High-life gray iron for forming metal casting mould and preparation method of high-life gray iron
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A mold forming and metal molding technology, which is applied in the field of high-life gray iron for metal casting mold molding and its preparation, can solve the problems of reducing the manufacturing cost and construction period of metal molds, and achieve the effect of high thermal conductivity and slow growth
Inactive Publication Date: 2020-06-26
CHINA FIRST AUTOMOBILE +1
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[0003] The invention provides a new type of gray iron, the performance of gray iron meets the requirements for the use of metal molded parts of electric motor shells, and
Method used
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[0036] Example 1
[0037] Use the gray iron material of this application to make the motor shell mold, and the alloy and proportion are as follows:
[0038]
[0039] The mechanical properties are as follows:
[0040] Hardness≥HB180.
[0041] Tensile strength ≥ 240MPa.
[0042] The mold life reaches 40,000 mold times.
[0043] The deformation ratio is less than 0.00001.
Example Embodiment
[0044] Embodiment 2
[0045] Using this application to produce engine cylinder head molds, the alloys and proportions are as follows:
[0046]
[0047] The mechanical properties are as follows:
[0048] The mold life reaches 51,000 mold times.
[0049] The deformation ratio is less than 0.00001.
[0050] Hardness: Hardness ≥HB190.
[0051] Strength: Tensile strength ≥ 250MPa.
Example Embodiment
[0052] Embodiment 3
[0053] The alloy and proportion of the new energy vehicle sub-frame mold using the material of the present invention are as follows:
[0054]
[0055] The surface roughness reaches 3.2;
[0056] The demoulding force is lower than that of die steel;
[0057] The mechanical properties are as follows:
[0058] Hardness: Hardness≥HB200.
[0059] Tensile strength ≥ 270MPa.
[0060] The life of the mold reaches 57,000 mold times.
[0061] The deformation amount ratio is less than 0.00001.
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Abstract
The invention belongs to the technical field of metal casting, and particularly relates to high-life gray iron for forming a metal casting mould and a preparation method of the high-life gray iron. The high-life gray iron for forming the metal casting mould is prepared from the following elements in percentage by weight: 3.0-3.3 of C, 1.8-2.1 of Si, less than or equal to 0.8 of Mn, less than or equal to 0.06 of P, less than or equal to 0.05 of S, 0.3-0.5 of Cu, 0.5-0.8 of Mo, 1.9-2.2 of Cr,1.9-2.2 of Ni and the balance of Fe. The novel gray iron is provided, the gray iron performance can meetthe use requirements of motor shell metal mould forming parts, and the manufacturing cost and time limit of the metal mould can be greatly reduced; and the high-life gray iron prepared by the method has high thermal conductivity, high thermal fatigue resistance, high deformation resistance, high growth resistance and high strength.
Description
technical field [0001] The invention belongs to the technical field of metal casting, in particular to a high-life gray iron for casting a metal mold and a preparation method thereof. Background technique [0002] With the rise of the electric vehicle industry, the demand for aluminum alloy motor casings has grown rapidly. Electric vehicle OEMs require motor casings with low prices and short delivery times, which pose severe challenges to motor casing suppliers and mold suppliers. Motor shell molds generally use expensive imported mold steel or high-end domestic high-physicochemical index mold steel with huge consumption as mold forming materials. The use of mold steel to manufacture motor shell mold materials is very high; the acquisition cycle is very long; energy consumption and environmental emissions Much. SUMMARY OF THE INVENTION [0003] The invention provides a new type of gray iron, the performance of the gray iron meets the use requirements of the metal mold for...
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