Replaceable-tip Cutting Tool Dual-Material Thread Rigidity
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Solution Overview
Problem
Replaceable-tip cutting tools with cemented carbide main bodies and cutting heads are susceptible to vibration damage due to the rigidity reduction caused by the installation of a helisert in the female threaded portion, which compromises the tool's ability to maintain rigidity and prevent thread crest damage during cutting operations.
Innovation Solution
The use of a dual-material female thread system, where the first female thread portion is made from a low-rigidity material like steel and the second female thread portion is made from a high-rigidity material matching the cylindrical portion, combined with a thicker cylindrical portion, to absorb vibration shocks and maintain tool rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a helisert is installed in the female threaded portion to reduce vibration damage, then the possibility of thread crest damage is reduced, but the radial thickness of the cemented carbide main body must be reduced, which diminishes the rigidity of the main body
Solution Approach 1:
The patent applies local quality by creating a dual-material female threaded portion where the first female threaded portion (in contact with male threads) is made of steel with lower rigidity to absorb vibration shocks and protect thread crests, while the second female threaded portion (support structure) is made of cemented carbide with high rigidity to maintain main body strength. This localized material differentiation allows each region to optimize its properties for its specific function.
Solution Approach 2:
The patent employs composite materials by combining steel and cemented carbide in the female threaded portion. The steel component provides vibration damping and shock absorption capabilities, while the cemented carbide component provides structural rigidity and strength. This composite structure resolves the contradiction between needing low rigidity for vibration absorption and high rigidity for maintaining main body strength.
2Reliability
If the diameter of the female threaded portion is increased to accommodate a helisert, then the male threaded portion can be protected from vibration damage, but the radial direction thickness of the main body must be reduced
Solution Approach 1:
The invention applies local quality by differentiating the material properties of different regions within the female threaded portion. The first female threaded portion uses steel with lower rigidity specifically for vibration absorption where it contacts the male threads, while the second female threaded portion uses cemented carbide with high rigidity for structural support. This allows the threaded portion to have enhanced vibration resistance without compromising the overall main body thickness and rigidity.
Solution Approach 2:
The female threaded portion is segmented into two distinct material zones: a steel first female threaded portion for vibration damping and a cemented carbide second female threaded portion for structural integrity. This segmentation allows the system to simultaneously achieve vibration resistance and maintain adequate main body thickness, as each segment performs its specialized function without requiring increased overall dimensions.
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
This configuration effectively reduces the risk of thread crest damage and maintains the tool's rigidity, allowing for precise fastening and extended service life by dampening vibration impacts during cutting operations.
Implementation Method 1
The first female thread portion is made from a second metal material that is different from the first metal material... making it possible both to maintain the rigidity of the main body and to reduce the possibility of damage of the thread crests of the male threaded portion or the female thread portion due to the shock of vibration
Implementation Method 2
The use of a metal material with comparatively low rigidity for the first female thread portion and a metal material with comparatively high rigidity for the second female thread portion and the cylindrical portion makes it possible both to maintain the rigidity of the main body and to reduce the possibility of damage
Data Source
AI summary
A main body (3) of a replaceable-tip cutting tool (1) includes a cylinder-shaped cylindrical portion (32) made from a first metal material and extending in an axial direction, and with a female thread portion (33) provided on an inner circumference (40) of the cylindrical portion (32) and capable of being screwed together with a male threaded portion (24) of a cutting head (2). The female thread portion (33) includes a first female thread portion (34) and a second female thread portion (35). The first female thread portion (34) is a portion between a top of a female thread crest (37) of the female thread portion (33) and a portion of the female thread portion (35) that is on the female thread crest (37) side of a female thread root (36) and on the female thread root side of a portion corresponding to an effective diameter of the female thread portion (33). The first female thread portion (34) is made from a second metal material that is different from the first metal material. The second female thread portion (35) is continuous with the inner circumference (40) of the cylindrical portion (32). The second female thread portion is a remaining portion of the female thread portion excluding the first female thread portion. The second female thread portion (35) is made from the first metal material.