US1695476A - Process of countersinking holes in metal - Google Patents

Description

Patented Dec. 18, 192 8.

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PROCESS-E oounrnnsmxmeinonns IN-"METAL. f

Application filedDecember 19,1927. Serial No. 241,023.

This invention relates to a process of coun= 1 tersinking holes in metal plates.

The chief featureof the invention consists in forming thecountersunk portion oftheg the plate in the die with respect to the conihole prior to the formation of the hole itself,

and thereafter forming the hole Within the countersunk portion andto the desired outline.

The full nature of the invention will be understood from the accompanying drawings and thefollowing description and claim:

In the drawings Fig. 1 represents a plan view of a sheet of metal. Fig. 2 is a central sectional view thereof. Fig. 3 is a top plan view of the metal after the countersinking.

has occurred. Fig. 4: is a central section through the countersunk plate shown in Fig.

countersunk portion 115, the conical projecting portion116 and the wall 123 of the Band of the dies for securing the same. Fig. 5

is a top plan view of the plate with a counter the hole formed thereinand the dies for form-f ing the same. Fig. 7 is a view similar to Fig. 5 and shows a square hole instead of a circular hole. Fig. 8 is a viewsimilar'toFig. 6 with the dies omitted. Fig. 9 is a view similar to Figs. 5 and 7 and is of a plate having a countersunk hexagonal hole. Fig. 10 is a view similar to Figs. 6 and 8 with the dies omitted. Fig. 11 is a view similar to Fig. 8 andof a plate wherein the countersunk portion does not project from the opposite face but shows the walls ofthe hole flush with the face of the plate. Fig.12 is a view similar to Fig. 10 and shows the flush arrangement of the plate with the countersunk hole. Fig. 13 is a view similar to Fig. 6 of the plate with the walls of the countersunk hole flush with the opposite face of the plate.

In the drawings, 10 indicates ametal plate which is placed between a male and female. I die, the female die 11 having a conical hole or i recess 12 therein and the male die 13 having a the metal therebetween is caused to form a conical recess 15 in one face and a conical projection 16 upon the opposite face of the plate. For all of the several modifications shown herein the foregoing constitute the first and common step;

The metal plate 10 is thereupon positioned in a perforate die having the female portion,

17 with" a conical seat 18-adapted to receive the conical projection 16 and therebycenter cal recess 15; The die 17 has a flared open-' 1 ing 19 extending therethrough through which the severed portion 20 of the metal plate is projected. The male head 21 has-a'cutting portion 22 of the desired peripheral outline and the opening 23 is formed comp-lemen tarily thereto to receive the same.

As shown clearly in Figs. 5 and 6, the wall 23 of the opening is herein shown circular and concentric, or' coaxial with j the countersunk.

portion15. n In Figs. '7 and 8 the blank 110 includes the opening which herein is shown square.

Figs. 9 and 10 illustrate plate 210 having I the countersunkportion 215 coaxial with the and having a wall 223 wall 123 square similar to that shown in Figs. 7 and8,but herein the projection 116 is omitted and this is obtained by grinding the projection 116 from the face so that there is no projection upon the face opposite the countersunk face or by providing a die, see

Fig. 6, which willnot have the recess 18 .8

therein, but which will be square shoul-,

dered, or suitably formed so that the pro jecting portion 16 will he removed by the die head 22 in themeeting engagement of the 1 two die portions. The removal of this projection may thus occur simultaneously with v the formation of the hole in the countersunk portion.

Fig. 12 is similar to Fig.10, but show'sthe plate having a flush face opposite the coun-' tersunk portion. I F'ig. 13 is similar to Figs. 11 and 12, of the flush face type but of the plate shown in Figs. 5 and 6. v

While the invention has been specifically described and illustrated as including a conia Y I cal countersunk portion, it is, of course, to

be understood that the countersinking ne'ces sarily may have a pyramidal or any other plate to form a conical recess in one face and desired. outline, and where the terminology a projection upon the opposite face, and 10 conical is employed in the claim the aforethereafter removing the central portion of said disclosure is to be considered as equivathe recessed portion of the plate and all of the lent in interpreting the scope of said claim. projected portion upon the o posite face.

The invention claimed is: a In Witness whereof, I have hereunto affixed The process of counter-sinking holes "in my signature. metal plates, consisting of deforming the r a e V LOUIS G. WINKLER.

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