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Spline Rolling Rack and Method for Preparing a Spine Rolling Rack

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Spline Rolling Rack and Method for Preparing a Spine Rolling Rack (19) TZZ¥ _Z T (11) EP 3 246 106 A2 (12) EUROPEAN PATENT APPLICATION (43) Date of publication: (51) Int Cl.: 22.11.2017 Bulletin 2017/47 B21H 5/02 (2006.01) B21H 3/06 (2006.01) (21) Application number: 17155302.7 (22) Date of filing: 21.05.2013 (84) Designated Contracting States: (72) Inventor: CALLESEN, Michael David AL AT BE BG CH CY CZ DE DK EE ES FI FR GB Columbia Station, Ohio 44028 (US) GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (74) Representative: Hirsch & Associés 137, rue de l’Université (30) Priority: 23.05.2012 US 201213478663 75007 Paris (FR) (62) Document number(s) of the earlier application(s) in Remarks: accordance with Art. 76 EPC: This application was filed on 08-02-2017 as a 13793260.4 / 2 855 044 divisional application to the application mentioned under INID code 62. (71) Applicant: U.S. Gear Tools, Inc. Detroit, Michigan 48205 (US) (54) SPLINE ROLLING RACK AND METHOD FOR PREPARING A SPINE ROLLING RACK (57) A spline rolling rack assembly for cold-forming load and work positions, and multiple clamping assem- external surface configurations upon a metal workpiece blies disposed within said carriage for releasably secur- is provided, having a durable carriage of the type secured ing the rack insert upon the carriage. The perishable rack upon a reciprocating slide assembly, a perishable rack insert is designed for quick and convenient replacement, insert that is removably secured upon the carriage, a lo- reducing maintenance cost and idle time for these devic- cating key disposed between the rack insert and the car- es. The single-use nature of the insert relieves the user riage for properly aligning the rack insert upon the car- from the burden of managing an inventory of like tools, riage, a locating assembly disposed upon the carriage in various states of use, in order to ensure that new tools and engageable with the rack insert for assisting in prop- are ordered in a timely manner for replacing tools that erly aligning the rack insert and the carriage between have exhausted their useful life. EP 3 246 106 A2 Printed by Jouve, 75001 PARIS (FR) 1 EP 3 246 106 A2 2 Description [0005] The nature of forming the desired power/torque transmission features, such as splines, requires critical [0001] This application is a divisional application of Eu- tolerances in the size and configuration of the feature- ropean patent application No. 13793260.4 filed on May forming surfaces, and well as in the spacing, configura- 21, 2013. 5 tion and movement of the racks so that the desired sur- face features are accurately formed in the workpiece. FIELD Thus, these tooling components require precision-craft- ed feature-forming surfaces and precision mounting ap- [0002] The present disclosure relates generally to ma- paratus, supports and fasteners within the larger ma- chines for forming external surface configurations upon 10 chines in which they are typically contained. However, metal workpieces by pressure-applied material displace- these tooling components have a limited lifespan, with ment, and is more specifically directed to spline rolling their feature-forming surfaces typically becoming worn rack assemblies, components, tooling and devices for or no longer within required tolerances after some period securing and manipulating such tooling. The present dis- of their use. closure also relates to methods for roll-forming splines 15 [0006] Accordingly, at periodic intervals it is typically on the external surfaces of axle, shaft and other pow- necessary to remove the surface-forming tooling com- er/torque transmission components of the type used in ponents for replacement or resurfacing. Such compo- vehicles, machines, commercial and industrial equip- nents can typically be resurfaced a number of times be- ment and other devices. fore they can no longer be resurfaced, and as such, must 20 then be replaced. Oftentimes, the manufacture and re- BACKGROUND surfacing of such tooling components is inefficient due to the time required to ship the components back to the [0003] This section provides background information manufacturer for resurfacing and back again to the user. related to the present disclosure which is not necessarily Also, oftentimes, removal and replacement of such tool- prior art. 25 ing components is time-consuming, burdensome and [0004] The manufacture of axle, shaft and other pow- otherwise inefficient, due to the configuration and large er/torque transmission components of the type used in size of the components, the current way in which the vehicles, machines, commercial and industrial equip- tooling components are secured in a work position, and ment and other devices often requires the formation of the positioning and aligning activities that must typically power/torque transmission features upon the external 30 take place for securing the components in a work posi- surfaces of round metal workpieces, in the form of rods, tion. Having such a machine in an idle state during re- tubes, cylinders and other shapes. One exemplary man- quiredmaintenance activities slows down overall produc- ufacturing method involves spline rolling, which typically tion rates for any such affected facility, so it is advanta- utilizes a pair of opposed, elongated, substantially par- geous for such maintenance to be made convenient, ef- allel, reciprocating dies, tools or tool members (called 35 ficient and quick. "racks")having a seriesof feature-forming surfaces,such [0007] As examples, the tooling components requiring as teeth, disposed in precision arrangements on facing repair or replacement may be secured within the interior surfaces thereof corresponding to, but not necessarily of a larger machine in a way that is inconvenient to man- matching, the desired final surface features of the work- age, such as being secured with fasteners, such as bolts piece to be prepared. Accordingly, spline rolling typically 40 and set screws, that are difficult to reach and manipulate. involves reciprocating movement of the opposed dies, In addition, the end of a spline rolling rack is typically the tools or tool members (called "racks") over the length of primary locating surface for gauging the proper mounting a rotating workpiece, in opposite directions and in over- location of the rack within the machine, which can be lapping relationship, causing the feature-forming surfac- inconvenient to measure or check for proper alignment. es to displace material upon the surface of the rotating 45 Also, the tooling components may not themselves be workpiece by applied pressure, in a cold-forming tech- manufactured in sufficient tolerances for precision work, nique. The spline rolling operation thus forms the desired or the devices or features provided for facilitating proper finished external surface features in the workpiece, typ- positioningmay not be sufficient or efficientto use. Proper ically helical or spur ridges, teeth or grooves (oralignment of the tooling components relative to each oth- "splines"), through the combination of the rotation of the 50 er must typically be ensured, which may only be provided workpiece with the linear reciprocating movement of the in limited scope by relative adjustment of certain surfaces racks. Spline rolling racks are typically constructed in sin- on the machine components when located within the ma- gle or double-piece form, with either the single piece or chine that can be difficult to reach and/or examine. The both pieces of a double-piece rack being perishable. final tolerances required in the feature-forming surfaces They are typically fastened upon suitable opposed, elon- 55 may also not be sufficient, or may be manufactured in- gated, substantially parallel, reciprocating slide assem- efficiently, such as by preparing the feature-forming sur- blies located within dedicated spline rolling machines of faces to required precision tolerances as the final step industrial grade. of the manufacturing process. 2 3 EP 3 246 106 A2 4 [0008] In addition, there is typically a substantial cost Also, the locating key may preferably be secured to said associated with the replacement or repair of the tooling carriage by a locating bolt. components involved in such surface forming operations. [0013] The spline rolling rack assembly further com- The sizes of the components can be substantial, depend- prises a locating assembly operable for being disposed ing upon the sizes of the power/torque transmission com- 5 upon the carriage in movable relation between a first po- ponents being manufactured, perhaps requiring substan- sition corresponding to a loading position of the rack in- tial powered lifting equipment for assisting in this activity. sert upon the carriage and a second position correspond- The repair or replacement of the tooling components may ing to a work position of the rack insert upon said carriage. require shipment and/or courier delivery of substantially- The locating assembly is also operable for engaging a sized and weighted components, at considerable ex-10 recess within the rack insert, wherein movement of the pense. Users of such tooling components must also man- locating assembly from the first position to the second age a float of such tools at various levels of life and, due position engages the locating assembly with the recess to the lead time required to manufacture new racks, must within the rack insert to assist in properly aligning the anticipate tools ending their life span and order new tools rack insert upon the carriage in at least one of a load
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