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Rock Drill Bits,DTH Drill Bits ([info]gabrielbro) wrote,
@ 2021-02-19 11:56:00

Previous Entry  Add to memories!  Tell a Friend!  Next Entry
Method for preparing hard alloy bar for PCB micro drill
Method for preparing hard alloy bar for PCB micro drill

[Patent Description] A method for preparing hard alloy rods for PCB micro-drills
Technical Field
[0001] The present invention relates to the production of PCB micro-drill rods [Technical Field], and specifically to a method for preparing hard alloy rods for PCB micro-drills.
[Background Art] [0002] As modern electrical appliances are becoming smarter and smaller in size, and demand for thinner wires and narrower pitches, printed circuit board manufacturing technology is developing rapidly, and the corresponding requirements for processing printed circuit board PCB holes The performance of PCB micro-drill material is developing towards higher strength, hardness and wear resistance.
[0003] At present, PCB micro-drills are mainly made of ultra-fine cemented carbide rods. Ultra-fine cemented carbide is a material with relatively good hardness, strength and wear resistance, and has been more widely used in modern industry..As the material of the PCB board is upgraded faster and faster, the material becomes more and more rigid. Due to the existence of many solid materials in the material, the low thermal conductivity of the material, and the higher and higher processing speed, the processing process will More and more heat is generated, which accelerates the wear of PCB micro-drills. Correspondingly, ultra-fine cemented carbide rods are required to have higher hardness, higher strength and higher wear resistance..
[0004] The PCB micro-drill rods currently on the market are mainly made of ordinary cemented carbide materials through the traditional ultrafine cemented carbide manufacturing process. There are many structural defects in the rods, which seriously affect the performance, hardness, and hardness of the drill bit. Poor strength and wear resistance, resulting in easy breakage of the drill bit, large hole diameter change, and hole wall finish that does not meet the requirements.

[Content of the invention]

[0005] The purpose of the present invention is to provide a method for preparing PCB micro-drills with cemented carbide rods. The PCB micro-drills processed from the rods made by the materials and methods are particularly suitable for processing diameters less than 0.3mm PCB panel through hole or blind hole tool to solve the defects of many bar defects, easy to break, and fast wear under the existing technology.
[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:
A preparation method of hard alloy rods for PCB micro-drills, the process steps of the preparation method are:
(1) Based on the total weight percentage, select the Fisher particle size as 0.6~1.0um Co powder 4~8%, VC powder 0.1~
0.5%, Cr3C2 powder 0.1 ~1.2%, TiN powder 0.005 ~0.01%, Y203 powder 0.01 ~0.06%, the rest is Fibonacci particle size 0.3~0.Add 8um WC powder to the stirring ball mill, and then add oleic acid.01~0.03%, polyethylene glycol 1~3%, fully stir and mix;
(2) Add alcohol according to the ratio of 400ml/kg as the grinding medium, add the grinding ball according to the ball ratio of 5:1, stir and grind, the diameter of the grinding ball is D4, the stirring speed of the ball mill is 500~850rpm, and the filling factor is 0.65. Grind for 6-10 hours to form slurry;
(3) Material: filter and dry, the mesh size of the filter sieve is 20~200, and the drying temperature is 50~250C, to make cemented carbide mixture pellets;
(4) The cemented carbide mixture pellets are molded by compression or extrusion or injection molding to make ultrafine cemented tungsten carbide plates for PCB micro-drills, and sintered; the sintering temperature during molding is 1360~1450C, Ar pressure 8~lOMpa, holding time 30~150min;
(5) Baking inspection, packaging and warehousing.[0007] As an improvement to the above technical solution, the added amount of the VC powder is 0.3%.
[0008] As an improvement to the above technical solution, the addition amount of the Cr3C2 powder is 0.8%.
[0009] As an improvement to the above technical solution, the amount of TiN powder added is 0.008%.
[0010] As an improvement to the above technical solution, the added amount of the Y203 powder is 0.04%.
[0011] Compared with the prior art, the beneficial effects of the present invention are: the present invention adds VC and Cr3C2 as crystal material inhibitors to the raw materials to ensure the refinement of the crystal material of the alloy structure. TiN and Y203 are added simultaneously during mixing, Effectively enhance the wear resistance of the bar made.PCB micro-drills made by using the bar made by this preparation method are especially suitable for processing diameters smaller than
0.3mm PCB panel through hole or blind hole cutter, less structure defect, high strength, high hardness, good wear resistance.

Detailed ways

[0012] The present invention will be further described in detail below in conjunction with specific examples and implementations thereof.
[0013] Example one:
(1) Based on the total weight percentage, select the Fisher particle size as 0.6um Co powder 4%, VC powder 0.5%, Cr3C2 powder 1.2%, adding TiN powder simultaneously 0.006%, nano Y203 powder 0.02%, the rest is Fischer particle size 0.4um WC powder balance, add to the stirring ball mill, then add oleic acid 0.01%, polyethylene glycol 1% for thorough mixing;
(2) Choose a 1400ml stirring ball mill, add alcohol to the mixture at the ratio of 400ml/kg to the mixture as the grinding medium, add the grinding balls according to the ball ratio of 5:1, stir and grind, the diameter of the grinding ball is D4, the ball mill Stirring speed 500rpm, filling factor is 0.65. Grind for 8 hours to form a mass; (3) Filter and dry the mass. The mesh size of the filter sieve for filtration is 20 meshes, and the drying temperature is 50C. Finally, cemented carbide mixture particles are made;
(4) The cemented carbide mixture pellets obtained in the previous step are molded, extruded, or injection molded to form a diameter
1.3_, length 40_ of the bar, which is the superfine cemented carbide blank for PCB micro-drilling, enters the sintering furnace for sintering molding; the sintering temperature during sintering molding is 1450C, the Ar pressure is 8Mpa, and the holding time is 60min ;
(5) Out-of-fire inspection, packaging and storage;
(6) After processing, the diameter is 0.3mm PCB micro-drills, the PCB micro-drills have a service life of 3000 holes in a single trimming, and the hole walls are smooth and qualified. In the same period, the commercial micro-drills can process an average of 2500 holes in a single trim, and the service life reaches 1.2 times.
[0014] The second embodiment:
(1) Based on the total weight percentage, select the Fisher particle size as 1.0um Co powder 8%, VC powder 0.l%, Cr3C2 powder 0.2%, adding TiN powder simultaneously 0.01%, nano Y203 powder 0.06%, the rest is Fischer particle size 0.8um WC powder balance, add it to the stirring ball mill, then add oleic acid 0.03% and 3% polyethylene glycol are fully stirred and mixed;
(2) Choose a 1400ml stirring ball mill, add alcohol to the mixture at a ratio of 400ml/kg to the mixture as the grinding medium, add the grinding balls according to the ball ratio of 5:1, stir and grind, the diameter of the grinding ball is D4, and the ball mill stirs Speed 850rpm, filling factor is 0.65. Grind for 10 hours to form a mass;
(3) The material is filtered and dried. The mesh size of the filter sieve used for filtering is 200 meshes, and the drying temperature is 50~250C to make cemented carbide mixture pellets;
(4) The cemented carbide mixture pellets obtained in the previous step are molded, extruded, or injection molded to form a diameter
1.3mm, 40mm length of the bar, which is the ultrafine cemented carbide blank for PCB micro-drilling, enters the sintering furnace for sintering; the sintering temperature during forming is 1360C, the Ar pressure is 10Mpa, and the holding time is 150min;
(5) Out of the furnace inspection, packaging and storage; (6) After processing, the diameter is 0.3mm PCB micro-drills, the PCB micro-drills have a service life of 3100 holes processed by a single trimming, and the hole wall is smooth and qualified. In the same period, the commercial micro-drills processed an average of 2500 holes in a single trimming, and the service life reached 1.2 times.
[0015] The foregoing descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in Within the protection scope of the present invention.

Rights request

1.A method for preparing hard alloy rods for PCB micro-drills, characterized in that: the process steps of the preparation method are: Cl) In terms of total weight percentage, the Fischer particle size is selected as 0.6~1.0um Co powder 4~8%, VC powder 0.1~0.5%, Cr3C2 powder 0.1 ~1.2%, TiN powder 0.005 ~0.01%, Y2O3 powder 0.01 ~0.06%, the rest is Fibonacci particle size 0.3~0.Add 8um WC powder to the stirring ball mill, and then add oleic acid.01~0.03%, polyethylene glycol 1~3%, fully agitate and mix; (2) Add alcohol at the ratio of 400ml/kg as the grinding medium, add the grinding ball according to the ball material ratio of 5:1, and stir and grind. The diameter of the grinding ball is D4 , The stirring speed of the ball mill is 500~850rpm, and the filling factor is 0.65. Grind for 6~10 hours to form a slurry; (3) Material: filter and dry, the mesh size of the filter screen is 20~200, the drying temperature is 50~250C, and it is made into cemented carbide mixture granules (4) The cemented carbide mixture pellets are molded by compression or extrusion or injection molding to produce ultra-fine PCB micro-drillsTungsten Carbide Burr BlankCemented carbide blanks, sintered and formed; the sintering temperature during forming is 1360~1450C, the Ar pressure is 8~10Mpa, and the holding time is 30~150min; (5) Out of furnace inspection, packaging and warehousing.
2.The preparation method according to claim 1, characterized in that: the added amount of the VC powder is 0.3%.
3.The preparation method according to claim 1, characterized in that: the added amount of the Cr3C2 powder is 0.8%.
4.The preparation method according to claim 1 or 2 or 3, characterized in that: the added amount of TiN powder is 0.008%.
5.The preparation method according to claim 4, characterized in that: the added amount of the Y2O3 powder is 0.04%.


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