IMPROVEMENT OF DETAILS CONNECTION ASSEMBLY TECHNOLOGY WITH INTERFERENCE

2016 ◽  
Vol 1 (2) ◽  
pp. 30-34
Author(s):  
Коновалов ◽  
Vladimir Konovalov ◽  
Симанин ◽  
Nikolay Simanin ◽  
Петрова ◽  
...  
Keyword(s):  
Fluid Pressure ◽  
Hydraulic Cylinder ◽  
Machine Building ◽  
Technical Solution ◽  
Mechanical Assembly ◽  
Interference Fit ◽  
Press Fit ◽  
Axial Forces ◽  
The Press ◽  
Assembly Technology

The purpose of the study is to increase the strength of the collected compounds and to expand the technological accuracy of the method of Assembly with an interference fit. Fixed press-fit connection with interference are widely used in machine building, when the transfer of substantial axial forces are required, torques or combined loads from their joint action. Resistance to mutual misalignment of the parts in these compounds is created and supported by the forces of elastic deformation on the mating surface of the covered part (shaft) and stretching on the mating surfaces of the covering parts (holes) is proportional to the magnitude of the preload in the connection. In such compounds, the diameter of the shaft before Assembly is always larger than the diameter of the hole. In the article the analysis of the known different ways of joining parts with interference fit, including hydraulic presses. The second problem is solved due to the fact that the connection details with tightness is carried out by pressing the press stroke from one detail to another, and the breakdown of the compounds obtained by the relative longitudinal movement of parts, in which the breakdown is carried out periodically in the process of pushing through the transfer of force from the press stroke to pressed items to the elastic connection. The force on the press stroke is created by a hydraulic cylinder with large displacement, a resilient connection between the slider and pressed item performs in the cylinder, the fluid pressure and volume which can be adjusted by changing the stiffness and capacity of the drive RAM, as well as the magnitude of its longitudinal movement during the disruption. The scheme of Assembly of the connection de-hoist with tension. Original technical solution for press fit connection parts extends the technological possibilities of the equipment, increases the strength of the collected compounds and can be used in machine building, particularly in mechanical Assembly processes and, in particular, in the repair and production of agricultural machinery.

scholarly journals Analysis of Interference-Fit Joints

2021 ◽  
Vol 11 (23) ◽  
pp. 11428
Author(s):  
Jerzy Madej ◽  
Mateusz Śliwka
Keyword(s):  
Bearing Capacity ◽  
Load Capacity ◽  
Fem Simulation ◽  
Load Bearing Capacity ◽  
Measuring Device ◽  
Plastic Deformations ◽  
Interference Fit ◽  
Load Bearing ◽  
Press Fit ◽  
The Press

Interference fit joints have been widely used in many engineering constructions, in particular in electric motors. It is of particular importance to calculate the load capacity of press-fit joints, especially in the overload ranges of construction to estimate the safety factor. The article presents a FEM numerical simulation of pressing the shaft into the hub, taking into account various types of fits. The results of numerical simulations presented in the article were positively verified with the MTS measuring device, which confirmed the correctness of the numerical model. So far, the load-bearing capacity of press-fit joints has been calculated from Lame’s formulas. The results of the load capacity of the joints obtained by the FEM simulation were compared with the results obtained from Lame’s formula. The comparison shows that when designing interference fit joints, attention should be paid to the fact that the press-in process, depending on the type of fit, may be elastic-plastic. Plastic deformations in the contact zone of the joint affect its load-bearing capacity. Therefore, the design of press-fit joints should not be based on Lame’s formulas, which do not take into account the range of plastic work of the material.

Comparison of numerical and ultrasonic techniques for quantifying interference fit pressures

2008 ◽  
Vol 222 (7) ◽  
pp. 1125-1130 ◽  
Author(s):  
R Lewis ◽  
A Yoxall ◽  
M B Marshall
Keyword(s):  
Fatigue Crack Initiation ◽  
Analytical Techniques ◽  
Design Tool ◽  
Interference Fit ◽  
Press Fit ◽  
The Press ◽  
Ultrasonic Techniques ◽  
Rotating Bending ◽  
Railway Wheels ◽  
Bending Loading

Press fits are commonly used in manufactured assemblies, components, and machines. For example railway wheels are press or shrink fitted onto axles. Railway axles occasionally fail by fatigue resulting from the alternating rotating bending loading. The site of the fatigue crack initiation is commonly at the location of the press fit. Therefore, a good understanding is needed of the press-fit region, particularly where stress-raising effects are caused by, for example, large changes in geometry. Analytical techniques are unable to predict stresses in these areas. In this work, an ultrasonic technique was used to measure the contact stresses in a real shaft—sleeve contact. The results were compared with finite-element models of the same components. The results from the two techniques compared well both in the centre of the fit and around the edges where the stresses were raised. Both showed good correlation with the analytical Lamé solution away from the edges. The two techniques could therefore be combined in a design tool to help remove problems with edge effects that could lead to mechanical failures.

Computer Simulation of the Press Fit Connection

2021 ◽  
pp. 3-11
Author(s):  
M.A. Lyubchenko ◽  
Martinez Juan Marcos Garcia ◽  
Quintana Laura Angelica Samora ◽  
V.S. Syromyatnikov
Keyword(s):  
Computer Simulation ◽  
Statistical Analysis ◽  
Reference Data ◽  
Statistical Significance ◽  
Modern Technology ◽  
Time Saving ◽  
Press Fit ◽  
The Press ◽  
Assembly Technology ◽  
Computing Speed

The design of modern technology is associated with increased requirements for strength and manufacturability. Press fit connections of small size parts can withstand significant workloads, so they are widely used in mechanisms and machines. Traditionally, the calculation of press fit connections is performed according to classical formulas using a large amount of reference data. The calculations use standard recommendations that make it easier to obtain solutions with a minimum investment of time. However, the time saving limits the search to a few joints, which are not always the best in some indicators. Modeling press fit joints with different combinations of parameters leads to the formation of hundreds of potential joints. To check their performance, it is necessary to use modern computing facilities. The computer has almost unlimited possibilities for computing speed and storing arrays of information. Simulation of press fit connections on a computer allows obtaining regression metamodels, accessing the statistical significance of parameters, and determining the area of workable connections. It becomes possible to optimize the design of the joint in terms of strength, weight and assembly technology. The system for calculating and statistical analysis of press fit connections has been developed on the basis of existing standards. A program has been developed providing the joints formation and verification with an assessment of their suitability for the specified requirements.

Experimental Investigation of Fretting Fatigue of Train Axles under Rotating Bending

2011 ◽  
Vol 291-294 ◽  
pp. 1110-1115 ◽  
Author(s):  
Wen Jing Wang ◽  
Meng Wang ◽  
Guang Xue Yang ◽  
Ji Long Xie
Keyword(s):  
Fretting Fatigue ◽  
Test Results ◽  
Railway Transportation ◽  
Interference Fit ◽  
Press Fit ◽  
The Press ◽  
Bending Loads ◽  
Rotating Bending ◽  
Fretting Damage ◽  
Damage Rule

In railway transportation, the press fit of wheel and axle is typically causing fretting damage and it is also an important issue relative to the safety of railway. To examine the fretting damage of the interference fit of wheel and axle the fretting fatigue test under 4-point rotating bending loads is carried out based on samples, as well as the fretting fatigue damage rule is studied. The test results show that the fretting causes the fatigue limit to decrease significantly and all of the fracture sections occur at the contact edges of the fitting zone with the sleeve.

Auszugverhalten von Schaftfräsern*/Pull-out behavior of end mills – Experimental study on different clamping devices with various clamping mechanisms

2018 ◽  
Vol 108 (05) ◽  
pp. 353-358
Author(s):  
E. Abele ◽  
F. Ali ◽  
M. Berger
Keyword(s):  
Experimental Study ◽  
Test Bench ◽  
Mechanical Load ◽  
Mechanisms Of Action ◽  
Heavy Duty ◽  
Press Fit ◽  
Pull Out ◽  
The Press ◽  
End Mills ◽  
Tool Position

Aus Schwerzerspanung und Turbinenschaufelfertigung ist bekannt, dass Werkzeuge aus dem Spannfutter ausgezogen werden. Die veränderte Werkzeugposition führt zur Abweichung von den vorgegebenen Toleranzen und einer geringeren Fertigungsqualität oder Beschädigung des Werkstücks. Der Artikel untersucht das Auszugsverhalten verschiedener Spannfutter. Mit einem Prüfstand können die Einflüsse der mechanischen Belastung und der Klemmlänge auf die Haltekraft im Pressverband betrachtet und die Wirkmechanismen beim Auszug des Werkzeuges aus dem Spannfutter sensorisch ermittelt werden.   From heavy-duty cutting and turbine blade manufacturing it is known that tools pull out from chucks. A change in tool position leads to deviations from tolerance and decreases manufacturing quality or damages the workpiece. This article explores the extension behavior of different chucks on a specifically designed test bench. This allows determining how mechanical load and clamping length influence the holding force in the press fit and what mechanisms of action affect the extraction of the tool from the chuck.

Design and Manufacturing of Cylinder-Beam Integrated Hydraulic Press

2013 ◽  
Vol 397-400 ◽  
pp. 157-161
Author(s):  
Wei Wei Zhang ◽  
Xiao Song Wang ◽  
Shi Jian Yuan ◽  
Zhong Ren Wang
Keyword(s):  
Driving Force ◽  
Geometric Dimension ◽  
Hydraulic Cylinder ◽  
Hydraulic Press ◽  
Force Distribution ◽  
Section Modulus ◽  
The Press ◽  
The World ◽  
Design And Manufacturing ◽  
Institute Of Technology

For a cylinder-beam integrated hydraulic press (CBIHP), the hydraulic cylinder is also functioned as an upper beam. It is the key structural component that outputs the driving force to forge parts. Compared with the traditional three-beam and four-column hydraulic press which has a cylindrical hydraulic cylinder, the structure and force distribution are significantly different for CBIHP. It is able to have higher nominal force and larger section of plunger which the pressure is applied on when the contour geometric dimension is the same. Also, CBIHP has lighter weight and larger section modulus when the nominal force is the same than the traditional hydraulic press. Finally, a 6300KN cylinder-beam integrated hydraulic press, which is the first CBIHP in the world and designed by Harbin Institute of Technology (HIT) in 2012, is also introduced in this paper. It can be seen from the results of numerical simulation for the CBIHP that both of the stresses and displacements on the press in the loading process are allowable.

14-Year Median Follow-Up Using the Press-Fit Condylar Sigma Design for Total Knee Arthroplasty

2013 ◽  
Vol 28 (8) ◽  
pp. 1286-1290 ◽  
Author(s):  
Shantanu S. Patil ◽  
George Branovacki ◽  
Mersadies R. Martin ◽  
Pamela A. Pulido ◽  
Yadin D. Levy ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Press Fit ◽  
The Press ◽  
Total Knee

Interference Fit Design Assessment and Improvement for the Railway Wagon Wheelset with 30 Ton Axle Weigh

2013 ◽  
Vol 658 ◽  
pp. 318-322
Author(s):  
A.S. Xue ◽  
Y.X. Zhao ◽  
B. Yang
Keyword(s):  
Hole Diameter ◽  
Original Design ◽  
Design Assessment ◽  
Interference Fit ◽  
Railway Wagon ◽  
The Press ◽  
Reasonable Range ◽  
Calculation Results ◽  
Stress States ◽  
Relationship Of

Design reliability is analyzed for the interference fits of the railway wagon wheelset with 30 ton axle weigh. Aim focus on eliminating fretting fatigue damage of the wheelset. An extreme wheelset loads set is deduced by which can yields the thermal mechanical loads on the wheel same to the code AAR S 660. Integrated wheelset model of finite element method is applied to calculate the stresses on the fits to consider the physical fit relationship of wheelset, in which the rail pieces, wheels, axle, bearings, and adapters are fitted together by contact phases. It is revealed that the fits are all in the press stress states for the original design. But the stresses seem smaller than the least reasonable value for the reliable fits between wheels-axle. An improvement suggestion is provided to rise the fit scale to 0.23 mm equal to 0.01 percentage of the wheel-hub hole diameter. Calculation results verify that the press stresses have been controlled in the reasonable range.

Rationale of the Press-Fit Cup

1995 ◽  
pp. 190-199
Author(s):  
E. Morscher
Keyword(s):  
Press Fit ◽  
The Press
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