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CN-122007222-A - Pipe bending machine and pipe bending method

CN122007222ACN 122007222 ACN122007222 ACN 122007222ACN-122007222-A

Abstract

A pipe bending machine and a bending method belong to the technical field of bending machines, the pipe bending machine comprises a machine body and a rotary motion mechanism, the rotary motion mechanism is connected with a bent pipe eccentric die and a clamping die mechanism, the bent pipe eccentric die and the clamping die mechanism are arranged oppositely, an auxiliary deducing die mechanism is arranged on one side of the clamping die mechanism, the clamping die mechanism and the auxiliary deducing die mechanism are sequentially arranged along the length direction of the machine body, the bent pipe eccentric die comprises an eccentric die body, the eccentric die body is an eccentric fan-shaped disc, the center position of the eccentric die body is deviated from the rotation center of the eccentric die body, and an upper die and a lower die are arranged on the upper side and the lower side of the eccentric die body oppositely. The eccentric wheel die main body arranged eccentrically enables the pipe to generate translational displacement along the bending radius direction when the pipe is bent, and is suitable for the stable forming requirement of large-pipe-diameter carbon pipes and large-section special-shaped materials, the positive thrust can be manufactured through the active axial boosting effect of the auxiliary derivation die mechanism, and the problem of wall thickness reduction caused by stretching outside the pipe is effectively solved.

Inventors

  • HOU JINQIANG
  • SONG WEI

Assignees

  • 山东创新精密科技有限公司

Dates

Publication Date
20260512
Application Date
20260325

Claims (10)

  1. 1. The pipe bending machine comprises a machine body (1), wherein a machine head of the machine body (1) is provided with a rotary motion mechanism (2), and is characterized in that the rotary motion mechanism (2) is connected with an elbow eccentric die (3) and a clamping die mechanism (4), the elbow eccentric die (3) and the clamping die mechanism (4) are oppositely arranged, one side of the clamping die mechanism (4) is provided with an auxiliary deducing die mechanism (5), the clamping die mechanism (4) and the auxiliary deducing die mechanism (5) are sequentially arranged along the length direction of the machine body (1), and the auxiliary deducing die mechanism (5) is used for actively and axially boosting a workpiece (7) to manufacture forward thrust and forcedly slowing down the wall thickness reduction rate; The bent pipe eccentric die (3) comprises an eccentric wheel die main body (31), the eccentric wheel die main body (31) is an eccentric sector disc, the center position of the eccentric wheel die main body (31) deviates from the rotation center of the eccentric wheel die main body, an upper wheel die (32) and a lower wheel die (33) are arranged on the upper side and the lower side of the eccentric wheel die main body (31) relatively, and the upper wheel die (32) and the lower wheel die (33) are used for clamping a workpiece (7).
  2. 2. The pipe bending machine according to claim 1, characterized in that the lower wheel die (33) is fixedly connected with the eccentric wheel die main body (31), a plurality of guide shafts (35) are fixedly arranged on the upper surface of the eccentric wheel die main body (31), the upper wheel die (32) is slidably connected with the guide shafts (35), an opening and closing positioning block (36) is fixedly arranged at the top of the guide shafts (35), a pressing mechanism (37) is fixedly arranged on the eccentric wheel die main body (31), and the pressing mechanism (37) is used for limiting the pressing of the upper wheel die (32).
  3. 3. The pipe bending machine according to claim 2, wherein the pressing mechanism (37) comprises a support (371) fixedly mounted on the upper surface of the eccentric wheel die main body (31), a pressing oil cylinder (372) is fixedly mounted on the support (371), a pressing block (375) is slidably arranged on the support (371), the pressing block (375) is fixedly connected with the telescopic end of the pressing oil cylinder (372), the pressing block (375) is located above the upper wheel die (32), and the top end of the pressing block (375) is hinged with the top end of the support (371) sequentially through a second connecting rod (374) and a first connecting rod (373).
  4. 4. Pipe bending machine according to claim 2, characterized in that the lower surface of the upper wheel die (32) and the upper surface of the lower wheel die (33) are fixedly provided with a flexible protective layer (34).
  5. 5. A pipe bending machine according to claim 3, characterized in that the clamping die mechanism (4) comprises a bending arm (41), a first sliding rail (44) is fixedly arranged on the upper surface of the bending arm (41), a first sliding seat (47) is arranged on the first sliding rail (44) in a sliding manner, the first sliding seat (47) is connected with the clamping cylinder (42), and the profiling clamping die (43) is arranged on the first sliding seat (47).
  6. 6. The pipe bending machine according to claim 5, characterized in that the auxiliary deriving die mechanism (5) comprises a second sliding rail (54) fixedly arranged on the machine body (1), the second sliding rail (54) extends towards the direction of the pipe bending eccentric die (3), a second sliding seat (55) is arranged on the second sliding rail (54) in a sliding mode, the second sliding seat (55) is connected with a second servo motor (51) through a first screw rod (53), a third sliding rail (56) and a third servo motor (57) are fixedly arranged on the second sliding seat (55), the third sliding rail (56) extends towards the direction of the clamping die mechanism (4), a profiling guiding die (59) is arranged on the third sliding rail (56) in a sliding mode, and the profiling guiding die (59) is connected with the third servo motor (57) through a second screw rod (58).
  7. 7. The pipe bending machine according to claim 5, characterized in that a mandrel supporting mechanism (6) is arranged at the tail of the machine body (1), the mandrel supporting mechanism (6) comprises a core pulling oil cylinder (65), a first pull rod (67) is connected to the telescopic end of the core pulling oil cylinder (65), the first pull rod (67) is connected with a plurality of second pull rods (610) through a distributor (68), the first pull rod (67) is parallel to the axes of all the second pull rods (610), each second pull rod (610) is correspondingly connected with a mandrel, and a retaining seat (69) for preventing the second pull rods (610) from being misplaced is arranged on the machine body (1).
  8. 8. The pipe bending machine according to claim 5, wherein a carrier roller (8) is rotatably arranged at the machine head, and an end positioning mechanism (9) is fixedly arranged at the front side of the carrier roller (8).
  9. 9. A method of winding a tube as claimed in any one of claims 5 to 8, comprising: Placing the workpiece (7) between the upper wheel die (32) and the lower wheel die (33) so that the end of the workpiece (7) is abutted against the end positioning mechanism (9); After the workpiece (7) is placed in place, the clamping oil cylinder (42) acts to enable the profiling clamping die (43) to be attached to the outer side of the workpiece (7) and push the inner side of the workpiece (7) to be attached to the side wall of the eccentric wheel die main body (31), the pressing oil cylinder (372) drives the pressing block (375) to move downwards, and the upper wheel die (32) and the lower wheel die (33) clamp and fix the workpiece (7); after the elbow eccentric die (3) and the clamping die mechanism (4) clamp the workpiece (7), the second servo motor (51) acts to enable the profiling guide die (59) to be attached to the outer cambered surface of the workpiece (7), and then the core rod is installed in the corresponding cavity; and starting the rotary motion mechanism (2), synchronously rotating the bent pipe eccentric die (3) and the clamping die mechanism (4) around the shaft, synchronously starting the third servo motor (57), and driving the profiling guide die (59) to be actively pushed along the third sliding rail (56) towards the clamping die mechanism (4).
  10. 10. The winding method according to claim 9, characterized in that after the winding of the workpiece (7) is completed, the third servo motor (57) is stopped, the profiling guide die (59) and the profiling clamp die (43) are sequentially separated from the workpiece (7), and finally the pressing block (375) removes the pressing of the upper wheel die (32), releases the workpiece (7), and removes the workpiece (7) after the winding is completed.

Description

Pipe bending machine and pipe bending method Technical Field The invention relates to the technical field of bending machines, in particular to a pipe bending machine and a pipe bending method. Background The pipe bending machine is core equipment for realizing high-precision bending and forming of pipes, is mainly used for bending and forming tasks of round pipes, square pipes, hollow pipes, solid pipes, special pipes and the like, and is widely applied to the fields of aerospace, automobiles, engineering machinery and the like, wherein materials comprise carbon steel pipes, stainless steel, aluminum profiles, high-temperature alloys and other nonferrous metal pipes. The existing pipe bending machine is generally provided with a bending mechanism and a bending die, the bending mechanism and the bending die are arranged oppositely, clamping of the pipe is achieved through the bending mechanism and the bending die, the bending mechanism and the bending die synchronously rotate around a shaft to achieve bending of the pipe, and meanwhile a mandrel mechanism is further arranged, and the mandrel is inserted into a cavity of a workpiece to prevent the cavity from collapsing in the bending process of the workpiece. However, the existing pipe bending machine is single in rotation around a shaft, namely, a bending mechanism and a bending die rotate around a rotating shaft in a circumferential mode, the pipe can only perform pure bending motion, translational displacement along the bending radius direction is avoided, stable forming of large-diameter carbon pipes and large-section special-shaped materials cannot be achieved, the outer side of the pipe is tensioned and the inner side of the pipe is pressed during bending, excessive stretching and thinning of the outer side and unstable wrinkling of the inner side cannot be caused according to deformation dynamic compensation materials, in addition, most of existing die cavities are fixed, feeding and discharging operation difficulty is high, hard stretching forming is needed during pipe bending, and surface strain and scratch are easily caused due to friction with the die. Disclosure of Invention The invention provides a pipe bending machine and a bending method, which aims to solve the technical problems that the existing pipe bending machine in the background technology is single in rotation around a shaft, namely a bending mechanism and a bending die do circumferential rotation around a rotating shaft, the pipe can only do pure bending motion, translational displacement along the bending radius direction is avoided, and stable forming of large-diameter carbon pipes and large-section special-shaped materials cannot be realized. The technical scheme of the invention is as follows: The invention provides a pipe bending machine, which comprises a machine body, wherein a machine head of the machine body is provided with a rotary motion mechanism, the rotary motion mechanism is connected with a bent pipe eccentric die and a clamping die mechanism, the bent pipe eccentric die and the clamping die mechanism are arranged oppositely, one side of the clamping die mechanism is provided with an auxiliary deriving die mechanism, the clamping die mechanism and the auxiliary deriving die mechanism are sequentially arranged along the length direction of the machine body, the auxiliary deriving die mechanism is used for actively and axially boosting a workpiece to manufacture forward thrust force and forcedly slowing down the wall thickness thinning rate, the bent pipe eccentric die comprises an eccentric die main body, the eccentric die main body is an eccentric sector disc, the center position of the eccentric die main body deviates from the rotation center of the eccentric die main body, and an upper die and a lower die are arranged on the upper side and the lower side of the eccentric die main body oppositely and are used for clamping the workpiece. The rotary motion mechanism drives the bent pipe eccentric die and the clamping die mechanism to synchronously rotate, so that the pipe bending forming is realized, the eccentric wheel die main body eccentrically arranged enables the pipe to generate translational displacement along the bending radius direction during pipe bending, the limit of single winding shaft rotation is broken, the stable forming requirements of large-diameter carbon pipes and large-section special-shaped materials are adapted, the clamping structures of the upper wheel die and the lower wheel die can reliably fix the pipe, the position stability of the pipe in the pipe bending process is ensured, the positive thrust can be manufactured through the active axial boosting effect of the auxiliary deriving die mechanism, the problem of wall thickness thinning caused by stretching outside the pipe is effectively solved, the condition of compressive instability inside the pipe is improved, the dynamic deformation compensation of the material in the pipe bending pro