Background technology
At present; in machining, regular meeting runs into the workpiece that is made of interior ball-and-socket face, jatharapanvartanasana circular section, the die cavity position on for example various ball inner bag moulds; die cavity position of Tire ﹠ Tube mould or the like in the various tires all is the workpiece that has the jatharapanvartanasana circular section.General this series products or mould mostly are the workpiece of single-piece or small lot batch manufacture.Be characterized in: radial dimension is big, and cross dimensions is very little, and requirement on machining accuracy is higher.Adopt common lathe, milling machine to process, or with form tool, catch up with the skill in using a kitchen knife in cookery etc. to process certain difficulty all can be arranged, and the labour intensity of processing is big, dimensional accuracy of products, surface smoothness also are difficult for guaranteeing.
Die cavity with the motor casing curing forming mold is an example below, and the processing to the jatharapanvartanasana circular-section workpiece is described.The structural representation of this tyre sulfuration mould as shown in Figure 1, its primary structure form is: workpiece is to be formed around axis rotation by the section with a certain given shape; And section is to be made of the curved surface that comprises circular arc in the part.The curved surface of circular arc and the curved surface of 2 external arc were formed in this its section of motor casing curing forming mold was mutually related by 7, and the size of arc radius differs also bigger: big inner arc radius is R88mm, and little inner arc radius only is R3mm.From structure as seen, processing jatharapanvartanasana circular-section workpiece, mainly form one by the motion of two parts: whole work-piece (overlaps) rotation with a certain gyroaxis on the lathe around the axis, this motion can realize on common apparatus, as rotatablely moving of main shaft on the common horizontal or vertical lathe etc.; Its two: the cutter of processing produces operation (cutting) track as the truncation surface sideline.Way commonly used before numerical control device is not arranged is to utilize skilled turner to rebuild on lathe, to form truncation surface sideline profile; With see the numerical control car, mill, the appearance of machining center lathe, existing quite a few processing enterprise utilizes numerical control device processing to replace manually-operated.During manually-operated, because of being subjected to direct labor's artificial factor such as technical merit, can cause curve irregular, produce circular arc on the non-complete meaning, problem such as crudy is not high, efficient is low, the joint of truncation surface curve when also being difficult to simultaneously to guarantee the upper and lower mould matched moulds of mould; And on Digit Control Machine Tool, process, the minimum Moving Unit of cutter is a pulse equivalency, so the movement locus of cutter is a broken line, causes the cutter can not be strictly along the curvilinear motion of being processed, can only approach the curve of being processed with dog-leg path, thereby equally also not be smooth curve; Simultaneously they are in the state static with respect to knife rest all the time adding the man-hour cutter, and certainly will require point of a knife is annular.Above-mentioned restriction not only can influence shape, the precision of workpiece, and when also causing simultaneously processing the type part, integrated cost is too high.
Therefore, it is very necessary needing a kind of new special-purpose swivelling tool-holder that can realize the processing of the above-mentioned type circular arc of invention.
The utility model content
The utility model provides a kind of special-purpose swivelling tool-holder that can realize circular arc processing at the deficiency that above-mentioned prior art exists.
The utility model adopts following technological means in order to realize above-mentioned technical purpose: a kind of swivelling tool-holder, be installed on the lathe, and described swivelling tool-holder comprises: have the tool holder body of connecting hole, it is installed on the lathe by described connecting hole; Rest pad is fixedly installed in described tool holder body; Worm screw is installed on described tool holder body by described rest pad; Worm gear, be installed on described tool holder body and with the interlock of described worm screw; Master gear is fixedlyed connected and coaxial with it rotation with described worm gear; From gear, be installed on described tool holder body and with the interlock of described master gear; Tool rest is installed on described tool holder body, fixedlys connected and coaxial with it rotation from gear with described.
Also be provided with the tightening axle between described worm gear and the tool holder body, tightening axle and bolt are fixedly installed in described tool holder body with described worm gear and master gear.
Also be provided with between described worm gear and the tightening axle and be used to make described worm gear to rotate level and smooth copper bearing shell with respect to the tightening axle.
Also be provided with between described worm gear and the master gear and be used to make described worm gear and at least two synchronous fluting flush end holding screws of master gear.
Also be provided with between described tool rest and the tool holder body and be used to make described tool rest to rotate level and smooth copper bearing shell with respect to tool holder body.
Describedly be connected described flat key from gear and tool rest from being provided with to be used for fixing between gear and the tool rest.
Described tool rest is set to discoid, is installed on the width of described tool holder body, and the diameter dimension proportion of the width of described tool holder body and discoid tool rest is between 0.5-1.5.
Described tool rest is provided with the cutter groove in its diametric(al); Described tool rest is provided with first tight fixed bolt that is used to regulate the tool position on itself and the same plane of described cutter groove and perpendicular to described cutter groove direction; Described tool rest is provided with second tight fixed bolt that is used to regulate the tool position at it perpendicular to described tool rest in-plane.
Described cutter groove depth is provided with the depth adjustment tight fixed bolt that be used to regulate the cutter degree of depth of a diameter less than described cutter groove diameter less than described tool rest diameter along described cutter groove depth direction.
Described rest pad is provided with at least two, is installed on the dual-side of described tool holder body width respectively; Described rest pad also is provided with the oblong installing hole that is used to regulate degree of fiting between the described worm and wheel.
The swivelling tool-holder that the utility model provides is particularly suitable for processing the jatharapanvartanasana circular-section workpiece, and its accurate to dimension, fineness level improve greatly; The more important thing is that it has really realized in process, point of a knife point the rotatablely moving on the circular trace of strictness of processing usefulness reduced the difficulty of processing of the type workpiece simultaneously, significantly improved production efficiency and product quality.
The specific embodiment
Introduce the utility model in detail below in conjunction with accompanying drawing.
An embodiment according to a kind of swivelling tool-holder of the utility model, as Fig. 2-shown in Figure 4, this circular arc is processed special-purpose swivelling tool-holder and is comprised: from hex nut 1, thin packing ring 2, flat key 3, from gear 4, from bearing shell 5, tool rest 6, cutter groove 60, lathe tool 61, first tight fixed bolt 7, depth adjustment tight fixed bolt 8, master gear 9, fluting flush end tight fixed bolt 10, tightening axle 11, main bearing shell 12, worm gear 13, thick washer 14, mother nut 15, tool holder body 16, tightness is regulated bolt 17, rest pad 18, worm screw 19, second tight fixed bolt 20, handle 21, installing hole 22, set bolt 23.
, connecting with tool rest 6, be fixedly connected on the tool holder body 16 from hex nut 1, thin packing ring 2 from employing flat key 3 between gear 4 and the tool rest 6 from gear 4; Level and smooth for guaranteeing that tool rest 6 rotates, between tool rest 6 and tool holder body 16, be equipped with made of copper from bearing shell 5; Tool rest 6 is set to discoid, for reaching steady processing, the vibration that produces when avoiding cutting causes damage to lathe tool 61, in the design of tool holder body 16, make its width and the diameter dimension of tool rest 6 close as far as possible, with the most of cutting force of better support, preferable proportion is between 0.5 to 1.5, and what adopt in the present embodiment is 1 to 1.
Tool rest 6 is provided with cutter groove 60 in its diametric(al); Described tool rest 6 is provided with first tight fixed bolt 7 that is used to regulate lathe tool 61 positions on itself and described cutter groove 60 same planes and perpendicular to the direction of described cutter groove 60; Described tool rest 6 is provided with second tight fixed bolt 20 that is used to regulate lathe tool 61 horizontal levels at it perpendicular to described tool rest 6 in-planes; Described cutter groove 60 degree of depth are provided with the depth adjustment tight fixed bolt 8 that be used to regulate lathe tool 61 degree of depth of a diameter less than described cutter groove 60 diameters less than the diameter of described tool rest 6 along described cutter groove 60 depth directions.
Mother nut 15 is fixedly connected on master gear 9, worm gear 13 on the tool holder body 16 jointly with tightening axle 11; For guaranteeing the synchronous of master gear 9, worm gear 13, on their mating surface, adopt 2 fluting flush end holding screws 10 to fix; Make worm gear 13 for the level and smooth rotation of reaching of tightening axle 11 with main bearing shell 12 made of copper equally.
As shown in Figure 3,21 of worm screws 19, handle are by being fixed in two rest pads 18 on the tool holder body 16 and positioning and connecting.Described rest pad 18 is provided with two, is installed on the dual-side of described tool holder body 16 widths respectively; As shown in Figure 4, described rest pad 18 also is provided with the oblong installing hole 22 that is used to regulate degree of fiting between described worm screw 19 and the worm gear 13, during installation, set bolt 23 is tightened earlier slightly, according to the situation that engages between worm screw 19 and the worm gear 13, regulate tightness and regulate the position of bolt 17 in oblong installing hole 22, tighten respectively more at last and regulate tightness adjusting bolt 17, set bolt 23.
Its basic functional principle is: turning handle 21 makes worm screw 19 rotations, interact by worm screw 19, worm gear 13, driving master gear 9 rotates, master gear 9 drives from gear 4 again, pass through the effect of flat key 3 then, make tool rest 6 rotations from gear 4, thereby drive the circular motion that lathe tool 61 is done around the tool rest axle.
This swivelling tool-holder is applicable to processes the workpiece of type as shown in Figure 1 on engine lathe.Before the processing, earlier the swivelling tool-holder clamping is fixed on the knife rest of lathe; If selected swivelling tool-holder overall structure is bigger, be not easy to direct installation, then can adopt between lathe saddle and swivelling tool-holder, to add the mode that a transition supporting stretches out plate and install.
Simultaneously, knife rest stretches out lathe saddle position far away because of being in, general this swivelling tool-holder that just when semifinishing or fine finishining, uses, the cutter hub of the lathe tool 61 that its uses is general to be adopted cylindrically, and diameter cooperates with cutter groove 60 on the tool rest 6 as far as possible, concentric when guaranteeing rotation.The mounting means of lathe tool 61 utilizes first tight fixed bolt 7, depth adjustment tight fixed bolt 8, second tight fixed bolt 20 to fix and adjusting as shown in Figure 2.
Arc surface with R30mm on the processing workpiece as shown in Figure 5 is the use that example illustrates this swivelling tool-holder below: at first the entrucking cutter 61; Only need will be selected cutter threading tool rest 6, and suitably tighten first tight fixed bolt 7, depth adjustment tight fixed bolt 8, second tight fixed bolt 20 and get final product.Next carries out tool setting; Its principle is: with processing stand C (or other is easy to seek a little) is reference point, utilizes the coordinate values difference (Δ x, Δ y) of the centre point 0 of C point and R30 to carry out the centralized positioning of circular arc swivelling tool-holder.1., follow rest and rotary knife base 6 concrete grammar is:, make point of a knife and die joint tangent, simultaneously point of a knife sensing-x coordinate direction.Guarantee that cross slide is constant on the machine slide case this moment; 2., vertical planker is constant on the mobile machine slide case, and point of a knife is overlapped with the C point; 3., the vertical planker of mobile slip crate, displacement is Δ y, and the vertical planker of locking; 4., cross slide on the mobile slip crate, displacement is Δ x, and the locking cross slide.Then finished the fix a cutting tool location in the center of circle of R30 on the centre of gyration and the workpiece of swivelling tool-holder this moment.The 3rd, the adjusting of cutter; The installation that the circular arc knife rest is fixed a cutting tool is adjusted in requirement according to processing dimension.Rotary knife base makes cutter avoid machined surface, and unclamps first tight fixed bolt 7, depth adjustment tight fixed bolt 8, second tight fixed bolt 20.1., allow depth adjustment tight fixed bolt 8 support to the cutter tail end regulating the cutter step is:, and suitably fix with first tight fixed bolt 7, second tight fixed bolt 20; 2., measure dimension D shown in Fig. 5 and L, and calculate the size (30mm deducts and adds spare time) whether L-D/2 equals desire processing; 3., if equate, then clamping bolt 7,20, and then gently twist bolt 8 and push against the cutter tail end; 4., if unequal, turn then that bolt 8 ejects lathe tool 61 or release bolt 8 is pressed into lathe tool 61, equal the size of desire processing until L-D/2 after, by the fixing lathe tool 61 of aforementioned mode 3., can finish the installation of lathe tool 61.The 4th, the realization of processing; Rotary knife base 6 certain angles so that lathe tool 61 leaves machined surface, cause when avoiding the lathe starting and hit cutter.Start lathe spindle, according to the requirement of cutting data, rotary handle 21, thus make lathe tool 61 produce circumferencial direction motion, can produce the cutting feed motion, thereby realize circular arc processing.
The swivelling tool-holder that this is exclusively used in circular arc processing is particularly suitable for processing the jatharapanvartanasana circular-section workpiece, and its accurate to dimension can reach IT6, and fineness reaches 1.2 μ m.The more important thing is that it has really realized in process, point of a knife point the rotatablely moving on the circular trace of strictness of processing usefulness.Overcome in traditional machine tool or processing during circular arc on Digit Control Machine Tool, 1., can not guarantee inconsistent (error too) that the change because of cutter processing part (the point of a knife point in the working angles) causes finished size by mobile machine tool chief axis, make and wholely cutter is done moving interpolation derives:; 2., interpolation adds the non-round characteristic of cutting tool path in man-hour.This knife rest has reduced the difficulty of processing of the type workpiece well, has significantly improved production efficiency and product quality.
Above disclosed only is preferred embodiment of the present utility model, can not limit the interest field of the utility model certainly with this, and therefore the equivalent variations of being done according to the utility model claim still belongs to the scope that the utility model is contained.