CN203765321U - Clamp for cross universal joint fork head - Google Patents

Abstract

The utility model discloses a clamp for a cross universal joint fork head. The clamp comprises a clamping disk, a Z-direction positioning device fixed to the clamping disk, an X-direction positioning and clamping device, a Y-direction positioning and clamping device and a pressing device, wherein the Z-direction positioning device comprises two V-shaped blocks which are symmetrically fixed to the clamping disk, and the X-direction positioning and clamping device comprises two symmetrical X-direction linkage claws and two X-direction linkage claw locks; the Y-direction positioning and clamping device comprises two symmetrical Y-direction linkage claws, two Y-direction linkage claw locks, two mandrels and two self-alignment pressing plates; the pressing device comprises a cover plate and a pressing fastener; the cover plate is connected to the V-shaped blocks, and the pressing fastener is connected to the cover plate; a measurement hole is formed in the cover plate. The clamp reduces the position error of a workpiece to the maximum extent, time for multiple times of clamping is saved, operating difficulty is reduced, the machining quality of the fork head is guaranteed, the assembling quality of a cross universal joint can be guaranteed easily, and meanwhile the machining efficiency of the fork head is improved.

Description

The fixture of candan universal joint jaw

Technical field

The utility model relates to mechanical manufacturing field, particularly the fixture of candan universal joint jaw.

Background technology

Candan universal joint is a kind of machine power driving joint generally using, and rotates, so only have static balance and the good dynamic balance of the good guarantee universal joint of symmetry of each part during because of its work.But the jaw machined of universal joint generally adopts multiple working procedure to machine at present: minimum two procedures, five, six many procedures are even more.Because each processing location, centering and installation site can not be the same, therefore multiple working procedure inevitably can cause location or correct error, operation is more, and accumulated error is also larger.At present, the batch that general jaw specification is little is large, adopts fixture location on streamline more; The batch that jaw specification is large is little, the line centerings that adopt more, or adopt fixture location.In universal joint assembling, on jaw, directly coordinate, be connected with correlated parts or body structure surface in close relations (referred to herein as functional surfaces, see D in Fig. 1, E, F, G), its size and positional precision directly affect the performance of universal joint, and functional surfaces comprises flange, dead eye, flange hole and end face of flange teeth groove or keyway etc.The mutual position degree of each functional surfaces requires high, as dead eye and flange seam symmetry, the depth of parallelism with end face of flange, the axiality in two bearings hole, the symmetry of dead eye inner shield ring groove and flange seam and the beating degree to dead eye, 8 position of related features General Requirements such as the position degree of symmetry, flange hole and flange seam and the dead eye of the axiality at end face of flange teeth groove center and flange seam center or side keyway and flange seam are all at 7 grades or 8 grades, and some occasion requires can be higher.And if add man-hour workpiece be jaw through multiple clamping, these precision are difficult to ensure simultaneously.At machine industry, also without any a kind of processing method, can realize and in same clamped one time, machine functional surfaces all on jaw at present.

Summary of the invention

Problem to be solved in the utility model is to provide the fixture that candan universal joint jaw adds man-hour, this processing method is according to the design feature of jaw, fixture carries out symmetry location with the non-machined surface of inner chamber of jaw, fixture and machine tool are supported mutually, dodge mutually, make workpiece in clamped one time, realize the processing of each functional surfaces of jaw, thereby position error and the correct error of multistage manufacturing processes inter process are eliminated, between the each machined structure of workpiece that location is caused, site error reduces to zero, thereby overcome the large shortcoming of site error between the functional surfaces that in prior art, the many orders of jaw machined are brought.This novel clamp has ensured the crudy of jaw, is conducive to ensure candan universal joint assembly quality, has also improved the working (machining) efficiency of jaw simultaneously.

The fixture of the utility model candan universal joint jaw, it comprises chuck, be fixed on Z-direction positioner on chuck, X to the location of Y-direction and clamping device, hold down gag; Z-direction positioner comprises two vee-blocks, and two vee-blocks are fixed on chuck symmetrically; X comprises that to location and clamping device X links two pawls, X to interlock two pawl locks to symmetry, X is arranged between two vee-blocks to symmetry two pawls that link, and with chuck hub symmetry, X penetrates from the outside of a vee-block to interlock two pawl locks, passes after interlock two pawls through X from the outside of another vee-block; Comprise Y-direction location and clamping device symmetrical two pawls that link of Y-direction, Y-direction link two pawl locks, two axles, two self-alignment pressing plates, the symmetrical interlock of Y-direction two pawls are fixed on chuck slide symmetrically, each interlock pawl all connects self-alignment pressing plate by the axle on it, on the opposite face of two self-alignment pressing plates, be provided with little support, the Y-direction two pawls locks that link are arranged on chuck; Hold down gag comprises cover plate, compresses securing member; Cover plate is connected on vee-block, compresses securing member and connects on the cover board; On cover plate, have measured hole.

Fixture of the present utility model has been caught formation and the design feature of jaw, with the symmetrical location of the non-machined surface of inner chamber, is ensureing under the prerequisite of joint angle and intensity positioning and clamping mechanism and device that employing and structure and requirement adapt; Fixture of the present utility model is applicable to use on multi-axis NC Machine Tools, and in process, fixture and machine tool are supported mutually, dodged mutually, realizes the cutting movement of the each functional surfaces of processing; Thereby clamped one time can complete the processing of all functions faces such as comprising flange, dead eye, flange hole and end face of flange teeth groove or keyway, position error and the correct error of multistage manufacturing processes inter process are eliminated, between the each machined structure of workpiece that makes to be caused by location, site error reduces to zero, the site error part that only remaining lathe worker process system causes, reach minimum, this minimum is by the precision of process system and rigidity decision and inevitable.

This novel clamp has reduced the site error of workpiece to greatest extent, has saved the time of multiple clamping, has reduced operation easier, has ensured the crudy of jaw, is conducive to ensure candan universal joint assembly quality, has also improved the working (machining) efficiency of jaw simultaneously.

Brief description of the drawings

Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation:

Fig. 1 is functional surfaces and classification and the positioning principle figure of jaw;

Fig. 2 is the structural representation of this novel clamp.

Detailed description of the invention

Existing candan universal joint is mainly made up of parts such as two jaws, cross axle, bearing and back-up rings, and same specification joint must ensure centering in limited gap.The dead eye of jaw and fork outside and flange excircle, flange excircle and fork inner side and dead eye guide ring groove all need symmetry.Jaw is generally cast by essence or finish forge forms, except working speed is high, required precision high, between its cylindrical, fork body inner side and two fork bodies recess without machined, symmetrical and not machined, thereby must implement taking its non-machined surface as benchmark to locate.

Taking the flanged yoke with end-tooth as example, as can be seen from Figure 1, the functional surfaces of jaw comprises flange surface, dead eye and circlip groove, flange hole and screw, end face of flange teeth groove or side keyway etc., specific as follows 1. main surfaces of revolution D: seam heavy stand face D-1, seam face of cylinder D-2, end face of flange D-3, flange excircle cylinder D-4, flange anchor ring D-5 and neck external cylindrical surface D-6; 2. horizontal surfaces of revolution E: dead eye E-1 and circlip groove E-2; 3. the vertical surfaces of revolution and helicoid F: flange hole F-1 and screw part F-2; 4. end face teeth groove or keyway G.

As shown in Figure 2, the fixture of this novel candan universal joint jaw, it comprises chuck 6, be fixed on Z-direction positioner on chuck 6, X to the location of Y-direction and clamping device, hold down gag; Z-direction positioner comprises that 3, two vee-blocks 3 of two vee-blocks are fixed on chuck 6 symmetrically; X comprises that to location and clamping device X links two pawls 9, X to interlock two pawl locks 8 to symmetry, X is arranged between two vee-blocks 3 to symmetry two pawls 9 that link, and with chuck 6 Central Symmetries, X penetrates from the outside of a vee-block to interlock two pawl locks 8, passes after interlock two pawls 9 through X from the outside of another vee-block; Comprise Y-direction location and the clamping device symmetrical interlock of Y-direction two pawls 4, Y-direction link that two pawls lock 7, two axles 1, two self-alignment pressing plates 2, the symmetrical interlock of Y-direction two pawls 4 are fixed on chuck slide 5 symmetrically, each interlock pawl 4 all connects self-alignment pressing plate 2 by the axle 1 on it, on the opposite face of two self-alignment pressing plates 2, be provided with ramuscule support 12, the Y-direction two pawls locks 7 that link are arranged on chuck 6; Hold down gag comprises cover plate 10, compresses securing member 13; Cover plate 10 is connected on vee-block 3, compresses securing member 13 and is connected on cover plate 10; On cover plate 10, have measured hole 11.

The positioning principle of this novel clamp is as shown in Figure 1: two vee-blocks position by tiltedly descend four fork side acnode a of direction to contact with fork body side surface, limit Z-direction, Y-direction, , 4 frees degree, X links two pawls by contacting location with two fork home record point b of fork inner side to symmetry, and X is to the free degree in restriction, and the symmetrical interlock of Y-direction two pawls are by contacting location, restriction with four fork side point c of fork body root side the free degree.Fastening is: X has certain clamping function to symmetry two pawls that link in location, and the related self-alignment pressing plate of Y-direction symmetrical interlock two pawl has certain clamping function in location, and main clamping force is that the nut on workpiece top compresses, i.e. the clamping of Z-direction.In a word, it is by 4 fork side cambered surface point a points on jaw, 2 fork home record point b points, 4 fork side plane point c points, jaw to be positioned that the location of this novel clamp clamps, wherein four frees degree of 4 a point restrictions, 2 b point symmetries clamp 1 free degree of restriction, and 4 c point symmetry location clamp 1 free degree of restriction; And control symmetry: 4 c point locations clamp and adopt the symmetrical Liang Zhao mechanism that links, and related self-alignment pressing plate, the mistake orientation problem that solution causes because of fork chaeta base error, and realize the symmetrical clamping of locating.This novel clamp can complete whole machined contents of its functional surfaces in clamped one time.

The fixture of this novel candan universal joint jaw should change because of the difference of the use occasion of workpiece and performance requirement, specification difference, lathe function difference in the specific implementation: can be that pure mechanical mechanism is realized location clamping; also can adopt hydraulic pressure or pneumatic pinch; or the structure that machinery combines with hydropneumatic; as long as adopt 4 a points, 2 b points, 4 the c point locations shown in Fig. 1; wherein 2 b points and 4 c points limit respectively 1 free degree; within just belonging to protection scope of the present invention, and be not limited to the pure frame for movement shown in Fig. 2.As machinery combines with pneumatic clamping with hydraulic pressure or machinery.

This is novel is with the most complicated flange jaw of structure in jaw as an example, has narrated at clamped one time and just can complete the fixture that repertoire face is processed.The processing of the simple weld yoke of process structure and side keyway, the anodontia flanged yoke without key has just been readily solved so.

This novel fixture is with the symmetrical location of the non-machined surface of inner chamber, whole machined contents of the functional surfaces that common jaw functional surfaces multiple working procedure just can be completed, concentrate in clamped one time and complete, thereby the location of multistage manufacturing processes inter process, the method for correct error are eliminated, make the position error between workpiece machined structure be reduced to machine tool accuracy institute energy, reach minimum, this minimum is to be determined also inevitably by lathe worker process system.This type fixture Zhong Ge mechanism layout of interlocking, associated and do not interfere, and do not affect the cutting tool of the each machined structure of workpiece, thus realize rotation main motion and the dividing movement of main motion, feed motion, workpiece self.

Claims (2)

1. the fixture of candan universal joint jaw, is characterized in that: it comprises chuck (6), be fixed on Z-direction positioner on chuck (6), X to the location of Y-direction and clamping device, hold down gag; Z-direction positioner comprises two vee-blocks (3), and two vee-blocks (3) are fixed on chuck (6) symmetrically; X comprises that to location and clamping device X links two pawls (9), X to interlock two pawl locks (8) to symmetry, X is arranged between two vee-blocks (3) to symmetry two pawls (9) that link, and with chuck (6) Central Symmetry, X penetrates from the outside of a vee-block to interlock two pawl locks (8), passes after interlock two pawls (9) through X from the outside of another vee-block; Comprise Y-direction location and clamping device Y-direction symmetrical interlock two pawls (4), Y-direction two pawls that link are locked (7), two axles (1), two self-alignment pressing plates (2), Y-direction symmetrical interlock two pawls (4) are fixed on chuck slide (5) symmetrically, each interlock pawl (4) all connects self-alignment pressing plate (2) by the axle on it (1), on the opposite face of two self-alignment pressing plates (2), be provided with little support (12), the Y-direction two pawls locks (7) that link are arranged on chuck (6); Hold down gag comprises cover plate (10), compresses securing member (13); It is upper that cover plate (10) is connected to vee-block (3), compresses securing member (13) and be connected on cover plate (10); On cover plate (10), have measured hole (11).

2. fixture according to claim 1, it is characterized in that: fixture positions jaw by 4 fork side cambered surface point a points on jaw, 2 fork home record point b points, 4 fork side plane point c points, wherein four frees degree of 4 a point restrictions, 2 b point symmetries clamp 1 free degree of restriction; 4 c point symmetry location clamp 1 free degree of restriction, make to complete in clamped one time whole machined contents of jaw all functions face; The structure that this fixture can adopt machinery, machinery to combine with pneumatic clamping with hydraulic pressure or machinery.