DE2335686A1 - WIPER RING - Google Patents

Description

PRIED. KRUPP GSSEIiISCHAS ¹ T WITH RESTRICTED SHARK ¹ TUNG

in food

Wiper ring

The invention relates to a stripping ring which is used, for example, in ironing presses for stripping deep-drawn and ironed can bodies from the drawing tool or for stripping off cut waste or trimmed strips is used ,,

Such a ring usually consists of several similar segments of a circle held together by suitable means and directed towards their common central axis are resiliently compressed »In an ironing press, the wiper ring is during of the working stroke of the mandrel and the can body located on it, the segments springy avenge to evade the outside. On the other hand, the segments that are now directly adjacent to the mandrel stop during the return stroke the scraper ring back the edge of the can body and prevent its further movement. Of the The mandrel moving further back is therefore pulled out of the can body, thereby wiping it off the mandrel and then generally falls out of the work area of the press due to the effect of gravity "

EV 118/72
KH / He

409885/0230

Such wiper rings belong to the prior art. US Pat. No. 2,261,060 shows a ring with three segments that are inserted into an annular groove on the circumference of the segments elastic ring made of suitable material (e.g. rubber). In the GB.-PS 825 721 a combined wiper and crimped ring is shown, the segments of which are marked by a annular tension spring are held together. According to OH-PS 261 164 are to be compressed of the segments arranged radially, supported on a fit surrounding them Helical compression springs applied »According to DT-AS 1 285 973, the segments are finally through two elastic rings held, whereby they can rotate around the one ring and from that to be squeezed together "

In all the embodiments mentioned, the scraper ring consists of a large number of individual ones loose segments that are simply held together by additional resilient elements. There the segments made of hardened material have to test, the necessity arises, the elements to separate before hardening and then to grind them as individual parts. However, it requires a considerable effort, in this way an exactly circular through opening of the scraper ring to reach.

A0 9885/0230

The invention has for its object to be a

To create a scraper ring in a simple manner with an exactly circular passage opening can be produced. In addition, it should be as short as possible, since ironing presses Due to the forming process, a long stroke is already required anyway.

The above object is inventively achieved in that the individual segments cohesive resilient means is a casting and in that the segments with a they od _or the like., And the casting compound surrounding annular disc form one structural unit ,.

Because the scraper ring is constantly in contact with cans comes, which are coated with a lubricant, the casting compound expediently consists of a Materials that are resistant to oil and other chemical substances around the cans wrinkle after stripping a perfect drop To enable the segments receiving the annular disc must not over their wiping edges protrude.

The advantages that can be achieved with the invention are, in particular, the possibility of rapid and perfect finishing of the scraper ring. The additional one caused by the wiper ring The stroke is also kept to a minimum.

_ ¹ Z _

409885/0230

An embodiment of the invention is in there? Drawing shown schematically and explained in more detail below.

Show it

Fig. 1 with the tool of a stretching press built-in wiper ring in longitudinal section and in oblique view,

2 shows a segment of the scraper ring and the annular disc surrounding it, both in longitudinal section,

3 to 5 the interaction of the drawing mandrel and a can body with the stripping ring in different phases of the working stroke, and zvec in Fig. 3 before the passage, Fig. 4 during the passage and Fig. 5 after the passage of the drawing mandrel and the can body through the Wiper ring.

The scraper ring 1 consists of a plurality of similar segments 2, which by an elastic Casting compound 3 are held together and with this and the annular disk 4 surrounding it a structural Form unity. The washer 4 is with screws on the housing 6, which is only through an ironing ring takes up the indicated tool set, attached, so that the can body after stripping properly after The screws 5 are countersunk

409885/0230

heads provided. In addition, the end face 8 of the disk 4 can be a small amount a relative to the flange. 9 be reset _o

The segments 2 rest with their recess edges 10 (Pig. 2) on the edge 11 of the annular disk 4 and can pivot about the contact edge formed jointly by the two. When the needle 12 moves with a can body 13 through the scraper ring (Fig. 3) and the bottom edge 14 of the can body comes into contact with the conically shaped inner surfaces 15 of the segments 2, these are pressed so far apart against the deformation resistance of the elastic mass 3 that the can body 13 can slide past them (Fig _o 4) «.

When the can body 13 has passed its entire length through the scraper ring (FIG. 5), the casting compound 3 expands again to such an extent that the contact edges 16 of the segments 2 rest on the mandrel 12 itself. In the return stroke of the rim comes 17 of the first with retracting the can body 13 for abutment with the end faces 18 of the segments 2 _O These prevent further movement of the can body 13 'is therefore stripped off during the further return stroke of the dome 12 of the latter _o In order a vacuum that tends to form between the mandrel and the bottom of the can,

409885/0230

To avoid it, it is advisable to start the stripping process with the bottom of the can from the inside to apply a moderate overpressure »For this purpose, the mandrel 12 can have a longitudinal bore be connected to a pressure source.

When the mandrel 12 has withdrawn again through the scraper ring 1 (FIG. 3), the elastic mass 5 expands again to its original size. The resulting passage opening now has a diameter d again. _; which is smaller than the diameter d _{D of} the dome 12 _e This position is defined by the contact between the stop surfaces 19 on the segments 2 and 20 on the annular disk

Cold-vulcanizing has proven to be an elastic casting compound Proven silicone rubber. The pre-machined segments 2 are with their surfaces brought into contact with the surface 20 of the annular disk 4, the casting compound is with a suitable hardener mixed and released into the free space between the annular disk 4 and the segments 2 held by a device. Nice after some time this mixture takes on rubber-elastic properties at room temperature. Of the The wiper ring, which now forms a structural unit, can be completely ground on a further device will.

6 -

409885/0230

Claims (1)

Expectations Stripping ring for stripping deep-drawn and ironed can bodies or "trimmed" Waste strips from the drawing mandrel of an ironing press moving back in the return stroke, consisting of a large number of similar segments, which are directed by elastic means in the direction are pressed on their common central axis, characterized in that the elastic Means is a casting compound (3) and the segments (2) after casting and curing with an annular disk (4) or the like surrounding it and the casting compound form a structural unit ", Wiper ring according to claim 1, characterized in that that the elastic casting compound consists of a mixture of silicone rubber and a hardener. 409885/0230