Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Rolling or rotatable bit
Patent
1996-08-16
1997-12-30
Bagnell, David J.
Mining or in situ disintegration of hard material
Cutter tooth or tooth head
Rolling or rotatable bit
299113, F21C 35183
Patent
active
057021600
DESCRIPTION:
BRIEF SUMMARY
The invention relates to the mining industry, more specifically to a cutting tool for mining and construction machines, and can be used in breaking rock and artificial materials, say, roadway coverings.
Known in the art is a rock breaking tool for the mining machines, which comprises a housing and a hard-alloy insert mounted on the housing, said insert having a work portion of conic shape and a shank tapering towards the end of the insert and intended for arrangement in the nest of said housing of the tool (cf. USSR Inventor's Certificate No. 1245696, cl. E21C 25/38, published 1986) (1).
Known from (1) is a tool for breaking a hard material displaying sufficient strength and durability, which provide the sufficient operating life thereof in operating conditions, on crushing hard materials. However, the geometric form of the work portion of the insert is not optimal as to consumption of hard-alloy material that goes for its manufacture. Inasmuch as for making an insert, use is made usually of a metal ceramics hard-alloy of a tungsten-cobalt group, then of substantive importance is a task of reducing the consumption of hard-alloy materials (scarce tungsten) for manufacturing the insert and, hence, of effecting a cost saving in the manufacture of the tool upon the whole. The hard-alloy insert with a work portion of conic shape calls for its manufacture a considerable amount of a material in short supply, a factor that entails a considerable rise in the cost of manufacturing the tool.
Closest as to technical essence and attainable result is a tool for breaking hard material, which comprises a housing and a hard-alloy insert mounted on the housing and having a head portion, a base with a thrust face for cooperation with a supporting surface of the housing and an intermediate portion disposed between the head portion and the base and formed by a body of revolution with an external lateral surface of concave shape (cf. FRG Application No. 3317441, cl. B28D I/28, published 1984)(2).
The structural peculiarities of a known tool for crushing hard material allow one to improve efficiency of a process of breaking the hard material by reducing a cutting force by choosing the rational geometric characteristics of the work portion of an insert and, so, to reduce the consumption of a hard-alloy going for the manufacture of the insert, i.e., effect a cost saving in manufacturing the tool. However, the tool known from (2) of the type used for breaking the hard material exhibits no sufficiently high lasting quality, since optimization of the geometric shape of the work portion of said insert as to the amount of said hard-alloy usable for its production does not contribute to required strength and wear resistance of the hard-alloy insert and, consequently, the lasting quality of the tool is reduced as a whole, in other words, the operating life of the tool with the hard-alloy insert of said type is not high enough.
It is the task of the invention to create a tool for breaking hard material which would have a sufficiently high durability and at the same time would make for a reduction of the cost of manufacturing the tool.
The task set is solved owing to the fact that in the tool for breaking hard material, comprising a housing and a hard-alloy insert mounted on the housing and provided with a head portion, a base with a thrust face for interaction with the supporting surface of the housing and an intermediate portion disposed between said head portion and said base and formed by a body of revolution with an external lateral surface of concave shape, the head portion of the insert is formed by a body of revolution with an external lateral surface of convex shape, and the lateral side of the head portion of said insert has smooth conjugation with the lateral side of its intermediate portion, and along with this, the length of the intermediate portion of the insert about its longitudinally extending axis does not exceed the head portion of the insert about the same axis.
Besides, owing to the fact that the base of the insert has
REFERENCES:
patent: 5074623 (1991-12-01), Hedlund et al.
patent: 5141289 (1992-08-01), Stiffler
patent: 5161859 (1992-11-01), Larsson et al.
patent: 5219209 (1993-06-01), Prizzi et al.
Alexandrov Yurii Victorovich
Grinevitskii Yurii Alexandrovich
Levankovskii Igor Anatolyevich
Shults Victor Danilovich
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