Spheroidal graphite cast iron cast gear and machining process thereof

A technology for ductile iron and cast gears, which is applied in the field of gear processing of passenger car gearboxes, can solve the problems of low forging production efficiency, poor dimensional accuracy of forged gear blanks, and high prices, and achieve precise control of heating temperature, guarantee of melting efficiency, and material The effect of low burn rate

Active Publication Date: 2016-02-17
山东惠宇汽车零部件有限公司
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Problems solved by technology

However, traditional gear production is forged from gear steel (including low-carbon steel, low-carbon alloy steel, medium-carbon steel, and medium-carbon alloy steel), and forming steel must be used, with strict composition requirements and relatively high prices
Moreover, forging production efficiency is low, generally no more than 500 pieces per

Method used

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Embodiment Construction

[0022] The present invention will be further described below in combination with specific embodiments.

[0023] A ductile cast iron casting gear, which mainly includes the following components in weight percentage: C is 3.5-3.6%; Si is 2.3-2.4%; Mn is 0.4-0.45%; Cr<0.1%; Cu is 0.4-0.45%; Mg is 0.03-0.045%; S≤0.02%; P≤0.05%; the balance is Fe.

[0024] The processing technology of ductile cast iron casting gear of the present invention comprises the following steps:

[0025] (1) Melting molten iron: Put the ingredients of each raw material into a coreless intermediate frequency induction furnace according to the required ratio, and heat up to melt the molten iron; among them, the heating temperature is 1490-1510°C, preferably 1500°C, and the temperature is kept for 60 minutes to ensure that the slag in the molten iron is Can float to the surface smoothly, so as to obtain clean molten iron;

[0026] (2) Spheroidization inoculation: adding spheroidizing cored wire to the molten...

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Abstract

The invention discloses a spherodial graphite cast iron cast gear and a machining process thereof. The spherodial graphite cast iron cast gear mainly comprises, by weight, 3.5%-3.6% of C, 2.3%-2.4% of Si, 0.4%-0.45% of Mn, less than 0.1% of Cr, 0.4%-0.45% of Cu, 0.03%-0.045% of Mg, not larger than 0.02% of S, not larger than 0.05% of P and the balance Fe. The machining process of the gear includes the following steps of firstly, molten iron smelting, secondly, spheroidizing inoculation, thirdly, casting molding, fourthly, shot blasting, fifthly, thermal treatment, sixthly, rough machining, seventhly, surface hardening and eighthly, finish machining. According to the cast gear, low-manganese scrap steel serves as a raw material, production cost can be lowered, and the gear cast through spherodial graphite cast iron has the comprehensive performances of being high in strength, high in wear resistance and high in flexibility and can meet the requirement of a transmission gear.

Description

technical field [0001] The invention belongs to the field of processing gears of gearboxes for passenger vehicles, and in particular relates to a casting gear made of ductile iron and a processing technology thereof. Background technique [0002] Gearbox gears are important transmission components, requiring high strength, good toughness and surface wear resistance. However, traditional gear production is forged from gear steel (including low-carbon steel, low-carbon alloy steel, medium-carbon steel, and medium-carbon alloy steel), and forming steel must be used, with strict composition requirements and relatively high prices. Moreover, forging production efficiency is low, generally no more than 500 pieces per hour; forgings need to consume more energy during blanking and forging processes, which increases production costs and causes energy waste; forged gear blanks have poor dimensional accuracy and processing If the margin is large and the control is not good, it is easy...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/04C22C33/08C21C1/10C21D9/32C21D5/00C21D1/18
CPCC21C1/105C21D1/18C21D5/00C21D9/32C21D2211/008C21D2221/10C22C33/08C22C37/04C22C37/10Y02P10/20
Inventor 樊宪国
Owner 山东惠宇汽车零部件有限公司
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