SU1021586A1 - Metallic binding for making diamond tool - Google Patents

Abstract

1. METAL BOND FOR MANUFACTURING DIAMOND TOOLS containing cobalt, chromium carbide, copper and tin, differing from the fact that, in order to increase tool life during the processing of granite, the binder components are taken in the following ratio, wt.%: Carbide chromium 10–18 Copper 7–9 Tin 1–1 5 Cobalt Else 2. Linkage according to claim 1, characterized in that, in order to improve the strength and plasticity of the instrument, when processing granite with a high quartz content, it additionally contains iron and nickel at the following ratio of components, ve .%:. Chromium carbide 10-18 Copper- 7-9 Tin 1-1.5. Iron4-5 Nickel5-6 Cobalt: Else

Description

ate

00A The invention relates to the manufacture of diamond tools, in particular, to binder compositions for making diamond cutting discs for cutting granites. Known metal bond for the manufacture of diamond tools with the following ratio of components, wt.%: SGDS, 5-90 Cu3-70 Fe (Co, Ni) 2-30 Sn (2n, Cd, Al, PbJ 2-30 Known link with high content (40-90%) is used in the tool for cutting low-strength and highly abrasive rocks, such as gypsum, marble, limestone, sandstone, etc. G1 J. However, when cutting granites, the tool made on this link quickly it is salted at a high content (40-90%) and quickly and sewed at a low content (5-40%). This is due to the fact that the strength of the binder is insufficient High and the retention of diamond grains in it is weak, since the basis of the link is plastic metals (Cu, Zn, Sn, Pb, Cd) that do not wet the diamond. in the processing of granite and also increases the productivity and plasticity of the instrument in the processing of granite with a high content of quartz. The goal is achieved. - .. 10-18 Si7-9 Sn .1-1,5 CoE Really When working with granite with a high content of quartz, it additionally contains iron and nickel in the following ratio of components, wt.%: Cr – C, 10–18 Cu7–9 Sn1–1.5 Fe4–5 Ni5–6 Co. Else In this bond, cobalt provides high strength, shock to the bone of the tool and reliable retention of diamonds. Chromium carbide provides dispersion hardening of the base, increasing the hardness and wear resistance of the tool. But with an increase in the Cr Cz content of more than 18%, the toughness of the bond decreases to such an extent that the tool, for example, the segments of the cutting wheels, under conditions of dynamic loads during force cutting, begin to break. When the content of Ci Cj is less than 10% of the wear resistance of the tool is insufficient. Copper and tin form low-melting tin bronze, which is squeezed during hot pressing to the walls of the graphite mold, shields it (protects it from interaction with the npeccyeNSJM product {link). When the content of copper and tin is less than 8 and 1 wt.%, Respectively, it is impossible to guarantee reliable protection of the graphite mold from interaction with the extruded product at high temperature. With an increase in the copper and tin contents of more than 9 and 1.5 wt.%, Respectively, excessive outflows are observed. Iron increases bonding strength (from 90 kg / mm to 120 kg / l), nickel — plasticity} but with an increase in the content of Fe and Ni of more than 5 and 6%, respectively, the cutting wheels begin to work harder. Reliable retention of diamonds is achieved due to the durable adhesion of diamond grains with cobalt during heating than pressing at 1010-1050 ° C (weak adhesive adhesion below). Diamond-containing cutting elements, such as cutting wheel segments, are bonded by bonding metallurgy from powders of the original ingredients using hot pressing by bonding. The initial powders in the required ratio are mixed in a ball mill, dr on a barrel with steel balls 4-6 mm. Mixing time is 2 hours with the ratio of the weight of the charge to the weight of balls 1: 3 The prepared mixture is mixed with diamonds and pressed at 2 mc / cm into the workpiece segments. The pressing blanks are hot pressed in a graphite mold at 10101030 H2 and 300 kg / cm for 5 minutes. For the manufacture of diamond tools for cutting granite, we can recommend the following variants of the binder composition. Examples 1-3. Binding compositions, wt.% Cg C 1014 18 Cu 789 Sn 11.5 1 Co (base) 8276.5 72 Examples4, B. Composition of the bond, wt.%: Cg, C, 1810 Cu 8.87 Sn 1, 21 Ni 65 Co-J6272

The excilation properties of diamond cutting segment wheels on a bond are evaluated under the conditions of cutting low-strength, easily machined granite from the Vuoksinsky deposit and durable, difficult-to-work granite with a high content of quartz from the Yantsevo deposit. Tested in segment circles of 0 500 mm, equipped with diamonds of 500/400 grain nature at a concentration of 50%.

The tests were carried out on an upgraded 6M81G machine; wheel wear is measured with a bracket with a clock-type indicator. For comparison, circles on a known link were tested. The test results are shown in the table.

1-3 Granite of the Vuoksinsky gorodorozh- Until day 700-750

 Granite of the Yantsevskoye deposit (with a high content of quartz)

Famous Granite of the Vuoksinsky gorodorozh- Until the day 600-750

Granite of the Yantsevskoye deposit (with a high content of quartz)

The test results showed that the circles on. This bond has a higher cutting resistance.

cuts harder, sparks, not 2, 3-2,5 salives

Cuts harder.

2,3-2,5 Sparks, do not get dirty

Cuts hard

3,5-4,0 strongly sparks, salted

Up to 400-500

up to 5.0

granites in comparison with the circles on the D5 well-known bond, moreover, they work in the mode of sharpening.

Claims (3)

1. METAL BOND FOR THE PRODUCTION OF A DIAMOND TOOL, containing cobalt, chromium carbide, copper and tin, is distinguished by the fact that, in order to increase the tool life during processing of granite, the components of the bond are taken in the following ratio, wt.%: Chromium Carbide 10-18 Copper 7-9 Tin1-1 »5 Cobalt Else 2. A link on π. 1, characterized in that, in order to increase the strength and ductility of the tool when processing granite with a high quartz content, it additionally contains iron and nickel in the following, weight. * Carbide Copper Tin. Iron Nickel Cobalt Chrome Component Ratio 10-18 7-9 1-1.5 4-5 5-6 rest 00 A