CN203470948U

CN203470948U - Spindle clamp

Info

Publication number: CN203470948U
Application number: CN201320413215.7U
Authority: CN
Inventors: 汤朝武
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-07-03
Filing date: 2013-07-03
Publication date: 2014-03-12
Anticipated expiration: 2023-07-03

Abstract

The utility model discloses a spindle clamp which comprises a rigid spindle, a reset spring, a clamping bolt and a flat gasket and is characterized by further comprising an expandable spindle composed of at least three expandable spindle sheets, tension springs and woodruff keys, wherein the tension springs are used for supplying pulling forces for ensuring the full contact between the expandable spindle and the outer conical surface of the rigid spindle; and the woodruff keys are respectively matched with corresponding positioning slots on the expandable spindle sheets, so as to ensure the circumferential positioning and axial guiding of the expandable spindle. During a clamping process, a workpiece is sleeved on the expandable spindle, and then the rigid spindle is sleeved, the clamping bolt is tightened or loosened, and the expandable spindle can move along the axial direction while generating a radial force under the action of the tension springs, the reset spring and the matching surface taper of the rigid spindle and the expandable spindle, so as to realize the clamping and releasing of the workpiece. The quantity of the tension springs is at least two. The spindle clamp has the advantages that the structure is simple, the operation is convenient, the coaxiality between an inner hole and an outer circle of the parts and the cylindricity of the outer circle can be efficiently ensured and the processing precision and the production efficiency of the parts are increased.

Description

A kind of mandrel fixture

[technical field]

The utility model relates to mechanical manufacturing field, relates in particular to a kind of mandrel fixture.

[background technology]

Between the cylindrical of a lot of jatharapanvartanasana parts and benchmark endoporus, there is higher position accuracy demand, in prior art, conventionally adopt rigidity mandrel fixture (as Fig. 1) or elastic spindle fixture (as Fig. 2 and Fig. 3) to complete the processing of part outer; But this two classes fixture has significant limitation in application: the size adaptability of rigidity axle is poor, it requires the endoporus dimensional accuracy of workpiece higher, otherwise rigidity axle will and different workpieces endoporus between radial fit gap suddenly big or suddenly small, cannot guarantee the requirement of bulk of components to positioning datum precision; And though elastic spindle can adapt to the bulk of components processing that endoporus size fluctuation is larger, but because the radially distending of each point on spring leaf is all to take root (A point as shown in Figure 3) launches as the center of circle, along the radially distending amount of axis direction each point cylindrical, be different.For example, when elastic spindle is moved to the left along axis direction, the radially distending amount of spring leaf from A point to B point successively from small to large, correspondingly, excircle dimension after distending is also from small to large, so the radial clamping power of the actual acquisition of workpiece changes to B point from A point, and increases gradually.For those more yielding parts under external force, as sleeve part, the part manufactured with the larger material of elasticity etc., such clamping is very serious to the negative effect of excircle of workpiece precision.

[summary of the invention]

The problem existing for prior art, the purpose of this utility model be to provide a kind of simple in structure, easy to operate, can effectively guarantee axiality between inner bore of part and cylindrical and the mandrel fixture of cylindrical cylindricity.

The technical solution adopted in the utility model is: a kind of mandrel fixture, comprise rigidity axle, back-moving spring, pinching screw and plain washer, and it is characterized in that: also comprise expanding arbor, extension spring and woodruff key that at least three expanding arbor sheets form; Wherein, extension spring provides pulling force, and assurance expanding arbor fully contacts with rigidity axle male cone (strobilus masculinus); Woodruff key coordinates with locating slot corresponding on expanding arbor sheet respectively, guarantees circumferentially location and axially directed of expanding arbor; During clamping, workpiece is enclosed within on expanding arbor, put again rigidity axle, by tightening or unclamping pinching screw, under the effect of extension spring, back-moving spring and rigidity axle and expanding arbor mating surface tapering, when expanding arbor is mobile vertically, produce radially dynamics, realize the clamping of workpiece and unclamp.

Described extension spring has two at least.

The beneficial effects of the utility model are: simple in structure, easy to operate, can effectively guarantee axiality and cylindrical cylindricity between inner bore of part and cylindrical, improved machining accuracy and the production efficiency of part.

[accompanying drawing explanation]

Below in conjunction with accompanying drawing, the utility model will be further described.

Fig. 1 is rigidity mandrel fixture schematic diagram in prior art;

Fig. 2 is prior art Elastic mandrel fixture schematic diagram;

Fig. 3 is prior art Elastic axle part front view;

Fig. 4 prior art Elastic axle part left view;

Fig. 5 the utility model structural representation;

Fig. 6 the utility model expanding arbor part front view;

Fig. 7 the utility model expanding arbor part left view;

1, rigidity axle 2, workpiece 3, back-moving spring 4, pinching screw 5, plain washer 6, elastic spindle 7, spring leaf 8, expanding arbor 9, extension spring 10, woodruff key 11, expanding arbor sheet 12, locating slot

[specific embodiment]

Referring to accompanying drawing, the utility model is a kind of mandrel fixture, comprises rigidity axle 1, back-moving spring 3, pinching screw 4 and plain washer 5, it is characterized in that: also comprise expanding arbor 8, extension spring 9 and woodruff key 10 that at least three expanding arbor sheets 11 form; Wherein, extension spring 9 provides pulling force, and assurance expanding arbor 8 fully contacts with rigidity axle 1 male cone (strobilus masculinus); Woodruff key 10 coordinates with locating slot 12 corresponding on expanding arbor sheet 11 respectively, guarantees circumferentially location and axially directed of expanding arbor 8; During clamping, workpiece 2 is enclosed within on expanding arbor 8, put again rigidity axle 1, by tightening or unclamping pinching screw 4, under the effect of extension spring 9, back-moving spring 3 and rigidity axle 1 and expanding arbor 8 mating surface taperings, when expanding arbor 8 is mobile vertically, produce radially dynamics, realize the clamping of workpiece 2 and unclamp.

Described extension spring 9 has two at least.

As shown in Figure 5, because being separated from each other completely equal expanding arbor sheet 11 by three, expanding arbor 8 forms, when expanding arbor sheet 11 moves along fixture axis of rotation, the inner conical surface of expanding arbor sheet 11 keeps close contact with rigidity axle 1 male cone (strobilus masculinus) all the time, when expanding arbor sheet 11 is along axis direction to the left or to the right during translation, along diametric(al) do away from or the translation of convergence axis of rotation.Like this, the expanding arbor sheet 11 vertically variation of the radial dimension of each point cylindrical is consistent, and workpiece 2 is basically identical along the axis direction radial clamping power that endoporus obtains everywhere, reduces or avoid causing because of the difference of clamping force the inhomogeneous deformation of workpiece 2.

Plain washer 5 and pinching screw 4 in expanding arbor 8 are parts peculiar.The outer surface that the surface that two planes of plain washer 5, pinching screw 4 contact with plain washer 5 and expanding arbor 8 contact with plain washer 5 is necessary fine finishining all, to guarantee the good contact between them, guarantee that the axial displacement of each expanding arbor sheet 11 in clamping process is synchronous all the time.

1 of expanding arbor sheet 11 and rigidity axle, must guarantee good circumferential location and axially directed, to prevent the variation because of the relative circumferential position of 11 of expanding arbor sheets, produce the drift of cylindrical center of circle relative stiffness axle 1 home position of expanding arbor 8 fixtures, the endoporus home position of the workpiece 2 that makes to be positioned changes thereupon.Locating slot 12 circumferentially with axially directed, coordinates with woodruff key 10 location for expanding arbor sheet 11 as shown in Figure 5.

The material of the vital part expanding arbor sheet 11 in expanding arbor 8 fixtures does not need must adopt the larger material of elasticity as elastic spindle 6.As long as possess in principle the instructions for use that good wearability can meet expanding arbor sheet 11.

The preferred embodiment that this utility model has been described at this, comprises that inventor is for implementing known optimal mode of the present utility model.The change of preferred embodiment is apparent for those of ordinary skills after reading above-mentioned explanation.Inventor wishes the rationally such change of application of those of ordinary skill, and inventor thinks and at this, clearly states different application and also can realize the utility model.Therefore, the utility model comprises all modifications and the equivalents of the purport of quoting in the claim of enclosing, and this allows in applicable law.In addition, any combination of all possible change of above-mentioned key element is also comprised by the utility model, unless pointed out in addition or obvious contradiction in context at this.

Claims

1. a mandrel fixture, comprises rigidity axle, back-moving spring, pinching screw and plain washer, it is characterized in that: also comprise expanding arbor, extension spring and woodruff key that at least three expanding arbor sheets form; Wherein, extension spring provides pulling force, and assurance expanding arbor fully contacts with rigidity axle male cone (strobilus masculinus); Woodruff key coordinates with locating slot corresponding on expanding arbor sheet respectively, guarantees circumferentially location and axially directed of expanding arbor; During clamping, workpiece is enclosed within on expanding arbor, put again rigidity axle, by tightening or unclamping pinching screw, under the effect of extension spring, back-moving spring and rigidity axle and expanding arbor mating surface tapering, when expanding arbor is mobile vertically, produce radially dynamics, realize the clamping of workpiece and unclamp.

2. mandrel fixture as claimed in claim 1, is characterized in that: described extension spring has two at least.