Gear cutting – milling – or planing – Milling – Including means to infeed rotary cutter toward work
Patent
1983-11-03
1985-12-17
Bilinsky, Z. R.
Gear cutting, milling, or planing
Milling
Including means to infeed rotary cutter toward work
51238S, 82 9, 82 39, B23C 306
Patent
active
045589780
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a machine for machining crankshafts operating on the gyrocutter principle having two machining units and one corresponding clamping device each.
A machine of this kind is known from U.S. Pat. No. 4,180,359. This machine has two machining units for machining a crankshaft held at both ends. A clamping device is associated with each machining unit. When closely adjacent crankpins are to be machined, only one of the two clamping devices is used at the main journal situated between the crankpins. The other clamping device is shifted radially outwardly. Support of this kind is sufficient in the case of short crankshafts, but it has the disadvantage that the clamping device that is not in use takes up a considerable amount of radial space.
Particularly in the machining of crankpins, a secure support directly adjacent the point of machining is necessary, because, on account of the leverage, the cutting forces produce a great torque on the crankshaft. Due to the trend towards ever smaller motors, especially in the automotive field, the crankshafts are being made increasingly more compact. The spacing between the crankpins and main journals is becoming ever shorter, and the cranks between them ever thinner; the workpiece becomes consequently less stable. Furthermore, the trend toward faster machining necessitates a higher cutting performance. As a result, the need for optimum support directly adjacent the cutting point is acute. As a result of the very small amount of space available, it is therefore necessary, especially if inwardly situated crankpins are being machined at the same angular position, to achieve a good evacuation of the chips. Furthermore, the two machining units are so close to one another in the machining of the inner crankpins that there is no space in the very tight interstice for two clamping devices for the production of two stable additional holding points. In this narrow interstice, however, assurance must be obtained that the crankshaft is held perfectly steady, that the outwardly flying chips are caught, and a greater chip space is present for the removal of the chips from the machining area. If, however, the crankpins situated further outwardly are being machined, that is, if a relatively great distance is present between the machining units, then the clamping device associated with each machining unit must satisfy the above-named requirements, doing so directly at the main journal situated directly beside the crankpin being machined.
The invention therefore sets out from the technical problem that such machines must be designed such that unstable workpieces, such as crankshafts for example, in which the distance between the crankpin and main journal is small, can be clamped up in an optimum manner, and the chips can be caught and removed reliably.
This technical problem is solved in accordance with the invention by having two clamping devices clampingly support the crankshaft at the same main journal during the machining of two crankpins.
It has been found that it is possible to construct the clamping devices and the machining units such that both clamping devices engage the same main journal when crankpins closely adjacent to one another are being machined. In this manner, particularly in the case of unstable crankshafts of compact construction, having thin webs and short spacing between main journals, optimum clamping, chip catching and chip evacuation conditions can be created. The clamping devices can be constructed such that they are simple and stable, and in this manner cheaper methods of production and low manufacturing costs can be achieved.
The invention is explained below by way of example, in conjunction with FIGS. 1 to 5, wherein:
FIG. 1 is a side view of a clamping device of the machine for machining crankshafts,
FIG. 2 is a top view of the clamping means,
FIG. 3 is a vertical section of the clamping means, and
FIGS. 4 and 5 show the mounting of a sealing bar.
The illustrated machine for machining crankshafts serves for the machining of a six-throw cr
REFERENCES:
patent: 2650522 (1953-09-01), Godfriaux
patent: 4180359 (1979-12-01), Schmid
Bilinsky Z. R.
Oerlikon-Boehringer GmbH
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