JPH0714558B2 - Friction welding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to frictional contact between a pipe and a pair of tubular workpieces such as a short pipe and a pipe flange which are held opposite to each other under pressure while rotating relative to each other. The present invention relates to an improvement of a friction welding machine that presses and presses.

[Prior Art] Generally, friction welding is used in many cases in order to reduce the cost of welding work, but in the rationalization of welding work in plant piping, pipe flanges are made long or already bent in one or two dimensions. For friction welding, the pipe flange must be rotated. By the way, when friction welding is performed, burrs are formed on the inside and outside of the pressure contact portion, so this burr must be removed.However, in the conventional method of cutting burrs by rotating the pressure welding material, the pressure welding pipe is It is difficult because it cannot be rotated. Further, there is a drawback that a burr cutting device has to be provided outside the pressure welding machine.

[Problems to be Solved by the Invention] The present invention has been proposed in view of the above-mentioned conventional circumstances, and shortens the length of a friction welding machine by rotating a short workpiece to perform friction welding. At the same time, with the work piece pressed against it fixed, the inner burr can be automatically cut by simply retracting it while rotating the spindle, and the structure can be simplified to make it compact. An object of the present invention is to provide a friction welding machine that can be performed and can be easily operated.

[Means for Solving the Problem] In order to solve the above-described problems, the present invention provides a friction in which a pair of opposed tubular workpieces are frictionally contacted with each other under pressure while rotating relative to each other. In the crimping machine,
At the center of the tip of the spindle, which is driven to rotate while holding the chuck that holds the short workpiece on the rotating side and is capable of moving forward and backward in the axial direction,
A small-diameter shaft integrated with the main shaft is provided, and at the tip of the small-diameter shaft, a burr cutting blade attached via a blade holder is held so that it is located inside the pipe on the fixed side of the press contact part during press contact, It is characterized by constituting a friction welding machine.

[Operation] Since the friction welding machine according to the present invention is configured as described above, the short work piece is brought into frictional contact with the long pipe held by the chuck under pressure while being held and rotated by the chuck. Will be pressed against each other. At this time, burrs are generated on the inside and outside of the press contact portion, but since the burr cutting blade at the free end of the blade holder is located inside the tube on the fixed side of the press contact portion at the time of press contact, it is not welded after the press contact. If the work piece is fixed and the main shaft is rotated and retracted,
The inner burr will be automatically removed by a burr cutting blade set according to the pipe size, which is retracted along with the main shaft.

After the inner burr is removed, the burr cutting blade together with the main shaft may be largely retracted in the axial center direction from the inner circumference of the press contact portion, and the pressed work may be pulled out from the friction welding machine.

[Examples] Hereinafter, the present invention will be specifically described based on Examples shown in the drawings.

FIG. 1 is a transverse sectional view of a friction welding machine showing an embodiment of the present invention, and FIG. 2 is a partially cutaway front view thereof. Further, FIG. 3 is a sectional view of an essential part of the swing angle adjusting means, FIG. 4 is a side view of a free end of a cutting arm, and FIG. 5 is a plan view showing a state in which an outer burr and a burr cutting blade are close to each other. FIG. 6 is a sectional view of the free end portion of the blade holder.

In the figure, reference numeral 1 is a long tube which is one tubular work piece pressed against each other, and is held by a clamp 2 and fixed horizontally. Reference numeral 3 denotes a pipe flange of the short workpiece on the rotating side, which is gripped by a chuck claw 4 and the pipe 1 and the pipe flange 3 are made to face each other.

Reference numeral 5 denotes a motor, and the rotational force of the motor 5 is switched by the clutch 6 and transmitted to the gear 8 via the coupling 7. Reference numeral 9 denotes a main shaft horizontally supported in a main shaft casing 11 via a bearing 10. A gear 12 engaging with a gear 8 is fixed to the outer periphery of the main shaft by a key, and the main shaft 9 is rotationally driven by a motor 5. ing. Incidentally, 13 is a brake, which can brake the rotation of the main shaft 9.

A small-diameter shaft 14 is formed integrally with the main shaft 9 at the center of the tip of the main shaft 9 that can move back and forth in the axial direction. Reference numeral 15 is a cylindrical contact member which is arranged concentrically with the small-diameter shaft 14 and is fixed to the main shaft 9, and its contact end 16 is in contact with the end surface of the pipe flange 3 held by the chuck claw 4. . Reference numeral 17 denotes a cylindrical piston that is mounted on the outer periphery of the cylindrical contact member 15 and can move back and forth in the axial direction, and its tip portion has three radial intervals at equal intervals.
One end of the L-shaped link 19 supported by the pin 18 is locked.

Reference numeral 20 denotes a chuck fixed to the tip end surface of the main shaft 9 by a bolt 21, and the chuck claws 4 are slidable along slider grooves 22 radially provided at three places at equal intervals in the radial direction of the chuck 20. The claw slider 23 is fixed to the claw slider 23 with a bolt 24, and the claw slider 23 is locked to the other end of the L-shaped link 19. Therefore, when the cylindrical piston 17 moves back and forth in the axial direction, the L-shaped link 19 tilts, the pawl slider 23 slides along the slider groove 22, and the chuck pawl 4 moves.
You will be able to grip or release the three locations on the outer periphery of the.

Next, 25 is a blade holder, and the screw portion 26 at the lower end thereof is screwed into a screw hole 27 provided at the center of the tip of the small diameter shaft 14,
It is fixed by tightening the nut 28. 29 is a burr cutting blade that is replaceable according to the size of the pipe that cuts the inner burr 30 generated in the pressure contact portion of the pipe 1 and the pipe flange 3, and is detachably fastened to the free end of the blade holder 25 with the set screw 31. It is fixed.
However, as shown in the drawing, the burr cutting blade 29 is held so as to be located in the tube on the fixed side by the protrusion distance 32 from the pressure contact portion, and the protrusion distance 32 is arbitrarily selected depending on the length of the blade holder 25. It's getting better.

Next, 33 is a cutting arm that is swingably supported by a support shaft 34 via a key, and a burr cutting blade 36 that cuts an outer burr 35 generated at a press contact portion is attached and detached with a bolt 37 at its free end. It is installed freely. 38 is a nut for preventing the cutting arm 33 from coming off from the tip of the support shaft 34.
The support shaft 34 attached to the base end of the main shaft 9 is arranged in parallel with the axis of the main shaft 9 and is rotatable via a sleeve 40 in a support case 39 fixed to face the front head of the main shaft 9. When the support shaft 34 is supported by the cutting arm 33, the cutting arm 33 swings in a direction perpendicular to the axis of the main shaft 9, and the burr cutting blade 36 attached to the free end of the cutting arm 33 causes the outer circumference of the press contact portion to move. It is designed to approach and retreat.

Reference numeral 41 denotes a plunger arranged in the support case 39 so as to be orthogonal to the support shaft 34, and a rod 43 thereof is provided with a rack 43, and the rack 43 is engaged with a pinion 44 provided on the support shaft 34. On the other hand, when the plunger 41 moves, the support shaft 34 is rotated by the rack 43 engaging with the pinion 44, and the cutting arm 33 is swung.

Next, 45 is a swing angle regulating stopper that regulates the swing angle of the cutting arm 33, which is attached to the tip portion of the rod 42 of the plunger 41 and is prevented from rotating by the stopper detent 46.
The swing angle regulated by the adjusting handle 47 can be adjusted. Incidentally, 48 is a cutting arm supported by the support shaft 34.
33 is a shaft center direction position adjusting bolt for adjusting the shaft center direction.

Next, A, B, C, D in the figure are hydraulic ports for supplying and discharging hydraulic oil.
When the hydraulic pressure is supplied from the hydraulic port A, the cylindrical piston 17 moves forward to open the chuck claw 4, and the back pressure is the hydraulic port B.
Will be drained through. On the contrary, when the hydraulic pressure is supplied from the hydraulic port B, the cylindrical piston 17 retracts to close the chuck claw 4, and the back pressure is drained via the hydraulic port A.

When hydraulic pressure is supplied from the hydraulic port C, the supplied hydraulic pressure causes the plunger 41 to move forward, swing the cutting arm 33 toward the pressure contact portion, and the burr cutting blade 36 causes the outer burr 35 to move.
Will be cut. At this time, the back pressure of the plunger 41 is drained via the hydraulic port D. On the contrary, when the hydraulic pressure is supplied from the hydraulic port D, the plunger 41 is retracted by the supplied hydraulic pressure, the cutting arm 33 swings in the direction away from the press contact portion, and the outer burr 35 is cut by the burr cutting blade 36. It will be terminated. At this time, the back pressure of the plunger 41 is drained via the hydraulic port C.

However, in the present embodiment, the inner burr 30 generated in the pressure contact portion is
To cut. The screw portion 26 at the lower end of the blade holder 25 having the burr cutting blade 29 at its free end is screwed into the screw hole 27 provided at the center of the tip of the small-diameter shaft 14 and is tightened and fixed by the nut 28. However, the burr cutting blade 29 that cuts the inner burr 30
The blade holder 25 having a free end is made into a short tubular shape, mounted on the outer periphery of the tip of the small diameter shaft 14, and fixed by tightening the nut screwed to the threaded portion provided at the tip of the small diameter shaft 14. Then, the blade holder 25 may be detachably attached to the small diameter shaft 14.

Since the friction welding machine of the present invention is configured as described above, when hydraulic pressure is supplied to the hydraulic port B to grip the pipe flange 3 which is a short workpiece with the chuck claws 4 and drive the motor 5, While the cylindrical flange 3 is gripped by the chuck claws 4 and rotated, the cylindrical flange 3 is brought into frictional contact under pressure with the long tube 1 gripped by the clamp 2 so as to oppose each other. However, in order to press the pipe flange 3 against the pipe 1, the entire main shaft housing 11 is moved with respect to the base, but the main shaft 9 may be moved.

When pressure is applied, burrs are generated on the inner and outer circumferences of the pressure contact,
In order to remove the outer burr 35 generated by the pressure contact, the hydraulic pressure is supplied to the hydraulic port A to open the chuck claws 4, and then the hydraulic pressure is supplied to the hydraulic port C by the swing angle adjusting means.
The burr cutting blade 36 may be moved closer to the outer periphery of the press contact portion and the main shaft 9 may be rotated to remove the burr.

Next, after the outer burr 35 is removed, hydraulic pressure is supplied to the hydraulic port D, the swing angle of the cutting arm 33 is adjusted by the swing angle adjusting means, and the burr cutting blade 36 is retracted from the outer circumference of the press contact portion. You can do it. At this time, the burr cutting blade 29 for cutting and removing the inner burr 30
Is located in the tube on the fixed side of the press contact portion, so that the inner burr 30 is automatically cut and removed when the main shaft housing 11 is retracted in the axial direction while the main shaft 9 is still rotating. It is possible and very convenient. After the inner burr 30 has been cut and removed in this way, the burr cutting blade 29 together with the main shaft 9 is retracted largely in the axial direction from the inner circumference of the press contact portion, and the rear end of the main spindle casing 11 contacts the limit switch to stop the retraction. And spindle 9
Is also stopped. At this time, since the cutting arm 33 is sufficiently retracted, when pulling out the pressed work piece from the friction welding machine, the burr cutting blades 35 and 29 do not interfere with the pulling out of the flange portion, and smoothly. The work can be repeated. However, it goes without saying that the burr cutting blade 29 is appropriately replaced according to the tube size.

In this embodiment, the pinion 44 attached to the support shaft 34 that swingably supports the cutting arm 33 and the plunger 41.
Although the rack 43 operated by is engaged with the swing angle adjusting means, the swing angle adjusting means may be configured by other means.

Further, for supplying / discharging the pressure oil to / from each of the hydraulic ports A, B, C, D, a common distribution valve may be used in addition to the hydraulic distribution valve for opening / closing the chuck claw 4 in one series.

[Effects of the Invention] As specifically described above, according to the present invention, since it is possible to perform friction welding by holding a long pipe on the fixed side and a short workpiece on the rotating side, friction welding can be performed. The length of the machine is shortened,
Not only is it cheap, it is easy to transport to the construction site.
Further, since the burr cutting blade for cutting the inner burr is held so as to be positioned in the pipe on the fixed side of the pressure contact portion at the time of pressure contact, it is retracted while rotating the spindle while the pressure contacted work piece is fixed. You can automatically cut the inner burr. Further, the burr cutting blade can be exchanged according to the pipe size, and can be used for cutting inner burrs of various pipe sizes. Also, when the inner diameter of the short work piece is pressed smaller than the inner diameter of the long pipe and pressure-welded, and the burr cutting blade is set back to match the inner diameter of the pipe and retracted, the inner surface of the pressure-contact portion is Since the inner surface is cut flush with each other without forming a step at the pressure contact portion between the short work piece and the long pipe, the flow resistance in the pipe does not increase at the pressure contact portion. Further, since the main shaft and the small-diameter shaft are integrated, the structure is simple, inexpensive and compact can be manufactured, and the handling is easy.
It has many advantages, such as good work efficiency, and it is necessary to join short pipes and pipe flanges to both ends of many pipes. It is possible to provide a friction welding machine that is extremely effective in practice when applied to on-site piping work in plant construction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a friction welding machine showing an embodiment of the present invention, FIG. 2 is a partially cutaway front view thereof, and FIG. 3 is a view of a swing angle adjusting means. Partial sectional view, FIG. 4 is a side view of the free end of the cutting arm, FIG. 5 is a plan view showing the approaching state of the outer burr and the burr cutting blade, and FIG. 6 is a sectional view of the free end of the blade holder. is there. 1 ... Pipe, 2 ... Clamp, 3 ... Pipe flange, 4 ...
Chuck claw, 5 ... motor, 6 ... clutch, 7 ... coupling, 8 ... gear, 9 ... spindle, 10 ... bearing, 11
...... Main shaft housing, 12 …… Gear, 13 …… Brake, 14 …… Small diameter shaft, 15 …… Cylindrical abutting member, 16 …… Abutting end, 17 …… Cylindrical piston, 13 …… Pin, 19 …… L-shaped link, 20 …… Chuck, 21 …… Bolt, 22 …… Slider groove, 23 …… Claw slider, 24 …… Bolt, 25 …… Tool holder, 26 …… Screw part, 27 …… Screw hole , 28 …… Nut, 29 …… Burr cutting blade, 30 …… Inner burr, 31 …… Set screw, 32 …… Projection distance,
33 …… Cutting arm, 34 …… Support shaft, 35 …… Outer burr, 36 ……
Burr cutting blade, 37 …… Bolt, 38 …… Nut, 39 …… Support case, 40 …… Sleeve, 41 …… Plunger, 42 ……
Rod, 43 …… Rack, 44 …… Pinion, 45 …… Rotation angle restriction stopper, 46 …… Stopper rotation stopper, 47 ……
Adjustment handle, 48 ... Shaft center position adjustment bolt.

Claims (1)

[Claims] 1. A friction welding machine in which a pair of tubular workpieces held facing each other are brought into frictional contact with each other under pressure while rotating relative to each other, and a chuck for holding a short workpiece on the rotating side is held. A small-diameter shaft integrated with the main shaft is provided at the center of the tip of the spindle that can be moved back and forth in the axial direction, and a burr cutting blade attached via a tool holder is attached to the tip of the small-diameter shaft. During friction welding, the friction welding machine is characterized in that it is held so as to be positioned inside the pipe on the fixed side of the welding portion.