DD214543A1 - DEVICE FOR PRODUCING DOSED BALL-FILLED METAL GRANULES - Google Patents

Abstract

The invention relates to a device for producing metered spherical metal granules of unalloyed or alloyed molten metal, preferably of soft solder. The invention is based on the object, metered spherical metallic granules of unalloyed or alloyed metal, preferably from soft solder, to about 5 mm diameter at high density, small diameter differences and good roundness to create a small footprint. According to the invention, the object is achieved in that the metal is supplied in solid or liquid form to a heatable storage container, the melt is slightly heated to melting temperatures and in this state passes through a metering device and in droplet form through a preferably ceramic connecting tube with / without controllable heating device with exclusion of air falls into a cooling liquid of a collecting container and is completely solidified until it reaches the bottom of the collection container or the already solidified metal granules. The removal of the solidified granules can be done directly from the collecting container or mechanically or by a geschraeg soil with a lower connection to a second collecting container or by a rotating cylinder valve with recesses for the granules.

Description

a) Title of the invention

Device for the preparation of metered spherical metal granules

b) Field of application of the invention

The invention relates to a device for Her

Positioning of metered spherical metal granules of unalloyed or alloyed molten metal, preferably soft solder.

o) Characteristic of the known technical solutions

A large number of devices are known in which the unalloyed or alloyed molten metal is supplied from a casting device to a storage container and held at the melting temperature by a heating device. Also known is unle

To supply gated or alloyed metal in a non-liquid state to a reservoir and only then initiate the melting process and to keep it at melting temperature.

To achieve a homogeneous microstructure of the melt «

In larger and larger storage tanks, a Ruhrwerk is required.

Often there are non-replaceable or replaceable calibrated bore inserts in the bottom of the reservoir, the bore diameter

and the bore length passage is decisive for the size of the melt passing through in the form of drops. It can be worked with atmospheric pressure or pressure in the reservoir.

To achieve a spherical falling Sohmelztropfens to 5 mm Burohmesser until complete solidification of the same is a shaft or cooling tower with a height up to 30 merfor-.5 '·· derlich.

From DD-AP 155 958 a device is known in which, for the production of metal granules, the molten metal mass is distributed through a vibrating opening of a storage container in drops which pass through a cooling shaft with counter-gas

The height of the cooling shaft must be up to about 11 m, so that the metal drops reach the lirstarrungstemperatur. Similar solutions include US Patent No. 3646 ₉ 17Y 3,771,929 or OH-PS 625,729.

Further known from the DB-AS 2 530 102 is a metering device, which consists of two rotationally symmetrical bodies provided with bores "wherein a body thereof rotates and, in congruent bores, the molten metal through the

Drilling can occur and drops in drop form. A disadvantage of the known solutions is the technical complexity, the volume of the system, the complex control devices and the ζ. Έ «high susceptibility to failure of the devices.

d) Object of the invention

The invention aims to eliminate the disadvantages inherent in the known solutions and at the same time to provide an improved and simplified device.

β) Presentation of the essence of the invention

The invention has for its object to obtain a spherical metallic granules, mainly of unalloyed or alloyed lead or tin, up to a diameter of about 5 mm with high density and good rounding degree with low space requirement of the plant · According to the invention the object is achieved in that the metal is supplied in liquid or solid form, preferably in the form of a rod, to a storage container which is supplied by a controllable heating device, ζ. B. an electric heater, is surrounded and without or a heat bar, which protrudes into the reservoir, is equipped for faster melting of the solid Metalllee.

The heater is equipped so that the melting temperature is slightly exceeded. At the straight or downwardly curved bottom of the reservoir there is a short pipe connection to a metering device, so that only a minimal temperature gradient occurs in this line piece, so that the metering device can not be done by a so-called gluing by the melt.

Depending on the setting of the metering occurs a correspondingly smaller or larger molten metal drops * from the metering device in a connecting pipe in a filled with coolant collecting container. The cooling liquid is preferably water *

In order to obtain a spherical metal granules having a uniform bulk density, it is necessary that the connecting pipe be comprehensively communicated with the surface of the cooling liquid. At a

Metallgranulatdurehiaesser Isis 5 mm and a Sehmelatropfenzahl of about «150 pieces / min, the surface of the cooling liquid may be slightly in motion. Also in this Pail must at least due to the adhesive force

   · .- ·. , · ..

between the connection tube and the surface

the cooling liquid is an air inlet between

both are avoided.

The drop height of the molten metal droplet in the cooling liquid must be so great that

hit the bottom of the collection container or ^! of the already solidified granules contained therein, the Jfietlsohmelztropfen has cooled down so that the granules in their spherical form do not undergo any formation. DerKühlflüssigkeitsspiegel

and the cooling liquid temperature must therefore be kept constant *

The reducing or ball valve of the metering device can be operated manually or mechanically for metering of the metal melt drop and should consist of a

Material exist that has a low adhesion to the liquid metal.

To maintain the melting temperature of the metal drop ens to the entry into the cooling liquid is preferably the connecting pipe between Do

Ceramic and cooling liquid made of ceramic »ES can also be an additional adjustable heating device surround the connection pipe»

The bottom of the collecting container may be flat or with a downwardly truncated cone approach and

cylindrical valve with recesses for receiving the discharged metal granules or a

inclined bottom be provided with a drain hole to manually or mechanically remove from another Bebälter the solidified metal granules.

You thereby exiting coolant can be returned to the collection container ·

t) Aueführung example

The invention will be explained in more detail below with reference to an exemplary embodiment. In the attached drawings:

Pig. FIG. 1t shows an echematic representation of the device according to the invention, FIG.

FIG. 2 t is an illustration of the distance of the

metallic granules by means of recesses of a rotating cylindri

valves.

The door according to the invention has, according to Fig. 1 a Torratsbehälter 2 for the melt and a metal feed 1, the z. B. as solid

Metal bar is represented «By the controllable

Heater 3 »which is located outside of the reservoir 2, the molten metal is kept slightly above its melting temperature«, The molten metal passes through the connecting pipe 5 in the metering device 6, which consists of a

mechanically or electrically actuated reducing or ball valve exists. A metered metallic melting drop falls through a connecting tube 7 whose inner diameter is slightly larger than the one

Diameter of the solidified metal granulate and

The temperature gradient is minimized by a temperature control device 8 and the metal melt drops with exclusion of air into the cooling liquid 10 of the collecting container 9 whose cooling liquid level is kept constant by an overflow 11 as well as the temperature of the coolant. Poeition 12 represents a controllable Kühlflussigkeitszulaüf ·

In the case of a soft solder E-BbBl 50 Sn 12.5 OD 12.5 and a granule diameter of 3 × 5 mm, the height of fall arrest is 400 mm ·

71g. FIG. 2 shows the lower part of the receptacle with a downwardly truncated cone-like configuration ending in a rounding in which a cylindrical rotating valve 14 in its recesses surrounds it. Picks up metal granules and forwards them to the outlet connection 15 *

Claims (2)

Erfinduhgsansprttch Device for producing metered spherical metal granules of unalloyed or alloyed molten metal, preferably of lead or tin alloys, so-called soft solders, characterized in that the metal (1) is in liquid or solid form, preferably rod form, a storage container (2 ) is supplied by a controllable heating device (3), which surrounds the storage container (2) or is melted by a heater, the heating device (3) into the storage container (2) and kept slightly above the melting temperature, at the bottom of the Reservoir a short pipe connection (5) leads to a metering device (6), the metering device (6) is operated manually or automatically / dropping through the metering device (6) molten metal droplet through a connecting pipe (7), if necessary, by an additional controllable heating device (8) the molten metal drop to melting temperature to z for entry into a cooling liquid (10) in a collecting container (9) holds; the connecting pipe (7) is in communication with the cooling liquid (10), so that no connection of the molten metal droplets with the outside air can occur and the drop height of the molten metal droplet in the cooling liquid (10) is so large that a secure spherical solidification of the metal ohmic droplet occurs and the coolant level as well as the coolant ** temperature by controlled inlet (12) and outlet (11) and a device for Kühlflüssigkeite * · temperature control is kept constant. 2 device according to point 1 », characterized in that the metering device is a mechanically or electrically actuated reducing valve, 3 »Device according to item 1 and 2, characterized in that the metering device is a mechanically or electrically operated ball valve * 4. Apparatus according to items 1 to 3 * characterized gekenm «- characterized in that the adhesion between the Metering device and the molten metal is low < 5 device according to items 1 to 4, characterized in that the connecting tube (7) is preferably made of ceramic. 6 "device according to point 1 to 5", characterized in that the bottom of the collecting container (9) formed downwardly frusto-conical and cylindrical at the end in a horizontal position and in this recess a rotating cylindri - cal valve (14) with recesses for receiving of the metal granules to be discharged (15) is present and on the rotating cylindrical valve ...- (14) an outlet clip (15) is connected , Device according to points 1 to 5 _t, characterized in that the bottom of the collecting container (9) is inclined and at the lowest point a bore is present, through which the solidified metal granules (13) falls into a lower-lying container from which the removal of the solidified metal granules (13) takes place manually or mechanically. Θ. Device according to point 1 to 5, characterized in that the bottom of the collecting container (9) is formed downwardly frusto-conical and a pipe for removing the metal granules is followed. 9. Device according to item 1, 6 to 8, characterized in that the from the collecting container (9) exiting cooling liquid (10) the collecting «container (9) is fed again. For this ι SaSta Zelchnwggn