US2410742A - Power-driven bar-swaging machine - Google Patents

Description

Nov. 5, 1946.

A. P. NEwALl.

POWER-DRIVEN BAR-SWAGING MACHINE Sheets-Sheet 1 Filed July 7,1 1944 Nov. 5, 1946. A. P. NEWALL POWER-DRIVEN. BAR-SWAGING MACHINE 3 Sheets-Sheet 2 Filed July 7, 1944 Nov, 5, 1946. A. P. NEWALL POWER-DRIVEN BARSWAGING MACHINE Filed July '7, 1944 3 Sheets-Sheet 3 Patented Nov. 5, 1946 aliauz UNITED STATES PATENT QFFICE POWER-DRIVEN BAR-SWAGHNG MACHENE Archibald Park Newall, Glasgow, Scotland Application July 7, 1944, Serial No. 543,875 In Great Britain July 17, 1943 (Cl. '7S-20) 3 Claims. l

This invention relates to improvements in power driven bar-swaging machines of the rotary head type with controllable die members adapted to impact the circumference of bar stock fed axially of the rotary head, whereby to swage said bar stock to reduced diameter.

The invention has for an object to provide an improved construction of bar-feeding mechanism for a bar-swaging machine of the type referred to.

The invention provides in a machine of the type above set forth means for feeding the bar axially of the rotary head, in combination with means operative at preselected stations in the travel of the bar to determine the activity or inactivity of the dies, and means for varying the rate of feed of the bar whereby the -bar may be moved rapidly between said stations and at a lower speed during the activity of the dies.

An embodiment of the invention will now be described with reference to the accompanying drawings in which Fig. 1 is a side elevation, partly sectional, and broken to shorten the gure of a bar-swaging machine with bar-feeding and diecontrolling mechanism according to the invention; Fig. 2 is a face View of the swaging head with part removed for clearness; Fig. 3 is a sectional elevation; Fig. 4 an endview and Fig. 5 a plan of a tractor carriage later to be described; Fig. 6 is a side view to a larger scale ofpart of a swaged bar showing alternate swaged and unswaged portions.

The same reference characters denote corresponding parts in the several views.

Referring to Fig. 1 of the drawings, Il) indicates the body of a swaging machine of the rotary head type, which, although in part of known construction, will for the purpose of explanation be generally briefly described. II denotes the swaging head housing a die carrier I2 located at one end of the usual hollow shaft I3 rotatably mounted in roller bearings, one set of which is indicated at I4. Complemental swaging dies I5, I6 are mounted in the die-carrier I2 and adapted for intermittent sliding movement towards and away from each other under the impact of hammer in spaced relationship' rollers I'I arranged around a case I8 located in the head I I, see Fig. 2. I9', I9" are slide blocks each furnished with a roller 20', 20", respectively, adapted for rolling contact with the hammer rollers I'I. Interposed between the slide blocks I9', I9" and the swaging dies I5, I6 are wedge members 2I', 2|, each operatively connected at one end to a further hollow shaft `22 disposed for sliding movement in the hollow shaft I3.

The die controlling movement of the shaft 22 is elected by a hydraulic device consisting of a hydraulic ram including a cylinder 23 fitted with a piston 24 having a piston rod 25 operatively connected to one arm of a bell-crank lever 26 pivotally of the bush 5I.

mounted at 2 in a bearing bracket 28 situated adjacent to the outer end of the machine I0. The other arm 26 of the lever 26 is connected, as by a pin-and-slot connection, to the outer end of the hollow shaft 22. The ram is controlled by a hydraulic reversing relay valve 28' unitary with a double-armed lever 29 to the opposite arms of which are connected two endwise movable rods 33, 3I extending in parallelism with the track of va bar-feeding carriage 32. The aforesaid track is formed by pairs of channel- iron members 33, 34 carried by stanchions 35 arranged at; spaced intervals according to the length of track required and braced together to form a unitary trackcarrying bridge. The endwise movable rods 30, 3l are further supported by two-armed levers 29', 29" pivotally mounted on the respective adjacent stanchions 35. l

operatively associated with the hydraulic ram is a start-and-stop button limit switch for a motor-driven pump unit 33 which supplies pressure fluid (oil) to the ram through the medium of a hydraulic reversing valve 31 controlled by the relay Avalve 28. The supply of oil to the hydraulic ram is controlled to vary the speed of movement of the lever 26 by means of a throttle control valve 38 intercalated in the pipe line 39 to the relay valve 23. One side of the reversing valve 3l is piped at 46, lil respectively, to one side of the relay valve 23 and to the cylinder 23 below the piston 24. The other side of the reversing valve 3l is piped at A2, 3, respectively, to the other side of the relay valve 2B and to the cylinder 23 above the piston '2%. The reversing valve 3T is also piped at il to the sump of the pump unit 36,

and `the throttle control valve is piped at to the reversing valve 3l. The carriage 32 is provided with upper and lower sets of wheels 43, ll to run on the tracks formed by the channel members 33, 3d. The carriage 32 is provided with an adjustable bar-gripping chuck 43 rotatably mounted in ball-bearings its in the forward end of the carriage 32. The jaw members 5s of the chuck are movable relatively to the chuck body 58 by means of a push 5.! screwed into the body 8 and turnable by means of a tommy-bar inserted in one of a set of holes 52 in the flange The chuck body 48 is turnable by means vof a tommy-bar inserted in one of a set of holes 53 in the ilange 48 of the chuck body. To' retard ultra-freeturning movement of the chuck. there is provided a brake consisting of a metal block 54 with an arcuate face having a friction lining 55 yieldingly held in contact with the periphery of the ange d3 by means of springs 5% located in recesses 5l in the block 54 'and in holes 5S in the carriage 32, see Figs. 3 and 5. The holes 58 are normally closed by removable screv threaded plugs 59, see Fig. 3.

The carriage 32 is provided on one side with a projecting block 60 in which is slidably mounted a striker 6| projecting above and below the block 6D and adapted for movement transversely of the path of the carriage 32 by engagement with adjustable stop members or cams 62, 63, on the movable control rods 3U, 3|, respectively, of the hydraulic relay valve 28. The adjustable stop members or cams 62, 63 are mounted in spaced relation on the rods 30, 3| in positions which determine the length of the swaged portions of the bar stock relatively to the unswaged portions.

For effecting traverse of the carriage 32, there is provided a rotary lead screw 64 which is engageable by a split nut member 35 mounted in the floor of the carriage 32. The lead screw 63 is adapted to be driven by a variable speed electric motor 66 through the medium of speedreduction gearing 61. 'Ihe housing of the motor and the reduction gear is carried on a stand 68 at the end of the bridge. The electric motor 6B is speed-controlled by a control switch operated by a linkage |39 connected to the two-armed lever 23" of the endwise movable control rods 3|, 32, see Fig. 1.

The mechanism is so arranged that the carriage 32 travels quickly when the swaging head is not operating on the bar stock and relatively slowly while the swaging head is operating on the bar stock.

The split-nut member 85 of the carriage 32 is adapted for restricted vertical movement in a slideway 70. A stud 1| is secured in the nut member 65 with freedom for turning movement therein and projects upwards through a flanged bush 'l2 formed with a cam profile '13 on its upper face. The stud 'H is furnished with a handle i4 adapted to contact with the cam prole 'i3 whereby turning movement of said handle will cause the nut member 65 to be moved up or down in the slideway 10 to release it from or put it into engagement with the lead-,screw 64. When the nut member 65 is engaged with the lead screw 6, the handle 14 is engaged in a notch formed in the boss of the bush 12 whereby to prevent accidental displacement of the nut member 65.

In the operation of the machine one end of the bar stock A to be swaged projecting through the swaging machine IG is gripped by the jaws 5B of the chuck 48; the cams 62, 63 are set on the control rods 30, 3| in predetermined positions to govern the length of the swaged parts of the bar stock relatively to the unswaged parts; and the machine is started up.

As shown in Fig. 1, the parts are in the swaging position, oil from the pump unit 36 passing through the throttle control 38 via the pipe lines 39 to the relay reversing valve 2B', and thence by the pipe lines 42 and 43 and main reversing valve 31, is holding the piston 24 in its lowest position thereby causing the lever 26 to retain the wedges in operative position against the dies. Rapid rotation of the die-head 2 causes the dies l5, I5 to be subjected to recurrent blows as the rollers 23" are successively acted upon the hammer rollers l1".

The carriage 32 is drawn along the tracks by means of the lead screw 64 until the striker 6| abuts against a cam stop 62, thus moving the control rod 30 to actuate the reversing valve 28 to reverse the flow of oil to the cylinder 23. Oil then passes to the underside of the piston 24 via the pipe lines 4D, 4| and forces the piston 23 upwards whereby to rock the lever 26 and to cause the wedge members 2|', 2|" to be withdrawn to free the dies and permit the bar stock A to be drawn through said dies without being swaged. Further movement of the carriage 32 causes the striker 6| to abut against a cam stop 63 on the other control rod 3| to actuate the reversing valve 28 in the opposite direction and again reverse the direction of ow of the oil, whereby the wedges 2|', 2| are caused to return to operative position to hold the dies together. This reversing movement continues alternately as the striker 6| meets successive cams on the rods 30, 3|.

The mechanism is so arranged that the carriage 32 travels quickly when the swaging machine is not operating on the bar stock, and relatively slowly while the machine is operating on the bar stock.

After each feeding traverse, the carriage 32 may be restored manually to starting position by releasing the chuck, by causing the split nut member S5 to disengage itself from the lead screw 64, and by pushing or pulling the carriage back along the track to starting position.

What is claimed is:

1. In a bar-swaging machine of the rotary head type, with die members adapted to impact the circumference of bar-stock fed axially of said head whereby to swage the said bar-stock to reduced diameter, the combination of bar-feeding mechanism including a carriage, means for moving said carriage parallel to the axis of said head, a chuck tted to said carriage and engageable with said bar-stock, wedge members shiftable to render the dies operative or inoperative, an endwise movable hollow shaft coaxial with said bar-stock and operatively connected to said wedge devices to shift said wedge devices from die-operative position to die-inoperative position, a hydraulic device for effecting axial movement of said hollov.T shaft, said hydraulic device consisting of a hydraulic ram including a cylinder, a piston movable in said cylinder, a piston rod fixed to said piston and operatively connected with said hollow shaft, a pump unit having a pipe connection to said hydraulic ram, a reversing valve intercalated in the pipe connection between said pump and said ram, to control the operation of said ram, a, double-armed lever unitary with said valve, a pair of endwise movable rods extending in parallelism with the track of the carriage and connected to the arms of said lever, and means on said carriage operable in the travel of said carriage to move said rods alternately in opposite directions to reverse said valve.

2. In a bar-swaging machine, the combination claimed in claim l, including a carriage track extending parallel to the axis of the rotary head, a frame carrying said track, a lead screw journalled in said frame, a variable speed motor for driving said lead screw, a split nut member in said Ycarriage for engagementI with said lead screw, and a switchv for controlling the speed of said motor, said switch operatively connected to said endwise movable rods.

3. In a bar-swaging machine, the combination claimed in claim 1, including adjustable cam stops on the endwise movable rods, and a striker on the carriage engageable withsaid cam stops.

ARCHIBALD PARK NEWALL.A

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