FR2515105A1 - ARTICULATED CONTROL FOR PRESS SLIDERS IN WHICH, DURING THE WORK RACE, AN ENDS OF IMMOBILIZED MASSES ARE TO BE ACCELERATED THEN ACCELERATED - Google Patents

Abstract

THE INVENTION CONCERNS AN ARTICULATED CONTROL FOR PRESS SLIDERS IN WHICH IS CARRIED OUT, DURING THE WORKING STROKE, AN ADDRESS OF IMMOBILE MASSES WHICH MUST BE ACCELERATED IMMEDIATELY AFTER. IN REGION C WHERE THE SLIDER 11 COMES TO ARRIVE ON THE IMMOBILE MASS, THE CONNECTING ROD 9 PASSES ON THE CURVE 14 DESCRIBED BY THE COUPLING POINT OF THE ARTICULATED CONTROL, BY AT LEAST TWO SUCCESSIVE POINTS A, B WHICH MATCH EXACTLY OR APPROXIMATELY WITH ROD OSCILLATION RADIUS OF THE CONNECTING ROD TO ARRIVE AT ZERO OR APPROXIMATELY ZERO SPEED. THIS IS SO MUCH BEFORE HITTING GROUND THE SLIDER IS SLOWED TO ZERO OR APPROXIMATELY ZERO SPEED. IT IS SO SOFTLY, TO ACCELERATE, IMMEDIATELY AFTER, THE MASS FROM ITS ZERO SPEED.

Description

The invention relates to an articulated control for press slides.

  in which is carried out, during the working stroke, an approach of immobile masses which must then be accelerated. In this respect, for example, embossing cushions, keying tools, point cutting,

hollow forging or the like.

  As a consequence of the high speeds which are necessary and can be attained in the product range, at the moment when the slider comes to strike these immobile masses, damages, increased noise, accelerated wear and, consequently, decrease

the length of service.

  In order to maintain within acceptable limits these disadvantages and in particular the damages and to achieve

  even higher speeds, it is proposed, according to the invention

  tion, an articulated control of the type defined in the preamble which is characterized in that in the region where the slider comes to rest on the immobile mass, the rod passes, on the curve described by its coupling point, by at least two successive points which coincide exactly or approximately with the radius of oscillation of the connecting rod, to arrive at a zero or approximately zero speed. In this way, it is possible for the slider to slow down at a speed shortly before striking the mass. zero or approximately zero, that is to say, it lands gently, to accelerate immediately after the mass

from its zero speed.

  According to an advantageous embodiment, the curve described by the coupling point has the shape of an eight. It is also advantageous for the angle of the triangular lever to be equal to or

2 2515105

  greater than 902 Thus shortened is the time during which the press is closed, that is to say that one has in practice a longer time for the loading or for the putting into action

  other automation and mechanization devices.

  Another essential feature of the invention is that the measurement between the first stop point and the second stop point (u T> is approximately 1/3 to 1/7 of the total stroke This can be achieved for example by making sure that one of the points of articulation

  adjustable To do this, it is possible to provide an excen-

  for the adjustment of the point of articulation A second possibility

  could be to use a second command to manually

  to generate the curve described by the point of coupling.

  Moreover, it is advantageous, according to the invention, for the measurement between the first stopping point and the second stopping point.

  (IAT) is adjustable in small limits.

  It is also proposed according to the invention that the angle of the crank between the first stopping point and beyond the second stopping point (u T) to the same position of the slider

  at the first stopping point, be smaller than 1302.

  The invention is hereinafter explained in more detail with reference to the accompanying drawings which show schematically

two articulated controls.

  The articulated control shown in FIG.

  essentially of the compression bar 2, the triangular lever

  4, the crank arm 6 and the connecting rod 9.

  The compression bar 2 is mounted at a fixed point higher than

  1 on the frame of the press which has not been further shown the hinge point 3 of the compression bar 'oscillates on a circular path 13 The crank arm 6 can turn on the crank ring 12 and it is rotatably mounted at point 7 During the operation of the press, the pivot point 8 moves by forced guidance on the curve 14 described by the coupling point In these conditions, the slider 1 1 travels the complete stroke; The levers are chosen in such a way that when the slider 11 has traveled

  a race x-y, at least two successive points a and b are

  wind exactly or approximately on a common radius around the occupied point c In this way, we obtain, at this point c, a zero velocity or approximately zero It is indeed at this point c that the slider 11 lands on the immobile mass , for

  accelerate immediately afterwards.

  The partial stroke is practically traversed between the first stopping point and the second stopping point (u T 1 It is appropriate in these conditions that the measurement is of the order of 1/3 to 1/7 of the complete stroke x To make the point c adjustable with respect to the complete stroke x, there is for example the possibility of making one of the articulated points in the form of an eccentric With this adjustment possibility, it is possible to Juster as needed the point of contact c of the

slide 11.

  FIG. 2 illustrates a variant of the articulated control,

  in which there are provided two crank controls The first

  first crank drive consists of 6a crank arm

  which is connected to the bent rod 4a at the hinge point 5a.

  The crank arm 6b, mounted at the point of rotation 7, is

  connected to the coupling rod 15 at the pivot point 5 b.

  In turn, the coupling rod 15 is connected to the lever arm 17 at the pivot point 3 of the lever arm 17 described, by its point of articulation 3, a path 13 around the fixed point 1 Due to articulation 3, the pressure transmission part 16 acts on the hinge point 8, which at the same time constitutes the junction point between the bent rod 4 a and the connecting rod 9. The hinge point traverses a curve 14 described. by the coupling point The connecting rod 9 is connected to the slide 11 at the point of articulation 10 The others

  movements occur exactly as in the

  cu Lée described with reference to FIG 1.

RBV 3NDICATIONS

  1 Articulated control for press slides in which

  during the working run, an approach is made to immobile masses which must be accelerated immediately afterwards, characterized in that at point (c) where the slide (11) comes to rest on the immobile mass, the connecting rod (9 ) passes over the curve (14) described by the coupling point of the articulated control,

  by at least two successive points (a, b) which coincide exactly

  or approximately with the instantaneous radius (r) of oscillation

  the connecting rod, to reach zero speed or approxi-

basically zero.

  2 articulated control according to claim 1, characterized in that the curve (14) described by the coupling point has the

shape of an eight (fig 1).

  3 Articulated control according to claim 1 or 2, characterized

  in that the angle of the triangular lever (4) is equal or

greater than 9 00.

  Articulated control according to one of the claims

  1 to 3, characterized in that the measurement (y) between the first stopping point (c) and the second stopping point (u T) is of the order of 1/3 to 1/7 of the scourse complete (x)

  Articulated control according to any one of the claims

  1 to 4, characterized in that the measurement between the first stopping point and the second stopping point (u T) is adjustable within small limits 6 Articulated control according to claim 5, characterized in that one points of articulation is made in an adjustable manner. Articulated control according to Claim 6, characterized in that

  what is planned an eccentric for the adjustment of the point of

lation.

  Articulated control according to one of the claims

  i to 7, characterized in that a second crank drive is arranged for generating the curve described by the coupling point.

  Articulated control according to any one of the claims

  1 to 8, characterized in that the angle of the crank between the first stopping point and, beyond the second stopping point (u T) to the same position of the slider as at the first stitch 'stop,

is smaller than 1302.