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Production method of cast-state ductile iron QT800-5 by using fired mold precision casting

A technology of investment precision casting and production methods, which is applied in the direction of casting molding equipment, casting molds, and casting mold components, etc., can solve the problems of no investment casting precision casting cast ductile iron QT800-5 technology, etc., and achieve the as-cast Effects of heat-free treatment, increasing pearlite content, and improving mechanical properties

Inactive Publication Date: 2018-11-13
DONGFENG PRECISION CASTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no process for investment precision casting cast ductile iron QT800-5

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: A production method of investment precision casting cast ductile iron QT800-5, the matrix structure is a pearlite matrix, the pearlite content is ≥ 85%, the spheroidization level is 1 to 2, and the graphite size is 6 to 7 The final chemical composition of the material is: C:3.71%, Si:2.05%, Mn:0.71%, Mo:0.17%, P:≤0.034%, S:≤0.014%, Cu:0.84%, Mg:0.039 %, RE: 0.026%, the balance is Fe;

[0018] For obtaining above-mentioned QT800-5 ductile iron, its production method is as follows:

[0019] 1) Investment casting shell making and roasting: shell making and roasting are unique processes of investment casting technology; shell making uses silica sol binder, quartz sand powder and mullite powder are used as the shell surface respectively The sanding material for the coating layer and the back layer; the shell is baked in a through-type natural gas roasting furnace, the roasting temperature is controlled at 935 ° C, and the roasting time is 3.5 hours;

[0020] 2) ...

Embodiment 2

[0026] Example 2: A production method of investment precision casting cast ductile iron QT800-5, the matrix structure is a pearlite matrix, the pearlite content is ≥ 85%, the spheroidization level is 1-2, and the graphite size is 6-7 The final chemical composition of the material is: C:3.76%, Si:2.06%, Mn:0.67%, Mo:0.18%, P:≤0.03%, S:≤0.01%, Cu:0.8%, Mg:0.045 %, RE: 0.029%, the balance is Fe;

[0027] For obtaining above-mentioned QT800-5 ductile iron, its production method is as follows:

[0028] 1) Investment casting shell making and roasting: shell making and roasting are unique processes of investment casting technology; shell making uses silica sol binder, quartz sand powder and mullite powder are used as the shell surface respectively The sanding material for the coating layer and the back layer; the shell is baked in a through-type natural gas roasting furnace, the roasting temperature is controlled at 950 ° C, and the roasting time is 3 hours;

[0029] 2) Molten iron...

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Abstract

The invention discloses a production method of a cast-state ductile iron QT800-5 by using fired mold precision casting. The method comprises the following steps of fired mold precision casting of shell and shell making, molten iron smelting, spheroidizing treatment, inoculation treatment, mold shell casting and module cooling so as to obtain the QT800-5, wherein the requirements that the tensile strength Rm is larger than or equal to 800 MPa and the elongation percentage after fracture A is larger than or equal to 5% can be met. The production method of cast-state ductile iron QT800-5 by usingthe fired mold precision casting has the beneficial effects that low-cost copper and manganese are added to improve a pearlite content in a cast-state ductile iron matrix, the structure is strengthened and refined, the mechanical property of a material is improved, the cost can be effectively reduced, and the cast-state heat-free treatment is realized; and meanwhile, deformation is avoided afterthe heat treatment of a casting is avoided.

Description

technical field [0001] The invention belongs to the field of casting high-performance black metal materials, and relates to the production of investment casting ductile iron castings, in particular to a production method of investment casting precision casting cast ductile iron QT800-5. Background technique [0002] In order to reduce vibration, improve the driving comfort of passenger cars, reduce the quality of the whole vehicle, and improve the performance of automotive casting parts, more and more passenger car OEMs are willing to use ductile iron materials, but the medium and high performance balls in ordinary ductile iron grades Iron, such as QT600-3, QT700-2, QT800-2 and other grades, has limited its popularization and application in auto parts because of its low elongation. Although Aube ductile iron has good comprehensive mechanical properties, it is difficult to replace the existing ordinary cast steel and cast iron auto parts due to high heat treatment process and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/04C22C33/10B22C9/04
CPCB22C9/04C22C33/10C22C37/04C22C37/10
Inventor 陈娟陈礼年马波
Owner DONGFENG PRECISION CASTING CO LTD
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