WO2010049831A2 - Gewindebohrer und werkzeughalter - Google Patents
Gewindebohrer und werkzeughalter Download PDFInfo
- Publication number
- WO2010049831A2 WO2010049831A2 PCT/IB2009/054327 IB2009054327W WO2010049831A2 WO 2010049831 A2 WO2010049831 A2 WO 2010049831A2 IB 2009054327 W IB2009054327 W IB 2009054327W WO 2010049831 A2 WO2010049831 A2 WO 2010049831A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tap
- tool holder
- thread
- machine
- workpiece
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G5/00—Thread-cutting tools; Die-heads
- B23G5/02—Thread-cutting tools; Die-heads without means for adjustment
- B23G5/06—Taps
- B23G5/064—Taps with weakened shank portion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/44—Equipment or accessories specially designed for machines or devices for thread cutting
- B23G1/46—Equipment or accessories specially designed for machines or devices for thread cutting for holding the threading tools
Definitions
- the invention relates to a tap for cutting threads according to the preamble of patent claim 1 and a tool holder for a tap according to the preamble of patent claim 8.
- FIG. 1 shows a conventional tap 1 with a shank 2, a threaded cutting edge 3 arranged at the free end and a clamping face 4 arranged on the shank.
- the clamping surface 4 is here a square at the other end of the shaft 2.
- FIG. 2 such a threaded drill 1 is shown in a prefabricated bore 5 of a metallic workpiece 6 just after a break during tapping.
- the tap 1 breaks at its weakest point 8, i. More or less directly above the thread cutting 3.
- Taps of all kinds for the preparation of screw threads in designated holes are so far designed in the prior art in its mechanical properties that it always during the cutting of a thread in mainly metallic workpieces, and thus during the rotary cutting process itself, overloading the tap again comes to tear breakage of the tap. If such prior art threads are machined with automatic machining centers, lathes, or similar machines, automatic machine feed will typically continue to push the torn-off tapping tool further toward the workpiece with continued rotation, even if the tappet breaks it always comes to major consequential damage to workpiece, tool holder as well as on the machine itself.
- the present invention includes a threaded disconnect clutch, which itself as a tool holder - clamped in the machine - accommodates the tap and an integrated Wellen Operationss- and spring assembly occurring breakaway breakage of the tap the power drive of the respective processing machine in a fraction of a second part from the workpiece, thereby further impacting Subsequent damage to the workpiece, tool holder and machine itself are absolutely avoided.
- the separation of the broken cutting tool parts happens in the threaded disconnect itself in a purely mechanical way without any interference with the most complex machine controls.
- threads in holes provided for this purpose are therefore automatically cut either with so-called machining centers, which have a rotatably abraded tool holder for receiving the tap, which as a rule has the programmable feed of the Machine now rotates the tool holder together with clamped taps on the tightly clamped workpiece, the tap continues to hineinschiebt in the existing hole in the workpiece as it transported after cutting the thread in the rotating backward rotation of the machine again from the now threaded hole out , Or it can be cut in the holes provided in the prior art also automatically with so-called.
- Lathes which have a non-rotating on a feed unit tool holder for receiving the tap, which in turn usually not on the programmable feed of the machine rotating tool holder including clamped tap on a rotatably mounted in the lathe chuck workpiece feeds the tap continues into the existing hole in the rotating drill hole, as it transported after cutting the thread in the rotating backward rotation of the machine again from the now threaded hole out.
- the intended length of thread to be cut is programmed in millimeters over the rotating or non-rotating feed of the machine, both on machining centers and on automatic lathes, as determined in terms of the rotational and feed rate for thread pitch, which values are also permanently programmed in which the tap at the start of the machining process at a certain rotational speed of the tool holder including clamped tap itself or the rotating workpiece via a feed rate suitable for thread pitch and a predetermined thread depth enters the workpiece and at the end of the specified thread depth by automatic return switching of the machine below mathematically equal coordinated return and rotational speeds for thread pitch leaves the workpiece again.
- the tap which is clamped into the rotating or non-rotating tool holder depending on the type of machine, tears, in particular, on the way out during the process Cutting a thread in the designated hole in the workpiece by repeatedly occurring overload on the Materialüberdehungsgrenze of the tap itself, such an occurred breakage of the tap usually not recognized by the machine.
- the cutting action of the tap is abruptly interrupted, causing the tap to stop running into the designated hole but get stuck in place, while the programmed feed of the machine tool forces the tool holder with the clamped other half of the broken tap under great machine feed force.
- timely actuation of the emergency stop switch by a machine operator can help to avoid or at least limit major damage in the event of cutting tool breakage, but not always a machine operator is in immediate proximity to the process and such a crash is usually so rapid that the human body can be damaged Blow on the emergency stop switch is usually already too late.
- the present invention is based on the object, on the one hand to improve a tap of the aforementioned type so that the thread cut off during threading can be removed with little effort and without damaging the already made internal thread, and on the other hand a tool holder for a tool, in particular a tap to indicate which immediately interrupts the feed after a breakage of the tap.
- the tap according to the invention has the great advantage that the tap breaks off at a specific point when the maximum load or torque on the tap is reached shortly before breakage. As a result, most of the shaft of the tap remains in a break and the tap can be easily removed with a suitable tool from the prefabricated internal thread.
- the inventive tool holder for receiving taps has a threaded disconnect and replaces conventional tool holder for taps, and can be used both in rotating tool holder shots of machining centers - even with rotating - and instead of non-rotating tool holder on lathes - in both cases instead of conventional tool holder.
- the new thread breaker can, on a global scale, depending on the mechanical design of its machine flange, on just about any rotating or non-rotating conventional machine for holding taps of all Sizes per size of a Gewindetrennkupplung be used for cutting threads in designated holes.
- a partially hollow housing body as a so-called.
- Tool holder which is closed at its end by means of a machine flange manufactured and arranged according to the prior art.
- Inside the hollow housing body designed a correspondingly arranged Hubursskolben that sits in embedded waveguides between Huburss- and damping springs sitting at its front end on a known tensioning device for receiving any tap according to the respective size of the piston and the Gewindetrennkupplung total itself, and which is pulled out via its embedded shaft guides by rotation of the entire threaded separating coupling itself or by rotation of the workpiece on the thread pitch of a clamped tap within the housing body over a predetermined maximum length of a thread to be cut against his smooth Hubarbeitsfeder-, which is clamped in the piston Taps, independent of the stationary during the working process machine feed into the hole provided in the workpiece, as well as again na ch automatic switching the machine to reverse gear is transported out, which can thus be created in this way a full threading process of any
- FIG. 2 shows the tap of FIG. 1 in a broken off on a workpiece state
- FIG. 4 shows the tap of FIG. 3 in a state broken off on a workpiece
- FIG. 6 shows a perspective view of a tool holder in exploded view
- FIG. 9 shows a cross section through the tool holder according to the plane D-D in FIG. 8.
- FIGS. 3 and 4 show a tap 10 having a shank 12, a thread cutting edge 13 provided at the free end and a clamping surface 14 formed at the other end as a key approach.
- the tap 10 now has immediately below the key approach 14 a predetermined breaking point 15 - also referred to as a separating lock - on, which consists of several V - shaped cuts or annular grooves.
- Anschiessend below the breaking point 15, a further key approach 16 is provided on which a conventional wrench can be attached with the appropriate spanner size.
- FIG 5 the course of the thread cutting process is shown in three different phases, vertically the torque M and horizontally the time t are displayed.
- Diagram A shows the normal course of thread cutting when no problems occur.
- Point 20 is the reversal point, ie when the internal thread has been completed and the tap 1 or 10 is unscrewed from the internal thread 7.
- the diagram B shows the course of the thread cutting process when the tap 1 gets stuck and it comes at the torque peak 21 to break the tap 1 at the weakest point 8.
- the diagram C now shows the termination of the thread cutting process with the tap 10, which takes place at time 22, ie when the predetermined breaking point 15 breaks.
- the predetermined breaking point 15 is designed so that it breaks at a torque of about 97% of the maximum torque at break of a normal tap 1.
- the value of the torque is measured at the material overstretching limit during tapping, and this measured value is used as the basis for the design of the predetermined breaking point 15.
- the tap 10 is made of a hardened tool steel, but could be made of other suitable hard metals.
- the tap 10 prior to hardening, could also be provided with a thin blind hole in the longitudinal direction in which a suitable metal rod has been inserted, and the tap can be hardened with the metal rod, as a result of which the tap acquires increased hardness.
- FIG. 6 now shows a tool holder 31 with a coupling housing 32, a clamping means or coupling piston 33 with four surrounding bearing shafts 34 and a drive shaft or receiving closure 35 for a tap.
- the bearing shafts or guide rods 34 are held on the one hand in boreholes 36 at the tapered end 37 of the coupling housing 32 and on the other hand in boreholes 38 of the receiving closure 35 when the receiving closure is screwed by means of screws 39 on the coupling housing 32.
- the clutch piston 33 has a star-shaped stop 40 on the receiving closure facing the end, which is provided with four through holes 41, in each of which a ring shaft bearing 42 is arranged, which surround the bearing shafts 34 and thus allow axial movement of the clutch piston 33.
- the clutch piston 33 also has a stroke stop 44, which is mounted on the clutch piston 33 pushed against the annular or star-shaped stop.
- a piston shaft bearing 45 is further provided in the tapered end 37 in the axis of the clutch housing 32, in which the clutch piston 33 is mounted axially movable.
- the bearing shafts 34 are each surrounded by a compression spring 46, which press on the one hand against the conical end 37 of the coupling housing 2 and on the other hand against the star-shaped stop 40 of the clutch piston 33.
- a compression spring 47 is provided on the clutch piston 33 between the piston shaft bearing 45 and the star-shaped stopper 40. Between the stopper 40 and the receiving closure 35, a damping spring 48 is arranged, which the Backlash of the clutch piston 33 when a tap breaks.
- FIGS. 7 and 8 show a cross-section in the longitudinal direction of the tool holder, FIG. 7 showing the rest position, FIG. at the start of drilling, and Figure 8 shows the end position, i. when the threaded hole has been completed.
- a piston-cylinder arrangement may be provided, in which the tool holder is arranged on the piston, and the cylinder is fastened to the receiving closure.
- the cylinder also has longitudinal guides for the piston, so that the rotation of the cylinder can be transmitted to the piston.
- the working with the new Gewindetrennkupplung the desired to be cut thread length is no longer programmed in path length of the machine feed to the depth of thread to be achieved, but converted into number of tool or workpiece revolutions to the thread pitch of the clamped tap and specified as such the machine, as the machine feed during the actual threading process resting with the new threaded disconnect.
- the machine feed transports the tap, which is clamped in the reciprocating piston, together with the thread breaker to 1 millimeter at rapid traverse in front of the borehole in the workpiece, into which the thread is to be cut, and stops there for a moment.
- the processing machine switches the rapid feed to a slower operation and pushes the rotating Gewindetrenn-coupling on the stationary, or the non-rotating Gewindetrennkupplung on the rotating workpiece (per machine) with the clamped taps another 2 millimeters, whereupon the tap at this moment of here given overfeed of 1 millimeter length bites the first thread in the workpiece and begins to be pulled in rotation over the spring assemblies and shaft guides of the Hubarbeitskolbens the Gewindetrennkupplung in the workpiece from its spring storage inside out.
- the machine feed retracts the given 2 millimeters feed and overfeed by precisely these 2 millimeters, whereby the taps, which now work themselves automatically into the borehole of the workpiece, are free again at their original starting position 1 millimeter in front of the borehole would and will be located later. In this position, the machine feed stops. Indifferences from the actual thread pitch of the clamped tap for any feed rate of the machine during the given momentary overfeed of 1 millimeter in length when the tap of the tap on the first to be separated thread in the workpiece are in this short Working moment of the arranged in the Gewindetrennkupplung at the rear end of the Hubarbeitskolbens damper spring elastically balanced.
- the number of thread turns to be cut predetermined for the processing machine now determines, converted into path length, the thread depth to be achieved and the changeover time of the rotation of the processing machine to reverse revolutions of the same predetermined amount of revolution. (This is independent of the rotational speed of the machine, which only specifies the tool and workpiece compatible operating speed.)
- the processing machine switches on Reverse rotation, whereby the tap again leaves the thread cut into the borehole in the same way and again retracts in the direction of the threaded separating coupling via its Hubarbeitskolben arranged in the Gewindetrennkupplung and embedded in the spring assemblies and shaft guides.
- the tap leaves the last millimeter of the return path to the original zero point of the Hubarbeitskolbens (starting position taps 1 millimeter before the borehole standing) on the spring assemblies in the Gewindetrennkupplung by their mechanically fixed adjusted retraction force of the piston.
- An additionally programmed multi-turn of the rotating machine part ensures the safe exit of the borehole by the tap after completion of the tap and gives the machine the next control command, now the machine-side feed arranged tool holder receptacle including clamped threaded disconnect to haul away in rapid traverse for any subsequent, next operation.
- the feed and overfeed travel of 1 millimeter, referred to at the beginning of the tapping process, are relative values per size of a respective thread breaker. Coupling and each size of each matching the size of a Gewindetrennkupplung taps.
- the feed values mentioned here of a total of 2 millimeters - 1 millimeter to the workpiece and 1 further millimeter overfeed to the bite of the tap in borehole - roughly correspond to tappets of size M6 to M8 and each thread pitch from here eg 1, 5.
- Larger taps of M20 for example, need a larger overfeed for the first bite of the tap in the borehole on a corresponding threaded disconnect coupling, smaller taps of eg M2 require a corresponding smaller bite feed torque.
- the damping springs are analogous to the construction large such Gewindetrennkupplitch course in the relation smaller or larger designed with appropriate damping power.
- the actual machine feed of the machine tool using the newly invented thread breaker during such breakage is at a standstill, and thus any further damage to the workpiece, tool holder or even on the machine itself with the utmost security avoided because of the new threaded disconnect nothing more connects the broken in the Gewindetrennkupplung drill part with the workpiece and no feed rate is present.
- the maximum Hubarbeitsweg the Hubarbeitskolbens in a Gewindetrennkupplung corresponding size is always designed at least 3.5 times the value corresponding to the respective Gewindetrennkupplung corresponding threaded drill, a respective Gewindetrennkupplplungstyp its size several different to match the threaded tap suitable tap sizes is capable.
- the at least 3.5 times the lifting power of the reciprocating piston always corresponds to the diameter of the largest in a Gewindetrennkupplung corresponding size tap included, whereby any known in the art usually known requirements for cutting thread to be cut in any workpieces of the working force of a Gewindetrennkupplung always be met ,
- larger thread depths can also be achieved by using correspondingly longer thread disconnect couplings with the reinvention.
- the new thread breaker is widely used in machine and tool making as well as in related fields, where cutting threads into valuable workpieces such as valuable machinery seeks to prevent damage from tapping.
- the Gewindetrennkupplung will settle in the serial production in the price structure of other conventional and thus approximately comparable tool holder, perhaps a little more expensive, but has the interesting property, their purchase price analogous to known in companies and usually monthly occurring damage due to tapping failure in only very a short time to pay for themselves by eliminating such considerable amounts of damage.
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Abstract
Description
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Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008049902.1 | 2008-10-04 | ||
DE102008049902 | 2008-10-04 | ||
DE200810061768 DE102008061768A1 (de) | 2008-12-14 | 2008-12-14 | Werkzeughalter für eine Bohrmaschine, einen Drehauautomaten oder ein Bearbeitungscenter |
DE102008061768.7 | 2008-12-14 |
Publications (2)
Publication Number | Publication Date |
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WO2010049831A2 true WO2010049831A2 (de) | 2010-05-06 |
WO2010049831A3 WO2010049831A3 (de) | 2010-12-09 |
Family
ID=42129379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/IB2009/054327 WO2010049831A2 (de) | 2008-10-04 | 2009-10-02 | Gewindebohrer und werkzeughalter |
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WO (1) | WO2010049831A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113634828A (zh) * | 2021-08-24 | 2021-11-12 | 常州恒鼎工具制造有限公司 | 一种用于丝锥攻丝用的平衡夹具及其使用方法 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060060031A1 (en) | 2004-09-23 | 2006-03-23 | Ron Morris | Broken bolt extractor apparatus and method |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2101347A (en) * | 1936-06-24 | 1937-12-07 | Willard C Robinette | Tap |
US3458882A (en) * | 1967-03-27 | 1969-08-05 | Gerald W Kelly | Thread-cutting device |
DE20001825U1 (de) * | 2000-02-02 | 2000-05-04 | Liu Lien Huang | Schneidwerkzeug |
-
2009
- 2009-10-02 WO PCT/IB2009/054327 patent/WO2010049831A2/de active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060060031A1 (en) | 2004-09-23 | 2006-03-23 | Ron Morris | Broken bolt extractor apparatus and method |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113634828A (zh) * | 2021-08-24 | 2021-11-12 | 常州恒鼎工具制造有限公司 | 一种用于丝锥攻丝用的平衡夹具及其使用方法 |
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Publication number | Publication date |
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WO2010049831A3 (de) | 2010-12-09 |
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