DE692802C - Mechanically driven press for the production of ceramic dry pressed bodies and pressed bodies from granular and powdery pressed material - Google Patents

Description

GERMAN EMPIRE

ISSUED ON
JUNE 27, 1940

REICH PATENT OFFICE

PATENT LETTERING

M 692802 CLASS 80 a GROUP

St 56625 VIJ8oa

have been named as inventors.

Steatit-Magnesia Akt.-Ges. in Berlin-Pankow

Patented in the German Empire on September 22, 1937 Patent issued May 30, 1940

The invention relates to mechanically driven presses for the production, ceramic dry compacts and other compacts made of granular and powdery compacts, in which during the pressing process the upper punch and the die independently of one another by mechanical means Means are moved downwards and the pressing tools, that is upper punch and die, with hydraulic and / or pneumatic actuated piston are connected. They are in themselves presses for the production of ceramic compacts known, in which in addition to mechanical forces also hydraulic Forces are at work. In these known presses, however, the mechanical ones work and the hydraulic forces in the same direction, with the result that the stroke of the pressing tools is not exactly fixed is, because this falls depending on the predominance of the mechanical or the hydraulic Different forces.

These inadmissible differences in the manufacture of ceramic dry compacts the press tool strokes are eliminated in the press according to the invention in that at the downward movement of the pressing tools during the pressing process, the piston forces counteract the forces exerted by the mechanical means and by ensuring ' a constant frictional connection between the pressing tools and the mechanical means the pause by the Ensure shaping of the mechanical means prescribed strokes of the pressing tools.

Claims (4)

Attempts have also been made to solve this problem by using the pressing tools under the action of weights or spring forces with constant frictional connection held with their mechanical drive means. The arrangement of weights or springs, however, require considerable additional space, and are also one Row of additional moving parts, reversing levers, pulleys and the like, in this type the production of a constant frictional connection between pressing tools and drive or drive. Control organs necessary. The press according to the invention is also advantageously designed in such a way that the return movement the pressing tools in the filling position by the hydraulic and / or pneumatic actuated piston takes place, the mechanical drive means only controlling the movement. Preferred come as mechanical means for moving the pressing tools known cams for the application, of which the cam disks assigned to the die have the Move the die also into the ejection position and move them all together, but independently of each other, control the return movement of the preJ3 tools in the filling position. A crowded one Structure of the press according to the invention can be achieved in that one in the Press frame provided cavity as hydraulic and / or pneumatic energy storage serves. The drawing shows an embodiment of the subject matter of the invention. The cylinder a, which is firmly screwed to the stand b of the press, is connected to the pressure vessel d by a pipe c . The air brought to a certain overpressure in the pressure vessel d presses the liquid (water, oil, etc.) located in the lower part of the pressure vessel d , which in turn pushes the piston e upwards. The ram f is firmly connected to the piston e. The ram / is therefore always hydraulically held in its extreme retracted position or moved back into this. When the press is switched on, the cam disk h wedged tightly on the shaft g pushes the ram / downwards and thus the liquid in the cylinder α back into the pressure vessel d. The upward movement of the ram / then takes place again through 'the pressurized liquid, which pushes the piston e and thus also the ram / upwards as soon as the cam h releases the upward movement as the shaft g continues to rotate. The die i is connected by a spindle k to a traverse / guided in the lower part of the stand b , which in turn is firmly screwed to a piston m. The associated cylinder η is also connected to the pressure vessel d by a pipe ο . The hydraulic fluid pushes the piston m and thereby the crossbeam / with the die i always upwards into the so-called filling position of the die. In the traverse / rods ρ are attached on both sides to be variable in the longitudinal direction, which are equipped with rollers q at their upper end. On both sides of the cam disks h, adjustable cam disks r are keyed on the shaft g , which, when pressed, press on the rollers q and over the rods on the traverse /. The pressing process proceeds as follows: The cam h pushes the ram / down until the upper part s has entered the die i . At this moment press the cams r over the rod p the cross member / with the die i and the piston m down into the pressing position. The liquid in the cylinder α and the cylinder η is inevitably pushed back into the pressure vessel if. The accuracy of the pressing position is ensured by the fact that the pressure in the cylinder η only permits the downward movement of the die i as prescribed by the upper cam r. After the body has been pressed out, the upper punch s moves upwards again under the action of the piston e , while the cam disks r press the die % further down through the rod p into the withdrawal position. The upward movement of the die % into the filling position is then done hydraulically again, in that the pressure fluid pushes the piston m and thus the die i upwards at the speed which is prescribed by the shape of the cams r. The invention is not limited to the illustrated embodiment. she finds also with presses in which the pressing tools are operated by other means than cam disks be moved or controlled, advantageous application. Patent kitchen: "5 i. Mechanically driven press for the production of ceramic dry compacts and of pressed bodies made of granular and powdery pressed material, in which the upper punch during the pressing process and the die is independent of each other by mechanical means are moved downwards and the pressing tools (Upper punch, die) are connected to hydraulically and / or pneumatically operated pistons, characterized in that that with this downward movement during the pressing process, the piston forces are affected by the mechanical means counteract the forces exerted and by ensuring a constant frictional connection between the pressing tools and the mechanical means maintain the conditions prescribed by the shape of the mechanical means Ensure strokes of the pressing tools. 2. Mechanically driven press according to claim i, characterized in that that the return movement of the pressing tools into the filling position by the hydraulic and / or pneumatically operated piston takes place, the mechanical drive means just control the movement. 3. Mechanically driven press according to claim 1 and 2, characterized in that that the mechanical means for moving the pressing tools are known cams, of which the cam disks assigned to the die also move the die into the ejection position move and all together, but independently of each other, the return movement of the pressing tools in the filling position steer. 4. Mechanically driven press according to claim 1 to 3, characterized in that that a cavity provided in the press frame as a hydraulic - "tmd / or pneumatic energy storage is used. 1 sheet of drawings