FR2635476A1 - Machine for the manufacture of coupling elbows - Google Patents

Abstract

The subject of the present invention is a machine for the manufacture of coupling elbows by the upsetting of a section of pipe 17 in a die 6 and the simultaneous forcing of a series of balls 9 into the pipe, comprising an external upsetting tube 11 which is mounted so as to slide in the die, an internal piston 14 which can slide in the external piston and is suitable for driving the balls 9 into the section of pipe 17, and means for making the two pistons 11 and 14 slide. According to the invention, this machine includes a plate 5 which is mounted so as to pivot about a fixed cam 1 and includes a certain number of workstations. The cam 1 has two peripheral ramps 3 and 4 suitable for moving respectively the external piston 11 of each workstation.

Description

It is known to manufacture connecting elbows by forcing a section of straight tube into a matrix of corresponding shape while simultaneously driving out a series of balls inside the tube. This process is implemented using a machine comprising an external delivery piston which is slidably mounted in the die, an internal piston which can slide in the external piston and is capable of driving the balls into the section of tube. , and means for sliding the two pistons.

The present invention relates to a machine of this type which has the advantage of giving much better results than when the means for moving the pistons are, as at present, constituted by hydraulic pushers.

The machine according to the invention is characterized in that it comprises a plate which is pivotally mounted around a fixed cam and comprises a certain number of work stations, and in that this cam has two peripheral ramps suitable for moving respectively the inner piston and the outer piston of each work station.

An embodiment of the machine according to the invention has been described below by way of non-limiting example, with reference to the accompanying drawings in which
Figures 1 to 4 are sectional views of
one of the workstations, at stages of
different operations; -
Figure 5 is a plan view of the cam
fixed.

The machine for manufacturing connection elbows according to the invention comprises a fixed cam 1 which is of revolution # flt # urd'un axis 2, and has two ramps 3 and 4. A turntable 5 is pivotally mounted around the axis 2 and has a number of work stations, for example ten.

Each work station comprises a matrix 6 in which a bent shaping imprint 7 is formed.

One end of this imprint is located opposite a distributor 8 for balls 9 whose diameter is substantially equal to the inside diameter of the tube with which the elbow is to be produced. A pneumatic lock 10 is provided at the base of this distributor.

The other end of the cavity 7 is located opposite an external piston 11 which is slidably mounted in the plate 5 in the direction of the axis of the bore 7; a spring 12 tends to apply this piston against the ramp 4 with interposition of balls 13. The end 11a of this piston 11 can slide in the cavity 7 of the powerplant 6 and has an outside diameter equal to the diameter of this cavity.

In the piston 11 is slidably mounted a second piston 14; a spring 15 tends to apply this piston against the ramp 3 with the interposition of a ball 16.

The path required by the plate 5 to form a connection elbow is equal to one revolution of the plate around the cam 1.

In FIG. 1, a section of tube 17, the outside diameter of which is equal to that of the bore 7, has been introduced into the imprints 7 and the piston ll has been brought close to the outlet of this imprint. The ends of this section have been adjusted according to the angle of the elbow which may for example be of So e, 600 or 750; in the case of a bend at 900, the ends of the section were cut 450.

The turntable actuates a microswitch which actuates the lock 10: the balls 9 fall into the matrix 6 and are introduced into the tube 17, then into the piston li until they are in contact with the piston 14 ( Figure 2).

 The plate continues to rotate, the outer piston ll slides in the die 6, under the effect of the ramp 4 and the inner piston 14 slides in the piston 11, under the effect of the ramp 3, but slightly faster than the piston 11. The piston 14 pushes the balls 9 into the tube 17; the piston ll drives back inside the cavity 7 the tube 17 which is guided internally by the balls. The tube takes an angled shape (Figure 3).

Then the piston 14 continues to advance; the balls 9 come out of the bend by calibrating it and are locked in the magazine 8 by the latch 10 (Figure 4).

At the end of the cycle the pistons 11 and 14 move back, the elbow is ejected and a new cycle can take place.

It goes without saying that the present invention cannot be considered as limited to the embodiment described and shown, but on the contrary covers all variants thereof.

Claims (1)

Claim  Machine for manufacturing connection elbows by pushing a section of tube (17) into a matrix (6) and simultaneously forcing a series of balls (9) inside the tube, comprising an external delivery tube (11) which is slidably mounted in the die, an internal piston (14) which can slide in the external piston and is capable of driving balls (9) into the section of tube (17), and means for sliding the two pistons (11 and 14), characterized in that it comprises a plate (5) which is pivotally mounted around a fixed cam (1) and comprises-- a number of work stations, and in that this cam (1) has two peripheral ramps (3 and 4) suitable for respectively displacing the internal piston (14) and the external piston (il) of each work station.