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Notch broaching machine KRME
for notches for impact tests ASTM / DIN/EN
for weak / medium hard
metals, CFK-plastic, GFK-plastic
The conventional manufacturing of notch specimens for impact test is
very costly: the specimens have to be cut out with a milling machine or
plan
grinding machine.
Additional you have to insert the Notch with a high precision according
to the standards for notch specimens. For this you have to adjust the
specimens in longitudinal and vertical direction with a high precision.
Also you have to calculate the different thickness of the specimen much
easier is to do this by the notching machine KRME. Only insert the
milled specimen into the (adjustable) support of the machine and start
the stroke. The machine is designed to the notch and the remaining
“rest” will get a high precision ground of notch: 8 / 5 / 7 / 3 mm exact
(see table of accuracy) | |
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Why is this machine so effective?
The design of the working principle has a following layout: One side of
the specimen is clamped again the reference wall. The tooth of the
needle does have a fixed position to this reference clamping wall. It is
not necessary that the specimen will be positioned in high accuracy
(like milling tool) to the surface of the specimen. The remaining
distance between the reference wall (specimen surface) and the notch
ground will be every time at 8.0 mm. This distance is also 100 % correct
even when the dimensions of the specimens are not at 10 mm (thinner
material, wrong milling / grinding). |
With this machine, laboratories, material testing offices and
schools, universities vocational training school are able to make
low cost specimens (for didactic even only using square bars).
Broaches are in compliance with national and international standards
for steel and plastics. You may perform notches within 30 seconds
incl. inserting and removing without making use of any additional
tools. |
The power operated machine is located in a free standing housing.
The broach is drawn by a screw spindle with double guide pillar. The
drive is connected to an infinitely variable gear being adjusted by
a hand wheel between 0.35
- 2.06
m/min. Suitable guides provide for a centring feed. The work piece
location is provided with a metric calibration scale with a view to
a uniform
positioning of the specimens. The required notch depth can be set on
the machine with an adjustable metric scale-indicator. The lead
travels are stopped on both ends by limit switches. The machine is
operated by three keys: UP - DOWN - STOP.
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SIEMENS AG – KWU - test of ISO-V
specimens with broached notches
Except form a comparison form Siemens AG Kraftwerk Union
KWU
– notched specimens / milled specimens:
"The results of the impact tests with broached notched specimens
meet the results of specimens with milled notches with high
accuracy. The machine KRME is very appropriate to make specimens
according the dimensions and the requirements for standard ISO – V
specimens". |  |
KWU - comparing with notched specimens ISO-V
Test.-No. notch radius angle
depth of notch
mm Grad °
mm
reference 0,25
+ 0,025 45° + 2° 8.00
+ 0,1 mm
1 AEG
+
+
8.00 +
fulfilled
2 AEG
+
+
8.00 +
fulfilled
3 AEG
+
+
8.01 +
fulfilled
1 AES
+
+
8.02 +
fulfilled
2 AES
+
+
8.01 +
fulfilled
3 AES
+
+
7.99 +
fulfilled
1 AEW
+
+
8.01 +
fulfilled
2 AEW
+
+
8.02 +
fulfilled
3 AEW
+
+
8.01 +
fulfilled
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For high alloyed metals with higher tenacity at impact test we
recommend a notch tool with titanium coating:
This will serve a
essential higher endurance. Below shown values are approximate
number of sharpness life.
It will be diversify depending of your
material. The life time of sharpness couldn’t be guaranteed. A
essential
point of tool life is also to clean the tool
regular (each stroke; each 10 stroke...)
lubricating grease for notching tool: Jokisch A-P897
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Number of notched specimens up to new sharpening of needle |
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Material: |
Rm Mpa |
regular notching tool |
titanium coated notching tool |
ST52-3 N
42 CrMo4 V
34 CrNiMo 6V
VA (18/10)
1.4548
1.3901 (24-28% Ni)
1.4986 WK
titanium
plastic
glass fibre reinforced plastic
max.
tensile strength Rm |
490-630
750-860 |
6.500
specimens
4.000
specimens
3.000
specimens
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----
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no wear out
see titan notch tool
max. 1.300 MPa |
10.000
specimens
6.500
specimens
5.000
specimens
4.000
specimens
2.000
specimens
1.500
specimens
1.000
specimens
500
specimens
not required
4.000
specimens |
Technical data |
Machine type
specimens approximate
dimensions W/D/H ca. mm
needed space ca. mm
weight ca. kg
motor comp. LENZE
power
supply
on request other power supply |
: KRME 240
: 80
piece/ h.
: 500 / 310
/ 1.050
notching tool down /
1.290 (up)
: 800 / 600 / 1.400
: 90
: 0,55 kW, 2840-3450
Upm (variable), 120 hub/h.
: 400V / 50 Hz / ~
3 Phasen / 1,5 A / 16 A CEE-Stecker
: 220 – 240 V / 380
- 415 V / 50 Hz / 2,6 A / 1,5 A
220 – 277 V / 380 - 480 V / 60 Hz / 2,3 A / 1,3 A
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