Osnovni dio svake viševretene bušilice jest njezina radna jedinica koja se naziva glava za bušenje. Uporaba viševretenih bušilica omogućuje simultano bušenje rupa u redovima, što čini takve bušilice učinkovitijima od jednovretenih bušilica. No njihov je nedostatak nemogućnost bušenja rupa u četvrtastim drvnim elementima. To je osobito velik problem kad je riječ o bušilicama za prolazne provrte, što je razlog da se u području te vrste obrade
provode intenzivna istraživanja. Projekt pridonosi proširenju tehnoloških mogućnosti viševretenih bušilica, a u radu se razrađuju neke mogućnosti njihova opremanja.The basic element of each multiple-spindle driller is its working unit also called drilling head. The use of multi-spindle drill heads enables simultaneous drilling of holes arranged in rows, which makes such drillers much more efficient than one-spindle drillers. However their defect is the lack of possibility to make holes in stud elements. Passage drillers are particularly affected by this problem and this is why research on this machine-tooling was undertaken. The project enables widening technological possibilities of multiple-spindle /gang/ drilling machines. This paper deals with the presentation of some types of tooling

Grzegorz Wieloch

Marcin Osajda

Hrčak - Portal of scientific journals of Croatia

Grzegorz Wieloch, Marcin Osajda1Project of instrumentationof cyclic multiple-spindledriller aimed at improvingits machining efficiency*Projekt opremanja vi{evretene bu{ilice radipove}anja njezina u~inka*Professional paper • Stru~ni radPrispjelo - received: 7. 11. 2005. • Prihva}eno - accepted: 25. 4. 2006.UDK: 630*823.126; 674.055:621.95ABSTRACT • The basic element of each multiple-spindle driller is its working unit also called drilling head. Theuse of multi-spindle drill heads enables simultaneous drilling of holes arranged in rows, which makes such drillersmuch more efficient than one-spindle drillers. However their defect is the lack of possibility to make holes in studelements. Passage drillers are particularly affected by this problem and this is why research on this machine-too-ling was undertaken. The project enables widening technological possibilities of multiple-spindle /gang/ drillingmachines. This paper deals with the presentation of some types of tooling.Key words: multiple-spindle drilling machine, instrumentation, effectivenessSA@ETAK • Osnovni dio svake vi{evretene bu{ilice jest njezina radna jedinica koja se naziva glava za bu{enje.Uporaba vi{evretenih bu{ilica omogu}uje simultano bu{enje rupa u redovima, {to ~ini takve bu{ilice u~inkovitijimaod jednovretenih bu{ilica. No njihov je nedostatak nemogu}nost bu{enja rupa u ~etvrtastim drvnim elementima. Toje osobito velik problem kad je rije~ o bu{ilicama za prolazne provrte, {to je razlog da se u podru~ju te vrste obradeprovode intenzivna istra`ivanja. Projekt pridonosi pro{irenju tehnolo{kih mogu}nosti vi{evretenih bu{ilica, a uradu se razra|uju neke mogu}nosti njihova opremanja.Klju~ne rije~i: vi{evretena bu{ilica, opremanje, u~inak1 INTRODUCTION1. UVODMultiple-spindle drillers can be included into basicwoodworking machines used in furniture industry; howe-ver their machining range is limited to making holes andmost frequently for dowel or screw connections (Kien,2003; Lisican et al, 1996; Siklienka and Sajbanova, 2002).Drilling of holes’ sockets is still one of the basictechnological operations performed in furniture in-dustry. Dowel joints, commonly used in furniture con-structions, and different kinds of fittings, which requireperforming of various sockets and holes, basically canbe divided into:– constructional (e.g. dowel connections, Confirmatscrew connections)– for fitting (e.g. holders, locks, hinges (fig.1))Speaking of drilling, in a considerable number ofcases of standard machining, the so called series dril-DRVNA INDUSTRIJA 56 (3) 115-119 (2005) 115.............. Wieloch, Osajda: Project of instrumentation of cyclic multiple-spindle ...1Authors are assistant professor and assistant at the Agricultural University in Poznan, Poland.1Autori su docent i asistent na Poljoprivrednom sveu~ili{tu u Poznanju, Poljska.* Rad je pripremljen za sastanak Interkatedra 2005 „Woodworking technique”* The paper was prepared for meeting Interkatedra 2005 „Woodworking technique”ling can be encountered. In such cases holes are arran-ged in rows, usually in straight line.Wide application of wood product boards espe-cially in constructions of cabinet furniture resulted in awide use of joint hinges (e.g. eccentric joints). Such jo-ints require many series drillings and compound dril-lings (Fig. 2). All the above mentioned aspects have re-sulted in a dynamic development of multi-spindle dril-ling machines.Multiple-spindle drillers can be divided into twogroups (Lisi~an et al, 1996; Siemiñski, 1991):– passage – used in production lines– cyclic – used for small series; flexible approach tofurniture production.The most important part of each multi-spindle dril-ler is its working unit - the driller head (Fig. 5). The effi-ciency of this type of heads in such machines has beenconsiderably improved and the machining time shorte-ned in comparison to one-spindle drillers (Fig. 6).Increasing application of dowel and metal joints(e.g. Confirmat screws) in skeleton constructions madeimpossible the use of one-spindle drillers with conven-tional equipment. This can be illustrated by drilling in116 DRVNA INDUSTRIJA 56 (3) 115-119 (2005)Wieloch, Osajda: Project of instrumentation of cyclic multiple-spindle ... ..............Figure 1 An example of door hingesSlika 1. Primjer vratnih {arkiFigure 2 Examples of drillings in furniture unitsSlika 2. Primjer bu{enja dijelova namje{tajaFigure 3 Cyclic multiple-spindle drillers (Vitap- Italy)Slika 3. Cikli~ne vi{evretene bu{ilice (Vitap- Italija)Figure 4 Passage multiple-spindle drillers (Biesse- Italy)Slika 4. Vi{evretene bu{ilice za prolazne rupe (Biesse- Italija)Figure 5 Example of head passage of multiple-spindle drillerSlika 5. Glava vi{evretene bu{ilice za prolazne rupeFigure 6 One-spindle drillerSlika 6. Jednovretena bu{ilicanarrow units especially in the fronts (Kien,1996; Kien,2003; Kien, 2000; Osajda and Wieloch, 2005).Sometimes there are situations when holes aredrilled in ++ areas lying at an angle to other surfaces ofthe machined object (e.g. when units are connected bysplayed joints). Although there is a possibility of headadjustment to different angles (e.g. 45°), difficultiesarise in positioning and fixing the machined objects. Itenables a wider use of standard cyclic multi-spindledriller instead of an expensive specialised one (Fig. 7).Further to the above reasons, in a furniture factorywhich has no specialised cyclic multi-spindle driller(e.g. Fig. 7) at its disposal, the holes in units are drilledone by one by a one-spindle driller (Fig. 6) or by a hori-zontal drill-moulder. However, this is a labour consu-ming method with low efficiency, and what is more itoften requires the use of special equipment.Arrangement and number of heads and spindlesin these heads in majority of multi-spindle drillers en-courage their use in atypical machining operationsespecially in drilling holes in scantling units with theuse of additional equipment.Based on the above considerations, a project ofspecial instrumentation was elaborated in the Depar-tment of Woodworking Machinery and Basis of Machi-ne Construction at the Agricultural University in Poz-nañ aimed at improving technological possibilities ofholes drilling in scantling units.The aim of this paper was to design machining in-strumentation (two handlings) that would enable theuse of a cyclic multi-spindle driller with the performan-ce efficiency, which cannot be obtained with the stan-dard equipment. Such performance mainly consists ofsimultaneous drilling of several holes in side surfacesof scantling units like sill or table legs as well as drillingholes with skew axis to the unit surface.2 CONCEPT AND DESIGN OFINSTRUMENTATION2. KONCEPT I RAZVOJ OPREMEBefore developing the design, the followingfore-designs were made (Dobrzañski, 1981; Kien,2003; Osajda and Wieloch, 2005):– Adjustment of the design of DCWGW - 19 mul-ti-spindle driller (Polish product).– Enabling drilling of holes with skew axes (angle ran-ge from 30° to 75°), situated on the surface of squaretimbers usually at the axis distance smaller than mo-dule “32”.– Machining of several units simultaneously.– Adding instrumentation consisting of one or severalcomponents. The application of suggested solutionsprovides no adaptation of the drilling machine.– Adjustment of drilling to work with instrumentationdepends on limited disassembly, or change of loca-tion of its components. Quick return to the basic ver-sion of the machine should be possible any time.– Utilization of the existing fixing system (Osajda andWieloch, 2005).3 PROJECT RESULTS3. REZULTATI PROJEKTA3.1 Holder of cyclic multi-spindle driller3.1. Dr`a~ cikli~ne vi{evretene bu{iliceThe most important element of instrumentationshown in Figure 10 is a movable system of two boardsconsisting of the footing (Dobrzañski, 1981) and upperDRVNA INDUSTRIJA 56 (3) 115-119 (2005) 117.............. Wieloch, Osajda: Project of instrumentation of cyclic multiple-spindle ...Figure 7 Specialised cyclic multiple-spindle machine(Knoevenagel - Germany)Slika 7. Specijalizirana cikli~na vi{evretena bu{ilica(Knoevenagel - Njema~ka)Figure 8 Examples of holes drilled in scantlings - square timberSlika 8. Primjer rupa izbu{enih u ~etvrta~amaFigure 9 Cyclic multi-spindle drilling machine - typeDCWGW-19Slika 9. Cikli~na vi{evretena bu{ilica, tip DCWGW-19board (Kien, 1996). The footing of the holder, made ofMDF board, is used for fastening the holder to the worktable of the drilling machine. The upper board - alsomade of MDF board – is equipped with support blades(Kien, 2003) and blade clamps (Kien, 2000) that can beregulated.After fixing tightly the holder to the machinebody and providing appropriate deflection of the upperboard, depending on machining conditions, machinedunits have to be put in the right place. The instrumenta-tion enables simultaneous drilling of five units. Themachined objects are inserted from the top between thesupport blades and blade clumps. The spring situated inthe clamp body causes pressure on pressure blade,which enables its movement in a pre-set range and itsconstant contact with the machined unit. The heads ofmachined units have to be adequately pushed to the re-sistance blade of the machine as shown in Figure 10.After fixing the units, the drilling operation of all unitsstarts simultaneously. During the drilling cycle, theunits are immobilized by pneumatic clamps of the dril-ling machine with pressure blades.After having performed the sockets, the drillerheads withdraw to the initial position after which ma-chined units are removed and the next units are insertedinto the holder. The following drilling cycles are per-formed in the same way as described above.4 CONCLUSION4. ZAKLJU^AK1. The designed holder of DCWGW- 19 cyclic mul-ti-spindle driller enables drilling of holes at anglesfrom 30° to 75° to surface areas of square timber units.2. Taking into consideration the vertical movement ofthe working unit in the range of 60 mm, there is apossibility - after having used the holder – of dril-ling holes in skew surfaces at optional distances.3. The holder enables drilling of non-square timberunits of the following dimensions: (20-100) x(20-100) x (200-500); the drilling operation of all(5) units starts simultaneously.5 REFERENCES5. LITERATURA1. Dobrzanbski, T. 1981: Uchwyty obróbkowe. Poradnikkonstruktora. WNT, Warszawa.118 DRVNA INDUSTRIJA 56 (3) 115-119 (2005)Wieloch, Osajda: Project of instrumentation of cyclic multiple-spindle ... ..............Figure 10 Prototype instrumentation of cyclic multi-spindle drilling machineSlika 10. Prototip opreme za cikli~ne vi{evretene bu{iliceFigure 11 Simulation of use of instrumentation of cyclic multi-spindle drilling machineSlika 11. Simulacija uporabe opreme cikli~nih vi{evretenih bu{ilica2. Kien, W. 1996: Atlas konstrukcji przyrzasdów i uchwytówobróbkowych w przemyœle drzewnym. Wyd. AR Poz -nanb.3. Kien, W. 2003: Oprzyrzasdowanie obróbkowe. Meble iTechnika nr 3/2003.4. Kien, W. 2000: Przyrzasdy, uchwyty i sprawdziany spec-jalne w przemysble drzewnym. Wyd., AR Poznanb.5. Kien, W. 2003: Wiertarki wielowrzecionowe. Meble iTechnika nr 3/2003.6. Informative materials and folders of firms: Alberti, Bies-se, Homag, Gomad, Weeke, Morbidelli, Vitap, SCM,Nottmeyer, Knoevenagel, Festo.7. Lisican et al. 1996: Teoria a technika spracovania dreva.Mat –Centrum, Zvolen8. Meier, G. 1997: Spanabhebende Maschinen in der Hol-zverarbeitung.9. Osajda, M., Wieloch, G. 2005: Adaptations of multi-ple-spindle drillers resulting in expanding their machi-ning possibilities. 3. International PhD Conference onMechanical Engineering. PhD 2005, Westbochemia Tec-hnical University, Pilzno10. Sieminbski, R. 1991: Obrabiarki do drewna. PWN, War-szawa.11. Siklienka, M., Sajbanova, D. 2002: The influence of cho-sen factors on torque and trust during boring of somekinds of woods. In Proceedings Intern. Science Confe-rence: “Chip and Chipless woodworking processes "02”,231-234.Corresponding address:Assist. Prof. GRZEGORZ WIELOCH, PhD.Agricultural University in PoznanChair of Machining and Basis of Machine Constructionul. Wojska Polskiego 38/4260-627 Poznanb, Polande-mail: obrawielºau.poznan.plDRVNA INDUSTRIJA 56 (3) 115-119 (2005) 119.............. Wieloch, Osajda: Project of instrumentation of cyclic multiple-spindle ...

Project of instrumentation of cyclic multiple-spindle driller aimed at improving its machining efficiency

Abstract

Similar works

Full text

Available Versions

Hrčak - Portal of scientific journals of Croatia

HRČAK - Portal of Croatian Scientific and Professional Journals