DE13459C - Thread milling machine - Google Patents

Description

IMPERIAL

PATENT OFFICE.

Thread milling machine.

The new machine is mainly designed to produce precisely fitting threads on gas and parts of water pipes, on pipes and sleeves, both internal and external threads to cut; but it can also be used for thread cutting on or in other objects be used with advantage.

The attached drawing shows:

Fig. Ι a view of the machine from above;

FIG. 2 shows a section along the line xx in FIG.

Fig. 3 is a partial front view of the machine on average;

Fig. 4 is a section along the line yy in

Kg · /;

5 shows a section through the bushing Ώ ¹ and through the workpiece provided with a thread;

Fig. 6 and 7, finally, other views of the sleeve D \

Fig. 8 explains the arrangement of the cutter disks and their guidance for cutting an external thread.

The principal parts, of the machine resting on the carriage A, which extends läfst move in the longitudinal direction in suitable guides on the racks B. The workpiece is clamped in the support C arranged on the frame B. The latter can be displaced on the front part of the frame in the longitudinal direction of the latter with the aid of the toothed racks attached to its lower side and the gear a ^{1 connected to a crank.}

In a transverse nut of the support C sits the block a, on which the clamping chuck for the workpiece, consisting of the two disks a ² and the connecting rods a ^{3, rests.} The lower disk a ² is loosely on the upper end of the rod u, which is firmly connected to the block α , passes through the support C and the sleeve ν and with its lower end on one arm of the ^one suspended from the piece '«1 Lever v ^l rests. The lever v ¹ carries at its other end the weight z / ² , by which the workpiece resting on the block α is balanced. The hole in the piece C for the rod u is elongated so that the block α can be moved freely in the transverse direction to the machine. The rod ti. is also vertical sliding, so the workpiece located in a clamp ^chuck% DAF a ^s of the cutters which cut the thread, is centrirt selbstthätig.

On the lower disk a ² diametrically opposite notches are made, in which the locking wedge r ^{2 is} inserted and in this way holds the workpiece which is rotatable about the upper end of the rod u , so that it does not turn around while the thread is being cut the vertical axis can rotate.

The workpiece is held in the clamping chuck with the aid of the clamping screw α ^i. In Figures 1 and 2, two different ways of clamping an elbow pipe in the clamping chuck are indicated, of which the latter is the most advantageous because the pipe does not need to be re-clamped if you want to cut threads in the other end.

The router k (best four) seated at the end of the shafts ^c%, c which are connected by universal joints, and by the rods c ⁱ with the waves.

The milling cutters can be rotated both about their own axis and about their common axis, while at the same time they are displaced with the carriage A also in the direction of their longitudinal axis.

The bearings hh ^{1 of} the shafts c are arranged in the covers bb ^{1 of} the bushing D. The sleeve D rotates in the ring P , which is firmly connected to the slide A by the piece b ^3, and is moved by the fact that the cover b of the same is provided with teeth on its circumference, Fig. 1, and this with that on the rotating shaft k ^l seated gear ^ · ^{3 are} in engagement.

The shafts c carry gears c ¹ at their rear end , which mesh with the teeth of the ring gear £ ² . When the sleeve D rotates about its own axis, the ring gear C ^ also rotates, but in the opposite direction to the rotation of the sleeve D. The shafts c rotate very quickly about their own axis, while the sleeve rotates only slowly.

The milling cutters can sit directly at the front end of the shafts c , but it is better to attach the same, as shown in ■ the drawing, to the ends of other shafts f ⁵ , which are stored in a second sleeve D ¹ and, as already noted, with The aid of universal joints and rods i ^{4 are} connected to the shafts c .

The sleeve D ¹ rotates in the ring b *, which is firmly connected to the slide A by means of the piece $ ^5. It is extended to the rear beyond the cover d ³ and carries on this extension a keyed gear c ^ß , which has the same diameter as the toothed cover b of the sleeve D and with the gear, j- ^{4 of} the shaft k ¹ in engagement stands. In this way, the two sleeves D and D ^{1 are} rotated at exactly the same speed.

The shafts c ⁵ rotate in chucks fi ^l and Ä ⁵ , which are stuck in the lids d ^l and d ^{3 of} the box D ^1. . The front chucks h ^{l are} inserted into slots in the cover d ³ , FIGS. 5 and 6, in such a way that they can be displaced in the radial direction. They are provided with flanges protruding over the front surface of the cover d ^z , which are provided with grooves on their circumference.

To these flanges is in. the Nuthen an elastic band z, Fig. 1 and 3, placed, which presses the lining / z ⁴ against the center of the lid d * .

The cover d ³ is attached to the sleeve Z * ¹ with screws.

These screws are inserted in the slots P, FIG. 6, of the cover d ³ , in such a way that the cover can be rotated somewhat after the screws have been loosened. By rotating the cover d ^3, the shafts c ^{5 are placed} more or less obliquely to the longitudinal axis of the sleeve D ¹ , which also results in a more or less oblique position of the milling cutter k . You can therefore make the thread to be cut steeper or less steep by rotating the disk d ^3.

Between the milling cutters k and the chucks A * , the shafts c ^{5 are provided} with the beads e ³ with which they rest against the conical end d ^{2 of} the rod d . This cone d ' ² pushes the milling cutters apart and presses them against the surface to be machined. When the thread has been cut, the rod d suddenly goes back and the elastic band i presses the milling cutters closer together so that they can be withdrawn with the carriage A without hindrance.

The rod d is inserted in the tubular sleeve d ³ and at its rear end rests in the guide d ¹ seated on the slide A. In this guide there is a pin which engages in a groove located on the rod d. This prevents the rod from rotating, but it can slide freely in the direction of its axis.

At its rear end is the rod d through the rail <? ² firmly connected to the pin o ^x. This conceives in a Nuth 0, which is arranged in the sleeve.

A spring / tries to pull the rod d backwards. If the pin o ¹ comes to the expanded point of the groove 0, FIG. 1, the rod d suddenly goes back. This happens at the moment when the thread has been cut and the milling cutter k has been moved closer to one another by the elastic band in order to be able to follow the backward movement of the carriage A.

The forward movement of the slide A is effected in the following way: The already mentioned sleeve m, which is not mounted on the slide A, but in a bracket P attached to the frame B and independent of it, is peculiarly profiled on its front edge. The roller η of the slide A presses against this edge, which is always pressed against the sleeve m by the spiral spring r ^3. The profile of the sleeve is such that the.

Claims (7)

Slide A is pushed forward evenly for a while while it is rotating, then the slide moves back quickly, and finally the slide also remains stationary for a certain time. During the last period, the worker can insert a new workpiece. ■ All moving parts of the machine receive their relative movements from the motor in the following way: The ring gear c ² sits loosely on the tube d ³ , in which the rod d is inserted. The gear wheel e ^{l is} keyed on the long hub e of this wheel. This . is in engagement with the gearbox £ ² sitting on the drive shaft f. On the hub e further is loose the dual wheel g ¹ g ² with the hub e. ³ G in the wheel engages the gear / ¹ and in the other wheel g ^1, k on the shaft ^x seated gear ² g a. The gears g ^s and g * seated on the shaft k ^x rotate the bushings D and D ^x in the manner described above. The worm q ^x , which rotates the worm wheel q sitting on the shaft / ^{2, is also} seated on the shaft k ^x. On the shaft / ^{2 there} is also the bevel gear p ¹ , which rotates the shaft / with the aid of the bevel gear m ^1. This shaft is located at the front in the bracket l ^x on which the guide d ^{1 of} the rod d sits and which is attached to the carriage A. The rearwardly lengthened hub of the wheel m ^{x and the sleeve ot 2} screwed onto the shaft / firmly hold the shaft / in the bearing l ^x so that it is forced to follow the to and fro movement of the slide A while it moves with it its rear end in the sleeve m can move freely in the direction of its axis. Thus, the sleeve m on the rotation of the shaft / takes part, both connected by Nuth and spring with each other. The drive shaft f rests in the bearings h ^% and A ⁵ and is moved by the belt and pulley / ² . If a bolt thread is to be cut, the arrangement shown in FIG. 8 is used. Here the beads c ^{s of} the cutter shafts rest on a central, elastic wheel s, which sits on a fixed rod s ^1. The milling cutters are pressed against the workpiece here with the aid of the conical sleeve t. If longer threads are to be cut, the forward and backward movement of the slide can be effected with the aid of a screw. Patent claims: i. In a thread cutting machine, the fastening of the tool on the carriage ^ while being BEZW workpiece to be machined on the means of the front of the rack B rack movable block C by the following means secured. can be regulated: a) the block a stuck in a transverse groove of C , on which the clamping chuck consisting of the disks a ² , the rods a ³ and the clamping screw a * , in which the workpiece is held, is seated; b) the rod μ in the dovetail-shaped sleeve ν for centering the workpiece and the weight levers v ¹ and v ² , which balances the same; c) the locking wedge r ² , which, engaging in the lower disk a ² , holds the clamping chuck with the workpiece in its respective position. 2. The cutting tools, their storage and movement mechanisms, namely: a) the milling cutters k at the end of the rods c ^b , which are connected to the rods c by rods c ⁴ with universal joints; b) the bearings h and h ^{1 of} the rods c in the covers b and b ^{x of} the rotating ones • sleeve D, which is mounted in the fixed ring on the support b ³ , and the bearings h ^l and h ^{h of} the rods c ^h in the lids of the sleeve D ¹ rotating in the ring b ^l on the support b ⁵ ; c) the cogwheel c ¹ at the end of each rod c, which, running in the ring gear of the ring gear c ² , gives the milling cutters k a very rapid rotation about their own axis; d) the equally large gears b and c ¹ , by means of which the sleeves D and D ^{x are set} in rotation, so that the milling cutters run around a common axis. 3. The devices for pressing the knife against the workpiece, namely: . a) when cutting internal threads, the elastic band i, which wraps around the bearings h ^l , which can move in radial slots in the covers d ^{3 of} the sleeves D ^x , and the beads c ^{3 of} the rods c ^h on the cone d ² advertises; b) when cutting external threads, the elastic wheel s, against which the beads c ^{z are} pressed by the conical sleeve t. 4. The devices for adjusting the knife in order to be able to cut more or less steep threads, consisting in the segmental slots « ¹ in the lids ^ ³ , through which the rods c ^{5 can be made} more or less steep. 5. The devices for retracting the cone d ² , so that the cutting discs can no longer cut into the workpiece, consisting in a groove o, in which a pin o ¹ attached to the rod d runs and is withdrawn by the spring / into a notch on that groove. 6. The devices for withdrawing the entire carriage, on which the cutting tool rests when the latter is to be moved out of the workpiece after the work is finished, consisting in a spiral spring n ² in connection with the roller n, which runs on the profiled edge of the sleeve m . 7. The devices for transmitting the motion of a motor to the various parts of the thread-cutting machine, consisting in a pulley / ² on the shaft f, from which the motion is transmitted: a) through the spur gear ratios e ² and e ^x to the ring gear c ¹ , whereby the milling cutters get the rotation about their own axis; b) through the spur gear ratios f ¹ ge ³ g "* g * g * on the wheels b and c ^s , through which the sleeves D and D ^{1 are set} in rotation; c) through the worm g ¹ the helical ¹ wheel g ² the bevel gears p ^x and ot ¹ on the sleeve m, the rotation of which causes the knives to be withdrawn from the workpiece and also to move the knives in the radial direction. The whole thread cutting machine, which consists of the under i. to 7. parts mentioned is composed. For this purpose I sheet drawings.