1、i t c 0 o UDC 681.945 DEUTSCHE NORMEN January 1973 I EN c .- E L C .- c - 2 3 2 x m Knurls 82 I I Rndel Dimensions in mm Denomination and representation Knurl with grooves parallel to axia Detail T A Section A-A -I drkpiece 4 A Section B-6 Left-hand hurl Workpiece Manufacturing methods using hurling
2、 rolls according to DIN 403 Knurl RAA Workpie I Knurling roll AA Knur? RAA Knur? RAA lorkpie Workpiec I Knurling roll ewivelled 30 Knurling roll BL swivelled 30, Workpie Knurling rll BR Knurl this dimension is a function of the design. 2.4. Initial diameter d2 The initial diameter d of the workpiece
3、 prior to hurling muet be smaller than the nominal diameter dl , because tie initial diameter undergoes enlargement through displacement of the material during the hurling operation. The initial diameter d2 for hurle with profile angle a = 90 can be calculated from the for- mulae in the Table below,
4、 depending on the type of knurl and the siae of pitch. The factors in the fonuulae, however, do not take into account the rounding of the grooves resulting from the hurling operation or the specific properties of the materiale to be knurled. - Type of knurl I Initial diameter I d2- I RKV Cross-knurl
5、, points indented I dl -0.33 t I Page 4 DIB 82 References to further etandards DIB 403 hurling rolls DIB 8583 Sheet 5 Production method compression foming; inipreeaing, classification, defini- tions Explanations Compared with the January 1940 issue of DIN 82, the standard denomination “knurl“ has be
6、en adopted for all types, since the previous denominations “diamond knurling“ and “negative diamond knurlng“ vere not used conaiatently, and hence difficultiea arose in the choice of toola. Some type8 of knurl have been given briefer denominations, auch ea left-hand hurl , right-hand knurl, left-han
7、d/right-hand burl. The type letter symbols assigned to the various types provido both for better differentiation and also yield a code deaienation for use in electronic data processing. The letter R differentiates the burla Zrom the hurling rolle (aee DIN 403). the second letter (A, E, (i and K) des
8、ignates the basic type. vhilet the third letter (A - parallel to axia, L - left-hand, E - right-hand, E - raised, Y - indented) marks the direction and form of the groovea. The helix cingle of Types BB, BL. GE and QV is fixed at standard value of 30. The profile an&e is nomallya = 90, be made. This
9、special case must be stated in the designation. The pitch t - 2 m has been discontinued becauBe it is scarcely uaed in practice. Similarly, no attempt haa been made to correlate pitch vith uorkpiece diameter, since recommendations made earlier have not proved suitable in a11 fields of application an
10、d hence thsir adoption in actual practice has been lim- ited. Formulae for calculating the initial diameter of the workpiece as a function of the type of knurl and of the outside diameter of the finished hurl, which counts as the nominal diameter, are given. The re- sults obtained are only reference
11、 values. however, since the specific properties of the materials hare not been taken into account. To facilitate the ChOOBing of hurling rolle aCCOrdin& to DIN 403, the manufacturing methods suitable for each type of burl are indicated. but, If necessary, knurls with a profile a = 10.50 - giving a shallouer depth - can
