US1165174A - Mechanism for operating tables for forging-presses, shears, &c. - Google Patents

Description

v T. E HOLMES.

MECHANISM FOR OPERATING TABLES FOR FORGING PRESSES, SHEARS, &c.

. APPLIEATION FILED MAR. 24, 1913.

1,165,174. Patented Dec. 21, 1915.

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MECHANISM FOR 0P To $1.2 R

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I= F in T. E. HOLMES. ERATING TABLES FOR FORGING PRESSES, SHEARS, &c.

APPLICATION FILED MAR. 24. 1913.

- Patented Dec. 21, 1915.

3 SHEETS-SHEET 2.

INVENTOR.

COLUMBIA PLANOGRAPH CO.,WASHINGTON. D. c.

T. E. HOLMES.

MECHANISM FOR OPERATING TABLES FOR FORGING PRESSES, SHEARS, &c.

APPLICATION FILED MAR. 24, I913.

Patented Dec. 21,1915.

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M I N WITNESSES N \s MC/WIET \fl CDLUMBIA PILANOGRAPH CO.,\VASHINOTON, DI c.

, U -l STATES FFTC.

THOMAS EDlVIUND HOLMES, OF SHEFFIELD, ENGLAND, ASSIGNOR T UNITED ENGI- NEERING AND FOUNDRY 00., OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

MECHANISM FOR orniaa'rrne TABLES For. rename-reassess, srrnans, 8m.

Specification of Letters Patent.

Patented Dec. 21, 1215.

Application filed March 24, 1913. Serial No. 756,430.

To all whom it may concern 7 Be it known that I, THOMAS EDMUND HOLMES, a subject of the King of Great Britaim-andresident of Sheilield, England, have invented a new and useful Improvement in Mechanism for Operating Tables for Forging-Presses, Shears, ,&c.; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to table operating mechanism for forging presses, shears, or other devices to which it may be found applicable.

I The main object of my invention is to provide deflecting or falling tables whose movement is controlled by the movement of the press-head, shear or other moving member, whereby the tables are lowered a predetermined proportion of the amount the moving member descends under power.

To these ends my invention consists, generally stated, in table operating mechanism comprisin the cylinder which operates the moving-member, movable tables, and mechanism for lowering said tables operated by the downward movement of said moving member, whereby said tables will be lowered an amount corresponding to the descentof said member under power.

In the accompanying drawings Figure 1 is a plan view of my invention applied to a forging press; Fig. 2 is a vertical side elevation of same; Fig. 3 is a view showing the parts in the position when the forging operatlon takes place; Flg. l is a cross-section on the line H Fig. 2; Fig. 5 is a detail of a valve showing the different connections thereto; and Fig. 6 shows my invention applied to a shear.

In the drawing the numeral 2 designates the base-plate which is bolted or otherwise secured to the foundation 3. Upon the base 2 is the support l which carries'the anvilblock 5. Supported on the base 2 are the columns 6. The cross-head 7 is fitted to move up and down on the columns 6. The press-head or top-tool 8 is carried by the cross-head 7. 'The pressing cylinder 9 contains the ram 10 which is connected up to the I cross-head 7. The inlet 11 is provided for fluid to the pressing-cylinder. Lifting cylinders 12 are arranged on each side of the press for lifting the press-head in the ordinary manner.

Supported on the base 2 are thecylinders 13 and 13 at opposite sides ofj the presshead. The rams 14 of said cylinders 13 and 13 are attached to the cross-head 7 and said rams are raised and lowered by the movement of said cross-head. The cylinders 13 and 13 are connected up to the tank 15 by the pipes 16 and 17, respectively. During the initial movement of the press-head, and before the increased pressure due to the intensifier acts on said press-head to perform the forging operation, the water contained within the cylinders 13 and 13 will pass to the tank 15 for the reason more fully herelnafter set forth. Valves 1.9 and are located in the pipes 16 and 17 and the construction of said valves is illustrated in detail in Fig. 5.

A pipe 21 connects up with the valve 19 and said pipe leads to the cylinder 22. The pipe 21 leads from the valve 19 to the tank 15. The piston-r0 23 of the cylinder 22 is connected with the ram 24L of the cylinder 25.

By these cylinders 22 and 25 themechanism' for raising and lowering the table 26 is operated and this mechanism consists of the following parts: The arm 27 is carried by the shaft 27 mounted in the brackets 28. The other end of the arm 27 is connected to the linln 29 connected to the table 26. An arm 30 is connected to the rod 31, and at its lower end to the piston-rod 23. The rod 31 is connected to the arm 32. One end 33 of said arm is connected to the piston-rod 34: of the cylinder 25. The arm 35 is mounted on the shaft 35 and is connected at its opposite end to the link 36 attached to the table 26.

The table 26 is provided with the ordinary rollers 37.

The pipe 38 is connected up with the valve 20 and said pipe is connected up with a cylinder 22. As the mechanism for operating the table 39 is the same as that illustrated and described in connection with the table 26, it has not been deemed necessary to refer to the same in detail as the same reference numerals are applied to, each.

The rollers of the tables 26 and 39 are A tank 43 which is ordinarily called the Pressure in tank 15 is greater than in tank pre-filler is charged, with air and water a under suitable pressure, and serves as a reservoir from which water can be drawn or to which it can be returned to make up for the displacement of the main ram 10. A pipe 4% is connected up with the tank 13 and to a suitable valve 15, essentially a check valve, normally allowing water to flow from the pre-filler but arranged to be opened mechanically to allow water to be returned to same at the proper time, which controls the supply from the tank -13 as well as from the intensifier 46. A pipe 17 connects the valve 45 with the pressing-cylinder 9.

The intensifier may be of. any suitable constructionand as it forms no part of my invention, it has not been deemed necessary to illustrate the same in detail. A pipe 48 leads from the intensifier to the valve 4:5. Furthermore a pipe 4-9 connects the valves 19 and 20 up with the intensifier or the pipe leading therefrom.

A tank oraccumulator 50 is connected up by the pipes 51 and 52 to the cylinders 25 and this pressure acts under normal conditions to maintain theftables 26 and 39 in their raised position until this pressure is overcome in the manner hereinafter set forth.

. In the operation of forging, the piece to beforged is placed on one of the tables and is fed from. any proper position with reference to the press-head. The initial movement of the press-head s obta ned by exhausting the steam pressure from the lifting in contact with the piece to be forged, the

steam is admitted to the intensifier and the closing of valve 15 cuts off the supply from the pre-filler 13. As soon as the pressure is admitted to the intensifier the fluid in the pipes 48 and 17, as well as in the other pipes, is compressed and this increased pressure is imparted to the ram of the press-head and the pre'sshead' is forced so as to squeeze the metal held between the upper and lower press-heads. At the same time that the intensifier is put in operation, the pressure exerted by the same through the pipe 419 closes the ports in the valves 19 and 20 which communicate with the tank 15.

-13, andconsequently valves 19 and20 are normally open, 7 hen the intensifier 4E6 forces .high pressure water into pipe 48, the valve 15 closes and the high pressure water also enters pipes 49,"and overcomes the pres- I sure tending to keep the valves 19' and 20 open, and thus closes 'said valves; -This closing of the ports leading to the -tank 15 forces the fluid from the cylinders13 and 13 through the pipes 21 and 38 to the cylinders This'takes place as soon as the forging operation begins, the cylinders 13 and 13 being brought into communication with the pipes 21 and 38. Accordingly the water in this pipe-system is compressed and the pressure operates on the pistons in the cylinders 22 which overcome theip'ressure in the cylinders 25 fromthe accumulator or tank 50, so that the-fluid in the cylinders 25 is forced back into the tank 50. This movement of the piston-rods23 and:3'-1 will 'act to lower the tables 26 and 39through the connection hereinbefore described, so that said tables are lowered an amount corresponding practically tothe amount thatthe ,press-head descends under-the pressure exertedby the intensifier,,and as'the presshead rises, the tables, under the influence of the accumulator pressure, again rise to their initial position to allow the piece which is being forged to be moved forward for another stroke of the press.

In Fig. 6 I have illustrated my invention as applied to a steam hydraulicbloomfshear of the down-cut type. In this shear the table would only be'required on one side opposite the hold-down,.or the back-of the shear. The cross-head 61 is fitted to move on the column 62. The cylinder 63 contains the ram 63 which is connected to the crosshead 61. The upper knife 64- is carried by the cross-head 61 and the lower knife by the base 65. An ordinary hold-down 66 is provided. In operation the table will be lowered an amount slightly in excess of the travel ofthe head under the intensifier pressure, instead of'half this amount as in the forging-press. '\Vhat I claim is: v I p 1. In table operating mechanism, the combination of a head, means for lowering same,

7 a movable table, and fluid-pressure operated means operated by the lowering of said head under power to lower said table.

1 2. In table operating mechanism, the combination of a 7 head, means for lowering same, a fluid-pressure sustained table, and

fluid-pressure operated means .operatedby the lowering of said head under powerto overcome the fluid pressure sustaining said table.

In table operating mechanism, the combinationof a head, means for lowering same, a movable table, and fluid-pressure, operated means for lowering said table an at of the amount corresponding to the amou descent of said head under power. 1

4. In table operating-mechanisnnthe coin-f bination of a' pressing cylinder, a head adapted to be lowered thereby,a cylinder, a ram therein, connections between said ram and said head, a tank, connections between said tank and said second cylinder, a valve controlling said connections, said valve be ing open to said reservoir during the initial movement of said head, an intensifier, connec-tions between said intensifier and said pressing-cylinder, connections between said intensifier and said valve, whereby said valve is closed to said reservoir by increased pressure caused by said intensifier, a table, atable operating cylinder with fluid pressure therein normally sustaining said table, and means for directing the fluid-pressure from said second named cylinder to said table operating cylinder when said valve is closed to overcome the table sustaining pressure, whereby said-table is lowered.

5. In table operating mechanism, the combination of a pressing cylinder, a head adapted to be lowered thereby, a cylinder, a ram therein, connections between said ram and said head, a tank, connections between said tank and said second cylinder, a valve controlling said connections, said valve being open to said reservoir during the initial movement of said head, an intensifier, connections between said intensifier and said pressing cylinder, connections between said intensifier and said valve whereby said valve is closed to said reservoir by increased pressure caused by said intensifier, a table, a table operating cylinder with fluid pressure therein normally sustaining said table, lever mechanism, a piston in said cylinder, con nections between said piston and lever mechanism for raising and lowering said. table, a cylinder in tandem with said oper- Copies of this ating cylinder, a piston connected up to the piston of said table operating cylinder, and connections between said second cylinder and said valve, whereby the fluid pressure in said second named cylinder is forced through said valve into said tandem cylinder to overcome the pressure in said table operating cylinder to lower said table.

'6. In table operating mechanism, the combination of a pressing-cylinder, a head adapted to be lowered thereby, a cylinder, a ram therein, connections between said rain and said head, a tank, connections between said tank andsaid second named cylinder, a valve controlling said connections, said valve being open to said reservoir during the initial movement of said head, an intensifier, connections between said intensifier and said pressing cylinder, connections between said intensifier and said valve whereby said valve is closed to said res ervoir by increased pressure caused by said intensifier, a table, tandem cylinders, a rod, connecting the pistons of said tandem cylinders, one of said tandem cylinders normally sustaining said table, and connections between the other of said tandem cylinders and said valve, whereby the fluid in said second named cylinder is forced through said valve into said other of said tandem cylinders to overcome the pressure in the table sustaining cylinder.

In testimony whereof, I, the said THOMAS EDMUND Homrns, have hereunto set my hand.

TlHOliliraS EDMUND HOLME Witnesses LUTHER J. PARK, RICE K. EVANS.

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Washington, D. C.

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