Brazed Pick Strike Construction With Rounded Joint Edges
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing super-hard pick tools for applications like pavement milling and rock boring face challenges in achieving a high working life due to issues with wear and stress concentrations at brazed joints, leading to potential cracking and fracture.
Innovation Solution
A method for constructing a strike construction with a strike tip and support body, where the attachment ends are joined with a braze alloy, and the exposed edges are processed to form an arcuate edge defined by an osculating circle with a radius of at least 0.01 mm, reducing stress concentrations and using abrasive jet machining to remove residual material and round edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the support body is joined to the strike tip with a braze alloy, then the attachment strength is improved, but stress concentrations and cracking risk at the brazed joint increase
Solution Approach 1:
The patent applies curvature by forming an arcuate edge area at the exposed edge of the support body, where the arcuate edge defines an osculating circle with a radius of at least 0.01 mm. This curved geometry replaces sharp edges that would concentrate stress, thereby reducing stress concentrations at the brazed joint while maintaining attachment strength through the braze alloy.
2Manufacturing precision
If extensive grinding is performed on super-hard materials to remove affected zones, then manufacturing precision is improved, but manufacturing time and costs increase
Solution Approach 1:
The patent applies preliminary action by providing a precursor body with a proximate end that is pre-configured with sides depending divergently, creating an exposed edge that requires minimal subsequent processing. The precursor body is designed in advance to have the correct geometric configuration, so that only minor arcuate edge processing is needed rather than extensive grinding of the final product.
Solution Approach 2:
The manufacturing process is segmented into distinct stages: providing a precursor body with pre-formed geometry, joining the strike tip to the precursor body, and then performing minimal arcuate edge processing. This segmentation allows the bulk of material shaping to be done on the precursor body before the super-hard strike tip is attached, reducing the need for extensive grinding of the final assembled product.
3Adaptability or versatility
If the precursor body is used with slightly misshapen geometry, then manufacturing flexibility is improved, but manufacturing precision deteriorates
Solution Approach 1:
The arcuate edge processing step applies curvature with a minimum radius of 0.01 mm to the exposed edge of the precursor body. This curved geometry tolerance accommodates slight variations in precursor body shape while ensuring that the final geometric precision meets required standards, thereby bridging the gap between manufacturing flexibility and precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enhances the working life of the pick tools by reducing internal stress and the risk of cracking, while also increasing manufacturing efficiency and reducing costs by allowing the use of slightly misshapen precursor bodies and minimizing the need for extensive grinding of super-hard materials.
Implementation Method 1
joining the attachment end of the strike tip and the attachment end of the support body by means of a braze alloy material disposed between them
Implementation Method 2
heating the braze alloy material to melt it and wet both attachment ends
Implementation Method 3
applying an abrasive jet to the strike construction to round non-arcuate edges and/or remove residual material attached to a side of the strike tip or support body
Implementation Method 4
applying an abrasive jet to the strike construction
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A method of making a strike construction for a pick tool, a strike construction for a pick tool and a pick tool. The strike construction comprises a strike tip and a support body, in which respective attachment ends of each of the strike tip and support body are joined to each other, the attachment end of the strike tip is coterminous with cemented carbide material comprised in the strike tip, and the attachment end of the support body is coterminous with cemented carbide material comprised in an end portion of the support body, the end portion being configured such that sides of the support body depend divergently from its attachment end. The method includes providing the strike tip and a precursor body for the support body, in which a proximate end of the precursor body is coterminous with cemented carbide material comprised in an end portion of the precursor body, the end portion of the precursor body being configured such that sides of the precursor body depend divergently from its proximate end, the area of which is less than the area of the attachment end of the support body. The method further including processing the end portion of the precursor body to increase the area of the proximate end to that of the attachment end of the support body; and joining the respective attachment ends of the strike tip and the support body to provide the strike construction.