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.
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
They’re grinded by cylindrical grinding and profile grinding, DLC and TiN coating will improve the working life.
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
|Materials||Tungsten Carbide (F10,F20,KD20,HS40,HS25 and more )|
|Manufacturing Process||Surface Grinding,Profile Grinding.|
|Surface Finish||0.4μm (polish)|
|Surface Treatment||DLC /TIN/TICN coating|
|Inspection Instruments||Coordinate Measuring,Tool Microscope,Height Gage,Surface Plate,Gage Blocks,Micrometer,Slide Caliper.|
|Typical Lead Time||AS 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.