1、DEUTSCHE NORM June 1998 Technical delivery conditions for high-speed steel twist drills Part 2: Inspection DIN - 141 4-2 ICs 25.1 00.30 Descriptors: Tools, twist drills, high-speed steel, inspection methods. This standard, together with DIN 1414-1, June 1998 supersedes DIN 1414, October 1977. Techni
2、sche Lieferbedingungen fr Spiralbohrer aus Schnellarbeitsstahl - Teil 2: Prfung In keeping with current practice in standards published by the International Organization for Standardization (/SO), a comma has been used throughout as the decimal marker. Contents Page Page Foreword . . 1 3.4 Land widt
3、h 2 3.5 Relative lip 2 Normative references , , , , , , , , , , , , , , , , , 2 3.6 Flute spaci 3.7 Helixangle 4 3 Checking dimensions 3.1 Drill diameter 2 3.9 Side clearan . 5 . 2 4 Hardness 6 3.2 Radial runout . . 3.8 Point angle . . 5 . 3.3 Web . 3 5 surface roughness . 6 3.3.1 Web thickness . 3
4、3.3.2 Web symmetry . 3 Other relevant standards . 7 Foreword This standard has been prepared by Technical Committee Spiralbohrer aus Schnellarbeitsstahl of the Normenausschu Werkzeuge und Spannzeuge (Tools and Clamping Devices Standards Committee). Amendments This standard differs from the October 1
5、977 edition as follows: a) The standard now consists of two Parts, one dealing with requirements (Part 1) and the other one with inspection (Part 2). b) The standard introduces requirements for web symmetry, side clearance, surface roughness and surface treatment. c) The inspection methods have been
6、 brought up to date. Previous editions DIN 1414: 1955-04, 1958-06, 1966-12, 1971-08, 1977-10. Continued on pages 2 to 7. Translation by DI N-Sprachendienst. In case of doubt, the German-language original should be consulted as the authoritative text I I Q No pari of this translation may be reproduce
7、d without the prior permission of Ref. No. DIN 1414-2 : 1998-06 Beuth Verlag GmbH, D-10772 Berlin, hac the exclusive right of sale for German Standards (DIN-Normen). DIN Deutsches Institut fur Normung e. V., Berlin. English price group 08 Sales No. 0108 11.99 Page 2 DIN 1414-2 : 1998-06 Dimensions i
8、n mm 1 Scope This standard specifies methods of inspecting two-flute twist drills made of high-speed steel. It is not appli- cable to roll-forged drills. See DIN 1414-1 for requirements. 2 Normative references This standard incorporates, by dated or undated reference, provisions from other publicati
9、ons. These norma- tive references are cited at the appropriate places in the text, and titles of the publications are listed below. For dated references, subsequent amendments to or revisions of any of these publications apply to this standard only when incorporated in it by amendment or revision. F
10、or undated references, the latest edition of the publication referred to applies. DIN 228-1 Morse tapers and metric tapers - Taper shanks DIN 1414-1 Technical delivery conditions for high-speed steel twist drills - Requirements DIN 4768 Determination of surface roughness parameters Ra, RZ, and R, us
11、ing electric stylus instru- ments - Concepts and measuring conditions DIN 6581 Concepts associated with chip removal - Reference systems and angles on the cutting portion of tools DIN 6582 Concepts associated with chip removal -Additional concepts for tool, wedge and cutting edge 3 Checking dimensio
12、ns 3.1 Drill diameter The drill diameter shall be measured across the lands at the outer corners of the drill, immediately adjacent to the point (see figure 1) by using a micrometer, a ring gauge or an indicator. Figure 1: Point of drill diameter measurement 3.1.1 Back taper The back taper shall be
13、measured from the outer corners towards the shank of the drill using a micrometer or an indicator. 3.2 Radial runout The radial runout shall be measured across the lands at the outer corners of the drill using a suitable vee block with stop and dial gauge, as shown in figures 2 and 3, suitable for b
14、oth parallel and Morse taper shanks, or an optical instrument. Place the drill on the vee block so that it is in contact with the stop, with the land facing upwards and touching the gauging pin. Set the gauge to zero, rotate the drill through 180“ and take the reading. Figure 2: Measurement of radia
15、l runout of parallel shank twist drills Page 3 DIN 1414-2 : 1998-06 Figure 3: Measurement of radial runout of Morse taper shank twist drills 3.3 Web 3.3.1 Web thickness The web thickness shall be measured at the drill point (see figure 4) using a calliper, a stylus instrument or a micrometer. Figure
16、 4: Web thickness 3.3.2 Web symmetry The web symmetry shall be measured using a vee block with stop and a dial gauge. Place the drill on the vee block with the web at the drill point or behind any thinning of the web touching the gauging pin (see figure 5). Set the gauge to zero, rotate the drill th
17、rough 180“ and take the reading. Figure 5: Measurement of web symmetry 3.4 Land width The land width shall be measured at right angles to the leading edge of the land across a land (see figure 6), using a calliper or an optical instrument. Figure 6: Land width Page 4 DIN 1414-2 : 1998-06 3.5 Relativ
18、e lip height The relative lip height shall be measured close to the centre of the major cutting edge, excluding the area of web thinning, using a vee block with stop, and a dial gauge located vertically to the datum plane. Figure 7: Vee block for measuring relative lip height Place the drill in the
19、vee block so that it is in contact with the stop and with one major cutting edge touching the gauging pin (see figure 8, position 1). Set the gauge to zero, rotate the drill through 180“ and take the reading at the other cutting edge (see figure 8, position 2). The value indicated shall be taken as
20、the relative lip height. Figure 8: Point of relative lip height measurement 3.6 Flute spacing The flute spacing shall be measured on the face of the drill, as close as possible to the outer corners, using a vee block and a dial gauge. Place the drill on the vee block so that one major cutting edge t
21、ouches the gauging pin, as shown in figure 9. Set the gauge to zero and rotate the drill through 180“ so that the other cutting edge is in contact with the stop, and take the reading, which is to be taken as the flute spacing. I Figure 9: Measurement of flute spacing 3.7 Helix angle The helix angle,
22、 yf (see figure 12), shall be measured at both minor cutting edges using a toolmakers micro- scope, whose reticle is to be aligned with the minor cutting edge, as shown in figure 1 O, and the reading of the angle taken. Page 5 DIN 1414-2 : 1998-06 90 Figure 10: Measurement of helix angle 3.8 Point a
23、ngle The point angle shall be measured for the major cutting edges using a vee block with stop and a toolmakers microscope. Place the drill in a vee block so that it is in contact with the stop. Turn the drill until the major cutting edge is facing up, towards the microscope, and then fix the drill
24、in this position. When viewed through the microscope, the cutting edge will appear as a straight line parallel to the datum plane. Read off the point angle, as shown in figure 11. NOTE: Since the major cutting edges do not in fact lie in the datum plane, the correct position of the drill can only be
25、 reached by slightly rotating it. Figure 11: Measurement of point angle 3.9 Side clearance The side clearance shall be measured at the edge of one of the lands using a vee block with stop and a toolmakers microscope. Place the drill in the vee block so that it is in contact with the stop. Rotate the
26、 drill until its axis lies approximately at the land edge (the major cutting edge will appear as a straight line parallel to the datum plane). Fix the drill in this position. Adjust the reticle so that it is over the land edge and take the reading. Rotate the drill through 180“ and repeat this proce
27、dure (see figure 12). Page 6 DIN 1414-2 : 1998-06 Drill diameter, in mm, when measuring in the flute (a) at the point (b) across the land (c) Over up to Over up to Over up to 2,65 6,OO 2,36 6,OO - - 6,OO 15,OO 6,OO 15,OO - 2,36 15,OO 106,OO 15,OO 106,OO 2,36 106,OO Figure 12: Measurement of side cle
28、arance Evaluation length, in mm 0,48 0,08 1,50 0,25 4,80 0,80 cut-off *), in mm 4 Hardness The hardness of the drill shall be measured on the land adjacent to the outer corners of the major cutting edge or, for Morse taper shank drills, on the outside cylinder of the tang. A suitable hardness testin
29、g instrument shall be used, choosing the test load as a function of the drill diameter. NOTE: The hardness of the shank of a finished twist drill should not be tested in order not to damage the shank surface. 5 Surface roughness The arithmetical mean deviation of the profile, Ra, shall be measured u
30、sing a suitable stylus instrument, at the following points: a) in the flute, at right angles to the helix angle, yf, at a distance equal to the drill diameter from the point of the drill (measurement l), and at half the flute length (measurement 2); b) at the point, across the grinding direction, cl
31、ose to the major cutting edges; c) across the land, between the flute runout and the end of the relief; d) on the Morse taper, close to plane A as in DIN 228-1. When measuring in the flute (item a), the length of measurement (evalution length )shall extend to the minor cutting edge. Measurements acr
32、oss the land (item c) shall be made along the drill axis in either direction. Measurements on the Morse taper (item d) shall also be made along the drill axis. See tables 1 and 2 for the ratio of evaluation length to drill diameter. Page 7 DIN 1414-2 : 1998-06 Evaluation length in mm Morse taper siz
33、e, in mm Table 2 cut-off, in mm MKl toMK6 4,80 0,80 Other relevant standards DIN 338 DIN 339 DIN 340 DIN 341 DIN 345 DIN 346 DIN 1869 DIN 1870 DIN 1897 DIN 1899 DIN 6580 Parallel shank twist drills, jobber series Parallel shank twist drills for use in jig bushes Parallel shank twist drills, long ser
34、ies Morse taper shank twist drills, long series, for use in jig bushes Morse taper shank twist drills Morse taper shank twist drills with oversize shank Extra long twist drills with parallel shanks Extra long series twist drills with Morse taper shanks Parallel shank twist drills, stub series Small drills Concepts associated with chip removal - Movements and geometry of the chip removal process
