DIN82 knurling standard and other embossing styles
Note: The following standard is not strictly DIN82 standard, our company has modified some parameters (including rotation angle, tooth pitch, tooth angle) to fit our products, other companies should be careful when referring to DIN82 standard and actual production needs.
DIN82-73 standard is a German dimensional reference standard on knurling and embossing promulgated in 1973. The standard is mainly applied to fasteners, mechanical parts of the surface knurling processing. Product production process using knurling wheel processing of the production pattern, such as straight, twill embossing reference to this standard.
1. Knurling type (all units below are MM).
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Type |
Name & Representative |
Knurling rolling manufacturing method according to DIN 403 |
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RAA |
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RBL |
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RBR |
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RGE |
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RGV |
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RKE |
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RKV |
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2. Size
2.1. Tooth angle.
Tooth angle α=90°. Default is α=90° when no tooth angle is marked.
If required, the knurling can be made with 105° or other angular tooth angles. Examples of names in this case are
Description example 1: left/right knurling, tip projection (RGE type), tooth pitch t = 0.8 mm (08), tooth angle α = 105° (105).
Marking example 1: RGE 08-105 DIN 82.
Description example 2: straight knurling, straight groove type (RAA type), tooth pitch t = 0.6 mm (06), tooth angle α = 90° (90).
Labeling example 2: RAA06 DIN 82 (90 can be omitted).
Description example 3: straight knurling, straight groove type (RAA type), tooth pitch t = 1.2 mm (12), tooth angle α = 60° (60).
Marking example 3: RAA12-60DIN82.
2.2. tooth pitch t (pay attention to the lecture, here is the focus).
In order to refine the number of embossing wheels for manufacturing knurling, the knurled tooth pitch t is limited to the following nominal values, respectively.
0.3 0.5 0.6 (0.7) 0.8 (0.9) 1.0 1.2 1.6 mm
2.3. nominal diameter d1
The nominal diameter d1 of the shop construction drawing is the outer diameter of the finished knurling, and this diameter is the basis for the design.
2.4. Initial diameter d2
The initial diameter d2 of the workpiece before knurling must be smaller than the nominal diameter d1. This is because the material displacement during the embossing process increases the initial diameter.
The initial diameter d2 of the knurling for a tooth angle α = 105° can be calculated according to the knurling type and tooth pitch size according to the formula in the table below.
The factors in the formula do not take into account the rounding of the grooves caused by the embossing operation or the special characteristics of the material used for knurling.
|
Knurling type |
Initial diameter d2≈ |
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RAA rolls parallel to the groove of the shaft |
d1-0.5t |
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RBL left knurling |
d1-0.5t |
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RBR right knurling |
d1-0.5t |
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RGE left/right knurling with raised drill bit |
d1-0.67t |
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RGV left/right knurling, drill indent |
d1-0.33t |
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RKE cross knurling with raised drill bit |
d1-0.67t |
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RKV cross knurling, drill indentation |
d1-0.33t |
3. Reference standard
DIN 403 Knurling
DIN 8583 Table 5 Compression molding production method; embossing, classification, definition.
Description.
Compared to the 1940 version of DIN 82, the standard name “knurling” refers to all types. Since the former names “diamond knurling” and “non-diamond knurling” are no longer.
Have been used, which has caused difficulties in tool selection. Some types of knurling tools have shorter names, such as: left knurling tool, right knurling tool, left/right knurling tool.
The alphabetic symbols for the various types of knurling tools provide a better way to distinguish between them and also produce prescribed names for electronic data processing. The letter R distinguishes between knurling and embossing rollers (see DIN 403), the second letter (A,B,G and K) indicates the basic type, and the third letter (A-parallel to the shaft, L-left knurling, R-right knurling, E-raised, V-indented) indicates the groove direction and shape.
The rotation angle (β) of BR, BL, GE and GV is a fixed standard value of 30° and is marked as default (i.e. not marked when β=30°), but if needed, the rotation angle can be 45° or other angle values, this special case needs to be stated in the name, e.g.
Description example: Left oblique knurling (RBL), tooth pitch t=1.2mm (12), rotation angle β=45°.
Labeling example: RBL12*45°.
The tooth angle is usually α = 90°, however, if necessary, the knurled tooth pitch angle may be α = 105° or other angle values, this special case must be marked in the name, as in the example in 2.1 above.
Note that the rotation angle β is not the same concept as the tooth angle α. The difference in the labeling method is:
- RBL08*45° represents β=45° (α is the default value, i.e. α=90°)
- RBL08-45 stands for α=45° (β is the default value, i.e. β=30°)
- RBL08*45°-105 represents rotation angle β=45° and tooth angle α=105°
The tooth pitch t = 2 mm has been discontinued, as this data is rarely used in practice. Similarly, no attempt has been made to correlate tooth pitch with workpiece diameter, and the previous recommendations have not proven to be applicable to all application ranges, so practice has adopted limited recommendations.
The formula for calculating the initial diameter of the workpiece is given, which depends on the type of knurling and the outer diameter of the finished knurling (equivalent to the nominal diameter). Without taking into account the special characteristics of the material.
The results obtained from this formula are intended as a reference value only.
To facilitate the selection of embossing rollers according to DIN 403, manufacturing methods suitable for all types of knurling have been indicated.
4. Some examples.
RAA10:
RAA16
RAA10:
RAA06 and RGE08 (note this is the raised diamond pattern):
Head RAA06 and rod RGV06 (note this is the tip indented diamond pattern):
RBR12 and RBL12.
RAA1.0:
This is a set of embossed wheels.
Embossing wheel fixed to the tool holder.
Larger parts are more often used with a knurling machine + knurling wheel (knurling wheel), see the following video.
