CN108480440B - A kind of free curve bending machine of tube diameter variable - Google Patents

Abstract

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

Description

A free-curve pipe bender 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, which 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 achieve precise die-free forming of pipe fittings under the condition of continuously variable curvature. Due to the different diameters of the oil and gas pipelines inside the aircraft engine, and the complex spatial layout and structure, the three-dimensional free bending forming process has great application prospects in this field.

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

SUMMARY 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 includes a bending pipe pushing mechanism, a guiding mechanism and a bending die mechanism installed on a frame, which are arranged in sequence along the transport direction of the pipe fittings.

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 band; the bending die base is provided with a horizontal large hole, and two ends of the horizontal large hole are respectively fixed and installed. Threaded ring, there is a gap between the two threaded rings at both ends and a magnet ring is arranged in the gap, the two threaded rings are respectively fitted with their own steel end caps through threads, and there is a bend between the two steel end caps. Die ring, the outer peripheral side of the bending die ring is close to the surface of the steel end cover, and the pipe fittings run through the center of the bending die ring; The pieces are connected in series after passing through the middle of the elastic band.

The invention adjusts the gap between the two steel end caps by rotating the steel end caps sheathed in the two threaded rings to drive the two steel end caps to separate or move closer; Reduce the number of bending die 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 surface of the steel end cover, and at the same time enlarge or reduce the inner end of each bending die in the bending die ring. Aperture size.

In the present invention, the hole surrounded by the radially inner end of the bending die of the bending die ring is used as a free curve bend pipe through which the pipe fittings pass. By increasing or reducing the number of the bending die in the bending die ring Reassembly drives the free-curve elbow hole for variable diameter adjustment, thereby realizing variable pipe diameter.

Each bending die is provided with chamfers along the two corners of the radially outer end side of the pipe, the opposite end faces of the two steel end caps are set as wedge surfaces matched with the chamfers, and the chamfered edges of the bending die are closely attached to the steel the wedge-shaped surface of the end cap.

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

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

The guiding mechanism is located between the curved pipe pushing mechanism and the bending die mechanism, and supports and guides the pipe piece pushed by the curved pipe pushing mechanism.

The guide mechanism includes two guide bases, a small bevel gear and a large bevel gear, a large bevel gear is installed inside the two guide bases, and the two large bevel gears of the two guide bases are arranged opposite and opposite each other. There is a spiral groove on the end face, a plurality of guide blocks are connected between the two guide bases, the pipe fittings pass through the two guide bases and the through hole opened in the center of the large bevel gear, and the plurality of guide blocks are evenly spaced along the circumference of the pipe fittings; The two ends of the guide block are provided with rectangular teeth matched with the helical groove, and the rectangular teeth are embedded in the helical groove, so that the two ends of the guide block are connected to the large bevel gear; Steel balls are tightly installed in the inner cavity, the guide block is provided with a strip-shaped through groove toward the side of the pipe fitting, and the steel ball partially penetrates the strip-shaped through groove and is connected to the pipe fitting.

The guide base is provided with a small bevel gear, the small bevel gear is meshed with the large bevel gear, and the rotation of the small bevel gear drives the large bevel gear to rotate, and then drives the guide block through the transmission structure formed by the spiral groove and the rectangular teeth of the guide block. Move radially along the tube.

The bending pipe pushing mechanism includes a jaw, a chuck base, a sprocket, a driving shaft, a chain, a driven shaft and a bearing with a seat; the chuck base is equipped with a jaw, the jaw is clamped with a pipe fitting, the chuck base and the chain The sprockets at both ends of the chain are respectively sleeved on the driving shaft and the driven shaft, and the driving shaft and the driven shaft are both installed on the frame through the bearing with seat.

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

The frame is provided with a sliding rail, the bottom of the chuck base is provided with a sliding groove, and the sliding groove is embedded in the sliding 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 by screws. The guide base is fixed on the frame by bolts. The bending die mechanism is a variable diameter bending die and is fixed on the six free On the high-speed 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 six-jaw chuck to feed radially along the pipe. The bending die is 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 cap under the action of magnetic force.

The beneficial effects of the present invention are:

Using the present invention, the diameter-reducing function of the bending die is realized by changing the number of the bending die pieces and adjusting the relative screwing position of the steel end cover and the threaded ring. The reducing function of the propulsion mechanism.

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

Description of drawings

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

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

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

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

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

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

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

In the figure, bending die base 1, fastening screw 2, magnet ring 3, threaded ring 4, steel end cover 5, bending die 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, jaw 15, chuck base 16, sprocket 17, driving shaft 18, chain 19, screw 20, driven shaft 21, bearing 22 with seat.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

As shown in FIG. 1 , the specific implementation of the present invention includes a bending pipe pushing mechanism, a guiding mechanism and a bending die mechanism installed on the frame 12 arranged in sequence along the transport direction of the pipe fittings, the frame 12 is arranged horizontally, and the pipe fittings penetrate through the bending pipe pushing mechanism , guide mechanism and bending die mechanism; the pipe fittings are in contact with the jaws 15, the steel balls 14, and the bending die 6 in sequence according to the feeding 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 cap 5, a bending die sheet 6 and an elastic band 7; The two ends of the horizontal large hole are respectively fixed and installed with a threaded ring 4 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 are respectively The respective steel end caps 5 are fitted through threads, a bending die ring is arranged between the two steel end caps 5, the outer peripheral side of the bending die ring is closely attached to the surface of the steel end cap 5, and the pipe fittings penetrate through the center of the bending die ring; The bending die ring is mainly composed of a plurality of bending die pieces 6 arranged in a circle around the circumference of the pipe fitting, the plurality of bending die pieces 6 are closely arranged around the circumference of the pipe fitting, and the plurality of bending die pieces 6 are passed through the elastic belt 7 The middle part of itself is connected in series to form a structure similar to a ring-shaped bead. The number of the curved die pieces 6 makes the curved die ring formed by the elastic band 7 connected in series to form a stable structure without loosening.

Each curved die 6 is provided with chamfers along the two corners of the radially outer end side of the pipe. The opposite end faces of the two steel end caps 5 are set as wedge surfaces matched with the chamfers, and the chamfered edges of the curved die 6 are in close contact with each other. Fit the wedge surface of the steel end cap 5. Each bending die 6 is formed as a circular arc along the radially inner end side of the pipe. Each curved die 6 is provided with a through slot for the elastic band 7 to pass through.

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

In the present invention, the magnet ring 3 is arranged between the threaded rings 4, which can prevent the bending die ring from falling during the installation process, keep the center line of the bending die ring parallel to the center line of the steel end cover 5, and facilitate the rotation of the steel end cover 5. Auxiliary limit function, after the installation is completed, the chamfered edge of each bending die 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 parts pushed by the bending pipe pushing mechanism. As shown in FIG. 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 fixedly installed on the frame 12 by bolts 11 , and the two guide bases 8 are installed inside There is a large bevel gear 10. The two large bevel gears 10 of the two guide bases 8 are arranged opposite each other and have a helical groove on the opposite end faces. The helical groove is a structure similar to a plane thread. The two guide bases 8 A plurality of guide blocks 13 are connected between them, the pipe fittings pass through the two guide bases 8 and the through holes opened in the center of the large bevel gear 10, and the plurality of guide blocks 13 are evenly spaced along the circumferential direction of the pipe fittings; both ends of the guide blocks 13 are provided with The rectangular teeth matched with the spiral groove are embedded in the spiral groove, so that both ends of the guide block 13 are connected to the large bevel gear 10; as shown in Figures 5 and 6, the guide block 13 is provided with An annular inner cavity, the steel ball 14 is tightly installed in the annular inner cavity, the guide block 13 is provided with a strip-shaped through groove toward the side of the pipe fitting, and the steel ball 14 partially penetrates the strip-shaped through groove and is connected to the pipe fitting. The annular inner cavity has a waist-shaped structure, and the straight line segment of the waist-shaped structure is parallel to the pipe fitting.

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

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

As shown in FIG. 1 , the elbow pushing mechanism includes a jaw 15, a chuck base 16, a sprocket 17, a driving shaft 18, a chain 19, a driven shaft 21 and a seat bearing 22; the chuck base 16 is equipped with a jaw 15 , the clamping jaw 15 clamps 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 sleeved on the driving shaft 18 and the driven shaft 21, the driving shaft 18 and the driven shaft 21 are Mounted on the frame 12 by means of seated bearings 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 clamped by the clamping jaws 15 to move horizontally through the chain drive.

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

The implementation process of the present invention is as follows:

1) As shown in Figure 4, according to the outer diameter of the pipe to be bent, turn the steel end caps 5 set in the two threaded rings 4, adjust the screwing position of the steel end caps 5 and the threaded rings 4, and drive the two The 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, and 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 cap 5, specifically, the chamfered edge of each bending die 6 is closely attached to the wedge-shaped surface of the steel end cap 5. At the same time, the size of the aperture enclosed by the inner ends of each bending die piece 6 in the bending die ring is changed to be suitable for the outer diameter of the pipe to be bent, and the variable diameter adjustment is completed.

2) The guide mechanism works, the small bevel gears 9 connected to the two guide bases 8 are driven synchronously by the two motors, and the large bevel gears 17 are driven to rotate, thereby driving the guide blocks 13 embedded in the spiral grooves of the large bevel gears 17 to advance along the radial direction of the pipe fittings. Give, press firmly on the surface of the fitting.

3) The bending tube push mechanism works, the driving shaft 18 is driven by the motor to rotate, and the chuck base 16 is driven to feed along the axial direction of the pipe, the small bevel gear 9 connected to the chuck base 16 is driven by the motor, and the large bevel gear 17 is driven to rotate , thereby driving the claw 15 embedded in the helical groove of the large bevel gear 17 to feed in the radial direction of the pipe.

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

Claims (10)

1. A free-curve pipe bender with a variable pipe diameter, characterized in that: the pipe bending pushing mechanism and the guiding mechanism and the bending die mechanism and the bending die mechanism installed on the frame (12) are arranged in turn along the transport direction of the pipe fittings. (12) Horizontal arrangement, the pipe fittings penetrate through the elbow pushing mechanism, the guide mechanism and the bending die mechanism; the bending die mechanism includes a bending die base (1), a magnet ring (3), a threaded ring (4), a steel end The cover (5), the bending die sheet (6) and the elastic band (7); the bending die base (1) is provided with a horizontal large hole, and a threaded ring (4) is fixedly installed in both ends of the horizontal large hole, and the two ends of the 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 fitted with respective steel end caps (5) through threads. A bending die ring is arranged between the end covers (5), the outer peripheral side of the bending die ring is close to the surface of the steel end cover (5), and the pipe fitting runs through the center of the bending die ring; the bending die ring is mainly composed of a circle around the circumference of the pipe fitting. The plurality of curved die pieces (6) are arranged, and the plurality of curved die pieces (6) are connected in series after passing through the middle of the elastic band (7). 2. A free-curve pipe bender with variable pipe diameter according to claim 1, characterized in that: each bending die (6) is provided with chamfers along the two corners of the radially outer end side of the pipe fitting, and two The opposite end faces of the steel end cover (5) are set as wedge-shaped surfaces matched with the chamfer, and the chamfered edge of the curved die (6) closely fits the wedge-shaped surface of the steel end cover (5). 3 . The variable diameter free-curve pipe bender according to claim 1 , wherein each bending die ( 6 ) is provided with a through groove for the elastic band ( 7 ) to pass through. 4 . 4. A free-curve pipe bender with variable pipe diameter according to claim 1, characterized in that: the threaded ring (4) adopts magnetic material, and the magnet ring (3) passes through the magnetic force and the threaded ring (4). ) connection. 5. A free-curve pipe bender with a variable pipe diameter according to claim 1, wherein the guide mechanism is located between the pipe bend push mechanism and the bending die mechanism, and pushes the pipe bend push 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 comprises two guide bases (8), a small bevel gear (9) and a large Bevel gears (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 opposite and on opposite end faces There is a spiral groove on the top, a plurality of guide blocks (13) are connected between the two guide bases (8), the pipe fittings pass through the through holes opened in the center of the two guide bases (8) and the large bevel gear (10), and many The guide blocks (13) are evenly spaced along the circumference of the pipe; the two ends of the guide block (13) are provided with rectangular teeth matched with the helical grooves, and the rectangular teeth are embedded in the helical grooves, so that both ends of the guide block (13) Connected to the large bevel gear (10); the guide block (13) is provided with an annular inner cavity toward the inside of the side of the pipe fitting, a steel ball (14) is tightly installed in the annular inner cavity, and the guide block (13) is provided with a bar-shaped passage toward the side of the pipe fitting. The steel ball (14) partially penetrates the strip-shaped through groove and is connected to the pipe fitting. 7. A variable pipe diameter free curve pipe bender according to claim 6, characterized in that: the guide base (8) is provided with a small bevel gear (9), the small bevel gear (9) It is meshed with the large bevel gear (10), and the small bevel gear (9) rotates to drive the large bevel gear (10) to rotate, and then drives the guide block (13) through the transmission structure formed by the spiral groove and the rectangular teeth of the guide block (13). Move radially along the tube. 8. A free-curve pipe bender with variable pipe diameter according to claim 1, characterized in that: the pipe bending push mechanism comprises a jaw (15), a chuck base (16), a sprocket ( 17), driving shaft (18), chain (19), driven shaft (21) and bearing with seat (22); chuck base (16) is equipped with jaws (15), which clamp pipe fittings , the chuck base (16) and the chain (19) are fixedly connected by screws (20). (18) and the driven shaft (21) are both mounted on the frame (12) through a seated bearing (22). 9. The variable pipe diameter free-curve pipe bender 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 passes through a chain The transmission drives the chuck base (16) and the pipe clamped by the clamping jaws (15) to move horizontally. 10. A variable pipe diameter free-curve pipe bender according to claim 8, characterized in that: the frame (12) is provided with a sliding rail, 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.