CN2070213U - Shift claw adjustable mechanical floating end face shifting top - Google Patents

Abstract

The utility model relates to a mechanical floating type face driver center with an end bracket, which is used on a lathe. The utility model uses the spherical wave balance principle and simplifies the structure, a plurality of equant guiding grooves are arranged on the finger and around the slide columns, three slide columns (or fingers) rotate synchronically in an equant distance, and thus the centre distance of the finger can change a size in order to be suitable for the workpieces with different diameter sizes. The utility model has the advantages of novel, simple and compact structure, convenient and flexible use, labor saving, time saving and full rigidity. The utility model raises the efficiency, decreases the labor intensity and ensures the higher machining accuracy. The utility model is suitable for rough turning and semi-finish turning with brute force.

Description

The adjustable mechanical float face driver center of pusher dog

The utility model relates to a kind of face driver center, mechanical float formula face driver center particularly, it can be installed in the various lathe spindle taper holes of magnetic tape trailer frame, with another live centre, live the centre bore of workpiece with the central term pinnacle, end face pusher dog tooth portion penetrates workpiece end face, stirs workpiece and main shaft turns round synchronously, thereby can finish the processing tasks of whole peripheries of shaft-like workpiece in a clamping.

As everyone knows, design a kind of face driver center, must solve three problems: the one, there is one axially drag is arranged enough, and the center of energy axial float is top, can make the workpiece radial centering, and, constitute the axis of rotation of workpiece, and don't interfere pusher dog to be rolled into the work of workpiece end face with another live centre; Two more will have several (preferably three) end face pusher dogs, its end face is shaped on pointed tooth, can penetrate workpiece end face, driving workpiece and machine tool chief axis turns round synchronously, and these pusher dogs are axially wanted to keep the balance of floating mutually, when adapting in the roughing workpiece end face and its axial line out of plumb, pusher dog can stably roll the needs on workpiece end face; The 3rd, the centre-to-centre spacing in pusher dog tooth and top axle center is wanted and can be adjusted, can adapt to the workpiece needs of different-diameter size.

Current known face driver center has two kinds, a kind of is fluid pressure type face driver center (there is model machine in Shandong Machine Tool Parts Factory), another kind is mechanical float formula face driver center (seeing Γ OCT18257-72 standard), their center is top all to be by on the retaining plug screw of a powerful preloading spring axial support in the taper shank hole, to satisfy above-mentioned first designing requirement, their three pusher dogs all are axially slidably, to adapt to the needs of the unsteady balance in above-mentioned second designing requirement.Different is: the rear end face of three pusher dogs of fluid pressure type face driver center, hydraulic oil supporting by communicating with each other in the external blind bore chamber, use hydraulic principle, keep three pusher dog axial float balances, not only sensitivity but also steady, shortcoming is: because a large amount of heat in metal cuttings that roughing produces make the hurried decline of oil viscosity, and pusher dog is when penetrating workpiece, axial compressive force is very big, and the sectional area of pusher dog own is limited again, so oil pressure is considerable in the chamber, seal request to the pusher dog sliding surface is high, Gu and strict to material therefor and parts machining process, the cost height, the life-span is low.Three rear end faces of dialling melon of mechanical float formula face driver center withstand on the end face of a ball ring, the sphere of ball ring then abuts against on the taper hole face of taper shank center, because during unbalance stress, taper hole produces inclination flip to spherical surface body relatively everywhere, up to stressed even till, thereby also can keep three pusher dog axial float balances preferably, and simple in structure, not influenced by heat in metal cutting, less demanding to part processing precision, cost is low, and the life-span is long.Here it is to be noted, the way that above-mentioned two kinds of face driver centers solve above-mentioned the 3rd designing requirement is all not ideal enough, the fluid pressure type face driver center is the moving tooth dish of subsidiary a series of different-diameters at random, select the moving tooth dish of different size for use according to the diameter of work size, before withstanding on pusher dog, drive the workpiece revolution, because top front end has added a moving tooth dish, mechanism's axial dimension lengthening, reduced stiffness must influence machining accuracy and cutting data, has reduced work efficiency, also can influence the machine tooling scope, moreover annex is many, the high again one deck of cost, and many annex users do not use, and cause waste.Mechanical float formula face driver center then pusher dog centre-to-centre spacing can not be transferred, and can only adopt the face driver center of different size to adapt to the workpiece of different-diameter size, and cost is also high, and is inconvenient again.

Task of the present utility model is exactly to solve on the basis of mechanical float formula face driver center of first, second designing requirement at above-mentioned energy more satisfactoryly, further improved, a kind of mechanical float formula face driver center of pusher dog adjustable center distance is provided, reasonably satisfy above-mentioned three designing requirements, realize a tractor serves several purposes to be convenient to the user, and reduce manufacturing cost significantly.

Solution is that all-in-one-piece pusher dog branch on the former mechanical float formula face driver center is partly formed by two, promptly by the pusher dog body that has the end face moving tooth and in axial sliding traveller form, the two is along top radially eccentric relatively configuration, be shaped on the axially directed groove of some five equilibriums on the traveller cylindrical circumference, because moving tooth off-centre, three every five equilibriums that rotate synchronously of traveller, the centre-to-centre spacing of moving tooth just changes a retaining, thereby reaches the purpose of pusher dog adjustable center distance.Adjustment amount for further expansion and refinement pusher dog centre-to-centre spacing, preferably making on the pusher dog body end face has only one side of something to be shaped on moving tooth, and also be shaped on some five equilibrium locating slots on its cylindrical circumference, three pusher dog bodies whenever rotate synchronously a five equilibrium relative to traveller, an also fine-tuning retaining centre-to-centre spacing.

Accompanying drawing has provided embodiment of the utility model.Wherein Fig. 1 is the general structure profile, and Fig. 2 is its vertical view.

This is a kind of mechanical float formula face driver center, its housing (5) is connected with taper shank (11) by positioning spigot, top (8) are contained in the centre bore of housing (5) and taper shank (11), and by preloading spring (9), be supported on retaining plug screw (10) end face, make top enough axial drags that has, but and axial float, top for preventing (8) are ejected external when zero load by spring (9), the axially directed groove that available guider screw (7) inserts on top (8) comes spacing.The end face that is distributed on three pusher dogs on the housing (5) withstands on the end face of a spherical surface body (6), and the sphere of spherical surface body (6) abuts against on the center taper hole face of taper shank (11).It improves main points and is, said pusher dog is made up of pusher dog body (1) and traveller (4), the two is along the radially eccentric relatively configuration of housing (5), be shaped on some (being two) axially directed groove of five equilibrium on traveller (4) the cylindrical circumference here, behind three the every rotation synchronously of traveller one five equilibriums, available screw (3) carries out circumferential registration, the double feather key of doing.The above-mentioned further improvement of mentioning is to have only one side of something to be shaped on moving tooth on pusher dog body (1) end face, and also be shaped on some (being two) five equilibrium locating slot on its cylindrical circumference here, three pusher dog bodies (1) are every after traveller (4) rotates a five equilibrium synchronously, available screw (2) locking.So, the centre-to-centre spacing of three pusher dogs can obtain some retaining subcenter carpenters squares cun (present embodiment is 4 retainings) by two kinds of means permutation and combination.

The utility model novel structure, simple, compact, workpiece loading and unloading is time saving and energy saving, easy to use flexible, safe and reliable, the rigidity foot, and assurance higher processing precision, the utmost point is suitable for powerful rough turn and half finish turning operation is used, during test, once with machine tool chief axis 610r/min, cutting depth 7.5mm, 45 steel of the cutting data continuous strong cutting φ 75 * 127 of feed 0.4mm/r are held in both hands 250 in material, all the intact whole excircle dimensions of clamping car of energy, not only the work efficiency height also can alleviate labor strength greatly.In addition, because the utility model is rationally matched spherical surface body size and taper hole tapering, pusher dog axial float amount is big, the method turning taper that can borrow lathe tailstock laterally to adjust, again can be by adjusting the workpiece that pusher dog centre-to-centre spacing adapts to different-diameter, be a tractor serves several purposes, manufacturing cost is significantly less than the fluid pressure type face driver center again, and be blissful sight its development prospect.

Claims (2)

1, a kind of mechanical float formula face driver center, its housing (5) is connected with taper shank (11) by positioning spigot, top (8) are contained in the centre bore of housing (5) and taper shank (11), and be supported on retaining plug screw (10) end face by preloading spring (9), uniform three pusher dog end faces that are contained on the housing (5) withstand on the end face of spherical surface body (6), the sphere of spherical surface body (6) abuts against again on the taper hole face of taper shank (11) center, it is characterized in that: said pusher dog is made up of pusher dog body (1) and traveller (4), the two is shaped on the axially directed groove of some five equilibriums along the radially eccentric relatively configuration of housing (5) on traveller (4) the cylindrical circumference.

2, face driver center according to claim 1 is characterized in that: have only one side of something to be shaped on pusher dog body (1) end face and stir tooth, and be shaped on some five equilibrium locating slots on its cylindrical circumference.

Images