(2) Excellent polishability. Cemented carbide has good polishing properties, and the working surface can be polished into a mirror surface to ensure the high quality of the surface of the standard parts.

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The rapid deformation and internal friction of the metal may increase the temperature of the workpiece to more than 200 ° C. The cold heading die should be able to work at this temperature for a long time without changing the hardness, and it can be continuously forged and extruded. It can still have good fatigue resistance despite the alternating stress of cold and heat.

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a.Improve the die strength. According to relevant information, the strength of the two-layer composite die is 1.3 times that of the overall die, and the three-layer composite die is 1.8 times the strength of the overall die (for a certain size of die).

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(1) High wear resistance. Cemented carbide die material has high wear resistance, which can ensure that the die can work for a long time under any degree of deformation, and ensure that the size of the standard parts remains unchanged.

In order to improve the life of cold heading die, different measures can be adopted. Such as improving the lubrication conditions, designing a reasonable shape of the cold heading die, reducing the roughness value, etc., to improve the processing quality of the cold heading die. The use of prestressed combined die is very effective to improve the life of the die.

d.When the die is damaged, only the inner ring needs to be replaced, and the prestressed ring can still be used without the need to scrap the entire die.

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(3) Small adhesion to metal. During the cold heading process, the ferrous metal material has little adhesion to the cemented carbide die material, which ensures a high service life of the cemented carbide cold heading die.

"Turn on, tune in, drop out" is a counterculture-era phrase popularized by Timothy Leary in 1966. In 1967, Leary spoke at the Human Be-In, a gathering of 30,000 hippies in Golden Gate Park in San Francisco and phrased the famous words, "Turn on, tune in, drop out". It was also the title of his spoken word album recorded in 1966. On this lengthy album, Leary can be heard speaking in a monotone soft voice on his views about the world and humanity, describing nature, Indian symbols, "the meaning of inner life", the LSD experience, peace, and many other issues.

Like every great religion, we seek to find the divinity within and to express this revelation in a life of glorification and the worship of God. These ancient goals we define in the metaphor of the present—turn on, tune in, drop out.[3]

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The use of prestressed combined die also has certain disadvantages: such as increased processing surface, high processing technology requirements.

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In 1967, Leary (during the salon known as the Houseboat Summit) announced his agreement with a new ordering of the phrase as he said, "I would agree to change the slogan to 'Drop out. Turn on. Drop in.'"[5]

(5) High thermal conductivity. Due to the high thermal conductivity of the cemented carbide die material, the heat generated during the cold heading process can be quickly conducted away, which improves the durability of the die.

b.Save die steel. The original overall die is all made of die steel Manufacturing, now the inner ring size is reduced, the outer ring can be made of alloy steel or medium carbon steel.

Cemented carbide is composed of medium and coarse grained rare refractory carbides (tungsten carbide or titanium carbide) and metal cobalt as a binder, and is used as a mold cemented carbide, among which rare refractory carbides are generally carbonized. Tungsten. Due to the powder metallurgy method, this alloy still maintains the original characteristics of tungsten carbide, its hardness is close to that of diamond, and at the same time, due to cobalt as a binder, it has toughness.

During his last decade, Leary proclaimed the "PC is the LSD of the 1990s" and re-worked the phrase into "turn on, boot up, jack in" to suggest joining the cyberdelic counterculture.[7]

c.Due to the reduced size of the die, the heat treatment operation is easy and the heat treatment quality can be improved.

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By the early 1980s, while on a speaking tour with G. Gordon Liddy, the phrase had transformed to "turn on, tune in, take over."[6]

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Turn on, Tune in, Drop out is also the title of a book (ISBN 1-57951-009-4) of essays by Timothy Leary, covering topics ranging from religion, education, and politics to Aldous Huxley, neurology, and psychedelic drugs.

Because the cemented carbide die material has the above characteristics, and the cemented carbide composite die is used, the die life is 40 to 60 times that of the overall structure die, or even as high as 200 times. Therefore, cemented carbide is a cheap and ideal die material.

"Turn on" meant go within to activate your neural and genetic equipment. Become sensitive to the many and various levels of consciousness and the specific triggers engaging them. Drugs were one way to accomplish this end. "Tune in" meant interact harmoniously with the world around you—externalize, materialize, express your new internal perspectives. "Drop out" suggested an active, selective, graceful process of detachment from involuntary or unconscious commitments. "Drop Out" meant self-reliance, a discovery of one's singularity, a commitment to mobility, choice, and change. Unhappily, my explanations of this sequence of personal development are often misinterpreted to mean "Get stoned and abandon all constructive activity".[4]

Toughness is an important performance index for die steel, especially for die steel that manufactures working dies under impact load conditions. Generally used as die steel with hardness lower than 50~55HRC, and high toughness.

In the process of cold heading of standard parts, the cemented carbide composite die has to bear a large impact force. In order to meet the requirements of use, it is necessary to select cemented carbide with high cobalt content, high strength and good impact toughness. Carbide alloys such as CG5, CA18, CA24.

In the standard fastener industry, cold heading dies have to bear a large unit pressure during the cold heading deformation process. When the deformation degree is large and the material hardness is high, the unit pressure can reach more than 2,000MPa. At the same time, the metal flows violently, so the cold heading die is required to have high strength, good fatigue resistance, high hardness and good fatigue resistance, so as to ensure that the die is not damaged, deformed, and wear-resistant under high pressure.

In a 1988 interview with Neil Strauss, Leary said the slogan was "given to him" by Marshall McLuhan during a lunch in New York City. Leary added McLuhan "was very much-interested in ideas and marketing, and he started singing something like, 'Psychedelics hit the spot / Five hundred micrograms, that's a lot,' to the tune of a Pepsi commercial of the time. Then he started going, 'Tune in, turn on, and drop out.'"[1] The phrase was used by Leary in a speech he delivered at the opening of a press conference in New York City on September 19, 1966. It urged people to embrace cultural changes through the use of psychedelics by detaching from the existing conventions and hierarchies in society. It was also the motto of his League for Spiritual Discovery.[2]

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