CZ525290A3 - 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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a 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.

BACKGROUND OF THE INVENTION

Current technology of steel machining with tools cast from high-performance high-speed steels requires increasing the performance of these tools while increasing their hardness and abrasion resistance and maintaining their required temperature resistance and toughness. 5%, which results in their lower hardness after heat treatment and also their lower resistance to tempering 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 deficiencies can be eliminated, even from the highly alloyed γ · Ji 'z, from the cutting and flossing of the cuttings / alloys with only the main alloying elements.

A ^{J 1} w & Jew j are tungsten, molybdenum, vanadium and cobalt 'f is that it contains 2,2 ¢ 2-2,8% carbon, 8 12% tungsten, 5 8% molybdenum, 7,5 10 % vanadium, 4 10% cobalt,

2a 8% chromium, 0.01 2 & 1% manganese, 0.01 ΓΓ 2% silicon, 0.01 0.5% nickel, and the rest of the alloy is iron.

The progress achieved by providing a high alloyed cutting alloy for the production of cast tools while retaining all of their desired properties is to provide a suitable combination of alloying elements to produce an alloy in which the non-reticulated MC carbides are largely deposited and have a total hardness of 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 progress is that the alloy exhibits a higher hardness compared to the known casting tool alloys,

Further progress is that the high alloyed cutting alloy according to the invention, with its chemical composition, belongs to a group of alloys which are processed by powder metallurgy.

An exemplary embodiment of the invention

Examples of high alloyed 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 alloy cutting alloy of the present invention exhibits a higher hardness of 68 HEc.

j / example

The high alloy cutting alloy has the following weight composition: 2.3% carbon, 9.65% tungsten, 6.72% molybdenum, 8.00% vanadium, 9.60% cobalt, 4.46% chromium, 0.27% manganese, 0.31% silicon,

0.01% nickel and the rest of the alloy is iron. The high alloy cutting alloy of the present invention exhibits a higher hardness of 67 HEc.

3. ^ example

The high alloyed cutting alloy has the following weight composition:

-32.5% 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 highly funceable cutting alloy of the present invention exhibits a higher hardness of 68 HRc.

4 »^ example

The high alloyed cutting alloy has the following weight composition: 2.7% carbon, 9% tungsten, 6.5% molybdenum, 8.7% vanadium, 7.6% cobalt, 5.8% chromium, 0.75% manganese, 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.

Claims (3)

PATENT REQUIREMENTS Ní ií. for the casting tools _f, in particular the alloying elements, characterized in that: 2.3% carbon, 3 Φ21 gray and are wo1iram that contains 2% tungsten, 113 OV3.Ci or molybdenum by weight 5 te 8% mo, whose main vanadium and cobalt are 2.2 θΖ of lybdenum, 7.5 ¢ / 10 vanadium, 4 2> Z 10% of cobalt, 3 3% of chromium, 0.01 2> 2% silicon, 0.01 2 and 0.5% nickel and iron. 0.01 or 1% of manganese, the rest of the alloy