Cup Grinding Wheel Eccentric Dressing for Quieter Bevel Gears
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Solution Overview
Problem
Bevel gears machined using eccentrically moved cup grinding wheels often exhibit unusual noise behavior and surface waviness due to excessive surface contact and imperfections during the dressing and grinding processes.
Innovation Solution
A method involving a grinding machine with a tool spindle for a cup grinding wheel, a dressing spindle for dressing the wheel, and a workpiece spindle with an eccentric drive, where specific speed ratios are used during dressing and machining to optimize the interaction between the dresser, cup grinding wheel, and bevel gear workpiece, reducing surface imperfections and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a cup grinding wheel is used for machining bevel gears, then high-accuracy workpiece machining can be achieved, but the grinding wheel requires frequent dressing to maintain dimensional and shape accuracy within narrow tolerances
Solution Approach 1:
The patent applies dynamic dressing by superimposing an eccentric movement on the rotational movement of the cup grinding wheel during the dressing process. This causes the dressing tool to interact with different regions of the grinding wheel surface in a varying pattern, preventing the formation of regular wear patterns and extending the service life of the grinding wheel while maintaining machining precision.
2Object-affected harmful factors
If eccentric auxiliary movement is overlaid on the plunging movement of the cup grinding wheel, then overheating and clogging are avoided, but surface imperfections and noise behavior occur due to excessive surface contact
Solution Approach 1:
The patent applies dynamic dressing by superimposing an eccentric movement on the rotational movement of the cup grinding wheel during dressing. This creates a complex, non-repetitive contact pattern between the dressing tool and grinding wheel surface, preventing the formation of regular wear patterns and surface imperfections that would otherwise be transferred to the workpiece during machining.
Solution Approach 2:
The patent uses periodic eccentric movement with specific ratios between the rotational speed of the grinding wheel and the eccentric movement. This periodic variation in contact pressure and location distributes wear uniformly across the grinding wheel surface, preventing localized overheating and clogging while avoiding excessive surface contact that would cause imperfections.
3Manufacturing precision
If the dressing wheel is moved into the interior of the cup grinding wheel for dressing, then complete dressing of the grinding surface is achieved, but the machine complexity and operation complexity increase due to CNC-controlled movement and rotational direction reversal
Solution Approach 1:
The patent applies dynamic dressing by superimposing an eccentric movement on the rotational movement of the cup grinding wheel during the dressing process. This causes the dressing tool to interact with different regions of the grinding wheel surface in a varying pattern, preventing the formation of regular wear patterns and extending the service life of the grinding wheel while maintaining machining precision.
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 method results in reduced surface imperfections and noise behavior in bevel gear workpieces by ensuring uniform distribution of surface imperfections on the grinding wheel and controlled contact during machining, enhancing the finish and performance of bevel gears.
Implementation Method 1
a cup grinding wheel (10) provided with an abrasive surface and for rotationally driving the cup grinding wheel (10) around an axis of rotation (R1)
Implementation Method 2
the plunging movement of the cup grinding wheel (10) can be overlaid in plunge grinding and in generating grinding with an eccentric auxiliary movement of the grinding wheel center point M1
Implementation Method 3
a dressing wheel (30) seated outside and above the cup-shaped grinding wheel (10) for dressing the cup-shaped grinding wheel (10)
Data Source
AI summary
A method which is executed in a grinding machine comprisinga) rotationally driving a cup grinding wheel around an axis of rotation of a tool spindle at a first speed,b) rotationally driving a dressing tool around an axis of rotation of a dressing spindle at a second speed,c) carrying out a dressing method using the dressing tool, wherein a predetermined, fixed speed ratio is specified between the first speed and the second speed,and after steps (a), (b), and (c):i. eccentrically rotationally driving the cup grinding wheel around the axis of rotation of the tool spindle at a first machining speed using the eccentric drive,ii. carrying out a grinding method, wherein the bevel gear workpiece is machined by grinding using the cup grinding wheel.