GOST reference prism. Machine prisms. Machine tools. Support prisms. Design

Machine tools. Support prisms, GOST 12195-66

Engineering. GOST 12195-66: Machine attachments. Support prisms. Design. OKS: Mechanical engineering, Machine-tool systems. GOSTs. Machine tools. Support prisms. Design. class=text>

GOST 12195-66

Machine tools. Support prisms. Design

GOST 12195-66
Group G27

STATE STANDARD OF THE UNION OF THE SSR

Machine tools

SUPPORT PRISMS

Design

holding devices. Knife edges. design

Introduction date 1967-07-01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Heavy, Energy and Transport Engineering of the USSR
Ministry of Machine-Tool and Tool Industry of the USSR
DEVELOPERS

V.V. Andreev; V.N.Dzegilenok, Ph.D. tech. sciences; E.M. Kovalenko; V.A. Petrova; K.I. Sokolsky; A.3. Staroselsky (topic leader); A.V. Khrenova

2. APPROVED AND INTRODUCED BY Decree of the Committee of Standards, Measures and Measuring Instruments under the Council of Ministers of the USSR dated 10.08.66 N 918

3. Period of inspection - 1993 Periodicity of inspection - 5 years

4. REPLACE MN 344-60

5. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

6. REPUBLICATION (July 1990) with CHANGES N 1, 2, approved in June 1980, March 1988 (IUS 9-80, 6-88)

7. Checked in 1988. Validity limit removed (Resolution of the USSR State Committee for Standards dated 17.03.88 N 584)

1. The design and dimensions of the support prisms must comply with the drawing and table.

Drawing. Design and dimensions of support prisms

Dimensions in mm

Dimensions for control

Designation
prisms

At-
me-
nyah-
bridge

Clamping diameters

diam. cont. shaft

Mas-
sa, kg

5 to 10

St. 10 to 15

St. 15 to 20

St. 20 to 25

St. 25 to 35

St. 35 to 45

St. 45 to 60

St. 60 to 80

St. 80 to 100

St. 100 to 150

________________

* The size is determined by the formula.

Example symbol reference prism for parts with a diameter of 5 to 10 mm:

Prism 7033-0031 GOST 12195-66

(Changed edition, Rev. N 1, 2).

2. Material - steel grade 20X according to GOST 4543-71. It is allowed to replace it with steel of other grades with mechanical properties not lower than those of steel grade 20X.

3. Hardness of working surfaces - 56...61 HRC. Cement h 0.8...1.2 mm.

3a. Support surfaces for fasteners - according to GOST 12876.
(Introduced additionally, Rev. N 1).

4. Unspecified prev. off sizes: H14, h14, .
(Changed edition, Rev. N 2).

5. (Cancelled, Rev. N 1).

6. Coating - Chem. Oks. prm. (coating designation - according to GOST 9.306).
(Changed edition, Rev. N 1).

7. Mark a batch of parts of the same standard size on containers or packaging indicating the symbol.
(Changed edition, Rev. N 2).

8. An example of the use of a reference prism is given in the appendix.
(Introduced additionally, Rev. N 2).

APPENDIX (reference). REFERENCE PRISM APPLICATION EXAMPLE

APPLICATION
Reference

REFERENCE PRISM APPLICATION EXAMPLE

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To base the shafts, prisms are used as permanent, supporting, movable and fixed installation elements. Prisms usually have an angle a = 90°, are made of steel 20Kh with carburization to a depth of about 1 mm to ensure hardness up to 61 HRC. The ultimate load on the prism is determined by the formula

Where d- workpiece base diameter; / - the length of the contact lines of the workpiece with the prism.

Contact with the prism of machined shafts is usually carried out on flat surfaces (Fig. 1.15, A, b) and for unprocessed shafts it is more expedient to use prisms with four additional supports (Fig. 1.15, V).

Rice. 1.15. Schemes of prisms with flat surfaces (a, b) and additional supports (c)

Rice. 1.16. basing scheme (A) and installation (b) of the shaft in a prism with an emphasis on the end

Depending on the processing conditions of the shafts, various designs of prisms are selected.

To get the size set from the end, it is necessary to install the workpiece with this end into the prism support. The scheme of basing a shaft with an end stop in the form of a cylindrical support is shown in fig. 1.16b).

On fig. 1.17 a, b a diagram of a device with a prism for milling planes on shafts in small-scale production is presented. Similar devices are used for

Rice. 1.17.

7 - body; 2 - cylindrical guides; 3 - prism; 4 - screw; 5 - shaft blank

Rice. 1.18.

cutting of cylindrical blanks. As a supplement from above, a cylindrical workpiece can be pressed by a prism, which increases the contact area and, consequently, reduces the specific load, which is very important when processing hollow workpieces. In large-scale production, automatic fixtures with hydraulic panels, a dividing disc and hydraulic cylinders are used.

When processing the ends of workpieces installed in prisms, in addition to the force acting along the axis, at the moment of cutting the cutter, the cutting forces tend to rotate the workpiece around its axis (Fig. 1.18). When the teeth of the end mill touch the end of the workpiece, these forces are maximum, but as they approach the center of the workpiece, they decrease, in the center they can be equated to zero, and then the moment of the cutting force increases again, trying to turn the workpiece, but in the opposite direction.

When clamping the workpiece, the resulting force of the cut should be taken into account. and I P 0 as the sum of the district R ok and axial R os cutting forces,

those. R" = 4 + Plc. Approximate relationships between forces should be taken into account R oc ~ 0,5R ok, R p ~ 1.1R 0K. In this case, the clamping force of the workpiece Q can be determined by the formula

Where TO - safety factor; R p - resulting cutting force; / - coefficient of friction.

The offset of the center of the workpiece 00 (mounted on a prism) can be determined by the formula

Rice. 1.19.

Rice. 1.20.

Therefore, the angle of the prism has an effect on the oscillation of the axis of the workpiece. For example, when a = 90° 00, = °°, since the workpiece falls between two parallel surfaces of the fixture. At a = 180° 00, = Td/2, as the workpiece is set on a plane. At a = 30° 00, = 2Td, at a = 60° 00, = td, at a \u003d 90 ° 00, \u003d 0.71 td, at a \u003d 120 ° 00, \u003d 0.6 td, at a = 150° 00, = 0.53 Td.

In order to ensure self-centering, fixtures are made with two converging prisms (Fig. 1.19). In this case, various mechanisms, including eccentric ones, can be used as a drive.

Drilling an axial hole in shafts (Fig. 1.20) is usually easier than a radial one. If the shaft has a flat, then it is advisable to use it for better fixation of the workpiece.

For example, when drilling a hole and installing a smooth shaft in a prism, the workpiece can move due to the force P 0 in the axial direction, creating the risk of the workpiece being torn off from the base turning surface (Fig. 1.21).

Rice. 1.21.

Rice. 1.22.

The force of fixing the workpiece in the prism when drilling a hole (without taking into account the feed force) can be determined by the formula

Where M- torque on the drill; TO- safety factor; dCB- drill diameter; a is half the angle of the prism.

On fig. 1.22 shows a diagram of a stationary conductor to a single-spindle drilling machine with a pressure plate, consisting of a base mounted on the machine table, columns and a jig plate connected to the spindle holder. A feature of this scheme is that the jig plate goes down and presses the workpiece with the force of compressed springs.

GOST 12195-66

Group G27

STATE STANDARD OF THE UNION OF THE SSR

Machine tools

SUPPORT PRISMS

Design

holding devices. Knife edges. design

Introduction date 1967-07-01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Heavy, Energy and Transport Engineering of the USSR

Ministry of Machine-Tool and Tool Industry of the USSR

DEVELOPERS

V.V. Andreev; V.N.Dzegilenok, Ph.D. tech. sciences; E.M. Kovalenko; V.A. Petrova; K.I. Sokolsky; A.3. Staroselsky (topic leader); A.V. Khrenova

2. APPROVED AND INTRODUCED BY Decree of the Committee of Standards, Measures and Measuring Instruments under the Council of Ministers of the USSR dated 10.08.66 N 918

3. Period of inspection - 1993 Periodicity of inspection - 5 years

4. REPLACE MN 344-60

5. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS


	Item number

6. REPUBLICATION (July 1990) with CHANGES N 1, 2, approved in June 1980, March 1988 (IUS 9-80, 6-88)

7. Checked in 1988. Validity limit removed (Resolution of the USSR State Committee for Standards dated 17.03.88 N 584)

1. The design and dimensions of the support prisms must comply with the drawing and table.

Drawing. Design and dimensions of support prisms

Dimensions in mm

Dimensions for control

Designation
prisms

At-
me-
nyah-
bridge

Clamping diameters

diam. cont. shaft

Mas-
sa, kg

5 to 10

St. 10 to 15

St. 15 to 20

St. 20 to 25

St. 25 to 35

St. 35 to 45

St. 45 to 60

St. 60 to 80

St. 80 to 100

St. 100 to 150

________________

* The size is determined by the formula.

An example of a symbol for a reference prism for parts with a diameter of 5 to 10 mm:

Prism 7033-0031 GOST 12195-66

(Changed edition, Rev. N 1, 2).

2. Material - steel grade 20X according to GOST 4543-71. It is allowed to replace it with steel of other grades with mechanical properties not lower than those of steel grade 20X.

3. Hardness of working surfaces - 56...61 HRC. Cement h 0.8...1.2 mm.

3a. Support surfaces for fasteners - according to GOST 12876.

(Introduced additionally, Rev. N 1).

4. Unspecified prev. off sizes: H14, h14, .

(Changed edition, Rev. N 2).

5. (Cancelled, Rev. N 1).

6. Coating - Chem. Oks. prm. (coating designation - according to GOST 9.306).

(Changed edition, Rev. N 1).

7. Mark a batch of parts of the same standard size on containers or packaging indicating the symbol.

(Changed edition, Rev. N 2).

8. An example of the use of a reference prism is given in the appendix.

(Introduced additionally, Rev. N 2).

APPENDIX (reference). REFERENCE PRISM APPLICATION EXAMPLE

APPLICATION
Reference

REFERENCE PRISM APPLICATION EXAMPLE

The text of the document is verified by:
official publication
Machine tools. Details and knots.
GOST 12189-66 - GOST 12219-66.
Part one: Sat. GOSTs. -
M.: Publishing house of standards, 1992

GOST 12195-66 Machine accessories. Support prisms. Design (with Changes N 1, 2)

Adopted August 10, 1966
Committee of Standards, Measures and Measuring Instruments under the Council of Ministers of the USSR

GOST 12195-66
Group G27
STATE STANDARD OF THE UNION OF THE SSR
Machine tools
SUPPORT PRISMS
Design
holding devices. Knife edges. design
Introduction date 1967-07-01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Heavy, Energy and Transport Engineering of the USSR
Ministry of Machine-Tool and Tool Industry of the USSR
DEVELOPERS
V.V. Andreev; V.N.Dzegilenok, Ph.D. tech. sciences; E.M. Kovalenko; V.A. Petrova; K.I. Sokolsky; A.3. Staroselsky (topic leader); A.V. Khrenova
2. APPROVED AND INTRODUCED BY Decree of the Committee of Standards, Measures and Measuring Instruments under the Council of Ministers of the USSR dated 10.08.66 N 918
3. Period of inspection - 1993 Periodicity of inspection - 5 years
4. REPLACE MN 344-60
5. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS
6. REPUBLICATION (July 1990) with CHANGES N 1, 2, approved in June 1980, March 1988 (IUS 9-80, 6-88)
7. Checked in 1988. Validity limit removed (Resolution of the USSR State Committee for Standards dated 17.03.88 N 584)
1. The design and dimensions of the support prisms must comply with the drawing and table.
Dimensions in mm
ref. H7 Designation of prisms Applicability Clamping diameters diam. cont. shaft * h6 Weight, kg7033-0031 5 to 10 16 10 32 8 4.5 4 20 6 7.5 5 5 2 0.6 0.6 8 15.66 0.0320032 Over 10 to 15 20 12 38 14 5.5 26 8 10.0 6 7 4 1.0 12 19.49 0.0550033 Over 15 to 20 25 16 48 18 6.6 5 32 9 12.0 8 9 6 18 28.73 0.1130034 Over 20 to 25 20 55 24 40 11 8 22 34.56 0.1630035 Over 25 to 35 32 25 70 32 9.0 6 50 12 16.0 10 14 12 1.6 1.0 30 45.21 0.3230036 Over 35 to 45 40 32 85 42 11.0 8 63 16 20.0 12 18 16 40 50.28 0.6150037 Over 45 to 60 38 100 55 76 22 20 50 70.86 0.8490038 Over 60 to 80 50 45 120 70 13.0 10 95 22 26.0 14 28 25 1.6 70 94.50 1.4670039 Over 80 to 100 55 50 140 85 112 27 30.0 32 32 90 116.14 2.0807033-0040 Over 100 to 150 70 70 190 120 17.0 12 155 34 40.0 18 45 45 125 160.89 4.968
Dimensions for control
±0.02

________________
* The size is determined by the formula.

An example of a symbol for a reference prism for parts with a diameter of 5 to 10 mm:
Prism 7033-0031 GOST 12195-66
(Changed edition, Rev. N 1, 2).
2. Material - steel grade 20X according to GOST 4543-71. It is allowed to replace it with steel of other grades with mechanical properties not lower than those of steel grade 20X.
3. Hardness of working surfaces - 56...61 HRC. Cement h 0.8...1.2 mm.
3a. Support surfaces for fasteners - according to GOST 12876.
(Introduced additionally, Rev. N 1).
4. Unspecified prev. off sizes: H14, h14, .
(Changed edition, Rev. N 2).
5. (Cancelled, Rev. N 1).
6. Coating - Chem. Oks. prm. (coating designation - according to GOST 9.306).
(Changed edition, Rev. N 1).
7. Mark a batch of parts of the same standard size on containers or packaging indicating the symbol.
(Changed edition, Rev. N 2).
8. An example of the use of a reference prism is given in the appendix.
(Introduced additionally, Rev. N 2).
APPLICATION
Reference
REFERENCE PRISM APPLICATION EXAMPLE
The text of the document is verified by:
official publication
Machine tools. Details and knots.
GOST 12189-66 - GOST 12219-66.
Part one: Sat. GOSTs. -
M. : Publishing house of standards, 1992