FR2514275A1 - MOLDING MACHINE WITH AUTOMATIC TOOL FIXING - Google Patents

Abstract

ON A PRESSURE CASTING MACHINE, IT IS PROVIDED, IN THE FIXED MOLD HOLDER PLATE 10 AND IN THE MOBILE MOLD HOLDER PLATE 18, HOLES 44 FOR RECEIVING LOCKING FINGERS 30, WHICH ARE LOCATED ON THE HALVES OF THE MOLD CASTING UNDER PRESSURE 22; THESE FINGERS HAVE RECESSES 40, IN EACH OF WHICH THE FREE END OF A LOCKING PIN SLIDELY FITTED IN A HOLE 46 PERPENDICULAR TO HOLE 44 PENETTS THE FREE END OF THE PIN. PRESSURE, WHICH ALLOWS A QUICKLY ASSEMBLY AND DISASSEMBLY OF A MOLD ON THIS MACHINE.

Description

The subject of the invention is a pressure molding machine which comprises

  a fixed mold carrier plate and a movable mold carrier plate for holding a fixed mold half and a mobile mold half, the latter being movable on clamping columns which

  join the fixed mold holder plate to a fixed counter plate.

  On the die-casting machines known up to now, the fixing of the mold halves on mold carrier plates is done, for example, using T-grooves, in which T-fastening elements are slid , which is then screwed into the base plate of the corresponding mold half, so that the latter is pressed against the mold carrier plate Another possibility of fixing the mold halves with the mold carrier plates is to provide on the latter, tapped holes to receive screws which allow the corresponding half of the mold to be screwed onto the mold holder plate. With this type of fixing of the mold halves, a mold change takes a long time, because the screwing of all the screws is quite long. Furthermore, the mold halves can only be mounted when cold, so that before disassembling the molds used, it is necessary to wait for them to cool, while after the assembly of a new mold, it again runs out for a certain time until

  the mold has reached its operating temperature.

  Anyway, the change of mold requires a stop

  long enough of the die casting machine.

  The main object of the invention is to achieve a pressure molding machine of the type defined above and improved, so that a change of mold

  is possible simply and quickly without an immobile lanyard

stabilization of this machine.

  This object is achieved according to the invention, thanks to the fact that on the mold halves there is provided in their faces facing the mold carrier plates at least two hooking fingers, while in the corresponding faces of the mold carrier plates receiving holes are practiced

  of these fingers Each of these holes is crossed by another-

  transverse hole containing a blocking pin movable in an axial direction and having a free end part capable of entering a blocking recess formed in the finger

corresponding attachment.

  With the solution provided by the invention, the

  mold change is extremely simple When you approach

  in the mold halves of the corresponding mold holder plate

  laying, all the hooking fingers penetrate at the same time into the receiving holes and they can also be locked there at the same time by a simple displacement of the locking pins, so that each mold half is clamped with its base plate, against the corresponding mold holder plate The loosening of one half of the mold and its corresponding mold holder plate is done in reverse order, by simply removing the locking pins. No screwing or unscrewing which takes time is necessary The mold can be removed without difficulty when it is still hot or can be mounted after being preheated, so that the machine stops due to

  mold change is minimized.

  The locking pins can be moved beforehand.

  each with a piston and cylinder actuator actuated by a fluid - under pressure The actuators are advantageously connected to the hydraulic circuit of the

  die casting machine and they can be action-

  born together by means of the same control device.

  So you can easily set the same value

  the blocking force of all cylinders.

  The cylinders are preferably fixed on the mold carrier plates, so that they are each part of the die-casting machine. But it is also possible to provide the receiving holes and the cylinders on an intermediate plate fixed to the mold carrier plate. This makes it possible to clamp on the machine both molds designed for a traditional fixing method as well as molds produced in accordance with the invention. Depending on the size and shape of the mold, a greater or lesser number of hooking fingers can be provided.

  and blocking cylinders; the fingers are fixed preferably

  rence on the mold and the receiving holes are preferably provided in the mold plate, preferably in pairs and symmetrically arranged with respect to the axis

longitudinal of the machine.

  The attachment fingers can be constituted by screws having suitable blocking recesses and which are screwed until they are locked in rotation on the base plate of the corresponding mold half. Thus, these fingers can be fixed on a new mold, when an old mold is no longer needed or when it is

become unusable.

  The blocking recess advantageously has on each catching finger a blocking surface oblique to the axis of the latter in order to cooperate.

  with a complementary surface of a locking pin.

  In this way, the force with which the mold half is pressed against the mold-carrier plate can be adjusted thanks to the more or less pushed introduction of the locking pin into the locking recess. This assembly also makes it possible to adjust and to control the clamping force by monitoring the stroke of a cylinder This is easily achieved, for example using limit switches arranged on the path of the piston rod

of the corresponding cylinder.

  A pressure molding machine according to the invention makes it possible to mount a mold in such a way that the mold halves are detachably fixed to a support which is itself mounted on the machine, so that

  the hooking fingers which are on the mold-are in the ali-

  gning of the receiving holes These fingers can therefore be introduced into the receiving holes by displacement of the movable mold-holder plate and be locked there by the locking pins. All that remains then is to separate the mold from the support. on the latter bayonet fastening elements which enter corresponding recesses provided on the mold halves and which can be locked with them by a simple rotation. With molds which can pass between the clamping columns of the die-casting machine, the support advantageously slides over the clamping columns

  machine upper; for that half bearings

  cylindrical are provided on the support But if the molds are large to the point that, for their installation it is necessary to remove the upper clamping columns or one of them,

  the support can be placed on the bench and slide there Special-

  ment, for fairly small molds, a lifting means, such as a hoist, can be placed on the fixed mold plate, with which the mold can be lifted and held during assembly.

  Other features and advantages of the invention

  tion will appear during the description which will be given

  now, without limitation, of an embodiment.

  Reference will be made to the appended drawings in which FIG. 1 is a schematic top view

  of the mold holder part of a press molding machine

sion according to the invention;

  Figure 2 is a front view of a carrier plate

  mold with several blocking cylinders, one of which is shown in section; Figure 3 is a top view of the plate of Figure 2, in the direction of arrow A; Figure 4 is a detailed sectional view of a cylinder and a hooking finger shown in the locking position; Figure 5 is a detailed sectional view similar to Figure 4, of an alternative embodiment, Figure 6 is a schematic sectional view along 6-6 of Figure 1; Figure 7 is a sectional view which corresponds to Figure 6, showing a mold resting on the bench of the

machine.

  In Figure 1, we recognize, drawn diagrammatically

  tically, the mold-carrying part of a pressure molding machine, comprising a fixed mold-carrying plate 10, which is connected by a machine bench 12 (FIGS. 6 and 7) as well as by other horizontal clamping columns 14 to a counter plate 16 Between the counter plate 16 and the fixed mold carrier plate 10 is a movable mold carrier plate 18, which is slidably mounted along the four clamping columns 14 The movement and closing mechanism serving to displacement of the movable mold-carrying plate 18 is represented only by a hydraulic cylinder 20 It is naturally possible to provide at this location any kind of

known closing mechanism.

  Between the movable mold-carrier plate 18 and the fixed mold-carrier plate 10, it is recognized, in FIG. 1, a die-casting mold 22, comprising a movable mold half 24 and a fixed mold half 26 The mold 22 is suspended, for its mounting, has a cross member 28 which is, for its part, movably mounted on the upper clamping columns 14 of the die casting machine. The purpose of this suspension of the mold 22 from the cross member 28 will be described below with more precision, when explaining the

  mounting method of the die casting mold 22.

  Each mold half 26 includes a number of hooking fingers 30, which are fixed by screws 32

2 5 1 4 2 7-5

  and locked in rotation on a base plate 34 of the corresponding mold half, so that their axis is oriented parallel to the longitudinal axis 36 of the machine, on

  the corresponding mold holder plate 10 or 18 In the pre-

  for example, the base plate 34 of the corresponding half of the mold is essentially square; the same attachment finger is located at each corner of the square The attachment fingers 30 are arranged symmetrically in pairs with respect to the longitudinal axis 36 of the machine They are inserted in countersinks 38 formed in the surface of the

  base plate 34 facing the corresponding mold carrier plate

  laying. Each attachment finger 30 has a recess whose end surface 42 near the free end

  of this finger is oblique to the axis of the same finger.

  The reason for this surface 42 will be explained later.

  The hooking fingers 30 are intended to be

  wager in holes 44, made in the corresponding mold carrier plate 10 or 18, on the side facing the mold half, parallel to the longitudinal axis 36 The centers and diameters of the holes 44 correspond to the centers and

  diameters of the hanging fingers 30.

  Perpendicular to each bore 44, there is provided in the corresponding mold holder plate 10 or 18, a

  hole 46 which, from a side wall 50 oriented perpetually

  specifically to the clamping surface 48 of the support plate

  mold 10 or 18, extends in the direction of bore 44, which it cuts In this hole 46 is guided a locking pin 52 (see especially Figures 4 and 5), the free end of which enters the recess 40 of the hooking finger 30 corresponding To this end, the locking pin 52 has at its free end an oblique surface 55 (FIG. 4), complementary to the surface 42 of the hooking finger 30 and whose action is that at the time of the introduction of the locking pin 52 into the recess 40, the hooking finger 30 is driven in the bore 44, so that the corresponding mold half is pressed against the clamping surface

  48 of the corresponding mold holder plate.

  The displacement of the locking pin 52 is ensured each time by a hydraulic cylinder 54 with double

  effect, the piston 56 of which is joined to the locking pin 52.

  The cylinder 54 is fixed by means of a flange on the surface

  corresponding side 50 of the plate-u Dule-corres-

  laying, as can be seen in Figure 2.

  The cylinders 54 are connected by pipes

  58 to a common source of pressurized fluid not shown

  tee, so that they can be operated together and at the same pressure So all the hooking fingers can

  be locked or unlocked at the same time.

  On the side of each piston 56 opposite the locking pin 52 is a piston rod 60, which comes out of the

  cylinder 54 On the path of this rod 60, and outside, -

  laughing of the jack 54, there are limit switches 62, 64, which monitor the stroke of the piston 56 and therefore of the locking pin 52 Thanks to the adjustment of the stroke of the latter and of the piston 56, it is possible to adjust the force with which the corresponding mold half is clamped

  against the corresponding mold holder plate.

  FIG. 2 represents a mold carrier plate comprising a large number of bores 44 and 46, the latter being indicated only by their axes. Depending on the size and shape of the mold to be clamped, provision may be made at each of these locations. or even only at a part of these places, a cylinder 54 and a corresponding locking pin 52 But in general it will be ensured that the cylinders are always arranged symmetrically with respect to the longitudinal axis 36 of the pressure molding machine Sur Figure 2 the other cylinders 54 have not been drawn, for more - clarity of the drawing. The embodiment illustrated in FIG. 5 is

  distinguishes from that of FIG. 4 by the fact that the hollow

  ment 40 a of each hooking finger 30 a the complete cross

  tally, so that the locking pin 52 a can also pass through the finger 30 a through its free end. This makes it possible to choose a smaller angle of inclination between the locking surfaces 42 a and 54 a on the one hand and the axis of the bore 46 on the other hand, We thus obtain, for the same stroke of the locking pin 52 a, a finer adjustment of

the clamping force.

  Referring to Figures 1 and 6, we will now explain a first method of mounting the casting mold

  under pressure 22 on the pressure molding machine.

  This mold 22 is removably attached to the crosspiece 28 using suspension rods 66 These rods pass through

  the cross member 28 from top to bottom; the free end of each -

  rod-enters a recess 68 formed in the corresponding mold half 24 or 26 The rod 66 locks

  then in the recess 68 thanks to a mounting of the type with ba Ion-

  net For the correct orientation of the corresponding mold half 24 or 26 relative to the cross member 28, it

  a centering pin 70 is also provided each time.

  The cross member 28 is placed on the upper clamping columns 14 e so that it can slide thereon by means of bearings 72. This assumes that the mold 22 is capable of being introduced from above between the columns of upper clamping 24 If necessary, it is also possible to install the cross member 28

  first on the clamping columns 14 and then of intro

  mold mold 22 between these upper and lower columns

  and to lock it on the cross member 28 When the cross member 28 correctly occupies its position on the upper clamping columns 14, the mold 22 is also planed in the sense that the corresponding hooking fingers 30 are in alignment with the holes receivers 44 At this time, we

  moves the movable mold carrier plate 18 by means

  closing tif 20, towards the fixed mold carrier plate 10, until the hooking fingers 30 penetrate into the holes 44 and the mold halves 24 and 26 ï with their corresponding base plate 34, are against the clamping surface 48 of the corresponding mold carrier plate 10 or 18 A pressure chamber 74 fixed to the fixed mold half 26 penetrates into a corresponding bore 76 of the fixed mold carrier plate 10 All the blocking cylinders 54 are then actuated by a common control, while the mold halves 24 and 26 are pressed against the mold plate

  corresponding to the introduction of the pins of-

  blocking 52 in the recesses 40 The bayonet locking means 66, 68 are released, after which the crosspiece

28 can be withdrawn.

  The essential advantage of the assembly provided by the invention is that the mold is planed automatically when

  the cross rests on the upper clamping columns.

  The clamping of the mold halves on the mold carrier plates takes place very quickly The mold halves loosen from the mold carrier plates just as quickly, in the reverse order of the operations described above. heat the mold 22 and heat tighten it so that the molding process is interrupted only a little

of time.

  It will also be noted that with small molds, the mold 22 attached to the crosspiece 28 can be moved by hand, until the hooking fingers 30 enter the

bores 44.

  Figure 7 shows an alternative embodiment useful in the case where the external dimensions of the mold are greater than the distance between the clamping columns, which requires removing the upper clamping columns to put the mold in place In this case, the mold is deposited on a cross member 78, which extends perpendicular to the machine bench 12 and which slides, at its ends, on

  bench 80 rules Here too, the mold can still be posi-

  tiated using the crosspiece, the crosspiece 78 can either remain in the machine as a mold support, or be removed from it. This mounting mold can also be used when the mold has core pullers, so that at the time of mounting

  at least one of the upper clamping columns must be removed

laughing.

  For molds that have not been made primi-

  According to the invention, individual plates can be used.

  intermediaries each joined securely to a corresponding half-mold, these plates being fitted with fingers and

  cylinders according to the invention.

Claims (11)

  1 die-casting machine, comprising a fixed mold carrier plate and a movable mold carrier plate for holding a fixed mold half and a movable mold half, the movable mold carrier plate being movable on clamping columns which connect the fixed mold carrier plate to a fixed counter plate, characterized in that, on the surfaces (34) of the mold halves (24,26), surfaces facing the mold carrier plates ( 10,18), at least two hooking fingers (30) are provided, while in the clamping surfaces of the mold carrier plates (10, 18), holes (44) are received for receiving these fingers ( 30), each receiving hole (44) being cut by a corresponding hole (46) drilled in the lateral surface (50) of the mold plate (10,18), each of these holes 146) containing a locking pin (52) sliding in the axial direction and able to penetrate through its free end, when the mold is tightened,   in a blocking recess (40) formed in the contact finger spitting (30).   2 pressure molding machine according to claim 1, characterized in that the blocking recess (40) formed in the fixing finger (30) has a blocking surface (42) oblique to its axis intended to cooperate with an additional blocking surface   (55) provided on the locking pin (52).   3 Die casting machine according to one   any of claims 1, 2, characterized in that   the locking pin (52) is movable by means of a   cylinder (54,56) actuated by a pressurized fluid.   4 pressure molding machine according to claim 3, characterized in that the cylinders (54,56) are   mounted on the mold carrier plates (10,18).   Pressure molding machine according to claim 3, characterized in that the receiving holes (44)   and the jacks (54,56) are arranged on an intermediate plate   diary which can be fixedly joined to the plates mold holder (10,18).   6 Die casting machine according to one   any one of claims 3 to 5, characterized in that   the cylinders (54,56) can be actuated together by the in-   through a common control device.   7 Die casting machine according to one   any one of claims 1 to 6, characterized in that   the hooking fingers (30) fixed to the mold (22) and the receiving holes (44) formed in the mold carrier plates (10, 18) are arranged symmetrically in pairs relative to   the longitudinal axis (36) of the machine.   8 Die casting machine according to one   any one of claims 1 to 7, characterized in that   the hooking fingers (30) are screwed and locked in rotation on the corresponding base plate (34) of the halves de-mold (24,26).   9 Die casting machine according to one   any of claims 3 to 8, characterized in that   limit switches on the piston rod (60) trajectory of each cylinder (54,56)   (62,64), for controlling the travel stroke.   Pressure molding machine according to one   any one of claims 1 to 9, characterized in that,   on the fixed mold carrier plate (10), a lifting device is provided for lifting and holding the mold (22) in its mounting position.   11 Molding machine according to any one of   Claims 1 to 10, characterized in that the halves of   mold (24,26) are removably attached to a crosspiece (28,78) which is arranged on this machine so that the hooking fingers (30) which are on the mold (22) are aligned with the receiving holes (44) and that these same fingers penetrate into these receiving holes (44) following the movement of the movable mold-carrying plate (18) and are locked by the locking pins (52), which makes it possible to remove then the connection between the mold (22) and the sleepers (28.78).   12 molding machine according to claim 11, characterized in that the crosspieces (28) are slidably mounted on the upper clamping column (14) of this machine.   13 molding machine according to claim 11, characterized in that the crosspiece <78) is mounted   sliding on the bench (12) of this machine.