Abstract:
The invention relates to a workpiece cutting machine by chip removal e.g. milling machines or lathes. In order to detect an imbalance of rotating element i.e. a cutter head (40) or workpiece which is to be machined (10), sensors (60) are provided for said purpose. Dependent upon imbalance sensor (60) signals, the advancement of the workpiece (10) relative to the tool (40) is corrected in such a way as to compensate for a possible deviation in tool imbalance. In the case of a lathe, the advancement of the workpiece can be controlled according to the position of the rotation angle and the determined imbalance so that balancing can occur during or directly after processing.
Abstract:
In order to remove the sprue (5) from an injection moulding (1) such as a delicate recording-medium disk, e-g- a CD, without producing dust and without the need for complex mechanical operations, the invention proposes that most the hole (20) in the disc is produced by injection moulding and the rest of the hole by removing the sprue from the mounding by a laser (6) once the moulding has been taken out of the mould.
Abstract:
The invention relates to a single or multiple thread screw extruder (1) for the processing of plastics. Said extruder screw has barrier components (30) in a thread and a transition zone (50) to an adjacent thread on each barrier component. Material is partially prevented from flowing in the thread and partially forced into the adjacent thread, thereby firstly resulting in a good mixture and secondly a good level of energy transfer.
Abstract:
In order to lift heavy tracked vehicles without the transmission of torsional forces to the track, a lift frame is proposed in which there are lifting plates (5, 6, 7, 8) on each chain strand (1, 2, 3, 4) which are suspended in the track (9, 10) by means of clips (20, 21, 22, 23). On the front and rear pair of lifting plates (5, 6 and 7, 8) is suspended a cross-member (12, 13) which is carried by cables (11) together with a spreader (14) and a hoist.
Abstract:
A process is disclosed for manufacturing thin-walled mouldings with a ground layer (4) made of thermoplastic materials and a covering layer (5) made of prefabricated flat covering materials pressed together with the ground layer by a back pressing technique in a form tool (8) having a top die (6) and a bottom die (7). The object of the invention is to produce thin-walled mouldings having laminated and non-laminated areas in a simple manner, with no danger of damaging sensitive covering layer materials and with non-laminated areas having a high quality surface. For that purpose, during or after back pressure lamination, i.e. while or after the two dies are closed, besides at least one moulding area (2) laminated with a covering layer by a back pressing technique, at least another area (3) of the moulding is produced by a conventional injection moulding technique, i.e. by injecting molten thermoplastic materials in the part of the moulding cavity (17) in which the area of the moulding which is not laminated with a covering layyer (5) is produced. A moulding in a single piece is thus obtained.
Abstract:
In order to be able to adapt a caterpillar vehicle to various practical applications quickly and economically, it is proposed to make the hull structure modular, consisting of at least two modules (2, 3). At least one module is coupled to the two chassis units (1a and 1b) ant the two chassis units are joined together via tension rods (8). The light weight and small volume of the partially assembled vehicle make it easily transportable by air, e.g. by helicopter.
Abstract:
The invention concerns a mould-clamping device for an injection moulding machine, in which the four tension members (17, 19), which interconnect the fixed mould-clamping plate (3) and the support plate (5) of the clamp drive (7) in a tension-resistant manner, are not designed as straight spars but are L-shaped. Each tension member (17, 19) is connected at an upper connection point (21, 25) to one plate (5, 3) and at a lower connection point (23, 27) to another plate (3, 5). The upper edge (33) of the tension members (18, 19) is lower than the clamping pressure axis (11), such that free access to the space between the mould clamping plates is ensured. The tension members (17, 19) are exactly the same shape and size such that, under the influence of the clamping pressure, they are extended by the same amount and so the fixed mould-clamping plate (3) and the support plate (5) remain parallel.
Abstract:
Long reinforcement fibres are incorporated into a plastic part made of a chemically reactive plastic mixture or molten thermoplastic materials. For the long reinforcement fibres to be gently and homogeneously distributed in a single operation in the fluid plastic materials without being destroyed, before the fluid plastic materials are pressed in a plastics moulding tool, a flow of fluid plastics is generated and joined to a flow of long reinforcement fibres outside a mixing chamber where the reactive plastic mixture is prepared or outside a melting unit where thermoplastic materials are molten.
Abstract:
The invention concerns a rounding device (10) comprising two shaping dies (12, 14) with shaping chambers (22, 24) in order to round a sheet bar (26) about a core (16). The peripheral lengths of the two shaping chambers (22, 24) are each longer than half the can length. During a shaping step, the core (16) penetrates a first shaping chamber (22) by a depth which is greater than the can radius. The sheet bar (26) is thus shaped in the form of a U. In an intermediate shaping stage, an auxiliary core (18) is placed on the core (16) such that, as the second shaping die (14) moves downwards, only the ends of the U-legs of the sheet bar blank (26) are shaped arcuately. When the auxiliary core (18) and part (20) of the first shaping die (12) have been removed, the final can shaping process occurs, in which the second shaping die (14) likewise travels over the centre of the can. The three-stage rounding method enables cans to be rounded highly accurately and carefully.