SE511097C2

SE511097C2 - Hydromechanical mandrel

Info

Publication number: SE511097C2
Application number: SE9700238A
Authority: SE
Inventors: Anders Samelius
Original assignee: Etp Transmission Ab
Priority date: 1997-01-28
Filing date: 1997-01-28
Publication date: 1999-08-02
Also published as: SE9700238D0; WO1998032560A1; SE9700238L; JP2001509091A; EP0956176A2

Abstract

A hydromechanical mandrel, preferably intended to be mounted, with one end (2) thereof, in a rotary machine tool, and to releasably carry, with the opposite end (3) thereof, one or more tools (4) of the type having an axial central bore, and in which apparatus said opposite end, named the mandrel pin (3), is formed with a smooth outer surface and so that one or more tools (4) can be slided ontosame, and can be secured, on the outer surface of the mandrel, and whereby the mandrel pin (3) is formed as a hydromechanical clamp bushing comprising a sleeve (8) which is formed integral with the mandrel and which has a relatively thin, radially expandable wall and an inner surface (11) which is slightly widened in the direction towards the free end of the sleeve (8), and a piston (9) which is axially displaceable in said sleeve (8) and which has the same conical shape (12) as that of the inner surface (11) of the sleeve (8), and in which the mandrel further comprises means for hydraulic pressurization of a pressure chamber (13) at the outer end of the sleeve (8) thereby forcing the piston (9) inwards in the sleeve (8) by means of a hydraulic pressure medium, and means at the opposite end for pressurization of a release pressure chamber (15) thereby forcing the piston (9) back to its initial position.

Description

10 15 20 25 30 511 097 spara denna med vidhängande verktyg för förnyad användning av samma dorn med vidhängande verktyg. 10 15 20 25 30 511 097 save this with attached tools for reuse of the same mandrel with attached tools.

Monteringen av verktyg på dornen sker genom att det först tillses att kolven 9 befinner sig i helt återfört läge; ett eller flera verktyg 4 skjuts på dorntappen 3, och i förekommande fall med medbringartapparna 7 införda i medbringarhålen 6 i dornhuvudets fläns; tryckmedium införs med ett i förväg fastställt tryck i tryckkammaren 13 genom bottennippeln 10, varvid verktygen 4 centreras, balanseras och fixeras på dorntappen.The mounting of tools on the mandrel is done by first making sure that the piston 9 is in the fully returned position; one or more tools 4 are pushed on mandrel pin 3, and if applicable with the carrier pins 7 inserted in the carrier holes 6 in the flange of the mandrel head; pressure medium is introduced with one in advance determined pressure in the pressure chamber 13 through the bottom nipple 10, wherein the tools 4 are centered, balanced and fixed on the mandrel pin.

Lösgöring av verktygen 4 sker genom att tryckkammaren 13 evakueras, och returtryckkammaren 15 trycksätts, så att kolven 9 återförs till sitt ursprungsläge, varvid hylsan 8 tryckavlastas och verktygen 4 lösgörs från dorntappen 3.Loosening of the tools 4 takes place by the pressure chamber 13 is evacuated, and the return pressure chamber 15 is pressurized so that the piston 9 is returned to its original position, whereby the sleeve 8 is depressurized and the tools 4 are detached from mandrel pin 3.

Det bör påpekas kamrarna 13 och 15 vid drift inte är trycksatta utan att fastlåsningen av verktyget eller verktygen är helt mekanisk. Den hydrauliska trycksättningen används endast vid montering och demontering av verktyget.It should be noted that the chambers 13 and 15 during operation are not pressurized but that the locking of the tool or tools is completely mechanical. The hydraulic pressurization is only used during assembly and disassembly of the tool.

HÄNVISNINGSSIFFROR 1 övergångsparti 2 dornkona 3 dorntapp 4 verktyg 5 fläns 6 medbringarhål (i flänsen) 7 medbringartapp 8 hylsa 9 kolv 10 trycknippel 1 1 konyta (hos hylsan 8) 12 konyta (hos kolven 9) 1 3 tryckkammare 14 tryckmedieanslutning 1 5 returtryckkammare 10 15 20 25 30 35 3 511 097 verktyget. Alternativt kan verktygen vara utformade med genomgående hål genom vilka spännskruvar kan föras in och gängas in flänsens 5 hål 6.REFERENCE FIGURES 1 transition party 2 dornkona 3 mandrels 4 tools 5 flange 6 carrier holes (in the flange) 7 carrier pin 8 sleeve 9 pistons 10 pressure nipples 1 1 cone surface (with sleeve 8) 12 cone (with piston 9) 1 3 pressure chamber 14 print media connection 1 5 return pressure chamber 10 15 20 25 30 35 3 511 097 the tool. Alternatively, the tools can be designed with through holes through which clamping screws can be inserted and threaded into the hole 6 of the flange 5.

Vidare kan, i stället för hål 6 respektive tappar 7, vridstyvhet uppnås medelst i sig kända kil- eller pinnförband. Vidare kan, om så önskas, hylsor av olika typer införas mellan verktyget 4 och hylsan 8.Furthermore, instead of holes 6 and pins 7, respectively, torsional rigidity can be achieved by means of wedge or pin joints known per se. Furthermore, if desired, sleeves can be removed different types are inserted between the tool 4 and the sleeve 8.

Dorntappen 3 är utformad som en hydromekanisk konkolvsbussning, och den är för ändamålet utformad med två huvuddelar, nämligen en hylsa 8 som är fast förbunden med domen, och som har en så relativt tunn yttervägg, att den har möjlighet att expandera radiellt vid påverkan inifrån, och en inuti hylsan 8 förskjutbar kolv 9. Hylsan 8 är tillsluten i sin fria ände, t ex med hjälp av en gängad nippel 10. Hylsan 8 har en inneryta 1 1 som vidgar sig svagt koniskt i riktning utåt från övergångspartiet 1, och kolven 9 har en på motsvarande sätt konformad ytteryta 12. Koniciteten i hylsan 8 och i kolven 9 är sådan att kolven är självlåsande i varje förskjutningsläge i hylsan. Hylsans och kolvens konytor 11 och 12 ger en inbördes tätning, och kolven har sådan form att den i avspänt läge befinner sig nära nippeln 10.The mandrel pin 3 is designed as a hydromechanical concave bushing, and it is for the purpose designed with two main parts, namely a sleeve 8 which is firmly connected with the judgment, and which has such a relatively thin outer wall, that it has the possibility to expand radially when influenced from within, and a piston 9 displaceable inside the sleeve 8. The sleeve 8 is closed at its free end, for example by means of a threaded nipple 10. The sleeve 8 has an inner surface 1 1 which widens slightly conically in the outward direction from the transition portion 1, and the piston 9 has a correspondingly cone-shaped outer surface 12. The conicity of the sleeve 8 and in the piston 9 is such that the piston is self-locking in each displacement position in sleeve. The surfaces 11 and 12 of the sleeve and piston provide a mutual seal, and the piston has such a shape that in the relaxed position it is close to the nipple 10.

För att möjliggöra en inpressning av kolven 9 i hylsan 8 och därigenom en radiell expandering utåt av hylsväggen, så som visas i figur 1, är nippeln 10 utformad som en trycksättningsnippel genom vilken ett hydrauliskt tryckmedium kan pressas in i en tryckkammare 13, som bildas mellan nippeln 10 och ytteränden på kolven 9.To enable a piston 9 to be pressed into the sleeve 8 and thereby a radial outward expansion of the sleeve wall, as shown in Figure 1, is the nipple 10 designed as a pressurizing nipple through which a hydraulic pressure medium can be pressed into a pressure chamber 13, which is formed between the nipple 10 and the outer end of the piston 9.

Eftersom kolven 9 är självlåsande i hylsan 8 har en andra trycknippel 14 anordnats vid den inre änden av hylsan 8, och genom denna andra trycknippel 14 kan ett hydrauliskt tryckmedium pressas in i en returtryck- kammare 1 5, så att kolven 9, efter evakuering av tryckmediet i tryck- kammaren 13 kan pressas tillbaka till sitt i figur 2 visade ursprungsläge, varvid hylsans 8 väggar återförs till sitt icke-expanderade ursprungsläge och därigenom verktyget eller verktygen frigörs och kan tas bort från dorntappen 3.Since the piston 9 is self-locking in the sleeve 8, it has a second pressure nipple 14 is arranged at the inner end of the sleeve 8, and through this other pressure nipple 14, a hydraulic pressure medium can be pressed into a return pressure chamber 15, so that the piston 9, after evacuating the pressure medium in the chamber 13 can be pushed back to its original position shown in figure 2, wherein the walls of the sleeve 8 are returned to their unexpanded original position and thereby releasing the tool or tools and can be removed from the mandrel pin 3.

Nippeln 14 behöver i sig inte vara anordnad så som visas i figuren, utan trycksättningsorgan kan även placeras på andra ställen, t ex i över- gångspartiet 1.The nipple 14 itself does not have to be arranged as shown in the figure, without pressurizing means can also be placed in other places, for example in the aisle 1.

Det går därigenom lätt och snabbt att byta verktyg, och verktygen erhåller en perfekt centrering och perfekt balansering på dorntappen. Det är också möjligt att låta verktygen 'sitta kvar på dorntappen och att vid återkommande bearbetning med samma verktyg ta bort hela dornen ochThis makes it easy and quick to change tools, and the tools obtains a perfect centering and perfect balancing on the mandrel pin. It is also possible to leave the tools' on the mandrel and that at recurring machining with the same tool remove the entire mandrel and

Claims

10 15 20 25 30 35 5 511 097 PATENT REQUIREMENTS

Hydromechanical mandrel preferably intended to be mounted with one end (2) in a rotating machine tool (cone 2), and to releasably support with its other end (3) one or more machining tools of the type hollow tool (4), and wherein this the other end is designed as a mandrel pin (3) with an outer jacket surface, on which one or more tools (4) can be slid on and secured without the use of cross wedges, splines or other mechanical locking means, or press joints arranged on the mandrel surface of the mandrel, and where a perfect centering of the tool or tools is obtained, characterized in that the mandrel pin (3) is designed as a hydromechanical clamping bushing comprising a sleeve (8) with a relatively thin, radially expandable wall and with a slightly conical inner surface (1 1) in the axial direction, and a in this sleeve (8) axially displaceable, floating piston (9) with the same conical shape (12) as the inner surface of the sleeve, and in that at each end of the piston (9) there is a pressure chamber (13, 15) for hydraulic pressure sealing of a pressure chamber to effect a displacement of the piston (9) in the sleeve (8) and thereby a radial expansion of the sleeve (8) and a pressure relief with radial contraction of the sleeve (8), respectively.

Hydromechanical mandrel according to claim 1, characterized in that the conicity of the sleeve (8) is such that the diameter of the sleeve increases towards its outer end.

Hydromechanical mandrel according to claim 1 or 2, characterized in that the sleeve (8) is closed at its outer end by means of a fixed nipple (10) inserted through the sleeve end through which a hydraulic pressure medium can be introduced into the pressure chamber (13) between the nipple ( 10) and the nearby carbon head.

Hydromechanical mandrel according to claim 1, 2 or 3, characterized in that the inner surface (1 1) of the sleeve (8) and the outer surface (12) of the piston (9) are conically widened in the outward direction from a transition portion (1) at the mandrel pin (3) inside.

Hydromechanical mandrel according to Claim 4, characterized in that the surfaces (1 1, 12) of the sleeve and piston have a self-inhibiting conicity.

Hydromechanical mandrel according to one of the preceding claims, characterized in that the mandrel has a pressure medium connection (14) in the inner part of the mandrel, which connection opens into a return pressure chamber (15) in which a hydraulic pressure medium can be pressed in to return the piston (9 ) to its original position, in which the sleeve (8) is unexpanded.

Hydromechanical mandrel according to one of Claims 4 to 6, characterized in that the transition portion (1) has driver holes (6) in which driver pins (7) of the tool can be connected.