Metrologic theory for threaded joint tightening devices

S. I. Zhbyr'; L. G. Palei

doi:10.1007/bf00978974

Analysis of error influence in tooth direction upon combined cog-wheels accuracy

Science intensive technologies in mechanical engineering ◽

10.12737/20135 ◽

2016 ◽

Vol 1 (6) ◽

pp. 17-21

Author(s):

Александр Черепахин ◽

Aleksandr Cherepakhin ◽

Алексей Хоров ◽

Aleksey Khorov

Keyword(s):

Ring Gear ◽

Threaded Joint ◽

Kinematic Accuracy ◽

Joint Tightening ◽

Analysis Of Error

The solution of a problem in multi-range of cylindrical cog-wheels is in the use of banded wheels. One of the significant problems of banded wheels consists in decrease of their accuracy at assemblage. In the paper there is considered the influence of torque oscillation at threaded joint tightening upon a bend of a ring gear, and finally upon its accuracy. In the paper it is shown that the application of mechanized (pneumatic) nut-runners results in: an increase of kinematic accuracy values and smoothness of operation of an assembled cog-wheel and lose of a ring gear not less than for one degree. In the paper the attention is drawn of manufacturers to the necessity of the application of more accurate automated nut-runners and to the certification of a ring gear not only after processing, but also after assembling.

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Application of Frequency Method for Defining Threaded Joint Tightening Degree

Solid State Phenomena - Mechatronic Systems and Materials ◽

10.4028/3-908451-21-3.277 ◽

2006 ◽

pp. 277-280

Author(s):

V.K. Augustaitis ◽

V. Bučinskas ◽

V. Pauža

Keyword(s):

Frequency Method ◽

Threaded Joint ◽

Joint Tightening

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Application of Frequency Method for Defining Threaded Joint Tightening Degree

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.113.277 ◽

2006 ◽

Vol 113 ◽

pp. 277-280

Author(s):

Vytautas Kazimieras Augustaitis ◽

Vytautas Bučinskas ◽

V. Pauža

Keyword(s):

Transient Process ◽

Internal Combustion Engines ◽

Dynamic Properties ◽

Contact Stiffness ◽

Frequency Method ◽

Threaded Joint ◽

Resonance Frequencies ◽

Threaded Joints ◽

Joint Tightening ◽

Computer Card

There is a big variety of machines and equipment – internal combustion engines, aviation parts, building frames - joined by threaded joints, realized as bolt, nut and pin ones. For successful and safe exploitation of such equipment, it is required to check the tightening degree of threaded joints. There are few known methods of such control and one is presented in this paper. The proposed method is based on contact stiffness and friction change from thread tightening degree. At the same time, tightening changes with sufficient significance the dynamical properties of such a system - natural and resonance frequencies, amplitude – frequency and amplitude-phase characteristics, so, that it is possible to evaluate the tightening degree of the investigated joint. Dynamic properties are defined by exciting transient process between bolt head and tightened by this bolt detail using as short as possible force impact. Sensors register analogical signal of transient process and transmit it to a special computer card. The computer card converts analogical signal to code. Code is saved in the computer file for further processing. Processing data is saved in this file, and we find desired dynamical characteristics. Using special experimental bench proved that dynamic characteristics are sensitive enough to threaded joint tightening degree and the method is applicable to practice.

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Rotator cuff tear with joint stiffness: a review of current treatment and rehabilitation

Clinics in Shoulder and Elbow ◽

10.5397/cise.2020.00143 ◽

2020 ◽

Vol 23 (2) ◽

pp. 109-117

Author(s):

Hyung-Seok Park ◽

Kyung-Ho Choi ◽

Hyo-Jin Lee ◽

Yang-Soo Kim

Keyword(s):

Rotator Cuff ◽

Rotator Cuff Tear ◽

Joint Stiffness ◽

Current Treatment ◽

Cuff Tear ◽

Paradoxical Phenomenon ◽

Joint Tightening

Repair of the rotator cuff tear is a joint-tightening procedure that can worsen joint stiffness. This paradoxical phenomenon complicates treatment of rotator cuff tear with joint stiffness. As a result, there is controversy about how and when to treat joint stiffness. As many treatments have been published, this review discusses the latest findings on treatment of rotator cuff tear with joint stiffness.

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