Countersinks with a cylindrical shank GOST 14953 80. Countersinks conical. Areas of application for countersinks

Countersinks and countersinks belong to the category of metal-cutting tools specifically designed for processing holes various configurations. With the help of such tools, as well as devices and equipment for their use, the following hole parameters are brought into accordance with the required values: roughness internal surfaces, taper and alignment.

You can familiarize yourself with the GOST requirements for conical countersinks by downloading the document in pdf format follow the link below.

Types of Hole Making Tools

Both the countersink and the countersink in their own way geometric parameters must meet the requirements specified by the relevant GOST or Specifications(THAT). The working part of the countersink consists of many cutting blades. It is used to process holes previously obtained by drilling. Depending on the design and scope of application, they distinguish the following types countersinks.

• Cylindrical tools, the working part of which is coated with a wear-resistant material. Countersinks of this type, the requirements for which are regulated by GOST 12489-71, are produced with diameters from 10 to 20 mm.
• Solid countersinks conical type, produced in the diameter range of 10–40 mm. The material for the manufacture of these tools, the characteristics of which must meet the requirements of TU 2-035-923-83, can be alloy steel, as well as tool steel alloys. In this case, a wear-resistant coating is applied to the working surface. Tools belonging to this category can be used for machining holes made in steel and cast iron parts.
• Countersinks are of one-piece mounted type, the diameter of which can be in the range of 32–80 mm. They are manufactured in accordance with the requirements established by GOST 12489-71.
• Conical countersinks, which can be of two types: type 1, produced in accordance with GOST 3231-71, and type 2 - a mounted countersink, the requirements for the characteristics of which are regulated by the provisions of the same normative document. The two types of countersinks differ only in the presence of plates on their working part, which are made of carbide material.

A countersink also belongs to the category of multi-blade cutting tools, but it is distinguished from a countersink by a list of technological tasks that can be solved with its help. In particular, using it, you can make recesses in pre-made holes, form chamfers on their surface, etc. The following types of countersinks are distinguished depending on their design.

• Conical countersinks, the working surface of which can be manufactured with angles of 60, 90 and 120°. The production of such countersinks is regulated by GOST 14953-80E, and they are used for processing holes for fasteners, hardware, as well as for removing internal chamfers.
• Cylindrical countersinks, which can be produced with a conical or cylindrical shank, as well as with a wear-resistant coating on the work surface. The regulatory document, the provisions of which regulate the requirements for the characteristics of cylindrical countersinks, is GOST 2I22-2-80. Using such a tool, support-type surfaces are usually processed.

Areas of application for countersinks

Countersinking and countersinking, despite the fact that they are used for processing pre-prepared holes, have a number of fundamental differences. The main purpose of countersinking is to form conical or cylindrical recesses in the upper part of a pre-prepared hole, which are necessary to hide the heads of the fasteners used.

Conical countersink with Morse shank type 8, cutting part material - HSS steel (analogous to P6M5)

Based on the degree of cleanliness of the recess formed during the countersinking process, such a technological operation is classified as semi-finishing. As a rule, it is performed before drilling holes in workpieces made of various materials. The equipment used for countersinking can be drilling, turning, milling and boring machines. Distinctive feature Such a technological operation is that it is performed at low speeds, performed by a countersink or a processed workpiece.

By design countersinks are distinguished:

• conical (GOST 14953-80);
• cylindrical type.

A separate category of countersinks consists of cutters, which are made of carbide materials and are used primarily for grinding and roughing work. Another type of countersinks that are used for machining and chamfering holes located in hard-to-reach places are reverse-type tools. Specialists who often work with countersinks of this type prefer to have at their disposal entire sets of them, which allow them to process holes with various geometric parameters.

Conical countersinks produced in accordance with GOST 14953-80 have a standard design, the constituent elements of which are a shank and a working part with a front end sharpened to a cone. The cone angle that is formed side surfaces the front part of such a countersink can be 60, 75, 90 or 120°. GOST 14953-80 also regulates the number of teeth on the working part, which depends on its diameter.

Yes, on the countersinks various diameters(12–60 mm) may contain from six to twelve cutting teeth. Depending on the length of the tool used for processing, which is also regulated by the provisions of the regulatory document, a trunnion can be used to support it on the machine, ensuring the alignment of the surface being formed.

Cylindrical countersinks, in contrast to conical tools (manufactured according to the requirements specified by GOST 14953-80), are specifically used for cutting chamfers for metal products. The working part of such a countersink, which usually has a wear-resistant coating, resembles a drill, but differs from it in a large number of cutting teeth. Depending on the diameter of the working part, it can have from 4 to 10 cutting teeth. To reliably fix the position of such a tool during its operation, there is a special guide pin at its end - solid or removable. The most convenient and practical to use are countersinks with removable trunnions. In addition, for greater efficiency of the processing performed, an additional cutting attachment can be installed on the countersink.

In order to process several holes to the same depth using one countersink, the tool is equipped with a special holder with a limiter, which can be stationary or rotating. Cutting tool in this case, it is mounted in the holder, and its working part protrudes from its stop by an amount equal to the depth of the hole being machined.

Various metals and alloys can be used as materials for the manufacture of countersinks, in particular:

• alloyed high-speed steel alloys;
• carbide materials.

For processing holes made in soft metals, as well as in materials such as wood or plastic, countersinks made of steel alloys are used. If it is necessary to process holes that are made in products made of more hard metals, then carbide countersinks are used for this. The latter are able to withstand significant loads arising when processing metals with high hardness.

Classification of countersinks

Tools for countersinking, depending on the features of their design, can be:

• tail;
• mounted;
• prefabricated;
• whole.

The working part of such a tool, as mentioned above, resembles a drill, but at the same time it has a large number of cutting edges. The countersink can be made of alloyed high-speed and tool alloys, as well as hard alloys. Cutting edges countersinks made of tool steels are sharpened at an angle of 45–60°, and those made of hard alloys are sharpened at an angle of 60–75°.

Countersinks, the working part of which is sharpened to a cone, process shallow holes of the appropriate configuration. A distinctive feature of this type of tool is the presence of straight teeth on its flat front surface. The number of cutting teeth on the working surface of tools in this category varies from 6 to 12.

INTERSTATE STANDARD

CONICAL COUNTERSOUNTS

TECHNICAL CONDITIONS

Official publication

IPC PUBLISHING HOUSE OF STANDARDS Moscow

INTERSTATE STANDARD

CONICAL COUNTERSOUNTS

Specifications

Taper countersinks. Specifications

MKS 25.100.30 OKP 39243

Date of introduction 01/01/82

This standard applies to conical countersinks for processing center holes in accordance with GOST 14034 and conical countersinks with an apex angle of 90° for processing conical supporting surfaces in accordance with GOST 12876, manufactured for the needs of the country's economy and for export.

1. TYPES AND MAIN DIMENSIONS

1.1. Conical countersinks must be made of the following types:

1 - countersinks with an apex angle of 60° centering;

2 - centering countersinks for center holes with an apex angle of 60° without a safety cone;

3 - centering countersinks for center holes with an apex angle of 60° with a safety cone of 120°;

4 - centering countersinks for center holes with an apex angle of 75° without a safety cone;

5 - countersinks with an apex angle of 60° with a cylindrical shank;

6 - countersinks with an apex angle of 90° with a cylindrical shank;

7 - countersinks with an apex angle of 120° with a cylindrical shank;

8 - countersinks with an apex angle of 60° with a conical shank;

9 - countersinks with an apex angle of 75° with a conical shank;

10 - countersinks with an apex angle of 90° with a conical shank;

11 - countersinks with an apex angle of 120° with a conical shank.

1.2. The main dimensions of the countersinks must correspond to those indicated in the drawing. 1-6 and in table.

Table 1mm

Example symbol countersinks type 1, diameter D = 5 mm:

Countersink 2353-0081 TOST 14953-80

Official publication Reproduction prohibited

© Standards Publishing House, 1981 © IPK Standards Publishing House, 2003

Table 2 mm

An example of a symbol for a countersink type 2, diameter D = 5 mm:

Countersink 2353-0083 GOST 14953-80 Type 3

Table 3 mm

An example of a symbol for a countersink type 3, diameter D = 5 mm:

Countersink 2357-0001 GOST 14953-80

An example of a symbol for a countersink type 4, diameter D = 6.3 mm:

Countersink 2353-0089 GOST 14953-80

Types 5, 6, 7

Table 5 mm

Continuation of the table. 5

An example of a symbol for a countersink type 6, diameter D = 10 mm:

Countersink 2353-0108 TOST 14953-80

Types 8, 9, 10, 11

Continuation of the table. 6

* For type 9.

An example of a symbol for a countersink type 8, diameter D = 16 mm:

Countersink 2353-0121 GOST 14953-80

(Changed edition, Amendment No. 1).

1.3. Dimensions of Morse cones - according to GOST 25557. Tolerance of Morse cones AT8 - according to GOST 2848.

1.4. Center holes of form A (shape R is allowed) according to GOST 14034, for countersinks with d 0<7 мм со стороны рабочей части центровые отверстия не изготавливать.

1.5. The design dimensions and geometric parameters of the countersinks are indicated in Appendix 1.

2. TECHNICAL REQUIREMENTS

2.1. (Deleted, Amendment No. 2).

2.2. Countersinks must be made from high-speed steel in accordance with GOST 19265. It is allowed to manufacture countersinks from other grades of high-speed steel, ensuring the performance and durability of countersinks are not inferior to countersinks made from high-speed steel in accordance with GOST 19265. By agreement with the consumer, it is allowed to manufacture countersinks from tool alloy steel grade 9ХС according to GOST 5950.

2.3. Countersinks made of high-speed steel with a cylindrical shank with diameters from 8 to 16 mm should be made in one piece, with diameters of 20 and 25 mm - welded. High-speed steel countersinks with a conical shank must be manufactured welded.

The following are not allowed in the welding zone: lack of penetration, ring cracks, surface holes.

It is allowed to manufacture soldered countersinks with cylindrical and conical shanks with diameters from 12.5 to 25 mm.

Brass grade L63 according to GOST 15527 should be used as solder.

2.4. The shanks of welded and brazed countersinks must be made of steel grade 45 according to GOST 1050 or grade 40X according to GOST 4543.

2.5. The hardness of the working part of the countersinks should be:

for countersinks made of high-speed steel with a diameter of up to 3.15 mm - 63 ... 65 HRC 3, over 3.15 mm - 63 ... 66 HRC 3;

for countersinks made of steel grade 9ХС - 62 ... 65 HRC 3.

The hardness of the working part of countersinks made of high-speed steel with a vanadium content of 3% or more and cobalt of 5% or more should be higher by 1-2 HRC 3 units.

2.6. The hardness of the jaws for countersinks with a conical shank should be 32 ... 47 HRC 3.

2.7. The surface of the countersinks should not have cracks or signs of corrosion. Sanded surfaces should not have dents or rough spots. There should be no tarnish on the front and back surfaces, on the surfaces of the ribbons and the shank. Cutting edges must be sharp; debris and chipped areas on cutting edges are not allowed.

(Changed edition, Amendment No. 1, 2).

2.8. The roughness parameters of countersink surfaces according to GOST 2789 should be, microns, no more than:

front and rear surfaces of countersinks types:

1-4............................................. ............Rz 6.3

5-11................................................... ............Rz 3.2

surfaces of chip flutes...................................Rz. 10

surface of the clamping cylindrical part, cylindrical and conical

shank........................................................ .......Ra 0.8

other surfaces........................................Rz 20

2.9. On the back surface of the teeth of countersinks of types 5-11 along the main cutting edges, a ribbon with a width of no more than 0.05 mm is allowed.

2.10. Maximum deviations of countersink dimensions should be no more than:

total length L................................................... ....Н6

diameter of the clamping cylindrical part................................h9

cone angles 60° and 75°............................................... ...-20"

cone angles 90° and 120°............................................... ..-G

length of cylindrical shank...................................±1 mm

2.11. The runout tolerance of the cutting edges of the countersink part for countersinks of types 1-4 relative to the surface of the clamping part, measured perpendicular to these edges, should be for countersinks with a diameter of:

up to 3.15 mm. St. 3.15 mm

0.03 mm 0.04 mm

2.12. The runout tolerance of the cutting edges of countersinks of types 5-11 relative to the surface of the shank, measured perpendicular to these edges, should be 0.05 mm.

2.13. The average and established periods of resistance of countersinks must be no less than those indicated in the table. 7 subject to the tests given in Section. 4.

Table 7

which should not be more than 0.6 mm for countersinks types 1-4 and 0.8 mm for countersinks types 5-11.

2.13, 2.14. (Introduced additionally, Amendment No. 1).

3. ACCEPTANCE RULES

3.1 Acceptance rules - according to GOST 23726.

3.2. Periodic tests, including those for the average durability period, must be carried out once every three years on at least 5 countersinks.

Tests for the specified durability period must be carried out once a year on at least 5 countersinks.

(Changed edition, Amendment No. 1).

4. TEST METHODS

4.1. Tests of countersinks must be carried out on centering, lathe or drilling machines using chucks and collets that meet the accuracy standards established for them.

4.2. Countersinks should be tested on samples made of steel grades 45 or 50 according to GOST 1050, hardness HB 179. . . 197 through pre-drilled holes corresponding to GOST 14034 and GOST 12876 for countersinks types 6 and 10.

4.3. Resistance tests are carried out on countersinks with a diameter of 8 mm for type 1; 6.3 mm for types 2-4, 20 mm for types 5-11. It is allowed to additionally test countersinks of other standard sizes from those regulated by the standard.

4.1-4.3. (Changed edition, Amendment No. 1).

4.3.1. Tests should be carried out in the modes indicated in table. 8.

Table 8

Notes:

1. The rotation speed for countersinks of types 1-4 is determined by the diameter of the machined hole, and for countersinks of types 5-11 - by the largest diameter of the countersunk hole.

For countersinks types 7 and 11, the hole must be pre-countersunked.

2. When testing countersinks made of 9ХС steel, the cutting speed is assumed to be equal to 0.6 of the cutting speed of countersinks made of high-speed steel.

4.4. Acceptance values ​​of the average and established durability periods should not be less than those indicated in the table. 9.

4.5. When testing for performance, three holes must be machined with each working end of the countersink for the length of the conical part of the countersink, and for countersinks of types 2-4 - five holes.

4.6. A 5% solution of emulsol in water with a flow rate of at least 5 l/min should be used as a cutting fluid.

4.7. After performance testing, the cutting edges of the countersinks should be free of dents and chipping and should be suitable for further work.

4.4-4.7. (Changed edition, Rev. 1, 2).

4.8. Appearance control is carried out visually.

4.9. Control of countersink parameters is carried out by means of control, the error of which should not be more than:

when measuring linear dimensions - the values ​​​​specified in GOST 8.051;

when measuring angles - 35% of the tolerance values ​​for the angle being tested;

when monitoring the shape and location of surfaces - 25% of the tolerance values ​​for the parameter being tested.

4.10. The hardness of countersinks is measured according to GOST 9013.

4.11. The surface roughness parameters of countersinks should be checked by comparison with roughness samples in accordance with GOST 9378 or with standard tools having surface roughness parameters values ​​not exceeding those specified in clause 2.8.

Comparison is carried out visually using a 2-4 x magnifying glass according to GOST 25706.

4.8-4.11. (Introduced additionally, Amendment No. 1).

5. LABELING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. The following must be clearly marked on the neck, shank or holder of the countersink:

a) trademark of the manufacturer;

b) diameter d for countersinks of types 2-4 or diameter D for countersinks of types 1.5-11;

c) countersink cone angle;

d) countersink designation (last four digits);

e) grade of steel of the cutting part (on countersinks made of high-speed steel).

Notes: 1. On countersinks of types 1-4 with diameter 7) from 5 to 8 mm and types 5-7 with diameter D from 8 to 12.5 mm, it is allowed to mark only the data specified in subparagraphs a, b, c.

2. Marking on the shanks or holders of countersinks may be applied by electrochemical, chemical or other methods that do not affect the quality of the surface and provided that their geometric shapes are preserved, as well as in the recess for marking.

3. (Deleted, Amendment No. 1).

4. Steel grade R6M5 and R6AM5 may not be marked.

5. Instead of the high-speed steel grade, it is allowed to mark the letters “HS” for steel with a tungsten content up to 3% inclusive, the letters “HSS” for steel with a tungsten content of 6% or more, the letters “HSSCo” for steel containing cobalt, with an indication steel grades on labels.

Table 9

5.2. The option for internal packaging of countersinks is VU-1 according to GOST 9.014.

5.1, 5.2. (Changed edition, Amendment No. 1, 2).

5.3. Other requirements for packaging, labeling, transportation and storage are in accordance with GOST 18088.

(Introduced additionally, Amendment No. 1).

Sec. 6. (Deleted, Amendment No. 1).

CONSTRUCTION DIMENSIONS AND GEOMETRICAL PARAMETERS OF COUNTERSOCKERS

1. The design dimensions and geometric parameters of the countersinks must correspond to those indicated in the drawing. 1-6 and in table. 1-6.

Table 1

Table 2 mm

Table 3 mm

Table 4mm

Types 5, 6, 7

Dimensions in mm

Table 5

* Size on small diameter.

Types 8, 9, 10, 11

Dimensions in mm

Table 6

Dimensions in mm

Continuation of the table. 6

* Size on small diameter.

(Changed edition, Amendment No. 1).

2. For countersinks of types 1-4, the relief angle at the periphery of the cutting part in a plane parallel to the axis of the countersink is 14-11°.

APPENDIX 2. (Deleted, Amendment No. 1).

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Machine Tool and Tool Industry of the USSR

2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee on Standards dated December 30, 1980 No. 6138

3. The standard fully complies with ST SEV 698-77 and ST SEV 699-77

4. INSTEAD GOST 14953-69, MN 725-60

5. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS

6. The validity period was removed by Decree of the USSR State Standard of 10/11/91 No. 1607

7. EDITION (August 2003) with Amendments No. 1, 2, approved in December 1986, March 1989 (IUS 3-87, 6-89)

Editor L.V. Koretnikova Technical editor O.N. Vlasova Corrector M.S. Kabashova Computer layout S.V. Ryabova

Ed. persons No. 02354 dated July 14, 2000. Delivered for recruitment on 07/07/2003. Signed for publication on September 10, 2003. Cond.bake.l. 2.32. Academician-ed.l. 1.40.

Circulation 106 copies. From 11821. Zak. 775.

IPK Standards Publishing House, 107076 Moscow, Kolodezny per., 14. e-mail:

Typed at the Publishing House on a PC

Branch of IPK Standards Publishing House - type. “Moscow Printer”, 105062 Moscow, Lyalin lane, 6.

TECHNICAL CONDITIONS

Official publication

IPC PUBLISHING HOUSE OF STANDARDS Moscow

INTERSTATE STANDARD

CONICAL COUNTERSOUNTS

Specifications

Taper countersinks. Specifications

MKS 25.100.30 OKP 39243

Date of introduction 01/01/82

This standard applies to conical countersinks for processing center holes in accordance with GOST 14034 and conical countersinks with an apex angle of 90° for processing conical supporting surfaces in accordance with GOST 12876, manufactured for the needs of the country's economy and for export.

1. TYPES AND MAIN DIMENSIONS

1.1. Conical countersinks must be made of the following types:

1 - countersinks with an apex angle of 60° centering;

2 - centering countersinks for center holes with an apex angle of 60° without a safety cone;

3 - centering countersinks for center holes with an apex angle of 60° with a safety cone of 120°;

4 - centering countersinks for center holes with an apex angle of 75° without a safety cone;

5 - countersinks with an apex angle of 60° with a cylindrical shank;

6 - countersinks with an apex angle of 90° with a cylindrical shank;

7 - countersinks with an apex angle of 120° with a cylindrical shank;

8 - countersinks with an apex angle of 60° with a conical shank;

9 - countersinks with an apex angle of 75° with a conical shank;

10 - countersinks with an apex angle of 90° with a conical shank;

11 - countersinks with an apex angle of 120° with a conical shank.

1.2. The main dimensions of the countersinks must correspond to those indicated in the drawing. 1-6 and in table.

An example of a symbol for a countersink type 1, diameter D = 5 mm:

Official publication Reproduction prohibited

© Standards Publishing House, 1981 © IPK Standards Publishing House, 2003

5.2. The option for internal packaging of countersinks is VU-1 according to GOST 9.014.

5.1, 5.2. (Changed edition, Amendment No. 1, 2).

5.3. Other requirements for packaging, labeling, transportation and storage are in accordance with GOST 18088.

Sec. 6. (Deleted, Amendment No. 1).

CONSTRUCTION DIMENSIONS AND GEOMETRICAL PARAMETERS OF COUNTERSOCKERS

1. The design dimensions and geometric parameters of the countersinks must correspond to those indicated in the drawing. 1-6 and in table. 1-6.

GOST 14953-80 S. 13

* Size on small diameter.

(Changed edition, Amendment No. 1).

2. For countersinks of types 1-4, the relief angle at the periphery of the cutting part in a plane parallel to the axis of the countersink is 14-11°.

APPENDIX 2. (Deleted, Amendment No. 1).

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Machine Tool and Tool Industry of the USSR

2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee on Standards dated December 30, 1980 No. 6138

3. The standard fully complies with ST SEV 698-77 and ST SEV 699-77

5. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS

7. EDITION (August 2003) with Amendments No. 1, 2, approved in December 1986, March 1989 (NUS 3-87, 6-89)

Editor L.V. Koretnikova Technical editor O.N. Vlasova Corrector M.S. Kabashova Computer layout S.V. Ryabova

Ed. persons No. 02354 dated July 14, 2000. Delivered for recruitment on 07/07/2003. Signed for publication on September 10, 2003. Cond.bake.l. 2.32. Academician-ed.l. 1.40.

Circulation 106 copies. From 11821. Zak. 775.

IPC Standards Publishing House, 107076 Moscow, Kolodezny lane, 14. http://www.standards.ru e-mail: [email protected]

Typed in the Publishing House on a PC Branch of the IPK Standards Publishing House - type. “Moscow Printer”, 105062 Moscow, Lyalin lane, 6.

Plr No. 080102

An example of a symbol for a countersink type 2, diameter D = 5 mm:

GOST 14953-80
Group G23

INTERSTATE STANDARD

CONICAL COUNTERSOUNTS

Specifications

Taper countersinks. Specifications

ISS 25.100.30
OKP 39243

Date of introduction 1982-01-01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Machine Tool and Tool Industry of the USSR

2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee on Standards dated December 30, 1980 N 6138

3. The standard fully complies with ST SEV 698-77 and ST SEV 699-77

4. INSTEAD GOST 14953-69, MN 725-60

5. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS

6. The validity period was removed by Decree of the USSR State Standard of 10/11/91 N 1607

7. EDITION (August 2003) with Amendments No. 1, 2, approved in December 1986, March 1989 (IUS 3-87, 6-89)

This standard applies to conical countersinks for processing center holes in accordance with GOST 14034 and conical countersinks with an apex angle of 90° for processing conical supporting surfaces in accordance with GOST 12876, manufactured for the needs of the country's economy and for export.

1. TYPES AND MAIN DIMENSIONS

1. TYPES AND MAIN DIMENSIONS

1.1. Conical countersinks must be made of the following types:

1 - countersinks with an apex angle of 60° centering;

2 - centering countersinks for center holes with an apex angle of 60° without a safety cone;

3 - centering countersinks for center holes with an apex angle of 60° with a safety cone of 120°;

4 - centering countersinks for center holes with an apex angle of 75° without a safety cone;

5 - countersinks with an apex angle of 60° with a cylindrical shank;

6 - countersinks with an apex angle of 90° with a cylindrical shank;

7 - countersinks with an apex angle of 120° with a cylindrical shank;

8 - countersinks with an apex angle of 60° with a conical shank;

9 - countersinks with an apex angle of 75° with a conical shank;

10 - countersinks with an apex angle of 90° with a conical shank;

11 - countersinks with an apex angle of 120° with a conical shank.

1.2. The main dimensions of the countersinks must correspond to those indicated in Figures 1-6 and in Tables 1-6.

Damn.1. Type 1

Type 1

Table 1

An example of a symbol for a countersink type 1, diameter = 5 mm:

Countersink 2353-0081 GOST 14953-80

Damn.2. Type 2

Type 2

table 2

An example of a symbol for a countersink type 2, diameter = 5 mm:

Countersink 2353-0083 GOST 14953-80

Damn.1. Type 3

Type 3

Table 3

An example of a symbol for a countersink type 3, diameter = 5 mm:

Countersink 2357-0001 GOST 14953-80

Damn.4. Type 4

Type 4

Table 4

An example of a symbol for a countersink type 4, diameter = 6.3 mm:

Countersink 2353-0089 GOST 14953-80

Damn.5. Types 5, 6, 7

Types 5, 6, 7

Table 5

An example of a symbol for a countersink type 6, diameter = 10 mm:

Countersink 2353-0108 GOST 14953-80

Damn.6. Types 8, 9, 10, 11

Types 8, 9, 10, 11

Table 6

Dimensions, mm

______________
* For type 9.

An example of a symbol for a countersink type 8, diameter = 16 mm:

Countersink 2353-0121 GOST 14953-80

(Changed edition, Amendment No. 1).

1.3. Dimensions of Morse cones - according to GOST 25557. Tolerance of Morse cones AT8 - according to GOST 2848.

1.4. Center holes of form A (form R is allowed) in accordance with GOST 14034; for countersinks with 7 mm on the side of the working part, do not make center holes.

1.5. The design dimensions and geometric parameters of the countersinks are indicated in Appendix 1.

2. TECHNICAL REQUIREMENTS

2.1. (Deleted, Amendment No. 2).

2.2. Countersinks must be made from high-speed steel in accordance with GOST 19265. It is allowed to manufacture countersinks from other grades of high-speed steel, ensuring the performance and durability of countersinks are not inferior to countersinks made from high-speed steel in accordance with GOST 19265. By agreement with the consumer, it is allowed to manufacture countersinks from tool alloy steel grade 9ХС according to GOST 5950.

2.3. Countersinks made of high-speed steel with a cylindrical shank with diameters from 8 to 16 mm should be made in one piece, with diameters of 20 and 25 mm - welded. High-speed steel countersinks with a conical shank must be manufactured welded.
The following are not allowed in the welding zone: lack of penetration, ring cracks, surface holes.
It is allowed to manufacture soldered countersinks with cylindrical and conical shanks with diameters from 12.5 to 25 mm.
Brass grade L63 according to GOST 15527* should be used as solder.
________________
* GOST 15527-2004 is in force on the territory of the Russian Federation. - Note.

2.4. The shanks of welded and brazed countersinks must be made of steel grade 45 according to GOST 1050 or grade 40X according to GOST 4543.

2.5. The hardness of the working part of the countersinks should be:
for countersinks made of high-speed steel with a diameter of up to 3.15 mm - 63...65 HRC, over 3.15 mm - 63...66 HRC;
for countersinks made of steel grade 9ХС - 62...65 HRC.
The hardness of the working part of countersinks made of high-speed steel containing vanadium 3% or more and cobalt 5% or more should be higher by 1-2 HRC units.

2.6. The hardness of the legs for countersinks with a conical shank should be 32...47 HRC.

2.7. The surface of the countersinks should not have cracks or signs of corrosion. Sanded surfaces should not have dents or rough spots. There should be no tarnish on the front and back surfaces, on the surfaces of the ribbons and the shank. Cutting edges must be sharp; debris and chipped areas on cutting edges are not allowed.
(Changed edition, Amendment No. 1, 2).

2.8. The roughness parameters of countersink surfaces according to GOST 2789 should be, microns, no more than:
front and rear surfaces of countersinks types:

2.9. On the back surface of the teeth of countersinks of types 5-11 along the main cutting edges, a ribbon with a width of no more than 0.05 mm is allowed.

2.10. Maximum deviations of countersink dimensions should be no more than:

2.11. The runout tolerance of the cutting edges of the countersink part for countersinks of types 1-4 relative to the surface of the clamping part, measured perpendicular to these edges, should be for countersinks with a diameter of:

2.12. The runout tolerance of the cutting edges of countersinks of types 5-11 relative to the surface of the shank, measured perpendicular to these edges, should be 0.05 mm.

2.13. The average and established periods of resistance of countersinks must be no less than those indicated in Table 7, subject to the tests given in Section 4.

Table 7

2.13, 2.14. (Introduced additionally, Amendment No. 1).

3. ACCEPTANCE RULES

3.1 Acceptance rules - according to GOST 23726.

3.2. Periodic tests, including those for the average durability period, must be carried out once every three years on at least 5 countersinks.
Tests for the specified durability period must be carried out once a year on at least 5 countersinks.
(Changed edition, Amendment No. 1).

4. TEST METHODS

4.1. Tests of countersinks must be carried out on centering, lathe or drilling machines using chucks and collets that meet the accuracy standards established for them.

4.2. Countersinks must be tested on samples made of steel grades 45 or 50 according to GOST 1050, hardness HB 179...197 using pre-drilled holes corresponding to GOST 14034 and GOST 12876 for countersinks of types 6 and 10.

4.3. Resistance tests are carried out on countersinks with a diameter of 8 mm for type 1; 6.3 mm for types 2-4, 20 mm for types 5-11. It is allowed to additionally test countersinks of other standard sizes from those regulated by the standard.

4.1-4.3. (Changed edition, Amendment No. 1).

4.3.1. Tests should be carried out at the modes indicated in Table 8.

Table 8

Notes:

1. The rotation speed for countersinks of types 1-4 is determined by the diameter of the machined hole, and for countersinks of types 5-11 - by the largest diameter of the countersunk hole.
For countersinks types 7 and 11, the hole must be pre-countersunked.

2. When testing countersinks made of 9ХС steel, the cutting speed is assumed to be equal to 0.6 of the cutting speed of countersinks made of high-speed steel.

4.4. Acceptance values ​​of the average and established durability periods should not be less than those indicated in Table 9.

Table 9

4.5. When testing for performance, three holes must be machined with each working end of the countersink for the length of the conical part of the countersink, and for countersinks of types 2-4 - five holes.

4.6. A 5% solution of emulsol in water with a flow rate of at least 5 l/min should be used as a cutting fluid.

4.7. After performance testing, the cutting edges of the countersinks should be free of dents and chipping and should be suitable for further work.

4.4-4.7. (Changed edition, Rev. 1, 2).

4.8. Appearance control is carried out visually.

4.9. Control of countersink parameters is carried out by means of control, the error of which should not be more than:
when measuring linear dimensions - the values ​​​​specified in GOST 8.051;
when measuring angles - 35% of the tolerance values ​​for the angle being tested;
when controlling the shape and location of surfaces - 25% of the tolerance values ​​for the parameter being tested.

4.10. The hardness of countersinks is measured according to GOST 9013.

4.11. The surface roughness parameters of countersinks should be checked by comparison with roughness samples in accordance with GOST 9378 or with standard tools having surface roughness parameters values ​​not exceeding those specified in clause 2.8.
Comparison is carried out visually using a magnifying glass 2-4 according to GOST 25706.

4.8-4.11. (Introduced additionally, Amendment No. 1).

5. LABELING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. The following must be clearly marked on the neck, shank or holder of the countersink:

a) trademark of the manufacturer;

b) diameter for countersinks types 2-4 or diameter for countersinks types 1.5-11;

c) countersink cone angle;

d) countersink designation (last four digits);

e) grade of steel of the cutting part (on countersinks made of high-speed steel).
Notes: 1. On countersinks of types 1-4 with a diameter of 5 to 8 mm and types 5-7 with a diameter of 8 to 12.5 mm, it is allowed to mark only the data specified in subparagraphs a, b, c.

2. Marking on the shanks or holders of countersinks may be applied by electrochemical, chemical or other methods that do not affect the quality of the surface and provided that their geometric shapes are preserved, as well as in the recess for marking.

3. (Deleted, Amendment No. 1).

4. Steel grade R6M5 and R6AM5 may not be marked.

5. Instead of the high-speed steel grade, it is allowed to mark the letters “HS” for steel with a tungsten content up to 3% inclusive, the letters “HSS” for steel with a tungsten content of 6% or more, the letters “HSSCo” for steel containing cobalt, with an indication steel grades on labels.

5.2. The option for internal packaging of countersinks is VU-1 according to GOST 9.014.

5.1, 5.2. (Changed edition, Amendment No. 1, 2).

5.3. Other requirements for packaging, labeling, transportation and storage are in accordance with GOST 18088.
(Introduced additionally, Amendment No. 1).
Section 6. (Deleted, Amendment No. 1).

APPENDIX 1 (recommended). CONSTRUCTION DIMENSIONS AND GEOMETRICAL PARAMETERS OF COUNTERSOCKERS

1. The design dimensions and geometric parameters of the countersinks must correspond to those indicated in Figures 1-6 and Tables 1-6.

Damn.1. Type 1

Type 1

Table 1

Damn.2. Type 2

Type 2

table 2

Damn.3. Type 3

Type 3

Table 3

Damn.4. Type 4

Type 4

Damn.4

Table 4

Damn.5. Types 5, 6, 7

Types 5, 6, 7

Table 5

Dimensions in mm

_______________
* Size on small diameter.

Damn.6. Types 8, 9, 10, 11

Types 8, 9, 10, 11

Damn.6

Table 6

Dimensions in mm

Continuation of Table 6

Dimensions in mm

_____________
* Size on small diameter.

(Changed edition, Amendment No. 1).

2. For countersinks of types 1-4, the relief angle at the periphery of the cutting part in a plane parallel to the axis of the countersink is 14-11°.
APPENDIX 2. (Deleted, Amendment No. 1).

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