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Product Description
Product Overview
This die is specifically designed for the roll‑forming process of tubeless steel rims and serves as the core tool in the rim‑manufacturing sequence of “flaring → roll forming → expanding.” Based on the principle of counter‑rotating upper and lower roll‑forming dies, it progressively shapes a cylindrical blank—previously formed by rolling and welding—through three (or more) roll‑forming passes into a tubeless rim that meets stringent requirements for precise groove geometry, rim profile, and airtightness.
Key Features
Multi-stage incremental forming design: The “three‑roll‑two‑expand” or “three‑roll‑forming” process route is employed (primary roll forming → secondary roll forming → tertiary roll forming), with each pass’s die proportionally allocating the deformation amount to prevent excessive thinning or wrinkling. Parting‑line optimization for thinning control: the die cavity bottom is designed with an optimized parting‑line location, ensuring a balanced volume distribution between the left and right sides of the cavity bottom—where the left side has a smaller volume than the right—thereby effectively regulating material flow and preventing severe thinning at the fillet regions of the cavity bottom during roll forming (typically kept within ≤15%).
High-wear-resistant mold materials: The roller (upper die/lower die) is manufactured from Cr12MoV and H13, with a working surface hardness of HRC 58–62.
Airtightness Assurance: The surface finish and contour accuracy of the mold’s bead seat (15° conical surface) and the fillet at the bottom of the groove directly affect the sealing performance between the rim and the tire.
In 2012, it was recognized as "Jilin Science and Technology Enterprise" by Jilin Science and Technology Department ". In November 2013, it became the cooperative education base of Changchun Institute of Technology.
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