What's your concerns to choose a metal stamping dies supplier?
When choosing metal stamping dies, your main concern isn't just if a supplier can make them, but whether they can consistently deliver over the long term with minimal risk.
Here Shenzhen Zhongyang Liye Precision Products Co.,Ltd list some concerns that you may have:
Die Life & Maintenance
Tooling Type & Cost Efficiency
Precision Capability & QC
Lead Time & Tryout
Material Specification
Die Life & Maintenance
"What is the guaranteed tool life in terms of strokes?"
For progressive stamping tool: Typically last around 3 million strokes, but that doesn't mean they're done after that. With proper maintenance like grinding the punches and dies, they can keep on working just fine.
For single-stroke stamping tool: Typically last 500,000 to 1 million strokes since they only perform one operation, so maintenance basically comes down to just replacing the punches.
Tooling Type & Cost Efficiency
"Is this a progressive die or a transfer die, and how does it impact the piece price?"
For low-volume stamping production, you should go with single-stroke stamping dies. If you're running high-volume production and need to boost efficiency, progressive dies are the way to go.
Tool pricing takes into account several factors, including: unit product price, material dimensions, tool size, tool material selection, manufacturing processes(Low speed WEDM or High speed WEDM), and shipping methods like sea or air freight.
Precision Capability & QC
"Can you meet the critical dimensions and what is your CPK target?"
Typically, products have a tolerance of +/- 0.1mm, but for some precision parts, it can be as tight as +/- 0.05mm or even lower. This really puts the tool maketr's skills to the test. At Shenzhen Zhongyang Liye Precision Products Co.,Ltd, our craftsmen all have over 20 years of experience and nail the tolerances every time.
As for the CPK (Process Capability Index), we maintain our CPK at levels above 1.33 or 1.67.
When it comes to burr height, we typically keep it under 5% of the material thickness.
Lead Time & Tryout
"What is the lead time to T1 samples and FOT?"
We need just 30 days to build the stamping dies, so we can deliver T1 samples and complete FOT within 45 days total, including the stamping die building time.
Material Specification
"What specific tool steel and coating are you using for the cutting inserts?"
Tool Steel Grade: such as D2, SKD11, DC53, Carbide/Tungsten Carbide
HRC (Rockwell Hardness): HRC 60-62
Coating / Surface Treatment: Protective coatings (such as TiN, DLC that improve wear resistance)