FR2666267A1 - FASTENING FOR THE TIGHTENING OF MULTIPLE WORKPIECES FOR MACHINING. - Google Patents

Abstract

This fixing is of the type in which the clamping is effected by means of jaws which are double-acting, one (F) comprising a fixed clamping surface and the other (R) being movable, and in which the fixed jaws are fixed in rows in a known manner, for example by means of tie rods (B), on beams (4, 5) or in slides provided in a frame, thus constituting a frame. According to the invention, in its part facing the movable jaws, the fixed jaw (F) is shaped like an arrowhead, or part of it, comprising flat sliding surfaces (7 , 8) along which the movable jaw, which is divided into two parts (R1, R2) can slide in such a way that their end surfaces are moved parallel to a direction essentially coinciding with that of the beams (4, 5), the displacement being performed in a known manner, for example by means of a screw (A) mounted between the movable jaws (R1, R2), while the positioning along the beams is guided by means of holes (14, 15) arranged equidistantly in the beams (4, 5) or a corresponding frame provided for the jaws, which holes have their corresponding in the fixed jaws (F), the positioning being carried out by means of a pin which passes through the jaw thus as the beam or the mount.

Description

1 - Modern machining equipment such as milling machines and

  Drills are normally controlled by means of devices which are such that several workpieces must be fixed at the same time in order to ensure an advantageous treatment. A condition to be respected for this purpose is that all the parts are positioned in

  equipment so that an allowable variation can be maintained

  kept under control It is essential that parts can be assembled quickly and that parts replacement after

  treatment can also be performed in a reduced time.

  It is in this technical field that the present invention aims, first, to position a number of fasteners in a given apparatus and, secondly, to allow the establishment of these fasteners in a manner rendering possible quick release of the parts to be machined and making the implementation reproducible of

  can be used in machine tools with numerical control

  than. In an ordinary vice, the problem has been solved by putting

  simply place a workpiece between two jaws Habitual-

  one of the jaws is fixed and the other is movable by means of any type of guiding means which causes a tightness of the workpiece.

between the jaws.

  The problem here consists in arranging a certain number of double acting fixed vises on a worktable or a frame, so that the positioning of the fixed jaws is determined so that the positioning can be used as coordinates. in a numerically controlled machine, which allows reproducibility after

mounting in the machine.

  The invention resides in a simple modular unit or plate which, in a known manner, can be positioned and mounted in a

  processing machine Such units are often referred to as

  The term "mount" means a unit with

  so many fixed and mobile jacks A frame can be made

  killed two beams in each of which is provided a slide for a anchor However, the mount can also be constituted by a plate, specifically a modular plate with slides and positioning holes for implementation next According to the invention, the workpieces are clamped in a frame, between a fixed jaw and a movable jaw. A movable jaw is located at the rear of a jaw.

  jaw fixed and is mounted mobile vis-à-vis this fixed jaw.

  The solution of the problem is thus to place a certain number of vises in a reproducible manner in a mount can then mount it in any machine in a manner

known.

  The subject of the invention is an attachment intended to enable the

  clamping of several workpieces to be processed by machines

  such as numerically controlled machines, of the type in which clamping is effected by means of jaws which are double-acting, one having a fixed clamping surface and the other being movable, and in which the fixed jaws are arranged in rows in a known manner, for example by means of tie-rods, on beams or in

  slides in a frame, thus constituting a frame,

  characterized in that, in its portion facing the movable jaws, the fixed jaw is shaped like an arrowhead, or part thereof, having planar sliding surfaces along which the jaw movable, which is divided into two parts can slide so that their front surfaces are moved parallel to a direction substantially coinciding with that of the beams, the displacement being executed in a known manner, for example by means of a screw mounted between the movable jaws, while the positioning along the beams is guided by means of holes equidistantly arranged in the beams or a corresponding frame provided for the jaws, which holes have their corresparla s da Is the fixed jaws, the positioning being executed by means of a pin

  which crosses the jaw as well as the beam or the mount.

  According to one particularity of the invention, the fixed jaw is positioned in the frame or the machine by means of fixing pins. Different combinations of holes formed in the fixed jaw can be positioned relative to other holes formed in the 3 -

  frame or work frame of the machine, for example two beams.

  According to another particularity of the invention, the clamping force on the fixed jaw comes from a combination of wedge-shaped pieces and sliding planes, some of which are part of the fixed m Achoire and the others are part of prisms. The second can slide in a known manner vis-à-vis the first movement or sliding can for example be obtained at

  means of any type of screw connection.

  In order to prevent unwanted play or displacements of the mobile unit, the sliding plane of the fixed unit can be tilted or provided with guiding devices. In such cases, the mobile unit is clamped between the fixed jaw and the frame or the

  beams when clamping forces are applied.

  Other features and advantages of the invention are

  of the description of advantageous modes of

  non-limiting and with reference to the accompanying drawings in which: Figures la and lb illustrate the problem of clamping a workpiece,

  Figures 2a and 2b illustrate the problem posed when

  3a and 3b are respectively top and side views illustrating the manner in which a free and a fixed unit may form a unit, FIGS. 4a, 4b are shown in FIGS. and 4 c represent a double jaw according to the invention,

  FIG. 5 shows the assembly of several double

  This figure also illustrates a certain advantage of double m Achoires, and Figure 6 illustrates finally the problem of a series of holes.

and the displacement of the jaws.

  The problem is clearly stated in Figure 1 on this

  1, a workpiece 1 is fixed between two jaws 2 and 3 These mems are themselves mounted on two beams or beams 4 and 5

  The mount can be made in many ways

  An effective way is to use tie rods if 4 -

  the beams include slides in the manner of a drill table.

  This can be seen schematically in perspective in Figure la and side in Figure lb. Several pieces to be machined can be mounted at the same time in series between jaws, as shown in FIG. 2. In this figure, four pieces were clamped in the same manner as in FIG. 1. Thereafter, the pieces will be represented. hatched even if they are not shown in section The hatching is supposed to make it easier to distinguish the jaws of the workpieces on the

drawings.

  In the drawings, different line thicknesses were used.

  rents to distinguish different units from each other.

  The present invention provides on each jaw an agency-

  This makes it a double-acting jaw, a fixed jaw acting in one direction and a movable jaw in the opposite direction. Mounting the fixed jaw on a given frame is also an important object of the invention. From Figure 2b, an area between two workpieces has been enlarged in Figure 3a.

  enlargement, two workpieces can be observed between these two

  In this case, a fixed jaw F and a movable jaw R can be seen between the latter, there is an element 6 used to move the moving jig with respect to the fixed jaw. The arrangement which can be seen from FIG.

  side in Figure 3a is seen from above in Figure 3b.

  It can be seen that the fixed jaw F extends to

  above the two beams 4 and 5 of the frames which allows anchoring

  of this fixed jaw F on a machine frame by the intermediary of

  beams or directly by means of slideways provided for example in the table of a drill, slide parts that can be made in a known manner in the beams These anchoring elements for fixing a beam on a frame machine or in a mount are known to specialists in the field and are not part of

of the invention.

  Some of the details that make up particularities are

  shown in Figure 4 Among these, we can see, from above to Figure 4a, a fixed M F fixed and a movable jaw divided in two

  parts (RI and R 2) This unit separates two workpieces 1.

  The fixed jaw has the shape of a blunt spike having two sliding planes 7 and 8 forming a certain angle between them. The tip of the spire is arranged in a symmetrical manner between the two

  mounting beams 4 and 5 or slides in a frame.

  The two parts of the mobile jaw can slide along these planes In this figure, the mobile jaw consists of two prisms (R1 and R2) having three faces forming, in section, right angles between them, while the fourth is inclined relative to two others A cross section of these prisms has the shape of a trapezoid The inclination of the fourth face is essentially

  equal to half of the angle 9 formed by the jib of the fixed jaw.

  By means of a screw A, whose axis is marked in the figure, it is possible to

  in this manner, the prisms slide along the sliding planes 7 and 8 of the fixed m m Achoire in such a way that the two prisms can be moved closer together or away from each other.

  that their front surfaces 10 and 11 move in a substantially

  parallel to the direction of beams 4 and 5 Other methods

  to apply clamping forces are known to specialists

  your. The two prisms R 1 and R 2 and the fixed arrow-shaped jaw are characteristic of the present invention. These prisms are connected to the fixed jaw in any known manner. It has proved advantageous that these prisms slide on any frame. , by

  example on the beams 4 and 5 provided at a rate of one for each prism.

  Of course, these prisms can slide on a flat surface comprising

  both slides provided for anchors, the beams being only used to symbolically represent a fastener on a machine or in a mount This is shown from side to Figure 4 b The axis of the screw A is also indicated In order to reduce the risk of tilting prisms, it has proved advantageous to use pyramid trunks at

  instead of right prisms, which is shown in Figure 4c.

  In this case, a part of the arrangement of FIG. 4b has been modified. This modification resides in an inclination of the sliding planes 7 and 8, these forming with the frame an angle less than one

  right angle, while the pyramids have been given corresponding inclinations

  This is clearly shown in FIG. 4c showing the inclined line 12 of contact between the arrowhead and a truncated pyramid. The contour of the hidden tip 13 has also been indicated. The previous parallel displacement of the front surfaces 10 and 11 of the prisms is modified in such a way that the pyramids are applied against the lower part because of a weak wedge effect between the arrow tip and these prisms. As before, the front surfaces 10 and 11 form right angles with the lower frame. The sliding surfaces 7 and 8 on R 1 and R 2 may also be provided with lips or guide grooves which prevent a

  tilting pyramids or prisms.

  With this last modification, a clamping of the workpieces 1 against the frontal surface of a moving jaw is obtained that is safer than in the case of a mobile suspended m achoire or a

  jaw disposed on guide rods.

  In an advantageous application, the fixing of the fixed jaw F on the beams 4 and 5 is carried out by means of two anchors B which pass through this fixed jaw and are movable in rails made in the beams. This is not shown. to the drawings since this is a well-known technique The axes of these anchors, or any other known means used to fix the fixed jaw, in a removable and sliding manner along a beam, on such a beam or on a worktable, are indicated

  through the central hole in Figures 4, 5 and 6.

  In FIG. 5, a few workpieces 1 and two workpieces 21 and 22 are clamped. Those that have to be examined in detail are the two workpieces in the middle of the figure. Three pairs of workpieces F, R1 and R2 are required to tighten. two pieces In this case, one can

  tighten pieces 21 and 22 with a certain difference in

LATIONS.

  In FIGS. 4 a and 4 b, three C holes are shown

  in the fixed jaw F on each side of the workpieces 1 These holes can also be found in FIGS. 5 and 6 In FIG. 5, two rows of holes in each beam can also be observed.

  holes are covered in places by the jaws F, R1 and R2.

  The combination of the holes C in the stationary jaws and the row of holes 14 is another feature of the invention. Focusing on the lower row 15 provided in one of the beams and on the lower hole 16 provided in FIG. the fixed jaw, the specialist understands that the fixed jaws can be placed at equidistant intervals, the interval being determined by the distance 17 between the holes provided in the beam It is thus easy to mount fixed jaws at distances fixed to the fixed jaws. 'advance one by

report to the other.

  With large holes, for example 10 mm in diameter, it is possible to obtain a reproducible and permanent positioning of the fixed jaws on the beams 4 and 5 or in a frame, using a pin

  crossing the jaw and beam When a number of jaws

  res have been positioned along the beams, they can be fixed on the latter using any known means, for example anchor bolts B. The change of place that is possible for the fixed jaws is determined by the distance 17 existing between the holes 15 provided in the beams Greater flexibility of use can be obtained by means of two rows of holes in the beams and

  two additional holes on each side of the fixed jaws.

  If a line 18 passing through the centers of the holes provided in a beam and another line 19 passing through the centers of the corresponding holes provided in the fixed jaws are intersecting between them, the positioning flexibility of the fixed jaws along the beams is even more large A third hole suitably placed on each side of the

  Fixed jaw can still increase this flexibility.

  We arrive at a solution such that the periodicity of the posi-

  along the beams 4 and 5 or in the mount is less than the clamping amplitude 20 or the displacement capacity of the truncated pyramid Rt and R 2 This is illustrated in Figure 6 in which one of the pyramids is in its furthest position and the other, in its retracted position. It is then possible to place the fixed jaws F along the beams or in the rails of the frame in such a way that the

  variation in the length of the workpieces, for example due to the cutting of

  ge, can be absorbed by the movable jaws RI and R 2.

  The two movable jaws also allow the clamping of a pair of workpieces 21 and 22. It may also be taken into account a certain variation in length, due for example to cutting, since the movable jaws RI and R 2 can slide along the

  surfaces of the fixed jaw independently of one another.

  This is shown as a further example in Figure 5.

  The specialist will understand that the arrangement mentioned is only for the positioning of different workpieces in one direction

  which coincides with that of the beams or rails For a position-

  In the transverse direction of the beams, there are several types of cantilevered or protruding elements against which the parts can be placed before being clamped in the perpendicular direction.

  In a known manner, the fixed jaws, as well as the py-

  mobile ramids may be provided with groove-type guide projections or angle-fixing tools for cylindrical workpieces. In their upper part, the projections may also have a groove for use with thin workpieces, but these arrangements are The specialist will observe in the figures that the workpieces have been given a height such that they end partially between the beams 4 and 5. an example which illustrates a possibility that arises if the parts have a significant height and the fixing of the m Achoires

  in practice on beams with different rows of

Holes 14.

  A deep opening will also be taken into account.

  in the appended claims.

  The specialist will understand that steel is an appropriate material

  requested for the manufacture of movable jaws, as well as m Achoires

  fixed, and guide pins C, which are used for the position

  In the claims, consideration should also be given to

  9 - another hard material Less hard material may be needed

  re for protrusions if the finish of the workpieces is sensitive.

  The present invention provides a solution to the problem of reproducible attachment of workpieces for processing on numerically controlled machines and the like.

  This reduces the set-up and stalling times, resulting in a compression of the total processing time per part. The invention thus has a wide industrial utility.

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Claims (7)

  1 Fixing intended to allow the tightening of several parts   those to be machined (1) to be processed by machines such as   numerically controlled machines, of the type in which the clamping is effected   killed by means of jaws which are double-acting, one (F) having a fixed clamping surface and the other (R) being movable, and wherein the fixed jaws are fixed in rows in a known manner by example by means of tie rods (B), on beams (4, 5) or in rails in a frame, thus constituting a frame,   characterized in that in its portion facing the movable jaws   the, the fixed jaw (F) is shaped in the manner of a point of arrow.   che, or a part thereof, having flat sliding surfaces (7, 8) along which the movable jaw, which is divided into two parts (R 1, R 2) can slide in such a way that their front surfaces are displaced parallel to a direction substantially coinciding with that of the beams (4, 5), the displacement being executed in a known manner, for example by means of a screw (A) mounted between the movable jaws (R 1, R 2), while the positioning along the beams is guided by means of holes (14, 15) arranged equidistantly in the beams (4, 5) or a corresponding frame provided for the jaws, which holes have their correspmxatsldaws the fixed jaws (F), the positioning being performed by means of a   pin that passes through the jaw and the beam or the mount.   2 Fastening according to claim 1, characterized in that the sliding planes (7, 8) provided on the fixed jaw (F) are inclined with respect to the frame in such a way that the movable jaws (R1, R 2) are tight between the fixed jaw and the b Ati when a   Clamping force is applied to the mobile jaws.   3 Fixing according to claim 1, characterized in that   that the sliding planes (7, 8) provided on the fixed jaw (F) pre-   feel grooves such that the movable jaws (R 1, R 2), which have corresponding projections, are clamped between the fixed jaw and the frame when a clamping force is applied to it - the movable jaws.   4 Fastening according to claim 1, characterized in that the positioning of the fixed jaws along each of the beams is effected by means of at least two rows of holes (14) provided along them and at least two holes provided on each side of the fixed jaws, being arranged so that the holes (C) provided in the fixed jaws periodically cover the holes provided in the beams (4, 5), while a line (19) passing through two holes of a fixed jaw is intersecting with a line (18) passing through two holes of a beam.   Fastening according to Claim 3, characterized in that, on each side of the workpieces (1), two rows of holes (14) in the housing and three holes in the stationary jaws form the base for positioning, a pin (C) provided on each side guiding the fixed jaw into position before it is fixed (on the frame).   Fastener according to claim 1, characterized in that the amplitude (20) of displacement which is possible for the movable jaws is substantially greater than the smallest distance existing between the fixed jaws which can be obtained by the combination of   holes (C) provided in the fixed jaws and in the frame.   Fastener according to Claim 5, characterized in that the two movable jaws (R1, R2) can move independently of one another along the sliding planes (7, 8) when a clamping force is applied between them, for example at by means of a screw (A).   8 Fixing according to any one of claims 1 to   characterized in that on their faces facing the workpieces, the stationary jaws (F) and / or the movable jaws comprise   shaped packings to allow adaptation to the parts.