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Brazed diamond dressing tool

a diamond dressing and diamond dressing technology, applied in the direction of grinding devices, manufacturing tools, grinding devices, etc., can solve the problems of loss of exposed cutting edge, small geometric irregularities, dulling of abrasive tools as they are used,

Inactive Publication Date: 2005-11-24
SAINT GOBAIN ABRASIVES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As initially produced, such tools often exhibit slight geometric irregularities, especially at the surface, that define the operative cutting edge of the tool.
Also, abrasive tools routinely become dull as they are used.
It is also caused by a loss of exposed cutting edge as spaces between the abrasive particles are filled by abrasion debris.
If the dressing tool wears rapidly, it must be replaced with high frequency.
Dressing tools use costly materials such as diamond.
Hence, the fabrication of dressing tools is usually complicated and labor intensive, and dressing tools are relatively expensive.
Significant wear stems from deterioration of the bonding material that joins the diamond to the base of the dressing tool.
A major reason for deterioration is that the bonding material is itself worn away by contact with the work piece during dressing.
The mass of bonding material embedding diamond grains diminishes during service until an insufficient amount of material remains to retain those grains.
Another significant factor contributing to premature release of the diamond grains from the dressing tool is strength of the metal bond.
Weaker bonds will fail and release diamond grains under service conditions more quickly than stronger bonds, and thus weakly bonded tools will suffer from accelerated wear.
Diamond normally does not bond well to many metals and metal alloys that are desirable for brazed bond compositions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0055] This example describes a tool having a single pocket, illustrating the format described in FIGS. 2A and 2B. The tool was made by first machining a 10 mm square, 1 mm deep milled pocket in a steel bar measuring 2 mm×12.5 mm×38 mm. The pocket was filled with braze paste consisting of 15% by volume of an organic water based binder (Vitta Corp) and 70% by volume of powdered braze components. The braze components consisted of 70% by weight copper, 21% by weight tin and 9% by weight of titanium hydride, TiH2. The pocket was then filled with 20 / 25 mesh SDA 100+ diamond (DeBeers) by displacing the braze paste. The excess braze paste was removed by wiping, and then the resulting tool was dried in air at room temperature. The tool was then heated for 0.5 hours at 880° C. in a vacuum furnace at a pressure of 0.01-1 μm Hg, followed by cooling to room temperature. It was finished by grinding flat the exposed surface of the abrasive and removing the residual steel at the tool front.

example 2

[0056] The tool prepared in Example 1 was tested in dressing a K grade 80 grit 5SG grinding wheel. Its performance was compared with that of a commercially available dressing tool manufactured by the conventional method of placing diamonds in a powdered metal matrix in a mold and pressing and sintering or hot pressing the assembly to obtain a dense compact. The compaction movement inherent in a powder metal pressing operation often leads to the diamonds moving out of their plane. Two samples of the commercially available blade were utilized. The results of the comparative tests are presented in Table 1. In all cases the traverse rate was 11 in / min. “Wear Ratio” is the ratio of wheel volume removed per unit of tool length.

TABLE 1WheelBladeDepthVolumeHeightWearofChangeChangeRatioCut(cu. in.)(in.)(cu. in. / in.)(in.)Ex. 14630.06670360.002Comparative Tool B1Sample 11800.09718590.001Sample 21980.09920000.001

1Cincinnati CM336

[0057] These data in Table 1 illustrate that despite doubling t...

example 3

[0058] This example describes preparation and testing of a dressing tool having the format illustrated in FIG. 5B.

[0059] The tool preform was prepared with a structure of the type seen in FIG. 5A, however, in this example the tool had 9 rows of abrasive brazed into alleys machined into the steel preform (5 alleys exposed on one surface, 4 on the other). The alleys were filled with braze paste consisting of 15% by volume of an organic water based binder (Vitta Corp) and 70% by volume of powdered braze components. The braze powder consisted of 70% by weight copper, 21% by weight tin and 9% by weight of titanium hydride. The alleys were then filled with 20 / 25 mesh SDA 100+ diamond (DeBeers) by displacing the braze paste. The excess braze paste was removed by wiping, and then the tool was dried in air at room temperature. The tool was then heated for 0.5 hours at 880° C. in a vacuum furnace at a pressure of 0.01-1 μm Hg, followed by cooling to room temperature. The tool was finished by...

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Abstract

A dressing blade for finishing and reconditioning new and used abrasive grinding and cutting tools has a slab-shaped shank with an extension protruding longitudinally from the shank. Superabrasive grains are disposed on the surface of the extension and held in place by a brazed metal composition. This composition is formed by brazing a powdered mixture of brazing metal components and active metal components. Specific extension configurations are provided which allow aligning the superabrasive grains in single layer arrangement for precise dressing and simple fabrication of the tool. The novel dressing tool exhibits excellent wear characteristics.

Description

FIELD OF THE INVENTION [0001] This invention relates to a tool for dressing the abrasive portions of grinding or cutting tools. More specifically, it relates to a dressing tool having diamond grains affixed to a metal shank by a brazed metal composition. BACKGROUND OF THE INVENTION [0002] Dressing refers to an abrasive operation frequently used in fabricating new or reconditioning used abrasive tools, i.e., grinding or cutting tools. These tools typically have a structurally supportive core and an abrasive portion of discrete abrasive grains held to the core by a binding component. A grinding wheel is a common example of such a tool. As initially produced, such tools often exhibit slight geometric irregularities, especially at the surface, that define the operative cutting edge of the tool. Also, abrasive tools routinely become dull as they are used. Dullness results largely from retention by the binding component of worn abrasive particles exposed to repeated impact with the work p...

Claims

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Application Information

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IPC IPC(8): B22F3/00B23K35/30B24B21/18B24D3/06B24D3/10B24D18/00C22C26/00
CPCB24D18/00B24D3/06
Inventor ANDREWS, RICHARD M.BULJAN, SERGEJ-TOMISLAVGEARY, EARL G. JR.OWEN, ROBERT L.SKEEM, MARCUS R.
Owner SAINT GOBAIN ABRASIVES INC
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