Engel Maschinenbau Gesellschaft M.b.h.

Engel Maschinenbau G.m.b.h.

Engel Maschinenbau Gesellschaft Gmbh

Heinz Leonhartsberger

Otto Urbanek

Werner Kappelmuller

Helmut Naderhirn

Stefan Eppich

Franz Dirneder

Gerhard Wimbauer

Alfred Lampl

Franz Peirlberger

Friedrich Kuhberger

Apparatus for injection molding plastic material

An injection moulding machine having a machine frame (1), a stationary and a movable mould mounting plate (2,8) for fixing mould portions (4,9) and an injection unit (5) which opens into the mould through the stationary mould mounting plate (2), wherein the force applied by the closing mechanism is transmitted through the machine frame instead of through bar members and the injection unit (5) is in rigid connection with the stationary mould mounting plate (2).

Injection moulding machine having an injection unit tiltable with a

In order to operate the closing means of a double plate injection moulding machine including a fixed and a movable mould plate, the closing means comprising at least one pump (22), at least one high speed cylinder for a high speed stroke and at least one closing cylinder (10) for a closing stroke with a nominal closing force, whereby the closing cylinder (10) includes a double action piston (7) in which both piston faces (13, 14) are the same size and which divides the interior of the closing cylinder (6) into two cylinder sections (8, 9) which are hydraulically connectable via hydraulic lines (21, 22) and a valve (26), the following method is carried out: during the high speed closing operation using the high speed cylinder (3), both sides of the piston (7) of the closing cylinder (10) are pressurized with an equal, high pressure which is as high as or higher than that required to obtain the required nominal closing force, whereby on moving the piston (7) of the closing cylinder (10) in the closing direction (15), the valve (26) allows the pressure between the two cylinder sections (8, 9) to be equalized, and in that the power closing operation is effected by releasing hydraulic oil from the cylinder section (9) of the closing cylinder (10) in which the hydraulic pressure causes a force which acts on the movable mould plate in the direction opposite to the closing direction (15), the valve preventing the pressure between the two cylinder sections (8, 9) from being equalized.

Method of operating the closing means of a double plate injection

A rubber injection molding machine includes a mold rack, an injection position with lower and upper platens and an operator station. Rolling beams are mounted at opposite sides of the injection position and can be lifted and lowered. Between such beams is a mold carrier which can be moved in the rolling direction of the beams. The mold carrier grasps a clamping pin of a bottom half of the mold.

Mold changing device in injection molding machine

Injection moulding machine

Arrangement for carrying out a two-stage linear movement

An injection molding machine includes a machine frame, stationary and movable mold fixing plates and a cylinder plate carrying at lest one piston-cylinder unit. The cylinder plate and the stationary mold fixing plate are not connected as usual by beam members, but are connected exclusively by way of the machine frame. A piston of the piston-cylinder unit is rigidly connected to the movable mold fixing plate and is pivotable relative to a cylinder of the piston-cylinder unit.

Injection molding machine including laterally displaceable piston

In an injection molding machine having a machine frame, a stationary mold mounting plate, a movable mold mounting plate and a support portion on the machine frame, which carries a mold closing mechanism, the support portion and the stationary mold mounting plate are connected exclusively by way of the machine frame. The closing force which occurs during the closing phase and the expansion force which occurs during injection, as between the support portion and the stationary mold mounting plate, are carried only by way of the machine frame. The mold mounting plates are mounted tiltably about a respective horizontal axis while a guide means is provided between the two mold mounting plates or the movable mold mounting plate and the machine frame.

Injection molding machine having tiltable mounting plates

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Schwertberg, Austria

Heinz Leonhartsberger