US1600174A - Forging machine - Google Patents

Description

Sept. 14 1926. 1,600,174

' A. T. HOLMAN ET AL FORGING MACHINE Filed April 4. 1925 H/L l i l 43 55 55 i! |I|I .mgm's Patented Sept. 14, 1926.

ARTHUR TREVE HOLMAN, 0F CAMBORNE,

PATENT OFFICE.

AND KENNETH JAMES HOLMAN, 0F GARBIS BAY, ENGLAND, AS SIGNORS 'IO HOLMAN BROTHERS LIMITED, OF CAMBORNE, ENG- LAND, A BRITISH COMPANY.

FORGING MACHINE.

Application filed April 4, 1925, Serial No. 20,714, and 111 Great Britain -.Tanuary 13, 19 25.

This invention relates to forging machines, and particularly to an improved valve mechanism for sequentially operating the work holding and forging mechanisms. The invention is herein described and shown as applied to the type of forging machine shownin British specification No. 5452/1924.

In machines of the type to which the present invention relates a pair of jaws or other work-holding members 1s provided, one of which jaws or members is movable by means of a piston-and-cylinder device towards the other. The jaws are adapted to hold between them the drill bit or the like while a reciprocating dollyor forging hammer operates on the end face of the bit or the like.

With such jaws there is'also generally and preferably associated a part WhlCh serves to forge or shape portions of the drill bit before end sharpening orshaping is effected by the dolly. v

The forging machine to which the present invention is shown herein as applied comprises the combination of a movable jaw with two pistons and-cylinders arranged 1n tandem, the pistons being both carried on asingle piston rod and serving jointly,when the dollyis to be used, to actuate the movable jaw'to close it on toor towards the companion jaw. I r

According to'the present invention in 'or for a forging machine having the characteristic features above referred'to, control means is provided for supplying driving fluid at will eithe'rj (at) To one'cylinder'alone (for example the' uppercylinder) 1 p Y Y (b) To both cylinders simultaneously; or (0) To bot-h cylinders and to the cylinder of the dolly hammer simultaneously,

When the two pistons abovere ferred to are associated with a third piston and cylinder constituting the meansv for, returning the *movable jaw tothe open position, the present invention further comprises the combi nation of a chamber to which driving-fiuid;

is supplied, a conduit which'isalways; in 0 en communication therewith and" with the cylinder of the'thlrd or return p ston,

and another conduit whichfislopen atoneend to the said chamber andfiat the other and leads to the control means above stated.

E sels/the sweetie-whees r s,

fluid is supplied is provided'by or support for the machine,

In order that the inventlon may be more. clearly understood, one preferred construca pedestal tion will now be described with reference to the accompanying drawing whi'chillustrates a central. sectional elevation of the machine in a plane transverse to that containing the axis of the dolly hammer.

The machine now illustrated is similar pistons are all mounted. on a; single piston rod 15. The two pistons 13 and114 serve when'required jointly to move the movable jaw, which is formed on or appliedtol the lower face of the upper piston 14, towards the fixed jaw constituted byor mounted vin the head of the cylinderllr The piston 31 serves as a return piston for opening the movable jaw.

These parts have: been given" the same reference numerals as were given in the prior specification and are in all their essentials similar in construction to those previously described.

The control means for the air supply; to the several cylindersis in the present inventiouas follows :--The pedestal 10 is formed as a hollow chamber into; which compressed airorother motive fluid .isladmitted through an orifice 40. This orifice is screw-threaded so; as to receive ascrewed I union vofia hose or other conduit through which the driving'fluid is conducted to the machine. In the lower end of the cylinder 32 there is an aperture 41 byr'which the cylinder 32 is maintained alwaysin-open jchamoer in the pedestal 10. 5

.Anoutlet -conduit r42 from the chamber leads through a port 43 iinto the cylinder 44 of a reciprocating piston controlvalve 45.

communication with the interior of'the air which make a substantially air tight sliding .fit'in the cylinder 44;

the cylinder 12 communicates with the valve The latter comprises :valvewstem having .two enlargedcylindricalport ions46 and 47 A conduit 48 leading to the upper endof' cylinder 44 through a port 49 anda conduit 50 leading tot-he upper end of the lower cylinder 11 also communicates with the valve cylinder t lthrough a port 51. j I

.A'nother port 52 opening intothe cylinder 445 communicates with a screw-threaded orilice 53 adapted to receive a hose orother conduit connect-ion leading to the cylinder 61 of the dolly hammer 62.

There is also a port opening into the cylinder 14 and communicating with an exhaust orificeee.

The end of the. valve s indle is formed as a rack which is engaged y a toothed segment -56 mounted on a rock shaft 57 which can be rocked aboutrits axis by means of a handle 58.

- It will be seen therefore that by movement 'of'the handle 58 the valve 45 can be moved to three control positions. In the position illustrated motive fluid is admitted through the conduit 42 and ports 13 and 19 to the conduit 18 and thence to the upper end of the cylinder 12. This will have the effect of moving the movable jaw down wardly onto the fiXGClj aw to impart a sharp blow to the bit or other work to be operated upon. During the admission of motive fluid to the'piston 12, that is to say in the position of the valve illustrated, the exhaust port 54: is closed off from the conduit 48 but isopen'ed to the'cylinder '61 "of the dolly hammer 62 through the port 52. Also the conduit 5 1 communicating with the lower cylinder '11 is "closed. By moving the bandle 58 in such a manner as to return the valve towards the left to the end or its stroke the air admission port 43 will be closed-and the port 49' will be opened to the exhaust port 51. The driving fluid is thereby released from the cylinder 12 and the return piston 31 then operates to raise the upper piston 14. Thus by rocking the control-handle 58 backwards and forwards -'betiveen the two positionsjust'described the upper piston 14 or movable jaw can be reciprocate'das rapidly as desired to impart a (succession o'f'blows to the work *which is positioned in the lower fixed jaw. I

when it is required to operate on the end face oft-he work'by mea'nsof the dolly hammer '62, it is found desirable to hold the :movable jawon to the work with'a relative sly great pressure, and for this purpose the control handle is movedso'that the enlarg'ed 43 thereby setting portion 16 of the valve 45 -opens not only 1 the poi-r 4.9but also the port 51 "to the -ad mission port 13. Consequently "driving fluid is admitted to both-ofthe cylinders 11 and It will be seenjthereifore that byineans of the control handle 58 the forging hammer or movable jaw piston can be reciprocatedto impart a succession of blows to the work by alternately admitting driving fluid to, and releasing it from, the upper cylinder 12.

Al-ternatively for heavier blows the handle can be rocked through a greater angle so as to admit the driving'fluid to both cylinders 11 and 12 simultaneously. It will be further seen that the dolly Fhammer 62 is not, and cannot be, energized until driving fluid is admitted to both cylinders 11 and '12 whereby. the work is gripped between the jaws with the "required pressure.

As a 'detail of construction it will be seen 7 that at the lower 'end'of the pedestal 1C there is a removable inspection cover by the removal-of which access is obtalned to the interior of the chamber in the :ped- J Although 'a particular form of apparatus embodying the present invention has been described in detail, it is obvious that many modifications may, be made in the construcand cylinders arranged in tandem, which 'pis'tons'are both connected. to said pistonrod and serve omtly to move said movable .jaw towards the companion jaw, a driving fluid supply conduit, three delivery condu ts whereoifzone opens into-one, the second opens into the other 01"? said cylindersandthe third is forco'nnection to the cylinder o'f'a reciprocating forging hammer arranged to -op "erate :on the work while it is held by said jaws, and-control meansfor controlling the supply of driving-fluid from said supply "conduit at will eitherto oneo-f the-twoffi-rstmentioned delivery conduits alone, "or. to

both of the same simultaneously, or to all three said ideliveryconduits simultaneously.

2. Atorging-machine-of'the character de scribed, comprisingin combination two opposed work-holding jaws, one at least of ,whichis movable relatively towards and.

,away from the other, a single piston-rod connected with the movable jaw, two pistons and cylinders arranged in tandem, which pistons 'a-re bothconnected tosaid fpis t'on-rod and serve jointly to move said movablejjaw towards thecompanion, jaw, a

V driving-fluid supply conduit, three delivery conduits whereof one opens into one, the.

second opensinto rtlieiotherof said cylinders ,and' thethird is for. connectionto thei'Cylv inder of a reciprocatory forging-hammer 1 3% ranged to operate on the work while it is held by said jaws, a three-position reciprocating valve for controlling the Supply of driving-fluid from said supply conduit at will either to one of the two first mentioned delivery-conduits alone or to both of the same simultaneously, or to all three said delivery-conduits simultaneously, and arackand-pinion device for operating said valve.

3. A forging machine of the character described, comprising in combination two opposed worlcholding jaws, one at least of which is movable relatively towards and away from the other, a single piston-rod connected with the movable jaw, two pistons and cylinders arranged in tandem, which pistons are both connected to said piston-rod and serve jointly to move said movable jaw towards the companion jaw, a chamber to which driving-fluid can be supplied, which chamber constitutes a pedestal for supporting the machine, a third cylinder always in open communication with said chamber, a third piston earned by said plstonrod and movable in the said third cylinder, a driving-fluid supply conduit which opens at one end into said chamber, three delivery-conduits whereof one opens into one and the other opens into the other of the two first mentioned cylinders, and the third is for connection to the cylinder of a reciprocatory forging hammer arranged to operate on the work while it is held by said jaws, a three-position reciprocating pistonvalve having a stem constituting a toothed rack for controlling the supply of drivingfiuid'from the other end of said supply-conduit at will either to one of the two firstmentioned delivery-conduits alone, or to both of the same simultaneously, or to all three said delivery-conduitssimultaneously, a toothed segment meshing with said rack, and a handle for oscillating said segment.

4. A forging machine of the character described, comprising in combination two opposed Work-holding jaws, one at least of which is movable relatively towards; and

driving-fluid from said conduit at will either to one of the two first mentioned delivery conduits alone, or to both of the same simultaneously or to all three said delivery conduits simultaneously, and for connecting one of the first-mentioned delivery conduits first to said supply conduit whilst shutting it OK from the exhaust port and then to said exhaust port whilst shutting it off from the supply conduit for reciprocating said piston-rod.

In testimonywhereof we have signed our names to this specification.

ARTHUR TREVE HOLMAN.

KENNETH JAMES HOLMAN.

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