Tool driving or impacting – Automatic control of power operated means – Drive means responsive to torque or speed condition
Patent
1997-12-17
1999-08-10
Sipos, John
Tool driving or impacting
Automatic control of power operated means
Drive means responsive to torque or speed condition
173178, 173218, 408 59, 415 80, B23Q 500, E21B 300
Patent
active
059343850
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a threading attachment for internal or external threading which includes a spindle head that is intended to be attached to a spindle on a machine tool, and also a tap holder in which a tap is arranged during the threading work. The tap may, for example, be a tap for internal threading of holes or a die for external threading of a bar. The invention also relates to a threading method.
2. The Prior Art
For internal threading of holes by means of known threading attachments, the threading attachment is attached to a spindle on a machine tool and is also connected to a firm part of the machine tool via a protruding arm. The threading attachment includes a spindle head in which a tap holder is placed to support a tap and to cause the tap holder and the tap to rotate during the feed motion into the hole to be threaded when the spindle head is rotating. When the tap has reached the required depth of thread, the feed motion will be stopped and changed into an outfeed motion, the tap holder via a planetary gearing in the spindle head being brought to rotate in the opposite direction and to thread the tap out of the hole during the outfeed motion. In order to make this reversed direction of rotation possible, it is necessary to fix the position of the planet wheels in relation to the machine tool with the above-mentioned protruding arm.
Because of their construction, the known threading attachments of the kind mentioned above are expensive to produce and to some extent sensitive to interruption of the service. For that reason there is a requirement to achieve threading attachments which are both more inexpensive to produce and more reliable in running than the prior known threading attachments.
SUMMARY OF THE INVENTION
The object of the invention is to achieve a threading attachment of the type noted above which does not have the disadvantages of the hitherto known threading attachments, and to provide a method for internal or external threading of an object, the tap being arranged in a tap holder of a machine tool including a rotatable leading spindle and a compressed medium, for example, a cutting fluid for cooling, lubrication and grindings conveyor is available at the machine concerned.
The threading attachment according to the invention includes a spindle head which is intended to be connected with a spindle on a machine tool and also a tap holder in which a tap is arranged during the threading work. The threading attachment according to the invention includes a tap holder which in threading position has a power transmitting connection to the spindle head via driving members and in outfeed position is freely rotatable in relation to the spindle head, and that the tap holder directly or indirectly is arranged to be effected by a compressed medium.
The invention also involves a threading method wherein housing during the threading with the tap when the tap has reached the required depth of thread, direction opposite to the direction of rotation, whereby the tap is backed out.
Thus, the novelty and characteristic of the threading attachment according to the present invention is that the tap holder with the tap in power transmitting sense is disengaged from the spindle housing during the back out process and is imparted rotation during the back out by means of a compressed medium. This medium is preferably a cutting fluid or another fluid or a gas, compressed air. As the tap holder and the spindle housing are disengaged when the required depth of thread is reached, the spindle of the machine tool is allowed to rotate during the outfeed motion as well as to stand still.
The tap holder is preferably made to rotate by means of a driving member which is arranged to be effected by a medium escaping through the tap, but it lies within the scope of the invention to effect the driving member with a compressed medium fed via a separate feeding device which is firmly connected with the machine tool, e.g., a swivel, as it is called, i.e., a sl
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patent: 4566849 (1986-01-01), Flink
patent: 5203651 (1993-04-01), Johnson
patent: 5566770 (1996-10-01), Bowser
Jensen Steven
Sipos John
Svenska Precisionsverktyg AB
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