摘要:
An apparatus used for measuring a holding force expected to be applied to a pressure member (30) of a press (10, 150), before the lower and upper dies (12, 18) and the pressure member are installed on the press. The apparatus includes a measuring member (106, 262, 322, 344) to be placed on cushion pins (24) of the press associated with a fluid-actuated cylinder (42) via a cushion pad (28). A sensing element (112, 264, 326, 348) is disposed on the measuring member or a main slide (20) carrying the upper die, such that the holding force produced by force applying means (51) which includes the cylinder acts on the sensing element, when the measuring member is lowered with the sensing element by the main slide in its downward movement towards a bolster (14, 154) on which the lower due is fixed. A load detecting device (116, 266, 332, 360, 364) is disposed on the sensing element for detecting the holding force acting on the latter. The apparatus also includes a device (120, 122) for recording the holding force as detected by the load detecting device.
摘要:
An apparatus used for measuring a holding force expected to be applied to a pressure member (30) of a press (10, 150), before the lower and upper dies (12, 18) and the pressure member are installed on the press. The apparatus includes a measuring member (106, 262, 322, 344) to be placed on cushion pins (24) of the press associated with a fluid-actuated cylinder (42) via a cushion pad (28). A sensing element (112, 264, 326, 348) is disposed on the measuring member or a main slide (20) carrying the upper die, such that the holding force produced by force applying means (51) which includes the cylinder acts on the sensing element, when the measuring member is lowered with the sensing element by the main slide in its downward movement towards a bolster (14, 154) on which the lower due is fixed. A load detecting device (116, 266, 332, 360, 364) is disposed on the sensing element for detecting the holding force acting on the latter. The apparatus also includes a device (120, 122) for recording the holding force as detected by the load detecting device.
摘要:
An object of the present invention is to provide a die cushion device of a press machine, wherein preliminary acceleration can be applied to a die cushion pad following the descent of a slide at an accurate timing and with high accuracy, and such improvements can be achieved that a difference in pressure between a real pressure in a hydraulic cylinder and a preset target value can be eliminated in the vicinity of a bottom dead center of a slide stroke. Said die cushion device comprises an air pressure cylinder (6) and a hydraulic cylinder (7) having a servo valve (40) for controlling a discharge pressure and fed with pressure oil through suction, wherein the supply of the pressure oil to the hydraulic cylinder (7) at the time of said preliminary acceleration is performed through a pressure oil supply circuit (16) provided with a servo valve (22) being controlled by a main body (14) of a control device, and a control signal from a main body (27) of a pressure control device for controlling the servo valve (40) for controlling the discharge pressure in the hydraulic cylinder (7) is corrected in accordance with a speed of slide descent and a speed of press operation.
摘要:
A hydraulic cushioning apparatus for a press, having work-supporting pressure pins (7), hydraulic cylinders (8) linked with the pressure pins, and a fluid passage (15, 17, 30) connecting a hydraulic power supply (20) to the hydraulic cylinders, to apply a preset hydraulic pressure to the cylinders. The apparatus includes a shut-off valve (25) disposed in the fluid passage for connection and disconnection of the hydraulic power supply to and from the hydraulic cylinders, and a controller (26) for controlling the shut-off valve such that the shut-off valve is closed before a movable die (1) of the press comes into pressing contact with the workpiece (W), and is held in the closed position for at least a period which expires when the fluid in the hydraulic cylinders rises to the preset pressure level.
摘要:
Zur Erhöhung der regelbaren Durchflußmenge durch ein Proportionalventil (13) unter Vermeidung eines größeren Ventils oder von zwei parallel zu schaltenden Ventilen gleicher Art wird ein Steuerventil (Proportionalventil 13) mit zumindest zwei parallel geschalteten Durchflußwegen (24, 25) verwendet, wobei einem ersten der Durchflußwege (25) zumindest ein schaltbares Ventil (16, 17) in Reihe geschaltet ist zum Sperren oder Freigeben der Förderleitung (15, 12) und der geschaltete erste Durchflußweg (25) und das schaltbare Ventil (16, 17) parallel zu dem zweiten Durchflußweg (24) geschaltet sind.
摘要:
In der Zieheinrichtung (3) einer Presse sind einzelne Druckbolzen (5, 6) aus einer Mehrzahl an Druckbolzen (5, 6) diskret anzusteuern, um so auf die Ziehverhältnisse bei Ziehen von Blechteilen, auch mehrerer gleichzeitig zu formender Blechteile, einwirken zu können. Hierbei sind die Ziehzylinder (9, 10) in horizontalen Schienen (13) geführt und vermittels Stell- und Bewegungsübertragungsmittel (14, 16, 17, 18, 19) in zumindest einer Bewegungsrichtung (Achse) unterhalb der Druckbolzen (5, 6) einzeln, bei gemeinsamer Verstellanordnung in Gruppen, verfahrbar.
摘要:
Es wird eine mechanische oder hydraulische Presse mit Zieheinrichtung vorgeschlagen, bei welcher ein Pressenstößel (8) über mehrere Zugstangen (12) mit einem unterhalb einer Druckwange (10) angeordneten Blechhalterrahmen (13) kraftschlüssig verbunden sind. Auf dem Blechhalterrahmen (13) sind zur Abstützung der vier Eckpunkte der Druckwange (10) vier Kolben-Zylindereinheiten (14 bis 16) vorgesehen, die während des Ziehvorgangs ein hydraulisches Verspannen des Blechhalters (6) vornehmen.