Segmented Hobbing Tool with Replaceable Indexable Inserts
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Solution Overview
Problem
Current hobbing tools for generating small-sized gears often use solid high-speed steel or cemented carbide tools, which are not suitable for producing high-quality gears due to wear issues and lack of indexable insert solutions, leading to inefficient gear production.
Innovation Solution
A hobbing tool design featuring a hob body with axially extending slots and removable cassettes, each with seating recesses and indexable cutting inserts that can be easily replaced and adjusted, allowing for precise positioning and secure clamping to ensure consistent gear quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid high-speed steel or cemented carbide hobs are used for generating small-sized gears, then the tool structure is simple and durable, but the gear quality deteriorates due to wear and lack of indexable insert solutions
Solution Approach 1:
The hob tool is segmented into a hob body and multiple replaceable cutting inserts. The cutting inserts are separated from the hob body and can be independently replaced when worn, allowing the durable hob body structure to be retained while refreshing the cutting edges to maintain gear quality.
Solution Approach 2:
The invention changes the parameter of tool wear by introducing replaceable cutting inserts that can be indexed to fresh cutting edges. This allows the effective cutting edge to be reset multiple times before the insert needs replacement, extending tool life while maintaining consistent gear quality throughout the insert's service life.
2Productivity
If indexable inserts are used in hobbing tools for roughing operations, then productivity increases, but gear quality deteriorates due to inability to guarantee fine quality
Solution Approach 1:
The cutting inserts are designed with universal applicability to perform multiple functions - they can be used for both roughing and finishing operations. The same insert structure with precise mounting and indexing capability enables high-productivity roughing while maintaining the precision required for quality gear generation throughout the insert's service life.
3Ease of repair
If inserted-blade cutter assemblies with removable blades are used, then blade replacement is possible, but device complexity increases and indexable insert solution is not provided
Solution Approach 1:
The cutting insert mounting system incorporates dynamic elements such as spring-loaded clamps or adjustable locking mechanisms that allow for quick and easy insert replacement. The mounting structure can be rapidly opened and closed, enabling blade replacement without complex disassembly procedures, thus maintaining ease of repair while controlling device complexity.
Data Source
AI summary
A hobbing tool includes a hob body having at least one axially extending slot, and at least one cassette removably disposed in the at least one slot. The at least one cassette includes at least one seating recess having at least a bottom abutment surface and two side abutment surfaces. At least one cutting insert is removably mounted in the at least one seating recess. The at least one cutting insert has at least one bottom supporting surface and two side supporting surfaces that abut the bottom abutment surface and the two side abutment surfaces when the at least one cutting insert is received in the at least one seating recess. The hob body includes a plurality of axially extending slots. The hobbing tool also includes a corresponding plurality of cassettes removably mounted in the plurality of axially extending slots. Each cassette of the plurality of cassettes is identical to every other cassette of the plurality of cassettes.