Machining Segment Green Body Layout for Low Side Surface Wear

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Solution Overview

Problem

Machining segments for tools like core drill bits, saw blades, and cut-off grinding chains experience increased wear on side surfaces due to friction with concrete substrates, particularly due to the wear properties of the first matrix material, and existing methods require special tool components and surface sharpening to expose hard material particles.

Innovation Solution

A method for producing a green body using a powdered or granular first matrix material, first hard material particles, and second hard material particles, where a supporting material is applied in layers to embed the second hard material particles, allowing for conventional press punches to be used in compacting and further processing to form machining segments with reduced side surface wear without reworking.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If second hard material particles are admixed with the first matrix material as randomly distributed particles, then wear on side surfaces is reduced, but the particles are embedded completely in the matrix material requiring sharpening to expose them

Engineering Contradiction:

Improvewear on side surfacesVSAvoidneed for sharpening

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The second hard material particles are arranged in a lower layer before the first matrix material is applied, so that they protrude through the matrix material surface automatically during compaction, eliminating the need for subsequent sharpening operations to expose them

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of distributing particles randomly within the matrix volume, the invention positions particles in a separate lower layer dimension, allowing them to protrude through the matrix surface and providing wear protection without requiring post-processing exposure

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Manufacturing precision

If machining segments are produced with hard material particles arranged in a defined particle pattern, then machining performance is improved, but the production process becomes more complex

Engineering Contradiction:

Improveparticle pattern arrangementVSAvoidproduction process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The machining segment is divided into distinct layers (lower layer with second particles, first matrix material layer with first particles, upper layer), allowing each layer to be produced and arranged separately with defined patterns before being compacted into the final structure

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Hard material particles are arranged in defined patterns in the lower layer before the matrix material is applied and compacted, establishing the precise particle distribution in advance rather than requiring complex in-situ arrangement during final processing

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20230256508A1Method for producing a green body and method for further processing the green body to form a machining segment

Publication Date: 2023.08.17 HILTI AG

AI summary

Method for producing a green body for a machining segment (51) from a powdered or granular first matrix material (56), first hard material particles (57) and second hard material particles (58), the machining segment being connected by an underside (61) to a basic body of a machining tool. The machining segment (51) has a projection of the second hard material particles (58) with respect to the first matrix material (56) on the side surfaces.