DE1964943A1 - Composite bearing material - Google Patents

Description

KARL SCHMIDT GMH Frankfurt (Main), December 17, 1969

7107 Neckarsulm DrQ / GKp

Christian-Schmidt-Str. 8 / i2

Prov. Wr. 6341 ES

Verbundlag acquired from f

The invention "relates to a composite bearing material "Consists of a polyamide-based plastic running layer applied to a metallic support material as well as a process for its production,

All moving machine parts must be guided or stored to be able to transfer forces. This will be a small one Ileibungswi the stand and wear strived to achieve an optimal To achieve running behavior. For dry running and under operating conditions with insufficient lubrication, plastics have become proved to be particularly suitable, since these have good compatibility with the metallic counter-material.

These properties have opened up a widespread use of polyamides as plain bearing materials in technology, for example. The commercially available polyamides, however, show a sharp drop in their strength with temperature, so that sliding surface temperatures of at most 50 to 60 ⁰ O can be controlled with them. As a result of this comparatively low temperature resistance, the use of polyamides for temperatures above 60 G is not suitable. As soon as this load is exceeded, the running behavior of the corresponding bearing material deteriorates considerably, since the deformation level fills up strongly *

It is also known to increase the dimensional stability of a

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To apply bearing polyamides to a metallic support sciaale and between the polyamide layer and the support shell, a porous layer made of spherical or spattered material Sinter bronze powder and then the porous bronze grille to be completely filled with polyamide in a rolling process. On this filled bronze layer is at the same time a 10 to 30 pm thick overlay made of polyamide is applied (Franssen, H.ί VDI-Z. Vj [O (1968) No. 15, Page 632/636),

Apart from the fact that the manufacturing costs for a plain bearing material constructed in this way are not insignificant are, exists in the last-mentioned embodiment the main disadvantage is that due to the comparatively small running layer thickness over the tips of the bronze layer machining of the running layer only in narrow limits is possible.

The invention is now based on the object of eliminating the disadvantages of the prior art listed above and, in particular, of developing a metal-plastic composite bearing material in which the thickness of the plastic running layer is at least 50 μm and its resistance to deformation at continuous temperatures of up to 600 ⁰ C decreases only insignificantly, so that optimal running behavior is guaranteed up to the specified temperature limit.

This gave up is achieved according to the invention in such a way that the running layer of a unsaturated by polycondensation of diesters of aliphatic dicarboxylic acids with aliphatic and / or aromatic diamines in the presence of N-methylpyrrolidone, optionally with the addition of crosslinking agents polycondensate produced that at least 5 percent _a $ copolymerized Contains N-methylpyrrolidone, consists "

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The thickness of the plastic running layer is expediently "up to 200 μm, preferably" up to 120 μm, in particular 50 to 60 μm. In the context of a special embodiment of the invention, for further improvement of the running behavior, the applied plastic running layer can contain oil of 0.02 to 0.2 YoI. ^C / b, preferably 0.1 YoI. F ° t .

In order to achieve special sliding properties, the plastic overlay contains, according to a further feature of the invention, one or more slip-facilitating fillers in amounts of up to 50% by volume, preferably 10 to 40% by volume, in particular 20 to 30% by volume. Lead, white metal, bronze, aluminum alloys, silver, silver alloys, zinc alloys, graphite with a grain size of <33 μm and plastics are preferably used as slip-relieving fillers. However, the deformation resistance can go back Depending on the type of filler in the heat at temperatures from 375 to 4OQ ⁰ C.

The process for producing the composite bearing material according to the invention is carried out in such a way that the precondensate adjusted to the desired viscosity, if necessary after adding one or more glide-free fillers, is applied to the metallic support material and then in a first stage at a temperature of 150 ⁰ G 15 to ~ 60 minutes and in a second stage at a temperature of around 20 ° G for 20 to 60 minutes «

For the production of extremely thick running layers is It is appropriate to apply the precondensate in several layers, with the lower layers each not up be fired to fully harden and the complete hardening of the entire structure only with the last baking process he follows. ■

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To further improve running behavior, the the metallic support material applied plastic barrel ' Layer are subjected to a vacuum treatment in oil, whereby the plastic absorbs small amounts of oil.

Although the applied plastic overlay adheres well to the smooth surface of the metallic support material, it is advisable for extreme loads to roughen the support material before applying the overlay, emboss it like a waffle or provide it with a porous sintered bronze layer. _s

The plastic running layer applied to the metallic support material is mechanically very resistant, but still has excellent toughness and excellent resistance to a wide variety of agents. Even at high stress temperatures of up to 60Q ^D C, the running layer largely retains its good running properties. A further advantage results from the fact that the running layer enables machining so that the desired finished dimension can be produced by turning or milling *.

- 5 claims

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Claims (9)

PARTY CLAIMS, 1) Composite bearing material consisting of a plastic overlay based on polyamide applied to a metallic support material, characterized in that the overlay consists of a poly-condensation .von diesters of unsaturated aliphatic dicarboxylic acids with aliphatic and / or aromatic diamines in the presence of H-methylpyrrolidone, optionally with the addition of crosslinking substances produced polycondensate which contains at least 5 wt. ^a / o copolymerized H-methylpyrrolidone, is, 2) composite bearing material according to claim 1, characterized in that the thickness of the plastic overlay is up to 200 μm, preferably up to 120 μm, in particular 50 to 60 μm. 3) composite bearing material according to claims 1 and 2, characterized in that the overlay contains 0.02 to 0.2 vol. ^, Preferably 0.1 "vol. # Oil. 4) composite bearing material according to claims 1 to 3 » characterized in that the overlay contains one or more slip-facilitating fillers in amounts of up to 50 vol. ^, Preferably to 40 vol.,? F, in particular 20 to 30 vol, <fo . 5) composite bearing material according to claims 1 to 4 » characterized in that the slip-relieving JjHillötoffe are made of lead, white metal, bronze, aluminum alloy, silver, silver alloys, zinc alloys, graphite in a grain size of <C 33 pm and plastics, . - 6 .: -> - 109827/1702 1984943 6) Process for the production of the composite bearing material according to claims 1 to 5> characterized in that 'the pre-condensate adjusted to the desired viscosity,' optionally after admixing one% or more slide-facilitating fillers, applied to the metallic support material, in a first stage at temperatures to 150 ⁰ C 50 to 60 minutes and in a second stage at temperatures around 200 ° C for 30 to 60 minutes long is baked, 7) The method according to claim 6, characterized in that the precondensate is applied in several layers for the production of extremely thick running layers, the lower layers are not burned until completely hardened and the complete hardening of the entire structure is only carried out during the last burn-in process. 8) Method according to claims 6 and 7, characterized in that the running layer is subjected to a vacuum treatment in oil. 9) Method according to claims 6 to 8, characterized in that the metallic support material is roughened, waffle-like or provided with a porous sintered bronze layer on its surface to be coated before the precondensate is applied. 109827/1702