GOST 2330-76

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  ГОСТ 2330-76

GOST 2330−76 Dies-blanks of sintered hard alloys for drawing tubes. Shapes and sizes. Specifications (with Amendments No. 1, 2)

GOST 2330−76*

Group 56

STATE STANDARD OF THE USSR

DIES-BLANKS OF SINTERED HARD ALLOYS FOR DRAWING TUBES

Shapes and sizes. Specifications

Die blanks of sintered hardmetals for drawing round tubes. The Shape and dimension. Specifications

OKP 19 6520

Date of introduction 1978−01−01

The decision of the State Committee of standards of Ministerial Council of the USSR of February 5, 1976 N 343 the deadline for the introduction is set with 01.01.78

Proven in 1986 by the Decree of Gosstandart of the USSR from 24.06.87 N 2343 validity extended until 01.01.93**
_______________________________
** Limit of validity based on a Protocol of the Interstate Council for standardization, Metrology and certification (I & C N 2, 1993). — Note the manufacturer’s database.

REPLACE GOST 2330−66

* REPRINT (July 1988) with Amendments No. 1, 2, approved in August 1982, June 1987 (IUS 12−82, 10−87)

1. SHAPES AND SIZES

1.1. The shape and size of dies-blanks shall be as specified in the drawing and in the table.1.

Note. According to customer requirements can be manufactured in portage-blanks with the channels of the radial profile, the size , , take at the table.1, and the remaining dimensions are set by agreement between the consumer and the manufacturer.

Table 1

Dimensions in mm

Example of symbolic designation of portage-blanks of alloy VK8 with a size of 10 mm, 35 mm:

Portage-processing 1980−0389 VK8 GOST 2330−76

(Changed edition, Rev. N 1, 2).

1.2. Symbol portage-blanks when ordering with the all-Union classifier of products (OKP). The complete code of OKP portage-blanks consists of 18 digits: the first six digits denote the grade, the following four sign — 3402 — a form of drag, the last eight characters of code size (denoted in the table.1).

Example of designation when ordering portage-blanks of hard alloy VK6 with brand size: 10,0 mm; 35,0 mm; 35,0 mm; 2.2 mm; 3 mm; 4.0 mm; 1,0:

19 6524

3402 198

0−0381 GOST 2330−76

(Added, Rev. N 2).

2. TECHNICAL REQUIREMENTS

2.1. The die-workpiece must be manufactured from solid sintered alloys VK6, VK8, ВК10, ВК15 according to GOST 3882−74. The density of hard alloy for portage-blanks 1980−04341980−0564 must be within:

VK6 — 14,815,2 g/cm,

VK8 is 14.715.1 g/cm,

ВК10 to 14.414.9 g/cm,

ВК15 — 13,914,6 g/s

m.

2.2. Ovality and outer work diameters may not exceed half of the dimension tolerance.

2.3. In places of conjugation of elements of the working channel portage-blanks are allowed a fillet radius of no more than 0.5 mm or burrs with a size of 0.5 mm.

(Changed edition, Rev. N 2).

2.4. In places of transition of the output cone on the end of the portage-blanks allowed the fillet radius of 1 mm.

2.5. Of pitting on the working surfaces of dies-blanks with an outer diameter of 70 mm are not allowed.

2.6. Depth of pitting on working surfaces should not exceed 1 mm for portage-blanks with an outer diameter of 30 mm and 2 mm for the portage-blanks with an outer diameter up to 70 mm.

2.7. For portage-blanks with an outer diameter of over 70 mm permitted:

a) burrs on edges up to 1.5 mm;

b) traces of porosity of graphite moulds in the form of roughness;

C) the pitting on the working surfaces of dies-blanks to a depth of not more than half of the tolerance for the size without limitation of length;

g) chips and dings on the outside surfaces to a depth of 1.2 mm.

d) chipped at the edges to a depth of 1.8 mm, extending on end and cylindrical surfaces at a distance of not more than 2.5 mm from the edge;

e) at the transition cone 60° into a cylindrical belt is allowed ledge width up to 1.5 mm;

g) nonparallel ends portage-blanks within half of the tolerance on size.

2.8. The die-blank with outer diameter more than 70 mm can be manufactured without chamfering the outside diameter.

2.9. The macrostructure in the break portage-blanks should be uniform. Shell, delamination, and foreign inclusions are not allowed.

2.10. The die-workpiece needs to be cleaned from korraks and graphite.

2.11. Unspecified limit deviations of dimensions shall be field tolerance:

for holes — H17, for shaft — h17, for others , for the angles — , — GOST 8908−81;

for radii of curves, bevels and elements that are not related to holes and shafts, tolerance class «medium».

(Added, Rev. N 1).

3. ACCEPTANCE RULES

3.1. To verify compliance with portage-blanks the requirements of this standard and GOST 3882−74 conduct acceptance tests.

(Changed edition, Rev. N 2).

3.2. Test portage-blanks is carried out in the following quantities:

a) the die-workpiece outer diameter up to 70 mm are parties;

b) with an outer diameter of 70 mm show each preset.

3.3. The party should consist of dies-blanks of the same brand of alloy made from a mixture of one cooking.

3.4. To determine the limits of bending strength and hardness portage-blanks with an outer diameter of 70 mm present 20 pieces specially made cold pressed specimens 5х5х25 mm. Specimens should be manufactured from the same batch, and workpiece.

3.5. To check the density, hardness, macrostructure selected number of samples specified in the table.2.

Table 2

The results of selective inspections apply to the entire party.

(Changed edition, Rev. N 2).

3.6. Sampling for determination of the linear dimensions is 5% of the party, but not less than 3 pieces.

If unsatisfactory results in the determination of the linear dimensions of the repeat tests are carried out at twice the sample taken from the same batch. The results of repeated tests spread to the entire party.

3.7. The General rules of Public acceptance and testing — according to GOST 26964−86.

3.6; 3.7 (Introduced later, Rev. N 2).

4. TEST METHODS AND CONTROL

4.1. Appearance portage-blanks is checked by inspection without the use of magnifying devices.

4.2. The dimensions of products test and measuring instrument or device, ensuring the necessary measurement accuracy.

4.3. The depth of fractures and the size of the fillet is determined by the optical instrument with a scale interval of 0.1 mm.

4.4. Density portage-blanks should be determined by hydrostatic weighing with an accuracy of up to 0.05 g/cmat the technical scales up to 20 kg and medical scales accurate to 0.1 g/cm.

4.5. Determination of the Rockwell hardness is carried out according to GOST 20017−74.

4.6. Determination of ultimate strength in lateral bending is carried out according to GOST 20019−74.

4.7. The macrostructure of the products in the bend test at 20−30 x magnification.

5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. Marking, packaging, transportation and storage — by GOST 19106−73.