US2005222A - Header slide - Google Patents

Description

June 18, 1935. A A W. w. CRILEY v 2,005,222

HEADER SLIDE Filed May 3, 1932 Patented June 18, 1935 ,f f l UNITED A.sTATifzs OFFICE The invention hereafter described relates to a header slide for a forging machine and has the particular purpose of impartingl a constant downward component .to the forward thrust of such slide in order to reduce the tendency of an end of the. header slide to kick up as occurs in forging operations where the greatest resistance is encountered below the horizontal plane through the wrist pin center. The header slide of this invention includes an extension bearing disposed at the rear of the crankshaft and a further purpose of the invention is to so place the guides for the extension bearing that the heavy pressures to which the guides are'subjected through the normal angularity of the pitman during rotation, and to a greater degree when work is performed in a position off the line through the wrist pin and crankshaft center line will be entirely supported by the machine frame to provide a rigid backing and prevent yielding or breaking loose of the guide bearings.

The type of machine in which such a header slide is used is well-known, an early illustration being found in the patent to Blackeslee, No. 364,208, issued June 7, 1887, in which the header slide C is driven from a crankshaft A by a pit-` man B.

To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawing and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In the accompanying drawing Fig. l is a side elevation of the header slide,with the side of the machine frame and the stationary bearings toward the observer removed, the crank pin and parts of the frame being shown in section. Fig. 2is a transverse vertical section on the line 2--2 of Fig. 1 in the direction of the arrows. Fig. 3 is a rear view on the line 3-3 of Fig. 1 in the direction of the arrows. Fig. 4 is a diagrammatic showing of the action of the mechanism, corresponding to Fig. 1.

A header slide or block I slidable in the machine frame 2 carries a tool holder in the pocket 3 and has a rear extension bearing 4 upon the end of a rigid and preferably integral bottom arm 5. The slide I is driven by the crankshaft 6 by means of a pitman 1 which connects the crank pin 8 with a wrist pin 9 in the header slide. A hollow I0 in the arm 5 clears the pitmanl. The

center line of the crankshaft 6, designated yas A-Ain Fig. l, is above thecenter line of thewrist pin 9, designated as B--Bin Fig. 1, and the shaft 6 rotates counterclockwise asindicated in that figure.v Thus during the forward or head- 5* ingstroke of the slide I, the thrust always in-r cludes a downward component, as more particularly illustrated diagrammatically in Fig. 4. This point will be developed hereafter.

-The header slide lI isguidedbyitstop flanges 1I)j so positioning `the rear extension bearing that 20# it can be entirely housed within the main frame 2. As a result the stresses on the bearing 4 are transmitted directly to the frame of the machine. In practice liners are used in the guide bearing,

but by the present construction, all liners are 25" directly backed by the machine frame, so that they cannot be sprung, and their securing bolts serve only to keep the liners in position and not to resist any of the heavy operation stresses.

The bearing 4 -is guided at top, bottom, and both 301:

sides. A convenient constructionof the guide elements is shown in Fig. 3, comprising bottom guide blocks 2l, 2I, a top liner plate 22 and side liner plates 23. All these are appropriately secured within the housing portion 20 of Athe 35' machine frame 2, but an important feature is that each of the elements 2|, 2I, 22 and 23 bears directly against an inner surface of 4the housing 20, so that the stresses on the bearing 4 are transmitted to the housing and there is no pos- 40 sibility of bending or loosening the guide blocks on the liners. Thus the strengthof the machine frame is directly availed of to keep the bearing 4 aligned.

Operations requiring the heaviest pressure are usually performed in the lower part of the die space, as indicated at E, Fig. 1. When these are in progress the header slide I tends to turn counterclockwise about the pivot at 9, as indicated by 50 the arrow H, Fig. 4, with a resulting upward kick on the vbearing 4. Lowering lthe wrist pin end of the pitman 1 causes the heavy work to be performed more nearly in line with the line through the center of the crankshaft 6 and wrist pin 9 55 when the crank pin 8 is passing over forward dead center.

This is diagrammatically illustrated in Fig. 4, in which the offset between the crank and wrist pin, represented by the vertical distance between the lines A-A and B-B, is somewhat exaggerated, and the length of the various elements is disproportionately shortened to illustrate the principle more clearly. In Fig. 4 the various parts are in- -dicated by the same reference characters as in Fig. 1. In this gure, to aid explanation, the work-holding dies have been indicated at D, the projecting portion of the work at W and a heading tool at E. The arrow C represents an arc of the crank pin circle. The line F-F and the points 8 and 9 indicate the relative positions of parts shortly after the beginning of the heading stroke. The line G-G and the points 8 and 9 indicate the relative positions when the crank pin is on forward dead center, after the finish of the power stroke.

In the operation of the machine, by reason of the lowered wrist pin, the pitman thrust always approaches the fixed straight line G-G from crank shaft center 6 to work W. Thus a downward component, affecting the slide 3 as suggested in Fig. 4 by the arrow J, is imparted during the entire forward throw of the crank. The forward impulse ceases when C crosses below G but the i downward impulse does not cease until pressure the machine to turn out accurate work for long periods without realignment of Wearing surfaces.

Other mode of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention:

1. In a forging machine, side guides therein, a header slidemovable within said side guides and having a transversely disposed operating crankshaft connected thereto by a pitman and a wrist pin, the center of said wrist pin being below the `center of the crankshaft, a tool on the front of said slide in advance of and below the levell of said wrist pin, an extension arm rearwardly disposed on said slide and carrying at its rear end a bearing, guiding means for said bearing entirely within the machine frame, all forces acting within lines of motion established by said side guides projected.

2. In a forging machine having a header slide and a rear extension bearing for said slide, a guideway for said bearing including walls defining an opening through the machine frame, top and side liners backed directly by said walls and a pair of bottom liners each 'being secured to one of said walls and being of greater height than the height of said extension said guideway having a height which is approximately twice the height of said extension, whereby upon removal of said pair of bottom liners said extension may be lowered, thus permitting removal of said top and side liners.

3. In a forging machine having a header slide and a rear extension bearing for said slide, a guideway for said bearing including walls defining an opening through the machine frame, top and side liners backed directly by said walls and a pair of bottom liners each secured to one of said walls and adapted to support and guide one side of the bottom of said slide, said bottom liners being of relatively greater depth than width, bolts securing said bottom liners to the machine but not taking any of the stress on said liners, the lateral spacing between said liners being greater than the length of said bolts said guideway having a height which is approximately twice the height of said extension, whereby upon removal of said pair of bottom liners said extension may be lowered, thus permitting removal of said top and side liners.

4. In a forging machine having a slide and an extension bearing for said slide, a guideway for said bearing defining an opening having top, bottom and side liners surrounded on all sides by the machine bed, and bottom liners for said bearing laterally separated, said bottom liners secured to a wall of said opening, horizontal bolts securing said liners in place, said liners each affording lateral clearance to the bolts of the opposite liner not less than the distance of engagement of said bolts into the machine bed, said bottom liners having a height approximately equal to the height of said extension and said guideway having a height which is approximately twice the height of said extension, whereby upon removal of said pair of bott-om liners said extension may be lowered, thus permitting removal of said top and side liners.

WILLIAM W. CRlLEY.

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