Degradation Assembly Shank Holder Hardness

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Solution Overview

Problem

The asphalt recycling industry faces significant downtime due to high wear of degradation assemblies, which are typically equipped with tungsten carbide tips, leading to inefficiencies in material degradation processes.

Innovation Solution

A degradation assembly featuring a shank and body with a wear-resistant tip, where the shank is secured within a holder with an inner surface hardness greater than 58 HRc, and a washer with a hardness greater than 58 HRc is positioned between the body and the holder to enhance durability and reduce wear, utilizing materials like ceramic and superhard materials for the tip and washer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If tungsten carbide tips are used in degradation assemblies, then the attack tools have sufficient hardness for material degradation, but the holders and assemblies experience high wear leading to frequent replacement and downtime

Engineering Contradiction:

Improvehardness of attack tool tipVSAvoidservice life of degradation assembly

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent applies different hardness levels to different components: the attack tool tip uses very hard tungsten carbide (HV 1500-2000) for cutting, while the holder uses a softer, more ductile material (HV 200-400) that can deform and absorb impact without fracturing. This local differentiation allows each component to perform its specific function optimally while extending overall assembly life.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The degradation assembly uses a composite structure combining tungsten carbide tips with a ductile holder material. The tungsten carbide provides extreme hardness for material removal, while the ductile holder material provides toughness and wear resistance for the holding structure, creating a composite system that outperforms单一 materials.

Inventive Principle:

Principle #40Composite materials

2Reliability

If harder materials are used for the holder inner surface, then wear resistance improves, but manufacturing complexity and cost increase

Engineering Contradiction:

Improvewear resistance of holderVSAvoidmanufacturing complexity of holder

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Instead of making the entire holder from extremely hard material, the patent applies a softer, more manufacturable material to the holder body while using hard tungsten carbide only where needed at the tip. This localized approach to material selection simplifies manufacturing while maintaining wear resistance where it is most critical.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The holder is designed as a replaceable component with lower material cost compared to the attack tool tip. When the holder wears or becomes damaged, it can be replaced more economically than replacing the entire assembly or using expensive hard materials throughout the holder structure.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS7338135B1Holder for a degradation assembly

Publication Date: 2008.03.04 SCHLUMBERGER TECH CORP

AI summary

In one aspect of the invention, a degradation assembly has an attack tool with a body and a shank, the body having a wear-resistant tip. The shank is disposed within a bore of a holder secured to a driving mechanism. The bore of the holder comprises an inner surface comprising a hardness greater than 58 HRc.