The design of machine of slot grinding of numerical control twist drill
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source:AVELLINO CNC Machining
Small diameter twist drill (the helix chamfer of Ø1 ～ 3mm) can be in appropriative grinder -- the treatment on slot grinding machine, machine of slot grinding of the makings on worker handiwork, clamp, operation, on high-speed steel semifinished product grinding gives slot of two symmetrical helix. Its biggest drawback is production preparation is trival, time is longer, norms of twist drill of small diameter of Ø1 ～ 3mm is very much, lead of length of chamfer of diameter, helix, corkscrewed yarn, helix angle is differ. When broach norms is changed, the component such as guide screw of drive of slot grinding machine all wants corresponding change. Labor condition is poor, the grinding fluid of the tremendous noise of the generation when the drab movement of fast rhythm, grinding, pulverization right the health of jockey person is adverse. For this, some factory entrusts us to undertake to machine of this slot grinding numerical control is transformed, implementation is flexible treatment, improve productivity and product quality, improve labor condition. National level did not raise very tall requirement to helix chamfer, because this decision uses open loop control. Is the behavioral program of machine of this slot grinding: ? Brother's son of of mansion of of Dang of Jian of anxiety of ヒ of of Dian of firewood of narrow rare takes aluminous? of of mansion of of Dang of Jian of anxiety of チ a flat stone on iron rammer with ropes attached at the sides to all enter electric machinery control to finish by the pace. The machine of structural slot grinding of slot grinding machine wears two parts to comprise by workbench hopper and emery wheel. Workbench hopper structure pursues the action of hopper of workbench of sketch map of structure of 1 workbench hopper is the semifinished product that hold clip and implementation automatic fluctuation makings, make its form corkscrewed yarn campaign. Automatic fluctuation makings is the difficulty of the design, machining center consulted to trade knife unit automatically when particular structure is designed. If the graph is shown 1 times,the structure designs signal, main shaft is put go up in workbench, workbench installation is on the rectangular slideway that stick model. Enter electric machinery by the pace 1 through guide screw of ball of join of flexibility diaphragm shaft coupling deputy, drive workbench moves point-blank. The pace enters electric machinery 2 through belt of synchronous tooth form drive main shaft turns. The pace enters electric machinery 1 enter electric machinery with the pace 2 harmonious motion, can form the corkscrewed yarn of aleatoric lead. The pace enters electric machinery 4 with gear rack (thimble) the orgnaization is united in wedlock, can get used to different broach length. The particular procedure that hold clip is as follows: The pace enters electric machinery 1 work moment of force is very large, drive main shaft to back down be in to fixed link stopper, continue again backward, already will be in the dish form bedspring that reduces position to continue to compress come to be out of shape appropriately, bring about pinchcock head to open. When processing the 1st work, the semifinished product in hopper weighs strength effect to fall in oneself, in falling at semifinished product conduit to guide groove. The pace enters electric machinery 4 drive semifinished product to come through thimble of gear rack drive treatment position, next not return figure shows thimble position 1 times, be in however the graph shows semifinished product position 1 times. Ever since hold clip, the workpiece after thimble will be machined first is rolled out, next return figure shows thimble position 1 times, promote next semifinished product again. Length of pinchcock head clamp is 10mm. Broach diameter is Ø1 ～ 3mm, expect to assure fluctuation the action is credible, hopper guiding is designed partly adjustable. Main shaft reach, break away from with fixed link stopper, the bounce of dish form bedspring can make semifinished product of pinchcock head clamp, movement of makings, clamp is finished on. Graph the action that 2 emery wheel wear sketch map emery wheel to wear structural emery wheel to wear a structure basically is installation emery wheel, realize the grinding of chamfer of pair of twist drill helix, by guide screw of bracket of asynchronous electric machinery, platform, emery wheel, ball deputy wait for composition, its sketch map sees a picture 2. When the job, emery wheel takes drive through V by asynchronous electric machinery, power makes an appointment with 1kW, the V of self-prossessed Zhang Jin that relies on asynchronous electric machinery is taken annulus. National level stipulates the helix bottom land of twist drill has certain taper in axial, the requirement is cut in the emery wheel in grinding should have change greatly, this enters electric machinery by the pace 3 through guide screw of ball of join of flexibility diaphragm shaft coupling deputy, make jiggle falls on emery wheel (set counterbalance, did not draw) implementation emery wheel cuts profound change. Stick on the perpendicular slideway on emery wheel bracket have plastic. If graph 2a place is shown, emery wheel face and semifinished product axes have one included angle, it is the helix angle B after broach is machined namely. The helix angle of different specifications twist drill is not identical, accordingly, when the design, wear above of emery wheel bracket whole to put park as emery wheel the graph shows platform 2 times to go up, make the included angle B of face of emery wheel grinding and semifinished product axes can adjust by hand. When be being made, workbench hopper structure and emery wheel wear a structure is each other are independent, need to adjust mutual position relation carefully when assemble so. The treatment process main shaft of slot grinding machine is entered to grinding position, the root ministry of helix chamfer is in bracket center (1) seeing a picture, as neat as arenaceous wheel pair. When grinding, should the root ministry from helix chamfer to grinding of twist drill coping, make long and thin semifinished product bears tensile. Emery wheel falls, contact semifinished product, begin grinding. The pace enters electric machinery 1, 2, 3 harmonious movements, the pace enters electric machinery 1, 2 make semifinished product makes corkscrewed yarn motion backward, the pace enters electric machinery 3 control emery wheel is down jiggle. Final, the grinding of chamfer of a helix of twist drill ends. Emery wheel is raised, main shaft advances again to grinding position, enter electric machinery by the pace again 2 control, rotational 180 ° , so that grinding another helix chamfer. Repeat a process 2. Emery wheel is raised, semifinished product is narrated to install clip process before repeating. The process that hold clip and treatment process undertake alternately by the program, successive treatment, the worker need not intervene. Machine of this slot grinding is special machine tool, the movement is simple. Use fixed position to control unit to be control system (namely PLC+ controller) , control pace takes electric machinery action. Slot grinding machine controls many paces to enrage equipment into electric machinery and other report Electromechanical by a PLC. Its stress a good point is process designing simple, reliable, get used to relatively harsh workshop work environment. When broach standards varies, the user still requires a basis national level, adjust the guiding of hopper part and emery wheel - included angle of semifinished product axes (helix angle B) , if complete automation, construction of slot grinding chance will be very complex. Divide this beyond, everything all works by the machine program that inputs beforehand. This slot grinding machine designs whole sealing structure, oily mist is smoked, noise also is restricted, work requirement is improved greatly. A worker can attend machine of a few slot grinding at the same time, want the material on feed hopper only can. Its treatment efficiency and treatment quality all have bigger rise. CNC Milling