A kind of slurry direct writing molding method of honeycomb diamond tool

A technology of diamond tools and direct writing molding, which is applied in manufacturing tools, ceramic molding machines, metal processing equipment, etc., can solve the problems of inability to completely wrap diamond powder, inability to maintain honeycomb structure, large changes in shape and size, etc., to achieve self-sharpening Good performance, avoid heat damage, remove debris

Active Publication Date: 2022-07-01
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the vitrified bond powder commonly used in the current slurry direct writing molding technology is based on SiO 2 As the main component, the shape and size change greatly after sintering and cannot maintain a good honeycomb structure
Moreover, these vitrified bond powder particles are micron-sized, and the powder particles are even larger than diamond abrasives, which cannot completely wrap diamond powder, and the bonding strength is low.

Method used

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  • A kind of slurry direct writing molding method of honeycomb diamond tool
  • A kind of slurry direct writing molding method of honeycomb diamond tool
  • A kind of slurry direct writing molding method of honeycomb diamond tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) mixing silicon powder, sodium oxide, aluminum oxide, potassium oxide and diboron trioxide in the weight parts shown in the following table 1 with a mixer at a rotating speed of 600r / min for 4h to obtain nano-ceramic powder;

[0032] Table 1

[0033]

[0034]

[0035] (2) fully dispersing polychitosan in deionized water (using a mixer to stir 90min at a rotating speed of 800r / min) to obtain a polychitosan solution with a concentration of 3wt%;

[0036] (3) Mixing the nano-ceramic powder obtained in step (1) with the polychitosan solution obtained in step (2) uniformly to obtain a slurry, the volume ratio of the mixed powder to the polychitosan solution is 69%:31% ;

[0037] (4) adding the slurry obtained in step (3) into the barrel of the slurry direct writing equipment, and printing the designed shape by layer-by-layer superposition to obtain a green body; the process parameters of the printing are: the printing speed of the needle head 4mm / min, the nozzle r...

Embodiment 2

[0042] (1) mixing silicon powder, sodium oxide, aluminum oxide, potassium oxide and diboron trioxide in the weight parts shown in the following table 3 with a mixer for 4h at a rotating speed of 600r / min to obtain nano-ceramic powder;

[0043] table 3

[0044] serial number Silicon powder sodium oxide Alumina Potassium oxide boron trioxide 1 65 6 12 3 11 2 63 6 12 3 11 3 61 6 12 3 11 4 59 6 12 3 11

[0045] Step (2) to step (5) are with embodiment 1, the performance of the diamond tool that the nano-ceramic powder of different formulas in table 3 makes is as shown in table 4 below:

[0046] Table 4

[0047] Numbering Dimensional change rate (%) Flexural strength (MPa) Compressive strength (MPa) 1 0.17 56.3 51.2 2 0.29 55.1 49.6 3 0.38 53.7 48.9 4 0.46 50.6 46.2

[0048] Combined with the data of Example 1, it is determined that the melting point of the nano-ceramic pow...

Embodiment 3

[0050] (1) mixing the nano-ceramic powder determined in Example 2 and the W10 diamond microparticles (10 μm) at a ratio of 75wt%: 25wt% at a rotating speed of 600r / min for 4h to obtain a mixed powder;

[0051] (2) fully dispersing polychitosan in deionized water (using a mixer to stir 90min at a rotating speed of 800r / min) to obtain a polychitosan solution with a concentration of 3wt%;

[0052] (3) Mixing the mixed powder obtained in step (1) and the polychitosan solution obtained in step (2) evenly to obtain a slurry, the volume percentages of the chitosan solution and the mixed powder are respectively 28%: 72% , 31%: 69% and 35: 65%;

[0053] (4) Add the slurry obtained in step (3) into the barrel of the slurry direct writing equipment, and print the designed shape by layer-by-layer (layer thickness 1mm) superimposition to obtain a blank; the printing process parameters It is: the needle printing speed is 4mm / s, the nozzle radius is 1.5mm, the shear rate is 10.6 / s, the flow...

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Abstract

The invention discloses a slurry direct writing method for a honeycomb diamond tool. The honeycomb diamond tool is a cylinder with a diameter of 80-150mm and a height of 50-120mm, and its upper and lower top surfaces are provided with several hexagonal honeycombs The side length of the hexagonal honeycomb through holes is 2-3mm, and the total area occupied by the hexagonal honeycomb through holes is 30-40% of the total area of ​​the top surface of the cylinder. The invention can prepare complex honeycomb structures that are difficult to form by traditional methods, and can adjust the printing size of honeycomb holes according to grinding requirements. These porous honeycomb structures can improve the space for chip storage and chip removal, effectively remove chips generated by grinding, and accelerate heat dissipation. , Good self-sharpening, avoid thermal damage caused by clogging.

Description

technical field [0001] The invention belongs to the technical field of abrasive materials, and in particular relates to a slurry direct writing method for honeycomb diamond tools. Background technique [0002] With the development of ultra-precision grinding technology, higher requirements are put forward for the processing efficiency and processing quality of grinding wheels. The porous structure vitrified bond diamond grinding wheel has the advantages of good self-sharpening, large chip removal space and small grinding force during use. Materials with high precision requirements have clear advantages. In the prior art, diamond tools are mainly prepared by hot pressing, while the traditional hot pressing method uses dry mixing to easily agglomerate, and artificial pressing of simple shapes cannot meet the requirements of high-quality grinding tracks. In addition, hot-pressing molding adds a pore-forming agent, and the pore-forming agent is completely decomposed during sin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B1/00B24D18/00B33Y10/00B33Y70/10
Inventor 陆静王艳辉黄景銮
Owner HUAQIAO UNIVERSITY
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