US2093933A - Rolling machine - Google Patents

Description

Se t. 2l, 1937. c. w. SINCLAIR ROLLING MACHINE 2 Sheets-Sheet 2 Filed May 15, 1935 m mu vm INVENTOR CHARLES W. SINCLAIR A TTORNEYS Patentecl Sept. 21 1937 TES UNITED PATENT FFICE ROLLING MACHINE Application May 13, 1935, Serial No. 21,288

8 Claims.

This invention relates generally to rolling machines and refers more particularly to apparatus for rolling strip stock having angularly disposed portions to form an arouate section.

Although the machine forming the subject matter of this invention is capable of many and diversfied uses, nevertheless, it finds particular utility when employed for forming T-section strip stock into a brake shoe of arcuate configuration.

I-Ieretofore, in rolling T-section strip stock into an arcuate section with the stem or web of the T extending inwardly, oonsiderable dificulty has been encountered in preventing the web from buckling or from otherwise becoming deformed during the upsetting operation, and it is one of the principal objects of this invention to overcome this difiioulty by providing means for applying a continuous pressure on opposite sides of the web as the stock is being ro11ed to the desired contour.

Another object of this invention whioh contributes materially to overcoming the difficulty previously set forth, consists i:n pr'oviding a machine having means for applying a constant pressure on opposite sides of the web during the rolling operation, irrespective of variations in the thickness of the web.

A further advantageous feature of the present invention resides in the provision of a rolling machine rendering it possible to form a rolled exterior surface on the head of the T having all of the points thereof in radial pianes passing through the axis of the shoe lying in straight lines or, in other, words, provides for obtaining a rolled exterior face on the head of the T which forms a section of a truly cylindrical surface. This latter feature is desirable in that it insures utilizing the entire area of the exterior surface of the lining app-lied to the shoe as effective braking area. This feature, as well as the foregoing objects, will be made more apparent as this description proceeds, especially When considered in conneotion with the accompanying drawings, wherein:

Figure 1 is a semi-diagrammatic sectional view of a rolling machine constructed in ac cordance with this invention;

Figure 2 is a sectional view taken on the plane indicated by the line 22 of Figure 1;

Figure 3 is an enlarged sectional view of a portion of Figure 2;

Figures 4, 5, and 6 are respectively, cross sectional views taken on the lines 44, 5-5 and 6-6 respectively of Figure 1.

Referring now to the drawings, it will be noted that there is illustrated in Figure 1, a rolling machine lfl comprising a master or supporting roll Hand a plurality of forming ro11s I2 predeterminedly positioned with respect to the 5 master roll to cooperate with the latter in forming a strip of T-section stock I3 into an arcuate brake shoe with the stem or web |4 of the T extending inwardly from the head |5 thereof. Obviously, in rolling the strip of T-section stock 10 I3 to an arcuate contour with the web I4 extending inwardly there is a tendency for the web 54 to wrinkle or buckle, and in order to prevent deformation of the web during the rolling operation irrespective of any variation in 15 thickness that may occur in the web, a constant pressure is applied to the web as the strip is rolled or upset by the cooperating forming rolls.

In the present instance, hydraulic pressure is applied to the web 14 of the stock during the 20 rolling operation, through the medium of the master forming roll Il, and for accomplishing this result, the roll II is formed of two cooperi ating sections 16 and I'i spaced axially from each other a sufiicient distance to receive the 25 webi4 therebetween. As shown in Figures 1 and 2, the section I7 is keyed on a drive shaft IB and the section l6 is provided with an axially extending hub I9 keyed to a corresponding hub 20 on the section H. 11, will also be noted from 30 the above figures, that the end of the hub I9 on the section 16 projects beyond the end of the hub 20 on the section 11 for engagement with a suitable adjusting nut 2l threaded upon the drive shaft |8 and normally locked in adjusted. 35 position, by means of a look nut 22 also threaded on the drive shaft 18. The arrangement is such as to provide for varying the width of the space between the adjacent work engaging faoes of the master roll sections to accommodate web 40 portions havng different thicknesses.

It will be observed from the foregoing, that the adjusting nuts, as well as the master roll sections, rotate as a unit with the drive shaft 18 and, in the present instance, the latter is 45 driven from a suitable source of power (not shown) connected to a drive gear 23 secured to the forward end of the shaft. In this connection, it will be noted that the shaft is journaled upon opposite sides of the forming roll U in 50 suitable bearings 24fixedly secured to the machine frame.

It has previously been stated that the web I4 of the T-section stock is clamped under pressure between the sections of the master forming 55 roll, and this is accomplished by holding the section I'I of the roll under compression against the web I 4 by hydrauiic means comprising a piston '25 surrounding the drive shaft in abuisting relation to the front side of the section 17. In the specific embodiment of the invention selected herein for the purpose of illustration, the piston 25 is composed of two rings 26 and 27 secured together With a suitable seal 28 disposed therebetween. As shown in Figure 2, the piston 25 s1ides upon the drive shaft 3 and is housed within an annular recess 29 formed in the rear face of a, suitable collar 33 disposed between the front side of the section I'l of the master roll and an enlargement 3! of the shaft. In detail, the ring 26 forms the actual eiective portion of the piston, in that the same abuts the front face of the section 11 of the.orming roll III and the inner and outer surfaces respectively, slidably engage the drive shaft I8 and theannular surface of the recess 29. The ring 21 is iree from engagement With both of the aforesaid surfaces and mereiy functions to secure the annular seal 28 to the front side of the ring 26, through the medium of the screws 32. In this connection, it will be observed from Figure 2, that the seal is channel-shaped in cross section havng the inner fiange in wiping engagement With the drive shaft and having the outer diange in wiping engagement With the annular surfaceof the recess. It may also be pointed out at this time, that an annular seal 33 is provided between the rear face of the coi1ar 30 and the adjacent side of the section I'i of the master roll. This seal is located radially outwardly beyond the recess 29 in the co1iar and is of such a material as,to eiectively maintain a seal irrespectiveof limited axia1 displacement of the section I'l of the roll.

-: During the rolling operation, the piston 25 is urged into engagement With the front side of the section i of the master roll by a fiuid under pressure admitted into the annular recess 29 in rear of the piston, through the medium of a supply passage 35 extending. axially through the drive shaft 18 and. communicating With the recess through. the medium of outwardly extending passages 36. The passages 36 are arranged in pairs symmetricai With the supply passage 35, and the passages of each pair communicatewith eaoh .other at thepoint of communication of the.same With the annular recess 29, in the manner clear1y shown in Figure 2. The fluid under. high pressure is adrnitted into the suppiy passage 35 at the forward end of the shaft from a suitable source (not shown), and the rear end of the supply passage 35 is ciosed by a fitting 3! secured to the rear end of the shaft and. having a suitable relief valve 38 associated therewith to permit relieving the pressure on the section -I1 of the master roll upon compietion of the rolling operation. Thus it will be observed that the supply passage 35 extends for the full length of the drive shaft |8 and that the fluid under pressure in this passage is conducted to the annular recess 29 in advance of the piston 25, by means of the plura1ity of pairs of passages 36. With this construction, a continuous pressure may be exerted upon the section U of the master roll, during the rolling operation, of. suficient force to positively prevent buckling or wrinkling of the web I iof the stock as the same is formed to an arcuate contour.

Referring again to Figure 2, of the drawings,

15 of the stock therebetween.

it will be noted that both sections of the master roll are provided With peripheral portions 39 having flush exterior surfaces for engaging the inner surface of the head I5 of the T-section stock upon opposite sides of the web |4 thereof. As stated above, the forming roils l2 cooperate With the peripheral portions 39 of the master roll H te bend the strip of T-section stock to an arcuate contour and as shown in Figures 2, 3, 4, 5 and 6, the peripheries of the forming rolls I 2 are recessed as at 40, to receive the peripheralportions of the master roll Il With the head It will also be noted from the above figures, that the first two of the our rolls shown are provided With annulargrooves U in the work engaging surfaces thereof. These grooves are so positioned in the work engaging surfaces of the rolls as to assume the head 43 during the rolling operation, and

this is desirable since it renders it possible to eliminate the usua1 depression found to exist in the exterior surface of the rolled stock opposite the stem of the T. The existence of this depression, resulting from prior methods of rolling, caused considerable concern in the trade, since it had the tendency of reducing the effective braking area of the shoe. With the present apparatus; however, a brake shoe may be rolled having an exterior face forming a section of a truly cylindrical surface and, as a consequence the entire outer surface of the shoe may be employed as eifective braking area.

Each of the first three forming rolis I2 is fixed to a suitable shaft, which in turn is journaled in any suitable manner in the frame of the machine and is driven at a predetermined speed from the drive shaft i8 through the medium of suitable gearing. In the present instance, the gearing comprises a gear 4'| fixed to the drive shaft l8 and meshing With a gear 48 fixed to the shaft 49 upon which the first forming roll of the series 12 is secured. The aforesaid gearing also includes a gear 50 secured to the hub portion I.9 of the forming roll section 16 and meshing With gears 5! and 52 (shown in Figure 1 by the dot and dash 1ines) and respectively secured to the shafts 53 and 54,

upon which the second and .third forming ro11s of the series |2 are secured. The fourth forming roll of the series I 2 is shown in Figure 6 as being formed integral With a shaft journalled in the machine frame by suitable hall bearings supported in a manner (not shown) to permit yieldably urging the shaft toward the master roll II.

Thus from the foregoing,zit will be observed that I have provided a relatively simple rolling machine for. forming brake shoes of T-section stock.embodying eiective means for preventing the web of the stock from buckling or wrinkling during the rolling operation. It will also be apparent that I have provided a rolling machine .having means renderingzit, possible.to providea brake shoe having a rolled exterior face forming a section of a tru1y cylindrical surface.

What I claim as my nvention is:

1. In a machine for forming a metal section with a rolled surface having all of the points thereof in transverse planes lying in straight 1ines, a member engageable with the opposite surface of the stock to support the same, a forming roll predeterminedly arranged with respect to said member for engagement with the rolled surface aforesaid of the stock and having an annular groove in the periphery thereof for forming a head on said 1atter surface, and. additiona1 rolls for gradually ironing out the head.

2. In a machine for forming a meta1 section with a. rolled surface having all of the points thereof in transverse planes lying in straight lines, a member engageable with the opposite surface of the stock to support the same, and a plurality of forming rolls predeterminedly 10- cated with respect to the member to successively engage the first named surface of the stock, one of the rolls having an annular recess in the periphery thereof to form a bead on the first mentioned surface of the stock and another of the succeeding rolls having an annular recess of 1ess depth than the recess aforesaid to reduce the size of the head.

3. In a machine for forming a metal section with a rolled surface having all of the points thereof in transverse planes lying in straight lines, a member engageable with the opposite surface of the stock to support the same, a plurality of forming rolls predeterminedly located with respect to the member to successively engage the first named surface of the stock, one of the rolls having an annular recess in the periphery thereof to form a bead on the first mentioned surface of the stock and another of the succeeding rolls having an annular recess of 1ess depth than the recess aforesaid to reduce the size of the head, and. means for subsequently completely ironing out the head.

4. In a machine for forming from T-section strip stock an arcuate member provided with a rolled exterior surface on the head of the T having all of the points thereof in radial planes passing through the center of the arcuate section 1ying in straight lines, a master roll having sections disposed upon opposite sides of the stem of the T and having peripheral portions engaging the undersdes of the head of the T, and a plurality of forming rolls predeterminedly positioned with respect to the master roll to successively engage the exterior surface of the head of the T, one of the forming rolls having anannular recess in the periphery thereof to form a head on said exterior surface and another of the forming rolls having an annular recess in the periphery thereof of 1ess depth than the annular recess aforesaid to reduce the size of the head.

5. In a machine for forming from T-section strip stock au arcuate member provided with a rolled exterior surface on the head of the T having all of the points thereof in radial planes passing through the center of the arcuate section lying in straight lines, a master roll having sections disposed upon opposite sides of the stem of the T and. having peripheral portions engaging the undersides of the head of the T, a plurality of forming rolls predetermnedly positioned with respect to the master roll to successively engage the exterior surface of the head of the T, one of the forming rolls having an annular recess in the periphery thereof to form a head on said exterior surface and. another of the forming rolls having an annular recess in the periphery thereof of 1ess depth than the annular recess aforesaid to reduce the size of the head, means for subsequently ironing out the head, and means for relatively moving the master roll sections toward. each other to clamp the stem of the stock during the rolling operation.

6. In a rolling machine, a master roll, a plurality of rolls spaced from each other circumferentially of the master roll and 1ocated beyond the periphery of said master roll to cooperate with the 1atter in forming a path of travel for a strip of stock, the roll at the entrant end of the path of travel having an annular groove in the periphery thereof to form a head on the stock and the succeeding rolls cooperating with the master roll to gradually iron out the head.

'7. In a rolling machine, a formng roll having the peripheral surface engageable with one surface of a strip of stock and having an annular groove in the periphery thereof between opposite ends of the same for forming a bead on the strip of stock between the opposite side edges thereof, and means positioned beyond said roll and engageable with the surface aforesaid of the stock to iron out said head and provide a flush surface on the stock having all of the points thereof in transverse planes lying in straight lines.

8. In a rolling machine, a plurality of rolls spaced from each other along the path of travel of a strip of stock to be rolled and having periphera1 portions engageable with one surface of the stock, the roll at the entrant end of the machine having an annular groove in the periphery thereof between opposite ends of the same to form a head on the surface aforesaid of the stock between the side edges of the latter, means positioned beyond said. roll in the direction of travel of the stock for gradually reducing the size of said head, and means beyond the last named means for ironing out the head to form a flush rolled surface on the stock.

CHARLES W. SINCLAIR.

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