Hard Pin Intermediary for High-Speed Cutter Body Clamping
Solution Overview
Problem
Existing cutting tools face challenges in securely attaching cutting members to cutter bodies at high rotational speeds due to centrifugal forces, leading to increased stress on clamping screws and potential wear on soft aluminum bodies, which limits their lifespan and performance.
Innovation Solution
A cutting tool design featuring a pin with attachment bores made of a harder material than the cutter body, using a clamping bolt and adjustment bolt with threaded sections or bayonet connections to securely attach a cutting member to a cutter body, distributing load and minimizing stress on the aluminum body, allowing for higher rotational speeds and reduced wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a clamping screw is used to secure the cutting insert to the cutter body, then the cutting insert is held firmly, but the stress on the clamping screw increases at high rotational speeds due to centrifugal forces
Solution Approach 1:
A hard pin is introduced as an intermediary component between the cutter body and clamping screw. The pin receives the clamping screw and transfers the clamping force to the cutting insert, while the pin itself protects the soft aluminum cutter body from direct stress. This mediator approach allows the system to withstand high centrifugal forces without compromising the cutter body.
Solution Approach 2:
The pin is made of hard material (such as steel) to provide localized high strength and hardness at the attachment point, while the cutter body remains soft aluminum for other purposes. This local quality differentiation allows the critical stress-bearing area to be hard while the overall structure maintains its original material properties.
2Device complexity
If a clamping screw directly engages with the aluminum cutter body, then the assembly is simple, but wear on the soft aluminum body increases, limiting lifespan
Solution Approach 1:
The hard pin serves as a protective intermediary between the clamping screw and the aluminum cutter body. Instead of the screw directly engaging the soft aluminum (which causes wear), the screw engages the hard pin, which in turn engages the cutting insert. This protects the cutter body from wear and extends its lifespan.
Solution Approach 2:
The hard pin can be designed as a replaceable component that absorbs wear and damage, protecting the more expensive and longer-lasting cutter body. When the pin becomes worn, it can be replaced without replacing the entire cutter body, effectively using a cheaper, shorter-lived component to protect a more valuable one.
3Weight of moving object
If the cutter body is made of soft aluminum for lightness, then the weight is reduced, but the hardness is insufficient to withstand high stress from clamping screws at high speeds
Solution Approach 1:
The system uses local quality differentiation by making only the critical stress-bearing components (the pin) out of hard material, while the majority of the cutter body remains soft aluminum for lightness. This selective hardening at the attachment point resolves the contradiction between overall lightness and localized strength.
Solution Approach 2:
The attachment system becomes a composite structure combining soft aluminum (cutter body) with hard material (pin). This composite approach allows the system to exhibit both the lightness of aluminum and the strength of hard material where needed, resolving the contradiction between weight and strength.
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 design provides a robust and accurate cutting tool with increased allowable rotation speed, longer service life, and improved surface quality finish by distributing stress and eliminating direct engagement with soft aluminum, thus enhancing productivity and product quality.
Implementation Method 1
distributing load and minimizing stress on the aluminum body
Implementation Method 2
reduced wear
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A system for attaching a cutting member (30, 230, 430, 530) to a cutter body (13, 513) includes a pin (50, 150, 250, 4-50, 550), a clamping bolt (60, 260, 460, 560) and an adjustment bolt (70, 270, 470, 570). The pin has a longitudinal axis and at least a first attachment bore (52, 152, 452) and a second attachment bore (53, 153, 453). The clamping bolt has a clamping section which is formed to releasably secure the cutting member to the cutter, body and has a first attachment section (61) which is formed to be releasably secured in the first attachment bore of the pin. The system may have an adjustment bolt that has an adjustment section which is formed to adjust the position of the cutting member relative to the cutter body and has a second attachment section (71) which is formed to be releasably secured in the second attachment bore of the pin.