KB63-89 Bronze Intermediate Ring 4350707 | Crusher Spares

Technical Specifications: KB63-89 Intermediate Ring

The Intermediate Ring (Item 4350707), often referred to in legacy catalogs as a “Gasket Ring,” is a critical metallic interface within the Thyssenkrupp KB63-89 Gyratory Crusher. Unlike elastomeric seals, this 95kg bronze component is engineered to maintain precise spacing clearances while providing a fail-safe wear surface within the eccentric or dust seal assembly.

Core Advantages: Metallurgy & Manufacturing

In the procurement of crusher spares, the method of manufacture is as important as the material itself. For high-leaded bronze alloys like ZCuPb20Sn5, standard sand casting is insufficient due to the risk of lead segregation (gravity separation).

The Necessity of Centrifugal Casting

We manufacture the 4350707 Intermediate Ring exclusively using Centrifugal Casting. By rotating the mold at high G-forces during solidification, we achieve:

• Homogeneous Lead Distribution: The 20% Lead (Pb) content is dispersed as microscopic globules throughout the copper matrix. This ensures that every square millimeter of the ring has identical self-lubricating properties.
• Structural Density: The centrifugal force pushes lighter impurities (slag, gas oxides) to the inner diameter, which is subsequently machined away. This leaves a 100% dense, pore-free bronze ring that will not crumble under compressive load.

Performance Comparison: Service Life Analysis

Field data from primary crushing stations highlights the performance gap between generic replacements and our centrifugal components.

Field Diagnostic & Maintenance Tips

As dedicated crusher part suppliers, we recommend the following checks to determine if your Intermediate Ring requires replacement:

1. The “Fingernail” Test for Stepping:

Run your fingernail across the face of the ring. If you can feel a distinct step or ridge worn into the bronze, the mating component is grooving the ring. If this wear depth exceeds 0.5mm, the ring is no longer providing an effective seal/spacer function and must be replaced.

2. Thickness Variation:

Measure the thickness of the ring at four points (12, 3, 6, and 9 o’clock). If the variance exceeds 0.2mm, the ring is wearing unevenly, which indicates a misalignment in the crusher’s eccentric assembly or main shaft.

Quality Assurance

We ensure that this 95kg component meets the rigorous demands of mining:

• Flatness Verification: Every ring is placed on a granite surface plate to verify flatness is within 0.05mm. A warped ring will leak dust or oil immediately.
• Chemical Certification: Spectrometric analysis confirms the Sn (Tin) and Pb (Lead) levels are within the narrow tolerance of the ZCuPb20Sn5 specification.

Frequently Asked Questions (FAQ)

Q1: Why is this ring made of High Leaded Bronze instead of steel?

A: The Intermediate Ring acts as a sacrificial component. ZCuPb20Sn5 is softer than the mating steel parts. In the event of overload or debris ingress, the bronze ring will wear or deform, protecting the expensive main shaft or eccentric assembly from damage.

Q2: Can I reuse the Intermediate Ring if it looks okay?

A: We strongly advise against it. Even if visually intact, the ring has likely undergone work hardening and compression thinning. Reusing an old ring with new mating parts often leads to immediate sealing failures due to microscopic mismatches.

Q3: Does the ring come pre-machined?

A: Yes, Item 4350707 is supplied fully CNC machined to finished dimensions, ready for immediate installation. No on-site machining is required.

Expert Note on Installation

From the Engineer’s Desk: The most common cause of failure for the Intermediate Ring is not wear, but <s