Alloy austenitic-bainite ductile iron worm gear and preparation process thereof

A technology of Aube ductile iron and worm gear, which is applied in the field of Aobei ductile iron worm gear and its preparation, which can solve the problems of high production cost and achieve the effects of high yield, easy control and small wear

Active Publication Date: 2010-06-16
YANGZHOU ELECTRIC POWER EQUIP MFG FACTORY CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the worm gear material on the valve electric actuator (or valve electric ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Operation process: new iron, mild steel, carbon rods are used as raw materials, the alloy composition is C 3.5-3.7%, Si 2.3-2.5%, Mn 0.15-0.20%, P 0.025-0.03%, S 0.022-0.03%, Mo 0.18 ~0.20%, Cu 0.45~0.55%, Ni 0.4~0.5%, and the balance is iron. Melting in an intermediate frequency furnace, using waste electrodes to increase carbon, using rare earth magnesium alloy as a nodulizer, and 75% ferrosilicon as an inoculant, to ensure that the spheroidization rate of the as-cast worm gear blank is 2 grades, and the ball diameter is 6 to 7 grades. After the rough machining of the worm gear blank, heat it to 910-930°C, keep it warm for 1.5 hours, quench it into a salt bath with a final temperature of 410-425°C in the salt bath, and finish the hobbing in the salt bath for 1.2 hours to make the Aube ductile iron worm gear .

[0019] Technical indicators: about 25-30% retained austenite, cementite ≤ 1%, mechanical properties: tensile strength 845-855Mpa, hardness HRC24-25, elongatio...

Embodiment 2

[0021] Except C 3.8~3.9%, S 0.015~0.02%, Mo 0.15~0.18%, Cu 0.55~0.6%, the others are the same as Example 1.

[0022] Technical indicators: about 28-32% of retained austenite, less than 1% of cementite, mechanical properties of tensile strength of 870-880Mpa, hardness of HRC24-25, and elongation of 8.5-9.5%.

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Abstract

The invention relates to an alloy austenitic-bainite ductile iron worm gear and a preparation process thereof. The worm gear comprises the following components in percentage by weight: 3.5 to 3.9 percent of C, 2.3 to 2.9 percent of Si, less than or equal to 0.4 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.03 percent of S, 0.2 to 0.3 percent of Mo, 0.3 to 0.6 percent of Cu, 0.2 to 0.5 percent of Ni and the balance of iron. The preparation process comprises the following steps: smelting the components, taking a rare earth magnesium alloy as a spheroidizing agent and ferrosilicon as an inoculating agent, and casting a blank after treatment; roughly machining the blank of the worm gear, heating and isothermally quenching to obtain a proper amount of retained austenite; and finishing a gear to prepare the alloy austenitic-bainite ductile iron worm gear. The worm gear has the advantages to high fatigue resistance, high pitting resistance, lower density than steel, small deformation and the like, and is suitable for replacing a worm gear on a valve electric actuator made of a copper alloy or zinc base alloy (ZA27) so as to obviously reduce production cost.

Description

technical field [0001] The invention relates to an Aube ductile iron worm gear on a worm gear transmission pair of a valve electric actuator (or a valve electric device) and a preparation method thereof. Background technique [0002] At the end of the 1970s, Finland, the United States and China announced the successful research of ADI (ADI) almost at the same time. Since then, ADI has become a new member of the ductile iron family. Aubic ductile iron (ADI) is a new type of engineering material with excellent comprehensive performance, high strength, high wear resistance, good plasticity and low temperature toughness, etc., and is widely used in important components with high performance and high precision . At present, this material has been gradually and successfully applied to gear parts in China. [0003] At present, the material of the worm wheel on the valve electric actuator (or valve electric device) basically adopts copper alloy or zinc-based alloy (ZA27), and the...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/04C21D1/20F16H55/22
Inventor 唐涛樊高鹏蔡军汤占峰吴春光
Owner YANGZHOU ELECTRIC POWER EQUIP MFG FACTORY CO LTD
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