Tool for machining drill hole surfaces

Details Tool for machining drill hole surfaces Tool for machining drill hole surfaces

1999-07-16

2001-04-24

Bishop, Steven C. (Department: 3722)

Cutting by use of rotating axially moving tool

Tool-support with means to move tool relative to tool-support

To move radially

C082S001200, C082S001400

Reexamination Certificate

active

06220798

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of Invention
The invention relates to a tool for the machining of workpiece surfaces, especially of drilled-hole surfaces, having at least two parts which are displaceable relative to each other.
2. Description of the Related Art
Tools of the type referred to here are known. They are referred to as feedout or escape control tools. The relative movement of the tool parts can be brought about in various ways, for example by a control rod, an integral electric motor with or without gears, or with the aid of the lubricant or coolant. In conventional tools, the lubricant or coolant moves within a closed circuit, meaning that it is repeatedly used. In such cases it is impossible to exclude the possibility of impurities in the coolant passing into the tool and impairing the function of the tool and/or the implementation of the relative movement of the two parts thereof. Tools having a control rod or integral electric motors are elaborate in construction and large, and therefore expensive.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a tool of the type referred to initially which does not exhibit these disadvantages, in other words, is of simple construction and functionally reliable.
To achieve this object, a tool is proposed in which it is possible, in the machining of drilled-hole surfaces, to use a fixed tool which is introduced into a drilled hole in a rotating workpiece. In the tool proposed here, it is assumed that the tool for the machining of the drilled-hole surface can be caused to rotate. The tool is characterized in that at least one control member is provided which is displaceable substantially perpendicularly to the axis of rotation of the tool and is displaceable on rotation of the tool because of the centrifugal forces. It is possible, in this arrangement, for the control member to be displaced exactly radially, in other words, perpendicularly to the axis of rotation. However, it is sufficient if at least one movement component of the control member acts substantially perpendicularly to the axis of rotation of the tool. As a result of the displacement of the control member, a relative movement of one tool part relative to the other is effected—preferably from a threshold speed of rotation that can be preset. It is thus apparent that the relative movement of the two tool parts can be effected solely on the basis of the centrifugal forces arising during rotation of the tool. The tool proposed here is therefore very simple and fault-free in its construction, and can also be produced cost-effectively.
A preferred embodiment of the tool is one which comprises a spring member which interacts with the control member. The spring member is designed such that a predetermined restoring force is exerted on the control member. If, therefore, the speed of rotation falls below the presetable threshold, the relative movement of the tool part relative to the other occurs in the opposite direction.
In another preferred embodiment of the tool, the control member interacts with a control medium and causes a flow of this medium in the event of a displacement within the tool. A hydraulic resistance is provided in the flow path of this medium, with the aid of which a uniform flow can be instituted. Influencing the flow of the control medium makes it possible to ensure a uniform movement of the control member.
Preference is also given to an example of the tool wherein the control member directly effects a displacement of one tool part relative to the other. The resulting construction here is particularly simple and very immune to faults.
Another example of the tool is also preferred wherein the control member effects a displacement of the tool part relative to the other via a medium, preferably via a fluid. The control member is thus part of a hydraulic circuit which permits the movement of one tool part relative to the other.
Finally, in a preferred embodiment of the tool, the control member is part of an assembly unit which can be inserted into the tool. It is thus possible to employ assembly units with different characteristics, for example, control members of different sizes or masses, throttles with various hydraulic resistances introduced into the hydraulic circuit and/or spring members with different restoring forces, and so to adapt the tool to different applications. The tool can thus be varied cost-effectively.
Further embodiments and advantages apparent from the description below.


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