Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
• • 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
  • B29C45/16—Making multilayered or multicoloured articles
• • 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
  • B29C45/16—Making multilayered or multicoloured articles
  • B29C2045/1696—Making multilayered or multicoloured articles injecting metallic layers and plastic material layers

Definitions

• the present invention relates to a method for producing a composite body from a first component and a second component and comprising the steps that one of the components is injected into a first mould cavity and permitted to set there, that the second component is injected into a second mould cavity which is at least partly defined by the just set component, whereafter the second component is permitted to set, and that the composite body is removed from the second mould cavity.
• the present invention also relates to an apparatus for producing a composite body of metal and plastic and comprises a die casting machine of the hot chamber type with a tool and a control system for controlling its working cycle.
• composite bodies consisting of two different materials, for example two different plastic materials or one plastic material and one metal or metal alloy.
• manufacture is often put into effect such that the part of the composite body consisting of metal is produced as a separate unit by a die casting process.
• the metal part produced in this manner is then placed in an injection moulding tool, whereafter the plastic is injected in and adheres to the metal part placed in the tool.
• the manufacture of a composite body in this manner in other words first the production of a metal part which is then placed in an injection moulding tool, is circumstantial and time-consuming. Further, advanced picking or robot equipment is required for placing the metal part in the injection moulding tool where the final inj ection of the plastic material takes place.
• Japanese Patent Application No. 5063316 discloses how a composite body consisting of metal and plastic may be manufactured in the same machine.
• the injection of metal takes place in a first mould cavity, whereafter the injected metal is allowed to set.
• the mould is opened and the metal part remaining in the one mould half is moved so as to cooperate with a new tool part which, together with the manufactured metal part, forms a second mould cavity in which the plastic is injected.
• the present invention has for its object to formulate the method intimated by way of introduction such that it obviates the drawbacks inherent in the prior art technology.
• the present invention has for its object to formulate the method so that it may be put into effect at high capacity without unnecessary waiting times in one and the same machine and possibly also in one and the same tool.
• the present invention further has for its object to design the apparatus intimated by way of introduction so that it obviates the drawbacks inherent in prior art technology.
• the present invention has for its object to design the apparatus such that it permits high capacity output manufacture, superior precision and low cost.
• the present invention has for its object to design the apparatus so that manufacture may be put into effect without unnecessary waiting times and with a continuous uniform quality in the manufactured products.
• Fig. 1 is an extremely schematic top plan view of a die casting machine of the hot chamber type
• Fig. 2 shows a tool part fixedly disposed in a die casting machine
• Fig. 3 shows a tool part moveably disposed in a die casting machine.
• metal will be employed in both the body of the specification and in the appended Claims.
• the expression “metal” is to be inte ⁇ reted so broadly as to encompass, on the one hand, pure metals and, on the other hand, alloys of two or more metals.
• the expression is taken to signify conventional casting alloys, principally based on zinc and aluminium.
• plastic will be employed below. This expression is to be inte ⁇ reted so broadly as to encompass all types of plastic materials which possess the property of being capable of being injection moulded.
• Fig. 1 shows from above and highly schematically a die casting machine 1 of the hot chamber type.
• the die casting machine has a fixedly disposed clamping table 2 and a moving clamping table 3. Under the action of a suitably designed mould closure device, this moving clamping table is reciprocally moveable in accordance with the double-headed arrow 4 towards and away from the fixed clamping table 2. Further, the die casting machine has a control system which controls its working cycle.
• Fig. 1 shows how there is disposed, in the die casting machine, a two-part tool with a first tool part 5 on the fixed clamping table 2 and a second tool part 6 on the moving clamping table 3.
• Both the first and the second tool parts may be constructed from a number of plates, where reference numerals 7 and 8 relate to fixing plates by means of which the tool parts are secured on the clamping tables 2 and 3, respectively.
• the second tool part 6 is composed of an additional number of plates.
• the most proximally located plates in Fig. 1 in both of the tool parts 5 and 6 may be designated mould plates 9 and 10, respectively and have surfaces 11-13 which are intended to define mould cavities wherein the manufacture of the composite body takes place.
• the surfaces 11 and 13 will together define a first mould cavity, while the surfaces 12 and 13 will together define at least a part of a second mould cavity.
• the die casting machine further displays, in association with the fixed clamping table 2, an infeed gate or channel 14 for molten metal and a container or melting pot 15 for melting, warming and storing the molten metal.
• the apparatus For the injection of molten or plasticized plastic in the above described tool 5, 6, the apparatus according to the invention has an injection device 16 for plastic. This is reciprocal in accordance with the double-headed arrow 17 so far that the nozzle 18 of the injection device can be applied against the tool 5, 6 in order to inject the plastic therein.
• the injection device 16 may be of a type which is conventional in injection moulding machines for plastic and is controlled by the control system of the die casting machine 1, principally in respect of time, but also in respect of other operational parameters.
• the fixed mould plate has guide pins 19 which are insertable in corresponding apertures in the moving mould plate 10 and possibly also in an intermediate plate 20 disposed behind it.
• both of the tool parts are held reliably centred in relation to one another and also, as will be apparent below, in relation to the moving mould plate 10 in an accurately defined position around an axis of rotation 21.
• the moving clamping table 3 is moved towards the fixed clamping table 2 so far that the two tool plates 9 and 10 are urged against one another. Thereafter, a quantity of molten metal is withdrawn from the melting pot 15, passed through the infeed gate or channel 14 under the action of a piston and via a pouring head to the mould cavity which is defined by the surfaces 11 and 13 where casting of the metal part included in the composite body takes place.
• the tool is opened whereafter the moving mould plate 10 is rotated through 180° so that the cast metal part is displaced from position I to position II in the tool. This implies that the cast metal part, after the rotation of the moving mould plate 10, is located at the right- hand surface 13 illustrated in Fig. 1.
• the tool is once again closed, whereafter the injection device 16 for plastic is moved forwards to the plane of division between the two mould plates 9 and 10 where injection of plastic takes place in position II.
• the mould cavity which here serves for moulding of the injected plastic is defined by surfaces on the previously cast metal part, possibly surfaces on the front surface of the mould plate 10 around the surface 13, and in addition by the surface 12 on the fixed mould plate 9.
• the moving mould plate 10 After removal of the finished composite body, the moving mould plate 10 is rotated through 180° back to the starting position, which implies that the second, cast metal part will now be in position II. Thereafter, the tool is closed and a new injection of plastic takes place in position II, whereafter the tool is opened and the second composite body is removed, and so on.
• Figs. 2 and 3 show mutually facing sides of the fixed and moving mould plates 9 and 10, respectively.
• the fixed mould plate 9 is seen in a direction from above and downwards in Fig. 1
• the moving mould plate 10 is seen in a direction from below and upwards in Fig. 1.
• the infeed gate or channel 14 discharges on the surface of the mould plate 9 and there forms a pouring head 21. It will be apparent from the figure that there is no channel engraved in the first mould plate 9 between the pouring head 21 and the surface 11. Instead, this channel is engraved in the moving mould plate 10 and there carries reference numeral 22 and departs from a depression 23 in register with the pouring head 21 in the fixed mould plate 9. It will be apparent from Fig. 3 that the side of the moving mould plate 10 facing towards the fixed mould plate 9 is mirror-symmetric about a vertical line 24 through the axis of rotation 21. This implies that there is provided a channel 22 and a depression 23 in association with the right-hand surface 13 illustrated in Fig. 3.
• a composite body is to be produced from a zinc alloy and a thermoplastic
• the zinc alloy has a casting temperature of the order of magnitude of 415°C
• the plastic has a maximum permitted temperature below which no damage or degradation of the plastic material takes place.
• this highest acceptable temperature for the plastic lies considerably lower than 415°C.
• the aluminium alloy has a casting temperature of the order of magnitude of 630°C, hence a considerably higher temperature than the casting temperature for the zinc alloy.
• the apparatus includes a temperature sensor which is intended to measure the temperature of the metal part which has just set.
• This temperature sensor is connected to the control system which is common to the injection device 16 and the die casting machine 1 and which, int. al., controls the mould closure and injection time for the plastic.
• the temperature sensor is placed in such a manner that it measures the temperature of the metal part in position II when the tool is open. Via the control system, the temperature sensor initiates mould closure and injection of plastic as soon as the predetermined temperature has been measured. As a result, unnecessary waiting times within a working cycle are avoided.
• both of the tool parts 5, 6 have internal ducts for cooling, possible heating devices for heating certain regions of the tool parts, the requisite ejectors and possible moving jaws all in a conventional manner.
• the moving mould plate 10 displays a movement mechanism which is disposed for realising the reciprocal rotation about the axis of rotation 21.
• the casting of the metal is to take place in terms of time before the injection of the plastic and that, before the injection of the plastic takes place, the temperature of the cast metal will have had time to fall to a given, maximum level.
• the temperature of the metal may, in certain cases, be lower than that disclosed above before the injection of the plastic is put into effect.
• the reverse sequence is also possible, in other words the plastic is injected first whereupon the metal is cast against the already set plastic part.
• the temperature must be monitored in such a manner that the set plastic is at a sufficiently low temperature so as not to be heated to critically elevated temperatures when the casting of the metal takes place.

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=29729253

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (2)

Family Cites Families (7)

• 2003
  • 2003-12-02 SE SE0303248A patent/SE527681C2/sv not_active IP Right Cessation
• 2004
  • 2004-11-26 WO PCT/SE2004/001741 patent/WO2005053930A1/en not_active Application Discontinuation
  • 2004-11-26 EP EP04800400A patent/EP1718451A1/de not_active Withdrawn

Non-Patent Citations (1)

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