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
  • B29C33/00—Moulds or cores; Details thereof or accessories therefor
  • B29C33/30—Mounting, exchanging or centering
  • B29C33/301—Modular mould systems [MMS], i.e. moulds built up by stacking mould elements, e.g. plates, blocks, rods
  • B29C33/302—Assembling a large number of mould elements to constitute one cavity
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B28—WORKING CEMENT, CLAY, OR STONE
  • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
  • B28B7/00—Moulds; Cores; Mandrels
  • B28B7/02—Moulds with adjustable parts specially for modifying at will the dimensions or form of the moulded article
  • B28B7/025—Moulds with adjustable parts specially for modifying at will the dimensions or form of the moulded article the mould surface being made of or being supported by a plurality of small elements, e.g. to create double curvatures
• • 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
  • B29C33/00—Moulds or cores; Details thereof or accessories therefor
  • B29C33/30—Mounting, exchanging or centering
  • B29C33/308—Adjustable moulds

Definitions

• the present invention relates to an adjustable mould consisting of matched mould members.
• the invention also relates to an object which is manufactured by using the said adjustable mould.
• the most remarkable among the advantages of the present invention is the fact that the mould expenses are decreased.
• the same mould or parts thereof can be used in the manufacture of several different castings or other such pieces.
• the adjusting of the mould is a simple procedure, and it can be automated.
• the mould is suited to be employed with considerably smaller production series while making castings or other such pieces than the currently used moulds.
• the adjustable mould according to the invention is particularly well suited to be used in plastic industry, specially in the series production of packages or protective shells made of polystyrene or other such light cellular plastic.
• the manufacturing of a complex mould becomes unnecessary, and consequently the delivery times of such packages are remarkably shortened.
• the surface of the package if formed of protruding, step-like surface elements, which offer several pneumatic points of support for the product to be packed.
• the produced package is extremely well suited for its respective purpose.
• Figure 1 is an illustration of an adjustable mould according to the invention, seen from the top, a, and seen in cross-section along the line A-A, b;
• Figure 2 is an illustration of a mould element, seen in lengthwise cross-section, a, and seen from the top, b.
• the adjustable mould consists of two mould members: the first, i.e. the female mould member 1, and the second, i.e. the male mould member 2, which are matched with each other. In between the two, the proper casting or other such piece is manufactured.
• the male mould member 2 comprises the frame 3 and a number of mould elements 4.
• the mould elements 4 fill up the inner part of the frame 3.
• the frame 3 is also provided with the flange 3a, where the respective flange la of the female mould member 1 is fastened for instace by means of screws.
• the female mould member 1 also comprises a frame lb, which has a shape corresponding to the frame 3 of the male mould member 2.
• the frame 3 of the male mould 2 can be fitted within the frame lb of the female mould 1, advantageously against the shoulders lc thereof.
• the female mould 1 is provided with the front plate 21, which comprises the aperture 22 for a filling pistol or equivalent device.
• the locking plate 11 covers the whole of the back part of the frame 3. On top of it, there also is adjusted the back plate proper 20.
• the mould elements 4 are elongate or rod-like members which are slidably interfitted at the sides 5. They have a regular shape in cross-section - in this case they are quadratic as is seen in figure 2b, and their dimensions are 10 x 10 mm. Their length may vary for example between 10 - 30 cm.
• the mould elements 4 are positioned within the box-like frame 3 lengthwise against each other in an overlapping fashion, at right angles with respect to the whole frame 3. They can also be moved in a direction transversal to the frame, their position can be adjusted and they can be locked into place for instance by means of the frame 3.
• the mould element 4 is additionally provided with the recess 6, as is seen in figure 2a. It is connected, by means of the channels 7 and 8, to both ends 9 and 10 of the element 4 respecti ely.
• This recess 6 is part of the cavity or boring 14, which is made in the direction of the lengthwise axis B-B of the element 6, at the other end 10 thereof.
• the mouth opening 10' of the boring 14 is provided with a threading 15, whereinto there is fitted an adjusting screw 12 or other similar adjusting device.
• the adjusting screw 12 passes through the opening 13 located in the locking plate 11 so that the head 16 or other such holding member of the adjusting screw 12 remains on the opposite side of the locking plate 11 with respect to the mould element.
• the opening 13 corresponds to the cross-sectional area of the adjusting screw, or is somewhat larger than that.
• the diameter of the head 16 of the adjusting screw 12 is larger than the diameter of the aperture 13 at least in one direction, and the said head 16 is embedded in the locking plate 11.
• the mould elements 4 are locked into place by suitably pressing them together.
• the frame 3 of the male mould 2 is provided with a special tightening ledge 17.
• This ledge is a tightening hoop or equivalent member which is fitted into one or several grooves 18 of the frame and follows and conforms to its inner edge, and it can be lengthened or shortened for example by means of an adjustable screw.
• the adjustable mould of the invention is manufactured in the following fashion. According to models, the box-like and often polygonal frames lb, 3 of the moulds 1, 2 are constructed. In the grooves 18 located in the frame 3 of the male mould 2, there is placed a tightening ledge 17 of a suitable length.
• the locking plate 11 is provided with- perforations, where the distances between the openings 13 or holes are regular and depend on the cross-sectional area of the mould elements 4, i.e. of the distances between the central points of the mould elements.
• a piece which can be matched into the opening 13 in the frame 3 is cut off the locking plate 11 of the above description, and the said piece is fitted in the frame 3.
• the adjusting screws 12 Into the openings 13 of the locking plate 11, which openings are located inside the frame 3, there are installed the adjusting screws 12, whereafter the mould elements 4 are fastened to the adjusting screws.
• the male mould 2 is provided with a back plate 20 of a suitable size.
• the adjustable mould is made ready for operation so that the back plate 20 is taken off the mould and the tightening ledge 17 is loosened. Now the mould elements 4 can move freely within the limits set by the lengths of the adjusting screws 12.
• the template is placed in the filling space 23.
• the mould elements 4 are pressed against the template, whereafter the screws 12 are lightly fastened to the locking plate 11, and the back plate 20 is fixed into place.
• the tightening ledge 17 is tightened, so that the mould elements are pressed tightly and firmly against each other. Now the mould is ready for operation.
• the adjustable mould according to the invention can be employed particularly in the manufacture of polystyrene packages and protective shells.
• Underpressure is arranged in the empty space 24 of the male mould 2 corresponding to the filling space 23 for instance by sucking air from the mould through another opening made in the locking plate 11 and the back plate 20, in which case underpresssure is simultaneously created also in the filling space 23 through the recesses 6 and channels 8, 9 of the mould elments 4.
• the gases and vapours created in the mould filling stage are discharged from the filling space 23 through the said channels 8, 9 and recesses 6. Moreover, through the said paths 6, 8, 9, cooling water can be conducted up to the surface of the object formed in the filling space.
• the front plate 21 is dismantled. Into the space 24 there is conducted pressurized air, which flows through the paths 6, 8 and 9 of the mould elements 4 and effects the object located in the filling space by pushing it out of the mould. The mould is cleaned, whereafter it is immediately ready for a successive filling.
• An object manufactured by employing the adjustable mould of the invention has a special surface structure.
• the arched surfaces of the said object are provided with steplike bulges or protruding surface elements. Their area
• each mould element can be provided with a uniform groove or boring which is for instance round in cross-section. In the said boring, straight bars can be installed instead of the adjusting screws, and these bars penetrate the locking plate, where they can be locked after adjusting the position, for example by pressing them into place by means of another locking plate.
• both mould members both the female and the male mould member, may contain other adjustable mould elements.
• the frames of the mould elements are manufactured of a relatively thin aluminium profile or equivalent, which frames can then suitably be joined for instance on top of each other in order to make sure that the mould becomes sufficiently deep.
• the adjustable mould is used for manufacturing for instance polystyrene packages, the frame itself may be simply quadratic, and its appearance does not necessarily have to be in any ways connected to the appearance of the product to be packed.

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

Applications Claiming Priority (1)

Publications (1)

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Family Applications (1)

Country Status (2)

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• 1984
  • 1984-11-05 EP EP19840904132 patent/EP0199720A1/de not_active Withdrawn
  • 1984-11-05 WO PCT/FI1984/000081 patent/WO1986002877A1/en not_active Ceased

Non-Patent Citations (1)

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