Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/1761—Means for guiding movable mould supports or injection units on the machine base or frame; Machine bases or frames
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/1761—Means for guiding movable mould supports or injection units on the machine base or frame; Machine bases or frames
  • B29C2045/1765—Machine bases
  • B29C2045/1767—Machine bases connecting means for machine base parts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/1761—Means for guiding movable mould supports or injection units on the machine base or frame; Machine bases or frames
  • B29C2045/1768—Means for guiding movable mould supports or injection units on the machine base or frame; Machine bases or frames constructions of C-shaped frame elements

Definitions

• the present invention relates to a plastic injection press, of the type described in the preamble of claim 1.
• the invention aims to solve the problem of maintaining the parallelism of the two mold carrier plates in a particularly economical and effective manner.
• the subject of the invention is an injection press of the aforementioned type, characterized by the characterizing part of claim 1.
• the injection molding machine according to the invention can include one or more of the features of claims 2 to 23.
• FIG. 1 is a schematic side view of an injection press according to the invention
• FIG. 2 schematically illustrates, on a larger scale and with exaggeration, the deformation phenomena which occur during the injection phase
• Figure 7 is a view similar to Figure 1 which shows another embodiment of the press according to the invention.
• FIG. 8 shows in perspective another embodiment of the suspended flange for the press according to the invention.
• FIG. 9 is an end view of a variant of the flange of Figure 8, on a smaller scale
• FIG. 10 shows in perspective a variant of the press of Figure 7, using two flanges similar to that of Figure 8;
• FIG. 11 is a similar view of another press according to the invention.
• the injection press shown in FIG. 1 comprises:
• the mold is shown in the closed position in FIG. 1.
• the box spring 4 carries a actuator body 11, the assembly 12 of which forms a piston rod is connected to the movable plate 3.
• carriages 203 with recirculating balls can be mounted between the underside of the plate 3 and the slides 8.
• Each flange 6 has a generally U-shaped.
• the branches of the U have, on the inside, a profiled notch 13, so that the end portions 14 of the two branches of the U, adjacent to these notches, are directed towards one another.
• These end parts are fixed to support cross members 15 projecting from the side provided on the upper part of each fixed plate 2, 4.
• Each part 14 may also have a recess 16 in its upper face, as shown.
• each flange 6 is cut so as to define a tongue 17 of converging shape having a generally vertical direction, directed upwards, and, on the front or interior side of this tongue, an opening 18.
• the front face of each tongue is flat and vertical at least in its free end region 19, and an oblique slot 20 runs along the rear or outside side of the tongue.
• Each fixed plate 2, 4 has in its lower region two projecting lateral cross members 21 each of which has a vertical rear face 22 which is applied, by simple support plane on plane, on the region 19 of the associated tongue 17.
• each flange can be carried out by fixing the crosspieces 21 on the tabs 17, with the crosspieces 15 in rear-to-plan support on the end portions 14 of the U, along respective vertical surfaces 23, 24.
• provision can be made to fix each flange both on the crosspieces 15 and on the crosspieces 21.
• the main axis XX ′ of the press defined by the centers of circular cutouts 102, 103 of the plates 2 and 3 which serve to center the half-molds 7, is at one level. intermediate calf of the U-shaped branches. It constitutes the injection axis, the injection taking place through the cutout 102, and coincides with the central actuation line of the jack 11-12.
• the cylinder 11-12 has closed the mold and applies along the axis XX 'the locking force which makes it possible to balance the high injection pressure of the plastic material, there is a displacement of the plate 4 to the left of FIG. 1. This displacement is strictly parallel to the axis XX ′, without any tendency for one plate to tilt relative to the other.
• the plate 4 is guided in sliding by its lower part by the slide 9, and the force is applied on the end faces 24 and on the upper regions 19 of the tongues 17.
• Figure 2 illustrates, with a strong exaggeration, the deformations of the right part of the flange. Analogous elastic deformations occur simultaneously in the left-hand side, considering FIG. 1, of the flanges, that is to say on the side of the bed base 4.
• the variant of FIG. 3 differs from the previous one in that the tongues 17 are directed downwards and have a front support side inclined downwards and backwards, at least in their free end region 19
• the crosspieces 21 have a rear support surface 22 correspondingly inclined.
• the notches 13 can have a simple shape, in particular roughly semi-circular as shown in FIG. 3.
• each tongue 17, directed downwards, is located on the inner side of the branch of the corresponding U, which gives it a general shape in C.
• the front bearing face 19 of the tongue is vertical and coplanar with the upper bearing surface 24.
• the notch 13 connects the bearing surfaces 19 and 24.
• the rear side of the tongue is convex and delimited by an arcuate slot 20, which ends, in the region of the axis XX ′, by a substantially circular opening 25 for stress relief.
• an intermediate piece 26 of elastic compression having a predetermined elastic modulus, can be placed in the slot 20 to perfect the control of the rearward movement of the zone of support 19.
• This intermediate piece may for example be a longitudinally compressed bar (FIG. 5) or a ring (FIG. 6).
• the bed base 4 can be fixed to the frame and the plate 2 can be slidably mounted thereon.
• each of the two fixed plates 2, 4 can be slidably mounted on the frame.
• the injection press shown in Figure 7 differs from that of Figure 1 in that the flanges 6 are placed or fixed on feet 27 themselves placed or fixed to the ground.
• the supports 28 may consist of rails, columns or any other similar element.
• the two flanges 6 constitute the only frame elements of the press.
• the guidance of the movable plate is provided by two members 28 which do not undergo any deformation when unlocking the closure of the mold, which makes this guidance precise and reliable.
• the flanges can, as shown, be largely visible at 30 in their central region, which is subjected to low stresses in service.
• the lights 30 serve on the one hand to lighten the flanges without reducing the mechanical performance, and on the other hand to evacuate the molded parts after opening the mold.
• the flange 106 shown in Figure 8 differs, in essence, from that of Figure 1 by removing the cutouts which define the tongues 17 and the openings 18.
• the lower bearing surfaces 19 are vertical and parallel to the surfaces d 'upper support 14. They are provided, on each side, on an auxiliary rectangular plate 31, fixed by its only lower region on the internal face of the latter, for example, as shown, with the interposition of a spacer plate 32.
• Each plate 31 has under its surface 19 a notch 33 similar to the notch 13 and which allows the elastic displacement of the surface 19 parallel to itself during injection.
• the spacers 32 can be replaced by an extra thickness 132 of the lower region of the plates 31.
• Figure 10 shows a press similar to that of Figure 7 but equipped with two flanges 106.
• the projections 15 and 21 of the end plates are eliminated.
• These trays have a lower part 34 of reduced width which is inserted between the flanges 106 and bears on the surfaces 19, while the current part of the same plates, of greater width, bears directly on the upper faces 24.
• the flanges 106 and their plates 31 are fixed to feet 127 fixed or placed on the ground which carry the entire press, as in FIG. 7.
• the upper part of the feet 127 can possibly form the spacers 32
• the guidance and the support of the movable plate 3 are obtained in a similar manner to FIG. 7. More precisely, two columns 128 are used for this purpose, fixed to the fixed plate 2 and sliding in the other fixed plate 4, these columns passing through conjugate lower orifices 35 of the plate 3.
• the plate 3 also has a narrowed lower part 34, disposed between the two flanges 106.
• This plate like the plates 2 and 4, thus has a running part wider than the interval which separates the two flanges, which allows larger molds to be accepted.
• an injection frame 36 intended to carry the injection device for the press (not shown), which is in the form of a square.
• This chassis 36 is rigidly fixed, on one side, to the underside of the fixed plate 2, thus ensuring the precise positioning of the injection device relative to the closing device 5.
• the chassis 36 is placed on the ground by two feet 37, which are the only feet of this chassis.
• the frame 36 comprises, in addition to the two outer legs 37, two inner legs 38, and is placed or fixed to the ground;
• the fixed plate 2 is fixed on the chassis 36 and is therefore carried by the latter;
• the feet 127 on the chassis side 36 are omitted, and the flanges 106 are, on this side suspended from the plate 2, by the regions 24 and 19, and free relative to the chassis 36.
• the support and guide elements 28 (FIG. 7 ) or 128 ( Figures 10 and 11) can be fixed to said assembly at one end and, at the other end, slide into openings 29 of the other fixed plate.
• the plates 31 can be fixed on the external face of the flanges 106.

Landscapes

• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)

Applications Claiming Priority (5)

Publications (1)

Family

ID=26213314

Family Applications (1)

Country Status (3)

Families Citing this family (3)

Family Cites Families (9)

• 2002
  • 2002-12-26 WO PCT/FR2002/004568 patent/WO2003055662A1/fr not_active Ceased
  • 2002-12-26 EP EP02801180A patent/EP1458542A1/de not_active Withdrawn
  • 2002-12-26 AU AU2002364881A patent/AU2002364881A1/en not_active Abandoned

Non-Patent Citations (2)

Also Published As

Similar Documents

Legal Events