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The Flower Preparatory School Festival: Lessons Hidden in the Songs Unraveled by the Folk Song Club
[Reproduction of Private Spring Preparatory School Lecture 46] Introducing songs about mainsprings, songs that encourage quality control, and songs related to painting and spring surfaces!
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A comprehensive summary of the causes of wire spring damage and preventive measures.
[Reproduction of Private Spring Preparatory School Lecture 45] The usable temperatures of various steel wires and JIS related to wire springs are also included in the table!
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Principles, Effects, and Practical Methods of Shot Peening and Setting
[Reproduction of Private Spring Preparatory School Lecture 44] Shot peening is a surface treatment! Explanation of the final process setting as well.
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Improvement of fatigue resistance of springs by shot peening and precautions during processing.
[Reproduction of Private Spring Preparatory School Lecture 43] Fine matte texture on airplane parts! Explanation of shot peening.
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Quality degradation due to grinding of the spring end face and heat generation, and points to note.
[Reproduction of Private Spring Preparatory School Lecture 42] Thin wire springs, thick wire springs! An explanation of the issues of end face grinding and shot peening for both.
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The difference between coloring steel wire through low-temperature annealing and bluing, and their purposes.
[Reproduction of Private Spring Preparatory School Lecture 41] Low-temperature annealing is commonly referred to as bluing! The blue color is the color of the iron oxide film formed on the surface of the steel.
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What is a method to dramatically improve the efficiency of wire insert insertion work?
[NAS Standards: NAS1130, NASM8846] Accurate Tangless Insert *A must-see for everyone using tang inserts!
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The purpose and effects of low-temperature annealing of wire springs, and the importance of the manufacturing process.
[Reproduction of Private Spring Preparatory School Lecture 40] Explanation of the changes in mechanical properties due to low-temperature annealing of piano wire and oil-tempered wire!
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Quality and tensile strength of spring steel wire and changes in coil diameter.
[Reproduction of Private Spring Preparatory School Lecture 39] An explanation of how the tensile strength of spring steel wire significantly affects coiling!
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The relationship between the quality and surface defects of spring steel wire and its price.
[Reproduction Private Spring Preparatory School Lecture 38] Make sure to check that there are differences in price depending on the type of line and the line diameter!
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Characteristics of the manufacturing process and heat treatment of spring steel wire, and the importance of quality control.
[Reproduction of Private Spring Preparatory School Lecture 37] Introduction to unique heat treatments such as patenting, acid pickling, wire drawing, and oil tempering!
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Differences in types of spring steel wire and manufacturing processes.
[Reprint Private Spring Preparatory School Lecture 36] An explanation of the differences between the brothers of spring steel wire and their growth processes!
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Detailed explanation of types of steel wire and JIS standards.
[Reproduction of Private Spring Preparatory School Lecture 35] Introduction to the JIS numbers, symbols, and chemical components (only carbon and manganese content) of three types of wire materials!
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Introduction to types of spring steel wire, their applications, and the production process.
[Reproduction of Private Spring Preparatory School Lecture 34] Introduction to soft steel wire, hard steel wire, piano wire, and welding rod core wire!
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Causes of defects due to heat treatment and preventive measures: countermeasures for overheating, quenching, and cracking.
[Reprint Private Spring Preparatory School Lecture 33] What you need to be careful about is overheating! An introduction to defects that are likely to occur during heat treatment.
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Detailed explanation of dimensional changes due to quenching and tempering, and heat treatment techniques.
[Reproduction of Private Spring Preparatory School Lecture 32] Explanation of the relationship between temperature and elongation when heated slowly and cooled slowly!
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The relationship between the microstructural changes of steel due to annealing and hardness.
[Reproduction of Private Spring Preparatory School Lecture 31] Explaining how tempered martensite changes through tempering!
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The relationship between ski downhill courses and the cooling rate of steel quenching.
[Reproduction of Private Spring Preparatory School Lecture 30] Explaining what happens when the cooling speed from high temperatures is changed!
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Explanation of the temperature changes due to the steel transformation process and the influence of carbon.
[Reproduction of Private Spring Preparatory School Lecture 29] Pure iron at room temperature undergoes a sudden transformation into gamma iron when the temperature rises to 910 degrees!
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The importance of changes in steel transformation and organizational structure, and hardness adjustment through heat treatment.
[Reproduction Private Spring Preparatory School Lecture 28] We are explaining using a diagram that shows the carbon content and the proportion of organizational components in steel!
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The relationship between yield point, tensile strength, strength, and hardness in steel tensile testing.
[Reprint Private Spring Preparatory School Lecture 27] Explanation of the load and elongation diagram in the tensile test of steel!
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Difference between premium liquor and hard steel: Changes in properties brought about by alcohol content and carbon amount.
[Reproduction Private Spring Preparatory School Lecture 26] As the amount of carbon increases, both tensile strength and yield point increase!
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History of spring materials and types of steel: Changes in properties and applications based on carbon content.
[Reproduction of Private Spring Preparatory School Lecture 25] The relationship between the transition of cultures such as stone tools, bronze tools, and iron tools and spring materials!
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The effects and precautions of shot peening in improving the fatigue strength of spring materials.
[Reproduction of Private Spring Preparatory School Lecture 24] An explanation of the miracle cure for improving fatigue resistance, shot peening, and other important considerations!
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The importance of corrosion treatment and surface strengthening to enhance the durability of springs.
[Reproduction of Private Spring Preparatory School Lecture 23] Explanation of methods to prevent the decline of fatigue strength and surface treatments aimed at corrosion protection!
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The mechanism of metal rust formation and its effect on fatigue strength.
[Reproduction of Private Spring Preparatory School Lecture 22] Explanation of the relationship between oxides that form on metal surfaces, namely rust, and fatigue strength!
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Changes in the fatigue strength of springs due to dimensional effects and the influence of internal defects in the material.
[Reproduction of Private Spring Preparatory School Lecture 21] Yielding and fatigue destruction are related not only to the maximum surface stress but also to the stress at a certain depth from the surface!
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The impact of surface roughness of steel materials on spring performance and the importance of improving surface quality.
[Reproduction Private Spring Preparatory School Lecture 20] Not only does fatigue strength decrease, but the thickness of the material and wire diameter also decrease: Gama skin, shark skin, and Zenitamus!
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The importance of factors affecting fatigue strength, such as notches and surface roughness, and their countermeasures.
[Reproduction of Private Spring Preparatory School Lecture 19] Notches reduce both static strength and fatigue strength! The scary part is the notches that are like bacteria, which are hard to see.
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The Story of Butsushutarou and the Estimation Method of Fatigue Limits Learned from Static Strength and Its Practice
[Reproduction of Private Spring Preparatory School Lecture 18] Study of Fatigue Limit Estimation Method! Estimating fatigue limits from tensile strength and hardness test results.
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