2024年3月12日发(作者：左丘觅荷)

Type F undercuts are to be used on workpieces with surfaces which are perpendicular to each other, intended for subsequent machining.

z Machining allowance d 1

Workpiece diameter

Figure 2:Undercut for workpieces with shoulder and a cylindrical surface intended

for subsequent machining

-B e u t h -G K N W a l t e r s c h e i d G e t r i e b e G m b H -K d N r .3354738-L f N r .2853109001-2005-06-23 16:00

Page 3

DIN 509:1998-06

4.3Type G

Type G undercuts are to be used on workpieces not subjected to substantial fatigue stresses in service and thus require an undercut with a small included angle.

z Machining allowance d 1

Workpiece diameter

Figure 3:Undercut with a smaller transition

4.4Type H

Type H undercuts are to be used on workpieces similar to those specified for type F (but with a greater included angle).

z Machining allowance d 1

Workpiece diameter

Figure 4:Undercut with a larger transition

5Surface roughness

The roughness of undercut surfaces shall be such that the arithmetical mean deviation of the profile, R a , is 3,2m m and the maximum two point height of the profile, R max *), is 25m m. Any other

surface roughness param-eters shall be subject to agreement.

6Designation

Designation of a type E undercut, with a radius, r , of 0,8 mm and a depth, t 1, of 0,3 mm:

Undercut DIN 509 – E 0,8 * 0,3

Designation of a type E undercut, with a radius, r , of 0,8 mm, a depth, t 1, of 0,3 mm, and with R a = 1,6 m m and R max = 16 m m:

Undercut DIN 509 – E 0,8 * 0,3 – R a 1,6 – R max 16

-B e u t h -G K N W a l t e r s c h e i d G e t r i e b e G m b H -K d N r .3354738-L f N r .2853109001-2005-06-23 16:00

Page 4

DIN 509:1998-06

Table 1:Undercut dimensions

Type

Series 1Series 2

Corresponding diameter d 12) for

workpieces

subjected to a normal stress concentration subjected to higher fatigue loads t

and

and

and

and

Over 1,6 up to 3over 3 up to 18over 10 up to 18

over 18 up to 80

Over 18 up to 50

over 18 up to 50

over 18 up to 50over 50 up to 80

over 80 up to 125

over 125

over 80

over 80

1)

Undercuts with series 1 radii as specified in DIN 250 are to be given preference. For types G and H, the radii

conform to those specified for indexable hardmetal inserts as in DIN 4967, DIN 4768 and DIN 4769-1.

2) Components with a short shoulder and thin-walled components are excepted. When a workpiece has different diameters, it may be convenient for manufacturing reasons to use the same form and

size of undercut at several

points.

1)-B e u t h -G K N W a l t e r s c h e i d G e t r i e b e G m b H -K d N r .3354738-L f N r .2853109001-2005-06-23 16:00

Page 5

DIN 509:1998-06

8Counterbores on mating part

Figure 6:Counterbores on mating part Table 3:Determination of dimension a

Table 2:Machining allowance

Type H

Minimum size of a for type

Undercut size, r *t 1

-B e u t h -G K N W a l t e r s c h e i d G e t r i e b e G m b H -K d N r .3354738-L f N r .2853109001-2005-06-23 16:00

Page 6

DIN 509:1998-06

9Indications on drawings

On technical drawings, undercuts may either be shown in detail, giving all dimensions, or schematically, giving only the E: Undercut F 1,2 * 0,2Undercut F 1,2 * 0,22

Figure 7:Complete indication for F 1,2 * 0,2

undercut

Figure 8:Complete indication for E 1,2 * 0,2

undercut

Detail X

Figure 9:Simplified indication for F 1,2 * 0,2

undercut Figure 10:Simplified indication for E 1,2 * 0,2

undercut

Detail

Y

Explanatory notes

Forms and dimensions of types G and H undercuts conform to those for indexable inserts as specified in DIN 4967-1 and DIN 4969-1 or as in DIN 4967, DIN 4968 or DIN 4969-1. For economic reasons,

it is recom-mended that undercuts should be produced using these inserts.

R a

R a R max

R max

-B e u t h -G K N W a l t e r s c h e i d G e t r i e b e G m b H -K d N r .3354738-L f N r .2853109001-2005-06-23 16:00

2024年3月12日发(作者：左丘觅荷)

Type F undercuts are to be used on workpieces with surfaces which are perpendicular to each other, intended for subsequent machining.

z Machining allowance d 1

Workpiece diameter

Figure 2:Undercut for workpieces with shoulder and a cylindrical surface intended

for subsequent machining

-B e u t h -G K N W a l t e r s c h e i d G e t r i e b e G m b H -K d N r .3354738-L f N r .2853109001-2005-06-23 16:00

Page 3

DIN 509:1998-06

4.3Type G

Type G undercuts are to be used on workpieces not subjected to substantial fatigue stresses in service and thus require an undercut with a small included angle.

z Machining allowance d 1

Workpiece diameter

Figure 3:Undercut with a smaller transition

4.4Type H

Type H undercuts are to be used on workpieces similar to those specified for type F (but with a greater included angle).

z Machining allowance d 1

Workpiece diameter

Figure 4:Undercut with a larger transition

5Surface roughness

The roughness of undercut surfaces shall be such that the arithmetical mean deviation of the profile, R a , is 3,2m m and the maximum two point height of the profile, R max *), is 25m m. Any other

surface roughness param-eters shall be subject to agreement.

6Designation

Designation of a type E undercut, with a radius, r , of 0,8 mm and a depth, t 1, of 0,3 mm:

Undercut DIN 509 – E 0,8 * 0,3

Designation of a type E undercut, with a radius, r , of 0,8 mm, a depth, t 1, of 0,3 mm, and with R a = 1,6 m m and R max = 16 m m:

Undercut DIN 509 – E 0,8 * 0,3 – R a 1,6 – R max 16

-B e u t h -G K N W a l t e r s c h e i d G e t r i e b e G m b H -K d N r .3354738-L f N r .2853109001-2005-06-23 16:00

Page 4

DIN 509:1998-06

Table 1:Undercut dimensions

Type

Series 1Series 2

Corresponding diameter d 12) for

workpieces

subjected to a normal stress concentration subjected to higher fatigue loads t

and

and

and

and

Over 1,6 up to 3over 3 up to 18over 10 up to 18

over 18 up to 80

Over 18 up to 50

over 18 up to 50

over 18 up to 50over 50 up to 80

over 80 up to 125

over 125

over 80

over 80

1)

Undercuts with series 1 radii as specified in DIN 250 are to be given preference. For types G and H, the radii

conform to those specified for indexable hardmetal inserts as in DIN 4967, DIN 4768 and DIN 4769-1.

2) Components with a short shoulder and thin-walled components are excepted. When a workpiece has different diameters, it may be convenient for manufacturing reasons to use the same form and

size of undercut at several

points.

1)-B e u t h -G K N W a l t e r s c h e i d G e t r i e b e G m b H -K d N r .3354738-L f N r .2853109001-2005-06-23 16:00

Page 5

DIN 509:1998-06

8Counterbores on mating part

Figure 6:Counterbores on mating part Table 3:Determination of dimension a

Table 2:Machining allowance

Type H

Minimum size of a for type

Undercut size, r *t 1

-B e u t h -G K N W a l t e r s c h e i d G e t r i e b e G m b H -K d N r .3354738-L f N r .2853109001-2005-06-23 16:00

Page 6

DIN 509:1998-06

9Indications on drawings

On technical drawings, undercuts may either be shown in detail, giving all dimensions, or schematically, giving only the E: Undercut F 1,2 * 0,2Undercut F 1,2 * 0,22

Figure 7:Complete indication for F 1,2 * 0,2

undercut

Figure 8:Complete indication for E 1,2 * 0,2

undercut

Detail X

Figure 9:Simplified indication for F 1,2 * 0,2

undercut Figure 10:Simplified indication for E 1,2 * 0,2

undercut

Detail

Y

Explanatory notes

Forms and dimensions of types G and H undercuts conform to those for indexable inserts as specified in DIN 4967-1 and DIN 4969-1 or as in DIN 4967, DIN 4968 or DIN 4969-1. For economic reasons,

it is recom-mended that undercuts should be produced using these inserts.

R a

R a R max

R max

-B e u t h -G K N W a l t e r s c h e i d G e t r i e b e G m b H -K d N r .3354738-L f N r .2853109001-2005-06-23 16:00