# US 11,897,055 B2 · Balance adjustment method for rotor and turbocharger > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,897,055 B2 - Document ID: US11897055B2 - Status: Granted - Kind: B2 - Application number: 17/762,531 - Filed: 2019-11-12 - Published: 2022-10-27 - Granted: 2024-02-13 - Earliest claimed: 2019-11-12 - Assignees: Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. - Applicants: Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. - Inventors: Kazuki Matsushita; Hideyuki Kumagai; Hiroyuki Kadono - Web page: https://patentgrep.com/patent/US11897055B2 ## CPC - B23K 26/36: Removing material (B23K26/55, B23K26/57 take precedence) - F01D 5/10: Anti- vibration means {(specially adapted for radial flow machines or engines F01D5/04)} - B23K 26/03: Observing, e.g. monitoring, the workpiece - B23K 26/082: Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head - F01D 5/027: {Arrangements for balancing (for balancing rotating bodies in general F16F15/32; for compensating imbalance G01M1/36)} - F01D 21/003: {Arrangements for testing or measuring (for measuring vibrations G01H)} - F01D 25/04: Antivibration arrangements - G01M 1/225: {for vehicle wheels (in situ G01M1/28)} - G01M 1/34: by removing material from the body to be tested, e.g. from the tread of tyres - B23K 2101/001: {Turbines} - B23K 2103/08: Non-ferrous metals or alloys - F05D 2220/40: in turbochargers - F05D 2260/96: Preventing, counteracting or reducing vibration or noise - Y02T 10/12: Improving ICE efficiencies - 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 - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A balance adjustment method for a rotor includes an imbalance acquisition step of acquiring imbalance position and amount of the rotor after a first balance correction step of correcting balance of the rotor by cutting a compressor wheel side, an excision target section determination step of determining, based on the imbalance position and amount of the rotor, an excision target range including an imbalance correction position of the turbine wheel and a removal amount in the excision target range, and a second balance correction step of correcting the balance of the rotor by repeatedly irradiating the excision target range determined in the excision target section determination step with laser light from a laser marker device to remove by the removal amount from the turbine wheel. ## Claims ### Claim 1 A balance adjustment method for a rotor in which a turbine wheel and a compressor wheel are connected via a rotational shaft, comprising: an imbalance acquisition step of acquiring imbalance position and amount of the rotor after a first balance correction step of correcting balance of the rotor by cutting at least one of the compressor wheel and a nut member connecting the compressor wheel to the rotational shaft; an excision target section determination step of determining, based on the imbalance position and amount of the rotor acquired in the imbalance acquisition step, an excision target range including an imbalance correction position of the turbine wheel and a removal amount in the excision target range; a second balance correction step of correcting the balance of the rotor by repeatedly irradiating the excision target range determined in the excision target section determination step with laser light from a laser marker device to remove by the removal amount from the turbine wheel; and an excision condition determination step of determining, with reference to at least one piece of unit excision information where an irradiation frequency of the laser light and a scan speed of the laser light of the laser marker device are associated with a unit removal amount which is a removal amount per unit area, the irradiation frequency of the laser light and the scan speed of the laser light in the second balance correction step from the excision target range and the removal amount determined in the excision target section determination step, wherein the at least one piece of unit excision information includes a plurality of pieces of unit excision information each having the different scan speed with respect to the same unit removal amount, and wherein the excision condition determination step includes determining, as the irradiation frequency and the scan speed in the second balance correction step, an irradiation frequency and a scan speed of unit excision information with the highest scan speed among the plurality of pieces of unit excision information. ### Claim 2 (depends on 1) The balance adjustment method for the rotor according to claim 1, wherein the excision target range is located on a peripheral surface of a boss portion of the turbine wheel. ### Claim 3 (depends on 1) The balance adjustment method for the rotor according to claim 1, wherein each scan speed of the plurality of pieces of unit excision information is less than an upper threshold. ### Claim 4 A balance adjustment method for a rotor in which a turbine wheel and a compressor wheel are connected via a rotational shaft, comprising: an imbalance acquisition step of acquiring imbalance position and amount of the rotor after a first balance correction step of correcting balance of the rotor by cutting at least one of the compressor wheel and a nut member connecting the compressor wheel to the rotational shaft; an excision target section determination step of determining, based on the imbalance position and amount of the rotor acquired in the imbalance acquisition step, an excision target range including an imbalance correction position of the turbine wheel and a removal amount in the excision target range; a second balance correction step of correcting the balance of the rotor by repeatedly irradiating the excision target range determined in the excision target section determination step with laser light from a laser marker device to remove by the removal amount from the turbine wheel; and an excision condition determination step of determining, with reference to at least one piece of unit excision information where an irradiation frequency of the laser light and a scan speed of the laser light of the laser marker device are associated with a unit removal amount which is a removal amount per unit area, the irradiation frequency of the laser light and the scan speed of the laser light in the second balance correction step from the excision target range and the removal amount determined in the excision target section determination step, wherein the at least one piece of unit excision information includes a plurality of pieces of unit excision information each having the different scan speed with respect to the same unit removal amount, and wherein the excision condition determination step includes determining, as the irradiation frequency and the scan speed in the second balance correction step, an irradiation frequency and a scan speed of unit excision information with a minimum cycle time in the second balance correction step among the plurality of pieces of unit excision information. ### Claim 5 (depends on 4) The balance adjustment method for the rotor according to claim 4, wherein each scan speed of the plurality of pieces of unit excision information is greater than a lower threshold. ### Claim 6 A balance adjustment method for a rotor in which a turbine wheel and a compressor wheel are connected via a rotational shaft, comprising: an imbalance acquisition step of acquiring imbalance position and amount of the rotor after a first balance correction step of correcting balance of the rotor by cutting at least one of the compressor wheel and a nut member connecting the compressor wheel to the rotational shaft; an excision target section determination step of determining, based on the imbalance position and amount of the rotor acquired in the imbalance acquisition step, an excision target range including an imbalance correction position of the turbine wheel and a removal amount in the excision target range; a second balance correction step of correcting the balance of the rotor by repeatedly irradiating the excision target range determined in the excision target section determination step with laser light from a laser marker device to remove by the removal amount from the turbine wheel; and an excision condition determination step of determining, with reference to at least one piece of unit excision information where an irradiation frequency of the laser light and a scan speed of the laser light of the laser marker device are associated with a unit removal amount which is a removal amount per unit area, the irradiation frequency of the laser light and the scan speed of the laser light in the second balance correction step from the excision target range and the removal amount determined in the excision target section determination step, wherein the at least one piece of unit excision information includes a plurality of pieces of unit excision information each having the different scan speed, and wherein the excision condition determination step includes determining, as the irradiation frequency and the scan speed in the second balance correction step, an irradiation frequency and a scan speed of each of first unit excision information including a first scan speed as the scan speed and second unit excision information including a second scan speed higher than the first scan speed as the scan speed, from among the plurality of pieces of unit excision information. ### Claim 7 (depends on 6) The balance adjustment method for the rotor according to claim 6, wherein the second balance correction step includes: a former half correction step in which the scan speed of the laser light is the first scan speed; and a latter half correction step performed after the former half correction step, in which the scan speed of the laser light is the second scan speed higher than the first scan speed. ### Claim 8 (depends on 1) The balance adjustment method for the rotor according to claim 1, wherein the excision target range is located on a peripheral surface of a boss portion of the turbine wheel, as well as has a long axis along a circumferential direction of the turbine wheel and has a short axis along an axial direction of the turbine wheel. ### Claim 9 (depends on 8) The balance adjustment method for the rotor according to claim 8, wherein a condition of 1.5≤L2/L1≤100 is satisfied, where L1 is a length of the short axis and L2 is a length of the long axis. ### Claim 10 (depends on 8) The balance adjustment method for the rotor according to claim 8, wherein the excision target range includes a first excision target range and a second excision target range disposed alongside the first excision target range in the axial direction of the turbine wheel. ### Claim 11 (depends on 1) The balance adjustment method for the rotor according to claim 1, wherein the laser light of the laser marker device has an output of not greater than 100 W. ### Claim 12 (depends on 4) The balance adjustment method for the rotor according to claim 4, wherein the excision target range is located on a peripheral surface of a boss portion of the turbine wheel. ### Claim 13 (depends on 4) The balance adjustment method for the rotor according to claim 4, wherein the excision target range is located on a peripheral surface of a boss portion of the turbine wheel, as well as has a long axis along a circumferential direction of the turbine wheel and has a short axis along an axial direction of the turbine wheel. ### Claim 14 (depends on 13) The balance adjustment method for the rotor according to claim 13, wherein a condition of 1.5≤1L2/L1≤100 is satisfied, where L1 is a length of the short axis and L2 is a length of the long axis. ### Claim 15 (depends on 13) The balance adjustment method for the rotor according to claim 13, wherein the excision target range includes a first excision target range and a second excision target range disposed alongside the first excision target range in the axial direction of the turbine wheel. ### Claim 16 (depends on 4) The balance adjustment method for the rotor according to claim 4, wherein the laser light of the laser marker device has an output of not greater than 100 W. ### Claim 17 (depends on 6) The balance adjustment method for the rotor according to claim 6, wherein the excision target range is located on a peripheral surface of a boss portion of the turbine wheel. ### Claim 18 (depends on 6) The balance adjustment method for the rotor according to claim 6, wherein the excision target range is located on a peripheral surface of a boss portion of the turbine wheel, as well as has a long axis along a circumferential direction of the turbine wheel and has a short axis along an axial direction of the turbine wheel. ### Claim 19 (depends on 18) The balance adjustment method for the rotor according to claim 18, wherein a condition of 1.5≤L2/L1≤100 is satisfied, where L1 is a length of the short axis and L2 is a length of the long axis. ### Claim 20 (depends on 18) The balance adjustment method for the rotor according to claim 18, wherein the excision target range includes a first excision target range and a second excision target range disposed alongside the first excision target range in the axial direction of the turbine wheel.