DE8032783U1 - LINING FOR PARTICULAR DRILLING TOOLS - Google Patents

Description

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I Il t Scratch Mülbergerstrasse 65 ' DipT.-Ing. Volkhard Kratzsch Schulz D-7300 Esslingen Dipl.-Ing. Klaus Schulz Telephone Stuttgart (0711) 35 99 92 Deutsche Bank Esslingen 210906 \ Ci -. D- "· - · ■ '■ cable «krapatent» esslingenneckar Post office Stuttgart 10004-701

Otto BiIz, tool factory December 3, 19B0

Ostfildern 2. Lawyer File 3175-A

Chuck for drilling tools in particular

The invention relates to a chuck for particularly drilling tools, with the rest of the preamble of the claim 1 defined features.

Such a chuck is preferred as a quick-change chuck designed to accommodate drills, taps, etc., with the chuck either being set up that way. that the drilling tools be taken up directly in the chuck, or that the drilling tools are clamped by means of a special quick-change insert which in turn is quickly and easily absorbed in the feed. This design is known from CUS-PS 37 23 01-40 90 802). The torque coupling device is, for example, an axial safety coupling that responds to compressive forces and tensile forces designed. If the set feed force is exceeded, this safety coupling responds and separates the drive of the sleeve from the shaft, which is still driven on the machine side, so that damage, in particular breakage of the drilling tool is prevented, as well as impairment or destruction of the workpiece. In the Drilling, it happens at time intervals that the drilling tool becomes blunt in the course of the machining and therefore no longer cuts or that for some reason the

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Hole is not drilled deep enough, be it by diminished Cutting force of the drilling tool or due to chip clogging in the borehole or the like. The then occurring Response of the safety coupling is indicated by the integrated high-frequency transmission device; because then the switch of the high-frequency transmitter is closed, so that the circuit is now closed a high-frequency output signal is generated and emitted via the outer antenna ring of the feed. The high frequency signal can be in the order of e.g. preferably 20-1G0 MHz. This output signal is provided by a assigned high-frequency receiver contactless and wireless received and processed there to a signal, so that when monitoring the machine tool and the machining process it can be determined that the safety clutch has responded with the chuck in question and there is a defect. The explained lining also has a sliding ring on the outside, which is caused by the relative displacement is shifted between the shaft and the sleeve when the safety clutch responds, so that you can then look at of the chuck can also recognize from the outside that the safety clutch has responded and to what extent the Hole depth has not been completely created.

The well-known feed of the type described has proven itself well, especially with multi-spindle drilling machines, in which a large number of individual spindles each with one Chuck from a common machine-side drive, are driven. With regard to the high-frequency transmission device, however, it has been shown that this device is very susceptible to failure due to the penetration of moisture into the interior of the feed, so that false signals or other Faults as well as complete failures are the result - The reliability is thereby endangered to a high degree.

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Moisture can penetrate the feed interior at several points, for example on the feed probe that is accommodated in the area of the machine-side spindle. The penetration of air and moisture is unavoidable there. In addition, it is known that cooling emulsions and lubricating liquids are used in machining. These liquids tend to penetrate through the smallest openings and slits in the food. Moisture from the outside can also penetrate the inside of the lining along the length of the lining that is accessible. Since the shaft and the sleeve are relatively axially displaceable, that a gliding motility is given between two and g ^e must enter ", are given by House of slits and gaps, can penetrate through the moisture and liquid inevitably in the lining inside. When axial collapse ^ Pressing the shaft and sleeve when the safety coupling responds, the air inside is compressed. The system is therefore similar to a gas spring. This design also allows air to be exchanged from the inside of the lining to the outside and vice versa, which is also possible Moisture get inside the feed.

The invention has for its object to provide a lining of the to create the genus defined in the preamble of claim 1, which lent a high degree of reliability the high-frequency transmission device guaranteed and with the simplest possible means as good as possible Completion of the interior of the feed, at least the interior in which the sensitive parts of the high-frequency transmission device are included, is reached.

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In the case of a chuck, this task is the one described in the umbrella term of The genus defined in claim 1 is solved according to the invention by the features in the characterizing part of claim 1.

The moisture-tight, hermetic encapsulation of the Interior of the shaft, which is the high-frequency transmitter with all sensitive parts contains, namely by sealing this interior space in the axial direction, it is ensured that in this interior space and too no moisture can get into the sensitive parts of the high-frequency transmitter. This interior takes Also, the air contained in the compression does not participate when the safety clutch responds and when it is pushed into one another of shaft and sleeve. Due to the moisture-proof, hermetic encapsulation of the antenna ring its entire exterior is also guaranteed here that neither liquid nor other moisture has access, which could otherwise cause false signals. In addition, the design is particularly simple and therefore relatively inexpensive.

A particularly advantageous embodiment results from claim 2. A hermetic encapsulation of the antenna ring by casting resin around it is mostly preferred.

Further advantageous designs emerge from claims 3 and 4. As a result, on the one hand, there is the high-frequency transmission device The interior space containing it is accessible, e.g. to replace the battery block with a new one to be able to. On the other hand, with closure by the closure cap with sealing washer or sealing ring is an absolute Closure secured and the ingress of any moisture blocked.

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Another, particularly advantageous embodiment contains claim 5, with advantageous developments according to the Claims B and 7. This also axial encapsulation at the other end of the cavity inside the shaft the cover, preferably a membrane, also ensures an absolutely tight seal at this end of the cavity, which is also relatively simple and inexpensive to construct. Nevertheless, an application of the switch is the High frequency transmitter possible thanks to the movable one speed of the cover between the actable part of the switch in the encapsulated interior and an outer one Switching part represents a sealing separating layer.

Further advantageous measures emerge from the following claims 8-13. They are particularly advantageous Embodiments according to claims 14-19. The beyond of the encapsulated interior is the switch pin with regard to its protrusion dimension measured in the axial direction adjustable, whereby the switching point of the switch can be set very precisely with simple means. The measure according to claim 20 is also advantageous. The overstroke spring takes an overstroke when the switch is applied until the mechanical stop is reached and at the same time provides permanent electrical contact safe, on the one hand between battery black and high frequency transmitter and on the other hand between the latter and the electrically conductive housing of the switch.

Further details and advantages emerge from the following description.

The complete wording of the claims is not given above solely to avoid unnecessary repetition reproduced, but instead only referred to by naming the claim number, whereby however, all of these claim features than on this one

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Place expressly and essential to the invention disclosed have to apply.

The invention is based on one in the drawing Illustrated embodiment explained in more detail, which is a schematic, axial longitudinal section of a chuck for in particular Shows drilling tools.

The chuck has a shaft 10, which in the upper part 11 is designed as an adjusting sleeve with an inner cavity 12, which is in the usual way within an indicated machine spindle 13 is recordable. An adjusting nut 14 is seated on the adjusting sleeve 11. The adjusting sleeve 11 of the shaft 10 closes In one piece, a lower part 15, which also contains an inner cavity 16 and is immersed in a sleeve 17, is attached. The design of this chuck corresponds, for example, to that according to US Pat. No. 4,090,802. The sleeve 17 is used at the lower end for either the direct mounting of the tool, not shown further, e.g. a tap, or for mounting a not shown, also known quick-change insert, which in turn contains the tool, e.g. a tap.

The shaft 10 driven by the machine spindle 13 is coupled to the sleeve 17 via an adjustable torque coupling device 18 of a known type, which in the event of an overload automatically separates with axial relative displacement of shaft 10 and sleeve 17. The sleeve 17 is further on Shank 10 pushed on.

A radio frequency transmitter is also located inside the chuck 19 included, which serves the same purpose as that according to US-PS 40 90 802. When the torque clutch device responds 18 by separating in the high-

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q frequency transmission device 19, an electric circuit closed cool, so that a high-frequency signal generated and given off $, which is not shown further from a, fi stationarily arranged high-frequency receiver is received and ρ can be evaluated. In this way, when the torque clutch device 1B responds, a signal is generated. The torque coupling device

p 18 serves as a safety device. She speaks at over-

a set feed force is reached, which e.g. if the drill is blunt or if the holes are not drilled deep enough or if the drill holes are blocked by chips or the like the case is. The activation of this safety device prevents the drilling tool from breaking. The simultaneous generation of the high-frequency signal makes this safety device respond signals.

The high-frequency transmission device 19 has its own power source a battery block 20 in the cavity 12, also a radio frequency transmitter 21 in the cavity 12, also one at the axial relative movement between shaft 10 and sleeve 17 closable switch 22 in the power supply circuit of the high-frequency transmitter 21 and also an outer antenna ring 23.

When the torque clutch device 1B and further pushing the sleeve 17 onto the shaft 10, air contained in the interior of both parts is compressed, the strives to escape to the outside. When moving back, ambient air tries to get inside penetrate. It has therefore been shown that with known fut-. ■ -: tern of the type described so far moisture mainly to the individual components of the high-frequency transmission device 19 can reach, which can then lead to false signals or complete failure.

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To avoid moisture ingress, this is the high frequency sensor -device 19 with all components in the cavity 12 enthf tend shaft 10 with a moisture-proof Hermetic encapsulation is provided at both axial end regions of the high-frequency transmission device 19. Also is the antenna ring 23 seated on the shaft 10 also has a moisture-proof, hermetically sealed. The antenna ring 23 is seated through the intermediary of an insulating ring 24 the shaft 10. As a moisture-proof, hermetic enclosure is the antenna ring 23 on its entire exterior with plastic, preferably cast resin, in the form of visible outer layer 25 encapsulated. In this way there is a completely hermetic seal at this critical point created and prevents any penetration of moisture.

At the upper end in the drawing is the cavity 12 of the shaft 10 by means of a closure cap 26, in particular in the form of a screw plug, which has a sealing ring 27 or a sealing washer for sealing there wearing. The sealing ring 27 or the sealing washer is on the facing surfaces of the closure cap 26 on the one hand and the shaft end on the other hand sealingly so that there, too, the ingress of moisture is reliably prevented. At an axial distance from it and from the overarching one At the end of the sleeve 17, the inner cavity 12 of the shaft 10 is also axially hermetic and liquid-tight encapsulated. This is done by means of a movable cover 28, which is preferably tightly clamped at the edge Membrane is executed. The cover 28 is designed as a body of revolution., In the axial longitudinal section about M-shape. Its outer ring section lies with its outer circumferential surface on the inner boundary wall of the cavity 16 of the lower part 15 of the shaft 10 at. With an axial face this is. Ring section

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pressed against an inner annular shoulder 29 in the shaft 10 in a sealing manner. For this purpose is on the cover 28 from A pressure plate 30 is attached to the outside of the encapsulated cavity 12. This is in the form of a pressure spring 31 acted upon by a cylindrical helical spring, which extends in the interior 16 of the shaft 10 and the sleeve 17 and with its one end that the pressure plate 30 faces away, is axially supported on the sleeve 17.

The switch 22 contained in the cavity 12 of the shaft 10 consists of a mechanically operating microswitch with an axial switch plunger made of insulating material 32. The switch 22 is located near the end cover 28 and is arranged so that its switch plunger 32 rests against the cover 28 with its free front end.

The housing of the switch 22 is made of electrically conductor the material. It is in an insulating bushing 33 in the hollow space 12 added. As a result, the switch housing is isolated from the shaft 10 against a short circuit. The insulating bush 33 contains an inside in the area of the jack 32 Antenna socket 34 made of electrically conductive material. With the latter, the housing of the switch 22 is with axial Contact surfaces kept in electrically conductive contact. As can be seen, only small frontal areas of the Housing of the switch 22 come into contact with the end face of the antenna socket 34. To even if yourself there should be small gaps and incorrect timing, but a reliable Kantaktgabe to secure, iot between the housing of the switch 22 and the antenna socket 34 according to a compression spring 35 in the form of a arranged cylindrical coil spring, which consists of electr conductive material.

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The antenna socket 34 is provided in the center with a guide hole 3B, which is from the switch plunger 32 of the switch 22 is interspersed.

The outer antenna ring 23 is radial by means of, for example, three Screws 37 fixed from electrically conductive material. Each screw 37 penetrates an associated radial bore 38 in the shaft 10, which is lined with an insulating bush 39. At the end of each screw 37 extends into the antenna socket 34, so that the conductive connection there from the antenna socket 34 to the antenna ring 23 is made.

The high-frequency transmission device 19 also has two indicated resilient contact tongues 40, 41, one of which may also be sufficient. The contact tongues 40, 41 are located to draw current on the inner wall of the cavity 12, which is nickel-plated to increase the contact or can be chrome-plated. When the switch 22 is closed, a current flows from the battery block 20 via the cap 26, the shaft 10, the contact tongues 40, 41 to the high-frequency transmission device 19 and from there back to the battery block 20. A high-frequency signal is generated, and through the Antenna ring 23 radiated to the outside.

A switch pin 51 is assigned to the switch 22 and is located in the cavity 16 of the shaft 10. The shift bolt 51 is supported opposite the sleeve 17 and with its pin end facing the cover 28 and to act on the switch 22 via the cover 28. acts on the switch plunger 32, guided in the pressure plate 30. In the state shown, in which the switch 22 is not is closed, the free end of the switching pin 51 has a predetermined distance from the cover 28. The Switching pin 51 carries a radial stop shoulder 52, for example a ring integral therewith, which in the predetermined Distance from the free end of the shift pin 51

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is arranged and to limit the axial switch actuation stroke strikes on the pressure plate Br 30. The switching pin 51 is provided with thread 53 and with respect to its axial protrusion can be adjusted to a threaded position by setting the switching point of the switch 22 54 provided receptacle 55 is screwed in. To secure the screwed-in position, the switch pin 51 carries on his Threaded shoulder 53 a lock nut 56.

In the shaft 10 and in the sleeve 17 there is a telescope sleeve which consists of two individual sleeve elements, of which the upper sleeve element forms the receptacle 55 and can be telescoped into a lower sleeve element 57. Both sleeve elements 55 and 57 are means an axial compression spring 58 is forced into its extended position. The compression spring 31, which acts on the pressure plate 30, is supported with its opposite end on a foot flange 59 of the lower sleeve element 57. The foot flange 59 in turn sits on a bathing wall BO in the sleeve 17.

In the cavity 12 of the shaft 10 there is also an axial overtravel spring 61 is arranged, which rests with its upper end on an end-face contact surface of the battery block 20 and is held at its opposite end in electrically conductive contact with a contact surface 62 of the high-frequency transmission device 19. The overtravel spring 61 takes the axial overstroke, which occurs with the relative displacement of the switching pin 51 after the switch is closed until it is reached the position is passed through in which the stop shoulder 52 to limit the further stroke on the pressure plate 30 strikes.

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If, for example, the torque decoupling device should break the drilling tool 18 responds and the rotary drive of the sleeve which has so far been effected via the driven shaft 1Ü 17 interrupts, there is an axial relative displacement between shaft 10 and sleeve 17 such that the Shank 10 dips deeper into sleeve 17. Then, the switch pin 51 pushes through the elastic cover 2B axially against the switch plunger 32 until the switch 22 is closed. Then is the circuit of the radio frequency transmitter 19 closed. A high-frequency signal is emitted via the antenna ring 23. With further downward movement of the shaft 10, the overtravel spring 61 is slightly compressed, the resulting stroke receives and at the same time ensures that the high frequency transmitting device 19 with its lower end in the drawing is still in electrically conductive contact with the housing of the switch 22 remains and this in turn reinforced by the compression spring 35 in electrically conductive contact with the antenna socket 34 remains. With further axial movement, the stop shoulder 52 hits the pressure plate 30, so that now the switching contacts of the switch-22 relieved and do not have to absorb any further overtravel force.

The simple and extremely reliable design with a moisture-tight, hermetic one is of particular advantage Encapsulation of the entire interior space in which the high-frequency transmitter 19 is located, including the outer encapsulation of the antenna ring 23. It is thus ensured that moisture cannot penetrate the could lead to incorrect signaling or even complete destruction. This gives a high level of reliability and permanent operational readiness guaranteed. The adjustability of the switching pin 51 makes it possible to set the switching point for the switch 22 sensitively and precisely can, and this with extremely simple means. This is when the shaft 10 and the sleeve are pushed into one another relative to one another

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Volume to be compressed or even completely displaced is extremely small. It is given by the air space between the cover 28 on the one hand and the Front end of the antenna socket 34 on the other hand is enclosed.

Claims (19)

Patent attorneys • f * · * • · I t
• * * « Scratch Mülbergerstrasse 65 Dlpl.-Ing. Volkhard Kratzsch Schulz D-7300 Esslingen Dipl.-Ing. Klaus Schulz NcWO flii ViUiTV, IWf. Telephone Stuttgart (0711) 35 99 92 Deutsche Bank Esslingen 210906 [07 "\ I) ^ i ■" · ■■■ "' cable «krapatent» esslingenneckar Post office Stuttgart 10004-701 Otto BiIz, tool factory, December 3, 1980 7302 Ostfildern 2. Lawyer File 3175-A !; ' Protection claims I 1. Chuck for drilling tools in particular, with an inside I hollow shaft that can be received in a machine spindle ff is, and with a sleeve that is used to accommodate a quick Interchangeable insert with the tool or directly from the tool is set up and with the shaft via an adjustable 1 bare, in the event of overload, automatically under axial relative 1 . Shifting of the shaft and sleeve separating torque couplings treatment device is coupled, and with a high frequency ^ t transmitter with its own power source, high-frequency r transmitter, one in the axial relative movement between κ Shaft and sleeve lockable switch in the power supply ki supply circuit of the high-frequency transmitter and an external !. ' Antenna ring, characterized by H a moisture-tight, hermetic enclosure of the ji the high-frequency transmission device (19) with all parts H (20-22) in the hollow interior (12) containing shaft j- at both axial end areas of the high-frequency transmission I device (19) and on the shaft (10) seated antenna ring (23) on its entire exterior, 2. Feed according to claim 1, characterized in that that the antenna ring (23) with the mediation of an insulating ring (24) on the shaft (10) sits on and acts as a moisture-proof, hermetic enclosure on its exterior with plastic (25), preferably cast resin, is encapsulated. 3. Feed according to claim 1 or 2, characterized in that g e e: t that the inner cavity (12) of the shaft (10) at the end facing away from the sleeve (17) is a sealing cap by means of a sealing washer or sealing ring (27), in particular an O-ring (26), preferably screw plug. 4. Chuck according to claim 3, characterized in that the sealing disc or the sealing ring (27) rests in a sealing manner on axial, mutually facing surfaces of the shaft (10) and the closure cap (26). 5. Feed according to one of claims 1 - 4, d a d u r c h characterized in that the inner cavity (12) of the shaft (10) in an area arranged at an axial distance from the free end of the sleeve by means of a movable area Cover (26), preferably by means of a membrane tightly clamped at the edge, axially hermetically is encapsulated. 6. Lining according to claim 5, characterized in that the cover (26) aass as a rotational body, which has approximately a PI shape in longitudinal section is, the outer ring portion of which rests with its outer circumferential surface on the inner boundary wall of the cavity (16) and with an axial The end face is pressed sealingly against an inner annular shoulder (29) in the shaft (10). -3- 7. Feed according to claim 6, characterized in that that on the cover (2B) from the outside of the encapsulated cavity (12) a pressure plate (30), which is acted upon by a compression spring (31) which is located inside the shaft (10) as well as the sleeve (17) and with its end facing away from the pressure plate (30) axially on the sleeve (17) is supported. 8. Feed according to one of claims 5 -7, characterized characterized in that the inside (12) the switch (22) contained in the shaft (10) as a mechanical microswitch with an axial switch plunger (32) is formed, wherein the switch (22) is arranged close to the axial cover (28) and in such a way that the switch plunger (32) rests with its free front end on the cover (28). 9. Chuck according to claim 8, characterized in that the switch housing is made of electrical conductive material and in an insulating sleeve (33) is received in the cavity (12) of the shaft (10) and that the insulating sleeve (33) in the Area of the switch plunger (32) contains an antenna socket (34) made of electrically conductive material, with which the switch housing is held in electrically conductive contact with axial contact surfaces. 10. Feed according to claim 9, characterized in that that between the switch housing and the antenna socket (34) an electrically conductive compression spring (35) is arranged. -4- 11. Feed according to claim 9 or 10, characterized in that that the antenna socket (34) in the center has a guide bore (3B) which is penetrated by the switch plunger (32) formed from insulating material to guide it. 12. Feed according to one of claims 1-11, characterized characterized in that the antenna ring (23) by means of radial screws (37) made of electrically conductive material, which are lined with insulating bushes (39) Pass through the radial bores (38) of the shaft (10) and at the end into the antenna socket (34) reach in, is fixed. 13. Feed according to one of claims 1 - 12, characterized characterized in that the radio frequency transmitter (19) has at least one resilient contact tongue (40, 41) which is used to draw power from. Shank (10) on the inner boundary wall of its cavity (12), which is preferably used to increase the Contact line is nickel-plated or chrome-plated. 14. Feed according to one of claims 1-13, g e k e η η is characterized by a switch pin (51) arranged in the interior (16) of the shaft (10), which in the sleeve (17) is supported and with its bolt end facing the cover (28) and for Actuation of the switch via the cover (28) acts on the switch plunger. (32) acts on the pressure plate (30) is penetrated and guided in it. -5- 15. Feed according to claim 14, characterized in that that the switching pin (51.) has a radial stop shoulder (52), for example a ring, which in specified distance from the free end of the shell bolt (51) is arranged and to limit the axial switch actuation stroke on the pressure plate (30) strikes. f | 16. Feed according to claim 14 or 15, characterized in that that the switch (51.) S provided with a thread (53) and with regard to his axial protrusion while setting the switching point of the switch (22) is adjustably screwed into a receptacle (55). 17. Chuck according to claim 16, characterized in that the switching beam (51) on his Threaded shoulder (53) carries a lock nut (56). 18. Feed according to one of claims 1 to 17, characterized marked that in the shaft (TO) and a telescopic sleeve (55 ', 57) contained in the sleeve (17) whose individual sleeve elements (55, 57) are pushed out into their by means of an axial compression spring (58) Position, which is a switch j | (22) facing sleeve element (55) with internal thread (54) is provided and carries the switching pin (51) screwed into it. 19. Feed according to one of claims 7-18, characterized marked that the Pruckt'eller (30). acting compression spring (31) with its opposite End on a foot flange (59) of the telescopic sleeve (55, 57) is supported on a bottom wall (BQ) is seated in the sleeve (17). -B- Chuck according to one of Claims 1 to 19, characterized by an axial overtravel spring (61] in the cavity (12) of the shaft (10), which with one end at an end contact surface of the Power source (20), in particular a battery, is applied and its other end is electrically conductive Contact with a contact surface (62) of the High frequency transmitter (19) is held.