DE2510599A1 - PROCESS FOR MANUFACTURING SLIDING BEARING MATERIAL - Google Patents

Description

Process for the production of plain bearing material

The invention relates to a method for producing plain bearing material, which is preferably used for production is used by maintenance-free plain bearings Laminates made from fabric layers impregnated with phenolic resins have long been used as a material for low-maintenance bearings exist, known. Bearings manufactured in this way must, however, be lubricated through additional storage of suitable lubricants, usually polytetrafluoroethylene (PTFE), in such Press materials to improve the running properties quite significantly. Decisive for the excellent property of the The distribution and amount of PTFE in the laminate are maintenance-free. However, the incorporation of PTFE is only under considerable technological and technical effort can be achieved. For this purpose, it is known to produce fabric for bearing laminates, the individual PTFE threads contain · Apart from the extremely complex production of such a thread Fabric as a result of the additional operations, such as ζ · Β · thread production and winding, are the maintenance-free properties not entirely satisfactory due to insufficient fine distribution of the PTFE.

Furthermore, it is known to add powdered PTFE to liquid phenolic resin solutions in order to be used in the known Way to impregnate the fabric

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In the normal manufacturing process, however, PTFE has a particle size over 0.4 ram. Milling processes can only reduce the size of the particles down to a grain size of 0.2 ram achievable · Insurmountable difficulties arise in the production of a homogeneous impregnation liquor, whose PTFE content should remain constant, as the PTFE has the disadvantageous property of settling in the liquid «

To avoid this deficiency, it has already been proposed to manufacture PTFE with an ultrafine particle size below 5 mm to use an impregnation solution With constant use of agitators, it should be possible in this case, to keep the particles in the necessary suspension

Only special and complex manufacturing processes produce these necessary microparticles, which is why PTFE uses them extremely small grain sizes are much higher in price than larger types

Another disadvantage of working with resin solutions is the large number and complexity of the necessary process steps when adding binders (phenolic resins) and lubricants (PTFE)

All known processes have the common disadvantage that all solid phenolic resins are used by solvents for the impregnation process must be converted into liquid form, after which the solvents must be removed again These solvents are mostly poisonous, flammable gases which, when combined with air, form explosive mixtures, for the elimination of which post-combustion systems are necessary.

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The purpose of the invention is to provide a method that enables storage of synthetic resin and PTFE into the carrier material in a simple way, bypassing the impregnation process and thus the Solution production and at the same time allows the use of cheaper PTFE powder.

The invention is based on the object of developing a method which enables the uniform introduction of powdery Synthetic resin or normal-grain PTFE together with the synthetic resin in the textile carrier material at its Production permitted and further processing into plain bearing material enabled

According to the invention, this is done in that the textile carrier material Fiber or filament webs, which preferably consist of high polymers, are used in which powdery Synthetic resins or a synthetic resin-PTFE mixture are entered and the carrier material treated in this way becomes a plain bearing material is pressed

The synthetic resins used are preferably curable powdery ones Phenolic resins used

In the production of plain bearing material using pure powdered resin, the proportion of the resin IO% is - 50% of the total mass · When using a synthetic resin PTFE mixture is the PTFE content of 5% - 25% _t during the synthetic resin content 10% - 50 %, based on the total mass, is · A normal PTFE with a grain size of max · 0.4 mm is used · According to the invention, the powdery synthetic resin-PTFE mixture is uniform

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in the specified amount on the textile carrier material applied

The scattered powder can also be squeegee or Brushes can be distributed in the fleece · Another possibility of distribution is provided by shaking movements or the Use of suction or compressed air

In addition, the powder mixture can be carried into the inside of the fleece with the help of needles, preferably felting needles, in a needle machine the mixing of the synthetic resin-PTFE mixture at the same time the most necessary consolidation of the fiber or thread fleece is achieved. the stored mixture can be made, whereby the Heat treatment up to max · to the melting point of the resin used «

The advantages achieved with the method according to the invention consist in particular in the saving of costly process steps in the production of laminates and the Possibility of using cheap starting materials · In addition, the prepared by the process according to the invention has Material excellent properties in terms of maintenance-free bearing running on «

The invention is to be explained in more detail below using exemplary embodiments «Example 1;

2 1 m of a filament nonwoven based on polycap

roamid with a basis weight of 2QQ g / in ² is 7Q g

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powdery "phenolic resin uniformly coated by knife coating · By routierende brushes, the sprinkled powder is partially incorporated in the layer» In one equipped with Feitingnadeln needle machine, the fabric having 100 stitches / cm ² is needled and thereby completely worn the phenolic resin in the nonwoven fabric interior "At the same time so that A solidification of the fleece is achieved · The fleece is now exposed to a temperature of 60 ° C. This fixes the powder introduced in the fleece. The treated fleece is cut or wound to the desired size and pressed at a temperature of 160 ° C. and a pressure of 50 kp / cm to form plates or tubes and rods. The desired slide bearings are produced by machining the plates or tubes.

Example 2;

1 m of a nonwoven fabric based on polycaproamide with a

Weight per unit area of 200 g / m is made with a powdery mixture made of 60 g phenolic resin and 30 g PTFE evenly by knuckling on coated and processed as in Example 1

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Claims (1)

Claims lJ Process for the production of plain bearing material, which ^ preferably for the production of maintenance-free slide bearings is used, characterized in that in a fiber or filament web, which is preferably made of It consists of high polymers, a powdery synthetic resin or a synthetic resin-PTFE mixture and added to plain bearing material is pressed. 2 · The method according to claim 1, characterized in that the Powdery synthetic resin-PTFE mixture evenly by squeegeeing distributed on the fleece and distributed into the fleece by brushing, suction or compressed air or shaking. 3 · Method according to claim 1 to 2, characterized in that for better distribution in the fleece and for consolidation of the fiber and thread fleece needling in a needle machine takes place and then the total product of a heat treatment up to max · the melting point of the resin used he follows· 4. Method according to claims 1 to 3, characterized in that when using pure powdery synthetic resin the proportion of synthetic resin is 10 % - 50 % to the total mass and when using a powdery synthetic resin-PTFE mixture the PTFE proportion is 5 % - 25% % and the synthetic resin content is IO % - 50 % based on the total mass. 5. Method according to claims 1-4, characterized in that PTFE with a grain size of up to 0.4 mm is used. rr, ο 8 4 ^ _; ? Γί f *? ^