Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1987-09-03
1989-07-04
Desmond, Eugene F.
Metal working
Method of mechanical manufacture
Assembling or joining
409234, B23C 526
Patent
active
048437093
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a shell-type milling cutter and a method for attaching the shell-type milling cutter. More particularly, the present invention relates to such a shell-type milling cutter having a very high attachment strength and accuracy in the cutting work. Such good peformance as described above is derived from a provision of a hole for attaching or fitting the shell-type milling cutter to a cutter arbour and which is formed into a tapered hole expanding downwards for attaining a more positive attachment of such shell-type milling cutter to the cutter arbour. As a result, an end surface of the upper portion and opposite side surfaces of the fitting hole function to attain more firm fixation of the milling cutter, and such an area for allowing the shell-type milling cutter to be in close contact with the cutter arbour increases, and in addition the performance of the shell-type milling cutter according to the present invention becomes substantially the same with that of an integral structure type milling cutter in even high-speed and heavy-duty cutting operations, besides easy attachment and detachment of a milling cutter can be effected in the present invention. The invention relates also to a method for attaching the above-mentioned shell-type milling cutter to the cutter arbour.
BACKGROUND ART
In general, when a shell-type milling cutter is compared with such an integral structure type milling cutter being integrally composed of a cutting edge portion and a shank portion, the shell-type milling cutter is inferior to that of the integral structure type in all the points of performance such as rigidity, machinability, strength, accuracy of finishing, wear proof and the like, since an area where the cutting edge portion of the milling cutter is in close contact with the fitting shaft of a cutter arbour is small and a degree of such close contact is low. On the other hand, if size of a milling cutter itself is large, the manufacture of such an integral structure type milling cutter becomes expensive, besides it is very uneconomical because the worn cutting edge portion of which must be replaced by a fresh one together with a fresh shank portion despite unnecessary replacement of the old shank portion which has not yet been worn, and for this reason, a shell-type milling cutter only the edge portion of which is exchangeable and which is inexpensive and easily manufactured has been used at the present time. In this connection, as a method for attaching such shell-type milling cutter to its cutter arbour, there has heretofore been, as shown in FIG. 1, such a method that a fitting shaft (31a) of a cutter arbour (31) is inserted into a fitting hole of a shell-type milling cutter (11), and further the milling cutter (11) is fixed to the cutter arbour (31) by means of a bolt (5). In this method, however, when a cutting work is conducted, the bolt (5) becomes loose due to vibration derived from the cutting, so that a degree of close contact of the milling cutter (11) to the cutting arbour (31) becomes poor. In this respect, when a rotational frequency or an amount of cut is increased in order to cover such defects as described above, vibration and the like produces, and as a result there arises a further disadvantage such that a life of the shell-type milling cutter (11) is remarkably shortened, accuracy in the finishing becomes inferior so that the rotational frequency and the amount of cut are restricted, whereby an improvement of the cutting efficiency is significantly impeded. Furthermore, there is another method for attaching a shell-type milling cutter to a cutter arbour wherein the outer circumference (32a) of a fitting shaft of the shell-type cutter arbour (32) as well as a fitting hole (12a) of the shell-type milling cutter are defined with a left-handed screw thread, respectively, as shown in FIG. 2, and both the members are threadedly engaged with each other. According to this method, when a cutting work is made, the screw is automatically fastened to increase a degree of
REFERENCES:
patent: 1797296 (1931-03-01), Ray
patent: 2912904 (1959-11-01), Peterson
patent: 3656785 (1972-04-01), Lothar
patent: 4322190 (1982-03-01), Anderson
patent: 4325664 (1982-04-01), Mori
Desmond Eugene F.
Kabushiki Kaisha Aideie
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