Broaching machine KRME notches the specimens within 25 seconds

inluding specimen loading

Speed up specimen preparation for noteched impact specimens

The conventional manufacturing of specimens for impact test according ISO148 (and other standards) need high precision adjusting of the specimen on the milling machine to receive high accuracy specimens inside the dimensional limits of the standards.

You have to adjust the height of the milling tool (to receive exact notch depth / ground of 8 mm) and also the direction of the milling (within 2° accuracy).

All this work of fine adjusting and positioning you do not need on the special notch broaching machine: Only insert the specimen, fix it with the quick clamping device and press START.

Using this specimen notching machine means sparing labour cost for time consumption adjusting and fine positioning of your specimens. Additional the precision is mostly better than the milling process because the machine is limited only for this job: The exactness is present every time: Ground depth (residual thickness after notching), the radius of notched ground, the angle of the V-notch, angle of alignment according to longitudinal specimen… (at least everything related to the positioning) is perfect any time.

Even when you are not preparing this specimen day by day in hundreds of lots (with a milling machine used only for this process) this machine is a must: Suitable to notch up to 100 specimens per hour. The machine can be operated also from people those have no experience ins using milling machines. So this machine is the no. one solution for third party labs and all companies for up to 100 specimens per day to limit the labour cost for specimen production.

The machine can be used for to produce notched impact specimens for didactic: Just cut a square bar into pieces of 55 mm length (by using a simple saw) and insert these into the machine. 30 seconds later you have produces the ready to test sample (possible also by a student …).

One big advantage of this machine is: Pre adjusting of the notch process grants the residual thickness of 8.00 mm + 0,05) even if the specimen do have a thickness outside the limit (10,0 mm + 0,075) The result of the residual cross-section is every time 8.00 to 10.0 mm = 80 mm² 

There is no need to position the specimen with high accuracy: Only insert and fix the specimen an press START

The machine cuts notches (V / U – notches) within 30 sec. (steel) or 15 sec. (plastic) incl. loading-

The machine is mounted inside of a free standing housing. The notch braoching tool is guided by two guiding column and driven by a central spindle. The speed can be adjusted using a stepless gear box (for adjusting different speeds for different hard materials). The machine will be operated by two keys only (UP / DOWN). The electric limit switches are controlling the position. A setup can be done easily by user (no dedicated training required). 

 

Machine type

: KRME 240 (240 mm broaching tool)

specimen approximate

: 100 pieces / hour

dimensions of width / depth / height (mm)

: 500 / 310 / 1.050 broaching tool down / 1.290 aching tool up

maximum hardness of specimens

: < 40 HRC (higher tensile strength not possible because tooth of tool will wear / brake

Space for machine approximate mm

: 800 / 600 / 1.400

Weight approximate kg

: 90

motor company LENZE (speed adjustable)

: 0,55 kW, 2.840 – 3.450 RPM, 120 strokes per hour

Standard power supply

: 400V / 50 Hz / ~ 3 phase / 1,5 A / 16 A CEE-plug

Other power supply

: on request - without problems

Video notch broaching machine KRME

notch broaching tool (titanium coating) + notched specimens

Specimen dimensions according ISO148

 

Excerpt from comparing analysis by Siemens AG

KWU - Kraft Werk Union: Comparing research between milled and broached ISO-V specimens

"The results of charpy impact tests samples with broached notch (notch impact energy, toughness and the characteristics of the instrumented test) are inside the limits of the standard. The notch broaching machine KRME is suitable for to produce notches for ISO148".

 

SIEMENS AG

notch radius

notch angle

hgiht in ground

remark

Test-no.

Tolerance

0,25 +/- 0,025

45° +/- 2°

8,0 mm +/- 0,075

 

1

+

+

8,00

inside tolerance

2

+

+

8,01

inside tolerance

3

+

+

8,02

inside tolerance

4

+

+

8,01

inside tolerance

5

+

+

7,99

inside tolerance

6

+

+

8,01

inside tolerance

7

+

+

8,02

inside tolerance

8

+

+

8,01

inside tolerance

9

+

+

8,02

inside tolerance

 

 

Number of samples to be prepared before sharpening / replacement of the broach

For high alloyed metals with higher toughness of impact resistance we recommend a notch tool with titanium coating: This will serve an essential higher endurance. Below shown values is 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 to clean it regular (each stroke; 10 strokes ...).

The hardness of the material should not exceed the 40HRC Rockwell. If this material )<40HRC) hast to be notched we strongly recommend a special notching tool with titanium coating. Even if a coated notching tool will be used: At this hardness the wear will decrease the sharpness soon.

Notching broaching tools are wearing parts. A warranty to this is generally excluded. This especially as incorrect operation can-not be excluded: After each broaching the broaching tool has to be cleaned from broaching chips (brass brush) because residual chips in broach cause the flush teeth break off (not repairable tool).

Specimen made of

Tensile strength Rm MPa

Standard-notching tool

Titanium coated notching tool

ST52-3 N

490 - 630

6.500 specimens

10.000 specimens

42 CrMo4 V

750 - 860

4.000 specimens

6.500 specimens

34 CrNiMo 6V

1.000 – 1.400

3.000 specimens

5.000 specimens

VA (18/10)

700 – 1.300

xxx

4.000 specimens

1.4548

1.200

xxx

2.000 specimens

1.3901 (24-28% Ni)

 

xxx

1.500 specimens

1.4986 WK

650 - 850

xxx

1.000 specimens

Titanium

 

xxx

500 specimens

plastic

 

no wear out

not required