Application of the criterion for total wear of the surface layer of gear teeth in determining helical gear geometric parameters

2020 ◽  
pp. 20-27
Author(s):  
A.G. Popovich
Keyword(s):  
Surface Layer ◽  
Layer Thickness ◽  
Helical Gear ◽  
Operating Period ◽  
Wear Process ◽  
Wear Rates ◽  
Gear Teeth ◽  
Total Wear ◽  
Gear Wheels

Formulas for determination of worn-out layer thickness sum on the mating rapidly wearing areas of teeth active surfaces of driving and driven helical gear wheels are deduced on the basis of involute gearing theory considering the laws of wear process. An equation of the linkage between such values of basic rack shift coefficients for the helical gear wheels which minimize the greater sum of wear rates on these areas is derived. Solution of this equation by numerical method for the helical gear having standard distance between axes allows determining these values of shift coefficients with which operating period of this gear until achievement of the permissible worn-out layer thickness sum on the mentioned areas will be maximal. Keywords: involute helical gear, displacement coefficient, producing rail, specific slip, contact stress, wear thickness. [email protected]

Determination of the effective path of contact of undercut involute gear teeth

2004 ◽  
Vol 218 (7) ◽  
pp. 751-760 ◽  
Author(s):  
J I Pedrero ◽  
M Artés ◽  
C García-Masiá
Keyword(s):  
Accurate Determination ◽  
Approximate Equation ◽  
Helical Gear ◽  
Computer Applications ◽  
Contact Ratio ◽  
Gear Teeth ◽  
Involute Gear ◽  
Stress Levels ◽  
Effective Path

An approximate equation for accurate determination of the inner point of the involute profile of undercut spur and helical gear teeth is presented. This point may have influence on the effective path of contact and consequently on the contact ratio, the length of the path of contact and the stress levels, which should be taken into account for calculation and standardization purposes. Since the equation is valid for any tool proportions, it is very efficient for computer applications.

Determination of nonradiative surface layer thickness in quantum dots etched from single quantum well GaAs/AlGaAs

1989 ◽  
Vol 55 (14) ◽  
pp. 1427-1429 ◽  
Author(s):  
E. M. Clausen ◽  
H. G. Craighead ◽  
J. M. Worlock ◽  
J. P. Harbison ◽  
L. M. Schiavone ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Layer ◽  
Quantum Well ◽  
Layer Thickness ◽  
Single Quantum ◽  
Single Quantum Well ◽  
Surface Layer Thickness

Approximate Method for the Determination of the Bending Strength Geometry Factor for External Spur and Helical Gear Teeth

1999 ◽  
Vol 122 (3) ◽  
pp. 331-336 ◽  
Author(s):  
J. I. Pedrero ◽  
A. Fuentes ◽  
M. Estrems
Keyword(s):  
Bending Strength ◽  
Helical Gear ◽  
Critical Section ◽  
Approximate Determination ◽  
Tool Geometry ◽  
Geometry Factor ◽  
Gear Teeth ◽  
Iterative Procedures ◽  
Center Distance

The methods currently available for the determination of the AGMA J-factor require iterative procedures in order to compute the value of the critical section parameter, which is necessary to compute the tooth thickness at the critical section and the height of the Lewis parabola. This paper presents an approximate, non-iterative method for the determination of the AGMA J-factor for involute, external gear teeth, which is based on the approximate determination of the critical section. The method is valid for any tool geometry, including rack-type or pinion-type generation, and considers tool offsets, center distance modifications and backlash. [S1050-0472(00)00903-X]

Determination of Steady-State Adhesive Wear Rate

2005 ◽  
Author(s):  
L. J. Yang
Keyword(s):  
Steady State ◽  
Wear Rate ◽  
Wear Test ◽  
Standard Test ◽  
Test Method ◽  
Testing Time ◽  
Wear Coefficient ◽  
Wear Rates ◽  
Test Methodology

Wear rates obtained from different investigators could vary significantly due to lack of a standard test method. A test methodology is therefore proposed in this paper to enable the steady-state wear rate to be determined more accurately, consistently, and efficiently. The wear test will be divided into four stages: (i) to conduct the transient wear test; (ii) to predict the steady-state wear coefficient with the required sliding distance based on the transient wear data by using Yang’s second wear coefficient equation; (iii) to conduct confirmation runs to obtain the measured steady-state wear coefficient value; and (iv) to convert the steady-state wear coefficient value into a steady-state wear rate. The proposed methodology is supported by wear data obtained previously on aluminium based matrix composite materials. It is capable of giving more accurate steady-state wear coefficient and wear rate values, as well as saving a lot of testing time and labour, by reducing the number of trial runs required to achieve the steady-state wear condition.

Application of 3D-printing technologies for production of master-model in engineering industry

2021 ◽  
Vol 0 (9) ◽  
pp. 17-21
Author(s):  
O. A. Dvoryankin ◽  
◽  
N. I. Baurova ◽  
Keyword(s):  
3D Printing ◽  
Layer Thickness ◽  
Ultimate Strength ◽  
3D Models ◽  
Engineering Industry ◽  
Master Model ◽  
Parameter Influence ◽  
Printing Parameter

Analysis of 3D-printing methods used in the molding production to manufacture master-models has been carried out. The technology was selected, which allowed one to make high-precision parts, combining the molding and the 3D-printing. Factors effecting on the quality of 3D-models printed by this technology were analyzed. Experimental studied for determination of the printing parameter influence (layer thickness, filling percentage, printing velocity) on ultimate strength of specimens made of ABS-plastic were carried out.

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