US1625748A - Machine for cutting or severing metallic bars - Google Patents

Description

April 19. 1927.

F. SCHIESS MACHINE FOR CUTTING 0R SEYERING METALLIC BARS Filed Jan. 25', 1923 Patented Apr. 19, 1927.

FRITZ SCHIESS, OF LICI-ITENSTEIG, SWITZERLAND.

MACHINE FOR CUTTING GR SEVERING- METALLIC BARS.

Application filed January 25, 19.23.

The present invention relates to a new and improved machine for cutting or severing; metallic bars and cutting or punching metal bars, sheet metal and so on.

The object of the invention is to provide an improved machine for the purpose stated which will produce a smooth fracture and no deformation of the parts of the bar, etc, adjacent the position of the break or cut.

I attain this and other objects by means of a machine having two pairs of dies inclcsing the bar etc. to be severed and means to move the dies of each pair with reference to each other and moreover one pair of dies with reference to the second pair.

A further feature of my invention consists in the means for closing the dies and moving one pair of dies with reference to the other by hydraulic means.

The preferred embodiments of my tion are shown in the accompanying ings in which,

Figure l is a sectional elevation of a machine constructed in accordance with my in vention.

Figures 2 and 3 are sections of the same re spectively on the lines E-F and Gl-l.

In the construction shown in the drawings a machine is shown adapted to pierce sheet metal of great thickness. In the base 40 a cylindrical die 41 is slidably mounted within a. guide block 42 fixed to the casing 40. The die 41 is connected to a piston projecting into a chamber 45. Said chamber 45 is connected by a pressure pipe 46 to a pump not shown in the drawings. Above the base 40 in a casing 46 two pistons 47, 48 are shown one, 48, Within the other 47. The pistons 47, 48 slide independently of each other. Piston 47 projects into a chamber 49 which is connected by a pipe 50 to a hydraulic pressure pum and piston 48 projects into a chamber 51 W ich by means of a pipe 52 is connected inven draw- Serial No. 615,131.

to another hydraulic pressure pump. Piston 48 operates a die 53 corresponding in di- 4 ameter to the diameter of the die 41' and to the diameter of the hole which is to be pierced in the sheet metal piece 54. Die 53 is screwed on to a spindle 55 which passes through a bore or piston 48 and through a 50 pipe screwed into the upper portion of the die 53. The upper ends of spindle 55 and of the pipe 56 are connected to a sleeve 57 on which a spring 58 acts. The said spring 58 tends to lift the dies and the piston 47. 55 The lower end of the piston 47 carries a pr s.) plate (50 of hard material with ad justable ring 61 said parts 60, 61 pressing the working piece 54 against press plate 62 of the die 42.

The machine works as follows:

After the piece 54 has been brought on the die 42 the pressure in chamber 49 is raised and the piston 47 is pressed on to the worlc ing piece 54. The pressure is raised up to a 65 point on which the piece 54 would be deformed. The pressure in the chamber 51 is raised above that point and is made to exceed that in chamber 45 in such a manner that the die 53 passes through the piece 54. The cut is quite clean. The means to vary the pressure on the several pistons are known to anyone versed in the art.

Having thus described my invention, what I claim as new is In machine of the-class described, the combination of a fixed die, a pair of independently operable dies opposite said fixed die, independently operable fluid pressure actuated means for actuating said independ- 80 ently operable dies, and comprising a pair of pistons, arranged one within the other and means to yieldingly resist the movement of one of said pair of dies.

In witness whereof I afix my signature.

FRITZ SCHIESS.

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