CZ278167B6 - High alloy for cutting tools - Google Patents

Abstract

High alloy for cutting tools for production of cast cutting and pressing tools whose main alloying elements are wolfram, molybdenum, vanadium and cobalt, contained in a mass ratio of 2.2 to 2.8 % carbon, 8 to 12 % wolfram, 5 to 8 % molybdenum, 7.5 to 10 % vanadium, 4 to 10 % cobalt, 3 to 8 % chromium, 0.01 to 1 9 % manganese, 0.1 to 2 % silicon, 0.01 to 0.5 % nickel and the remainder of the alloy is made of iron.

Description

Technical field

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-alloy cutting iron alloy for manufacturing. cast tools, especially cutting and pressing tools, the main alloying elements of which are tungsten, molybdenum, vanadium and cobalt.

BACKGROUND OF THE INVENTION

Current technology of steel machining using high-speed cast steel high-speed steels requires increasing the performance of these tools while increasing their hardness and abrasion resistance while maintaining their desired temperature resistance and toughness. High alloy steels with vanadium content up to 3.5% have so far been used in the production of cast tools, which results in their lower hardness after heat treatment and also their lower tempering resistance compared to other types of high alloy alloys. Another disadvantage of cast steels is carbide mesh, which has a negative effect on the toughness of these alloys and hence on the cutting ability of tools cast from these alloys.

SUMMARY OF THE INVENTION

The above-mentioned drawbacks can be overcome by a high alloy cutting alloy for the production of cast tools, in particular cutting and pressing tools, the main alloying elements of which are tungsten, molybdenum, vanadium and cobalt according to the invention. 8-12% tungsten, 5-8% molybdenum / 7.5-10% vanadium, 4-10% cobalt, 3-8% chromium, 0.01-1% manganese, 0.01-2% silicon, 0 0.01 to 0.5% nickel and the remainder of the alloy is iron.

The progress achieved by providing a high-alloyed cutting alloy for the production of cast tools while maintaining all of their desired properties is that by providing a suitable combination of alloying elements, an alloy is largely embedded in non-reticulated MC carbides and has a total hardness 3,000 HV. The alloy has high temperature stability and wear resistance and can be machined on conventional machine tools even at higher strength after soft annealing. Another improvement is that the alloy exhibits a higher hardness compared to the known casting tool alloys. Further, the high-alloy cutting alloy according to the invention, with its chemical composition, is classified as a group of alloys which are processed by powder metallurgy.

An exemplary embodiment of the invention

Examples of high-alloy cutting alloys according to the invention for cutting insert inserts include: 2.3% carbon, 9% tungsten, 6% molybdenum, 8% vanadium, 8% cobalt, 7% chromium, 0.5 % manganese, 0.5% silicon and 0.2% nickel, and the remainder of the alloy is iron.

The high-alloy cutting alloy is particularly suitable for cutting tools such as milling cutters, turning tools, cutting inserts, but also for dies and rock mining tools. The high alloyed cutting alloy of the present invention exhibits a higher hardness of 68 HRc.

2. Example

The high alloyed cutting alloy has the following composition: 2.3% carbon, 9.65% tungsten, 6.72% molybdenum, 8.00% vanadium, 9.60% cobalt, 4.46% chromium, 0.27% manganese , 0.31. % of silicon, 0.01% of nickel, and the rest of the alloy is iron. The high alloyed cutting alloy of the present invention exhibits a higher hardness of 67 HRc.

3. Example

The high alloy cutting alloy has the following composition: 2.5% carbon, 11% tungsten, 7% molybdenum, 9% vanadium, 9% cobalt, 6% chromium, 0.65% manganese, 0.8% silicon, 0.42 % nickel and the rest of the alloy is iron. The high alloy cutting alloy of the present invention exhibits a higher hardness of 68 HRc.

4. Example

High-alloy cutting alloy has. composition: 2.7% carbon, 9% tungsten, 6.5% molybdenum, 8.7% vanadium, 7.6% cobalt, 5.8% chromium, 0.75% manganese, 1.6% silicon 0.4% nickel and the rest of the alloy is iron. The high alloyed cutting alloy of the present invention exhibits a higher hardness of 69 HRc.

PATENT CLAIMS

Claims (1)

PATENT CLAIMS High-alloy cutting iron alloy for the production of cast tools, in particular cutting and pressing tools, the main alloying elements of which are tungsten, molybdenum, vanadium and cobalt, characterized in that it contains in mass, amounts of 2.2 to 2.8% carbon, 8 to 12 % tungsten, 5 to 8% molybdenum, 7.5 to 10% vanadium, 4 to 10% cobalt, 3 to 8% chromium, 0.01 to 1 manganese, 0.01 to 2% silicon, 0.01 to 0, 5% nickel and the rest of the alloy is iron.