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High indomitable and firm metal gradient structure shaft and its preparation mehtod

A gradient structure, high-strength technology, applied in the field of parts processing and manufacturing, can solve the problems of undiscovered, fractured, and high cost, and achieve the effect of avoiding catastrophic consequences

Inactive Publication Date: 2005-10-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the alloy steel shaft can meet the requirements of good surface wear resistance and good core toughness by formulating a reasonable heat treatment process, it is difficult to ensure that the strength and toughness of the alloy steel shaft are uniform along the shaft section and length direction by using the heat treatment process Changes, and because it is the same material, once micro-cracks appear on the surface, they can directly expand to the core, causing fracture
Therefore, the outstanding shortcomings of the current shaft parts are: (1) shafts made of high-quality and precious metals, although the quality is good, but the cost is too high; The shaft has stress concentration during use and lacks the function of crack blocking. Once micro cracks exist, the overall fracture will occur rapidly, resulting in catastrophic consequences
At present, no product and manufacturing method identical or similar to the present invention have been found

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: Manufacture of gradient structure transmission shaft

[0019] 1. Choose a 40Cr steel pipe with an outer diameter of 50mm, an inner diameter of 22mm and a length of 300mm and a 22mm ordinary carbon steel round steel.

[0020] 2. Clean the surface of 40Cr steel pipe and ordinary carbon steel round steel through degreasing, pickling, rinsing, drying and other processes;

[0021] 3. Use a rotating wire brush to brush the steel surface until the metal surface is fully exposed to fresh metal;

[0022] 4. Assemble the 40Cr steel pipe and ordinary carbon steel round steel into a rough billet.

[0023] 5. Use argon to clean the assembled rough round steel billet, so that the assembly layer maintains an inert atmosphere;

[0024] 6. Weld and seal the two ends of the round steel rough billet under the protection of argon to become a round billet to be rolled;

[0025] 7. Use a heating furnace to quickly heat the assembled and welded round billet to be rolled at a ...

Embodiment 2

[0028] Embodiment 2: Manufacture of hub shaft with gradient structure

[0029] 1. Select GCr15 steel pipe with an outer diameter of 50mm, an inner diameter of 22mm and a length of 150mm and a 22mm 45 # round steel.

[0030] 2. The GCr15 steel pipe and 45 # The surface of the round steel is cleaned by degreasing, pickling, rinsing, drying and other processes;

[0031] 3. Use a rotating wire brush to brush the steel surface until the metal surface is fully exposed to fresh metal;

[0032] 4. The GCr15 steel pipe and 45 # The round steel is assembled into a rough billet.

[0033] 5. Use argon to clean the assembled rough round steel billet, so that the assembly layer maintains an inert atmosphere;

[0034] 6. Weld and seal the two ends of the round steel rough billet under the protection of argon to become a round billet to be rolled;

[0035] 7. Use a heating furnace to quickly heat the assembled and welded round billet to be rolled at a speed of 200°C per minute, and keep...

Embodiment 3

[0038] Embodiment 3: Spiral fitting method of composite structure shaft blank

[0039] 1. Select high-carbon alloy steel pipe, medium-carbon alloy steel pipe and ordinary carbon steel round steel as raw materials;

[0040] 2. Make the selected raw materials into threads that can cooperate with each other;

[0041] 3. The surface is cleaned by degreasing, pickling, rinsing, drying and other processes;

[0042] 4. Brush the surface of the steel with a rotating wire brush until the fresh metal is fully exposed on the metal surface;

[0043] 5. Combine the blanks into composite shaft blanks;

[0044] 6. Weld and seal the two ends of the round steel rough billet under the protection of argon to become a round billet to be rolled;

[0045] 7. Use a heating furnace to quickly heat the assembled and welded round billet to be rolled at a speed of 200°C per minute, and keep the heating temperature at 850°C for 120 minutes;

[0046]8. Roll the heated round billet into a predetermined...

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Abstract

A high-strength and-toughness metallic shift with gradient structure features that it is composed of 2-15 days which are respectively made of expensive high-quality alloy steel and cheap carbon steel or microalloyed steel. The high-strength antiwear materials are used for its surficial layers and the high-toughness materials are used for its core layers in order to transfer torque. Its preparing process is also disclosed.

Description

technical field [0001] The invention belongs to the technical field of parts processing and manufacturing, and in particular provides a high-strength, toughness, and wear-resistant gradient structural shaft and a manufacturing method thereof. Metal gradient structure materials have broader application prospects in the fields of machinery, metallurgy, transportation, mining, weapons and aviation. Background technique [0002] The shaft is an important part of a mechanical device, and it is widely used in the fields of machinery, metallurgy, transportation, mining, weapons and aviation. The main function of the shaft is to support rotating parts and transmit torque. Under the action of alternating loads such as bending and torsion, the surface of the shaft bears high stress, and the journal is also subject to greater friction and wear under the relative motion with the bearing, which requires the surface of the part to have higher strength, Hardness, wear resistance and high...

Claims

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Application Information

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IPC IPC(8): B32B15/01
Inventor 任学平侯红亮许荣昌金宪哲唐荻
Owner UNIV OF SCI & TECH BEIJING
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