Carbide Punches

precision carbide punches

Carbide punches are one kind of mold parts, which are the vital parts of the stamping tools, meanwhile, they’re the consumable parts that need to be replaced after working for some time. The carbide punches are made of tungsten carbide plate and rods by precision grinding or Wire Cutting. Sundi is committing to offering clients all kinds of carbide punches for mold demanding. In order to meet the required performance, the section of the raw material is very important, We will recommend the suitable materials according to practical application, to make sure the stability of metal working.

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Carbide Punches with Complex Top Shape

Carbide Punches with Complex Top Shape

These kinds of punches are widely used in the stamping tool for electronics and semiconductor, high precision and great working life

Round Punches

Round Punches

They’re grinded by cylindrical grinding and profile grinding, DLC and TiN coating will improve the working life.

Punches with Wire Cutting

Punches with Wire Cutting

The Wire Cutting can process all kinds of complex shapes with smooth surface, the tolerance can reach +/-0.001mm.

Main Manufacturing Process for Carbide Punch Tooling

SpecificationsDetails
MaterialsTungsten Carbide (F10,F20,KD20,HS40,HS25 and more )
Manufacturing ProcessSurface Grinding,Profile Grinding.
Accuracy+/-0.002mm
Parallelism+/-0.002mm
Flatness+/-0.002mm
Surface Finish0.4μm (polish)
Surface Treatment DLC /TIN/TICN coating
Inspection InstrumentsCoordinate Measuring,Tool Microscope,Height Gage,Surface Plate,Gage Blocks,Micrometer,Slide Caliper.
Typical Lead TimeAS short as two days for urgent

The Influence of Roughness on the Working Life

As a result of the carbide punch processing technology, the head grain of the punch is perpendicular to the center lines (see follows). The carbide punches slide relative to the die plates during working, if the toughness on the top is not good, It will has a great influence on the plates holes ,making the hole bigger than expected, so that the punch pins will be unstable and broken.

There’re three main types of failure of the carbide punches: adhesive wear, holding-on and particles broken. The best way is two choose proper material and control tolerance. We did the following experiment to show the influence of roughness when the dimension are the same, there’s 8-10% influence.

Before

carbide punches

After

carbide punches

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