Metal tools and implements – making – Blank or process – Drill
Patent
1996-07-08
1998-07-21
Payer, Hwei-Siu
Metal tools and implements, making
Blank or process
Drill
761081, B23B 5102, B23P 1532
Patent
active
057821453
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
TECHNICAL FIELD
The present invention relates to a process for the fabrication of a multi-blade tool as well as to the multi-blade tool fabricated therewith itself.
STATE OF THE ART
Today multi-blade tools, such as e.g., drills, are fabricated in a material and time consuming manner.
In order to reduce the material consumption required by the fabrication of drilling tools, such as described in EP 0 361 189 Al, a masonry drilling tool composed of a head, a shaft having an extraction screw surface and a central reinforcement in the tool axis and fastening taps has been developed. The shaft having an extraction screw surface is formed by a twisted flat rod having in the axis of the drill tool a reinforcement measuring crosswise two to three times the thickness of the flat rod.
The object of the invention in the cited European patent is to create a drilling tool which will, in particular, due to greater stability and longer service life improve the quality of the boreholes. Moreover, less material consumption makes these more economical.
However, this document does not state how to minimize material consumption and thereby minimize the cost of fabricating a multi-blade tool by, e.g., using a flat profile as feedstock in order to be able to utilize the drill tool in working with steel and other metals.
DESCRIPTION OF THE INVENTION
The object of the present invention is to provide a process for fabricating a multi-blade tool which permits fabricating multi-blade tools with minimal material consumption and minimal cost.
This object is solved by providing a process for fabricating a multi-blade tool, said tool having an axis of rotation, said process comprising t he steps of: hot extruding a profile having a cross section which corresponds to an untwisted cross section of the tool; and twisting at least a portion of said profile about said axis of rotation via at least two sets of rollers, each of said sets of rollers being spaced apart from each other along a longitudinal axis coaxial with said axis of rotation of said tool, each said set of rollers comprising at least two rollers, said rollers of each said set of rollers being spaced apart from each other radially with respect to said longitudinal axis to define a space therebetween corresponding to a twisted cross section of the tool.
The invented process for fabricating a multi-blade tool permits non-cutting fabrication of semi-finished products having a tool shaping profile. In particular, the drills can be completely made of a high alloy HSS steel, such as e.g., material No. 1.3343 or the like. As the invented process does not require working a drill out of solid material but rather uses "flat material", the saving of material is high, about 50 to 75%. The developed process ensures that blade geometry and helical pitch can be produced with little tolerance. Solid profiles or profiles having at least one borehole preferably a central passage of any shape can be used as feedstock. The passage may be employed for feeding a coolant respectively a lubricant or for holding the tool shaft.
Fabricated cutting tools may be, e.g., drills, mills, reamers, etc. Especially preferred is using the invented process for making drills having a large diameter of 30 millimeter or more.
A particular advantage of the invented process is much quicker fabrication of special blade tools from freely selectable basic profiles. The tool can be quickly and easily reground to shaping or multi-step drills.
The process for fabricating a multi-blade tool out of high strength tool steel is carried out according to the following steps: a profile having a cross section corresponding to the to-be-fabricated multi-blade tool is produced by warm extruders and then the profile is twisted, in particular, without cooling down to room temperature.
It is feasible to process the profile to produce the blades prior to twisting.
Especially preferred is, however, that the lateral blades for making a transverse chamfer are processed following twisting and tempering. Accordingly it is
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