ISO 6987:2012 pdf download – lndexable hard material inserts with rounded corners, with partly cylindrical fixing hole – Dimensions
ISO 6987:2012 pdf download – lndexable hard material inserts with rounded corners, with partly cylindrical fixing hole – Dimensions.
ISO 6987 specifies the dimensions of hard material inserts With rounded corners and with a partly cylindrical hing hole. These Inserts are primarily intended to be mounted on turning and boring tools using a countersunk head screw or any other fixing element, such as a pin lock,
2 Normative references
The following referenced documents are indispensable for the application of this document, For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 513. Classification and application of hard cutting malenals for metal removal with defined cutting edges
— Designation of the main groups and groups of application
ISO 1832, lndezabie inserts for cutting tools — Designation
3 Types of inserts
The types of indexable hard material insert specified in this International Standard are the following:
— TC: triangular inserts, with 7° normal clearance:
— TP: triangular inserts, with 11° normal clearance;
— SC: square inserts, with 7° normal clearance;
— SP square inserts, with 11° normal clearance;
— CC: rhombic inserts, with 7° normal clearance and 80’ included angle;
— CP: rhombic inserts, with 11’ normal clearance and 80’ Included angle;
— DC: rhombic inserts, with 7’ normal clearance and 55’ included angle;
— VB: rhombic inserts, with 5° normal clearance and 35° included angle;
— VC: rhombic inserts, with 7’ normal clearance and 35’ included angle;
— RC: round inserts, with 70 normal clearance;
— RP: round inserts, with 110 normal clearance:
— WC: hexagonal (trigon) inserts, wIth 7° normal clearance and 80’ included angle.
Inserts dealt with in this International Standard are standardized with chip breakers on the face (designated by the letter T) and without chip breakers (designated by the letter W).
Neither the shape nor the dimensions of chip breakers are standardized. Thus, if necessary, special features shall be explained with a diagram or additional specifications
Tables C.1 to C.4 give the range of sizes for these inserts.
4.3 Fixing hole
In order to guarantee interchangeability when mounting the insert by a countersunk head screw having a head taper angle between 40’ and 60’, the form of the hole is partly cylindrical and its crnensions are related to the diameter of the inscribed cirde of the insert. Figure 2 and Table I give the elements of definition of the fixing hole.
The position of point P Is given by diameter d2 (see Table 1), the distance,, measured from the cutting edge at the corner and dimension r, measured from the upper face.
The ranges of dimensions t and ( are as follows:
0.05 d1 s 0,3 d1
These dimensions take into account three cases: indexable inserts with upper faces below the cutting edges (see Figure 2 efl: with upper faces on the same level as the cutting edges (see Figure 2 b)J: with upper faces above the cutting edges [see FIgure 2 C)).
The dimensions of , and r shall be satisfied in all tlvee cases.
The diameter, di. of the cylindrical part of the hole is given in Table 1.
The part of the profile between di and P is left to the manufacturei’s discretion, but shall satisfy the following requirements:
— the use of screws with heed taper angle, /J. of between 40’ and 60’ shall be possible;
— the angle of the tangent theoretical taper at point P has the value of9,? 65’;
— the distance between the contact line with a screw having a 40’ head taper angle and the contact line with a screw having a 60’ head taper angle shall be as small as possible
The part of the profile above point P is left to the rrianufacturers discretion.