Segmented Cutting Tool Holder for Road Milling Stability
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Solution Overview
Problem
Conventional cutting tool holding devices for road milling machines are prone to instability and damage due to high pressure and shock reactions, leading to reduced lifespan and increased repair costs, as they lack sufficient structural strength and stability.
Innovation Solution
The cutting tool holding device features a base with inclined positioning surfaces and a holder with a shaft and bearing surfaces, forming a pigeon-toed shape to enhance alignment and prevent separation, along with a locking mechanism to secure the holder, thereby increasing the device's strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the holder is detachably assembled with the base via a screwing member, then the cutting tool can be repaired or changed, but the structure is not strong enough to withstand high pressure and shock reactions
Solution Approach 1:
The holder is divided into two parts: a disposable holder body and a reusable shaft. The holder body can be easily replaced while the shaft remains in the base, enabling maintenance without replacing the entire assembly. This segmentation allows the cutting tool to be changed while maintaining a strong connection structure through the reusable shaft.
Solution Approach 2:
The holder combines different material characteristics: the holder body provides ease of replacement and cutting tool mounting, while the shaft provides structural strength and shock resistance. This composite structure resolves the contradiction between ease of repair and structural strength by combining components with different functional properties.
2Ease of repair
If the holder is detachably assembled with the base, then the cutting tool can be changed, but shocks generated by reaction may damage the cutting tool holding device
Solution Approach 1:
By segmenting the holder into a replaceable body and a permanent shaft, the design allows the strong shaft to remain in place to absorb shock reactions, while the weaker holder body can be replaced if damaged. This maintains device stability during operation while enabling easy repair when needed.
Solution Approach 2:
The shaft is designed with sufficient length and strength to act as a shock-absorbing element before damage occurs. The tapered portion and overall shaft structure provide beforehand cushioning against shock reactions, protecting the entire holding device from damage during high-pressure milling operations.
3Ease of manufacture
If the structure of the cutting tool holding device is not strong enough, then the assembly is easier to manufacture, but assembling instability occurs under high pressure
Solution Approach 1:
The holder is segmented into a simple holder body and a shaft with specific geometric features (tapered portion, circular cross-section). This segmentation allows each component to be manufactured separately with relatively simple processes, while the combination provides the necessary assembling stability through the precise fit between the shaft and base bore.
Solution Approach 2:
The shaft features an asymmetric tapered portion that provides directional engagement with the base. This asymmetric geometry ensures proper alignment and stable assembly under high pressure, while the overall structure remains manufacturable. The tapered design creates a natural locking mechanism that prevents instability without requiring complex manufacturing.
4Ease of repair
If the holder is detachably assembled with the base, then the cutting tool can be changed, but the life time of the cutting tool holding device is reduced
Solution Approach 1:
The holder is segmented into a disposable holder body and a reusable shaft. The shaft, being the more durable component, can be retained in the base for an extended period, significantly extending the lifespan of the holding device. Only the holder body needs replacement, not the entire assembly, thereby maintaining long-term operational capability.
Solution Approach 2:
The holder body is designed to be discarded and replaced when worn or damaged, while the shaft is recovered and retained in the base. This selective replacement strategy extends the overall lifespan of the holding device by recovering the durable shaft component and only replacing the consumable holder body, reducing waste and maintaining long-term functionality.
Data Source
AI summary
A cutting tool holding device includes a base and a holder. The base includes a base body and an inserted bore. The base body includes a central connecting surface and two positioning surfaces. A lateral edge of each of the positioning surfaces is connected to the central connecting surface, and the two lateral edges are defined as a first lateral edge pair. The holder includes a disposing head and a shaft. The disposing head includes a head body and a tool bore. The head body includes a disposing surface and two bearing surfaces. Two lateral edges of the two bearing surfaces are defined as a second lateral edge pair. Two extending lines of the two lateral edges of at least one of the first lateral edge pair and the second lateral edge pair are close to each other.