DE29814613U1 - Gate features in a die-casting mold for door or window handles or the like, in particular in the case of aluminum alloys - Google Patents

Description

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FEMUK Business Consulting GmbH D-82467 Garmisch-Partenkirchen

Cutting characteristics of a die-casting mould for door or window handles
or the like, especially with aluminium alloys.

On July 10, 1996, the applicant filed a German utility model application AKZ: 2 96 11 98 5.7 and a patent application AKZ: 196 27 698.

Both applications are completely identical in the description, drawings and claims.

The applications are based on the inventive idea of not providing a point gate, a tunnel gate or a film gate in a die-casting mold for die-cast parts to be anodized.

These sprues require a relatively high injection pressure, which the die-casting machine creates via a piston.
The metal solidification of the die-cast part cannot occur in such a way that primary or mixed crystals can form.
Due to the high pressure, the primary or mixed crystals are deformed during solidification.
They are deformed next to each other or are often

layered on top of each other.

The applications according to the indicated file numbers are based on a deformation of the primary or mixed crystals.

Solidification and normal crystallization - from a metallurgical point of view - should take place through primary channels (33,33') Fig. 7-9 of the applications dated 10.07.1996 and prechambers (35,35') .

10It is doubted that a metal accumulation in the prechambers (35,35') is equivalent to a funnel or riser function and causes a saturation of the die-cast parts (29 - 29'') Fig. 7.
Saturation cannot occur because the pressure from the piston is still present.

Even ternary channels (33,33'), (34,34'), 36) Fig.7,8 do not change the circumstances.

The different arrangements also do not provide any improvements. Provided ribs or similar do not provide any relief either.

Tests carried out have shown that the inventive idea of the applications and designs according to the above-mentioned file numbers do not produce the expected results. The anodized surface has turned out to be unusable.

Nevertheless, the task of creating sprues or gate features that guarantee a decoratively acceptable anodized surface still remains with die-casting molds, especially for door and window handles made of aluminum alloys.

The problem is solved by the characterizing part of the claim.

The invention is not limited to the main claim and the dependent claims.

Descriptions and graphic representations in dependent and independent combinations may be relevant to the invention.

The invention is illustrated in the drawing.

However, only one nest is shown in the respective drawings.

For example, in a quadruple form, the remaining three nests must be arranged accordingly.

First of all, they show:

Fig. 1 is a partial drawing of a nest in a die casting mould,

Fig. 2 a partial drawing of a nest at a

Die-casting mold with a differently arranged riser and a differently designed sprue,

Fig. 3 another partial drawing of a nest at

a die casting mould with a relocated sprue and adapted riser, whereby the various possibilities for the risers to be arranged are indicated in dash-dotted lines.

It is certainly sufficient to depict only one nest of the die-casting mold and also to describe only the design of one nest

In a 4-way form, the remaining 3 nests are arranged alternatively.

Fig. 1 shows a die-cast part (1) Fig.1,2,3, which is connected to the riser (2) Fig.1 via a direct gate (2) Fig.1,2,3.

The riser (3) Fig.1 ends at the lower section of the

_ 4 cuts
2 and is enlarged towards the top.

The sprue (4) Fig.1 is machined in the angle range a plus b in such a way that it is connected from the piston chamber (5) Fig.1 at a freely selected angle to the lower third of the riser (3) Fig.1 by the shortest possible path.

The cross-section of the sprue (QS) corresponds approximately to half of the riser (TS) Fig.1 and 3.

In Fig. 1, the possible sprue channels (4,4',4'') in the angle range a plus b Fig.1 from the piston chamber to the respective riser are indicated by dash-dotted lines.

Fig.2 shows a modified riser (3') which ends at the 15: lowest part of the gate (2'). ' At the same time, the sprue (4') Fig.2 is arranged in the angle range a plus b Fig.1 in such a way that it is connected to the riser (3') Fig.2 in the uppermost area.

Fig.3 shows another possible arrangement of the riser (3''). The riser (3'') is extended downwards, whereby the riser has the width (TS) in the downward extension. The sprue (4'') is connected to the riser (3'') at the lowest end.

The liquid or pasty metal rises in the riser (3 ^r/ ) due to the pressure of the piston, fills the die-cast part (1) Fig.3 as it rises and continues to rise until it reaches the height (H) Fig.3. The riser (3'') Fig.3 then acts on the die-cast part (1) Fig. 3 like a normal riser and causes a normal function of a riser. Primary crystals and mixed crystals can form.

If the results are satisfactory, it is possible to increase the cross-section of the sprue so that the metal can flow even faster and the pressure is thus reduced.

- 6 Reference symbols overview

1 die-cast part

2 direct cut 2' direct cut 2'' direct cut

3 riser arrangement 3' riser arrangement 3'' riser arrangement

4 runners 4' runners 4'' runners

5 Piston chamber

QS Cross section of the respective sprue

TS lower cross section of the riser

H top height of riser 3''

Claims (4)

- 8 Protection claims · Gate features in a die-casting mould for door or window handles etc., in particular in the case of aluminium alloys, whereby liquid metal passes through a piston chamber under pressure from a press piston via one or more sprue channels and primary or secondary channels to the die-cast part or parts.
characterized, that the die-cast part (1) is connected via a gate section (2,2',2'') to a riser formed by a single recess or cavity (3,3',3''), liquid or doughy aluminum alloy that is about to solidify fills the die-cast part (1) via a short sprue (4,4'4'') from the piston chamber (5) by means of piston pressure via the riser (3,3',3'') and solidifies there directly or indirectly under the influence of the riser (3,3',3"). 2. Gate features in a die casting mould according to claim 1 , characterized in that that the gate channel (4,4'4 ^7/ ) is arranged in the angle section a plus b. 3. Gate features in a die casting mold according to claims 1 and 2, characterized, that the sprue (4,4',4'') has a uniform cross-section (QS), but can widen towards the riser (3,3',3'M),
the cross-section (QS) of the sprue (4,4',4'') is approximately half the size of the cross-section of the riser (TS). 4. Gate features in a die casting mold according to claims 1 to 3, characterized, that the metal flow - whether liquid or doughy - can be controlled in terms of transport speed.