A high-strength fastener isothermal spheroidizing annealing cold heading forming method
A technology of isothermal spheroidizing annealing and forming method, which can be used in furnace types, furnaces, heat treatment equipment, etc., and can solve the problems of poor carbonization morphology, large carbide particle size, and insufficient spheroidization of annealed products.
Active Publication Date: 2021-01-15
浙江日星标准件有限公司
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Problems solved by technology
[0004] The present invention aims to solve the problems of insufficient spheroidization, poor annealed carbonization form and large carbide particle size in the isothermal spheroidization annealing of existing fasteners, and provides a fully spheroidized, good carbide form and carbonization after annealing. The size of the object is small, so as to improve the strength of the fastener to be processed, and the process is simple, and the method of isothermal spheroidizing annealing and cold heading for high-strength fasteners is easy to use
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Embodiment
[0024] Embodiment, a high-strength fastener isothermal spheroidizing annealing cold heading forming method, see figure 1 As shown, the method includes the following steps: 1: Put the parts to be processed into the annealing furnace 1 in layers, and feed pure nitrogen to empty the air in the furnace, and preheat the annealing furnace 1 after feeding methanol cracking gas to 300°C; 2: take 300±50min to heat the annealing furnace 1 once to 630°C, and keep it at 630°C for 90min to austenitize the parts; 3: take 105±15min to heat the annealing furnace 1 Carry out a second temperature rise to 745±5°C, and hold at a temperature of 745±5°C for 300min isothermal spheroidization; 4: use 105±15min to anneal the annealing furnace 1 once and cool it down to 700±5°C, and Insulate at a temperature of 700±5°C for 60 minutes; 5: take 180±30 minutes to perform secondary annealing on annealing furnace 1 and cool it down to 650°C; 6: take 75±15 minutes to perform three annealing on annealing furn...
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The invention discloses an isothermal spheroidizing annealing cold-heading forming method for a high-strength fastener, and belongs to the technical field of fastener processing process. According tothe method, a fastener can be fully spheroidized; after annealing, the carbide morphology is good and the carbide size is small, and then the purpose of improving the strength of the fastener to be processed is achieved; and moreover, the method is simple in process and convenient to use. The method comprises the following steps: firstly, preheating to 300 DEG C; secondly, performing primary heating to 630 DEG C, and preserving heat for 90 minutes at the temperature of 630 DEG C; thirdly, performing secondary heating to 745+ / -5 DEG C, and preserving the heat for 300 minutes at the temperatureof 745+ / -5 DEG C; fourthly, performing primary annealing and cooling to 700+ / -5 DEG C, and preserving the heat for 60 minutes at the temperature of 700+ / -5 DEG C; fifthly, performing secondary annealing and cooling to 650 DEG C; sixthly, performing tertiary annealing and cooling to 550 DEG C; and seventhly, introducing high-purity nitrogen into an annealing furnace, and quickly cooling to the temperature below 80 DEG C, then, taking out the component, and naturally cooling to room temperature.
Description
technical field [0001] The invention relates to the technical field of fastener processing technology, in particular to an isothermal spheroidizing annealing cold heading forming method for high-strength fasteners. Background technique [0002] In recent years, the increase of non-standard and special-shaped products in the fastener industry has resulted in the rapid development of the cold extrusion process. Due to the different specifications and shapes of the products, this will inevitably bring higher requirements for the softening treatment of these parts. For example, the commonly used cold heading steel wires ML8Ae, ML10, ML15 or ML20 all require spheroidizing annealing to obtain uniformly distributed spherical carbide structures on the ferrite matrix; the spheroidizing structures have low hardness and good plasticity, and cold working or Cracks are not easy to occur during cold extrusion. [0003] For example, the Chinese invention patent with the notification numbe...
Claims
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IPC IPC(8): C21D1/32C21D1/74C21D9/00
CPCC21D1/32C21D1/74C21D9/0068C21D9/0093
Inventor 赵关祥陈雪军陈国芳沈高飞朱瑞生
Owner 浙江日星标准件有限公司