1、UDC 621.951.45-034.018.25 : 620.1 DEUTSCHE NORM April 1993 Technical delivery conditions for DIN 6537 and DIN 6539 solid hardmetal twist drills Requirements DIN - 6540 Part 1 Technische Lieferbedingungen fr Vollhartmetall-Spiralbohrer nach DIN 6537 und DIN 6539; Anforderungen In keeping with current
2、 practice in standards published by the International Organization for Standardization (ISO), a comma has been used throughout as the decimal markel: Dimensions in mm Contents Page Page 1 Scope and field of application 1 4.5 Relative lip height 2 2 Symbols and quantltles 1 5 Material 2 3 Designation
3、 . 1 6 Design 2 3.1 Standard designation 1 6.1 Cutting direction and lead of helix 2 3.2 Designation to be used when ordering 2 6.2 Number of cutting edges 2 6.3 Grooves 3 6.4 Surfaces 3 4 Dimensions 2 6.4.1 Surface roughness 3 4.1 Cutter diameter and back taper. 2 6.4.2 Surfacefinish 3 4.2 Parallel
4、 shank . 2 4.3 Radial run-out . . 2 4.4 Lengths 2 7 Marking . 3 . . . . . . 1 This standard specifies requirements for solid hard- metal twist drills as specified in DIN 6537 and DIN 6539. For twist drills not covered in this standard (e.g. twist drills to be produced to specified drawings), the req
5、uirements may be the subject of agreement between purchaser and supplier. Terminology and symbols used in the field of chip removal are covered in DIN 6581 and DIN 6582. Scope and field of application 2 Symbols and quantities d, cutter diameter bIan land width I, overall length iAs tolerance on lip
6、height t, tolerance on radial run-out yf side rake As permissible difference in height of major cutting edges 3 Designation 3.1 Standard designation The standard designation of solid hard metal twist drills shall give, in the following order: a) name and DIN number, followed by a b) dash; c) symbol
7、denoting the twist drill type (only for DIN 6537 twist drills); d) symbol K (with groove, oriented helically) or symbol Z (with groove, oriented centrically) (cf. subclause 6.3); e) cutter diameter, d, , in mm; f) symbol K for short series or L for long series twist drills, followed by a dash (only
8、for DIN 6537 twist drills); g) symbol L only for twist drill with left-hand cutting and left-hand helix, followed by a dash (cf. sub- clause 6.1); h) number of cutting edges (to be given only when the drill is to be supplied with three cutting edges; cf. subclause 6.2). Continued on pages 2 and 3. B
9、euth Verlag Gmbii, Berlin, has the exclusive right of sale for German Standards (DIN-Normen). DIN 6540 Part 1 Engl. Price group 6 08.95 Sales No. 0106 Page 2 DIN 6540 Part 1 Type EXAMPLE 1 : Stepped shank solid hard metal twist drill I- With groove Cutter diameter Drill DIN 6539 - 10 7T Continuous s
10、hank solid hard metal twist drill Cutter diameter EXAMPLE 2: Drill DIN 6537 A K 12 L - L - 3 3.2 Designation to be used when ordering Subject to agreement, the hardmetal application group as specified in IS0 513 may be indicated in the desig- nation, preceded by a dash, e.g.: Drill DIN 6537 - A 12 -
11、 HC - P 30 4 Dimensions 4.1 The values of cutter diameter, d, of twist drills are specified in the relevant dimension standards. Checking of the cutter diameter shall be carried out as specified in DIN 6540 Part 2. The diameter of twist drills with a cutter diameter exceeding 3mm shall normally tape
12、r from the outer corners towards the shank (effective length) by 0,02 mm to 0,3 mm per 100 mm of length (back taper). Checking of the back taper shall be carried out as specified in DIN 6540 Part 2. Cutter diameter and back taper 4.2 Parallel shank The shank dimensions shall be as specified in DIN 6
13、535, DIN 6537 and DIN 6539. The tolerance on cylindricity shall be IT4 as specified in IS0 286-1. 4.3 Radial run-out The tolerance on radial run-out, t, measured as described in DIN 6540 Part 2 (see figure I), shall be 0,02 mm. 4.4 Lengths The tolerance on the overall length shall comply with accura
14、cy grade very coarse as specified in IS0 2768-1. 4.5 Relative lip height The relative lip height, A, is the difference in height of major cutting edges normal to the drill axis, measured 49,s t A Figure 1 in mid-position between the two or three major cutting edges. The tolerance, tAs, shall be 0,03
15、 mm. Checking of A, shall be carried out as specified in DIN 6540 Part 2. 5 Material The hardmetal shall be of chip removal group P or K (as specified in IS0 513), at the manufacturers discre- tion or subject to agreement. In the latter case, the symbol for the application group shall be indicated w
16、hen ordering (cf. subclause 3.2). 6 Design 6.1 The standard cutting direction of twist drills is to the right Left-hand cutting, with a left-hand helix (L), shall be indicated in the designation (cf. subclause 3.1). Cutting direction and lead of helix 6.2 Number of cutting edges Twist drills are nor
17、mally provided with two cutting edges. Where a drill is to have three cutting edges, this shall be indicated in the designation (cf. subclause 3.1). 6.3 Grooves As a rule, twist drills are designed without grooves. Twist drills with grooves shall be supplied at the manu- facturers discretion or subj
18、ect to agreement. For order- ing purposes, grooves oriented helically shall be denoted by symbol K and those oriented centrally, by symbol Z (cf. subclause 3.1). DIN 6540 Part 1 Page 3 6.4 Surfaces 6.4.1 Surface roughness The cutting edge surfaces shall have an arithmetical mean deviation of the pro
19、file, Ra, as specified in the table below. Checking of the surface roughness shall be carried out as specified in DIN 6540 Part 2. Table: Arithmetical mean deviation of the profile, Ra On land I On parallel shank Max. arithmetical mean deviation of the profile, Ra, in pm, for a cutter diameter, in m
20、m, over 2,36 over 6,OO up to 20,o up to 6,OO 6.4.2 Surface finish The method of surface treatment (e.g. nitriding) is at the manufacturers discretion or subject to agreement. Any special finish of the drill shall be indicated by sym- bol HC in the designation (cf. subclause 3.2). 7 Marking Twist dri
21、lls shall be marked with the manufacturers or suppliers name or symbol. The marking shall not adversely affect the clamping or function of the tool. Drills with shank diameters not less than 3 mm to 6 mm shall be marked at least with the manufacturers symbol and the cutter diameter. In the case of d
22、rills with a shank diameter smaller than 3 mm, the marking shall be applied to the packaging. The complete designation as specified in clause 3 and the hardmetal tool applica- tion group shall be indicated on the smallest packing unit. Any additional marking shall be at the manufacturers discretion
23、or be subject to agreement. Standards referred to DIN 6535 DIN 6537 DIN 6539 DIN 6540 Part 2 DIN 6581 DIN 6582 IS0 51 3 : 1 991 IS0 286- 1 : 1988 IS0 2768- 1 : 1989 Parallel shanks for hardmetal twist drills and milling cutters; dimensions Stepped parallel shank solid hardmetal twist drills; dimensi
24、ons Continuous parallel shank solid hardmetal twist drills; dimensions Technical delivery conditions for solid hardmetal twist drills as specified in DIN 6537 and DIN 6539; checking of dimensions Concepts associated with chip removal; reference systems and angles on the cutting of tools Concepts ass
25、ociated with chip removal; additional concepts for tool, wedge and cutting edge IS0 system of limits and fits; bases of tolerances, deviations and fits Application of hard cutting materials for machining by chip removal; designation of the main groups of chip removal and groups of application Genera
26、l tolerances; tolerances for linear and angular dimensions without individual tolerance indi- cations Explanatory notes The design of tool angles is dependent on the intended use of the tool and on the manufacturing method used. Since both manufacturers and users were aware of the difficulties invol
27、ved in specifying tool angles, such specifica- tions were not made. For this reason, it is recommended that full information on the intended use of solid hardmetal twist drills be provided when ordering such drills. For maintenance purposes, the drill manufacturer should supply details on regrinding. International Patent Classification B 23 B 051 /O0 B 27 G 015/00 B 28 D O01 /14 GO1 B021/30
