초록 ▼

A heat transfer regulating mixture having a metallic component A with a melting point TAand a particulate ceramic component B which is non-wettable by the metallic component A, non-reactive therewith and which has a melting temperature TBwhich is higher than both the temperature TAand a desired oper

A heat transfer regulating mixture having a metallic component A with a melting point TAand a particulate ceramic component B which is non-wettable by the metallic component A, non-reactive therewith and which has a melting temperature TBwhich is higher than both the temperature TAand a desired operating temperature TDwhich is also higher than TA. The metallic component A and the particulate ceramic component B and the respective amounts will typically be selected to have a higher thermal resistivity above TAthan below TA. The heat transfer regulating mixture may be incorporated in the heat transfer regulating device having the mixture within an enclosure having first and second contact faces.

대표청구항 ▼

A heat transfer regulating mixture having a metallic component A with a melting point TAand a particulate ceramic component B which is non-wettable by the metallic component A, non-reactive therewith and which has a melting temperature TBwhich is higher than both the temperature TAand a desired oper

A heat transfer regulating mixture having a metallic component A with a melting point TAand a particulate ceramic component B which is non-wettable by the metallic component A, non-reactive therewith and which has a melting temperature TBwhich is higher than both the temperature TAand a desired operating temperature TDwhich is also higher than TA. The metallic component A and the particulate ceramic component B and the respective amounts will typically be selected to have a higher thermal resistivity above TAthan below TA. The heat transfer regulating mixture may be incorporated in the heat transfer regulating device having the mixture within an enclosure having first and second contact faces. t the intersection of the minor side surfaces with the bottom surface, each minor cutting edge being connected to an adjacent major cutting edge; wherein each minor cutting edge forms an external obtuse angle (α) with its adjacent major cutting edge, in a top or bottom view of the cutting insert. 2. The cutting insert according to claim 1, wherein the minor cutting edges are shorter than the major cutting edges. 3. The cutting insert according to claim 1, wherein each side surface has a varying height dimension (H). 4. The cutting insert according to claim 3, wherein the height dimension (H) has a minimum value (Hmin) in a central region of the side surface. 5. The cutting insert according to claim 4, wherein the height dimension (H) decreases monotonically from a maximum value (Hmax) at an outer region of the side surface to the minimum value (Hmin) at the central region. 6. The cutting insert according to claim 1, wherein the top and bottom surfaces are provided with a chip groove adjacent and extending longitudinally along the major and minor cutting edges. 7. The cutting insert according to claim 1, wherein the top surface is provided with a top abutment surface generally centrally located with respect to the major cutting edges and the bottom surface is provided with a bottom abutment surface generally centrally located with respect to the major cutting edges and generally facing away from the top abutment surface. 8. The cutting insert according to claim 7, wherein the top and bottom abutment surfaces are flat and parallel to each other and separated by a given distance. 9. The cutting insert according to claim 8, wherein the given distance between the top and bottom abutment surfaces is at least equal to the maximum value (Hmax) of the height dimension (H) of the side surfaces. 10. The cutting insert according to claim 6, wherein the cutting insert is provided with a land extending from the major and minor cutting edges towards the chip groove. 11. A milling cutter comprising a tool body having the general form of a circular disk and a plurality of identical cutting inserts releasably mounted in insert pockets; the tool body having two oppositely facing generally circular side faces connected by a peripheral mounting face, an axis of rotation (A) passing through the side faces, the axis of rotation (A) defining a direction of rotation (R) of the milling cutter; the insert pockets being spaced angularly around the peripheral mounting face; the cutting inserts comprising: generally square shaped top and bottom surfaces; four substantially identical side surfaces extending between the top surface and the bottom surface; two diametrically opposite protuberances extending away from each other in a top or bottom view of the cutting insert, each protuberance having a peripheral side surface comprising and intermediate side surface and two minor side surfaces, the intermediate side surface being located between and merging with the two minor side surfaces, each side surface comprising a major side surface connected to an adjacent minor side surface, adjacent major side surfaces merging at two diametrically opposite corner edges of the cutting insert; eight identical major cutting edges, formed at the intersection of the major side surfaces with the top and bottom surfaces; and eight identical minor cutting edges, formed at the intersection of the minor side surfaces with the top and bottom surfaces, each minor cutting edge being connected to an adjacent major cutting edge; wherein each minor cutting edge forms an external obtuse angle (α) with its adjacent major cutting edge, in a top or bottom view of the cutting insert; the cutting inserts being arranged in a staggered formation in pairs with one of the top or bottom abutment surfaces of each cutting insert facing in the direction of rotation (R), a first cutting insert of a given pair of cutting inserts having a