Preparation method of strengthened steel pill
A technology for strengthening steel and steel shots, which is applied in the direction of manufacturing tools, metal processing equipment, abrasives, etc., can solve the problems of large hardness deviation, short service life, and easy breakage, and achieve small differences in surface shape, long service life, and surface strength. high effect
Inactive Publication Date: 2009-01-07
CSIC DALIAN NEW MATERIALS CO LTD
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The steel shot produced by these two methods has the following defects: the density, surface shape, and element ratio of the steel shot are not easy to control, and the hardness deviation is large, and it is easy to produce hollow and surface microcracks. Insufficient impact and friction resistance, easy to break, short service life
Especially when it is used for shot blasting and strengthening treatment of high-strength steel, such as for metal surface treatment in industries such as large aircraft manufacturing, aerospace, automobile, motorcycle, shipbuilding, transmission, spring manufacturing, etc. The shortcomings are particularly prominent, and it cannot meet the technological requirements of changing the surface stress state of the workpiece, hardening the surface of the workpiece, and improving the wear resistance and fatigue resistance of the parts.
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[0016] A kind of reinforced steel shot, its weight percentage is composed of carbon 0.45-0.85%, manganese 0.30-1.30%, silicon 0.15-0.35%, sulfur ≤ 0.050%, phosphorus ≤ 0.040%, and the balance is iron and unavoidable impurities. The average hardness is 640HV, and the hardness deviation range is ±25HV.
[0017] Reinforced steel shot can be divided into four categories according to the shape:
[0018] Cylindrical type - code-named Z;
[0019] Ellipse - code-named G1;
[0020] Quasi-spherical type - code-named G2;
[0021] Ball type - code-named G3.
[0022] To produce the above-mentioned reinforced steel shot, its production process is:
[0023] Material selection→drawing→cutting→sieving→testing→storage,
[0024] Or: material selection→wire drawing→cutting→surface rounding strengthening→sieving→testing→storage.
[0025] The selection of materials refers to the selection of elemental components according to the percentage by weight: carbon 0.45-0.85%, manganese 0.30-1.30%, s...
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Abstract
A method for manufacturing a reinforced steel shot relates to a method for manufacturing metal products, particularly to a method for manufacturing the reinforced steel shot used for the metal surface treatment. The method for manufacturing the reinforced steel shot comprises the following process flow: selecting a material, drawing wires, cutting, screening, detecting and storing; or selecting a material, drawing wires, cutting, rounding and reinforcing the surface, screening, detecting, and storing. Since the reinforced steel shot is made of a sectional material, namely a spring steel wire, which is in accordance with requirements of the elementary composition proportion and the hardness deviation range, the density and the consistence of element proportion of the reinforced steel shot are high. Since a novel process is adopted, the reinforced steel shot has the advantages of no occurrence of hollow and surface cracking phenomena, small difference of surface shapes, high surface strength and long service life. The produced reinforced steel shot by using the method is particularly suitable for the high-end workpiece surface treatment.
Description
technical field [0001] The invention relates to a method for preparing a metal product, in particular to a method for preparing a reinforced steel shot for metal surface treatment. technical background [0002] At present, in our country, there are mainly two methods for producing steel shot for metal surface treatment, one is to extract from scrap steel and iron mud, and the other is to produce it by atomization. The steel shot produced by these two methods has the following defects: the density, surface shape, and element ratio of the steel shot are not easy to control, and the hardness deviation is large, and it is easy to produce hollow and surface microcracks. The impact and friction resistance are not enough, it is easy to break, and the service life is short. Especially when it is used for shot blasting and strengthening treatment of high-strength steel, such as for metal surface treatment in industries such as large aircraft manufacturing, aerospace, automobile, mot...
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IPC IPC(8): B23P15/00B24C11/00G01N3/42G01N3/56
Inventor 冯艳华王奇王静邱锋
Owner CSIC DALIAN NEW MATERIALS CO LTD
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