US2283579A - Apparatus for planing coated strip - Google Patents

Description

May 19, 1942. L. SANDLER 2,283,579

"APPARATUS FOR PLANING COATED STRIP Filed Sept. 19, 1939 2.Sheets-Sheet l INVENTOR .lloul'sSandZer y 1942- 1.. SANDLER APPARATUS FOR PLANING COATED STRIP Filed Sept. 19, 1939 2 Sheets-Sheet? H mm INVENTOR Louis Sandler Patented May 19, 1942 APPARATUS FOR PLANHN'G COATED STRIP Louis Sandler, New Castle, Pa., assignor to Johnson Bronze Company, New Castle, Pa., a corporation of Pennsylvania 7 Application September 19, 1939; Serial No. 295,594

, 6 Claims.

This invention relates to apparatus for progressively finishing an elongated work-piece such as a length of strip and, in particular, to the planing of a coating of bearing metal bonded to a strip of backing metal, e. g., steel.

It has been proposed heretofore to machine the surface of a layer of bearing metal bonded to a backing strip by passing the coated strip under a rotary cutter. It has been found; however, that because of the spacing of the teeth on the cutter, it is necessary to move the strip under the cutter at a relatively low speed in order to secure the desired smooth finish. Even when operated at a low speed, such apparatus does not produce as high a degree of smoothness on the finished surface as is desired. In addition, the milling cutter produces a multitude of small chips and'considerable oxidation thereof results because of the heat generated by the cutting operation and the large surface exposed to the atmosphere.

I have invented a novel apparatus which over comes the aforementioned limitation and makes it possible to finish the surface of a coating of bearing metal on a backing strip at high speed and, at the same time, to produce asmooth suring tool is also mounted in the block and is ad-- justable toward and from the supporting member.

Thus when strip is drawn through the slot and the planing tool advanced into engagement with the layer of bearing metal, the strip is supported by the bearing roll and the surface of the layer of bearing metal is removed by the planing tool across the entire width of the strip, leaving a finished surface of a high degree of smoothness. The chips removed are of large size and may be returned to the coating bath for remelting.

device of known construction indicated generally at II. The device is preferably provided with burners I2 for maintaining a bath of bearing 22 is disposed in the bore 2I.

metal such as babbitt or the like in molten condi- I tion for flowing onto the upper surface of the strip in a coating layer of the desired thickness. Since. apparatus for coating backing strip with a layer of bearing metal is already well-known, it is unnecessary to describe the device I I in greater detail.

A water-spray nozzle I3 is preferably located at the exit end of the device II and is so ar ranged as to discharge a spray or jet'onto the coatedstrip indicated generallyat I4, to chill I Referring now to Figs. 2, 3 and 4, the surfacing device I6 comprises a block or housing I8 adapted to be securely held in any convenient manner on a suitable support (not shown). The block I8 has a slot I9 extending from the front to the back thereof. The block also has a recess or window 20 therein which is of a Width somewhat less than the block. erably about the same as that of the recess 20.

A transverse bore 2| extending through the block I8 intersects the slot I9. A rounded bearing or supporting member in the form of a roll The roll is held in place by screws 23 which enter annular grooves 24 formed near the ends of the roll. The screws 23 engage the roll loosely to permit rotation'of the latter as desired and one end of the roll is flattened as at 25 to permit it to'be turned by a suitable Wrench. I

A planing tool 26 is adjustably positioned in the recess 20 and extends substantially the full width thereof. It is provided with an insert 21 relative to the roll 22 by screws 36 turning freely in holes in the portion of the block I8 overhanging the recess 20 and threaded in tapped holes in the upper edge of the tool. By turning the screws 30, the tool 26 may be raised or lowered The width of the slot I9 is prefafter loosening the screws 28. When the tool has been adjusted, the screws 28 may be tightened to hold the tool firmly in the block. Lateral clamping screws 31 are threaded through the end of the block and engage an end of the tool to clamp it firmly against the other end of the block when properly positioned therein.

The setting of the tool 26 may be appropriately selected by hold-down screws 32 threaded through the portion of the block [8 overhanging the recess 20 and engaging the upper edge of the tool 26. The screws 32 have graduated discs 33 thereon which cooperate with index fingers 34 extending upwardly from the block IS. The tool may be adjusted to any desired extent, either upwardly or downwardly, by releasing the screws 30' and 3| and then turning the screws 32 to the desired extent, as indicated by the graduations on the discs 33 and the index fingers 34. When the screws 32 have been properly set, the screws 30 are tightened up and finally the screws 3|. As will be apparent from Figs. 1 and 4, the strip I4 is drawn through the slot I9 and the tool 26 lowered until the cutting edge of the insert 21 engages the layer of bearing metal to the desired depth. The backing strip is supported on the roll 22 and as the composite strip is pulled through the device i6, the tool 26 takes a cutoff thesurface of the layer of bearing metal across the entire width of the strip, leaving a smooth, highly finished surface on the bearing metal layer. The strip may be pulled through the surface of the device It as rapidly as it can be satisfactorily coated by the mechanism l I. The chips of hearing metal removed by the planing tool are of considerable length and extend in one piece across the full width of the strip. They may thus be easily collected for return to the coating bath H for remelting.

The invention is characterized by numerous advantages which will be readily apparent. The surfacing device It is simple and relatively inexpensive in construction. The cutting edge of the planing tool may be ground accurately so as to provide a flat surface across the width of the finished strip. The entire width of the strip, furthermore, is surfaced simultaneously. Since the-insert on which the cutting edge is formed is composed of a hard cutting alloy, it may be used for a considerable time without necessity for re-grinding, because the bearing metal is relatively soft and easy to cut. The supporting roll 22 may be rotated intermittently to distribute the wear uniformly therearound and maintain the strip in proper position relative to the cutting edge of the tool 26. p i

A further important advantage is that, as previously mentioned, the chips produced by the planing tool are large and are free from oxidation. It is thus feasible to return them directly to the coating bath for remelting. This eliminates the remelting loss of 8% or 9% experienced with the chips produced by the apparatus previously used which, as stated, are oxidized and- Although I have illustrated and described a preferred embodiment of the invention, it will be recognized that changes in the construction disclosed may be made without departing from the spirit of the invention or the scope of the appended claims.

I claim:

1. A device for finishing the surface of a layer of bearing metal bonded to a backing strip, comprising a tool-holding block having a transverse slot through which the strip may be drawn, a rounded abutment extending across the block and into one side of .the slot, and a planing tool adjustably mounted on the block for movement into the other side of said slot with its cutting edge in substantial alinement with said abutment.

2. A surfacing device comprising a housing having an opening adapted to admit strip moving longitudinally therethrough, a rounded bearing member extending partly into said opening from one side thereof, and a planing tool mounted in said. housing for movement so that its cutting edge projects into said open ng from the other side and in substantial alinement with said memher. I

3. A surfacing device comprising a housing having a transverse slot therein through which strip may be drawn, a bearing roll rotatably seated in said housing and projecting into said slot from one side thereof, and aplaning tool having an edge extending into the other side of said slot in substantial alinement with said roll, said tool being adjustable toward and from said roll.

4. A surfacing device comprising a block having a slot therethrough from front to back through which strip may be drawn, a transverse boretherethrough intersecting said slot, a roll positioned in said bore and projecting sidewise into said slot, a planing tool having an edge extending into said slot opposite said roll, and means for adjusting said tool toward andfrom said roll. I r

5. A surfacing device comprising a block having a slot therethrough from front to back through which strip may be drawn, a transverse bore therethroughintersecting said slot, a roll positioned in said bore and projecting sidewise above the bottom of the slot whereby strip drawn through the slot is supported on said roll, and a planing tool adjustably mounted on said block having an edge extending downwardly into said slot opposite said roll.

6. Strip-surfacing apparatus comprising a housing having an opening therethrough adapted to admit strip lengthwise, a rounded abutment positioned in said opening and adapted to support the strip progressively as it passes therethrough, and a cutting tool mounted in said housing for movement to a position adjacent said abutment such that the edge of the tool projects into said opening for engagement with the surface of a strip passing through the opening and supported on said abutment.

. LOUIS SANDLER.

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