FR2668406A1 - DEVICE FOR FASTENING ON A BAR SHEAR FOR CHANGING TRUNCTIONS OF PRECISE LENGTHS. - Google Patents

Abstract

The invention relates to an attachment device, on a bar shear for slicing sections of precise lengths of steel bars or billets to be used as slips for forming, comprising a train of rollers controlled to feed the billet or the like. in the working space of the shear, a blank holder for fixing the billet or the like in position against a blank holder stop, and a feed device in the form of an axially movable feed clamp. In order to be able to better adapt the feed device to the deformed configuration of the bars or billets to be sliced, with a view to slicing at a precise weight, the fixing of the clamps, when using a feed device comprising a fixed clamp (7) and a movable gripper (6), is carried out using spring return bars (23,24,25,26,28,29).

Description

The present invention relates to a fastening device, on a shear

  bar for slicing sections of precise lengths of steel bars or billets to be used as blanks for forming, having a set of rollers controlled to bring the billet or the like into the work area of the shears, a blank holder for securing the billet or the like against a blank holder stop, and a gripper-like feed device

axially mobile advance.

  A bar shear of this type is known from the German patent.

  DE-C 34 14 233, the feed device having a fixed gripper and a movable gripper The feed gripper is provided with a continuously adjustable travel limiter with a positioning motor enabling the length of the segments to be adjusted. Slicing A clamp, mounted on the shears and seizing the billet, is also provided, clamp of which

  the beaks are axially biased by compression springs.

  pel The return springs absorb the axial displacement of the bar

  appearing during slicing, the influence of plastic deformations

  variables to be removed during the cut to be

  Sliding length adjustment The return springs have a double function They ensure that the bar can be axially compensated during the slicing process, so that it can then return to its original position. grip the bar, relative to the entire system, without play in its initial position The reminder to the neutral center position

  by means of coil springs, which are

  wind in the axis of the correction movement Such an embodiment

generates a certain congestion.

  The invention aims, by means of another configuration

  constructive, to be able to adapt even better, that is to say,

  The flexible device for feeding the deformed configuration of the bar or slicing billet to obtain slicing at a precise weight is characterized by the fact that, when a slicing device is used, advance with fixed clamp and pliers

  the clamps are fixed using elastic bars

ticks.

  The bar or billet to be transported is deformed on its long axis.

  gitudinal, and twisted in its section, within given limits.

  yieldability is a basic requirement for slicing at a precise weight It is very important that the clamping of the section of the bar or billet is geometrically

  unequivocally, by means of the planned fixing of the elements of the

  In advance, the clamp can, by means of the elastic bars, adapt quickly to the momentary state of the section, and return in place by

  The elastic bars guarantee the possibility of transla-

  tion, of a given amount, of the clamping plane in the horizontal direction, in the vertical direction, and in the circumferential direction of the section. This can be obtained in a relatively simple manner by the fact that the fixing of the clamps is carried out for This means that the elements of the advance device can follow correctly and reliably the irregular shape of the bar or billet, due to a curved shape or even

  at a twisting, a reminder of the elements of the feed device is

  lant automatically according to the variation of the section shape over the length The clamp can easily adapt to the momentary state of the section This is enabled by the fact that the clamping plane is designed

  movable in translation in the horizontal direction, in the vertical direction

  tical and in the circumferential direction of the section, using

  Elastic bars Elastic bars provide geometric clamping

  metrically unambiguous section of the bar or billet.

  According to a further characteristic of the invention, the elastic bars are arranged in pairs. It is advantageously provided for the mobile clamp, a pair of elastic bars in the horizontal plane and another pair of elastic bars in the vertical plane. to be maintained using a pair of

  elastic bars arranged in a horizontal position, which is suf-

  if the clamp is mounted near the shears.

  The elastic bars can advantageously be arranged in such a way that for the mobile clamp, the pair of vertically placed elastic bars is arranged between the transport carriage and a

  intermediate plate, and the pair of elastic bars placed horizon-

  is placed between the intermediate plate and the manual clamp.

  For the fixed clamp, the pair of elastic bars can be pre-

  view between the transport trolley and the fixed clamp.

  The following description describes in more detail the invention with the aid of the accompanying drawings, in which: FIG. 1 is a diagrammatic elevational view of the fixing device according to the invention. FIG. 2 is a projection view of the device of FIG.

1 in the direction of the arrow II.

  FIG. 3 is a sectional view of the device of FIG. 1

along line III-III.

  FIG. 4 is a view from above of the device of FIG. 1

in the direction of arrow IV.

  The feed device 1 for slicing sections of precise lengths of billets or the like, has a support 2, which consists of a support front portion 3, a rear support portion 4 and sleepers 5. advance comprises a collet 6 movable in the direction of the longitudinal axis, and a fixed collet 7 The bar or billet 8 to be conveyed is fed to the feed device via a train of rollers 9 mounted

  upstream, until it reaches the area of the service clip.

  mobile rabies 6, following which the latter takes charge of the

following the transport of the bar.

  The clamping of the bar to be machined takes place between the plates 11 arranged at 45 and a hydraulic jack 12 in the cross member 13. In the open state of the clamp, the crossbar 13 rests on the abutments 14.

  fixed gripper 7 has corresponding elements, namely a

  13a in which are mounted oblique plates 11a, and a hydraulic cylinder 12a for clamping the machined part The cross 13.13a can be raised with a hydraulic cylinder 15.15 a, which can s 'prove necessary when threading the bar in

the cutting space of the shears.

  A transport carriage 17 is mounted with the possibility of transferring

  lation in the longitudinal direction of the device by means of its guide bushes 18, the guides 19 being mounted in a fixed manner, 1 aiïb

  eyelet parts 20, on the lateral parts 3 and 4 of the support.

  The transport carriage 17, 18 is driven via a servo-hydraulic cylinder-piston assembly 21, and it performs a displacement stroke corresponding to the length of the sections to be sliced. In the feed device shown, the fixing and the return of the mobile gripper 6 as well as the fixed gripper 7 are effected at

  means of elastic bars For the movable clamp 6, the elastic bars

  ticks are arranged in pairs, namely the pair of elastic bars 23, 24 in the vertical plane and the pair of elastic bars, 26 in the horizontal plane For the fixed clamp 7, two elastic bars 28, 29 in horizontal position are considered sufficient, since this clamp is mounted relatively close to the shears and that the horizontal differences are only very small For the mobile clamp 6, the pair of elastic bars placed vertically 23, 24

  between the transport carriage 17 and an intermediate plate

  31, while the pair of elastic bars 25, 26 placed in the horizontal plane is disposed between the intermediate plate 31 and the movable clamp 6. The elastic bars 28, 29, which lie in the horizontal plane, extend between the support 2 and the fixed clamp 7 The elastic bars 23,24 allow easy translation of the intermediate plate 31 in the horizontal direction The movable clamp 6 can be easily moved in the vertical direction via the assembly of the elastic bars 25, 26 The easy movement of

  Clamps is made possible by the length of the elastic bars.

  The elastic bars provide suspension suspension to the

  Cardan of the mobile clamp and that of the fixed clamp, with recall.

  Thanks to the elastic bars arranged in pairs, the clamps can be displaced in translation in the circumferential direction of the section of the bar to be sliced. Bending and / or torsion stresses, depending on the state of the section of the bar to be cut. slicing, then appear with an automatic recall force in the

  elastic bars As a result of the removal of the

  rage, which is achieved by removing the cylinder-piston assembly

  12,12 a of the hydraulic cylinder concerned, the clamp is automatically reduced

  only in the neutral, horizontal and rotational position In the unclamped position, the clamp rests vertically on the

  abutments 14,14 a This guarantees a geometric clamping-

  unequivocal section of the bar or billet The gripper can adapt to the momentary state of the section of the machined part The clamping plane can be moved in translation in the horizontal direction, in the vertical direction and in the circumferential direction of the

  section of the workpiece, with automatic return to the neutral median position This is true, with the exception of the horizontal translation, both for the mobile clamp and for the fixed clamp This dis-5 positive allows to perform a slicing at a precise weight.

Claims (5)

  1 Fixing device on a bar shear for slicing lengths of precise lengths of steel bars or billets for use as blanks for forming, comprising a train of rollers controlled to bring the billet or the like into   the shear workspace, a blank holder for fixing in position   the billet or the like against a blank holder stop, and an axially movable advance gripper feed device,   characterized in that, when using a feed device   carrying a fixed gripper (7) and a movable gripper (6), the fastening of the grippers is effected by means of resilient return bars (23,24,25,26,28,29).   Fastening device according to claim 1, characterized in that the elastic bars (23,24; 25,26; 28,29) are arranged in pairs.   Fastening device according to claim 1 or 2, characterized   characterized in that a pair of resilient bars (25, 26) in the horizontal plane and a further pair are provided for the movable clamp (6).   elastic bars (23,24) in the vertical plane.   4 Fixing device according to any one of the claims   1 to 3, characterized in that the fixed clamp (7) is held by a pair of resilient bars (28, 29) arranged in a horizontal position. Fastening device according to one of Claims 1 to 4, characterized in that for the moving clamp (6) the pair of elastic bars (23, 24) in the vertical plane is arranged between the transport carriage ( 17) and an intermediate plate (31), and the pair of elastic bars (25, 26) placed horizontally is   disposed between the intermediate plate (31) and the movable clamp (6).   Fastening device according to any one of the claims   1 to 5, characterized in that the pair of elastic bars (28, 29) for the fixed clamp (7) is arranged between the support (2) and the fixed clamp (7).