Cutters – for shaping – Rotary cutting tool – Including holder having seat for inserted tool
Patent
1998-02-17
2000-09-12
Tsai, Henry W. H.
Cutters, for shaping
Rotary cutting tool
Including holder having seat for inserted tool
407 50, 407109, 407110, 407 53, B23B 2716
Patent
active
061168238
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
This invention relates to slot milling tools, i.e. axially thin disc shaped bodies adapted to carry inserts and having peripheral seats intended to receive such inserts.
BACKGROUND OF THE INVENTION
Numerous constructions of slot milling tools are known. In one known case, the holding of the inserts is entrusted the inherent elasticity of the disc material wherein a self locking effect is achieved by displacing a portion of material adjacent the seat out of its rest position and by elastical force holds the insert in its inserted position. The force biassing the insert corresponds to the force necessary to displace the material portion so much as allowing the insert to be inserted.
On devices arranged according to the known art, there always is a risk for fatigue or diminishing of the elasticity or the spring power of the material portion displaced resulting in a reduction or loss of the intended holding force. This implies especially at high speed rotating milling discs not only a technical disadvantage but also a great risk for personal injuries in that disengaging inserts with high power like bullets can be thrown long distances.
OBJECTS OF THE INVENTION
One objects of the invention is to bring about a new construction of especially slot milling tools and other milling tools so arranged that it maintains the basic features of the holding system but gives a better holding function less inclined for fatigue.
SUMMARY OF THE INVENTION
The new invention is based on experiences from insert holders for parting off and the like wherein an insert is arranged in a recess and held there by a projection extending above the shaft portion of the insert wherein the shaft portion presents an engagement surface inclined against the direction of insertion and the projection which is elastically resilient presents an engagement portion engaging said surface. In engagement position, the engagement portion of the projection is displaced from its position of rest and holds the insert by means of its inherent elasticity which, thus, counteracts the displacement, against the guide for same.
According to the invention, a slot milling tool includes an essentially disc shaped supporting means having a number of seats along its periphery and at each seat an elastically displaceable projection. The projection is essentially radially extended having a root portion situated radially inside and peripherally off set relatively to the position of the insert and an outwardly tapering trunk portion with a peripherally laterally displaced nose portion presenting a peripherally facing engagement portion arranged to cooperate with an opposite peripherally facing pair of joining surfaces of the insert.
The shape of the projection and the shape of the seat for the insert are such that the holding power acting against the insert increases with increasing cutting force thanks to the radial component biassing the projection so that the holding power exerted by its nose will increase with increasing cutting force. The holding power will vary according to the kind of work and will increase with increasing cutting power and stress.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in details in the following with references to the accompanying drawings, in which
FIG. 1 is a side view of a milling disc arranged according to the invention,
FIG. 2 is a broken out enlarged portion of the same disc, and
FIG. 3 is a perspective view illustrating a tool arranged for facilitating the change of inserts.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The milling disc 1 functioning as holder for the inserts is made of high quality steel material or the like and normally has a thickness in the range of 2-6 mm.
The disc 1 has a central shaft bore 2 with a recess for a key.
Along the periphery are arranged a number of seats 3 for inserts 4, only one shown in FIG. 1 and this is arranged as follows.
The seat proper includes a V-shaped guide 5 extending from the periphery disc 1 and following a chord,
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Microna AB
Tsai Henry W. H.
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