided with 1 first shaft mounting through hole (312); semicircular teeth (311) are respectively machined at two ends of the double-side gear plate (32), and a first shaft mounting through hole (312) is formed in the center position of each semicircular tooth (311) on the double-side gear plate (32); the semicircular teeth (311) on the unilateral gear plate (31) are meshed and connected with the semicircular teeth (311) on one side of the bilateral gear plate (32); the adjacent 2 double-side gear plates (32) are also meshed and connected through semicircular teeth (311);
two semicircles (331) are processed at the two ends of the connecting sheet (33), and a second shaft mounting through hole (332) is formed in the center of each semicircle (331); the two sides of the semicircular teeth (311) on the unilateral gear plate (31) and the semicircular teeth (311) on the bilateral gear plate (32) are respectively provided with connecting sheets (33);
the long limiting ring (34) and the short limiting ring (35) are hollow cylinders, and third shaft mounting through holes (341) are formed in the long limiting ring (34) and the short limiting ring (35);
the two-way gear comprises a single-side gear plate (31), a long limiting ring (34) and another 1 single-side gear plate (31), wherein the single-side gear plate (31), the long limiting ring (34) and the other 1 single-side gear plate (31) are connected through shaft (36) clearance fit installation, and the single-side gear plate (31), the short limiting ring (35) and the other 1 single-side gear plate (31) are connected through shaft (36) clearance fit installation; the two-sided gear plates (32), the short limiting ring (35) and the other 1-sided gear plate (32) are connected through clearance fit installation of shafts (36); the same connecting piece (33) is arranged on a shaft (36) between the adjacent single-side gear plate (31) and the adjacent double-side gear plate (32) or between the adjacent double-side gear plate (32) and the adjacent double-side gear plate (32), namely, the shaft (36) sequentially passes through a second shaft installation through hole (332) on 1 connecting piece (33), a first shaft installation through hole (312) on the center of a circle of the 1 single-side gear plate (31), a second shaft installation through hole (332) on the 2 nd connecting piece (33), a third shaft installation through hole (341) on a short limiting ring (35), a second shaft installation through hole (332) on the 3 rd connecting piece (33), a first shaft installation through hole (312) on the center of a circle of the 2 nd single-side gear plate (31) and a second shaft installation through hole (332) on the 4 th connecting piece (33); the shaft (36) sequentially passes through a second shaft mounting through hole (332) on the 1 connecting sheet (33), a first shaft mounting through hole (312) on the 1 double-sided gear plate (32), a second shaft mounting through hole (332) on the 2 nd connecting sheet (33), a third shaft mounting through hole (341) on the short limiting ring (35), a second shaft mounting through hole (332) on the 3 rd connecting sheet (33), a first shaft mounting through hole (312) on the 2 nd double-sided gear plate (32) and a second shaft mounting through hole (332) on the 4 th connecting sheet (33); the shaft (36) sequentially passes through a first shaft installation through hole (312) in the non-circle center of the 1 single-side gear plate (31), a third shaft installation through hole (341) in the long limiting ring (34) and a first shaft installation through hole (312) in the circle center of the 2 nd single-side gear plate (31);
the wall surfaces of the shells (14) on the two sides of the first mounting cavity (11) on the core ball (1) are respectively provided with a first mounting surface (12) of a connecting sheet (33); a fourth shaft mounting through hole (13) is formed in the first mounting surface (12); the gear chain type connecting body (3) is arranged in the first mounting cavity (11), the first mounting surface (12) is attached to the connecting sheet (33), a shaft (36) is arranged in the fourth shaft mounting through hole (13) of the core ball (1), and the shaft (36) is in interference fit with the fourth shaft mounting through hole (13) of the core ball (1); an inclined surface (15) is formed on the shell (14) at the longitudinal center line position of the first installation cavity (11);
a second mounting cavity (21) is formed in one end, close to the core ball (1), of the core shaft (2), and second mounting surfaces (22) of connecting sheets (33) are respectively formed on the wall surfaces of the shells on two sides of the second mounting cavity (21); a fifth shaft mounting through hole (23) is formed in the second mounting surface (22); the gear chain type connector (3) is arranged in the second installation cavity (21), the second installation surface (22) is attached to the connecting sheet (33), a shaft (36) is arranged in the fifth shaft installation through hole (23) of the mandrel (2), and the shaft (36) is in interference fit with the fifth shaft installation through hole (23) of the mandrel (2);
the novel structure is characterized in that a hole (24) with internal threads is formed in the middle of the other end of the mandrel (2), an installation platform (25) is arranged on the outer surface of the mandrel (2), and an installation through hole (26) is formed in the installation platform (25).
2. A toothed mandrel for bending round pipe according to claim 1, characterized in that the long stop ring (34) and the single-sided gear plates (31) on both sides thereof are mounted in the second mounting cavity (21) of the mandrel (2) or the first mounting cavity (11) of the outermost core ball (1); the short limiting rings (35) and the double-sided gear plates (32) on the two sides of the short limiting rings are arranged in the first installation cavities (11) of the other core balls (1) except the outermost core ball (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811075821.6A CN109201807B (en) | 2018-09-14 | 2018-09-14 | Gear chain type core rod for bending and forming circular pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811075821.6A CN109201807B (en) | 2018-09-14 | 2018-09-14 | Gear chain type core rod for bending and forming circular pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109201807A CN109201807A (en) | 2019-01-15 |
| CN109201807B true CN109201807B (en) | 2023-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811075821.6A Active CN109201807B (en) | 2018-09-14 | 2018-09-14 | Gear chain type core rod for bending and forming circular pipe |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109332450A (en) * | 2018-11-02 | 2019-02-15 | 浙江工业大学 | A kind of bend pipe plug gear chain type connector |
| CN112453136A (en) * | 2020-09-22 | 2021-03-09 | 成都飞机工业（集团）有限责任公司 | Core rod for push bending forming of small-bending-radius guide pipe and using method thereof |
| CN114346026B (en) * | 2022-01-06 | 2023-05-09 | 南昌航空大学 | Pushing bending device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1929200A1 (en) * | 1969-06-09 | 1970-12-23 | Pines Engineering Co Inc | Pliable mandrel for bending pipes |
| IT993825B (en) * | 1973-08-30 | 1975-09-30 | Ind Meccanica Brevetti Pedrazz | ARTICULATED SPINDLE FOR BENDING PIPES |
| JPS52146759A (en) * | 1976-06-01 | 1977-12-06 | Setsuyou Koukan Kk | Core material for bending hollow material with slits |
| JP2005007438A (en) * | 2003-06-19 | 2005-01-13 | Opton Co Ltd | Mandrel for bending |
| CN201900161U (en) * | 2010-11-23 | 2011-07-20 | 凌云工业股份有限公司 | Core provided with compact core sections and used for arc processing of automobile bumper |
| CN102039336A (en) * | 2010-11-23 | 2011-05-04 | 凌云工业股份有限公司 | Core for arcing and processing of bumper |
| CN102284574A (en) * | 2011-08-18 | 2011-12-21 | 凌云工业股份有限公司 | Slug for causing car bumper with small bend radius to be arc |
| CN209520229U (en) * | 2018-09-14 | 2019-10-22 | 浙江万丰金马逊科技有限公司 | A kind of round tube bending forming gear chain type plug |
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