Grinding Machine Dynamic Clamping for Precision Shafts
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Solution Overview
Problem
Machine components with a journal of smaller diameter at one end and a recess at the opposing end pose challenges in precise grinding due to inaccessible areas when using conventional clamping methods, requiring stringent dimensional accuracy and centering.
Innovation Solution
A grinding method and machine that allows for different clamped positions without changing the machine component's position, using releasable clamping jaws, a steady for support, and adjustable clamping to center the journal and grind the exterior and interior surfaces with CBN wheels, enabling precise circular and non-circular grinding of the journal, exterior contours, and interior recesses in the same clamped conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional clamping methods (clamping on one side with steady supporting the free end) are used, then the machining process can be performed on a single machine, but certain areas of the machine component become inaccessible for grinding
Solution Approach 1:
The patent applies dynamic clamping by using releasable clamping jaws that can be opened and closed, and a movable steady that can be repositioned along the workpiece. This allows the clamping configuration to change during the grinding process, enabling access to different areas (exterior surfaces, interior recess, journal) without changing the workpiece position in the machine, thus resolving the contradiction between single-machine processing and grinding area accessibility
2Ease of manufacture
If the journal is ground with conventional clamping, then the process is simple, but the centering precision and dimensional accuracy are insufficient
Solution Approach 1:
The patent applies preliminary action by first clamping the workpiece between the workpiece headstock and tailstock in a precise positioning configuration before grinding the journal. The releasable clamping jaws and movable steady are positioned in advance to ensure accurate centering of the journal, and only after this precise setup is the grinding operation performed. This preliminary precise clamping ensures both centering accuracy and dimensional precision while maintaining process simplicity
3Ease of operation
If the workpiece position is changed in the grinding machine to access different areas, then all areas can be ground, but the clamped conditions must be changed which complicates the process
Solution Approach 1:
The patent uses dynamic clamping elements (releasable clamping jaws and movable steady) that can be adjusted during the grinding process without changing the workpiece position in the machine. The clamping configuration is made dynamic rather than static, allowing the same workpiece position to accommodate different grinding operations on various areas (exterior, interior, journal) by simply adjusting the clamping elements, thus avoiding the complexity of changing clamped conditions
Data Source
AI summary
Disclosed is a method for grinding a machine part that is used as a drive shaft, for example, rotates about the longitudinal axis thereof during the grinding process, and is provided with a journal at one axial end thereof and a recess at the opposite end thereof. The grinding process is carried out in one and the same grinding machine. In said grinding method, the machine part is brought into different clamped states by means of a chuck of a workpiece spindle head with releasable clamping jaws and a centering tip, a backrest, and/or a tailstock quill. Changing the clamped states has the advantage that the machine part remains in the same position in a single grinding machine, i.e. the clamped position, in all the different clamped states such that more accurate sizes, shapes, and positions can be obtained in an economical manner and all areas of the machine part which are to be ground are successively accessible to the grinding disks.