CN108480440A - A kind of free curve bending machine of tube diameter variable - Google Patents

Abstract

The invention discloses a free curve pipe bending machine with variable pipe diameter. It includes the bending pipe pushing mechanism, guiding mechanism and bending die mechanism arranged in sequence along the pipe fitting transportation direction. The pipe fittings run through the bending pipe pushing mechanism, guiding mechanism and bending die mechanism; The threaded rings are fixed inside the end, there is a gap between the threaded rings at both ends and a magnet ring is set in the gap, the steel end caps are respectively threaded in the two threaded rings, and there is a bending die between the two steel end caps Ring, the outer peripheral side of the bending die ring is close to the surface of the steel end cover, and the pipe runs through the center of the bending die ring; The elastic bands pass through the middle of themselves and are connected in series. The invention realizes the function that only one set of adjustable molds can be used for three-dimensional free bending and forming for pipe fittings with different pipe diameters, which saves manufacturing cost and improves manufacturing efficiency.

Description

A free curve pipe bending machine with variable pipe diameter

technical field

The invention relates to a free-curve pipe bender with variable pipe diameter, in particular to a free-curve pipe bender with variable pipe diameter. The device is used for three-dimensional free-form bending of pipe fittings.

Background technique

The three-dimensional free bending forming process is an emerging flexible forming process in the field of metal plastic forming, which is used to realize the precise die-free forming of pipe fittings under the condition of continuously variable curvature. Due to the different diameters of oil and gas pipelines inside the aircraft engine and the complex spatial layout structure, the three-dimensional free bending forming process has great application prospects in this field.

The existing free-curve pipe bender improves the disadvantages of traditional pipe benders that need to replace the bending die to achieve variable bending radius, and meets the demand for variable curvature bending of pipe fittings with the same diameter in large quantities. However, for the single-piece and small-batch manufacturing of pipe fittings with different diameters in aviation manufacturing and other fields, it is still necessary to customize the corresponding pipe bending machine modules of different specifications.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a free-curve pipe bender with variable pipe diameter.

The technical scheme adopted in the present invention is:

The invention comprises a bending pipe pushing mechanism, a guiding mechanism and a bending die mechanism installed on the frame arranged in sequence along the pipe fitting transport direction, the frame is arranged horizontally, and the pipe fittings run through the bending pipe pushing mechanism, guiding mechanism and bending die mechanism;

The bending die mechanism includes a bending die base, a magnet ring, a threaded ring, a steel end cover, a bending die sheet and an elastic belt; a large horizontal hole is arranged on the bending die base, and a screw thread is fixedly installed at both ends of the large horizontal hole. There is a gap between the two threaded rings at both ends and a magnet ring is set in the gap. The two threaded rings are respectively threaded with respective steel end caps, and there is a bending die between the two steel end caps. Ring, the outer peripheral side of the bending die ring is close to the surface of the steel end cover, and the pipe runs through the center of the bending die ring; The elastic bands pass through the middle of themselves and are connected in series.

The invention drives the two steel end caps to separate or move closer by rotating the steel end caps set in the two threaded rings, and adjusts the gap between the two steel end caps; Reduce the number of bending pieces in the bending ring, reassemble the bending ring so that the outer peripheral side of the bending ring is close to the surface of the steel end cover, and at the same time expand or reduce the space surrounded by the inner ends of each bending piece in the bending ring aperture size.

In the present invention, the holes surrounded by the inner ends of the bending die rings along the radial direction are used as free curved pipe holes through which the pipe fittings pass. By increasing or reducing the number of bending dies in the bending die ring, the bending die ring The reassembly drives the free curve elbow hole to adjust the variable diameter, and then realizes the variable pipe diameter.

Each bending die piece is provided with chamfers along the two corners of the radially outer end side of the pipe fitting. The opposite end faces of the two steel end caps are set as wedge-shaped surfaces matching the chamfers. The wedge-shaped surface of the end cap.

Each bending die sheet is provided with a through groove for the elastic band to pass through.

The threaded ring is made of magnetic material, and the magnet ring is connected to the threaded ring through magnetic force.

The guide mechanism is located between the bending pipe pushing mechanism and the bending die mechanism, and supports and guides the pipe fittings pushed by the bending pipe pushing mechanism.

The guide mechanism includes two guide bases, a small bevel gear and a large bevel gear, and a large bevel gear is installed inside the two guide bases, and the two large bevel gears of the two guide bases are arranged oppositely and are facing There is a spiral groove on the end surface, and multiple guide blocks are connected between the two guide bases. The pipe passes through the two guide bases and the through hole opened in the center of the large bevel gear. The multiple guide blocks are evenly spaced along the circumference of the pipe. The two ends of the guide block are provided with rectangular teeth that match the spiral groove, and the rectangular teeth are embedded in the spiral groove, so that the two ends of the guide block are connected to the large bevel gear; the guide block is provided with an annular inner cavity facing the side of the pipe, A steel ball is tightly installed in the annular inner chamber, and a strip-shaped through groove is opened on the guide block toward the side of the pipe fitting, and the steel ball partially passes through the strip-shaped through groove and is connected to the pipe fitting.

The guide base is provided with a small bevel gear, and the small bevel gear is meshed with the large bevel gear. The rotation of the small bevel gear drives the large bevel gear to rotate, and then drives the guide block along the The pipe moves radially.

The bent pipe pushing mechanism includes claws, a chuck base, a sprocket, a driving shaft, a chain, a driven shaft and a bearing with seat; The connection is fixed by screws, and the sprockets at both ends of the chain are respectively set on the driving shaft and the driven shaft, and both the driving shaft and the driven shaft are installed on the frame through bearings with seats.

The driving shaft is connected to a motor, and the motor drives the driving shaft to rotate, and then drives the chuck base and the pipe fitting clamped by the jaws to move horizontally through the chain drive.

The frame is provided with a sliding bar rail, and the bottom of the chuck base is provided with a sliding bar groove, and the sliding bar groove is embedded in the sliding bar rail to form a sliding pair.

The invention is suitable for three-dimensional free bending forming of pipe fittings. Connect the sliding bar groove at the bottom of the six-jaw chuck with the sliding bar of the frame, and fix it on the chain through screws, and fix the guide base on the frame through bolts. On the high-degree motion platform, the motor drives the sprocket to rotate, and drives the six-jaw chuck to feed in the axial direction of the pipe, and the motor drives the guide block and the claws of the six-jaw chuck to feed in the radial direction of the pipe. The bending die pieces are connected in series by elastic bands to form a bending die ring, and the two sides of the bending die ring are attached to the steel end cover under the action of magnetic force.

The beneficial effects of the present invention are:

Using the present invention, by changing the number of bending die pieces and adjusting the relative screwing position of the steel end cap and the threaded ring, the function of changing the diameter of the bending die is realized, and the radial feeding of the guide block and the claw respectively realizes the guiding mechanism and The variable diameter function of the propulsion mechanism.

The whole structure of the present invention realizes the function that only one set of adjustable molds can be used for three-dimensional free bending and forming for pipe fittings with different pipe diameters, which saves manufacturing cost and improves manufacturing efficiency.

Description of drawings

Fig. 1 is the schematic diagram of device of the present invention;

Fig. 2 is a side sectional view of the structure of the bending die mechanism of the present invention;

Fig. 3 is the front view of bending die mechanism of the present invention;

Fig. 4 is a state diagram of the variable diameter adjustment of the bending die mechanism of the present invention;

Fig. 5 is a sectional view of the guide block structure of the present invention;

Fig. 6 is a structural diagram of the radially inner end surface of the guide block of the present invention;

Fig. 7 is a partially enlarged cross-sectional view of the guiding mechanism structure of the present invention.

In the figure, bending die base 1, fastening screw 2, magnet ring 3, threaded ring 4, steel end cap 5, bending die piece 6, elastic band 7, guide base 8, small bevel gear 9, large bevel gear 10, Bolt 11, frame 12, guide block 13, steel ball 14, claw 15, chuck base 16, sprocket wheel 17, driving shaft 18, chain 19, screw 20, driven shaft 21, belt seat bearing 22.

Detailed ways

The present invention will be further described below in conjunction with drawings and embodiments.

As shown in Fig. 1, the specific implementation of the present invention includes the bending pipe pushing mechanism, guide mechanism and bending die mechanism installed on the frame 12 arranged in sequence along the transportation direction of the pipe fittings, the frame 12 is arranged horizontally, and the pipe fittings run through the bending pipe pushing mechanism , guiding mechanism and bending die mechanism; the pipe fittings are in contact with the claws 15, steel balls 14, and bending dies 6 in sequence.

As shown in Figures 2 and 3, the bending die mechanism includes a bending die base 1, a magnet ring 3, a threaded ring 4, a steel end cover 5, a bending die sheet 6 and an elastic band 7; A threaded ring 4 is fixedly installed in the two ends of the horizontal large hole through fastening screws 2. There is a gap between the two threaded rings 4 at both ends and a magnet ring 3 is arranged in the gap. The two threaded rings 4 pass through the The thread sets have respective steel end caps 5, and a bending die ring is arranged between the two steel end caps 5, and the outer peripheral side of the bending die ring is closely attached to the surface of the steel end cap 5, and the pipe fitting runs through the center of the bending die ring; The die ring is mainly composed of a plurality of bending dies 6 arranged in a circle around the circumference of the pipe fitting, and the plurality of bending dies 6 are closely arranged in a circle around the circumference of the pipe fitting, and the plurality of bending dies 6 pass through itself through the elastic band 7 The middle part is connected in series to form a structure similar to a ring string of beads. The number of bending die pieces 6 makes the bending die ring formed by connecting the elastic bands 7 in series form a stable structure without looseness.

Each bending die piece 6 is provided with chamfers along the two corners of the radially outer end side of the pipe fitting, and the opposite end faces of the two steel end caps 5 are set as wedge-shaped surfaces matching the chamfering, and the chamfered sides of the bending die piece 6 are close to each other. Fit the wedge-shaped surface of the steel end cap 5. Each bending die piece 6 is arranged as a circular arc along the radially inner end side of the pipe. Each bending die sheet 6 is provided with a through groove for the elastic belt 7 to pass through.

The threaded ring 4 is made of magnetic material, and the magnet ring 3 is connected with the threaded ring 4 by magnetic force.

The present invention arranges the magnet ring 3 between the threaded rings 4, which can prevent the bending die ring from toppling over during the installation process, keep the center line of the bending die ring parallel to the center line of the steel end cap 5, facilitate the rotation of the steel end cap 5, and Auxiliary position-limiting effect, after the installation is completed, the chamfered edge of each bending die sheet 6 is close to the wedge-shaped surface of the steel end cover 5 under the action of magnetic force.

The guiding mechanism is located between the bending pipe pushing mechanism and the bending die mechanism, and supports and guides the pipe fittings pushed by the bending pipe pushing mechanism. As shown in Figure 7, the guide mechanism includes two guide bases 8, a small bevel gear 9 and a large bevel gear 10, the two guide bases 8 are fixed on the frame 12 by bolts 11, and the inside of the two guide bases 8 are installed There is a large bevel gear 10, and the two large bevel gears 10 of the two guide bases 8 are arranged oppositely and have spiral grooves on the opposite end faces. A plurality of guide blocks 13 are connected between them, and the pipe passes through two guide bases 8 and a through hole provided in the center of the large bevel gear 10. A plurality of guide blocks 13 are evenly spaced along the circumference of the pipe; the two ends of the guide block 13 are provided with The rectangular teeth matched with the spiral groove, the rectangular teeth are embedded in the spiral groove, so that the two ends of the guide block 13 are connected to the large bevel gear 10; There is a ring-shaped inner cavity, and steel balls 14 are tightly installed in the ring-shaped inner cavity. The guide block 13 has a strip-shaped through groove facing the side of the pipe fitting, and the steel ball 14 partially passes through the strip-shaped through groove and is connected to the pipe fitting. The annular inner cavity is in the form of a waist structure, and the straight line section of the waist structure is parallel to the pipe fitting.

The end surface of the guide base 8 is provided with a plurality of bar-shaped grooves arranged at intervals in the circumferential direction, and each bar-shaped groove is arranged radially. Both ends of the guide block 13 are embedded in the bar-shaped grooves of the guide base 8 to form a moving guide. Both sides of the guide block 13 near both ends are provided with strip grooves, so that the ends of the guide block 13 form convex strip structures on both sides, and the convex strip structures on both sides are embedded in the strip grooves.

The guide base 8 is provided with a small bevel gear 9, the small bevel gear 9 is meshed with the large bevel gear 10, and the rotation of the small bevel gear 9 drives the large bevel gear 10 to rotate, and then the transmission structure formed by the spiral groove and the saw teeth of the guide block 13 Drive the guide block 13 to move radially along the pipe.

As shown in Figure 1, the bent pipe pushing mechanism includes claws 15, chuck base 16, sprocket 17, driving shaft 18, chain 19, driven shaft 21 and belt seat bearing 22; chuck base 16 is equipped with claws 15 , the jaws 15 clamp the pipe, the chuck base 16 and the chain 19 are fixedly connected by screws 20, the sprockets 17 at both ends of the chain 19 are respectively set on the driving shaft 18 and the driven shaft 21, and the driving shaft 18 and the driven shaft 21 are both It is installed on the frame 12 through the bearing unit 22 .

The driving shaft 18 is connected to the motor, and the motor drives the driving shaft 18 to rotate, and then drives the chuck base 16 and the pipe fitting clamped by the jaws 15 to move horizontally through the chain drive.

The frame 12 is provided with a sliding bar rail, and the bottom of the chuck base 16 is provided with a sliding bar groove, and the sliding bar groove is embedded in the sliding bar rail to form a sliding pair to guide the movement of the chuck base 16.

The implementation work process of the present invention is as follows:

1) As shown in Figure 4, according to the outer diameter of the pipe fitting to be bent, turn the steel end cap 5 set in the two threaded rings 4, adjust the screwing position of the steel end cap 5 and the threaded ring 4, and drive the two Two steel end caps 5 are separated or moved closer together, adjust the gap between the two steel end caps 5, change the number of bending die pieces 6 in the bending die ring, reassemble the bending die ring so that the outer peripheral side of the bending die ring is close to the The surface of the steel end cover 5 is to make the chamfered edge of each bending die piece 6 close to the wedge-shaped surface of the steel end cover 5 . At the same time, the size of the apertures surrounded by the inner ends of each bending die piece 6 in the bending die ring is changed, and it is suitable for the outer diameter of the pipe fitting to be bent, and the variable diameter adjustment is completed.

2) The guide mechanism works, the small bevel gear 9 connected to the two guide bases 8 is synchronously driven by two motors, and the large bevel gear 17 is driven to rotate, thereby driving the guide block 13 embedded in the helical groove of the large bevel gear 17 to advance radially along the pipe. To, pressed against the surface of the pipe.

3) The bending pipe pushing mechanism works, the motor drives the drive shaft 18 to rotate, and drives the chuck base 16 to feed along the pipe axial direction, and the motor drives the small bevel gear 9 connected to the chuck base 16 to drive the large bevel gear 17 to rotate , thereby driving the claw 15 embedded in the helical groove of the large bevel gear 17 to feed radially along the pipe.

4) While the guiding mechanism and the pipe bending pushing mechanism are working, the bending die mechanism is fixed on the six-degree-of-freedom motion platform, and the bending die mechanism is driven by the six-degree-of-freedom motion platform to move, so that the pipe fittings can be bent as required.

Claims (10)

1. A free-curved pipe bender with variable pipe diameter, characterized in that: it comprises a bending pipe pushing mechanism and a guide mechanism and a bending die mechanism arranged on the frame (12) along the transport direction of pipe fittings successively, and the frame (12) Arranged horizontally, the pipe fittings run through the bending pipe pushing mechanism, guiding mechanism and bending die mechanism; the bending die mechanism includes a bending die base (1), a magnet ring (3), a threaded ring (4), a steel end Cover (5), bending die sheet (6) and elastic band (7); the bending die base (1) has a large horizontal hole, and a threaded ring (4) is fixedly installed in the two ends of the horizontal large hole, and the two ends of the two ends There is a gap between the two threaded rings (4) and a magnet ring (3) is arranged in the gap. The two threaded rings (4) are respectively provided with respective steel end caps (5) through threaded sleeves. The two steel end caps There is a bending ring between the covers (5), the outer peripheral side of the bending ring is close to the surface of the steel end cover (5), and the pipe runs through the center of the bending ring; the bending ring is mainly arranged in a circle along the circumference of the pipe A plurality of bending mold pieces (6) are formed, and the plurality of bending mold pieces (6) are connected in series after passing through the middle part of the elastic belt (7). 2. A free curve pipe bender with variable pipe diameter according to claim 1, characterized in that: each bending die piece (6) is provided with chamfers along the two corners of the radially outer end side of the pipe fitting, two The opposite end face of the steel end cover (5) is set as a wedge-shaped surface matched with the chamfering, and the chamfered edge of the bending die sheet (6) is closely attached to the wedge-shaped surface of the steel end cover (5). 3. A free curve pipe bender with variable pipe diameter according to claim 1, characterized in that: each bending die piece (6) is provided with a through groove for the elastic band (7) to pass through. 4. A free curve pipe bender with variable pipe diameter according to claim 1, characterized in that: the threaded ring (4) is made of magnetic material, and the magnet ring (3) is connected with the threaded ring (4) by magnetic force. ) connection function. 5. A free-curved pipe bender with variable pipe diameter according to claim 1, characterized in that: the guide mechanism is located between the bending pipe pushing mechanism and the bending die mechanism, and pushes the bending pipe pushing mechanism The pipe fittings are supported and guided. 6. A free curve pipe bender with variable pipe diameter according to claim 1 or 5, characterized in that: the guide mechanism includes two guide bases (8), a small bevel gear (9) and a large Bevel gear (10), a large bevel gear (10) is installed inside the two guide bases (8), and the two large bevel gears (10) of the two guide bases (8) are arranged oppositely and on the opposite end faces There is a spiral groove on the top, and there are multiple guide blocks (13) connected between the two guide bases (8). A plurality of guide blocks (13) are evenly distributed along the circumferential direction of the pipe; the two ends of the guide block (13) are provided with rectangular teeth matching with the spiral groove, and the rectangular teeth are embedded in the spiral groove, so that the two ends of the guide block (13) The end is connected to the large bevel gear (10); the guide block (13) is provided with an annular inner cavity facing the side of the pipe fitting, and a steel ball (14) is tightly installed in the annular inner cavity, and the guide block (13) is provided with a strip shape facing the side of the pipe fitting. Through the groove, the steel ball (14) partially passes through the strip through groove and is connected to the pipe fitting. 7. A free curve pipe bender with variable pipe diameter according to claim 1, characterized in that: the guide base (8) is provided with a small bevel gear (9), and the small bevel gear (9) Engaged with the large bevel gear (10), the rotation of the small bevel gear (9) drives the large bevel gear (10) to rotate, and then drives the guide block (13) along the The pipe moves radially. 8. A free-curve pipe bender with variable pipe diameter according to claim 1, characterized in that: the pipe bending pushing mechanism includes a claw (15), a chuck base (16), a sprocket ( 17), driving shaft (18), chain (19), driven shaft (21) and seated bearing (22); the chuck base (16) is equipped with claws (15), and the claws (15) clamp pipe fittings , the chuck base (16) and the chain (19) are fixedly connected by screws (20), and the sprockets (17) at both ends of the chain (19) are respectively set on the driving shaft (18) and the driven shaft (21), and the driving shaft (18) and driven shaft (21) are all installed on frame (12) by band seat bearing (22). 9. A free curve pipe bender with variable pipe diameter according to claim 8, characterized in that: the drive shaft (18) is connected to a motor, and the drive shaft (18) is driven by the motor to rotate, and then through the chain The transmission drives the chuck base (16) and the pipe fitting clamped by the jaws (15) to move horizontally. 10. A free curve pipe bender with variable pipe diameter according to claim 8, characterized in that: the frame (12) is provided with sliding rails, and the bottom of the chuck base (16) is provided with The sliding bar groove is embedded in the sliding bar rail to form a sliding pair.