Preparation method of thin-wall A-type graphite casting piece A
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A technology of graphite and castings, which is applied in the field of preparation of thin-walled A-type graphite castings, and can solve the problems that the oil passages in the inner cavity are prone to have pores and scars, which cannot meet the requirements of tensile strength, hardness and air tightness
Inactive Publication Date: 2013-07-24
LAIZHOU XINZHONGYAO MACHINERY
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is to provide a preparation method of thin-walled A-type graphite castings, so as to solve the problem that the thin-walled A-type graphite castings produced by the current casting process cannot meet the requirements of ideal tensile strength, hardness and airtightness or The microstructure of A-type graphite does not reach more than 90% or the oil channel in the inner cavity is prone to problems such as pores, sand sticking, scarring, and veins
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Embodiment 1
[0053] On April 7, 2012, eight 50237500-type castings were produced according to the above method. The composition of the castings was tested: carbon 3.35%, silicon 1.9%, manganese 0.89%, sulfur 0.08%, chromium 0.226%, copper 0.516%, A-type graphite> 90 %.
[0054] The body hardness is 194HBW, the tensile strength is 260 MPa, and the air tightness test pressure is greater than 20bar.
Embodiment 2
[0056] On April 17, 2012, eight 50234700-type castings were produced according to the above method. The composition of the castings was tested: carbon 3.34%, silicon 1.82%, manganese 0.908%, chromium 0.259%, copper 0.551%, and A-type graphite> 90%.
[0057] The body hardness is 205HBW, the tensile strength is 263 MPa, and the air tightness test pressure is greater than 20bar.
Embodiment 3
[0059] On May 4, 2012, eight 50237100-type castings were produced according to the above method. The composition of the castings was tested: carbon 3.36%, silicon 1.8%, manganese 1.09%, chromium 0.254%, copper 0.6%, and A-type graphite> 90%.
[0060] The body hardness is 198HBW, the tensile strength is 259 MPa, and the air tightness test pressure is greater than 20bar.
[0061] Moreover, it can be seen from the drawings of the description that the metallographic structure of the A-type graphite casting produced by the method of the present invention is more uniform, the graphite distribution is more uniform and non-directional, and it reaches the A-type graphite standard stipulated by the state.
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Abstract
The invention relates to a preparation method of a thin-wall A-type graphite casting piece. The preparation method comprises the following steps of: preparing materials, preparing a core, modeling, melting, casting and inspecting, wherein according to the material preparing process, a smelting furnace burden is prepared by using the following components in parts by weight: 82 parts of gray pig iron with tensile strength of being bigger than and equal to 300MPa, 18 parts of medium-low carbon steel, 1.5 parts of ferrous sulfide with sulfur content of 35%-48%, 3 parts of chromium iron with chromium content of 60%, 0.4-0.5 part of copper and 5-8 parts of graphite carburant. The preparation method of the thin-wall A-type graphite casting piece can be used for solving the problems that the thin-wall A-type graphite casting piece produced by the existing casting process cannot reach the ideal tensile strength, hardness and air tightness requirements or micro-structure A-type graphite cannot reach 90% or higher or the inner cavity oil path has air pores, burnt-on sand, scabs, veined lines and the like.
Description
technical field [0001] The invention relates to the field of material casting, in particular to a method for preparing a thin-walled A-type graphite casting. Background technique [0002] Castings are metal shaped objects obtained by various casting methods. Castings are widely used, such as large machinery, machine tools, ships, aerospace, automobiles, locomotives and other industries. The quality of castings has a great influence on the performance of mechanical products. For example, the wear resistance and dimensional stability of machine tool castings directly affect the precision and maintenance life of machine tools; Excitement directly affects the working life of the engine. [0003] Gray cast iron refers to cast iron with flake graphite. The main components are iron, carbon, silicon, manganese, sulfur and phosphorus. It is the most widely used cast iron, and its output accounts for more than 80% of the total output of cast iron. The mechanical properties of gray...
Claims
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