Sharp type diamond drill bit for dry-drilling of granite
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A diamond drill and granite technology, applied in the field of powder metallurgy, can solve the problems of slow cutting speed and affecting processing efficiency, etc.
Inactive Publication Date: 2020-05-08
ZHEJIANG PROVINCE YONGKANG CITY JINDU IND & TRADE CO LTD
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[0004] In the prior art, most diamond drill bits, especially small-sized drill bits (including cobalt-based formulations) for dry drilling hard granite, especially for hard granite thicker than 50mm, have a common weakn
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Embodiment 1
[0015] A diamond drill bit, which uses ultrafine tungsten-copper alloy powder, copper-tin alloy powder, ultrafine iron powder, carbonyl nickel powder, phosphor copper powder, silver powder, and diamond as raw materials,
[0016] Among them, the superfine tungsten-copper alloy powder contains 70% tungsten and 30% copper by mass fraction, and the Fischer grain size is less than 2.5 μm; the copper-tin alloy powder contains 80% copper by mass fraction, contains 20% tin, and the Fischer grain size is less than 30 μm. The weight percentage of phosphorus in the phosphor bronze powder is 20%, and the Fischer particle size is less than 40 μm;
[0017] The weight percent composition of above raw material is:
[0018] Ultra-fine tungsten-copper alloy powder 30%-45%, copper-tin pre-alloy powder 25%-45%, ultra-fine iron powder 10%-20%, carbonyl nickel powder 5%-15%, phosphor copper powder 5%-10% , silver powder 1%-5%, the concentration of diamond is 15%-50% (according to 400%), and the pa...
Embodiment 2
[0034] Take 3kg of ultra-fine tungsten-copper alloy powder, 4kg of copper-tin alloy powder, 1kg of ultra-fine iron powder, 1kg of carbonyl nickel powder, 0.8kg of phosphor copper powder, and 0.2kg of silver powder, put them into the mixing tank, and mix them for 3 hours , then add 300g of 350-450μm diamond and continue mixing for 3 hours. Then add the mixed powder into granulating agent to make granules, and carry out drying treatment. Weigh a certain weight of the mixed powder and put it into the assembled compression mold cavity equipped with a cold compression mold. Pressing to obtain a cold-pressed blank, the pressing pressure is 50-150MPa. Then put the blank into a graphite mold and put it in a hot-press sintering furnace for sintering. At a sintering temperature of 880°C and a pressure of 35MP for a holding time of 8 minutes, after cooling and demoulding, a diamond cutter tooth is produced. The hardness of the cutter head is HRB95-100, and then ground arc treatment, and...
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Abstract
The invention relates to a sharp type diamond drill bit for dry-drilling of granite, and relates to the field of processing of hard and brittle stone materials. Ultrafine tungsten-copper alloy powder,copper-tin alloy powder, ultrafine iron powder, carbonyl nickel powder, phosphorus-copper powder, silver powder and diamond are adopted as raw materials of the drill bit. The drill bit is prepared from, by weight, 30-45% of ultrafine tungsten-copper alloy powder, 30-40% of carbonyl copper-tin prealloy powder, 10-20% of ultrafine iron powder, 10-25% of carbonyl nickel powder, 5-10% of phosphorus-copper powder and 1-5% of silver powder, the weight percentage of tin in the copper-tin prealloy powder is 20%, the weight percentage of phosphorus in the phosphorus-copper powder is 20%, the weight percentage of copper in the tungsten-copper prealloy powder is 30%, the concentration of the diamond is 15-50% (in preparation according to 400%), and the granularity is 300-550 [mu]m. Rapid and continuous dry-drilling machining can be performed on hard granite with the thickness larger than 50 mm through the diamond drill bit.
Description
technical field [0001] The invention belongs to the technical field of powder metallurgy, and relates to a sharp dry-drilling granite diamond drill bit. Background technique [0002] Granite is an igneous rock formed by the condensation of magma below the surface, and its main components are feldspar and quartz. Granite is a kind of rock with a very wide distribution. Granite is produced in many countries in the world; 9% of China's land (about 800,000 square kilometers) is granite rock mass. Granite is not easy to weather, has beautiful color, and its appearance and color can be maintained for more than a hundred years. Because of its high hardness and wear resistance, it is widely used in high-level architectural decoration projects, hall floors, and is also the first choice for outdoor carvings. However, granite is hard and dense, high in strength and wear-resistant, so it is very difficult to process. The present invention studies and adopts the diamond drill bit for t...
Claims
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