DE724975C - Process for the production of pressed powder bodies - Google Patents
Process for the production of pressed powder bodiesInfo
- Publication number
- DE724975C DE724975C DEW107631D DEW0107631D DE724975C DE 724975 C DE724975 C DE 724975C DE W107631 D DEW107631 D DE W107631D DE W0107631 D DEW0107631 D DE W0107631D DE 724975 C DE724975 C DE 724975C
- Authority
- DE
- Germany
- Prior art keywords
- powder
- pressed
- production
- powder bodies
- pressed powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B21/00—Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
- C06B21/0033—Shaping the mixture
- C06B21/0041—Shaping the mixture by compression
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Description
Verfahren zur Herstellung gepreßter Pulverkörper Die Formgebung von rauchschwachem Röhrenpulver ,geschieht meist in der Weise, daß die zu einer Decke ausgewalzte Pulverrohmasse aufgerollt, in einen Preßzylinder gebracht und durch eine Matrize geeigneter Bauart hindurchgepreßt wird. Bei der Herstellung besonders von starkwandigen Pulverkörpern treten jedoch Schwierigkeiten auf, denn die in der Pulverrohmasse vorhandenen luftgefüllten Hohlräume geben zu Fehlstellen, Lunkern u. dgl. in den ausgepreßten Pulverkörpern Anlaß. Für -ein gleichmäßiges Abbrennen und damit für die Brauchbarkeit dieser Pulverkörper überhaupt ist aber eine völlige Gleichmäßigkeit der Wandstärke unbedingte Voraussetzung.Process for the production of pressed powder bodies The shaping of low-smoke tube powder, is usually done in such a way that it forms a ceiling rolled raw powder mass, brought into a press cylinder and through a die of suitable design is pressed through. Especially when it comes to manufacturing of thick-walled powder bodies, however, difficulties arise because those in the The air-filled cavities that are present in the raw powder mass lead to imperfections and voids and the like in the pressed powder particles cause. For -an even burning and thus for the usefulness of these powder bodies in general, however, is a complete one Uniformity of the wall thickness is an absolute prerequisite.
Um solche Fehlstellen zu vermeiden, ging man bisher so vor, daß aus einer Pulverdecke zunächst runde Scheiben ausgestochen wurden. Diese wurden sorgfältig aufeinander-,gelegt, der so gebildete Zylinder in den Preßzylin.der eigesetzt und verpreßt. Es hat sich aber in .der Praxis ergeben, daß ,auch dann noch keine völlig lunkerfreien Pulverkörper erhalten wurden.In order to avoid such flaws, one went so far that from First round slices were cut out of a powder blanket. These have been carefully one on top of the other, placed, the cylinder thus formed in the Preßzylin.der eigesetzt and pressed. In practice, however, it has been found that, even then, not completely void-free powder bodies were obtained.
Um die Entstehungsmöglichkeit von Lunkern restlos auszuschließen, sah man sich schließlich gezwungen, außerdem noch Preßzylinder vor der Pressung zu eval,-uieren. Diese Arbeitsweise ist aber sehr zeitraubend und führte zu einer starken Leistungsminderung der vorhandenen Preßanlagen.In order to completely rule out the possibility of voids forming, In the end, one saw oneself compelled, and also press cylinders before pressing to eval, -uieren. This way of working is very time consuming and led to a severe reduction in the performance of the existing press systems.
Versuche haben ergeben, daß man auf wesentlich einfachere Weise völlig fehlerfreie Pulverkörper herstellen kann. Dies geschieht erfindungsgemäß durch Zerlegung des Preßvorganges in zwei Stufen. In der ersten Stufe wird die z. B. zu einer Rolle aufgewickelte Pulverdecke in einem mit einem Auslaß versehenen Preßzylinder unter starkem Druck vorgepreßt. Hierbei wird aus dem Auslaß, für den man zweckmäßig eine beliebige kleinkalibrige Pulvermatrize ver«-cndet, ein sehr ,geringer Anteil der Pulvermassc ausgepreßt. Gleichzeitig entweicht aber überraschenderweise die gesamte esclilossene Luft. In der zweiten Stufe deFe@efahrens wird der so gebildete luftfreie -PüTverkörper zu Pulversträngen der gewünschten Form ausgepreßt.Experiments have shown that you can do this in a much simpler way can produce flawless powder bodies. According to the invention, this is done by decomposition the pressing process in two stages. In the first stage the z. B. to a role wound up Powder blanket in one with an outlet Press cylinder pre-pressed under strong pressure. Here is from the outlet for the it is advisable to use any small-caliber powder matrix, a very good one , low proportion of the powder mass pressed out. At the same time, however, surprisingly escapes all of the escaped air. In the second stage deFe @ efahren is trained in this way Air-free powder bodies pressed into powder strands of the desired shape.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEW107631D DE724975C (en) | 1940-08-20 | 1940-08-20 | Process for the production of pressed powder bodies |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEW107631D DE724975C (en) | 1940-08-20 | 1940-08-20 | Process for the production of pressed powder bodies |
Publications (1)
Publication Number | Publication Date |
---|---|
DE724975C true DE724975C (en) | 1942-09-10 |
Family
ID=7616798
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEW107631D Expired DE724975C (en) | 1940-08-20 | 1940-08-20 | Process for the production of pressed powder bodies |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE724975C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE976589C (en) * | 1944-06-30 | 1963-12-05 | Wolfgang Schmid | Steplessly working electrical sensor control |
-
1940
- 1940-08-20 DE DEW107631D patent/DE724975C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE976589C (en) * | 1944-06-30 | 1963-12-05 | Wolfgang Schmid | Steplessly working electrical sensor control |
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