Insulated Cup Body Mold Technology and Practical Experience (Part 1)

A cup holds stories, and life carries warmth. Hello everyone, "Dong Dong's Cup Talk" is here! In our previous article, we invited Mr. Feng, our plastic mold specialist, to share key considerations in plastic mold manufacturing. Today, we're joined by Mr. Ding, our metal stamping mold expert, http://www.zhanyict.com/en/ProductsDetail-VB-10481.htmlwho will discuss insulated cup body mold technologies and practical experience. Given the depth of the topic, we'll break it down into multiple parts.

I. Core Processes and Key Stages in Stainless Steel Cup Body Mold Manufacturing

1. Product Process Planning

- Material Properties: 304 stainless steel has high hardness (HRB 80-90) and poor ductility, requiring precise calculation of the drawing coefficient (first draw ≤ 0.55).

- Process Breakdown: http://www.zhanyict.com/en/ProductsDetail-VB-10481.htmlFor double-layer cups, the steps include: blanking → first drawing → second drawing → trimming → bottom necking → thread rolling → vacuum brazing (Failure case: A brand experienced over 40% rupture rate in the second draw due to uncalculated material thinning).

2. Key Mold Design Considerations

- Drawing Mold Structure: Punch/die clearance should be 1.1x material thickness (0.55mm for 0.5mm stainless steel), with fillet radius ≥5x material thickness (to prevent cracking).

- Lid Mold: http://www.zhanyict.com/en/ProductsDetail-VB-10481.htmlThread forming requires separate rough/finish steps (Success case: A Japanese brand achieved thread fit accuracy of ±0.02mm).

- Double-Layer Cup Body: The gap control module between inner and outer walls must include laser positioning (tolerance ±0.1mm).

3. Challenges in Mold Machining

- Material Selection: Drawing punches use SKD11 hardened to HRC 60-62 (wear/anti-stick), while dies use titanium-coated DC53.

- Surface Polishing: http://www.zhanyict.com/en/ProductsDetail-VB-10481.htmlDrawing dies require mirror polishing to Ra≤0.1μm (Failure case: Rough polishing caused surface scratches, scrapping an entire batch).

(To be continued in upcoming parts...)