US2138268A

US2138268A - Brake drum machine

Info

Publication number: US2138268A
Application number: US96417A
Authority: US
Inventors: Charles W Dake
Original assignee: Campbell Wyant and Cannon Foundry Co
Current assignee: Campbell Wyant and Cannon Foundry Co
Priority date: 1936-08-17
Filing date: 1936-08-17
Publication date: 1938-11-29
Anticipated expiration: 1955-11-29

Description

Nov. 29, 1938. I c. w, DAKE BRAKE DRUM MACHINE Filed Aug. 17, 1956 2 sheets-sham. 1

Nov. 29, 1938. c. w. BAKE 2,138,288

BRAKE DRUM MACHINE Filed Aug. 1'7, 1936 2 SheetsSheet 2 UNITED STATES PATENT OFFICE 2,138,268 BRAKE DRUM MACHINE Charles W. Dake, Grand Haven,

Wyant & Cannon to Campbell,

Mich., assignor Foundry Company, Muskegon, Mich., a corporation of Michi- Application August 17,

8 Claims.

This invention relates to mechanism or apparatus used in the manufacture of brake drum shells and particularly those shells which, after they are formed,

may be lined with a braking lining of a difierent material than the shell.

Brake drums of a made.

I have heretofore m method of producing sai in an application, Seria l6, 1936. The method of ade application for the d steel brake drum shells 1 No. 69,020, filed March said pending application. The present application may be considered a continuation in part tion.

lined with a cast iron liner, drums may be produced,

of such prior applicatwo finished brake though it will be evident that a shell for one completed brake drum only might be made without departing from my invention.

An understanding of theform of apparatus embodying the same, may be had from the following description taken in connection with the accompanying drawings, in

which:

apparatus.

Fig. 3 is a. similar pletion of the brake Fig. 4 is a plan view section showing the comdrum shell forming, and

of the die into which the metal is pressed to form the shell.

Like reference characters refer to in the difierent figures The die which is used like parts of the drawings. I includes a die support invention, and one- 1936, Serial No. 96,417 (Cl. 113-43) tions 2, three of the sections being shown and inserted into the support I, thereby providing a die having a substantially cylindrical interior recess at the bottom of which is a pilot opening 3. Around the pilot opening is an annular depression 4 and in the vertical walls of the cylindrical recess, spaced apart continuous grooves 5 are provided as shown. The upper sides of the die sections 2 at their tions have horizontal ledges 6 in the same plane with the upper side of the die support I. Within the horizontal ledges 6 are upwardly extending ribs 1, the three ribs 1 of the three die sections make a continuous upwardly extending rib entirely around the vertical cylindrical recess in the assembled die.

On a support 8 a hydraulic cylinder apparatus is positioned. It includes an upper cylindrical section 9, at the lower end of which is a somewhat larger and shorter cylindrical section In, and below which is a still larger cylindrical section II. The inner wall of the section III is ma chined out at its lower portion providing an annular shoulder l2. Likewise the inner wall of the section II is provided with a similar shoulder' l3 while the upper cylinder 9 has a continuous shoulder M at its upper end. Above the shoulder I4 is a relatively short cylindrical recess l5 .to which'an inlet pipe l6 leads having a control valve I! in its length. Similarly, above the shoulder I2 is a cylindrical recess ill with a pipe l9 leading thereto and a control valve 20 in said pipe. Above the shoulder I3 is a cylindrical recess 2|, a'pipe 22 with a control valve 23 therein leading thereinto as shown.

Within the lower section II a die punch 24 is mounted having a cylindrical outer surface received within the section II and having a central cylindrical opening therethrough. Around the lower end of the central opening the metal is cut away to provide a surrounding annular recess 25 at the upper part of which, and around the central opening through the punch 24, is a continuous annular recess 21, the walls of which are of upwardly and inwardly concave form as shown. By cutting the annular recess 25 there is left a downwardly projecting rib having a horizontal underside 26 which, when the punch 24 is moved downwardly, seats upon the ledge 6 of the assembled die, with the rib I received within the recess 25. v i

A second die punch 28 in the form of a sleeve has its upper end portion received within the section In below the annular shoulder and extends downwardly through the central opening outer peripheral porof the outer punch 24. Within the sleeve 28 is a central punch 29 of substantially solid construction; At its lower end it is equipped with a downwardly extending pilot 30 of a diameter such as to be received within the opening 3 of the assembled die and with an annular surrounding tapered section 3| complementary to the annular recess'4 around the opening 3 in the die. All of the cylindrical positions or

sleeves

29, 28 and 24 may be equipped with suitable sealing rings so as to retain oil which is pumped under pressure into the recesses l5, l8 and 2| above the several punches.

The inner punch 29 has an opening 32 from its upper end downwardly therethrough to within a short distance of its lower end and with horizontal branches 33 extending radially outward from the lower end of the opening 32 to the walls of the punch. A pipe 34 is connected with the upper end of the punch 29 in conjunction with the opening 32 and passes through a suitable stuffing box packing construction 35 at the closed upper end of the upper cylindrical section 9. A control valve 36 is located in the length of the pipe 34.. It is to be understood that as the punch 29 is moved described, the pipe 34 moves with the punch through the packing at 35 and that the valve 36 is located sufiiciently high that it will not come to the stuffing box when the punch is in its lowermost position.

' In the operation of the apparatus, a hat cir cular plate 31 of suitable material such as a low carbon steel is laid over the annular rib I. The plate has a central opening to receive the lower reduced end 30 of the punch 29 as shown in Fig. 1 to thereby properly locate the plate. The first operation is to open the valve at whereupon oil or other liquid under pressure is forced into the upper section 9 above the punch 29, moving the,same downwardly until the pilot end 30 enters Qthe opening 3 in the die assembly. When this seems the central portion of the plate 31 is shapedqinto a web or back 38 (Figs. 2

and 3) while the outer portions of the plate provide an upwardly and outwardly inclined continuous wall 39, the upper edges of which extend above the ribs 1.

The next operation is to open the valve at 23 whereupon the outer punch 24 is moved downwardly, the ribs 1 of the die assembly entering the annular recess 25 and the lower side 26 of the punch seating on the ledge 6 to make a tight sealing contact. At ,the same time the upper edge portions of the annular side walls 39 are moved inwardly by their engagement with the concaved walls of the annular recess .21, thereby turning the metal inwardly .to the position indicated in dotted lines at 40 inEFig. 2.

The next operationis to open the valve 20 whereupon the intermediate sleeve punch 28 moves down to the position shown in- Fig. 3., This engages the incurved annular portions indicated at 40 and bends the same inwardly to make a continuous inwardly extending annular flange 4|.

After these operations have been performed the'valve at 36 is opened and oil under very heavy pressure passed through the

passages

32 and 33 draws to press the metal against the walls of the die and into the grooves 5 thereof as shown in Fig. 3. The inclined wall 39 thereupon becomes substantiallyvertical as at 39a in Fig. 3 with continuous annular ribs grooves 5. This completes the shaping of the downwardly, as will be later 42 pressed into the plate 31 into the form desired and provides a drum shell which, in accordance with previous practice, may be heated to a high degree of temperature, rotated in a suitable fixture and have molten iron at a very high degree of temperature deposited in the continuous annular trough between the after which the composite structure produced may be divided between the ribs 5 and a suitable back welded or otherwise secured to the flange fiange 4| and the back 38,

ceeding operation. The die assembly with the I shell therein may then be removed from the supporting block I and the sections of the die disassembled from the drum shell to release the formed shell.

The apparatus described is an efiective apparatus for readily, producing sheet metal drum shells in accordance with the method disclosed in my earlier application. While a hydraulic operation of the punches has been shown and described, the invention is not to be limited thereto as there are many other ways in which the movements of the punches may be attained.

The invention is defined in the appended claims and is to be considered comprehensive of all forms of structure coming within their scope.

I claim:

1. In an apparatus of the class described, a die having a substantially cylindrical recess therein over which a fiat plate of metal of greater diameter than the diameter of the recess is to be placed, a punch, means for operating the punch to press the plate of metal into the die, with the outer portions of the metal extending upwardly, in more or less spaced relation tothe sides of the recess, and having edge portions extending above the upper side of the die, a second punch outside of the first punch, means for operating the same to engage against the upper edge portions of said metal and curve the same inwardly, a third punch located between the first and second punches, means for operating the same to engage said incurved edges of the metal to bend.the same into a flange, and means for exerting pressure against the metal thus formed to conform it to said die recess, substantially as described.

2. An apparatus for forming from plates of fiat metal comprising, a die having a recess of a desired shape over which a plate of flat metal is adapted to be located, a punch for forcing the metal into the die so that a portion of the plate will be spaced from the sides of said recess, a second punch located around the first punch for seating against the upper end of the die and-sealing the same, a third punch surrounding the first punch and between the same and brake drum shells 3. In a construction of the class described, a

through said punch for conducting liquid under 4 4. Apparatus of the class described comprising.

a die having a recess therein over which die and recess a fiat plate of metal is adapted to be placed, a punch ereagainst, exerting pressure upon the metal to conform the same to the walls of said die recess. 5. In an apparatus for forming brake drum shells comprising among its elements a die having a recess therein conforming to the outeriperiphery and supporting back of a brake drum shell over which a metal blank from which to form the said brake drum shell is placed, a punch for forcing a portion of said blank into the recess of the die, a second punch engaging the edge of said punch for forming the shell to conform with the g5 interior of the die.

6. In an apparatus for forming. brake drum shells comprising among its elements a die having a recess therein conforming to the outer periphery, a brake drum shell over which a metal blank from which to form the said brake drum shell is placed, a punch for forcing a portion of said blank into the recess of said die, a second punch engagedge of said blank periphery of the first named punch for forming the shell to conform with the interior of the die.

7. In an apparatus for forming brake drum shells, the said apparatus including a die having an annular recess therein and an annular wall conforming to the outer periphery of the brake flange at one side of said shell and means for producing fluid pressure within the said die and around the first named punch for expanding the said partly formed shell within the die.

CHARLES W. DAKE.