Classifications

• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B40/00—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
  • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
  • B23P15/24—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass dies
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
  • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
  • B23Q3/18—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for positioning only
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B2215/00—Press-moulding glass
  • C03B2215/71—Injecting molten glass into the mould cavity

Definitions

• the present invention relates to the manufacture of mould halves for use in the injection moulding of glass.
• neck rings The moulds for the manufacture of the neck region of glass bottles (hereinafter referred to as "neck rings") are generally cylindrical and comprise a male and a female mould half in which are formed the respective mould cavities that define, when combined together to form the mould, the shape of the product to be moulded.
• the mould halves have planar surfaces that contact along the longitudinal centre plane of the mould.
• the mould halves are manufactured to close tolerances.
• the close tolerances are necessary so that there is substantial contact over the surface area of the planar surfaces in order to ensure that there is no leakage of molten glass from the mould.
• the mould halves are constructed to interlock thereby to ensure that the mould halves are correctly positioned when brought together to form the mould.
• the mould halves are constructed so that the outer marginal sections of the male mould half project beyond the plane of the planar surfaces and the outer marginal sections of the female mould half are recessed with respect to the plane of the planar surfaces so as to receive the outer marginal sections of the male mould half.
• a mould half for use in injection moulding of glass said mould half having a mould cavity and comprising a planar surface adapted to contact a corresponding planar surface of another mould half along the longitudinal centre plane of a mould formed from the two mould halves, said method comprising:
• mould half (e) milling the planar surface of the mould half to the required dimensions measured with respect to the turned outer surface of the mould half. It is preferred that the mould half forms part of the neck ring for the injection moulding of bottles.
• a plurality of mould halves are positioned in the first and second jigs and are machined simultaneously.
• an apparatus for machining a mould half for use in injection moulding of glass comprising a planar surface adapted to contact a corresponding planar surface of another mould half along the longitudinal centre plane of a mould formed from the two mould halves, said apparatus comprising: (a) a first jig to receive and support the mould half so that a section of an outer surface of the mould half can be machined to the required dimensions measured with respect to a reference point on the first jig, and (b) a second jig to receive and support the partly machined mould half so that the planar surface of the mould half can be machined to the required dimensions measured with respect to the section of the outer surface of the mould half.
• the first jig comprises a plurality of compartments, each of which is adapted to receive and support a respective said mould half.
• the first jig comprises an elongate body having a flat upper surface and the compartments are defined by a plurality of plates extending from and spaced along the length of the upper surface. With such an arrangement it is preferred that the fiat upper surface defines the reference point.
• the first jig further comprises a plurality of spacer plates each assoc iated with one of said compartments and positioned on the flat upper surface, whereby in use the planar surfaces of the mould halves contact the spacer plates.
• the spacer plates comprise projections that in use extend into the mould cavities of the mould halves to so retain the mould halves in position on the spacer plates.
• the first jig further comprises a plurality of securing members to secure the respective said mould halves to the first jig.
• each securing member comprises a clamp pivotally mounted on one side to the upper surface of the first jig and movable from an open to a closed position at which the clamp extends around a section of the outer surface of the mould half and is releasably pinned on to the other side to the upper surface of the first jig.
• Figure 3 is an end view of the mould halves shown in Figures 1 and 2 positioned together to form the neck ring;
• Figure 4 is a perspective view of a first jig for receiving and supporting a plurality of the mould halves shown in Figures 1 to 3 for partial machining;
• Figure 5 is a section along the line 5-5 in Figure 4.
• Figure 5 is a section along the line 6-6 in Figure 5;
• Figure 7 is a perspective view of a second jig having a plurality of holders for receiving and supporting mould halves partially machined in the first jig for further machining;
• Figure 8 is a section of one side of one of the holders of the second jig showing in detail the location of a male mould half for machining;
• Figure 9 is a section of one side of one of the holders of the second jig showing in detail the location of a female mould half for machining.
• each mould half 3 comprises a curved outer surface 5, a planar surface 7, and a mould cavity 9.
• the outer surface 5 is formed with a central semi-circular groove 11 which separates two outer semi-circular sections 13.
• the neck ring It is an important requirement for the neck ring that the planar surfaces 7 are machined to close tolerances so that when corresponding planar surfaces 7 of two mould halves 3 are brought together to form the longitudinal centre plane P ( Figure 3) of the neck ring there is substantial contact between the planar surfaces 7 to prevent leakage of molten glass from the mould cavity 9.
• the mould halves 3 are formed to interlock.
• the outer sections 15 of the male mould halve 3a shown in Figure 1 project beyond the plane of the planar surface 7 and the outer sections 17 of the female mould half 3b shown in Figure 2 are recessed with respect to the plane of the planar surface 7, thereby to receive the projecting outer sections 15 of the male mould half 3a.
• Figures 4 to 6 is shown a first jig 19 for use in machining the rough as-cast mould halves 3.
• the first jig 19 comprises an elongate body 21 having a flat upper surface 23 and a series of plates 25 extending from and spaced along the length of the flat upper surface 23 to define therebetween compartments 27 to receive the rough cast mould halves 3.
• the first jig 19 further comprises a plurality of spacer plates 31 each positioned on the flat upper surface 23 of a respective compartment 27.
• the length and the width of the spacer plates 31 are selected to correspond closely with that of the planar surface 7 of the mould halves 3 so that in use the projecting outer sections 15 of the male mould members 3a extend part way down the sides 33 of the spacer plates 31.
• the thickness of the spacer plates 31 is selected so that the projecting outer sections 15 of the male mould halves 3a terminate short of the flat upper surface 23 of the first jig 19.
• Each spacer plate 31 further comprises a pair of pins 37 and a plate 39 which, when a mould half 3 is positioned on the spacer plate 31, extend into the mould cavity 9 of the mould half 3.
• the pins 37 and the plate 39 act to securely position the mould halves 3 onto the spacer plates 31.
• the first jig 19 further comprises a plurality of clamps 29 to secure the mould halves 3 and spacer plates 31 to the flat upper surface 23 of the first jig 19.
• Each clamp 29 is pivoted on one side 41 of the first jig for movement from one open position (not shown) to a closed position at which, as can be best be seen in Figure 5, the clamp 29 extends in the groove 11 of the mould half 3 and is pinned on the other side 43 of the first jig 19.
• a plurality of the as-cast mould halves shown in Figures 1 and 2 are positioned on the first jig 19 as described above with the planar surfaces 7 of the mould halves 3 contacting the spacer plates 31.
• the clamps 29 are moved to the closed position to secure the mould halves 3 and spacer plates 31 to the first jig 19, and the first jig is then positioned on a lathe (not shown) for machining.
• the first jig 19 positions each of the mould halves 3 so that the semi-circular sections 13 on the outer surface 5 of the mould halves 3 are turned on the lathe to the same spacing from a reference point on the first jig 19.
• the jig 51 comprises a plurality of holders 53 spaced along the length of an elongate base 55.
• the base 55 is formed to be positioned on a milling machine (not shown).
• Each holder 53 comprises a semi-circular cut-out section that is adapted to receive and support a mould half 3 and is defined by semi-circular surfaces 57.
• the dimensions of the semi-circular surfaces 57 are selected to correspond closely with the dimensions of the machined sections of the outer surfaces 13 of the mould halves 3 so that the mould halves 3 are snuggly supported by the second jig 51.
• the second jig 51 further comprises a plurality of slide members 59 to correctly position the mould halves 3 in the holders 53.
• the slide members 59 are positioned in grooves 61 formed in one side wall of the holders 53, and the end of each slide member 59 which is arranged to extend into the cut-out section is stepped and comprises a first surface 63 and a second surface 65.
• the measurement of the dimensions to which the planar surfaces 7 of the mould halves 3 must be machined in order to meet the tolerances required for the neck rings is independent of the initial dimensions of the as-cast mould halves 3 and thus the accuracy of the castings in terms of the initial dimensions is not as critical. As is described above, this is accomplished by using a fixed reference point on the first jig 19 as the basis for the measurement of the dimensions to which sections of the outer surface 5 of the mould halves 3 have to be machined, rather than using a given point on the mould halves 3.
• the outer surface 5 of the mould halves in effect becomes the reference point for the measurement of dimensions for the machining of the planar surfaces 7 and other sections of the mould halves 3.
• the method described above it is possible with the method described above to produce a plurality of mould halves machined to the same tolerances from rough castings, notwithstanding that there are variations in the initial dimensions of the rough castings.
• the first and second jigs 19, 51 to receive and support a plurality of mould halves 3 not only can a plurality of identically dimensioned mould halves 3 be reproduced but also the rate of production can be increased. In this regard, it has been found that 200 neck rings can be manufactured in an 8 hour shift using the five compartment jigs shown in the drawings.
• first and second jigs allow a single rough cast mould half to be machined without difficulty to a range of sizes and mould cavity configurations, with the variations in size only requiring minor recalculations of the basic dimensions and the use of sleeves to vary the dimensions of the cut-out sections of the second jig.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Jigs For Machine Tools (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)

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• 1987
  • 1987-03-16 WO PCT/AU1987/000073 patent/WO1987005551A1/en not_active Application Discontinuation
  • 1987-03-16 EP EP19870902030 patent/EP0306481A4/de not_active Withdrawn

Patent Citations (1)

Non-Patent Citations (1)

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