METHOD FOR PRODUCING A PRECISION RAIL AND A PRECISION RAIL GUIDE, AND PRECISION RAIL AND PRECISION RAIL GUIDE

Abstract

A production method produces a precision rail having a raceway region. The material for producing at least one part of the raceway region is deposited onto a component by laser beam build-up welding and/or electron beam build-up welding. The methods results in short processing times being achieved when the precision rails concerned are produced.

Claims

1. A method for producing a precision rail, which comprises the steps of: providing a component; and forming a raceway region, material for producing at least one part of the raceway region being deposited onto the component by laser beam build-up welding and/or electron beam build-up welding.

2. The method for producing the precision rail according to claim 1, wherein the material is deposited in one layer or in multiple layers.

3. The method for producing the precision rail according to claim 1, wherein the material contains rolling-bearing steel and/or tool steel and/or high-speed steel and/or at least one high-alloy steel and/or 100Cr6 and/or 100CrMnSi6-4 and/or 100CrMo7-3 and/or 100CrMnMo8 and/or 110MnCrTi8 and/or 80MoCrV42-16 and/or X30CrMoN15-1 and/or X2CrNiMol 7-12-2 and/or X45CrSi9-3.

4. The method for producing the precision rail according to claim 1, wherein the component is formed at least partially of structural steel, heat-treatable steel and/or cast iron and/or a steel S185 and/or a steel S235 and/or a steel S275 and/or a steel S295 and/or a steel S355 and/or a steel S460 and/or steel C22 and/or nodular cast iron and/or austenitic-ferritic spheroidal-graphite cast iron.

5. The method for producing the precision rail according to claim 1, wherein the component is a main body of the precision rail.

6. The method for producing the precision rail according to claim 1, wherein the material forms a layer which has a thickness of less than 3 mm.

7. The method for producing the precision rail according to claim 1, wherein the material is provided as a wire and/or a strip and/or a powder.

8. The method for producing the precision rail according to claim 1, wherein various materials including the material are deposited in one layer or in multiple layers.

9. The method for producing the precision rail according to claim 1, wherein the material forms a layer which has a thickness of less than 2 mm.

10. The method for producing the precision rail according to claim 1, wherein the component and the raceway region form the precision rail being at least one rail of a precision rail guide.

11. A method for producing a precision rail guide, which comprises the steps of: producing a precision rail by the sub-steps of: providing a component; and forming a raceway region, material for producing at least one part of the raceway region being deposited onto the component by laser beam build-up welding and/or electron beam build-up welding.

12. A precision rail for a precision rail guide, the precision rail comprising: at least one part of a raceway region being formed by a layer; and a region disposed directly adjacent to said layer, said layer having a higher metallurgical grade than a material of said region disposed directly adjacent to said layer.

13. A precision rail guide, comprising: a precision rail, containing: at least one part of a raceway region being formed by a layer; and a region disposed directly adjacent to said layer, said layer having a higher metallurgical grade than a material of said region disposed directly adjacent to said layer.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0011] The FIGURE of the drawing is an illustration showing a precision rail in an incompletely produced state according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

[0012] Referring now to the single FIGURE of the drawings in detail thereof, there is shown a view of an end side of a precision rail in a state in which a first raceway region 10 and a layer 18, which forms a second raceway region 11, have yet to be deposited onto a component 12 of the precision rail. Spatial boundaries of the layer 18 and of the raceway region 10 are shown by dashed lines in the FIGURE. The component is a main body of the precision rail and, in an incompletely produced state of the precision rail, has a mass of more than 70% of the total mass of the precision rail.

[0013] In the method for producing the precision rail, material for producing the raceway region 10 is deposited onto the component by laser beam build-up welding (also referred to as laser cladding). For this purpose, the material, in the form of a welding wire that can originate continuously from a coil, is liquefied in a manner spatially adjacent to a region 16 of the component provided to support the raceway region 10, wherein the liquefied wire is applied to the region 16 in a meandering manner and immediately solidifies. In order that a main body has the desired temperature immediately before the application of the material, the main body can be preheated or precooled. When applying the material to the region 16, the volume of the main body ensures a desired cooling rate in the applied material, such that a fine-grained martensitic microstructure having a hardness in the range of greater than 55 HRC is obtained. Thus, hardening of the raceway region 10 takes place together with the application of the material, saving process costs and time. Finally, the raceway region 10 is a layer which consists of the material, has a thickness of approximately 1 mm and is fastened to the component in a material-bonded manner.

[0014] In addition, a thermal pre-treatment and/or post-treatment and a subsequent heat treatment for improving the microstructure properties and strength properties, in particular of the surface layer and transition layer of the raceway region 10, can also take place.

[0015] A laser beam is used to liquefy the wire. In an alternative embodiment of the invention, an electron beam, instead of the laser, is used continuously (electron beam build-up welding, also known as electron beam cladding).

[0016] The wire can in particular be made of rolling-bearing steel, tool steel, high-speed steel, a high-alloy steel, such as e.g. 100Cr6 (material number 1.3505), 100CrMnSi6-4 (100CrMn6, 1.3520), 100CrMo7-3 (1.3536), 100CrMnMo8 (1.3539), 110MnCrTi8 (1.8425), M50 (80MoCrV42-16, 1.3551), Cronidur 30 (X30CrMoN15-1, 1.4108), X2CrNiMo17-12-2 (1.4404) or X45CrSi9-3 (1.4718).

[0017] Overall, for the method described, in particular in the case of laser beam build-up welding, for example a powder or a strip can also be used instead of a wire. A relatively large selection of materials (welding fillers) is already available in powder form, because powder can be produced more easily than a wire or a strip. Multiple materials can also be deposited together or in a manner layered in multiple layers one on top of another by the build-up welding according to the invention. For this purpose, for example wires or powders made of different materials or else powder mixtures are used.

[0018] The component consists of cast iron (e.g. nodular cast iron, GJS, or austenitic-ferritic spheroidal-graphite cast iron, ADI). In other embodiments of the invention, the component can consist, for example, of structural steel or heat-treatable steel, thus for example steel S185, steel S235, steel S275, steel S295, steel S355, or steel S460 (various variants and material numbers are possible in each case, e.g. S235JR, S235JRG1, S235JRG2) or steel C22 (1.0402). Thus, the layer 14 consists of a material of higher grade than the material of the component, i.e. in particular a relatively high lifetime can be expected with rolling stress (surface layer stress). Since the layer 14 and the main body are made of various ferrous materials, they bond well in a material-bonded manner with one another.

[0019] A layer 18 forming the second raceway region 11 is produced analogously to the layer 14. After production of the precision rail has been completed, the precision rail and a further rail are joined together in a known manner with rolling bodies (not shown), which are formed by rollers in the present case, to give a complete precision rail guide.

LIST OF REFERENCE SIGNS

[0020]

TABLE-US-00001 10 Raceway region 11 Raceway region 12 Component 14 Layer 16 Region 18 Layer 20 Thickness