BLACKS CHARPY / IZOD CUTTING & PREPARATION MACHINES

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CNB31-001A1 Fixed Speed Motorised Charpy Notch Machine
CNB34-001A1 Variable Speed Motorised Charpy Notch Machine
 

Our motorised broaching machine is a self-contained floor mounted unit, specially designed for cutting Charpy and Izod 'V' and 'U' notches in pre-machined standard 10mm square, sub-size and 0.45" diameter specimens.

The CNB-31 produces a consistent notch of superior quality to that produced by use of the milling process.

For a wider range of materials, the use of the variable speed CNB-34 is recommended.

CNB31-001A1 FIXED SPEED
MOTORISED CHARPY NOTCH MACHINE

Notches can be cut in carbon steels, easily machined low alloy steels, non-ferrous and plastic materials.

BROACHES
Broaches are ordered separately.
Charpy Broaches

MACHINE SPECIFICATION

PERFORMANCE

Broach cutting speed:

Fixed Machine: 27mm/s
Variable Machine: Infinitely variable
7.1 to 37.8mm/s

Production Rate:

Fixed Machine:
The time for the broach travel in each direction is 10 seconds. So allowing for loading/unloading & cleaning of the broach teeth an operational floor-to-floor time of 40 seconds can be achieved.

Variable Machine:
The time for the broach travel in the cut direction is between 7 & 37 seconds and the return time is 10 seconds. So allowing for loading/unloading & cleaning of the broach teeth an operational floor-to-floor time of 40 to 60 seconds can be achieved, which is dependant upon the sample material & speed the broach is set to cut.

ACCESSORIES

Broach Keep CNB20-004A2 “W”, for 10mm x 5.0/2.5 sub-size samples.

Clamp Block CNB20-009A3 & Clamp Pins CNB22-002A4, for round samples.

Multi-notch attachments :
A) 0.45” diameter and 10mm square multi notch attachment CNB32-003A1
or
B) 10mm square multi notch attachment CNB21-006A1

View Video for 0.45" Ø attachment

Standard Broaches
Special Broaches
Notch depth caliper go/no go gauges

Caliper Gauges

Charpy Specimen Milling Machine



The CNB-31 & CNB-34 Fixed & Variable Speed Motorised Charpy Notch Broaching Machines make an ideal accompaniment to our Fixed or Variable Speed Charpy Specimen Milling Machine to provide a compact solution allowing complete independence for the test house/laboratory to produce their own Charpy/Izod specimen.
More...

SPARES

Spare parts and consumables for all machines available.
Spare Parts...

SPECIMEN MATERIALS

By arrangement, special testing may be undertaken using our in house test facility to determine optimum equipment for difficult to machine materials.

Contact us, stating the specimen’s material, size & standard, for further guidance.

QUALITY

Each machine undergoes a full inspection, run-in period and test cycle prior to despatch.

CE marking: Approved by independent company.

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Charpy Notch Videos

CNB34-001A1 VARIABLE SPEED
MOTORISED CHARPY NOTCH MACHINE

The variable speed control allows adjustment of the broach cutting speed, so more difficult materials can be broached and to give extended broach life between sharpening.

Notches can be cut in carbon steels, more difficult to machine alloy steels, stainless steels, non-ferrous and plastic materials. The variable speed drive and our hard cut broaches allow a wider range of materials to be cut, including stainless steel or more difficult to machine alloy steels.

BROACHES
Broaches are ordered separately.
Charpy Broaches

'V' Notch Specimen

'U' Notch Specimen

 

  VIDEO
  MOTORISED MACHINE OPTIONS: 'U' Notch Specimens

 

  VIDEO
  MOTORISED MACHINE OPTIONS: 0.45" Diameter Specimens

Machine Design and Method of Operation

Machine Design:

The machine is simple to operate and of robust construction, with large removable panels to provide access for routine maintenance. The design of the machine provides a comfortable working height.

The cutting operation is achieved by drawing a specially designed multi-toothed broach across the specimen. The broach is drawn into the machine by precision twin lead screws via a geared mechanism to ensure the broach cuts perpendicular to the specimen clamp, limit switches are fitted for end of stroke travel.

The lead screws are matched with the travel nut to ensure minimum-operating clearances, while spring loaded safety guards ensure swarf and debris cannot enter into the lead screws and nuts.

Fixed Speed Drive:

Once the notch depth has been set and the specimen clamped in position, the machine operation is activated via lower and raise push- buttons. An additional stop button is fitted for emergency use.

The machine operation is controlled by the lower and raise push- buttons, which forward and reverse the machine motor, resulting in the broach cutting and return strokes being at a fixed speed. The motor has thermal overload protection to protect the drive mechanism.

Variable Speed Drive:

Once the notch depth has been set and the specimen clamped in position, the machine operation is activated via a lower and raise switch. A graduated knob controls the speed the broach cuts and the broach return speed is factory set at a constant fast speed. A  stop button is fitted for emergency use.

The motor is controlled via a variable speed, frequency converter thyristor drive and the pre-programmed P.L.C. ensures motor overload does not occur to protect the drive mechanism.

Guards:
The machine guards totally enclose the drive motor and operating mechanism.

A broach guard is fitted to comply with safety regulations; limit switches prevent motor operation when the guards are open.

 

Method of Operation:

A hand-operated clamp is mounted on the machine top plate at a comfortable working height and ensures that the specimen is held accurately and securely in position. It is fitted with adjusting screws and an end stop to ensure correct specimen positioning. A micro-adjustor provides manual adjustment for broach depth of cut and hence the final notch depth. Once set, the adjusting screws provide repeatability for the next specimen.

The clamp can accommodate 10mm square & 10mm x 7.5/6.7mm rectangular sub-size samples. For 10mm x 5.0/2.5mm rectangular sub-size samples a broach keep “W” is required and for circular specimens a different clamp block is required, see accessories.

The broach can easily be removed for re-sharpening or replaced to cut a different type of notch.

 

  VIDEO
  MOTORISED MACHINE OPTIONS: Sub-Size Specimens

The sample is secured in the machine by the clamp. A light coating of cutting oil (RTD recommended) is applied to the broach and the lower push-button/switch is operated which draws the broach through the specimen to produce an accurate notch profile. After the notch has been cut, the sample is removed, the broach raise push-button/switch operated, which raises the broach and the broach teeth are cleaned, ready for the next sample.

Multi-notch Attachment:

There are 2 options for multi-notch samples.
A) 0.45” diameter and 10mm square sample attachment.
B) 10mm square sample attachment only.

The multi-notch attachment allows for single and multiple notches to be produced in 10mm square and/or 0.45" diameter specimens. See accessories.

This option is normally fitted in our factory; it may be fitted at our customer’s works providing they have access to a fitter & a surface grinder or milling machine.

 

  VIDEO
  MOTORISED MACHINE OPTIONS: Multi Notch Specimens

Broaches:
Broaches can be supplied for standards BS, ISO, EN, ASTM and other International Standard notch profiles.
Due to the variety of broaches and notch configurations, broaches are ordered separately.

Special notch profile broaches may be supplied to order, send details for consideration.
For broach quotation, please specify: -
Notch type,
Depth of notch,
Applicable Standard
Material specification/ hardness Rc

More information on our BROACH PAGE
 

BLACKS CHARPY & IZOD notch machines - Hand-operated - Motorised - CNM Machine
Manufactured by RJW LTD
Unit A5, Chaucer Business Park, Watery Lane, Kemsing, Sevenoaks, Kent, TN15 6PW
Precision & Production Engineers