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The validity of this method was validated through analyzing the tooth surface accuracy error of the model which was below 1µm between the virtual tooth surface and the theoretical tooth surface and the possible factors affected the tooth surface accuracy during manufacturing was also carried on the discussion.
Introduction With the development of modern industrial technology of gears, the high accuracy gear model becomes urgent need to study the mechanical properties of the gears.
Taking CATIA V5 as the modeling platform, using the macro function, through simulating the reality gear hobbing method, the whole gear hobbing simulation technology of involute helical gear was achieved, a model of high-precision gear was obtained, and the factors that may affect the accuracy of tooth surface during processing gear was also discussed.
To set up experiments to determine the influence trend of factors based on the assumed factors: hob feed speed (amount of feed after each loop) (mm/r) and interval angle of gear blank rotation (°).
[2] Li Liao: Mechanical Engineer.

The Mechanical Properties of Concrete Incorporating Steel Slag as Supplementary Cementitious Material LI Xiaofeng1,a, DOH Shu Ing1,b*, FENG Weiying2,c, ALBTOOSH Ja’far A.
This study aims to evaluate the effectiveness of SS as supplementary cementitious material (SCM) partially replacing cement on workability and mechanical properties of fresh and hardened concrete.
Kumar et al. [5] studied the effect of SS powder on the mechanical properties of self-compacting concrete with recycled coarse aggregate.
The factors which affect the strength of the concrete may affect the UPV of the concretes where the concrete is controlled by the strength of the cement paste and the UPV is controlled by the properties of the aggregates used [26].
Rubio-Cintas, Slag substitution as a cementing material in concrete: Mechanical, physical and environmental properties, Materials. 12 (2019) 2845

Alkalis also affect other properties of concrete such as basic physical-mechanical properties, frost resistance and pH.
At properties such as air content and spacing factors, even slightly better values were achieved for mixtures with higher alkali content, mainly with the use of an aerating agent.
The detailed composition and properties of feedstock are given in [6] and properties of aggregate are given in [7].
Smanoui, M.A.Be´rube´,B.Fournier, B.Bissonnette, B.Durand, Effects of alkali addition on the mechanical properties and durability of concrete (2005) [4] W.Chen, H.J.H.
Pešata Determination of basic physical-mechanical properties of slag aggregate, Ostrava (2016)

PP has a semi-crystalline structure which can affect the properties such as mechanical behavior, thermal properties, and chemical resistance [3], [4].
With the high crystallinity of the sorghum fiber, the mechanical properties of the added PP are expected to enhance the mechanical properties of the PP material.
Mechanical Properties.
Increased crystallization of the modified fiber is expected to increase the stiffness and strength of the PP and MFC mixture, implying that its mechanical properties will improve.
Luna, “Nutritional and Functional Properties of Sorghum (Sorghum bicolor (L.)

Introduction Seeker, involved in the final guidance of missile, is the key factor affecting guidance accuracy.
As one type of aviation parts, seeker’s mass should be controlled and its mechanical properties must also meet the design requirements, stiffness, strength, et al, so as to bear the complicated tough application environment conditions.
To optimize the design of the framework for an infrared seeker, the basic requirement is that mechanical properties should be guaranteed and improved without an incremental in mass or weight.
Fig. 2 The initial design for inner and external framework structures To verify the mechanical properties of the primary design of the chosen structure, FEM analysis was carried out.
Fig. 6 FEM analysis results of the optimized design for inner framework Fig. 7 FEM analysis results of the optimized design for external framework After optimization, the mechanical properties of the frameworks had been improved.

It results on the improvement of the handling and mechanical properties of set AC.
When the index of handling property was plotted to mechanical strength, at the same handling index the mechanical strength of hydrophilicity improvement after O3 treatment was higher than untreated powder [14].
Many factors govern the cell response such as composition and surface morphology [17-21].
Less water needed for handling property results in improvement of mechanical property of set AC.
This result might provide new insights into the development of a new method to acquire improvement of handling property of AC with a biocompatible method that would affect the high mechanical properties and cell behavior of the AC without sacrificing the biocompatibility of AC.

During the production of domestic automobile vent pipe, because the crystal grains of welding Joint heat-affected zone are not refined by heat treatment and become very big, forming properties of cold machining of ferrite stainless steel become bad.
At the same time, the affecting factors are considered, such as thermal radiation, phase change latent heat, thermophysical properties of materials with temperature changes and the spread of convective heat in the liquid metal in the model.
The research results has important meaning to know accurately laser welding thermal process, welding stress , distortion predictive control, the structure property analysis and the automobile exhaust pipe cold forming quality[4].
(3) The dynamic temperature field establishment of 409L ferritic stainless steel laser welding pipe laid the foundation for forecasting mechanical properties of welded joint and stress-strain field.

Through combination of experimental investigation with theoretical optimum design, this paper determined the crucial factors in affecting the heat transfer capacity in micro heat pipes with a trapezium-grooved wick structure are capillary limit and entrainment limit, and verified the validity of the heat transfer models thus built.
According to the physico-mechanical properties of copper pipe, multi-tooth tools and the method of high-speed spin filled with full liquid are adopted to cause the surface layer metal of copper-based pipe's inner wall to produce continuous plastic deformation, and specially shaped groove structures are thus formed, i.e., different machining parameters can be set to machine sections of different shapes and micro grooves with different tooth shapes.
The second advantage is that the mechanical and physical properties of the machined finned tube would be strengthened.
Based on heat transfer theory, through optimization of the heat transfer limits, this study determines capillary and entrainment limits as the crucial factors in affecting the heat transfer capacity in micro heat pipes with a trapezium-grooved wick structure
[12] Li Xi-bing, Li Yong: China Mechanical Engineering, Vol.15, No.15 (2008), p.1847-1852

The models of QTF were introduced in two types: a mechanical model and an electrical model.
Quartz Tuning Fork (QTF) The basic principle of the tuning fork [6-9] is well known to musicians: two prongs connected at one end make a resonator whose resonance frequency is defined by the properties of the material from which it is made and by its geometry.
The unique property of quartz resonators is such a huge equivalent inductance in a tiny volume [13].
The mechanical and electrical models of a tuning fork oscillator [12].
The Q factor adjusting of the QTF strongly affects to phase of output signal.

Due to the continuing renovation of the modern technology and the demand for the better consumer products, electricity has become one of the important factors that affect people’s life.
Good electrical contact material should have good electrical conductivity, good thermal conductivity, high boiling temperature, good corrosive resistivity, good impact sustainability and good fabrication properties [2,3].
Figure 5 shows factors vs.
Fig. 5 Factors vs.
Taguchi method was used to improved the performance of electrical switch and obtain the factors that affect the quality to produce the better performance product.