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Tubeless expansion mandrel

The company is mainly engaged in the production and sales of turbine impellers, compressor impellers, automobile machinery parts, construction machinery castings, mechanical and electrical product parts, molds, and micro-motors.

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Product Overview

This mold is specifically designed for Tubeless steel rim The expansion, sizing, and shaping process is the critical expansion die in the “three-rolling, two-expansion” manufacturing process. It employs… Pyramidal drive structure By driving the expansion module to radially expand in synchrony with the axial movement of the pyramid, the rolled rim blank is precisely fitted to the die cavity, thereby achieving final diameter setting, shape correction, and dimensional stabilization of the rim.

Key Features

Pyramidal drive structure : Adopt Pyramid As the actuating element, the conical body features 12 to 18 precisely machined conical surfaces, each of which drives a corresponding expansion module. Compared with low‑polygon‑cone designs, this prismatic structure employs a greater number of expansion modules, achieves more uniform circumferential distribution, and delivers a more balanced expansion‑force profile.

Modular synchronous expansion and growth : The 12–18 expansion modules are radially and uniformly distributed along the frustum’s circumferential perimeter; as the frustum advances axially, the modules, driven by the conical surface, move along the slide plate/slide rail. Synchronously expanding radially outward , ensuring uniform circumferential expansion of the rim.

Wedge-shaped fit and wear-resistant design : The expansion module is connected to the pyramidal frustum surface by Wedge fit , the mating surface can be inlaid Wear strip/wear block , significantly reducing frictional losses and extending die life.

Centralized lubrication system : Equipped with Automatic or manual centralized lubrication system , perform scheduled, metered lubrication on all sliding surfaces (pyramidal conical surfaces, module slides, T‑slots, etc.) to ensure smooth expansion and contraction movements and to minimize wear and the risk of jamming.

Modular quick-change structure : The expansion module adopts a modular design; by swapping out expansion modules and pyramidal inserts of different specifications, it can be quickly adapted to… Different rim models Switching between (diameter and width).

Key words:

Turbine impeller, compressor impeller, automobile machinery parts, engineering machinery castings, mechanical and electrical product parts, molds

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Tubeless expansion mandrel