Notch broaching machines + impact bending specimens ISO148 or ISO179
Precise notch ISO 148 + ASTM E23
- notch clearance <20 seconds
- Sample change <5 seconds+
- 230V plug (not 400V)
- Stepless clearing speed
MKF Metal Kerb Milling Machine 36 Samples
- Precision notching and cutting machine
- 36 Notch and separate samples
- milling cycle <60 seconds
- Magnetic clamp for quick loading
Plastic Notch Milling Machine Charpy
- Automatic milling cycle >60sec.
- 20 perfectly notched impact specimens
- milling spindle UPM 24.0000
- 4-way milling cutter <1600 cuts per second
KRME notch clearing machine for impact tests
German quality at the best price
Save yourself the time-consuming task of aligning the impact test specimens on your milling machine: With this machine, inserting and first clearing only takes 3 seconds and you don't have to pay attention to the milling angle or milling depth!
Video notch clearing machine KRME for impact bending specimens
notching without setup time
Insert sample, clamp, start: <3 seconds
The decisive advantage is that the time-consuming, precise alignment of the impact test specimen before the machining process is no longer necessary. The broaching machine is always ready to start without the need for laborious positioning of the specimen. This makes notching as quick and easy as Notched bar impact test itself. The national and international standards for the notched bar impact test according to ISO148 / ASTM E23 describe not only the notched bar impact test but also the requirements for the notched bar impact specimens. These must be manufactured within narrow tolerances (see drawing below). The manufacture of the square specimen with dimensions 10 x 10 x 55 mm is the simplest production step. The introduction of the notch within the narrow tolerances is much more critical.
Because: The results of the impact test can only be as accurate as the quality of the test specimen allows; an inaccurately manufactured test specimen will inevitably lead to falsified results. The contour of the sample can be produced using normal machining technology. However, attention must be paid to the quality of the surface: the contact surfaces of the sample are pulled along the edges of the abutment with high pressure. If these contact surfaces are too rough, this can affect the result. In addition, rough surfaces wear out these important edges of the abutment more quickly. The notch must be made within the tolerances specified in the drawing. The notch must be made taking the following requirements into account
- exact notch depth or sample width 8+0,075mm
- Notch centering (very important for lateral centering)
- notch direction to the sample axis
- notch rotation
- notch radius (tool wear on milling cutters)
- compliance with surface roughness
The notch can be created in seconds using broaching technology
No alignment work: insert, clamp, start – <30 for sample with highest accuracy
If a milling machine is not permanently reserved for the production of notched bar impact bending specimens (100% utilization exclusively for notched bar impact bending specimens), the problem begins: Each time, the specimen must be positioned extremely precisely and the clamping carried out extremely precisely: 10 minutes can quickly pass without processing having started. A notch can be made much more quickly and therefore more cost-effectively using the notch clearing machine described here. In addition, a higher notch accuracy is generally achieved. Especially when hundreds of specimens do not have to be produced (which are then processed in batches on a milling machine at the same time), the notch clearing machine is THE alternative. It is particularly popular with service providers in material testing, since it is precisely here that cost-effective yet precise sample production is important. With the KRME, notches can be made by anyone (without prior knowledge of machining) in the laboratories of industrial companies + materials laboratories. Also for training purposes at universities, technical colleges and vocational schools, suitable samples for didactic purposes can be produced very cost-effectively from, for example, standard square material 10 x 10 mm.
Trick: It is not the notch depth that is important, but the remaining 8 mm
With the notch broaching machine shown, the effort is reduced to a minimum, as the notch to be made is fundamentally independent of the sample thickness. With the machine, the distance to the broaching needle is set using a gauge block so that the remaining sample cross-section corresponds exactly to the standard. Why is this machine so efficient?
The functional principle is designed so that the reference size for the notch base is always 8 mm (V-notch 2 mm). Even if the sample is 9,5 mm thick (undersize / manufacturing tolerances), 8,0 mm always remains in the notch base. The distance from the notch base to where the sample is placed on the sample holder is therefore precisely set. The broach is always the correct distance from this wall - regardless of the sample size.
No adjustment is required for the exact insertion of the notch (notch depth)! Insert sample, close quick release, start
Machine data
| Machine Type | KRME 2 – 240 (Electric notch broaching machine with broach needle 240 mm) |
| Approximate number of samples | up to 100 samples / hour |
| Maximum hardness when clearing | <40 HRC (no higher hardness, as broach teeth will be damaged / worn / break off) |
| Dimensions width / depth / height approx. | 50 / 31 / 105 cm broach bottom / 1.290 top |
| Approximate space requirements | 80 / 60 / 1.40 cm |
| Weight approx. | 90 kg |
| motor with frequency converter | 0,55kW/2,84A – 3.450 rpm, 120 strokes/hour – Adjustable speed depending on the material |
| standard power connection / option | 220V/50Hz / 1 Phase / 1.5 A / 220V plug / others on request |
Sample dimensions / sample dimensions of impact bending specimens according to ISO 148 + ASTM E23
Do you need to check and document the dimensions of your impact bending specimens?
Then this is USB microscope just right for you.
Extract from comparative tests SIEMENS AG
KWU – Kraft Werks Union – Comparative study of milled / cleared ISO-V samples
"The results of the notch impact tests on samples with a cleared notch (notch impact energy, ductile fracture fraction and the parameters of the instrumented test) agree well with the results of the samples with a milled notch. Notch clearing machines are well suited to producing standard-compliant notches on ISO-V samples."
| Siemens AG Test No. | notch radius 0,25 +/- 0,025 | notch angle 45° +/- 2° | Width 8,0 mm +/- 0,075 | Remark |
| 1 | + | + | 8,00 | within tolerance |
| 2 | + | + | 8,01 | within tolerance |
| 3 | + | + | 8,02 | within tolerance |
| 4 | + | + | 8,01 | within tolerance |
| 5 | + | + | 7,99 | within tolerance |
| 6 | + | + | 8,01 | within tolerance |
| 7 | + | + | 8,02 | within tolerance |
| 8 | + | + | 8,01 | within tolerance |
| 9 | + | + | 8,02 | within tolerance |
Number of clearances until sharpening / replacement
For high-strength alloys (high impact strength), the use of titanium-coated broaches is required. The service life for broaches given below is an approximate guideline, as the steel types can vary greatly due to alloy components. The service life cannot be guaranteed.
The hardness of the material should not exceed 40 HRC. At this hardness, a titanium coating of the broach is strongly recommended. Despite this coating, at this high hardness, it must be expected that the service life (sharpness) only allows a small number of broaching operations before resharpening.
Broaches are wearing parts. A guarantee for these is generally excluded as we cannot prevent incorrect operation: After EVERY broaching process, the broaching tool must be thoroughly cleaned of chips (brass brush), as chips remaining in the broaching tool will cause the broaching teeth to break (non-repairable tool).
| Sample material | Tensile strength | Samples Broach Standard | Samples broach TIN coating |
| ST52-3 N | 490 – 630 | 6.500 | 10.000 |
| 42 CrMo4 V | 750 – 860 | 4.000 | 6.500 |
| 34 CrNiMo 6V | 1.000 – 1.400 | 3.000 | 5.000 |
| VA (18/10) | 700 – 1.300 | 4.000 | |
| 1.4548 | <1200 | 2.000 | |
| 1.3901 (24-28% Ni) | 1.500 | ||
| 1.4986 World Cup | 650 – 850 | 1.000 | |
| Titanium | 500 | ||
| Plastic | not necessary | not necessary |
MKF metal notch milling machine for efficient notch milling and simultaneous separation
Notch + separate (or segment) 36 impact specimens (12 bars) in under 60 seconds
Your sample volume for impact bending specimens ISO 148 / ASTM is >30 sets (90 samples) per day?
Then we should switch to rational production!
The production of bars for impact bending tests is relatively simple: The required bars (3 impact bending specimens per bar) are machined from the raw material. Depending on the quality of the milling, these must be ground on a surface grinding machine to the dimensional accuracy and roughness (<148RA) required by ISO 5.
- Thickness / height in impact direction: 10 +0,110 mm
- Width: 1 +0,075 mm
- Roughness: <5 µm (without end faces)
The samples are not yet separated and 3 samples form a rod with a length of at least 170 mm (up to approx. 200 mm).
Clamp up to 12 bars in the sample magazine (magnetic clamp with additional side clamping). The thickness (height) of the sample must comply with the standard. The width (e.g. sheet thickness) may be smaller than the nominal size (reduced cross-section). The cycle is started and after just 1 minute perfectly milled notches are achieved. At the same time, the sample is divided into 3 impact bending specimens and a residual piece.
Alternatively, a disc milling cutter with a smaller diameter can be used instead of the cutting cutter. In this case, the samples are not separated, but a residual web remains. In this case, the individual samples are broken immediately before testing.
Video MKF Metal Notch Milling Notch Impact Bend Specimens ISO 148 / ASTM
High-performance metal notching milling machine MKF
Newly developed in 2023 - for the efficient, simultaneous milling of the notches and the separation (or sectioning) of a test bar for 3 notch impact bending specimens of 55 mm each (Charpy / Izod). The test bars are fixed on the moving table using a magnetic clamp and clamping screws. 12 test bars with a length of approx. 170mm can be clamped at the same time. After closing the safety hood / starting, the moving table moves the clamping table with the clamped samples under the extremely stable high-speed milling shaft. The entire milling cycle with simultaneous notch milling and separation into individual samples takes only approx. 30 - 180 seconds (depending on the material) (including return to the starting position). It is extremely simple to operate and can be carried out by anyone.
Highlights
- Extremely stable frame with height adjustment via spindle and spindle fixation
- Powder-coated enclosure
- Base frame coated with special oil chamber paint (oil emulsion resistance)
- Very solid milling spindle with excellent bearings, extremely rigid C-shaped frame
- Oversized milling spindle drive motor: 5,5 kW for speeds: 190 – 465 rpm
- Cutting speed of notching cutter 38 – 92 m/second
- Cutting speed Separation cut 48 – 117 m/second
- Travel cut with precision linear guides with wipers and roller blind covers
- Drive power feed: 0,37kW (gearbox 1:26) for milling feed: 260 – 645 mm/min.
- Total power in average milling operation approx.: 4 KW
- Cycle duration approximately between 30 – 180 seconds, depending on the material
- Emulsion cooling of the milling cutters using a circulation cooling system
- Integrated coolant tank 60 L with coarse filter, chamber filter, circulation pump
- Optional chip collector magnet available
- Clamping device for 12 test bars with 3 samples each = 36 impact bending samples per cycle
- Speed and feed programmable via display
- 60 liter tank on wheels with drain valve, lid, coarse filter, chamber filter, circulation pump
Ready-to-use delivery included
– Separating cutter (saw cut for separation) made of hard metal, diameter 80 x 1 mm (or segmenting cutter for residual section 2 mm
– Contour/notch cutter for V-notch 45 degrees, made of carbide, diameter 63 x 2 mm
– Water-based lubricating emulsion (environmentally friendly), can be disposed of via dirty water
– Dimensions / weight approx.: 1180 x 700 x 1680 mm / approx.: 1150 Kg
– Connection 400V/50Hz 16A plug
The machine is bolted to an extremely solid base. This base houses a 60-liter circulating cooling system. The height adjustment (once during setup) is guided by a very solid graphite self-lubricating linear guide. The feed spindle is protected against splash water and milling chips by a dirt roller blind. The control system is installed in a separate electrical box.
Once the machine has been set up, it is extremely easy to operate:
- Open the protective cover
- Unclamp and remove samples from the previous cycle
- Clean the holder from the previous milling process (blow out chips)
- Insert new test rods to the stop and tighten using magnetic clamps and clamping screws
- Close the protective cover
- If necessary, change the milling speed or feed speed, press Start
- Wait 30 – 180 seconds…
Plastic Notch Milling Notch Impact Bend Specimens ISO 179 / 180
KKF precision for exact results
For the efficient production of precise notches on impact bending specimens ISO179 / 180 ua We are the manufacturer of this machine and look forward to your inquiry. The conventional production of samples for impact bending tests involves considerable effort. For example, the samples prepared by injection molding, planing or milling must be inserted into a milling machine in a conventional, precise and therefore time-consuming way in order to mill the notch and the milling cutter must be positioned.
It's different with the KKF: Here, the preparatory test bars are clamped into a device in a matter of seconds and the start button is pressed. A sample holder that corresponds exactly to the impact bending test ensures that the notch is made in the middle. A stack of 20 samples is clamped into a vice and the milling process can begin immediately.
For other sample shapes, individual sample holders can be designed to meet your needs.
Carrying out the notching work / using the machine:
- Main switch – electronics boots approx. 20 seconds
- Insert test rods, clamp, close protective cover
- Press START: Milling cycle starts (feed and automatic repositioning)
- Take samples, clamp next batch
The milling area is protected from inadvertent access by the operator by a locking protective housing - there is no danger to persons. During the milling process, a 220V socket is connected and an industrial vacuum cleaner is started to collect the milling chips.
German precision machine with extremely fast milling spindle and 4-way milling cutter ensure an extremely good cutting pattern: The roughness of the notch is extremely low and thus the results of your impact bending test increase to the true values without premature breakage.
KKF plastic notch milling machine ISO 179
Machine description plastic notch milling machine KKF
The plastic notch milling machine KKF is equipped with an extremely fast rotating precision spindle. A disc milling machine with V-notch milling cutters is mounted on this. The combination of the high speed and 4 milling blades ensures that milling is carried out extremely quickly. This means that each chip is only a few thousandths of a mm thick and is removed without compressing the sample material (no compaction or crushing = no damage). The roughness of the milling is extremely low. This ensures that the results of the notch impact bending test are generally higher than for samples produced with simple, usually hand-operated, very slow-working hand crank milling machines/planers.
The transversely clamped impact tests are carried out under the rotating disc milling cutter using a sample clamp (clamping device) that is mounted on a travel carriage. The machine can be described as a reference machine: The German market leader in the plastics sector had this machine (or its predecessor) specially developed by us and purchased it for all of its plants worldwide.
The speed of the disc milling cutter and the feed rate can be adjusted continuously. The notch depth is set via the height adjustment and then fixed. The machine complies with CE safety requirements and is equipped with a protective housing that is locked during milling. The very small, extremely light chips are collected during operation by a powerful industrial suction system.
Highlights
- Table machine with heavy, low-vibration machine body
- Backward-tilted structure for easy insertion of samples
- Sample holder for 20 pieces of impact specimens (plastic)
- Disc milling cutter with 4 carbide coated cutting edges, shaft diameter 6 mm, milling cutter diameter cutting range 12 mm
- Air-cooled high-frequency milling spindle 2,2 kW, speed 5000 – 24000 rpm
- speed control using a frequency converter
- Slide feed with 3Nm torque, max. feed 12.000 mm/min
- Duration of milling / return travel (total cycle) approx. 5 – 25 seconds
- Spindle speed and milling feed infinitely adjustable
- Polycarbonate debris hood, locked during operation
- cutter blade cover with vacuum cleaner connection nozzle
- Weight: open approx. 100 kg
Service
- Clamp up to 20 samples and close the protective housing (locks automatically)
- Start: carriage moves to the left, notches are milled, carriage moves back
- Milling spindle stops, door unlocked, samples taken
