SU668787A1 - Jaw chuck - Google Patents

Description

one

The invention relates to machine tools and can be used in the processing of turning and revolving machine tools.

Cam clamping chucks are known, in the cases of which clamping jaws with a radial-displacement drive and bar feeder 1 are placed.

A disadvantage of the known cartridges is the limited range of diameters of the fixed bars.

The proposed cartridge provides reliable clamping and feeding in a wide range of diameters of the fixed rods.

For this purpose, the bar feeder is made in the form of a spring-loaded one supporting roller and two feed screws with cross-cutting placed in the body of the cartridge on the axles, and the rotational drive of the screws is made in the form of a braked solar wheel mounted on the body of the cartridge and kinematically associated with clamping cams and worms so that the rotation of the screws in opposite directions is possible only when moving the clamping cams “On the clamp.

In addition, in order to ensure the possibility of refueling the new rod, the axis of the feed screws and roller is equipped with guide cones, and the roller and screws are made with intake parts. FIG. 1 shows the described cartridge, the cut but the bar feeder; in fig. 2 shows a cartridge with ball bearings supporting the rims with internal gears, cross section; FIG. 3 - cartridge with maximally moved feeder worms, cross section; in fig. 4-5 - sections .A-A and BB in Fig. 3; in fig. 6 - 7 - feeding screws, right and left, with tension springs (sections В - В and Г-Г in Fig. 3); in fig. 8 - supporting smooth roller (section dd in Fig. 3); in fig. 9 - brake of crowns of the mechanism for clamping and unclamping cams.

The cartridge has a housing 1, three cams 2 located in radial grooves made on the ends of the housing 1, a disk with an end helix 3 on which the crown 4 is attached. The end helix 3 can rotate freely on the body 1 and its coils engage with the rails on cam 2.x. A collar 5, 6 and 7 are mounted on the body I near the end helix on the keys. On the ring 5 there are bores for ball bearings 8, 9 and 10, bearing respectively gear shafts 11-14.

On the ring 6 (Fig. 2) there are four bore holes for the fingers 15. On which two ball bearings 16 sit, which are supports for the rims 17 and 18 with internal teeth.

On the ring 7 (Fig. 5) there are bore holes for ball bearings 19, the bearing is, respectively, the second ends of the shafts with 11, 12, 13 shaft sizes (Fig. 4) and 14 (Fig. 1). Gear shaft 20 is mounted on the gear-shaft II (Fig. 5).

The feeding mechanism (Fig. 1), which is inserted into the inside of the chuck on the key, consists of two rings 21 and 22, which are tightened by strings. 23 (FIG. 2). Shaft gear 24 is located between the rings, carrying gear 25 and 26 on the key, two swinging earrings 27 and 28 and spacer sleeve 29. Gear 26 engages gear 30, which rotates on an axis that is integral with the guide cone . 31, and fastened with a nut 32, which clamped the oscillating shackle 28. The earring 27 swings on the spacer sleeve 29, and in it the gear 30 rotates with its collar.

On the shank of the pinhead 30, a feed screw to 33 is mounted on the key, which is intended for feeding the bar material.

Two feed screws 33 and 34 (Figs. 3 and 8) and the supporting smooth roller 35 are reduced to the center by nine springs 36. (Fig. 3 shows the feed screws and the support roller on the minimum bar diameter).

The rotation from gear shaft 24 to a similar gear shaft 37 to the second left screw 34 is transmitted through a crown 38 with internal teeth, a parasitic gear 39, which sits on the spike of the support ring 40 (Fig. 6). The parasitic bristle 39 provides rotation of the second feed screw 34 in the opposite direction with respect to the screw 33. To support the feed mechanism in the cartridge and transfer the bar impact on the guide cones 31 to the cams, when it is loaded into the machine spindle, there is a support ring 40 with a tenon. m for spurious gear 39.

The springs 36 (FIG. 7) are fastened at one end by the holes in the ribs of the rings 21, 22; the other ends of the two springs are hooked on the stub 41, and the end of the third spring is drilled in the head of the bolt 42 wrapped in the guide cone 31.

The feed screw to 33 (Fig. 1) receives rotation from gear 30, which engages with gear block 26, 25 and further with loosely fitting parasitic gear 43, gear 44 having cams

clutches 45 entering the cams, sitting on the gear shaft key 14.

Shaft gear 14 (Fig. 1) engages with 4 internal teeth that are attached to the flat spiral 3. Thus, the feed screw to 33 receives rotation from the slowly rotating flat spiral 3. To limit the movement of the cams when they are the discrepancy serves as a safety ring 46 (Fig. 2), fastened with screws 47 to the body 1 of the cartridge.

The rims 17 and 18 (fig. 2) have deep groove tracks which they roll along four ball bearings 16. The deep grooves keep the rims from axial displacement. Spring 48 (Fig. 1) closes the coupling 45 with the cam of gear 44.

 When the cams 2 converge, the bar should not be extended; for this purpose, a cam sleeve 45 with bevelled teeth is inserted into the feed mechanism, which transmits rotation only in one direction. The crowns 17 and 18 cover the block brakes 49 and 50 (Fig. 9), controlled by the knobs 51 and 52. The brake force can be adjusted by springs 53 and 54. The second feed screw to 34 (Fig. 6) receives rotation. 38 with internal teeth.

 through parasitic bristles 39, shaft gear 37, gear 55 and gear 30, on the hub of which sits a worm to 34.

0 Transfer ratios with the divergence of the cams, their convergence and bar feeding will be next.

The gear ratio of the transmission during the divergence of the chuck jaws at the frequency of rotation of the pip spindle and the number

1 turn of a flat spiral - will be

Lmo.Psp 1- | § where the numbers 4, 11, 18 and 20 respectively mean conventionally the number of teeth on gears, designated by the positions 4, 11, 18 and 20, t. E. The digit of the position indicates the number of teeth of the pinion (Fig. 5). This designation will continue to apply.

The gear ratio of the transfer in time of 5 m of the chamfer jaws between the spindle turns of the machine and the turns of the flat helix will be (Fig. 3)

Pyp 1

 PGT

The gear ratio of the transfer between the flat spiral 3 and the feeding right worm 33 will be (Fig. 1)

Psp

Pcherv tl-iS-Sf-iO

1 where P cd is the number of revolutions of the flat helix;

- feed speed

P

tepft

Claims (2)

right worm The gear ratio of the transfer between the flat helix 3 and the feeding left worm 34 will be (Fig. 1 and 6) Psp .i, 5g 5839-55 - Н-г538-53-ЗГ-50 Bar feed occurs simultaneously with the unclamping of the cams, while the brake 49 (Fig. 9) is clamped, and the crown 18 is braked. Ec.iii chose a sufficiently large transmission ratio, the cam discs are not significant, and the bar feed is large enough, which is required for machining 1) 1 our () parts. Universal cartridge works as follows. A machine operator inserts into the hole the spies of the machine case with a cork billet for processing. The manra; 1 cones 31, located on the axles of the feed screws, provide an easy bar passage to the screws 33, 34, extending them sideways from the center of the spindle axis of the machine so large that it allows the passage of the largest bar diameter in the machine spindle. The feed worms have their own defined, but different in size due to different revolutions, step with cross grooves that form sharp teeth on the coils of the worms, they cut into the rod and prevent the worms from slipping relative to the rod, ensuring its stable feed, like screw and nut. In addition, from the side of the bar entrance, the screws 33, 34 have a conical intake part, through which the bar passes, the transition from the maximum diameter of the guide cones 31 to the diameters of the feed screws 33 and 34 and the field of the holding roller 35, whose diameter is somewhat larger. Clamping the screws 33 and 34 and the feed roller 35 is effected with the help of springs 36. Next, the machine operator starts up the machine, brings the handle 51 to itself and into the upper position, while the brake 49 brakes the crown 18, the bar moves out of the cartridge to the specified value or stop. The extension of the bar on the machine’s run by the required amount occurs when there is very little divergence of the cams, for example, when the cam deviates by 1 mm, the bar leaves the cartridge at 120mm at a rotation frequency of 1000 rpm, this takes 0.5 seconds. This is ensured by a large; downstream relationship in the kinematic chain from the inhibited crown 18 to ilosKiii cinipa.; IH 3. The flat helix 3 rotates slowly and kinematically connected with the other worms. bar feeder. This facilitates the work of Bceij;: a fader and permits npnMcneime bearings, sc, 1, zhen. Lowering the handle 51 downwards, the machine operator stops feeding the thread. For clamping a pruzhka, the machine operator takes care of the handle 51: brakes 50 and holds it until the cams are clamped ;; 1kiptka. When the bar is clamped by the cams but the uuoHUie worms do not rotate, the i-bar does not extend, it only laps together with the grotto, since the pro / cat between I.Ci.iaioriiiiiii is the worm kahp 33. 34 and the 35 sleeve with the springs 36. This The devil: 1 heals L1ofta 45. which only allows movement in one position on the board. The end signal is clamped and the reduction of the pdelkann teeth on the coupling 45. Then you need to lower the handle 52 downward to the mechanical processing of the specified part. The clamping of the cams, their mode and the supply of the bar is done by turning on the handle 51 and 52. The handles are insignificant, within 0.5-3kg while the springs 53 and 54 clamp the brakes 49, 5 (1. Adjustment with these springs ; gives the possibility of splitting the part of the clamp on the cams, which is suitable for processing both rods and thin-walled tubes. 1. Fist-type clamping chuck, in the case of which there are clamping jaws with a radial circumferential drive and bar feeder different that, in order to ensure reliable clamping and feeding of the bar in the psokom range of fixed diameters, the bar nodaciu mechanism is made in the form of spring-loaded one support roller and two feed screws with cross-cutting placed in the case of the cartridge on the axles, and the drive of the worms is made in i.e. the braked co.MieHHoro wheels installed on the cartridge case and K1 of a nematic gear box with clamping ku, p1 and black and 15; so that the rotation of the screws in the opposite CTCjpoiibi is possible only with the clamping jaws “Pa zazh and m 2. The patron of claim 1, which differs in vcv .. that. in order to ensure the possibility of refueling novogs; . The axes of the feeders and roller are equipped with KOHVcaMH guides. and rolpk and werk issue (), 1neny with intake parts. Sources ipformatspi, pri.n. those in vpi, nry expertg. 1. Mitrofanov, S.P. dr. Revoly ;;: - ph, 1c machines and their rations. ibiuje 1 and: and |. , M.,. liMiK with. 12th dii;: -. 2.16. 15 W17 5 W / / / 7 W20 IS L & - & i1 t 5 Fig 7 LA