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CN-115741504-B - High-precision and high-efficiency grinding titanium alloy ceramic grinding wheel and preparation method thereof

CN115741504BCN 115741504 BCN115741504 BCN 115741504BCN-115741504-B

Abstract

The invention discloses a high-precision and high-efficiency grinding titanium alloy ceramic grinding wheel and a preparation method thereof, wherein the grinding wheel comprises a coarse grinding wheel and a fine grinding wheel, the coarse grinding wheel and the fine grinding wheel are respectively made of green silicon carbide and ceramic bond, the coarse grinding wheel comprises, by weight, 82-90% of green silicon carbide, 10-18% of ceramic bond, 25-30% of ceramic bond, 35-40% of feldspar, 25-30% of borosilicate glass, 0.5-1% of lithium carbonate, 2.5-5% of talcum powder, 1.5-2.8% of bentonite, 2-4.5% of dextrin powder, the fine grinding wheel comprises, by weight, 88-92% of green silicon carbide, 8-12% of ceramic bond, the ceramic bond comprises, 23-35% of clay, 29-46% of feldspar, 21-32% of borosilicate glass, 2-3% of talcum powder, 0.3-0.6% of lithium carbonate, 1.5-2.4% of dextrin powder and 1.2-1.8% of bentonite.

Inventors

  • WANG PENGJIAN
  • ZHANG LIN
  • ZHANG GUOWEI
  • REN PENGFEI
  • LI PENGPENG

Assignees

  • 白鸽磨料磨具有限公司

Dates

Publication Date
20260508
Application Date
20221130

Claims (7)

  1. 1. The ceramic grinding wheel is characterized by comprising a coarse grinding wheel and a fine grinding wheel, wherein the coarse grinding wheel and the fine grinding wheel are both made of green silicon carbide and ceramic bond, the coarse grinding wheel comprises 82-90 wt% of green silicon carbide, 10-18 wt% of ceramic bond, the fine grinding wheel comprises 88-92 wt% of green silicon carbide and 8-12 wt% of ceramic bond, The ceramic bond in the rough grinding wheel consists of, by mass, 25-30% of clay, 35-40% of feldspar, 25-30% of borosilicate glass, 0.5-1% of lithium carbonate, 2.5-5% of talcum powder, 1.5-2.8% of bentonite and 2-4.5% of dextrin powder, and the ceramic bond in the fine grinding wheel consists of, by mass, 23-35% of clay, 29-46% of feldspar, 21-32% of borosilicate glass, 2-3% of talcum powder, 0.3-0.6% of lithium carbonate, 1.5-2.4% of dextrin powder and 1.2-1.8% of bentonite; the granularity of the green silicon carbide in the rough grinding wheel is F100-F320, and the granularity of the green silicon carbide in the fine grinding wheel is F400-F1000.
  2. 2. The method for preparing the ceramic grinding wheel for high-precision and high-efficiency grinding of the titanium alloy according to claim 1, which is characterized by comprising the following steps: (1) Adding clay, feldspar, borosilicate glass, lithium carbonate, dextrin powder, talcum powder and bentonite, and uniformly mixing to obtain a bonding agent; (2) Pouring green silicon carbide into a pot, adding paste liquid accounting for 1.8-2.5% of the total weight of the green silicon carbide and a bonding agent, stirring for 10-15 min, adding a prepared ceramic bonding agent, and stirring for 10-15 min to obtain a molding material of the coarse grinding wheel; (3) Pouring the mixed materials into a prepared mould, uniformly stirring, scraping, pressing, forming and drying to obtain a grinding wheel blank; (4) And (3) placing the raw grinding wheel into a high-temperature kiln, and sintering for 4-8 hours at 1030-1070 ℃, wherein the hardness range M-P of the raw grinding wheel and the hardness range K-M of the fine grinding wheel are the same, and thus the corresponding grinding wheel can be prepared.
  3. 3. The method for preparing the ceramic grinding wheel for high-precision and high-efficiency grinding of the titanium alloy according to claim 2, wherein the pressing and forming in the step (3) means pressing for 2-3 times under the same pressure of 13-20 MPa and the same dwell time of 5-30 s.
  4. 4. The method for preparing the ceramic grinding wheel for high-precision and high-efficiency grinding of the titanium alloy, which is characterized in that the drying in the step (3) is performed at 60-80 ℃ for 12-24 hours.
  5. 5. The method for preparing the ceramic grinding wheel for high-precision and high-efficiency grinding of the titanium alloy, which is characterized in that the concentration of the paste liquid in the step (2) is 40-60wt%.
  6. 6. The method for preparing the ceramic grinding wheel for high-precision and high-efficiency grinding of the titanium alloy, which is characterized in that the temperature rising rate of 1-5 ℃ per minute is adopted in the step (4) to be raised to 1030-1070 ℃.
  7. 7. The use of the ceramic grinding wheel according to claim 1 in grinding titanium alloy, wherein after 50% -80% of the grinding allowance is removed from the surface of the workpiece by using a rough grinding wheel, the workpiece is finely ground by using a fine grinding wheel, 15% -35% of the grinding allowance is removed, and finally the rest grinding allowance is removed by polishing.

Description

High-precision and high-efficiency grinding titanium alloy ceramic grinding wheel and preparation method thereof Technical Field The invention belongs to the field of grinding, and particularly relates to a high-precision and high-efficiency grinding titanium alloy ceramic grinding wheel and a preparation method thereof. Background The TC4 titanium alloy is a titanium-containing alloy metal with the composition of Ti-6Al-4V, and has the characteristics of low density, high strength, corrosion resistance and the like. Ceramic grinding wheel, which is a grinding tool made by using ceramic binder to adhere abrasive particles together. TC4 titanium alloy is a difficult-to-grind metal, has the characteristics of low strength, low density, corrosion resistance and the like, and is widely applied to the fields of aerospace, shipbuilding and the like, such as blades of an airplane, pressure-resistant shells of ships and the like. In recent years, with the gradual maturity of the TC4 titanium alloy preparation process and the characteristics of high strength and low density of the titanium alloy, the titanium alloy has been gradually applied to the 3C field, such as a smart phone outer frame, a watch case and the like. Because of the high strength of titanium alloys, CBN grinding wheels are typically used for grinding. During grinding, titanium scraps are easy to adhere to the surface of the CBN grinding wheel, so that the grinding wheel is blocked, the CBN grinding wheel is high in hardness, difficult to repair, low in grinding efficiency and high in price, the processing mode of grinding TC4 titanium alloy by adopting the CBN grinding wheel in the current market is less, the price of a ground product is high, and the surface quality of a workpiece is poor. The ceramic grinding wheel is low in price and easy to repair, but the grinding of the TC4 titanium alloy still has a plurality of problems, so that the ceramic grinding wheel for high-precision and high-efficiency grinding of the TC4 titanium alloy is always sought in the market. At present, the TC4 titanium alloy workpiece is very rarely applied in the field of high-end consumer electronics due to the difficult-to-grind characteristic. The consumer electronic products have high updating speed and high market demand, so that the requirements on the surface quality, the precision and the processing efficiency of the selected metal shell are very high. The CBN grinding wheel is high in hardness and wear resistance, and is often used for grinding TC4 titanium alloy, but the ground surface scratches are deep, and because the TC4 titanium alloy is hard, scratches are easy to appear on the surface of a workpiece, and the scratches are difficult to eliminate in the next working procedure. During grinding, titanium scraps are easily attached to the surface of the grinding wheel, so that secondary damage to the surface of a workpiece is caused, and the grinding wheel needs to be frequently dressed. CBN grinding wheels are expensive, difficult to repair, often require return to manufacturers for processing, are cumbersome to operate, have high cost, and are not suitable for large-scale production of high-end electronic consumer products. In addition, people use common grinding wheel ceramic grinding wheels to grind, so that the grinding wheel consumption speed is high, the grinding wheel consumption speed is higher than the grinding amount of the workpiece, the use speed is lower, the number of scratches on the surface of the ground workpiece is only 10-15 m/s, and the grinding wheel ceramic grinding wheel is also not suitable for mass production of high-end electronic consumer products. Disclosure of Invention Aiming at the characteristics of difficult grinding, easy chip sticking and the like of TC4 titanium alloy, the invention provides a ceramic grinding wheel for high-precision and high-efficiency grinding of titanium alloy and a preparation method thereof. When the grinding wheel is used for grinding titanium alloy, the grinding wheel has the advantages of sharp grinding, long service life, high durability and the like, and the surface of the ground workpiece has bright color and luster and mirror-like effect. When the grinding wheel with 2 different granularities is used for grinding titanium alloy, especially TC4 titanium alloy, firstly, a coarse-granularity ceramic grinding wheel is used for removing most grinding allowance of a workpiece, and then, a fine-granularity ceramic grinding wheel is used for fine grinding and polishing, so that the desired workpiece surface effect can be obtained through the combination of different granularities. Based on the above purpose, the invention adopts the following technical scheme: The ceramic grinding wheel comprises a coarse grinding wheel and a fine grinding wheel, wherein the grinding wheel is made of green silicon carbide (GC) material, the granularity is from F100 to F1000, the coarse grinding wheel and the fine grin