January 27, 2016 - 6:46 PM EST
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Patent Issued for Spindle/Tool Combination for a Machine Tool (USPTO 9238268)

By a News Reporter-Staff News Editor at Journal of Engineering -- According to news reporting originating from

Alexandria, Virginia
, by VerticalNews journalists, a patent by the inventors Rieker, Hartmut (Salach, DE); Bayha, Thomas (Markgroeningen, DE), filed on February 8, 2013, was published online on January 19, 2016.

The assignee for this patent, patent number 9238268, is MAG IAS GmbH (Goeppingen, DE).

Reporters obtained the following quote from the background information supplied by the inventors: "The invention relates to a spindle/tool combination for a machine tool, comprising a tool, a spindle, on which the tool is releasably fixable and by means of which the tool is rotatable, the tool having at least one linearly movable rod and the spindle comprising a loading device, which acts on the at least one linearly movable rod of the tool, and a pull/push coupling device, by means of which the at least one rod of the tool is couplable to the loading device, the at least one rod being actuable by the loading device by pushing and pulling when coupled.

"A honing spindle is known from DE 10 2006 007 704 A1, having a shaft for transmitting forces and torques to a tool body of a honing tool, with a feed rod, which is associated with the shaft and which is provided to apply a machining force to a pressure rod of the honing tool, and with a tool receiver provided on the shaft at the end, said tool receiver being configured for a releasable coupling of the honing tool, at least one adjusting device, which is configured to fix the tool body on the shaft, being associated with the tool receiver.

"A honing tool is known from EP 1 616 665 A1, with a tool body and at least one honing stone, which is movable relative to the tool body and can be actuated by an actuating mechanism, and with a coupling device for releasable connection to a honing rod. The coupling device has at least one locking element, which can be actuated from the outside by a holding device for fixing the honing tool.

"A machine tool to machine substantially rotationally symmetrical workpieces is known from DE 44 30 113 A1.

"A method is known from DE 10 2006 034 497 A1 for the fine machining of internal faces of bores in workpieces by fine drilling and subsequent honing, comprising the steps of fine drilling a bore of a workpiece by means of a fine drilling tool of a fine drilling device and transferring the workpiece into a machining position of a honing device to machine the finely drilled bore by means of a honing tool of the honing device.

"A method for machining a workpiece is known from DE 10 2007 045 045 A1, in which the workpiece is fixed to a workpiece carrier of a machine tool and the workpiece, in its state fixed to the workpiece carrier, is pre-machined by means of a preparation tool and the pre-machined workpiece is machined so as to be honed by means of a honing tool.

"A honing tool known from DE 10 2006 028 728 A1 for the finishing honing of bores in a workpiece, with at least one honing stone retainer, an adjusting mechanism for adjusting the diameter of the honing tool in the region of the at least one honing stone retainer, an interface for connecting the honing tool to a conventional machine spindle or a conventional adapter, intermediate piece or the like and a drive unit integrated in the honing tool to actuate the adjusting mechanism.

"A method is known from DE 198 59 051 A1 for the machine cutting of a workpiece to produce a non-level surface, in particular a valve seat, by means of a tool, with a base body having a cutter plate received by a holder.

"A spindle unit for machine tools is known from EP 0 780 192 B2.

"A honing tool with a fluid actuator is known from

U.S.
Pat. No. 7,070,491 B2.

"In the not prior published German patent application DE 10 2010 002 019 A1, a machine tool is described, which comprises a spindle, on which a tool can be releasably fixed and by means of which the tool can be rotated. The spindle has a loading device, which acts on at least one linearly movable rod of a tool, when the tool is fixed on the spindle. The spindle comprises a motor device, which is coupled to the loading device and which drives a linear displacement of the at least one rod by means of the loading device.

"A tool receiver is known from DE 20 2008 010 140 U1 for receiving a honing tool, which is formed by a tool body, which is provided with an internal channel and in which a feed rod is axially displaceable, and a honing stone retainer, which is radially displaceable in the tool body, which honing tool can be fixed to the honing spindle of a honing machine, in which a coupling piece, which cooperates with the feed rod of the honing tool and on which the feed pin of the honing machine acts, is displaceable in the tool receiver. The tool body is configured as a tube and is clamped in the internal channel of the tool receiver by a clamping jaw, wherein the tool body, secured with respect to rotational position by a rotational position fixing piece, and the coupling piece that is connected to the feed rod, secured with respect to rotational position by a groove/fitted key connection, are guided in the internal channel of the tool receiver."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "In accordance with the invention a spindle/tool combination is provided, by means of which a workpiece can be machined in a variable manner.

"In accordance with one embodiment of the invention, in the spindle/tool combination the pull/push coupling device comprises a clamping jaw and the clamping jaw is arranged in the tool.

"In the solution in accordance with the invention, a bracing of the at least one rod of the tool with the machining device can be achieved by means of the pull/push coupling device, this bracing being effective both for the forward travel movements (push movements) and for the return travel movements (pull movements).

"As a result, each position of the at least one rod of the tool can be adjusted in a defined manner both for the feed and the return travel by means of the loading device of the spindle. As a result, a workpiece can be machined both during the forward travel movement and during the return travel movement.

"No resetting device for the at least one rod of the tool has to be integrated in the tool, so the tool can be made more compact.

"Complex machining processes can be carried out by a tool having at least one rod, which can be positioned in a defined manner through pushing and through pulling. For example, freeform faces can be machined.

"The pull/push coupling device comprises a clamping jaw. The clamping jaw is used to produce a positive connection between the loading device and the at least one rod of the tool. The positive connection can easily be opened or closed, so a tool can easily be removed from the spindle or can be inserted therein. By providing a clamping jaw the spindle can be configured in a simple way; in particular, no control tube has to be provided in the spindle and no rotatable element has to be provided to produce the coupling.

"The clamping jaw is arranged in the tool. As a result, a housing of the tool can be used to receive and also support the clamping jaw. The spindle can thus be configured in a simple way. The pull/push coupling device can be at least substantially integrated in the tool. To produce the coupling or to release the coupling, notably only end faces are still required on the spindle and, in particular, no additional movable elements to produce the coupling or release the coupling are necessary on the spindle outside the loading device.

"In the solution according to the invention, a coupling point can be formed between the loading device and the at least one rod of the tool in the region of the clamping jaw. As a result, the dimensions of the tool can be kept small. This is advantageous, in particular, for a fluid passage, such as a cooling medium passage. This in turn allows, for example, a fluid tube with a small overall size to be used for the fluid connection between the spindle and tool.

"It is provided, in particular, that the loading device has at least one linearly movable rod, to which the at least one rod of the tool can be coupled. This allows a pushing loading and pulling loading of the at least one rod of the loading device to be directly achieved on the at least one rod of the tool.

"In particular, the spindle comprises a drive device for the loading device. This allows the at least one rod of the tool (control spindle) to be positioned and displaced in a defined manner, the positioning and displacement being achievable both during a forward travel movement and a return travel movement. The drive device may be differently configured. For example, it is formed by a motor device. The motor device may comprise one or more electric motors here. A fluid actuation of the loading device is basically also possible.

"It is advantageous if the tool comprises at least one tool element, which is adjustable by the at least one rod of the tool. The tool acts on a workpiece by means of the tool element. The tool element is, for example, a cutting edge or a cutting edge device.

"The at least one tool element is advantageously a cutting edge or a cutting edge device or comprises one such device. For example, the corresponding tool is a fine drilling tool with cutting edges. The tool may, for example, also be a honing tool with a cutting edge device, which is multi-edged and, in particular, comprises honing stones.

"It is favorable, in particular, if the tool comprises at least one cutting edge or cutting edge device, which can be coupled to the at least one rod of the tool, the cutting edge or cutting edge device being adjustable transversely to a rotational axis of the tool by means of the at least one rod of the tool. The transverse position of the cutting edge or cutting edge device can be adjusted precisely relative to the rotational axis of the tool by coupling by means of the pull/push coupling device, both with respect to the forward travel movement and the return travel movement.

"It is quite particularly advantageous if the pull/push coupling device defines a fixing position, in which the loading device is braced with the at least one rod of the tool with regard to pulling and pushing. In the fixing position, by means of the action of the loading device on the at least one rod of the tool, said rod can be displaced. During an exertion of pressure, a forward travel movement takes place. When the loading device is pulled back, a pulling movement of the at least one rod takes place. These travel movements are initiated here solely by means of the loading device.

"In a structurally favorable embodiment, one end face of the loading device abuts the at least one rod of the tool in the fixing position. As a result, a forward travel movement of the at least one rod of the tool can easily be realized by exerting pressure by means of the loading device.

"It is furthermore favorable if, in the fixing position, the at least one rod of the tool and the loading device are positively connected. As a result, a return travel movement of the at least one rod of the tool can easily be achieved during a return travel movement of the loading device.

"In one embodiment, the loading device has a recess and the at least one rod has a penetration region into the recess. As a result, a fixing of the at least one rod of the tool on the loading device can easily be achieved. A coupling for a fluid guide, for example for cooling medium and/or lubricating medium, can also easily be achieved between the spindle and tool.

"It is advantageous if a set-back region is arranged on an outside of the wall of the recess. A positive connection between the loading device and the at least one rod of the tool can easily be achieved by means of the set-back region of the loading device. The wall of the recess is used to form this set-back region (recessed region).

"In the solution according to the invention, a tool can easily be supplied, for example centrally, with fluid (cooling medium, lubricating medium, cooling lubricating medium) by means of the spindle. In one embodiment, the tool and/or the spindle has a rigid tube for fluid coupling.

"In an advantageous embodiment, the tool and/or the spindle has a movably mounted tube for fluid coupling between the spindle and tool. The coupling can be facilitated by means of a movably mounted tube and, for example, a tube mounted in a reciprocating manner. Sealing wear due to friction of the tube during the coupling process can be minimized.

"The clamping jaw is advantageously connected to at least one rod of the tool and displaceable therewith. As a result, a pull/push coupling is realized between the at least one rod of the tool and the loading device at a working travel region of the loading device of the spindle.

"It is structurally favorable if the clamping jaw has at least one pivotable gripping arm. A fixing position and a release position of the pull/push coupling device can easily be achieved by the pivotable gripping arm.

"In particular, the at least one gripping arm is pivotable about a pivot axis, which is oriented transversely to a movement direction of the at least one rod of the tool. If a blocking face blocks the pivotability of the gripping arm, a positive connection can easily be achieved between the gripping arm and the loading device. A fixing position can easily be released or a fixing position can be achieved starting from a release position by providing an entry region, which no longer blocks the pivotability.

"It is favorable if the at least one gripping arm is spring-loaded, a spring force tending to pivot the at least one gripping arm away from an axis of the at least one rod of the tool. If a corresponding blocking face is provided, the gripping arm cannot pivot so far that, for example, a positive connection between the at least one rod of the tool and the loading device is released. If the blocking face is no longer present, the positive connection can then be released in a simple and, in particular, automatic manner.

"It is favorable if the clamping jaw has a first abutment region, which cooperates with a second abutment region of the loading device, the first abutment region abutting the second abutment region and a positive engagement being produced when the at least one rod of the tool is coupled to the loading device. As a result, a pull/push connection can easily be produced between the at least one rod of the tool and the loading device of the spindle.

"In a structurally simple embodiment, the first abutment region is formed by a widening at one end region of a gripping arm. A positive connection between the loading device and the at least one rod of the tool can easily be produced by a widened end region of this type.

"The second abutment region is formed, in particular, by a set-back region on the loading device. When the first abutment region of the gripping arm enters a recess, which is delimited by the second abutment region and this entry position is secured, a positive connection is produced. A tool can be released when the first abutment region has been removed.

"In one embodiment, the tool has a support device, on which the clamping jaw is supported in a fixing position of the pull/push coupling device. An inside of the support device prevents the clamping jaw from pivoting out and thereby, in particular, secures a positive connection of the at least one rod of the tool to the loading device. A coupling can be produced or released by engagement on the support device (for example by moving the support device as a whole or by providing a movement or movability of a part of the support device). The support device can in turn easily be acted on by means of the spindle and, in particular, an end face of the spindle.

"In particular, in the fixing position, the first abutment region abuts the second abutment region and the support device provides a blocking face for the clamping jaw.

"It is advantageous if the support device has or delimits an entry region for a counter-region of the clamping jaw, the counter-region being located outside the entry region in a fixing position of the pull/push coupling device and penetrates the entry region in the release position of the pull/push coupling device. When the counter-region has entered the entry region, the clamping jaw no longer presses on the loading device and the tool can be released from the spindle. When the counter-region is located outside the entry region, and in particular abuts an inside of the support device outside the entry region, a pivotability of the clamping jaw can be blocked and a positive connection can thereby be produced. By a movement of the support device or on the support device, the entry region can be brought over the counter-region in order specifically to achieve an entry and therefore a release of a positive connection. Conversely, by a corresponding positioning of the support device or on the support device, the counter-region can be removed from the entry region in order to produce a positive connection to the loading device. By, for example, displacing the support device, a fixing or release of a tool can thereby be obtained with regard to the loading device.

"If, for example, the support device is spring-loaded, a fixing position can automatically be achieved by corresponding positioning of the loading device. By a corresponding exertion of force counter to the spring force on the support device, a tool can be released.

"In particular, a first abutment region of the clamping jaw does not abut a second abutment region of the loading device when the counter-region penetrates the entry region. Advantageously, a positive connection is achieved between the at least one rod of the tool and the loading device when the first abutment region of the clamping jaw abuts the second abutment region of the loading device. This positive connection is released by the entry of the counter-region into the entry region.

"It is quite particularly advantageous if the entry region or a delimiting device of the entry region is movable. As a result, the entry region can be positioned in a controlled manner. A removal can be allowed or facilitated in order to fix a tool. Furthermore, an entry can be allowed or facilitated to release a tool.

"It is provided, in particular, that the support device is movable and/or has one or more movable elements. As a result, the movement in and out of the clamping jaw can easily be carried out to release a positive connection or produce a positive connection. The support device is arranged in the region of the clamping jaw and in particular surrounds it. The tool can thus be formed with small dimensions and the movability of the support device, as a whole or as a part thereof, easily allows the release or fixing.

"In one embodiment, the support device comprises a sleeve, which is movably and, in particular linearly movably, arranged on the tool. A fixing, and in particular positive fixing, of the at least one rod of the tool on the loading device can thus easily be achieved and this positive fixing can easily be released.

"It is advantageous if the sleeve is spring-loaded, a spring force tending to push the sleeve, in the fixing position of the pull/push coupling device, in the direction of the loading device. It is thereby possible for the sleeve, in a working travel region of the loading device, to form a blocking face for a pivoting out of the clamping jaw. Due to the spring force, the position of the sleeve ensures a positive connection between the clamping jaw and the loading device.

"In an advantageous embodiment, a blocking device is provided to block a displaceability of the sleeve away from the loading device. A transition can thereby easily be achieved between a release position and fixing position and vice versa.

"In particular, a release position of the pull/push coupling device is defined by an abutment of the sleeve on the blocking device. If the loading device is then in a corresponding position, in particular an entry region of the sleeve and a counter-region of the clamping jaw are located over each other, so an entry is made possible and a positive connection between the at least one rod of the tool and the loading device is cancelled.

"It is advantageous if the sleeve has an end face, on which the spindle can act to displace the sleeve by means of the spindle and, in particular, by means of an end face of the spindle. For example, a displacement of this type can be achieved when the tool is held, for example, by a tool releasing device and the tool spindle acts with its end face on the sleeve and displaces it such that, in particular, an entry of the counter-region of the clamping jaw into an entry region is made possible to release a positive connection between the at least one rod of the tool and the loading device. The sleeve can be freed and a fixing position secured by a corresponding translatory return travel movement of the spindle as a whole.

"In a further embodiment, the support device comprises a tongue device with at least one tongue, which is movable transverse to a displacement device of the rod. In particular, the at least one tongue is configured and/or arranged to be resilient and correspondingly resiliently and flexibly movable. The tongue can then be positioned in such a way that an entry into the entry region or a removal is easily made possible. This can in turn be controlled, in particular, by means of the spindle (by means of the positioning thereof). As a result, a fixing and release are easily made possible. In particular, the production or cancelling of a positive connection between the clamping jaw and the loading device of the spindle can be carried out easily.

"Advantageously, the tongue device delimits an entry region for the clamping jaw. As a result, the at least one tongue can easily be accessed and, in particular, the tongue can be acted on by means of the spindle and advantageously by way of an end face of the spindle.

"It is particularly advantageous if arranged on the tool is a blocking device, on which the spindle can act, in particular by means of an end face in order to free and/or block the transverse movability of the at least one tongue. A blocking of the transverse movability is, in particular, provided when the tool is fixed on the spindle. To produce the fixing position or to release the fixing position, it is advantageous if a movability of the at least one tongue is allowed. In a simple manner, this allows a release of the positive connection, as the movability of the tongue allows a corresponding movability of the clamping jaw.

"In one embodiment, the blocking device comprises at least one blocking element, which is displaceable between the tongue device and a wall of the tool. The position of the at least one blocking element determines whether transverse movability of the at least one tongue is allowed or not. The transverse movability of the at least one tongue can thus be controlled by means of the positioning of the at least one blocking element. The at least one blocking element can easily be displaced by means of the spindle and, in particular, by means of an end face of the spindle by corresponding engagement. A resetting movability is provided by means of a spring loading, for example.

"It is quite particularly advantageous if the tool has an operating device for the spindle and, in particular an end face of the spindle, by means of which, depending on the position of the spindle, it is possible to free and/or block the ability of the counter-region of the clamping jaw to enter the entry region. The tool can thereby be acted on by means of the spindle, as a whole, in order to release or fix it. The spindle can thus be formed in a simplified manner as, for example, no control tube has to be provided on the spindle.

"In particular, a movement or movability of the support device or a part of the support device can be brought about by the operating device. For example, caused by the operating device, the support device as a whole can be displaced by the spindle in order to release a positive connection of the clamping jaw to the loading device of the tool. In another embodiment, a part of the support device is made movable by means of the operating device, controlled by the spindle, for example by a corresponding resilient configuration and release of a counter-support, which allows or facilitates an unthreading of the clamping jaw from a positive connection.

"Advantageously, a standard interface is provided on the spindle for coupling the tool outside the coupling of the at least one rod of the tool to the loading device. This standard interface is, in particular, a hollow-taper-shank interface.

"The following description of preferred embodiments is used, in conjunction with the drawings, for a closer description of the invention."

For more information, see this patent: Rieker, Hartmut; Bayha, Thomas. Spindle/Tool Combination for a Machine Tool.

U.S.
Patent Number 9238268, filed February 8, 2013, and published online on January 19, 2016. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=9238268.PN.&OS=PN/9238268RS=PN/9238268

Keywords for this news article include: MAG IAS GmbH.

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