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Preparation method of hard alloy bar for PCB (Printed Circuit Board) micro drill

A cemented carbide rod and cemented carbide technology, which is applied in the field of preparation of cemented carbide rods for PCB micro-drilling, can solve the problems of large pore diameter variation, easy fracture of drill bits, poor hardness, strength, and wear resistance, etc. Less defects, enhanced wear resistance, good wear resistance

Inactive Publication Date: 2014-03-26
河南大地合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the PCB micro-drilling rods on the market are mainly made of ordinary cemented carbide materials through the traditional ultra-fine cemented carbide manufacturing process. The rods have many structural defects, which seriously affect the performance of the drill bit, hardness, strength, durability Poor wear causes the drill bit to break easily, the hole diameter changes greatly, and the hole wall finish does not meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) According to the total weight percentage, select 4% of Co powder, 0.5% of VC powder, and 1.2% of Cr3C2 powder with a Fibonacci particle size of 0.6um, and simultaneously add 0.006% of TiN powder and 0.02% of nano-Y2O3 powder, and the rest are Fibonacci powder To balance the 0.4um WC powder, add it to the stirring ball mill, then add 0.01% oleic acid and 1% polyethylene glycol to fully stir and mix;

[0021] (2) Choose a 1400ml agitating ball mill, add alcohol to the mixture as a grinding medium in a ratio of 400ml / kg to the mixture, add grinding balls according to the ratio of ball to material 5:1, and carry out stirring and grinding. The diameter of the grinding ball is D4, and the ball mill The stirring speed is 500rpm, the filling factor is 0.65, and the grinding is performed for 8 hours to form a slurry;

[0022] (3) Filtration and drying of the slurry, the mesh number of the filter screen for filtration is 20 mesh, the drying temperature is 50°C, and finally ma...

Embodiment 2

[0027] (1) According to the total weight percentage, select 8% of Co powder, 0.1% of VC powder, 0.2% of Cr3C2 powder, 0.01% of TiN powder and 0.06% of nano Y2O3 powder at the same time, and the rest are of Fisher’s particle size. To balance the 0.8um WC powder, add it to the stirring ball mill, then add 0.03% oleic acid and 3% polyethylene glycol to fully stir and mix;

[0028] (2) Select a 1400ml agitating ball mill, add alcohol to the mixture as a grinding medium at a ratio of 400ml / kg to the mixture, add grinding balls according to the ratio of balls to material 5:1, and carry out stirring and grinding. The diameter of the grinding ball is D4, and the ball mill is stirred The speed is 850rpm, the filling factor is 0.65, grind for 10 hours, and form a slurry;

[0029] (3) Filtration and drying of the slurry, the mesh number of the filter screen for filtration is 200 mesh, and the drying temperature is 50-250°C to make cemented carbide mixture particles;

[0030] (4) Molding...

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Abstract

The invention discloses a preparation method of a hard alloy bar for a PCB micro drill. The preparation method comprises the following steps: in terms of total weight percent, selecting 4-8% of Co powder, 0.1-0.5% of VC powder, 0.1-1.2% of Cr3C2 powder, 0.005-0.01% of TiN powder and 0.01-0.06% of Y2O3 powder with Fisher particle size of 0.6-1.0 micrometers, and the balance of WC powder with Fisher particle size of 0.3-0.8 micrometer, adding the selected powder into a ball mill, further adding 0.01-0.03% of oleic acid and 1-3% of polyethylene glycol, sufficiently stirring and mixing; adding alcohol according to the proportion of 400ml / kg, further adding mill balls for milling, filtering and drying pulp stock, and then, molding by virtue of mould pressing or extrusion or injection molding, and molding a hard alloy blank by sintering. A PCB micro drill made of the bar prepared by the preparation method is particularly suitable for tools for processing PCB through holes or blind holes with diameter of less than 0.3mm, has less structure defects, high strength, high hardness and good abrasive resistance.

Description

technical field [0001] The invention relates to the technical field of production of rods for PCB micro-drills, in particular to a method for preparing hard alloy rods for PCB micro-drills. Background technique [0002] Due to the increasing intelligence and miniaturization of modern electrical appliances, the need for thinner wires and narrow spacing, the printed circuit board manufacturing technology is developing rapidly, and the corresponding requirements for the PCB micro-drilling material performance of the printed circuit board PCB hole Higher strength, hardness, and wear resistance are developed. [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 harder and harder. Due to the influence of man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C29/02
Inventor 刘少峰佘文彬
Owner 河南大地合金有限公司
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