You are on page 1of 11 Search inside document 3 i UDC , Symbols and quantities : 1 Working range 2. Hobs for flank contred spline shafts Dieses and trance hit 30" pressure angle Form circle diameter, effective diameter. Dimensions end tolerances 22 Dimensions and oer 8.
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Symbols and quantities : 1 Working range 2. Hobs for flank contred spline shafts Dieses and trance hit 30" pressure angle Form circle diameter, effective diameter. Dimensions end tolerances 22 Dimensions and oer 8. Spe inion yp ctr. Working range eeeae 42 Types, overall sizes Price group 8 Sales No. DIN Part 16 1. In contrast with these, there are special hobs which are designed to produce specific forms of shaft profile see subclause 2.
Basic rack profiles of too! Finish-eutting Pre-cutting Reference line pani tek Basic rack profiles oimemin Peete eae tr ecg tor for subsequent for subsequent finisheurting grinding ishing ispo Figure 1. Deviations are permitted, depending on the space available for hob run-out.
Figure 2. Hob and shaft profile 2. All such hobs can be manufactured so as to generate the basic dimensions specified in DIN Dimensions and tolerances 3. Basic rack profiles of tool Finish-cutting Pre-cutting Reference line hwo apo.
Figure 3. See subclause 3. Disc and hub type cutters are suitable for spline shafts; they are only suitable for spline hubs if the number of hub teeth is at least 1,75 to 1,3 the factor decreases with increasing number of hub teeth; see table 1 times the number of teeth of the cutter. Cutters designed to give a greater splining accuracy shall be specially agreed. When cutting the hub, the negative signs of distance ag and of the hub root diameter, dra, are to be taken into account.
If, in a specific case, minimum values are required which are not obtainable when using the standard tool, it will be necessary to produce the component concerned by means of a special cutter designed for this purpose. If necessary, the hub addendum will have to be shortened accordingly, the hub designed with tooth tip chamfer, or a special pinion type cutter as used in subclause 3.
Pinion type cutter and shaft profile 3. All such cutters can be manufactured 0 a5 to generate the basic dimensions specified in DIN Page 8 DIN Part 16 Special pinion type cutters with tip chamfering flanks for externally centred shaft profiles with tooth tip chamfer and special pinion type cutters with projection at the tooth tip for internally centred shaft profiles with root clearance ar designed for specific tooth-number groups and are usable only for these.
Cutters for externally centred hub profiles are Usable for single profiles or hub tooth number groups, depending on the centring diameter tolerances. Ssnhemeal Bracketed modules shall be avoided where possible.
Working range Broaches for spline hubs as specified in this standard are single purpose tools because as form-cutting tools they will each cut only one profile in contrast with generating tools. They are used for all modules and all numbers of teeth from 6 upwards.
At the present time, the largest outside diameter is around mm. The broaches are designed to cover a range of hub length 4. Other types, e. DIN shall be taken into account regarding the design of the teeth and chip spaces.
DIN Part 16 Page 9 4. The hob teeth have corrected profile differing from the hub profile. The orm correction depends on the rise per tooth chosen to suit the task performed by the broach.
The workpiece profile can only be measured using a test ring broached by the tool. This improves the cutting conditions in the range of small involute pressure angles arising with small numbers of teeth, end simplifies the profile grinding of the broach at the tran sition from the flank to the root.
Profile shapes ditfer- ing from this design are to be specially agreed. Excep- tions comprise hubs with modules ranging from 0,5 up to and including 1, with tooth tip thicknesses smaller than 0.
In the case of these profiles, a hub tooth tip radius of 0,1 mm results, since the tooth roots of the broach teeth undergo rounding due to grinding wheel wear. The radius shall tangent the but also causes profile form deviations and varying tooth tooth flank and the hub root diameter thicknesses. Machining During the cutting operation, internal broaches for Of the outside of the hubs should therefore be carried albround cutting, which include those referred to above, Ut on the basis of the broached splining.
The standard has been editorially revised. The decisive factors in this connection were the machining allowances, q, specified in DIN and the principle that the pre-cutting tool cuts the root diameter of the finished spline and thus limits the machining allowance on the tooth flanks. Tooth form corrections of the pre-cut spline, e. Subclauses 2. Similarly, the calculation of the tool setting as a function of tooth thickness deviations and of deviations specified for other dimensions has been amended.
The required formulae have been presented in form suitable for programming. Generally, with an addendum of 0,55 : m and a tooth tip radius of 0,16 - m the broaches may reliably be expected to produce the required minimum form clearance.
DIN 5480-16:1980-10 - Draft