Additive manufacturing method of functionally gradient composite plunger pump plunger
An additive manufacturing and functional gradient technology, applied in the field of plunger pumps, can solve the problems of shortening the service life of the plunger pump, corrosion and wear on the surface of the friction pair, and damage to the surface of the friction pair, so as to improve the bearing capacity and improve its wear resistance and corrosion resistance. performance, improved corrosion resistance, and the effect of strong bonding ability
Inactive Publication Date: 2021-10-19
UNIV OF JINAN
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Problems solved by technology
The main component of the friction pair is structural steel. When in contact with chloride ion plasma, oxidation-reduction reaction will occur, resulting in corrosion on the surface of the friction pair. At the same time, there will be sand wear and wear between the friction pairs. Under the joint action of long-term corrosion and wear, the surface of the friction pair is severely corroded and worn, which will aggravate the damage of the surface of the friction pair, thereby shortening the service life of the plunger pump
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[0029] Such as figure 1 , 2 As shown, the preparation method of the 3D printed plunger pump plunger gradient composite material is specifically implemented as follows:
[0030] The base material type for the plunger 3D printing is 38CrMoAl, and its composition is:
[0031] Carbon C: 0.35~0.42; Silicon Si: 0.20~0.45; Manganese Mn: 0.30~0.60; Sulfur S: Allowable residual content ≤0.035; Phosphorus P: Allowable residual content ≤0.035; Chromium Cr: 1.35~1.65; Aluminum Al: 0.70 ~1.10; Nickel Ni: Allowable residual content ≤0.30; Copper Cu: Allowable residual content ≤0.30; Molybdenum Mo: 0.15~0.25.
[0032] The size of 38CrMoAl bar depends on the specifications of the plunger pump.
[0033] Step 1), preparing the first mixed powder, the second mixed powder, the third mixed powder, the fourth mixed powder, the fifth mixed powder, and the sixth powder;
[0034] The first mixed powder is made by mixing 95wt% Ni25 and 5wt% Mo according to mass percentage;
[0035] The second mixe...
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Abstract
The invention discloses an additive manufacturing method of a functionally gradient composite plunger pump plunger. The additive manufacturing method comprises the following steps that (1) first to fifth mixed powder and sixth powder are prepared; 2) the first to fifth mixed powder and the sixth powder are correspondingly dried; (3) a 38CrMoaAl bar is subjected to pretreatment; (4) laser 3D printing process parameters are set, wherein the power is 1000 W, the light spot shape is round, the light spot size is 2 mm, the lap joint rate is 40%, and the scanning speed is 300 mm / min; the first mixed powder is used for conducting 3D printing on a first gradient composite material layer around the 38CrMoAl bar, and the thickness is 5 cm; and the second to fifth mixed powder is used for sequentially cladding the second to fifth gradient composite material layers with the thickness being 1 mm, and finally, the sixth powder is used for continuously conducting 3D printing on the periphery of the fifth gradient composite material layer, and the thickness of the sixth gradient composite material layer is 5 cm. The surface wear resistance and corrosion resistance of the prepared plunger are improved, the interior of the plunger has certain toughness, and the plunger has certain impact resistance.
Description
technical field [0001] The invention relates to the technical field of plunger pumps, in particular to an additive manufacturing method for plungers of functionally graded composite plunger pumps. Background technique [0002] At present, my country's per capita water resources are only 2300m 3 , which is only 1 / 4 of the world's average level, and is one of the countries with the most water shortage per capita in the world. The economic losses caused by water shortage amount to hundreds of billions of yuan every year, and the shortage of fresh water resources is a serious problem facing our country and even the whole mankind. Seawater desalination is an effective way to alleviate and solve the problem of scarcity of freshwater resources. Reverse osmosis desalination is currently the most widely used technology. The plunger pump is the core power component of the reverse osmosis seawater desalination system, and its function is to provide the high pressure required in the ...
Claims
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IPC IPC(8): B22F7/04B22F10/28B22F1/00C23C24/10B33Y10/00
CPCB22F7/04B22F10/28C23C24/106B33Y10/00B22F2207/01Y02P10/25
Inventor 张建鹏王守仁王高琦孙秀怀李重阳周超刘文龙时晓宇李金坤
Owner UNIV OF JINAN