公开(公告)号：US20230330730A1

公开(公告)日：2023-10-19

申请号：US18139377

申请日：2023-04-26

Applicant: BEIJING INSTITUTE OF TECHNOLOGY

Inventor： Pei YAN ,  Jie SUN ,  Lei FAN ,  Xibin WANG ,  Li JIAO ,  Tianyang QIU ,  Wenxiang ZHAO ,  Tianfeng ZHOU ,  Zhibing LIU ,  Lijing XIE ,  Bin ZHAO ,  Zhiqiang LIANG ,  Longlong TENG ,  Wenhua SHEN

IPC: B21B45/02

CPC classification number: B21B45/0248 ,  B21B45/0209

Abstract: An internal-cooling rolling tool capable of realizing variable-angle low-temperature lubrication is provided. The internal-cooling rolling tool includes a tool handle, a rotatable tool head and a medium conveying tube. The rotatable tool head includes a base, a rolling head and a ball. The bottom end of the base is mounted on the tool handle, and the top of the base is provided with a medium input port connected with the medium conveying tube. The rolling head is detachably mounted on the front end surface of the base, and the front end surface of base is provided with a plurality of spray holes in the circumferential direction of the rolling head. The medium conveying tube communicates with the spray holes through a medium flow channel. The ball is mounted on one end of the rolling head facing away from the base.

公开(公告)号：US20220074836A1

公开(公告)日：2022-03-10

申请号：US17397528

申请日：2021-08-09

Applicant: Beijing Institute of Technology

Inventor： Li JIAO ,  Huiqing GU ,  Xibin WANG ,  Pei YAN ,  Shiqi CHEN ,  Binxing MA ,  Jiabin LIANG

IPC: G01N3/06 ,  G01B11/24

Abstract: The present disclosure relates to a method for determining initiation positions of fretting fatigue cracks. The processed inner circular hole test workpiece is placed on a stage of an optical microscope, wherein the inner hole surface to be measured is perpendicular to the scanning beam direction of the microscope; measurement is performed along the real contact orientation between the inner hole surface of the inner circular hole test workpiece and the pin shaft. From the measured surface morphology and profile image, rectangular target areas with a coverage rate of 75%˜90%, and the amplitude distribution function, surface skewness and surface kurtosis values of the respective surface profiles are extracted from the target areas. By comparing the positive/negative of and the magnitude of the skewness and kurtosis values measured in the target areas, the side where the initiation position of fretting fatigue cracks is located can be determined.