DE2932397A1 - METHOD FOR PRODUCING SINGLE-LAYER COMPRESSES - Google Patents

Abstract

1. A process for the production of single-layer pressed articles from powdered substances by means of automatic pressing machines, in which, in corresponding operating positions within a pressing cycle, the powder is filled into a pressing tool, pressed and ejected, where a discontinuously-operating multi-position automatic pressing machine (MPA) having a circular table is used, and the pressing and ejecting of the pressed articles are respectively carried out during stand-still of the circular table, characterised in that, for each pressing cycle, a single filling operation is carried out over an extended angular region of the circular table ; and that the pressing cycle (F1A...A1/F2A...A2) is repeated at least once during a rotation of the circular table.

Description

SIEMENS AKTIENGESELLSCHAFT Our reference Berlin and Munich VPA 79 P 7 5 3 8 BRD

Process for the manufacture of molded bodies

The invention relates to a method for producing Elnschicht-Preßkurpern from powdered substances by pressing machines _y in which the powder is filled, pressed and ejected into a press tool in appropriate working positions within a press cycle.

It is known to use single-layer compacts on pneumatic, hydraulic or mechanical automatic presses by filling a mold, pressing and ejecting. The press cycle is made up of the sum of the Times for the individual steps: filling the mold, pressing and ejecting together. 20th

The invention is based on the object of developing a method with which the quality of the molded parts, in particular with regard to weight tolerance and the length of the

Vb 2 Dm / 2.8.1979

130009/0340

--a- VPA 79 P 7 5 3 8 BRD

Cycle time can be significantly improved.

This object is achieved according to the invention in that a multi-position automatic press is used and that the press cycle is repeated at least once over one cycle.

A multi-position automatic press is already known from DE-PS 24 20 726.

It can be advantageous for the pressing and ejecting positions to be combined into one working position will. Furthermore, the press cycle can be completed over one cycle according to the number of press units used. witness to be repeated.

The invention is explained in more detail using the drawing and an exemplary embodiment. Show it:

Fig. 1 is a schematic representation of the sequence of the method according to the invention in six division, 2 shows a schematic representation of the sequence of the method according to the invention divided into four.

Fig. 1 shows a schematic representation of the sequence of the method according to the invention in six division on one Automatic sweeping position press. The automat has two cycles. The first cycle consists of the filling process, which extends from F1A through F1 to F1E, the pressing process P1 and the ejection process A1. The second press cycle consists of the filling process from F2A to F2 to F2E, the pressing process P2 and the ejecting process A2. The filling process starts with F1A resp. F2A, with the press table moving clockwise moved according to direction arrow 1. The sub-

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stamp of a filling die (not shown) (pressing tool) is moved downwards via a cam disk, also not shown, so that powder is already in the Filling space of the die can flow. When the die has reached position F1, the press table stops and the filling process slows down here in order to achieve the tightest possible mass tolerance. Afterward the press table starts moving again. Excess powder is now removed from the die by means of a stripped stripped. The operation is at F1E completed. When the die has reached position P1, the press table stops and the pressing process starts. The press table then moves in direction A1. In this position the press table stops and the finished compact is ejected. As you continue to turn of the press table, the press cycle described is repeated once more. One total revolution of the The press table corresponds to two press cycles with six standing positions.

Fig. 2 shows a schematic representation of the sequence of Procedure on a multi-position automatic press Division of four. The machine again has two work cycles. The first cycle consists of the filling process, which extends from F1A through F1 to F1E, the pressing process P1 and the ejecting process A1. The second press cycle consists of the filling process, which differs from F2A extends over F2 to F2E, the pressing process P2 and the ejecting process A2. The filling process begins in each case F1A or F2A, the press table moving clockwise according to the direction arrow 1. The lower punch of a filling die (press tool), not shown, is moved downwards via a cam disk, also not shown, so that already

Powder can flow into the filling space of the die. Is the

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VPA 79 P 7 5 3 8 FRG

When the die arrives at position F1, the press table stops and the filling process slowly ends here, to achieve the tightest possible mass tolerance. Then the press table starts moving again. Excess powder is wiped off on the die using a scraper. The stripping process is at Position F1E ended. When the die has reached position P1A1, the press table stops and the pressing process stops P1 and then the ejection process A1 run.

The press table then starts moving again and the second press cycle begins. At F2A the filling process begins. The press table stops in position F2 and the filling continues. The press table continues to run, wiping off excess powder from the die. The stripping process is at F2E finished. In position P2A2 the press table stops for the fourth time. In this position the powder is pressed and the finished compact is ejected.

If the diameter of the press table is large enough and thus sufficient filling paths, the press cycle can also be carried out three or more times over one revolution of the press table.

3 claims
2 figures

130009 / 03A0

Claims (3)

-4- · VPA 79 P 7 5 3 8 BRD Claims M./Process for the production of one-piece compacts from powdery substances using automatic presses which the powder is filled into a press tool in the corresponding working positions within a press cycle, pressed and expelled, thereby characterized in that a multi-position automatic press is used and that the press cycle is repeated at least once over one revolution. 2. The method according to claim 1, characterized that the pressing and the ejection positions are combined into one working position will. 3. The method according to any one of the preceding claims, characterized in that that the press cycle over one revolution accordingly the number of pressing tools used is repeated. 130009/0340