Patent Application
20210025039
This application claims priority to Chinese application No. 201910677170.6 entitled, “Preparation process of high-performance, low-cost, long-life aluminum cylinder sleeve,” filed Jul. 25, 2019 by Inventor/Applicant Fan Xingkuan.
The invention belongs to a special structural alloy material, and specifically relates to a preparation process of a high-performance, low-cost, long-life aluminum alloy cylinder liner.
The invention belongs to a special structural alloy material, and specifically relates to a preparation process of a high-performance, low-cost, long-life aluminum alloy cylinder liner.
The high-pressure mud pump is the heart of the oil drilling and geological exploration workbench. The mud pump cylinder liner is an important component of the mud pump. The currently used mud pump cylinder liner is divided into bimetallic cylinder liner, pure alumina ceramic cylinder liner and pure oxidation It is made of three materials of lead ceramic cylinder liner: It is made from thousands of working conditions, the metal cylinder liner is not wear-resistant, corrosion-resistant, and erosion-resistant, and the service life is very short; the pure alumina ceramic cylinder liner has low strength and toughness. It is easy to break under high pressure; the pure lead oxide ceramic sleeve is easy to powder, low thermal conductivity, large expansion coefficient, low hardness, easy to damage the matching piston, and high processing cost, still cannot achieve the desired results.
The purpose of the present invention is to overcome the shortcomings of the prior art, and to provide a preparation process of low-cost, simple processing method, reasonable process, stable and reliable product quality, high performance, low cost, long life aluminum alloy cylinder liner. The formula for preparing raw materials of the present invention is as follows: based on industrial alumina coarse powder, the content is 50-80 wt %, and the granules. The degree is between 2-10 microns, the fine powder of alumina after high temperature sintering and crushing is 5-20 wt %, and the particle size is 0.5-1.5 micrometers, 800-mesh zirconite powder 1-10 wt %, 800-mesh metal tungsten powder 0.2-2 wt %, 800-mesh talc powder 0.2-2 wt %, 800-mesh metal chromium powder 0.2-2 wt %, 800 mesh manganese 0.2-2 wt %, 800 mesh metal nickel powder 0.2-2 wt %, and 800 bentonite 0.2-2 wt %.
The raw materials weighed according to the formula are vacuum-dried and put into a high-speed rolling ball mill for 20-80 hours. The mill is sieved through 200 mesh, and then the sieved material and purified water are put into the stirring mill and stirred 1-4. Hours, add 0.5-2 wt % dispersant and binder at the same time, and then grind and defoam the slurry to prepare a stable slurry with a solid content of 60 70 wt %;
Dry and granulate the stable slurry into an average particle size of 100-200 mesh, fluidity of 30-40 seconds, bulk density of 1.0-1.8 g/cm3, and moisture content of 0.4-1 wt %. Grain powder
The granulated powder is cold isostatic pressed in a mold to make a tubular alloy blank, in which the forming pressure is 130 250 MPa, the holding time is 1-10 minutes, and the high temperature vacuum sintering of the alloy blank is performed. The temperature is 1500-1600 degrees, the heat preservation is 3-6 hours, the vacuum degree is controlled at −0.098 MPa. In one embodiment, the mold can be rubber. In another embodiment, the mold can be plastic. In another embodiment, the mold can be metal.
Process the outer circle and the two end faces of the alloy tube sintered at high temperature and vacuum, and place the processed alloy tube in a metal jacket that has been fully preheated and expanded;
Rough grinding and polishing the inner circle of the alloy tube to prepare a high-performance, low-cost, long-life aluminum-chromium alloy cylinder liner.
The interference between the processed alloy tube and the metal jacket is 0.10-0.70 mm, the assembly temperature between the alloy tube and the gold jacket is 300-600 degrees, and the holding time is 1-6 hours.
The preparation method of the invention is simple, the process is reasonable, the qualified rate of finished products is high, the production cost is greatly reduced, the quality of the prepared product is stable and reliable, and the service life of the product is greatly extended.
The present invention discloses a high-performance, low-cost, long-life aluminum-alloy alloy cylinder liner process, which is based on industrial alumina coarse powder, adding fine aluminum powder, aluminum stone powder, metal pigeon powder, which have been crushed by high temperature sintering, talc powder, metal powder, metal powder, metal baht powder, bentonite; the above raw materials are made into high-speed dry ball milling, wet stirring ball milling, spray drying to make alloy granulated powder, and then the alloy granulated powder is passed through cold, etc. Static pressure forming, high temperature vacuum sintering process into alloy tube, the outer circle and the two end faces of the alloy tube are processed, the processed alloy tube is placed in a metal jacket that has been fully preheated and expanded, and naturally cooled to room temperature to the alloy tube. Round rough grinding and polishing, so as to prepare high-performance low-cost long-life aluminum-chromium alloy cylinder liner. The preparation method of the invention is simple, the process is reasonable, the qualified rate of finished products is high, the raw material cost is low, the quality of the prepared product is stable and reliable, the service life of the product is greatly extended, and the average service life is not less than 2000 hours.
The present invention will be further described in detail in conjunction with the embodiment examples and the attached drawings 1 below. A preferred embodiment is as follows: weigh 65 wt % of industrial alumina coarse powder according to the formula, average particle size is 6 microns, alumina fine powder is 20 wt %, average particle size is 0.8 microns, 800 mesh zirconite powder 8 wt %, 800 mesh metal tungsten powder 1 wt %, 800 mesh talc 1.5 wt %, mesh metal chromium 1 wt %, 800 mesh metal manganese powder 1 wt %, 800 mesh metal nickel powder 1 wt %, and 800 bentonite 1.5 wt %.
The preparation method is as follows: The raw materials weighed according to the formula are vacuum dried and put into a high-speed rolling ball mill for 50 hours. The mill is sieved and filtered through 200 meshes. Agents and binders, aging and defoaming the slurry by milling to prepare a stable slurry with a solid content of 65 wt %; Dry and granulate the stable slurry into an average particle size of 200 mesh, a fluidity of 38 seconds, a bulk density of 1.4 g/cm3, and a moisture content of 0.7 wt % granulated powder; The granulated powder is cold isostatic pressed in a mold to form a tube-shaped alloy blank, in which the molding pressure is 180 MPa, holding time is 8 minutes, high temperature vacuum sintering of the alloy blank the sintering temperature is 1550 degrees, heat preservation for 4 hours, the vacuum degree is controlled at −0.098 MPa. The mold can also be plastic or metal. Process the outer circle and the two end faces of the alloy tube 2 that has been sintered at high temperature and vacuum, and place the processed alloy tube 2 into the metal jacket 1 that has been fully preheated and expanded. Then, rough grind and polish the inner circle of the alloy tube 2 to prepare a high-performance low-cost long-life aluminum complex alloy cylinder liner. The interference between the processed alloy tube 2 and the gold jacket 1 is 0.45 mm, the assembly temperature between the alloy tube 2 and the metal jacket 1 is 480 degrees, and the holding time is 4 hours. As prepared, the Rockwell Hardness (HRA) is 96. The Bending strength (MPa) is 609. The fracture toughness (MPa·Ml/2) is 6.5. The bulk density (g/cm3) is 4.3. The finish is 0.14 μm. Abrasion (laboratory) is 50 times higher than high-chromium cast iron. The preparation method of this embodiment is simple, the process is reasonable, the qualified rate of finished products is high, the production cost is greatly reduced, the quality of the prepared product is stable and reliable, and the service life of the product is greatly extended. The average service life is not less than 1,000 hours. Another preferred embodiment: Weigh 60 wt % of industrial aluminum coarse powder according to the formula, with an average particle size of 7 microns, alumina fine powder 15 wt %, the average particle size being 1 micron, 800 mesh zirconite powder 6 wt % 800 mesh metal tungsten 0.6 wt %, 800 mesh talc, powder 0.8%, 800 mesh metal chromium powder 0.8 wt %, 800 mesh metal manganese 0.9 wt %, 800 mesh metal nickel powder 0.9 wt %, 800 bentonite 1.2 wt %.
The preparation method is as follows: The raw materials weighed according to the formula are vacuum-baked and put into a high-speed rolling ball mill for 40 hours. Grind the sieve 200 mesh, then put the sieved material and purified water in the stirring mill and stir for 3 hours, add 1.5 wt % dispersant and binder at the same time, and then grind and defoam the slurry to prepare the solid content 60-70 wt % stable slurry; Dry and granulate the stable slurry into an average particle size of 150 mesh, a fluidity of 35 seconds, a bulk density of 1.0-1.8 g/cm3, and a moisture content of 0.4-1 wt %; the granulated powder is cold isostatic pressed in a rubber mold to make a tubular alloy hair, in which the molding pressure is 220 MPa, the holding time is 6 minutes, the alloy hair is also subjected to high temperature vacuum sintering, and the sintering temperature is 1600-Degree, heat preservation for 5 hours, vacuum degree controlled at 0.098 MPa; Process the outer circle and two end faces of the alloy tube 2 sintered at high temperature and vacuum, and place the processed alloy tube 2 into the metal jacket 1 that has been fully preheated and expanded; Rough grinding and polishing the inner circle of alloy tube 2 to prepare a high-performance, low-cost, long-life aluminum-chromium alloy cylinder liner. As prepared, the prepared product will have a Rockwell hardness (HRA) is 95, bending strength (MPa) is 608, the Fracture toughness (MPa·Ml/2) is 6.3, the bulk density (g/cm3) is 4.2, the finish is 0.15 μm, and abrasion (laboratory) is 50 times higher than high-chromium cast iron.
The interference star between the processed alloy tube 2 and the metal jacket 1 is 0.43 mm, the assembly temperature between the alloy tube 2 and the metal jacket 1 is 493 degrees, and the holding time is 5 hours.
The preparation method in this embodiment is simple, the process is reasonable, the qualified rate of finished products is low, the cost of raw materials is low, the quality of the prepared product is stable and reliable, the service life of the product is greatly extended, and the average service life is also not less than 2000 hours.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201910677170.6 | Jul 2019 | CN | national |
