Gear cutting – milling – or planing – Milling – Work support
Patent
1988-09-19
1990-05-01
Bishop, Steven C.
Gear cutting, milling, or planing
Milling
Work support
269 57, 269137, 269154, 269217, 269234, 409198, 409225, 409903, B23Q 306
Patent
active
049213784
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a rotary-pallet system, in particular for multi-directional machining of the pieces to be machined, in which said system there is a body piece, one of whose ends is attached to a holder, which is rotable around a longitudinal axis, and against whose longitudinal guide faces one or several pieces to be machined can be positioned.
There is a considerable variety among rotary-pallet systems. Generally speaking, they are complicated, difficult to use, and require one or several fastening members per one piece to be machined and are, as a rule, not suitable for multi-directional machining.
There are many reasons to minimize the changes of tools to a level as low as possible, because it is these changes that cause most of the servicing on the machines. Reasons for this are, e.g.:
contaminations remaining between the grip faces of the tools cause centering faults, vibration, and wear of the tapers on the tools,
wear of the tool change mechanism,
loss of working time during change of tool.
The precision of location on the CNC machines is in itself very high. The largest dimensional errors mostly result from an excessively high number of different fastening steps, examples of which are:
incorrect choice of fastening and guide plane,
faults of shape and dimension on pieces,
dimensional errors caused by chips and impurities,
incorrect location in view of the program.
It should be noticed that the fault does not consist of one of these, but it is an aggregate sum of all of these factors together.
The rotary-pallet system in accordance with the invention is mainly characterized in that one or several wedge pieces can be attached to the edge of the guide face on the body, the wedge face on the said wedge piece being pressed towards a side of the piece to be machined, whereat a counter-face is provided at the opposite side of the piece to be machined, and that the wedge piece can be attached to the body by means of a fastening member, which is directed in such a way diagonally or radially towards the longitudinal axis of the body that the direction of the fastening movement of the wedge piece approaches both the body and the piece to be machined at the same time.
The present new rotary-pallet system involves considerable advantages:
With one fastening, the precision of the ready-machined piece is almost the same as the locating precision of the machine.
The pieces to be machined need not be hammered, because the fastening member also pulls them against their base.
Fastening members of low height permit machining of the outer plane of the piece by means of frontal cutters as well as machining of edge chamfers.
By means of the shape, length and location of the wedge pieces and of the support guides, it is possible to perform drillings, countersinkings, etc. in the directions of 90.degree. or 180.degree. right down to the bottom plane.
When pieces of irregular shape are being fastened, the desired fastening points are chosen and the base, the guide support, and the wedges are shaped so that they become suitable for the fastenings and machinings.
The smaller the requirement of space of the fastening member, the more will there be space available for the pieces to be machined.
The invention and its details will be described in more detail in the following with reference to the attached drawings, wherein
FIG. 1a is a sectional view of a fastening member to which 8 lines of rectangular pieces to be machined can be attached,
FIG. 1b is a detail of FIG. 1a,
FIG. 1c is one alternative for the detail of FIG. 1b,
FIG. 1d is another alternative for the detail of FIG. 1b.
FIG. 2 is a sectional view of a fastening member to which 4 lines of rectangular pieces to be machined can be attached,
FIG. 3a is a sectional view of a fastening member to which 4 lines of cylindrical pieces can be attached so that one end of the cylinders is facing the central axis of the fastening member,
FIG. 3b is a side view of the fastening member shown in FIG. 3a,
FIG. 4a is a sectional view of a fastening member to which cylind
REFERENCES:
patent: 3385138 (1968-05-01), Wusteney et al.
patent: 4489927 (1984-12-01), Yamada et al.
patent: 4643411 (1987-02-01), Izumi
Bishop Steven C.
OK-Vise Ky
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