Allowable deflection analysis of modern machine tool spindles (2)

2. Three-support structure, the former middle support is the main support: as shown in the schematic 2

Simplified to the front and middle supports, the spindle end deflection is:

y=Pa 2 (L+a)/(3EJ)-R C a L/(6EJ)+R A (1+a/L)/C 1 +R B (a/L)/C 2

Among them, R A , R B and R C are supporting reaction forces, which can be obtained according to "Engineering Mechanics".

3. Three support structure, take the front and rear support as the main support: as shown in Figure 3

Simplified to the front and rear support, the spindle end deflection is:

y=Pa 2 (L+a)/(3EJ)-R C a (L 2 - 2 )/(6EJL)+R A (1+a/L)/C 1 +R B (a/L)/C 2

Among them, R A , R B and R C are supporting reaction forces, which can be obtained according to "Engineering Mechanics".

1

Where P---the head end force (bovine);

E---the elastic modulus of the spindle material (bull/mm 2 );

J --- the average moment of inertia of the main shaft section (mm 4 );

C 1 and C 2 --- front and rear bearing stiffness (bull / mm 2 );

a --- The amount of front end of the spindle (mm);

L --- span between main supports (mm);

---Auxiliary support span (mm);

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