Lathe tailstock uses the improvement of vivid tip

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  • source:FRESE CNC Machining
1 preface our reference standard pursues lathe tailstock that treatment makes live 5 numbers with Mohs tip, use at locating to the aperture inside workpiece, process work outside end panel and wine cup pours inside 30 ° of 5 × . The circumstance of fixed position clamp of the structure of vivid tip and workpiece sees the graph is shown 1 times. Workpiece of 11 inside aperture diameter is 100+0.

01+0.

13, exterior surface roughness is Ra0.

8 μ M, set cover in awl 10 on. Awl is covered 10 it is / of structure of 6 divide into equal parts, in big nut the action of 9 falls, can along arbor of 3 outside cone axial is ongoing, pair of workpiece arrive since of 11 inside the action of fixed position clamp of aperture. Part of the head of a bed also uses similar awl to cover reach big nut structure to workpiece inside clamp of opening fixed position. 1.

Gland 2.

Copper is covered 3.

Arbor 4.

Top put oneself in another's position 5.

One-way thrust ball bearing 6.

Tapered roller bearing 7.

Impaction nut 8.

Bolt 9.

Big nut 10.

Awl is covered 11.

Workpiece pursues 12 structures analysis is processing work inside the discovery when pouring wine cup pours horny width not the case that change of 3 outward axial gives divide evenly and arbor. Through serious analysis, we think, the cause that creates these appearances includes the following fields: 1) arbor force of 3 susceptive axial by one-way thrust ball bearing 8207 bear, and radial is jumpy and main by tapered roller bearing 7207 come demarcate, this bearing itself relies on impaction nut 7 will be tightened beforehand. Impaction nut 7 cannot tighten effectively beforehand, brought about arbor directly 3 radial and jumpy out of tolerance, wine cup pours inside the work that treatment gives not divide evenly. The detailed structure of arbor sees the graph is shown 2 times. × of M48 of the whorl when machining arbor 1.

5 had machined first, it is better that the axes coaxial of screw center diameter and arbor is spent, after whole quenchs, whorl place arose to be out of shape, cause big nut 9 cover the valve of 6 divide into equal parts of 10 to cannot be contacted completely with awl, affected the centering precision that awl covers. Graph the detailed dimension of 7 sees 2 impaction nut the graph is shown 3 times. Itself relies on the bolt locking of M4, the locking edge that is 6mm as a result of the ply on impaction nut is thicker, make the locking effect of M4 bolt not big, easy cause 2 whorl of M80 × to become loose, increase top put oneself in another's position 4 on inside after existence quenchs, whorl also is out of shape problem, can make the centering precision of 7207 reduces tapered roller bearing greatly, cause the radial and jumpy out of tolerance of arbor. The axis that graph 32) awl covers end panel and inner cone range is not vertical, also be one of causes that cause radial and jumpy out of tolerance. Head of axis of 3) arbor rear is too fine, have 10mm only, stiffness is insufficient, installation and cutting add man-hour to bend extremely easily, cover with copper 2 grind dead, have the effect that is less than sliding bearing, also can cause arbor radial to beat too big. The change outside 4) heart axial is moved, because do not have axial spacing be caused by,be. Lean only arbor and of the aperture inside two bearing cooperate, assure very hard to be in be not taken when axial force. 3 structures improve a basis above analysis, we were done to original structure alter below. See the graph is shown 4 times. Graph 41) uses deep trench ball bearing 307 replace bearing of former tapered roller 7207, at the same time impaction nut chamfer, see the graph is shown 4 times, make its act well to the outer lane of bearing only. Such, although end panel and bearing cannot be contacted completely, 307 itself also can maintain deep trench ball bearing certain centering precision. 2) changes the ply of edge of impaction nut locking, by 6mm instead 3mm, in order to enhance the locking action of M4 bolt. The wall that 3) reduces copper to cover is large, increase arbor rear diameter at the same time, namely by original F10mm instead F20mm, and cooperate precision so changeless, in order to raise the stiffness of arbor itself. 4) raises the verticality of the whorl outside arbor and itself axes. Will original arbor whole quenchs instead two end quench craft, mid outside whorl does not quench processing. With two centers aperture decides a circle outside grinding after heat treatment, car whorl. 5) raises awl to cover the verticality of left end panel and its itself axes. 6) considers one-way thrust ball bearing 8207 disassemble convenient, 4 4 alveolus are gotten to do on top put oneself in another's position tear open outfit aperture. An axis increases to use stretch back-up ring between two bearing of 7) , move in order to prevent arbor axial change. The vivid tip of new structure sees the graph is shown 5 times. 1.

Gland 2.

Copper is covered 3.

Arbor 4.

Top put oneself in another's position 5.

One-way thrust ball bearing 6.

Back-up ring 7.

Deep trench ball bearing 8.

Impaction breechblock 9.

Bolt 10.

Big nut 11.

Awl is covered 12.

Workpiece pursues 5 CNC Milling CNC Machining