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close this bookCutting by Milling - Course: Techniques for Machining of Material. Instruction Examples for Practical Vocational Training
View the document(introduction...)
View the documentIntroduction
View the documentInstruction example 6.1.: Backing material
View the documentInstruction example 6.2.: Measuring point
View the documentInstruction example 6.3.: Fixing bush
View the documentInstruction example 6.4.: Segment

Instruction example 6.3.: Fixing bush

A bush-shaped workpiece made of grey cast iron has to be separated (slotted) with a metal slitting saw blade half way of its bore.

Material

GGL 25 (grey cast iron with laminated graphite, tensile strength 250 MPa, compressive strength 1000 MPa)


Figure

Dimensions

Ø 40 x Ø 80 x 120 mm

Milling machine

Horizontal milling machine

Tools

Metal slitting saw blade (Ø 125 - 150 x 2.5 mm), long cutter arbor, machine vice, clamping intake, chucking screws, keys

Measuring and testing means

Vernier caliper, steel square

Auxiliaries

Stop rack, chip brush, hand broom, cleaning rag, T-slot cleaner, tongues for the machine vice

Required previous knowledge

To read a drawing, to measure and to test, to set-up and to operate horizontal milling machines

Sequence of operations

Remarks



1. Batch-quantity and visual control of the supplied workpieces

Comparison with the specifications of the work accompanying data sheets



2. Functional test and lubrication of the milling machine

Lubrication and oil-level check according to the lubrication schedule



3. Fixing and adjusting the machine vice (along the machine table)

The adjustment and localization is done by means of the tongues and steel squares



4. Fastening the cutter arbor (long) and fixing the metal slitting saw blade

Do not forget the feather key!



5. Setting-up the milling protective system

Pay attention to the space between the milling protective device and the upper edge of the workpiece!



6. Clamping in and adjusting the workpiece according to the marking (separating slot)

The adjustment should be carried out with a steel square on a slightly fastened workpiece. A side stop secures the concentricity of the separating slot.



7. Fixing the cutting values



8. Position the milling table into the working position

Place the metal slitting saw blade manually on the marking of the separation slot.



9. Cutting by milling of the fixing bush (semi-sided cutting)

Observation of the metal slitting saw blade during cutting by milling on "standstill".



10. Declamp and clean the work-piece

The clamping out of the workpiece should be carried out before the return stroke of the milling table.



11. Visual control of the work-piece

Control if the separating slot is situated at the marked point (marking).



12. Continuation of cutting by milling until all fixing bushes are slotted

With a large number of pieces the metal slitting saw blade should be changed in time.


Fixing bush