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A method for preparing bearing balls based on electrostatic levitation technology
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An electrostatic suspension and bearing technology, applied in the field of bearing processing, can solve the problems of waste of materials, complicated procedures, and difficulty in processing small-sized bearing balls.
Active Publication Date: 2021-04-20
NORTHWESTERN POLYTECHNICAL UNIV
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[0008] In order to avoid the deficiencies of the prior art, the present invention proposes a method for preparing bearing balls based on electrostatic levitation technology. In view of the current bearing balls, there are complex processes from wire rods to ball embryos, molds of different sizes are required, waste materials, Problems such as difficulty in processing small-sized bearing balls
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Embodiment 1
[0031]Example 1: The prepared material is Fezr alloy with an electrostatic suspension method, a beaded ball bead having a diameter of 1.5 mm.
[0032](1) Cut: Depending on the diameter of the required bearing ball bead, take a diameter of 1.5 mm rod-shaped Fezr alloy as a ball, its density is 7.73 g / cm3The mass is 0.0142g, the total length of 1.04 mm is intercepted;
[0033](2) Suspension: Place the wire on the lower electrode, turn off the cavity valve, perform vacuum extraction, to reach 1.0 × 10-4At PA, a 15 kV voltage is applied between the upper and lower electrodes, and the sample is slippered and slightly shake, and 5 kV is applied around the sample, and the sample achieves stable suspension;
[0034](3) Melting: Turn on the heating laser, adjust the laser power at a rate of 7w / s to 60W, the sample is warmed at the rate of 120 k / s, after 15S, the sample is melted and overheating;
[0035](4) Sample Recycling: Turn off the laser, the sample is cooled at a rate of 60 k / s, and after...
Embodiment 2
[0036]Example 2: Preparation of titanium ball beads having a diameter of 3 mm using an electrostatic suspension method.
[0037](1) Cut: According to 3mm of the required bead ball bead, take a diameter of 2 mm rod-shaped high purity Ti as a ball material, which is 4.50 g / cm3, mass 0.0668g, an alloy wire having a length of 4.72 mm. ;
[0038](2) Suspension: Place the material prepared by step (1) on the lower electrode, turn off the cavity valve, perform vacuum extraction, to be vacuum to 5.0 × 10-4At PA, a 25 kV voltage is applied between the upper and lower electrodes, and the sample is slightly swayed, and 5 kV is applied around the side electrical order around the sample, and the sample achieves stable suspension;
[0039] (3) Melting: Turn the heating laser, adjust the laser power at a rate of 10 W / s to 80W, and the sample is warmed at a rate of 130 k / s, and after about 20s, the sample is melted and overheat;
[0040] (4) Sample Recycling: Turn off the laser, the sample is cooled ...
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Abstract
The invention relates to a method for preparing bearing balls based on electrostatic levitation technology. (1) Preparing initial metals or alloys: cutting wires according to material properties, or preparing initial metals or alloys by smelting according to the proportion of materials; (2) ) suspension: the initial metal or alloy obtained in step (1) is placed on the lower electrode in the cavity of the electrostatic levitation device, and a voltage is applied to the plate in a vacuum state to make the sample suspended stably; (3) melting: turn on the heating laser (4) Sample recovery: turn off the laser source, and after the temperature of the sample drops to room temperature, turn off the vacuum pump, open the cavity, and recover the sample. Through the scheme of the present invention for small-sized bearing balls from wire rods to ball embryos, the positive effects have the following aspects: the preparation process is simplified; no mold is required; materials are saved; wide adaptability, the electrostatic suspension method can be used for iron, Various metals such as titanium and tungsten and their alloys are prepared.
Description
Technical field[0001]The present invention belongs to the field of bearing processing, and involves a method of preparing a bead based on electrostatic suspension technique.Background technique[0002]Bearings are widely used as key components in daily life and industries, while the quality of the bearing ball beads directly determines the service life of the bearing, which is related to the operation efficiency of the equipment. The quality of the beads of the beads is closely correlated with its processing accuracy.[0003]Currently producing the process flow of the beads of the beads: stretch-cold pier - light ball - soft grinding - heat treatment - surface strengthening - hard mill - rough research - Jingchi - aging treatment - super comprehensive research, literature: Yang Jizhen, Wei Aiqing, Xu Xuemin High-speed high-precision number control machine bed bearing special steel ball production method: CN 103008994 A [P] .2013 .; Wang Zuoshan. Precision steel ball production method: C...
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