Cutting by use of rotating axially moving tool – Tool or tool with support – Having stepped cutting edges
Patent
1990-06-28
1993-11-30
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Tool or tool with support
Having stepped cutting edges
408239R, B23B 5100
Patent
active
052659887
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a drilling/chamfering tool including a tool holder which holds at its front end a chamfering head and a commercially available drill with cylinder shaft, and appropriate adjusting and cutting elements, in accordance with the preamble of claim 1.
The requirement of deburring or chamfering a bore in the same work step has in the past been carried out with a series of different tool combinations. Tools known for this purpose are, for example, step drills with fixed step lengths, twist drills with chamfering rings which are screwed or clamped to the drills, and twist drills with spring-mounted countersunk sleeves. The chamfer cutting blades of these tools are constructed in different embodiments either ground or clamped (see DE-AS 20 62 757, DE-OS 28 00 077, DE-OS 36 10 016).
Modern NC-manufacture is making new requirements of the tool system with respect to planning, administration and availability of tools. Among these requirements are: manufactured, preferably in one work step, cutting edge and groove geometries, high cutting values, problem-free chip removal even in materials producing long chips, reduce the number of different types of tools and lead to cost savings in administration, storage and procurement of tools, adapted for the purpose and which reduce the work required for assembly and initial adjustment, and different spindle supports using relatively few structural components.
These relatively substantial requirements are not met by known tools for drilling and chamfering.
The deficiencies occurring most frequently are the accumulation of chips in the region of the chamfer cutting edges and the necessity to make available a large number of tools when a drill and a chamfering tool is to be provided for each bore diameter. For example, DE-OS 28 00 077 shows a drilling/chamfering tool which includes a tool holder which supports at its front end a clamping head and a twist drill with a cylinder shaft and which has at its rearward end a tool support with a possibility of adjusting the depth of the drill. The cutting head is exchangeably fastened on the tool holder by means of a screw thread, while the drill is moved or fixed with respect to rotation by means of holding screws which engage in the grooves. The drill proper has essentially equal drill and shaft diameters. Accordingly, it is necessary to provide for each bore diameter a drill, a cutting head and a tool holder. Because of the large number of different tools, this means that the procurement is expensive and a large number of tools must be kept in store.
It is the object of the invention to provide a tool of the above-described type which does not have the above-mentioned disadvantages and which meets in an optimum manner the described modern requirements of tool systems. Particularly, an accumulation of chips is to be avoided and the tool system should be of modular construction with uncomplicated availability and inexpensive procurement and storage.
This object is met by a drilling/chamfering tool of the described type with the characterizing features of claim 1.
Additional developments and different embodiments are mentioned in the dependent claims.
Accordingly, it is an essential feature of the invention that the cylinder shaft of the twist drill is greater than or equal to the bore diameter and has at least one clamping surface. This leads to the advantage that a large number of different drills with different bore diameters can be received in the tool holder without requiring any additional operation, wherein clamping or moving of the drill takes place in an area into which chips do not penetrate, so that clamping does not impair the flow of chips.
The chamfering head of the tool according to the invention is constructed so as to be rotatable by 360.degree. about the tool axis, so that it is possible for each drill position to adjust the position of the chamfer cutting edges which is favorable to the chip removal in the drill portion (L) which projects out of the chamfering head. The adjustment of the chamferin
REFERENCES:
patent: 3557419 (1971-01-01), Flannery
patent: 4714390 (1987-12-01), Eckle et al.
patent: 4784536 (1988-11-01), Pfalzgraf
patent: 4971491 (1990-11-01), Cook
patent: 5071295 (1991-12-01), Greig
Nigg Hansuli
Nigg Leo
Schmigalla Christian
Howell Daniel W.
MAS Maschinenbau AG
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