# US 2014/0360247 A1 · Method for manufacturing an extrusion die > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0360247 A1 - Document ID: US20140360247A1 - Status: Published application - Kind: A1 - Application number: 14/300,562 - Filed: 2014-06-10 - Published: 2014-12-11 - Earliest claimed: 2013-06-10 - Assignees: WEFA Singen GmbH - Applicants: WEFA Singen GmbH - Inventors: Oliver Maier; Joachim Maier - Web page: https://patentgrep.com/patent/US20140360247A1 ## CPC - B21C 25/02: Dies - B21C 25/025: {Selection of materials therefor} - B23K 9/04: Welding for other purposes than joining, e.g. built-up welding - B23K 9/23: taking account of the properties of the materials to be welded - B23K 28/02: Combined welding or cutting procedures or apparatus - B23P 15/24: dies (B21C3/18, B21C25/10, B21D37/20 take precedence) - G01N 3/56: Investigating resistance to wear or abrasion - B23K 2103/04: Steel {or steel} alloys - B23K 2103/08: Non-ferrous metals or alloys - B23K 2103/18: Dissimilar materials - B23K 2103/26: {Alloys of Nickel and Cobalt and Chromium} - B21C: MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL - B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM - B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q) - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) ## Abstract Method for producing an extrusion die having a functional surface for metal extrusion material, comprising the following steps: providing a die support body, depositing a weldable substance containing cobalt and/or nickel onto a subsection of the die support body by means of an effective bonding application process to produce an inseparable deposition layer, machining the deposition layer in a chipping and/or material removal process to form the functional surface of the extrusion die, and carrying out a CVD coating process with a reaction gas at least on the functional surface. ## Claims ### Claim 1 Method for producing an extrusion die having a functional surface for metal extrusion material, comprising the following steps: providing (10) a die support body (50), depositing (14) a weldable substance containing cobalt and/or nickel onto a subsection of the die support body by means of an effective bonding application process to produce an inseparable deposition layer (52), machining (20) the deposition layer in a chipping and/or material removal process to form the functional surface (54) of the extrusion die, and carrying out a CVD coating process (22) with a reaction gas at least on the functional surface. ### Claim 2 (depends on 1) Method according to claim 1, wherein the effecting bonding application process has the form of single- or multilayer build-up welding (14). ### Claim 3 (depends on 1) Method according to claim 1, wherein the tool support body with the applied deposition layer undergoes heat treatment (16), particularly a heat treatment process to reduce internal stresses before the machining operation for chipping and/or material removal. ### Claim 4 (depends on 3) Method according to claim 3, wherein the heat treatment process reduces internal stresses before the machining operation for chipping and/or material removal. ### Claim 5 (depends on 1) Method according to claim 1, wherein the machining operation for chipping and/or material removal is carried out by milling or eroding in a spark erosion process (20). ### Claim 6 (depends on 1) Method according to claim 1, wherein a preliminary forming and/or preliminary chipping operation (12) is carried out on the die support body in the area of the subsection, before the application layer is created. ### Claim 7 (depends on 1) Method according to claim 1, wherein the die support body made from a hot work steel undergoes a preheating step, to a temperature between 400° C. and 700° C. and/or to an annealing temperature of the hot work steel before the application layer is created. ### Claim 8 (depends on 1) Method according to claim 1, wherein the die support body is preheated before the cobalt-containing material is applied and/or the die support body furnished with the application layer undergoes a stress relief heat treatment. ### Claim 9 (depends on 1) Method according to claim 1, wherein the cobalt-containing material selected is a non-ferrous alloy having a cobalt base and/or a nickel base. ### Claim 10 (depends on 9) Method according to claim 9, wherein the cobalt base is a cobalt-chromium base. ### Claim 11 (depends on 1) Method according to claim 1, further comprising a heat treatment (24) of the die support body after the CVD coating process at an annealing and/or artificial ageing temperature. ### Claim 12 (depends on 1) Method according to claim 1, wherein the single- or multilayer CVD coating process is carried out as a medium-temperature process at a coating temperature in a range between 700° C. and 950° C., and/or as a high-temperature process at a coating temperature above 950° C., in order to create a covering layer on top of a CVD coating that is produced by the medium-temperature process. ### Claim 13 (depends on 12) Method according to claim 12, wherein the coating temperature is above 1000° C. ### Claim 14 (depends on 1) Method according to claim 1, wherein the extrusion die is produced as a tool comprising two parts, having a mandrel part and a die plate and the inseparable application layer is applied to at least sections of both the mandrel part and the die plate. ### Claim 15 (depends on 1) Method according to claim 1, wherein the functional surface is created as the delimiting wall of the extrusion die defining a guide and/or flow channel for the ductile extrusion substance. ### Claim 16 Method for measuring surface wear of an extrusion die, comprising the steps of: producing a first sample as the extrusion die with a coating, bringing the first sample into contact with a friction partner that comprises an aluminium alloy, particularly an alloy used to create an aluminium extrusion substance, which acts on the first sample by relative rotation at a predetermined or adjustable relative rotating speed and under predetermined or adjustable pressure, recording a surface wear condition of the sample after at least one preferably predetermined interaction time, and comparing the wear condition or a time period assigned to a predetermined or defined wear condition with values recorded by the method for a second sample having a different coating. ### Claim 17 (depends on 16) Method according to claim 16, further comprising the transfer and/or extrapolation of a ratio between measurands, particularly a chronological ratio, between the second and the first samples in order to determine, define or forecast the surface wear behaviour of said extrusion die. ### Claim 18 (depends on 1, 16) Method according to claim 16, wherein the producing step comprises the method according to claim 1.