Deburring Tool Knife Holder Mounting Design
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Solution Overview
Problem
The existing deburring tools face difficulties in assembly and disassembly due to the use of bearing bolts, which require a press fit and can be challenging to remove, often necessitating thermal expansion for disassembly, and are not suitable for holding multiple bar knives securely.
Innovation Solution
A deburring tool design where the knife holder is mounted directly in a cylindrical bore within the base body, eliminating the need for bearing bolts, and utilizing a pull-out protection mechanism for secure assembly and easy disassembly, allowing for a more stable and wear-free rotary bearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bearing bolts are used to mount the knife holder, then the knife holder can be securely mounted, but assembly and disassembly become difficult requiring thermal expansion
Solution Approach 1:
The invention extracts and eliminates the bearing bolts from the mounting system. Instead of using bearing bolts that require press fit and thermal expansion for removal, the knife holder is directly mounted in a receiving bore through interference fit, allowing simple extraction by pulling the knife holder out of the bore.
Solution Approach 2:
The invention inverts the mounting approach by using an interference fit that is easy to assemble but easy to disassemble through thermal contraction rather than requiring thermal expansion to break a press fit. The knife holder is heated for assembly to expand into the bore, then cooled for easy removal as it contracts.
2Stability of the object's composition
If bearing bolts are used to hold the knife holder, then the structure is stable, but the number of parts increases and assembly complexity increases
Solution Approach 1:
The invention merges the knife holder mounting function directly into the receiving bore of the base body, eliminating the need for separate bearing bolts. The knife holder is held securely by the interference fit between its outer surface and the receiving bore wall, reducing the assembly to essentially two main parts.
Solution Approach 2:
The receiving bore serves multiple functions: it provides the mounting location for the knife holder, creates the interference fit for secure holding, and defines the rotational axis. This multi-functional design eliminates the need for separate bearing components.
3Strength
If adhesive is used to fix bearing bolts, then the bearing bolts are securely fixed, but residues can enter the interior and prevent knife holder rotation
Solution Approach 1:
The invention extracts and eliminates the bearing bolts that required adhesive fixation. By using direct interference fit mounting of the knife holder in the receiving bore, the need for adhesive is removed entirely, preventing residue contamination and rotation interference.
4Strength
If the knife holder is mounted with bearing bolts, then the mounting is secure, but disassembly requires heating the entire tool
Solution Approach 1:
The invention inverts the thermal process timing: heating is applied during assembly to expand the knife holder for easy insertion, then cooling occurs during storage or operation. For disassembly, the knife holder is heated again to expand and break the interference fit, then removed while expanded, eliminating the need to heat the entire tool.
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 design simplifies assembly and disassembly, allows for larger and more stable knife holder dimensions, and enables secure guidance of the bar knife, reducing wear and improving the tool's service life while accommodating multiple bar knives.
Implementation Method 1
The pull-out protection consists of a bolt that can be shortened and broken off in length, which passes through a transverse bore in the knife holder and penetrates the bore for receiving the bar knife with a side surface, and rests against an assigned receptacle on the bar knife to prevent the bar knife from being pulled out unintentionally
Implementation Method 2
In order to loosen this press fit of the bearing bolts, the entire tool had to be heated in order to remove the bearing bolts from their seat due to thermally induced linear expansion of the individual parts
Data Source
Figure 1~5
Figure 6
AI summary
The tool has a base body (1) rotatably driven about a longitudinal axis. A bar blade (3) is held exchangeably in a spring-loaded, swivelably mounted cylindrical blade holder (2) in the base body in a radial bar blade bore of the holder. The holder is designed as a cylindrical body that is rotatably mounted in a bearing bore (6) of the holder. Two bores of the bearing bore are separated from each other in a center part of the base body by a blade groove in the base body. A longitudinal flexible spring is inserted into the groove that is designed as a longitudinal recess in the base body. The bearing bore is formed as a transverse bore. An independent claim is also included for a bar blade for a deburring tool.