| 摘要 |
The invention relates to a method for preparing metal workpieces for cold forming by applying a lubricant layer either to a metal surface or to a metal surface which has been pre-coated with e.g., a conversion coating. The lubricant layer is formed by contacting the surface with an aqueous lubricant composition which has a content in at least two waxes having distinct properties and a content in organic polymer material, the organic polymer material used predominantly being monomers, oligomers, co-oligomers, polymers and copolymers based on ionomer, acrylic acid/methacrylic acid, epoxide, ethylene, propylene, styrene, urethane, the ester or salt thereof. The invention to the corresponding lubricant composition, to the lubricant layer produced thereof and to its use. |
| 主权项 |
1. A process for the preparation of metallic workpieces for cold forming by applying a lubricant layer coating either on to a metallic surface or on to a pre-coated metallic surface and then coldforming the resultant coated metallic workpiece, wherein the lubricant layer is formed by contacting the surface with an aqueous lubricant composition which comprises a water-soluble, water-containing or water-binding oxide or silicate, at least two different waxes having different melting ranges, melting points or viscosities, an organic polymeric material that is an ionomer having a content of free or associate ions, wherein the organic polymeric material is selected from the group consisting of a polymer and a copolymer based on an ionomer having a content of free or associate ions, and
a non-ionomeric organic component based on a member selected from the group consisting of an acrylic acid, a methacrylic acid, an amide, an amine, an aramid, an epoxide, an ethylene, an imide, a polyester, a propylene, a styrene and a urethane, and esters or salts thereof, wherein the coating formed from the lubricant composition has several consecutive softening ranges or softening points or melting ranges or melting points over a temperature range, which is passed through when the metallic workpiece heats up as a result of the coldforming so that there is a substantially continuous change or an approximately graduated change in the thermal or mechanical properties or the viscosity of the coatings during the cold forming, and wherein the water-soluble, water-containing or water-binding oxide or silicate is selected from the group consisting of water glass, silica gel, silica sol, silica hydrosol, silicic acid ester and ethyl silicate, wherein the non-ionomeric organic component is at least one member selected from the group consisting of an oligomer, a polymer and a copolymer; wherein the ionomer is based on a member selected from the group consisting of acrylic acid, methacrylic acid, ethylene, propylene and styrene, or an ester or a salt thereof, wherein the ionomer is a copolymer; and wherein the ionomer is a polyelectrolyte. |
