Monolithic Bore Finishing Tool with Detachable PCD Cutting Elements
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Solution Overview
Problem
Existing surface machining devices for inner lateral surfaces of bores suffer from vibrations, leading to reduced tool lifespan and poor quality of groove-like surface structures, which impede the adhesion of wear-reducing coatings, especially on lightweight materials like aluminum alloys used in internal combustion engines.
Innovation Solution
A device with a fastening base body and cutting elements featuring polycrystalline diamond material, where cutting elements are reversibly detachably fastened using mechanical fastening elements and connected through a monolithic material region, reducing vibrations and facilitating easier maintenance and repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cutting elements are soldered to the tool body, then the cutting elements are securely fixed, but the assembly and repair becomes time-consuming and causes thermal deformation
Solution Approach 1:
The tool body is segmented into a modular structure with a receptacle that can receive different cutting elements. The cutting elements are detachably connected to the receptacle, allowing individual replacement without affecting other cutting elements. This segmentation enables easy maintenance while maintaining secure fixation during operation.
Solution Approach 2:
The connection between cutting elements and the tool body is made dynamic rather than static. The detachable connection allows the system to transition between a fixed state during operation and a detachable state during maintenance. This dynamic capability resolves the contradiction between secure fixation and ease of repair.
2Ease of repair
If cutting elements are replaceable, then maintenance becomes easier, but the structural complexity and potential vibrations increase
Solution Approach 1:
A receptacle structure serves as an intermediary between the tool body and cutting elements. This receptacle provides a stable, vibration-resistant connection while allowing easy insertion and removal of cutting elements. The intermediary structure absorbs the contradiction by providing both stability during operation and ease of replacement during maintenance.
3Strength
If thermal spraying is used to apply wear-reducing coating, then coating adhesion improves, but vibrations during machining prevent adequate adhesion
Solution Approach 1:
The tool design incorporates vibration reduction measures before the coating process. By ensuring stable, vibration-free machining through the improved cutting element fixation, the surface quality is enhanced in advance, creating a better substrate for subsequent coating application. This prior cushioning of vibrations ensures adequate adhesion when thermal spraying is performed.
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 solution effectively minimizes vibrations, enhances the service life of cutting edges, and improves the quality of groove-like surface structures, ensuring better adhesion of wear-reducing coatings on lightweight materials.
Implementation Method 1
cutting elements each having at least one cutting edge for producing a groove-like surface structure in the inner lateral surface of the bore
Data Source
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AI summary
To specify a device (1) for surface treatment of an inner surface of a bore, comprising a mounting base body (2) with a longitudinal axis (L) and an outer surface (6), cutting elements (3) attached to the outer surface (6) on mounting sections (8), wherein the cutting elements (3) each have at least one cutting edge (5) for generating a groove-shaped surface structure in the inner surface of the bore and at least one of the cutting edges (5) comprises a polycrystalline diamond material, by means of which the occurrence of vibrations can be reduced and at the same time the assembly and repair of the cutting elements (3) can be carried out more quickly and thus more cost-effectively, it is proposed thatthat at least one of the cutting elements (3) is reversibly detachable by means of at least one mechanical fastening element (12) and at least two of the fastening sections (8) are arranged at different longitudinal axis positions and are connected to each other by means of a monolithic fastening base body (2).