Sandvik Ab

Sandvik Intellectual Property Ab

Sandvik Intellectual Property Aktiebolag

Marco Zwinkels

Gerold Weinl

Ulf Rolander

Anders Piirhonen

Per Gustafson

Anders Karlsson

Peter Björkhagen

Gunilla Anderson

Gedold Weinl

The present invention relates to a method of making cutting tools comprising a substrate having a hard phase and a binder phase, the method comprising forming green powder compacts using powder metallurgical techniques, charging the green powder compacts, placed on one or several trays, in a furnace and sintering the green powder compacts wherein the furnace comprises an insulation package, at least three individually controlled heating elements located inside the insulation package including a vertical heating element, an upper horizontal heating element arranged in an upper part of the furnace, and a lower horizontal heating element arranged in a lower part of the furnace, wherein operating the at least three heating elements such that an average controlled cooling rate from a sintering temperature down to at least a solidification temperature of the binder phase is 0.1-4.0&#xb0; C./min, and a sintering furnace operable to obtain a controlled cooling rate.

Sintering furnace and method of making cutting tools

A titanium based carbonitride alloy contains Ti, Nb, W, C, N and Co. The alloy also contains, in addition to Ti, Co with only impurity levels of Ni and Fe, 4-7 at % Nb, 3-8 at % W and has a C/(C+N) ratio of 0.50-0.75. The Co content is 9-&#x3c;12 at % for general finishing applications and 12-16% for semifinishing applications. The amount of undissolved Ti(C,N) cores must be kept between 26 and 37 vol % of the hard constituents, the balance being one or more complex carbonitrides containing Ti, Nb and W. The invented alloy is particularly useful for semifinishing of steel and cast iron.

Ti(C,N)-(Ti,Nb,W)(C,N)-Co alloy for finishing and semifinishing turning cutting tool applications

A titanium based carbonitride alloy containing Ti, Nb, W, C, N and Co. The alloy also contains, in addition to Ti, 9-14 at % Co with only impurity levels of Ni and Fe, 1-&#x3c;3 at % Nb, 3-8 at % W and has a C/(C+N) ratio of 0.50-0.75. The amount of undissolved Ti(C,N) cores should be kept between 26 and 37 vol % of the hard constituents, the balance being one or more complex carbonitrides containing Ti, Nb and W. The alloy is particularly useful for milling of steel.

Ti(C,N)-(Ti,Nb,W)(C,N)-co alloy for milling cutting tool applications

Ti(C,N)-(Ti,Nb,W)(C,N)-Co alloy for milling cutting tool applications

A titanium based carbonitride alloy contains Ti, Nb, W, C, N and Co. The alloy also contains, in addition to Ti, Co with only impurity levels of Ni and Fe, 4&#x2013;7 at % Nb, 3&#x2013;8 at % W and has a C/(C+N) ratio of 0.50&#x2013;0.75. The Co content is 9&#x2013;&#x3c;12 at % for general finishing applications and 12&#x2013;16% for semifinishing applications. The amount of undissolved Ti(C,N) cores must be kept between 26 and 37 vol % of the hard constituents, the balance being one or more complex carbonitrides containing Ti, Nb and W. The invented alloy is particularly useful for semifinishing of steel and cast iron.

The present invention relates to a sintered body of a carbonitride alloy with titanium as main component which has improved properties particularly when used as cutting tool material in general finishing cutting operations requiring high deformation resistance in combination with relatively high toughness. This has been achieved by combining a carbonitride based hard phase of specific chemical composition with an extremely solution hardened Co-based binder phase.

Ti(C,N)-(Ti,Ta,W)(C,N)-Co alloy for general finishing cutting tool applications

A sintered body of a carbonitride alloy with titanium as main component which has improved properties particularly when used as cutting tool material in light finishing cutting operations at high cutting speed. This has been achieved by combining a carbonitride based hard phase of specific chemical composition with an extremely solution hardened Co-based binder phase.

Ti(C,N)-(Ti,Ta,W)(C,N)-Co alloy for superfinishing cutting tool applications

The present invention relates to a sintered body of a carbonitride alloy with titanium as main component which has improved properties particularly when used as cutting tool material in cutting operations requiring high toughness. This has been achieved by combining a carbonitride based hard phase of specific chemical composition with an extremely solution hardened Co-based binder phase.

TI(C, N)&mdash;(TI, TA, W) (C, N)&mdash;CO alloy for toughness demanding cutting tool applications

The present invention relates to a method for manufacturing a sintered body of carbonitride alloy with titanium as the main component and cobalt as the binder phase and which does not have any compositional gradients or center porosity concentration after sintering. This is achieved by processing the material in a specific manner to obtain a lower melting point of the liquid phase in the interior of the body than in the surface while balancing the gas atmosphere outside the body with the alloy composition during all stages of the liquid phase sintering.

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Sundbyberg, Sweden

Marco Zwinkels