Gear cutting – milling – or planing – Milling – With limit means to aid in positioning of cutter bit or work
Patent
1989-06-07
1991-07-30
Briggs, William
Gear cutting, milling, or planing
Milling
With limit means to aid in positioning of cutter bit or work
33639, 33640, 36447434, 408 13, B23C 900, B23B 4900, G06F 1546, B27G 2300
Patent
active
050355562
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a machine for automatically regulating and measuring the length of extension and the diameter of a tool, mounted in a conical mandrel and capable of cooperating with a receiving cone of the machine, as well as for measuring the diameter of said tool.
The machine is more particularly adapted to cutting tools, such as for example mills with smooth cylindrical shank each mounted in a conical mandrel provided with an opening axial tap, receiving the smooth cylindrical shank of the mill. The conical mandrel comprises, in known manner, means for tightening the tool, as well as an adjustment means housed in the axial tap and against which the shank of the tool comes into contact.
The assembly constituted by the conical mandrel and the tool is intended to be arranged, once the operations of adjustment and of measuring have been effected, in one of the broaches or machining heads of a numerical-control machine tool. This type of multi-broach machine tool is more and more widespread in manufacturing workshops for economical reasons of productivity, quality of machining, reliability and cost, since they make it possible, for example, to effect identical machinings on the same workpiece or on a plurality of workpieces fast with the table of the machine-tool, from the assemblies mentioned hereinabove each mounted in one of the broaches of the machine tool.
In order to obtain identical machinings and to avoid waste of the machined workpieces not coming up to required dimensions, it is thus imperative, before mounting each assembly fitting in a receiving cone of the broach, to regulate and measure with precision, to within the tolerances, the length of extension of each tool with respect to a reference of the mandrel and the diameter of each of the tools.
At the present time, the operations of adjustment and of measurement, for this type of determined tools, which mills with smooth cylindrical shank are, are carried out manually by acting on the adjustment means, such as a screw, via a screwdriver, which makes it possible to adjust the dimensions or length of extension of the mill with respect to the mandrel. Measurement is then effected by means of a short measuring tape and a comparator, then the operator, with the aid of a spanner, acts on the tightening means, such as a nut, thus blocking the mill via an elastic split bush, which holds the shank of the mill. Whilst the operator is tightening the nut, the mill tends to descend with the bush, which may modify the length of extension of the mill, particularly in the case of the operator exerting a tightening torque greater than that theoretically provided.
These operations, described succinctly, are to be renewed for each tool and mandrel assembly intended to equip the broaches of the numerical-control machine tool. Prior to their respective assembly in said broaches, these assemblies are passed over a measuring bench indicating the lengths of extension and the diameter of the mills. When, for example, the length of extension of a tool does not correspond to the length required, the assembly must be manually adjusted again.
Consequently, all of the operations, for the majority carried out manually, for effecting adjustment and measurement of the length and diameter of each mill in its respective mandrel, require several work stations, appropriate equipment for each of these stations, as well as staff allocated for these operations, and require considerable time.
The present invention has for its object to overcome these servitudes and concerns the design of a machine which, prior to mounting each assembly constituted by a tool and a mandrel in the broaches of the machine-tool, allows automatic adjustment and measurement of the length of extension of each tool, as well as the measurement of their diameter, said machine being equipped with a receiving cone identical to that with which the broaches of the machine tool are provided.
To that end, according to the invention, the machine for automatically adjusting and measuring the length of e
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patent: 4334178 (1982-06-01), Hille
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Automatic Tool Sizing for Auto-Changers, Metalworking Production, vol. 124, No. 9, (Sep. 1980), pp. 123 and 127.
Gaquere Jean-Pierre
Lamotte Lionel
Mirey Jean-Claude
Omiel Jean
Aerospatiale - Societe Nationale Industrielle
Briggs William
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